JPH11270425A - Fuel filter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lightweight fuel filter which requires a small space for installation. SOLUTION: A fuel filter 30 is configured so that a fuel having flowed in from the inlet way 43 is filtrated by a filter element 35 and discharged from the outlet way 60, wherein a diaphragm pump 31 is installed in the upper part of a body 34 having inlet 35 an the outlet 60, and the inlet hole 44 is equipped with a reed valve 48 in which one end of an arm 46 of the valve element to be opened and closed with the motion of a diaphragm 38 in the pump 31 is supported inside the body 34 and the valve element rises and falls while the outlet hole 50 is equipped with a flat plate valve in which the valve element rises and falls within the hole 50 with the aid of a spring.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fuel filter for an internal combustion engine of an automobile or the like, and more particularly to a fuel filter having improved fuel supply.

[0002]

2. Description of the Related Art As shown in FIGS. 5, 6, and 7, a diaphragm filter 2 is provided in a fuel filter 1 of an internal combustion engine of an automobile or the like. When the handle 3 is manually depressed when the fuel is manually fed from the fuel tank to the internal combustion engine, the diaphragm pump 2 moves downward, and then the diaphragm 4 moves upward by the repulsive force of the spring 5. Moving. An inlet hole 7 in the body 6 is provided with a reed valve 11 in which the valve body 8 moves up and down with the other end of the arm 9 having one end fixed to the valve body 8 as a support portion 10.
When the diaphragm 4 moves upward, its valve body 8
Is pushed up, and the entrance hole 7 is opened. On the other hand, the outlet hole 12 in the body 6 is provided with a reed valve 16 in which the valve body 13 moves up and down with the other end of the arm portion 14 having one end fixed to the valve body 13 as a support portion 15. When the diaphragm 4 moves upward, its valve body 8 is pushed up and closed.

At this time, when the diaphragm 4 moves upward, the reed valve 11 is opened through the opened inlet hole 7.
Fuel is supplied from a fuel tank (not shown) to a diaphragm chamber 17 between the diaphragm 4 and the inlet pipe 18 and the inlet passage 19.
And go through. Next, when the handle 3 is manually depressed, the valve element 8 of the reed valve 11 is depressed to close the inlet hole 7, and the valve element 13 of the reed valve 16 is depressed to open the outlet hole 12. The entered fuel flows out of the diaphragm chamber 16 toward the filter housing 20.

[0004] By repeatedly turning the handle 3 up and down,
The fuel enters the housing 17 through a through hole 23 formed at the center of a mounting cylinder 22 having a screw portion 21 on the outer periphery for mounting the housing 20, and the fuel enters the housing 17, is filtered by the element 24, and has an outlet passage 25 and an outlet pipe 26. Through the internal combustion engine (not shown). Reed valve 1 operating in this way
1 and 16 are mounted on a reed valve mounting plate 26, and the mounting plate 26 is mounted on a lower portion of the diaphragm chamber 16 provided in the body 6.

However, there are actually technical problems described below.

[0006]

That is, in the above-described conventional fuel filter, a valve mechanism for manually supplying fuel to the internal combustion engine is of a reed valve type, and the reed valve is mounted on a reed valve mounting plate. Since the mounting plate is mounted in the body, there is a problem that a large amount of space is required for the valve mechanism, the number of parts is large, and the weight increases.

The present invention solves the above-mentioned problems. A reed valve which opens and closes by the operation of a diaphragm in a body is directly attached to an inlet hole, and a flat plate valve is directly attached to an outlet hole.
An object of the present invention is to provide a fuel filter having a reduced mounting space and a reduced weight.

[0008]

In order to achieve the above object, the present invention relates to a fuel filter for filtering fuel flowing in from an inlet passage through a filter element and discharging the fuel from an outlet passage. A diaphragm pump provided at an upper part of a body having a reed valve that supports an arm portion of a valve body that opens and closes by the operation of a diaphragm provided in the diaphragm pump and moves the valve body up and down to an inlet in the body. The valve body is attached to an outlet hole in the body, and a flat valve whose valve body moves up and down in the outlet hole via a spring is attached to the outlet hole in the body.

According to the above construction, the reed valve is directly mounted on the inlet hole in the body, and the flat valve is directly mounted on the outlet hole, so that the fuel filter can be reduced in mounting space and weight.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below in detail with reference to the drawings. 1 is a sectional view of a fuel filter according to the present invention, FIG. 2 is a plan view of a valve section, FIG. 3 is a sectional view showing a closed state of an outlet valve of the valve section, and FIG. It is sectional drawing.

As shown in FIG. 1, the fuel filter 30 includes a diaphragm pump 31, a body 34 to which an inlet pipe 32 and an outlet pipe 33 are connected, and a housing 36 in which a filter element 35 is built. ing.

In the diaphragm pump 31, a diaphragm 38 provided in a case 37 is held by upper and lower diaphragm holding portions 39 and 40, and a handle 41 is mounted on an upper portion via a spring 42.

The body 34 has an inlet pipe 3
2 is connected, the flow path communicates from the inlet passage 43 to the inlet hole 44, and as shown in FIG. 2, the valve body 45 that closes the inlet hole 44 has one end of the arm portion 46 as a support portion 47. A reed valve 48 is directly attached to the body 34. A diaphragm chamber 49 is provided above the reed valve 48 and below the diaphragm 38, and an outlet hole 50 of the diaphragm chamber 49 is provided in parallel with the inlet hole 44.

As shown in FIGS. 2 and 3, a valve seat 52 having an arc-shaped slit 51 is provided in an outlet hole 50 of the body 34.
And a flat plate valve 5 comprising a valve element 55 which moves up and down in an outlet hole 50 via a spring 53 and has a passage port 54 in the center.
6 are provided directly. The body 34 has a threaded portion 57 for attaching the housing 36 on the outer periphery communicating with the outlet hole 50, and a through hole 58 at the center.
The mounting cylinder 59 having the housing 3
6 is screwed. The body 34 is provided with an outlet passage 60 connecting the outlet pipe 33 through which the fuel filtered by the element 35 passes.

A housing 36 has an element 35 in which a filter material 61 is formed in a spiral shape mounted therein. The housing 36 has a screw plate 62 whose upper surface is screwed to a mounting cylinder 59 and a closing plate 64 having a passage 63. It is closed and the space between itself and the body 34 is sealed by a packing 65. Housing 36
A float switch 66 for detecting that water has accumulated in the housing 36 and a discharge plug 6 for discharging water
7 are attached.

In the above configuration, when the handle 41 of the diaphragm pump 31 is manually pushed down, the spring 4
The diaphragm 38 rises by the repulsive force of 2, the valve body 45 above the inlet hole 44 rises, the inlet hole 44 opens, and the outlet hole 5
0 valve element 55 rises and the arcuate slit 51 of the valve seat 52
, Fuel flows from a fuel tank (not shown) through the inlet pipe 32 and the inlet passage 43 into the diaphragm chamber 49 through the inlet hole 44. Next, when the handle 41 is depressed, the valve body 45 above the inlet hole 44 is lowered to close the inlet hole 44, the valve body 55 of the outlet hole 50 is lowered, and the arc-shaped slit 51 of the valve seat 52 is opened, Fuel in the diaphragm chamber 49 is sent into the housing 36 through the passage hole 58 of the mounting cylinder 59 from the central passage port 54 of the valve body 55.

The fuel is filtered by the element 35 by repeatedly turning the handle 41 of the diaphragm pump 31 up and down, and supplied to the internal combustion engine from the outlet passage 60 through the outlet pipe 33. Since the inlet valve acting as described above is directly mounted on the body 34 as the reed valve 48 and the outlet valve as the flat plate valve 56, the valve mechanism can be downsized, the mounting space can be reduced, and the fuel filter can be reduced in weight. I was able to.

[0018]

According to the above construction, the reed valve is directly attached to the inlet hole in the body, and the flat valve is directly attached to the outlet hole. Therefore, the valve mechanism can be downsized, the space can be reduced, and the weight can be reduced. There is an effect that a reduced fuel filter can be obtained.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a fuel filter according to the present invention.

FIG. 2 is a plan view of a valve section of the fuel filter.

FIG. 3 is a sectional view showing the closing of an outlet valve of a valve section of the fuel filter.

FIG. 4 is a sectional view showing opening of an outlet valve of a valve section of the fuel filter.

FIG. 5 is a longitudinal sectional view showing a fuel filter according to a conventional example.

FIG. 6 is a cross-sectional view of FIG.

FIG. 7 is an enlarged sectional view showing a main part of FIG. 5;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 31 Diaphragm pump 34 Body 38 Diaphragm pump 43 Inlet passage 44 Inlet hole 45, 55 Valve body 46 Arm part 48 Reed valve 50 Outlet hole 56 Plate valve 60 Outlet passage

Claims (1)

[Claims] 1. A fuel filter for filtering fuel flowing from an inlet passage through a filter element and discharging the fuel from an outlet passage, comprising: a diaphragm pump provided on an upper portion of a body having the inlet passage and the outlet passage; A reed valve which supports an arm portion of a valve element which opens and closes by the operation of a diaphragm provided therein and which moves up and down is attached to an inlet hole in the body, and the valve element moves through an outlet hole through a spring. A fuel filter, wherein a flat valve that moves up and down is attached to an outlet hole in the body.