JPH08219443A - Exhaust gas gathering tube for combustion device - Google Patents

Abstract

PURPOSE: To contrive cost down by reducing the number of parts as compared with a conventional exhaust gas gathering tube and improve the draining property of rain water invaded into the exhaust gas gathering tube, in the exhaust gas gathering tube for discharging exhaust gas, passed through the heat exchanger of a combustion device such as a gas hot-water supplier and the like into atmosphere after gathering it. CONSTITUTION: An exhaust gas case 2 is constituted of a cover unit 2a, formed so as to have the shape of a hood, and an upper side flange unit 2g, formed integrally with the opening rim of an exhaust gas injecting side of the cover unit 2a by extending it outwardly and bending it. A water cutting plate 4 is provided with a water cutting slanted part 4a, extending from the opening rim side of the exhaust case 2 toward the inside of the cover unit 2a slantingly, while a lower flange unit 4c is formed integrally with the water cutting slanted part 4a by bending it downwardly at a position opposed to the lower surface of the upper side flange unit 2g. An exhaust top 6 is attached directly to respective front surfaces of the upper flange unit 2g of the exhaust case 2 and the lower side flange unit 4c of the water cutting plate 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an exhaust collecting cylinder for collecting exhaust gas passing through a heat exchanger and discharging it into the atmosphere in a combustion apparatus such as a gas water heater.

[0002]

2. Description of the Related Art In a gas water heater as shown in FIG. 5, a gas burner, a heat exchanger, and an exhaust collecting cylinder (none of which are shown) are sequentially arranged in a main body case 100. While heating the heat exchanger with the heat generated by burning the combustible gas, the exhaust gas that has passed through the heat exchanger is collected by the exhaust collecting cylinder on the upper part thereof and discharged into the atmosphere through the upper opening 102 of the main body case 100. It has become.

By the way, as an exhaust collecting cylinder used for such a gas water heater or the like, conventionally, a structure having a structure as shown in FIG. 6 has been provided.

[0004] The exhaust case 1 ₀ is made of molded products such as galvanized steel sheet, an exhaust casing 2 to an exhaust passage of the exhaust gas, to prevent rainwater from entering the exhaust passage It mainly comprises a draining plate 4 and an exhaust top 6 for discharging exhaust gas to the outside of the apparatus.

The above-mentioned exhaust case 2 is provided with a hood-like cover portion 2a which is bulged upward and has an inverted L-shaped cross section along the lower opening edge of the cover portion 2a on the exhaust gas inflow side. The rib portion 2b is formed, and the left and right inner walls of the cover portion 2a facing each other are provided with projections 2d for locking the depth end of the draining plate 4, respectively. Further, the opening edge of the cover portion 2a on the exhaust gas ejection side is projected outward and bent to integrally form a flange mounting portion 2c, and a flat plate-shaped upper flange member 8 is spot-welded to the back surface side of the flange fixing portion 2c. It is fixed by etc. In addition, 9 is a cover portion 2a
L-shaped fittings attached to the left and right outer walls of the exhaust collecting cylinder 1 are fixed to the body case of the device (not shown) by the fittings 9.

Further, the draining plate 4 has a draining inclined portion 4a which gradually extends from the opening edge of the exhaust case 2 on the exhaust gas ejection side toward the inside of the cover portion 2a, and the draining inclined portion 4a is formed as described above. A flange mounting portion 4b is integrally formed by bending downward at a position facing the lower surface of the flange fixing portion 2c, and a flat plate-shaped lower flange member 10 is fixed to the back surface side of the flange mounting portion 4b by spot welding.

A pair of protrusions 2d in the exhaust case 2
Then, the depth end of the draining inclined portion 4a is hooked. in this case,
In the molding process before the draining plate 4 is attached to the exhaust case 2, the draining inclined portion 4a is set to an inclination angle of about 30 °, and the exhaust case 2 is maintained with this inclination angle maintained.
It is hooked and fixed to the left and right protrusions 2d. Therefore, when a machining error occurs in the drainage inclined portion 4a, the left and right projections 2d are hooked while maintaining the above inclination angle (about 30 °), and in this state, the depth end of the drainage inclined portion 4a is retained. Are spot-welded to the left and right inner walls of the exhaust case 2. Further, the exhaust case 2 and the draining plate 4 are fixed to each other by spot welding the base end portion of the draining inclined portion 4a on the flange mounting portion 4b side to the side wall of the cover portion 2a of the exhaust case 2.

In this state, in the exhaust case 2, a vent hole 12 is provided between the depth end of the draining sloped portion 4a and the inner wall of the cover portion 2a of the exhaust case 2 facing the drain end, and the exhaust case 2 is also provided. An exhaust port 13 is formed in a portion surrounded by the flange mounting portion 2c and the flange mounting portion 4b of the draining plate 4.

On the other hand, the exhaust top 6 has a structure in which an opening 6c is formed in the center by projecting a mouth frame 6b forward from the inner peripheral edge of a square frame-shaped base end 6a. 6 are upper and lower flange members 8 via packing 14,
It is fixed by screwing to 10.

In this structure, the exhaust gas that has passed through the heat exchanger (not shown) is guided to and collected by the exhaust case 2 of the exhaust collecting cylinder, passes through the vent hole 12, and then the cover portion 2a and the draining inclined portion 4a. The exhaust gas is exhausted from the exhaust port 13 along the exhaust passage between and, passes through the exhaust top 6, and is discharged into the atmosphere.

Further, even if rainwater passes through the exhaust top 6 and enters the exhaust port 13, it is dammed up by the draining inclined portion 4a of the draining plate 4 and leaks from the ventilation port 12 to the heat exchanger side. It is supposed to be prevented.

[0012]

However, the conventional exhaust stack having the above-mentioned structure has the following problems.

(1) The upper flange member 8 and the lower flange member 10 for mounting the exhaust top 6 are made of separate members from the exhaust case 2 and the draining plate 4, and the upper and lower flange members 8, It is necessary to spot weld 10 to the exhaust case 2 and the draining plate 4, and this increases the number of parts and requires extra labor for assembly, resulting in cost increase.

(2) Rainwater that has passed through the exhaust top 6 and entered the exhaust case 2 through the exhaust port 13 is dammed by the draining inclined portion 4a of the draining plate 4, and this dammed rainwater is exhausted. 2 is soaked into the packing 14 between the exhaust top 6 and the packing 14 so that it flows down to the outside of the device through the packing provided in the main body case of the device.

Therefore, it is necessary to separately attach a drain for draining rainwater to the main body case, which is a factor of cost increase.

The present invention has been made in order to solve the above-mentioned problems. The number of parts is reduced as compared with the prior art to reduce the cost, and the rainwater that has invaded the inside of the exhaust collecting cylinder can be efficiently externalized. The challenge is to be able to drain the water.

[0017]

In order to solve the above-mentioned problems, the present invention provides an exhaust case which constitutes an exhaust passage for exhaust gas, and a draining plate for preventing rainwater from entering the exhaust passage. An exhaust collecting cylinder of a combustion device having an exhaust top for discharging exhaust gas to the outside of the device has the following configuration.

That is, in the exhaust stack of the present invention according to claim 1, the exhaust case is formed with a hood-shaped cover portion, and the opening edge on the exhaust gas ejection side of the cover portion is outwardly directed. And an upper flange portion integrally formed by bending to the upper side, and the draining plate has a draining inclined portion extending inwardly from the opening edge side of the exhaust case toward the inside of the cover portion, and the draining inclined portion is formed on the upper side. The lower flange portion is integrally formed by bending downward at the position facing the lower surface of the flange portion, and the exhaust top is directly attached to each front surface of the upper flange portion of the exhaust case and the lower flange portion of the drain plate. Has been done.

In the exhaust stack of the present invention as set forth in claim 2, the drainage plate has an outer drainage portion in which the lower flange portion is further bent to connect to the drainage inclined portion and pass through the opening portion of the exhaust top. Are formed.

[0020]

In the structure of claim 1, the exhaust case has the upper flange portion and the draining plate integrally formed with the lower flange portion. It can be directly attached to each front surface of the flange portion of the. Therefore, the number of parts is reduced as compared with the conventional case, and the labor such as spot welding can be saved, so that the cost can be reduced.

According to the second aspect of the present invention, the rainwater dammed by the draining inclined portion of the draining plate is drained to the outside from the external drainage portion connected to the draining water through the opening of the exhaust top. For this reason, the drainage of rainwater is improved as compared with the conventional one, and it is not necessary to separately provide a drainage bowl or the like in the main body case of the device, which also contributes to cost reduction.

[0022]

1 is a perspective view of an exhaust collecting cylinder according to an embodiment of the present invention, FIG. 2 is a plan view of the exhaust collecting cylinder excluding the exhaust top of FIG. 1, and FIG. 3 is a front view of the exhaust collecting cylinder of FIG. 4 and 5 are sectional views taken along the line AA of FIG. 3, and the portions corresponding to the conventional technique shown in FIG.

The exhaust collecting cylinder 1 of this embodiment is made of a molded product such as a galvanized steel plate, and prevents the inflow of rainwater into the exhaust case 2 for forming an exhaust passage for exhaust gas and the exhaust passage. The draining plate 4 and the exhaust top 6 for discharging the exhaust gas to the outside of the apparatus are mainly configured.

The exhaust case 2 includes a hood-shaped cover portion 2a which is bulged upward and has an inverted L-shaped cross section along the lower opening edge of the cover portion 2a on the exhaust gas inflow side. The rib portion 2b is formed, and the left and right inner walls of the cover portion 2a facing each other are provided with projections 2d for locking the depth end of the draining plate 4, respectively. Further, the opening edge on the exhaust gas ejection side of the cover portion 2a is projected outward and bent to integrally form an upper flange portion 2g.

Further, a mounting member 15 is fixed to the upper portion of the cover portion 2a by spot welding, and the mounting member 15 is further fixed to a main body case of the device (not shown) via an L mounting member 16.

Further, the draining plate 4 has a draining inclined portion 4a extending from the opening edge of the exhaust case 2 on the exhaust gas ejection side toward the inside of the cover portion 2a, and the depth of the draining inclined portion 4a. The end is curved upward to form a return portion 4f, and both left and right ends of the drainage inclined portion 4a are bent upward to form a waterproof wall portion 4e. On the other hand, the other end of the draining inclined portion 4a is bent downward at a position facing the lower surface of the flange fixing portion 2c, and is bent downward to form the lower flange 4c.
Is further integrally formed, and further, the lower flange portion 4c is further bent to form an external drainage portion 4d which is connected to the draining inclined portion 4a and passes through an opening portion 6c of an exhaust top 6 described later.

The pair of left and right projections 2d in the exhaust case 2 are engaged with the depth end side of the drainage inclined portion 4a, and the left and right side portions on the lower flange portion 4c side of the drainage inclined portion 4a are connected to the exhaust case 2. The exhaust case 2 and the draining plate 4 are integrally fixed to each other by spot welding to the lower surface of the rib portion 2b.

The draining inclined portion 4a of the draining plate 4 is about 30 in a state where it is locked and fixed to the left and right projections 2d of the exhaust case 2.
Although the inclination angle is °, the drain plate 4 is attached to the exhaust case 2
In the state of molding processing before mounting on the
Has an inclination angle of about 20 °. That is, when the draining plate 4 is attached to the exhaust case 2, since it is hooked on the protrusion 2d with a repulsive force so as to maintain an inclination angle of about 30 °, even if a processing error occurs, The drain plate 2 is securely fixed to the exhaust case 2. Therefore, it is not necessary to perform spot welding or screwing the waterproof wall portion 4e of the draining plate 2 to the inner wall of the exhaust case 2, and it is possible to save the labor of mounting.

In this state, in the exhaust case 2, a vent hole 12 is provided between the depth side return portion 4f of the draining inclined portion 4a and the inner wall of the cover portion 2a of the exhaust case 2 which faces the drain portion. The exhaust port 1 is provided in a portion surrounded by the upper flange portion 2g of the exhaust case 2 and the lower flange portion 4c of the draining plate 4.
3 are formed respectively.

On the other hand, the exhaust top 6 has a structure in which an opening 6c is formed in the center by projecting a mouth frame 6b forward from the inner peripheral edge of a square frame-shaped base end 6a. 6 is screwed and fixed to the upper and lower flange portions 2g, 4c via a packing 14.

In the above structure, the upper flange portion 2g and the lower flange portion 4c are integrally bent and formed in the exhaust case 2 and the draining plate 4, respectively.
Can be directly attached to the front surfaces of the upper and lower flange portions 2g and 4c. Therefore, the number of parts is reduced as compared with the conventional case, and the labor such as spot welding can be saved, so that the cost can be reduced.

Further, even when rainwater enters the exhaust port 1 through the opening 6c of the exhaust top 6, not only the return portion 4f on the depth end side of the draining slope 4a of the draining plate 4 but also the draining slope 4a.
Since the rainwater can be reliably stopped by the waterproof wall portions 4e on the left and right of a, the vent hole 12 does not flood outside the heat exchanger.

In addition, the rainwater dammed up by these is drained to the outside from the water drain slope 4a through the external drain 4d. For this reason, the drainage of rainwater is improved as compared with the conventional one, and it is not necessary to separately provide a drainage bowl or the like in the main body case of the device, which also contributes to cost reduction.

In this embodiment, the external drainage portion 4d is formed on the draining plate 4, but the external drainage portion 4d is omitted and the draining inclined portion 4a is formed in order to reduce the number of parts as compared with the prior art. It is also possible to bend downward on the exhaust port 13 side and integrally form only the lower flange 4c.

[0035]

According to the present invention, the following effects can be obtained.

(1) In the structure according to claim 1, since the exhaust case is integrally formed with the upper flange portion and the drain plate with the lower flange portion, the exhaust top is It can be directly attached to each front surface of these upper and lower flange portions. Therefore, the number of parts can be reduced as compared with the conventional one, and the labor for spot welding and the like can be saved, so that the cost can be reduced.

(2) According to the second aspect of the present invention, the rainwater dammed by the draining inclined portion of the draining plate is drained to the outside from the external drainage portion connected to this through the opening of the exhaust top. . For this reason, the drainage of rainwater is improved as compared with the conventional one, and it is not necessary to separately provide a drainage bowl or the like in the main body case of the device, which also contributes to cost reduction.

[Brief description of drawings]

FIG. 1 is a perspective view of an exhaust collecting cylinder according to an embodiment of the present invention.

FIG. 2 is a plan view of the exhaust collecting cylinder in FIG. 1 excluding an exhaust top.

FIG. 3 is a front view of the exhaust stack of FIG.

4 is a sectional view taken along the line AA of FIG.

FIG. 5 is a front view of the gas water heater.

FIG. 6 is a perspective view of a conventional exhaust collecting cylinder.

[Explanation of symbols]

1 ... Exhaust collecting cylinder, 2 ... Exhaust case, 2a ... Cover part, 2g
… Upper flange part, 4… Drain plate, 4a… Drain slope part, 4c
… Lower flange part, 4d… External drainage part, 4e… Waterproof wall part,
6 ... Exhaust top, 6c ... Opening.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Tomohiko Shirotani 32 Akashi-cho, Chuo-ku, Kobe-shi, Hyogo In stock company Noritsu (72) Inventor Saichiro Hato 32 Akashi-cho, Chuo-ku, Kobe-shi Hyogo Stock company Noritsu (72) Inventor Atsushi Yoshimoto 32 Akashi-cho, Chuo-ku, Kobe-shi, Hyogo In stock company Noritsu

Claims (2)

[Claims] 1. A combustion apparatus comprising an exhaust case forming an exhaust gas exhaust passage, a draining plate for preventing rainwater from entering the exhaust passage, and an exhaust top for discharging the exhaust gas to the outside of the apparatus. In the exhaust collecting cylinder, the exhaust case has a cover portion formed in a hood shape, and an opening edge of the cover portion on the exhaust gas ejection side is projected outward and bent to integrally form an upper flange portion. The draining plate has a draining sloped portion that extends inwardly from the opening edge side of the exhaust case toward the inside of the cover portion, and the draining sloped portion is bent downward at a position facing the lower surface of the upper flange portion. A flange portion is integrally formed, and the exhaust top is configured to be directly attached to each front surface of the upper flange portion of the exhaust case and the lower flange portion of the drain plate. Exhaust case of a combustion apparatus according to claim. 2. The combustion device according to claim 2, wherein the drain plate has a lower flange portion further bent to form an external drainage portion which is connected to the drainage inclined portion and passes through an opening portion of the exhaust top. Exhaust collector of the device.