Abstract
A capless ORVR system providing sealing and reducing hydrocarbon outlet and having a wave seal, a primary flapper, and a secondary flapper for preventing outlet of hydrocarbons by means of surrounding the nozzle while the nozzle is being placed, allowing uni-directional flow to continue and preventing backflow when there is pressure in the opposite direction from within, and allowing the fuel to exit through the filler neck by being bent outwards.
Claims
1. A system ensuring sealing and preventing outlet of hydrocarbons in capless gasoline onboard refueling vapor recovery systems, and it is characterized in that; it comprises: a front body guiding the nozzle during fuelling and preventing outlet of excess fuel, a primary flapper allowing opening and closing of the outer nozzle receiver opening by moving together with the cap, at least one first spring allowing the opening and closing movement of said primary flapper during fuelling, at least one lever primary allowing equal distribution of the compression load to all sealing areas via the spherical movement thereof during fuelling, an outer body, a secondary housing connected to said front body and removed from the outer body when there is an impact on the front body, at least one pin fixed on said secondary housing so as to allow movement of said primary flapper around the axis thereof during opening and closing movements, a nozzle guide guiding the nozzle during fuelling, a plunger that allows air intake from outside, by coming to a lower position when the air pressure is reduced, a valve cap that keeps the nozzle piston in the cylinder during movement, a second spring that is compressed or loosened according to the movement of the piston, and a wave seal preventing outlet of hydrocarbons by means of surrounding the nozzle while the nozzle is being placed, allowing uni-directional flow to continue and preventing backflow when there is pressure in the opposite direction from within, and allowing the fuel to exit through the filler neck by being bent outwards.
2. The system according to claim 1, characterized in that; it comprises a primary door-seal connected to said front body so as to close the fuel tank filler neck and ensuring insulation by being positioned between the front body and said primary flapper.
3. The system according to claim 1, characterized in that; it comprises a front seal ensuring sealing between said secondary housing and said outer body.
4. The system according to claim 1, characterized in that it comprises a back seal ensuring sealing between the outer body and the nozzle.
5. The system according to claim 1, characterized in that it comprises a vacuum seal preventing the pressure of the fuel tank from getting outside and providing sealing.
6. The system according to claim 1, characterized in that said wave seal is made of rubber.
7. The system according to claim 1, characterized in that said wave seal has a wavy form.
8. The system according to claim 1, characterized in that it comprises a secondary flapper connected to said outer body and providing sealing by moving in the axis of said pin via said at least one first spring.
9. The system according to claim 1, characterized in that it comprises a secondary door-seal providing sealing through connection with said secondary flapper.
Description
FIGURES FOR BETTER UNDERSTANDING OF THE INVENTION
[0042] FIG. 1, is a demounted view of a preferred embodiment of the capless gasoline onboard refueling vapor recovery system according to the invention.
[0043] FIG. 2, is a mounted view of a preferred embodiment of the capless gasoline onboard refueling vapor recovery system according to the invention.
[0044] FIG. 3, is a three-dimensional front view of a preferred embodiment of the capless gasoline onboard refueling vapor recovery system according to the invention.
[0045] FIG. 4, is a side section view of a preferred embodiment of the capless gasoline onboard refueling vapor recovery system according to the invention.
[0046] FIG. 5, is a side perspective view of a preferred embodiment of the capless gasoline onboard refueling vapor recovery system according to the invention.
[0047] FIG. 6, is a hydrocarbon outer view of of a preferred embodiment of the capless gasoline onboard refueling vapor recovery system according to the invention.
[0048] FIG. 7, is top section view of a preferred embodiment of the capless gasoline onboard refueling vapor recovery system according to the invention.
DESCRIPTION OF PARTS REFERENCES
[0049] 1. Front body
[0050] 2. Primary door-seal
[0051] 3. Primary flapper
[0052] 4. Lever primary
[0053] 5. Spring-1
[0054] 6. Secondary housing
[0055] 7. Pin
[0056] 8. Front seal
[0057] 9. Nozzle guide
[0058] 10. Secondary flapper
[0059] 11. Wave seal
[0060] 12. Outer body
[0061] 13. Back seal
[0062] 14. Vacuum seal
[0063] 15. Valve cap
[0064] 16. Spring-2
[0065] 17. Plunger
[0066] 18. Secondary door-seal
[0067] Drawings do not have to be scaled and details not necessary for understanding the present invention may be neglected. Moreover, components which are at least widely equal or which have at least widely equal functions are shown with the same number.
DETAILED DESCRIPTION OF THE INVENTION
[0068] In this detailed description, the preferred embodiments of the capless ORVR system according to the present invention, will only be disclosed for better understanding of the subject.
[0069] As can be seen in FIG. 1, the invention is a system ensuring sealing and preventing outlet of hydrocarbons in capless gasoline onboard refueling vapor recovery systems, and it is characterized in that; it comprises: [0070] a front body (1) guiding the nozzle during fuelling and preventing outlet of excess fuel, [0071] a primary flapper (3) allowing opening and closing of the outer nozzle receiver opening by moving together with the cap, [0072] a primary door-seal connected to the front body so as to close the fuel tank filler neck and ensuring insulation by being positioned between the front body and the primary flapper, [0073] at least one spring-1 (5) allowing the opening and closing movement of the primary flapper (3) during fuelling, [0074] at least one lever primary (4) allowing equal distribution of the compression load to all sealing areas via the spherical movement thereof during fuelling, [0075] an outer body (12), [0076] a secondary housing (6) connected to the front body (1) and removed from the outer body (12) when the front body (1) receives an impact, [0077] at least one pin (7) fixed on the secondary housing (6) so as to allow movement of the primary flapper (3) around the axis thereof during opening and closing movements, [0078] a nozzle guide (9) guiding the nozzle during fuelling, [0079] a piston (17) that allows air intake from outside, by coming to a lower position when the air pressure is reduced, [0080] a valve cap (15) that keeps the nozzle piston (17) in the cylinder during movement, [0081] spring-2 (16) that is compressed or loosened according to the movement of the piston (17), [0082] a secondary flapper (10) connected to the outer body (12) and providing sealing by moving in the axis of the pin (7) via spring-1 (5), [0083] a secondary door-seal (18) providing sealing through connection with the secondary flapper (10), [0084] a wave seal (11) [0085] preventing outlet of hydrocarbons by means of surrounding the nozzle while the nozzle is being placed, [0086] allowing uni-directional flow to continue and preventing backflow when there is pressure in the opposite direction from within, [0087] allowing the fuel to exit through the filler neck by being bent outwards.
[0088] The components shown in FIG. 1 and found in the demounted state of the invention and their functions are as follows: [0089] Front body (1) is an appearance body which guide nozzle while refueling. Front body (1) has evacuation feature is available which allows excess fuel to go outside. [0090] Primary door-seal (2) was typically used to close the open end of a fuel tank filler neck. The fuel cap is attached to the front body (1) so that forms a seal between the fuel cap primary door-seal (2) and the front body (1). Thus, the fuel cap closes the open end of the front body (1) to block discharge of liquid fuel and fuel vapor from the fuel tank through the front body (1). [0091] Primary flapper (3) is an appearance door mounted for movement relative to cover to open and close outer nozzle-receiving aperture. If the diameter of the object is larger than the correct diameter, the object will touch the latches so the flapper door will be released. But the diameter of the hole of the outer body (12) only allows the insertion of correct nozzles, that is, the diameter of the hole will be 22 mm for petrol cars and 26 mm for diesel ones. So larger objects could not be inserted. [0092] Lever primary (4) will rotate to certain angle after that it will oscillate according condition. Spherical movement of lever primary (4) will distribute the compression load equally to all around sealing area. This will improve the sealing performance and avoid leakage issues due to dual pivot-flapper needs smaller rotational angle for nozzle insertion. So the initial spring 1 (5) compression will be kept higher ve the sealing performance will be improved significantly. [0093] Metallic spring 1 (5) drive primary flapper (3). Primary flapper (3) is connect with spring 1 (5) to ensure sealing while opening and closing conditions of primary flapper (3) when nozzle is inserted during refueling. [0094] The secondary housing (6) includes a portion that remains coupled to front body (1). When front body (1) is blowed/hit, front body (1) and secondary housing (6) will separates from the outer body (12) at break away condition. [0095] Pin (7) is fixed in secondary housing (6). Primary flapper (3) is rotated axially about the axis of pin (7) during opening and closing conditions. [0096] Front seal (8) acts as leak proof between secondary housing (6) and outer body (12). [0097] Nozzle guide (9) will guide the gun while refueling. [0098] Secondary flapper (10), is an appearance door as primary flapper (3). [0099] Outer body (12) is coupled with secondary housing (6) by snaps feature which help in breakaway test. Secondary flapper (10) is also connected to outer body (12) for better leak protection. [0100] Back seal (13) will act as leak proof between outer body (12) and filler pipe. [0101] Vacuum seal (14) acts as leak proof which stop escaping tank pressure to outside. [0102] Valve cap (15) will hold plunger (17) assay during its motion condition. [0103] Spring-2 (16) compress according to movement to plunger (17). [0104] Plunger (17) comes down to take air from outside to ORVR system when pressure of the air decreases. [0105] Wave seal (11) consists three functions for capless ORVR system: [0106] 1. Insulation of nozzle outer surface: While the nozzle is being placed, the wave seal (11) surrounds the nozzle before the secondary flapper (10) is opened and thus prevents hydrocarbons from escaping into the atmosphere. Due to its wavy structure, the wave seal (11) is easily opened without any tension or squeezing on the insertion hole shape. The rubber with wavy structure does not have to be expanded. In this way, expansion and compression pressure is not encountered. [0107] 2. Air discharge diaphragm valve: If the fuel filling rate is high, negative pressure builds up in the filler neck due to the venturi effect of the liquid flow. Existing vapor coming from the circulation may not be sufficient for protecting the internal pressure. To prevent early closing, additional air, called external air, is needed from the environment. When high negative pressure is present from inside and the cap pressure generates enough force to lift the diaphragm wall from its bed, the air discharge diaphragm valve (wave seal (11)) provides flow in forward direction, which is unidirectional flow in the determined pressure. In this way, the wave seal (11) instantly prevent backflow. In this case, hydrocarbons cannot go out (98% efficiency). [0108] 3. Malfunction nozzle discharge diaphragm valve: Within the filler neck, the malfunction nozzle discharge diaphragm valve opens (bends) outward due to the pressurized pipe._After the malfunction nozzle discharge diaphragm is opened, it generates an opening that allows outlet of the fuel through the filler neck.
