JPS6040851Y2 - internal combustion engine fuel filter - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a fuel filter for an internal combustion engine, and more particularly to a fuel filter incorporating a fuel heating device.

Large diesel engines are equipped with a fuel heating device that uses steam or an electric heater as a heat source to heat low-quality oil and use it as fuel for the engine.

However, in small diesel engines, it is often impossible to provide such a separate heating device due to space and cost considerations.

Therefore, in the past, small diesel engines had the disadvantage that low-quality fuel could not be used.

The present invention aims to eliminate such conventional disadvantages and provide a fuel filter for an internal combustion engine that can be effectively applied to small diesel engines. A filter element 5 is arranged in the filter space with the inside as a filter space, and a cylindrical casing 10 is arranged outside the inner cylinder 11 to form an annular heat exchange space between the two, In this heat exchange space, a plurality of heat exchanger tubes 6 through which engine lubricating oil or cooling water flows are arranged so as to extend in the vertical direction,
A fuel inlet 14 is opened in the casing 10 near the top of the heat exchange space, and a plurality of small holes 15 are bored in the inner cylinder 11 near the bottom to connect the heat exchange space and the filter space. The fuel filter for an internal combustion engine is configured to allow fuel oil to flow into the filter space through the heat exchange space and the small holes 15, and according to the present invention, it is a small-sized fuel filter that does not have a special heat source. In a diesel engine, it is possible to use low-quality oil as engine fuel, reduce the degree of clogging of the fuel filter, and increase the service life of the fuel filter.

Next, embodiments of the present invention will be described with reference to the drawings.

A casing 10 is a cylindrical body with a bottom, and a space for heat exchange is formed between the casing 10 and an inner cylindrical body 11 provided inside the casing.

In other words, this space contains engine lubricating oil or cooling water (
A large number of heat transfer tubes 6 through which a high-temperature fluid (hereinafter referred to as "high temperature fluid") flows are arranged, and fuel is introduced into the space from an inlet 14 as shown by arrow A.

Note that the heat transfer tube 6 provided in the space is connected with an inflow pipe 3 and a discharge pipe 4 for high-temperature fluid, and fuel flows into the inner cylinder 11 through a large number of small holes 15 bored in the inner cylinder 11. It flows out into the filter space 20 formed inwardly.

A filter element 5 is supported by a spring 9 and an O-ring 16 and is disposed in a sealed filter space formed at the center of the inner cylinder 11 .

12 is an upper casing fixed above the casing 10 by a flange 13 and having a high-temperature fluid passage 17 therein; a block 21 supported by a flange 18 is provided inside the casing 12 (the passage 17 is connected to the upper casing 12); and the block 21), and the filter element 5 is attached to the O-ring 16 on the lower surface of the block 21.
is held in place by a spring 9.

2 is a fuel outlet formed in the core material 1 of the filter element, 19 is a bottom plate of the casing 10, and 8 is a baffle plate provided at an appropriate position between each heat exchanger tube, and extends from above to below into the heat exchange space. It is provided to turn the rapidly flowing fuel oil into a spiral flow as shown by the arrow in the drawing.

While the engine is operating, the lubricating oil or cooling water of the engine is kept at 90°C.
The fluid is at a high temperature of ~120° C. and is introduced from the inlet pipe 3 into the heat transfer tube 6 inside the casing 10 .

On the other hand, low-quality fuel oil flows into the casing 10 from the inlet 14 as shown by arrow A, is heated to about 80°C in the heat exchange space inside the casing 10, and flows into the fuel filter element 5 through the small hole 15. .

Therefore, the viscosity of the fuel oil flowing into the filter element 5 and flowing out from the filter element 5 is reduced, and the atomization becomes good, so that even low-quality oil can be used as fuel for the engine. It also means that the degree of clogging of the filter element can be reduced.

The fuel filter for an internal combustion engine of the present invention is configured as described above, and the lubricating oil or cooling water of the engine flows in the annular heat exchange space between the cylindrical casing 10 and the inner cylinder 11. A plurality of heat exchanger tubes 6 are arranged so as to extend in the vertical direction, and a fuel inlet 14 is opened in the casing 1o near the upper part of the heat exchange space, and heat is injected into the inner cylindrical body 11 near the lower part. Since a plurality of small holes 15 are drilled to connect the replacement space and the filter space, the fuel inlet 1
The fuel oil flowing into the heat exchange space from 4 is efficiently heated by heat exchange with the high temperature fluid in the heat transfer tube 6 while flowing from the upper part of the space to the lower part and reaching the small hole 15. It can flow into the filter element 5 through the small holes 15 .

Moreover, in this case, since the space for heat exchange is formed around the fuel filter, the entire engine can be made compact, and the pipes etc. for connecting the heat exchanger and the fuel filter can be made compact. There is no need to provide one.

Furthermore, a plurality of heat exchanger tubes 6 are arranged within the heat exchange space, and at appropriate locations between the heat exchange tubes, fuel oil that rapidly flows from above to below flows spirally within the heat exchange space. Therefore, since the baffle plate 8 is provided, the fuel oil flows in a relatively thin layer and can exchange heat with the high-temperature fluid in the heat transfer tube 6, and the heating effect of the fuel oil due to heat exchange with the high-temperature fluid is improved. can be further improved.

Therefore, the viscosity of the fuel oil flowing into the filter element 5 and flowing out from the filter element 5 is reduced, and the atomization becomes good, so that even low-quality oil can be used as fuel for the engine. Furthermore, the degree of clogging of the filter element 5 can also be reduced.

Further, in the present invention, since the heat exchange space is provided as an annular space surrounding the inner cylinder 11, the fuel filter is formed by integrally combining the inner filter space and the surrounding heat exchange space. can be made more compact.

Furthermore, in this invention, the fuel filter is formed integrally with the heating heat exchanger, which is advantageous in terms of space, and there is no need for piping to connect the heater and fuel filter, reducing installation costs. The practical effects of the present invention are remarkable.

[Brief explanation of drawings]

The figure is a side sectional view of a fuel filter according to the present invention. 1...Core material, 2...Fuel outlet, 3.
...Inflow pipe, 4...Discharge pipe, 5...
... Filter element, 6 ... Heat exchanger tube, 10
...Casing, 11...Inner cylinder body,
12... Upper casing, 14... Inlet, 15... Small hole, 16... O-ring, 20... Filter space.

Claims (1)

[Scope of utility model registration request] The inside of the inner cylindrical body 11 is used as a filter space, and the filter element 5 is disposed within the filter space, and the inner cylindrical body 1
A cylindrical casing 10 is placed outside of the casing 1 to form an annular heat exchange space between the two, and within this heat exchange space there are multiple transmission channels through which lubricating oil or cooling water of the engine flows. The heat tubes 6 are arranged so as to extend in the vertical direction, and a baffle plate is provided at an appropriate location between each heat transfer tube to allow the fuel oil to flow from the top to the bottom in the space in a spiral manner. 8, a fuel inlet 14 is opened in the casing 10 near the top of the heat exchange space, and a plurality of small holes 15 are provided in the inner cylindrical body 11 near the bottom to communicate the heat exchange space with the filter space. A fuel filter for an internal combustion engine in which fuel oil is allowed to flow through the heat exchange space and the small hole 15 into the filter space.