Patent Application
20140174567
This application claims under 35 U.S.C. §119(a) the benefit of Korean Patent Application No. 10-2012-0153736, filed Dec. 26, 2012, the entire contents of which are incorporated herein by reference.
(a) Technical Field
The present invention relates to a fuel tank for a vehicle using Liquefied Petroleum Gas (LPG) fuel, and more particularly, an LPG bombe valve apparatus that consistently maintains a pressure of an LPG bombe constant.
(b) Background Art
In the LPG vehicle using LPG (Liquefied Petroleum Gas) as fuel in the related art, LPG is vaporized and supplied to the engine. However, sometimes LPI (Liquefied Petroleum Injection) that directly injects LPG fuel in a liquid state under high pressure by means of an injector is used to improve starting during winter. In this case, a fuel pump may loose the ability of suction due to cavitation, when there is an abrupt change in composition of the fuel or temperature or pressure inside the LPG bombe while LPG fuel is being refilled.
As such, a fuel tank has been proposed in which fuel is supplied through both of a liquid-state discharge port formed at the end of a filling pipe and a gas-state discharge port formed at an upper portion of the filling pipe such that the pressure at a gas-state side in an LPG bombe is kept constant, thereby preventing a filling delay due to an increase in pressure at the gas-state side.
However, back pressure is not generated in the movable valve V, when the fuel is discharged in a liquid-state side at the lower portion of the LPG bombe, so back pressure will not be generated when the filling fuel forms a filling channel to the liquid-state side. Therefore, the filling is not cut off appropriately and the ratio of liquid state and gas state is not appropriately distributed. Accordingly, the temperature or pressure of the LPG bombe increases too and the pressure of the LPG bombe excessively increases as well during filling, so it is difficult to refill the fuel under severe conditions during the hot season.
Therefore, it is necessary to develop an LPG bombe valve apparatus that appropriately distributes filling fuel to a liquid state and a gas state so that the pressure of the LPG bombe may not be excessively increased even under diverse environmental conditions.
The description provided above as a related art of the present invention is just for helping understanding the background of the present invention and should not be construed as being included in the related art known by those skilled in the art.
The present invention has been made in an effort to solve the above problems and an object of the present invention is to provide an LPG bombe valve apparatus that appropriately distributes filling fuel to a liquid state and a gas state so that the pressure of the LPG bombe may not be excessively increased even under diverse environmental conditions.
In order to achieve the objects of the present invention, an LPG bombe valve apparatus includes: a valve body disposed in an LPG bombe and having a fuel channel therein for discharging fuel supplied from an LPG line to the LPG bombe; a check valve disposed in the fuel channel, with one end supported by an elastic member to be pressed to close the fuel channel; a cam disposed at the other side of the check valve; a cam rod connecting the cam with the check valve and controlling the opening/closing of the check valve in accordance with rotation of the cam; and a converting mechanism wherein both ends are connected to the cam and a float of the LPG bombe converting vertical motion of the float into rotational motion of the cam.
The fuel channel may be extended to the left and right and bent down at 90 degrees. Additionally, a back pressure generating portion making a stratum with different cross-sectional areas may be formed in the fuel channel. Furthermore, a back pressure generating holder formed around the fuel channel may be disposed within the fuel channel and a gas-state hole may be formed in a side of the back pressure generating holder, so fuel may be injected at a predetermined ratio to a gas-state side of the LPG bombe.
Furthermore, a cam may be formed in a disk shape having a predetermined height with a cut portion formed by cutting a portion of a surface including an arc side, and the cam rod may open/close the check valve by a sliding motion while forming a predetermined displacement when the cam rotates. The portion coming in contact with the cam rod of the cut portion may be made flat.
Finally, the converting mechanism may be implemented by a rack and pinion gear connecting the cam with the float, thereby as the float vertically moves, the cam may rotate.
The above and other features of the present invention will now be described in detail with reference to certain exemplary embodiments thereof illustrated the accompanying drawings which are given hereinbelow by way of illustration only, and thus are not limitative of the present invention, and wherein:
It should be understood that the appended drawings are not necessarily to scale, presenting a somewhat simplified representation of various preferred features illustrative of the basic principles of the invention. The specific design features of the present invention as disclosed herein, including, for example, specific dimensions, orientations, locations, and shapes will be determined in part by the particular intended application and use environment.
In the figures, reference numbers refer to the same or equivalent parts of the present invention throughout the several figures of the drawing.
It is understood that the term “vehicle” or “vehicular” or other similar term as used herein is inclusive of motor vehicles in general such as passenger automobiles including sports utility vehicles (SUV), buses, trucks, various commercial vehicles, watercraft including a variety of boats and ships, aircraft, and the like, and includes hybrid vehicles, electric vehicles, combustion, plug-in hybrid electric vehicles, hydrogen-powered vehicles and other alternative fuel vehicles (e.g. fuels derived from resources other than petroleum).
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the singular forms “a”, “an” and “the” are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms “comprises” and/or “comprising,” when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. As used herein, the term “and/or” includes any and all combinations of one or more of the associated listed items.
An LPG bombe valve apparatus according to exemplary embodiments of the present invention is described hereafter with reference to the accompanying drawings.
As shown in
In general, liquid fuel is injected into an LPG bombe. However, when the liquid fuel is fully transferred to a liquid-state side at the lower portion of the LPG bombe, the pressure of the LPG bombe increases excessively, so the internal pressure of the LPG bombe increases higher than the pressure for filling the fuel under severe conditions in the hot season, and thus fuel filling is not available. Such a problem occurs because back pressure is not generated sufficiently when a back pressure type valve is used for appropriately distributing and filling the fuel to a liquid-state side and a gas-state side in the LPG bombe, so it is difficult to cut off the fuel. Accordingly, the illustrative embodiment of the present inventions rotates the cam 500 to ensure a sufficient amount of back pressure is generated.
Further, in order to appropriately distribute fuel to the liquid-state side and the gas-state side during filling of fuel, it is necessary to keep a constant ratio of the fuel discharged to the liquid-state side and the fuel discharged to the gas-state side, but the ratio may change in accordance with the kinds of vehicles or the environment in which vehicles travel, so it depends on the designers. However, in the LPG bombe valve apparatus according to the exemplary embodiment of the present invention, fuel is distributed with the optimum ratio, 5% to the gas-state side and 95% to the liquid-state side.
The fuel channel 200 extends to the left and right and bends down at 90 degrees in a filling valve body in order to fill the LPG bombe with LPG fuel. A back pressure generating portion 210 is formed in a stratum form with the cross-sectional area decreased and increased at the portion where the fuel channel 200 bent down in order to inject 5% of fuel to the gas-state side, a back pressure generating holder 900 is formed around the fuel channel 200, and a gas-state hole 910 is formed in a side of the back pressure generating holder 900, thereby injecting the fuel to the gas-state side of the LPG bombe. The back pressure generating portion 210 and the back pressure generating holder 900 may be separately or simultaneously disposed and one or more gas-holes 910 may be formed.
The amount of fuel gradually increases during the filling, so the float 700 moves up and the vertical motion of the float 700 rotates the cam 500 through the rack and pinion gear of the converting mechanism 800. When the cam rod 600 is inserted into the cut portion 510 of the cam 500 with full filling of the fuel in the LPG bombe, as the cam 500 rotates, the cam rod 600 slides to the cam 200 by the elastic force of the elastic member 300 and moves the check valve 400 to the cam 200. Since the check valve 400 is formed in a shape that can close the fuel channel by being fitted in the fuel channel, the fuel channel is closed by the check valve and cut off so as not to be filled anymore.
According to the LPG bombe valve apparatus of an exemplary embodiment of the present invention, since the valve opened/closed by a cam is implemented instead of a back pressure valve, it is possible to prevent improper cutting-off of fuel due to poor generation of back pressure in the LPG bombe, improve the performance of distributing fuel to the liquid-state side and the gas-state side such that the fuel is distributed to the liquid-state side and the gas-state side by disposing a back pressure generating portion and a back pressure generating holder in a fuel channel such that the filling fuel is distributed with a predetermined ratio, and overcome the difficulty of refilling fuel due to excessive increase in internal pressure of the LPG bombe during the filling.
The invention has been described in detail with reference to preferred embodiments thereof. However, it will be appreciated by those skilled in the art that changes may be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
| Number | Date | Country | Kind |
|---|---|---|---|
| 10-2012-0153736 | Dec 2012 | KR | national |
