JP2009216318A - Energy saving type hot water supply boiler - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an energy saving type hot water supply boiler greatly improving a heat recovery rate, and substantially reducing consumption of kerosene and generation of CO<SB>2</SB>. <P>SOLUTION: The energy saving type hot water supply boiler 11 includes a hot water supply tank case 21, a sub tank 22 arranged along an inner wall of the hot water supply tank case 21, and a main tank 23 arranged along an inner wall of the sub tank 22 at a predetermined distance away from the sub tank 22. The main tank 23 is communicated with the sub tank 22, and a combustion gas chamber 25 of a predetermined size is formed opened downward in a center part. Combustion gas supplied from a burner 13 enters into the combustion gas chamber 25 of the main tank 23 center part, it passes below the main tank 23, it rises between the main tank 23 and the sub tank 22, it flows above the main tank 23, and it heats the main tank 23 so as to surround it. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

The present invention relates to an energy-saving hot water boiler capable of dramatically improving the heat recovery rate and greatly reducing the consumption of kerosene and the generation of CO ₂ .

  This type of conventional hot water boiler includes, for example, a hot water tank 2, a burner 3 that supplies combustion gas into the hot water tank 2 from the lower outer peripheral portion of the hot water tank 2, and a burner 3, as in a hot water boiler 1 shown in FIG. The hot water tank 2 includes a hot water tank case 5 and an internal tank 6 provided in a flow path along the inner wall of the hot water tank case 5. A combustion gas chamber 7 having a predetermined size is formed in the part so as to open upward. In the figure, 8 is a water supply pipe and 9 is a hot water supply pipe.

Thus, in the hot water supply boiler 1, due to the tank structure, the combustion gas of the burner 3 enters the combustion gas chamber 7 from the lower outer peripheral portion of the hot water supply tank 2, and the internal tank 6 is heated from the inner wall surface. The hot water supply tank case 5 is discharged outward from above.
The hot water supply boiler 1 has a problem that the area where the combustion gas contacts the internal tank 6 is 50% or less of the total surface area of the internal tank 6 and the heat recovery efficiency is poor.

As prior art documents of this type of conventional hot water boiler, there are, for example, Patent Documents 1 and 2, which include exhaust gas discharged from a boiler or water heater and passed through an economizer, and a boiler supplied to the economizer. A heat recovery device that recovers heat from the exhaust gas that has passed through the economizer by directly contacting the captured water in the scrubbing exhaust heat recovery device to exchange heat between the exhaust gas and the captured water. Are listed.
Patent Document 2 describes a heat storage structure of a boiler or a hot water heater configured to heat water or hot water flowing through the water supply pipe and the return pipe arranged meandering with the heat of exhaust gas.
JP 2005-164118 A JP 2001-65979 A

As described above, the hot water boiler shown in FIG. 4 has a problem that the area where the combustion gas is in contact with the internal tank is 50% or less of the total surface area of the internal tank, resulting in poor heat recovery efficiency.
Therefore, it is desired to improve the heat recovery efficiency by improving the internal tank of the hot water boiler shown in FIG.
Patent Documents 1 and 2 are techniques for recovering the heat of exhaust gas, but do not improve the internal tank of a hot water boiler.

In view of the above-described situation, the present invention has a structure in which the main tank is wrapped with flame, and by providing a sub-tank for preheating, the heat recovery rate is dramatically improved, and the consumption of kerosene and CO ₂ are increased. An object of the present invention is to provide an energy-saving hot water boiler that can greatly reduce the occurrence of water.

In order to solve the above problems, the present invention provides the following configurations.
The invention according to claim 1 includes a hot water tank case,
A sub tank provided along the inner wall of the hot water tank case;
A main tank disposed along the inner wall of the sub tank and spaced apart from the sub tank by a predetermined distance;
The main tank is in communication with the sub tank, and is installed such that the bottom part is spaced apart from the inner bottom part of the hot water tank case by a predetermined distance, and a combustion gas chamber of a predetermined size is opened downward in the center part.
The combustion gas supplied into the hot water tank case enters the combustion gas chamber at the center of the main tank, heats the inner wall of the main tank, passes under the main tank, and heats the lower portion of the main tank. Then, the space between the main tank and the sub tank rises to heat the outer wall portion of the main tank and the inner wall portion of the sub tank, and flows above the main tank to heat the upper wall portion of the main tank. And discharged outward from the hot water tank case,
The water supplied into the hot water tank case is configured to be preheated after entering the sub tank and then into the main tank, heated, and then discharged from the main tank to be supplied with hot water. An energy-saving hot-water supply boiler is provided.

  The invention according to claim 2 is characterized in that a burner for sending combustion gas into the combustion gas chamber in the central portion of the main tank is provided on the upper outer wall portion of the hot water tank case. A type hot water boiler is provided.

  The invention according to claim 3 provides the energy-saving hot water boiler according to claim 2, wherein the burner is connected to a blower.

According to a fourth aspect of the present invention, an exhaust heat recovery tank is provided downstream of the combustion gas discharged outward from the hot water tank case, and a heat recovery pipe is disposed in the exhaust heat recovery tank,
Combustion gas discharged outward from the hot water tank case flows into the exhaust heat recovery tank and heats the heat recovery pipe, and is then discharged outward from the exhaust heat recovery tank.
Instead of the flow of water supplied into the hot water tank case entering the sub tank, water is supplied into the heat recovery pipe in the heat recovery pipe, and the hot water preheated in the heat recovery pipe is The energy-saving hot water boiler according to any one of claims 1 to 3, wherein the boiler is configured to flow into a sub tank.

  The invention according to claim 5 provides the energy-saving hot water boiler according to claim 4, wherein the exhaust heat recovery tank is provided above the hot water tank case.

  The invention according to claim 6 provides the energy saving hot water boiler according to claim 4 or 5, wherein the heat recovery pipe is fixed by a fixing member that also functions as a heat absorption fin.

  The invention according to claim 7 provides the energy saving hot water boiler according to claim 6, wherein the fixing member is formed in a spiral shape.

  The invention according to claim 8 is the energy saving according to any one of claims 4 to 7, wherein the heat recovery pipe is a bent pipe folded back at an upper part and a lower part in the exhaust heat recovery tank. A type hot water boiler is provided.

  The invention according to claim 9 is characterized in that the main tank and the sub tank are held at a predetermined interval by a spacer that also functions as a heat absorption fin. An energy-saving hot-water supply boiler described in 1 is provided.

According to the invention described in claim 1 of the present invention, the heat recovery rate is drastically improved by providing the sub-tank for performing the preheating with the structure in which the main tank is wrapped with flame, and the consumption of kerosene In addition, an energy-saving hot water boiler that can greatly reduce the generation of CO ₂ can be provided.

  According to the invention described in claim 2, in addition to the effect of the invention described in claim 1, the combustion gas is fed into the upper part of the combustion gas chamber, and the inner wall of the main tank is heated while the combustion gas moves downward. Furthermore, the heat recovery efficiency can be increased by heating the outer wall portion of the main tank while the combustion gas moves upward from below.

  According to the invention described in claim 3, in addition to the effect of the invention described in claim 2, air can be sent to the burner and burned efficiently.

  According to invention of Claim 4, in addition to the effect of the invention as described in any one of Claims 1 to 3, it can preheat with an exhaust heat recovery tank, and can also improve heat recovery efficiency.

  According to the invention described in claim 5, in addition to the effect of the invention described in claim 4, a smooth flow of the exhaust gas can be obtained, heat loss of the exhaust gas can be prevented, and the heat recovery efficiency can be increased.

  According to the invention described in claim 6, in addition to the effect of the invention described in claim 4 or 5, the heat recovery pipe can be stably fixed, and the heat absorption efficiency of the heat recovery pipe can be increased.

  According to the invention described in claim 7, in addition to the effect of the invention described in claim 6, the heat absorption efficiency of the heat recovery pipe can be further increased.

  According to the invention described in claim 8, in addition to the effect of the invention described in any one of claims 4 to 7, the heat absorption efficiency of the heat recovery pipe can be further increased.

  According to the invention described in claim 9, in addition to the effect of the invention described in any one of claims 1 to 8, the heat absorption efficiency of the main tank and the sub tank can be further increased.

Hereinafter, embodiments of the present invention will be described with reference to the drawings showing examples.
In FIG. 1, reference numeral 11 denotes an energy-saving hot water boiler according to a first embodiment of the present invention. The energy-saving hot water boiler 11 includes a hot water tank 12 and a burner 13 for feeding combustion gas into the hot water tank 12. And a blower 14 for supplying air to the burner 13.

The hot water supply tank 12 includes a hot water supply tank case 21, a sub tank 22 as a first internal tank provided along the inner wall of the hot water supply tank case 21, and a predetermined distance from the sub tank 22 along the inner wall of the sub tank 22. And a main tank 23 as a second internal tank.
The main tank 23 and the sub tank 22 are held at a predetermined interval by a spacer 24 that also functions as a heat absorption fin.
The sub tank 22 has an outer peripheral wall that also serves as an inner wall portion of the hot water tank case 21, a water chamber is formed therein, and the water chamber is a water channel through which water or hot water flows.

  Further, the main tank 23 communicates with the sub-tank 22 and is installed such that the bottom part is spaced apart from the inner bottom part of the hot water tank case 21 by a predetermined distance, and a combustion gas chamber 25 having a predetermined size is opened downward in the center part. The water chamber is formed in the wall portion. That is, the main tank 23 is formed in a cylindrical shape with a bottom, and is installed so that the opening thereof opens downward, and the side walls and the upper wall portion serve as water chambers to form a water channel through which water or hot water flows.

  The burner 13 is a variable control (volume control) type, and is provided on the upper outer wall portion of the hot water tank case 21 in order to send the combustion gas into the upper portion of the combustion gas chamber 25 at the center of the main tank 23. . It is also possible to use an ON / OFF control type for the burner 13.

  In the figure, 26 is a water supply pipe for supplying water to the sub tank 22, 27 is a hot water supply pipe for supplying hot water discharged from the main tank 23, 28 is a communication pipe for supplying hot water from the sub tank 22 to the main tank 23, 29 Is a combustion gas passage between the sub tank 22 and the main tank 23, 30 is a discharge port for discharging combustion gas from the hot water tank case 21, 31 is a hot water boiler case, and 32 is a thermocouple mounting port.

  Thus, the combustion gas supplied from the burner 13 into the hot water supply tank 12 enters the combustion gas chamber 25 at the center of the main tank 23 and heats the inner wall portion of the main tank 23 as shown by the arrow wavy lines in the figure. The lower part of the main tank 23 is heated through the lower part of the main tank 23, and the combustion gas passage 29 between the main tank 23 and the sub tank 22 is raised so that the outer wall part of the main tank 23 and the inner wall part of the sub tank 22 are Is heated to flow above the main tank 23, and the upper wall portion of the main tank 23 is heated and discharged outward from the discharge port 30 of the hot water supply tank case 21.

  On the other hand, the water supplied from the water supply pipe 26 into the hot water supply tank 12 enters the sub tank 22 and is preheated as shown by the solid arrow in the figure, and then enters the main tank 23 through the communication pipe 28 and is heated. Then, the hot water is discharged from the main tank 23 and supplied from the hot water supply pipe 27.

  Thus, the energy-saving hot water supply boiler 11 according to the first embodiment of the present invention can wrap the inside and outside of the main tank 23 and the upper and lower surfaces with flame as described above, and can preheat the sub tank 22. Therefore, the heat recovery efficiency is greatly improved.

  2 and 3, reference numeral 41 denotes an energy-saving hot-water supply boiler according to a second embodiment of the present invention. The energy-saving hot-water supply boiler 41 is a hot-water supply tank of the energy-saving hot-water supply boiler (11 in FIG. 1). An exhaust heat recovery tank 42 is provided downstream of the combustion gas discharged outward from the case 21, and a heat recovery pipe 43 is disposed in the exhaust heat recovery tank 42.

The exhaust heat recovery tank 42 is preferably provided above the hot water tank case 21, and the heat recovery pipe 43 is fixed by a fixing member 44 that also functions as a heat absorption fin. Although not shown, the fixing member 44 may be formed in a spiral shape.
The heat recovery pipe 43 is formed in a bent pipe shape that is folded back at the upper and lower portions in the exhaust heat recovery tank 42.
In the energy saving hot water supply boiler 41 of the second embodiment, the water supply pipe (26 in FIG. 1) provided in the energy saving hot water supply boiler (11 in FIG. 1) of the first embodiment is used. Instead, a water supply pipe 45 for supplying water to the heat recovery pipe 43 is provided. Instead of the communication pipe (28 in FIG. 1), a communication pipe 46 for sending hot water from the heat recovery pipe 43 to the sub tank 22 and the sub tank 22 A communication pipe 47 for supplying hot water to the main tank 23 is provided.

  Thus, the combustion gas supplied from the burner 13 into the hot water supply tank case 21 enters the combustion gas chamber 25 at the center of the main tank 23 and heats the inner wall portion of the main tank 23 as shown by the broken arrows in the figure. Then, under the main tank 23, the lower part of the main tank 23 is heated, the combustion gas passage 29 between the main tank 23 and the sub tank 22 is raised, and the outer wall portion of the main tank 23 and the inner wall of the sub tank 22 are raised. Is heated to flow above the main tank 23, and the upper wall portion of the main tank 23 is heated to be discharged from the hot water supply tank case 21 to the exhaust heat recovery tank 42. The combustion gas that has flowed into the exhaust heat recovery tank 42 heats the heat recovery pipe 43 and is then discharged upward and outward from the exhaust heat recovery tank 42.

On the other hand, the water supplied from the water supply pipe 45 into the heat recovery pipe 43 is preheated in the heat recovery pipe 43 as shown by a solid arrow line in FIG. After entering the sub tank 22 through 46 and preheated in the sub tank 22, it enters the main tank 23 through the communication pipe 47, is heated, and hot water is supplied from the main tank 23 through the hot water supply pipe 27.
Thus, the energy saving hot water supply boiler 41 of the second embodiment of the present invention can further increase the heat recovery efficiency by preheating with the exhaust heat recovery tank 42.

1 is a front longitudinal sectional view of an energy saving hot water boiler according to a first embodiment of the present invention. It is a front longitudinal cross-sectional view of the energy saving hot water supply boiler by 2nd Example of this invention. It is the sectional view on the AA line of the previous FIG. It is a front longitudinal cross-sectional view of the hot water boiler of a prior art example.

Explanation of symbols

11, 41 Energy saving hot water boiler 13 Burner 14 Blower 21 Hot water supply tank case 22 Sub tank 23 Main tank 24 Spacer 25 Combustion gas chamber 42 Waste heat recovery tank 43 Heat recovery pipe 44 Fixing member

Claims (9)

A hot water tank case,
A sub tank provided along the inner wall of the hot water tank case;
A main tank disposed along the inner wall of the sub tank and spaced apart from the sub tank by a predetermined distance;
The main tank is in communication with the sub tank, and is installed such that the bottom part is spaced apart from the inner bottom part of the hot water tank case by a predetermined distance, and a combustion gas chamber of a predetermined size is opened downward in the center part.
The combustion gas supplied into the hot water tank case enters the combustion gas chamber at the center of the main tank, heats the inner wall of the main tank, passes under the main tank, and heats the lower portion of the main tank. Then, the space between the main tank and the sub tank rises to heat the outer wall portion of the main tank and the inner wall portion of the sub tank, and flows above the main tank to heat the upper wall portion of the main tank. And discharged outward from the hot water tank case,
The water supplied into the hot water tank case is configured to be preheated after entering the sub tank and then into the main tank, heated, and then discharged from the main tank to be supplied with hot water. A featured energy-saving hot water boiler.   The energy-saving hot water boiler according to claim 1, wherein a burner for sending combustion gas into the combustion gas chamber at the center of the main tank is provided on an upper outer wall portion of the hot water tank case.   The energy-saving hot water boiler according to claim 2, wherein the burner is connected to a blower. An exhaust heat recovery tank is provided downstream of the combustion gas discharged outward from the hot water tank case, and a heat recovery pipe is disposed in the exhaust heat recovery tank,
Combustion gas discharged outward from the hot water tank case flows into the exhaust heat recovery tank and heats the heat recovery pipe, and is then discharged outward from the exhaust heat recovery tank.
Instead of the flow of water supplied into the hot water tank case entering the sub tank, water is supplied into the heat recovery pipe in the heat recovery pipe, and the hot water preheated in the heat recovery pipe is The energy-saving hot-water supply boiler according to any one of claims 1 to 3, wherein the boiler is configured to flow into a sub tank.   The energy-saving hot water boiler according to claim 4, wherein the exhaust heat recovery tank is provided above the hot water tank case.   6. The energy saving hot water boiler according to claim 4, wherein the heat recovery pipe is fixed by a fixing member that also functions as a heat absorption fin.   The energy-saving hot water boiler according to claim 6, wherein the fixing member is formed in a spiral shape.   The energy saving hot water supply boiler according to any one of claims 4 to 7, wherein the heat recovery pipe is a bent pipe folded back at an upper part and a lower part in the exhaust heat recovery tank.   The energy-saving hot water boiler according to any one of claims 1 to 8, wherein the main tank and the sub tank are held at a predetermined interval by a spacer that also functions as a heat absorption fin. .

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