JPH04362220A - Cooling device for ship engine - Google Patents

Abstract

PURPOSE:To provide a cooling device equipped with a dust eliminating means capable of eliminating dust or the like choking a cooling water hose or the like forming a cooling water passage, easily. CONSTITUTION:An engine 30 disposed on a ship body 10, a cooling water intake port 42 for taking cooling water from the external of the ship body 10, a cooling water passage 40 for guiding cooling water from the cooling water intake port 42 to the engine 30, and a drain passage 34 for discharging cooling water to the external of the ship body 10 are provided. In this cooling device, a pump 52 for cleaning which takes water for cleaning from a cleaning water intake port 50 opening under a draft surface A, and supplies the water to the cooling water passage 40 on the downstream of the cooling water intake port 42 is provided.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cooling system for a marine engine, and more particularly to a cooling system for a marine engine equipped with a device for removing debris clogging the cooling system.

0002

2. Description of the Related Art Marine engines use seawater as cooling water to cool the engine. This cooling is performed by leading the cooling water from the cooling water intake port to the engine through a cooling water passage such as a cooling water hose, and exchanging heat with the engine's water jacket. The cooling water that underwent heat exchange is
It was being released outside the boat through the drainage passage.

0003

[Problems to be Solved by the Invention] By the way, when sailing in a sea area where a lot of algae, debris, etc. are floating, the debris may enter the cooling water passage through the cooling water intake port. The cross-section of the cooling water passage is usually not uniform, and there is a narrow part in some parts, and dirt and the like can enter this part, resulting in clogging and a shortage of cooling water. When such a phenomenon occurs, conventionally, the cooling water hose or the like forming the cooling water passage is removed and the clogged debris is removed. This work is a complicated work that requires disassembly, and is particularly difficult to perform at sea. For this reason, the work had to be carried out on land after calling at a marina.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a cooling device equipped with a dust removal device that can easily remove dust and the like.

[0005]

[Means for Solving the Problems] In order to achieve the above object, the present invention provides an engine disposed on a boat, a cooling water intake for taking in cooling water from outside the boat, and a cooling water intake for taking in cooling water from outside the boat. A cleaning water intake that opens below the draft surface of a marine engine cooling system includes a cooling water passage that guides cooling water from an intake port to the engine, and a drainage passage that discharges cooling water to the outside of the hull. The present invention is characterized in that a cleaning pump is provided that takes in cleaning water from an inlet and discharges the water to the cooling water passage downstream of the cooling water intake.

[0006]

[Operation] When the cooling water passage is clogged with debris, the present invention drives the cleaning pump, takes in water (cleaning water) from the cleaning water intake, and directs this taken-in cleaning water to the cooling water passage. The cooling water is discharged from the middle into the cooling water passage, and further, the cooling water passage is made to flow back toward the cooling water intake, and the dirt and the like that are clogged in the middle are discharged from the cooling water intake to the outside of the boat.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a sectional view showing a small jet propulsion boat equipped with a marine engine cooling system to which the present invention is applied. FIG. 2 is an explanatory diagram showing an enlarged view of a cooling device for a marine engine. FIG. 3 is a sectional view taken along the line III--III in FIG. 2. FIG. 4 is a side view showing a modification of the cleaning pump. FIG. 5 is a flowchart showing the work procedure at the time of overheating.

In FIG. 1, 10 is the hull, 12 is the bottom of the boat,
Reference numeral 14 indicates a water intake port opened at the center of the boat bottom 12, 16 a duct, 18 a steering nozzle, 20 an impeller, 21 a drive shaft, and 30 an engine, which is supported by the boat bottom 12 and drives the drive shaft 21. The duct 16 communicates with the water intake port 14 on the upstream side and with the steering nozzle 18 on the downstream side. An impeller 20 is arranged within the duct 16. Drive shaft 21
receives the rotational force of the engine 30 and drives the impeller 20 to rotate. The rotation of the impeller 20 generates a jet flow within the duct 16, which is ejected rearward from the steering nozzle 18 to obtain propulsive force. In FIG. 2, 45 is the bulkhead, and A is the draft surface.

Next, the route of cooling water for the engine 30 will be explained using FIGS. 1, 2, and 3. A cooling water intake port 42 opens toward the drive shaft 21 in the duct 16 downstream of the impeller 20, as shown in an enlarged view in FIG. 32 is a water jacket inlet, which is an inlet that communicates with water jackets provided in various parts within the engine 30. The cooling water intake port 42 and the water jacket inlet 32 communicate with each other through a cooling water passage 40 . The cooling water passage 40 is
Upstream of the bulkhead 45, the cooling water hose 44 is connected to the connector 49 attached to the bulkhead 45, and downstream of the bulkhead 45, the pipe 4
7 to the water jacket inlet 32 via a joint 48 and an on-off valve 46. The joint 48 joins the cooling water passage 40 and a cleaning water passage 54, which will be described later. The on-off valve 46 has a function of opening and closing the cooling water passage 40. Note that FIG. 2 shows a state in which the on-off valve 46 closes the cooling water passage 40. Further, the imaginary line in the figure shows a state in which the on-off valve 46 opens the cooling water passage 40. A pressure sensor 70 is provided in the cooling water passage 40 between the joint 48 and the on-off valve 46 to detect the water pressure in the passage.

The cooling water that has undergone heat exchange with the water jacket passes through the drainage passage 34 and is discharged out of the boat below the draft level. Note that a water lock (not shown) for preventing backflow is provided in the middle of the drainage passage 34.

As the impeller 20 rotates and a jet flow is generated within the duct 16, the pressure within the duct 16 downstream of the impeller 20 increases to approximately 2 to 3 atmospheres. In response to this increased pressure, the cooling water flows from the cooling water intake port 42 to the cooling water hose 44, the connector 49, the pipe 47, the joint 48, and the on-off valve 46.
The water is pumped to the water jacket inlet 32 of the engine 30 through the cooling water passage 40 . In addition, joint 4
8 also tries to flow into the cleaning water passage 54, which will be described later.
This is prevented by the action of a check valve 56, which will be described later. The pressure-fed cooling water is sent to the exhaust passage in the engine 30, the cylinder,
After passing through a water jacket such as a cylinder head and exchanging heat, it passes through a drainage passage 34 and is discharged to the outside of the boat. In addition, in this embodiment, since the pressure inside the duct 16 downstream of the impeller 20 was used, a pump was not specially provided to introduce and circulate the cooling water, but a separate pump was provided to introduce and circulate the cooling water. You can.

Next, the configuration of the dust removal device will be explained using FIG. 2. 50 is a cleaning water intake opening below the draft near the duct 16, 52 is a cleaning pump, and 54 is a cleaning water passage, which communicates the cleaning water intake 50 and the joint 48. The cleaning water intake port 50 is provided with a filter for filtering out dirt and the like. The cleaning water passage 54 is provided with a cleaning pump 52 and a check valve 56 in this order from upstream. The check valve 56 allows flow only from the cleaning pump 52 toward the joint 48 .

The mechanism by which dust and the like enter the cooling water passage 40 and block the cooling water passage 40 will be explained next. Hull 1
0, when navigating in sea areas with a lot of algae and garbage, water intake port 1
Although much of the dust is removed by the screen installed in step 4,
A part of the water enters the duct 16 through the water intake port 14. Since the cooling water intake port 42 opens into this duct 16,
This dust and the like enter the cooling water passage 40 along with the cooling water. Small dust and the like pass through the engine 30 and are discharged from the discharge passage 34. However, large particles and the like gradually accumulate in the cooling water passage 40 near the cooling water intake port 42 where the angle changes greatly and near the connector 49 where the cross section is slightly narrowed. As the amount of accumulated water increases, the cooling water passage 40
The pipe becomes constricted and eventually becomes blocked, making it impossible to introduce cooling water.

Next, the procedure for removing dust and the like accumulated in the cooling water passage 40 will be explained using the flowchart shown in FIG. As dirt and the like accumulate in the cooling water passage 40,
The pressure sensor 70 installed downstream detects a pressure drop (step 201), and when the control circuit 72 determines that the detection result (pressure = P) has reached a certain value (=α) or less ( Step 202), the control circuit 72 lights up the pressure warning light 74 in red, for example (Step 203). The operator sees this lighting and stops the engine 30 (step 204). Then, the operator manually operates the on-off valve 4.
6 is closed (state in FIG. 2) (step 205). Then, the cleaning pump SW53 is turned on (step 206).
). Then, the cleaning pump 52 is driven, and seawater from which dirt and the like has been filtered is introduced into the cleaning water passage 54 from the cleaning water intake port 50 opened below the draft surface, passing through the filter 58.
It passes through the check valve 56, reaches the joint 48, and enters the cooling water passage 40. Since the on-off valve 46 is closed, the cleaning water does not flow toward the engine 30, but flows backward through the cooling water passage 40. The pressure sensor 70 detects the pressure at that time (=P■)
is detected and the detection result is sent to the control circuit 72. Connector 4
9 or the vicinity of the cooling water intake 42, the backflow is initially blocked, but due to a sudden increase in pressure, the debris, etc. separates from the clogged area, and the cleaning water flows into the cooling water intake 42. It flows backwards and is finally ejected from outside the boat. The pressure in the cooling water passage 40 between them is detected by the pressure sensor 70, and the detection result (pressure = P■) is compared with the detection result (P■) in step 207 (step 20
9), if P■>P■, the light is turned on, for example, in blue (step 210). Note that if P■≦P■, the process returns to step 208. The operator should turn on the pressure warning light 74.
The cleaning pump SW 53 is turned off (step 211), and the cleaning pump 52 is stopped. Then, the operator opens the on-off valve 46 (step 212). With the above series of operations, the work of removing dust and the like from inside the cooling water passage 40 is completed. Thereafter, the engine is started (step 213), and the process returns to step 201.

In this embodiment, cleaning water is introduced from the cleaning water intake port 50 into the cleaning water passage 54 using an electric pump, and is caused to flow backward through the cooling water passage 40 to discharge and remove dirt and the like. did. Therefore, it is possible to easily clean the cooling water hose etc. without disassembling it or doing any heavy lifting.

FIG. 4 shows a manual cleaning pump 152 as a modification of the cleaning pump 52. As shown in FIG. This cleaning pump 152 is driven by the operator swinging a lever 152a. For this reason, it requires a little more force than an electric pump, but it is similar to the electric pump in that it can be easily cleaned without requiring disassembly.

In this embodiment, the upstream end of the cleaning water passage 54 is connected to the cooling water passage 40 downstream of the connector 49.
The present invention is not limited to this part, but the cooling water passage 40,
It is sufficient to connect it downstream of the smallest cross section where dirt and the like tend to clog.

In the embodiment, the so-called direct cooling method in which the cooling water directly cools the engine has been exemplified, but the present invention is not limited to the direct cooling method. It can be similarly applied to indirect cooling methods.

In the above embodiments, the case where seawater is used as the cooling water has been described, but it goes without saying that the invention can be similarly applied to the case where freshwater is used as the cooling water.

[0020]

[Effects] According to the present invention, by driving the cleaning pump, it is possible to easily remove dirt and the like accumulated in the cooling water passage. Therefore, work such as disassembly is not required, and work can be done easily, especially at sea.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing a small jet propulsion boat equipped with a marine engine cooling device to which the present invention is applied.

FIG. 2 is an explanatory diagram showing an enlarged view of a cooling device for a marine engine.

FIG. 3 is a sectional view taken along line III-III in FIG. 2;

FIG. 4 is a side view showing a modification of the cleaning pump.

FIG. 5 is a flowchart showing a work procedure during overheating.

[Explanation of symbols]

10...hull 14... Water intake 16...Duct 20... Impeller 30...Engine 34...Drainage passage 40... Cooling water passage 42... Cooling water intake 44... Cooling water hose 46...Opening/closing valve 48...Joint 49...Connector 50...Cleaning water intake 52...Cleaning pump 54...Cleaning water passage 56...Check valve 58...Filter 70...Pressure sensor 74...Pressure warning light

Claims (1)

[Claims] 1. An engine disposed on a boat, a cooling water intake that takes in cooling water from outside the boat, a cooling water passage that guides cooling water from the cooling water intake to the engine; In a marine engine cooling system equipped with a drainage passage for discharging cooling water to the outside of the hull, water for cleaning is taken in from a cleaning water intake opening below the draft surface, and water for cleaning is taken in from a drainage passage downstream of the cooling water intake. A cooling device for a marine engine, characterized in that a cleaning pump is provided for discharging the water into the cooling water passage.