JPH0614071Y2 - Fuel pump unit - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a fuel pump unit and has a new configuration.

(Prior Art) Some conventional fuel pump units have no fuel at the bottom of the sub-tank and are provided with a check valve that opens when fuel is replenished to the fuel tank. The configuration is different from the present invention.

(Problems to be Solved by the Present Invention) The present invention aims to improve the structure of a conventional fuel pump unit, and is an object of the present invention.

(Means for Solving the Problems) The present invention is in accordance with the above-mentioned problems, and includes the first bottom wall 5
Is provided close to the bottom surface of the fuel tank 1, and the fuel pump 9 and the return tube 11 are arranged above the first bottom wall 5 of the sub tank 4, and the pump suction of the fuel pump 9 is performed. The return tube 11 is inserted into the jet pump portion 14 in which the pipe 19 is projected to the fuel filling portion 6 on the first bottom wall 5 and the fuel suction pipe 15 opening on the bottom wall of the fuel tank 1 is passed inside the sub tank 4. The branch pipe 16 of the fuel suction pipe 15 is projected to the fuel filling portion 6, and the branch pipe 16 is opened by the fuel pressure of the fuel tank 1 when the fuel in the sub-tank 4 is insufficient, so that the fuel can be discharged. A check valve 18 for passing through the filling portion 6 is provided, and the first filter 20 is attached to the pump suction pipe 19 projecting into the fuel filling portion 6 of the fuel pump 9, the fuel suction pipe 15 and the branch pipe. The projecting portion of the 6 into the fuel tank 1 in which according to the full Ewell pump Units - which is characterized by attaching the second filter 21.

A preferred embodiment of the present invention will be described below.

(Embodiment) The attached drawings illustrate an embodiment of the present invention, in which a bracket 3 is fixed to an inner surface of a cover plate 2 provided in an opening of an upper surface of a fuel tank 1, and a sub tank 4 is attached to the bracket 3. The sub tank 4 is provided with a first bottom wall 5, and the bottom wall 5 is in contact with the bottom wall of the fuel tank 1. The sub-tank 4 is provided with a fuel filling portion 6 above the first bottom wall 5, and a second bottom wall 7 having a gap 8 communicating with the fuel filling portion 6 above the first bottom wall 5 is attached to the sub tank 4. A fuel pump 9 is mounted on the bottom wall 7, a delivery pipe 10 on the discharge side of the pump is passed through the cover plate 2 to project upward, and a return tube 11 is passed through the cover plate 2 to project into the sub tank 4.

The sub tank 4 may be fixed to the bottom wall of the fuel tank 1 without being suspended from the bracket 3.

Reference numeral 15 denotes a fuel suction pipe vertically provided outside the sub-tank 4 by utilizing a part of the sub-tank 4, the lower end of which is opened to the bottom wall of the fuel tank 1. Head 12 above the suction pipe
Through the sub-tank 4, and the return fuel injection beak 13 formed at the lower end of the return tube 11 is attached to the head 1
2 to form a jet pump portion 14. The head 12 has a bench-yury structure, and when the return fuel is ejected from the return fuel ejection beak 13, a jet pump action for sucking the fuel in the fuel tank 1 from the fuel suction pipe 15 to the sub tank 4 is generated.

The fuel suction pipe 15 has a branch pipe 1 protruding into the fuel filling portion 6.
6 is provided in the bottom portion of the suction pipe 15, and a branch pipe 16 thereof is provided.
A check valve 18 that opens and closes the valve port 17 is attached to the valve so as to project into the fuel filling section 6. The branch pipe 16 is the fuel suction pipe 15
The common inlet is provided on the bottom wall of the sub tank 4.

Attach the first filter 20 to the pump suction pipe 19,
A second filter 21, which is in contact with the bottom wall of the fuel tank 1 as shown in the figure, is attached to a common inlet of the fuel suction pipe 15 and the branch pipe 16 which opens into the fuel tank 1.

(Operation) In the present invention, when the fuel tank 1 is filled with fuel when the vehicle is a new vehicle, it enters the branch pipe 16, opens the check valve 18 by the fuel pressure, and flows into the fuel filling portion 6 from the valve port 17. , Supplying the fuel to the pump suction pipe 19,
After the engine and the fuel pump 9 are started, the fuel returning to the return tube 11 is caused to flow from the return fuel injection beak 13 to the jet pump portion 14 and the pump portion 14 is driven. Will suck up.

(Effect) Since dust may be mixed in the liquid fuel supplied to the fuel tank, and the check valve is provided on the bottom wall of the sub tank (corresponding to the first bottom wall 5 of the present invention), The dust adheres to the valve and the valve cannot be closed. With the check valve kept open, the fuel mixed with the dust is stored in the sub tank 4
However, the present invention is not limited to the check valve 1
8 is provided in the branch pipe 16 of the fuel suction pipe 15 to provide the fuel filling portion 6
And a second filter 21 is provided at a common inlet of the fuel suction pipe 15 and the branch pipe 16,
Since the fuel passed by the second filter 21 is also passed through the jet pump section 14, it has an effect of preventing the fuel containing dust from entering the sub tank together with the first filter 20.

[Brief description of drawings]

 The accompanying drawings are vertical side views illustrating the present invention. 1 ... Fuel tank, 2 ... Lid plate 4 ... Sub tank, 5 ... First bottom wall 6 ... Fuel filling section, 7 ... Second bottom wall, 8 ... Gap 9 ... Fuel pump 11 ... … Return tube 13 …… Return fuel injection beak 14 …… Jet pump part, 15 …… Fuel suction pipe 16 …… Branch pipe, 18 …… Check valve 19 …… Pump suction pipe, 20 …… First filter 21 …… No. 2 filters

Claims (1)

[Scope of utility model registration request] 1. A sub-tank 4 in which a first bottom wall 5 is arranged close to the bottom surface of a fuel tank 1 is provided, and a fuel pump 9 and a return tube 11 are provided above the first bottom wall 5 of the sub-tank 4. The fuel suction pipe 19 of the fuel pump 9 is arranged so as to project into the fuel filling portion 6 on the first bottom wall 5 and the fuel suction pipe 15 that opens on the bottom wall of the fuel tank 1 is connected to the sub-tank 4.
The return tube 11 is inserted into the jet pump portion 14 which is passed through the inside of the sub-tank 4. The branch pipe 16 of the fuel suction pipe 15 is projected into the fuel filling portion 6, and the branch pipe 16 is deficient in fuel inside the sub-tank 4. A check valve 18 for opening the fuel through the filling portion 6 to open the fuel by the fuel pressure of the fuel tank 1 is sometimes provided, and the pump suction pipe 19 protruding to the fuel filling portion 6 of the fuel pump 9 is provided with the first filter 20. And a second filter 21 attached to the projecting portions of the fuel suction pipe 15 and the branch pipe 16 into the fuel tank 1.