JPH0384311A - Exhaust gas hood of gas burner - Google Patents

Abstract

PURPOSE:To prevent fallings down such as dusts, etc. from entering the inside of a device by providing a folding-back section that is shaped substantially a half circle at the end of an exhaust gas hood and piercing an exhaust gas opening in the upper end section that overlaps the lower end piece of said folding-back section. CONSTITUTION:Since an exhaust gas opening 2 that is pierced into the upper end section 1b of the folding-back section 1 of the end of an exhaust gas hood A overlaps the lower end piece 1a, the lower section of the exhaust gas opening 2 is closed by the lower end piece 1a, and since the upper plate 6 and the lower end piece 1a of the exhaust gas hood A that is connected to the exhaust gas opening 2 completely cover the upper exhaust gas opening 3 of a casing B, it is possible to prevent dusts, etc. that fall down from going into a device body, namely among the fins of a heat exchanger 8, etc. And, the upper end section 1b that overlaps the lower end piece of the folding-back section 1 of the end of the exhaust gas hood A is made the exhaust gas openings 2, the resistance of the exhaust gas is the same as before even if the height of the exhaust gas hood A is lowered, and the front half section of the combustion exhaust gas flow from the upper exhaust gas opening 3 of the casing B is led to a lower exhaust gas channel 7b and discharged smoothly obliquely upwards towards the front of the device and the rear half section is led to an upper exhaust gas channel 7a and discharged obliquly upwards towards the front of the device from the exhaust gas opening 2.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an exhaust hood for a gas combustor such as an indoor open gas water heater.

[Conventional technology]

The performance of the exhaust hood in a gas combustor such as an indoor open gas water heater is to cover the upper part of the upper exhaust opening of the casing to prevent falling objects such as dust from entering the casing, and to direct combustion exhaust heat upward. ■ To prevent the equipment from being overheated by exhausting the gas, ■ To be able to smoothly guide and exhaust the combustion exhaust gas from the upper exhaust opening of the casing diagonally upward, ■
It is important that the height of the exhaust hood is low.

A conventional exhaust hood of this type includes, for example, as shown in FIG. Although the above performance of ■ and ■ is satisfied, the above performance of ■ is insufficient because H''' = i70 mm is required.Therefore, as shown in Fig. 6, the exhaust hood A'' The front end of the top plate 6'' is made by a certain dimension compared to the conventional exhaust hood A (for example, l'Z40I
III11) After cutting it out and conducting an experiment, it was found that it was possible to satisfy the performance of (2) above, and to make H''!=;50rII!Q approximately, which also satisfied the performance (2) above.

Therefore, this invention applies the experimental results to the above-mentioned
The present invention aims to provide an exhaust hood for a gas combustor that satisfies the performance (1) and also satisfies the performance (2) above.

[Means to solve the problem]

In order to achieve the above object distantly, the exhaust hood for a gas combustor of the present invention is an exhaust hood for an indoor open type gas combustor, in which a substantially semicircular folded portion is provided at the tip of the exhaust hood,
It is characterized in that an exhaust port is provided in the upper end portion of the folded portion that overlaps with the lower end piece.

[For production]

In the exhaust hood for a gas combustor according to the present invention configured as described above, the exhaust port at the folded end portion of the exhaust hood overlaps the lower end piece, so that the upper exhaust opening of the casing is connected to the lower end piece. Since it is completely covered with the top plate of the exhaust hood, it is possible to prevent falling objects such as dust from entering the vessel.

In addition, since the exhaust port is drilled in the upper end that overlaps with the folded part, the overall exhaust resistance is reduced, and the height of the exhaust hood can be reduced to 50 degrees under the same conditions as before. . Therefore, the first half of the combustion exhaust gas flow from the upper exhaust opening of the casing is smoothly RH discharged diagonally forward and upward from the lower exhaust passage, and the latter half is smoothly guided and discharged diagonally forward and upward from the upper exhaust passage. The height of the exhaust hood can be lowered by about 20L111 compared to the conventional model while maintaining the exhaust performance.

〔Example〕

Embodiments of the exhaust hood for a gas combustor according to the present invention will be described below with reference to the drawings.

The illustrated example is a small stop-off type gas water heater that is installed and used indoors such as a kitchen, and is applied to the exhaust hood of an indoor open type gas water heater that releases combustion exhaust gas indoors. In FIGS. 1 to 4, A covers the upper part of the upper exhaust opening 3 of the casing B, guides the flow of combustion exhaust gas from the exhaust opening 3 forward and upward, and uses the combustion exhaust heat to protect objects. This is an exhaust hood for preventing overheating of the exhaust hood A.It is formed of a plate-shaped body, the tip of which is folded downward in an arc shape, and a folded part 1 having a hook-shaped cross section is integrally attached to the tip of the exhaust hood A. A mounting leg 4 is integrally provided at the base end, and heavy edges 5 are integrally formed at both ends. 2 is an upper end portion 1 that overlaps the lower end piece 1a of the folded portion 1;
With the exhaust port drilled in b, this overlapping part l is the exhaust hood A.
If the length L in the front-rear direction is 100 mm, it is preferable to set it to about 30 mm in consideration of exhaust gas passage resistance, etc. In this case, the height H of the exhaust hood A may be approximately 50 mm. In addition, since the width of the exhaust hood A is about 232a, if the exhaust port 2 is divided into two by the central partition plate 1c as in the embodiment, the central partition plate 1c will combine with the double edges 5 on both sides to form the exhaust hood A. , so the thickness of exhaust hood A is set to 0,
It can be about 4 mm.

The exhaust hood A having the above configuration is installed on the upper back side of the casing B by attaching the base end mounting legs 4 to the upper part of the upper exhaust opening 3 of the casing B, and connects the upper part of the upper exhaust opening 3 of the casing B to the lower end piece 1a of the tip folded part 1 for exhaust air. The upper exhaust opening 3 of the casing B is completely covered with the upper surface plate 6 of the hood A, and the vicinity of the exit of the exhaust passage 7 is partitioned by the lower end piece 1a of the folded part 1 into an upper exhaust passage 7a and a lower exhaust passage 7b. The first half of the combustion exhaust gas flow is guided to the lower exhaust passage 7b, and the latter half is guided to the upper exhaust passage 7a. It is preferable that the lower end piece 1a of the folded portion 1 and the upper surface plate 6 of the exhaust hood A be sloped slightly backward as in the embodiment in order to reduce resistance to passage of exhaust gas.

In addition, 8 in the figure is a heat exchanger, which is provided at the upper part of the inner shell 9.
The combustion exhaust gas flow from the heat exchanger 8 is directed through the upper exhaust opening 3 of the casing B into the exhaust passage 7. Reference numeral 10 denotes a gas burner, which is provided at the lower part of the inner shell 9, and heats the heat exchanger 8 with the gas burner 10 to heat and raise the temperature of the water flowing through the heat exchanger 8, thereby generating hot water from the hot water faucet 1.
The hot water starts from 1. 12 is a pushbutton operation button,
13 is a water supply pipe, and 14 is a gas supply pipe. Furthermore, the casing B is divided into two parts so that the front casing 16 can be worn freely with respect to the wall casing 15.

In the above configuration, the exhaust port 2 bored in the upper end portion 1b of the tip folded portion 1 of the exhaust hood A overlaps the lower end piece 1a, so the lower part of the exhaust port 2 is blocked by the lower end piece 1a, and the exhaust port 2 Since the upper surface plate 6 of the exhaust hood A and the lower end piece 1a completely cover the upper exhaust opening 3 of the casing B, dust and other objects falling from above are trapped inside the vessel, that is, the heat exchanger 8.
can be prevented from entering between the fins, etc.

In addition, since the upper end portion 1b of the exhaust hood A, which overlaps with the lower end piece of the folded end portion 1 of about 30 cm, is used as the exhaust port 2, the exhaust resistance is lower than that of the conventional one even if the height of the exhaust hood A is as low as about 50 cm. It is almost the same as the upper exhaust opening 3 of casing B.
The first half of the combustion exhaust gas flow is guided to the lower exhaust passage 7b and smoothly discharged diagonally upward outside the device (see arrow a in Figure 4), and the latter half of the combustion exhaust gas flow is guided to the lower exhaust passage 7b. 7a, and is smoothly discharged from the exhaust port 2 diagonally upward and forward outside the vessel (see the arrow in FIG. 4).

〔Effect of the invention〕

As explained above, in this invention, a substantially semicircular folded part is provided at the tip of the exhaust hood, and an exhaust port is bored in the upper end portion that overlaps with the lower end piece of the folded part, so that the upper exhaust opening of the casing is located at the lower end of the folded part. Because it is completely covered by the top plate of the exhaust hood, it prevents falling objects such as dust from entering the chamber, and also allows the height of the exhaust hood to be lowered while maintaining exhaust performance. There is.

[Brief explanation of drawings]

Fig. 1 is a front view showing an embodiment of the exhaust hood of a gas combustor according to the present invention, Fig. 2 is a partially cutaway side view, Fig. 3 is a plan view of only the exhaust hood, and Fig. 4 is the main part. FIG. 5 is an enlarged sectional view of the main part of the conventional example, and FIG. 6 is an experimental sectional view. A...Exhaust hood, 1...Folded portion, 1a...Lower end piece, 1b...Upper end portion, 2...Exhaust port. 0

Claims (1)

[Claims] In the exhaust hood of an indoor open type gas combustor, a substantially semicircular folded part (1) is provided at the tip of the exhaust hood (A),
The upper end portion (
1b) An exhaust hood for a gas combustor, characterized in that an exhaust port (2) is provided in the exhaust hood.