JPH11200976A - Fuel filter - Google Patents

Abstract

(57) [Problem] To provide a fuel filter which is easy to assemble, is inexpensive, and whose filter main body is not easily deformed. A core member (13) is formed integrally with a pump case (11) and protrudes into the pump case (11).
The core member 13 is formed in a net shape as a whole, and a communication passage 13 a formed in each mesh communicates a space on the filter body 30 side with an internal passage 13 b formed inside the core member 13. Since the filter main body 30 surrounds the core member 13, the filter main body 30 can be easily assembled to the pump case 11 without using an adhesive or the like, so that the manufacturing cost is reduced. Further, since the core member 13 increases the strength of the filter body 30, the fuel is
Even when the filter body 30 receives a force from the fuel flow due to the pressure loss of the white body when passing through zero, it is possible to suppress the filter body 30 from being deformed.

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 removing foreign substances in fuel.

[0002]

2. Description of the Related Art As a fuel filter used for an in-tank type fuel pump, for example, International Publication No. WO96 / 2
As disclosed in Japanese Patent No. 3569, there is known a fuel filter having a C-shaped cross section disposed on the outer periphery of a pump body. FIG. 4 shows an example of a fuel pump using such a fuel filter.

[0003] The fuel pump 100 is housed in a fuel tank (not shown).
Has a pump case 102 and a cap 103 that covers the opening of the pump case 102. Filter body 10
Reference numeral 5 is formed by laminating filter media to form a C-shaped cross section. Case 1 housing filter body 105
The portion 01 and the filter body 105 constitute a fuel filter. The filter body 105 is fixed to the pump case 102 with an adhesive 106. The fuel discharged from the discharge pipe 104a of the pump body 104 flows downward from the upper part of FIG. 4 to the lower part of the filter body 105, and moves upward again in FIG. The fuel is supplied from a fuel supply pipe (not shown) to the outside of the fuel tank.

[0004]

However, in the fuel filter used for the fuel pump 100 shown in FIG.
Since the filter main body 105 is fixed to the pump case 102 using the adhesive 106, the work of assembling the filter main body 105 to the pump case 102 is complicated, the number of steps is increased, and the manufacturing cost is increased. Also, due to the pressure loss of the filter body 105, the fuel
, The filter body 105 may be deformed.

[0005] Further, the shape of a filter body formed by laminating filter media is limited, and the space in which a fuel filter can be installed is limited. Further, the filter body formed by laminating the filter media has voids that do not contribute to the removal of foreign substances between the layers, so that the dust collection efficiency is low. There is a problem that the volume of the filter body becomes large in order to sufficiently remove foreign matter in the fuel.

Further, since the roughness of each part of the filter medium is substantially uniform, the minimum particle size of the foreign matter that can be removed is equal in each part. That is, foreign matter that has not been removed at the inlet side of the filter body passes through the filter body and is discharged as it is, so that clogging is likely to occur at the inlet side of the filter body. Therefore,
Since the entire filter body cannot be used as a filter, the life of the filter body is shortened.

An object of the present invention is to provide a fuel filter which is easy to assemble, is inexpensive, and whose filter main body is not easily deformed. Another object of the present invention is to provide a fuel filter that has high dust collection efficiency and can be miniaturized. Another object of the present invention is to provide a fuel filter having a long life.

[0008]

According to the fuel filter of the present invention, the filter body surrounds the core member projecting into the filter case.
The filter body can be easily assembled to the filter case without using an adhesive or the like. Therefore, the number of assembling steps is reduced, and the manufacturing cost is reduced.

Further, since the core member increases the strength of the filter body, the filter body is deformed even if the filter body receives a force from the fuel flow when the fuel passes through the filter body due to the pressure loss of the filter body. Can be suppressed. According to the fuel filter of the second aspect of the present invention, since the communication passage is formed in the entire core member, the flow passage area when fuel flows from the filter body into the internal passage of the core member increases. Therefore, since the pressure loss of the fuel filter is reduced, if the pressure of the fuel flowing into the fuel filter is the same, a larger amount of fuel can be discharged by forming a communication passage through the entire core member.

According to the fuel filter of the third aspect of the present invention, the core member is formed integrally with the filter case. Therefore, the number of parts is reduced and the number of assembling steps is reduced, so that the manufacturing cost is reduced. According to the fuel filter of the fourth aspect of the present invention, the filter body is formed of a molded body. Here, the “formed body” means a structure in which fibers are collected in a cotton-like manner. Since the molded body can be formed by sucking the fiber dissolved in the liquid into a container having a predetermined shape, for example, by sucking the fiber dissolved in the liquid into the filter case using the communication passage of the core member as a suction port, The filter main body can be attached to the filter case while the filter main body is being formed. Therefore, the number of manufacturing steps of the fuel filter is reduced, and the manufacturing cost is reduced.

Further, since the molded body can be easily molded into an arbitrary shape, a fuel filter can be manufactured according to the shape of the installation space. Therefore, the degree of freedom when mounting the fuel filter is increased. Further, since the molded body does not have unnecessary voids inside, a high dust collection capability can be realized with a small volume. Therefore, the size of the fuel filter can be reduced.

According to the fuel filter of the fifth aspect of the present invention, the molded body constituting the filter body is dense near the core member and becomes coarser as the distance from the core member increases. Large foreign matter is removed on the side, and the foreign matter to be removed becomes smaller as approaching the core member. Therefore, the size of the foreign matter to be removed is different between the inlet side and the outlet side of the filter body, and the foreign matter is removed by the entire filter body, so that the life of the filter body is extended.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A plurality of embodiments showing an embodiment of the present invention will be described with reference to the drawings. (First Embodiment) FIG. 1 shows an example in which a fuel filter according to a first embodiment of the present invention is used in an in-tank type fuel pump as a fuel supply device.

The fuel pump 1 is accommodated in a fuel tank (not shown), and a resin case 10 is
And a cap 12. Pump case 1
1 and cap 12 are joined by welding or the like. Filter body 30 of pump case 11 and cap 12
Is also used as a filter case, and the filter case portion formed by the pump case 11 and the cap 12 and the filter body 30 constitute a fuel filter.

The pump case 11 houses a pump body 20 and a filter body 30. The discharge pipe 21 of the pump body 20 is connected to the fuel inlet 11 a of the pump case 11 by a gasket 22, and the pump body 20 discharges the fuel sucked from the suction filter 23 from the discharge pipe 21. The suction filter 23 is a filter for removing large foreign matter, and the filter body 30 is a filter for removing small foreign matter not removed by the suction filter 23.

One end of the connecting pipe 24 is connected to a fuel outlet 11b of the pump case 11 by a joint 25, and the other end is connected to a fuel supply pipe (not shown) at a mounting portion 11c shown in FIG. The pump case 11 is mounted on a fuel tank (not shown), and a fuel supply pipe and a fuel return pipe (not shown) are attached to mounting portions 11c and 11 shown in FIG.
d.

The core member 13 is formed integrally with the pump case 11 and protrudes into the pump case 11. The core member 13 is formed in a net shape as a whole, and a communication passage 13 a penetrating the peripheral wall of the core member 13 and formed in each mesh is formed by a space on the filter body 30 side and an internal passage 13 b formed inside the core member 13. And communicates. The internal passage 13b communicates with the inside of the fuel outlet 11b.

The filter body 30 is formed into a C-shaped cross section by a molded body, and surrounds the periphery of the core member 13. The material forming the filter body 30 is such that the vicinity of the core member 13 is dense, and the material becomes coarser as the distance from the core member 13 increases. The suction pump case 11 is filled with the member 13.

Next, the operation of the fuel pump 1 will be described. When the drive current is supplied to the pump body 20, the pump body 20 discharges the fuel sucked up from the suction filter 23 from a discharge port formed in the discharge pipe 21. The discharged fuel flows into the filter body 30, and the filter body 30
Removes foreign matter. The fuel that has passed through the filter body 30 is sent out of the fuel tank from the connecting pipe 24 through the fuel supply pipe through the communication path 13a and the internal path 13b.

The material of the molded body constituting the fuel filter 30 is dense near the core member 13 and becomes coarser as the distance from the core member 13 increases. At the fuel inlet side of the filter body 30, those having a large particle size are removed. And the core member 13
As the particle size approaches, the particle size of the foreign matter to be removed becomes smaller. Therefore, foreign matter is removed from the entirety of the filter body 30, so that clogging of only a specific portion of the filter body with foreign matter is prevented, and the life of the filter body 30 is extended.

Further, since the communication passage 13a is formed in the entire core member 13 having a large surface area, the sum of the flow passage areas of the entire communication passage 13a increases. Therefore, the pressure loss when flowing into the internal passage 13b from the filter main body 30 is reduced, so that a large amount of fuel can be sent out of the fuel tank if the discharge capacity of the pump main body is the same. With the same fuel delivery amount, the discharge capacity of the pump body can be reduced, and the pump body can be downsized.

(Second Embodiment) FIG. 3 shows a fuel filter according to a second embodiment of the present invention. The fuel filter 40 is provided in a fuel supply system outside the fuel tank. Fuel filter 4
0 filter case 41 is formed of resin,
It is composed of a case 42 and a second case 44. The first case 42 and the second case 44 are connected by welding or the like. A fuel inlet pipe 43 and a fuel outlet pipe 45 are formed in the first case 42 and the second case 44, respectively.
It is connected to a fuel pipe (not shown) outside the fuel tank.

The hollow core member 46 is integrally formed with the second case 44, protrudes into the filter case 41, and is formed in a net shape. A communication passage 46a penetrating the peripheral wall of the core member 46 and formed in each mesh communicates the space on the filter body 50 side with an internal passage 46b formed inside the core member 46, and the internal passage 46b is connected to the fuel outlet pipe 45. Communicates with the interior of the

The filter body 50 is formed of a molded body and surrounds the periphery of the core member 46. Since the molded body constituting the filter body 46 is dense near the core member 46 and becomes coarser as the distance from the core member 46 increases, foreign matter having a large particle size is removed on the fuel inlet side of the filter body 50. You. Then, the particle size of the foreign matter to be removed becomes smaller as approaching the core member 46. Therefore, foreign matter is removed from the entire filter body 50, so that clogging of only a specific portion of the filter body with foreign matter is prevented, and the life of the filter body is extended.

In the above-described plurality of embodiments showing the embodiment of the present invention, since the filter body surrounds the core member, the filter body is assembled to the filter case without using an adhesive or the like. Can be. Therefore, the attachment of the filter body is facilitated, and the manufacturing cost is reduced. Further, since the core member increases the strength of the filter main body, even when the filter main body receives a force from the fuel flow due to its own pressure loss when the fuel passes through the filter main body, it is possible to suppress the filter main body from being deformed. .

In the above embodiments, the communication passage is formed in the entire core member to increase the flow passage area, thereby reducing the pressure loss of the fuel filter and increasing the fuel delivery amount.
It is not necessary to form a communication path in the entire core member as long as a desired fuel delivery amount can be obtained. In the above embodiments, since the filter main body is formed of a molded body, unnecessary voids are not generated inside the filter main body when the filter medium is laminated, so that a large amount of foreign substances can be removed with a small volume. Therefore, the size of the fuel filter can be reduced.

In the above embodiments, the molded body is formed by suction. However, the molded body may be formed by filling a filter case with a cotton-like fiber. If the filter body surrounds the periphery of the core member, a structure in which a filter material is laminated may be used instead of the molded body. By hollowing out the inside after laminating the filter media, the filter body can be fitted to the core member. By fitting the filter body to the core member, the filter body can be easily assembled to the filter case without using an adhesive or the like. Further, the filter case may be formed of metal.

In the above-mentioned embodiments, the compact is dense near the core member and is formed so as to be rough at the fuel inlet side. Good.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view taken along line II of FIG. 2, showing a fuel pump according to a first embodiment of the present invention.

FIG. 2 is a plan view showing a fuel pump in which a filter body according to the first embodiment is partially cut.

FIG. 3 is a sectional view showing a fuel filter according to a second embodiment of the present invention.

FIG. 4 is a sectional view showing a conventional fuel pump.

[Explanation of symbols]

 Reference Signs List 1 fuel pump 10 case (filter case) 11 pump case (filter case) 12 cap (filter case) 13 core member 13a communication passage 13b internal passage 20 pump body 30 filter body 40 fuel filter 41 filter case 42 first case (filter case) ) 44 Second case (filter case) 46 Core member 46a Communication passage 46b Internal passage 50 Filter body

Claims (5)

[Claims] 1. A filter body for removing foreign matter in fuel, a filter case for housing the filter body, and a core member protruding into the filter case and surrounded by the filter body and communicating with a fuel outlet. And a core member having a communication passage communicating the internal passage with the filter body side space. 2. The fuel filter according to claim 1, wherein the communication path is formed in the entire core member. 3. The fuel filter according to claim 1, wherein the core member is formed integrally with the filter case. 4. The fuel filter according to claim 1, wherein the filter main body is formed of a molded body. 5. The fuel filter according to claim 4, wherein the compact is dense near the core member, and becomes coarser as the distance from the core member increases.