JPH0428977B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a water heater mainly used for consumer use.

FIG. 1 shows a kerosene-burning household water heater that has been commonly used. In the figure, 1 is a water heater main body formed in a cylindrical shape so as to surround a combustion chamber 3 with a hollow part as a heat exchange passageway 2, and 4 is a main body 1 of the water heater.
5 is a water outlet that communicates with the water passageway 2 at the bottom of the water heater body 1, 5 is a hot water outlet that communicates with the water passageway 2 at the top of the water heater body 1, 6 is the combustion chamber floor, and 7 is the water heater body 1 for blowing out the flame into the combustion chamber 3. 8 is a heat insulating material covering the outer periphery of the water heater body 1; 9 is an exhaust port; 10 is for disturbing the flow of combustion exhaust gas from the combustion chamber 3 toward the exhaust port 9; Shows the full size provided for this purpose. However, some lever water heaters are equipped with the above-mentioned buffer 10 so that the heat of the combustion exhaust gas is easily transmitted to the passageway 2 of the water heater body 1, but the temperature of the exhaust gas exiting the exhaust port 9 is At about 500℃, a lot of thermal energy was still wasted in the exhaust gas, and the conventional Batsuful still did not have a sufficient effect.

On the other hand, in a water heater disclosed in JP-A-57-131957, a catalyst body having a plurality of small holes is formed from a heat-resistant inorganic material, and two catalyst bodies are arranged in series in a combustion gas passage. In addition, a water passage such as a heat exchange pipe is provided between the two catalyst bodies and immediately after the catalyst body located at the rear of the catalyst body, thereby achieving complete combustion and improving thermal efficiency. However, even in a water heater with such a devised arrangement of catalyst bodies, the thermal efficiency is still insufficient because the thermal energy radiated from the catalyst bodies easily escapes to the outside through the surrounding wall surface of the combustion chamber.

A first object of the present invention is to save energy by reducing as much as possible the thermal energy loss due to the above-mentioned exhaust gas in a water heater. In order to achieve this purpose, the water heater of the present invention has the following features:
A water heater body is formed by forming a water passage in a cylindrical vessel wall surrounding the combustion chamber, and a flange body is fixed to the outer periphery of the upper opening edge of the cylindrical air-permeable solid, and the lower end opening of the air-permeable solid is fixed. is closed by a bottom plate, and the flange body is fixed to the inner periphery of the water heater main body, so that a breathable solid is provided in the upper part of the combustion chamber so that its outer periphery faces the water heater, and the combustion chamber is closed. The combustion exhaust gas generated in the above is discharged by flowing inwardly through the outer circumferential surface of the air-permeable solid.

In the present invention, breathable solids refer to heat-resistant materials such as metals and ceramics in the form of nets, honeycombs, fibers, etc.
A solid body of an appropriate thickness formed into a porous or other air permeable form. The air-permeable solid has an extremely large substantial surface area and a significantly large convective heat transfer coefficient when gas flows through it. Therefore, when high-temperature gas flows through the air-permeable solid, heat exchange takes place actively, and the high-temperature gas Thermal energy possessed by the gas is exchanged into radiant heat, and the radiant heat is mainly radiated to the upstream side of the gas.

The present invention is based on the above knowledge, and one embodiment of the water heater of the present invention will be described below with reference to FIG. The water heater main body 1 has a hollow cylindrical vessel wall surrounding a combustion chamber 3 to form a water passage 2, and numeral 4 indicates a water supply port communicating with the water passage 2 at the bottom of the water heater main body 1; is the hot water outlet that communicates with the water passage 2 at the top of the water heater body 1, 6 is the combustion chamber floor, and 7 is the water heater body 1
A kerosene combustion burner unit is provided on the side wall near the bottom of the water heater and blows out flame into the combustion chamber 3, 8 is a heat insulating material covering the outer periphery of the water heater body 1, and 9 is an exhaust port provided at the top of the water heater body 1. Note that the same reference numerals in FIG. 2 as in FIG. 1 indicate the same or corresponding parts. However, in the product according to the present invention shown in FIG.
A breathable solid body 11 is formed by stacking 8 wire meshes of 0.3 mm and 32 mesh and rolling them into a cylindrical shape, and a flange body 12 is fixed to the outer periphery of the upper opening of the breathable solid, and the lower end opening is attached to the bottom plate 13. Twisted and blocked;
By fixing the flange body 12 to the inner periphery of the water heater main body 1, the breathable solid 11 is provided in the upper part of the combustion chamber 3 so that its outer periphery faces the water passage 2. In the water heater configured in this way, the combustion exhaust gas generated in the combustion chamber 3 permeates through the outer circumferential surface of the breathable solid 11, reaches the inner circumference thereof, and is discharged to the exhaust port 9. At that time, the heat of the combustion exhaust gas is transferred to the air-permeable solid 1 by convection heat transfer.
1 and makes the upstream side surface of the gas permeable solid, that is, the outer peripheral surface, red hot. Therefore, if any unresolved components remain in the combustion exhaust gas, they will be re-burned when they come into contact with the high-temperature gas permeable solid 11. The radiant heat radiated from the upstream side surface of the air-permeable solid 11 heats the inner peripheral surface of the water heater body 1 and raises the temperature of the water supply in the water passage 2.

In order to confirm the effect of the product implementing the present invention, we compared it with the conventional product shown in Figure 1 and found that the kerosene combustion chamber was 4×10 ⁴
While the water temperature increase in kcal/h was 25°C in the conventional product, it was 27°C in the product implementing the present invention.
In addition, when comparing the carbon monoxide concentration in the exhaust gas, the conventional product had a concentration of 150 PPM, while the product implementing the present invention had a concentration of 10 PPM.The present invention was also recognized to have a remarkable effect in reducing the amount of unforeseen emissions. . In this way, according to the present invention, combustion efficiency can be improved, so even if the air ratio is lowered from the usual 1.5 to 2.0 to around 1.2, the amount of unforeseen emissions can be reduced for practical purposes or for pollution prevention. It does not occur in such large numbers that it becomes a problem. Therefore, thermal efficiency can be further improved with a lower air ratio. In addition, the combustion noise of the product implemented in the present invention was reduced by 10 decibels compared to the conventional product, and a secondary effect of noise prevention was also observed. Therefore, it is particularly suitable for consumer equipment where noise is a problem, but it can of course also be applied to industrial boilers.

Another embodiment of the invention shown in FIG. 3 has a water passage 2' separated from the water passage 2 so that the heat of the exhaust gas downstream of the air-permeable solid 11 toward the exhaust port can be recovered; A communication pipe 1 which provides a water supply port 5 in the water passage 2' and communicates the water passage 2' with the water passage 2.
4 is provided, and the water passage 2' is formed so as to correspond to the downstream side of the exhaust gas of the breathable solid 11. Furthermore, in the embodiment shown in FIG. 4, a heat transfer pipe 15 connected to the water supply port 4 is disposed in a coil shape on the downstream side of the air permeable solid 11, and preheated water is passed through the heat transfer pipe. The water is supplied to the water passageway 2 through the communication pipe 16. By configuring the system so that the heat of the exhaust gas on the downstream side of the breathable solid 11 is used for preheating, the thermal efficiency is further improved. That is, the breathable solid 11 has the effect of insulating the upstream side and the downstream side, so that even if cold water is passed through the downstream side for preheating, even the heat on the upstream side can be absorbed into the downstream side. Therefore, this configuration is expected to further improve thermal efficiency.

As described above, in the water heater of the present invention, a passageway is formed in the cylindrical vessel wall surrounding the combustion chamber, and a cylindrical air-permeable solid is placed above the combustion chamber so that its outer peripheral surface faces the passageway. Since the combustion exhaust gas is discharged by flowing inward from the outer peripheral surface of the breathable solid, the radiant heat radiated from the breathable solid is absorbed into the passageway without waste, and is effective in raising the temperature of the hot water. It is used to increase thermal efficiency, which has a beneficial effect on energy conservation.

[Brief explanation of drawings]

FIG. 1 is a vertical cross-sectional view of a conventional water heater, FIG. 2 is a vertical cross-sectional view showing an embodiment of the present invention, and FIGS. 3 and 4 are vertical cross-sectional views showing another embodiment of the present invention. It is. DESCRIPTION OF SYMBOLS 1... Water heater main body, 2... Water passage, 3... Combustion chamber, 9... Exhaust port, 11... Breathable solid, 12...
...Flange body, 13...Bottom plate.

Claims (1)

[Claims] 1. A water heater body is formed by forming a water passage in a cylindrical vessel wall surrounding a combustion chamber, and a flange body is fixed to the outer periphery of the opening edge of the upper end of the cylindrical air-permeable solid, and at the same time, the lower end of the air-permeable solid is The opening is closed by the bottom plate,
By fixing the flange body to the inner circumference of the water heater main body, a breathable solid is provided in the upper part of the combustion chamber so that its outer circumferential surface faces the water passage device, and the combustion exhaust gas generated in the combustion chamber is transferred to the ventilation chamber. A water heater characterized by discharging solids by flowing them inward from the outer peripheral surface.