JPS6236030Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a heat exchanger for a water heater that is equipped with a structure for disposing of condensate generated inside the watertight heat exchanger.

As shown in Fig. 1, a conventional heat exchanger of this type has a bottom plate 2 with a burner 1 projecting upward from the center.
and a heat exchange shell 4 around which water tubes 3 are wrapped are watertightly flange-joined via a packing 5, and the water tubes 3 are passed through the upper part of the heat exchange shell 4, and a large number of plate fins 6 are installed in the penetrating portion. is attached. Further, a gasket 7 is also used for the attachment part of the burner 1 to the bottom plate 2. Note that 8 is an exhaust port provided at the top of the heat exchange barrel 4 for discharging the combustion gas after heat exchange with the water tube 3.

The conventional type described above has the advantage of high thermal efficiency, but water contained in the combustion gas is cooled by the water pipe 3 wrapped around the heat exchange cylinder 4,
As dew condenses on the inner wall of the heat exchanger shell 4, the condensate 9 drips along the inner wall of the heat exchanger shell 4 and accumulates on the bottom plate 2, and seeps into the gaskets 5 and 7 of the flange joints and burner mounting parts, causing damage to these parts. The drawback was that it corroded the

The present invention has been made in view of the above-mentioned facts, and provides a heat exchanger for a water heater that evaporates and vaporizes condensate and releases it to the outside without allowing the condensate to seep into the flange joint or burner attachment part. The purpose is to

The basic structure of the present invention is that a bottom plate with a burner projecting upward from the center and a heat exchange body around which a water tube is wrapped are watertightly joined by a flange via a gasket. The periphery is annularly recessed lower than the flange joint, and an eave-shaped drain guide is provided at the bottom of the inner wall of the heat exchanger cylinder, so that the drain flowing along the inner wall of the heat exchanger cylinder is drained from the surface of the drain guide. The dripping condensate is collected on the bottom plate which is recessed lower than the flange joint and burner mounting part to prevent the condensate from seeping into these parts, and the combustion heat causes the condensate to evaporate. and release it to the outside.

Next, one embodiment of the present invention will be described based on the drawings. In the heat exchanger shown in Fig. 2, the same parts as those in the conventional one shown in Fig. 1 are given the same reference numerals.
The difference from the one in FIG. 1 is that the bottom plate 2 is recessed in an annular shape around the burner 1 to be lower than the flange joint, and a drain guide 10 in the form of an annular eave is provided in the lower part of the inner wall of the heat exchange cylinder 4. It is a certain thing.

In this way, the drain 9 that has flowed along the inner wall of the heat exchange cylinder 4 is transmitted along the surface of the drain guide 10 and drips from the lower end of the drain guide 10 to the bottom plate 2, which is recessed lower than the flange joint and burner mounting portion. It is received and stored, gradually evaporated through combustion, and then released to the outside through the exhaust port. Therefore, the drain flowing along the inner wall of the heat exchange cylinder 4 does not come into contact with the flange joints and the packings 5 and 7.
Furthermore, the flange joint, the burner mounting part, and the gaskets 5 and 7 are not immersed in the drain on the bottom plate 2, and the drainage can be prevented from seeping into the gaskets 5 and 7. As a result, the flange joint and the burner installation It will not corrode parts.

FIG. 3 shows another embodiment of the present invention, in which a drain guide 10 may be provided at the lower end of the inner wall of the heat exchange cylinder 4, and the flange joint portion may be covered by this drain guide 10.

Since the present invention is constructed as described above, the condensate travels along the surface of the drain guide and drips from the drain guide to the concave bottom plate, so that the condensate does not seep into the flange joint or burner mounting part, and combustion is possible. It can be evaporated by heat and released to the outside, and by preventing these parts from being corroded by drain, the life of the heat exchanger can be greatly extended.

[Brief explanation of the drawing]

Figure 1 is a sectional view showing an example of a conventional heat exchanger.
FIG. 2 is a sectional view of a main part showing one embodiment of the present invention, and FIG. 3 is an enlarged sectional view of a main part showing another embodiment of the present invention. 1...Burner, 2...Bottom plate, 3...Water pipe, 4...
...Heat exchange cylinder, 5, 7...Packskin, 10...Drain guide.

Claims (1)

[Scope of utility model registration request] A bottom plate with a burner projecting upward from the center and a heat exchanger body with water pipes wrapped around it are watertightly joined by a flange via a packing,
A heat exchanger for a water heater, characterized in that the bottom plate is recessed in an annular shape around the burner lower than the flange joint, and an eave-shaped drain guide is provided at the lower part of the inner wall of the heat exchange cylinder.