chimney

Abstract

We provide chimneys that improve exhaust capacity at a low cost. [Solution] A chimney 1 is provided with an exhaust amplification device 10 inside a cylindrical body 2 having an inner circumferential surface 3, wherein the exhaust amplification device 10 comprises a supply unit 20 for supplying gas, a curved surface 15 that extends in an annular shape and protrudes toward the center of the cylindrical body 2, and an ejection unit 18 that generates an annular jet by ejecting the gas supplied from the supply unit 20 along the curved surface 15, and the exhaust amplification device 10 is configured such that the jet of gas ejected from the ejection unit 18 flows along the curved surface 15.

Description

Technical Field

[0004]

[0001] This invention relates to a chimney.

Background Art

[0002] Since the exhaust capacity due to the draft effect in a chimney depends on factors such as chimney height and exhaust gas temperature, there are limitations in improving the exhaust capacity of existing chimneys.

[0003] Patent Document 1 discloses a chimney provided with exhaust guide vanes in a flue. Patent Document 2 discloses an exhaust chimney that blows air into holes provided on the side surface of the chimney tube using an electric fan.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0005] In Patent Document 1 of the above prior art, when applied to an existing chimney, significant modifications are required, resulting in high costs. Also, in Patent Documents 1 and 2, it is necessary to solve various problems such as heat resistance, increased flow path loss, and rainwater countermeasures.

[0006] <0-000033>Therefore, an object of this invention is to provide a chimney with an improved exhaust capacity at low cost.

Means for Solving the Problems

[0007] To solve the above problems, a chimney according to one aspect of this invention is a chimney provided with an exhaust capacity increasing device for increasing the exhaust capacity inside a cylindrical body having an inner peripheral surface, The exhaust amplification device is A supply unit that supplies gas, A curved surface extending in an annular shape and projecting toward the center of the cylindrical body, The system includes an ejection unit that generates an annular jet by ejecting the gas supplied from the supply unit along the curved surface, The exhaust amplification device is characterized in that it is configured such that the jet of gas ejected from the ejection section flows along the curved surface. [Effects of the Invention]

[0008] According to this invention, the Coanda effect causes the gas jet to flow along the curved surface, resulting in a low-pressure inner region located inside and surrounded by the annular curved surface. This makes it easier for exhaust gas upstream of the cylinder to flow into the inner region. As a result, the suction force of the chimney is increased, and the exhaust capacity can be increased beyond the normal draft effect with a simple structure. [Brief explanation of the drawing]

[0009] [Figure 1] This is a diagram illustrating a chimney according to the first embodiment. [Figure 2] This is a schematic cross-sectional view of the exhaust amplification device installed inside the chimney shown in Figure 1. [Figure 3] This is a schematic cross-sectional view of an exhaust gas amplification device according to Modification 1. [Figure 4] This is a schematic cross-sectional view of an exhaust gas amplification device according to modified example 2. [Figure 5] This is a schematic cross-sectional view of an exhaust gas amplification device according to modified example 3. [Figure 6] This diagram schematically illustrates a chimney according to the second embodiment. [Figure 7] This is a schematic cross-sectional view along the line VII-VII in Figure 6. [Figure 8] This is a schematic cross-sectional view along the line VIII-VIII in Figure 7. [Modes for carrying out the invention]

[0010] Hereinafter, embodiments of the chimney 1 according to this invention will be described with reference to the drawings. In the disclosure of this invention, since the exhaust gas flows from below to above as an upward airflow, in the chimney 1, the lower part is referred to as the upstream side and the upper part is referred to as the downstream side. Also, the flow of the gas ejected from the exhaust gas increasing device 10 is illustrated by arrows. This gas is, for example, a viscous gas, specifically air.

[0011] 〔First Embodiment〕<00079>The chimney 1 according to the first embodiment will be described with reference to FIGS. 1 and 2. FIG. 1 is a diagram schematically explaining the chimney 1 according to the first embodiment. FIG. 2 is a schematic cross-sectional view of the exhaust gas increasing device disposed inside the chimney of FIG. 1.

[0012] As shown in FIG. 1, the chimney 1 includes an exhaust gas increasing device 10 inside a cylindrical body 2 extending in the height direction. The cylindrical body 2 has a lower cylindrical part 2a located on the upstream side, an upper cylindrical part 2b located on the downstream side, and a central cylindrical part 2c located at the center in the height direction. The inner peripheral surface 3 of the cylindrical body 2 has, for example, a closed annular shape such as a circle or an ellipse in a plan view. Inside the cylindrical body 2, a flue 4 is formed through which exhaust gas discharged from, for example, a heating furnace (not shown) flows from below to above as an upward airflow. The exhaust gas increasing device 10 is disposed, for example, in the vicinity of the central cylindrical part 2c of the cylindrical body 2.

[0013] The exhaust gas increasing device 10 shown in FIG. 1 is disposed in contact with the inner peripheral surface 3 of the cylindrical body 2. Thereby, the vortex generated in the vicinity of the inner peripheral surface 3 of the cylindrical body 2 can be suppressed, so that the exhaust capacity of the chimney 1 can be increased.

[0014] The exhaust gas increasing device 10 has a raised part 11 having a curved surface 15, a wind guiding part 12, a storage part 16, a supply part 20, and a blower 30. The supply part 20 supplies the gas sent out by the blower 30 to the storage part 16 and has, for example, a pipe shape. The gas is supplied to the storage part 16 through the supply port 22.

[0015] Among the exhaust gas increasing device 10, the members disposed on the inner peripheral surface 3 of the cylindrical body 2 such as the raised portion 11 and the air guiding portion 12 are made of, for example, a heat-resistant metal. In order to reduce the frictional resistance when the gas flows along the surface of the curved surface 15 of the raised portion 11, the curved surface 15 of the raised portion 11 is processed into a smooth surface.

[0016] As shown in FIG. 2, the raised portion 11 has a curved surface 15 that extends annularly and protrudes while curving toward the center of the cylindrical body 2 on the inner side. The curved surface 15 has an upstream skirt portion 15a, a top portion 15b, and a downstream skirt portion 15c.

[0017] The upstream skirt portion 15a, the top portion 15b, and the downstream skirt portion 15c form a smoothly curved mountain shape. As a result, when the high-speed gas jet flows over the curved surface 15, the Coanda effect occurs, and the surrounding pressure decreases, making it easier for the exhaust gas on the upstream side of the cylindrical body 2 to flow into the inner region 5.

[0018] The upstream skirt portion 15a is located on the upstream side with respect to the top portion 15b and extends obliquely upward away from the inner peripheral surface 3 from the lower part 2a of the cylinder. The downstream skirt portion 15c is located on the downstream side with respect to the top portion 15b and extends obliquely upward closer to the inner peripheral surface 3 toward the upper part 2b of the cylinder. The upstream inclination angle of the upstream skirt portion 15a on the side of the lower part 2a of the cylinder is configured to be larger than the upstream inclination angle of the upstream skirt portion 15a on the side of the top portion 15b, and the downstream inclination angle of the downstream skirt portion 15c is, for example, 20 degrees.

[0019] For example, the space between the curved surface 15 and the inner circumferential surface 3 is a solid structure (it does not have to be solid; a structure such as a truss or ribs that can maintain the upstream base 15a as a structural element is also possible. However, it must be a structure separated from the storage section 16. Also, if there are no strength issues, the structure can include the storage section 16). The storage section 16 is configured to be located on the side of the upstream base 15a closest to the lower part 2a of the cylinder. The storage section 16 has a cavity structure defined, for example, by the portion of the upstream base 15a closest to the lower part 2a of the cylinder and the air guide section 12. The supply port 22 of the supply section 20 is connected to the storage section 16, and gas is supplied to the storage section 16. The storage section 16 extends in an annular shape and has the function of temporarily storing the gas supplied from the supply section 20. This allows for the stable ejection of an annular gas jet.

[0020] The air guide section 12 is positioned opposite the portion of the upstream base 15a closest to the lower part 2a of the cylinder and extends diagonally upward away from the inner circumferential surface 3. A small, annular gap 17 is formed between the upstream base 15a and the air guide section 12. The gas temporarily stored in the storage section 16 flows through the small, annular gap 17 and is then ejected as an annular gas jet through the annular ejection section 18. The annular gas jet ejected from the ejection section 18 flows along the upstream base 15a. This makes the gas jet more likely to bend at the top 15b, allowing the inner region 5, which is located inside the annular curved surface 15 and surrounded by the annular curved surface 15, to be at a lower pressure.

[0021] The annular gas jet ejected from the nozzle 18 flows along the curved surface 15 in the order of upstream base 15a, top 15b, and downstream base 15c. As a result, the Coanda effect causes the gas jet to flow along the curved surface 15, creating a low-pressure area in the inner region 5 surrounded by the annular curved surface 15. This makes it easier for exhaust gas on the side of the lower part of the cylinder 2a (i.e., the upstream side of the cylinder 2) to flow into the inner region 5, thereby increasing the exhaust capacity of the chimney 1. Therefore, a chimney 1 with improved exhaust capacity at low cost can be provided.

[0022] [Modified examples of exhaust amplification devices] The exhaust amplification device 10 according to the modified version will be described with reference to Figures 3 to 5. Figure 3 is a schematic cross-sectional view of the exhaust amplification device 10 according to Modification 1. Figure 4 is a schematic cross-sectional view of the exhaust amplification device 10 according to Modification 2. Figure 5 is a schematic cross-sectional view of the exhaust amplification device 10 according to Modification 3.

[0023] As shown in Figure 3, in the exhaust amplification device 10 according to Modification 1, for example, the space between the downstream base 15c and the inner circumferential surface 3 is a solid structure, and the space between the upstream base 15a and the inner circumferential surface 3 is a hollow structure having a storage section 16. The storage section 16 has a hollow structure defined by a vertical surface extending perpendicularly to the inner circumferential surface 3 from the top 15b toward the inner circumferential surface 3, the upstream base 15a, and the inner circumferential surface 3, as shown in Figure 3, for example. The supply port 22 of the supply unit 20 is connected to the storage section 16, and gas is supplied to the storage section 16. The supply port 22 faces the upstream base 15a which extends diagonally with respect to the inner circumferential surface 3. The storage section 16 extends in an annular shape and has the function of temporarily storing the gas supplied from the supply unit 20. This makes it possible to stably eject an annular jet of gas.

[0024] The air guide section 12 is positioned opposite the upstream base section 15a and extends diagonally upward relative to the inner circumferential surface 3. A small, annular gap 17 is formed between the upstream base section 15a and the air guide section 12. The upstream inclination angle of the upstream base section 15a relative to the inner circumferential surface 3 is configured to be slightly greater than the downstream inclination angle of the downstream base section 15c relative to the inner circumferential surface 3. For example, the upstream inclination angle is between 10 and 30 degrees, and the downstream inclination angle is between 0 and 30 degrees.

[0025] The gas temporarily stored in the storage section 16 flows through a tiny annular gap 17 and is then ejected as an annular gas jet through the annular ejection section 18. The annular gas jet ejected from the ejection section 18 flows along the upstream base 15a. This makes the gas jet more likely to bend at the top 15b, allowing the inner region 5 surrounded by the annular curved surface 15 to be at a lower pressure.

[0026] As shown in Figure 4, in the exhaust amplification device 10 according to the modified example 2, the air guide section 12 is arranged opposite the top section 15b. A minute annular gap 17 is formed between the top section 15b and the air guide section 12. As shown in Figure 4, the storage section 16 is defined by the upstream base section 15a, the inner circumferential surface 3, and the air guide section 12. In the storage section 16, the supply port 22 of the supply section 20 faces the air guide section 12, which extends diagonally upward away from the inner circumferential surface 3. The upstream inclination angle of the upstream base section 15a with respect to the inner circumferential surface 3 is configured to be greater than the downstream inclination angle of the downstream base section 15c with respect to the inner circumferential surface 3.

[0027] The gas temporarily stored in the storage section 16 flows through a tiny annular gap 17 and is then ejected as an annular gas jet through the annular ejection section 18. The annular gas jet ejected from the ejection section 18 flows along the curved surface 15, first the downstream portion of the top 15b and then the downstream base 15c. As a result, the Coanda effect causes the gas jet to flow along the curved surface 15, creating a low-pressure environment in the inner region 5 surrounded by the annular curved surface 15. This makes it easier for exhaust gas on the side of the lower part of the cylinder 2a (i.e., the upstream side of the cylinder 2) to flow into the inner region 5, thereby increasing the exhaust capacity of the chimney 1.

[0028] As shown in Figure 5, in the exhaust amplification device 10 according to the modified example 3, the air guide section 12 is positioned opposite the upstream base section 15a on the side closer to the top section 15b. The gas jet is then ejected from a point on the upstream base section 15a that is close to the top section 15b. This makes it easier for the gas jet to bend at the top section 15b, increasing the storage volume of the storage section 16 and allowing for the stable ejection of an annular gas jet.

[0029] A small, annular gap 17 is formed between the upstream base 15a and the air guide 12. As shown in Figure 5, the storage section 16 is defined by the portion of the upstream base 15a closest to the lower part 2a of the cylinder, the inner circumferential surface 3, and the air guide 12. In the storage section 16, the supply port 22 of the supply section 20 faces the air guide 12, which extends diagonally upward away from the inner circumferential surface 3. The upstream inclination angle of the upstream base 15a on the lower part 2a side of the cylinder is configured to be greater than the upstream inclination angle of the upstream base 15a on the top 15b side. Furthermore, the downstream inclination angle of the downstream base 15c is configured to be smaller than the air guide inclination angle of the air guide 12; for example, the downstream inclination angle is 20 degrees and the air guide inclination angle is 30 degrees.

[0030] The gas temporarily stored in the storage section 16 flows through a tiny annular gap 17 and is then ejected as an annular gas jet through the annular ejection section 18. The annular gas jet ejected from the ejection section 18 flows along the curved surface 15 in the following order: the part of the upstream base 15a near the top 15b, the top 15b, and the downstream base 15c. As a result, the Coanda effect causes the gas jet to flow along the curved surface 15, creating a low-pressure environment in the inner region 5 surrounded by the annular curved surface 15. This makes it easier for exhaust gas on the side of the lower part of the cylinder 2a (i.e., the upstream side of the cylinder 2) to flow into the inner region 5, thereby increasing the exhaust capacity of the chimney 1.

[0031] Furthermore, the storage volume of the storage section 16 is configured to increase in the order of Modification 1, Modification 2, and Modification 3. This increases the temporary storage volume of gas in the storage section 16, allowing for stable ejection of an annular gas jet.

[0032] [Second Embodiment] The chimney 1 according to the second embodiment will be described with reference to Figures 6, 7, and 8. Figure 6 is a schematic diagram illustrating the chimney according to the second embodiment. Figure 7 is a schematic cross-sectional view along the line VII-VII in Figure 6. Figure 8 is a schematic cross-sectional view along the line VIII-VIII in Figure 7.

[0033] As shown in Figure 6, the exhaust amplification device 10 is arranged at a distance from the inner circumferential surface 3 of the cylindrical body 2. The differences from the exhaust amplification device 10 according to the first embodiment described above will now be explained.

[0034] The exhaust amplification device 10 further includes a lateral support section 26 and a central support section 27. The lateral support section 26 is a member for supporting the raised section 11 and the air guide section 12 on the cylindrical body 2, spaced apart from the inner circumferential surface 3 of the cylindrical body 2. The lateral support section 26 extends laterally (radially) toward the center of the cylindrical body 2. For example, four lateral support sections 26 are arranged spaced apart in the circumferential direction. For example, at least one lateral support section 26 also serves as a supply section 20, which has the function of supplying the gas sent out by the blower 30 to the storage section 16.

[0035] The exhaust amplification device 10 shown in Figures 6, 7, and 8 is positioned at a distance from the inner circumferential surface 3 of the cylindrical body 2. Even with this structure, the inner region 5 surrounded by the annular curved surface 15 has a lower pressure than the outer region between the inner circumferential surface 3 of the cylindrical body 2 and the outer circumferential surface of the exhaust amplification device 10, so the exhaust gas is drawn into the inner region 5. As a result, the exhaust capacity of the chimney 1 can be increased.

[0036] Although specific embodiments and numerical values ​​of this invention have been described, this invention is not limited to the above embodiments and can be implemented with various modifications within the scope of this invention.

[0037] The exhaust amplification device 10 can be installed at various height positions on the cylindrical body 2, such as the lower part 2a, the upper part 2b, and the central part 2c. Installing the exhaust amplification device 10 on the side of the lower part 2a of the cylindrical body 2 (i.e., the upstream side of the cylindrical body 2) simplifies the installation work of the exhaust amplification device 10, thus reducing costs. Installing the exhaust amplification device 10 on the side of the upper part 2b of the cylindrical body 2 (i.e., the downstream side of the cylindrical body 2) can further increase the exhaust capacity of the chimney 1. Installing the exhaust amplification device 10 near the central part 2c of the cylindrical body 2 allows for a balance between cost and exhaust capacity. Furthermore, multiple exhaust amplification devices 10 may be installed on the side of the lower part 2a, the side of the upper part 2b, etc., of the cylindrical body 2.

[0038] In the above embodiment, air is exemplified as the viscous gas, but exhaust gas, air, and a mixture of exhaust gas may also be used.

[0039] This invention and its embodiments can be summarized as follows:

[0040] One embodiment of this invention is a chimney 1, A chimney 1 having an exhaust amplification device 10 inside a cylindrical body 2 having an inner circumferential surface 3, which increases the exhaust capacity of the cylindrical body 2, The exhaust amplification device 10 is A supply unit 20 that supplies gas, A curved surface 15 extends in an annular shape and protrudes toward the center of the cylindrical body 2, The system includes an ejection unit 18 that generates an annular jet by ejecting the gas supplied from the supply unit 20 along the curved surface 15, The exhaust amplification device 10 is characterized in that the gas jet ejected from the ejection section 18 flows along the curved surface 15.

[0041] According to the above configuration, the Coanda effect causes the gas jet to flow along the curved surface 15, resulting in a low pressure in the inner region 5 surrounded by the annular curved surface 15. This makes it easier for exhaust gas on the side of the lower part 2a of the cylindrical body 2 (i.e., the upstream side of the cylindrical body 2) to flow into the inner region, thereby increasing the exhaust capacity of the chimney 1.

[0042] Furthermore, in the chimney 1 of one embodiment, The exhaust amplification device 10 is arranged in contact with the inner circumferential surface 3 of the cylindrical body 2.

[0043] According to the above embodiment, since the vortex flow generated near the inner circumferential surface 3 of the cylindrical body 2 can be suppressed, the exhaust capacity of the chimney 1 can be increased.

[0044] Furthermore, in one embodiment of the chimney 1, A storage section 16 is provided between the supply section 20 and the ejection section 18, which extends in an annular shape and temporarily stores the gas.

[0045] According to the above embodiment, a jet of an annular gas can be stably ejected.

[0046] Furthermore, in one embodiment of the chimney 1, The curved surface 15 has a top portion 15b, an upstream base portion 15a located upstream of the top portion 15b and extending diagonally upward with respect to the inner circumferential surface 3, and a downstream base portion 15c located downstream of the top portion 15b and extending diagonally downward with respect to the inner circumferential surface 3. The upstream base 15a, the top 15b, and the downstream base 15c form a smoothly curved mountain shape.

[0047] According to the above embodiment, the frictional resistance of the gas jet flowing over the curved surface 15 can be suppressed.

[0048] Furthermore, in one embodiment of the chimney 1, The jet ejected from the ejection section 18 is configured to flow along the upstream base section 15a.

[0049] According to the above embodiment, the gas jet becomes more easily bent at the top 15b, and the inner region 5 surrounded by the annular curved surface 15 can be made to a lower pressure.

[0050] Furthermore, in one embodiment of the chimney 1, The jet of the gas is ejected from the upstream base 15a near the top 15b.

[0051] According to the above embodiment, the gas jet becomes more easily bent at the top 15b, and the storage volume of the storage section 16 increases, allowing for stable ejection of an annular gas jet.

[0052] Furthermore, in one embodiment of the chimney 1, The exhaust amplification device 10 is arranged at a distance from the inner circumferential surface 3 of the cylindrical body 2.

[0053] According to the above embodiment, the exhaust gas in the outer region between the inner circumferential surface 3 of the cylindrical body 2 and the outer circumferential surface of the exhaust amplification device 10 is drawn into the inner region 5 because the pressure in the inner region 5 becomes low, thereby increasing the exhaust capacity of the chimney 1. [Explanation of symbols]

[0054] 1… Chimney 2...Cylinder 2a…Bottom part of cylinder 2b...Cylinder top 2c...Center of cylinder 3…Inner peripheral surface 4…Flute 5…Inner area 10... Exhaust amplification device 11...Protuberance 12...Air guide 15…Curved surface 15a…Upstream base 15b...Top 15c…Lower part 16…Storage section 17…Gap 18…Gushing part 20…Supply section 22... Supply port 26... Lateral support part 27…Middle support part 30... Blower

Claims

1. A chimney having an inner circumferential surface and equipped with an exhaust amplification device inside the cylindrical body for increasing exhaust capacity, The exhaust amplification device is A supply unit for supplying gas, and an air guide unit, A curved surface extending in an annular shape and projecting toward the center of the cylindrical body, The system includes an ejection unit that generates an annular jet by ejecting the gas supplied from the supply unit along the curved surface, The exhaust amplification device is configured such that the jet of gas ejected from the ejection section flows along the curved surface. The curved surface has a top, an upstream base located upstream of the top and extending diagonally upward with respect to the inner circumferential surface, and a downstream base located downstream of the top and extending diagonally downward with respect to the inner circumferential surface. A chimney characterized in that the air guide portion extends diagonally upward away from the inner circumferential surface, an annular gap is formed between the upstream base and the air guide portion, and the tip of the air guide portion reaches the top.

2. The chimney according to claim 1, characterized in that the exhaust amplification device is disposed in contact with the inner circumferential surface of the cylindrical body.

3. The chimney according to claim 1, characterized in that a storage section is provided between the supply section and the discharge section, the storage section extending in an annular shape and temporarily storing the gas.

4. The chimney according to claim 1, characterized in that a smoothly curved mountain shape is formed by the upstream base, the top, and the downstream base.

5. The chimney according to claim 4, characterized in that the jet ejected from the ejection section is configured to flow along the upstream base.

6. The chimney according to claim 4, characterized in that the jet of gas is ejected from the upstream base near the top.

7. The chimney according to claim 1, characterized in that the exhaust amplification device is disposed at a distance from the inner circumferential surface of the cylindrical body.

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