JPS61258991A - In-tank type electrically powered fuel pump - Google Patents

Abstract

PURPOSE:To prevent a pump from being locked because of foreign substances in a motor part going into the fuel flow passage of a lower pump part by setting the opening of a fuel outlet at the side of a motor chamber in the direction at right angles to a pump shaft and having the direction of the opening coincide with the revolutional direction of an armature. CONSTITUTION:A roof 31a which is formed integrally with a partition wall 31 is formed at a fuel outlet 32 and the opening 32a thereof is set in the direction which is at right angles to a pump shaft and in the same direction as the revolution direction of an armature 18. When chips and dust which cannot be removed in the manufacturing process fall onto the upper part of the fuel outlet 32 due to vibration or other reasons in the operating step, the roof 31a will inhibit the chips and dust from going into the fuel outlet 32. Foreign substances mixed in fuel inside a motor chamber 15 is carried along with fuel in the revolutional direction of the armature 18, on account of which the substances cannot invade into the open port 32a which is set in the same direction as the revolutional direction of the armature 18. Such an accident that the pump is locked because of foreign substances caught between the impellers 11 inside the pump chamber 9 can be prevented.

Description

Detailed Description of the Invention (Industrial Application Field) The present invention relates to an in-tank electric fuel pump that is installed in the fuel tank of an automobile or the like and pressure-feeds fuel to the engine. This is related to measures against tribute such as garbage.

<Prior Art> Conventionally, as shown in FIG. 8, an in-tank electric fuel pump 1 of an automobile or the like is installed almost vertically in a fuel tank 2 via a bracket 3. As shown in the longitudinal cross-sectional view of FIG. 9, the schematic structure of an in-tank electric fuel pump (hereinafter referred to as pump) 1 includes a pump section located at the bottom of a cylindrical housing 4, and a pump section located from the center to the top. Consists of a part of the motor. The pump part is divided by a plate-shaped body 5 fitted and fixed to the lower end of the housing 4 and a partition wall 6 that forms a boundary with a part of the motor, and an annular spacer 7, an annular spacer 7, A disc-shaped intermediate plate 8 with a hole in the center and spacers 7 are fitted in layers.

A pump chamber 9 is formed in the center of the pump section, and a shaft 1o fixed to the body 5 is located at the axis of the pump chamber 9.

An impeller 11 is inserted into an annular hollow portion formed by a spacer 7 between the body 5, the intermediate plate 8, and the partition wall 6, and its central portion is rotatably supported by a shaft 10 via a bearing 12. Fuel inlet 13 in body 5
A fuel outlet 14 is provided in the partition wall 6 and communicates with a motor chamber 15.

A portion of the motor is partitioned by a cover 16 fitted and fixed to the upper end of the housing 4 and a partition wall 6 that borders the pump section, and a motor chamber 15 is formed therebetween. A fuel outlet 17 is provided in the center of the cover 16 and extends upward. An armature 18 is arranged at the axial center of the motor chamber 15, and the rotating shafts at both ends of the armature 18 are connected to the partition wall 6. A magnet 19 is attached to the inner periphery of the housing 4 and corresponds to the armature 18. A joint is attached to the lower rotating shaft 18a of the armature 18. 20 is assembled, its pair of claws 20a are inserted into the small axial holes provided in the center of the impeller 11, and the motor is activated.
The impeller 11 rotates and sucks fuel from the fuel intake port 13. The sucked fuel enters the motor chamber 15 through the fuel outlet 14 and is discharged to the outside from the fuel outlet 17 of the cover 16. There is a synthetic resin insulating plate 2 inside the cover 16.
1 is fitted to fix a terminal bolt 22 that protrudes through the cover 16, and a brush 23 is attached to the inside. Brush 23 is electrically connected to terminal bolt 22 and energizes commutator 24 of armature 18 .

Documents related to fuel pumps such as those mentioned above include
There is a publication No. 151397.

(Problems to be Solved by the Invention) However, in the fuel pump 1 as described above, foreign matter that could not be removed even if sufficient foreign matter removal measures were taken during the manufacturing process may be moved due to vibration etc. during the use stage. There is. In this case, foreign matter in the motor chamber 15 , such as cutting chips, solder scum, etc., is transferred from the fuel outlet 14 of the partition wall 6 to the partition wall 6 .
There is a risk that the fuel may fall into the fuel flow path of the pump section composed of the spacer 7 and the intermediate plate 8 and get caught on the blades of the impeller 11, causing the impeller 11 to lock and causing the fuel pump 1 to stop functioning.

SUMMARY OF THE INVENTION An object of the present invention is to provide an in-tank electric fuel pump that prevents the pump from locking due to foreign matter entering the fuel flow path of the pump section located below the motor.

(Means for Solving the Problems) The present invention provides an in-tank electric fuel pump in which a motor chamber is disposed above the pump chamber via a partition wall, and a fuel outlet is provided in the partition wall to communicate the two chambers. The in-tank electric fuel pump is characterized in that the motor room side opening of the fuel outlet is oriented perpendicularly to the pump shaft and aligned with the rotational direction of the armature.

(Function) In the above-mentioned in-tank electric fuel pump, when foreign matter in the motor chamber falls through the fuel and reaches the fuel outlet provided in the partition wall at the boundary with the pump chamber, the opening is aligned with the pump shaft. Since it is oriented at right angles, foreign matter is prevented from entering, and since foreign matter in the fuel in the motor chamber moves along with the fuel in the direction of rotation of the armature, it cannot enter the pump chamber through the opening facing in the same direction.

(Example) The present invention will be described below based on drawings showing examples. FIG. 1 is a longitudinal sectional view of the embodiment, and the same components as in the prior art are given the same numbers as in FIG. 9, and their explanation will be omitted. The fuel outlet 32 provided in the bulkhead 31 of the pump section according to the present invention has a configuration as shown in FIGS. 2 and 3. That is, the fuel outlet 32 is provided with a roof 31a that is integrally formed with the partition wall 31. The opening 32a is oriented perpendicularly to the axial direction of the pump, in the same direction as the rotational direction of the armature 18, and is provided at a higher position than the upper surface 31b of the partition wall 31.

In the fuel pump configured as described above, chips, dirt, etc. in the motor chamber 15 that could not be removed during the manufacturing process are
When the fuel outlet 32 moves due to vibration or the like during use and falls above the fuel outlet 32, it is blocked by the roof 31a and the fuel outlet 3
2 cannot be penetrated. Also motor room 1
Since the foreign matter in the fuel of No. 5 moves in the direction of rotation of the armature 18 together with the fuel, it enters through the opening 32a facing in the same direction as the rotation direction. Even if the pump moves, the opening 32a is located at a higher position than the top surface 31b of the partition, so they cannot enter inside.This prevents foreign objects from getting caught in the impeller 11 of the pump chamber 9 and causing the pump to lock. Ru.

4 and 5 show a second embodiment. This is bulkhead 3
A nozzle 33 is attached to the upper end of one fuel outlet 32. The nozzle 33 is a synthetic resin mesh equivalent to 250 meshes, is integrally molded with the aggregate 34, and is fixed to the partition wall 31. The material of the nozzle 33 may be made of wire mesh.

Nozzle opening 33Q is oriented in the same direction as the direction of rotation of armature 18. Since the nozzle 33 is made of mesh, the fuel can pass through it freely, and the opening 33a is not necessary for the fuel outlet function, but the opening 33a is necessary in order to let out foreign matter outside if there is a foreign object in the pump chamber 9. It is. In this way, foreign matter in the motor chamber 15 is prevented from entering the pump chamber by the mesh of the nozzle 33, and is also prevented from entering the fuel outlet 32 through the opening 33a.

6 and 7 show a third embodiment. This is bulkhead 3
A valve 35 made of a flexible flat plate made of rubber, spring steel, synthetic resin, etc. is attached to the upper end of the fuel outlet 32 of the first fuel outlet 32, and a stopper 36
It is also fixed with a bottle 37. When the valve 35 is open, the opening 35a is oriented in the same direction as the direction of rotation of the armature 18. The fuel sucked up by pumping pushes open the valve 35 and flows into the motor chamber 15. When the armadure 18 stops rotating, the valve 35 opens the fuel outlet 3.
Block 2. This prevents foreign matter in the motor chamber 15 from entering the pump chamber 9 through the fuel outlet 32.

(Effects of the Invention) As explained above, the present invention provides an in-tank electric fuel pump in which a motor chamber is disposed on the side of a pump chamber through a partition, and a fuel outlet is provided in the partition wall to communicate both chambers. The opening of the fuel outlet on the motor chamber side is oriented perpendicularly to the pump shaft and aligned with the direction of rotation of the armature, thereby preventing foreign objects from the motor chamber from entering the fuel flow path of the pump chamber located below. This has the effect of preventing pump lock caused by

[Brief explanation of the drawing]

1 to 7 show embodiments of the present invention, FIG. 1 is a longitudinal sectional view, FIG. 2 is a sectional view taken along line II-It in FIG. 1, and FIG. 3 is a sectional view taken along line II-It in FIG. 4 to 7 are cross-sectional views of the second and third embodiments similar to the first embodiment, and their V-v and ■-VI line sectional views; FIG. 8 is the fuel A side view of an in-tank electric fuel pump installed in a tank, and FIG. 9 is a longitudinal sectional view of a conventional in-tank electric fuel pump. 9... Pump chamber 15... Motor chamber 18... Armature 31... Bulkhead 32... Fuel outlet

Claims (1)

[Claims] An in-tank electric fuel pump in which a motor chamber is disposed above the pump chamber via a partition wall, and a fuel outlet is provided in the partition wall to communicate both chambers, and the motor room side opening of the fuel outlet is connected to the pump shaft. An in-tank electric fuel pump characterized in that it is oriented perpendicularly to the armature and coincides with the direction of rotation of the armature.