JP2000238695A - Hold exhaust system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily discharge the harmful gas, a combustible gas and the like generated in a hold to the atmosphere to protect crews from the harmful gas and the like. SOLUTION: An exhaust system 1 is demoutably mounted on a manhole 3 on an upper part of a hold needing the exhaust of gas. An explosion-proof fan 9 is installed in a case body 8 of the exhaust system 1 for sucking the gas in the hold by this fan 9. An exhaust cylinder 13 formed by a rising cylinder 13a, a starboard side exhaust cylinder part 13b and a port side exhaust cylinder part 13c is installed on the case body 8. A switching plate 15 is mounted in this exhaust cylinder 13 for switching this switching plate 15 corresponding to the wind direction. Whereby the gas is discharged to the atmosphere from the starboard side exhaust cylinder part 13b when the starboard side exhaust cylinder part 13 is on the lee, and the gas is discharged to the atmosphere from the port side exhaust cylinder part 13c when the port side exhaust cylinder part 13c is on the lee. The outside air is sucked into the case body 8 through an outside air intake port 10 to lower the concentration of the gas to be discharged to the atmosphere.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hold exhaust system used when a ferrosilicon, an aluminum ferrosilicon, a silicomanganese or the like which may generate a harmful gas or a flammable gas is spread and transported on a ship. In particular, the present invention relates to a hold exhaust system that can be easily applied to existing ships.

[0002]

2. Description of the Related Art In general, when ferrosilicon, which may generate harmful gas or flammable gas, is scattered in a hold and transported by ship, the IMO (International Maritime Organization) protects the crew of the hold. For the purpose, it is required to use an explosion-proof fan to ventilate at a flow rate of 6 times the hold volume per hour.

[0003]

By the way, in general, fixed-type air supply / exhaust fans are installed in each hold of a bulking ship, but these fans are not explosion-proof, so that they are not used for transporting ferrosilicon. Requires a specification change to an explosion-proof fan.

However, in this method, the equipment cost is increased and the ferro silicon is not always transported, so that there is almost no merit in terms of money, and it is not practical.

[0005] Even if the conventional fixed-type air supply / exhaust fan is changed to an explosion-proof type, the exhaust direction cannot be controlled. May be exposed to volatile gases.

The present invention has been made in view of such a situation, and it is possible to install an explosion-proof fan only when transporting ferrosilicon and the like, and it is also possible to easily replace the fan with other ships that need it. It is an object of the present invention to provide a hold exhaust system capable of protecting crew members from harmful gases and the like.

Another object of the present invention is to provide a hold exhaust system which can easily change the direction of gas release into the atmosphere by human power and does not need to change the direction of gas release to the atmosphere unless the wind direction changes significantly. To provide.

It is another object of the present invention to provide a hold exhaust system capable of automatically changing the direction of gas release into the atmosphere in accordance with the wind direction.

Another object of the present invention is to provide a hold exhaust system that can accurately direct the direction of gas release into the atmosphere in a direction that can protect the crew, for example, downwind.

[0010] Another object of the present invention is to provide a hold exhaust system that can automatically direct the direction of gas release to the atmosphere so that crew members can be protected.

[0011] Another object of the present invention is to provide a ship hold exhaust system in which the crew can easily and accurately change the direction of gas release into the atmosphere even when the exhaust stack is heavy. To provide.

Still another object of the present invention is to provide a hold exhaust system capable of suppressing the concentration of gas discharged to the atmosphere as low as possible and more reliably protecting crew members.

[0013]

In order to achieve the above object, the present invention provides a case body detachably installed in a manhole opening at the upper part of a hold; and a case body disposed inside the case body;
An explosion-proof fan that sucks gas generated in the hold; and an exhaust mechanism that is disposed at the top of the case body and that releases the gas sucked by the fan to the atmosphere. , According to the wind direction. And since the case body is detachable from the manhole opening, it is possible to install an explosion-proof fan only when transporting ferrosilicon etc.It can be easily replaced with other ships Becomes Further, the direction of gas release can be changed according to the wind direction, so that the crew can be protected from harmful gases and the like.

According to the present invention, the exhaust mechanism includes a rising cylinder portion rising from the case main body, a starboard-side exhaust cylinder portion extending from the upper end of the rising cylinder portion to the starboard direction of the vessel, and a port port of the vessel from the upper end of the rising cylinder portion. An exhaust cylinder having a substantially T shape as a whole from a port-side exhaust cylinder extending in the direction; and disposed at a connection position of the three cylinders in the exhaust cylinder. And a switching plate for switching the connection between each exhaust cylinder portion and the rising cylinder portion. Thus, the direction in which the gas is released into the atmosphere can be easily changed manually. Further, since there are two switching directions, it is not necessary to perform the switching operation of the switching plate as long as the wind direction does not significantly change, and the burden on the crew can be reduced.

Further, the present invention is characterized in that an anemoscope for measuring a wind direction and a drive mechanism for driving a switching plate based on a signal from the anemoscope are additionally provided in the exhaust mechanism. This makes it possible to automatically switch the switching plate in accordance with the wind direction.

According to the present invention, an exhaust mechanism is connected to an exhaust pipe rising from the case main body; and the exhaust pipe is rotatably connected to the case main body about a vertical axis. A rotating mechanism capable of changing the direction of air release in the circumferential direction;
It is characterized by comprising. As a result, the direction in which the gas is released to the atmosphere can be accurately directed to a direction in which the crew can be protected, for example, downwind.

The present invention also provides an exhaust mechanism with a wind vane for measuring the wind direction and a drive mechanism for rotating the exhaust pipe around a vertical axis based on a signal from the wind vane to change the direction in which the gas is released into the atmosphere in the circumferential direction. And is additionally provided.
This makes it possible to automatically change the direction in which the gas is released into the atmosphere in accordance with the wind direction.

The present invention also provides an exhaust mechanism with an anemometer for measuring a wind direction; a driving mechanism for rotating an exhaust pipe around a vertical axis to change the direction of gas emission to the atmosphere; A control mechanism that gives a predetermined drive signal to the drive mechanism by operating the operation unit based on the operation unit, and changes a gas emission direction to a direction corresponding to a set value of the operation unit;
Is additionally provided. And since the exhaust stack can be rotated using mechanical force, even if the exhaust stack is heavy, the direction of gas release into the atmosphere is
The crew can easily and accurately change in a short time.

The present invention is further characterized in that the case body is provided with an outside air intake for taking in outside air on the inlet side of the fan. As a result, the concentration of gas released to the atmosphere can be reduced by the outside air from the outside air intake, and the crew can be more reliably protected even when the wind direction suddenly changes. Becomes

[0020]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings. FIG. 1 shows a hold exhaust system according to a first embodiment of the present invention. The exhaust system 1 is detachably attached to an upper end of a manhole 3 projecting from a deck 2 at an upper part of a hold (not shown). It is designed to be mounted and fixed.

That is, as shown in FIG. 1, the exhaust device 1 includes a donut plate-shaped base plate 4 mounted on the manhole 3, and a plurality of cuts are formed on a peripheral portion of the base plate 4. A notch 5 is provided, and a rocking bolt 6 installed on the deck 2 is fitted and locked in each of the notches 5. By tightening the wing nut 7 in this state, the base plate 4 can be fixed on the manhole 3.

As shown in FIG. 1, a container-like case body 8 having openings at upper and lower ends is provided on the base plate 4.
An explosion-proof fan 9 for sucking the gas generated in the ship's hold is arranged in the case body 8.

As shown in FIG. 1, an outside air intake pipe 10 having a valve 11 is provided on the peripheral surface of the case body 8 at the entrance side of the fan 9. By opening and closing the valve 11, outside air is taken in and stopped in the case body 8, and the amount of outside air taken into the case body 8 is controlled by adjusting the opening of the valve 11. It has become. The outside air taken into the case main body 8 from the outside air intake pipe 10 dilutes the gas sucked from the inside of the hold to reduce the gas concentration.

As shown in FIG. 1, an exhaust mechanism 12 is provided on the case body 8, and the gas in the hold absorbed by the fan 9 is released to the atmosphere via the exhaust mechanism 12. It has become so.

The exhaust mechanism 12 is, as shown in FIG.
A rising cylinder portion 13a rising from the case body 8, a starboard-side exhaust cylinder portion 13b extending in the starboard direction of the vessel from the upper end of the rising cylinder portion 13a, and a port-side exhaust cylinder extending in the port direction of the vessel from the upper end of the rising cylinder portion 13a. And an exhaust pipe 13 having a substantially T-shape as a whole from the section 13c. The connecting position of the three cylindrical sections 13a, 13b, 13c in the exhaust pipe 13 is determined by a fulcrum shaft 14 at the upper end as a fulcrum. A swingable switching plate 15 is disposed at the center of the vehicle. By switching the switching plate 15 to the side indicated by the solid line in FIG. 1,
The rising cylinder portion 13a and the port side exhaust cylinder portion 13c are connected, and the gas in the hold is released to the atmosphere from the port side exhaust cylinder portion 13c, while the switching plate 15 is switched to the side shown by the chain line in FIG. Tube portion 13a and starboard side exhaust tube portion 13
b and the gas in the hold is discharged to the starboard side
From the atmosphere.

At the intermediate position in the longitudinal direction of the switching plate 15,
As shown in FIG. 1, an operation rod 16 for manually operating the switching plate 15 by the crew is provided in a protruding manner.
2 protrudes outside through an arc hole 17 provided in the exhaust pipe 13 as shown in FIG. The operating rod 16 moves in the arc hole 17 in accordance with the switching operation of the switching plate 15.

As shown in FIG. 2, a position holding spring 18 is stretched between the operating rod 16 and a position above the fulcrum shaft 14, and the switching plate 15 is By the biasing force of the spring 18, the switch 18 is stably held at each of the switching positions indicated by the solid line and the chain line in FIG.

The switching board 15 is manually switched by the crew member as described above, and the switching is performed in the following manner in accordance with the wind direction.

That is, as shown in FIG. 3, with respect to the bow and stern direction of the ship 19, A represents a range of 5 degrees to port 5 degrees to port, B represents a range of 175 degrees to 175 degrees port, and 5 degrees to 17 degrees to starboard.
Assuming that the range of 5 degrees is C and the range D is 5 degrees to 175 degrees on the port side, when the wind direction is within the range C, the switching plate 15 is switched to release the gas from the port side exhaust cylinder portion 13c to the atmosphere, and When the wind direction is within the range D, the switching plate 15 is switched to discharge the gas from the starboard exhaust tube portion 13b to the atmosphere. When the wind direction is within the range A and the range B, the current state is maintained without switching the switching plate 15.

Next, the operation of the present embodiment will be described. When exhausting gas from the hold, first, the exhaust device 1 is installed on the manhole 3 of a ship that requires gas exhaust. Then, the explosion-proof fan 9 is started in this state. Then
The gas in the hold is sucked by the fan 9, and the sucked gas is released to the atmosphere from the starboard-side exhaust tube portion 13 b or the port-side exhaust tube portion 13 c which is the leeward side.

Since the gas is released to the atmosphere from one of the exhaust pipe portions 13b and 13c on the leeward side in accordance with the wind direction, there is no possibility that the exhaust gas will flow into the inboard living space, and the Safety can be ensured.

The switching of the switching plate 15 is manually performed. However, as shown in FIG. 3, if the range C or the range D and the ranges A and B are within a range of 190 degrees, the wind direction changes. Even if it is not necessary to switch the switching plate 15,
The burden on the crew can be reduced.

Since the gas in the hold is released to the atmosphere from the exhaust stack 13 as it is, when the gas concentration in the hold is high, the high-concentration gas is released to the atmosphere as it is. Even in this case, as described above, since the air is released from the exhaust pipe portions 13b and 13c on the leeward side, there is usually no possibility that the crew will be exposed to the gas. However, when the wind direction suddenly changes, It does not mean that the crew is not exposed to gas.

Therefore, in the present embodiment, even if the crew may be exposed to the gas, the gas released to the atmosphere is diluted by using the outside air intake pipe 10 and the safety of the crew can be sufficiently improved. Is ensured.

That is, when the valve 11 is opened while the fan 9 is running, the outside air flows into the case body 8 through the outside air intake pipe 10, and the gas sucked from the inside of the hold holds the flow of the outside air. Diluted by For this reason, the concentration of the gas released from the exhaust stack 13 to the atmosphere can always be maintained at a sufficiently low value.

When the gas concentration in the hold is low enough to cause no problem, it is preferable to reduce or fully close the valve 11 in order to improve the ventilation efficiency in the hold.

Since the outside air is taken into the case body 8 by using the outside air intake pipe 10, the concentration of the gas released from the exhaust stack 13 into the atmosphere depends on the gas concentration in the hold. And always maintain a low value,
The safety of the crew can be more completely ensured.

FIG. 4 shows a second embodiment of the present invention, in which the switching of the switching plate 15 in the first embodiment is automatically performed according to the wind direction.

That is, as shown in FIG. 4, a wind direction meter 20 for measuring the wind direction and a wind direction output meter 21 for outputting a signal corresponding to the instruction of the wind direction meter 20 are provided at the top of the exhaust stack 13.
An air cylinder 22 is installed on the side surface of the starboard-side exhaust tube portion 13b, and a connecting metal fitting 24 at the tip of the rod 23 is connected to the operating rod 1 through an elongated hole 24a in the vertical direction.
6 is connected. A controller 25 for controlling the air cylinder 22 based on a signal from the wind direction output meter 21 is provided on a side surface of the rising cylinder portion 13a. Thus, the switching of the switching plate 15 is controlled under the same conditions as those in the first embodiment.

Specifically, the wind direction output meter 21 is a wind direction indicator 2
When the indication of 0 is in the range A or B in FIG. 3, a signal of 0 volt is used, in the case of the range C in FIG. 3, a signal of +12 volt is used, and in the case of the range D in FIG. Is -12
It outputs a volt signal.
When the signal of +12 volts is input, the air cylinder 22 is reduced and controlled, and when the signal of -12 volts is input, the air cylinder 22 is extended and the signal of 0 volt is controlled. When the air cylinder 22 is input, the air cylinder 22 is controlled so as to maintain the current state in the contracted state or the extended state. In other respects, the configuration is the same as that of the first embodiment, and the operation is the same.

However, since the switching of the switching plate 15 is automatically performed in accordance with the wind direction, there is no burden on the crew and there is no possibility that other operations will be hindered.

FIG. 5 shows a third embodiment of the present invention, wherein an exhaust pipe 33 is used in place of the exhaust pipe 13 in the first embodiment.

That is, as shown in FIG. 5, the exhaust pipe 33 is mounted on the case body 8 via a bearing mechanism 34 and is rotatable about a vertical axis.
It is bent in an inverted J shape and opens at one location in the circumferential direction, and a plurality of operation handles 35 project from the lower circumferential surface of the exhaust pipe 33 at intervals in the circumferential direction. Then, each of the operating handles 35 is gripped and the crew moves the exhaust stack 33.
By rotating, the gas can always be released to the leeward side to the atmosphere. In other respects, the configuration is the same as that of the first embodiment, and the operation is the same.

Thus, by rotating the exhaust stack 33 about a vertical axis, the direction in which the gas is released to the atmosphere can be accurately directed to the direction in which the crew can be protected, specifically, normally to the leeward side. it can.

FIG. 6 shows a fourth embodiment of the present invention, in which the exhaust pipe 33 in the third embodiment is automatically rotated in accordance with the wind direction.

That is, as shown in FIG. 6, an anemometer 40 for measuring the wind direction and an anemometer output device 41 for outputting a signal in accordance with the instruction of the anemometer 40 are provided at the top of the exhaust pipe 33, as shown in FIG.
A drive mechanism 42 for rotating and driving the exhaust pipe 33 and the drive mechanism 42 are provided on the outer surfaces of the exhaust pipe 33, the bearing mechanism 34, and the case body 8 in accordance with a signal from the wind direction output meter 41. A control mechanism 43 for performing control based on each of them is provided.

The driving mechanism 42, as shown in FIG.
A large gear 44 attached to a base end outer peripheral portion of the exhaust pipe 33;
An explosion-proof motor 45 is fixed to the outer surfaces of the case body 8 and the bearing mechanism 34, and a drive gear 46 meshing with the large gear 44 is attached to an output shaft 45 a of the motor 45. The motor 45 is controlled by a control mechanism 43 that outputs a control signal according to a signal from the wind direction output meter 41, and controls the rotation of the exhaust stack 33 so that gas can be constantly released in the leeward direction to the atmosphere. It has become. In other respects, the configuration is the same as that of the third embodiment, and the operation is the same.

However, since the rotation of the exhaust stack 33 can be automatically performed in accordance with the wind direction, there is no burden on the crew and there is no trouble that other work is hindered.

FIG. 7 shows a fifth embodiment of the present invention, in which a control mechanism 53 is used in place of the control mechanism 43 in the fourth embodiment.

That is, as shown in FIG. 7, the control mechanism 53 controls the indicator 45 for indicating the wind direction measured by the anemometer 40 and the motor 45 for driving the motor 45 in accordance with the turning operation amount of the dial 55a. And an indicator 55.
By rotating the dial 55a in accordance with the display of FIG.
Is driven, and the exhaust pipe 33 is driven to rotate so that the direction in which the gas is released to the atmosphere is always leeward. In other respects, the configuration is the same as that of the fourth embodiment, and the operation is the same.

Thus, in the present embodiment, unlike the case of the fourth embodiment, it is necessary for the crew to manually operate the dial 55a. In contrast, the rotation of the exhaust stack 33 itself can be performed using mechanical force. Therefore, even if the exhaust stack 33 is heavy, the crew can easily and accurately change the direction in which the gas is released into the atmosphere. Can be changed.

FIG. 8 shows a sixth embodiment of the present invention. In place of the swing bolt 6 and the wing nut 7 in the first embodiment, a wing bolt 66 and a pad 67 are provided.
Is used.

That is, as shown in FIG. 8, a peripheral wall portion 4a bent downward at right angles is integrally provided on the peripheral edge portion of the base plate 4, and the peripheral wall portion 4a is provided with a butterfly bolt in the horizontal direction. A pad 67 is screwed onto the tip of the wing bolt 66, and a pad 67 that is in close contact with the outer surface of the manhole 3 is rotatably attached. The exhaust device 1 can be stably fixed on the manhole 3 by operating the butterfly bolt 66 to bring the pad 67 into close contact with the outer surface of the manhole 3. In other respects, the configuration is the same as that of the first embodiment, and the operation is the same.

Thus, the wing bolt 66 and the pad 67
Are installed on the exhaust system 1 side, and there is no need to process the deck 2 or the manhole 3 at all. Therefore, the present invention can be applied immediately to an existing ship, and the size of the manhole 3 differs depending on the ship. Even in this case, it can be dealt with only by adjusting the screw advance of the wing bolt 66.

[0055]

As described above, the present invention relates to a case body detachably installed in a manhole opening in the upper part of a hold; an explosion proof disposed in the case body and sucking gas generated in the hold. Mold fan; and an exhaust mechanism disposed at the top of the case body to release the gas sucked by the fan to the atmosphere, so that the gas discharge direction of the exhaust mechanism can be changed according to the wind direction. Therefore, the case main body can be attached to and detached from the manhole opening, so that an explosion-proof fan can be installed only when transporting ferrosilicon or the like, and can be easily replaced with another ship. In addition, the direction of gas release can be changed according to the wind direction, so that the crew can be protected from harmful gases and the like.

According to the present invention, the exhaust mechanism includes a rising cylinder portion rising from the case body, a starboard-side exhaust cylinder portion extending from the upper end of the rising cylinder portion to the starboard direction of the ship, and a port port of the ship from the upper end of the rising cylinder portion. An exhaust cylinder having a substantially T shape as a whole from a port-side exhaust cylinder extending in the direction; and disposed at a connection position of the three cylinders in the exhaust cylinder. And a switching plate for switching the connection between each exhaust cylinder portion and the rising cylinder portion, so that the direction in which the gas is released into the atmosphere can be easily changed manually. Further, since there are two switching directions, it is not necessary to perform the switching operation of the switching plate as long as the wind direction does not largely change, and the burden on the crew can be reduced.

According to the present invention, the exhaust mechanism is additionally provided with an anemoscope for measuring the wind direction and a drive mechanism for driving the switching plate based on a signal from the anemometer. This can be done automatically according to the wind direction.

According to the present invention, an exhaust mechanism is connected to an exhaust cylinder rising from the case main body; and the exhaust cylinder is connected to the case main body so as to be rotatable around a vertical axis. A rotating mechanism capable of changing the direction of air release in the circumferential direction;
Therefore, the direction of gas release into the atmosphere can be accurately directed to a direction in which the crew can be protected, for example, downwind.

According to the present invention, there is further provided a wind vane for measuring a wind direction and a driving mechanism for rotating an exhaust pipe around a vertical axis based on a signal from the wind vane to change the direction in which gas is released to the atmosphere in a circumferential direction. The direction of gas release into the atmosphere can be automatically changed in accordance with the wind direction.

The present invention also provides an exhaust mechanism with an anemoscope for measuring a wind direction; a driving mechanism for rotating an exhaust pipe around a vertical axis to change the direction of gas release into the atmosphere; A control mechanism that gives a predetermined drive signal to the drive mechanism by operating the operation unit based on the operation unit, and changes a gas emission direction to a direction corresponding to a set value of the operation unit;
The exhaust stack can be rotated using mechanical force, and even if the exhaust stack is heavy, the crew can easily and shortly change the direction of gas release into the atmosphere. It can be changed in time and accurately.

Further, in the present invention, since the case body is provided with an outside air intake for taking in outside air on the inlet side of the fan, the concentration of gas discharged to the atmosphere can be reduced by the outside air from the outside air intake. Therefore, even if the wind direction suddenly changes, the crew can be more reliably protected.

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional view illustrating a hold exhaust system according to a first embodiment of the present invention.

FIG. 2 is a configuration diagram of a mechanism portion of a switching plate viewed from an outer surface side of an exhaust pipe.

FIG. 3 is an explanatory diagram showing a relationship between a wind direction and a switching operation of a switching plate.

FIG. 4 is a diagram corresponding to FIG. 2, showing a second embodiment of the present invention.

FIG. 5 is a diagram corresponding to FIG. 1 showing a third embodiment of the present invention.

FIG. 6 is a diagram corresponding to FIG. 2, showing a fourth embodiment of the present invention.

FIG. 7 is a configuration diagram of a control mechanism according to a fifth embodiment of the present invention.

FIG. 8 is a configuration diagram of a base plate portion according to a sixth embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Exhaust apparatus 2 Deck 3 Manhole 4 Base plate 4a Peripheral wall part 5 Notch 6 Swing bolt 7 Wing nut 8 Case body 9 Fan 10 Outside air intake pipe 11 Valve 12 Exhaust mechanism 13, 33 Exhaust cylinder 13a Rise section 13b Starboard side exhaust cylinder part 13c Port side exhaust cylinder portion 14 Support shaft 15 Switching plate 16 Operating rod 17 Arc hole 18 Position holding spring 20, 40 Wind direction indicator 21, 41 Wind direction output meter 22 Air cylinder 23 Rod 24 Connection fitting 24a Slot 25, 55 Controller 34 bearing mechanism 42 drive mechanism 43,53 control mechanism 44 large gear 45 motor 46 drive gear 54 indicator 55a dial 66 wing bolt 67 pad

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[Procedure amendment]

[Submission date] November 22, 1999 (1999.11.
22)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Claims

[Correction method] Change

[Correction contents]

[Claims]

Claims (7)

[Claims] 1. A case body detachably installed in a manhole opening at an upper part of a hold; an explosion-proof fan disposed in the case body and sucking gas generated in the hold; and an upper part of the case body And a discharge mechanism for discharging the gas sucked by the fan to the atmosphere, wherein the discharge mechanism is capable of changing a gas discharge direction in accordance with a wind direction. . 2. The exhaust mechanism includes a rising cylinder portion rising from the case main body, a starboard-side exhaust cylinder portion extending from the upper end of the rising cylinder portion to the starboard direction of the vessel, and extending from the upper end of the rising cylinder portion to the port direction of the vessel. An exhaust pipe having a substantially T-shape as a whole from the port side exhaust pipe section; disposed at a connection position of the three pipe sections in the exhaust pipe; 2. The hold exhaust system according to claim 1, further comprising: a switching plate for switching a connection between the cylinder portion and the rising cylinder portion. 3. The hold exhaust system according to claim 2, wherein the exhaust mechanism includes a wind vane for measuring a wind direction, and a drive mechanism for driving a switching plate based on a signal from the wind vane. 4. An exhaust mechanism, comprising: an exhaust cylinder rising from the case body; connecting the exhaust cylinder to the case body so as to be rotatable about a vertical axis, and rotating the exhaust pipe about the vertical axis to release gas into the atmosphere. 2. The hold exhaust system according to claim 1, further comprising: a rotation mechanism capable of changing a rotation direction in a circumferential direction. 5. An exhaust mechanism comprising: a wind vane for measuring a wind direction; and a drive mechanism for rotating an exhaust pipe around a vertical axis based on a signal from the wind vane to change a gas discharge direction to a circumferential direction. The hold exhaust system according to claim 4, characterized in that: 6. An exhaust mechanism for measuring a wind direction; a driving mechanism for rotating an exhaust pipe around a vertical axis to change a direction in which gas is released to the atmosphere; and an operating unit based on a value indicated by the anemometer. And a control mechanism for giving a predetermined drive signal to the drive mechanism to change the direction in which the gas is released into the atmosphere to a direction corresponding to the set value on the operation section. The hold exhaust system according to claim 4. 7. The ship hold exhaust system according to claim 1, wherein the case main body is provided with an outside air intake for taking in outside air on an inlet side of the fan.