JPH0326886Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a fuel filter device for a diesel engine.

[Conventional technology]

Diesel engine fuel has a higher water content than gasoline, and a water separation type fuel filter device is used to prevent rusting of fuel system equipment due to the water. Since it is necessary to discharge the water separated within the device, the device is equipped with a level sensor.

Conventionally, in a filter, a sensor is made separately and attached to the filter case.The method of connection is shown in Fig. 2, in which a nut 2 is fixed to the bottom of the case 1 by a method such as welding, and the sensor is attached to the nut 2. This method uses an O-ring 8 as a sealing material during the connection.

[Problem that the invention attempts to solve]

The sensor housing 9 is molded with resin and the nut 2 is
If it is tightened to a certain degree, there is a possibility of creep damage due to the stress during tightening, a sealing material is required when joining, and there is a possibility of troubles such as fuel leakage due to lack of sealing material. There are problems in terms of quality, and there are also problems such as being disadvantageous in terms of cost in terms of ease of assembly, number of parts, and processing accuracy of the sealing surface.

Furthermore, when there is no water in case 1, float 3
There was also a problem in that the float 3 did not move smoothly when the float 3 came into close contact with the bottom of the case 1, creating surface tension of the liquid between the two, and water accumulated inside the case. .

[Means for solving problems]

In this invention, by integrally molding the sensor housing, the filter case, and the protrusion that comes into contact with the float on the bottom of the case, the problem occurs when the sensor housing and filter case are combined, and between the float and the case. This solves the problem.

〔Example〕

In FIG. 1, reference numeral 1 denotes a thin cylindrical filter case made of resin, and a fuel filter 2 for removing impurities in fuel is housed inside the filter case. Also,
A water reservoir 3 is formed on the bottom side. A cap 4 is attached to the upper part of the case 1 by a ring 5. Reference numerals 6 and 7 denote an inlet side pipe and an outlet side pipe, and fuel flows from inside the tank through a hose connected to the pipe 6 and passes through the fuel filter 2. Impurities are removed during this time, and water, because of its high specific gravity, settles and accumulates in the water reservoir 3.
The purified fuel passes through the water condensing filter 16 below the filter 2, passes through the anti-clogging filter 17 as shown by the arrow, and is supplied from the center A through the flow path in the cap to the engine from the outside pipe 7.

A guide 9 with a reed switch 8 incorporated therein protrudes from the bottom of the case 1, and a float 10 is fitted onto the outer periphery of the guide 9 so as to be slidable in the vertical direction. A stopper 11 is provided at the tip of the guide 9. Furthermore, a resistor 12 and a lead wire 1 are connected from the bottom of the case 1 to the outside.
A sensor housing 15 is provided in which a sensor housing 15 has a water reservoir 3 incorporated therein and fixed with a resin material, and a drain socket 14 for opening and closing a hole communicating from the water reservoir 3 to the outside is attached to the housing 15. Drainage is done by loosening this.
In addition, a plurality of protrusions 10a are formed on the bottom of the case 1 at positions facing the float 10.
This prevents the float 10 from coming into close contact with the bottom of the case 1 due to surface tension.

Here, the case 1, guide 9, protrusion 10a, and sensor housing 15 are all made of resin and integrally molded.

In FIG. 1, a reed switch 8 is incorporated into a cylindrical guide 9 protruding from the bottom of the case. As water accumulates, a ring-shaped float 10 fitted around the outer periphery floats up, and when it reaches a certain level, a reed switch 8 is activated to notify the need for drainage via a lead wire 13. Further, a drain hole 18 communicating with the outside from the bottom of the case is provided, into which a drain socket 14 is screwed. When the drain tank 14 is tightened, the drain hole 18 is closed, and by loosening the drain hole 18, water can be drained.

[Effect of idea]

As described above, in the present invention, the guide incorporating the switch, the protrusion that prevents the float from coming into close contact with the bottom of the case, and the drainage means for draining water accumulated in the water reservoir are integrated into the bottom of the resin case. By forming it, it is extremely easy to form, and has the effect of improving ease of assembly, greatly reducing the number of parts, and eliminating the need to secure a sealing surface.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an embodiment of the device of the present invention;
FIG. 2 is a sectional view showing the main parts of a conventional cooling system. 1... Case, 2... Fuel filter, 3... Water reservoir, 8... Reed switch, 9... Guide, 1
0...Float, 10a...Protrusion, 15...Housing.

Claims (1)

[Scope of Utility Model Registration Claims] A case made of resin, a fuel filter housed in the case, a water reservoir formed on the bottom side inside the case, and a housing protruding into the water reservoir, the housing being a part of the case. a guide integrally formed with the case at the bottom and incorporating a switch therein; a float disposed around the outer periphery of the guide; and a guide integrally provided at the bottom of the case so that the float comes into close contact with the bottom. A fuel filter device comprising: a protrusion that prevents water leakage; and a drainage means that is integrally formed on the bottom of the case and drains water accumulated in the water reservoir.