TWI414679B - Fuel filter device and manufacturing method thereof - Google Patents

Abstract

A fuel filter device has a gap forming member made of a synthetic resin and keeping a filter body in a swollen state and also has a connector made of a synthetic resin and connecting the inner space of the filter body to a fuel suction opening. The gap forming member and the connector respectively have joint sections that are connected to each other through a through hole formed in the filter body. The inner sides of the joint sections function as a fuel flow path. A gap forming projection is provided on the gap forming member below its joint section, and the gap forming member and the connector are adapted so that they can be fusion bonded together at a position substantially directly above the gap forming projection.

Description

Fuel filter device and method of manufacturing same

The present invention relates to a fuel suction port installed in a fuel tank of an automobile or a locomotive or the like, and a filtering device for filtering moisture or foreign matter introduced into a fuel of an engine (internal combustion engine) via the fuel suction port.

In order to prevent moisture or foreign matter from being mixed into the fuel pumped from the fuel pump to the internal combustion engine in the fuel tank, a filter device is installed in the fuel suction port in the fuel tank to filter out the moisture or foreign matter.

Such a filtering device, as shown in Figs. 5 to 7 is a bag-shaped filter body 100 made of a filter medium 101, which is provided inside the filter body 100 to keep the filter body 100 in an expanded state. The spacer forming member 200 and the synthetic resin pipe joint 300 for connecting the internal space 103 of the filter body 100 to the fuel suction port Pa are configured. A spacer forming protrusion 202 is formed on the lower surface of the spacer forming member 200 to prevent the through-hole 201 of the flow path x formed as the fuel on the spacer forming member 200 from being stuck by the filter member 101 which is flattened by the suction force so as to impede fuel flow. The situation happened. The pipe joint 300 and the gap forming member 200 are conventionally formed such that the flange 301 of the pipe joint 300 and the peripheral portion of the space forming member 200 forming the through hole 201 are relatively joined by the filter medium 101 to sandwich the filter medium 100 between the two flanges. A contact surface 203 is formed between the outer peripheral edge of the through hole 201 of the spacer forming member 200 and the outer peripheral edge of the through hole 201 of the spacer forming member 200, and a contact surface 203 for crimping the ultrasonic welding joint H' is placed. H' pressurizes and welds the welded joint portion 400 which is joined to each other directly above the contact surface 203 (Fig. 6), and the pipe joint 300 is formed integrally with the spacer member 200 and the filter medium 100. According to the conventional filter device, in the welded portion, the spacer forming member 200 must have the peripheral portion of the through hole 201, the contact surface 203 of the fusion joint H', and the space forming projection 202. The necessary size thus hinders the simplicity and compactness of the filter device.

The main problem to be solved by the present invention is to provide a solution to the above-described fuel filtering device, in addition to the fact that the pipe joint and the spacer forming member which are joined to each other by the through holes formed in the filter body can be welded and integrated. It is also possible to minimize the size of the spacer forming member at the joint portion.

In order to achieve the above object, the fuel filtering device of the present invention comprises the following constitutions (1) to (3): (1) a bag-shaped filter body formed of a filter material, which is accommodated in the filter body to maintain the filter body frequently a synthetic resin spacer member in an expanded state, and a synthetic resin pipe joint for connecting the internal space of the filter body to the fuel suction port; (2) the spacer forming member and the pipe joint respectively have a borrowing The through-hole formed in the filter body can be inserted into the joint portion of the joint, and the inner side of the joint portion is also formed as a fuel flow path; (3) the space-forming member is formed with a space forming a protrusion below the joint portion In addition, the gap forming member and the pipe joint are each formed with a fusion portion which can be welded to each other by a slightly upper position from the interval forming projection to the fuel flow path.

The spacer forming member has a space forming projection below the joint portion, and the gap forming member and the pipe joint can be fused from a position directly above the space forming protrusion to a portion between the fuel flow paths, and the two are formed. Since the position of the joined portion of the joined portion is in this relationship, the space forming protrusion provided in the gap forming member for preventing the filter material from sticking to the flow path of the fuel can be disposed in close contact with the flow path without being between the flow path and the flow path. The gap is disposed, or the interval is made as close as possible to the flow path, so that the overall size of the spacer forming member can be minimized, so that the entire filter device can be reasonably compact and compact.

If the spacer forming member and the pipe joint are arranged by one of the two When the portion is fitted to the other recessed portion and assembled, and the fusion portion is provided at the fitting portion, the two members can be firmly welded to each other at the fitting portion.

When the pressure-welding surface of the tool or the mold for ultrasonic welding, high-frequency welding, vibration welding, laser light welding, or spin welding is formed at the end portion of the above-described space-forming projection, the space-forming projections can be used to form the space. The member and the pipe joint are welded together at a position slightly above the space forming projection to the fuel flow path.

When the hole edge portion of the through hole forming the interval forming member of the fuel flow path is formed to form a projection around the through hole in a circumferential direction and a space is formed between the adjacent spaces, the filter can be filtered. The fuel sucked into the filter body is sent to the fuel suction port through the through hole from the interval between the adjacent intervals forming projections.

Further, in the present invention, the method for manufacturing the fuel filtering device described above is completed by the following operations (1) to (3), that is, (1) forming a joint portion of the spacer forming member and the pipe joint via the forming portion. After the through holes on the filter medium of the filter body are joined to each other; (2) the ultrasonic welding, the high-frequency welding, the vibration welding, the laser welding or the rotary welding die or the tool is pressed against the end portion of the space forming protrusion a crimping surface for integrally welding the spacer forming member and the pipe joint; and subsequently (3) forming the filter material into a bag shape to receive the spacer forming member inside the filter body, and at the same time, the pipe joint is protruded A filter device for fuel is formed outside the filter body.

According to the fuel filtering device of the present invention, the size of the member forming the member at the joint portion of the pipe joint and the spacer forming member which are joined to each other by the through hole formed in the filter body can be maintained at a predetermined diameter in the through hole. The reduction is minimized, so that the filter device can be reasonably compacted or miniaturized.

BRIEF DESCRIPTION OF THE DRAWINGS A preferred embodiment of the present invention will be described in detail with reference to FIGS. 1 to 4 of the accompanying drawings. FIG. 1 is a cross-sectional view showing the use state of the filter device of the present embodiment, and FIGS. 2 and 3 respectively show The filter device is viewed from obliquely above and obliquely from below, and FIG. 4 is a view showing that the spacer forming member 2 and the pipe joint 3 are welded to each other by the space forming protrusion 20e formed on the space forming member 2. A cross-sectional view in which the welding mold (tool) H is pressure-bonded to the space forming protrusion 20e of the space forming member 2 is integrated.

The fuel filtering device according to the present embodiment is for attaching to a fuel suction port Pa in a fuel tank of an automobile or a locomotive, in order to prevent water or foreign matter from being drawn into the internal combustion engine (engine) via the fuel suction port Pa. Inside the internal combustion engine.

Typically, such a filtering device is installed in the suction port Pa having the fuel suction port P and the fuel suction pipe P entering the fuel tank interior T. Such a filtering device generally mounts the lower portion of the filter body 1 against the bottom wall Ta of the fuel tank or the outer casing of the fuel pump module.

The fuel sent to the internal combustion engine via the fuel suction port Pa is pumped by a fuel pump (not shown) provided in the fuel tank T or a fuel pump disposed outside the fuel tank.

The filter device is composed of a filter body 1, a spacer forming member 2, and a pipe joint 3.

The filter body 1 is a bag-like body made of the filter medium 10. As a material of the filter material, a mesh made of a synthetic resin, a knitted fabric, a woven fabric, or a non-woven fabric sheet can be used. Usually, one or more of the sheet-like filter materials 10 are selected, and two or more sheets are stacked in a state of being folded one by one, and then a space in which the upper and lower sheets can form a space is formed by applying a band-like weld to the periphery other than the folded edge. The two ends of the welded portion 14 are respectively connected to both ends of the folded portion which are not welded, and the bag-shaped filter body 1 is formed. It is also possible to use two or more sheets of the sheet-like filter material 10, respectively, for two or more sheets. The first filter medium group 10 and the second filter material group 10 which are stacked are formed so as to face each other on the inner side of the filter body 1 after the predetermined structure, and then the outer side of the filter body 1 is welded to form a welded portion. Part of it is the bag-shaped filter body 1 of the internal space. For the filter material 10 after welding, the inner edge of the band of the strip-shaped welded portion can be cut and shaped. The spacer forming member 2 should be placed between the flange and the periphery to be welded before the filter material 10 is welded, or placed inside the periphery of the four portions to be welded, and the spacer member 2 and the filter medium are welded by welding. 10 is fused together and housed in the bag-shaped filter body 1.

Typically, the outer side of the filter body 1 should be provided with a mesh or textile layer having oil-water separation, and the inner side should be provided with one or more filter materials for filtering dust.

The spacer forming member 2 is formed of a synthetic resin and is provided in the above-described filter body 1 to keep the filter body 1 in an expanded state.

As shown in Figs. 1 to 3, the spacer forming member 2 of the illustrated embodiment is formed by a disk-shaped base portion 20 and a plate-like extending portion 21 whose one end is integrally connected to the base portion 20 and whose other end extends laterally. Composition. A circular through hole 20a is formed in the center of the base portion 20. The upper portion of the base portion 20 is formed with a short cylindrical portion 20c having an inner diameter equal to the through hole 20a and communicating with the through hole 20 in the inner space of the cylinder. The base portion 20 of the short cylindrical portion 20c is formed with an annular groove 20d, and the groove bottom of the annular groove 20d forms a fusion portion 4 which will be described later. A plurality of spacer forming projections 20e are formed on the lower surface of the base portion 20. In the illustrated embodiment, the interval forming projection 20e is an annular projection projecting downward from the lower surface of the base portion 20 around the through hole 20a by a minute distance from the hole edge 20b of the through hole 20a of the base portion 20. Four circular arc-shaped spacer forming projections 20e are formed by cutting four portions in equal arc length. In other words, in the illustrated embodiment, a plurality of sheets are formed around the periphery of the through hole 20a in the portion of the hole edge 20b of the through hole 20a forming the gap portion 20 of the fuel flow path x. The interval forming protrusions 20e are formed at intervals. With this configuration, the fuel that has been filtered into the filter body 1 can be fed through the through hole 20a through the space between the adjacent portions of the space forming projections 20e. Inside the fuel suction port Pa. The above-described annular groove 20d is disposed directly above the interval forming projection 20e. The extending portion 21 forms the elongated plate body 21a, and the narrower the width from the one end of the connecting base portion 20 to the free end portion, the narrower the width, the plate body 21a is provided with a plurality of slightly square through holes 21b, 21b, ..., and freely Spacer forming projections 21c projecting downward from the lower surface of the extending portion 21 are respectively protruded from the left and right edges of the end portion and the slightly intermediate portion and the left and right edges of the base portion 20. The space between the partition forming projections 20e of the base portion 20 and the extending portion 21 is formed to have substantially the same protruding size by the forming projections 21c.

The pipe joint 3 is formed of a synthetic resin and is used to connect the gap forming member 2 so that the internal space 15 of the filter body 1 communicates with the fuel suction port Pa.

In the illustrated embodiment, the pipe joint 3 is a cylindrical main portion 30 that is opened at both ends of the cylinder, and the connecting ear portion 31 is provided at the upper end of the cylindrical main portion 30, and is formed in the cylindrical main body. The flange portion 32 at the lower end of the portion 30 is formed. The connection ear portion 31 is formed in a plate shape projecting outward from the cylindrical main portion 30, and a fixing hole 31a is provided thereon. The pipe joint 3 and the fuel suction port Pa of the suction pipe P are connected to the inside of the cylindrical main portion 30 from the upper end of the cylindrical main portion 30 by the fuel suction port Pa. The outer edge of the flange portion 32 is formed in a circular shape, and a short tube having an inner diameter and an outer diameter of the short cylindrical portion 20c of the spacer forming member 2 which is slightly equal to the outer diameter of the short portion 20c of the spacer forming member 2 is formed on the lower inner edge portion of the flange portion 32. Part 32a. When the inner diameter of the short cylindrical portion 32a is fitted into the outer diameter of the short cylindrical portion 20c of the spacer forming member 2, the protruding end 32b of the short cylindrical portion 32a is inserted into the annular groove 20d formed on the upper surface of the base portion 20 of the spacer forming member 2. Inside.

In the present embodiment, the short cylindrical portion 20c as the joint portion of the partition forming member 2 constitutes the through hole 11 formed in the filter medium 10 of the filter body 1 through the through hole 11 formed in the filter medium 10 constituting the filter body 1. The embedded pipe joint 3 is used as the short cylindrical portion 32a of the joint portion, and after the space forming member 2 and the pipe joint 3 are joined to each other, ultrasonic wave welding, high frequency welding, vibration welding, laser light welding or spin welding is used. Mold or tool H (for example, mining The drill angle or the drill bit when the ultrasonic wave is welded, the electrode at the time of the high-frequency welding is pressed against the end portion of the space forming protrusion 20e formed on the lower surface of the partition forming member 2 as the abutting surface 20f, and the space is formed as a member 2 and the pipe joint 3 are integrally welded to the pipe joint 3 by the protrusion 20e directly above it.

Subsequently, the above-mentioned filter medium 10 is formed into a bag shape to accommodate the space forming member 2 inside the filter body 1, and the pipe joint 3 is exposed to the outside, and the complete filter device is completed.

The spacer forming member 2 and the pipe joint 3 are formed by integrating the short portion 32a of the projection 33 provided in the pipe joint 3 into the annular groove 20d of the recess 22 provided in the partition forming member 2, and are integrally joined and integrated, and at the same time, the fusion portion 4 is formed. Since it is provided in the position of this fitting part, the two members 2 and 3 can be firmly welded and integrated in this fitting part.

In the illustrated example, the front end portion of the space forming member 2 is formed with a flat surface in which the tool H can be in surface contact to form the abutting surface 20f for the tool H, and at the same time, the space forming protrusion 20e. The cross section which is formed in the direction orthogonal to the direction of the protrusion is formed to have the same area as the abutting surface 20f at any position, so that the space for forming the spacer 20e via the spacer forming projection 20e can be The slightly upper position is used as the fusion portion 4, and the gap forming member 2 and the pipe joint 3 are integrally fused by ultrasonic welding or high-frequency welding (see Fig. 4).

The diameter of the through hole 11 of the filter medium 10 constituting the filter body 1 is slightly equal to or slightly larger than the outer diameter of the short cylindrical portion 20c of the flange portion 32 of the pipe joint 3, and the hole edge portion 12 of the through hole 11 of the filter medium 10 is held. The space between the base portion 20 of the member 2 and the flange portion 32 of the pipe joint 3 is formed by the fitting of the fitting and welding of the fusion portion 4. In the first drawing, the projections 34 located on the outer side of the short cylindrical portion 32a and the corresponding concave portions 23 are used to bend and flatten the filter medium 10 sandwiched between the projections 34 and the recesses 23, thereby improving the through hole 11 of the filter medium 10. The holding force of the hole edge portion 12.

According to the filter device of the present embodiment, the space forming member 2 has the space forming protrusions 20e below the joint portion, and the space forming member 2 and the pipe joint can be welded to each other at a position substantially above the space forming protrusion 20e. In this case, the position is the fusion portion 4, and the space for forming the projections 20e for preventing the filter material 10 from sticking to the fuel flow path x (the through hole of the base portion 20) of the space forming member 2 to the flow path x The interval between them may be left or the filter device may be formed in such a state that the interval is as small as possible. Therefore, the shape of the spacer forming member 2 can be miniaturized, and the entire filter device can be rationalized and simplified.

1‧‧‧filter

10‧‧‧ Filter media

11‧‧‧through holes

12‧‧‧ hole edge

13‧‧‧Folding

14‧‧‧Fuse Department

15‧‧‧Internal space

2‧‧‧ interval forming members

20‧‧‧ base

20a‧‧‧through hole

20b‧‧‧ hole edge

20c‧‧‧ Short tube

20d‧‧‧ annular groove

20e‧‧ ‧ forming protrusions

20f‧‧‧Abutment

21‧‧‧Extension

21a‧‧‧Slim board

21b‧‧‧through hole

21c‧‧‧ spacer formation protrusion

22‧‧‧ recess

23‧‧‧ recess

3‧‧‧ pipe joint

30‧‧‧Cylinder main part

31‧‧‧Connecting ears

31a‧‧‧Fixed holes

32‧‧‧Front

32a‧‧‧ Short tube

32b‧‧‧ Highlight

33‧‧‧ protrusion

34‧‧‧Protrusion

4‧‧‧Full Department

T‧‧‧ fuel tank interior

Ta‧‧‧ bottom wall

P‧‧‧fuel suction pipe

Pa‧‧‧fuel inlet

H‧‧‧welding tool (mold)

X‧‧‧Fuel flow path

1 is a cross-sectional view showing the internal structure and a use state of the filter device, FIG. 2 is a top perspective view showing the filter device, FIG. 3 is a bottom perspective view of the filter device, and FIG. 4 is a schematic view showing the filter device being welded. Fig. 5 is a cross-sectional view showing the structure of a conventional filter device, Fig. 6 is a view showing a conventional filter device when welding is performed, and Fig. 7 is a perspective view showing a conventional filter device for performing a spacer forming member.

1‧‧‧filter

2‧‧‧ interval forming members

3‧‧‧ pipe joint

4‧‧‧Full Department

10‧‧‧ Filter media

11‧‧‧through holes

12‧‧‧ hole edge

13‧‧‧Folding

14‧‧‧Fuse Department

15‧‧‧Internal space

20‧‧‧ base

20a‧‧‧through hole

20b‧‧‧ hole edge

20c‧‧‧ Short tube

20d‧‧‧ annular groove

20e‧‧ ‧ forming protrusions

20f‧‧‧Abutment

22‧‧‧ recess

23‧‧‧ recess

30‧‧‧Cylinder main part

31‧‧‧Connecting ears

31a‧‧‧Fixed holes

32‧‧‧Front

33‧‧‧ protrusion

34‧‧‧Protrusion

P‧‧‧fuel suction pipe

T‧‧‧ fuel tank interior

Ta‧‧‧ bottom wall

X‧‧‧Fuel flow path

Claims (2)

A filter device for a fuel is a bag-shaped filter body formed of a filter material, and is disposed in a synthetic resin spacer formed inside the filter body to keep the filter body in an expanded state, and is used for the filter body. a synthetic resin pipe joint in which an inner space is in communication with a fuel suction port; and the space forming member and the pipe joint respectively have a joint portion through which a through hole formed in the filter body can be fitted and joined to each other, A flow path of the fuel is formed on the inner side of the joint portion, and a space for forming the space is formed on the lower surface of the space forming member, and a contact surface of the upper surface of the space forming member and the lower surface of the pipe joint is formed. a fusion-welded portion that is welded to each other to fuse the two; the spacer-forming projection is formed on a hole edge portion of the space-forming member that is close to the through-hole, and the end portion is formed before the space-forming protrusion To undertake the welding surface of the welding tool or the mold for ultrasonic welding, high frequency welding or vibration welding, so that the welding tool or the mold can form a protrusion from the gap The end face is slightly upwardly positioned to straddle the fuel flow path, and the gap forming member and the pipe joint are welded to integrate the two; and the fusing portion is located at the opposite end face of the protrusion which is slightly facing the interval to The interface between the edge portions of the through holes. A method of manufacturing the fuel filtering device of claim 1, comprising the steps of: joining the two joint portions of the spacer forming member and the pipe joint through the through holes formed in the filter material constituting the filter body; Acoustic welding, high-frequency welding or vibration welding using a die or a tool to press-contact a crimping surface formed at an end portion of the gap forming projection to weld the spacer forming member and the pipe joint to each other to fuse the two The portion is located at an abutting surface between the opposite end surface of the spacer forming protrusion and the edge portion of the through hole; and then the filter medium is formed into a bag shape to accommodate the spacer forming member in the filter Inside the body, the pipe joint is protruded outside the filter body to constitute a fuel filtering device.