JPS5818031Y2 - Air supply and exhaust system for forced ventilation combustion appliances - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in an air supply/exhaust device for an outdoor forced-air combustion appliance, particularly an instantaneous gas water heater.

In recent years, with the trend of using hot water in a variety of ways, we are increasing the capacity of water heaters, in order to ensure the environmental safety of residents against indoor air pollution, and to solve problems such as installation space in narrow kitchens. There is a tendency for water heaters to be installed on outdoor walls to become more popular.

On the other hand, for the purpose of downsizing or incorporating a burner for high-load combustion, combustion-type gas water heaters with forced ventilation using a blower have been put into practical use, and with this, various air supply and exhaust systems have been introduced. has been invented.

The present applicant has previously devised an air supply/exhaust system for forced ventilation type combustion appliances installed outdoors (see Japanese Utility Model Publication No. 57-44190).

The air supply and exhaust system of this invention is a separate air supply and exhaust type, but because it has a configuration in which the air is exhausted along the wall surface from openings at both ends of a horizontally long exhaust pipe attached to the top of the lid of the combustion appliance, it has the following specific features. It was discovered that an inconvenient problem would occur if the device was installed in a location.

In other words, in recent compact architectural modules such as multi-story apartment buildings, there are various locations for installing outdoor combustion appliances due to floor plans such as kitchens, bathrooms, washrooms, etc., and sometimes it is unavoidable to install outdoor combustion appliances. It is often installed in places such as cul-de-sacs where ventilation is poor, for example, in a hook-shaped recess B of a building or an outer wall W having a wing wall, as shown in Figure 1. However, it was not possible to obtain satisfactory ventilation performance under all external conditions such as wind direction and wind speed.

The inventor of the present invention has discovered that in a device with a leading position, the ventilation force is particularly weak when the device receives wind (5 to 6 m/s or more) directly from the side of the device.

In other words, the wind suppresses the exhaust flow through the exhaust hole opening at the side end and also enters the inside of the container, which prevents normal ventilation and leads to incomplete combustion. 2～
3m/s), the exhaust gas that is once discharged remains in the recess B, so it is recirculated to the air supply side and inhibits combustion, and if this situation becomes noticeable, it may cause a burnout. It will become.

Also, close to where the combustion appliance M is installed, there is an opening C (door,
If there is a window (such as a window), when this part is opened, the stagnant exhaust gas may enter the room and contaminate the indoor air, which is also a problem from an environmental hygiene perspective.

In view of the above problems, the present invention is an air supply/exhaust system that aims to improve the problems of the device of the previous application. Under any conditions, the exhaust gas, which is an important factor in combustion, is not suppressed and is not recirculated to the air supply side, allowing smooth ventilation and stagnation near the equipment. An object of the present invention is to provide an air supply/exhaust device for a forced ventilation type combustion appliance that can also eliminate the problem of indoor air being contaminated due to the intrusion of exhaust gas into the room.

Hereinafter, an embodiment in which the air supply/exhaust device for a forced air combustion appliance according to the present invention is applied to an instantaneous gas water heater will be described with reference to FIGS. 2 to 5.

In the figure, 1 is the combustor body of the water heater, and the heat exchanger 2. A flue 3 is provided, a burner 49 and a blower 5 for forced ventilation are provided at the bottom, and a control device (not shown) is provided, and the container is housed in a container 6 with an open front.

The flue 3 is open at the front above the casing 6.

Further, the air supply passage 7 provided with the blower 5 is located at the lower part of the combustor main body 1 and opens to the front.

Reference numeral 8 denotes a lid body for closing the opening of the casing 6, which has a hole 8a in the upper part through which the open end of the flue 3 is inserted, and an air supply hole 8b near the center of the lower part. An exhaust pipe 9 covering the housing 6 is attached to the front surface, and is attached to the casing 6 with a flange 8C.

The exhaust pipe 9 has a length that is approximately the same as the width of the lid 8, and is oblong with openings at the left and right ends. One opening on the side facing the corner of location B is not closed with the end plate 10, and the other opening on the opposite side has a duct 1 having a length reaching the open space A.
1 and a terminal 12 are sequentially provided horizontally and protrude from the side of the case 6.

A plurality of exhaust holes 13 having cut and raised pieces 14 projecting outward and tilting rearward are provided on each of the four surfaces of the peripheral wall of the terminal 12.

Reference numeral 15 denotes a wind shielding plate that expands in a V-shape from the center to the left and right so as to cover the front of the exhaust port 12a of the terminal 12;
A supporting plate 16 having a width close to the width of the exhaust port 12a is attached to the upper and lower surfaces of the end of the terminal 12 with a sufficient distance S from the exhaust port 12a.

Note that when attaching the lid 8 to the casing 6, a seal backing is interposed between the two, so that the casing 6
The internal space and the exhaust pipe 9 are disconnected from each other.

C is the opening of BvO.

This water heater normally has a structure in which the casing 6 is fitted into the outer wall W and fixed by the flange 8C,
Therefore, the air supply is performed on the front side of the lid 8, and the air is exhausted from the space S and the exhaust holes 1 on the four sides of the peripheral wall of the terminal 12.
It is discharged from 3.

The operation of the air supply and exhaust system of the present invention as described above will be explained below.

First, in the case of no wind or weak wind, when the water heater is operated, combustion air is forcibly sucked in by the blower 5 as shown by the solid arrow from the air supply hole 8b, and participates in combustion in the burner 4.

The high-temperature combustion gas generated by the combustion rises through the combustor main body 1, is stripped of heat in the heat exchanger 2, becomes exhaust gas, and is sent into the flue 3 and the exhaust pipe 9.

However, since there are no holes in the front, upper and lower surfaces of the exhaust pipe 9, and the opening in the recess B is sealed with the end plate 10, all exhaust air is directed toward the open space A as shown by the broken line arrow into the duct 11. Most of the air is discharged from the exhaust port 12a of the terminal 12, but it is also exhausted from the exhaust hole 13 of the terminal 12.

In this case, the exhaust flow is not discharged straight into the open space A.

That is, in front of the exhaust port 12H, there is a ■-shaped wind shield plate 1.
5 is installed, the exhaust air is divided and dissipated along the left and right inclined surfaces, and the exhaust air from the exhaust hole 13 is dissipated along the cut and raised pieces 12a.

Therefore, the exhaust air flows far away without going around the air supply hole 8b, and there is no stagnation of the exhaust air in the recess B where the water heater is installed, so the supply air is fresh.

Next, under windy conditions, if the wind P1 blows from the front, as shown by the white frame arrow in Fig. 4, particularly against the terminal 12 protruding into the open space A, the wind P1 is They hit the V color of the board 15 and are distributed as if winding left and right along the slope, preventing direct entry into the exhaust port 12a, while preventing the air from entering the exhaust port 13 on the upper and lower surfaces of the terminal 12.
Then, as the wind blows obliquely upward along the cut and raised pieces 14, a part of the exhaust gas is sucked out as indicated by the chain arrow shown in FIG.

If the wind blowing at terminal 12 is strong, even if some of the exhaust flow goes around into recess B, the exhaust flow will be sufficiently diluted when being sucked out as described above, so the supply Even if it moves to the side of the pore 8b, there is no problem with combustion at all.

When the side wind P2 blows, the exhaust flow is suppressed by the wind pressure in one half of the exhaust hole 12a and the exhaust hole 13 on the side directly receiving the wind, but the exhaust hole 13 is cut and raised. 14, wind does not directly enter the exhaust passage.

Exhaust gas is discharged through one half of the exhaust port 12a and the exhaust hole 13 on the opposite side @ (negative pressure area).

In addition, the wind at the terminal 12 is downward wind P3. When upward wind P4 blows,
Since the upper and lower sides of the gap S are closed by the support plates 16, the wind does not directly enter the exhaust port 12a and suppress the exhaust flow, and the exhaust air is discharged while being divided left and right along the wind shield plate 15. However, even if the exhaust from the exhaust hole 13 on the side directly receiving the wind is suppressed by the wind pressure as in the case of the side wind P2 described above, it will flow out from the exhaust on the opposite side (L13).

In this way, the air supply and exhaust operation is performed smoothly regardless of whether there is wind or not, and the air that tends to be exhausted is sufficiently diluted and radiated far away.

In the embodiments described above, the water heater is of a wall-embedded type, but the object of the present invention is not limited to the above, and it goes without saying that it can also be applied to a wall-mounted type of exposed appliance.

As described above, the air supply and exhaust system of the present invention has a horizontally elongated exhaust pipe attached to the upper outer surface of the combustion appliance, and a duct and a terminal extending horizontally to the wind pressure zone on the side facing the open space among the openings at both ends. A protruding exhaust passage consisting of a There are multiple exhaust holes with cut and raised pieces that slope backwards, so it can be used in wind conditions in any direction, not to mention in no wind or weak winds. Correspondingly, the exhaust air is discharged from either the exhaust port or the exhaust hole due to the combined effect of the wind shield plate and the cut-and-raised exhaust hole, and the exhaust flow that tends to be discharged is diluted and dissipated in the direction away from the equipment, and the supply Since it does not come close to the pores, recirculation of exhaust gas does not occur, and ventilation can always occur without interfering with combustion.

In addition, even if the device is installed in a recessed area in the entrance as shown in the example, harmful exhaust gas will not stagnate near the device, which will eliminate the problem of indoor air contamination. It is extremely beneficial in terms of environmental health.

[Brief explanation of drawings]

Figure 1 is a perspective view showing the installed state of the previously proposed instantaneous gas water heater with separate air supply and exhaust system; Figure 2 is a front view of the instantaneous gas water heater equipped with the air supply and exhaust system according to the present invention; Figure 3 is a cross-sectional view taken along the line Y-Y to explain the schematic configuration of the above water heater, Figure 4 is a partially cutaway cross-sectional plan view to explain the main terminal of the same as above, and Figure 5 is a partially cutaway view of Figure 4. The side view and FIG. 6 are perspective views showing an example of an installed state of the instantaneous gas water heater of FIG. 2. 1... Burner body, 2... Heat exchanger,
3... Smoke vent, 4... Burner, 5...
...Blower, 6...Housing, 7...Air supply path, 8...Lid, 8a...Hole, 8b
... Air supply hole, 8c ... Flange, 9.
...Exhaust pipe, 10...End plate, 11...
...Duct, 12...Terminal, 12 a
...Exhaust port, h. 13...exhaust hole, 14...cut and raised piece,
15... Wind shield plate, 16... Support plate, W
...Outer wall, M...Appliance, A...
・Open space, B...Hook-shaped recess in the building, C...
...opening in a building, S...gap.

Claims (1)

[Scope of utility model registration request] A combustor main body is housed in a casing with an open front, the front opening of the casing is sealed with a lid, an air supply hole is provided in the lid, and the combustor is placed in the upper part of the lid. In an air supply/exhaust system for an outdoor forced-air combustion appliance equipped with an oblong exhaust pipe of the same size as the width of the lid that communicates with the flue of the main body, either one of the openings at the left and right ends of the exhaust pipe One opening is sealed with an end plate, and a duct and a terminal having a required length are provided in the other opening in a horizontal manner so as to protrude to the side of the casing, and to protrude outward on all four sides of the peripheral wall of the terminal. A plurality of exhaust holes with cut-and-raised pieces that slope rearward are provided, and a wind shield plate that expands left and right in a V-shape is installed in front of the exhaust port of the terminal via a support plate to direct the exhaust air to the An air supply/exhaust device for a forced ventilation combustion appliance, characterized in that the air is discharged in the side direction of the casing.