KR19990026540U - Fuel Supply System of LPI Car - Google Patents

Abstract

The present invention relates to a fuel supply device for an LPG vehicle, comprising a fuel tank (2) storing LPG compressed in a liquid state, and a liquid LPG connected to the fuel tank (2) and discharged from the fuel tank (2). A filter 4 provided to remove mixed impurities, a high pressure regulator 6 for vaporizing liquid LPG from which impurities have been removed by the filter 4, and LPG started to be vaporized by the high pressure regulator 6; The vaporization process of the evaporator 8 is completed, the low pressure regulator 10 to further lower the pressure of the LPG vaporized in the evaporator 8 to completely vaporize, LPG completely vaporized by the low pressure regulator 10 In the fuel supply device of the LPG vehicle in which the mixing valve 12 and the air mixed with the mixture of LPG and air mixed by the mixing valve 12 flows into the combustion chamber of the engine 14, the low pressure Between regulator 10 and mixing valve 12 Separator 30 for filtering the liquid LPG in the furnace is provided, but the inner upper end of the separator 30 is provided with a diaphragm 32 to block the pipeline vertically when the ambient temperature is low, such as in winter Initially, LPG of the liquid phase which is not completely vaporized in the LPG supplied to the combustion chamber of the engine is prevented from being introduced into the combustion chamber, thereby improving startability and fuel economy.

Description

Fuel Supply System of LPI Car

The present invention relates to a fuel supply device for an LPG vehicle, and more particularly, in a fuel supply device for an LPG vehicle using LPG as a fuel, the LPG filter is used to filter liquefied LPG between a low pressure regulator and a mixing valve. The present invention relates to a fuel supply device for an LPG vehicle which can improve fuel efficiency and startability by filtering liquid LPG which is not completely vaporized in an evaporator at the initial start-up or low temperature of the vehicle by providing a separator.

As you know, the internal combustion engine of LPG automobile burns the mixer sucked into the combustion chamber, and the piston reciprocates the piston up and down with the explosive force generated, and converts the linear reciprocation movement into the rotational movement as a crank mechanism to obtain rotational power. For example, engines provided in automobiles are representative.

Such internal combustion engines may include gasoline engines, diesel engines, and LPG engines, for example, depending on the fuel used. The LPG engine is generally used in commercial vehicles.

The LPG engine liquefies and stores LPG fuel in a fuel tank at a predetermined pressure, and then vaporizes the engine during operation of the engine.

That is, LPG fuel is stored in the liquid phase and vaporized in the evaporator. Since the LPG fuel deprives much heat from the surroundings during vaporization, the latent heat of evaporation required for fuel vaporization is circulated by circulating the cooling water heated by the operation of the engine in the middle stage. Will be supplied.

1 is a block diagram schematically illustrating a fuel system diagram of a general LPG vehicle.

As shown, the compressed LPG is stored in a liquid state, and a fuel tank 2 having a pressure reducing valve (not shown) is provided at an upper end thereof.

A filter 4 connected to the fuel tank 2 to remove impurities mixed in the liquid LPG discharged from the fuel tank 2 is provided, and the liquid LPG in which the impurities are removed by the filter 4 is removed. Is supplied to the high pressure regulator (6).

At this time, the high pressure regulator 6 lowers the pressure so that the liquid LPG is vaporized.

As described above, LPG, which begins to be vaporized by the high pressure regulator 6, enters the evaporator 8 after passing through the high pressure regulator 6, and the vaporization process of the LPG is completed in the evaporator 8.

Outside the evaporator (8) is passed through the cooling water circulating the engine 14 to provide the heat of vaporization necessary for the LPG to evaporate in the evaporator (8).

The LPG vaporized in the evaporator 8 passes through the low pressure regulator 10, and the LPG passing through the low pressure regulator 10 is further lowered in pressure to completely vaporize.

In addition, the LPG completely vaporized while passing through the low pressure regulator 10 is introduced into the mixing valve 12 to be mixed with air and supplied to the combustion chamber of the engine 14 to be combusted.

Since LPG flowing into the mixing valve 12 is introduced by the negative pressure generated in the mixing valve 12, the LPG does not flow into the mixing valve 12 when the engine is stopped.

In the fuel supply device of the LPG vehicle, the fuel tank 2 in which the compressed liquid LPG is stored during operation of the engine discharges the liquid LPG at the pressure in the tank.

Then, the liquid LPG is introduced into the high pressure regulator 6 by removing impurities mixed in the LPG while passing through the filter (4).

LPG of the liquid phase introduced into the high pressure regulator (6) begins to vaporize and enters the evaporator (8) to complete the vaporization process of LPG.

The LPG vaporized while passing through the high pressure regulator 6 and the evaporator 8 is introduced into the low pressure regulator 10 and completely vaporized, and the LPG vaporized due to the negative pressure of the mixing valve 12 is mixed with the mixing valve 12. Will flow into.

LPG introduced into the mixing valve 12 is mixed with air in the mixing valve 12 to be introduced into the combustion chamber of the engine 14 to be combusted.

However, the fuel supply device of the conventional LPG vehicle made as described above, the liquid LPG discharged from the fuel tank begins to vaporize through the high pressure regulator, and the vaporization process is completed in the evaporator, and the liquid LPG completely passes through the low pressure regulator. In the initial stage of start-up, when the liquid LPG passes through the evaporator, the temperature of the cooling water passing through the outside of the evaporator is low temperature, so that some of the LPG which is not vaporized due to not being provided with the heat of vaporization necessary for vaporization is transferred to the combustion chamber of the engine in the liquid state. There was a problem in that the startability is lowered.

In addition, when the ambient temperature is low, such as in the winter, when the initial start-up is not able to provide sufficient heat of vaporization necessary for the vaporization of the fuel, there is a problem that the fuel is supplied to the combustion chamber in a state that the fuel is not sufficiently vaporized, the startability is significantly reduced.

The present invention has been made to solve the problems of the prior art as described above, by filtering the LPG in the liquid phase not completely vaporized in the LPG supplied to the combustion chamber of the engine at the beginning of the start when the ambient temperature is low, such as winter An object of the present invention is to provide a fuel supply device for an LPG vehicle which prevents liquid LPG from flowing into a combustion chamber to improve startability and fuel economy.

Technical composition of the present invention for achieving the above object is a filter tank for storing LPG compressed in a liquid state, and a filter connected to the fuel tank to remove impurities mixed in the LPG of the liquid discharged from the fuel tank And a high pressure regulator for vaporizing liquid LPG from which impurities are removed by the filter, an evaporator for completing the vaporization process of LPG started to be vaporized by the high pressure regulator, and further lowering the pressure of the LPG vaporized in the evaporator. The low pressure controller to vaporize, the LPG and air mixing valves are completely mixed by the LPG and the low pressure regulator, LPG and air mixtures mixed by the mixing valve is introduced into the combustion chamber of the engine of the LPG automobile A fuel supply device, comprising: a separator for filtering liquid LPG in a pipeline between the low pressure regulator and the mixing valve. In addition, the inner top of the separator is characterized in that the diaphragm is provided to block the pipeline vertically.

1 is a configuration diagram schematically showing a fuel system diagram of a typical LPG vehicle

Figure 2 is a block diagram showing a fuel system diagram of the LPG vehicle equipped with a separator according to the present invention

Explanation of symbols on the main parts of the drawings

2: fuel tank 4: filter

6: high pressure regulator 8: evaporator

10: low pressure regulator 12: mixing valve

14: engine 30: separator

32: diaphragm

Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

2 is a block diagram illustrating a fuel system diagram of an LPG vehicle equipped with a separator according to the present invention.

As shown, the fuel tank (2) in which the compressed LPG is stored in the liquid state, and connected to the fuel tank (2) is provided to remove impurities mixed in the liquid LPG discharged from the fuel tank (2) An evaporator (4), a high pressure regulator (6) for vaporizing liquid LPG from which impurities have been removed by the filter (4), and an evaporator in which the vaporization process of LPG started to be evaporated by the high pressure regulator (6) is completed ( 8), a low pressure regulator 10 for further lowering the pressure of the LPG vaporized in the evaporator 8 to completely vaporize, and a mixing valve in which LPG and air completely vaporized by the low pressure regulator 10 are mixed ( 12) and the LPG vehicle fuel supply device in which a mixture of LPG and air mixed by the mixing valve 12 is introduced into and combusted in the combustion chamber of the engine 14, the low pressure regulator 10 and the mixing valve ( 12) the separator 30 for filtering the liquid LPG in the pipeline between the Is provided, but the upper end of the separator 30 is provided with a plate 32 to block the pipeline vertically.

The vaporized LPG flowing into the mixing valve 12 through the low pressure regulator 10 by the negative pressure of the mixing valve 12 passes through the separator 30, wherein the liquid LPG mixed in the vaporized LPG is The liquid LPG is moved to the mixing valve 12 side along the pipeline, and some liquid LPG falls to the bottom of the separator 30, and some of the liquid LPG falls to the bottom of the separator 30 by hitting the diaphragm 32. ) Does not flow into, and is accumulated in the separator (30).

LPG vehicle fuel supply device according to the present invention configured as described above is LPG compressed in the liquid state in the fuel tank (2) during operation of the engine is discharged due to the pressure in the tank is mixed in the LPG while passing through the filter (4) Impurities are removed and sent to the high pressure regulator (6).

Then, the liquid LPG introduced into the high pressure regulator 6 begins to vaporize in the high pressure regulator 6 and enters the evaporator 8 to complete the vaporization process of the LPG.

Then, the LPG vaporized while passing through the high pressure regulator (6) and the evaporator (8) is introduced into the low pressure regulator (10) and completely vaporized due to the negative pressure of the mixing valve (12) of the mixing valve (12) It will flow into the side.

At this time, the vaporized LPG flowing into the mixing valve 12 side is passed through the separator 30 is not provided with sufficient heat of vaporization in the vaporized LPG is not fully vaporized liquid LPG plate provided on the top of the separator 30 It hits (32) and does not flow into the mixing valve (12), and it collects in the separator (30).

Thus, the vaporized LPG in which the liquid LPG is filtered as described above is mixed with air in the mixing valve 12 to be introduced into the combustion chamber of the engine 14 and combusted.

As described above, the fuel supply device of the LPG vehicle of the present invention forms a separator provided with a diaphragm inside the pipeline between the low pressure regulator and the mixing valve to start the engine when the ambient temperature is low, such as in winter. In the LPG supplied to the combustion chamber of the engine to filter the LPG of the liquid that is not completely vaporized to prevent the liquid LPG from entering the combustion chamber is useful to improve the startability and fuel economy.

Claims (1)

A fuel tank (2) storing LPG compressed in a liquid state, and a filter (4) connected to the fuel tank (2) to remove impurities mixed in the liquid LPG discharged from the fuel tank (2); , A high pressure regulator 6 for vaporizing liquid phase LPG from which impurities are removed by the filter 4, an evaporator 8 in which the vaporization process of LPG started to be vaporized by the high pressure regulator 6 is completed, and the A low pressure controller 10 which further lowers the pressure of the LPG vaporized in the evaporator 8 so as to be completely vaporized; a mixing valve 12 in which LPG and air completely vaporized by the low pressure regulator 10 are mixed; In the fuel supply apparatus of an Elphi car in which a mixture of LPG and air mixed by the mixing valve 12 is introduced into the combustion chamber of the engine 14 and combusted, Separator 30 for filtering the liquid LPG in the pipeline between the low pressure regulator 10 and the mixing valve 12 is provided, the diaphragm 32 to block the pipeline on the inner upper end of the separator 30 Fuel supply device for an LLPHI vehicle, characterized in that provided vertically.