JPH0717487A - Cooling device for marine internal combustion engine - Google Patents

Abstract

PURPOSE:To prevent overheat of an internal combustion engine by easily removing suspended matter stuck on a suction opening through a simple structure without depending upon man power. CONSTITUTION:In a marine internal combustion engine cooling device 1, which is contrived to cool the internal combustion engine 6 by means of sucking seawater by a suction pump 5 through a suction opening 2 provided in a ship bottom 3 an injection nozzle for injecting fluid towards the direction opposite to the seawater suction direction is provided on the suction opening 2. An injection pump 13 for injecting seawater from the injection nozzle is also provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cooling device for an internal combustion engine for a ship which can prevent overheating of the internal combustion engine.

[0002]

2. Description of the Related Art Generally, in a cooling system for an internal combustion engine for a ship, seawater is sucked by a pump 32 from a suction port 31 provided in a ship bottom 30 as shown in FIG.
It is sent to the heat exchanger 34 via 3 to cool the internal combustion engine 35. However, since seawater is sucked from the suction port 31 in the above configuration, when a suspended matter of seawater adheres to the suction port 31, the suction force of the pump 32 blocks the suction port 31 and the suction amount of seawater decreases. However, there is a problem that the internal combustion engine 35 is insufficiently cooled. Then, if the insufficient cooling state continues, the heat radiation temperature of the internal combustion engine 35 rises and causes overheating, which is a factor that significantly reduces the propulsive force of the ship.

Therefore, conventionally, a flow rate sensor (shown by a chain double-dashed line) 36 for detecting the flow rate is provided between the intake passage of seawater, for example, between the filter 33 and the pump 32, and the flow rate sensor 36 indicates the intake amount of seawater. When a decrease is detected, a lamp (not shown) is flashed to give an overheat warning.

Moreover, as shown in FIG.
In the cooling water supply device for marine internal combustion engine No. 00, an internal combustion engine 42 is passed from a main water intake 40 at the bottom of the ship via a pump 41.
The auxiliary water suction port 44 is provided separately from the main water suction passage 43 leading to.
Then, when the main water inlet 40 is blocked by the suspended matter, the auxiliary water inlet 44 is operated by operating the switching valves 45a and 45b.
It has been proposed that auxiliary water passages 46a, 46b are provided from the main intake port 40 to the main intake port 40 via the internal combustion engine 42 so that the cooling water is discharged from the main intake port 40 to remove suspended matters.

[0005]

However, even if the flow rate sensor 36 detects a decrease in the intake amount of seawater and blinks the lamp, a person must remove the suspended matter that blocks the intake port 31. , Its removal work is troublesome,
There is a problem that work takes time. That is, since the suction port 31 is provided in the bottom 30 of the ship, the ship is once stopped and a person dives into the sea to remove suspended matters. For this reason, especially in a large ship, not only is the diving distance increased and the burden on the operator is increased, but
It takes a considerable amount of time to stop ships and dive.

Further, in the above cooling device, even if the lamp is blinked to warn of overheating, for example, in the full throttle state, the cooling temperature of the internal combustion engine 35 becomes abnormally high and the suspended matter is removed. May cause overheating before. Then, if the internal combustion engine 35 suddenly stops due to the overheating, there is a problem that it may not be possible to restart immediately after the overheating because each part of the internal combustion engine 35 is in an overheated state.

Further, in the latter cooling water supply device for a marine internal combustion engine, the switching valves 45a and 45b and the auxiliary water passage 46 are provided.
Since it is necessary to provide a and 46b, there is a problem that the configuration becomes complicated.

The present invention has been made to solve the above-mentioned problems, and an object thereof is to easily remove a floating substance that blocks an intake port with a simple structure without relying on a human hand to provide an internal combustion engine. An object of the present invention is to provide a cooling device for an internal combustion engine for a ship, which can prevent overheating.

[0009]

In order to solve the above problems, according to the invention of claim 1, cooling water is sucked by a pump through a suction port provided at the bottom of the ship, and the sucked cooling water is used. In a cooling device for an internal combustion engine for a ship configured to cool an internal combustion engine by means of the above, an injection nozzle which is provided at the intake port and injects a fluid in a direction opposite to the direction of intake of cooling water; And an injection pump for controlling the discharge.

Further, the cooling device for an internal combustion engine for a ship is provided with a flow rate detecting means for detecting a flow rate of cooling water sucked from an intake port, and based on the detection result of the flow rate detecting means, drives the injection pump. Control means for controlling may be provided.

Further, the cooling device for an internal combustion engine for a ship is
A battery that serves as a power source of the injection pump and a generator may be provided, and a switching unit that switches the drive of the injection pump by the battery after driving the injection pump for a predetermined time.

[0012]

According to the present invention having the above-mentioned structure, the suspended matter that closes the suction port is removed by injecting the fluid from the injection nozzle by the injection pump in the direction opposite to the suction direction of the cooling water. To be done. Therefore, the suspended matter that closes the intake port can be easily removed with a simple structure without relying on human hands, and overheating of the internal combustion engine can be reliably prevented.

Further, in the invention according to the second aspect, when the suspended matter adheres to the suction port and is blocked, the flow rate of the cooling water to be sucked decreases. When the flow rate detecting means detects this decrease in the flow rate, the control means drives the injection pump based on the detection signal to inject the fluid from the injection nozzle in the direction opposite to the suction direction of the cooling water. Then, the jet of the fluid removes the suspended matter that blocks the suction port. Therefore, since the fluid is ejected according to the decrease in the flow rate of the cooling water, the reliability of the suspended matter removal can be improved.

According to the third aspect of the invention, the battery and the generator are used as the power source of the injection pump, and the switching means switches the drive to the generator after the battery is driven for a predetermined time. Therefore, the fluid is rapidly ejected from the injection pump by the battery and continuously by the generator.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment embodying the present invention is shown in FIG.
It will be described with reference to FIG. As shown in FIG. 1, a cooling device 1 for an internal combustion engine for a ship is provided with an intake port 2 for intake of seawater as cooling water, and the intake port 2 is provided in a ship bottom portion 3 of the ship. There is. The suction port 2 is connected to a heat exchanger 7 provided in the internal combustion engine 6 via a pipe 4 and a suction pump 5. A filter 8 and a water pressure sensor 9 as a flow rate detecting means for detecting the water pressure of the inhaled seawater are arranged in the pipe 4 between the suction pump 5 and the suction port 2. Then, the internal combustion engine 6 is cooled by exchanging heat with the seawater (illustrated by the solid line arrow) that is sucked from the suction port 2 by the suction pump 5 and the excess foreign matter is removed by the filter 8 by the heat exchanger 7. It has become so. The seawater after the heat exchange is discharged to the outside of the ship by a pipe (not shown).

As shown in FIG. 2, the suction port 2 is formed in a funnel shape, and the tip of the suction port 2 is an opening 3a of the ship bottom 3.
It is fixed by welding. Further, the opening 2a of the suction port 2 is covered with a cap 10 formed in a mesh shape (not shown) so that a suspended matter cannot enter the suction port 2 when inhaling seawater. . Further, a jet nozzle 11 for jetting seawater is arranged on one side of the suction port 2, and a tip portion 11a thereof faces the cap 10 side.
The tip 11a is capable of jetting seawater onto almost the entire surface of the cap 10.

As shown in FIG. 1, the injection nozzle 11 is connected to an injection pump 13 via an injection pipe 12. The injection pump 13 is connected to a supply pipe 14, and the supply pipe 14 is connected to a supply port 15 arranged in the ship bottom portion 3, and the supply port 15 is covered with a cap (not shown). Then, the seawater (illustrated by the two-dot chain line arrow) supplied from the supply port 15 by the injection pump 13 is sprayed from the spray nozzle 11 so that the suspended matter attached to the surface of the cap 10 is removed. Has become.

Next, the electrical construction of the cooling device 1 for the marine vessel internal combustion engine 6 will be described. As shown in FIG. 1, the water pressure sensor 9 detects the water pressure of seawater passing through the pipe 4 and outputs the detection signal to the throttle controller 16. The water temperature sensor 17 is provided in the internal combustion engine 6 and
The temperature of the seawater for cooling is detected, and the detection signal is output to the throttle controller 16 as the control means.

The throttle controller 16 controls the opening and closing of a throttle valve (not shown) of the internal combustion engine 6 based on the detection signals of the water pressure sensor 9 and the water temperature sensor 17. That is, the throttle controller 16 detects the detection signal of the water pressure sensor 9 when the seawater is lower than the predetermined water pressure and the water temperature sensor 17 when the seawater is higher than the predetermined water temperature.
The idle signal (IDLE) is output on the basis of the detection signal of 1 to force the internal combustion engine 6 into the idle state. The predetermined water pressure and the predetermined water temperature are values that are limits to causing the internal combustion engine 6 to overheat, and are values that have been experimentally or experimentally obtained in advance. Further, the throttle controller 16 includes a timer (not shown), which counts a preset time from the start of the idle state, and when the water temperature does not fall below a predetermined water temperature after the counting,
A stop signal is output based on the detection signal of the water temperature sensor 17 to stop the internal combustion engine 6. This set time is a duration of an abnormal water temperature at which each part of the internal combustion engine 6 becomes overheated and restarting becomes difficult after overheating, and is a value that is experimentally or experimentally obtained in advance. Further, the throttle controller 16 causes the alarm buzzer 18 to generate an alarm sound at the same time when the idle signal or the stop signal is output, and also outputs the seawater injection signal to the power supply switching controller 19.

The power source switching controller 19 switches to the electrically connected state between the battery 20 and the injection pump 13 based on the input of the injection signal. Also, the power supply switching controller 19
Has a timer (not shown) and counts a preset discharge time of the battery 20 from the start of switching. or,
The power supply switching controller 19 switches to an electrically connected state between the generator 21 and the injection pump 13 when the injection signal is continuously input after the count of a timer (not shown).
That is, the count time of the power supply switching controller 19 is the time when the minimum charging voltage required to restart the internal combustion engine 6 can be secured even if the injection pump 13 is driven by discharging the battery 20. Also, the power supply switching controller 1
The reference numeral 9 causes the notification buzzer 22 to generate a notification sound at the same time when the electric generator 21 and the injection pump 13 are switched to an electrically connected state.

The generator 21 is provided with a battery (not shown), and is driven by the battery to drive the injection pump 13 based on the switching of the power source switching controller 19.

Next, the operation of the cooling device 1 for the internal combustion engine 6 for a ship constructed as described above will be described. First, the internal combustion engine 6 is in an operating state, and the seawater that has been sucked from the suction port 2 by the suction pump 5 and has had excess foreign matter removed by the filter 8 is sent to the heat exchanger 7 and cooled. And

When seawater suspended matter adheres to the cap 10 of the suction port 2, the suction force of the suction pump 5 causes the suction port 2 to move.
Is blocked and the intake of seawater decreases. Then, due to this decrease in the amount of inhalation, the water pressure of seawater begins to decrease,
The cooling water temperature of the internal combustion engine 6 begins to rise. When the seawater drops below the predetermined water pressure and rises above the predetermined water temperature, the throttle controller 16 outputs an idle signal based on the detection signals of the water pressure sensor 9 and the water temperature sensor 17 to force the internal combustion engine 6 to operate. Let it idle. At the same time, the throttle controller 16 causes the alarm buzzer 18 to generate an alarm sound to notify that the idle state has been entered, and outputs an injection signal to the power supply switching controller 19 as switching means.

Based on the input of the injection signal, the power supply switching controller 19 switches to the electrically connected state between the battery 20 and the injection pump 13, and at the same time starts the counting of a timer (not shown). Then, the injection pump 13 is driven by the battery 20 as a power source, seawater is supplied from the supply port 15, and seawater is injected from the injection nozzle 11 via the supply pipe 14 and the injection pipe 12. Then, the suspended matter attached to the cap 10 is removed. Then, the throttle controller 16 stops the output of the injection signal based on the detection signal of the water pressure increase from the water pressure sensor 9 and the detection signal of the water temperature decrease from the water temperature sensor 17, and at the same time when the internal combustion engine 6 is in the original operation state. Make it the same. Further, the power supply switching controller 19 determines that the battery 2
The electrical connection state between 0 and the injection pump 13 is released.

When the charging voltage of the battery 20 has dropped and the timer has finished counting, when the injection signal continues to be input, the power supply switching controller 19 electrically connects the generator 21 and the injection pump 13. Switch to. At the same time, the alarm buzzer 22 generates an alarm sound to notify that the generator 21 has switched to driving the injection pump 13. Then, the injection pump 13 is driven by using the generator 21 as a power source, and seawater is injected from the injection nozzle 11.

If the timer (not shown) of the throttle controller 16 counts for a preset time from the start of the idle state and the temperature is not lower than the predetermined water temperature, the throttle controller 16 outputs a stop signal to output the internal combustion engine 6 To stop.

As described above, in this embodiment, the injection nozzle 11 is provided in the suction port 2 and the seawater is injected toward the cap 10 by the injection pump 13, so that the cap is simple. It is possible to easily remove the suspended matter clogging 10 without using human hands and prevent overheating of the internal combustion engine 6. Therefore, it is no longer necessary for a person to dive into the sea to remove suspended solids once the ship is stopped.

Further, a drop in the water pressure of seawater is detected by the water pressure sensor 9, and an increase in the cooling water temperature is detected by the water temperature sensor 17, and the throttle controller 16 is based on both detection signals.
Has made the internal combustion engine 6 idle or stopped. Therefore, it is possible to prevent the increase of the cooling water temperature and prevent the decrease of seawater due to the adherence of the suspended matter to the cap 10, and the overheating of the internal combustion engine 6 due to the increase of the cooling temperature of the internal combustion engine 6. As a result, the internal combustion engine 6 does not suddenly stop in the full throttle state, and even if the internal combustion engine 6 is once stopped, the internal combustion engine 6 does not become overheated, so that the engine can be restarted.

Further, the power source for driving the injection pump 13 is initially the battery 20, and after a lapse of a predetermined time, the generator 21 is switched to, so that the seawater is rapidly and continuously injected into the suction port 2. be able to.

Further, since the driving time of the injection pump 13 by the battery 20 is set to the time when the minimum charging voltage required for restarting the internal combustion engine 6 can be secured, the battery 20 is used for other than driving the injection pump 13. It becomes possible to do.

The present invention is not limited to the above-mentioned embodiment, but may be made as follows without departing from the spirit of the present invention. (1) In the above embodiment, the throttle controller 16 causes the alarm buzzer 18 to generate an alarm sound based on the detection signal of the water pressure sensor 9 and the detection signal of the water temperature sensor 17, and Although the injection signal is output to the power supply switching controller 19,
Instead, a push button is provided, and when an alarm sound is generated by the alarm buzzer 18, the passenger pushes the push button,
The injection signal may be output to the power supply switching controller 19.

(2) The suction port 2 may be provided with a plurality of injection nozzles 11. When a plurality of jet nozzles 11 are provided, seawater can be jetted over a wide range, which facilitates removal of suspended solids.

(3) In the above embodiment, the water pressure sensor 9 is used to detect the water pressure of the seawater sucked in through the suction port 2. However, a flow sensor may be used instead to detect the seawater flow rate.

(4) Although the alarm buzzer 18 and the alarm buzzer 22 are provided in the above embodiment, an alarm lamp and an alarm lamp or a combination of a buzzer and a lamp may be used instead. (5) Driving the injection pump 13 is performed by the battery 20 and the generator 2.
Although 1 and 2 are switched to each other, only one of them may be switched.

[0035]

As described above in detail, according to the present invention, it is possible to prevent the overheat of the internal combustion engine with a simple structure by easily removing the suspended matter adhering to the intake port without using human hands. It has an excellent effect.

According to the second aspect of the present invention, the flow rate detecting means for detecting the flow rate of the cooling water sucked through the suction port, and the control for controlling the drive of the injection pump based on the detection result of the flow rate detecting means. By including the means, the fluid is ejected according to the flow rate of the cooling water, so that it is possible to enhance the reliability of the suspended matter removal for closing the suction port.

Further, according to the invention of claim 3, a battery and a generator which are power sources of the injection pump, and a switching means for switching to the drive by the generator after the injection pump is driven by the battery for a predetermined time are provided. As a result, the fluid can be injected from the injection pump more quickly by the battery and continuously by the generator.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram showing a cooling device for an internal combustion engine for a ship according to the present invention.

FIG. 2 is a schematic partial cross-sectional view showing an intake port.

FIG. 3 is a schematic configuration diagram showing a conventional cooling device for a marine internal combustion engine.

FIG. 4 is a schematic diagram showing another conventional cooling water supply device for a marine internal combustion engine.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Cooling device, 2 ... Suction port, 3 ... Ship bottom part, 5 ... Suction pump, 6 ... Internal combustion engine, 9 ... Water pressure sensor as flow rate detection means, 11 ... Injection nozzle, 13 ... Injection pump, 16 ... As control means Throttle controller, 19 ... power supply switching controller as switching means, 20 ... battery, 21
…Generator.

Claims (3)

[Claims] 1. A cooling device for an internal combustion engine for a ship, wherein cooling water is sucked by a pump through a suction port provided at a bottom of a ship, and the internal combustion engine is cooled by the sucked cooling water. A cooling device for a marine internal combustion engine, comprising: an injection nozzle, which is provided in the injection port for injecting a fluid in a direction opposite to a suction direction of cooling water; and an injection pump for injecting the fluid from the injection nozzle. 2. A cooling device for an internal combustion engine for a ship, comprising: a flow rate detecting means for detecting a flow rate of cooling water sucked through an intake port; and a drive of the injection pump based on a detection result of the flow rate detecting means. The cooling device for an internal combustion engine for a ship according to claim 1, further comprising a control unit for controlling. 3. The cooling device for an internal combustion engine for a ship comprises a battery and a generator, which serve as a power source for the injection pump, and a switching means for switching to the drive by the generator after the injection pump is driven by the battery for a predetermined time. The cooling device for an internal combustion engine for a ship according to claim 1, which is provided.