JP2023074893A - Combustion chamber, boiler, and water heater - Google Patents

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

The present invention relates to combustion chambers, boilers and water heaters.

Boilers and water heaters are used as devices for supplying steam and hot water using fuel such as petroleum.

Boilers and water heaters generate steam and hot water from water by burning fuel in a combustion chamber and transferring the combustion heat to water through water pipes arranged in the combustion chamber for heat exchange.

Since the combustion chamber reaches a high temperature, it is usually protected by a refractory or a heat insulating material from the viewpoint of protecting the surrounding equipment from heat damage and reducing energy loss (for example, Patent Document 1 and Patent Document 2 ).

In particular, in the combustion chamber, which becomes hot due to the combustion gas, generally, a fluid containing a heat-resistant material is poured onto the surface of the installation object and solidified as a refractory or heat insulating material. Such materials are also called castable materials.

The castable material installed on the ceiling side of the combustion chamber may fall due to its weight, so it is sometimes fixed to the combustion chamber using a fixing jig or the like. The fixing jig used at this time is generally made of metal that can withstand the combustion gas generated in the combustion chamber.

Japanese Patent No. 4946594 Japanese Patent No. 4640705

However, if the metal jig is repeatedly exposed to the combustion gas, corrosion progresses, and there is a problem that maintenance such as replacement and repair of the jig becomes difficult.

The present invention is an invention made to solve the above problems, and an object of the present invention is to provide a combustion chamber that can suppress corrosion of a jig for fixing a heat insulating material and has good maintainability. be.

That is, the combustion chamber of the present invention comprises: a metal container; a plate-shaped heat insulating material containing inorganic fibers arranged so as to be in contact with the inner wall surface of the metal container; A combustion chamber having a rod-shaped member and a fixing member for fixing, wherein the plate-shaped heat insulating material has a bottom surface on the metal container side and is provided along the thickness direction of the plate-shaped heat insulating material. A through hole is formed in the bottom surface of the bottomed hole through which the rod-shaped member passes, and one end of the rod-shaped member is attached to the metal container arranged inside the bottomed hole. The fixing member is fixed and the other end is fixed to the fixing member, and the fixing member has a shape that cannot pass through the through hole on a plane perpendicular to the longitudinal direction of the rod-shaped member, and the bottomed hole is covered with a heat-resistant material.

The combustion chamber of the present invention comprises a rod-shaped member and a fixing member for fixing the plate-shaped heat insulating material to the inner wall surface of the metal container. The rod-shaped member passes through the bottom surface of the bottomed hole of the plate-shaped heat insulating material, one end is fixed to the metal container, and the other end is fixed to a fixing member arranged inside the bottomed hole. Therefore, in the combustion chamber of the present invention, the metal container and the fixed member are arranged to face each other via the plate-shaped heat insulating material by the rod-shaped member.
The shape of the fixing member in the direction perpendicular to the longitudinal direction of the rod-like member is such that it cannot pass through the through hole. Therefore, the plate-like heat insulating material can be fixed to the inner wall surface of the metal container by the fixing member arranged inside the bottomed hole of the plate-like heat insulating material.
Since the opening of the bottomed hole is covered with a heat-resistant material, the fixing member arranged inside the bottomed hole and the rod-shaped member fixed to the fixing member are protected from combustion gas, etc. generated inside the metal container. Corrosion due to impact can be suppressed. Therefore, maintainability is improved.

In the combustion chamber of the present invention, the opening of the bottomed hole is preferably filled with the heat-resistant material.
When the opening of the bottomed hole is filled with a heat-resistant material, it is possible to further suppress the intrusion of the combustion gas generated inside the metal container into the inside of the bottomed hole.

In the combustion chamber of the present invention, the bottom area of the bottomed hole is larger than the opening area of the bottomed hole, and the heat-resistant material is filled from the opening of the bottomed hole to the bottom surface. preferable.
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, so that the heat-resistant material can be suppressed from falling out of the bottomed hole, and the rod-shaped Corrosion resistance of the member and fixing member can be improved.

In the combustion chamber of the present invention, the heat resistant material is preferably the first amorphous material containing an inorganic material.
If the heat-resistant material is the first amorphous material containing an inorganic material, it is suitable as a material for protecting the rod-shaped member and the fixed member from combustion gas and the like. In addition, since the first amorphous material containing an inorganic material can be easily filled into the bottomed holes, workability can be improved.

In the combustion chamber of the present invention, a helical groove is formed on the surface of the rod-shaped member, and the rod-shaped member and the fixing member are screwed together so that the rod-shaped member is fixed to the fixing member. preferably.
With the above configuration, it is easy to fix the rod-shaped member and the fixing member. In addition, since it is easy to release the fixing, it becomes easy to remove the plate-shaped heat insulating material for inspection, replace the plate-shaped heat insulating material, and the like, and maintainability is excellent.

In the combustion chamber of the present invention, the rod-shaped member has a protruding portion in which the tip of the rod-shaped member protrudes further inside the metal container than the fixed member, and the protruding portion extends into the bottomed hole. It is preferably covered with the heat-resistant material filled.
With the above configuration, it is possible to prevent the heat-resistant material covering the protruding portion from falling off from the bottomed hole due to the heat-resistant material being caught.

In the combustion chamber of the present invention, the plate-like heat insulating material is preferably a plate-like paper product.
The plate-like paper-made body is a paper-made body obtained by attaching a binder to inorganic fibers in a slurry liquid and making paper so that the unevenness of the inorganic fibers is reduced. Such a plate-shaped paper product has a property that the inorganic fibers are less uneven and is less likely to deform, so that it is suitable as a plate-shaped heat insulating material to be arranged inside the combustion chamber.

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

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 plate-like molded body in which the inorganic fibers are laminated with little unevenness is obtained, and bulk density and heat insulating properties are stabilized.

In the combustion chamber of the present invention, the plate-shaped heat insulating material preferably has a bulk density of 0.2 to 0.6 g/cm ³ .
When the bulk density of the plate-shaped heat insulating material is within the above range, it is possible to suppress an increase in the weight of the combustion chamber as compared with a refractory material or a heat insulating material using an unshaped product.

In the combustion chamber of the present invention, it is preferable that a concave portion is provided on the surface of the plate-shaped heat insulating material on the metal container side.
If the recess is provided on the surface of the plate-like heat insulating material on the side of the metal container, the recess functions as an air layer and can improve heat insulation.

In the combustion chamber of the present invention, it is preferable that grooves are provided on the surface of the plate-shaped heat insulating material opposite to the surface on the metal container side.
If grooves are provided on the surface of the plate-like heat insulating material opposite to the surface of the metal container, the plate-like heat insulating material cracks due to thermal contraction on the surface of the plate-like heat insulating material on the side of the combustion chamber where heat is particularly likely to be applied. can be suppressed.

The combustion chamber of the present invention has a plurality of the rod-shaped members, the plate-shaped heat insulating material has a plurality of the bottomed holes, and the through-holes of the bottom surfaces of the bottomed holes have the rod-shaped members. It is preferable that the plate-like heat insulating 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-like members.
With the above configuration, one plate-shaped heat insulating material can be fixed by a plurality of sets of rod-shaped members and fixing members, so that the fixing stability of the plate-shaped heat insulating material is improved.

In the combustion chamber of the present invention, the plurality of rod-shaped members are provided, the plate-shaped heat insulating material is an aggregate of a plurality of heat insulating elements containing the inorganic fibers, and each of the heat insulating elements is on the metal container side. has a bottom surface, and has bottomed holes provided along the thickness direction of the plate-shaped heat insulating material, each of the bottomed holes has a through-hole through which the rod-shaped member penetrates, and each of the above The rod-shaped member penetrates through the through-hole in the bottom surface of the bottomed hole, and each of the heat insulating elements is secured to the metal container by each of the fixing members fixed to the other end of each of the rod-shaped members. preferably fixed to the inner wall surface of the
With the above configuration, each heat insulating element constituting the plate-like heat insulating material can be fixed to the inner wall surface of the metal container by a set of the rod-like member and the fixing member.

In the combustion chamber of the present invention, it is preferable that the plurality of heat insulating elements are in contact with each other without gaps along the surface direction of the plate heat insulating material.
If the two heat insulating elements facing each other in the plane direction are in contact with each other without a gap, the heat insulating properties of the plate-like heat insulating material can be enhanced.

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

In the combustion chamber of the present invention, the plate-shaped heat insulating material is arranged on the top surface or the bottom surface of the metal container,
A third amorphous material containing an inorganic material is preferably filled between the side surface of the plate-shaped heat insulating material and the inner side surface of the metal container.
In some cases, it is difficult to perfectly adjust the dimensions of the metal container and the plate-like heat insulating material so that no gap is formed between them. Even in such a case, if the third amorphous material is filled between the side surface of the plate-shaped heat insulating material and the inner surface of the metal container as described above, the deterioration of the heat insulating performance is suppressed. can do.

A boiler of the present invention is characterized by comprising the combustion chamber of the present invention.

Since the boiler of the present invention includes the combustion chamber of the present invention, it is possible to suppress corrosion of the jig for fixing the heat insulating material, and the maintainability is good.

A water heater of the present invention is characterized by comprising the combustion chamber of the present invention.

Since the water heater of the present invention includes the combustion chamber of the present invention, it is possible to suppress corrosion of the jig for fixing the heat insulating material, and maintainability is good.

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

(Detailed description of the invention)
[Combustion chamber]
First, the combustion chamber of the present invention will be explained.
The combustion chamber of the present invention comprises a metal container, a plate-shaped heat insulating material containing inorganic fibers disposed so as to be in contact with the inner wall surface of the metal container, and the plate-like heat insulating material fixed to the inner wall surface of the metal container. A combustion chamber having a rod-shaped member and a fixed member for A through-hole through which the rod-shaped member passes is formed in the bottom surface of the bottomed hole, and one end of the rod-shaped member is fixed to the metal container arranged inside the bottomed hole The other end is fixed to the fixing member, and the fixing member has a shape that cannot pass through the through hole on a plane perpendicular to the longitudinal direction of the rod-shaped member, and the opening of the bottomed hole is covered with a heat-resistant material.

The combustion chamber of the present invention comprises a rod-shaped member and a fixing member for fixing the plate-shaped heat insulating material to the inner wall surface of the metal container. The rod-shaped member passes through the bottom surface of the bottomed hole of the plate-shaped heat insulating material, one end is fixed to the metal container, and the other end is fixed to a fixing member arranged inside the bottomed hole. Therefore, in the combustion chamber of the present invention, the metal container and the fixed member are arranged to face each other via the plate-shaped heat insulating material by the rod-shaped member.
The shape of the fixing member in the direction perpendicular to the longitudinal direction of the rod-like member is such that it cannot pass through the through hole. Therefore, the plate-like heat insulating material can be fixed to the inner wall surface of the metal container by the fixing member arranged inside the bottomed hole of the plate-like heat insulating material.
Since the opening of the bottomed hole is covered with a heat-resistant material, the fixing member arranged inside the bottomed hole and the rod-shaped member fixed to the fixing member are protected from combustion gas, etc. generated inside the metal container. Corrosion due to impact can be suppressed. Therefore, maintainability is improved.

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

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

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

As shown in FIGS. 2 and 3, the plate-shaped heat insulating material 10 connects the first main surface 10a and the second main surface 10b, which have relatively large areas, and the first main surface 10a and the second main surface 10b. It has a plate-like shape with a side surface 10c. The plate-shaped heat insulating material 10 is further provided with bottomed holes 13 that open to the first main surface 10a, and through holes 16 that connect the bottoms of the bottomed holes and the second main surface 10b.

The reason why 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 will be described with reference to FIGS. 4, 5, 6 and 7. FIG.

FIG. 4 is a cross-sectional view schematically showing an example of the process of fixing one end of the rod-shaped member to the inner wall surface of the metal container. FIG. 5 is a cross-sectional view schematically showing an example of the process of arranging the plate-shaped heat insulating material on the inner wall surface of the metal container. FIG. 6 is a cross-sectional view schematically showing an example of the process of fixing the fixing member to the other end of the rod-shaped member. FIG. 7 is a cross-sectional view schematically showing an example of the process of covering the openings of the bottomed holes of the plate-like paper product with a heat-resistant material.

First, as shown in FIG. 4, one end 20a of the rod-shaped member 20 is fixed to the top surface 50a of the metal container 50. Then, as shown in FIG.

Subsequently, as shown in FIG. 5, the rod-shaped member 20 is passed through the through hole 16 provided in the bottom surface 13b of the bottomed hole of the plate-shaped heat insulating material 10, and the plate-shaped heat insulating material 10 is the inner wall surface of the metal container 50. Arranged on the top surface 50a. At this time, the bottom surface 13b of the bottomed hole 13 provided in the plate-shaped heat insulating material 10 is arranged on the metal container 50 side.

At this time, the plate-shaped heat insulating material 10 is only in contact with the top surface 50 a of the metal container 50 . Therefore, the plate-like heat insulating material 10 falls off from the top surface 50a of the metal container 50 unless the worker holds the plate-like heat insulating material 10 with a hand, a jig, or the like.

Subsequently, as shown in FIG. 6, the other end 20b of the rod-shaped member 20 is fixed to the fixing member 30 arranged in the bottomed hole 13. As shown in FIG.
Here, in a plane perpendicular to the longitudinal direction of the rod-shaped member 20 , the fixing member 30 has a shape that cannot pass through the through hole 16 . Therefore, by fixing one end 20a of the rod-shaped member 20 to the top surface 50a of the metal container 50 and fixing the other end 20b of the rod-shaped member to the fixing member 30, the plate-shaped heat insulating material 10 are fixed by being sandwiched between the metal container 50 fixed to both ends of the rod-shaped member 20 and the fixing member 30 . At this point, the plate-like heat insulating material 10 is fixed to the top surface 50a of the metal container 50 even if the worker does not hold the plate-like heat insulating material 10 with a hand or a jig.

Finally, as shown in FIG. 7, by covering the opening 13a of the bottomed hole 13 of the plate-shaped heat insulating material 10 with a heat-resistant material 40, the bottomed hole 13 in which the rod-shaped member 20 and the fixing member 30 are arranged is separated from the combustion chamber. Therefore, the rod-shaped member 20 and the fixed member 30 can be prevented from being corroded by combustion gas or the like generated inside the metal container 50 .

Through the above steps, the plate-shaped heat insulating material can be fixed to the inner wall surface of the metal container by the rod-shaped member and the fixing member. Furthermore, it is possible to suppress corrosion of the rod-shaped member and the fixing member due to the influence of the combustion gas generated inside the metal container, and the maintainability is improved.

The step of fixing the plate-shaped heat insulating material to the inner wall surface of the metal container may be performed in any order as long as the plate-shaped heat insulating material is finally fixed to the inner wall surface of the metal container by the rod-shaped member and the fixing member. 4 to 6 are not restrictive.
For example, first, a plate-shaped heat insulating material is placed on the inner wall surface of the metal container, then a rod-shaped member is passed through the through hole of the plate-shaped heat insulating material, and one end of the rod-shaped member is fixed to the inner wall surface of the metal container. Finally, the plate-like heat insulating material can be fixed to the inner wall surface of the metal container by the rod-like member and the fixing member.

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

The plate-shaped heat insulating material may be a molded body formed by solidifying an amorphous material, a paper-made body, or a needle body. Further, it may be a plate-like molded body, a plate-like paper product, or a plate-like needle body.
A molded product obtained by solidifying an amorphous material is a product obtained by pouring an amorphous material containing an inorganic material into a molding die, solidifying it, and drying and molding it. It is hardened, dried and molded.
A paper-made product is a molded product obtained by pouring a slurry containing inorganic fibers into a mold, sucking and dehydrating the slurry, and drying (paper-making method). It is a paper product.
The needle body is a molded body obtained by subjecting an inorganic fiber assembly to needling treatment, and the plate-like needle body is a plate-like needle body obtained by performing needling treatment.

Among these, the plate-shaped heat insulating material is preferably a sheet-shaped body, and more preferably a plate-shaped sheet-shaped body.
Since the plate-like paper product has a characteristic that the inorganic fibers are not unevenly distributed and is difficult to deform, it is suitable as a plate-like heat insulating material to be arranged inside the combustion chamber.

Although the average fiber diameter of the inorganic fibers is not particularly limited, it is preferably 2.0 to 15.0 μm when the plate-like heat insulating material is made of paper.
When the plate-like 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 less unevenness in density can be obtained.

Although the average fiber length of the inorganic fibers is not particularly limited, it is preferably 0.05 to 3.0 mm when the plate-shaped heat insulating material is made of paper.
When the plate-like heat insulating material is a paper product, if the average fiber length of the inorganic fibers is within the above range, a plate-like molded product in which the inorganic fibers are laminated with little unevenness is obtained, and bulk density and heat insulating properties are stabilized.

Although the bulk density of the plate-like heat insulating material is not particularly limited, it is preferably 0.2 to 0.6 g/cm ³ when the plate-like heat insulating material is made of paper.
When the bulk density of the plate-shaped heat insulating material is within the above range, it is possible to suppress an increase in the weight of the combustion chamber as compared with the refractory material and the heat insulating material made of an amorphous material.

The bulk density is adjusted, for example, by adjusting the amount of water contained in the amorphous material before drying and solidification in the case of a molded article of an amorphous material containing inorganic fibers, or by adjusting the amount of water contained in the amorphous material before drying and solidifying, and in the case of a paper product, during slurry dehydration. In the case of a needle body, it can be carried out by adjusting the needle density and the number of times of the needling treatment.

The bulk density of the molded body obtained by drying and solidifying the amorphous material containing inorganic fibers is usually about 0.7 to 1.5 g/cm ³ , and the preferred bulk of the plate-shaped heat insulating material described above is do not meet density. Also, the bulk density of the needle body is usually about 0.07 to 0.18 g/cm ³ . Therefore, from the viewpoint of adjusting the bulk density of the plate-like heat insulating material to a suitable range, the plate-like heat insulating material is preferably a paper-made body or a needle body, and more preferably a paper-made body.

The thickness of the plate-shaped heat insulating material is preferably 1 to 10 cm.
Sufficient heat insulation can be exhibited as the thickness of the plate-shaped heat insulating material is within the above range.

The volume of the plate-shaped heat insulating material is preferably 700 to 150,000 cm ³ . When the volume of the plate-shaped heat insulating material is within the above range, breakage due to heat shrinkage is particularly difficult to occur.
Note that the volume of the plate-shaped heat insulating material includes the volume of bottomed holes and through holes, as well as the volumes of second through holes, recesses, and grooves, which will be described later.

The plate-shaped heat insulating material may be provided with a second through hole penetrating in the thickness direction.
By forming such a hole, it becomes easy 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 does not overlap the bottomed hole in plan view, unlike the through-hole provided at the bottom of the bottomed hole (also referred to as the first through-hole for distinction). Therefore, the second through-hole may overlap with the recess or groove in plan view.
Further, the through-hole (first through-hole) provided at the bottom of the bottomed hole and the second through-hole are distinguished by whether or not one end thereof is connected to the bottomed hole. A through hole whose one end is connected to the bottomed hole is the first through hole, and a through hole whose both ends are not connected to the bottomed hole is the second through hole.

The plate-shaped heat insulating material may contain components other than inorganic fibers.
Examples of components other than inorganic fibers include inorganic particles, inorganic binders, organic binders, and aggregating agents.

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, fumed silica and the like.
Examples of organic binders include polyvinyl alcohol, starch, acrylic resin, polyacrylamide, and the like.

The weight ratio of the inorganic fibers in the plate-shaped heat insulating material is preferably 30 to 97% by weight.

A concave portion or a groove may be provided on the surface of the plate-shaped heat insulating material.
In this specification, the recesses and grooves refer to the length in the depth direction (hereinafter referred to as depth dimension) and the length in the width direction (hereinafter referred to as width dimension). Specifically, a width/depth ratio of 5 or more is defined as a recess, and a ratio of less than 5 is defined as a groove.

FIG. 8 is a perspective view schematically showing another example of the plate-shaped heat insulating material used in the combustion chamber of the present invention.
The plate-shaped heat insulating material 10 shown in FIG. 8 has a plate shape having a first main surface 10a and a second main surface 10b having relatively large areas and a side surface 10c connecting the first main surface 10a and the second main surface 10b. Shape.
The plate-shaped heat insulating material 10 is provided with bottomed holes 13 , through holes 16 , and recesses 17 .
The recessed portion 17 is provided on the second main surface 10b of the plate-shaped heat insulating material 10 . The concave portion 17 has an annular shape in plan view, and is provided at a position that does not overlap with the through hole 16 and the bottomed hole 13 in plan view.

The concave portion 17 is preferably provided on the second main surface 10b, which is the surface of the plate-shaped heat insulating material 10 on the metal container side.
When the recesses 17 are provided on the surface of the plate-shaped heat insulating material 10 on the metal container side, the recesses 17 function as an air layer, and the heat insulating performance of the plate-shaped heat insulating material 10 can be improved.

FIG. 9 is a perspective view schematically showing still another example of the plate-shaped heat insulating material used in the combustion chamber of the present invention.
The plate-shaped heat insulating material 10 shown in FIG. 9 has a plate shape having a first main surface 10a and a second main surface 10b having relatively large areas and a side surface 10c connecting the first main surface 10a and the second main surface 10b. Shape.
The plate-shaped heat insulating material 10 is provided with bottomed holes 13 , through holes 16 , and grooves 18 .
A total of four grooves 18 are provided on the first main surface 10 a of the plate-shaped heat insulating material 10 . The planar shape of each groove 18 is a linear shape extending from the side surface 10 c of the plate-shaped heat insulating material 10 toward the center of the plate-shaped heat insulating material 10 . However, the groove 18 does not reach the bottomed hole 13 . If the groove reaches the bottomed hole, combustion gas may enter the bottomed hole through the groove.

The grooves 18 are preferably provided on the first main surface 10a, which is the surface of the plate-shaped heat insulating material 10 opposite to the surface on the metal container side.
If the grooves 18 are provided on the surface of the plate-like heat insulating material 10 opposite to the surface on the side of the metal container, the surface of the plate-like heat insulating material 10 facing the inside of the combustion chamber may crack due to thermal contraction. can be suppressed.

As for the grooves, the width and depth of the grooves may be partially different.
By partially varying the width and depth of the grooves, the stress caused by the difference in the amount of heat applied depending on the portion of the plate-shaped heat insulating material can be alleviated, and the occurrence of cracks can be more effectively suppressed.

The plate-like heat insulating material has a bottom surface on the side of the metal container, and has bottomed holes provided along the thickness direction of the plate-like heat insulating material.
A through hole through which the rod-shaped member passes is formed in the bottom surface of the bottomed hole.

The depth of the bottomed hole is preferably 0.5 to 7 cm.
Also, the depth of the bottomed hole is preferably 30 to 70% of the thickness of the plate-shaped heat insulating material.

The opening area of each bottomed hole is preferably 3 to 50 cm ² .

It is preferable that the bottomed hole is provided at a position that does not overlap with the recessed portion or the groove when the plate-shaped heat insulating material is viewed from the thickness direction.

The bottomed hole and the above-described grooves and recesses are distinguished by whether or not the opening is covered with a heat-resistant material. That is, the bottomed holes are those whose openings are covered with a heat-resistant material, and the grooves or recesses are those whose openings are not covered with a heat-resistant material.

[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. be done. It is also possible to directly cover the rod-shaped member and the fixing member with a heat-resistant material. An inorganic adhesive may be applied to the inside or around it to fix a sheet-like heat-resistant material containing inorganic fibers. For example, the rod-shaped member and the fixed member are covered with a sheet-shaped heat-resistant material containing inorganic fibers, and bound and fixed with a string-shaped material containing inorganic fibers.

As the heat-resistant material, for example, a first amorphous material containing an inorganic material can be used.
If the heat-resistant material is the first amorphous material containing an inorganic material, it is suitable as a material for protecting the rod-shaped member and the fixed member from combustion gas and the like. In addition, since the first amorphous material containing an inorganic material can be easily filled into the bottomed holes, workability can be improved.

Examples of the inorganic material that constitutes the first amorphous material include inorganic fibers, inorganic particles, and inorganic colloidal sol that constitute the plate-shaped heat insulating material.

In the combustion chamber of the present invention, the opening of the bottomed hole may be filled with a heat resistant material.
An example in which the openings of the bottomed holes are filled with a heat-resistant material will be described below as a second embodiment.

[Second embodiment]
FIG. 10 is a cross-sectional view schematically showing an example of a combustion chamber according to the second embodiment of the invention.
In the combustion chamber 2 shown in FIG. 10 , the openings 13 a 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, it is possible to further suppress the combustion gas generated in the metal container 50 from entering the bottomed hole 13 .

In the combustion chamber of the present invention, the bottom area of the bottomed hole is preferably larger than the opening area of the bottomed hole, and the heat-resistant material is preferably filled from the opening to the bottom of the bottomed hole.
Such an example will be described below as a third embodiment.

[Third embodiment]
FIG. 11 is a cross-sectional view schematically showing an example of a combustion chamber according to a third embodiment of the invention.
In the combustion chamber 3 shown in FIG. 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. In the bottomed hole 14 whose bottom area is larger than the opening area, if the heat-resistant material is filled from the opening 14a of the bottomed hole 14 to the bottom surface 14b, the heat-resistant material arranged on the bottom surface 14b side of the bottomed hole 14 The shape of 41 is such that it cannot pass through the opening 14 a of the bottomed hole 14 . Therefore, the heat-resistant material 41 is less likely to drop out of the bottomed hole 14 .

The bottom area of the bottomed hole is preferably 110 to 300% of the opening area.

The plate-shaped heat insulating material having a shape as shown in FIG. 2 plate-shaped heat insulation sheets are prepared, and of the surfaces of the second plate-shaped heat insulation sheet, the one with the larger opening area of the through holes faces the first plate-shaped heat insulation sheet, and the first plate-shaped heat insulation sheet and a second plate-shaped heat insulating sheet are laminated and joined. The first plate-shaped heat insulating sheet and the second plate-shaped heat insulating sheet can be joined by, for example, bonding with a heat-resistant adhesive or stitching with a heat-resistant fiber.

[Rod-shaped member and fixing member]
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.

Examples of the rod-shaped member include metal or ceramic rods, threaded bolts (also referred to as long screw bolts), and the like.
Examples of metals forming the rod-shaped member include iron, copper, steel, stainless steel, Inconel (registered trademark), Hastelloy (registered trademark), and Invar (registered trademark).
Ceramics constituting the rod-shaped member include, for example, alumina, zirconia, carbon, silicon carbide, and silicon nitride.

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 having a groove (female thread) corresponding to the spiral groove provided at one end of the rod-shaped member is previously formed in the inner wall surface of the metal container. good too.

Examples of methods for fixing the other end of the rod-shaped member to the fixing portion include welding, screwing, and gripping.

The fixing member includes, for example, a member that can be screwed into a spiral groove formed on the surface of the other end of the rod-shaped member to fix its position at any position in the longitudinal direction of the rod-shaped member.
In addition, the fixing member has, for example, a through-hole penetrating the rod-shaped member so that it can slide arbitrarily in a specific region from one end to the other end of the rod-shaped member, and an arbitrary By providing a gripping/releasing mechanism that grips and releases the rod-shaped member at the position of , the position of the rod-shaped member can be fixed at an arbitrary position in the longitudinal direction.

As a material constituting the fixing member, the same material as that of the rod-shaped member can be preferably used.
The material forming the fixing member may be the same as or different from the material forming the rod-like member, but from the viewpoint of matching the thermal expansion coefficients, it is preferably the same.

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

One end of a rod-shaped member and a metal container are pre-fixed and integrated, for example, one end of a threaded bolt is fixed to the inner wall surface of the metal container by means of welding or the like. be done.
In this case, for example, the plate-like heat insulating material is arranged on the inner wall surface of the metal container so that the bar-like member passes through the through hole provided in the plate-like heat insulating material, and the fixing member is fixed to the other end of the bar-like member. By doing so, the plate-shaped heat insulating material can be fixed to the inner wall surface of the metal container.

Headed bolts such as hexagon bolts, hexagon socket head bolts and wing bolts (also simply referred to as bolts) are examples of those in which the other end of the rod-shaped member and the fixing member are previously fixed and integrated. . In the headed bolt, the bolt head is a fixing member, and can be considered to be fixed and integrated with the cross-cut bolt, which is a rod-like member, from the beginning.
When the other end of the rod-shaped member and the fixing member are pre-fixed and integrated using a hexagon bolt, for example, after one end of the rod-shaped member is passed through a through-hole of a plate-shaped heat insulating material, the rod-shaped member is By screwing one end of the plate-shaped insulating material into a screw hole provided on the inner wall surface of the metal container and having a spiral groove (female thread) on the inner surface, the plate-shaped heat insulating material is attached to the inner wall surface of the metal container. can be fixed to

FIG. 12 is a perspective view schematically showing another example of the rod-shaped member and the fixing member.
A helical groove 22 (external 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 screwing into a spiral groove (female thread) formed in a metal container (not shown).
The other end 21 b of the rod-shaped member is fixed by screwing it into a spiral groove 32 (female thread) formed on the inner surface of the fixing member 31 .
The bar member 21 is a so-called threaded bolt, and the fixing member 31 is a so-called nut.
With the above configuration, the process of fixing the rod-shaped member 21 and the fixing member 31 is easy. Furthermore, since the fixation can be easily released, inspection by removing the plate-shaped heat insulating material 10, replacement of the plate-shaped heat insulating material 10, and the like are facilitated, and maintainability is excellent.

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. The spiral groove 22 is necessary for screwing the metal container 50 and the fixing member 31 together. It may be formed only in the
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.

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

One end of the rod-shaped member 21 is fixed by screwing with the top surface 50 a of the metal container 50 , and the other end of the rod-shaped member 21 is fixed by screwing with the fixing member 31 .

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. As shown in FIG.
When the rod-like member 21 has the protruding portion 21b1, the heat-resistant material 41 covering the protruding portion 21b1 acts as a catch to prevent the heat-resistant material 41 from falling out of the hole 13 with a bottom.
At this time, as shown in FIG. 13 , if the spiral groove 22 is formed in the projecting portion 21 b 1 , the heat resistant material 41 is more likely to be caught. can be suppressed further.

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

FIG. 14 is a cross-sectional view schematically showing an example of a combustion chamber according to a fifth embodiment of the invention.
The combustion chamber 5 shown in FIG. 14 has a metal container 50 , a plate-shaped heat insulating material 10 arranged on a top surface 50 a that is an inner wall surface of the metal container 50 , a rod-shaped member 21 and a fixing member 31 .
The plate-shaped heat insulating material 10 has two bottomed holes 13 , and each bottomed hole 13 is provided with a rod-shaped member 21 and a fixing member 31 . That is, the plate-shaped heat insulating material 10 is fixed to the top surface 50a of the metal container 50 at two points by two pairs of rod-shaped members 21 and fixing members 31. As shown in FIG.

In the combustion chamber of the present invention, the plate-shaped heat insulating material may be composed of an aggregate of a plurality of heat insulating elements containing inorganic fibers. Each heat insulating element has a bottom surface on the side of the metal container and has a bottomed hole provided along the thickness direction of the plate-shaped heat insulating material, and the rod-shaped member penetrates the bottom surface of each bottomed hole. A through hole is preferably formed. Preferably, each heat insulating element is fixed to the inner wall surface of the metal container by a rod-like member and a fixing member.
An example of such a case will be described below as a sixth embodiment.

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

The heat insulating element bodies 111 and 112 connect the first main surfaces 111a and 112a and the second main surfaces 111b and 112b, which have relatively large areas, respectively, and the first main surfaces 111a and 112a and the second main surfaces 111b and 112b. It has a plate-like shape with side surfaces 111c and 112c.
Each of the heat insulating elements 111 and 112 has a bottomed hole 13 and is fixed to the top surface 50a of the metal container 50 by a rod-shaped member 21 and a fixing member 31, respectively.

The heat insulating element 111 and the heat insulating element 112 are in contact with each other without a gap along the surface direction (xy direction) of the plate-like heat insulating material 110 . That is, one of the side surfaces 111c of the heat insulating element 111 and one of the side surfaces 112c of the heat insulating element 112 are in contact with each other without a gap.
If the two heat insulating elements 111 and 112 facing each other in the plane direction are in contact with each other without a gap, the heat insulating properties of the plate-like heat insulating material 110 can be enhanced.

When the plate-shaped heat insulating material includes a plurality of heat-insulating elements, the plurality of heat-insulating elements may be arranged along the surface direction of the plate-shaped heat insulating material so that gaps are formed therebetween.
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 preferably used.

Each heat insulating element is composed 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 preferably used.
As for materials other than inorganic fibers, materials similar to those of the plate-shaped heat insulating material of the present invention can be suitably used.

The heat insulating element is preferably a plate-like paper product.
The size of the bottomed holes provided in the heat insulating element is also preferably the same size as the bottomed holes provided in the plate-like heat insulating material.

In the combustion chamber of the present invention, the plate-shaped heat insulating material is arranged on the top surface or the bottom surface of the metal container, and between the side surface of the plate-shaped heat insulating material and the inner wall surface of the metal container, a third insulating material containing an inorganic material is provided. It may be filled with an amorphous material.
As the third amorphous material, the same material as the above-described first amorphous material can be preferably used.

The combustion chamber of the present invention can be used in any device comprising a combustion chamber. A device having a combustion chamber includes, for example, a boiler, a water heater, and the like.

[boiler]
A boiler of the present invention is characterized by comprising the combustion chamber of the present invention.
Since the boiler of the present invention includes the combustion chamber of the present invention, it is possible to suppress corrosion of the jig for fixing the heat insulating material, and the maintainability is good.

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

[Seventh Embodiment]
FIG. 16 is a cross-sectional view schematically showing an example of a boiler according to the seventh embodiment of the invention.
The boiler 600 has a combustion chamber 7 and a water tube 80 arranged inside the combustion chamber 7 .
The combustion chamber 7 has a metal container 60 and a plate-shaped heat insulating material 10 arranged on a top surface 60 a of the metal container 60 and a plate-shaped heat insulating material 10 arranged on a bottom surface 60 b. The plate-shaped heat insulating material 10 is fixed to the top surface 60 a of the metal container 60 at two points by two pairs of rod-shaped members 20 and fixing members 30 . The two sets of rod members 20 and fixing members 30 are accommodated in the bottomed holes 13 of the plate-shaped heat insulating material 10 , and the openings of the bottomed holes 13 are covered with a heat-resistant material 40 . The combustion chamber 7 is therefore the combustion chamber of the present invention.
Water is supplied into the water pipe 80 from the lower portion of the combustion chamber 7 , and the water passing through the water pipe 80 is heated within the combustion chamber 7 to become steam and is discharged from the upper portion of the combustion chamber 7 .
The discharged water vapor is used for power generation, heating, cleaning, cooking, drying, disinfection, sterilization, etc., after separation of liquid water and heating as necessary.

[Water heater]
A water heater of the present invention is characterized by comprising the combustion chamber of the present invention.
Since the water heater of the present invention includes the combustion chamber of the present invention, it is possible to suppress corrosion of the jig for fixing the heat insulating material, and maintainability is good.

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

[Eighth Embodiment]
FIG. 17 is a cross-sectional view schematically showing an example of a water heater according to the eighth embodiment of the invention.
The water heater 700 has a combustion chamber 8 and a heat exchanger 90 arranged within the combustion chamber 8 .
The combustion chamber 8 has a metal container 70 , and a plate-shaped heat insulating material 10 arranged on a top surface 70 a of the metal container 70 and a plate-shaped heat insulating material 10 arranged on a bottom surface 70 b. The plate-shaped heat insulating material 10 is fixed to the top surface 70 a of the metal container 70 at two points by two pairs of rod-shaped members 20 and fixing members 30 . The two sets of rod members 20 and fixing members 30 are accommodated in the bottomed holes 13 of the plate-shaped heat insulating material 10 , and the openings of the bottomed holes 13 are covered with a heat-resistant material 40 . The combustion chamber 8 is therefore the combustion chamber of the present invention.
Water flows in the heat exchanger 90 , the water in the heat exchanger 90 is heated in the combustion chamber 8 to become hot water (hot water), and the hot water (hot water) is supplied to the outside of the water heater 700 .

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

1, 2, 3, 4, 5, 6, 7, 8 Combustion chamber 10 Plate heat insulator 10a First main surface 10b of plate heat insulator Second main surface 10c of plate heat insulator Side surface 13 of plate heat insulator , 14 bottomed holes 13a, 14a bottomed hole openings 13b, 14b bottomed hole bottom 16 through hole (first through hole)
17 recess 18 groove 20 bar member 21 bar member (slotted bolt)
20a, 21a one end of the rod-shaped member 20b, 21b the other end of the rod-shaped member 21b1 projection 22 helical groove (external thread)
30 fixing member 31 fixing member (nut)
32 helical groove (internal thread)
40, 41 heat-resistant materials 50, 60, 70 metal containers 50a, 60a, 70a top surfaces 50b, 60b, 70b of metal containers bottom surface 50c of metal containers inner surface 80 of metal containers water pipes 90 heat exchangers 110 plate-shaped heat insulating materials 111 , 112 heat insulating elements 111a, 112a first main surfaces 111b, 112b of heat insulating elements second main surfaces 111c, 112c of heat insulating element side surfaces 600 boiler 700 water heater

Claims (19)

a metal container;
A plate-shaped heat insulating material containing inorganic fibers arranged so as to be in contact with the inner wall surface of the metal container;
A combustion chamber having a rod-shaped member and a fixing member for fixing the plate-shaped heat insulating material to the inner wall surface of the metal container,
The plate-shaped heat insulating material has a bottom surface on the metal container side 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 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 arranged 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 combustion chamber, wherein an opening of the bottomed hole is covered with a heat-resistant material. 2. The combustion chamber of claim 1, wherein said opening of said bottomed bore is filled with said refractory material. The bottom area of the bottomed hole is larger than the opening area of the bottomed hole,
3. The combustion chamber according to claim 1, wherein said heat-resistant material is filled from said opening of said bottomed hole to said bottom surface. The combustion chamber according to any one of claims 1 to 3, wherein said heat resistant material is a first amorphous material containing an inorganic material. A spiral groove is formed on the surface of the rod-shaped member, and the rod-shaped member is fixed to the fixed member by screwing the rod-shaped member and the fixed member. A combustion chamber according to any one of the preceding claims. The rod-shaped member has a protruding portion in which a tip end of the rod-shaped member protrudes further into the metal container than the fixing member,
The combustion chamber according to any one of claims 1 to 5, wherein the protrusion is covered with the heat-resistant material filled in the bottomed hole. The combustion chamber according to any one of claims 1 to 6, wherein the plate-shaped heat insulating material is a plate-shaped paper product. The combustion chamber according to any one of claims 1 to 7, wherein said inorganic fibers include at least one selected from the group consisting of biosoluble fibers, alumina fibers, rock wool and glass fibers. 9. The combustion chamber according to claim 8, wherein said inorganic fibers have an average fiber length of 0.05 to 3.0 mm. The combustion chamber according to any one of claims 1 to 9, wherein the plate-shaped heat insulating material has a bulk density of 0.2 to 0.6 g/ ^cm3 . 11. The combustion chamber according to any one of claims 1 to 10, wherein a concave portion is provided on the surface of the plate-shaped heat insulating material on the metal container side. 12. The combustion chamber according to any one of claims 1 to 11, wherein grooves are provided on a surface of said plate-like heat insulating material opposite to the surface on the side of said metal container. Having a plurality of rod-shaped members,
The plate-shaped heat insulating material has a plurality of the bottomed holes,
The rod-shaped member passes through a through-hole on the bottom surface of each of the bottomed holes,
The combustion according to any one of claims 1 to 12, wherein the plate-shaped heat insulating 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. room. Having a plurality of rod-shaped members,
The plate-shaped heat insulating material is composed of an aggregate of a plurality of heat insulating elements containing the inorganic fibers,
Each of the heat insulating elements has a bottom surface on the side of 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 on the bottom surface of each of the bottomed holes,
13. The heat insulating element according to any one of claims 1 to 12, wherein each said heat insulating element is fixed to the inner wall surface of said metal container by each said fixing member fixed to said other end of each said rod-like member. combustion chamber. 15. The combustion chamber according to claim 14, wherein said plurality of heat insulating elements are in contact with each other without gaps along the planar direction of said plate heat insulating material. The plurality of heat insulating elements are arranged so that gaps are formed along the surface direction of the plate-like heat insulating material, and the gaps are filled with a second amorphous material containing an inorganic material. 15. Combustion chamber according to claim 14. The plate-shaped heat insulating material is arranged on the top surface or the bottom surface of the metal container,
17. The combustion chamber according to any one of claims 1 to 16, wherein a third amorphous material containing an inorganic material is filled between the side surface of said plate-shaped heat insulating material and the inner side surface of said metal container. A boiler comprising the combustion chamber according to any one of claims 1 to 17. A water heater comprising the combustion chamber according to any one of claims 1 to 17.

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