KR20010000291U - Cutoff device to back currenting LPG - Google Patents

Abstract

The present invention relates to a LPG backflow blocker,

Liquid transfer pipe 20 through which the liquid LPG is transferred from the fuel tank 1, gas transfer pipe 21 through which the LPG gas is transferred from the fuel tank 1, and liquid according to the temperature of the cooling water. Consisting of a first and second switching valves 22 and 23 consisting of a coil 25, a plunger 26, and a filter 24 for removing foreign matter from the LPG. In

An inlet portion 28 connecting the liquid transfer pipe 20 and the gas transfer pipe 21 to the first and second switching valves 22 and 23 is connected to the first and second switching valves 22 and 23. Directly connected to the plunger 26 side, the liquid or gaseous LPG passing through the plunger 26 is configured to be supplied to the filter 24 through the discharge unit 29,

LPG gas backflow does not occur even if the liquid transfer pipe 20 or the gas transfer pipe 21 is damaged, thereby preventing gas leakage accidents and improving the safety of the LPG vehicle. It relates to an LPG backflow blocker.

Description

Cutoff device to back currenting LPG}

The present invention relates to an LPG backflow cut-off device, and in particular, an inlet is a switching valve when connecting an inlet of a switching valve for selectively supplying a liquid or gaseous LPG to an LPG-fueled engine and a liquid transfer pipe or a gas transfer pipe. LPG passing through the plunger is supplied to the filter through the discharge part, so that the reverse flow of LPG does not occur even if the transport pipe of either the liquid transport pipe or the gas transport pipe is broken, so that the gas leak accident. The present invention relates to an LPG backflow blocker that can prevent the gas in advance and significantly improve the safety of the LPG vehicle.

In general, LPG is cheaper than gasoline, so many users who want to reduce vehicle maintenance costs are using LPG fueled vehicles.

1 shows a conventional LPG supply apparatus applied to an LPG vehicle,

A liquid tank (2) storing liquid LPG in the lower end of the inside and a gaseous LPG in the upper end of the inside, and a liquid pipe (2) for discharging the liquid LPG to the outside of the fuel tank (1); In addition, the gas pipe (3) for discharging the gaseous LPG to the outside of the fuel tank (1) and the liquid LPG or gas pipe (3) passing through the liquid pipe (2) according to the cooling water temperature of the vehicle First and second shut-off valves 4 and 5 for selectively passing gaseous LPG and liquid or gaseous LPG discharged from the first and second shut-off valves 4 and 5, respectively, The liquid conveying tube 6 and the gas conveying tube 7 serving as a passage conveyed to the rear stage and the liquid or gaseous LPG conveyed through the liquid conveying tube 6 and the gas conveying tube 7 selectively pass through the discharge tube 10. It consists of a first and a second switching valve (8) (9) to be supplied to the evaporator through.

In addition, each of the configured valves 4, 5, 8, 9 includes a filter 13 for removing foreign substances contained in the liquid or gaseous LPG, and a control supplied from a controller (not shown). And a coil 14 for generating an electric field according to the voltage, and a plunger 15 for operating by the electric field generated in the coil 14 to substantially block or pass the LPG.

In addition, the first and second switching valve (8) (9) is a liquid transfer pipe 6 or gas transfer pipe

And an inlet portion 11 connecting the seven to the filter 13, and a discharge portion 12 for guiding the LPG passing through the filter 13 to the plunger 15 side.

Referring to the operation of the conventional LPG supply device configured as described above are as follows.

In LPG vehicles, it is determined whether liquid LPG is supplied to the engine or gaseous LPG to the engine depending on the coolant temperature.

That is, when the temperature of the coolant is low, such as when ignition of the engine, LPG in gaseous state is supplied to the engine, and when the engine is driven for a certain time and the temperature of the coolant rises above a certain value, the liquid LPG is supplied to the engine. do.

In the above description, the liquid or gaseous LPG is not directly supplied to the engine, but the liquid LPG is converted into the gaseous state and then supplied to the engine while passing through a separate evaporator.

Based on the above description, the operation of the conventional LPG supply apparatus will be described.

When the temperature of the cooling water is below a predetermined value, the plunger 15 of the first shut-off valve 4 and the first switching valve 8 is closed by the control voltage supplied from the outside, and the liquid LPG is transferred to the liquid transfer pipe 6. The plunger 15 of the second shut-off valve 5 and the second switching valve 9 is opened so that the LPG in the gas state is the gas pipe 3, the second shut-off valve 5 and the gas. It moves in the order of the feed pipe 7 and the second switching valve 9 and is supplied to the evaporator 10 through the discharge pipe 10.

The gaseous LPG supplied to the evaporator 10 is supplied to the engine again and used as fuel for generating power of the engine.

When the engine is driven for a predetermined time by the fuel supply operation as described above and the temperature of the coolant rises above a certain value, the first shutoff valve 4 and the first switching valve 8 are controlled by a control voltage supplied from the outside from this time. LPG in the liquid state is supplied to the evaporator 10 while the plunger 15 of the plunger 15 is opened, and the plunger 15 of the second shut-off valve 5 and the second switching valve 9 is closed by a control voltage, LPG will not be supplied to the evaporator 10.

However, in the conventional LPG supply device, the inlet portion constituting the first and second switching valves 8 and 9 connects the liquid transfer pipe 6 or the gas transfer pipe 7 to the filter 13. And the discharge part 12 connects the filter 13 and the plunger 15 side, the second switching valve if the first switching valve 8 is opened in a state where the gas transfer pipe 7 is broken. The high pressure liquid LPG passing through (8) is supplied to the evaporator through the discharge pipe (10) and at the same time, the gas flows back to the gas transfer pipe (7) while pushing up the plunger of the second switching valve (9) which is in a closed state. There was a problem of leaking through the broken portion of the pipe (7), there was a problem that causes an explosion accident if the LPG leaks in this way.

Therefore, the present invention for solving the above problems is an engine using LPG as a fuel when the inlet portion of the switching valve for selectively supplying the liquid state or gaseous LPG and the liquid transfer pipe or gas transfer pipe when the inlet portion of the switching valve Direct connection to the plunger side, and LPG passing through the plunger is supplied to the filter through the discharge portion, so that the LPG backflow does not occur even if either of the liquid transfer pipe or the gas transfer pipe is broken, thereby preventing the leakage of gas. It is an object of the present invention to provide an LPG backflow blocker that can be prevented in advance and that can greatly improve the safety of LPG vehicles.

Features of the present invention for achieving the above object,

Liquid supply pipe for transporting liquid LPG from the fuel tank, gas transport pipe for transporting gas LPG from the fuel tank, and for supplying or blocking liquid or gaseous LPG depending on the temperature of the cooling water. In the first and second switching valve composed of a coil, a plunger and a filter for removing foreign matter of the LPG,

The inlet portion connecting the liquid transfer pipe and the gas transfer pipe to the first and second switching valves is directly connected to the plunger side of the first and second switching valves, and the liquid or gaseous LPG passing through the plunger is discharged through the discharge part. Configured to feed to the filter,

It is characterized in that the reverse flow of LPG gas does not occur even if the liquid transport pipe or the gas transport pipe is damaged.

1 is a view showing a conventional LPG supply.

Figure 2 is a view showing the LPG backflow blocker of the present invention.

※ Explanation of code for main part of drawing

1: fuel tank 2: liquid pipe

3: gas pipe 20: liquid transfer pipe

21 gas transfer pipe 22 first switching valve

23: second switching valve 24: filter

25 coil 26 plunger

27: discharge pipe 28: inlet

29: discharge part

Hereinafter, a preferred embodiment of the present invention with reference to the accompanying drawings, as follows.

According to the drawings, the present invention provides a liquid transfer pipe 20 through which the liquid LPG discharged from the fuel tank 1 through the liquid pipe 2 and the first shut-off valve 4 is transferred to the first shut-off valve 4. And a gas transfer pipe 21 formed to connect the first switching valve 22 and the gaseous LPG discharged from the fuel tank 1 through the gas pipe 2 and the second shut-off valve 5. Is formed to connect the second shut-off valve 5 and the second switching valve 23.

The first switching valve 22 and the second switching valve 23 is opened and closed by a control voltage supplied from the outside so that the liquid LPG or LPG in the gaseous state is selectively supplied to the evaporator through the discharge pipe 27. Each valve 22, 23 is a filter 24 for filtering foreign matter contained in the LPG, the coil 25 and the plunger 26 to be opened and closed by a control voltage to substantially block or pass the LPG. It is configured to include.

In the present invention, the inlet portion 28 connecting the liquid transfer tube 20 and the gas transfer tube 21 to the first and second switching valves 22 and 23 has a plunger of each valve 22, 23. Directly connected to the (26) side, the LPG passed through the plunger 26 is formed to move downward through the discharge unit 29 to be supplied to the filter 24 side.

As described above, the inlet 28 is directly connected to the plunger 26 side of the valves 22 and 23, and the outlet 29 is connected to the filter 24 side below from the plunger 26 side. When formed, the LPG passing through the other valve in the state in which the valves 22 and 23 are closed prevents the LPG from flowing back in the event that the LPG does not push back in the closed state.

For example, assuming that the first switching valve 22 is opened and the second switching valve 23 is closed while the gas transfer pipe 21 is broken,

LPG in the liquid state is conveyed through the liquid transfer pipe 20 is moved to the plunger 26 side through the inlet portion 28 and then supplied again to the filter 24 through the discharge portion 29, the filter 24 LPG in the liquid state passed through is supplied to the evaporator through the discharge pipe (27).

At this time, a portion of the liquid LPG flows back to the filter 24 side of the second switching valve 23 and flows back to the plunger 26 side of the second switching valve 23, but the liquid LPG flowing back flows through the filter ( Since the pressure is somewhat canceled while passing through 24, and the discharge portion 29 is connected to the side portion of the plunger 26 in the closed state, the LPG in the liquid state flowing back is plunger 26 of the second switching valve 23. You will not be able to push up.

Accordingly, the LPG in the access state does not flow back to the gas transfer pipe 21 in the damaged state so that the LPG leakage accident does not occur.

In the operation as described above, even when the first switching valve 22 is closed and the second switching valve 23 is opened, the LPG in the gaseous state does not flow back to the access pipe 20 by the same action.

In the description of the present invention, the same operation as in the prior art has been omitted in order to avoid redundant description.

As described above, the present invention is an engine using LPG as a fuel, and the inlet is directly connected to the plunger side of the switching valve when the inlet of the switching valve selectively supplying liquid or gaseous LPG is connected. LPG passing through this plunger is supplied to the filter through the discharge part, so that no reverse flow of LPG occurs even if any of the liquid transport pipes or the gas transport pipes is broken, thereby preventing gas leakage accidents. LPG backflow blocker that can improve the safety of LPG vehicle.

Claims (1)

Liquid transfer pipe 20 through which the liquid LPG is transferred from the fuel tank 1, gas transfer pipe 21 through which the LPG gas is transferred from the fuel tank 1, and liquid according to the temperature of the cooling water. First and second switching valves 22 comprising a coil 25 and a plunger 26 for supplying or blocking LPG in a gaseous or gaseous state and a filter 24 for removing foreign matter from the LPG. In consisting of (23), An inlet portion 28 connecting the liquid transfer pipe 20 and the gas transfer pipe 21 to the first and second switching valves 22 and 23 is connected to the first and second switching valves 22 and 23. Directly connected to the plunger 26 side, the liquid or gaseous LPG passing through the plunger 26 is configured to be supplied to the filter 24 through the discharge unit 29, LPG gas backflow blocking device characterized in that the backflow of LPG gas does not occur even if the liquid transfer pipe 20 or gas transfer pipe 21 is damaged.