KR100371217B1 - Leak-proof structure even with fuel of automobile L.P. - Google Patents

Abstract

The present invention relates to a transient leakage prevention structure of liquid phase LPG when the gas phase LPG supply line breaks in an automotive LPG fuel supply device, and is connected to a tank for storing liquid-filled LPG and vaporized LPG vaporized therefrom. LPG supply line and gaseous LPG supply line to supply the supply, each supply line is provided with a shut-off valve to emergencyly block the flow of LPG in case of emergency, and the liquid and gaseous LPG supply lines In each provided with a switching valve for supplying LPG by selectively communicating with a single supply line connected to the carburetor, the gaseous LPG fuel supply switching valve 58 has an inlet to the gaseous LPG supply line 53 The passage 63 connected to the inside of the switching valve is connected to the outlet side connected to the vaporizer side together with the liquid phase LPG supply line 52, for example, a gas phase supply. When this is broken, the liquid LPG of the relatively high pressure supplied to the vaporizer side through the switching valve 57 acts on the upper side of the plunger 64 through the passage 63 so that the plunger does not open, so that the liquid LPG passes through the passage. It does not flow back to the inlet side to prevent leakage and eliminate the risk of explosion accident.

Description

Fuel leakage leak prevention structure of automobile L.P.

According to the present invention, in an automobile fueled by liquefied petroleum gas (hereinafter referred to as LPG), an LPG fuel is applied to a car vaporizer by combining a liquid LPG supply line and a gaseous LPG supply line from an LPG tank mounted on a vehicle trunk side. LPG fuel improved to prevent explosion accidents caused by gas leakage by blocking liquid LPG from flowing into damaged supply line when LPG supply line of car is damaged in LPG fuel supply device of automobile The present invention relates to a transient leakage prevention structure.

In general, gasoline automobiles obtain driving power by supplying gasoline in a carburetor to the engine cylinder by burning the gasoline in a vaporizer, but recently, technical difficulties caused by uniform atomization of liquid gasoline are solved. As a result, automobiles using LPG as fuel, which can reduce the driver's fuel cost due to low production cost and considerably lower price than gasoline, are increasing.

FIG. 1 schematically shows an LPG supply structure of a conventional LPG fuel vehicle, and illustrates only an LPG supply line structure from a tank to a carburetor for simplicity of the drawing.

As shown in the figure, since the LPG filled in the tank 1 is stored in the liquid phase and vaporized gaseous phase therefrom, the liquid phase LPG supply line 2 and the gas phase LPG supply line 3 are provided. (2,3) are provided with shut-off valves (4,5) for emergency shutoff of the flow of LPG, the supply lines being connected to a single supply line (7) connected to the vaporizer (6), each end of which On the side, switching valves 8 and 9 are provided for selectively communicating with the supply line 7.

The shut-off valves 4 and 5 and the switching valves 8 and 9 are normally solenoid valves, and their respective structures are the same, so that the switching valve 9 provided in the gas phase LPG supply line 3 will be described as an example. do.

The switching valve 9 communicates with the inlet 10 connected to the LPG supply line and the passage 12 formed at the upper end from the hollow portion communicated with the LPG supply line and the supply line 7 connected to the carburetor to the upper end 11. Is equipped with a solenoid 15 having a body 13 formed therein and a plunger 14 mounted on an upper portion thereof.

The coil 16 is embedded in the solenoid adjacent to the plunger 14, the spring 17 is mounted on the upper surface side of the plunger, the elastic force is applied in the direction of closing the plunger, that is, the downward direction, to the coil 16 When the current flows, the plunger 15 is raised by the electromagnetic force generated in a direction opposite to the spring 17 acting in the direction of closing the plunger, so that the passage 12 and the discharge port 11 communicate with each other. Since it is removed, the spring 17 lowers and returns to the original position, thereby blocking the passage 12 and the outlet 11, so that LPG can be selectively supplied to the supply line 7 of the vaporizer.

In addition, the hollow portion of the body 13 is equipped with a filter 18 to prevent foreign substances contained in the LPG into the cylinder, a hole 19 is formed in the side of the upper portion of the plunger, this hole Is in communication with the passage 12.

In addition, a chamber 21 is formed between the upper portion of the plunger and the stopper 20 to communicate with the outlet side. When the solenoid is not operated, the pressure of the gaseous LPG together with the spring 17 acts in the direction of lowering the plunger. By closing the passage 12 and the outlet 11, the operation of the solenoid to raise the plunger is in communication with the passage 12 and the discharge port so that the gaseous LPG is supplied to the vaporizer (6).

The LPG fuel supply device of such a structure is not shown when the LPG leaks due to breakage in the supply line 3 while the vehicle is in operation. However, when a sudden pressure drop in the line is detected by the pressure sensor, the normal control is performed. The shutoff valves are all closed by the method, but when the pressure of the liquid LPG in the supply line 2 is 1.5 kg / cm 2 or more, the plunger 14 of the switching valve 9 is raised by the pressure. As the passage 12 and the outlet 11 communicate with each other, the relatively high pressure liquid LPG flows back into the supply line 3 and excessively leaks through the broken portion, thereby causing an explosion accident.

On the other hand, if the working pressure of the spring 17 is made larger, the problem of opening the plunger 14 by the pressure of the LPG can be solved. However, in this case, the valve must be made very large, resulting in an increase in cost and narrow Since the size of the valve is limited by one mounting space, it is difficult to solve the problem caused by the pressure increase of the spring acting on the plunger.

The present invention is to solve the risk of explosion accident due to the leakage of the liquid LPG when the gas phase LPG supply line breakage in the above-described conventional LPG fuel supply device, without changing the structure of the existing LPG fuel supply device gas phase LPG The LPG flow is simply controlled to prevent backflow of liquid LPG to prevent leakage of liquid LPG in case of breakage of the supply line. Therefore, the present invention aims to provide a structure that prevents excessive leakage of LPG fuel, which is improved to be safe even when the LPG fuel supply line breaks while driving. It is done.

1 is a schematic LPG supply line configuration of a conventional LPG vehicle.

2 is a configuration diagram of the LPG supply line according to an embodiment of the present invention.

<Description of the symbols for the main parts of the drawings>

52: LPG supply line of liquid phase 53: LPG supply line of gas phase

57, 58: switching valve 59: inlet

60: exit 61: body

63 passage 64: plunger

66: solenoid 68: hole

70: spring

Excessive leakage prevention structure of the LPG fuel of the vehicle according to the present invention for achieving the above object is a tank for storing the LPG filled in the liquid phase and the vaporized gaseous LPG from it, and connected to the tank to supply LPG to the vaporizer LPG supply line and gaseous LPG supply lines of each liquid phase, each supply line has a shutoff valve provided to emergency shut off the flow of LPG in the event of a similar, and a single supply connected to the vaporizer liquid and gaseous LPG supply lines It is provided with a switching valve provided to supply LPG by selectively communicating with the line, the switching valve provided in the LPG supply line of the gas phase is connected to the LPG supply line of the inlet side and the outlet side is connected to the LPG supply line of the liquid phase A passage communicating with the outlet side is formed inside the switching valve body, and the upper end and the inlet of the outlet are raised when the solenoid is energized. The chamber, which is closed to open by the upper side of the plunger, communicates with the outlet side, and when the LPG supply line of the gas phase is broken, the pressure is higher than that of the gas phase LPG through the open liquid LPG supply switching valve. The liquid LPG acts on the top of the plunger so that the plunger does not rise unless it is operated by the solenoid so that the liquid LPG is prevented from leaking.

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

Figure 2 shows an LPG fuel supply structure employing an excessive leak prevention structure of LPG according to an embodiment of the present invention.

In the tank 51, LPG in the liquid phase and LPG in the gaseous phase vaporized therefrom are stored. For example, when the temperature of the outside air is high, the liquid phase LPG vaporizes to a gaseous state, thereby increasing the gas phase LPG pressure. Is supplied and the outside temperature is low, the pressure of the LPG gas is low, so in this case liquid LPG is supplied.

Accordingly, the liquid phase LPG supply line 52 and the gas phase LPG supply line 53 are provided between the tank 51 and the vaporizer 50 to selectively supply the liquid and gaseous LPG fuel to the vaporizer 50. do.

The supply lines 52 and 53 are provided with shut-off valves 54 and 55 for urgently shutting off the flow of LPG in case of emergency, and a single supply line 56 connecting the liquid and gas phase LPG supply lines to the vaporizer. There is provided a switching valve (57, 58) for selectively supplying the liquid or gaseous LPG in communication with each other).

Each of the selector valves 57 and 58 is provided with an inlet 59 and an outlet 60, and an inner end of the outlet 60 of the selector valve 58 passes through a filter 62 inside the body 61. While communicating with the 63, the passage 63 and the upper end of the inlets 59 are selectively communicated with the operation of the plunger 64 to be elevated.

That is, in each upper portion of the switching valves 57 and 58, a plunger 64 provided to be elevated in a hole formed in the center and a solenoid 66 in which the coil 65 is embedded in the outer wall of the hole are provided. Since the plunger 64 is raised by the magnetic force when the current flows, the passage 63 and the inlet port 59 in the case of the switching valve 58 and the passage 63 and the outlet 60 in the case of the switching valve 57. ) Communicating.

The rise of this plunger is limited by the stopper 67 provided at the top of the hole.

In addition, when the plunger 64 is lowered, the pressure of the LPG supplied through the liquid phase LPG supply line 52 is reduced in the passage 63 and the plunger 64. The solenoid 66 is introduced into the chamber 69 through the hole 68 formed from the side of the plunger to the site where the spring 70 is installed through the passage formed on the side, and acts to lower the plunger 64 together with the spring. If the plunger 64 is not raised by), communication between the passage 63 and the outlet 60 of the switching valve 57 is blocked, and the outlet 60 side of the switching valve 57 is connected to the vaporizer 50. It is configured to be connected to the supply line 56.

Therefore, when the LPG fuel supply line 53 in the gas phase is broken and the LPG leaks, the gas in the supply line leaks, but the liquid LPG of the relatively high pressure through the liquid LPG supply switching valve 57 is switched. When introduced into the body 61 of 58, the stopper 67 and the top of the plunger through the filter 62 and through the passage formed in the side of the passage 63 and the plunger 64 through the hole 68 on the side of the plunger. The plunger is kept closed because it flows into the chamber 69 and acts as a pressure to press the plunger downward with the spring 70.

In this case, the passage 63 and the inlet port 59 of the switching valve 58 is blocked so that the liquid LPG does not flow into the gas phase supply line 53, thereby preventing excessive leakage.

Of course, this action is the same when the normal LPG fuel is not supplied to the gas phase, the liquid LPG fuel is supplied to the vaporizer 50.

Then, when the liquid phase LPG fuel is not supplied and the gas phase LPG fuel is normally supplied to the vaporizer 50, the plunger 64 of the switching valve 57 is lowered by the spring 70 to pass through the passage 63 and the outlet ( It is to block the communication of 60, wherein the liquid LPG fuel in the switch valve 57 is introduced into the chamber 69 above the switch valve 57 through the hole 68 of the side of the plugger (64). Since the pressure acts in the direction of lowering the plunger 64 together with the spring 70, the pressure of the gaseous LPG fuel is weaker than these pressures, so that the plunger 64 cannot be opened. When the gas is normally supplied, the gaseous LPG fuel does not flow back to the liquid supply line 52.

According to such a leak-proof structure according to an embodiment of the present invention, in the LPG fuel supply apparatus of a vehicle having a liquid and gaseous supply line to selectively use liquid or gaseous LPG according to the conditions of the outside air, liquid or Even if LPG is continuously supplied through the liquid LPG supply line and the switching valve which is not damaged when the gas phase LPG supply lines are damaged, the pressure is applied to the upper surface of the plunger through the switch valve passage on the damaged side and the hole on the plunger side. Since the plunger keeps the passage and the inlet intact, the liquid LPG is not flowed back to the damaged gaseous LPG supply line so that the LPG leakage is minimized and there is no risk of explosion accident. Prevents and increases the stability of LPG fuel usage.

Claims (1)

A liquid phase LPG supply line 52 and a gas phase LPG supply line 53 connected to a tank 51 storing liquid phase LPG and vaporized LPG vaporized therefrom and supplying LPG to the vaporizer 50; Each of the supply lines is provided with shut-off valves 54 and 55 for emergency shutoff of the LPG in case of emergency, and selectively connects the liquid and gaseous LPG supply lines to a single supply line 56 connected to the vaporizer. Inlet 59 is provided in communication with the supply lines 52 and 53, respectively, and outlet 60 is in communication with the supply line 56 to supply LPG, and is formed in the upper center of the body 61 In the LPG fuel supply apparatus of an automobile provided with switching valves 57 and 58, each of which has a plunger 64 mounted up and down by a solenoid 66 and a spring 70, The switching valve 57 allows the inner end of the outlet 60 to communicate with the upper end of the passage 63 formed in the body 61, and the inlet 59 of the supply line 52 is connected to the lower end of the passage 63. The outlet 60 and the passage 63 are configured to communicate when the plunger 64 is raised and close when descending, The switching valve 58 allows the inner end of the outlet 60 to communicate with the lower end of the passage 63 formed in the body 61, and the inlet 59 of the supply line 53 is connected to the upper end of the passage 63. The inlet 59 and the passage 63 are configured to communicate with each other when the plunger 64 is raised and closed when the plunger 64 is lowered. The plungers 64, when lowered, are connected to the LPG supplied through the passage 63. The pressure flows upward through the passage formed in the side of the plunger 64 through the hole 68 formed up to the site where the spring 70 is installed, and acts in the direction of lowering the plunger 64. LPG fuel transient leak prevention structure of automobile.