JP3491287B2 - Inlet and exhaust system for ship propulsion - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an intake / exhaust device for a marine propulsion machine, in which a propulsion unit mounted on a ship is provided with an engine, and more specifically, from an intake passage of the engine to an engine,
The present invention relates to an intake / exhaust device for a marine vessel propulsion device which has an intake / exhaust passage extending to the underwater exhaust port that opens into the water via the exhaust passage, and has a catalyst in the exhaust passage.

[0002]

2. Description of the Related Art A propulsion unit mounted on a ship is equipped with an engine, and it is desirable to take measures for exhaust gas in this propulsion unit to prevent air pollution. Therefore,
For example, JP-A-55-14977 and JP-B-59-1
As disclosed in Japanese Unexamined Patent Publication No. 8092 and Japanese Utility Model Publication No. 59-41199, a catalyst is arranged in an exhaust passage that communicates a cylinder of an engine with an underwater exhaust port, and the catalyst is used to reduce CO (carbon monoxide) in exhaust gas. ) And HC (hydrocarbons).

[0003]

By the way, in a ship carrying a heavy load, when the engine of the propulsion machine stops,
Immediately, seawater may enter the casing of the propulsion device and may come into contact with the catalyst arranged in the exhaust passage.

Further, when the propulsion unit rapidly decelerates, the water level around the propulsion unit rises due to the follow-up wave, the engine speed decreases, and the exhaust pressure decreases, so that the water pressure of the outside water causes the seawater in the casing. May enter and seawater may come into contact with the catalyst located in the exhaust passage.

As described above, when seawater adheres to the catalyst at a temperature higher than a predetermined temperature, it deteriorates due to dissolved ions in the seawater and the exhaust gas purification function deteriorates.

The present invention has been made in view of the above circumstances, and an object thereof is to provide an intake / exhaust device for a ship propulsion device which prevents seawater from flowing back into the exhaust passage and coming into contact with the catalyst. .

[0007]

In order to solve the above-mentioned problems, an intake / exhaust device for a marine vessel propulsion device according to claim 1 is provided with an engine on a propulsion device mounted on a marine vessel, and an engine is provided from an intake passage of the engine. In an intake / exhaust device for a marine propulsion device, which has an intake / exhaust passage extending to the underwater exhaust port that opens into the water through the exhaust passage, and a catalyst is arranged in the exhaust passage, engine stop detection for detecting stop of the engine Means, an exhaust passage water backflow prevention means having an opening / closing valve arranged in the middle of the intake / exhaust passage, and an exhaust passage water backflow so as to keep the opening / closing valve closed for at least a predetermined time after sensing engine stop. And a control means for controlling the prevention means to operate.

The intake / exhaust device for a ship propulsion device according to a second aspect of the present invention is characterized in that the on-off valve is disposed between the catalyst in the exhaust passage and the underwater exhaust port.

An intake / exhaust device for a marine propulsion device according to a third aspect of the present invention is characterized in that the on-off valve is arranged between the catalyst in the exhaust passage and the exhaust port of the engine.

According to a fourth aspect of the present invention, there is provided an intake / exhaust device for a marine propulsion device, wherein the opening / closing valve is arranged in an intake passage of the engine.

According to a fifth aspect of the present invention, there is provided an intake / exhaust device for a marine vessel propulsion device, wherein the propulsion device mounted on the vessel is provided with an engine, and the underwater exhaust port is opened underwater from an intake passage of the engine through the engine and the exhaust passage. A suction / exhaust device for a marine propulsion device having an intake / exhaust passage up to, and a catalyst disposed in the exhaust passage, a deceleration operation means for decelerating the propulsion machine or a deceleration sensing means for sensing deceleration of the propulsion machine, A means for preventing backflow of water in the exhaust passage having an opening / closing valve in the middle of the intake / exhaust passage, and holding the opening / closing valve closed for at least a predetermined time after sensing the operation of the deceleration operation means or deceleration exceeding a predetermined degree. And a control means for controlling so as to activate the water backflow prevention means in the exhaust passage.

According to a sixth aspect of the present invention, there is provided an intake / exhaust device for a marine vessel propulsion device, which is provided with an engine on a propulsion unit mounted on a marine vessel, and has an underwater exhaust port that opens into water from an intake passage of the engine through the engine and the exhaust passage. In an intake / exhaust device for a marine propulsion device having an intake / exhaust passage up to and a catalyst disposed in the exhaust passage, an exhaust passage internal water level sensing means disposed below the catalyst position for sensing the water level in the exhaust passage. The exhaust gas so that the on-off valve is kept closed for at least a predetermined time based on the water backflow prevention means in the exhaust passage having an on-off valve in the middle of the intake and exhaust passages and the water detection information of the water level detection means in the exhaust passage. And a control means for controlling the in-passage water backflow prevention means to operate.

An intake / exhaust device for a ship propulsion device according to a seventh aspect of the present invention has a catalyst temperature sensing means for sensing the temperature of the catalyst, and the control means closes the open / close valve when the catalyst temperature falls below a predetermined temperature. The feature is that it is returned to the open state.

According to an eighth aspect of the present invention, there is provided an intake / exhaust device for a marine propulsion device, wherein the propulsion device mounted on the marine vessel is provided with an engine, and the underwater exhaust port is opened from the intake passage of the engine into the water through the engine and the exhaust passage. In an intake / exhaust device for a marine propulsion device having an intake / exhaust passage up to and a catalyst arranged in the exhaust passage, a deceleration sensing means for detecting deceleration of the propulsion device and an opening / closing valve arranged in the middle of the intake / exhaust passage. When the exhaust pressure in the exhaust passage becomes large, which doubles as a means for preventing backflow of water in the exhaust passage.
An on-off valve that opens is placed in the middle of the exhaust passage
At the exhaust upstream side formed so as to project into the exhaust passage.
Between the upper passage located on the lower side and the lower passage located on the exhaust downstream side
And a valve disposed between the valve and the lower passage.
Such as a spring that constantly urges the valve toward the upper passage
When the exhaust pressure in the exhaust passage is high, the valve is
Exhaust pressure resists the spring to the lower passage side
Move to open the exhaust passage,
A spring keeps the valve in close contact with the upper passage and
The feature is that it is configured to close the passage .

According to a ninth aspect of the present invention, in the intake / exhaust device for a marine propulsion device, the opening / closing valve is opened / closed by a moving body that moves in the drive shaft direction in association with the rotation of the drive shaft of the engine. It has a feature.

According to a tenth aspect of the present invention, there is provided an intake / exhaust device for a marine propulsion device, which comprises a propulsion device mounted on a marine vessel and an engine. The underwater exhaust port is opened from the intake passage of the engine into the water through the engine and the exhaust passage. In an intake / exhaust device for a ship propulsion device having an intake / exhaust passage up to, and a catalyst arranged in the exhaust passage, an on-off valve arranged in the middle of the intake / exhaust passage and the on-off valve of the intake passage or the crank chamber. It is characterized by opening when the negative pressure becomes large due to the negative pressure.

According to another aspect of the present invention, there is provided an intake / exhaust device for a marine propulsion device, wherein the propulsion device mounted on the marine vessel is provided with an engine, and the underwater exhaust port is opened underwater from an intake passage of the engine through the engine and the exhaust passage. In an intake / exhaust device for a ship propulsion device, which has an intake / exhaust passage up to and a catalyst is arranged in the exhaust passage, an on-off valve arranged in the middle of the intake / exhaust passage and the water level of external water that communicates with external water And the opening / closing valve is opened / closed based on the float, and the opening / closing valve is closed when the water level rises.

[0018]

According to the first aspect of the invention, after the engine stop is sensed, the exhaust passage inflow water backflow preventing means is operated so as to keep the on-off valve closed for at least a predetermined time, and seawater flows back into the exhaust passage. Prevents seawater from touching the catalyst.

According to the second aspect of the present invention, the on-off valve is arranged between the catalyst in the exhaust passage and the underwater exhaust port, and the on-off valve is kept closed so that the seawater flows back into the exhaust passage and the seawater flows to the catalyst. Prevent touching.

According to the third aspect of the present invention, the on-off valve is arranged between the catalyst in the exhaust passage and the exhaust port of the engine, and the on-off valve is kept closed so that seawater flows back into the exhaust passage to the catalyst. Prevent contact with seawater.

According to the fourth aspect of the invention, the on-off valve is arranged in the intake passage of the engine, and the on-off valve is kept closed to prevent the seawater from flowing back into the exhaust passage and coming into contact with the catalyst. .

According to the fifth aspect of the present invention, after detecting the actuation of the deceleration operation means or the deceleration exceeding a predetermined degree, the exhaust passage water backflow prevention means is operated so as to keep the on-off valve closed for at least a predetermined time. , Prevents seawater from flowing back into the exhaust passage and coming into contact with the catalyst.

According to the sixth aspect of the invention, based on the water detection information of the water level detection means in the exhaust passage, the water reverse flow prevention means in the exhaust passage is operated so as to keep the on-off valve closed for at least a predetermined time, and It prevents seawater from flowing back to the catalyst and touching the catalyst.

According to the seventh aspect of the present invention, there is provided catalyst temperature sensing means for sensing the temperature of the catalyst, and when the catalyst temperature becomes lower than a predetermined value, the on-off valve is returned from the closed state to the open state, and seawater flows back into the exhaust passage. To prevent seawater from touching the catalyst.

According to the eighth aspect of the present invention, an on- off valve that opens when the exhaust pressure in the exhaust passage becomes large is disposed in the middle of the exhaust passage, and this on-off valve also serves as deceleration sensing means and exhaust water backflow prevention means. .

According to the ninth aspect of the invention, the on-off valve is opened and closed by the moving body that moves in the drive shaft direction in conjunction with the rotation of the drive shaft of the engine, and the seawater flows back into the exhaust passage to cause the seawater to the catalyst. Prevent touching.

According to the tenth aspect of the present invention, the on-off valve is opened when the negative pressure becomes large due to the negative pressure in the intake passage or the crank chamber, and the seawater is prevented from flowing back into the exhaust passage and coming into contact with the catalyst.

According to the eleventh aspect of the present invention, the float is connected to the outside water to detect the water level of the outside water, and the open / close valve is opened / closed based on this float, and the open / close valve is closed when the water level is above,
It prevents seawater from flowing back into the exhaust passage and coming into contact with the catalyst.

[0029]

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

First, an embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a schematic view of an intake / exhaust device for a ship propulsion device.

In the figure, reference numeral 1 is a propulsion unit mounted on a ship, and the propulsion unit 1 is provided at the rear portion of a hull 2. The propulsion device 1 has a housing 3 and a casing 4, an engine 5 is arranged above the casing 4, and a propeller 6 is arranged below the casing 4. A two-cycle engine, a four-cycle engine, or the like is used as the engine 5, and the output of the engine 5 is connected to the drive shaft 7 communicating with the inside of the casing 4, and the front and rear of the drive shaft 7 arranged inside the casing 4. It is transmitted to the propeller 6 via the progression switching gear train 8 and the propeller shaft 9.

An intake port 10 is provided behind the engine 5.
An intake passage 12 that communicates with the intake port 11 is provided, and an exhaust passage 15 that connects the exhaust port 13 and the underwater exhaust port 14 is provided in front of the engine 5. An auxiliary exhaust passage 16 is provided so as to communicate with the exhaust passage 15, and an auxiliary exhaust port 17 of the auxiliary exhaust passage 16 communicates with the atmosphere. Unlike the embodiment, the intake passage 12 and the exhaust passage 15 may be arranged in front of, in the side of, or behind the engine.

As described above, the propulsion unit 1 has the intake / exhaust passage 18 from the intake passage 12 of the engine 5 to the underwater exhaust port 14 which opens into the water through the engine 5 and the exhaust passage 15. A catalyst 20 is arranged upstream of the sub-exhaust passage 16 in the exhaust passage 15 that constitutes the intake / exhaust passage 18. The catalyst 20 removes CO (carbon monoxide), HC (hydrocarbons), NOx, etc. in the exhaust gas. Reduce.

In this propulsion device 1, the water level L1 at high speed, the water level L2 at low speed, and the water level L3 at rapid deceleration are shown, and the catalyst 20 is arranged at a position higher than the water level L2 at low speed. Is higher than the catalyst 20. This catalyst 2
When 0 is above a predetermined temperature, if seawater adheres, salt in the seawater deteriorates and the exhaust gas purification function deteriorates.

That is, during sudden deceleration, the surrounding water level rises to the sudden deceleration water level L3, and at the same time, the positive pressure in the exhaust passage decreases as the engine speed decreases. For this reason, seawater tends to flow backward from the exhaust passage 15, but the intake / exhaust device of this ship propulsion device prevents water from reaching the catalyst.

The intake / exhaust device for this ship propulsion device is constructed as follows. That is, the opening / closing valve 30 is arranged in the exhaust passage 15 downstream of the auxiliary exhaust passage 16, and the opening / closing valve 30 is driven by the opening / closing valve operating means 31. Drive power is supplied to the on-off valve operating means 31 from a battery 32 mounted on the hull 2, and the on-off valve operating means 31 is controlled by the control means 33. The on-off valve operating means 31 and the on-off valve 30 constitute exhaust passage in-water backflow prevention means 34, and the control means 33 controls the exhaust passage in-water backflow prevention means 34 so that seawater flows back into the exhaust passage 15. Therefore, the catalyst 20 is prevented from touching seawater.

Next, the control of the intake / exhaust device of the marine vessel propulsion device will be described with reference to FIG. FIG. 2 is a control block diagram of the intake / exhaust device of the ship propulsion device.

The exhaust device of this marine propulsion system includes the propulsion system 1
The deceleration operation means 40 for decelerating the vehicle, the deceleration sensing means 41 for sensing the deceleration of the propulsion machine 1, or the engine stop sensing means 42 for sensing the stop of the engine 5, and the water level in the exhaust passage 15 arranged below the catalyst position. Exhaust passage water level sensing means 43 for sensing, catalyst temperature sensing means 44 for sensing the temperature of the catalyst 20, and open / close valve 30 in the middle of the intake / exhaust passage 18.
Exhaust passage inflow water backflow preventing means 34, deceleration operating means 40, deceleration sensing means 41, engine stop sensing means 4
2, exhaust passage water level sensing means 43, catalyst temperature sensing means 4
4 for controlling the water discharge means 34 in the exhaust passage on the basis of the information from 4.

As the deceleration operation means 40, for example, an engine stop switch 50 and a throttle valve opening operation switch 51 are used.
Etc. are installed. When the engine stop switch 50 is actuated in a state where the engine speed is high, the control means 33 senses a deceleration of a predetermined speed or more, or causes the throttle valve opening operation switch 51 to move in the direction of closing the throttle valve at a speed of a predetermined speed or more. When it is operated, it senses that the deceleration exceeds a predetermined level.

As the deceleration detecting means 41, for example, an engine speed sensor 52, an intake manifold internal pressure sensor 53, an exhaust passage internal pressure detecting sensor 54, a water level sensor 55, a ship speed sensor 56, a throttle opening sensor 5 are provided.
7, an intake flow rate detection sensor 58, a fuel flow rate detection sensor 59, etc. are mounted. In the control means 33, the engine speed, the intake manifold internal pressure, the exhaust passage internal pressure,
When the ship speed, the throttle opening, the intake air flow rate, and the fuel flow rate decrease change width is more than a predetermined value, and two conditions in which this change occurs within a predetermined time are satisfied, it is sensed that the deceleration is more than the predetermined value.

As the engine stop sensing means 42, there is, for example, an engine stop sensor 60, which includes an engine speed sensor 52 and an intake manifold internal pressure sensor 5.
3, exhaust passage pressure sensor 54, water level sensor 5
5, the boat speed sensor 56, the intake flow rate detection sensor 58, and the fuel flow rate detection sensor 59. Further, for example, a water level sensor 61 is provided as the exhaust passage water level sensing means 43, and a catalyst temperature sensor 62 is provided as the catalyst temperature sensing means 44.

The engine speed sensor 52, intake manifold internal pressure sensor 53, exhaust passage internal pressure sensor 54, water level sensor 55, ship speed sensor 56,
Throttle opening sensor 57, intake air flow sensor 5
8. The catalyst temperature sensor 62 is arranged at the position shown in FIG.

Further, the means for preventing backflow of water in the exhaust passage is
For example, the drive circuit 63, the opening / closing valve drive actuator 64,
The on-off valve 30 and the like are configured to close the on-off valve 30 at an appropriate time to prevent water from entering the exhaust passage 15 and prevent seawater from touching the catalyst 20 in the exhaust passage 15. Therefore, when the temperature of the catalyst 20 is equal to or higher than a predetermined temperature, seawater is prevented from adhering to the catalyst 20, and it is prevented that the catalyst 20 deteriorates due to dissolved ions in the seawater to deteriorate the exhaust gas purification function.

As the control means 33, for example, the CPU 6
5, deceleration operation means 40, deceleration sensing means 41,
Engine stop sensing means 42, exhaust passage water level sensing means 4
3. Based on the information from the catalyst temperature sensing means 44, the exhaust passage water backflow prevention means 34 is controlled to prevent water from entering the exhaust passage and prevent seawater from touching the catalyst 20 in the exhaust passage. . This control has the following modes.

First, based on the information from the engine stop detection means 42, after detecting the engine stop, the exhaust passage in-water backflow prevention means 34 is operated to keep the open / close valve 30 closed for at least a predetermined time, and the open / close valve is opened. By closing 30 to prevent water from entering the exhaust passage 15, seawater is prevented from touching the catalyst 20 in the exhaust passage 15.

Further, based on the information from the deceleration operation means 40 or the deceleration detection means 41, after the operation of the deceleration operation means 40 or the deceleration exceeding a predetermined degree is detected, the on-off valve 30 is kept closed for at least a predetermined time. Then, the means for preventing backflow of water in the exhaust passage is operated to close the on-off valve 30 to prevent water from entering the exhaust passage 15.
It prevents the seawater from touching the catalyst 20 in 5.

Further, based on the water detection information from the water level sensing means 43 in the exhaust passage, the water reverse flow preventing means 34 in the exhaust passage is operated so as to keep the opening / closing valve 30 closed for at least a predetermined time, and the opening / closing valve 30 is closed. As a result, water is prevented from entering the exhaust passage 15 to prevent seawater from touching the catalyst 20 in the exhaust passage 15.

Further, based on the information from the catalyst temperature sensing means 44, the control means 33 controls the opening / closing valve 30 to return from the closed state to the open state when the catalyst temperature becomes lower than a predetermined value.

Next, the operation of the embodiment of the exhaust system for the ship propulsion device will be described. FIG. 3 is an operation flowchart of the exhaust device of the ship propulsion device.

When the main switch of the boat propulsion device is turned on in step a, engine control starts in step b. Then, in step c, the engine speed Ne, intake manifold pressure Pi, exhaust pipe internal pressure Pe, and seawater rise H are detected, and step d
Then, it is determined whether any one of the engine speed Ne, the intake manifold pressure Pi, and the exhaust pipe internal pressure Pe is "0", or whether the seawater rise H is "specified water level".

When the engine speed Ne, the intake manifold pressure Pi, and the exhaust pipe pressure Pe are not all "0" , or when the seawater rise H is less than or equal to the "specified water level", the process proceeds to step e. Detects the closing operation of the on-off valve. If the on-off valve is closing, the closing operation of the on-off valve is stopped in step f, the ON state of the main switch is judged in step g, and the on-off valve is not closing in step e. Also, the process goes to step g to judge the ON state of the main switch. If the main switch is off in step g, step h
Then, the engine control is turned off to end the process, and if the main switch is turned on, the process proceeds to step c.

If any of the engine speed Ne, the intake manifold pressure Pi, and the exhaust pipe pressure Pe is "0" in step d, or if the seawater rise H is "specified water level", the temperature of the catalyst is determined in step i. Ts is detected, and the catalyst temperature Ts is determined in step j. The temperature Ts of the catalyst is a temperature at which the catalyst is deteriorated when the temperature is higher than the temperature Ts when the catalyst is immersed in seawater. When the temperature Ts of the catalyst is equal to or lower than the predetermined value, the process proceeds to step e, in which the closing operation of the on-off valve is detected and the above-described operation is performed. When the temperature Ts of the catalyst is equal to or higher than a predetermined value, the on-off valve is closed in step k to prevent water from entering the exhaust passage and prevent seawater from touching the catalyst in the exhaust passage.

Then, in step c, the engine speed Ne, the intake manifold pressure Pi, the exhaust pipe pressure Pe, and the seawater rise H are detected in step c.
Thereafter, the operation described above is performed.

FIGS. 4 and 5 show a more specific embodiment of the water backflow prevention means in the exhaust passage. FIG. 4 is a schematic configuration diagram of the water backflow prevention means in the exhaust passage, and FIG. It is a sectional view taken along the line V. In this embodiment, an on-off valve 30 is provided in the exhaust passage 15 so as to be openable and closable around a rotary shaft 70 as a fulcrum, and the on-off valve 30 is connected via a link 71 to a rotating body 73 that is rotated by a motor 72. . This motor 72
Is supplied with power from a battery 32 and is operated by a drive circuit 63 controlled by the control means 33. Exhaust the passage 15 on-off valve 30 and on opposite sides of the heat seal 74 is provided, opening and closing valve 30 is closed to close the passage 15a in close contact with the heat seal 74, to prevent water from entering the exhaust passage 15 As a result, seawater is prevented from touching the catalyst 20 in the exhaust passage 15. Further, when the opening / closing valve 30 is opened, the exhaust gas is exhausted through the passage 15a.

6 and 7 show a more specific embodiment of the water backflow prevention means in the exhaust passage. FIG. 6 is a schematic configuration diagram of the water backflow prevention means in the exhaust passage, and FIG. 7 is a VII of FIG. -VII
FIG. In this embodiment, an upper passage 15b and a lower passage 15c are provided in the exhaust passage 15, and the upper passage 15b is provided.
Lower passage 15c and the opposed heat seal 74 on the side are provided for communication passage 7 which communicates the upper and lower lower-stage passage 15c further
5 are provided.

An opening / closing valve 30 is provided between the upper passage 15b and the lower passage 15c so as to be movable in the vertical direction. Both ends of the opening / closing valve 30 are connected to the motor 7 via a pair of links 76.
Is connected to a rotating body 77 which rotates in two. Motor 72
When the on-off valve 30 is closed, the passage 15b is closed in close contact with the heat-resistant seal 74 to prevent water from entering the exhaust passage 15 and prevent seawater from touching the catalyst 20 in the exhaust passage 15. . Further, when the opening / closing valve 30 moves downward and opens, the exhaust gas passes through the passage 15b, and further the communication passage 75
Exhausted through.

Another embodiment of the present invention will be described with reference to FIG. FIG. 8 is a schematic view of an intake / exhaust device for a ship propulsion device. In this embodiment, the components designated by the same reference numerals as those in FIG. In this example,
An auxiliary exhaust passage 16 is provided so as to communicate with the exhaust passage 15. An auxiliary exhaust port 17 of the auxiliary exhaust passage 16 is formed in the casing 4, and the auxiliary exhaust port 17 is located in the navigation hollow. An on-off valve 30 is provided between the sub exhaust passage 16 and the catalyst 20.

In this embodiment, when the engine is stopped, the water level rises to the water level L3 during rapid deceleration, and the position of the catalyst 20 is arranged in the exhaust passage portion 15 below this water level. The positive pressure in the exhaust passage 15 decreases,
Although seawater tries to flow backward from the exhaust passage 15, it detects that the stop state has changed, and the on-off valve 30 is closed to prevent water from reaching the catalyst. Alternatively, the catalyst 20
The on-off valve 30 is closed until the temperature of (3) falls below a predetermined value.

Still another embodiment of the present invention will be described with reference to FIG. FIG. 9 is a schematic view of an intake / exhaust device for a ship propulsion device. In this embodiment, the components designated by the same reference numerals as those in FIG. In this embodiment, the auxiliary exhaust passage 16 is provided so as to communicate with the exhaust passage 15. However, the auxiliary exhaust port 17 of the auxiliary exhaust passage 16 is formed in the casing 4, and the auxiliary exhaust port 17 is provided in the hollow navigation. positioned. An on-off valve 30 is provided between the exhaust port 13 and the upstream side of the catalyst 20 arranged in the exhaust passage 15.

In this embodiment, when the engine is stopped, the water level rises to the water level L3 at the time of sudden deceleration, and the position of the catalyst 20 is arranged in the exhaust passage portion 15 below this water level. The positive pressure in the exhaust passage 15 decreases,
Although seawater tries to flow backward from the exhaust passage 15, it detects that the stop state has changed, and the control means 33 activates the opening / closing valve operating means 31, whereby the opening / closing valve 30 is closed and the exhaust passage 1
The pressure inside 5 is prevented from decreasing and water is prevented from reaching the catalyst. Alternatively, the on-off valve 30 is closed until the temperature of the catalyst 20 drops below a predetermined value for a predetermined time.

FIG. 10 shows another embodiment of the water backflow prevention means in the exhaust passage, and FIG. 10 is a schematic configuration diagram of the water backflow prevention means in the exhaust passage. In this embodiment, the drive shaft 7
A helical spline portion 7a is provided on the way of the rotary spline portion 7a, and the rotary up-and-down moving body 8 is fitted into the helical spline portion 7a.
0 and the outer periphery of the needle bearing 81 and the outer periphery of the needle bearing 81, and the rotation-sensing moving body 8 composed of the vertical moving body 82.
3 and a rotation detecting means 85 including a spring 84 are arranged.

The vertical moving body 8 of the rotation detecting means 85.
2 is connected to a lever 87 via a stay 86, and a stay 89 of the opening / closing valve 30 is connected to the lever 87 via a link 88.
Are connected. The on-off valve 30 is provided in the exhaust passage 15 so as to be openable and closable around a pivot shaft 70 as a fulcrum. Exhaust the passage 15 on-off valve 30 and on opposite sides of the heat seal 74 is provided, opening and closing valve 30 is closed to close the passage 15a in close contact with the heat seal 74, to prevent water from entering the exhaust passage 15 As a result, seawater is prevented from touching the catalyst 20 in the exhaust passage 15. Further, when the opening / closing valve 30 is opened, the exhaust gas is exhausted through the passage 15a.

When the drive shaft 7 rotates, the rotary vertical moving body 80 tries to maintain its position by the inertial force, whereby the rotary vertical moving body 80 is lifted by the action of the helical spline, and this movement is caused by the needle bearing. 8
1 and is further transmitted to the vertical moving body 82 on the outer periphery thereof. The ascending force due to the action of the helical spline balances with the spring force 84, and the vertical movement of the rotation sensing moving body 83 is stopped. After that, the drive shaft 7 and the rotary vertical moving body 80 only rotate integrally, and the vertical moving body 82 stands still. The movement of the vertical moving body 82 is transmitted to the on-off valve 30 via the link 88, and the on-off valve 30 for the engine stop time is closed.

FIG. 11 shows another embodiment of the means for preventing backflow of water in the exhaust passage, and FIG. 11 is a schematic block diagram of the means for preventing backflow of water in the exhaust passage. In this embodiment, the exhaust passage 15
The catalyst 20 is arranged in the above, and the opening / closing valve 30 is arranged on the downstream side of the catalyst 20. The on-off valve 30 is provided in the exhaust passage 15
A donut-shaped rubber 90 arranged around the rubber, a spring 91 arranged inside the rubber 90, and the rubber 9
0 and a pipe 93 connected to the intake passage 12 on the downstream side of the check valve 92. A cooling water passage 15d is provided on the upstream side of the opening / closing valve 30, and cooling water is supplied from the cooling water passage 15d to cool the rubber 90 of the opening / closing valve 30.

The piston 94 reciprocates due to the operation of the engine 5, whereby the crank chamber 95 becomes negative pressure,
This negative pressure causes the rubber 9 of the on-off valve 30 to pass through the pipe 93.
0 is pulled against the spring 91, and exhaust gas is discharged. When the operation of the engine 5 is stopped, the piston 9
4 does not reciprocate, and the crank chamber 95 becomes atmospheric pressure. Due to this atmospheric pressure, the rubber 90 of the on-off valve 30 is closed by the spring 91 via the pipe 93. As described above, when the engine 5 is rotating and the crank chamber pressure is negative, the open / close valve 30 opens, and when the negative pressure for stopping the engine 5 disappears, the open / close valve 30 closes.

FIG. 12 shows another embodiment of the means for preventing backflow of water in the exhaust passage, and FIG. 12 is a schematic block diagram of the means for preventing backflow of water in the exhaust passage. In this embodiment, the exhaust passage 15
An on-off valve 30 similar to that of the embodiment of FIGS. 4 and 5 and the embodiment of FIG. Stay 89 of on-off valve 30
A rod 97 is connected to the rod 97, and a piston 98 provided on the rod 97 is slidably provided on the cylinder 99, and is constantly urged by a spring 100 in a direction to pull the rod 97. The cylinder 99 is connected by a pipe 101 to a downstream side of a check valve 92 arranged in the intake passage 12 of the engine 5.

The piston 94 reciprocates due to the operation of the engine 5, which causes the crank chamber 96 to have a negative pressure,
When this negative pressure causes the cylinder 99 to have a negative pressure via the pipe 101, the rod 97 advances against the spring 100, the on-off valve 30 opens, and exhaust gas is discharged. When the operation of the engine 5 is stopped, the piston 94 does not reciprocate and the crank chamber 96 becomes the atmospheric pressure. Due to this atmospheric pressure, the cylinder 99 becomes the atmospheric pressure via the pipe 101 and the spring 100 causes the rod 97 to move. It is retracted, which causes the on-off valve 30 to close. Thus, when the engine 5 is rotating and the crank chamber pressure is negative, the open / close valve 30 opens, and when the negative pressure for stopping the engine 5 disappears, the open / close valve 3
0 closes.

FIG. 13 shows another embodiment of the water backflow prevention means in the exhaust passage, and FIG. 13 is a schematic configuration diagram of the water backflow prevention means in the exhaust passage. In this embodiment, the exhaust passage 15
An upper passage 15e and a lower passage 15f are formed on the downstream side of the catalyst 20 disposed in the upper passage 15e and the lower passage 15f.
The on-off valve 30 is arranged between f. The on-off valve 30 includes a valve 110 and a spring 111.
1 always urges the valve 110 toward the upper passage 15e.

The pressure of the exhaust gas, which is one of the energies of the engine 5, causes the valve 110 of the on-off valve 30 to move to the lower passage 15f against the spring 111 and open to exhaust the exhaust gas. When the engine 5 stops, the pressure of the exhaust gas disappears and the spring 111 closes the exhaust passage 15 by bringing the valve 110 into close contact with the upper passage 15e.

14 and 15 show another embodiment of the means for preventing backflow of water in the exhaust passage, FIG. 14 is a schematic block diagram of the means for preventing backflow of water in the exhaust passage, and FIG. 15 is XV-XV of FIG. It is sectional drawing which follows the line.

In this embodiment, an exhaust expansion chamber 121 is provided in the inner casing 120 provided below the engine 5 of the propulsion device 1, and an exhaust pipe 122 is arranged in the exhaust expansion chamber 121. An exhaust passage 123 communicates with the exhaust expansion chamber 121, and the exhaust passage 123 communicates with an underwater exhaust port. A water communication hole 124 is formed on the side surface of the inner casing 120 below the exhaust passage 123, and a communication hole 125 to the atmosphere is formed in the exhaust passage 123. This on-off valve 30 is a link 12
It is connected to the float 127 via 6.

Therefore, when the engine 5 is operated, the exhaust gas pushes the on-off valve 30 through the exhaust pipe 122, and further passes from the exhaust expansion chamber 121 through the exhaust passage 123 to the float 1.
Press 27 to eject.

When the operation of the engine 5 is stopped and the pressures of the exhaust pipe 122, the exhaust expansion chamber 121, and the exhaust passage 123 decrease, seawater enters the exhaust passage 123 through the water communication hole 124, and the float 127 floats. This float 1
27 is lifted, and the opening / closing valve 30 is connected via the link 126.
Is pressed and closed.

16 and 17 show another embodiment of the water backflow prevention means in the exhaust passage. FIG. 16 is a schematic view of the intake / exhaust device of the ship propulsion device, and FIG. 17 is the water backflow prevention means in the exhaust passage. 2 is a schematic configuration diagram of FIG.

In this embodiment, the opening / closing valve 30 is connected to the intake passage 1
The second throttle valve 130 also serves as the second throttle valve 130, and the seal member 131 is attached to the outer periphery of the throttle valve 130. The throttle valve 130 is connected to a solenoid 133 via a wire 132. When the engine stop switch 134 is closed, the coil 137 is excited by the operation of the drive circuit 136 that is supplied with power from the battery 135, which causes the solenoid 133 to operate, returning the throttle valve 130 to the closed position when the engine is stopped, After the engine is started, the throttle valve 130 is configured to rotate between an idle opening degree that is slightly opened and a fully opened position.

[0076]

As described above, the invention according to claim 1 is
After detecting the engine stop, by operating the exhaust passage water backflow prevention means so as to keep the on-off valve closed for at least a predetermined time, seawater flows back into the exhaust passage with a simple structure and the catalyst in the exhaust passage is To prevent the catalyst from deteriorating due to dissolved ions in the seawater and deteriorating the exhaust gas purification function.

According to the second aspect of the present invention, the on-off valve is arranged between the catalyst in the exhaust passage and the underwater exhaust port, and the on-off valve is kept closed. Prevent seawater from coming into contact with.

According to the third aspect of the present invention, the on-off valve is arranged between the catalyst in the exhaust passage and the exhaust port of the engine, and the on-off valve is kept closed so that the seawater flows back into the exhaust passage. Prevents seawater from touching the catalyst.

According to the fourth aspect of the present invention, the on-off valve is arranged in the intake passage of the engine, and the on-off valve is kept closed to prevent the sea water from flowing back into the exhaust passage so that the catalyst touches the sea water. To prevent.

According to the fifth aspect of the invention, after detecting the actuation of the deceleration operation means or the deceleration exceeding a predetermined degree, the exhaust passage in-water backflow prevention means is operated so as to keep the on-off valve closed for at least a predetermined time. This prevents seawater from flowing back into the exhaust passage and touching the catalyst in the exhaust passage with a simple structure, and prevents the catalyst from deteriorating due to dissolved ions in the seawater and deteriorating the exhaust purification function. .

According to the sixth aspect of the invention, based on the water detection information of the water level detection means in the exhaust passage, the exhaust passage water backflow prevention means is operated so as to keep the on-off valve closed for at least a predetermined time. With such a structure, seawater does not flow back into the exhaust passage and the seawater does not come in contact with the catalyst in the exhaust passage, and the catalyst is prevented from deteriorating due to dissolved ions in the seawater and deteriorating the exhaust purification function.

According to a seventh aspect of the present invention, the catalyst temperature detecting means for detecting the temperature of the catalyst is provided, and when the catalyst temperature becomes lower than a predetermined value, the on-off valve is returned from the closed state to the open state so that the seawater is discharged into the exhaust passage. Prevents backflow of seawater and contact of seawater with the catalyst.

According to the eighth aspect of the present invention, an opening / closing valve that opens when the exhaust pressure in the exhaust passage becomes large is disposed in the middle of the exhaust passage, and this opening / closing valve also serves as deceleration sensing means and exhaust water backflow prevention means. With a simple structure that does not use a special means for preventing backflow of water in the exhaust passage, it prevents seawater from flowing back into the exhaust passage and coming into contact with the catalyst.

According to a ninth aspect of the present invention, a simple structure in which the operation of the drive shaft of the engine is utilized by opening and closing the on-off valve by the moving body that moves in the drive shaft direction in conjunction with the rotation of the drive shaft of the engine. This prevents seawater from flowing back into the exhaust passage and coming into contact with the catalyst.

According to the tenth aspect of the invention, the on-off valve is opened when the negative pressure becomes large due to the negative pressure in the intake passage or the crank chamber,
The open / close valve has a simple structure that utilizes the negative pressure of the intake passage or the crank chamber, and prevents seawater from flowing back into the exhaust passage and coming into contact with the catalyst.

In the eleventh aspect of the invention, the float is used to detect the water level of the outside water which is communicated with the outside water, and the open / close valve is opened / closed based on the float, and the open / close valve is closed when the water level becomes higher,
The simple structure prevents seawater from flowing back into the exhaust passage and coming into contact with the catalyst.

[Brief description of drawings]

FIG. 1 is a schematic view of an intake / exhaust device for a ship propulsion device.

FIG. 2 is a control block diagram of an intake / exhaust device for a boat propulsion device.

FIG. 3 is an operation flowchart of an intake / exhaust device for a ship propulsion device.

FIG. 4 is a schematic configuration diagram of a water backflow prevention unit in the exhaust passage.

5 is a cross-sectional view taken along the line VV of FIG.

FIG. 6 is a schematic configuration diagram of a water backflow prevention unit in the exhaust passage.

7 is a sectional view taken along line VII-VII of FIG.

FIG. 8 is a schematic view of an intake / exhaust device for a ship propulsion device.

FIG. 9 is a schematic view of an intake / exhaust device for a ship propulsion device.

FIG. 10 is a schematic configuration diagram of a means for preventing backflow of water in the exhaust passage.

FIG. 11 is a schematic configuration diagram of a means for preventing backflow of water in the exhaust passage.

FIG. 12 is a schematic configuration diagram of a means for preventing backflow of water in the exhaust passage.

FIG. 13 is a schematic configuration diagram of a means for preventing backflow of water in the exhaust passage.

FIG. 14 is a schematic configuration diagram of a means for preventing backflow of water in the exhaust passage.

15 is a sectional view taken along line XV-XV in FIG.

FIG. 16 is a schematic view of an intake / exhaust device for a ship propulsion device.

FIG. 17 is a schematic configuration diagram of a means for preventing backflow of water in the exhaust passage.

[Explanation of symbols]

1 propulsion machine 5 engine 12 Intake passage 14 Underwater exhaust port 15 Exhaust passage 18 Intake and exhaust passage 20 catalyst 30 open / close valve 33 Control means 34 Exhaust passage water backflow prevention means 42 Engine stop detection means

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Ashi Abe 1400, Shimbashi-cho, Hamamatsu-shi, Shizuoka Sanshin Kogyo Co., Ltd. (56) References JP-A-55-14977 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) F01N 7/12

Claims (11)

(57) [Claims] 1. A propulsion unit mounted on a ship is provided with an engine, and has an intake / exhaust passage from an intake passage of the engine to an underwater exhaust port that opens into the water through the engine and the exhaust passage. In an intake / exhaust device for a ship propulsion device, in which a catalyst is arranged, an engine stop detecting means for detecting stop of the engine, an exhaust passage water backflow preventing means having an opening / closing valve in the middle of the intake / exhaust passage, and an engine stop. And a control means for controlling the exhaust passage water backflow prevention means to operate so as to keep the on-off valve closed for at least a predetermined time after the detection. . 2. The intake / exhaust device for a marine vessel propulsion apparatus according to claim 1, wherein the on-off valve is arranged between the catalyst in the exhaust passage and an underwater exhaust port. 3. The intake / exhaust device for a marine vessel propulsion device according to claim 1, wherein the on-off valve is arranged between the catalyst in the exhaust passage and an exhaust port of an engine. 4. The intake / exhaust device for a marine propulsion device according to claim 1, wherein the on-off valve is arranged in an intake passage of the engine. 5. A propulsion unit mounted on a ship is provided with an engine, and has an intake / exhaust passage from an intake passage of the engine to an underwater exhaust port opened to the water through the engine and the exhaust passage, and the exhaust passage. In an intake / exhaust device for a marine propulsion device, in which a catalyst is arranged, a deceleration operation means for decelerating the propulsion device or a deceleration sensing means for detecting deceleration of the propulsion device, and an opening / closing valve in the middle of the intake / exhaust passage. After detecting the operation of the water reverse flow in the exhaust passage and the deceleration operation means or the deceleration exceeding a predetermined degree, the water reverse flow prevention means in the exhaust passage is operated so as to keep the on-off valve closed for at least a predetermined time. And a control means for controlling as described above. 6. A propulsion unit mounted on a ship is provided with an engine, and has an intake / exhaust passage from an intake passage of the engine to an underwater exhaust port opened to the water through the engine and the exhaust passage. In an intake / exhaust device for a ship propulsion device in which a catalyst is arranged, a water level sensor in the exhaust passage, which is arranged below the catalyst position to detect the water level in the exhaust passage, and an opening / closing valve is provided in the middle of the intake / exhaust passage. Based on the exhaust passage water backflow prevention means and the water detection information of the exhaust passage water level detection means, control is performed to operate the exhaust passage water backflow prevention means so as to keep the on-off valve closed for at least a predetermined time. An intake / exhaust device for a marine vessel propulsion device. 7. A catalyst temperature sensing means for sensing the temperature of the catalyst is provided, and the opening / closing valve is returned from the closed state to the open state when the catalyst temperature falls below a predetermined temperature by the control means. The intake / exhaust device for a marine vessel propulsion device according to claim 1 or claim 5 or claim 6. 8. A propulsion unit mounted on a ship is provided with an engine, and has an intake / exhaust passage from an intake passage of the engine to an underwater exhaust port opened to the water through the engine and the exhaust passage, the exhaust passage In the intake / exhaust device for a ship propulsion device in which a catalyst is arranged, the exhaust gas also serves as a deceleration sensing means for detecting deceleration of the propulsion device and an exhaust passage water backflow prevention means having an opening / closing valve in the middle of the intake / exhaust passage. An on- off valve that opens when the exhaust pressure in the passage becomes large is placed in the middle of the exhaust passage.
The on-off valve is an exhaust gas formed so as to project into the exhaust passage.
Upper passage located on the upstream side and lower passage located on the exhaust downstream side
A valve disposed between the valve and the lower passage.
A spring which is arranged to constantly bias the valve in the direction of the upper passage.
When the exhaust pressure in the exhaust passage is large,
The valve causes the exhaust pressure to resist the spring and lower the valve.
Move to the passage side to open the exhaust passage,
Lowering causes the spring to bring the valve closer to the upper passage
An intake / exhaust device for a boat propulsion device, characterized in that the exhaust passage is configured to be closed . 9. The opening / closing valve is opened / closed by a moving body that moves in the drive shaft direction in association with the rotation of the drive shaft of the engine. Intake and exhaust system for ship propulsion equipment. 10. A propulsion unit mounted on a ship is provided with an engine, and has an intake / exhaust passage extending from an intake passage of the engine to an underwater exhaust port opened to the water through the engine and the exhaust passage. In an intake / exhaust device for a marine propulsion device in which a catalyst is disposed in the intake / exhaust device, an opening / closing valve arranged in the middle of the intake / exhaust passage and the opening / closing valve are opened when the negative pressure becomes large due to the negative pressure in the intake passage or the crank chamber. An intake / exhaust device for a marine propulsion device, which is characterized in that 11. A propulsion unit mounted on a ship is provided with an engine, and has an intake / exhaust passage extending from an intake passage of the engine to an underwater exhaust port which opens into the water through the engine and the exhaust passage. In the intake / exhaust device for a ship propulsion device in which a catalyst is arranged, an opening / closing valve arranged in the middle of the intake / exhaust passage, and a float that communicates with external water and senses the water level of the external water,
An intake / exhaust device for a ship propulsion device, characterized in that the on-off valve is opened and closed based on this float, and the on-off valve is closed when the water level rises above.