Pump device for building up pressure in a fuel tank

Patent metadata

Field	Value
Publication number	US-10267268-B2
Application number	US-201715823203-A
Country	US
Kind code	B2
Filing date	Nov 27, 2017
Priority date	Dec 5, 2016
Publication date	Apr 23, 2019
Grant date	Apr 23, 2019

Abstract

A pump device includes an electrical delivery pump, a first port for an air filter, a second port for a fuel tank, a valve opening, a connecting line, a bypass line, and an electrical switching valve. The connecting line connects the ports via the valve opening, which has a valve seat formed at the opening, a valve body receptacle, and a valve body configured to interact with the seat and adjustable in a direction of the seat by a delivery flow of the delivery pump. The bypass line branches off from the connecting line upstream of the opening, and has a throttled bypass outlet opening into the connecting line downstream of the opening. The switching valve has an electrical actuator, for example a magnet coil, operable to move the body. Such a pump device requires less structural space and reduced production costs relative to conventional pump devices.

First claim

What is claimed is:

1. A pump device for building up pressure in a fuel tank, comprising:
a first port configured to connect to an atmosphere;
a second port configured to connect to a fuel tank;
a first valve opening including:
a valve body receptacle;
a valve body movably positioned in the valve body receptacle; and
a first valve seat configured to interact with the valve body;

a connecting line that connects the first port to the second port via the first valve opening; and
an electrical delivery pump configured such that a delivery flow of the delivery pump adjusts the valve body in a direction of the first valve seat.

2. The pump device of claim 1 , further comprising:
a control line configured to conduct a pressure of the delivery pump to a surface of the valve body averted from the first valve seat.

3. The pump device of claim 2 , wherein:
the delivery pump further includes an outlet;
the control line connects the outlet to the valve body receptacle.

4. The pump device according to claim 3 , wherein:
the connecting line further includes:
a first section between the first port and the first valve opening; and
a second section between the first valve opening and the second port; and

the control line is a bypass line branching off from the first section of the connecting line and opening into the second section of the connecting line.

5. The pump device according to claim 3 , further comprising:
a stop positioned on the valve body receptacle;
wherein the valve body is movable along a valve axis between the first valve seat and the stop.

6. The pump device according to claim 5 , further comprising:
a spring element configured to act on the valve body in a direction of the stop.

7. The pump device according to claim 6 , wherein the spring element includes a helical spring, a diaphragm, or a corrugated bellows.

8. The pump device of claim 4 , further comprising:
at least one second valve opening configured to control a flow connection between the second section of the connecting line to the bypass line based on a position of the valve body in the valve body receptacle.

9. The pump device according to claim 8 , wherein:
the at least one second valve opening is at least two second valve openings arranged along a valve axis in order of decreasing size in a direction toward an opening direction of the valve body; and
the at least two second valve openings are configured to interact with the valve body receptacle or the valve body.

10. The pump device according to claim 8 , wherein:
the at least one second valve opening consists of a single second valve opening;
the bypass line has a throttle outlet that opens into the second section of the connecting line; and
the throttle outlet is independent of a position of the valve body, and has a narrowed throttle opening.

11. The pump device according to claim 4 , wherein:
the bypass line has an opening; and
a section of the bypass line facing toward the valve body receptacle forms an elastic corrugated bellows having a first end fastened to the valve body and a second end fastened to the opening of the bypass line.

12. The pump device according to claim 11 , further comprising:
a throttle outlet that exclusively connects the bypass line to the second section of the connecting line, and that is independent of a position of the valve body.

13. The pump device according to claim 1 , wherein the valve body includes a piston or a hollow piston.

Assignees

• Bosch Gmbh Robert

Inventors

• Lorenz Marko
• Posselt Andreas
• Gutscher Andreas

Classifications

• B60K15/035

  characterised by venting means · CPC title

• B60K2015/03256

  characterised by special valves, the mounting thereof · CPC title

• B60K15/03519

  Valve arrangements in the vent line · CPC title

• F02M25/0818 Primary

  having means for pressurising the evaporative emission space · CPC title

• B60K15/00 Primary

  Arrangement in connection with fuel supply of combustion engines {or other fuel consuming energy converters, e.g. fuel cells}; Mounting or construction of fuel tanks · CPC title