KR102016342B1 - A filter structure provided in a fuel pump - Google Patents

Abstract

The present invention relates to a filter structure for a fuel pump. According to an embodiment of the present invention, the first filtration layer through which the fuel passes and the fuel passing through the first filtration layer passes through the intermediate filtration layer and the intermediate filtration layer combined with the first filtration layer. A second filtration layer through which the fuel is passed and combined with the intermediate filtration layer, and an inner filtration layer through which the fuel passed through the second filtration layer and combined with the second filtration layer, wherein the second filtration The layer comprises a smaller average pore diameter than the first filtration layer and the intermediate filtration layer includes a filter structure for a fuel pump provided with a larger average pore diameter than the first and second filtration layers.

Description

Filter structure provided in a fuel pump

The present invention relates to a filter structure for a fuel pump, and more particularly to a filter structure for a fuel pump with improved fuel filtration performance.

In general, the fuel tank of the vehicle is provided with a fuel pump to supply the stored fuel at a high pressure to enable the injector to supply fuel into the cylinder. The lower part of the fuel pump is provided with a fuel filter to filter the foreign matter mixed in the fuel to prevent foreign matter from being transported into the fuel pump, thereby preventing failure of the fuel pump by the foreign matter and extending the life of the fuel pump.

Such fuel filters for automotive fuel pumps generally consist of a single layer fabric or a multi-layered form in which the fabric surrounds the nonwoven fabric. Conventional fuel filters are made of polyamide (PA) based non-woven fibers and polyamide (PA) mesh woven fibers.

In recent years, polyester (PE) or a mixture thereof has been used as a material for fuel filters in place of polyamide (PA) based nonwovens and polyamide (PA) mesh fabrics.

However, polyamide (PA) materials have been widely used due to their high durability against gasoline and diesel fuel, but have been chemically applied to the characteristics of alcoholic clean fuels such as bioethanol and the moisture contained in fuels. It shows fragile properties. In particular, in the classification of alcohol-based fuel, not only ethanol but also recently added to the fuel methanol is used, so that when using a filter using a polyamide (PA) material, there is a disadvantage that becomes more chemically weak. Polyester (PE), which is used in place of polyamide (PA) nonwoven fabric and polyamide (PA) mesh fabric, is vulnerable to fuel resistance and alcohol resistance.

In addition, the filter of the polyamide (PA) mesh fabric having a conventional single layer structure is composed of a thin and dense single layer having a thickness of about 0.5 mm, so that the collection efficiency is high, but the impurities are not maintained because there is not enough space for collecting impurities. Low capacity, short life of the filter, high resistance has a problem that takes a large filter area.

In addition, the conventional polyamide (PA) nonwoven filter has a multi-layered multi-layer structure, and is designed to increase the efficient side and impurity retention capacity. Its manufacturing process is a polyamide (PA) short fiber used to form voids by stacking two or more layers of nonwoven webs composed of synthetic fibers only by needle punching or meltblown. (staple fiber) is manufactured only in the same volume specifications to form uniform pores, but since the pore size is almost uniformly distributed, there is a practical limit to shorten the life of the filter in the reality that the size of the impurities filtered.

Therefore, in the conventional fuel filter system consisting of a filter support layer and a nonwoven fabric of a polyamide (PA) -based fabric mesh structure, there is a problem in that the use of alcoholic fuel is less capable of removing impurities and the life of the filter is reduced.

The present invention is to provide a fuel filter for a fuel pump with improved fuel filtration performance to solve the above problems.

The present invention is not limited thereto, and other objects not mentioned will be clearly understood by those skilled in the art from the following description.

The present invention provides a filter structure provided in a fuel pump mounted on a vehicle.

According to an embodiment of the present invention, the filter structure for a fuel pump may include a first filtration layer through which fuel passes and an intermediate filtration layer through which the fuel passes through the first filtration layer and combined with the first filtration layer; And a second filtration layer through which the fuel passed through the intermediate filtration layer and combined with the intermediate filtration layer, and an inner filtration layer through which the fuel passed through the second filtration layer and combined with the second filtration layer. However, the second filtration layer may have a smaller average pore diameter than the first filtration layer, and the intermediate filtration layer may have a larger average pore size than the first filtration layer and the second filtration layer.

According to one embodiment, the inner filtration layer may be provided with a larger average pore diameter than the first filtration layer and the second filtration layer.

According to an embodiment, the first filtration layer may be formed of a plurality of layers, and the plurality of first filtration layers may be formed such that an average pore size gradually decreases toward the inner filtration layer.

According to an embodiment, the second filtration layer may be formed of a plurality of layers, and the plurality of second filtration layers may be formed such that the average pore diameter gradually decreases from the middle filtration layer toward the inner filtration layer. .

According to an embodiment, the first filtration layer and the second filtration layer may be a nonwoven fabric manufactured by a melt brown method, and the intermediate filtration layer and the inner filtration layer may be a nonwoven fabric manufactured by a spunbond method.

According to one embodiment, the outer side of the first filtration layer further includes an outer filtration layer coupled to the first filtration layer, the outer filtration layer may have a larger average pore diameter than the first filtration layer.

According to one embodiment, the outer filtration layer may be a nonwoven fabric manufactured by melt brown method, spunbond method or needle punching method.

According to one embodiment, a protective mesh layer may be formed on the outermost side of the fuel pump filter structure.

According to one embodiment, each of the layers of the filter structure for the fuel pump may be combined in a point fusion method.

According to one embodiment, the first filtration layer, the second filtration layer, the outer filtration layer, the middle filtration layer, the inner filtration layer and the protective mesh layer may comprise a polypropylene or polyamide material.

According to one embodiment of the present invention, it is possible to improve the filtration performance of fuel by providing a filtration layer having a large average pore size between the filtration layers provided to gradually reduce the average pore size.

The effects of the present invention are not limited to the above-described effects, and effects that are not mentioned will be clearly understood by those skilled in the art from the present specification and the accompanying drawings.

1 is a cross-sectional view showing a filter structure for a general fuel pump.
Figure 2 is a perspective view showing a filter structure for a fuel pump according to an embodiment of the present invention.
Figure 3 is a cross-sectional view showing a filter structure for a fuel pump according to an embodiment of the present invention.
4 to 6 are cross-sectional views showing a filter structure for a fuel pump according to another embodiment of the present invention.
7 is a view showing a comparative embodiment of the filter structure for a fuel pump of FIGS. 1 and 7.
FIG. 8 is a graph showing fuel filtration performance of a filter structure for a fuel pump according to a comparative example of FIG. 7.

Hereinafter, embodiments of the present invention will be described in more detail with reference to the accompanying drawings. The embodiments of the present invention can be modified in various forms, and the scope of the present invention should not be construed as being limited to the following embodiments. This embodiment is provided to more completely explain the present invention to those skilled in the art. Accordingly, the shape of elements in the drawings may be exaggerated for clarity. In addition, the terms or words used in the specification and claims should not be construed as being limited to the common or dictionary meanings, and the inventors properly define the concept of terms in order to best explain their invention in the best way. It should be interpreted as meaning and concept corresponding to the technical idea of the present invention based on the principle that it can.

The present invention relates to a fuel pump filter structure (10) capable of forming a fuel filter of a fuel pump. The fuel pump filter structure 10 may filter fuel supplied to an automobile engine.

1 is a cross-sectional view showing a filter structure for a general fuel pump. The filter structure 1 for a general fuel pump is provided with a protective layer 2 for protecting the nonwoven fabric on the outside. A plurality of filter layers 3, 4, 5, and 6 may be formed between the protective layers 2. The average pore diameter of the plurality of filtration layers 3, 4, 5, 6 may be provided such that the average pore diameter gradually decreases toward the fuel passing direction. For example, in FIG. 1, the average pore size may be reduced from the upper filtration layer 3 to the lower filtration layer 6. The plurality of filter layers 3, 4, 5, 6 may be provided as a nonwoven fabric manufactured by the melt brown method.

When comparing the fuel pump filter structure 1 of FIG. 1 described above with the fuel pump filter structure 10 of the present invention, the fuel pump filter structure 10 of the present invention has better fuel filtration performance. Hereinafter, the filter structure 10 for fuel pumps of this invention is demonstrated.

Figure 2 is a perspective view showing a filter structure for a fuel pump according to an embodiment of the present invention, Figure 3 is a cross-sectional view showing a filter structure for a fuel pump according to an embodiment of the present invention.

2 and 3, the fuel pump filter structure 10 includes an outer filtration layer 21, a first filtration layer 11, an intermediate filtration layer 22, a second filtration layer 13, and an inner filtration. Layer 23 and a protective mesh layer 31.

In the embodiment of the present invention, the inner filtration layer 23, the second filtration layer 13, the intermediate filtration layer 22, the first filtration layer 11, and the outer filtration layer 21 may be stacked in this order. The protective mesh layer 31 may be formed outside the outer filtration layer 21. When the fuel is filtered, the fuel may be sequentially filtered through the outer filtration layer 21, the first filtration layer 11, the intermediate filtration layer 22, and the inner filtration layer 23 of the second filtration layer 13. .

The outer filtration layer 21 may be located outside of the fuel pump filter structure 10. The outer filtration layer 21 may be a layer through which fuel passes after the protective mesh layer 31. The outer filtration layer 21 may include a polypropylene (PP) material. Alternatively, the outer filtration layer 21 may include a polyamide (Poly Amide, PA6 or PA66) material. The outer filtration layer 21 may be a nonwoven fabric manufactured by melt brown, spunbond, or needle punching.

Here, the needle punching manufacturing method is a method for physically bonding the web (WEB) using a special needle to the fiber. The thickness of the fiber can be varied depending on the number of punches of the needle, the density of the needle, and the like.

The spunbond manufacturing method is a method of spinning a raw material to self-adhesive by heat to form a web. Fabric design has the advantage of easy.

Melt brown manufacturing method is a method for producing by combining a uniform molten fiber web by spinning a synthetic polymer into a fine fiber by high pressure hot air.

The outer filtration layer 21 may have a larger average pore diameter than the first filtration layer 11 or the second filtration layer 13 described later. For example, the average pore size of the outer filtration layer 21 may be provided as 30 to 60 μm.

The first filtration layer 11 may be located between the outer filtration layer 21 and the intermediate filtration layer 22. Fuel passing through the outer filtration layer 21 may pass through the first filtration layer 11. The first filtration layer 11 may include a polypropylene (PP) material. Alternatively, the first filtration layer 11 may include a polyamide (Poly Amide, PA6 or PA66) material. The first filtration layer 11 may be a nonwoven fabric produced by the melt brown method. The first filtration layer 11 may have a smaller average pore diameter than the outer filtration layer 21. The first filtration layer 11 may have a larger average pore diameter than the second filtration layer 13. The first filtration layer 11 may have a smaller average pore diameter than the intermediate filtration layer 22. For example, the average pore size of the first filtration layer 11 may be provided to 20 to 30 ㎛.

The middle filtration layer 22 may be located between the first filtration layer 11 and the second filtration layer 13. The intermediate filter layer 22 may pass through the fuel passing through the first filter layer 11. The middle filtration layer 22 may include a polypropylene (PP) material. Alternatively, the intermediate filtration layer 22 may include a polyamide (Poly Amide, PA6 or PA66) material. The intermediate filtration layer 22 may be a nonwoven fabric produced by a spunbond method. The intermediate filtration layer 22 may have a larger average pore diameter than the first filtration layer 11. The middle filtration layer 22 may have a larger average pore diameter than the second filtration layer 13. The middle filtration layer 22 may have an average pore size equal to or greater than that of the inner filtration layer 23. As an example, the average pore size of the intermediate filtration layer 22 may be provided to 30 ~ 60 ㎛.

The second filtration layer 13 may be located between the middle filtration layer 22 and the inner filtration layer 23. Fuel passing through the intermediate filtration layer 22 may pass through the second filtration layer 13. The second filtration layer 13 may include a polypropylene (PP) material. Alternatively, the second filtration layer 13 may include a polyamide (Poly Amide, PA6 or PA66) material. The second filtration layer 13 may be a nonwoven fabric produced by the melt brown method. The second filtration layer 13 may have a smaller average pore diameter than the outer filtration layer 21, the intermediate filtration layer 22, or the inner filtration layer 23. The second filtration layer 13 may have a smaller average pore diameter than the first filtration layer 11. As an example, the average pore size of the second filtration layer 13 may be provided as 5 ~ 25 ㎛.

The inner filtration layer 23 may be located adjacent to the second filtration layer 13. The fuel passing through the second filtration layer 13 may pass through the inner filtration layer 23. The inner filtration layer 23 may include a polypropylene (PP) material. Alternatively, the inner filtration layer 23 may include a polyamide (Poly Amide, PA6 or PA66) material. The inner filtration layer 23 may be a nonwoven fabric produced by a spunbond method. The inner filtration layer 23 may have a larger average pore diameter than the first filtration layer 11 and the second filtration layer 13. For example, the average pore size of the inner filtration layer 23 may be provided to 30 ~ 60 ㎛.

The protective mesh layer 31 may be formed on the outermost side of the fuel pump filter structure 10. The protective mesh layer 31 may be combined with the outer filtration layer 21. The protective mesh layer 31 may include a polypropylene (PP) material. Alternatively, the protective mesh layer 31 may include a polyamide (Poly Amide, PA6 or PA66) material. The protective mesh layer 31 may prevent the fuel pump filter structure 10 from being exposed to and damaged by the fuel. The protective mesh layer 31 may have an average pore diameter equal to or greater than that of the outer filtration layer 21.

Each of the layers of the fuel pump filter structure 10 described above may be joined in a point fusion (P) manner. The individual layers of the fuel pump filter structure 10 are each combined, and in addition, they can be joined more firmly by the addition of point fusion bonding.

Unlike the above-described example, as shown in FIG. 4, the first filtration layer 11 may be provided as a plurality of layers 11a, 11b, and 11c. In FIG. 4, the first filtration layer 11 includes three layers 11a, 11b, and 11c, but the number of the first filtration layers 11 is not limited thereto. The first filtration layer 11 is provided substantially the same as the first filtration layer 11 of FIGS. 2 and 3.

However, the plurality of first filtration layers 11a, 11b, and 11c may be formed such that the average pore diameter gradually decreases toward the intermediate filtration layer 22 from the outer filtration layer 21. Even in this case, the plurality of first filtration layers 11a, 11b, and 11c may have a larger average pore diameter than the second filtration layer 13. In addition, the plurality of first filtration layers 11a, 11b, and 11c may have a smaller average pore diameter than the outer filtration layer 21 and the intermediate filtration layer 22.

Unlike the above-described example, as shown in FIG. 5, the second filtration layer 13 may be provided as a plurality of layers 13a, 13b, and 13c. In FIG. 5, the second filtration layer 13 includes three layers 13a, 13b, and 13c, but the number of the second filtration layers 13 is not limited thereto. The second filtration layers 13a, 13b, 13c are provided substantially the same as the second filtration layer 13 of FIGS. 2 and 3.

However, the plurality of second filtration layers 13a, 13b, and 13c may be formed such that the average pore diameter gradually decreases from the intermediate filtration layer 22 toward the inner filtration layer 23. Even in this case, the plurality of second filtration layers 13a, 13b, and 13c may have a smaller average pore diameter than the first filtration layer 11. In addition, the plurality of second filtration layers 13a, 13b, and 13c may have a smaller average pore diameter than the outer filtration layer 21 and the intermediate filtration layer 22.

Unlike the above-described example, as shown in FIG. 6, both the first filtration layer 11 and the second filtration layer 13 may be provided as a plurality of layers. In this case, the first filtration layer 11 of FIG. 6 described above may be provided substantially similarly to the embodiment of FIG. 4. In addition, the second filtration layer 13 of FIG. 6 may be provided substantially similarly to the embodiment of FIG. 5.

Hereinafter, the filtration performance of the fuel pump filter structure 10 of this invention, the fuel pump filter structure 1 of FIG. 1, and fuel is compared and demonstrated. 7 is a view showing a comparative embodiment of the filter structure for a fuel pump of FIGS. 1 and 7, and FIG. 8 is a graph showing fuel filtration performance of the filter structure for a fuel pump according to the comparative embodiment of FIG. 7.

Referring to FIGS. 7 and 8, the filter structure 1 for a general fuel pump was tested as having six filtration layers 3, 4, 5, 6, 7, and 8. Of the six filter layers (3,4,5,6,7,8), the remaining five filter layers (3,4,5,6,7) except the last filter layer (8) are in the direction in which fuel passes. The average pore size was set to gradually decrease. The two outermost layers 3, 8 of the six filtration layers 3, 4, 5, 6, 7, 8 were made of a nonwoven fabric produced by a spunbond method. The remaining four filtration layers (4, 5, 6, 7) used a nonwoven fabric produced by the melt brown method.

In the case of the fuel pump filter structure 10 of the present invention, the second filtration layer 13 is assumed to have two layers. The composition of each layer set the average pore size to the specification demonstrated by this invention.

The dust holding capacity (DHC) was confirmed by passing the fuel under the same conditions through the two fuel pump filter structures (1,10).

As a result, the value of the fuel pump filter structure 10 of the present invention is higher than that of the general fuel pump filter structure 11. As an example, the dust holding capacity value of the fuel pump filter structure 10 of the present invention is about 13% or more.

This is because the filtration layer has a pore size in which the average pore size is actually provided in a size larger than the average pore size, so that foreign matter larger than the average pore size can pass through during filtration. In addition, since the nonwoven fabric produced by the melt brown method is used at the center of the filtration layers of the conventional fuel pump filter structure 1, there are a large number of pores having a size larger than the average pore size, thereby limiting the filtration performance.

In the case of the present invention, the nonwoven fabric filtration layer manufactured by the melt brown method using a nonwoven fabric manufactured by the spunbond method with a larger average pore diameter between the nonwoven fabric filtration layers prepared by the melt brown method and having a gradually decreasing average pore size. This unfiltered large foreign matter can be filtered by the intermediate filtration layer 22 manufactured by the spunbond method once again to increase the efficiency of filtration. This filtration performance is shown well in the above experimental example.

As described above, according to one embodiment of the present invention, it is possible to improve the filtration performance of fuel by providing a filtration layer having a large average pore size between the filtration layers provided to gradually decrease the average pore size.

The foregoing detailed description illustrates the present invention. In addition, the above-mentioned contents show preferred embodiments of the present invention, and the present invention can be used in various other combinations, modifications, and environments. That is, changes or modifications may be made within the scope of the concept of the invention disclosed in the present specification, the scope equivalent to the disclosures described above, and / or the skill or knowledge in the art. The above-described embodiments illustrate the best state for implementing the technical idea of the present invention, and various modifications required in the specific application field and use of the present invention are possible. Thus, the detailed description of the invention is not intended to limit the invention to the disclosed embodiments. Also, the appended claims should be construed to include other embodiments.

10: filter structure for fuel pump 11: first filtration layer
13: second filtration layer 21: outer filtration layer
22: middle filtration layer 23: inner filtration layer
31: protective mesh layer

Claims (10)

In the fuel pump filter structure,
A first filtration layer 11 manufactured by a melt brown method and through which fuel passes;
An intermediate filtration layer (22) manufactured by a spunbond method and combined with the first filtration layer to allow the fuel to pass through the first filtration layer to pass therethrough;
A second filtration layer (13) manufactured by a melt brown method and combined with the intermediate filtration layer such that the fuel passing through the intermediate filtration layer passes; And
Including the inner filtration layer 23 is passed through the second filtration layer and made of a spunbond method combined with the second filtration layer,
The second filtration layer has a smaller average pore diameter than the first filtration layer,
The middle filtration layer,
It has a size larger than the average pore size of the first filtration layer, and is formed to have a size smaller than the foreign matter having the largest size of foreign matter passing through the first filtration layer, while being larger than the average pore size of the first filtration layer. The filter structure for a fuel pump which can improve the filtration performance of the filter structure for fuel pumps by filtering out some of the foreign substances which were not filtered by the said 1st filtration layer. The method of claim 1,
And the inner filtration layer is provided with a larger average pore diameter than the first filtration layer and the second filtration layer. The method of claim 1,
The first filtration layer is formed of a plurality of layers,
A plurality of the first filtration layer is a fuel pump filter structure is formed so that the average pore size gradually decreases toward the inner filtration layer. The method of claim 1,
The second filtration layer is formed of a plurality of layers,
The plurality of the second filtration layer is formed such that the average pore size gradually decreases in the direction from the intermediate filtration layer toward the inner filtration layer. delete The method of claim 1,
The outer side of the first filtration layer further includes an outer filtration layer coupled to the first filtration layer,
And the outer filtration layer has a larger average pore diameter than the first filtration layer. The method of claim 6,
The outer filter layer is a filter structure for a fuel pump is a non-woven fabric produced by the melt brown method, spunbond method or needle punching method. The method of claim 1,
A fuel pump filter structure having a protective mesh layer formed on the outermost side of the fuel pump filter structure. The method of claim 8,
Each layer of the filter structure for fuel pumps is a filter structure for a fuel pump coupled to the fusion welding method. The method of claim 8,
The outer side of the first filtration layer further includes an outer filtration layer coupled to the first filtration layer,
The outer filtration layer is provided with a larger average pore diameter than the first filtration layer,
And said first filtration layer, said second filtration layer, said outer filtration layer, said intermediate filtration layer, said inner filtration layer and said protective mesh layer comprise polypropylene or polyamide material.

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