JPH057496Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention is preferably installed in a fuel tank of an automobile, etc., and used for pressure-feeding the fuel in the fuel tank to a fuel injection valve, etc. The present invention relates to a fuel pump, and particularly relates to a fuel pump that can prevent a reduction in discharge flow rate due to wear of the pump section due to iron powder such as welding spatter remaining in the fuel tank.

[Conventional technology]

FIG. 2 shows a conventional fuel pump installed in a fuel tank.

In the figure, 1 indicates a fuel tank, and the tank 1 is formed in the shape of a cylinder with a lid, and includes an upper case 2 having a flange 2A protruding outward from an open end on the lower end side;
The lower case 3 is formed into a bottomed cylindrical shape and has a flange 3A protruding outward from the open end on the upper end side.The upper case 2 has a flange 3A projecting outward from the open end thereof. An insertion hole 2B is bored. The cases 2 and 3 have flanges 2A,
3A, and are integrally joined by a welded portion 4 such as seam welding. In addition, upper and lower buffles 5 and 6 are joined to the cases 2 and 3 by welding parts 7 and 8, such as spot welding, respectively, and the buffles 5 and 6 are connected to the case 2 and 3 so that the liquid level of the fuel F is protected against vibrations of the vehicle. It is designed to prevent large changes due to inclination, etc., and to suppress rocking noise (passing noise) of the fuel F.

9 is fixed around the insertion hole 2B of the upper case 2,
Main bracket with the insertion hole 2B covered, 10
indicates a sub-bracket hanging perpendicularly from the main bracket 9, and the sub-bracket 10
is adapted to support the fuel pump 11 in a state submerged in the fuel F of the fuel tank 1.

Reference numeral 11 indicates a turbine-type fuel pump; 12 indicates a pump body of the fuel pump 11;
2 has a built-in motor section 13 consisting of a DC motor or the like, and a turbine-type pump section 14 that is rotationally driven by the motor section 13, and the sub-bracket 1
0 is installed in the fuel tank 1 as shown in the figure. 15 is a fuel suction port provided on the lower end side of the pump body 12; 16 is a fuel suction port provided on the base end side of the pump body 12;
A filter 17 is provided at the tip end of the suction pipe 16, and the filter 17 is constantly pressed against the bottom side of the fuel tank 1 by a spring or the like (not shown). There is.
The filter 17 is formed of a mesh of approximately 70 μm, for example, and is designed to prevent foreign matter having a particle size larger than this from entering the pump body 12.

Reference numeral 18 indicates a fuel discharge port provided on the upper end side of the pump body 12, 19 indicates a discharge pipe whose base end side is connected to the discharge port 18, and the discharge pipe 19 penetrates the main bracket 9 and projects to the outside. , the tip side thereof is connected to a fuel supply pipe (not shown). The discharge pipe 19 is connected to a filter 17.
The fuel F sucked into the pump main body 12 from the pump body 12 is discharged to a fuel injection valve (not shown) through a fuel supply pipe. A small-diameter return port (not shown) is provided on the lower end side of the pump body 12, and the suction port 1 is provided through a filter 17.
The vapor in the fuel F sucked from 5 is returned along with a portion of the fuel F from this return port in the direction of arrow A.

In the conventional technology configured in this way, when the pump unit 14 is driven by the motor unit 13 of the pump body 12, the fuel F in the fuel tank 1 is transferred to the filter 1.
7. It is sucked into the pump body 12 from the suction port 15 via the suction pipe 16, and is drawn into the pump body 12 from the discharge port 18.
9, etc., to the fuel injection valve. At this time, a part of the fuel F sucked into the pump body 12 is returned from the return port in the direction of arrow A along with the vapor mixed in the fuel F, and this vapor is discharged from the discharge port 18 together with the fuel F. It is designed to prevent

[Problem that the invention attempts to solve]

By the way, in the above-mentioned conventional technology, the upper case 2 and the lower case 3 of the fuel tank 1 are joined by a welded part 4 such as seam welding, and the upper and lower buffs 5 and 6 are joined by a welded part such as spot welded. 7 and 8, these welded parts 4, 7,
Welding spatters 8 and the like turn into iron particles and iron powder 20 (hereinafter referred to as iron powder 20) and remain in the fuel tank 1. The iron powder 20 is, for example,
Since they are formed with very small particle sizes of about 30 to 50 μm, it is difficult to remove them by cleaning the inside of the fuel tank 1, and it is difficult to remove them by cleaning the inside of the fuel tank 1.
1, it gradually peels off from the welded parts 4, 7, and 8 even when the fuel F is stirred or the vibration of the vehicle occurs.
It gets mixed into the fuel F. In addition, this iron powder 2
0 also occurs from rust inside the fuel tank 1.

Therefore, in the prior art, since a relatively large amount of iron powder 20 remains in the fuel tank 1, these iron powders 20 are returned to the pump body 12 by the return flow in the direction of arrow A from the return port. It is stirred with the fuel F at the lower end side, passes through the filter 17 formed by a mesh of about 70 μm, and is fed to the suction port 1.
5 into the pump body 12, and a large amount of it is attracted to the magnets etc. that constitute the stator of the motor section 13. Then, this iron powder 20 is
When passing through the pump section 4, the turbine (not shown) of the pump section 14 made of phenol resin or the like is worn out, causing problems such as a reduction in the discharge flow rate. Note that the mesh of the filter 17 is smaller than the iron powder 20, for example, 30 μm.
Assuming the following, the iron powder 20 causes the filter 17 to
will cause clogging, making it difficult to suck in the fuel F itself.

The present invention was developed in view of the problems of the prior art described above.The present invention prevents iron powder in the fuel tank from entering the pump body and causing wear to the turbine of the pump, thereby reducing the flow rate. The present invention provides a fuel pump that can eliminate such problems.

[Means for solving problems]

The feature of the configuration adopted by the present invention in order to solve the above-mentioned problems is that a plurality of enlarged diameter parts are provided in the middle of the suction pipe, spaced apart in the length direction of the suction pipe, and inside each of the enlarged diameter parts. The present invention is characterized in that ring-shaped magnets are respectively provided to allow fuel to flow within the suction pipes, and an annular recess is formed on the inner peripheral side of each magnet.

[Effect]

With the above configuration, when iron powder in the fuel tank is sucked into the suction pipe together with the fuel through the filter, these iron powders can be captured in the annular recess of each ring-shaped magnet in multiple stages, It is possible to prevent the captured iron powder from flowing out of each annular recess, and also to prevent the flow path area of the suction pipe from being reduced by the iron powder.

〔Example〕

An embodiment of the present invention will be described below with reference to FIG. In addition, in the example, the same reference numerals are attached to the same components as in the prior art shown in FIG.
The explanation thereof will be omitted.

In the figure, reference numeral 21 denotes a filter formed in a substantially rectangular box shape, and the filter 21 is similar to the filter 17 described in the prior art, for example, meshes 21A, 21A, . It is designed to prevent foreign matter having a particle size of 70 μm or more from flowing into the pump body 12. A substantially L-shaped connecting pipe 22 is integrally attached to the filter 21, and the connecting pipe 22 connects the filter 21 to the distal end side of a suction pipe 23, which will be described later.

Reference numeral 23 indicates a suction pipe whose base end is connected to the suction port 15 and whose distal end is connected to the filter 21 via the connecting pipe 22. The suction pipe 23 is formed in a substantially L-shape and is connected to the suction port 15. , a short pipe portion 23A extending downward from the suction port 15, and the short pipe portion 2
It is generally composed of a long tube portion 23B extending horizontally in the figure from the lower end of the tube 3A and having a connecting tube 22 fitted to the distal end thereof. In the middle of the long tube portion 23B, for example, three enlarged diameter portions 23C, 23D, 2
3E are formed at a predetermined distance apart, and the enlarged diameter portion 23
A tapered portion 23C1 is formed on one side of C. The tapered portion _23C1 gradually decreases in diameter toward the distal end side of the long tube portion 23B.
Further, a covered cylindrical protrusion 23F having a predetermined depth and protruding in the radial direction of the short tube portion 23A is integrally formed on the proximal end side of the long tube portion 23B.

24, 24, ... are enlarged diameter portions 23C of the suction pipe 23,
23D and 23E are shown. The inner peripheral surface of each magnet 24 is formed to have a diameter corresponding to the inner diameter of the connecting pipe 22, for example, and an annular magnet is provided at an axially intermediate portion thereof. A recessed portion 24A is formed respectively. Each magnet 24 receives the fuel F through the filter 21.
The iron powder 20 sucked together with the iron powder 20 is adsorbed as shown in the figure, and each annular recess 24A absorbs the adsorbed iron powder 20.
This prevents the flow path area within the suction pipe 23 from decreasing. That is, the iron powder 20 adsorbed on the inner peripheral surface side of each magnet 24 is absorbed by the fuel F.
Due to the flow in the direction of arrow B, each annular recess 2 gradually
4A.

Furthermore, 25 indicates another magnet installed in the protrusion 23F of the suction pipe 23, this magnet 25 is located near the intersection of the long pipe part 23B and the short pipe part 23A, and is located in the direction of the arrow B. It is placed directly opposite the flow of water. Then, the magnet 25 collects the iron powder 2 in the fuel F that is not adsorbed by each ring-shaped magnet 24 and flows in the direction of arrow B.
0 collide with the surface of the magnet 25 to prevent the iron powder 20 in the fuel F from being sucked into the short pipe portion 23A together with the fuel F. The magnet 25 and each ring-shaped magnet 24 may be attached to the suction pipe 23 by integral molding or the like.

The fuel pump according to this embodiment has the above-described configuration, and its basic operation is not particularly different from that of the prior art.

However, in this embodiment, enlarged diameter portions 23C, 23D, 2 are provided in the middle of the long tube portion 23B of the suction pipe 23.
Each magnet 24 was attached via the tube 3E, and the magnet 25 was attached via the protrusion 23F near the intersection of the short tube section 23A and the long tube section 23B so as to directly face the flow in the direction of arrow B. The magnets 24 and 25 can reliably adsorb the iron powder 20 sucked into the suction pipe 23 together with the fuel F via the filter 21, and prevent the iron powder 20 from entering the pump body 12. It is possible to prevent the turbine and the like of the pump section 14 from being worn out, and it is possible to solve problems such as a decrease in the discharge flow rate.

Since a tapered part 23C1 is formed on one side of the enlarged diameter part 23C located near the tip side of the long tube part 23B, the magnet ₂₄ attached inside the enlarged diameter part 23C can be attached to one end surface of the magnet 24. , a large amount of iron powder 20 in the fuel F sucked in from the connecting pipe 22 in the direction of arrow B via the filter 21 can be adsorbed. Furthermore, since an annular recess 24A is formed on the inner circumferential side of each magnet 24, each magnet 24 has an annular recess 24A.
The iron powder 20 in the fuel F, which has been adsorbed in multiple stages sequentially along the flow in the direction of the arrow B, on the inner circumferential surface of the fuel F can be captured and deposited in each annular recess 24A by this flow, and once It is possible to prevent the captured iron powder 20 from flowing out from inside each annular recess 24A, and
It is possible to prevent the flow area of the suction pipe 23 from decreasing due to the iron powder 20 captured by each magnet 24,
Fuel F can be smoothly circulated in the direction of arrow B within the suction pipe 23.

Further, since the other magnets 25 are disposed via the protrusions 23F so as to directly face the flow in the direction of the arrow B, each magnet 24 causes the fuel F to be sucked in the direction of the arrow B. Even if the iron powder 20 remains without being adsorbed, the iron powder 20 can be reliably adsorbed by another magnet 25, and is transferred to the pump body 12 through the short pipe portion 23A of the suction pipe 23 and the suction port 15. Iron powder in fuel F sucked into the interior 20
can be made substantially zero.

Further, each magnet 24, 25 is connected to a filter 21.
Since it is provided in the middle of the suction pipe 23 at a relatively distance from each mesh 21A of the filter 21, the iron powder 20 adheres to each mesh 21A of the filter 21 due to the action of the magnetic field from each of the magnets 24 and 25, causing eye damage. It has various effects such as preventing clogging.

In the above embodiment, three ring-shaped magnets 24 are provided in the middle of the long pipe portion 23B of the suction pipe 23, but the number of magnets 24 may be one, two, or four or more. For example, each magnet 24 may be replaced with a cylindrical magnet having a length extending from the enlarged diameter portion 23C to the enlarged diameter portion 23E. In this case, one or more annular recesses may be provided on the inner peripheral side of the cylindrical magnet. Furthermore, other magnets 25 do not necessarily need to be provided.

[Effect of idea]

As detailed above, according to the present invention, ring-shaped magnets are provided in each of the plurality of enlarged diameter portions provided in the middle of the suction pipe, and an annular recess is formed on the inner circumferential side of each magnet. When the iron powder is sucked into the suction pipe together with the fuel through the filter, these iron powders can be captured in the annular recess of each magnet, and the flow path area of the suction pipe is reduced by the iron powder. In addition to preventing the iron powder from decreasing, it is also possible to eliminate problems such as these iron powders entering the pump body and causing wear on the turbine and a decrease in the discharge flow rate.

In addition, since each magnet is placed in the middle of the suction pipe and separated from the filter, problems such as iron powder adhering to the mesh of the filter due to the action of the magnetic field from the magnet and clogging the filter are also eliminated. can.

[Brief explanation of drawings]

FIG. 1 is an enlarged sectional view of a main part of a fuel pump showing an embodiment of the present invention, and FIG. 2 is a vertical sectional view showing a conventional fuel pump installed in a tank. 1...Fuel tank, 11...Fuel pump, 12
... Pump body, 13 ... Motor section, 14 ... Pump section, 15 ... Suction port, 18 ... Discharge port, 20
...Iron powder, 21...Filter, 21A...Mesh, 22...Connecting pipe, 23...Suction pipe, 23
C, 23D, 23E... Expanded diameter portion, 23F... Projection, 24, 25... Magnet, F... Fuel.

Claims (1)

[Scope of utility model registration request] From a pump body installed in a fuel tank, a fuel suction port provided at the lower end of the pump body, and a fuel suction pipe whose base end is connected to the suction port and whose distal end is provided with a filter. In the fuel pump, a plurality of enlarged diameter parts are provided in the middle of the suction pipe at intervals in the length direction of the suction pipe, and a ring is provided in each of the enlarged diameter parts to allow fuel to flow in the suction pipe. What is claimed is: 1. A fuel pump characterized in that magnets each having a shape are provided, and an annular recess is formed on the inner peripheral side of each magnet.