JPS597725A - Cooling equipment of main marine engine - Google Patents

Abstract

PURPOSE:To eliminate the necessity for using a cooling seawater pump, by providing plural coolers to a marine gneine and utilizing a ship speed to cool cooling water, whose temperature is increased by a heat exchange in said cooler, through a central cooler bringing in seawater. CONSTITUTION:A lubricating oil cooler 8, piston cooling clear water cooler 9, fuel valve cooling clear water cooler 10 and a cylinder jacket clear water cooler 12 are connected to a main marine engine 13 respectively through pumps 3-6. Cooling water cooled by a central cooler 7 is supplied through a pump 2 to the lubricating oil cooler 8, piston cooling clear water cooler 9 and the fuel valve cooling clear water cooler 10. The central cooler 7 is protrusively provided below an outer shell of the ship bottom, and seawater is brought in by utilizing a ship speed, while at a trouble, selector valves 14b, 14c are opened and selector valves 14a, 14b are opened, then the seawater is directly introduced into a cooling system.

Description

[Detailed description of the invention] The present invention relates to cooling equipment for a main engine in a ship.

BACKGROUND ART Conventionally, a central cooling system as shown in FIG. 1 (system diagram) has been adopted for cooling equipment for main engines and auxiliary machinery of ships in order to facilitate maintenance and inspection thereof.

In FIG. 1, the amount of heat generated in the main engine 13 is taken out by pumps 3 to 6 for each cooling system and guided to each cooler 8 to 11, and the cooling water in each cooler 8 to 11 is It is designed to be moved to a central cooler 7 by a pump 2. Note that the reference numeral 12 indicates a cylinder jacket fresh water cooler.

In this way, a large amount of heat is concentrated in the seventh tral cooler 7, so the amount of seawater required to cool it becomes enormous, and the main cooling seawater pump 1 is required to have a large capacity. A large power source such as an electric motor for driving the main cooling seawater pump 1 is also required.

The present invention aims to solve these problems by making the above-mentioned central cooler 7 unnecessary for the pump 1, simplifying the structure, and even in the event that the above-mentioned central cooler breaks down. The purpose of the present invention is to provide a main engine cooling equipment for ships that allows the main engine to be operated safely.

For this reason, the marine main engine cooling equipment of the present invention is equipped with a plurality of coolers in the cooling system of the main engine in the ship, and
A cooling water circulation system that passes through these coolers and a pump that drives the cooling water in the same circulation system are provided, and the cooling water that is heated by heat exchange in the cooler and then discharged is cooled. A central cooler is provided in the circulation system, and the central cooler is provided with a flow path for cooling seawater that is taken in using the ship's speed, and the cooling water circulation system by the pump is connected to the central cooler. It is characterized by being equipped with a switching valve that can be shut off from the seawater and communicated with the seawater outside the ship.

Hereinafter, a marine main engine cooling system as an embodiment of the present invention will be explained with reference to the drawings. FIG. , a plurality of coolers 8-1
2 is provided.

That is, a lubricating oil cooler 8 for the main engine 13, a piston cooling fresh water cooler 9. Fuel valve cooling fresh water cooler 10. An air cooler 11 and a cylinder jacket fresh water cooler 12 are provided, and a cooling water circulation system passing through these coolers 8 to 12 is formed.

This circulation system is provided with a pump 2 for driving the cooling water, and a central cooler 7 for cooling the cooling water whose temperature has risen due to heat exchange in the coolers 8 to 12. It is being

In the cooling equipment of the present invention, in particular, the central cooler 7 is provided with a flow path for cooling seawater that is taken in using the speed of the ship. However, it is also possible to install this inside the ship and guide the cooling seawater taken into the ship by the scoop device to the flow path.

Further, in the cooling equipment of the present invention, a switching valve 14a as a shell valve that can cut off the cooling water circulation system using the dual pumps 2 from the central cooler 7 and connect it to seawater outside the ship;
1.4b, 14c, 14. d is provided,
As a result, even if the central cooler 7 breaks down,
2) It is designed to maintain its cooling function in an emergency manner by circulating cooling seawater through the circulation system.

Therefore, the pump 2 normally drives fresh water, but in an emergency it drives seawater, so it is designed for seawater.

The cylinder jacket fresh water pump 6 circulates fresh water to the cylinder jacket fresh water cooler 12 in the reservoir of the main engine 13, and the main cooling seawater pump 1 supplies cooling seawater to the cooler 12.

Pumps 3 to 5 are also attached to other coolers 8 to 10, respectively.

In the marine main engine cooling equipment of the present invention, as mentioned above, the central cooler 7 is changed from the conventional forced cooling type using a seawater pump to a type that utilizes ship speed. can be significantly reduced.

In addition, when the central cooler 7 fails, the cooling fresh water pump 2 is switched so that the cooling water circulation system by the pump 2 can be shut off from the central cooler 7 and communicated with the seawater outside the ship so that seawater from outside the ship can be sucked. Since the valves 14a to 14d are provided, the plant can have some margin against damage to the central cooler 7, and the safety of the operation of the main engine 13 can be increased.

Furthermore, since the cooling seawater is supplied to the central cooler 7 by utilizing the speed of the ship, a pump is not required, which has the advantage of simplifying the structure.

As described in detail below, according to the marine main engine cooling equipment of the present invention, the central cooler in the main engine cooling system eliminates the need for a pump, resulting in a simplified structure and energy saving effects. Even if an abnormality occurs in the central cooler, it can be disconnected and the main engine can continue operating without any interference, which can also contribute to improved safety.

[Brief explanation of drawings]

FIG. 1 is a system diagram showing a conventional marine main engine cooling equipment, and FIG. 2 is a system diagram showing a marine main engine cooling equipment as an embodiment of the present invention. 1. Main cooling sea water pump, 2. e cooling fresh water pump, 3.
・Lubricating oil pump, 4. Piston cooling fresh water pump, 5.
・Fuel valve cooling fresh water pump, 6.Nonda jacket cooling fresh water pump, 7. Central cooler, 8. Lubricating oil cooler, 9. Piston cooling fresh water cooler, 10. Fuel valve cooling fresh water cooler , 11...Air cooler, 12 cylinder jacket fresh water cooler, ]3φ・Main engine, 14a, 1
4b, 14c, 14d ++ *Switching valve. Sub-Agent Patent Attorney Yoshihiko Iinuma (Rikidai 1)

Claims (1)

[Claims] In the cooling system of the main engine on board, there are multiple coolers, a cooling water circulation system that passes through these coolers,
A central cooler is provided in the circulation system, the circulation system includes a pump for driving the cooling water, and a central cooler for cooling the cooling water that is heated by heat exchange in the cooler and then discharged, The central cooler is provided with a flow path for cooling seawater that is taken in using the ship's speed, and a switch that allows the cooling water circulation system by the pump to be cut off from the central cooler and communicated with seawater outside the ship. Marine main engine cooling equipment characterized by being equipped with a valve.