JPS6024934Y2 - automotive fuel filter - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an automobile fuel filter that is installed between a fuel tank and a fuel pump and is used to remove foreign substances contained in fuel. This invention relates to an automobile fuel filter that also has the function of absorbing fuel.

Fuel is drawn into the fuel tank by a fuel pump through a fuel filter, sent to a float chamber of a carburetor, and further supplied from the carburetor to the engine side.

What is required in such an automobile fuel supply system is to stably maintain a sufficient supply amount commensurate with the amount of fuel consumed by the engine.

In other words, various structures and types of fuel pumps are known, ranging from reciprocating types using plungers and bullets to rotary types using vanes, etc., and there are also mechanical drive systems. There are many types available, including electric ones.

However, due to the structure of these pumps, the pressure on the discharge side fluctuates slightly, causing so-called pulsation.

When these pulsations become large, they act as an impact on the piping that is sent to the float chamber of the carburetor, which inevitably generates vibration noise, which is transmitted to the driver's seat and other areas as noise, which impairs comfort. This is not a desirable situation.

Pressure fluctuations on the pump discharge side due to such pulsations have a negative effect on the operation of the flute valve installed at the inlet of the float chamber of the carburetor, and can also cause fluctuations in the cut-off pressure of this float valve. This is not favorable for the supply system.

For this reason, conventionally, an accumulator with a buffer chamber using a diaphragm or other diaphragm has been integrated with a fuel pump.
Alternatively, it is known that the pump is provided separately in the middle of the piping on the discharge side of the pump, and its function absorbs the above-mentioned adverse pulsations.

However, installing the above-mentioned accumulator inside the fuel pump has disadvantages such as difficult design and construction, and high cost.In addition, installing it outside the fuel pump not only increases the number of parts but also requires special Mounting and fixing work is required, and extra mounting space is also required for this, which is not desirable, as it does not meet the recent demands for smaller and lighter automobiles.

The present invention was developed in view of these circumstances, and utilizes the housing of a fuel filter that is conventionally installed on the pump suction side of an automobile fuel supply system to remove foreign matter from the fuel, and the pump discharges into the filter chamber. A simple configuration in which pulsation absorption chambers connected to the side are integrally arranged in parallel, reliably absorbs the pulsation that occurs on the pump discharge side, thereby reducing noise caused by pulsation and reducing the amount of fuel flowing to the engine side. An object of the present invention is to provide an automobile fuel filter that can stably supply fuel.

Hereinafter, the present invention will be explained in detail using embodiments shown in the drawings.

FIG. 1 is a schematic system diagram showing a fuel supply system for an automobile employing a fuel filter according to the present invention, and FIG. 2 is a side sectional view showing a specific embodiment thereof.

First, in FIG. 1, the reference numeral 1 is an electromagnetic fuel pump that supplies fuel by reciprocating a plunger using, for example, an excitation force generated by an intermittent current. It plays a role of supplying the side carburetor float chamber 3.

In addition, in the figure, 4 is a pump suction side pipe arranged between the pump 1 and the tank 2, and 5 is the pump 1 and the vaporizer float chamber 3.
The pump discharge side pipes between the two are shown.

In such a configuration, a fuel filter 10 for removing foreign matter contained in the fuel sucked into the pump 1 is disposed in the middle of the bifurcated suction side pipe line 4 of the pump 1. However, the present invention utilizes the housing 11 of the filter 10, and a pulsation absorbing chamber 15 provided with a diaphragm 14 is arranged in parallel with the filter chamber 13 in which the filter element 12 is installed, and a pump is discharged into this pulsating absorbing chamber 15. The feature is that the side pipe 5 is connected.

To explain this in detail using FIG. 2, this fuel filter 1
0 is equipped with a synthetic resin housing 11 which is formed into a generally cylindrical shape as a whole and is divided into two upper and lower chambers by a partition wall 11a provided at the center in the axial direction, and the upper and lower openings are respectively Closed by metal lids 16 and 17,
The above-described filter chamber 13 and pulsation absorption chamber 15 are formed at the top and bottom.

The lids 16 and 17 are joined to the upper and lower openings of the housing 11 via gaskets 18 and 19, respectively, and are fixed in a liquid-tight manner by caulking their peripheries.

In addition, metal pipes 20 and 21 are fixed to the center portions of these lids 16 and 17 by brazing or the like, respectively.
In addition, on the sides of the housing 11, there are pipe portions 22. corresponding to the filter chamber 13 and the pulsation absorption chamber 15, respectively.
23 are integrally formed.

These pipes 20, 21 and pipe parts 22, 23 form connection ports that connect the pump suction side to the filter chamber 13 and the pump discharge side to the pulsation absorption chamber 15, respectively, and the fuel in the tank 2 is connected to the upper pipe. 20 into the filter chamber 13, filtered by the filter element 12, and then sucked into the pump 1 through the upper pipe 22.

The fuel discharged from the pump 1 is guided into the pulsation absorption chamber 15 from the lower pipe section 23 and further sent to the carburetor float chamber 3 side via the lower pipe 21.

In this case, in FIG. 2, T is tank 2, Carb,
indicates the vaporizer 70-to chamber 3, and Pin and Pout indicate the suction side and discharge side of the pump 1, respectively.

Furthermore, the filter element 12 provided in the filter chamber 13 described above has a substantially cylindrical filter portion 12a.
The upper opening is closed by being fixed to the back surface of the upper lid body 16 with a connecting agent, and the lower opening is closed by a closing member 12b which is also fixed with a connecting agent.

The fuel on the pump suction side is guided into the filter chamber 2a through the upper pipe 20, and further into the filter chamber 13 through the filter section 12a, and then through the upper pipe section 22 into the pump 1. is sent to the suction side of the

Further, the diaphragm 14 disposed in the pulsation absorption chamber 15 is held at its peripheral edge by an O-ring 24 fitted into an annular groove 11b on the outer peripheral side of the partition wall 11a and a flat washer 25, and the diaphragm 14 is snapped into place. The ring 26 separates the bulkhead 11
It is fixed on the a side.

An air chamber 27 is formed between the diaphragm 14 and the partition wall 11a, and this acts as a damper to absorb the pulsations occurring on the pump discharge side, and the discharge pressure of the pump 1 is averaged, so that the vaporizer float chamber 27 Supplied on the side.

The diaphragm 14 described above is preferably made of a comb material, a plastic film, or the like, and is made of an elastic and impermeable material.

According to such a configuration, when the pump 1 is driven, fuel is sucked in and discharged by reciprocating the plunger, which is a movable part of the pump, and when the pressure on the pump discharge side fluctuates, the diaphragm moves in synchronization with this fluctuation. 14 repeats expansion and contraction, and the pulsation is absorbed.

That is, when the pressure on the discharge side increases during pump discharge, the diaphragm 14 acts to contract the air chamber 27 to buffer and absorb the increased pressure, thereby equalizing the pressure on the discharge side.

By absorbing the pulsation in this manner, noise, which has been a problem in the past, is reduced, and furthermore, the problem of adversely affecting the operation of the float valve, which was the problem in the past, is eliminated.

Moreover, according to the above-mentioned configuration, the pulsation absorption chamber 15 connected to the pump discharge side and absorbing the pulsation is replaced with the housing 1 of the filter 10, which is conventionally provided on the pump suction side.
1 and installed in parallel in the filter chamber 13, it has a simple and inexpensive structure, which eliminates the complexity of the pump structure and the complexity of assembly work that conventionally occurred when installing the pump inside or outside the pump 1. Its practical advantages are great because it eliminates problems and requires only modification of conventional filters.

Further, according to the filter 10 having the above-described configuration, the fuel temperature increase caused by self-heating of the fuel pump 1 is cooled by the fuel temperature in the filter chamber 13 when passing through the pulsation absorption chamber 15, and as a result, This has the advantage of keeping the temperature on the pump discharge side low and preventing vapor lock as much as possible.

As explained above, according to the automobile fuel filter according to the present invention, the pulsation absorption chamber connected to the pump discharge side is provided in parallel to the filter chamber connected to the pump suction side, so that Although the configuration is simpler than when it is installed inside the fuel pump or separately on the pump discharge side, it reliably absorbs the pulsation that occurs on the pump discharge side, reduces noise generation, and is installed on the engine side. This makes it possible to provide a stable supply of fuel to the area, which has great practical effects.

[Brief explanation of the drawing]

FIG. 1 is a schematic configuration diagram showing a fuel supply system for an automobile employing a fuel filter according to the present invention, and FIG. 2 is a side sectional view showing a specific embodiment thereof. 1... Fuel pump, 2... Fuel tank, 3... Bent carburetor float chamber, 4... Pump suction side pipe, 5... Pump Discharge side pipe line, 10...
...Fuel filter, 11...Housing,
12...Filter element, 13...
・Filter chamber, 14...Diaphragm, 15.
...Pulsation absorption chamber.

Claims (1)

[Scope of utility model registration request] In an automobile fuel filter that is disposed between a fuel tank and a fuel pump and removes foreign substances contained in fuel on the pump suction side, a pulsation absorption chamber provided with a diaphragm forming a damper is connected to the pump suction side. 1. A fuel filter for an automobile, characterized in that the fuel filter is arranged in parallel with a filter chamber in which the pulsation is absorbed, and a pump discharge side is connected to the pulsation absorption chamber.