KR100957466B1 - Fuel Pump for ??? Fuel of Remaining-gas withdrawal equipment and Withdrawal a method for The Same - Google Patents

Abstract

The present invention relates to a residual gas recovery device and a residual gas recovery method of an LPI fuel tank using a side flow external pump, and more particularly, safety by operation by discharging all to the outside so that residual fuel remains when repairing or replacing the fuel tank. There is a characteristic that can completely exclude the risk of an accident.

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,

An external type 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 fuel temporarily transferred by the external fuel pump for side flow through a connected pipe and temporarily storing the fuel;

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 tanks, automobiles, external fuel pumps for side flow, recovery tanks, LLP, carriers

Description

Fuel pump for LPG fuel of Remaining-gas with drawal equipment and Withdrawal a method for The Same}

The present invention relates to a residual gas recovery device and a residual gas recovery method of an LPI fuel tank using a side flow external pump, and more particularly, safety by operation by discharging all to the outside so that residual fuel remains when repairing or replacing the fuel tank. The present invention relates to a residual gas recovery device and a residual gas recovery method of an LPG fuel tank using a side flow external pump that can completely eliminate the risk of an accident.

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,

Provides residual gas recovery device and residual gas recovery method of LPG fuel tank using side flow external pump to completely eliminate the risk of safety accidents by discharging all the external to prevent residual fuel remaining when repairing or replacing fuel tank. The purpose is to.

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

An external type 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 fuel temporarily transferred by the external fuel pump for side flow through a connected pipe and temporarily storing the fuel;

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 and the residual gas recovery method of the LPG fuel tank using the side flow external pump of the present invention are discharged to the outside so that the residual fuel is not left during repair and replacement of the fuel tank safety according to the work It has the effect of completely eliminating the risk of an accident.

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,

An external type 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 fuel temporarily transferred by the external fuel pump for side flow through a connected pipe and temporarily storing the fuel;

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 valve (V1), operate the pump formed in the fuel tank and the external fuel pump for the side flow to transfer the fuel of the fuel tank through the pipe (P1), the fuel transferred through the pipe (P1) pipe ( The first three-way valve is controlled to flow into the inlet side of the external type external fuel pump without being transferred to P3), and the fuel discharged to the outlet side of the external external external fuel pump is transferred to the recovery tank through the pipe P2. By controlling the second three-way valve to recover the fuel to the recovery tank, to determine the flow of the fuel through a liquid level gauge formed with a sight window installed in the pipe (P1), when the fuel does not flow through the liquid level gauge pump and To stop the side flow external fuel pump and close the valve (V1),

Open the valve V5 to completely remove the gas remaining in the fuel tank, open and close the nitrogen tank to pressurize the nitrogen compressed inside the fuel tank through the pipe (P5), pressurized inside the fuel tank The residual gas is transferred to the combustor through the pipe P4 by the pressure of the nitrogen, and the fuel is completely removed from the fuel tank by burning the residual gas through the combustor.

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.

Figure 2 is a schematic diagram showing a residual gas recovery device of the automotive LPI fuel tank according to an embodiment of the present invention, Figure 5 is a cross-sectional view showing a side-facing external fuel pump according to an embodiment of the present invention, Figure 6 An exploded perspective view showing an external type external fuel pump according to an embodiment of the present invention, Figure 7 is a perspective view showing a fluid transfer unit according to an embodiment of the present invention, Figure 8 is a carrier according to an embodiment of the present invention It is a perspective view shown.

As shown in Figure 2, the residual gas recovery apparatus of the automotive LLP fuel tank of the present invention is the fuel tank (100, diesel, Gasoline, and the like, and recovers the fuel more safely and simply, and recharges 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 an external fuel pump for side flow connected to the 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-flow external fuel pump 200 through the connected pipe, and the fuel tank 100 with the fuel recovered to the recovery tank 300 Combustor 400 connected to the fuel tank 100 and the pipe to combust the gas remaining in the inside, and the fuel tank 100 to transfer the residual gas to the combustor 400 inside the fuel tank 100 It consists of a nitrogen tank 500 is connected to the pipe to pressurize the nitrogen pressure inside.

Here, a pipe P1 is installed between the fuel tank 100 and the external fuel pump 200 for side flow so that fuel is recovered / filled, and the pipe P1 is an inlet port of the external fuel pump 200 for side flow. 11) and the end is branched to both sides to be connected to the outlet (12).

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

In addition, a pipe P2 is installed between the side flow external fuel pump 200 and the recovery tank 300 so that the fuel in the fuel tank 100 is recovered. In this case, the pipe P2 is an external fuel pump for side flow. It is in communication with one end of the pipe (P1) connected to the outlet 12 side of the external external fuel pump 200 for side flow so as to be connected to the outlet 12 side of the (200).

Here, in the situation so that the fuel is transported according to the charge through the pipe (P1) to the portion connected to the pipe (P1) and the pipe (P2) connected to the outlet 12 side of the external type external fuel pump (200). The second three-way valve (V4) for opening and closing electronically in accordance with is installed.

Then, the pipe (P3) so that the fuel is transferred between the one end of the recovery tank 300 and the external type external fuel pump 200 for filling the fuel tank 100 temporarily stored in the recovery tank 300 again. This is installed. At this time, the pipe (P3) to one end of the pipe (P1) connected to the inlet 11 side of the external external fuel pump 200 for side flow so as to be connected to the inlet (11) side of the external external fuel pump (200) Communicating.

Here, a portion of the pipe P1 and the pipe P3 connected to the inlet 11 side of the external type external fuel pump 200 is connected to the fuel P via the pipe P1 depending on the situation in which the fuel is recovered / charged. The first three-way valve (V3) is installed to open and close by an external electronic signal in accordance with the situation so that the transfer.

In addition, a 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 pipe is connected between the nitrogen tank 500 and the pipe P1. P5 is provided, and the pipe P5 branches to one end of the pipe P1. At this time, the pipe (P5) is provided with a valve (V5) to open and close the nitrogen in the nitrogen tank (500).

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

Referring to FIGS. 5 and 6, the configuration of the external type external fuel pump 200 will be described in detail. First, a rotational force is applied to the flow chamber 10 and the flow chamber 10 for sucking and discharging the working fluid to the engine side. It consists of a rotational force supply unit 20 for supplying.

In the flow chamber 10, a fluid transfer part 40 for suctioning and discharging a working fluid by periodically changing a volume of space is disposed, and an inlet 12 and an outlet 13 formed on the flow chamber 10 are provided. The working fluid is introduced into and discharged from the fluid transfer part 40 by the. At this time, the fluid transfer part 40 is disposed in the flow chamber 10, the lid 30 is further formed to seal and is installed as shown in Figs.

In addition, a rotational force supply unit 20 in which a motor for rotating the fluid transfer unit 40 is embedded is formed at one side of the flow chamber 10. At this time, the end portion of the rotational force supply unit 20 is blocked by the supply unit cover 22 is coupled by the coupling means so that the motor or the internal inspection, etc. installed therein can be opened and closed when necessary.

By this configuration, the suction direction of the working fluid coincides with the rotation direction of the fluid transfer part 40, thereby reducing the resistance of the flow and improving the suction efficiency.

In this case, the flow chamber 10 and the rotational force supply unit 20 are isolated from each other because the operating fluid flowing by the fluid transfer unit 40 is prevented from leaking to the rotational force supply unit 20.

Hereinafter, the fluid transfer part 40 will be described with reference to FIGS. 6 and 7.

The carrier 42 is disposed in the donut-shaped cylinder 44, and the roller 43 is disposed in the carrier 42. At this time, the fluid is sucked and discharged by the rotational movement of the carrier 42 and the roller 43, as described in detail in the applicant's Patent No. 508281. At this time, the flow path of the working fluid to be sucked and discharged is due to the first plate 41 and the second plate 45.

The first plate 41 and the second plate 45 have a similar shape, and the protrusions 45b protrude from the flat portion 45a having a disc shape. The protruding portion 45b has a shape in which a circular portion or a side surface protrudes in a fan shape at the center portion of the flat portion 45a. However, in the center of the second plate 45, the rotation shaft through-hole 45c for penetrating the rotation shaft 21 extending from the motor is formed is different.

In addition, a working fluid is formed between the first plate 41 and the cylinder 44 and between the second plate 45 and the cylinder 44 by the pivoting movement of the carrier 42 and the roller 43. It is sucked through the suction gap I which is discharged and discharged to the discharge gap O which is formed on the opposite side of the suction gap I.

Here, referring to FIG. 8, the carrier 42 has a through hole 1 formed in a central portion such that the rotation shaft 21 of the rotational force supply unit 20 is coupled to one end surface of the through hole 1. The circular protrusions 2 and the carrier 42 are pushed to one side by the pressure of the fuel, and the center of the through-hole 1 is provided to give the same pressure to both sides to prevent noise and damage caused by friction. A plurality of grooves 3 formed in the circumferential direction of the circular protrusion 2 and a rotating member (not shown) formed to reduce friction of the outer circumferential surface of the carrier 42 when the carrier 42 is rotated are inserted. It consists of a coupling part 4 formed in the outer peripheral surface. At this time, the coupling part 4 serves as a guide that guides the fuel introduced by protruding in one direction in which the circular protrusion 2 is introduced into the groove part 3.

Here, the circular protrusion 2 protrudes from the center of the upper side of the carrier 42, and a through hole 1 coupled to the drive shaft of the motor is formed at the center of the circular protrusion 2.

At this time, the circular protrusion 2 is formed to protrude to a constant height so that the groove portion 3 is formed in the circumferential direction so that the groove portion 3 is formed inward from the outer circumferential surface of the protrusion portion 2, and the groove portion 3 is formed. Through the fuel introduced into the fuel pump is introduced.

Here, the groove 3 is formed on the upper side of the circular protrusion 2 to inject fuel into the groove 3 to increase the pressure in the groove 3 to the opposite side of the groove (3) carrier ( 42) to push away.

At this time, the reason why the pressure of the fuel is raised through the groove part 3 and pushed toward the opposite side of the groove part 3 is transferred to the one side by the carrier 42 when the fuel is introduced into the fuel pump. The fuel then pushes the carrier 42 to one side with a strong pressure in the opposite direction to which the fuel is conveyed. Then, the carrier 42 is in contact with the case (not shown) formed on the outside, the friction force is increased by the rotation to generate noise and breakage.

To prevent it, the groove 3 is formed to maintain the same pressure on both sides in response to the pressure of the fuel to be transported, so that the carrier 42 is not in contact, thereby preventing noise and damage.

As shown in Figure 8, the groove portion 3 is formed in a plurality of circumferential direction on the upper surface of the circular projection (2), each one groove is formed with a predetermined interval length from the outer direction to the inner direction, The groove 3 is formed in a spiral shape as a whole.

At this time, the one groove is formed such that the width is narrower from the outer direction to the inner direction so that the fuel is introduced into the groove portion 3 to increase the pressure to push the carrier 42 to the opposite side of the groove portion, The pressure of the fuel at the innermost side increases most.

The working fluid conveyed through the fluid transfer part 40 as described above is introduced through the inlet 12 as shown in FIG. Thereafter, the working fluid is introduced into the fluid transfer part 40 by the suction hole 12a which is formed at an upper side of the inner circumferential surface of the space part 11 in which the fluid transfer part 40 is accommodated and communicates with the inlet 12. The discharge hole 13a is formed at one side of the suction hole 12a to communicate with the discharge port 13 and discharged.

As described above, the flow direction of the fluid is in contact with the rotational direction of the fluid transfer part 40 by the configuration of the inlet 12, the suction hole 12a, the outlet 13, and the discharge hole 13a. At the moment of contact between the fluid and the fluid transfer part 40, the flow direction becomes the same direction, thereby improving suction efficiency as described above.

Meanwhile, as described above, the flow chamber 10 and the rotational force supply unit 20 are isolated from each other so that the fluid pressurized in the flow chamber 10 does not leak, and the rotational force supply unit 20 does not pass through the working fluid. A separate chiller is needed.

Meanwhile, as described above, the flow chamber 10 and the rotational force supply unit 20 are isolated from each other. At this time, the rotating shaft 21 extending from the motor embedded in the rotational force supply unit 20 and connected to the fluid transfer unit 40 penetrates. A rotating shaft through hole 15 is formed as shown in FIG. 5.

Since the working fluid flowing in the flow chamber 10 by the rotating shaft through hole 15 may leak into the rotating force supply unit 20, the sealing member 16 is installed in the rotating shaft through hole 15 to leak. It is desirable to prevent this.

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 LLP fuel tank using a side flow external pump according to an embodiment of the present invention.

As shown in FIG. 3, in the residual gas recovery method, the valve V1 is opened, and a pump formed in the fuel tank 100 and an external type external fuel pump 200 for side flow are operated to supply fuel through a pipe P1. The fuel of the tank 100 is transferred into the external flow pump 200 for side flow, and at this time, the external fuel pump 200 flows through the pipe P1 without being transferred to the pipe P3. The first three-way valve (V3) is controlled to flow into the inlet (11) side of the. That is, the first three-way valve (V3) is sealed inside the pipe (P3) side by an external electrical signal to allow the fuel to flow only to the pipe (P1).

And, the fuel discharged to the outlet 12 side of the external type external fuel pump 200 is transferred to the recovery tank 300 through the pipe (P2), at this time, by controlling the second three-way valve (V4) Fuel is recovered to the recovery tank 300 through the pipe (P2).

As described above, 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 determined through the liquid level gauge 60 having the viewing window installed in the pipe P1, and the liquid level gauge 60 is If the fuel does not flow through the pump of the fuel tank 100 and the external fuel pump for side flow 200 is stopped and the valve (V1) of the pipe (P1) is closed.

Finally, the valve V5 of the pipe P5 is opened to completely remove the gas remaining in the fuel tank 100, the nitrogen tank 500 is opened and closed, and the nitrogen compressed therein is fueled through the pipe P5. Pressurized to the inside of the tank 100, the residual gas is transported by the pressure of nitrogen pressurized inside the fuel tank 100, at this time, the residual gas is transferred to the combustor 400 through a pipe (P4) By the operation of the combustor 400 to completely burn the residual gas to completely remove the fuel in 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 valve V1 is opened, and the external fuel pump 200 for side flow is operated to provide a pipe P3. It transfers the fuel of the recovery tank 300 through. At this time, the fuel transferred from the recovery tank 300 through the pipe P1 connected to the pipe P3 by controlling the first three-way valve V3 to the inlet 11 side of the external type external fuel pump 200 for side flow. Transfer.

The fuel transferred through the outlet 12 of the external external fuel pump 200 is transferred to the fuel tank 100 through a pipe P1, and at this time, the outlet of the external external fuel pump 200. The second three-way valve V4 is controlled so that the fuel transported through the 12 is not transferred to the pipe P2 connected to the pipe P1.

Finally, when it is confirmed that fuel does not flow through the liquid level gauge 60 installed in the pipe P1, the external type external fuel pump 200 is stopped and the valve V1 is closed to complete the filling of the fuel tank.

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 view showing a residual gas recovery method of the LLP fuel tank using a side flow external pump 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 an external type external fuel pump according to an embodiment of the present invention.

Figure 6 is an exploded perspective view showing an external type external fuel pump according to an embodiment of the present invention,

7 is a perspective view showing a fluid transfer unit according to an embodiment of the present invention,

8 is a perspective view showing a carrier according to an embodiment of the present invention.

Description of the Related Art

10: flow chamber 20: rotational force supply

40: fluid transfer part 41: the first plate

42: carrier 43: roller

44 cylinder 45 second plate

100: fuel tank 200: external fuel pump for side flow

300: recovery tank 400: combustor

500: nitrogen tank

Claims (11)

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, An external type 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 flow 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 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 valve V2 for opening and closing the inside at one end of the gas pipe P6 is provided. Residual gas recovery device of the automotive LLP fuel tank, characterized in that the installation further. The method of claim 1, Between the fuel tank 100 and the external type external fuel pump 200, a pipe P1 is branched from one end to both sides to be connected to the external type external fuel pump 200 so as to recover / fill fuel. A pipe P2 is installed between the side flow external fuel pump 200 and the recovery tank 300 so that the fuel of the fuel tank 100 is recovered, and the fuel temporarily stored in the recovery tank 300 is again stored in the fuel tank 100. Pipe (P3) is installed so that the fuel for the charge is transferred between the one end of the recovery tank 300 and the external type external fuel pump 200 for charging to the), the fuel tank 100 and the combustor 400 A pipe P4 is installed between the nitrogen tank 500 and the pipe P1 so that the gas remaining in the fuel tank 100 is transferred therebetween, and the pipe P5 is installed in the pipe P5. It characterized in that the valve (V5) is installed to open and close the nitrogen in the nitrogen tank (500) Residual gas recovery device for automotive LPI fuel tank. 3. The method of claim 2, The pipe (P1) is provided with a 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 pipe (P1) is installed, the pipe (P1) Residual gas recovery device of the automotive LLP fuel tank, characterized in that the pressure gauge 70 for checking the internal pressure is installed. 3. The method of claim 2, In the situation that the fuel is transported according to the recovery / charging through the pipe (P1) to the site connected to the pipe (P1) and the pipe (P3) connected to the inlet 11 side of the external type external fuel pump 200 for side flow Residual gas recovery device of the automotive LLP fuel tank, characterized in that the first three-way valve (V3) for opening and closing accordingly. 3. The method of claim 2, Electronically in accordance with the situation so that the fuel is transported as the fuel is charged through the pipe (P1) connected to the pipe (P1) and the pipe (P2) connected to the outlet 12 side of the external fuel pump 200 for side flow Residual gas recovery device of the automotive LLP fuel tank, characterized in that the opening and closing the second three-way valve (V4). According to claim 1, wherein the external type external fuel pump 200, Flow chamber in which the working fluid is conveyed by the fluid conveying part 40 which inhales and discharges the working fluid by periodically changing the space volume, and the working fluid flows in and out in a direction tangential to the rotational direction of the fluid conveying part 40. 10; A rotational force supply unit 20 which is formed while being partitioned with the flow chamber 10 while a motor for supplying rotational force is provided to the fluid transfer unit 40; Residual gas recovery device of the automotive LLP fuel tank, characterized in that comprises a. The method of claim 6, wherein the fluid transfer unit 40, A carrier (42) disposed therein, which is rotated by the rotating shaft (21) of the rotational force supply unit (20) to suck and discharge the working fluid and a cylinder (44) disposed in the roller (43); A first path disposed on the front side of the carrier 42 to provide a flow path of the suctioned working fluid, and having a circular shape in the center of a flat plate portion, and protruding portions protruding in a fan shape on both sides thereof; A plate 41; It is disposed on the rear side of the carrier 42 to provide a flow path for discharging the sucked working fluid, is formed in a circular shape in the center of the flat portion 45a of the disk-shaped while protruding in a fan shape on both sides A second plate 45 having a protrusion 45b and a through hole 45c through which the rotation shaft 21 of the rotational force supply unit 20 penetrates in the center of the protrusion 45b; Residual gas recovery device of the automotive LLP fuel tank, characterized in that comprises a. The method of claim 7, wherein the carrier 42, A through hole (1) formed in a central portion such that the rotation shaft (21) of the rotation force supply unit (20) is coupled; A circular protrusion (2) formed at one end surface of the through hole (1); The carrier 42 is pushed to one side by the pressure of the fuel and is contacted in the circumferential direction of the circular protrusion 2 around the through hole 1 so as to note the same pressure on both sides to prevent noise and damage caused by friction. It is formed in a plurality of grooves, each one groove is formed with a predetermined interval length from the outer direction to the inward direction, the fuel flows inward so that the pressure rises to push in the opposite side of the first plate 41 A groove portion 3 formed in a spiral shape having a narrow width; Residual gas recovery device of the automotive LLP fuel tank, characterized in that comprises a. In the method of operating the residual gas recovery device of the automotive LPI fuel tank 100 according to any one of claims 1 to 6, At fuel recovery, Open the valve (V1), operate the pump formed in the fuel tank 100 and the external fuel pump for side flow 200 to transfer the fuel in the fuel tank 100 through the pipe (P1), the pipe (P1) The first three-way valve (V3) is controlled so that the fuel transported through the inlet to the inlet 11 side of the external type external fuel pump 200 does not transfer to the pipe (P3), the external external fuel pump By controlling the second three-way valve (V4) so that the fuel discharged to the discharge port 12 side of the 200 is transferred to the recovery tank 300 through the pipe (P2) to recover the fuel in the recovery tank 300, the Determine the flow of fuel through the liquid level gauge 60 formed with a sight glass installed in the pipe (P1), when the fuel does not flow through the liquid level gauge 60 and the external fuel pump 200 for the fuel tank and side flow Stop and close the valve (V1), The valve V5 is opened to completely remove the gas remaining in the fuel tank 100, the nitrogen tank 500 is opened and closed, and the compressed nitrogen is pressurized into the fuel tank 100 through the pipe P5. In addition, the residual gas is transferred to the combustor 400 through the pipe P4 by the pressure of nitrogen pressurized inside the fuel tank 100, and the residual gas is combusted through the combustor 400. 100) Residual gas recovery method of the LPG fuel tank using a side flow external pump, characterized in that to completely remove the fuel inside. The method of claim 9, When recharging the fuel to the fuel tank 100 to recover and replace the fuel, Open the valve (V1), operate the external fuel pump for side flow 200 to transfer the fuel in the recovery tank 300 through the pipe (P3), at this time, by controlling the first three-way valve (V3) The fuel transferred from the recovery tank 300 is transferred to the inlet port 11 of the external flow pump 200 for side flow through the pipe P1 connected to the pipe P3, and the discharge port of the external flow pump 200 for side flow flows. The fuel transported through the 12 is transferred to the fuel tank 100 through the pipe P1, and at this time, the fuel transported through the outlet 12 of the external type external fuel pump 200 flows through the pipe P1. The second three-way valve (V4) is controlled so as not to be transferred to the pipe (P2) connected to the control, and when it is confirmed that the fuel does not flow through the liquid level meter 60 installed in the pipe (P1) external fuel pump for side flow 200 Stop and close the valve (V1) to complete the filling in the fuel tank (100) Method is recovery of the residual gas Injector fuel tank side stream using an external pump. delete

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