UREA FILLER NECK AND UREA TANK FOR PREVENTION OF UREA OVERFLOW AND UREA AFTER-TREATMENT SYSTEM WITH OUTSIDE FILLER NECK

• US 20160003122A1
• Filed: 12/03/2014
• Published: 01/07/2016
• Est. Priority Date: 07/07/2014
• Status: Active Grant

• Current Assignee: Hyundai Motor Company (Hyundai Motor Group), korea fuel-tech corporation
• Original Assignee: Hyundai Motor Company (Hyundai Motor Group), korea fuel-tech corporation
• Inventors: HAM, Chang-Ho, CHOI, Pil-Seon, RYOO, Dong-Myoung, LIM, Young-Jae, CHAE, Myung-Keun
• Granted Patent: US 9,644,518 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: B60K 13/04 concerning exhaust collecting exhaust gases with central suction systems not forming part of vehicles, e.g. in workshops or tunnels B08B15/002, otherwise along carriageways E01C1/005; extensions for melting snow on roads E01H5/00, E01H6/00; exhaust or silencing apparatus for internal combustion engines per se F01N; pipes, joints or supports therefor F16L
• CPC Class Codes: B60K 15/03 Fuel tanks chassis frame comprising fluid storage compartment B62D21/16 ; Details of the fuel feeding system related to the fuel tank F02M37/0076
• CPC Class Codes: B67D 7/0294 Combined with valves
• CPC Class Codes: B67D 7/362 combined with over-fill preventing means indicating or measuring liquid level G01F23/00; level control G05D9/00
• CPC Class Codes: B67D 7/42 Filling nozzles
• CPC Class Codes: F01N 3/2066 Selective catalytic reduction [SCR]
• CPC Class Codes: F01N 3/2896 Liquid catalyst carrier

Abstract

A urea filler neck for preventing a urea overflow includes a filler housing forming a urea path in which urea flows to a urea tank. An injection gun guide is provided in the filler housing. An end of an injection gun is fixed by the injection gun guide to limit an insertion position of the injection gun inserted into an inlet of the filler housing. An injection gun guide flooding phenomenon is generated, in which urea flowing backward from the urea tank rises to block an air flow in the filler housing being generated in the injection gun guide. A filler housing pressure increasing phenomenon is generated, in which a pressure in the filler housing is increased due to blocking of the air flow by the injection gun guide flooding phenomenon being generated in the injection gun guide.

Claims

1. A urea filler neck for preventing a urea overflow, comprising:

a filler housing forming a urea path in which injected urea flows to a urea tank; and

an injection gun guide provided in the filler housing, an end of an injection gun fixed by the injection gun guide to limit an insertion position of the injection gun inserted into an inlet of the filler housing,

wherein an injection gun guide flooding phenomenon is generated, in which urea flowing backward from the urea tank rises to block an air flow in the filler housing being generated in the injection gun guide,

a filler housing pressure increasing phenomenon is generated, in which a pressure in the filler housing is increased due to blocking of the air flow by the injection gun guide flooding phenomenon being generated in the injection gun guide,

the injection gun is shut-off by detecting the pressure in the filler housing pressure increasing phenomenon in the injection gun guide, and

the area overflow flowing backward is delayed by a back flow buffering phenomenon in which the urea flowing backward is stored in an inner space of the filler housing in the injection gun guide.

2. The urea filler neck of claim 1, wherein the injection gun guide comprises:

a urea buffer portion which comes into close contact with an inner peripheral of a housing body of the filler housing and is formed with a generation space of the back flow buffering phenomenon; and

a urea injection port spaced apart from a connection section in which a diameter of the housing body is reduced to a diameter of a housing extension portion such that the housing extension portion connected to the housing body has a changing section, and thus a generation space of the filler housing pressure increasing phenomenon by the injection gun guide flooding phenomenon is formed in the urea injection port and the end of the injection gun is fixed by the urea injection port.

3. The urea filler neck of claim 2, wherein the housing extension portion is connected with a urea injection pipe connected to the urea tank.

4. The urea filler neck of claim 2, wherein a side venting line having a hollow pipe shape is connected to a space formed between an outer peripheral portion of the urea injection port and the inner peripheral portion of the housing body, and the side venting line is connected with a leveling pipe connected to the urea tank.

5. The urea filler neck of claim 2, wherein the housing body further comprises a seal block which comes into close contact with an inner peripheral portion of the housing body to pass through the injection gun, and the seal block is disposed above the injection gun guide to seal an inlet of the housing body.

6. The urea filler neck of claim 5, wherein the seal block comprises a magnetic ring and a magnet holder into which the magnetic ring is fitted in the vicinity of the injection gun, and an outer peripheral portion of the magnet holder comes into close contact with the inner peripheral portion of the housing body.

7. The urea filler neck of claim 5, wherein the injection gun passes above the seal block through the urea injection port which is fitted and coupled to the housing body.

8. The urea filler neck of claim 7, wherein the urea injection port is pulled by a magnetic force of a magnetic ring inserted into a magnet holder of the seal block.

9. The urea filler neck of claim 7, wherein the housing body further comprises a mounting flange to which the urea injection port is fitted and coupled, and the mounting flange has a drilled mounting hole.

10. A urea tank for prevention of a urea overflow, comprising:

a urea filler neck having an injection gun guide provided in a filler housing through which urea is discharged to a urea tank body forming a storage space of the urea;

an injection gun inserted into an inlet of the filler housing being shut-off due to a pressure increase in the filler housing by the urea flowing backward during injection of the urea in the injection gun guide, in which an overflow of the urea flowing backward is discharged to the inlet of the filler housing being delayed by storing the urea flowing backward in an inner space of the filler housing in the injection gun guide;

a urea injection pipe connected to an outlet of the filler housing, the urea discharged to the outlet flowing to the urea tank body through the urea injection pipe by gravity;

a leveling pipe for maintaining an air flow before blocking by the urea flowing backward such that the inner space of the filler housing communicates with an inner space of the urea tank body;

a check valve provided at an outlet portion of the urea injection pipe; and

a membrane valve for regulating a ventilation rate at the urea tank body.

11. The urea tank of claim 10, wherein the leveling pipe is connected to a side venting line drawn from the filler housing,

the side venting line is drawn from a urea injection port of the injection gun guide by which an end of the injection gun is fixed and the inner space formed by the filler housing, and

the urea tank body comprises an injection connector for connecting the urea injection pipe and a venting connector for connecting the leveling pipe.

12. A urea after-treatment system having an outside filler neck, comprising:

a urea filler neck coupled to an outside injection port door exposure to outside of a vehicle, urea being injected by opening the outside injection port door;

a urea tank comprising a urea injection pipe connected to an outlet of the urea filler neck to guide the urea injected into a urea tank body for storing the urea, and a leveling pipe connecting the urea filler neck to the urea tank body to form an air flow by which an inner space of the urea filler neck communicates with the atmosphere;

a urea injector for injecting the urea into an exhaust pipe; and

a selective catalytic reduction for removing NOx in exhaust gas.

13. The urea after-treatment system of claim 12, wherein the urea filler neck comprises:

a filler housing forming a urea path in which injected urea flows to a urea tank;

a urea injection port spaced apart from a connection section in which a diameter of a housing body of the filler housing is reduced to a diameter of a housing extension portion such that the housing extension portion connected to the housing body has a changing section;

a seal block which comes into close contact with an inner peripheral portion of the housing body to pass through an injection gun;

an injection gun guide provided in the filler housing, an end of the injection gun fixed by the injection gun guide to limit an insertion position of the injection gun inserted into an inlet of the filler housing; and

the side venting line having a hollow pipe shape and connected to a space formed between an outer peripheral portion of the urea injection port and the inner peripheral portion of the housing body.

14. The urea after-treatment system of claim 12, wherein the urea tank comprises a check valve provided at an outlet portion of the urea injection pipe, a membrane valve for regulation of a ventilation rate at the urea tank body, a urea detection sensor which detects an amount of the stored urea, and a urea pump which pumps and supplies the stored urea to the urea injector.