JPS6036325Y2 - fuel filter - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present application relates to a fuel filter with clogging and water puddle detection means.

Fuel filters are typically provided with means for separating moisture from the fuel, thereby causing the moisture to accumulate within the filter.

On the other hand, when the fuel filter becomes clogged to a certain level, a warning is given and the fuel filter is replaced with a new one.

Conventionally, there is no known filter of this kind that has a means for indicating that a predetermined amount of water should be discharged and a means for indicating clogging, which are not separate mechanisms but are integrated into one mechanism.

This is thought to be because the means for detecting both water puddles and clogging conditions, which have different detection characteristics, are separate mechanisms depending on their characteristics and cannot be simply integrated.

The present application provides a fuel filter equipped with a mechanism for detecting both of the above with a relatively simple configuration by using the same detection means.

To explain by way of example, the figure shows a fuel filter 1 of the present invention.
0, and the filter section 1, the detection section 2, and the instruction section 3 warn.

The filter section 1 includes a filter element 5 disposed within a cup-shaped casing 4, and a lid plate 8 having an inlet and an outlet 6, 7 provided at the upper end of the casing 4.

9 is a spring, and 11 is a backing.

The detection unit 2 is comprised of a movable body 13 provided in a cylindrical body 12, a float 14, and a resin body 17 in which reed switches 15 and 16 are embedded, and is disposed between the inner bottom of the casing 4 and the filter element 5.

The cylindrical body 12 has an end plate 20 having a through hole 18 in the side wall and an opening 19 at one end.

The movable body 13 has a float guide 21 at one end thereof, and a retainer 22 and an end plate 20 provided on the inner wall of the cylindrical body 12.
and is pressed toward the retainer 22 by a spring 23.

The float guide 21 is a cylindrical body and has a magnetic annular flange 24 at its end.

A resin body 17 having a main body 25 and a central protrusion 26 at the center thereof is inserted into the other end of the cylindrical body 12 of the detection unit 2. Reed switches 15 and 16 are embedded in each.

Further, the resin body 17 is provided with terminals A, B, C, and D, and conductive wires 27 for connecting the reed switches 15 and 16 are provided inside the resin body 17.
．． 28 are embedded respectively.

The reed switch 15 is normally open and is closed by magnetic lines of force.

Conversely, the reed switch 16 is normally open and is opened by magnetic lines of force.

A float 14 containing a magnetic material is disposed on the outer periphery of the float guide 21 between the retainer 22 and the resin body 17 inside the cylindrical body 12 .

The float 14 has a specific gravity between water and fuel oil.

The indicating section 3 is a circuit having a puddle indicating lamp 29 and a clogging indicating lamp 30, and the clogging indicating lamp 30 is connected to the terminal of the detecting section 2 and the power source E by conductive wires 31 and 32.

The puddle indicator lamp 29 is connected to the terminal B of the detection unit 2 and the power source E by conductive wires 33,34.

Terminals A and C are grounded. F and G in the circuit are lamp check switches.

Fuel enters from the inlet 6 of the fuel filter 10, flows through the filter element 5, flows out to the outlet lower part, and is trapped by dust or the like.

Moisture contained in the fuel is separated by the inertial separation action or the coagulation separation action of the filter element 5 and stored at the bottom of the casing 4.

When the amount of separated water is extremely small, the detection part 2 is filled with fuel, and the float 14 is deposited on the bottom, and the resin body 1 is deposited along with the magnetic annular flange 24 of the float guide 21.
Magnetic lines of force act on the reed switch 16 inserted in the reed switch 7.

On the other hand, the magnetic lines of force do not act on the reed switch 15 inserted into the central protrusion 26 of the resin body 17.

As a result, both reed switches 15 and 16 are open, and the puddle indicator lamp 29 and the clogging indicator lamp 30 do not light up.

When a large amount of water accumulates at the bottom of the casing 4, the magnetic float 14 floats up and applies magnetic lines of force to the reed switch 15 in the central protrusion 26 of the resin body 17, keeping the reed switch 16 open. .

As a result, the water puddle indicator lamp 29 is energized and lights up to indicate that a predetermined amount of water has accumulated.

Furthermore, in this state, when the filter element 5 reaches a predetermined level of clogging, the fluid pressure applied to the movable body 13 increases and
Raise it against 3.

Float guide 2 connected to movable body 13 as it rises
1 also rises in the same way, causing the lines of magnetic force acting on the reed switch 16 to disappear, thereby closing the reed switch 16.

Therefore, the clogging indicator lamp 30 is also energized and lights up to warn that the element 5 has reached a predetermined level of clogging.

When the amount of water in the casing 4 is small and the casing 4 becomes clogged, the movable body 13 rises and the clog indicator lamp 30 lights up in the same manner as described above.

At this time, the float 14 also rises, but the length of the retainer 22 of the cylindrical body 12 and the end plate 20 is determined so that the amount of rise of the movable body 13 is limited to a constant value.
4 to the reed switch 15 and the water puddle indicator lamp 16 is not fired.

As described above, the fuel filter of the present invention uses the same detection mechanism for the water puddle state and the clogging state, which have different detection characteristics, so it is possible to issue instructions and warnings for both with an extremely simple configuration. You can do it accurately.

[Brief explanation of the drawing]

The figure shows the fuel filter of the present invention. 1...Filter section, 2...Detection section, 3
...Instruction section.

Claims (1)

[Scope of utility model registration request] In a fuel filter comprising a filter element disposed within a cup-shaped casing, the inner wall of a cylindrical body has an end plate having a through hole on the side and an opening at one end between the bottom of the casing and the inside of the filter element. a retainer is provided, a movable body pressed by a spring is disposed between the retainer and the end plate, and a hollow float guide having a magnetic annular flange at the lower end is integrally formed on the lower surface of the movable body;
The other end of the cylindrical body is formed by a main body and a protrusion provided at the center of the main body, and a first reed switch that is closed by the action of magnetic lines of force is embedded in the protrusion, and the action of magnetic lines of force is embedded in the main body at the lower circumference of the protrusion. A resin body with a second reed switch embedded therein is inserted to close the float guide, and a detection part with a magnetic float having a specific gravity between that of ice and fuel oil is fixed around the outer circumference of the float guide. , a fuel filter provided with an indicating section consisting of a circuit formed by a water puddle indicating lamp connected to a first reed switch, a clogging indicating lamp connected to a second reed switch, and a power source.