KR20150076854A - Closed cooling system for outboard engine - Google Patents

Abstract

The present invention relates to a cooling system, and more particularly, to a cooling system for cooling a marine outboard unit by using water outside the hull including sea water, By cooling the outboard motor by using a closed cooling system so as not to directly touch the engine cylinder block, corrosion of internal parts of the outboard motor is prevented and the life of the engine is increased. In addition, a separate thermostat, Line to control the cooling water circulation, thereby enabling quick cooling of the outboard engine, accelerating the engine faster than the engine warming up, optimizing the temperature of the engine, increasing the engine efficiency And indirect cooling system for outboard motor that can achieve fuel savings A.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cooling system, and more particularly, to an indirect cooling system for an outboard fan that can increase the life of an engine by applying an indirect cooling system to a marine outboard engine without using a conventional sea water cooling system.

Generally, a yacht or a large boat uses an engine installed inside the hull as a main power source. However, smaller-sized boats are mainly equipped with an outboard engine (small outboard engine) Has gained as much as 150 horsepower at 2 horsepower.

Such marine outboard motors, like ordinary gasoline or diesel engines, burn gasoline or diesel fuel to cause reciprocating motion of the pistons inside the cylinder. By converting the reciprocating force into rotational force and transferring it to the propeller, .

As a result, the temperature inside the outboard motor which is subjected to high-speed reciprocating motion and rotational motion is increased to a very high temperature over time. Therefore, it is necessary to properly cool the outboard motor to prevent damage to the engine. The cooling system of the outboard motor is very important because the cooling system of the outboard motor can be controlled depending on the size, rotation speed, and output of the outboard motor depending on the performance of the cooling system.

In the conventional art related to the cooling of the outboard motor, Korean Patent No. 10-356456 can be referred to. In general, when water outside the hull is blown into the outboard motor by using a pump or exhaust gas, system) water cooling method is widely used.

However, such a water-cooling system draws water out of the hull to the outside of the outboard, so there is a problem that the inside of the outboard is contaminated each time depending on the degree of contamination of the outside water.

In addition, when the outboard unit is operated in seawater, the seawater mixed with salt components flows into the outboard unit, which causes seawater to reach the cylinder, the pump, the cooling water path, and the engine body, thereby causing corrosion and shortening the life of the engine. Lt; / RTI >

In order to prevent this, it is necessary to wash the inside of the outboard motor and the inside of the engine with fresh water every time after using the outboard motor, and it is very troublesome. In addition, if left for a long time after the outboard motor runs, .

In order to solve such a problem, an air-cooled outboard fan such as the Korean Patent No. 10-360929 may be used.

However, since the air has a significantly smaller heat capacity than water, the cooling efficiency of the air cooling system deteriorates the efficiency of cooling the outboard fan at a high temperature compared to the water cooling system, thereby causing problems with the engine durability such as overheating of the outboard fan or melting of some parts.

Korean Patent Registration No. 10-0356456 [Description of the Invention: Cooling Apparatus in Outboard Unit, Announcement Date: October 25, 2002]

An object of the present invention to solve the above problems is to provide a method of cooling an outboard motor using water outside the hull including seawater to increase the efficiency and to prevent the water outside the hull from coming into direct contact with the engine cylinder block, cooling system is used to cool the outboard motor to prevent corrosion of the inner parts of the outboard motor and to improve the life of the engine.

Further, in addition to the application of the indirect cooling system, a separate thermostat, a temperature sensor, and a bypass line are applied to improve the efficiency of the outboard engine by controlling the circulation of the cooling water.

In order to achieve the above object, an indirect cooling system for outboard motor according to the present invention comprises: a cylinder head and a cylinder block for transmitting power by providing a space in which fuel can be burned; a cooling water circulating unit for circulating the cylinder head and the cylinder block a water pump for supplying power to circulate the coolant in the cylinder block, a heat exchanger for cooling the hot coolant passing through the cylinder head and the cylinder block using water outside the hull, one side connected to the water pump, A first inlet pipe connected to the head to transmit cooling water flowing out of the water pump to the cylinder head, one side connected to the water pump, and the other side connected to the cylinder block, A second inlet pipe connected to the cylinder head, A second outflow pipe connected to the cylinder block for transferring high temperature cooling water flowing out of the cylinder block, one end connected to the heat exchanger, the other end connected to the heat exchanger, A fresh water inflow pipe connected to the first outflow pipe and the second outflow pipe for transferring high-temperature cooling water flowing out from the cylinder head and the cylinder block to the heat exchanger, one side connected to the heat exchanger and the other side connected to the water pump, A fresh water outlet pipe for transmitting low-temperature cooling water flowing out of the heat exchanger to the water pump, a seawater inlet pipe connected to the heat exchanger at one side for introducing water outside the ship into the heat exchanger, And a seawater outlet pipe for discharging the water inside the hull to the outside, The water outflow pipes are connected to each other inside the heat exchanger and the seawater inflow pipe and the sea water outflow pipe are connected to each other inside the heat exchanger so that the cooling water passing through the clean water inflow pipe and the fresh water outflow pipe and the seawater inflow pipe and the sea water outflow And the water outside the hull passing through the pipe is heat exchanged while being independently closed.

In addition, it is preferable that one side is connected to the fresh water inflow pipe and the other side is connected to the fresh water outflow pipe, and furthermore, a bypass line is provided to provide a passage through which the cooling water can move.

The first thermostat may further include a first thermostat connected to the fresh water inflow pipe and the bypass line to control the flow of cooling water transferred to the fresh water inflow pipe and the bypass line, And a first temperature sensor for measuring the temperature of the cooling water flowing through the first cooling pipe.

The second thermostat may further include a second thermostat connected to the second outflow pipe to adjust the flow rate of the cooling water flowing out of the cylinder block, and a second thermostat for measuring the temperature of the cooling water flowing in the second thermostat, It is preferable to further include a temperature sensor.

The indirect cooling system for outboard motor according to the present invention further comprises a crank pulley for converting the linear motion of the cylinder head and the cylinder block into rotational motion and a fly wheel connected to the crank pulley for rotational motion, The wheel may be integrally formed with the crank pulley.

In addition, it is preferable that the crank pulley, the water pump, and the generator are connected to each other by a single FEAD belt and rotate at the same time, and the FEAD belt further includes a generator and an idler, It is preferable to use a poly V-belt.

Further, the inside of the heat exchanger is preferably made of a copper pipe, and the outside of the heat exchanger is preferably made of a 6000 series aluminum-magnesium-silicon (Al-Mg-Si) alloy.

The effect of the present invention with the above-described structure is that, unlike the conventional outboard motor in which water outside the hull is directly introduced into the engine and the cylinder and cooled, a separate heat exchanger is mounted, It is possible to prevent corrosion of components such as an engine and a cylinder, and it is possible to increase the service life of the engine.

In addition, a separate bypass line and a thermostat are installed on the flow path of the cooling water from the cylinder to the heat exchanger so that the flow of the cooling water can be selectively controlled, thereby enabling more efficient cooling.

In particular, by installing a separate temperature sensor in addition to the summer stat, the coolant temperature can be measured at any time and the circulation path of the coolant can be set according to a predetermined temperature range, so that rapid cooling can be achieved. Accelerating the engine, optimizing the temperature of the engine to increase the thermal efficiency, thereby increasing the engine output and reducing the fuel consumption.

1 is a schematic view showing an outboard motor to which an indirect cooling system according to the present invention is applied;
2 is a perspective view showing an outboard motor to which an indirect cooling system according to the present invention is applied;
3 is a plan view showing the outboard motor to which the indirect cooling system of the present invention is applied.
4 is a perspective view showing a heat exchanger and a flow path used in an indirect cooling system of the present invention.
FIG. 5 is a perspective view showing a thermostat used in the indirect cooling system of the present invention. FIG.
6 to 8 are partially enlarged views showing a part of an indirect cooling system of the present invention.
9 is a schematic view showing the flow of cooling water during the initial warm-up of the outboard motor to which the indirect cooling system of the present invention is applied.
10 is a schematic view showing the flow of cooling water during operation after warm-up of the outboard motor to which the indirect cooling system of the present invention is applied.

Hereinafter, the indirect cooling system for the outboard motor of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a schematic view showing an outboard motor to which the indirect cooling system according to the present invention is applied, FIG. 2 is a perspective view showing the outboard motor to which the indirect cooling system according to the present invention is applied, and FIG. 3 is a plan view showing the outboard motor to which the indirect cooling system according to the present invention is applied .

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a marine outboard motor which is a small size engine mainly used for small size boats, The overall shape, function, and combustion process of the outboard unit are not significantly different from those of conventional outboard units. However, the outboard unit has the greatest features such as a method for cooling a hot outboard unit and a flow path of a cooling water .

The indirect cooling system for outboard motor according to the present invention includes a cylinder head (10) and a cylinder block (20) for providing a space in which fuel can be burned to transmit power, a cylinder block A water pump 30 for providing a power for circulating the coolant, a heat exchanger 40 for cooling high temperature cooling water having passed through the cylinder lid head and the cylinder block 20 by using water outside the hull, A first inlet pipe 11 connected to the water pump 30 and connected to the cylinder head 10 to transfer the cooling water flowing out of the water pump 30 to the cylinder head 10, A second inlet pipe 21 connected to the water pump 30 and connected to the cylinder block 20 to transfer the cooling water discharged from the water pump 30 to the cylinder block 20, Is connected to the cylinder head (10) A first outlet pipe 12 for delivering high temperature cooling water flowing out of the cylinder head 10 and a second outlet pipe 12 having one side connected to the cylinder block 20 to deliver high temperature cooling water flowing out of the cylinder block 20, 2 outlet pipe 22 is connected to the heat exchanger 40 and the other end is connected to the first outlet pipe 12 and the second outlet pipe 22 to connect the cylinder head 10 and the cylinder block 20 A cool water inflow pipe 41 for transferring high temperature cooling water flowing out from the heat exchanger 40 to the heat exchanger 40, one side connected to the heat exchanger 40 and the other side connected to the water pump 30, 40 is connected to the heat exchanger 40 so that the water outside the hull is flowed into the heat exchanger 40. The water pump 30 is connected to the cold water discharge pipe 42, One side of the sea water inflow pipe 43 is connected to the heat exchanger 40, Wherein the fresh water inflow pipe 41 and the fresh water outflow pipe 42 are connected to each other inside the heat exchanger 40 and the seawater inflow pipe 43 is connected to the inside of the heat exchanger 40, And the seawater outlet pipe 44 are connected to each other inside the heat exchanger 40 so that the cooling water passing through the fresh water inlet pipe 41 and the fresh water outlet pipe 42 and the cooling water passing through the seawater inlet pipe 43 and the sea water outlet pipe 42, And the water outside the hull passing through the hull (44) is heat exchanged while being independently closed.

Unlike the conventional outboard motor cooling system, the cooling water (fresh water) passing through the cylinder head 10, the cylinder block 20 and the water pump 30 and the seawater flowing in and out from the outside of the hull are completely And the cooling process is performed inside the closed (closed) heat exchanger 40 located on the side of the cylinder block 20.

As the cooling water is cooled by using the indirect cooling method, it is possible to prevent intrusion of polluted water containing mixed impurities or seawater containing salt into the cylinder and the engine, thereby preventing contamination and corrosion of internal parts of the engine And the life of the engine can be further increased.

The inside of the heat exchanger 40 is made of a copper pipe resistant to corrosion and the outside of the heat exchanger 40 is made of a 6000 series aluminum-magnesium-silicon (Al-Mg-Si) Accordingly, it is possible to prevent the internal corrosion of the heat exchanger 40 and to prevent the corrosion of the heat exchanger 40 due to the seawater that frequently comes into contact with the outside of the heat exchanger 40.

Furthermore, the present invention includes a first thermostat (60) which further includes a bypass line (50) on a flow path through which cooling water is circulated and which can control the cooling water flowing in the pipeline, The operating efficiency and the thermal efficiency of the engine can be further increased.

4, which is a perspective view illustrating a heat exchanger 40 and a flow path used in an indirect cooling system according to the present invention, and FIG. 5, which is a perspective view showing a summator stator used in the indirect cooling system of the present invention, One side of the line 50 is connected to the fresh water inflow pipe 41 and the other side is connected to the fresh water outflow pipe 42 so that the cooling water flowing out from the cylinder head 10 and the cylinder block 20 flows into the water- Pass line 50 as shown in FIG.

The first thermostat 60 is connected to the fresh water inflow pipe 41 and the bypass line 50 at the same time so that the fresh water inflow So that the flow of the cooling water transferred to the pipe (41) and the bypass line (50) can be controlled.

Therefore, in the initial operation of the outboard engine, that is, in the situation where the cooling water needs to be heated for quick warm-up of the engine, the cooling water does not flow to the heat exchanger 40 but flows along the bypass line 50, The cooling water can be circulated only in the engine, so that it is possible to achieve a faster acceleration force as well as a fuel saving effect.

6, the first thermostat 60 further includes a first temperature sensor 61 for measuring the temperature of the cooling water flowing in the first thermostat 60. In the first thermostat 60, The opening and closing of the first thermostat 60 is controlled according to the result of the temperature measurement of the cooling water by the first temperature sensor 61 and the flow is controlled by determining cooling or bypass of the cooling water.

More detailed operation of the present invention will be described later.

7 and 8, the second thermostat 70 and the second temperature sensor 71 are connected to the second outlet pipe 22, which is a passage through which the cooling water flows out from the cylinder block 20, The temperature of the cooling water flowing in the second summer thermostat 70 is measured through the second temperature sensor 71 so that the high temperature cooling water passing through the inside of the cylinder block 20 flows into the cylinder block 20) to a certain degree of flow rate.

Therefore, since the high-temperature cooling water flow rate flowing out of the cylinder block 20 can be adjusted as needed, it is possible to optimize the engine temperature to a preset temperature, and to increase the engine output by increasing the thermal efficiency It is effective.

In addition, when the outboard engine is warmed up in the cold external condition, the high temperature cooling water that has passed through the cylinder block 20 is not discharged due to the operation of the second thermostat 70, So that warm-up of the outboard engine can be accomplished more quickly, which is eco-friendly, and fuel consumption and durability can be improved.

2 and 3, the indirect cooling system for an outboard motor according to the present invention includes a crank pulley 80 for converting the linear motion of the cylinder head 10 and the cylinder block 20 into rotational motion, And a fly wheel connected to the crank pulley 80 to rotate. The fly wheel is formed integrally with the crank pulley 80.

The indirect cooling system for outboard motor according to the present invention further includes a generator 90 and an idler 91. One side of the crank pulley 80, the water pump 30 and the generator 90 is connected to one FEAD belt 92 To be simultaneously rotated.

The plurality of pulleys (the crank, the water pump 30, the generator 90, and the idler 91) as described above are positioned at the top of the outboard motor and rotated at the same time. Unlike the conventional outboard motor, It is preferable to design such that it can be optimized according to the span length and wrap angle between the pulleys.

An FEAD (Front End Accessory Drive) belt that connects the crank pulley 80, the water pump 30, and the generator 90 together to rotate them simultaneously reduces the noise generated between the pulleys, It is preferable to apply a poly V-belt so as to maximize the strength of the belt.

Hereinafter, the operation of the indirect cooling system for the outboard motor of the present invention will be described in detail.

FIG. 9 is a schematic view showing the flow of cooling water during the initial warm-up of the outboard motor to which the indirect cooling system according to the present invention is applied, and FIG. 10 is a schematic view showing the flow of cooling water in the after- warm-up operation of the outboard motor to which the indirect cooling system of the present invention is applied.

Conventional conventional outboard motors supply coolant (sea water) directly to the engine to cool the engine. Therefore, even when the engine is not warmed up during the initial operation, the cooling water is uniformly supplied to lower the efficiency of the engine. There was a problem of shortening the life span.

However, according to the present invention, the initial driving of the engine as shown in FIG. 9 is controlled so as not to operate the first thermostat 60 so that the cooling water discharged from the cylinder head 10 and the cylinder block 20 So that the cooling water can be prevented from being cooled and the engine can be quickly warmed up.

In addition, in order to further improve warm-up and efficiency at the time of initial driving of the engine, the second summer thermostat 70 is substantially closed, so that only a very small amount of high- temperature cooling water flows out of the cylinder block 20, Since the high-temperature cooling water remains in the cylinder block 20 to rapidly heat the engine, the warm-up time can be remarkably shortened and the fuel consumption and engine durability can be improved.

When it is detected by the first temperature sensor 61 and the second temperature sensor 71 that the engine and the cooling water have reached an appropriate temperature of about 80 degrees Celsius through the engine warm-up process as described above, As the direction of the first thermostat 60 is adjusted and the second thermostat 70 is fully opened as described above, the high temperature cooling water can flow to the heat exchanger 40 without flowing into the bypass line 50 .

The temperature of the engine and the cooling water continuously increases due to the continuous operation of the cylinder and the engine so that the cooling water having passed through the cylinder head 10 and the cylinder block 20 can pass through the heat exchanger 40 And the cooling water is cooled by exchanging heat with the low temperature sea water supplied to the heat exchanger 40 in a closed state and the cooling water whose temperature is lowered is supplied to the cylinder head 10 and the cylinder block 20 to circulate.

Therefore, according to the present invention, it is possible to maintain the optimum engine temperature by controlling the temperature of the precise cooling water (fresh water) by the two temperature sensors and the flow rate of the cooling water by the two thermostats, to improve the thermal efficiency, And the lifetime can be further increased.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the inventions. Will be clear to those who have knowledge of.

10: Cylinder head
11: first inlet pipe 12: first outlet pipe
20: Cylinder block
21: second inlet pipe 22: second outlet pipe
30: water pump
40: heat exchanger
41: fresh water inflow tube 42: fresh water outflow tube
43: Seawater inflow pipe 44: Seawater discharge pipe
50: Bypass line
60: first thermostat 61: first temperature sensor
70: second thermostat 71: second temperature sensor
80: crank pulley
90: alternator
91: idler
92: FEAD belt

Claims (10)

A cylinder head (10) and a cylinder block (20) which provide space for fuel to burn and transmit power;
A water pump 30 for providing power to circulate the coolant circulating through the cylinder head 10 and the cylinder block 20;
A heat exchanger (40) for cooling high temperature cooling water passing through the cylinder head (20) and the cylinder head (20) using water outside the hull;
A first inlet pipe (11) connected to the water pump (30) at one side and connected to the cylinder head (10) to transfer cooling water discharged from the water pump (30) to the cylinder head (10);
A second inlet pipe 21 connected to the water pump 30 at one side and connected to the cylinder block 20 to transfer the cooling water discharged from the water pump 30 to the cylinder block 20;
A first outflow pipe (12) having one side connected to the cylinder head (10) and delivering high temperature cooling water flowing out of the cylinder head (10);
A second outlet pipe (22) connected to the cylinder block (20) at one side for transferring high temperature cooling water flowing out of the cylinder block (20);
One end of which is connected to the heat exchanger 40 and the other end of which is connected to the first outflow pipe 12 and the second outflow pipe 22 and connected to the cylinder head 10 and the cylinder block 20, A fresh water inflow pipe (41) for delivering the fresh water to the heat exchanger (40);
The other end is connected to the heat exchanger 40 and the other end is connected to the water pump 30 and connected to the fresh water discharge pipe 42 for transferring low temperature cooling water flowing out from the heat exchanger 40 to the water pump 30. [ ;
A seawater inlet pipe (43) connected to the heat exchanger (40) on one side to introduce water outside the hull to the heat exchanger (40);
A seawater discharge pipe (44) having one side connected to the heat exchanger (40) and discharging water inside the heat exchanger (40) to the outside of the hull; / RTI >
The fresh water inflow pipe 41 and the fresh water outflow pipe 42 are connected to each other in the heat exchanger 40 and the seawater inflow pipe 43 and the seawater inflow pipe 44 are connected to each other in the heat exchanger 40 The cooling water passing through the clean water inflow pipe 41 and the fresh water outflow pipe 42 and the water outside the ship passing through the seawater inflow pipe 43 and the sea water outflow pipe 44 are closed the indoor heat exchanger being configured to perform heat exchange while maintaining a closed state.
The method according to claim 1,
Further comprising a bypass line (50) connected to the clean water inflow pipe (41) on the one side and to the fresh water discharge pipe (42) on the other side to provide a passage through which the cooling water can move. Indirect cooling system.
3. The method of claim 2,
A first thermostat 60 connected to the fresh water inflow pipe 41 and the bypass line 50 so as to control the flow of the cooling water transferred to the fresh water inflow pipe 41 and the bypass line 50; Further comprising: an outdoor cooling system for outdoor use.
The method of claim 3,
Further comprising: a first temperature sensor (61) for measuring the temperature of the cooling water flowing in the first thermostat (60).
3. The method of claim 2,
Further comprising a second sumat stat (70) connected to the second outlet pipe (22) to control a flow rate of cooling water flowing out of the cylinder block (20).
6. The method of claim 5,
Further comprising a second temperature sensor (71) for measuring a temperature of cooling water flowing in the second summer thermostat (70).
3. The method according to claim 1 or 2,
A crank pulley 80 for converting the linear motion of the cylinder head 10 and the cylinder block 20 into rotational motion; And
Further comprising a flywheel connected to the crank pulley (80) for rotational movement,
Wherein the flywheel is integrally coupled to the crank pulley (80).
8. The method of claim 7,
Further comprising a generator (90) and an idler (91)
Wherein one side of the crank pulley (80), the water pump (30), and the generator (90) is connected to one FEAD belt (92) and rotated at the same time.
9. The method of claim 8,
Wherein the FEAD belt (92) is a poly V-belt for noise reduction and power transmission efficiency enhancement.
The method according to claim 1,
Characterized in that the inside of the heat exchanger (40) is made of a copper pipe and the outside of the heat exchanger (40) is made of a 6000 series aluminum-magnesium-silicon (Al-Mg-Si) alloy. Indirect cooling system.

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