JPS6039617Y2 - Forced air combustor supply and exhaust terminal - Google Patents

Description

[Detailed description of the invention] The present invention relates to an air supply/exhaust terminal used in a so-called forced-air combustor that uses a fan to forcefully supply combustion air from outdoors and exhaust combustion exhaust gas outdoors. .

This type of air supply/exhaust terminal is usually inserted into the outer wall W of the combustor indoors B and protrudes horizontally to the outdoors A, as illustrated in FIG.

That is, the exhaust pipe C is concentrically inserted into the feed cylinder a via a support, and the front end of the feed cylinder a is closed with a cover plate d.
A large number of exhaust holes f and air supply holes e are provided on the peripheral wall surface thereof at slight intervals to the rear side thereof, and the rear end is connected to a connecting pipe g provided in the combustor K, and the rear end of the exhaust pipe C is connected to the flue.

By the way, in this type of air supply/exhaust terminal, the area of the air supply/exhaust hole is determined according to the combustion capacity of the appliance, but it is desirable to standardize the shape as much as possible due to installation conditions and wall hole penetration work. Therefore, while keeping the diameter and length constant, an air supply hole e and an air exhaust hole f having an opening area that allows smooth supply and exhaust suitable for the combustion capacity are provided in the extension part protruding to the outdoors A, respectively. There is.

However, in the case of appliances with relatively high combustion capacity such as water heaters, the dimensions of the holes and intervals for supply and exhaust are 1 JIS-5.
212Cs Instant Water Heater (7) Based on Section 4.16, it is stipulated that the diameter should be less than 16cm in order to prevent the intrusion of foreign matter. Supply/exhaust holes will have to be provided, but in order to secure those locations, the horizontal dimensions that protrude into the outdoors A will become longer, and a large number of holes will need to be provided in the restricted area. The air supply hole e and the exhaust hole f come to be close to each other.

When such an extended air supply/exhaust terminal is provided protruding from the outer wall W to the outdoors A, the following problems arise.

Rσ: There are relatively few problems with the combustibility of the appliance when there is no wind or a weak wind, but as the wind becomes strong (wind speed of 8 m/sec or more), the exhaust gas flow on the exhaust side varies. Adversely affect.

For example, (i) when wind blows from the front, all of the exhaust gas coming out of the exhaust hole f is not dissipated into the outside air, and some of the exhaust gas is re-supplied through the air supply hole e, as shown by the solid arrow in Figure 1. This caused incomplete combustion due to the lack of oxygen in the air supply necessary for combustion, resulting in poor combustion conditions.

(ii) When wind blows against a building such as a one-story apartment complex, the air supply and exhaust terminals of each house receive different wind conditions depending on the location of the building, so even if the wind pressure is the same, the wind may blow depending on the location. As a result, the outflow of exhaust gas is blocked, and the pressure P1 in the exhaust stack C becomes higher than the pressure P2 in the combustion chamber, making it impossible to continue combustion.

(iii) Higher temperature than the front exhaust hole f (180°C~2
00'C) is forcibly discharged, and it is unfavorable for fire prevention to be near flammable objects such as buildings and obstacles near this protruding supply and exhaust terminal, so as a condition for installing the supply and exhaust terminal, Due to the restriction that a considerable distance must be maintained from combustible materials,
Even if the installation location of the appliance is determined indoors, there is a problem in that the air supply/exhaust terminal cannot necessarily be installed at the desired location.

(iv) In areas with snowfall, if there is snow on the air supply and exhaust terminals, the air supply holes e and exhaust holes f will be blocked and combustion will not take place because no measures have been taken to prevent this. Sometimes it was impossible.

The present invention is an air supply/exhaust terminal that aims to solve the above-mentioned conventional problems, and at the same time shortens the terminal protrusion toward the outdoors, and at the same time, it can be used under any wind direction and wind speed conditions. , the exhaust gas is not recirculated to the air supply side and air is not supplied, and the outflow of exhaust gas is not suppressed, allowing smooth ventilation, and it can be installed without restrictions even in poor outdoor installation conditions. The present invention also aims to provide an air supply/exhaust terminal that can eliminate the problem of air supply and exhaust holes being blocked during snowfall.

Hereinafter, embodiments of the air supply/exhaust terminal of the present invention will be described with reference to FIGS. 2 to 6.

In FIG. 2 and subsequent figures, the same reference numerals as those shown in FIG. 1 indicate the same parts.

Fig. 2 shows a schematic configuration of a forced air water heater equipped with the air supply/exhaust terminal of the present invention, in which 1 is a combustion chamber of the water heater, and a heat exchanger 2 is installed above the combustion chamber. A flue is provided, a burner 39 is provided with a fan 4 for forced ventilation at the bottom, a control device (not shown) is provided, and the container is housed in a closed container 5.

The flue is provided protruding from the rear of the container casing 5, and penetrates through a through hole H formed at a predetermined position in the outer wall W at the protruding end of a connecting tube g that concentrically projects from the container casing 5 on the outside. It is connected to the inserted air supply/exhaust terminal M (hereinafter simply referred to as the terminal).

Next, based on FIGS. 3 to 6, the terminal M of the present invention
An example of this will be described.

6 is the outer cylinder, and the dimension protruding to outdoor A is 10o at the shortest.
It has a straight cylindrical shape with a length of TIun or more and a maximum length of 30 or IrIn or less, and a vertically elongated hole 7 for rotating a deflection plate 8, which will be described later, is symmetrically bored in the lower half circumference of the outer cylinder 6 near the front end opening. .

The deflection plate 8 is fitted into the front end opening of the outer cylinder 6 so as to be rotatable within a range of inclination angle θ, and has a screw 9 provided in the vertical hole 7.
A plurality of oblong exhaust holes 11 having downward cut-and-raised pieces 10 on the inside are bored in the front surface of the deflection plate 8.

Reference numeral 12 denotes an inner cylinder disposed approximately concentrically within the outer cylinder 6, and its front end opening is located at a required distance behind the deflection plate 8.

13 is a partition plate fixed to the outer periphery of the front end of the inner cylinder 12;
The partition plate 13 closes off the front end of an air supply path 14 formed by the outer cylinder 6 and the inner cylinder 12.

Reference numeral 15 denotes an exhaust chamber defined by the deflection plate 8 and the partition plate 13.

Reference numeral 16 designates a plurality of air supply holes formed at required intervals on the circumferential surface of the lower half of the outer cylinder 6 on the rear side of the exhaust chamber 15.

Reference numeral 17 denotes a half-moon-shaped exhaust cover that protrudes to cover the front upper half of the deflection plate 8, and its rear end is fixed to the front upper part of the outer cylinder 6.

E is a combustible obstacle outdoors A.

Note that the width dimension of the exhaust hole 11 and the air supply hole 16 is 16 mm.
It is set to be less than WIn to prevent foreign matter having a size larger than this from entering.

In addition, the outer cylinder 6, the inner cylinder 12. All the partition plates 13 and the like are joined together by spot welding, and the deflection plate 8 is rotatably fitted in the front of the partition plate 8 and attached with screws 9, and the exhaust cover 17 is attached in a protruding manner to the front upper part of the deflection plate 8. By doing so, the supply/exhaust terminal M is configured.

Next, the supply/exhaust action of the terminal of the present invention having the above-mentioned configuration according to the wind condition will be explained.

First, in the case of no wind or weak wind, the combustion air for the water heater is forcibly drawn into the water heater by the operation of the fan 4 from the air supply hole 6 to the air supply path 14 to the container casing 5 as shown by the broken line arrow, and the combustion air of the burner 3 is Participate in

The high-temperature combustion gas generated by the combustion rises in the combustion chamber 1, loses heat in the heat exchanger 2, becomes exhaust gas, and flows out from the flue to the exhaust pipe 12 to the exhaust chamber 15 as shown by the solid line arrow. be done.

For example, the exhaust gas at this time has a combustion capacity of 26,000 Kca/
/hr water heater No. 13 has a high temperature of about 200℃ and a flow rate of about 8m/sec,
This hits the deflection plate 8 and is decelerated, and due to the bending action of the cut and raised pieces 10, it moves forward and downward from each exhaust hole 11 by 10 degrees.
It becomes a band current over a short distance of about 0 mm and is diluted and dissipated outdoors.

Therefore, in the vicinity of the combustible material E, which is located at a distance of about 150 mm from the terminal M, the temperature drops to a low temperature of about 40°C, and at the same time, the supply air is fresh because it flows without going around to the air supply hole 16 side. .

Next, in windy conditions, if the wind blows against terminal M from the front F1 as shown in Figure 5, the wind is stronger than the outflow pressure of the exhaust gas (approximately 877 L/Sec).
When the exhaust gas (above) is received by the exhaust hole 11, the outflow of exhaust gas from the exhaust hole 11 in the lower half of the deflection plate 8, which directly receives this wind, is suppressed, but the intrusion of the wind into the exhaust chamber 15 is prevented. Piece 1
At the same time, the exhaust gas flows out through the exhaust hole 11 in the upper half of the deflection plate 8 covered with the exhaust cover 17.

That is, the wind hitting the lower half of the deflection plate 8 turns upward as indicated by the arrow (3) and enters the exhaust cover 17, and along with the exhaust gas flow inside, the flow is split and reversed along the curved surface and flows downward.

Then, the exhaust gas flows to the leeward side following a path (white belt arrow) that is a combination of the outflow vector of this exhaust gas flow and the wind vector.

In this case, the air may be slightly mixed with the air supply flow indicated by the dashed arrow above, but at this time, the exhaust gas is sufficiently diffused and mixes with the outside air, resulting in almost the same state as fresh air, and combustion occurs. There is no problem at all.

When the wind blows in the horizontal direction F2 against one half of the terminal M (the right side in the example), the exhaust gas flow from the exhaust hole 11 in the lower half of the deflection plate 8 is in the front direction F as described above. Similarly, the cut and raised piece 10 prevents the wind from entering the exhaust chamber 15, although it is partially suppressed.

At this time, the exhaust gas flowing downward from the exhaust hole 11 side covered by the exhaust cover 17 in the upper half of the deflection plate 8 is sucked in as shown by the arrow @ by the wind velocity flow flowing away below the exhaust cover 17, and is diluted. Since it is dissipated to the leeward side while being absorbed, it does not enter the air supply side.

When the wind blows downward F3 toward the terminal M, the exhaust hole 11 is almost covered by the exhaust cover 17 in projection, so the exhaust gas directly flowing out from the exhaust hole 11 is It flows downward uncontrollably.

At this time, the wind hits the exhaust cover 17 and the wind speed is reduced, and at the same time flows along the curved surface of the exhaust cover 17 as shown by arrow 8, the exhaust gas is guided and diluted by the action of this wind. Since it is dissipated to the leeward side, it does not approach the air supply side at all.

When the wind blows upward F toward the terminal M, the exhaust gas flowing out from the exhaust hole 11 is pushed into the exhaust cover 17 by the blown wind, but this exhaust gas flows as shown by the arrow @. The gas flows in reverse along the curved surface of the exhaust cover 17 and flows outward again.

Since it is diluted and diffused upward, it naturally does not mix into the air supply side.

In addition, if the exhaust hole 11 of the deflector plate 8 is located at the Y line position in FIG. 6, and the result after the exhaust gas flows out is not satisfied due to the location of the building or other outdoor conditions, simply loosen the screw 9. Since the deflection plate 8 can be rotated arbitrarily, the installation of the deflection plate 8 to the terminal M is not restricted by the state as shown in FIG. Just change the direction.

In addition, the above-mentioned exhaust cover 17 is designed so that the wind blows through the exhaust hole 1 when there is wind.
This function not only assists in the outflow of exhaust gas when it is blown onto the exhaust hole 11, but also serves to prevent the exhaust hole 11 from being blocked during snowfall.

As described above, in the terminal of the present invention, a deflection plate having a plurality of oblong exhaust holes with cut and raised pieces on the inside is rotatably fitted into the front end opening of the outer cylinder that protrudes outdoors. An exhaust cover is provided at the top of the front end of the outer cylinder to allow the upper half of the deflection plate to protrude like a cover, and the front end opening of the inner cylinder is positioned at a required distance behind the deflection plate. The outer periphery of the inner cylinder and the inner periphery of the outer cylinder are closed off with a partition plate to form an air supply path and an exhaust chamber, and on the rear side of the exhaust chamber, multiple air supply holes are formed on the circumference of the lower half of the outer cylinder. Because the structure has a perforated structure, the deflection plate and exhaust cover can be rotated according to the wind conditions, not only in no wind or weak winds, but also in windy conditions in any direction. Due to the merging action, the exhaust gas is not recirculated to the air supply hole side, so that supply and exhaust can always be carried out without interfering with combustion.

In addition, the outdoor projecting dimensions of the terminal can be shortened, and the deflector plate and exhaust cover dissipate and dilute the exhaust gas far away, slowing down the outflow speed, and shortening the high-temperature hot air flow flowing forward from the exhaust hole. The conventional extended type air supply/exhaust terminal can be installed in existing buildings from the viewpoint of fire prevention and combustion. It can now be installed in locations where it cannot be installed due to distance constraints due to conditions or the location of combustible materials outdoors, without worrying about fire or non-combustibility, and when it snows, the air supply holes and exhaust holes become blocked, making combustion impossible. You will be freed from the disaster.

The practical effects are particularly great in areas such as overcrowded cities where there are many adjacent houses or multi-layered housing complexes, or areas with heavy snowfall.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway side sectional view showing a conventional air supply/exhaust terminal, Fig. 2 is a schematic configuration diagram showing an embodiment in which the air supply/exhaust terminal of the present invention is installed in a forced air water heater, and Figs.
The figures show an example of the implementation of the air supply/exhaust terminal according to the present invention, in which Fig. 3 is a longitudinal sectional view, Fig. 4 is a front view of the same, Fig. 5 is a perspective view of the same, and Fig. 6 is a perspective view of the same. FIG. 5 is a front view showing a rotating state of the principal deflection plate in FIG. 4; 6... Outer cylinder, 8... Deflection plate, 10...
...Cut and raised piece, 11...Exhaust hole, 12...
... Inner cylinder, 13 ... Partition plate, 14 ...
...Air supply path, 15...Exhaust chamber, 16...
・Air supply hole, 17... Exhaust cover, M...
- Supply and exhaust terminal.

Claims (1)

[Scope of utility model registration request] In a double-cylindrical supply/exhaust terminal with an inner cylinder provided inside an outer cylinder, a deflection plate is provided in the front end opening of the outer cylinder, in which a plurality of oblong exhaust holes having pieces cut and raised inward are bored. An exhaust cover that is rotatably fitted and protrudes to cover the upper half of the deflection plate is attached to the upper front end of the outer cylinder, and the inner cylinder is placed at a required distance on the rear side of the deflection plate. The front end opening of the inner cylinder is positioned, and the space between the outer periphery of the opening of the inner cylinder and the inner periphery of the outer cylinder is closed with a partition plate to form an air supply path and an exhaust chamber, An air supply/exhaust terminal for a forced air combustor, characterized by having multiple air supply holes in the lower half of the cylinder.