JP3692562B2 - Water injection propulsion boat cooling system - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a cooling device for a water jet propulsion boat.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, water jet propulsion boats that propel a ship using reaction force caused by water injection have been widely used. As an example of this water jet propulsion boat, a conventional water bike is shown in FIG. FIG. 4 is a view of the water bike as viewed from above, and is a configuration diagram inside the hull.
[0003]
The watercraft a is provided in an engine c mounted on a hull b, a suction pipe part d provided at a rear part of the hull b and having a water suction opening that opens to the bottom of the ship, and disposed in the suction pipe part d. a pump unit e which is driven by c and introduces water into the suction pipe unit d from the water inlet, and an exhaust system f connected to the engine c. In this water bike a, water introduced into the suction pipe part d by the pump part e is jetted backward by the jet nozzle f to obtain a propulsive force. The pump part e is mainly composed of an impeller e1 provided at the rear end of a drive shaft g connected to the engine c, and a stator e2 disposed behind the impeller e1 to rectify water.
[0004]
Usually, in this type of water bike a, the water pressure in the vicinity of the stator e2 is high, so that the cooling water is sent to the engine c and the exhaust system f using this high water pressure. That is, the cooling water hose h is connected to the stator e2, and the cooling water hose h is branched into two to supply the cooling water to the engine c and the exhaust system f. The cooling water sent to the engine c passes through the cylinder portion c1 and the cylinder head portion c2, and then passes through the cooling water passage i and is discharged from the side portion of the hull b. On the other hand, the cooling water sent to the exhaust system f cools the exhaust passages of the exhaust manifold j, the exhaust chamber k, and the exhaust muffler m and is discharged to the outside of the hull b.
[0005]
[Problems to be solved by the invention]
However, the conventional water bike a cooling device has the following problems. That is, since there is only one cooling water inlet for the cooling water hose h in the stator e2, the amount of cooling water supplied to the engine c or the exhaust system f is less likely to be appropriate on a hot day. Also, the branching of the cooling water hose h makes it difficult to supply an appropriate amount of cooling water to the exhaust system f, and the handling of the cooling water hose h becomes complicated.
[0006]
Further, since the cooling system of the engine c and the cooling system of the exhaust system f are connected, the cooling system of the engine c and the exhaust system f cannot be considered separately because of the cooling water flowing through the exhaust muffler m. . For example, as shown in FIG. 4, even if the thermostat p is attached to the cylinder head part c2, if the supply of cooling water to the cooling system of the engine c is stopped, a large amount of cooling water flows into the exhaust system f. Since the resistance may increase and affect the output of the engine c, it is difficult to control the temperature of the cooling system of the engine c.
[0007]
The present invention has been made in view of the above-described conventional problems, and can simplify the cooling water passage, supply an appropriate amount of cooling water to the engine and the exhaust system, and without affecting the exhaust system. An object of the present invention is to provide a cooling device for a water injection propulsion boat that can control the temperature of an engine cooling system.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, the present invention has the following configuration.
That is, the invention of claim 1 includes an engine mounted on the hull, a suction pipe provided at the rear of the hull with a water inlet opening at the bottom of the hull, and the engine disposed in the suction pipe. And a pump part that introduces water into the suction pipe part from the water inlet and an exhaust system connected to the engine, and the water introduced into the suction pipe part by the pump part is injected backward in water jet propulsion boat promoted by, when provided with two cooling water passages independent from each other for guiding the water flowing through the pump unit in each of the engine and the exhaust system together, the cooling water passage leading to the exhaust system the exhaust manifold The water jet propulsion watercraft cooling device is connected to the water jet propulsion boat.
[0009]
The invention of claim 2, the cooling system of the engine which communicates with the cooling water passage for the engine is a cooling device for water jet propulsion boat as claimed in claim 1, characterized in that the thermostat is provided .
The invention according to claim 3, wherein the thermostat is a cooling device for water jet propulsion boat according to claim 2, characterized in that it is installed in the cylinder head.
Invention of Claim 4 is the cooling device of the water-injection propulsion boat according to Claim 1, wherein the cooling water flowing through the cooling water passage is taken from a cooling water intake provided in the stator. .
[0010]
According to the first aspect of the present invention, the two cooling water passages for guiding the water flowing through the pump section to the engine and the exhaust system are independent from each other. The absolute amount can be increased, and an appropriate amount of cooling water can be supplied to the engine and the exhaust system. Further, since the cooling water passage is not branched, the handling of the members constituting the cooling water passage is also simplified.
[0011]
According to the invention of claim 2, the temperature of the cooling system in the engine can be controlled by the thermostat, and at the same time, the two cooling water passages leading to the engine and the exhaust system are independent from each other. Regardless of the open / closed state of the cooling system, an appropriate amount of cooling water is supplied to the exhaust system.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a side view of a water bike according to the present embodiment, FIG. 2 is a plan view of the water bike, and FIG. 3 is a view of the water bike seen from above and is a configuration diagram inside the hull.
[0013]
As shown in FIG. 1, a water bike (an example of a water jet propulsion boat) 2 according to the present embodiment includes an engine 6 mounted on a hull 4 and a water inlet 8 that opens to the bottom of the hull, and is provided at the rear of the hull 4. The suction pipe unit 10 is connected to the engine 6, the pump unit 12 which is disposed in the suction pipe unit 10 and is driven by the engine 6 to introduce water into the suction pipe unit 10 through the water inlet 8. The exhaust system 14 (refer FIG. 3) is provided, and the water introduced in the suction pipe part 10 by the pump part 12 is injected back and propelled by the injection nozzle 11.
[0014]
In the cooling device according to the present embodiment, as shown in FIG. 3, two independent cooling water hoses (corresponding to cooling water passages) for guiding water flowing through the pump unit 12 to the engine 6 and the exhaust system 14 respectively. 16, 18 are provided. A thermostat 20 is provided in the cooling system of the engine 6 that communicates with the cooling water hose 16 for the engine 6.
[0015]
Hereinafter, the structure of each part of this embodiment is demonstrated.
As shown in FIGS. 1 and 2, the hull 4 includes footrests 4a and 4a on both left and right sides, and a seat 22 is provided between the left and right footrests 4a and 4a. A handle 24 is provided at the front of the hull 4, and the driver can change the direction of traveling by changing the water injection direction by operating the handle 24.
[0016]
As shown in FIG. 1, the engine 6 is a two-cycle engine that is mounted inside the hull 4 that is positioned almost directly below the handle 24 and is installed vertically. The engine 6 has a cylinder part 6a and a cylinder head part 6b mounted and fixed on the cylinder part 6a. As shown in FIG. 3, the exhaust system 14 includes an exhaust manifold 14a connected to the exhaust port of the engine 6, an exhaust chamber 14b connected to the downstream end of the exhaust manifold 14a, and a feed from the exhaust chamber 14b. The exhaust muffler 14c is configured mainly to mute the exhaust noise of the exhaust, and the exhaust pipe 14d extends laterally from the exhaust muffler 14c through the hull 4 and discharges exhaust from the rear end of the hull 4 to the rear. The
[0017]
As shown in FIG. 1, the suction pipe portion 10 is formed in the lower rear part of the hull 4, and after sucking water upward and rearward from the water inlet 8, the sucked water is opened substantially horizontally at the rear end. It has a shape that leads to A drive shaft 26 connected to the crankshaft of the engine 6 protrudes into the suction pipe portion 10 from the front wall inclined rearward of the suction pipe portion 10.
[0018]
As shown in FIG. 1, the pump unit 12 is fixed to the rear end of the drive shaft 26 and is disposed immediately after the impeller 12a, and an impeller 12a that sucks and pressurizes water from the water suction port 8 into the pipe unit 10. And a stator 12b that rectifies water pressurized by the impeller 12a. Immediately after the stator 12b, the injection nozzle 11 that ejects water rectified by the stator 12b toward the rear of the hull 4 is provided.
[0019]
As shown in FIG. 3, the cooling water intake ports 16a and 18a of the two cooling water hoses 16 and 18 are respectively provided on the left and right sides of the stator 12b. Each of the two cooling water hoses 16 and 18 extends forward from the cooling water intake ports 16a and 18a through a unique path, and one cooling water hose 16 is connected to a predetermined portion of the cylinder portion 6a, and the other The cooling water hose 18 is connected to the exhaust manifold 14 a, and the cooling water hoses 16 and 18 communicate with the cooling systems of the engine 6 and the exhaust system 14, respectively.
[0020]
As shown in FIG. 3, the thermostat 20 is installed in the cylinder head portion 6b of the engine 6. For example, when the temperature of the cooling system in the engine 6 (the cylinder portion 6a and the cylinder head portion 6b) is equal to or lower than a set value. The supply of cooling water into the engine 6 is stopped. The cooling water in the engine 6 passes through the thermostat 20 of the cylinder head portion 6 b, and then is guided to the side of the hull 4 through the cooling water passage 28 and is discharged to the outside of the hull 4. The cooling water guided to the exhaust manifold 14a by the cooling water hose 18 flows through the exhaust chamber 14b, the exhaust muffler 14c, and the exhaust pipe 14d sequentially after the exhaust manifold 14a is cooled, and is discharged backward together with the exhaust. The
[0021]
According to the watercraft 2 of the present embodiment having the above-described configuration, the cooling water hose 16 for the engine 6 and the cooling water hose 18 for the exhaust system 14 are mutually independent paths. The absolute amount of cooling water is increased, and an appropriate amount of cooling water can be supplied to the engine 6 and the exhaust system 14. Further, since the cooling water hoses 16 and 18 are not branched, the handling of the cooling water hoses 16 and 18 can be simplified.
[0022]
In addition, the temperature control of the cooling system in the engine 6 can be performed by the thermostat 20 and, at the same time, the two cooling water hoses 16 and 18 are independent from each other, regardless of whether the cooling system of the engine 6 by the thermostat 20 is open or closed. An appropriate amount of cooling water can be constantly supplied to the exhaust system 14.
[0023]
The present embodiment is a preferred embodiment of the present invention, and the technical scope of the present invention is not limited to this embodiment.
[0024]
【The invention's effect】
As described above, according to the present invention, the cooling water passage can be simplified and an appropriate amount of cooling water can be supplied to the engine and the exhaust system. In addition, the temperature of the engine cooling system can be managed without affecting the exhaust resistance.
[Brief description of the drawings]
FIG. 1 is a side view of a water bike according to the present embodiment.
FIG. 2 is a plan view of a water bike according to the present embodiment.
FIG. 3 is a view of the water bike according to the present embodiment as viewed from above, and is a configuration diagram inside the hull.
FIG. 4 is a view of a water bike according to a conventional example as viewed from above, and is a configuration diagram inside a hull.
[Explanation of symbols]
2 Water bike (an example of a water jet propulsion boat)
4 Hull 6 Engine 8 Water inlet 10 Suction pipe part 12 Pump part 14 Exhaust system 16 Cooling water hose for engine (corresponding to cooling water passage)
18 Cooling water hose for exhaust system (equivalent to cooling water passage)
20 Thermostat

Claims (4)

An engine mounted on the hull, a suction pipe provided at the rear of the hull with a water inlet opening at the bottom of the hull, and disposed in the suction pipe part and driven by the engine through the water inlet. In a water-injection propulsion boat that includes a pump unit that introduces water into a suction pipe unit and an exhaust system that is connected to the engine, and that propels the water introduced into the suction pipe unit by the pump unit by propelling it backward. ,
Rutotomoni with two cooling water passages independent from each other for guiding the water flowing through the pump unit in each of the engine and the exhaust system, cooling water passage leading to the exhaust system is characterized in that it is connected to an exhaust manifold Cooling device for water jet propulsion boats. The cooling system of the engine which communicates with the cooling water passage for the engine, cooling system water injection propulsion boat according to claim 1, characterized in that the thermostat is provided. The cooling device for a water injection propulsion boat according to claim 2 , wherein the thermostat is installed in a cylinder head portion.   The cooling device for a water injection propulsion boat according to claim 1, wherein the cooling water flowing through the cooling water passage is taken from a cooling water intake port provided in the stator.

Images