JP7565094B2 - chimney - Google Patents

Description

The present invention relates to a chimney, and in particular to a chimney suitable for processing high-velocity exhaust flow while suppressing the inflow of rainwater into the chimney body during rainfall.

Figure 5 is a schematic diagram showing a conventional example of a chimney. This chimney 100 has a cover plate 20 arranged above the discharge port 11 at the top of the cylindrical chimney body 10, with a space S between them, and the space S is surrounded by a frame body 50 made of louvers. In the chimney 100 with such a configuration, the cover plate 20 covers the entire discharge port 11 of the chimney body 10 from above, and exerts the effect of suppressing rainwater caused by rainfall from falling and flowing into the rising flue 12 of the chimney body 10. In addition, the frame body 50 made of louvers exerts the effect of discharging the exhaust flow discharged from the discharge port 11 of the chimney body 10 and blocked by the cover plate 20 to the outside as shown by the arrow F1, and the effect of preventing birds and the like from entering the rising flue 12 through the discharge port 11 of the chimney body 10.

In contrast to these conventional examples, Prior Example 1 (Patent Document 1) describes a chimney exhaust top in which a top plate is placed above the chimney exhaust port across an exhaust space, and an inner tube is placed above the top plate or within the exhaust space. It is explained that this chimney exhaust top prevents rainwater from entering the chimney with the inner tube. Another Prior Example 2 (Patent Document 2) describes a windbreak device for the tip of a chimney in which two truncated cone-shaped straightening visors are attached to the tip of a cylindrical base in two layers, one above the other, and a windbreak visor is attached on top of the straightening visors. The top plate shown in Prior Example 1 covers the top of the chimney exhaust port, and the windbreak visor shown in Prior Example 2 covers the top of the top of the cylindrical base.

By the way, there are "low-speed exhaust chimneys" with performance suitable for low-speed exhaust flow and "high-speed exhaust chimneys" with performance suitable for high-speed exhaust flow, depending on the speed of the exhaust flow flowing through the flue. Low-speed exhaust chimneys are known to have the performance to handle exhaust flows with a flow speed of 5 to 15 m/sec, and high-speed exhaust chimneys are known to have the performance to handle exhaust flows with a flow speed of 25 to 40 m/sec. On the other hand, whether it is a low-speed exhaust chimney or a high-speed exhaust chimney, in a chimney that discharges an exhaust flow from an outlet, it is desirable to take measures to prevent rainwater from falling into the rising flue 12 of the chimney body 10 during rainfall. Therefore, in the past, as in the conventional example shown in Figure 5, the upper part of the outlet 11 of the chimney body 10 is covered with a cover plate 20 to prevent rainwater from falling into the rising flue 12 of the chimney body 10. The top plate shown in the above-mentioned prior example 1 and the windbreak umbrella shown in prior example 2 are thought to have the same effect as the cover plate 20 of the conventional example shown in Figure 5.

JP 2015-68551 A (FIGS. 1, 4, 0032, 0044) JP 2005-69659 A

However, in a chimney used in an emergency power generation system for a building, if a cover plate 20 is placed above the discharge port 11 of the chimney body 10 to cover the entire discharge port 11 as in the conventional example shown in Figure 5, it is possible to prevent rainwater from falling into the rising flue 12 of the chimney body 10, but on the other hand, the cover plate 20 blocks the upward flow of the exhaust air discharged from the discharge port 11 of the chimney body 10. As a result, even if the exhaust air flow is discharged outward as shown by the arrow F1 in Figure 5 due to the function of the frame body 50 made of louvers, the overall exhaust performance of the chimney 100 may decrease, and sufficient exhaust efficiency may not be obtained. The same can be said for the chimneys shown in Prior Examples 1 and 2.

The present invention has been made in consideration of the above circumstances, and aims to provide a chimney that can prevent rainwater from falling into the chimney body by using a cover plate 20 arranged above the outlet of the chimney body, while taking measures to limit the blocking of the upward flow of the exhaust flow released from the outlet of the chimney body by the cover plate, thereby minimizing the decrease in exhaust performance caused by the installation of a cover plate and achieving satisfactory exhaust efficiency. Therefore, the present invention particularly aims to provide a chimney that can prevent the decrease in exhaust efficiency in the high-velocity exhaust chimney described above.

The chimney according to the present invention comprises a cover plate disposed above the discharge port of a cylindrical chimney body with a space therebetween, the cover plate being formed in an umbrella shape with an outward downward slope, and a cylinder having an exhaust flow escape port at its upper end and opening the space to the outside air through an internal flow path is erected in the center of the cover plate, so that a path is formed in which the exhaust flow coming out of the discharge port of the chimney body rises without bending through the space and is released straight upward from the exhaust flow escape port of the cylinder in the center of the cover plate .

According to a chimney having this configuration, the cover plate prevents rainwater from falling and flowing into the outlet of the chimney body. In addition, the cylinder that is raised on the cover plate helps to release the upward flow of the exhaust air discharged from the outlet of the chimney body into the outside air through its internal flow path, so the situation in which the upward flow of the exhaust air is blocked by the cover plate is limited, and the reduction in exhaust performance (exhaust efficiency) caused by the installation of the cover plate is kept to a minimum. Furthermore, because the cover plate is formed in an umbrella shape with an outward downward slope, the exhaust air discharged into the space above the outlet of the chimney body easily flows into the internal flow path of the cylinder along the cover plate. Therefore, not only is the upward flow of the exhaust air smoothly released into the outside air through the cylinder, but even if rainwater falls into the internal flow path of the cylinder, it collides with the inner surfaces of the cylinder and the cover plate, and then runs down those inner surfaces, making it difficult for it to flow into the inside of the chimney body.

In the present invention, it is desirable that the opening area of the exhaust flow escape port is smaller than the opening area of the discharge port of the chimney body. By adopting this configuration, it becomes easier to achieve a good balance between the effect of preventing rainwater from falling into the discharge port of the chimney body and the effect of preventing a decrease in exhaust efficiency caused by the cover plate blocking the exhaust flow.

In the present invention, it is desirable that the annular lower edge of the cover plate is positioned outside the edge of the outlet of the chimney body. In this way, even if rainwater falls into the internal flow path of the cylinder, it will collide with the inner surface of the cylinder and the cover plate, and then run down those inner surfaces to fall outside the outlet of the chimney body.

In the present invention, the above-mentioned space between the above-mentioned discharge port of the chimney body and the cover plate is surrounded by a frame body made of louvers that has exhaust performance capable of discharging the exhaust flow outward, so that a path is formed in which the exhaust flow coming out of the discharge port of the chimney body passes through the space surrounded by the frame body made of louvers and is curved and discharged outward of the frame body . In this way, the action of the frame body made of louvers not only discharges the exhaust flow discharged from the upper discharge port of the chimney body outward, but also prevents birds and the like from entering the above-mentioned space.

In the present invention, it is desirable that the cylinder has a rising height that allows rainwater that falls into the exhaust flow escape port at an angle of more than 45 degrees to the vertical to collide with the inner surface of the cylinder. By adopting this configuration, even if rainwater falls into the internal flow path of the cylinder at an angle of more than 45 degrees to the vertical, the rainwater will run down the inner surface of the cylinder and the inner surface of the cover plate after colliding with the inner surface of the cylinder.

As explained above, according to the chimney of the present invention, the cover plate arranged above the outlet of the chimney body prevents rainwater from flowing into the chimney body during rainfall, while limiting the upward flow of the exhaust air discharged from the outlet of the chimney body from being blocked by the cover plate. This makes it possible to minimize the decrease in exhaust performance (exhaust efficiency) caused by providing a cover plate while preventing rainwater from flowing into the chimney body, and it is possible to provide a chimney that is particularly useful for preventing the decrease in exhaust efficiency in the high-velocity exhaust chimney described at the beginning.

FIG. 1 is a schematic configuration diagram of a chimney according to an embodiment of the present invention. FIG. FIG. 11 is a plan view of a cover plate according to a modified example. FIG. 2 is a schematic diagram for explaining a favorable dimensional relationship between each part of the chimney. FIG. 1 is a schematic diagram showing a conventional chimney.

Figure 1 is a schematic diagram of a chimney according to an embodiment of the present invention. This chimney 100 has a cover plate 20 arranged above the discharge port 11 at the top of the cylindrical chimney body 10, with a space S between them, and the space S is surrounded by a frame body 50 made of louvers. In the chimney 100 with such a configuration, the cover plate 20 covers the discharge port 11 of the chimney body 10 from above, and acts to prevent rainwater from falling and flowing into the rising flue 12 of the chimney body 10 during rainfall. In addition, the frame body 50 made of louvers acts to discharge the exhaust flow discharged from the discharge port 11 of the chimney body 10 and blocked by the cover plate 20 outward as shown by the arrow F1, and acts to prevent birds and the like from entering the space S.

In this chimney 100, the cover plate 20 is formed in an umbrella shape with an outward downward gradient. A cylinder 21 is raised in the center of the cover plate 20. This cylinder 21 is provided with an exhaust flow escape port 22 at the upper end and an internal flow path 23, and the space S is opened to the outside air through these internal flow path 23 and the exhaust flow escape port 22. Therefore, among the exhaust flows discharged into the space S above the discharge port 11 through the rising flue 12 of the chimney body 10, the exhaust flows that are not discharged to the outside of the frame body 50 smoothly flow into the internal flow path 23 of the cylinder 21 along the cover plate 20 as shown by the arrow F2, and are discharged from the exhaust flow escape port 22 into the outside air. This action suppresses the deterioration of exhaust performance caused by the provision of the cover plate 20. Furthermore, rainwater may fall into the internal flow passage 23 of the cylindrical body 21 during rainfall, but even if rainwater does fall, it collides with the inner surfaces of the cylindrical body 21 and the cover plate 20 and runs down these inner surfaces, so the amount of rainwater that falls and flows into the inside of the chimney body 10 is reduced. Also, the exhaust flow is released into the outside air from the exhaust flow escape port 22, so that the space S can be made smaller. Specifically,
It is possible to reduce the distance between the discharge port 11 and the cover plate 20, thereby making it possible to reduce the number of parts of the frame 50 consisting of louvers surrounding the space S.

The opening area of the exhaust flow escape 22 of the tube 21 provided on the cover plate 20 is smaller than the opening area of the discharge port 11 of the chimney body 10. If the opening area of the exhaust flow escape 22 is too large, rainwater will easily fall into the inside of the cover plate 20 during rainfall, and if the opening area of the exhaust flow escape 22 is too small, the amount of exhaust released into the outside air from the exhaust flow escape 22 will be too small, making it difficult to suppress the deterioration of exhaust performance. For these reasons, the opening area of the exhaust flow escape 22 should be appropriately determined based on the opening area of the discharge port 11 of the chimney body 10.

The lower edge 24 of the cover plate 20 is located outside the edge of the outlet 11 of the chimney body 10. With this configuration, rainwater that falls into the internal flow path 23 of the cylinder 21 as shown by arrow W1 hits the inner surfaces of the cylinder 21 and the cover plate 20, then runs down those inner surfaces as shown by arrow W2 and falls to the outside of the outlet 11 of the chimney body 10, significantly reducing the amount of rainwater that flows into the inside of the chimney body 10 during rainfall.

In this embodiment, the cylinder 21 has a rising height that allows rainwater that falls into the exhaust flow escape port 22 at an inclination angle of more than 45 degrees with respect to the vertical to collide with the inner surface of the cylinder 21. Therefore, when the rainwater falling angle θ1 shown in FIG. 1 is greater than 45 degrees, almost all of the falling rainwater will collide with the inner surface of the cylinder 21 and then run down the inner surface of the cylinder 21 and the inner surface of the cover plate 20. In contrast, when the rainwater falling angle θ1 is less than 45 degrees, only a portion of the rainwater will collide with the inner surface of the cylinder 21 and then run down the inner surface of the cylinder 21 and the inner surface of the cover plate 20.

Figure 2 is a plan view of the cover plate 20, and Figure 3 is a plan view of a modified cover plate 20. The cover plate 20 shown in Figure 2 is formed in a circular umbrella shape when viewed from above, and the tubular body 21 is a cylindrical body. This cover plate 20 is suitable for combination with a cylindrical chimney body 10. In contrast, the cover plate 20 shown in Figure 3 is formed in a square umbrella shape when viewed from above, and the tubular body 21 is a square tubular body. This cover plate 20 is suitable for combination with a square tubular chimney body 10.

Fig. 4 is a schematic diagram for explaining the preferable dimensional relationship of each part, such as the aperture D of the chimney body 10, in the chimney 100 having the configuration shown in Fig. 1. The chimney 100 in the figure is intended for a high-speed exhaust chimney capable of handling an exhaust flow with a flow velocity of 25 to 40 m/sec, and below, a specific example of the preferable dimensional relationship of each part when the aperture D of the cylindrical chimney body 10 is set to 1000 mm will be explained.

In a high-velocity exhaust chimney, the opening area of the exhaust flow escape port 22 of the tube body 21 provided in the cover plate 20 is preferably 10 to 15% of the opening area of the diameter D of the discharge port 11 of the chimney body 10, and for this reason, the diameter D1 of the exhaust flow escape port 22 of the tube body 21 is set to 350 mm.

In a high-velocity exhaust chimney, the height H1 of the frame 50 made of louvers is appropriately about 500 mm. This is because when the height H1 of the frame 50 is about half the diameter D of the chimney body 10, the exhaust flow discharged from the discharge port 11 of the chimney body 10 and partially blocked by the cover plate 20 can be effectively discharged to the outside. In addition, the height H2 of the umbrella-shaped part of the cover plate 20 is appropriately about 200 to 800 mm in this embodiment. The umbrella-shaped cover plate 20 has an outward downward slope, and it is desirable that the inclination angle θ2 of this outward downward slope is greater than 45 degrees. If the inclination angle θ2 is set to an angle greater than 45 degrees, rainwater that falls inside the cover plate 20 will easily run down the inner surface of the cover plate 20, which helps to minimize the occurrence of a situation in which rainwater peels off from the inner surface and falls while running down. However, if the inclination angle θ2 is made too large, the height H2 of the umbrella-shaped portion of the cover plate 20 becomes too high, which can cause problems in terms of design. Note that the inclination angle θ2 does not necessarily have to be greater than 45 degrees, and in cases where the design of the cover plate 20 is important, the inclination angle θ2 can be set to an angle less than 45 degrees.

As described above, it is desirable that the rising height H3 of the cylinder 21 provided in the center of the cover plate 20 has a rising height that allows rainwater that falls into the exhaust flow escape port 22 at an inclination angle θ1 (see FIG. 1) greater than 45 degrees with respect to a vertical line to collide with the inner surface of the cylinder 21. For this reason, it is set to the same as the diameter D1 of the exhaust flow escape port 22 of the cylinder 21. Specifically, the rising height H3 of the cylinder 21 is set to 350 mm. In this way, almost all of the rainwater that falls into the exhaust flow escape port 22 of the cylinder 21 at an inclination angle θ1 (see FIG. 1) of 45 degrees will collide with the inner surface of the cylinder 21 and then run down from the inner surface of the cylinder 21 to the inner surface of the cover plate 20. The diameter D1 of the exhaust flow escape port 22 corresponds to the diameter of the exhaust flow escape port 22 in the cylindrical tube 21 shown in FIG. 2, and corresponds to the diagonal length of the exhaust flow escape port 22 in the square tube 21 shown in FIG. 3. If emphasis is placed on preventing rainwater from entering during rainfall, the rising height H3 of the tube 21 may be made larger than the diameter D1 of the exhaust flow escape port 22 of the tube 21. If emphasis is placed on the design of the cover plate 20, the rising height H3 of the tube 21 may be made smaller than the diameter D1 of the exhaust flow escape port 22 of the tube 21.

REFERENCE SIGNS LIST 10 Chimney body 11 Discharge port 20 Cover plate 21 Cylinder body 22 Exhaust flow escape port 23 Internal flow path 24 Lower edge of cover plate 50 Frame body 100 Chimney S Space H3 Rising height of cylinder body θ1 Falling angle of rainwater

Claims (1)

A chimney having a cover plate arranged above the discharge port of a cylindrical chimney body, with a space between them, to prevent rainwater from falling into the chimney body and flowing in,
The cover plate is formed in an umbrella shape with an outward downward slope, and a cylinder having an exhaust flow escape port at the top end and opening the above-mentioned space to the outside air through an internal flow path is erected in the center of the cover plate, so that the exhaust flow coming out of the outlet of the chimney body rises without bending through the above-mentioned space and is released straight upward from the exhaust flow escape port of the cylinder in the center of the cover plate,
The space between the exhaust port of the chimney body and the cover plate is surrounded by a frame body made of louvers that has exhaust performance capable of discharging the exhaust flow to the outside, so that a path is formed in which the exhaust flow coming out of the exhaust port of the chimney body passes through the space surrounded by the frame body made of the louvers and is curved and discharged to the outside of the frame body,
The annular lower edge of the cover plate is disposed outside the edge of the outlet of the chimney body,
The chimney is characterized in that the cylindrical body has a rising height that allows rainwater poured into the exhaust flow escape port at an inclination angle of more than 45 degrees with respect to a vertical line to collide with the inner surface of the cylindrical body, and the opening area of the exhaust flow escape port is smaller than the opening area of the discharge port of the chimney body.

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