JPS5851264A - Fuel oil pre-treating apparatus for diesel engine - Google Patents

Abstract

PURPOSE:To enable to strain fuel oil of various qualities in a disesel engine in which fuel oil is supplied to a fuel injection pump through strainers by means of a fuel supply pump, by arranging a plurality of strainers in series to each other so that they can be used selectively. CONSTITUTION:In use of a relatively low-quality fuel oil in a serivce tank 1 of an engine, a plurality of strainers 4-6 are communicated in series to each other by opening a valve 15 and three-way valves 9, 10, and fuel thus strained appropriately is supplied to a fuel injection pump 3 via a fuel pipe 18. Here, arrangement is such that the mesh of the strainers 4-6 is decreased gradually from the upstream side toward the downstream side. In case of using a medium- quality fuel oil, on the other hand, a valve 16 is opened and the three-way valve 10 is positioned to communicate with the strainers 5, 6, so that fuel oil is strained only by the strainers 5, 6. Further, in case of using a high-quality fuel, a valve 17 is opened, so that the fuel oil is strained only by the strainer 6.

Description

[Detailed description of the invention] The present invention relates to a diesel engine fuel oil pretreatment device.

Generally, in a diesel engine, after the fuel oil in the fuel tank is processed by a predetermined processing device, it is temporarily stored in the engine service tank, and the fuel oil in the engine service tank is passed through a supply pump to a strainer. However, in recent years,
The quality of fuel oil continues to deteriorate, resulting in higher specific gravity, higher viscosity, sludge,
It contains many impurities, including catalyst particles. Especially for ocean-going ships, the properties of the fuel oil loaded at each port vary widely, and inferior quality oil is gradually becoming more common.
Currently, inferior oil containing large amounts of impurities such as catalyst particles and sludge must be regularly used. Therefore, the strainer tends to become unusable in a relatively short period of time.

Therefore, the present invention provides a diesel engine fuel oil pretreatment device that solves these problems.

Hereinafter, one embodiment of the present invention will be described based on the drawings. (1
) is a fuel tank, a settling tank, and is an engine service tank that temporarily stores oil introduced through a fuel oil treatment device such as a puerifier or clarifier. (2) is a diesel engine, (3) is a fuel injection pump,
(4) (5) (6) are the first to third strainers, (7)
(8) is a communication pipe that connects each strainer (4), (5), and (6) in series, and (9) α1 is the six communication pipe (7) (
(8) Three-way valve on the communicating pipe, (B) connects the fuel oil in the engine service tank (1) to each strainer (4) (5) (6)
A supply pump (6) 04 (14) for supplying the fuel injection pump (3) via the supply pump α→ and each strainer (4) (6) (6), ( 1$
(if90 is the supply pipe opening/closing valve installed in the 6th supply pipe (2) (13α→), (1 is the fuel pipe connecting the third strainer (6) and the fuel injection pump (3), a's The handle is the communication pipe three-way valve <9) (11 and the fuel pipe (the fuel pipe that connects the mountain pass).

The filtration conditions of the strainers (4), (5), and (6), that is, the roughness of the mesh becomes smaller toward the downstream (for example, the first strainer (4) is 50μ, the second strainer (5) is 25μ, and the third The strainer (6) can also be 5μ) and can have the same coarseness.

The operation of the above configuration will be explained. First, the engine service tank (
1) Classify the collected fuel oil into high quality, medium quality, and low quality depending on the amount of sludge, impurities, and catalyst fragments. And in case of low quality fuel oil, open the valve (9) and open the three-way valve (9) (
10 in the direction of each strainer (4), (5), and (6),
All you have to do is operate the supply pump 0υ. Thereby, the fuel oil in the engine service tank (1) is fed into the first strainer (4) via the supply pipe (6), and most of the sludge, impurities and catalyst pieces are filtered out. Next, the fuel oil is
It is sent into a strainer (5) and filtered in the same way,
After further filtering with the third strainer (6), the fuel pipe (G)
The fuel is sent to the fuel injection pump (3) via the fuel injection pump (3). In the case of sludged medium fuel oil, open the valve [phase], communicate the three-way valve (If) in the direction of each strainer (5) (6), and connect the second and third strainer (5). It can be filtered as per (6). Furthermore, in the case of high quality fuel oil, the valve (b) may be opened and the fuel oil may be filtered through the third strainer (6). Note that the fuel oil is heated in order to improve its fluidity and to maintain a constant viscosity at the inlet of the diesel engine (2). However, in the case of high viscosity oil, if the heating temperature becomes high, paper will form. Therefore, it is necessary to increase the supply power, and the fuel oil in the service tank (1) is supplied to the fuel injection pump (3) by the supply pump αη at a discharge pressure of 6 to 1°K.

In the above example, there are three strainers (4) (5) (6)
However, it is not limited to this. When using relatively high quality fuel oil, two may be used, and when using low quality fuel oil, four may be used as necessary. The above may be used.

In addition, when using strainers (4), (5), and (6) in parallel, make the coarseness of each strainer the same, open the supply pipe on-off valve θI, and open the three-way valve (9). (10 can be connected in the direction of the strainer (4) and the fuel pipe (in) and the strainer (5) and the fuel pipe (e), respectively, and even low quality oil with a lot of sludge and impurities can be processed in parallel and a large throughput can be achieved. can get.

As described above, according to the diesel engine fuel oil pretreatment device of the present invention, a plurality of strainers are provided, and a communication pipe is provided that connects the valley strainers in series or in parallel. A supply pipe is provided to connect each fuel oil to the supply pump, and a fuel pipe is provided to connect the strainer on the downstream side to the fuel injection pump, so the fuel oil can be filtered appropriately depending on the quality of the fuel oil, from low to high quality. It is something that can be done. In addition, since the upstream strainer can be coarsely woven and the downstream strainer can be finely woven, each strainer can be used for a longer period of time. It can be used continuously if used.

[Brief explanation of drawings]

The figure is a process diagram showing one embodiment of the present invention. (1)--[1 Service tank, (2)--Diesel engine, (3)--Fuel injection pump, (4) (5)
(6)--Strainer, (7) (8)...Communication pipe, (9
) QO...Communication pipe three-way valve, 0")...Supply pump, @ (to) α→... Supply pipe, 0→OQaη... Supply pipe opening/closing valve, (tie 0 [phase] )... Fuel pipe agent Yoshihiro Morimoto

Claims (1)

[Claims] 1. In a diesel engine fuel oil pretreatment device in which fuel oil in an engine service tank is supplied to a fuel injection pump of a diesel engine via a strainer by a supply pump, a plurality of the strainers described above are arranged, A communication pipe that communicates each strainer in series is provided, a communication pipe three-way valve is provided on the communication pipe, a supply pipe is provided that connects each strainer and a supply pump, and each supply pipe is provided with a supply pipe for opening and closing. A diesel mechanized fuel oil pretreatment device characterized by being provided with a valve, a closing fuel pipe connecting a downstream strainer and a fuel injection pump, and a fuel pipe connecting a three-way communication pipe valve and an injection pump.