JP2010145016A - Chimney - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To increase a flow velocity of a gas rising in a cylindrical section of a chimney body with a simple constitution. <P>SOLUTION: A central section pressure reducing member 13 is mounted on a top section of the chimney body 12 to lower a pressure at a part of an exhaust port 12a of the chimney body 12. The central section pressure reducing member 13 has the disc shape having an outer diameter of a required size, and has an opening 14 communicated with the exhaust port 12a at its central section. A top face of the central section pressure reducing member 13 has the shape raised at its central part with gentle curvature in comparison with an outer peripheral section, so that wind is collected to the central section from any direction, and the wind velocity is increased toward the central section. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to a chimney that reduces the pressure at the outlet and increases the flow velocity of the airflow rising toward the outlet.

  The chimney is used for various applications as a cylindrical device that exhausts the exhaust to the atmosphere, but it is generally confirmed that increasing the height tends to increase the wind speed of the exhaust rising in the chimney. .

  It is also known in the prior art that in conventional chimneys, the speed of the updraft in the chimney can be increased by lowering the pressure at the exhaust outlet as the top outlet. The following has been proposed as a method of increasing the flow velocity of the rising airflow in the chimney based on the concept.

  That is, as shown in FIGS. 7 and 8, the rotary shaft 2 is rotatably supported by the bearing 3 on the upper surface of the conical structure 1 constructed on the foundation, and the wide side of the rotary shaft 2 is wide. The upper part of the concentric cover 5 of the annular floating chimney 4 group is integrally attached to the side surface of the conical portion so that the rotating shaft 2 and the floating chimney 4 rotate integrally. A blade 6 group is attached to the floating chimney 4 radially with respect to the rotary shaft 2, and a guide plate 8 is fixed adjacent to the outer plate 7 of the floating chimney 4. Below the floating chimney 4 group, a surface airflow utilization device 9 for changing a horizontal airflow to an ascending airflow is attached. Above the rotating shaft 2, an upper airflow utilization device 10 that rectifies the upper airflow. Is attached to the column 11. As a result, the upper air pressure is lower than the lower air pressure inside the floating chimney 4 group, so that an ascending airflow is always generated. A rotational force corresponding to the angle of each blade and the speed of the updraft is generated. This rotational force causes the air pressure to drop in inverse proportion to the speed of the upper air flow above the floating chimney, and the speed of the rising air flow in each floating chimney increases in inverse proportion to the air pressure above it. Yes (see, for example, Patent Document 1).

JP-A-6-221259

  However, the one described in Patent Document 1 is such that the rotary shaft 2 is rotatably supported on the upper surface of the chimney portion formed on the upper part of the structure, and the floating chimney group is integrally attached to the rotary shaft 2. Thus, the horizontal airflow is changed to the upward airflow by the surface airflow utilization device 9, and the structure is complicated.

  Therefore, the present invention is intended to provide a chimney having a simple structure and capable of increasing the flow velocity of the airflow rising inside by reliably reducing the pressure at the outlet.

  In order to solve the above problems, the present invention provides a central pressure reducing member having a central portion attached to the top of a cylindrical chimney main body in a horizontal state with an outer shape larger than the outer diameter of the chimney main body, It has an opening that communicates with the exhaust port of the chimney main body, and has a configuration that has a surface shape raised from a peripheral portion to the opening edge so that the wind speed can be increased as the crosswind approaches the center of the opening, The opening of the central part pressure reducing member is configured to be integrated with the exhaust port of the chimney body.

  Further, a plurality of guide fins having a required height are arranged in the radial direction on the surface of the central pressure reducing member in the above configuration so as to collect air toward the center.

  Furthermore, a central pressure reducing member with guide fins attached to the surface in the radial direction is integrally combined with the required distance above and below so that the front side faces each other, and the lower central pressure reducing member made up of the two upper and lower sheets It is good also as a structure attached to the top part of a chimney main body.

  Furthermore, in each structure, it is good also as a structure which installed the power generation turbine in the required location in the cylindrical part of a chimney main body, drives a power generation turbine with an updraft, and was made to generate electric power.

The chimney of the present invention has the following excellent effects.
(1) The central pressure reducing member, which is attached to the central portion in the horizontal state at the top of the cylindrical chimney main body, has an outer shape larger than the outer diameter of the chimney main body, and communicates with the exhaust port of the chimney main body at the center. It has an opening, and is configured to have a surface shape raised from a peripheral portion to an opening edge so that the wind speed can be increased as the cross wind approaches the center of the opening, and the opening of the central pressure reducing member is formed. Since both are united according to the exhaust port of the chimney main body, when a crosswind blows, a part of the crosswind is guided along the surface of the central pressure reducing member and approaches the center opening center. The wind speed of the cross wind increases. When the wind speed increases, the pressure decreases according to Bernoulli's theorem, so the pressure at the exhaust port of the chimney body decreases, the pressure difference between the top and bottom of the chimney body increases, and the wind speed of the gas rising inside the chimney body Can be increased.
(2) It is possible to easily increase the wind speed of the rising gas with a simple configuration of the chimney top.
(3) Even if the height of the chimney main body is lowered as described above, the rising gas can be exhausted without reducing the wind speed.
(4) By attaching guide fins to the surface of the central pressure reducing member, the effect of collecting air at the center can be enhanced, the pressure at the center can be reduced, and the wind speed of the rising gas is further increased. It becomes possible.
(5) Further, a central pressure reducing member having guide fins attached in the radial direction on the surface is integrally combined with the required distance above and below so that the front side faces each other, and the lower central portion is made into two pieces By adopting a configuration in which the pressure reducing member is attached to the top of the chimney main body, the wind collecting effect can be further enhanced.
(6) In each of the above configurations, by installing a power generation turbine at a required location in the cylindrical portion of the chimney main body, the power generation turbine can be driven by the increased updraft to generate power, and the amount of power generation can be reduced. Can be increased.

  The best mode for carrying out the present invention will be described below with reference to the drawings.

  FIG. 1 shows an outline of the basic structure of a chimney according to the present invention. The chimney main body 12 having a tower shape has a disk shape having a required outer diameter at the top, and the wind speed increases as the cross wind approaches the center. The central portion of the central pressure reducing member 13 that is shaped to gently rise from the peripheral portion on the upper surface side toward the central portion with a smooth curve is attached to form an integral structure.

  More specifically, the central pressure reducing member 13 is provided with an opening 14 having a size similar to that of the exhaust port 12a serving as the outlet portion of the chimney main body 12 in the central portion, and is a disk shape having an outer diameter of a required size. As it is. In addition, the upper surface, which is the surface, has a shape in which the central portion is raised with a gentle slope and is raised with a smooth curve from the outer peripheral portion, in other words, the central portion pressure attached to the top of the chimney main body 12. The reducing member 13 is a shape that draws a gentle curve that goes vertically downward as it goes from the center to the outer periphery, curves upward as it approaches the outer periphery, and the outermost periphery becomes horizontal. A curve similar to a Venturi tube is drawn. Thereby, when the cross wind which goes to a center part from any direction of an outer peripheral part flows along the raised part 15 of a center part, the flow velocity is made to increase in a center part.

  The central pressure reducing member 13 is positioned at the top of the chimney main body 12 so that the central opening 14 communicates with the exhaust port 12a of the chimney main body 12, and the chimney main body 12 is fixed together. The chimney has a disk-shaped central pressure reducing member 13 at the top of the.

  Since the chimney of the present invention has the above-described configuration, when the chimney main body 12 is installed and used as a required length, when a cross wind (horizontal wind) 16 blows near the top of the chimney main body 12, the principle shown in FIG. As shown in the figure, the cross wind blowing above the central pressure reducing member 13 installed at the top of the chimney main body 12 is guided while being bent along the raised portion 15 in the central portion of the upper surface of the central pressure reducing member 13. Since a part of the cross wind 16 is merged at the upper part of the opening 14 and passed therethrough, the wind speed increases as the cross wind 16 approaches the center of the exhaust port 12a of the chimney main body 12. When the wind speed increases, the pressure drops according to Bernoulli's theorem. As a result, the difference between the pressure at the exhaust port 12a at the top of the chimney body 12 and the pressure at the lower position in the chimney body 12 increases, the buoyancy of the gas in the chimney body 12 increases, and the flow velocity of the updraft ( Wind speed) / flow rate (air volume) will increase.

  Therefore, for example, as shown in FIG. 3, when the power generation turbine 17 is installed at a required portion of the cylindrical portion of the chimney main body 12, the power generation turbine 17 is driven as the upward air flow increases, and wind power generation is performed. As a result, the amount of power generation can be increased.

  The central pressure reducing member 13 that causes a pressure drop in the central part when the cross wind blows is shaped like a disk so that the central part is raised with a smooth curved surface. Since the airflow is also induced along the upper surface with respect to the crosswind 16 from the direction, the wind speed can be increased at the center.

  In addition, although the center part pressure reduction member 13 in this invention is so advantageous that a large outer diameter is large, what is necessary is just to select a magnitude | size suitably by the relationship with a weight.

  Next, FIG. 4 shows another embodiment of the present invention, which has a surface shape similar to that of the central pressure reducing member 13 in the embodiment shown in FIG. Guide fins 18 having a length extending from the edge to the outer peripheral edge are arranged radially at a required interval in the circumferential direction, and each guide fin 18 is installed upright. The central pressure reducing member 13A is configured to be collected at the center of 12a. The other components are the same as those shown in FIG. 1, and the same components are denoted by the same reference numerals.

  According to this embodiment, when a cross wind blows to the chimney main body 12, the flow of the cross wind is the same as that shown in FIG. 2 above the central pressure reducing member 13A at the top of the chimney main body 12. In the embodiment, the guide fins 18 are provided in the radial direction on the upper surface of the central pressure reducing member 13A, and the gap between the guide fins 18 adjacent in the circumferential direction is narrowed toward the opening 14 side. Therefore, the airflow induced along the central pressure reducing member 13A is caused to flow into the exhaust port 12a of the chimney main body 12 by the flow along the shape of the upper surface of the member 13A and the flow guided by the guide fins 18. As it approaches, the flow velocity of the airflow is greatly increased. As described above, this causes a pressure drop at the exhaust port 12a portion of the chimney main body 12 according to Bernoulli's theorem, and the pressure between the exhaust port 12a portion of the chimney main body 12 and the lower position of the chimney main body 12 is reduced. The difference is increased, and the wind speed / air volume rising the cylindrical portion of the chimney main body 12 can be increased.

  Further, FIG. 5 is an extension of the embodiment of FIG. 4 as another embodiment of the present invention, and has the same configuration as the central pressure reducing member 13A with the guide fin 18 shown in FIG. Are arranged so that the surface sides are opposed to each other, the spacing between the central pressure reducing members 13A is arbitrarily set, and the necessary portions in the peripheral portion are connected via the spacing holding member 19, and are relative to each other in the vertical direction. The two central pressure reducing members 13A facing each other are integrated into one central pressure reducing member 13B.

  One of the upper and lower central pressure reducing members 13B configured as described above is attached to the top of the chimney main body 12, and the lower surface of the central pressure reducing member 13B attached to the chimney main body 12 and the chimney main body. A plurality of reinforcing ribs 20 are attached in the circumferential direction between the outer wall surface 12 and the chimney body 12 is firmly supported by the chimney main body 12 with a double-structured central pressure reducing member 13B.

  According to this embodiment, the required gap is formed between the two members 13A arranged above and below, and the gap in the central part is narrower than the gap in the peripheral part. As shown in the principle diagram, when the cross wind 16 blows and blows in one direction, first, the cross wind 16 flowing between the upper and lower members 13A is guided along the surfaces of the upper and lower members 13A. Guided by the guide fins 18 and guided. Since the induced cross wind 16 is throttled as it approaches the center, the wind speed increases. When the wind speed increases, the pressure decreases according to Bernoulli's theorem as described above, and the pressure decreases at the exhaust port 12a portion of the chimney main body 12 of FIG. Thereby, the pressure difference between the upper and lower sides of the chimney main body 12 increases, the buoyancy of the gas in the chimney main body 12 also increases, and the wind speed of the rising gas can be increased. Further, in this embodiment, the member 13A configured as shown in FIG. 4 is configured to be mounted on the top of the chimney main body 12 by being combined vertically with the guide fins 18 facing inside, There is an advantage that the wind collecting effect can be enhanced as compared with the embodiment shown in FIG.

  Note that the present invention is not limited to the above embodiment, and in each of the embodiments shown in FIGS. 4 and 5, as shown in FIG. 3, a required portion in the cylindrical portion of the chimney main body 12. A power generation turbine may be installed in the cylinder, and the power generation turbine may be driven by increasing the wind speed rising in the cylindrical portion to increase the amount of power generation. Also, the guide fins 18 shown in FIGS. As long as the airflow can be collected in the central portion, it may have a shape other than that shown in the figure, and each guide fin 18 has a length that reaches the peripheral portion of the member 13A, but the outer end portion is the peripheral portion. 5 and 6, in the embodiment shown in FIGS. 5 and 6, the central opening 14 of the member 13A located on the upper side may be closed to prevent intrusion of rainwater, etc. Depart from the gist of the present invention And various modifications can be made with no range is a matter of course.

It is a perspective view which shows the outline of one Embodiment of the chimney of this invention. It is a schematic diagram which shows the principle of the airflow in the case of being based on embodiment shown in FIG. It is a figure which shows the case where a power generation turbine is installed in the cylindrical part of the chimney main body in embodiment shown in FIG. 1, FIG. 2, and a power generation turbine is driven with an updraft, and it is made to generate electric power. It is a perspective view which shows the outline of the other form of implementation of the chimney of this invention. It is a perspective view which shows the outline of other form of implementation of the chimney of this invention. It is a schematic diagram which shows the principle of the airflow in the case of being based on embodiment shown in FIG. It is the longitudinal cross-sectional view of the apparatus made to generate electric power so that the conventional ascending current in a chimney might be increased. It is a cross-sectional view of the chimney of FIG.

Explanation of symbols

12 Chimney body 12a Exhaust port 13, 13A, 13B Central part pressure reducing member 14 Opening 15 Raised part 16 Cross wind 17 Power generation turbine 18 Guide fin

Claims (4)

  The central pressure reducing member, which has a central portion attached to the top of the cylindrical chimney main body in a horizontal state, has an outer shape larger than the outer diameter of the chimney main body, and has an opening communicating with the exhaust port of the chimney main body at the center. And a surface shape that is raised with a smooth curve from the peripheral part to the edge of the opening so that the wind speed can be increased as the crosswind approaches the center of the opening, and the opening of the central pressure reducing member is formed in the chimney main body. A chimney characterized in that both are united according to the exhaust port.   The chimney according to claim 1, wherein a plurality of guide fins having a required height are arranged in a radial direction on the surface of the central pressure reducing member so as to collect air in the center.   A central pressure reducing member with guide fins attached to the surface in the radial direction is integrally combined with the required distance above and below so that the surface side faces, and the lower central pressure reducing member made up of two upper and lower parts, The chimney according to claim 2, wherein the chimney is attached to the top of the chimney main body.   The chimney according to claim 1, 2, or 3, wherein a power generation turbine is installed at a required location in the cylindrical portion of the chimney main body, and the power generation turbine is driven by an updraft to generate power.

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