JP2522462Y2 - Seawater flow control device for cooling marine engines - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention is used when the hull jumps into the air like a power boat or when the temperature of fresh water for cooling the marine engine is low. The present invention relates to an apparatus for controlling a seawater flow.

[Prior art] Conventionally, as a marine engine, seawater taken in from a seawater inlet for cooling fresh water for cooling the engine is sent to a heat exchanger via a seawater pump via an intercooler, a marine gear / oil cooler, etc. Therefore, a cooling circuit using seawater that cools the cooling water by exchanging heat with seawater is known. The cooling water is circulated through the engine, heat exchanger, water-cooled turbocharger, etc. by a water pump.At the time of warm-up operation, the thermostat provided at the outlet of the cooling water from the cylinder head causes the water to enter the engine that has not yet warmed up. Cold water does not flow.

[Problem to be Solved by the Invention] However, in the above cooling circuit, when the hull jumps into the air, the seawater pump runs idle, which may damage the seawater pump.

In addition, the intake air temperature becomes too low due to seawater flowing inside the intercooler and the heat exchanger during the warm-up operation,
In addition, since the cooling water and the exhaust manifold are cooled by the heat exchanger, there is a problem that the time required for warm-up is increased. As a result, the compression temperature of the engine does not rise sufficiently,
There is a problem that unburned white smoke gas is easily discharged due to delay in ignition of fuel.

An object of the present invention is to cool a marine engine that can prevent idling of a seawater pump, shorten warm-up time during warm-up operation, and reduce white smoke during warm-up operation. It is an object of the present invention to provide a seawater flow control device.

[Means for Solving the Problems] The configuration of the present invention for achieving the above object will be described with reference to FIGS. 1 and 2 corresponding to the embodiment.

The present invention includes pipes 14 and 19 connecting between the seawater intake 11 and the cooling system of the engine 37, and the seawater intake 1 provided in the pipe 14.
The seawater taken in from 1 is supplied to the engine 37 via lines 14 and 19.
A seawater pump 13 for feeding the cooling water of the engine 37, a heat exchanger 18 for exchanging the fresh water for cooling of the engine 37 and the exhaust gas with seawater to cool the seawater, and a seawater flowing out of the heat exchanger 18 This is an improvement of a marine engine having a seawater outlet 23 for discharging water.

The characteristic configuration is such that a bypass is connected at one end to the pipeline 26, the other end is connected to the pipeline 14 located between the seawater inlet 11 and the seawater pump 13, and communicates the seawater intake 11 and the seawater outlet 23. It can be switched to connect the bypass line 27 and the seawater pump 13 or to connect the seawater intake port 11 and the seawater pump 13 at the connection between the pipeline 27 and the pipeline 14 at the other end of the bypass pipeline 27. The first switching valve 31 is provided at a connection portion of one end of the bypass pipe 27 to the pipe 26, and connects the heat exchanger 18 and the bypass pipe 27 or connects the heat exchanger 18 and the seawater discharge port 23. Switch valve 32 which can be switched as described above, and a pressure sensor which is provided in the pipeline 14 located between the seawater intake 11 and the first switching valve 31 in the pipeline 14 and detects the pressure of seawater in the pipeline 14 28,
Engine rotation sensor 53 that detects the rotation speed of engine 37
A temperature sensor 44 for detecting the temperature of fresh water for cooling the engine 37, and a controller 54 for controlling the switching valves 31 and 32 based on the detection output of the pressure sensor 28 or the detection outputs of both the rotation sensor 53 and the temperature sensor 44. And where it is.

[Operation] When the hull jumps into the air and the pressure sensor 28 detects a pressure within the set pressure range, the controller 54 switches the first and second switching valves 31 and 32, and circulates seawater through the bypass pipe 27. Let it. When the hull that jumps into the air lands and the pressure sensor 28 detects a pressure higher than the above range, the controller 54 switches the first and second switching valves 31 and 32, and the seawater pump 13 causes the seawater to flow from the seawater inlet 11. Intake and discharge through the cooling system and outboard from the seawater outlet 23.

When the engine rotation sensor 53 detects the engine rotation speed lower than the set value and the temperature sensor 44 detects the temperature of the cooling fresh water lower than the set value, the controller 54 starts the first operation.
And the second switching valves 31 and 32 are switched to circulate seawater through the bypass pipe 27.

Next, an embodiment of the present invention will be described in detail with reference to the drawings.

As shown in FIGS. 1 and 2, a strainer 12 is provided at a seawater inlet 11 of a power boat, and a suction port 13a of a seawater pump 13 is connected to the strainer 12 via a pipe 14. In the middle of 14, seawater intake valve 16 and seawater filter 17
Is connected. The heat exchanger 1 is installed at the discharge port 13b of the seawater pump 13.
8 seawater inlets 18a are connected via a pipe 19, and in the middle of the pipe 19, an intercooler 21 and a marine gear / oil cooler
22 is connected. At the seawater outlet 18b of the heat exchanger 18, a jacket 24a of an exhaust pipe 24 provided at the seawater outlet 23 is provided with a pipe 2
Connected via 6.

A bypass line 27 branches off from a line 26 between the heat exchanger 18 and the jacket 24a to form a seawater filter 17 and a seawater pump 13.
Is connected to the conduit 14 between the two. A first switching valve 31 is provided at one end of the bypass pipe 27, and a second switching valve 32 is provided at the other end. The first and second switching valves 31, 32 are three-port, two-position switching type solenoid valves. The first switching valve 31 communicates between the bypass pipe line 27 and the seawater pump 13 in an on state, and communicates between the seawater filter 17 and the seawater pump 13 in an off state. The second switching valve 32 communicates between the heat exchanger 18 and the bypass pipe line 27 in an on state, and communicates between the heat exchanger 18 and the jacket 24a in an off state. A pressure sensor is provided in the line 14 between the seawater filter 17 and the first switching valve 31.
28 is connected. The pressure sensor 28 uses an elastic body of a Bourdon tube as a pressure detecting element, and converts a displacement of the element caused by a change in pressure into an electric signal.

The heat exchanger 18 is provided with a fresh water passage 18c through which fresh water for cooling flows. A plurality of seawater passages 18d are arranged between the freshwater passages 18c. Seawater passages at both ends of the seawater passage 18d
Chambers 18e and 18f communicating with 18d are provided. Further, an exhaust manifold 33 is provided in the heat exchanger 18, and the manifold 33 is connected to the exhaust pipe 24 via a turbine chamber 34c of a water-cooled turbocharger 34. The intake air of the marine engine 37 is taken in from an intake intake 36 and is piped to an intake manifold (not shown) via a turbocharger 34 and an intercooler 21.

The engine 37 has a cylinder block 38 and a cylinder head 39
Having. The cylinder block 38 and the cylinder head 39 are provided with fresh water passages 38a and 39a through which fresh water for cooling flows, respectively. Fresh water is supplied to these passages 38a and 39a from a water pump 41 via a conduit.
One end of a conduit 43 is connected to the outlet of the cylinder head 39,
In the middle of the conduit 43, a temperature sensor 44 and a thermostat 46 are provided.
Is provided. 47 is a thermostat 46 and a water pump
It is a conduit connecting 41. The other end of the conduit 43 is the heat exchanger 18
The fresh water outlet 18h of the heat exchanger 18 and the water pump 41 are connected to each other by a conduit 48.
When the temperature of the fresh water rises above 76.5 ° C, the thermostat 46
When activated, fresh water in the engine 37 is circulated through the conduits 47 and 42.

The fresh water passage 38a of the cylinder block 38 has two outlets 38b and 38c.
One end of the conduit 51 to which the oil cooler 49 is connected is connected,
The other end of the conduit 51 is connected to the conduit 43. The other exit 38
In c, the turbine housing 3 of the turbocharger 34
One end of a conduit 52 to which a jacket 34b provided on 4a is connected is connected, and the other end of the conduit 52 is connected to a conduit 51. An engine rotation sensor 53 (FIG. 2) is provided on a crankshaft (not shown) of the engine 37.

The detection outputs of the pressure sensor 28, the temperature sensor 44, and the rotation sensor 53 are connected to the control input of the controller 54, and the control output of the controller 54 is connected to the first and second switching valves 31, 32 via the drive circuit 56. . Set values of the pressure sensor 28, the temperature sensor 44, and the rotation sensor 53 are stored in the memory of the controller 54. As the set value of the pressure sensor 28, a pressure in a predetermined range including the pressure in the pipeline 14 when the hull jumps is stored, and a change in pressure that instantaneously passes through this pressure range is ignored. The set value of the temperature sensor 44 stores the minimum fresh water temperature necessary for normal operation, in this example, the temperature 76.5 ° C., and the set value of the rotation sensor 53 stores the engine rotation speed during warm-up operation.

The operation of the marine engine cooling seawater flow control device having such a configuration will be described.

When the hull of the power boat jumps into the air, the pressure sensor 28 detects an atmospheric pressure higher than the negative pressure at the time of sucking seawater by the seawater pump 13, that is, detects that the pressure of the pipeline 14 has entered the set pressure range. . The controller 54 communicates the first switching valve 31 between the bypass line 27 and the seawater pump 13 and communicates the second switching valve 32 between the heat exchanger 18 and the bypass line 27 based on the detected output. Switch as follows.
Seawater circulates through the cooling system via the bypass line 27. As a result, the seawater pump 13 does not suck air and does not run idle, so that there is no damage.

When the hull jumps into the air, the pressure sensor 28
Detects pressure higher than the set pressure range. controller
54 is a first and second switching valve 31, 32 based on this detection output.
And the bypass line 27 is closed. Accordingly, the seawater pump 13 takes in the seawater from the seawater inlet 11 and discharges the seawater from the seawater outlet 23 through the cooling system. At this time, the pressure in the line 14 rapidly changes from a pressure higher than the set pressure range to a pressure lower than the set pressure range. However, since the controller 54 ignores the pressure, the switching valves 31 and 32 are not switched.

During the warm-up operation, the engine rotation sensor 53 detects an engine rotation speed lower than the set value, and the temperature sensor 44 detects the engine rotation speed.
Detects the temperature of fresh water for cooling below 76.5 ° C. The controller 54 switches the switching valves 31 and 32 based on these detection outputs, and the seawater circulates through the bypass line 27 in the closed cooling system. As a result, the circulating seawater is gradually warmed, and the intake air cooling in the intercooler 21 and the fresh water cooling in the heat exchanger 18 are not performed, so that the warm-up time can be reduced and the compression temperature of the engine 37 during the warm-up can be reduced. It can ascend and prevent white smoke.

When the temperature of the cooling water for cooling the engine 37 rises and exceeds 76.5 ° C., and the normal load operation state is established, the thermostat 46 operates, and at the same time, the controller 54 switches the switching valves 31 and 32, and the bypass line 27 is closed. You. Therefore, seawater pump
13 takes in seawater from a seawater inlet 11 and discharges it out of the ship from a seawater outlet 23 through a cooling system. As a result, the seawater flows through the intercooler 21, the marine gear / oil cooler 22, the heat exchanger 18, and the jacket 24a of the exhaust pipe 24 by the seawater pump 13, and the temperature of the intake air drops in the intercooler 21, and the engine
The output of 37 will increase.

In the embodiment, an engine having an auxiliary device such as an intercooler or a water-cooled turbocharger is described. However, this is an example, and an engine without an auxiliary device such as an intercooler or a water-cooled turbocharger may be used.

Further, in the embodiment, the controller is set so as to switch the switching valve when the fresh water temperature becomes 76.5 ° C., but this set temperature is an example, and may be set to another temperature.

[Effects of the Invention] As described above, according to the present invention, the controller controls the first and second switching valves based on the detection output of the pressure sensor, so that idling of the seawater pump can be prevented. Further, since the controller controls the first and second switching valves based on the detection outputs of both the engine rotation sensor and the temperature sensor, the warm-up time during the warm-up operation can be reduced. As a result, white smoke during warm-up operation can be reduced.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a seawater flow control device for cooling a marine engine according to an embodiment of the present invention. FIG. 2 is the electric circuit diagram. 11: seawater intake, 13: seawater pump, 14, 19, 26: pipeline, 18: heat exchanger, 23: seawater outlet, 27: bypass pipeline, 28: pressure sensor, 31: first switching valve, 32: second switching valve, 37: marine engine, 44: temperature sensor, 53: engine rotation sensor, 54: controller.

Claims (1)

(57) [Scope of request for utility model registration] 1. A pipeline (14, 19) connecting between a seawater inlet (11) and a cooling system of an engine (37), and the pipeline (14).
A seawater pump (13) which is provided in the seawater pump (13) for feeding seawater taken in from the seawater inlet (11) to the cooling system of the engine (37) through the pipeline (14, 19);
A heat exchanger (18) for cooling the fresh water for cooling and exhaust gas by heat exchange with the seawater to cool the seawater, and a seawater outlet for discharging the seawater from the heat exchanger (18) through a pipe (26). (23), a pipe (1) having one end connected to the pipe (26) and the other end positioned between the seawater intake (11) and the seawater pump (13).
4) a bypass pipe (27) connected to the seawater inlet (11) and the seawater discharge port (23), and the pipe (14) at the other end of the bypass pipe (27). A first switch which is provided at a connection portion for connecting to the bypass pipe (27) and the seawater pump (13) or which can be switched to communicate the seawater inlet (11) and the seawater pump (13). A valve (31) is provided at a connection portion of one end of the bypass pipe (27) to the pipe (26) to communicate the heat exchanger (18) and the bypass pipe (27) or A second switching valve (32) that can be switched so as to communicate the exchanger (18) and the seawater discharge port (23); and the seawater intake (11) and the first switching of the pipeline (14). A pressure sensor (28) provided in a pipe (14) located between the valves (31) and detecting the pressure of seawater in the pipe (14);
An engine rotation sensor (53) for detecting a rotation speed of the engine (37); a temperature sensor (44) for detecting a temperature of fresh water for cooling the engine (37); and a detection of the pressure sensor (28). A controller (5) that controls the switching valves (31, 32) based on the output or the detection output of both the rotation sensor (53) and the temperature sensor (44).
4) A seawater flow control device for cooling a marine engine, comprising: and