JPH01305262A - Hot water supplying apparatus - Google Patents

Abstract

PURPOSE:To prevent a crack from occurring for a long period of time by so composing a heat insulator provided on a bottom plate as to be brought into close contact with the inside of the lower connection part of an inner body to an outer body. CONSTITUTION:Even if an inner body 1 is heated by the flame of a burner, the body 1, the lower connecting parts 9 of an outer body 2 and a bottom plate 6 are so protected by a heat insulator 7 as not to have a gap. Thus, it is not extremely raised at its temperature, and a water boiler 3 is thermally expanded mainly in normal vertical directions. Therefore, since the boiler 3 is not radially abruptly thermally expanded, even if the inner face of the boiler 3 is glass-lined, the surface of a bent part 2a of the cylinder of the body 2 to a contracted tube is not cracked, no red water is discharged from a hot water supplying apparatus, or no water leakage occurs from the boiler 3.

Description

[Detailed description of the invention] Industrial applications The present invention relates to a water heater used for space heating, hot water supply, etc.

BACKGROUND ART Conventionally, this type of water heater has the following features as shown in FIGS. 3 and 4.
A water can 23 is constructed by fitting the upper and lower ends of a cylindrical inner shell 21 with an expanded upper part and a cylindrical outer shell 22 with a reduced lower part by welding, etc., and an inner shell. It consisted of a burner 24 that penetrated and faced the inside of the inner shell 21, and a combustion chamber 25 inside the inner shell 21. Further, a bottom plate 26 is welded to the lower end of the water can 23.
A heat insulating material 28 was placed on top of the base plate 6, and the heat insulating material 28 was fixed by bending three or four claws 27 welded to the bottom plate 26 as shown in FIG.

Problems to be Solved by the Invention However, in the above configuration, the heat insulating material 28 has a smaller diameter than the bottom plate 26 in order to facilitate the assembly work, and the diameter of the insulating material 28 is smaller depending on how the claws 27 are bent. is often eccentric, and large and small gaps a have been created between the outer periphery of the heat insulating material 28 and the inner shell 21. In particular, if a large gap a occurs on the side opposite to the burner installation side, the burner flame will penetrate into the gap a, causing the inner shell 21 and the outer M2
In addition to directly heating the lower fitting part 29 of 2, the burner flame also penetrated into the gap between the heat insulating material 28 lifted from the bottom plate 26 by the claws 27 and the bottom plate 26. Since the lower fitting part 29 and the bottom plate 26 of the inner shell 21 and outer shell 22 are not in contact with canned water, when exposed to the burner flame, the temperature rises extremely, which causes the lower fitting part 29 of the inner shell 21 and outer shell 22 to Kimibu 29
A force that causes rapid expansion, particularly in the radial direction, acts on the . In addition, since the inner 11R21 and outer shell 22 are attached at the same time by welding at both the upper and lower ends, they are heated by the burner 24.
The inner shell 21 is heated and the outer shell 1142 does not rise above the canned water temperature.
2, thermal stress and thermal strain mainly occur in the -1-down direction. Therefore, the inner shell 21. The thermal strain that occurs in the outer shell 22 is mainly caused by a combination of double-directional thermal strain and rapid thermal expansion, especially in the radial direction, of the lower fitting portions 29 of the inner shell 21 and outer shell 22,
A large thermal strain will occur in the curved portion 22a of the outer shell 22 from the cylindrical portion to the tube contraction portion. In addition, if the inner surface of the water base 23 is glass-lined, a large composite thermal strain will occur each time the water heater is started or stopped, and as a result, cracks will occur on the glass lining surface and the inner surface of the water base 23 will be damaged. The problem was that the rust progressed and red water came out of the water heater, or in the worst case, water leaked.

The present invention solves these conventional problems.

The purpose is to provide a water heater that prevents the occurrence of cracks over a long period of time and does not emit red water.

Means for Solving the Problems In order to solve the above problems, the water heater of the present invention has a structure in which the heat insulating material provided on the bottom plate is in close contact with the inside of the lower fitting portion of the inner shell and the outer shell. It is.

Effect J-With the configuration described above, the burner flame is blocked by the heat insulating material provided tightly inside the lower fitting part and does not touch the lower fitting part and the bottom plate. Rapid thermal expansion in the direction does not occur.

Therefore, cracks do not occur in the curved portions provided on the outer shell.

Example Hereinafter, one embodiment of the present invention will be explained based on the drawings.

FIG. 1 is a sectional view of a water heater according to an embodiment of the present invention, and FIG. 2 is an enlarged sectional view of a main part of the water heater. In Figure 1, 1
The inner shell 52 has a cylindrical shape with an enlarged upper part, and the outer shell has a cylindrical shape with a contracted lower part.The inner shell 1 and the outer shell 2 are fitted together at their upper and lower ends by welding or the like. A water mother 3 is constructed. Further, numeral 4 denotes a burner which passes through both the inner and outer shells and faces the combustion chamber 5 in the lower part of the inner shell, which heats the inner shell 1.

The lower surface of the water base 3 is sealed by a bottom plate 6. As shown in FIG. 2, a heat insulating material 7 is placed on the bottom plate 6, and this heat insulating material 7 is connected to the inner shell 1 and the outer shell 2 by a plurality of claws 8 welded to the inner surface of the inner shell 1. It is positioned and held so as to be in complete contact with the lower fitting part 9 of the. 10 is a baffle plate provided so that the burner flame flows evenly along the inner shell; 11 is a water inlet; 12 is a hot water outlet; 1 and 13 are exhaust chimneys.

In the following configuration, even if the inner shell 1 is heated by the burner flame, the lower fitting part 9 of the inner shell 1 and the outer shell 2 and the bottom plate 6
Since it is protected by the heat insulating material 7 without any gaps, there is no extreme temperature rise, and the water mother 3 only undergoes the normal thermal expansion mainly in the downward direction.

Therefore, since rapid thermal expansion in the radial direction does not occur in the water body 3, even if the inner surface of the water body 3 is treated with class lining, the bending from the cylindrical part of the outer shell 2 to the contracted pipe part will not occur. No cracks occur on the surface of the portion 2a, no J3 red water comes out from the water heater, and no water leaks from the water base 3.

Effects of the Invention As is clear from the description of the embodiments below, the water heater of the present invention provides the following effects. Even if the inner shell is heated by the burner flame, the lower fitting parts of the inner and outer shells are protected without any gaps by the insulation material, so there will be no extreme temperature rise in both the fitting part and the bottom plate. do not have. Therefore, since the lower fitting part is not expanded suddenly in the radial direction, cracks will not occur in this constricted part, and even if the water heater is used for a long time, it will not cause red water or water in the water tank. There is no need to worry about leakage.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of a water heater according to an embodiment of the present invention, Fig. 2 is an enlarged sectional view of the main parts of the lower fitting parts of the inner and outer shells of the same water heater, and Fig. 3 is a sectional view of a conventional water heater. , FIG. 4 is an enlarged sectional view of the main part of the lower fitting portion of the inner and outer shells of a conventional water heater. ]...Inner shell, 2...Outer shell, 3...Water mother, 4...
Burner, 5... Combustion chamber, 6... Bottom plate, 7... Insulating material, 8... Claw, 9... Lower fitting part. Agent Yoshihiro MorimotoFigure 2

Claims (1)

[Claims] 1. A water can constructed by fitting the upper and lower ends of a cylindrical inner body and a cylindrical outer body, a bottom plate that closes the lower part of the water can, and a water can that penetrates both bodies. A water heater comprising: a burner that faces the inside of the inner shell; and a heat insulating material that is provided on the bottom plate and is in close contact with the inside of a lower fitting part of the inner shell and the outer shell.