JPS6138781B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a hot water boiler, which reduces heat radiation loss during combustion and after combustion is stopped, and at the same time
The purpose is to prevent corrosion of the tank and burner due to condensed water generated during combustion and to improve thermal efficiency.

In general, in a conventional hot water boiler, as shown in FIG.
The flue 14 is designed to heat the water in the tank 15, but since this flue 14 exhausts combustion gas by natural draft, it penetrates the inside of the tank 15 in the vertical direction. There was a problem in that a large amount of heat escaped from the flue 14 along with the combustion gas. Moreover, when combustion is stopped, cold air rises in the flue 14 due to the draft effect, causing a serious problem in that the temperature of the water in the tank 15 rapidly drops. Furthermore, condensed water generated during combustion is stored in tank 15.
There was also a problem in that the lower part of the tank 15 corroded due to accumulation in the lower part of the tank 15, causing holes.

To solve these problems, a hot water boiler as shown in FIG. 3 has recently been proposed. That is, the burner 17 is installed at the bottom of the tank 16.
The tank 16 is directly heated by the burner 17, and the combustion gas is forcibly exhausted by the fan 18, making it a forced supply/exhaust type. In this type of boiler, the flue does not penetrate the inside of the tank 16 in the vertical direction, so there is no problem like the conventional example shown in FIG. 2, but the combustion heat from the burner 17 hits the bottom of the tank. There is a problem in that the heat is reflected and escapes to the outside through the partition plate 19, reducing thermal efficiency.In addition, since the temperature of the burner 17 rises considerably, it is necessary to provide multiple layers of insulation, which increases the cost. There is also.

The present invention eliminates such conventional drawbacks, and one embodiment thereof will be described below with reference to the drawings.

In FIGS. 1a and 1b, 1 is a tank, to which a water supply pipe 2 and a hot water discharge pipe 3 are connected. A heat exchange pipe 4 with open ends on the side of this tank 1
A lid 7 is attached to the burner 5 at one end and a lid 7 having a narrowed exhaust port 6 at the other end, and the exhaust port 6 is provided on the underside of the lid 7. The burner 5 is of a type that rotatably atomizes and burns liquid fuel, and although not shown, a forced air blowing fan is built into the burner 5.

The inside of the heat exchange pipe 4 is used as a combustion chamber,
In order to exchange heat with the water in the tank 4, a double plate 8 having a plurality of stages is connected to this heat exchange pipe 4.
In order to discharge the condensed water generated during combustion, the heat exchange pipe 4 is fixed with a slight slope so that the burner 5 side faces upward, and the exhaust port 6 is connected to the lid 7. It is located at the bottom.

Further, a combustion tube 9 is provided in the heat exchange pipe 4 to prevent the flame from coming into contact with the inner wall of the heat exchange pipe near the tip of the burner, thereby preventing the flame from the inner wall and the generation of CO due to cooling. There is.

10 is an exhaust cover connected to the exhaust port 6 of the heat exchange pipe 4, 11 is an exterior body covering the tank 1, and 12 is a burner case.

In the above configuration, this boiler is the burner 5
When combusted, the combustion gas is forcibly blown by a fan in the burner 5, passes through the heat exchange pipe 4, and is discharged from the exhaust port 6 to the exhaust cover 10. Then, when passing through the heat exchange pipe 4,
The combustion gas heats the water in the tank 1 through the wall of the heat exchange pipe 4. At this time, the heat exchange pipe 4 through which the burnt gas is passed is installed penetrating the tank 1 at a suitable location at the bottom, so the entire outer circumference of the heat exchange pipe 4 comes into contact with the water in the tank 1, and the heat exchange pipe 4 Almost all of the heat of the combustion gas radiated from the peripheral wall of No. 4 is used for heating the water. In other words, almost all of the heat radiated from the combustion gas during operation is effectively used for water heating. Moreover, the heat exchange pipe 4 is installed horizontally with a slight slope with the burner 5 side facing upward, and the exhaust port 6 is connected to the lid 7.
Since it is provided below the tank 1, there will be no draft action in the heat exchange pipe when combustion is stopped, and water in the tank 1 will not be cooled by the flow of cold air.

On the other hand, in the boiler of this embodiment, the combustion tube 9 is provided on the inner wall of the heat exchange pipe 4 adjacent to the burner 5, and this part is made into a double wall.
This eliminates the possibility that the flame from the heat exchanger pipe 4 directly contacts the inner wall of the heat exchange pipe 4 and is cooled, which has the advantage of achieving clean combustion with less generation of CO and the like.

In addition, in this embodiment, the heat exchange pipe 4 is inclined so that the exhaust port 6 side is lower, and the exhaust port 6 is provided below the lid 7, so even if the combustion gas does not flow inside the heat exchange pipe 4. Even if there is a case where the burner is cooled and condensation water is generated, this condensation water flows out from the exhaust port 6 to the exhaust cover 10 and flows into the burner 5 side, impairing the function of the burner 5. disappears. moreover,
Since the exhaust port 6 is narrowed to a sufficiently small cross-sectional area with respect to the cross-sectional area of the heat exchange pipe 4, the passage speed of the combustion gas through the heat exchange pipe 4 is extremely slow, resulting in higher heat exchange efficiency. There are some advantages.

In the above embodiment, the forced air fan is built into the burner 5, but it may be installed separately from the burner 5 or may be of a suction type. , it can be installed in any way. Further, the burner 5 may also be one that burns gas rather than one that burns liquid fuel, and may have any form.

As described above, according to the hot water boiler of the present invention,
A heat exchange pipe is passed horizontally between the openings provided on both sides of the tank by creating a slight slope with the burner side facing upward, and a burner is attached to the upper side of the heat exchange pipe, and a lid is attached to the lower side. Since there is a narrow exhaust port on the underside of the lid, there will be no draft effect when combustion stops, and as a result, there will be no heat loss and the water in the tank will be cooled. Furthermore, since the condensed water generated during combustion does not flow into the burner side or accumulate in the combustion section or heat exchange section, corrosion of the burner and heat exchange pipes can be reliably prevented.

[Brief explanation of the drawing]

FIG. 1a is a plan view of a hot water boiler according to an embodiment of the present invention, FIG. 1b is a vertical sectional view of the same boiler, and FIG.
The figure is a longitudinal sectional view of a conventional hot water boiler, and FIG. 3 is a longitudinal sectional view of another conventional hot water boiler. 1... Tank, 2... Water supply pipe, 3... Water discharge pipe,
4...Heat exchange pipe, 5...Burner, 6...Exhaust port, 7...Lid, 8...Bullet plate, 9
... Combustion cylinder, 10 ... Exhaust cover, 11 ... Exterior body, 12 ... Burner case.

Claims (1)

[Claims] 1 Openings are provided on both sides of the tank where the water supply pipe and the hot water discharge pipe are connected, and a heat exchange pipe is passed through the tank horizontally between the openings with a slight slope with the burner side facing upward. A hot water boiler comprising: a burner attached to the upper side of the heat exchange pipe; a lid attached to the lower side; and an exhaust port recessed under the lid. 2. The hot water boiler according to claim 1, further comprising a combustion tube provided near the tip of the burner in the heat exchange pipe to prevent the inner wall of the heat exchange pipe from coming into contact with the flame.