JP2000054690A - Chimney - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve a function by providing a cross section inverse V shape coping for wind turn along an outer cylinder top part as well as making height of an outer cylinder to cover an outer periphery of an inner cylinder roughly the same as the inner cylinder. SOLUTION: A chimney 1 is constituted by making height of an outer cylinder 3 to surround a plural number of inner cylinders 2 roughly the same as height of the inner cylinder 2 and providing a cross section inverse V shape coping 4 for wind turn along a top part of the outer cylinder 3. Thereafter, when cross wind blows at the top part of the outer cylinder 3, wind toward the outer cylinder 3 hits the inverse V shape coping 4 provided on the top part of the outer cylinder 3, and a direction of a flow is changed upward. Additionally, even when a part of the wind is not directionally changed and flows in the direction of the coping 4 in the downstream of the outer cylinder 3 accompanying smoke emitted from the inner cylinder 2, it hits the coping 4 again and the direction of the flow is changed upward. Consequently, it is possible to prevent occurrence of down wash as smoke swallowed in a descending current and to keep a sense of beauty as height of the outer cylinder is made roughly the same as the inner cylinder.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a chimney comprising an inner cylinder and an outer cylinder, and more particularly to a chimney capable of preventing downwash.

[0002]

2. Description of the Related Art When there are a plurality of chimneys having a high height, such as a chimney in a cleaning plant, an outer cylinder surrounding two or three chimneys (hereinafter referred to as inner cylinders) discharging smoke from an aesthetic point of view. Is provided to make the inner cylinder invisible. The height of the outer cylinder is the same as the height of the hollow inner cylinder.

From an aesthetic point of view, the height of the outer cylinder may be higher than the height of the inner cylinder. However, if the outer cylinder is high, when the cross wind blows at the top of the outer cylinder, the wind passes through the outer cylinder. In the area, the smoke accompanying the crosswind is caught in the downdraft, and a phenomenon called downwash occurs in which the top of the outer cylinder is contaminated with the smoke.

[0004] Conversely, if the height of the outer cylinder is made smaller than the height of the inner cylinder, downwash can be prevented, but this is not preferable from the viewpoint of aesthetics.

Japanese Patent Laid-Open Publication No. Hei 6-66051 discloses a technique relating to a chimney that simultaneously satisfies both prevention of downwash and maintenance of the scenery.

This chimney has a breathable wall surrounding the outer periphery of the inner cylinder and having a height substantially equal to that of the inner cylinder at the top of the outer cylinder covering the outer periphery of the inner cylinder. For example, the air-permeable wall has a structure in which narrow flat-plate-shaped louvers are vertically arranged, or a structure in which narrow flat-plate-shaped louvers are horizontally arranged. Things are shown. And Lou
By properly setting the bar height and the aperture ratio, the downwash phenomenon can be effectively reduced.

[0007]

However, the chimney disclosed in JP-A-6-66051 described above has
There are the following problems.

[0008] The wind entering the outer cylinder from the upstream side of the outer cylinder not only changes its direction toward the upper part of the outer cylinder, but also partially turns horizontally from the louver located downstream of the outer cylinder. There is a possibility that it will blow through, and it is not perfect as a measure to prevent downwash.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems of the prior art, and has as its object to provide a chimney capable of completely preventing downwash.

[0010]

The chimney according to the present invention comprises:
The height of the outer cylinder that covers the outer periphery of the inner cylinder is substantially the same as the height of the inner cylinder, and an inverted V-shaped cross section is provided along the top of the outer cylinder.

In this chimney, the height of the outer cylinder is the same as the height of the inner cylinder, so that the appearance can be maintained.

Further, generation of downwash caused by making the outer cylinder the same height as the inner cylinder can be prevented as follows.

[0013] When a cross wind is blowing at the top of the outer cylinder, the wind heading for the outer cylinder hits an inverted V-shaped cap provided at the top of the outer cylinder.
The direction of flow is diverted upward. Also, some wind does not change direction, accompanied by smoke discharged from the inner cylinder,
Even if the water flows in the direction of the shade on the downstream side of the outer cylinder, the flow hits the shade again and the flow direction is changed upward. Therefore, downwash does not occur due to the smoke being caught in the downdraft.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described with reference to the drawings. 1A is a plan view showing a chimney according to an embodiment of the present invention, FIG. 1B is a cross-sectional view taken along a line AA in FIG. 1A, and FIG. It is a part enlarged view. The height of the outer cylinder 3 surrounding the two inner cylinders 2 is
The height of the outer cylinder 3 is substantially the same as that of the outer cylinder 3, and a wind-turning cap 4 having an inverted V-shaped cross section is provided along the top of the outer cylinder 3.

In this chimney 1, when a cross wind is blowing at the top of the outer cylinder 3, the wind heading for the outer cylinder 3 hits the inverted V-shaped cap 4 provided at the top of the outer cylinder 3, and the flow direction is upward. Be converted. Further, even if a part of the wind does not change direction but flows along the shade 4 on the downstream side of the outer cylinder 3 with the smoke discharged from the inner cylinder 2, the wind again strikes the shade 4 and the flow The direction is turned upward. Therefore, downwash does not occur due to the smoke being caught in the downdraft.

Since the height of the outer cylinder 3 is substantially equal to the height of the inner cylinder, an aesthetic appearance can be maintained.

The size of the cap 4 is determined by setting the thickness of the outer cylinder 3 to C.
In this case, the dimensions of D and H shown in FIG. 1C should be the same as the dimensions of C.

[0018]

According to the present invention, downwash can be prevented without impairing the appearance.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of a chimney according to an embodiment of the present invention;
(A) is a plan view, (b) is an AA cross-sectional view of (a),
(C) is an enlarged view of a portion B in (b).

[Explanation of symbols]

 1 Chimney 2 Inner cylinder 3 Outer cylinder 4 Kasagi

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Katsunori Kurabe, 1-2-1, Marunouchi, Chiyoda-ku, Tokyo, Japan Inside Nihon Kokan Co., Ltd. (72) Inventor Kazuyo Seo 1-2-1, Marunouchi, Chiyoda-ku, Tokyo, Japan (72) Inventor Katsutoshi Yoshida 1-2-1, Marunouchi, Chiyoda-ku, Tokyo, Japan Nihon Kokan Co., Ltd. (72) Noriaki Okamoto 1-2-1, Marunouchi, Chiyoda-ku, Tokyo, Japan Co., Ltd. (72) Inventor Hiroshi Masuda 1-2-1, Marunouchi, Chiyoda-ku, Tokyo Nihon Kokan Co., Ltd.

Claims (1)

[Claims] 1. The method according to claim 1, wherein the height of the outer cylinder covering the outer periphery of the inner cylinder is substantially the same as the height of the inner cylinder, and a wind-return shelter having an inverted V-shaped cross section is provided along the top of the outer cylinder. Chimney characterized.