KR101006874B1 - Automobile Fuel Pump for ??? Fuel of Remaining-gas withdrawal equipment - Google Patents

Abstract

The present invention relates to a residual gas recovery device of an automotive LPI fuel tank, and more particularly, it can be completely discharged to the outside so that residual fuel is not left during repair and replacement of the fuel tank to completely eliminate the risk of safety accidents due to work. There is a characteristic.

As described above, according to the present invention, when a fuel tank of an automobile is maintained, the fuel in the fuel tank is transferred to a recovery tank, and after the maintenance, the automobile LPI fuel for reinjecting the fuel temporarily stored in the recovery tank into the fuel tank again. In the residual gas recovery device of the tank,

A side-feeding inline external fuel pump connected to the pipe to transfer fuel through the pipe connected to the fuel tank of the vehicle;

A recovery tank for recovering and temporarily storing fuel transported by the side feeding in-line external fuel pump through a connected pipe;

A combustor connected to the fuel tank and a pipe to combust the gas remaining in the fuel tank in which the fuel is recovered to the recovery tank;

And a nitrogen tank connected to the pipe to pressurize the nitrogen pressure inside the fuel tank to transfer the residual gas to the combustor in the inside of the fuel tank.

Fuel Tank, Automobile, Side Feeding Inline External Fuel Pump, Recovery Tank, LPG

Description

Residual gas recovery system for automotive Elpji fuel tanks {Automobile Fuel Pump for LPF fuel of Remaining-gas withdrawal equipment}

The present invention relates to a residual gas recovery device of an automotive LPI fuel tank, and more particularly, it can be completely discharged to the outside so that residual fuel is not left during repair and replacement of the fuel tank to completely eliminate the risk of safety accidents due to work. The present invention relates to a residual gas recovery apparatus for an automotive LPI fuel tank.

Since the fuel tank for the LPG vehicle is filled with flammable liquid LPG gas, there is a risk of explosion when the fuel leaks. To maintain the fuel tank, it is necessary to consume all remaining fuel in the fuel tank. .

Therefore, when repairing a fuel tank, it is common to transfer the fuel contained in the fuel tank to a separate recovery tank and to reinject the fuel stored in the recovery tank into the fuel tank after repair. By means of recovery and recharging.

Referring to the configuration of the conventional embodiment of such a fuel recovery and recharging device, as shown in Figure 1, the recovery tank 3 for temporarily storing the fuel in the fuel tank 2, the fuel tank and the recovery tank by connecting the fuel tank and recovery tank A fuel transfer line 4 acting as a passage, a plurality of control valves 5 installed on the fuel transfer line to regulate the flow of fuel, and a fuel tank and a recovery tank installed on the fuel transfer line. A vacuum pump 6 for vacuuming each tank by forcibly exhausting residual gas, and an automatic ignition unit for visually confirming whether each tank is in a vacuum state (no fuel gas) depending on ignition. It consists of (7).

Such a conventional fuel recovery and recharging apparatus makes the fuel tank 2 vacuum by the vacuum pump 6 at the time of fuel recovery, and conversely, when the fuel tank is charged, the recovery tank 3 is also vacuumed by the vacuum pump. Then, it is checked whether or not the tank is in a vacuum state as whether the auto ignition unit 7 in communication with each tank is ignited.

That is, if gaseous fuel remains inside the tank, the inside of the tank is relatively high pressure relative to atmospheric pressure, so if the tank is in communication with the atmosphere, the gaseous fuel in the tank is automatically discharged by the pressure difference. Since the auto ignition unit 7 uses this principle, the gas is naturally burned by the ignition while the gas is naturally exhausted through the auto ignition unit until the inside of the tank becomes equal to atmospheric pressure.

However, if the inside of the tank is equal to atmospheric pressure, the gaseous fuel in the tank is no longer discharged, and even though there is fuel remaining inside the tank, the autoignition device is extinguished, which can be mistaken as no fuel remaining in the tank. Maintenance work will be carried out without risk being completely eliminated.

Therefore, the tank vacuum checking method in the existing system has a very low reliability, which may cause a problem of a safety accident. In addition, since the conventional vacuum pump 7 is large in size, the overall size of the apparatus is increased in proportion to it. Difficulties in movement and handling of the device.

SUMMARY OF THE INVENTION Accordingly, the present invention has been made keeping in mind the above problems occurring in the prior art,

The purpose of the present invention is to provide a residual gas recovery device for an automotive LPI fuel tank, which can be discharged to the outside so that no residual fuel remains when repairing or replacing the fuel tank, thereby completely eliminating the risk of safety accidents.

In order to achieve the above object, the present invention provides a vehicle for transporting and storing fuel in the fuel tank to a recovery tank during maintenance of the fuel tank of the vehicle, and re-injecting the fuel temporarily stored in the recovery tank into the fuel tank after maintenance. In the residual gas recovery device of the LPI fuel tank for

A side-feeding inline external fuel pump connected to the pipe to transfer fuel through the pipe connected to the fuel tank of the vehicle;

A recovery tank for recovering and temporarily storing fuel transported by the side feeding in-line external fuel pump through a connected pipe;

A combustor connected to the fuel tank and a pipe to combust the gas remaining in the fuel tank in which the fuel is recovered to the recovery tank;

Residual gas recovery apparatus of the automotive LPI fuel tank comprising a; nitrogen tank connected to the pipe to pressurize the nitrogen pressure inside the fuel tank to transfer the residual gas to the combustor inside the fuel tank; It is about.

As described above, the residual gas recovery device of the automotive LLP fuel tank of the present invention can be completely discharged to the outside so that residual fuel is not left during repair and replacement of the fuel tank to completely eliminate the risk of safety accidents due to work It works.

The present invention has the following features to achieve the above object.

According to the present invention, when the fuel tank of an automobile is maintained, the fuel in the fuel tank is transferred to a recovery tank, and after the maintenance, the residual LPI fuel tank for an automobile is re-injected into the fuel tank. In the gas recovery device,

A side-feeding inline external fuel pump connected to the pipe to transfer fuel through the pipe connected to the fuel tank of the vehicle;

A recovery tank for recovering and temporarily storing fuel transported by the side feeding in-line external fuel pump through a connected pipe;

A combustor connected to the fuel tank and a pipe to combust the gas remaining in the fuel tank in which the fuel is recovered to the recovery tank;

And a nitrogen tank connected to the pipe to pressurize the nitrogen pressure inside the fuel tank to transfer the residual gas to the combustor in the inside of the fuel tank.

In addition, the present invention is a method of operating the residual gas recovery device of the automotive LPI fuel tank,

At fuel recovery,

Open the first valve (V1), operate the pump formed in the fuel tank and the side-feeding in-line external fuel pump to transfer the fuel in the fuel tank through the first pipe (P1), the first pipe (P1) The first three-way valve is controlled so that the fuel transported through is not transferred to the third pipe (P3) to the inlet side of the side feeding in-line external fuel pump, and the fuel discharged to the outlet side of the side feeding in-line external fuel pump By controlling the second three-way valve to be transferred to the recovery tank through the second pipe (P2) to recover the fuel in the recovery tank, to grasp the flow of fuel through the liquid level meter formed with a sight window installed in the first pipe (P1) When the fuel does not flow through the level gauge, the pump and side feeding in-line external fuel pump of the fuel tank is stopped and the first valve (V1) is closed,

Opening the third valve (V5) to completely remove the gas remaining in the fuel tank, opening and closing the nitrogen tank to pressurized nitrogen inside the fuel tank through the fifth pipe (P5), the fuel tank The residual gas is transferred to the combustor through the fourth pipe (P4) by the pressure of the nitrogen pressurized in the inside, and the residual gas is combusted through the combustor to completely remove fuel in the fuel tank.

The present invention having such characteristics can be more clearly described by the preferred embodiments thereof.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. Prior to this, terms or words used in the specification and claims should not be construed as having a conventional or dictionary meaning, and the inventors should properly explain the concept of terms in order to best explain their own invention. Based on the principle that can be defined, it should be interpreted as meaning and concept corresponding to the technical idea of the present invention.

Therefore, the embodiments described in the specification and the drawings shown in the drawings are only one of the most preferred embodiments of the present invention and do not represent all of the technical idea of the present invention, various modifications that can be replaced at the time of the present application It should be understood that there may be equivalents and variations.

FIG. 2 is a schematic view showing a residual gas recovery apparatus of an automotive LPI fuel tank according to an embodiment of the present invention. FIG. 5 is a cross-sectional view illustrating a side-feeding inline external fuel pump according to an embodiment of the present invention. Is an exploded perspective view showing a side-feeding inline external fuel pump according to an embodiment of the present invention, Figure 7 is an enlarged cross-sectional view showing a portion A of FIG.

As shown in FIG. 2, the residual gas recovery apparatus of an automotive LPI fuel tank of the present invention includes fuel (LP, diesel, gasoline) stored therein for repair and replacement or inspection due to damage of the fuel tank 100 of an automobile. Etc.) to recover the fuel more safely and conveniently, and to recharge the recovered fuel after the repair, replacement, and inspection of the fuel tank 100 is completed. The present invention is a structure that can recover and refill fuel.

The residual gas recovery device includes a fuel tank 100 having a small pump (not shown) therein and a side feeding in-line external fuel pump connected to a pipe to transfer fuel through a pipe connected to the fuel tank 100 of the vehicle. (200), a recovery tank 300 for recovering and temporarily storing the fuel transported by the side-feeding inline external fuel pump 200 through the connected pipe, and the fuel tank with the fuel recovered to the recovery tank 300 A combustor 400 connected to the fuel tank 100 and a pipe to combust the gas remaining inside the tank 100, and a fuel tank to transfer the residual gas to the combustor 400 in the fuel tank 100. It consists of a nitrogen tank 500 connected to the pipe to pressurize the nitrogen pressure inside the (100).

Here, a first pipe P1 is installed between the fuel tank 100 and the side feeding in-line external fuel pump 200 so that fuel is recovered / filled, and the first pipe P1 is a side-feeding in-line external fuel pump. End portions are branched to both sides to be connected to the inlet 11 and the outlet 12 of the (200).

At this time, the first pipe (P1) is provided with a first valve (V1) for opening and closing the inside, the liquid level gauge 60 formed of a viewing window so that the user can check the fuel transported inside the first pipe (P1) is The pressure gauge 70 for checking the pressure inside the first pipe P1 is installed.

In addition, a second pipe P2 is installed between the side feeding in-line external fuel pump 200 and the recovery tank 300 so that the fuel of the fuel tank 100 is recovered. In this case, the second pipe P2 is It is communicated with one end of the first pipe (P1) connected to the outlet 12 side of the side feeding in-line external fuel pump 200 to be connected to the outlet 12 side of the external side in-line external fuel pump 200.

Here, the fuel is charged through the first pipe (P1) to a portion where the first pipe (P1) and the second pipe (P2) connected to the outlet 12 side of the side-feed in-line external fuel pump 200 is connected. The second three-way valve (V4) is installed to open and close electronically in accordance with the situation so that the transfer according to.

And, the third pipe so that the fuel is transferred between the one end of the recovery tank 300 and the side-feeding in-line external fuel pump 200 to fill the fuel tank 100 temporarily stored in the recovery tank 300 again. (P3) is installed. At this time, the third pipe (P3) is the first pipe connected to the inlet 11 side of the side-feeding inline external fuel pump 200 to be connected to the inlet (11) side of the side-feed in-line external fuel pump 200 ( It communicates with one end of P1).

Here, the first pipe P1 and the third pipe P3 connected to the inlet 11 side of the side feeding in-line external fuel pump 200 are connected to each other through the first pipe P1 according to a situation. The first three-way valve V3 is installed to be opened and closed by an external electronic signal in accordance with the situation so that the fuel can be transported according to recovery / filling.

In addition, a fourth pipe P4 is installed between the fuel tank 100 and the combustor 400 so that the gas remaining in the fuel tank 100 is transferred, and the nitrogen tank 500 and the first pipe P1. The fifth pipe (P5) is installed between the, and the fifth pipe (P5) is branched to one end of the first pipe (P1). In this case, a third valve V5 is installed in the fifth pipe P5 to open and close nitrogen in the nitrogen tank 500.

In addition, between the fuel tank 100 and the recovery tank 300, a gas phase pipe (P6) is provided to maintain the same pressure on both sides, the second valve for opening and closing the inside of one end of the gas pipe (P6) (V2) is further installed.

As shown in FIG. 5 and FIG. 6, the side feeding in-line external fuel pump 200 includes a housing 10, a pumping unit 20, and a motor unit 30.

The housing 10 is composed of an inlet 11 formed on the side so that the L-PGE fuel is introduced and an outlet 12 formed at one end thereof so that the L-PGE fuel introduced through the inlet 11 is discharged. 10 is connected to a fuel tank (not shown), and the outlet 12 of the housing 10 is connected to a fuel injector (fuel injector, not shown) of the engine.

That is, the fuel pump 100 according to the embodiment of the present invention is an external fuel pump installed in a fuel line connecting the fuel tank and the fuel injector.

Here, a space is formed in the inlet 11 side of the housing 10 so that the pumping unit 20 is installed, and another space is formed in the outlet 12 side so that the motor unit 30 can be installed. do. At this time, the guide film 13 is formed to divide the internal space of the housing 10 into the pumping unit 20 side and the motor unit 30 side, the LP film through the pumping unit 20 in the guide film 13 A fuel passage 14 is formed to transfer fuel to the motor unit 30, and the fuel passage 14 has a constant angle so that the LLP fuel is smoothly transferred to the motor unit 30 by the rotation of the pumping unit 20. Is formed.

The pumping unit 20 is connected to the first shaft 32 of the motor unit 30, is rotated by the first shaft 32 to inject the LLP fuel through the inlet 11 of the housing 10 The roller vane 21 for conveying the inside of the housing 10, the roller 24 formed to surround the outer circumferential surface of the roller vane 21, and is disposed on one side of the roller vane 21, A first plate 22 having a fan-shaped inlet groove 25 formed on both lower ends thereof so that the LPV fuel introduced by the roller vane 21 flows in the lateral direction, and disposed on the other side of the roller vane 21. However, the conveying hole 26 is formed to be bent by the roller vane 21 to be pulled by the inlet groove 25 of the first plate 22 to convey the inflow of the LLP fuel in the vertical direction, the first shaft Consists of a second plate 23 through which a through hole 27 is formed in the center portion so that the 32 passes through the roller vane 21. The. In this case, the roller vanes 21 may also be used in a gear rotor method.

In addition, the roller vane 21 is connected to the first shaft 32 of the motor unit 30 is driven to rotate by the first shaft 32, the first shaft 32 is the roller vane 21 The end portion is in contact with the first plate 22. At this time, the ball is completely integrally coupled to the end of the first shaft 32 so that the end of the first shaft 32 is formed in a round arc shape, the end of the round arc shape of the first shaft 32 Due to the negative, when the first shaft 32 is rotated, the friction with the first plate 22 can be reduced, thereby preventing wear and damage. In addition, a groove (not shown) is formed at one end of the first plate 22 in contact with the end of the first shaft 32 such that the first shaft 32 is not spaced apart from the left and right sides.

In addition, the pumping unit 20 sequentially laminates and combines the second plate 23, the roller 24, the roller vanes 21, and the first plate 22, and then is separated from the outside or inside the housing 10. It is sealed by the cover 28 as a finish so that the introduced LLP fuel is not discharged to the outside other than the outlet 12.

The motor unit 30 is connected to the pumping unit 20 so that the pumping unit 20 is driven so that the first end 32 is formed integrally with the ball, and formed on the opposite side of the first shaft 32 And an electric motor connected between the second shaft 36 supported on the outlet 12 side of the housing 10 and the first shaft 32 and the second shaft 36 to generate rotational force by electricity. It consists of 31 is installed in the housing (10).

Here, of course, any actuator may be used in addition to the electric motor 31. In addition, the electric motor 31 includes a permanent magnet 34 and a rotor 33 disposed in a magnetic field region generated by the permanent magnet 34. Since the electric motor 31 is obvious to those skilled in the art, the detailed description thereof will be omitted.

In addition, the first and second shafts 32 and 36 are formed to protrude to both sides of the electric motor 31 by a predetermined interval, and the first shaft 32 to fix the electric motor 31 inside the housing 10. The guide membrane 13 is installed through the second shaft 36, and one side of the second shaft 36 is inserted into the housing 10 of the outlet 12 at a predetermined interval to fix the electric motor 31. At this time, the bushing 40 is fitted to the outer circumferential surfaces of the first and second shafts 32 and 36 in contact with the housing 10 so that the first and second shafts 32 and 36 are rotated, thereby reducing the friction to the minimum. Make it smooth. At this time, the bushing 40 is obvious to those skilled in the art to which the present invention pertains, and thus a detailed description thereof will be omitted.

Here, the bushing 40 is installed on the outer circumferential surface of the housing 10 and the first and second shafts 32 and 36, but is not fixed, so that the bushing 40 is rotated when the first and second shafts 32 and 36 are rotated. By being spaced apart at regular intervals from the housing 10, no wear occurs between the bushing 40 and the housing 10. Accordingly, the durability of the fuel pump 100 is improved to increase the life of the fuel pump 100.

At this time, however, when the bushing 40 is spaced apart, the electric motor 31 and the first and second shafts 32 and 36 of the motor unit 30 may not be fixed while being shaken. The ball 35 is inserted into the end portion (part of contact with the outlet 10 side housing 10) of the 36, the ball 35 is inserted into the housing when the second shaft 36 is rotated The ball 35 is not fixed to minimize friction with the 10. A coupling groove 36a is formed at the end of the second shaft 36 so that the ball 35 can be inserted therein.

As such, the ball 35 is inserted into the end of the second shaft 36 to prevent the electric motor 31 and the second shaft 36 of the motor unit 30 from shaking, and also the motor shaft. And wear of the housing 10 can be reduced.

In addition, an insertion groove 15 is formed in the inner surface of the outlet 12 side housing 10 in accordance with the ball 35 inserted into the end of the second shaft 36 so that the ball 35 is not separated. Prevent it.

Here, the ball 35 is inserted to be detachably attached to the end of the second shaft 36 or attached in various ways, such as being fixed integrally with the second shaft 36.

Hereinafter, the residual gas recovery and recharging method based on the residual gas recovery apparatus of the automotive LLP fuel tank described above will be described together with the accompanying drawings.

Figure 3 is a schematic diagram showing a residual gas recovery method of the automotive LLP fuel tank according to an embodiment of the present invention.

As shown in FIG. 3, in the residual gas recovery method, the first valve V1 is opened, and the pump and the side feeding in-line external fuel pump 200 formed in the fuel tank 100 are operated to operate the first pipe ( The fuel of the fuel tank 100 is transferred into the side feeding in-line external fuel pump 200 through P1), and at this time, the fuel transferred through the first pipe P1 is not transferred to the third pipe P3. The first three-way valve (V3) is controlled to be introduced to the inlet 11 side of the side-feeding in-line external fuel pump 200 without. That is, the first three-way valve (V3) is sealed inside the third pipe (P3) side by an external electrical signal to allow the fuel to flow only to the first pipe (P1).

And, the fuel discharged to the outlet 12 side of the side-feeding in-line external fuel pump 200 is transferred to the recovery tank 300 through the second pipe (P2), the second three-way valve (V4) By controlling the fuel is recovered to the recovery tank 300 through the second pipe (P2).

As such, the fuel of the fuel tank 100 is transferred to the recovery tank 300 for a predetermined time, and the flow of the fuel is detected through the liquid level gauge 60 having the viewing window installed in the first pipe P1, and the liquid level gauge 60 If the fuel does not flow through the) and the fuel pump 100 and the side feed in-line external fuel pump 200 is stopped and the first valve (V1) of the first pipe (P1) is closed.

Lastly, the third valve V5 of the fifth pipe P5 is opened to completely remove the gas remaining in the fuel tank 100, and the nitrogen tank 500 is opened and closed to discharge the nitrogen compressed therein into the fifth pipe. Pressurize the inside of the fuel tank 100 through P5, and the residual gas is transported by the pressure of nitrogen pressurized inside the fuel tank 100, wherein the residual gas is the fourth pipe P4. Transfer to the combustor 400 through the combustion of the residual gas by the operation of the combustor 400 to completely remove the fuel inside the fuel tank (100).

Figure 4 is a schematic diagram showing a method for refilling the residual gas of the automotive LLP fuel tank according to an embodiment of the present invention.

As shown in FIG. 4, when recharging the fuel of the recovery tank 300 to the fuel tank 100, the first valve V1 is opened, and the side feeding in-line external fuel pump 200 is operated to perform a third operation. The fuel of the recovery tank 300 is transferred through the pipe P3. At this time, the first three-way valve (V3) to control the fuel transferred from the recovery tank 300 through the first pipe (P1) connected to the third pipe (P3) of the side-feed in-line external fuel pump 200 Transfer to the inlet (11) side.

In addition, the fuel transferred through the outlet 12 of the side feeding in-line external fuel pump 200 is transferred to the fuel tank 100 through the first pipe P1, wherein the side feeding in-line external fuel pump ( The second three-way valve V4 is controlled so that the fuel transferred through the outlet 12 of the 200 is not transferred to the second pipe P2 connected to the first pipe P1.

Finally, when it is confirmed that fuel does not flow through the liquid level gauge 60 installed in the first pipe P1, the side feeding in-line external fuel pump 200 is stopped and the first valve V1 is closed to fill the fuel tank. To complete.

1 is a schematic view showing a fuel recovery device of a conventional LPP vehicle fuel tank,

2 is a schematic view showing a residual gas recovery apparatus of the automotive LLP fuel tank according to an embodiment of the present invention,

3 is a schematic diagram showing a residual gas recovery method of an automotive LPI fuel tank according to an embodiment of the present invention,

4 is a schematic view showing a method for refilling residual gas of an automotive LPI fuel tank according to an embodiment of the present invention;

5 is a cross-sectional view showing a side-feeding in-line external fuel pump according to an embodiment of the present invention.

6 is an exploded perspective view showing a side-feeding inline external fuel pump according to an embodiment of the present invention;

FIG. 7 is an enlarged cross-sectional view illustrating a portion A of FIG. 5.

Description of the Related Art

100: fuel tank 200: side feed in-line external fuel pump

300: recovery tank 400: combustor

500: nitrogen tank

Claims (10)

During maintenance of the fuel tank 100 of the vehicle, the fuel in the fuel tank 100 is transferred to the recovery tank 300 and stored, and after maintenance, the fuel temporarily stored in the recovery tank 300 is again stored in the fuel tank 100. In the residual gas recovery apparatus of the automotive LPI fuel tank 100 to be re-injected, A side-feeding inline external fuel pump 200 connected to the pipe to transfer fuel through the pipe connected to the fuel tank 100 of the vehicle; A recovery tank 300 for temporarily storing the fuel transported by the side feeding in-line external fuel pump 200 through a connected pipe; A combustor 400 connected to the fuel tank 100 and a pipe to combust the gas remaining in the fuel tank 100 in which the fuel is recovered to the recovery tank 300; And a nitrogen tank 500 connected to a pipe to pressurize nitrogen pressure inside the fuel tank 100 to transfer the residual gas to the combustor in the fuel tank 100. The side-feeding in-line external fuel pump 200 is an inlet 11 formed at the side so that the L-PGE fuel is introduced and an outlet 12 formed at one end thereof so that the L-PGE fuel introduced through the inlet 11 is discharged. A housing 10 made up of; It is provided in the housing 10 is connected to the first shaft 32 of the motor unit 30, it is rotated by the first shaft 32 through the inlet 11 of the housing 10, the LLP fuel It is disposed on the roller vane 21 for introducing the transport to the inside of the housing 10, the roller 24 formed to surround the outer peripheral surface of the roller vane 21, and one side of the roller vane 21, The first plate 22 having a fan-shaped inlet groove 25 formed at both lower ends of the both sides so that the LPV fuel introduced by the roller vane 21 flows in the lateral direction and the other side of the roller vane 21 are formed. Is disposed in the, the conveying hole 26 is formed to be bent so as to transfer the LLP fuel introduced through the inlet groove 25 of the first plate 22 by the roller vane 21 in the vertical direction, the first A second plate having a through hole 27 formed in the center thereof so that the first shaft 32 penetrates the roller vane 21. A pumping unit 20 including 23; A first shaft 32 connected to the roller vane 21 of the pumping unit 20 so that the roller vane 21 is driven, the first end 32 being integrally formed with the ball, and opposite to the first shaft 32. It is formed between the second shaft 36, the ball 35 is inserted into the end portion in contact with the outlet side housing and the first shaft 32 and the second shaft 36 is connected to the rotational force by electricity The electric motor 31 to generate and the electric motor 31 is fixed to the inside of the housing 10 so that the first and second axes 32 and 36 rotate. 36 consists of a bushing (40) installed in the contact portion of the motor unit 30 is installed in the housing (10); Residual gas recovery device of the automotive LLP fuel tank, characterized in that comprises a. The method of claim 1, Between the fuel tank 100 and the side-feeding in-line external fuel pump 200, a first pipe P1 branched from both ends to both sides to connect the side-feeding in-line external fuel pump 200 so as to recover / charge fuel is connected to the fuel tank 100 and the side-feeding in-line external fuel pump 200. A second pipe P2 is installed between the side feeding in-line external fuel pump 200 and the recovery tank 300 to recover the fuel of the fuel tank 100 and is temporarily stored in the recovery tank 300. In order to charge the fuel back to the fuel tank 100, a third pipe (P3) is installed to transfer the fuel for filling between one end of the recovery tank 300 and the side-feeding in-line external fuel pump 200, the A fourth pipe P4 is installed between the fuel tank 100 and the combustor 400 so that the gas remaining in the fuel tank 100 is transferred, and between the nitrogen tank 500 and the first pipe P1. Characterized in that the fifth pipe (P5) is installed Residual gas recovery unit in the same borrower Injector fuel tank. 3. The method of claim 2, The first pipe (P1) is provided with a first valve (V1) for opening and closing the inside, the liquid level meter 60 formed of a sight glass so that the user can check the fuel transported inside the first pipe (P1) is installed And a pressure gauge (70) for checking an internal pressure of the first pipe (P1) is installed. The method of claim 1, The gas phase pipe P6 is installed between the fuel tank 100 and the recovery tank 300 so as to maintain the same pressure on both sides, and a second valve V2 that opens and closes the inside at one end of the gas pipe P6. Residual gas recovery device of the automotive LLP fuel tank, characterized in that is further installed. 3. The method of claim 2, Fuel is recovered / filled through the first pipe P1 at a portion where the first pipe P1 and the third pipe P3 connected to the inlet 11 of the side feeding in-line external fuel pump 200 are connected. Residual gas recovery device of the LLP fuel tank for cars, characterized in that the first three-way valve (V3) to be opened and closed electronically in accordance with the situation to be transported according to. 3. The method of claim 2, According to the filling of the fuel through the first pipe (P1) to a portion where the first pipe (P1) and the second pipe (P2) connected to the outlet 12 side of the side-feeding in-line external fuel pump 200 is connected Residual gas recovery device of the LLP fuel tank for cars, characterized in that the second three-way valve (V4) to be opened and closed electronically in accordance with the situation to be transported. 3. The method of claim 2, The fifth pipe (P5) is a residual gas recovery device of the automotive LLP fuel tank, characterized in that the third valve (V5) is installed to open and close the nitrogen in the nitrogen tank (500). delete delete delete

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