JPH0350362Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention takes into consideration the filling method of the heat absorbing material filled in the heat absorption chamber of a direct contact type hot water heater. The present invention also relates to a direct contact type hot water heater which has substantially the same resistance to combustion gas over the entire cross section and has good thermal efficiency.

[Conventional technology]

Conventionally, a combustion chamber is provided above a hot water storage section provided at the lowest part, an endothermic chamber filled with an endothermic material is provided above the combustion chamber, and a Direct contact with a structure in which the water that is sprinkled and falls onto the heat absorbing material and the combustion gas of the fuel combusted in the combustion chamber are brought into direct contact to obtain hot water at a desired temperature in the hot water storage section at the bottom. The technical philosophy regarding hot water heaters was published in 15983.
No. 39-10965, etc.

Such direct contact type hot water heaters have a structure in which the water to be heated comes into direct contact with the combustion gas as it flows from the heat absorption chamber above the combustion chamber to the hot water storage section below, resulting in extremely high thermal efficiency. Unlike conventional boilers that heat water in a sealed container, it heats water under atmospheric pressure, so it can be easily used at home, and the hot water obtained is free from dissolved water contained in it. It is hot water that has been degassed of oxygen and is good for rust prevention, and it also incorporates carbon gas contained in combustion gas, so when used for bathing, it can be used to recover from fatigue.Ordinary tap water can be heated as is in a bath pot. It has effects that hot water does not have, and its uses are expected to be quite wide.

[Problem that the invention attempts to solve]

However, such a direct contact type hot water heater has an endothermic chamber filled with an endothermic material provided above a combustion chamber provided above a hot water storage section provided at the bottom. Water that falls from above the heat absorption chamber onto the heat absorption material is brought into direct contact with the combustion gas of the fuel combusted in the combustion chamber to obtain hot water at a desired temperature in the hot water storage section at the bottom. Due to the structure, there is a risk that water droplets may fall from the heat absorption chamber into the combustion chamber and the burner may be wetted by the water droplets. There was a problem in that special consideration had to be taken to ensure that the incoming water flowed down along the wall around the combustion chamber of the heater body.

As a means to solve these problems, the inventors of the present invention removed the partition plate that partitions the heat absorption chamber and the combustion chamber and holds the filler filled in the heat absorption chamber from above. If we use a conical perforated plate that guides the sprinkled water to the outer circumferential surface of the direct contact type hot water heater while forming a water film on both the upper and lower surfaces, the effect of this water film will allow the sprayed water to reach the combustion chamber. It was discovered that the water could flow down along the wall around the heater body instead of falling directly, and a patent application was made earlier.
A direct contact type hot water heater according to No. 61-17760 (see Japanese Patent Application Laid-open No. 62-276363) was proposed. The water sprayed from above on the partition plate that partitions the heat absorption chamber and the combustion chamber and holds the filler filled in the heat absorption chamber is directly applied while forming a water film on both the top and bottom surfaces of the partition plate. By using a conical perforated plate that is guided to the wall around the contact type hot water heater, the water sprinkled into the heat absorption chamber can flow down along the wall around the heater body instead of falling directly into the combustion chamber. However, since the dividing plate that separates the endothermic chamber from the combustion chamber and holds the filler filled in the endothermic chamber is a conical perforated plate, the filling that is filled in the endothermic chamber is The thickness of the material is different between the area directly above the top of the conical perforated plate and the area directly above the periphery, and as a result, the thinner part of the filling material provides resistance to water flowing down from above and combustion gas flowing from below. Since the water is small, only the water flowing in that part becomes high temperature, and the thick part of the filling material has a large resistance to the water flowing down from above and the combustion gas flowing from below, so the water flowing in that part becomes high temperature. There was a problem in that it still flowed down at a low temperature, which was still unfavorable in terms of thermal efficiency.

[Means for solving problems]

As a result of intensive research to further improve the thermal efficiency of such direct contact hot water heaters, the inventors of the present invention first published Japanese Patent Application No. 61-17760 (Japanese Unexamined Patent Publication No. 62-17760).
See Publication No. 276363. ), the partition plate that separates the heat absorption chamber and the combustion chamber and holds the filler filled in the heat absorption chamber is sprayed with water from above to form a water film on both the top and bottom surfaces. The conditions that the conical perforated plate is used to guide the surrounding wall surface of the direct contact type hot water heater while forming the heat absorbing chamber and the upper surface of the filler filled in the heat absorption chamber are kept at almost the same height are not changed. In order to solve the above problem, the heat absorption chamber is filled with two or more types of fillers with different resistances to the fluid, and the two or more types of fillers are adjusted vertically to fill the heat absorption chamber. We discovered that even if the thickness of the filling material is different between the top of the conical perforated plate and the surrounding area, the vertical resistance inside the heat absorption chamber can be made almost the same over the entire cross-sectional area, and the present invention was developed. It was completed.

That is, the present invention includes a combustion chamber provided above the hot water storage section provided at the lowest part, and a conical perforated plate that is attached above the combustion chamber and guides water sprinkled from above to the outer peripheral surface. An endothermic chamber filled with an endothermic material is provided above the endothermic chamber, and the water that is sprinkled onto the endothermic material and falls from above the endothermic chamber and the combustion gas of the fuel combusted in the combustion chamber are collected. In a direct-contact type hot water heater that obtains hot water at a desired temperature in the hot water storage section by direct contact, the heat absorption chamber is divided into upper and lower sections by a net-like body, and each section has a resistance to the fluid. The present invention provides a direct contact type hot water heater characterized in that the heat absorption chamber is filled with different heat absorption materials so that the resistance in the vertical direction within the heat absorption chamber is substantially the same over the entire cross section.

〔Example〕

Hereinafter, the direct contact type hot water heater according to the present invention will be explained in detail.

1 and 2 are illustrative cross-sectional views of embodiments of the direct contact type hot water heater according to the present invention, respectively.

In the drawings, 1 is a heater main body, and 2 is a hot water storage section provided at the lowest part of the heater main body 1. Reference numeral 3 denotes a combustion chamber provided above the hot water storage section 2, and a burner 4 is attached to the combustion chamber 3 either sideways or upwardly on the side wall as shown in FIG. 1 or on the bottom as shown in FIG. The fuel supplied to the burner 4 is combusted in the combustion chamber 3, and the combustion gas is discharged from the upper part of the heater body 1. Reference numeral 5 denotes an endothermic chamber provided above the combustion chamber 3, in which an endothermic material is placed on a conical perforated plate 6 which is installed above the combustion chamber 3 and guides water sprayed from above to the outer peripheral surface. The inside of this heat-absorbing chamber 5 is divided into upper and lower parts by a mesh body 5a, and the heat-absorbing materials 7 filled in each of the divided parts have different resistances to the fluid, so they do not absorb heat. The resistance to fluid in the vertical direction within the chamber 5 is approximately the same throughout the cross section. 8 is a water supply nozzle installed above the heat absorbing material 7 of the heat absorbing chamber 5 and sprays water to be heated onto the heat absorbing material 7; 9 is a water supply nozzle installed above the heat absorbing chamber 5 of the heater body 1 and serving as a combustion chamber. This is an exhaust stack from which the combustion gas that is combusted in step 3 and heats water in the endothermic chamber 5 is discharged. Reference numeral 10 denotes a hot water outlet for supplying hot water stored in the hot water storage section 2 to hot water usage locations. Reference numeral 11 denotes a film of hot water flowing down along the side wall of the combustion chamber 3 from the outer peripheral surface of the conical perforated plate 6 at the lower part of the heat absorption chamber 5.

[Effect]

In order to use the direct contact type hot water heater according to the present invention having such a structure, fuel is supplied from the burner 4 to the combustion chamber 3 for combustion, and at the same time, the water supply nozzle 8 is supplied to the heat absorption chamber 5 on the conical perforated plate 6. When water is sprinkled on the heat absorbing material 7, the combustion gas is discharged from the combustion chamber 3 through the heat absorbing chamber 5 and from the upper exhaust pipe 9, and the sprayed water flows through the heat absorbing material 7 onto the slope of the conical perforated plate 6. By the time it flows down, it is heated by the combustion gas,
Next, the process of flowing down along the conical perforated plate 6 to the periphery of the conical perforated plate 6, the process of flowing down as a water film 11 of hot water along the peripheral side wall of the combustion chamber 3, and then the first process.
As shown in the figure, if there is no shielding plate separating the hot water storage section 2 and the combustion chamber 3, the hot water stored in the hot water storage section 2 is heated from its upper surface and becomes hot water at a desired temperature.

In the process of heating hot water, the heat absorbing material 7 filled in the heat absorbing chamber 5 has different resistance to the fluid in the upper and lower portions of the mesh body 5a, and as a result, the heat absorbing material 7 filled in the heat absorbing chamber 5 has different resistance to the fluid. Since the resistance to the fluid in the vertical direction of The time it takes to reach the upper surface of combustion chamber 3 is almost the same, and
The combustion gas that is combusted in the heat absorption chamber 5 and moves upward also takes approximately the same amount of time to reach the upper surface of the heat absorption material 7 from the conical perforated plate 6.
After that, the conical perforated plate 6 is shaped into a conical shape such as a cone or a pyramid with an inclination angle of 10 to 60 degrees with respect to the horizontal as shown in the figure, and the perforated holes are rounded. By forming the hole so that the water flowing down from above flows down sequentially along the periphery of the hole, the water sprayed from the water supply nozzle 8 onto the heat-absorbing material 7 in the heat-absorbing chamber 5 absorbs heat. After flowing down through the material 7, the hot water flows down along the conical perforated plate 6 and flows down from around the conical perforated plate 6 along the side wall of the combustion chamber 3 as a film 11 of hot water, and flows down into the hot water storage section 2. Hot water is stored.

〔effect〕

The direct contact type hot water heater according to the present invention as described in detail above is installed above the combustion chamber 3 to prevent water droplets from falling into the combustion chamber 3, and guides water sprinkled from above to the outer peripheral surface. The heat-absorbing material 7 filled and supported on the conical porous plate 6 is divided into upper and lower sections by a mesh body 5a that provides almost no resistance to water flowing down from above and combustion gas rising from below. The heat-absorbing materials 7 filled in the areas divided by the net-like body 5a have different resistances to the fluid, and as a result, the fluid in the vertical direction in the heat-absorbing chamber 5 is Since the resistance to
Since the thermal efficiency of the heat absorbing chamber becomes uniform over the entire cross section of the heat absorption chamber, the overall thermal efficiency is significantly improved, and two or more types of heat absorbing materials 7 having different resistances to the fluid can be prevented by the mesh body 5a. Since the heat absorbing materials 7 having different resistances to the fluid mix over time, the resistance to the fluid becomes uneven over the entire cross section of the heat absorbing chamber 5, and there is no defect in which the thermal efficiency decreases. It has various advantages such as easy filling of the material 7 into the heat absorption chamber 5 in the heater body 1, and is of great practical value.

[Brief explanation of the drawing]

1 and 2 are illustrative cross-sectional views of embodiments of the direct contact type hot water heater according to the present invention, respectively. 1... Heater body, 2... Hot water storage section, 3... Combustion chamber, 4... Burner, 5... Endothermic chamber, 5a...
Net-like body, 6... Conical porous plate, 7... Endothermic material, 8...
...Water supply nozzle, 9...Exhaust pipe, 10...Hot water outlet, 11...Hot water film.

Claims (1)

[Scope of utility model registration request] A combustion chamber 3 is provided above the hot water storage section 2 provided at the lowest part, and a conical perforated plate 6 is installed above the combustion chamber 3 and guides water sprinkled from above to the outer peripheral surface. An endothermic chamber 5 filled with an endothermic material 7 is provided in the endothermic chamber 5, and the water that falls from above the endothermic material 7 and the fuel combusted in the combustion chamber 3 are mixed. In a direct-contact type hot water heater that obtains hot water at a desired temperature in the hot water storage section 2 by directly contacting combustion gas, the inside of the heat absorption chamber 5 is divided into upper and lower sections by a mesh body 5a. A direct contact type hot water heater characterized in that each part is filled with an endothermic material 7 having a different resistance to fluid, so that the resistance in the vertical direction in the endothermic chamber 5 is made almost the same over the entire cross section.