JPS6012568Y2 - fuel filter - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a fuel filter that is inserted into the fuel supply system of an internal combustion engine such as a diesel engine, and is particularly adapted to heat the fuel within the filter.

In internal combustion engines such as automobiles, such as diesel engines, the main cause of engine malfunctions is that paraffin in the fuel is precipitated due to use of diesel fuel at low temperatures, clogging the fuel filter.

This fact has been revealed by recent research.

Therefore, as a countermeasure against the above-mentioned clogging, it has been considered to dissolve the precipitated paraffin.

Heating the fuel itself is effective in dissolving this precipitated paraffin, and heating the paraffin that has clogged the filter will also flow out, making it possible to eliminate engine malfunctions.

The basic purpose of this invention is to add a fuel heating means to the fuel filter to prevent the precipitation of paraffin in the fuel and to dissolve the paraffin once deposited on the filter element, thereby ensuring normal engine operation. The object of the present invention is to provide a fuel filter that promotes the following.

Another more specific purpose of this invention is to use a heater unit with an electric heater as a means of heating the fuel, and by devising a structural connection with the filter body, almost no improvements can be made to conventional fuel filters. To provide a fuel filter which can be combined with a heater unit without adding any additional material, is compact as a whole, and does not impair the workability of replacing a filter element.

In order to achieve the above object, this invention incorporates a head cover in which a fuel intake port, a fuel extraction port, and a priming pump are integrated into the cover body, and a filter element built into the head cover. A fuel filter comprising a removably attached filter cartridge, a tubular member having a fuel outflow opening that matches the intake port of the rad cover and a fuel inflow opening that communicates with the intake port; a fixture that is removably fixed to the heating pad cover with the opening communicating with the intake port; and a rod-shaped electric heater that is inserted into the fuel passage of the tubular member so as not to block the passage. , a heater unit comprising a temperature sensor attached to the tubular member is provided.

Hereinafter, one embodiment of this invention will be described in detail based on the drawings.

FIG. 1 is a plan view of a fuel filter according to the present invention, FIG. 2 is a front view, and FIG. 3 is a sectional view.

This fuel filter is roughly composed of a helad cover 100 and a filter cartridge 200.

The head cover 100 includes a cover body 1 made of cast metal.
A fuel intake port 111, a fuel extraction port 112, a priming pump 113, and the like are integrally provided at the fuel intake port 10.

A hollow threaded portion 120 is formed protruding from the center of the lower surface of the cover main body 110, and a fuel inlet 121 communicating with the extraction port 112 is opened at the center of the hollow threaded portion 120.

Further, the hollow screw portion 120 on the lower surface of the cover main body 110
A fuel outlet 122 that communicates with the intake port 111 is opened in an annular manner around the periphery of the fuel outlet.

The filter cartridge 200 houses a filter element 220 in a cylindrical container 210 and a container 21.
A sedimentor section 230 is configured on the lower side of the 0.

The sedimenter section 230 has a built-in water sensor composed of a float 231, a reed switch 232, and the like.

Further, an upper plate 250 is fixed to the upper end opening of the container 210 via a coupling ring 240.

A fuel outlet 251 is opened in the center of the upper plate 250, and a female thread is formed on the inner periphery of this outlet 251.

By screwing the threaded outlet 251 of the upper plate 250 and the hollow threaded portion 120 of the herad cover 100, the filter cartridge 200 can be detachably attached to the herad cover 100.

Further, a plurality of fuel inlets 252 are opened in the vicinity of the outlet 251 of the upper plate 250.

When the filter cartridge 200 is attached to the cover 100 by the screw connection described above as shown in the figure, the inlet 121 of the hollow threaded portion 120 is connected to the outlet 25.
1, and the outlet 122 communicates with the inlet 252.

In addition to the above configuration, the fuel filter according to this invention has the following features:
A heater unit 300 is provided to heat the fuel flowing into the head cover 100.

The heater unit 300 is mainly composed of a tubular member 310 formed by a short horizontal pipe part 311 and a long vertical pipe part 312 formed into one body in a substantially L-shape.
It is attached to the intake port 111 of.

An opening at one end of the horizontal pipe section 311 becomes a fuel outflow opening 313 that matches the intake port 111 of the head cover 100, and an inflow pipe 314 attached to the middle part of the vertical pipe section 312.
forms the fuel inflow opening described above, and this inflow pipe 31
4 serves as a substantial fuel intake port.

A hollow bolt 320 is inserted from the other end of the horizontal tube section 311, and the tip of this bolt 320 is inserted into the horizontal tube section 311.
protrudes from the outflow opening 313 of the head cover 100 and is screwed into the female threaded portion of the intake port 111 of the head cover 100.

That is, this hollow bolt 320 is the above-mentioned fixing device, and thereby the tubular member 310 is detachably fixed to the helad cover 100.

The hollow bolt 320 does not completely block the inside of the horizontal pipe part 311, and a horizontal hole 321 is also formed that communicates the inside and outside of the hollow bolt 320, so that the horizontal pipe can be connected from the vertical pipe part 312 side as described later. The fuel flowing into the portion 311 side passes through the hollow bolt 320 and flows into the intake port 111 of the head cover 100.

Furthermore, a horizontal pipe portion 311 is provided on the base side of the hollow bolt 320.
A temperature sensor 340 for detecting the internal temperature is installed in an embedded manner.

A rod-shaped electric heater 350 inserted from the lower end side is disposed inside the vertical tube section 312 .

The base portion of the electric heater 350 has a larger diameter than the upper end portion, and a threaded portion 351 and a hexagonal flange portion 35 are provided at that portion.
2 is formed.

On the other hand, a female thread is formed on the inner periphery of the lower end opening of the vertical tube part 312, and by screwing the threaded part 351 of the electric heater 350 into the female thread part, the vertical tube part 312
An electric heater 350 is disposed in a predetermined arrangement state within the fuel passage.

The outer diameter of the electric heater 350 is smaller than the inner diameter of the vertical tube section 312. Fuel flowing into the vertical tube section 212 from the inflow tube 314 passes through a gap on the outer periphery of the electric heater 350 and flows toward the horizontal tube section 311 side.

Next, the operation of the fuel filter configured as described above will be explained.

Inflow pipe 314 of heater unit 300 and helad cover 1
Connect the fuel pipe to the extraction port 112 of 00, and connect the inflow pipe 3
Fuel is supplied from 14.

Then, the fuel flows through the inlet pipe 314 → the gap around the outer circumference of the electric heater 350 in the vertical pipe part 312 → the horizontal pipe part 311, the hollow port 320 → the intake port 11 of the head cover 100.
1→priming pump 113→outflow port 122→inflow port 252 of filter cartridge 200→filter element 220→sedimentor section 230→outflow port 251→inflow port 121 of head cover 100→takeout port 112.

At the same time, the lead wire of the electric heater 350 is connected to the output side of a temperature control circuit (not shown) that is controlled by the detection output of the temperature sensor 340, thereby energizing the electric heater 350 to generate electricity. heating so that the detected temperature becomes a predetermined value.

Then, as described above, the fuel flowing through the vertical pipe portion 312 and flowing into the filter cartridge 200 from the head cover 100 is heated by the electric heater 350, which prevents the precipitation of paraffin in the fuel and dissolves the paraffin deposited on the filter element 220. It has this effect.

As explained in detail above, according to the fuel filter of this invention, since the heater unit is provided to heat the fuel flowing into the filter element, paraffin precipitated in the fuel at low temperatures is dissolved and the paraffin is heated to the filter element. It also dissolves precipitated paraffin that has caused clogging and promotes normal operation of the engine.

Furthermore, since the heater unit is structurally attached to the intake port of the head cover, conventional head covers and filter cartridges can be used as they are in most cases.

Further, since the heater unit has a configuration in which a rod-shaped electric heater is inserted into the inside of the tubular member, it has a very compact form, and simply takes the form of a part of piping connected to the intake port of the head cover.

Therefore, the overall structure can be very compact.

To replace the filter cartridge, simply rotate it and remove the screw connection from the head cover, which is the same as before and is very easy.

[Brief explanation of the drawing]

FIG. 1 is a plan view of a fuel filter according to an embodiment of the invention, FIG. 2 is a front view, and FIG. 3 is a sectional view. 100...Head cover 110...
Cover body, 111...Intake port, 112.
...Ejection port, 113...Priming pump, 200...Filter cartridge,
220...filter element, 230...
... Sedimentor part, 300 ... Heater unit, 310 ... Tubular member, 32 o / bent / hollow bolt (fixing tool), 340 ... Temperature sensor, 35
0... Electric heater.

Claims (1)

[Scope of utility model registration request] A fuel filter comprising: a head cover in which a fuel intake port, a fuel output port, and a priming pump are integrated into a cover body; a built-in filter cartridge; and a filter cartridge that is detachably attached to the head cover. a tubular member having a fuel outflow opening that matches the intake port of the herad cover and a fuel inflow opening that communicates with the tubular member; Consisting of a fixture that is removably fixed to the heating pad cover, a rod-shaped electric heater inserted into the fuel passage of the tubular member so as not to block the passage, and a temperature sensor attached to the tubular member. A fuel filter characterized in that it has a heater unit.