JPS6060451A - Water heater - Google Patents

Abstract

PURPOSE:To disturb the flow of combustion gas and consequently improve the thermal efficiency by a structure wherein baffle plates, which are nearly horizontal and arranged in zigzags, are arranged on the vertical outer peripheral surfaces of a baffle body. CONSTITUTION:A baffle 5 consists of a quadrangular prism-shape baffle body 14 with an upper and a lower ends covered by lids and circular arc-shape baffle plates 7. The baffle plates 7 are attached on the vertical outer peripheral surfaces of the baffle body 14 at proper intervals and do not line in the same horizontal plane as the adjoining baffle plates 7 in several stages. Due to the constitution as described above, the high temperature combustion gas produced by a burner 11 flows along the inner wall of an inner shell 1 and is given repeated sharp directional changes along combustion gas paths 13, resulting in disturbing the flow of combustion gas.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to improving the thermal efficiency of a jacket heat exchanger for a domestic hot water boiler.

Structure of conventional example and its problems Conventionally, this type of hot water boiler has an ice chamber 3 provided in the gap between an inner shell 1 and an outer shell 2 having bottom surfaces, and an ice chamber 3 formed inside the inner shell 1, as shown in FIG. A baffle 5 detachably disposed in the combustion chamber 4 is formed by a support rod 6 and a baffle plate 7. The buckle plate 7 has a disk shape and is attached to supports 4 and 6 in several stages in the horizontal direction at appropriate intervals. The baffle 5 is fixed to a part 79 having a chimney 8 above the combustion chamber 4 via a hook 10. The burner 11 passes through the inner shell 1, the water chamber 3, the outer shell 2, and faces the lower part of the combustion chamber 4.

The high-temperature combustion gas generated by the burner 11 collides with the lowermost baffle plate 7, and then passes through the throttle 9 portion 12 formed between the inner shell 1 and the baffle plate 7. Thereafter, the combustion gas flows along the inner wall of the inner shell 1 according to the combustion gas path 13, or flows away from the inner wall of the inner shell 1 while flowing through the inner shell 1.
and the baffle 5, exchanges heat with the water chamber 3, and is then exhausted from the chimney 8. This configuration forcibly approaches the inner wall of the inner shell 1 by the entire combustion gas calibration part 12, and further disturbs the flow so that it spreads in the direction of the support rod 6 after passing through the constriction part 12, improving thermal efficiency. It had some problems.

1. Even if the number of stages of the baffle plates 7 is increased and the interval between the baffle plates 7 is decreased for the purpose of improving thermal efficiency, no significant effect is obtained, and the passage resistance only increases. This is because after the combustion gas passes through the constriction part 12, the direction is changed to the support rod 6, and then to the next constriction part 12. However, if the interval between the baffle plates 70 is small, the passage resistance due to these two direction changes becomes extremely large. Become. Therefore, most of the combustion gas flows from the constriction section 12 to the next constriction section 12 without changing direction.
As a result, the flow of combustion gas becomes less turbulent, and the rate of increase in heat transfer coefficient becomes smaller.

2. Because the baffle plate 7 has a disc shape, it is susceptible to thermal stress and easily deforms.

OBJECTS OF THE INVENTION The present invention solves all of the problems of the prior art, and aims to improve the thermal efficiency of a hot water boiler by using a baffle with a simple structure.

Structure of the Invention In order to achieve this object, the present invention provides a baffle consisting of a partition body whose upper and lower ends are closed and baffle plates arranged in a staggered manner in a substantially horizontal direction around the vertical outer periphery of the partition body. A combustion gas path is formed between the baffle and the inner wall of the inner shell, through which the combustion gas circulates throughout.

With this configuration, the combustion gas always flows along the inner wall of the inner shell, and while the combustion gas flows through the tightened part between the inner shell and the baffle plate, it mainly flows between the two baffle plates, and the combustion gas circulates and extends. A road was formed. Furthermore, since the baffle plates are arranged in a staggered manner, the combustion gas flows through repeated rapid direction changes, improving the heat transfer coefficient.

Since the baffle plate can be divided into small pieces in the partition body with a strong structure, there is a large degree of freedom for thermal expansion. Therefore, the baffle plate becomes resistant to thermal deformation.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 2 to 4. The baffle 5 is formed by a quadrangular prism-shaped partition 14 whose upper and lower ends are closed by attaching a lid or the like, and an arc-shaped baffle grate 7. The baffle plates 7 are attached to the vertical outer circumferential surface of the partition body 140 at appropriate intervals and in several stages so as not to be located on the same horizontal plane as adjacent baffle plates 7. In addition,
The same sections as in Figure 1 are numbered the same.

In the above configuration, the high temperature combustion gas generated by the burner 11 flows along the inner wall of the inner shell 1, and the combustion gas path 13
According to the sudden change of direction, the money flows repeatedly,
The flow of combustion gas is disturbed.

Therefore, the heat transfer coefficient becomes significantly high, so that the thermal efficiency can be improved.

The baffle grate 7 is small and only one end has a partition body 14
Since it is attached to the base, it can freely expand thermally, so the generation of thermal stress is small. Therefore, it is resistant to thermal deformation.

Effects of the Invention As described above, the present invention provides a combustion chamber with a partition body whose upper and lower ends are closed, and a substantially horizontal direction on the vertical outer peripheral surface of the partition body.
According to a hot water boiler in which a baffle formed by staggered baffle plates is arranged and a combustion gas path circulates between the baffle and the inner wall of the inner shell, the following effects can be obtained.

(1) Combustion gas is arranged in a staggered manner by repeated rapid direction changes due to the staggered arrangement of plates, which disturbs the flow of combustion gas, resulting in higher thermal efficiency and the ability to downsize hot water boilers.

? ) Since the baffle plate can thermally expand relatively freely, it generates little thermal stress and is less likely to be thermally deformed.

[Brief explanation of drawings]

FIG. 1 is a vertical cross-sectional view of a conventional system using a disk-shaped baffle plate, FIG. 2 is a vertical cross-sectional view showing the entire hot water boiler according to an embodiment of the present invention, and FIG. 3 is a line A-A in FIG. 4 is a perspective view of the baffle of FIG. 2; 1...Inner shell, 4...Combustion chamber, 5...
・Baffle, 7... Baffle play, G, 8...
・Chimney, 13... Combustion gas path, 14... Partition body.

Claims (1)

[Claims] In the inner shell leading from the combustion chamber to the chimney, there is a partition body whose upper and lower ends are closed, and approximately horizontally on the vertical outer peripheral surface of this partition body.
A hot water boiler is provided with a baffle consisting of staggered baffle plates, and a combustion gas passage through which combustion gas circulates is formed between the baffle and the inner wall of the inner shell.