JPS5862351A - Fuel heater for engine - Google Patents

Abstract

PURPOSE:To prevent the deposition of a paraffin in a fuel while to dissolve the paraffin deposited in a filter thus to achieve the normal fuel passage, by providing a heater unit for heating the fuel in a fuel filter in said fuel filter. CONSTITUTION:A fuel filter 4 is comprised of a filter body 10 and a head cover 11. A heater unit 30 is comprised of a heat transmission board 31 formed along the outercircumference of the upper end section of the filter body 10, a heater body 32 burried in the circumference of said board 31 and a temperature sensor 33 burried in one side section of said board 31. The fuel will dissolve the paraffin deposited under the low temperature when passing through the through- hole 31a or heated by the heat transmitted from the surface of said board 31. Consequently the fuel passing through a element 14 will increase to normalize the fuel passing through a piping system 1 thus to normalize the operation of the engine.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides an engine fuel heating tctri system for heating fuel in a fuel filter disposed in a fuel piping system.
Regarding t.

Generally, the fuel for diesel engines is @fIA,
Relatively high viscosity fuel such as heavy oil is used. By the way, for these fuels, not only the cetane number, which evaluates the combustion characteristics, but also the pour point, cloud point, etc., which evaluate the fluidity of the cap material, are specified in J.E.S. Therefore, diesel fuel is differentiated depending on the usage environment (% outside air temperature).For example, when the outside air is -5C1, No. 2 diesel oil is used up to t-5oc, No. 8 diesel oil, etc. is used. It is intended to be used to operate the engine in a positive manner.

However, in recent years 6 has become the president's distance mileage.
The resistance of the piping system becomes high due to the early use of mixed fuels and the use of low resistance fuel piping systems due to the use of distribution type injection pumps. Therefore, there are some problems with diesel engines! l1% In particular, engine starting problems tend to occur frequently. It has become clear that the cause of engine sluggishness is that paraffin in the fuel precipitates due to the use of diesel fuel at low temperatures and clogs the fuel filter.

Therefore, as a countermeasure against this clogging, it is possible to dissolve the precipitated buff fins, but heating the fuel itself is the most effective way to dissolve this paraffin. It will leak out and solve the engine problem.

In view of the conventional situation, the present invention provides a fuel filter with a heater unit for heating the fuel in the fuel filter, thereby preventing the precipitation of paraffin in the fuel and dissolving the paraffin precipitated in the fuel filter. The present invention provides a fuel heating device designed to promote normal operation of an engine.

Embodiments of the present invention will be described below in detail based on the drawings. As shown in detail in FIG. 2 and FIG. The head cover 11 is attached to the upper end of the filter body 1O via a threaded portion A. The filter body lO
It has a double structure with an inner cylinder 12 and an outer cylinder 13, and a filter membrane 14 made of P paper, P cloth, etc. is placed between the inner and outer cylinders 12 and 13. On the other hand, a fuel inlet 15 and a fuel outlet t6 are formed in the helad cover 11, and the inlet IS is connected to the fuel supply pump 8 through a pipe 7t.
-, and the outlet port [6 is connected to the injection pump 5 via a pipe B. and,
The fuel introduced from the intake port t5 passes through passages 17 and 18.
1 through the filter element 14KJl, and after being filtered by this filter element 14, the passage 19 passes from the inner cylinder 12.
．． 20 and is discharged from the outlet 16.

Here, one aspect of the present invention is to sandwich and fix a heater unit (supply) for heating the fuel in the fuel filter 4 between the filter main body 1o and the herad cover 11 via the threaded portion A. It is. That is, the tahita unit 30 is
A heat exchanger plate 31 formed approximately along the outer circumferential shape of the upper end of the filter body 10, a heater body 32 embedded within the periphery of the heat exchanger plate 31, and a heater body 32 embedded in one side of the heat exchanger plate 31. NFCM degree sensor 33. The heater main body 32 is formed of an electric heating element such as nichrome wire,
As the heater main body 32 generates heat, the heat transfer plate 3
1 is heated as a whole. The temperature sensor 33 detects the temperature of the heat transfer plate 31, and an external control mechanism turns off and on the power supply to the heater main body 32,
This is to prevent overheating of the heat exchanger plate 31. 31
A is a round hole that communicates the passage 17 and the passage 18 and through which the fuel passes.

Due to the configuration above, when the heater body 32 is energized, the heater body 32 generates heat, and the heat exchanger plate 31 is heated. Then, when the fuel passes through the through holes 31a of the heat exchanger plate 31, or is heated by heat transfer from the surface of the heat exchanger plate 31,
It dissolves the nine paraffins precipitated in the nuclear fuel at low temperatures, and also dissolves the precipitated paraffins adhering to the filter element 14. Therefore, the amount of fuel passing through the filter 14e increases, and in other words, the fuel passing through the fuel piping system 1 is converted to normal operation of the diesel engine. Since the amount of heat generated by the heater unit (equipment) is controlled based on the detected value of the temperature sensor 33, the fuel will not be overheated too quickly.

By the way, the heater body 3 of the heater unit 3o mentioned above
Although the example using an electric heating element is shown as No. 2, it goes without saying that the invention is not limited to this, and other means that can generate heat may be used.

As explained above, the fuel heating device for an engine of the present invention has a round heater unit that heats the fuel in the fuel filter clamped and fixed between the filter body of the fuel filter and the head cover. Excellent effect of dissolving paraffin precipitated in fuel at low temperature and also dissolving precipitated paraffin adhering to the filter element, normalizing fuel passage through the fuel piping system and normalizing engine operation. has.

[Brief explanation of the drawing]

Fig. 1 is a rough schematic diagram of the fuel piping system of a diesel engine, Fig. 2 is an external view of the fuel filter of the fuel heating device K of the present invention, and Fig. Ruru. l...Fuel piping system 4...Fuel filter 10...Filter body 11...Herad cover 12I... ... Sea inner cylinder 13 ... - - Outer cylinder 14 ... φ-7 Ilter element 15 ...
...Fuel intake port [6...Fuel outlet SO...1--Heater unit 31--Heat exchange plate filter--1/Heater main unit--1 Temperature Senna Patent Idehara Hachi Higashi'g Roki Co., Ltd. Patent Attorney - Kensuke Iro Figure 1 Figure 2

Claims (1)

[Claims] (1) A fuel piping system for an engine in which a fuel filter is installed, which includes a filter body with a built-in filter element and a head cover that is attached to the filter body and has a fuel inlet and outlet. A fuel heating device for an engine, wherein a heater unit metal layer for heating the fuel in the fuel filter is fixed between the filter body and the heating cover.