JPH051647Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a submerged fuel pump suitable for use in pressure-feeding fuel in a fuel tank to, for example, an automobile engine. The present invention relates to a submerged fuel pump having a vapor discharge pipe that discharges vapor (vaporized fuel gas) onto the liquid level in a fuel tank.

[Conventional technology]

FIG. 4 shows a conventional submerged fuel pump.

In the figure, 1 indicates a fuel tank containing fuel 2. The fuel tank 1 consists of a lower case 1A and an upper case 1B, and the upper end of the upper case 1B has a mounting hole 1C for a fuel pump 4, which will be described later. is drilled. 3 shows a mounting cover that covers the mounting hole 1C of the fuel tank 1, and the mounting cover 3 is provided with brackets 3A and 3B located on the lower surface side, and the brackets 3A and 3B are connected through the mounting hole 1C. and is suspended into the fuel tank 1.

Reference numeral 4 indicates a fuel pump installed in the fuel tank 1 via a bracket 3A.
The pump body 7 includes a built-in motor part 5 and a pump part 6, and has a suction port 7A and a discharge port 7B for the fuel 2 on both upper and lower ends, and a suction pipe 8 in the suction port 7A of the pump body 7. connected via the pump body 7
A suction filter 9 that sucks the fuel 2 in the fuel tank 1 into the pump body 7 by rotating the pump part 6 with the motor part 5 inside, a paper extraction pipe 11 to be described later, and a discharge port 7B of the pump body 7. A discharge pipe 10 is connected to the pump body 7 and discharges the fuel 2 sucked into the pump body 7 to the outside of the fuel tank 1.
The discharge pipe 10 is connected to an injection valve (none of which is shown) on the engine side via an external fuel pipe.

Reference numeral 11 indicates a vapor removal hose as a vapor discharge pipe whose base end is connected to the upper end of the suction filter 9 and whose distal end extends above the liquid surface of the fuel 2. The hose 11 is a long and thin flexible hose. The distal end thereof is attached to the bracket 3B via an attachment member 12. Here, the hose 1
1 is by directing the vapor of the fuel 2 accumulated in the suction filter 9 onto the liquid surface of the fuel 2,
This vapor is prevented from being sucked together with the fuel 2 from the suction filter 9 into the pump body 7 via the suction pipe 8 and the like.

In the conventional technology configured as described above, when the pump part 6 is rotated by the motor part 5 in the pump body 7, the fuel 2 in the fuel tank 1 is transferred from the suction filter 9 to the pump body via the suction pipe 8, etc. 7 and is discharged from the discharge pipe 10 toward an external injection valve or the like. At this time, if vapor is supplied to the injection valve together with the fuel 2, the injected fuel becomes diluted, causing engine stalling and the like. Therefore, the suction filter 9 is provided with a vapor removal hose 11 to discharge the paper in the suction filter 9 when the fuel pump 4 is stopped, and when the fuel pump 4 is activated, this vapor is sucked into the pump body 7. I try to prevent it from happening.

[The problem that the idea aims to solve]

By the way, in the above-mentioned conventional technology, the distal end side of the vapor removal hose 11 is simply supported by the bracket 3B via the mounting member 12, and the distal end is opened above the liquid level of the fuel 2. Foreign objects 13, 13, etc., such as dust floating on the liquid surface, are shaken by the liquid surface due to vibrations when driving on rough roads, etc.
From the opening at the end of the vapor removal hose 1,
If this foreign material 13 is sucked into the pump body 7 along with the fuel 2 from the suction filter 9, the pump section 6 etc. may be damaged, causing a problem with the fuel pump 4 malfunctioning. .

In addition, in order to solve the above problem, it is being considered to separately provide a filter to prevent foreign matter from entering at the tip of the vapor removal hose 11, but in this case, the filter would be expensive and it would be difficult to assemble the filter. There is a problem that it is troublesome and the workability is poor.

The present invention was developed in view of the problems of the prior art described above.The present invention not only prevents foreign objects floating on the fuel surface from entering the vapor discharge pipe, but also improves work efficiency such as assembly. An object of the present invention is to provide a submerged fuel pump that can be improved and reduce costs.

[Means to solve the problem]

A feature of the configuration adopted by the present invention in order to solve the above-mentioned problems is that a soft cap having a small hole for vapor discharge is provided on the tip side of the vapor discharge pipe.

[Effect]

With the above configuration, the vapor in the suction filter can be discharged from the vapor discharge pipe through the small hole in the soft cap, and the soft cap prevents foreign matter floating on the fuel surface from entering the vapor discharge pipe. It becomes possible to regulate.

〔Example〕

Embodiments of the present invention will be described below with reference to FIGS. 1 to 3. In this embodiment, the same components as those of the prior art shown in FIG. 4 described above are given the same reference numerals, and their explanations will be omitted.

In the figure, reference numeral 21 indicates a vapor removal hose as a vapor discharge pipe for discharging the vapor in the suction filter 9 onto the liquid surface of the fuel 2, and the hose 21 is almost the same as the vapor removal hose 11 described in the related art. Although the distal end side is attached to the bracket 3B via the attachment member 12, the hose 2
As shown in FIGS. 2 and 3, an annular locking groove 21A is formed on the outer periphery of the distal end side of the holder 1, located above the mounting member 12. Then, the locking groove 21
A is engaged with a locking portion 22A of a soft cap 22, which will be described later, to prevent the soft cap 22 from coming off.

Reference numeral 22 indicates a soft cap attached to the tip side of the vapor removal hose 21, and the soft cap 22
is molded as shown in the figure using a soft elastic material such as silicone rubber, and is formed into a closed cylindrical shape to fit on the outer peripheral side of the tip of the vapor removal hose 21, and has a lower end that engages with the locking groove 21A of the hose 21. A cap part 22B is provided with a thick-walled locking part 22A, which is erected in a rectangular parallelepiped shape from the upper surface of the cap part 22B,
For example, the height is about 20mm, the width is about 12mm,
The protrusion 22C has a thickness of about 5 mm at the lower end and about 3 mm at the upper end.

Further, a slit hole 23 as a small hole communicating with the interior of the cap portion 22B is formed in the protrusion portion 22C of the soft cap 22 in the height direction, and the slit hole 23 extends in the width direction of the protrusion portion 22C. for example
A long hole portion 23A with a slit width of about 0.5 mm,
A circular hole portion 23B is located in the center of the long hole portion 23A and is formed in a circular shape with a diameter of, for example, about 0.8 mm.
It is made up of. And the soft cap 22
The fuel vapor drawn out from inside the suction filter 9 via the vapor removal hose 21 is removed from the slit hole 23.
At the same time, foreign matter 13 and the like floating on the surface of the fuel 2 are prevented from entering the vapor removal hose 21 through the slit hole 23.

The submerged 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, a soft cap 22 is provided on the tip side of the vapor removal hose 21, and a slit hole 23 as a small hole for vapor discharge is bored in the protrusion 22C of the soft cap 22, so that the suction filter 9 The vapor inside can be discharged from the slit hole 23 of the soft cap 22 onto the liquid surface of the fuel 2, and foreign matter 13 etc. floating on the liquid surface can enter the vapor removal hose 21 due to fluctuations of the liquid surface. can be regulated by the slit hole 23 of the soft cap 22.

In particular, since the soft cap 22 is made of a soft elastic material such as silicone rubber, when the liquid level of the fuel 2 fluctuates greatly due to vibrations of the vehicle when driving on a rough road, the soft cap 22 As shown in FIG. 3, the protrusion 22C is bent by the fluctuation of the liquid level, and the slit hole 23 can be automatically closed. Therefore, even when the foreign objects 13 etc. floating on the liquid surface of the fuel 2 are smaller than the slit holes 23, it is possible to reliably prevent these foreign objects 13 from entering the vapor removal hose 22 through the slit holes 23. .

Furthermore, since the soft cap 22 can be mass-produced using means such as injection molding, it can be formed at low cost, reducing costs. By simply fitting onto the outer circumferential side of the tip end of the hose 21 and locking the locking portion 22A in the locking groove 21A, the hose can be prevented from coming off, resulting in various effects such as greatly improving workability during assembly.

In addition, in the embodiment, the slit hole 23 is formed from the elongated hole portion 23A and the circular hole portion 23B, and the elongated hole portion 2
The width of the slit 3A is approximately 0.5 mm, and the diameter of the circular hole 23B is approximately 0.8 mm.
It may be changed as appropriate depending on the type, etc., and
The circular hole portion 23B may be omitted in some cases.

[Effect of idea]

As detailed above, according to the present invention, since a soft cap having a small hole for vapor discharge is provided on the tip side of the vapor discharge pipe, the vapor led out from the suction filter into the vapor discharge pipe is absorbed into the small of the soft cap. It can be discharged to the outside through the hole, and the soft cap can prevent foreign matter floating on the fuel surface from entering the vapor discharge pipe. In addition, the soft cap can be formed at low cost, reducing costs, and can be easily assembled to the tip side of the vapor discharge pipe, improving work efficiency during assembly.
It has various effects.

[Brief explanation of the drawing]

1 to 3 show embodiments of the present invention,
Fig. 1 is a perspective view of a soft cap, etc., Fig. 2 is a longitudinal cross-sectional view of the soft cap, etc., Fig. 3 is a longitudinal cross-sectional view of the soft cap, etc. showing a state different from Fig. 2, and Fig. 4 shows the conventional technology. FIG. 2 is a longitudinal sectional view of the submerged fuel pump shown in FIG. 1...Fuel tank, 2...Fuel, 3...Mounting cover, 3A, 3B...Bracket, 4...Fuel pump, 5...Motor part, 6...Pump part, 7...
Pump body, 8...Suction pipe, 9...Suction filter, 10...Discharge pipe, 12...Mounting member, 13...
... Foreign matter, 21 ... Vapor removal hose (vapor discharge pipe), 22 ... Soft cap, 23 ... Slit hole (small hole).

Claims (1)

[Scope of utility model registration request] A pump body provided in a fuel tank and having a built-in motor part and a pump part; a suction filter provided at a suction port of the pump body for sucking fuel in the fuel tank into the pump body; and the suction filter. In an oil-submerged fuel pump, the vapor discharge pipe has a proximal end attached to the suction filter and a distal end extending above the liquid surface of the fuel in the fuel tank in order to discharge vapor therein. An oil-submerged fuel pump characterized in that a soft cap having a small hole for vapor discharge is provided on the tip side of the pump.