JP7159028B2 - Exhaust top, method of manufacturing exhaust stack with exhaust top, and facility with exhaust stack - Google Patents

Description

An embodiment of the present invention relates to an exhaust stack that releases gas into the atmosphere, and more particularly to an exhaust top provided at the top of an exhaust stack that diffuses and releases gas containing hydrogen into the atmosphere in a nuclear facility.

Nuclear power facilities and the like are generally provided with a so-called exhaust stack, which is a facility for discharging gas generated in the facility into the atmosphere. For example, if a severe accident such as core damage occurs in the containment vessel located in the reactor building, hydrogen will be generated inside the containment vessel, and the reactor building will be filled with gas containing hydrogen. I have something to do. Such hydrogen-containing gas may contain radioactive substances. Radioactive substances contained in the gas are reduced or removed using a vent filter or the like. The exhaust stack guides the hydrogen-containing gas that has been subjected to such exhaust treatment (so-called off-gas treatment) from the facility to the vertical upper side (hereinafter simply referred to as "vertical upper side"), and releases it into the atmosphere at a sufficiently high position. It is desirable to release to

An exhaust top is sometimes provided at the upper tip (hereinafter referred to as the "top") of the exhaust pipe in the vertical direction in order to perform good exhaust and prevent rainwater from entering. If rainwater enters from the opening of the exhaust pipe, it may adversely affect equipment such as a vent filter located upstream in the direction of gas flow (that is, downward in the vertical direction). Various structures have been proposed for exhaust tops to prevent rainwater from entering.

JP 2015-68551 A Japanese Patent No. 4370588

In the exhaust top, openings (hereinafter referred to as exhaust ports) for releasing gas from the exhaust stack into the atmosphere have various structures. The exhaust top described in the above-mentioned patent document is provided in the exhaust pipe of the combustion equipment, and is for discharging the combusted gas into the atmosphere. The exhaust top described in the patent document is required to prevent rainwater from entering the exhaust pipe and to prevent clogging due to soot and the like contained in the discharged gas.

On the other hand, exhaust stacks installed in nuclear facilities and the like are required to safely diffuse and release hydrogen-containing gas into the atmosphere. This is because, for example, if the gas is emitted horizontally (so-called sideways), the blowing down of the gas containing radioactive substances is more likely to affect the surrounding environment than upward. When the gas is emitted vertically upward, the opening at the top of the exhaust stack that guides the gas vertically from the facility (hereinafter referred to as the top opening) is usually vertically upward. In this case, at the exhaust top, it is necessary to prevent rainwater from entering the exhaust pipe directly through the top opening. In addition, there is a demand for a technique for causing the gas containing hydrogen to flow vertically upward and release it into the atmosphere through an opening (hereinafter referred to as an exhaust port) located vertically above the exhaust top.

The embodiments of the present invention have been made in view of the above circumstances, and are intended to prevent rainwater from entering the exhaust stack while allowing the gas containing hydrogen from the top opening of the exhaust stack to flow vertically through the exhaust port. It is an object of the present invention to provide an exhaust top that can be vented upwards into the atmosphere, and a facility with such an exhaust top.

In order to achieve the above objects, an exhaust top of an embodiment of the present invention extends annularly vertically above and radially outward of a top opening of an exhaust stack, and exhausts gas from the top opening. a body having an exhaust port that discharges into the atmosphere vertically upward, and an exhaust passage that guides the flow of gas from the top opening radially outward and then leads it to the exhaust port located vertically upward; A gap is provided between the body and an opening edge portion of the exhaust pipe surrounding the top opening so that rainwater that has flowed into the exhaust passage through the exhaust port can be discharged to the outside of the exhaust pipe. , and has a plurality of connecting portions disposed between a top portion of the exhaust stack and the body to connect the body to the top portion, the plurality of connecting portions extending around the perimeter of the opening edge. the gap is formed between the connecting portions adjacent in the circumferential direction, and the body extends substantially horizontally vertically above the top opening; An upper body facing the exhaust passage and an upper body arranged radially outwardly from the opening edge at a predetermined interval, extending radially outwardly from the connecting portion, and facing the exhaust passage. a lower body with the connecting portion extending vertically radially outwardly of the opening edge, the vertical member connecting the upper body and the lower body; The upper body has a dish-shaped bottom portion that extends in a substantially horizontal direction, and is arranged vertically above the upper body and radially inward of the exhaust port. Further, the top plate has an outer surface that is inclined with respect to the horizontal direction so as to be located vertically downward toward the exhaust port, and rainwater received by the outer surface is drained to the exhaust port. and

In addition, in the method for manufacturing an exhaust pipe with an exhaust top according to the embodiment of the present invention, the exhaust pipe extends vertically above the top opening of the exhaust pipe and radially outwardly from the top opening and extends annularly from the top opening. a body having an exhaust port that discharges gas vertically upward into the atmosphere; and an exhaust passage that guides the flow of gas from the top opening radially outward and then leads it to the exhaust port located vertically upward. a portion of the exhaust pipe that surrounds the top opening and the body and the opening edge portion that can discharge rainwater that has flowed into the exhaust passage through the exhaust port to the outside of the exhaust pipe; An air gap is formed having a plurality of connections disposed between the top of the stack and the body to connect the body to the top, the plurality of connections being located at the opening edge. The gap is formed between the connecting portions adjacent in the circumferential direction, and the body extends substantially horizontally vertically above the top opening. is arranged radially outwardly from the opening edge at a predetermined distance from the upper body facing the exhaust passage, extends radially outward from the connecting portion, and faces the exhaust passage. and a lower body extending vertically outwardly of the opening edge, the connecting portion including a vertical member connecting the upper body and the lower body. , the upper body has a dish-like bottom extending substantially horizontally, is arranged vertically above the upper body and radially inward of the exhaust port, and covers the upper body. and the top plate has an outer surface that is inclined with respect to the horizontal direction so as to be positioned vertically downward toward the exhaust port, and rainwater received on the outer surface is discharged to the exhaust port. a top, wherein the upper body and the lower body are coupled via the vertical member, and the top plate is joined to the upper body to form an exhaust top. bonding a connection pad to a position corresponding to the vertically lower end of the vertical member on the outer surface of the top of the exhaust stack; and the vertically lower end of the vertical member. coupling the exhaust top to the top of the stack by overlapping portions with the connection pads.

According to the embodiment of the present invention, rainwater is prevented from directly entering the exhaust pipe through the top opening, and the rainwater that has flowed into the exhaust passage through the exhaust port is prevented from flowing through the opening edge surrounding the top opening and the body. The gas containing hydrogen can be discharged vertically upward into the atmosphere through the exhaust port while being discharged to the outside of the exhaust stack through the gap formed between them.

FIG. 4 is a partial cross-sectional view of the exhaust top according to the first embodiment, showing a cross-sectional elevational view and a front view of the exhaust top; FIG. 4 is a top view of the exhaust top according to the first embodiment, showing the top surface with the upper body covered with the top plate and the top surface with the top plate and the bottom of the upper body omitted. FIG. 4 is a diagram showing respective flows of hydrogen-containing gas and rainwater at the exhaust top according to the first embodiment; FIG. 10 is a partial cross-sectional view of the exhaust top according to the second embodiment, showing a cross-sectional elevational view and a front view of the exhaust top; Note that FIG. 4 shows a manner in which the exhaust top is connected to the exhaust stack with bolts. FIG. 11 is a partial cross-sectional view of the exhaust top according to the third embodiment, showing a cross-sectional elevational view and a front view of the exhaust top; Note that FIG. 5 shows a mode in which a mesh-like member (bird screen) is arranged at the exhaust port of the exhaust top. FIG. 11 is a top view of the exhaust top according to the third embodiment, showing the top surface with the upper body covered with the top plate and the top surface with the top plate and the bottom of the upper body omitted. FIG. 10 is a partial cross-sectional view of the exhaust top according to the fourth embodiment, showing a cross-sectional elevational view and a front view of the exhaust top. Note that FIG. 7 shows a structure for preventing the exhaust top from falling.

An embodiment of the present invention will be described below with reference to the drawings. It should be noted that the present invention is not limited to the embodiments described below, and various modifications are possible without departing from the gist of the present invention.

[First embodiment]
The exhaust top of this embodiment will be described with reference to FIGS. 1 to 3. FIG. FIG. 1 is a partial cross-sectional view of the exhaust top according to the present embodiment, showing a cross-sectional elevational view and a front view of the exhaust top. FIG. 2 is a top view of the exhaust top according to the present embodiment, showing the top surface with the upper body covered with the top plate and the top surface with the top plate and the bottom of the upper body omitted. FIG. 3 is a diagram showing the respective flows of hydrogen-containing gas and rainwater at the exhaust top according to the present embodiment. In FIG. 1, the upper side in the vertical direction is indicated by an arrow U, and is simply referred to as "vertically upper side" in the following description. Also, the lower side in the vertical direction is indicated by an arrow D, and is simply referred to as "vertical lower side" in the following description.

As shown in FIGS. 1 and 2, the exhaust top 10 of this embodiment is arranged vertically above the exhaust stack, and diffuses and releases the gas flowing in the exhaust stack into the atmosphere. The exhaust top 10 is also called "exhaust top", "exhaust terminal" or "vent terminal".

In this embodiment, the exhaust stack guides gas produced in a nuclear facility, for example, a reactor building having a containment vessel (not shown) therein, to a relatively high position vertically upward. In such a facility, for example, if an accident occurs that damages the reactor core in the containment vessel, gas containing hydrogen is generated, and the facility may be filled with the gas. In such a case, the exhaust stack guides the hydrogen-containing gas filling the facility to a position higher than the facility.

The stack is generally vertical, at least the top 2 forming the vertical upper side, as shown in FIG. 1, is vertical. The stack has a top opening 3 at its top 2 . A gas containing hydrogen flows out from the top opening 3 of the exhaust stack. In this embodiment, at least the top portion 2 of the exhaust pipe has a substantially cylindrical shape. Specifically, the top 2 has a substantially circular cross-section perpendicular to its axis (indicated by a dashed line A in the figure). The top opening 3 is likewise substantially circular. The axis of the top portion 2 of the exhaust stack passes through the center of the top opening 3 (indicated by point A in FIG. 2), as indicated by the dashed line A in FIG.

(Configuration of exhaust top)
The exhaust top 10 has a body 20 having an annular exhaust port 22 and an exhaust passage 24 formed therein. In this embodiment, the body 20 has an upper body 30 that forms a vertical upper side and a lower body 40 that forms a vertical lower side. Each connecting portion 50 extends in the vertical direction, and is joined to a member (hereinafter referred to as a vertical member) 52 that is joined to both the upper body 30 and the lower body 40, and the outer surface 2a of the top portion 2 of the exhaust stack. and a member (hereinafter referred to as a connection pad) 56 to be connected.

As shown in FIG. 1, the upper body 30 has a dish-like bottom portion 31 extending substantially horizontally, and is arranged vertically above the top opening 3 of the exhaust stack at a predetermined distance. On the other hand, the bottom portion 41 of the lower body 40 has a dish shape that extends in a substantially horizontal direction. Between the vertically lower inner surface 33 of the upper body 30 and the vertically upper inner surface 43 of the lower body 40, the flow of gas from the top opening 3 of the exhaust stack is guided to an exhaust port 22, which will be described later. A passage (hereinafter referred to as an exhaust passage) 24 is formed.

As shown in FIG. 2, the upper body 30 and the lower body 40 are substantially circular and arranged coaxially with the exhaust pipe, as shown in the top view of FIG. The radially outer edge 45 of the lower body 40 has a larger diameter than the radially outer edge 35 of the upper body 30 . As shown in FIG. 1, the edge 45 of the lower body 40 is positioned at substantially the same height as the edge 35 of the upper body 30 in the vertical direction. Between these edges 35 and 45, an opening (hereinafter simply referred to as "exhaust port") 22 is formed which extends annularly around the axis A of the top portion 2 of the exhaust stack and discharges gas into the atmosphere. be done.

As shown in FIG. 2, the exhaust port 22 extends in a ring-like band shape vertically above the top opening 3 of the exhaust pipe and radially outside the top opening. The exhaust port 22 opens vertically upward. This is because the exhaust top 10 is required to emit gas vertically upward. The exhaust port 22 is the vertically upper end of the exhaust passage 24 , and all of the gas that has flowed into the exhaust passage 24 through the top opening 3 of the exhaust pipe is released to the atmosphere through the exhaust port 22 .

The exhaust passage 24 receives the flow of gas through the top opening 3 of the stack, as indicated by arrow G1 in FIG. The gas flowing into the exhaust passage 24 changes its direction of flow near the bottom 31 of the upper body 30, as indicated by arrow G2 in FIG. The gas flows radially outward in the exhaust passage 24 as indicated by an arrow G3. More specifically, it flows radially outward along the inner surfaces 33 , 43 between the inner surface 43 of the lower body 40 and the inner surface 33 of the upper body 30 . That is, the exhaust passage 24 formed in the body 20 guides the flow of gas from the top opening 3 radially outward.

Then, the gas flowing through the exhaust passage 24 changes direction and flows vertically upward in the vicinity of the portion of the upper body 30 including the edge 35, as indicated by an arrow G4 in FIG. In this embodiment, the portion including the edge 35 of the upper body 30 and the portion including the edge 45 of the lower body 40 change the direction of gas flow from radially outward to vertically upward. A vertically upward gas flow is formed between these of the exhaust passages 24 and discharged into the atmosphere through the annular exhaust port 22 .

The exhaust top 10 has a portion (hereinafter referred to as a connection portion) 50 which is arranged between the body 20 (30, 40) and the top portion 2 of the exhaust pipe and connected to the top portion 2 of the exhaust pipe. In the exhaust top 10 of the present embodiment, the connecting portion 50 extends vertically outside the portion 4 (hereinafter simply referred to as "opening edge") surrounding the top opening 3 of the top portion 2 of the exhaust pipe. A member (hereinafter referred to as a vertical member) 52 that connects the upper body 30 and the lower body 40 is arranged between the top portion 2 of the exhaust pipe and the vertical member 52, and the top portion 2 and a member (hereinafter referred to as a connection pad) 56 that is bonded to the outer surface 2a of the . A plurality of connection pads 56 are arranged on the outer surface 2 a of the top portion 2 in one-to-one correspondence with the plurality of vertical members 52 .

A vertically upper end (hereinafter referred to as an upper end) 53 of the vertical member 52 is joined to the bottom portion 31 of the upper body 30 . A portion (hereinafter referred to as an intermediate portion) 54 between a vertically lower end portion (hereinafter referred to as a lower end portion) 55 and an upper end portion 53 of the vertical member 52 is an opening of the lower body 40. It is joined to edge 44 . Thus, upper body 30 and lower body 40 are connected via vertical member 52 to form body 20 .

The lower end 55 of the vertical member 52 is then aligned radially outwardly of the corresponding connection pad 56 and bonded to the connection pad 56 . Thereby, the body 20 is connected to the stack top 2 via the connection 50 , ie the vertical member 52 and the connection pad 56 . In this embodiment, a plurality of connection portions 50 are arranged at intervals in the circumferential direction of the opening edge portion 4 of the exhaust pipe. A gap 8 is formed between the connecting portions 50 adjacent in the circumferential direction. Rainwater that has flowed into the exhaust passage 24 through the exhaust port 22 is discharged radially outward of the top portion 2 of the exhaust pipe through the gap 8 .

The exhaust top 10 also has a member (hereinafter referred to as a flow resistance member) 60 that creates flow resistance to the gas flow in the exhaust passage 24 . A flow resistance member 60 is positioned across the exhaust passage 24 . The flow resistance member 60 is a member in which a plurality of openings are arranged, and causes flow resistance to the gas flow passing through the openings. In this embodiment, the flow resistance member 60 is a mesh member made of metal, and is a so-called metal screen.

As shown in FIGS. 1 and 2, the flow resistance member 60 has a substantially cylindrical shape on the radially outer side of the top portion 2 of the exhaust stack. That is, it surrounds a region 24a of the exhaust passage 24 vertically above the top opening 3 of the exhaust stack. The air gaps 8 described above are arranged adjacent to the flow resistance member 60 . In this embodiment, the vertically lower end of the flow resistance member 60 is joined to the outer surface of the top portion 2 . On the other hand, the vertically upper end of the flow resistance member 60 is joined to the inner surface 33 of the bottom 31 of the upper body 30 . All of the gas entering the central region 24a of the exhaust passage 24 from the stack top opening 3 flows radially outward through the openings 62 of the flow resistance member 60. As shown in FIG.

The exhaust top 10 also has a plate-like member (hereinafter referred to as a top plate) 70 arranged vertically above the body 20 . The top plate 70 is arranged vertically above the upper body 30 of the body 20 and radially inside the annular exhaust port 22 to cover the upper body 30 . The top plate 70 allows the rainwater received by the outer surface 73 on the vertically upper side to flow to the annular exhaust port 22 on the radially outer side. This prevents rainwater from accumulating on the dish-shaped upper body 30 .

In this embodiment, the outer surface 73 of the top plate 70 has a substantially conical shape with an apex angle slightly smaller than 180 degrees. The outer surface 73 is inclined with respect to the horizontal direction so as to be positioned downward in the vertical direction as it approaches the annular exhaust port 22 . Rainwater falling on the outer surface 73 flows radially outward on the outer surface 73 toward the annular exhaust port 22 as indicated by an arrow D1 in FIG. influx.

Rainwater that has flowed into the exhaust passage 24 flows radially inward on the inner surface 43 of the lower body 40 as indicated by arrows D2 and D3 in FIG. Then, as indicated by arrows D4 and D5, through the gap 8 between the opening edge portion 44 of the lower body 40 and the opening edge portion 4 of the top portion 2 of the exhaust pipe, the fuel is radially outward of the top portion 2 of the exhaust pipe. Ejected. In this embodiment, the flow resistance member 60 located radially outside the top portion 2 extends vertically below the top portion opening 3 . Therefore, even if rainwater adheres to the flow resistance member 60 , the rainwater flows vertically downward along the flow resistance member 60 and is discharged radially outward of the top portion 2 . As a result, it is possible to prevent rainwater from flowing into the exhaust pipe through the top opening 3 .

(Manufacturing method of exhaust stack with exhaust top)
Next, a method of manufacturing an exhaust stack provided with the exhaust top 10 of this embodiment will be described with reference to FIGS. 1 and 2. FIG.

(1A. Step of forming exhaust top)
In the manufacturing method of this embodiment, first, the exhaust top 10 is formed. The "step of forming the exhaust top" includes a step of forming the body 20 having the annular exhaust port 22 and the exhaust passage 24 described above. In this embodiment, the bottom 31 of the upper body 30 is joined to the upper end 53 of each of the plurality of vertical members 52 , and the opening edge 44 of the lower body 40 is joined to each of the plurality of vertical members 52 . The intermediate portion 54 is joined. The upper body 30 and lower body 40 and the vertical member 52 can be joined by welding or the like, for example.

As a result, an annular exhaust port 22 is formed between the vertically upper edge 35 of the upper body 30 and the vertically upper edge 45 of the lower body 40 . An exhaust passage 24 communicating with the exhaust port 22 is formed between the inner surface 43 and the inner surface 43 . It should be noted that the “step of forming the exhaust top” also preferably includes a step of joining the top plate 70 to the upper body 30 .

(1B. Step of bonding connection pads)
Further, in the manufacturing method of the present embodiment, the connection pads 56 for connecting the body 20 of the exhaust top 10 to the top portion 2 of the exhaust stack are formed before and after the "step of forming the exhaust top" described above. It joins to the outer surface 2a of the top portion 2 of the exhaust stack. In this "connection pad bonding step", the connection pad 56 is bonded to the outer surface 2a of the top portion 2 of the exhaust stack at a position corresponding to the lower end portion 55 on the vertically lower side of the vertical member 52 . In this embodiment, a plurality of connection pads 56 corresponding to the lower ends 55 of the plurality of vertical members 52 on a one-to-one basis are joined to the outer surface 2 a of the top portion 2 . It is also preferable to bond the above-described flow resistance member 60 to the outer surface 2a after bonding the connection pad 56 to the outer surface 2a of the top portion 2 .

(2. Step of joining the exhaust top to the top of the exhaust stack)
Thereafter, the vertically lower lower end 55 of the vertical member 52 overlaps the connection pad 56 to join the exhaust top 10 to the stack top 2 . In the "step of joining the exhaust top to the top of the exhaust stack", the lower end 55 of the vertical member 52 is overlapped with the corresponding connection pad 56 to couple the exhaust top 10 to the top of the stack 2. . In this embodiment, the lower end portion 55 and the connection pad 56 are joined by welding or the like, for example.

An exhaust stack provided with the exhaust top 10 is manufactured as described above. The above-described step of joining the top plate 70 to the upper body 30 may be performed after the exhaust top 10 is joined to the top portion 2 of the exhaust stack. Also, the flow resistance member 60 may be coupled to the bottom portion 31 of the upper body 30 in the "step of forming the exhaust top".

As described above, the exhaust top 10 of the present embodiment extends vertically upward from the top opening 3, which is the opening of the top portion 2 of the exhaust pipe, and radially outward from the top opening 3, and extends annularly. An annular exhaust port 22 that discharges the gas containing hydrogen from the opening 3 to the atmosphere vertically upward, and after guiding the gas flow from the top opening 3 radially outward, the above vertically upward a body 20 having an exhaust passage 24 leading to an exhaust port 22; Between the opening edge 4 that surrounds the top opening 3 of the exhaust pipe and the body 20, more specifically, between the opening edge 44 on the vertically lower side of the lower body 40, A gap 8 is formed so that the rainwater that has flowed into the exhaust passage 24 through the exhaust port 22 can be discharged outside the exhaust pipe, specifically, radially outward of the top portion 2 .

According to the exhaust top 10 of the present embodiment, while preventing rainwater from directly entering the exhaust pipe through the top opening 3, the hydrogen-containing gas from the top opening 3 of the exhaust pipe is discharged through the annular exhaust port 22. It can be discharged vertically upwards into the atmosphere through The rainwater that has flowed into the exhaust passage 24 through the exhaust port 22 passes through the gap formed between the opening edge 4 that surrounds the top opening 3 of the exhaust pipe and the opening edge 44 on the vertically lower side of the body 20. 8 can be discharged to the outside of the exhaust stack.

The exhaust top 10 also has a plurality of connecting portions 50 arranged between the top portion 2 of the exhaust stack and the body 20 to connect the body 20 to the top portion 2 . The plurality of connection portions 50 are arranged at intervals in the circumferential direction of the opening edge portion 4, and the gap 8 is formed between the two connection portions 50 adjacent to each other in the circumferential direction. did. That is, a plurality of gaps 8 are arranged in the circumferential direction outside the opening edge 4 in the radial direction. As a result, the rainwater that has flowed into the exhaust passage 24 through the exhaust port 22 can be discharged to the outside of the exhaust pipe substantially uniformly in the circumferential direction.

In addition, the exhaust top 10 is arranged in the vicinity of the air gap 8 across the exhaust passage 24, and has a plurality of openings 62 arranged therein. 60 was further provided. As a result, a region having a high gas flow velocity and a low static pressure can be formed in the vicinity of the gap 8 in the exhaust passage 24 , and leakage of gas from the gap 8 can be suppressed.

Further, in the present embodiment, the flow resistance member 60 is a net-like member made of metal. As a result, even if the hydrogen-containing gas is ignited for some reason in the exhaust stack or the exhaust top, flame propagation can be prevented in the flow resistance member 60 arranged in the exhaust passage 24.

[Second embodiment]
The exhaust top of this embodiment will be described with reference to FIG. FIG. 4 is a partial cross-sectional view of the exhaust top according to the present embodiment, showing a cross-sectional elevational view and a front view of the exhaust top. In addition, about the structure substantially common with 1st Embodiment, substantially the same code|symbol is attached|subjected and description is abbreviate|omitted.

In this embodiment, the exhaust top 10B is coupled to the exhaust stack using bolts 80. As shown in FIG. A connection pad 56B that is joined to the top portion 2 of the exhaust stack is formed with a female thread 58 that can be screwed with the male thread 82 of the bolt 80 . A through-hole 57 through which the male screw of the bolt 80 is passed is formed in the lower end portion 55B of the vertical member 52B located on the vertically lower side.

In the manufacturing method of this embodiment, the upper end 53 of the vertical member 52B having the through hole 57 formed in the lower end 55B is joined to the upper body 30, and the upper end 53 and the lower end are joined together. The intermediate portion 54 between 55B and the lower body 40 are joined to form the exhaust top 10B. On the other hand, a connection pad 56B having a female thread 58 formed in advance is joined to the outer surface 2a of the top portion 2 of the exhaust pipe.

Then, in the exhaust top 10B, the through hole 57 in the lower end 55B of the vertical member 52B is aligned with the internal thread 58 of the connection pad 56B joined to the exhaust pipe, The male thread 82 of the bolt 80 is passed through the through hole 57 and screwed with the female thread 58 . The lower ends 55B of the plurality of vertical members 52B are overlapped one-to-one with the plurality of corresponding connection pads 56B and coupled with bolts 80 to respectively connect the exhaust top 10B to the top portion 2 of the exhaust stack. can be firmly fixed to the In addition, since they are connected using bolts 80, they can be removed and connected again when necessary for maintenance.

[Third Embodiment]
The exhaust top of this embodiment will be described with reference to FIGS. 5 and 6. FIG. FIG. 5 is a partial cross-sectional view of the exhaust top according to the present embodiment, showing a cross-sectional elevational view and a front view of the exhaust top. FIG. 6 is a top view of the exhaust top according to the present embodiment, showing the top surface with the upper body covered with the top plate and the top surface with the top plate and the bottom of the upper body omitted. In addition, about the structure substantially common with 1st Embodiment, substantially the same code|symbol is attached|subjected and description is abbreviate|omitted.

The exhaust top 10</b>C of this embodiment has a screen (hereinafter referred to as bird screen) 77 that can prevent birds from entering the exhaust passage 24 . The bird screen 77 is arranged to cover the annular exhaust port 22 of the exhaust top 10C. The mesh size of the bird screen 77 is larger than the openings of the flow resistance member 60 described above. The bird screen 77 does not block the passage of rainwater or gas. The size of the mesh of the bird screen 77 is set and selected according to the size of birds, foreign objects, etc., which are desired to be prevented from entering the exhaust passage 24 . According to this embodiment, it is possible to prevent birds and relatively large foreign objects from entering the exhaust passage 24 through the annular exhaust port 22 .

[Fourth Embodiment]
The exhaust top of this embodiment will be described with reference to FIG. FIG. 7 is a partial cross-sectional view of the exhaust top according to the present embodiment, showing a cross-sectional elevational view and a front view of the exhaust top. In addition, about the structure substantially common with 1st Embodiment, substantially the same code|symbol is attached|subjected and description is abbreviate|omitted.

As a structure for preventing the exhaust top 10D of this embodiment from falling, the body 20D has an engaging portion 26 that can be engaged with a hook to which a wire or the like is connected. In this embodiment, the engaging portion 26 has a ring shape protruding from the outer surface 46 of the lower body 40 of the body 20 . A through hole 27 through which a wire or a hook is passed is formed in the engaging portion 26 .

By engaging the hook to which the wire is connected with the engaging portion 26, the exhaust top 10D is protected from damage to the connection portion 50 (for example, the vertical member 52) due to an unexpected event such as an earthquake. Even if there is, it is possible to prevent the top portion 2 of the exhaust stack from falling to the ground or the like.

[Other embodiments]

In each of the above-described embodiments, the flow resistance member 60 is a net member made of metal, but the flow resistance member according to the present invention is not limited to this aspect. A plurality of openings are arranged in the flow resistance member, and it is sufficient that the flow resistance member generates flow resistance in the flow of gas passing through the openings. For example, the flow resistance member according to the present invention may be a plate-shaped member having a large number of through holes arranged therein.

Further, in each embodiment, the bodies 20 and 20D spread out in a substantially horizontal direction vertically above the top opening 3, and the upper body 30 facing the exhaust passage 24 and the opening edge 4 of the top 2 of the exhaust pipe. The lower body 40 is disposed radially outwardly at a predetermined interval, widens radially outwardly from the connecting portion 50, and faces the exhaust passage 24. Such a body is not limited to this aspect. The body only needs to have the above-described annular exhaust port 22 and the above-described exhaust passage 24. For example, the body may be composed of a single body.

Also, in each embodiment, the connection portion includes a plurality of vertical members 52 extending vertically and joined to the body 20, and a plurality of connection pads joined to the outer surface 2a of the top portion 2 of the exhaust stack. However, the connecting portion according to the present invention is not limited to this aspect. The connecting portion may be arranged between the top portion 2 of the exhaust pipe and the body 20 to connect the body 20 to the top portion 2, and can be realized by members of various shapes.

While several embodiments of the invention have been described, these embodiments have been presented by way of example and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and modifications can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the scope of the invention described in the claims and equivalents thereof.

2: top (top of exhaust pipe), 2a: outer surface (outer surface of top of exhaust pipe), 3: top opening (opening at top of exhaust pipe), 4: opening edge (edge surrounding opening at top of exhaust pipe) part), 8: void, 10, 10B, 10C, 10D: exhaust top, 20, 20D: body, 22: exhaust port, 24: exhaust passage, 24a: region (exhaust passage), 26: engaging portion (body) 27: Through hole (engaging portion), 30: Upper body (body), 31: Bottom (bottom of upper body), 33: Inner surface (upper body), 35: Rim (upper body), 40: Lower body, 41: bottom (bottom of lower body), 43: inner surface (lower body), 44: opening edge (opening edge on the vertically lower side of lower body), 45: edge (lower body), 46: Outer surface (lower body), 50: connecting portion, 52, 52B: vertical member (connecting portion), 53: upper end (vertical member), 54: intermediate portion (vertical member), 55, 55B: lower end portion (lower end of vertical member), 56, 56B: connection pad (connection portion), 57: through hole (vertical member), 58: female thread (connection pad), 60: flow resistance member (net-like member), 62: opening (flow resistance member), 70: top plate, 73: outer surface (top plate), 77: bird screen, 80: bolt, 82: male screw (bolt)

Claims (11)

an exhaust port vertically above the top opening of the exhaust stack and extending annularly radially outward of the top opening and discharging gas from the top opening vertically upward into the atmosphere; an exhaust passage that guides the flow of gas from radially outward and then to the exhaust port located vertically above,
Between the body and an opening edge portion of the exhaust pipe surrounding the top opening, there is a gap capable of discharging rainwater that has flowed into the exhaust passage through the exhaust port to the outside of the exhaust pipe, is formed and
a plurality of connecting portions disposed between a top portion of the exhaust stack and the body and connecting the body to the top portion, the plurality of connecting portions being spaced apart in a circumferential direction of the opening edge; arranged, wherein the gaps are formed between the connecting portions adjacent in the circumferential direction,
The body extends in a substantially horizontal direction vertically above the top opening, and is arranged radially outwardly of the opening edge at a predetermined distance from the upper body facing the exhaust passage, and a lower body extending radially outwardly from a connecting portion and facing the exhaust passage, the connecting portion extending vertically radially outwardly of the opening edge; a vertical member connecting the upper body and the lower body;
The upper body has a dish-shaped bottom portion that spreads in a substantially horizontal direction, and is arranged vertically above the upper body and radially inward of the exhaust port. , furthermore,
The top plate has an outer surface inclined with respect to the horizontal direction so as to be located vertically downward toward the exhaust port, and rainwater received on the outer surface is allowed to flow to the exhaust port.
An exhaust top characterized by: The connecting part is
2. The exhaust top of claim 1 , including a connection pad positioned between the vertical member and the top of the stack and bonded to an outer surface of the top. The connection pad is formed with a female thread that engages with the male thread of the bolt,
The vertical member is formed with a through hole through which the male screw is passed,
By inserting the male screw through the through hole from the outside of the vertical member to which the upper body and the lower body are coupled and screwing the male screw into the female screw, the body can be connected via the connecting portion. 3. The exhaust top of claim 2 , wherein the exhaust top is connected to the exhaust stack by a . a flow resistance member disposed in the vicinity of the air gap across the exhaust passage, having a plurality of openings arranged thereon and generating flow resistance to gas flow through the openings;
4. An exhaust top as claimed in any preceding claim , further comprising an exhaust top. 5. The exhaust top according to claim 4, wherein the flow resistance member is a mesh member made of metal. The flow resistance member is
6. The exhaust top according to claim 4 , wherein the exhaust top has a substantially tubular shape extending coaxially with the exhaust pipe vertically above the top opening on the radially outer side of the top opening. a bird screen arranged to cover the exhaust port and capable of preventing birds or foreign objects from entering the exhaust passage;
7. An exhaust top as claimed in any preceding claim, further comprising an exhaust top. an exhaust port vertically above the top opening of the exhaust stack and extending annularly radially outward of the top opening and discharging gas from the top opening vertically upward into the atmosphere; an exhaust passage that guides the flow of gas from radially outward and then to the exhaust port located vertically above,
Between the body and an opening edge portion of the exhaust pipe surrounding the top opening, there is a gap capable of discharging rainwater that has flowed into the exhaust passage through the exhaust port to the outside of the exhaust pipe, is formed and
The body is
Having an engaging portion that can be engaged with the hook,
An exhaust top connected to the exhaust pipe via the engaging portion and the hook. 9. The exhaust top of claim 8 , wherein the engaging portion protrudes from the outer surface of the body and has a through hole. Installation, characterized in that it comprises an exhaust stack with an exhaust top according to any one of claims 1 to 9 . an exhaust port vertically above the top opening of the exhaust stack and extending annularly radially outward of the top opening and discharging gas from the top opening vertically upward into the atmosphere; an exhaust passage that guides the flow of gas from radially outward and then to the exhaust port located vertically above,
Between the body and an opening edge portion of the exhaust pipe surrounding the top opening, there is a gap capable of discharging rainwater that has flowed into the exhaust passage through the exhaust port to the outside of the exhaust pipe, is formed and
a plurality of connecting portions disposed between a top portion of the exhaust stack and the body and connecting the body to the top portion, the plurality of connecting portions being spaced apart in a circumferential direction of the opening edge; arranged, wherein the gaps are formed between the connecting portions adjacent in the circumferential direction,
The body extends in a substantially horizontal direction vertically above the top opening, and is arranged radially outwardly of the opening edge at a predetermined distance from the upper body facing the exhaust passage, and a lower body extending radially outwardly from a connecting portion and facing the exhaust passage, the connecting portion extending vertically radially outwardly of the opening edge; a vertical member connecting the upper body and the lower body;
The upper body has a dish-shaped bottom portion that spreads in a substantially horizontal direction, and is arranged vertically above the upper body and radially inward of the exhaust port. , furthermore,
The top plate has an outer surface inclined with respect to the horizontal direction so as to be located vertically downward toward the exhaust port, and rainwater received on the outer surface is allowed to flow to the exhaust port.
exhaust top,
A method for manufacturing an exhaust stack comprising
joining the upper body and the lower body through the vertical member and joining the top plate to the upper body to form an exhaust top;
bonding a connection pad to a position corresponding to the vertically lower end of the vertical member on the outer surface of the top of the exhaust stack;
joining the exhaust top to the top of the exhaust stack by overlapping the vertically lower end of the vertical member with the connection pad;
A method of manufacturing an exhaust stack with an exhaust top, comprising:

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