JPH0639232Y2 - Exhaust top structure of water heater - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to an exhaust top structure suitable for a water heater installed outdoors.

[Conventional technology]

FIG. 3 is a front view showing a conventional water heater for outdoor installation, FIG.
The figure is a sectional view taken along the line IV-IV.

A gas burner 2 is installed in the combustion cylinder 1.

The fuel gas is supplied from the gas nozzle 3, and the combustion air is supplied from the fan 4. The fuel gas ejected upward from the gas burner 2 burns in the combustion cylinder to form a flame, which heats the water while flowing in the heat exchanger 5 as shown by the arrow a, and then from the exhaust top 6 as shown by the arrow b. Spills into.

An enlarged cross section near the exhaust top is shown in FIG.

An exhaust louver (A) 7 is provided in the exhaust top 6,
A rainproof plate 8 is provided to cover the upstream opening of the exhaust top 6.

Further, an exhaust louver (B) 9 is attached to the exhaust top 6 via an exhaust louver seal packing 22 inside the rainproof plate 8.

The exhaust gas that has passed through the heat exchanger 5 flows as shown by arrows c, d, and e and is discharged into the atmosphere.

Further, when rain is blown in from the outside of the exhaust top 6, one part of the raindrop hits the exhaust louver (A) 7, and the other part hits the rainproof plate 8 and flows down, and the drain hole 11 of the exhaust top 6 Flows down from.

Further, the raindrops that have passed through the rainproof plate 8 hit the exhaust louver (B) 9 and are captured, flow down as shown by arrow f, and are discharged from the water drain hole 11.

Rainwater leaking from the exhaust louver seal packing 22 is guided laterally (toward the back of the paper in the figure) by the gutter 10 and discharged.

[Problems to be solved by the device]

In the above conventional example, the water droplets 12 flowing down from the water drain hole 11
Attaches to the front cover 13 and gets down. This water drop
Since 12 contains corrosive products such as nitrogen oxides (NOx) and sulfur oxides (SOx) in the exhaust gas, it damages the paint of the front cover 13 and prevents the steel plate of the front cover from being damaged. Corrosion.

However, if the water drain hole 11 is not provided, raindrops are blown into the exhaust top 6 when the wind and rain are heavy, and a large amount of rainwater leaks from the exhaust louver seal packing 22 and flows into the gutter 10. Therefore, gutter 10 is flooded with rainwater.

Further, in the above-mentioned conventional example, since the top surface of the heat exchanger 5 is located at a position almost the same as or lower than the lower edge 15 of the opening of the exhaust top 6, it is possible to avoid heavy rain enough to store water in the exhaust top. At this time, rainwater may go around the exhaust louver (B) 9 and enter the heat exchanger side.

The present invention solves the above-mentioned problems of the prior art and eliminates the possibility of increasing the amount of rainwater flowing into the gutter and intruding rainwater into the equipment, and eliminating the combustion products in the exhaust gas. It is an object of the present invention to provide an exhaust top structure in which rainwater including the water does not touch the front cover.

[Means for Solving the Problems]

In order to achieve the above-mentioned object, the present invention provides an exhaust top of a water heater having a louver at the opening through which the exhaust gas passing through the heat exchanger is released into the atmosphere. Provided at a position lower than the top surface of the exchanger, and
The downstream edge of the lowermost louver of the louvers is superposed and fixed on the lower edge of the exhaust top opening, and the upstream side of the louver is positioned above the heat exchanger to exhaust air. It is characterized in that it is provided with a gradient in the direction of decreasing toward the outside of the top.

Further, according to the present invention, a weir-shaped side edge is provided on both sides of the lowermost louver in which the downstream side edge is superposed and fixed on the lower edge of the exhaust top opening, and the exhaust top of the exhaust top is provided. A fold portion is provided on the front surface to surround the opening, the side edge of the louver is located outside the opening of the exhaust top to incorporate the louver into the exhaust top, and the side edge of the louver is connected to the opening of the exhaust top. It is characterized in that it is covered with a surrounding folding part.

[Action]

Since the exhaust top of the present invention has the structure as described above, rainwater is prevented from entering the lower part of the inner space of the exhaust top (the portion A surrounded by a virtual line in FIG. 5) by the louver at the lowermost stage. To prevent. And, even if there is heavy rain such that water accumulates at the lower edge of the exhaust top opening, rainwater enters the heat exchanger side because the lower edge of the exhaust top opening is located lower than the top surface of the heat exchanger. There is no fear.

In addition, since weir-shaped side edges are provided on both sides of the louver, the side edges are located outside the opening of the exhaust top, and the side edges of the louver are covered by the folding parts of the exhaust top. It is possible to further prevent the rainwater from entering the lower portion of the exhaust top inner space.

〔Example〕

FIG. 1 shows an embodiment of an exhaust top structure according to the present invention and is a sectional view corresponding to FIG. 5 in a conventional example.

In the present invention, as shown in FIG.
Is provided at a position where the lower edge 15 'of the opening is lower than the top surface of the heat exchanger 5 by the dimension H, and the exhaust louver (C) 16 at the lowermost stage (corresponding to the exhaust louver (B) 9 in the conventional example). The downstream edge of the member) is superposed on the lower edge 15 'of the opening and fixed by spot welding, and the upstream side of the louver (C) 16 is positioned above the heat exchanger 5 to form a louver. (C) 16 is provided with a gradient in the direction of decreasing toward the outside of the exhaust top.

An exploded perspective view of this portion is shown in FIG. 2 (A), and a partially broken perspective view is shown in FIG. 2 (B).

As is clear from FIG. 1 and FIG. 2, the exhaust louver (C) 16 of this embodiment is folded up on both sides to form a weir-like side edge 17. A fold portion 14a surrounding the opening is formed on the front surface of the exhaust top 14, and when the louver (C) 16 is incorporated into the exhaust top 14, the side edge 17 of the louver (C) 16 is exhausted. The side edge 17 is located outside the opening of the top 14 so that the side edge 17 is covered by the folded portion 14a of the exhaust top.

Further, the exhaust top 14 is formed with a bead 18 that is locally sheet-metal processed and bulges downward without forming a drain hole in the lower wall as in the conventional case. When this bead is provided, even if the water droplet 12 flowing down from the opening lower edge 15 ′ tries to go around toward the front cover 13, it is cut off by the bead 18 and dripped from the bead 18, and the front cover 13
Can be prevented from being transmitted to.

In FIGS. 1 and 2, 7 is an exhaust louver A, 8 is a rainproof plate, 10 is a gutter, 21 is an exhaust top seal packing, and 22 is an exhaust louver seal packing. It is the same member as the conventional example shown.

Since the exhaust top of the present invention has the structure as described above, rainwater is prevented from entering the lower part of the exhaust top inner space (A part surrounded by phantom lines in FIG. 5) by the lowermost louver. The amount of water leaking into the gutter 10 can thus be significantly reduced. And, even if there is heavy rain such that water accumulates at the lower edge of the exhaust top opening, the lower edge of the exhaust top opening is at a position lower than the top surface of the heat exchanger,
There is no risk of rainwater entering the heat exchanger. Further, even if water drops flowing down from the opening of the exhaust top wrap around toward the front cover, the edges are cut off by the beads, and the corrosion of the front cover can be prevented.

In addition, weir-shaped side edges are provided on both sides of the louver, and the side edges of the louver are located outside the opening of the exhaust top and the side edges of the louver are covered by the folding parts of the exhaust top. It is possible to further prevent the rainwater from entering the lower portion of the exhaust top inner space.

[Effect of device]

As described above, according to the exhaust top structure of the present invention, the amount of rainwater that flows into the gutter is reduced, there is no risk of rainwater entering the equipment even during heavy rain, and the exhaust gas It has an excellent practical effect that rainwater containing combustion products does not touch the front cover.

[Brief description of drawings]

1 and 2 show an embodiment of an exhaust top structure according to the present invention. FIG. 1 is a sectional view, FIG. 2 (A) is an exploded perspective view, and FIG. 2 (B) is a partial view. It is a perspective view drawn by fracture. 3 to 5 show a conventional water heater, FIG. 3 is a partially cutaway front view, FIG. 4 is a sectional view taken along line IV-IV, and FIG. It is an expanded sectional view. 1 ... Combustion barrel, 2 ... Gas burner, 3 ... Gas nozzle,
4 ... Fan, 5 ... Heat exchanger, 6 ... Exhaust top, 7
…… Louvre (A), 8 …… Rainproof plate, 9 …… Louvre (B), 10 …… Gutter, 11 …… Drainage hole, 12 …… Water drop, 13…
… Front cover, 14 …… Exhaust top, 15 ′ …… Lower edge of the exhaust top downstream side opening, 16 …… Exhaust louver (C),
17 ... Side edge of exhaust louver (C), 18 ... Bead.

Claims (2)

[Scope of utility model registration request] 1. In an exhaust top of a water heater having an louver at an opening through which exhaust gas passing through the heat exchanger is released into the atmosphere, a lower edge of the exhaust top opening is located below a top surface of the heat exchanger. The louver is provided at a low position, and the downstream edge of the lowermost louver of the louvers is superposed and fixed on the lower edge of the exhaust top opening, and the upstream side of the louver is heat exchanger. It is positioned above and has a slope in the direction of decreasing toward the outside of the exhaust top,
Exhaust top structure of water heater. 2. A weir-shaped side edge is provided on both sides of the louver having its downstream edge overlapped and fixed on the lower edge of the exhaust top opening, and an opening is formed in front of the exhaust top. A surrounding fold portion is provided, the side edge of the louver is located outside the opening of the exhaust top to incorporate the louver into the exhaust top, and the side edge of the louver is covered by the folding portion that surrounds the opening of the exhaust top. The exhaust top structure for a water heater according to claim 1, wherein