KR100614669B1 - Lpg recovery and refill system - Google Patents

Abstract

The present invention relates to a device for automatically recovering and refilling residual gas of an LPG tank for a vehicle.

The present invention, the air compressor that can inhale and compress only the air in the atmospheric pressure configuration of the system to be able to suck the compressed gas under pressure and also to function as a vacuum pump to vacuum the suction side, The air compressor, recovery tank, and vehicle LPG tank are connected and configured by using the solenoid valve and connecting pipe which can be opened and closed automatically.In case of repairing the LPG tank for vehicles, a compressor function is used to press the gas from the recovery tank into the vehicle LPG tank. By raising the pressure of the vehicle LPG tank, the liquid gas of the vehicle LPG tank is first recovered, and all gaseous gases are recovered and stored in the recovery tank until the vehicle LPG tank becomes a vacuum state, and automatically stored in the vacuum vehicle LPG tank. As a result, external air flows in, and only a small amount of remaining gas is diluted in the air. It is possible to make it possible to automatically recharge the gas which has been recovered after draining the air from the vehicle LPG tank to the vacuum state before recharging the gas even after the maintenance work is completed. In addition to protecting workers' lives and property from the explosion and fire hazards that may occur during maintenance work of LPG tanks for vehicles, it also prevents wasted energy losses by recovering all the gases released to the outside. It is to provide a device that can also prevent contamination.

LPG tank for vehicle, recovery tank, solenoid valve, compressor, recharge, vacuum, recovery device, residual gas

Description

LPG recovery and refill system for automatic recovery of residual gas from vehicle LP tank

1 is a state diagram for recovering the residual gas of the vehicle LPG tank as a recovery tank in one embodiment of the present invention.

Figure 2 is a state refilling the residual gas in the vehicle LPG tank in one embodiment of the present invention.

Figure 3 is a block diagram of an operation control unit according to an embodiment of the present invention.

Figure 4 is an automatic stop pressure setting state of the recovery tank in one embodiment of the present invention.

5 is a diagram illustrating a restart pressure differential setting state of the recovery tank in one embodiment of the present invention.

Figure 6 is an initialization setting state of the first and second pressure sensors in one embodiment of the present invention.

Figure 7 is a schematic diagram showing a state in which the pressure regulator and the zero pressure correction device is connected to the compressor in one embodiment of the present invention.

* Explanation of symbols for major parts of drawing *

10; Recovery tank 20; LPG tank for vehicle

30; Compressor 41,42; 1st and 2nd tank connector

41a, 42a; 1.2 pressure sensors 43, 44, 45, 46; 1, 2, 3, 4 connector

47; Air valve 50; Liquid Liquid Recovery Filling Tube

51; Liquid valve 61; Power switch

62,63; First and second display portions 64; Pressure setting function selector switch

65; Pressure setting switch 66; Recovery switch

67; Recharge switch 68; System control

43a, 44a, 45a, 46a, 47a; 1, 3, 2, 4, 5 solenoid valve

The present invention relates to a device for automatically recovering and refilling residual gas in an LPG tank for a vehicle, and more particularly, to automatically recovering liquid and gaseous gases from a vehicle LPG tank and repairing the LPG tank. After finishing, the automatically recovered liquid gas is automatically refilled with the LPG tank for cars to prevent safety accidents caused by the gas during maintenance work of the LPG tank for vehicles, as well as to prevent the energy loss of the gas due to the discharge. The present invention relates to a device for automatically recovering and recharging residual gas of an LPG tank for a vehicle that can also prevent air pollution.

As is well known, a vehicle LPG tank having a saturation pressure has a structure in which a gas is supplied to a carburetor and a mixer through a pipeline after installing a tank main body in a trunk of the vehicle, and at least one or more additional devices in the tank body. Is installed.

At this time, the vehicle LPG tank as described above is mainly provided in the front curved portion of the tank body, the piping portion consisting of a gas phase valve, a liquid valve and a filling valve, and an accessory such as a liquid level meter is installed.

Accordingly, existing LPG tanks for vehicles require repair of accessories in case of failure of each accessory or leakage of gas. In principle, any gas remaining inside the tank is required to be repaired. It must be removed before it can be repaired.

However, the maintenance work of the LPG tank for vehicles in the past requires only liquid remaining in the tank to be recovered to the recovery tank by the differential pressure of the compressor, and then the gas is discharged to the atmosphere. Of course, there is a problem that a large-scale safety accidents, including human life damage, such as a flammable gas that is heavier than the air accumulates around the explosion accident due to carelessness of the operator.

In order to solve the above-mentioned problems, the applicant of the present invention discloses a patent application No. 2003-17911 dated March 21, 2003 (name of the invention; automatic gas recovery and refilling device of an LLP tank for a vehicle, hereinafter referred to as "prior patent"). In order to improve the above conventional problems, the present invention complements the prior patent.

In other words, the present invention comprises a compressor system that can perform the function of the vacuum pump as well as the suction of the compressible gas as well as the air compressor capable of inhaling and compressing only the gas of atmospheric pressure below the air compressor, recovery tank and vehicle LPG tank, By configuring the connection through the solenoid valve and the connection pipe that can be automatically opened and closed, the liquid and gas gas of the vehicle LPG tank is completely and safely recovered to the recovery tank when the LPG tank is repaired, and after the maintenance work is completed, the LPG tank of the vehicle is By automatically recharging the recovered liquid gas to a vehicle LPG tank after extracting the air, it is possible to terminate the work more easily, and to prevent the loss of gas caused by the existing maintenance work of the vehicle LPG tank, In addition, the remaining LPG tank for vehicles to prevent the occurrence of safety accidents due to gas during maintenance work It is an object of the present invention to provide an automatic gas recovery and refilling device.

Residual gas automatic recovery and recharging device of the vehicle LPG tank of the present invention for achieving the above object,

Recovery tank provided with the first and second piping;

A vehicle LPG tank having third and fourth pipes and remaining liquid and gas gas;

A compressor having fifth and sixth pipes for suctioning and discharging so as to be connected to the recovery tank and the vehicle LPG tank, and moving gas between tanks;

A connection pipe having an electromagnetic valve and configured to effectively regulate a gas flow between the recovery tank and the vehicle LPG tank;

The first and third pipes of the recovery tank and the vehicle LPG tank are connected to each other, and when the vehicle LPG tank is converted into a vacuum state by the compressor, a forced recovery of the recovery tank for residual gas in the vehicle LPG tank and a vehicle LPG tank are performed. A liquid recovery filling tube having a liquid valve to guide refilling of the liquid; And,

An operation control unit for determining an operation state of automatic recovery and recharging of residual gas in the vehicle LPG tank; Characterized in that comprises a configuration.

According to another aspect, the connector,

A first tank connecting pipe having a first pressure sensor for detecting the pressure of the recovery tank and connected to the second pipe;

First and second connecting pipes branched from the first tank connecting pipe and having first and third solenoid valves, respectively;

A second tank connecting pipe having a second pressure sensor for detecting the LPG tank of the vehicle and connected to the fourth pipe;

A third connecting pipe branched from the second tank connecting pipe, connected to the first connecting pipe, and having a second solenoid valve open and closed;

A fourth connecting pipe branched from the second tank connecting pipe, connected to the second connecting pipe, and having a fourth solenoid valve openable and closed; And,

An air valve connected to the second and fourth connecting pipes and having a fifth solenoid valve openable; Characterized in that comprises a configuration.

According to another aspect, the operation control unit,

Power switch to control the power of the residual gas recovery and recharge system,

First and second display units displaying a pressure value of the first and second pressure sensors when the power switch is turned on;

Pressure setting function selection switch for setting the difference between the automatic stop pressure and the restarting pressure of the compressor when the power switch is supplied,

A pressure setting switch for setting a range between an automatic stop pressure and a restart pressure selected by the pressure setting function selection switch when the power switch is turned on;

Recovery switch for starting the recovery process for the residual gas of the vehicle LPG tank when the power switch is input,

Recharging switch for starting the recharging process for the residual gas into the vehicle LPG tank when the power switch is input,

Automatic control of opening and closing of solenoid valves and solenoid valves provided in the connecting pipe and the liquid recovery filling tube as well as driving the compressor to recover and recharge the residual gas in the vehicle LPG tank from the pressing of each switch. Characterized in that it comprises a program-controlled system control unit.

According to yet another aspect, the system control unit,

The program of the safe operation function that automatically stops the operation of the compressor when the pressure of the recovery tank detected by the first pressure sensor when the power switch is turned on is 0.9 MpaAbs, and automatically restarts when the pressure is lowered by 0.2 MpaAbs. Characterized in that the mounting configuration.

According to another aspect, the stop pressure is characterized in that it is set in units of 0.1 MpaAbs.

According to another aspect, the pressure difference required for restarting is set to 0.2, 0.15, 0.1 Mpa in units of 0.05 Mpa.

According to yet another aspect, the system control unit,

When the pressure of the recovery tank sensed by the first pressure sensor is 1.1 MpaAbs or more, it is determined that the abnormal pressure rises and the operation state of the compressor is stopped, and the operation stop state is equipped with a program of a safe operation function which is restarted only through a reset. It is characterized by the configuration.

According to yet another aspect, the reset is characterized in that by the procedure to turn on again after shutting off the power switch.

According to yet another aspect, the operation control unit,

An alarm sound output unit for outputting an alarm sound through the control of the system controller when the pressure of the recovery tank detected by the first pressure sensor exceeds 1.1 MpaAbs and the refilling of the residual gas is completed; Characterized in that further comprises a.

According to yet another aspect, the system control unit,

When the residual gas recovery process or the recharging process is in progress, other process switches are equipped with a program of a safe operation function.

Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings.

1 is a state diagram for recovering the residual gas of the vehicle LPG tank to the recovery tank in an embodiment of the present invention, Figure 2 is a state diagram for recharging the gas recovered in the vehicle LPG tank in one embodiment of the present invention.

3 is a block diagram of an operation control unit according to an embodiment of the present invention, and FIG. 4 is a diagram illustrating an automatic stop pressure setting state of a recovery tank according to an embodiment of the present invention. FIG. 5 is a view illustrating a recovery tank according to an embodiment of the present invention. Figure 6 is a reset state of the differential pressure setting, Figure 6 is an initialization setting state of the first and second pressure sensors in one embodiment of the present invention.

Referring to Figures 1 and 3, the residual gas automatic recovery and recharging device of an embodiment of the present invention has a mobile or fixed body connected to the recovery tank 10 and the vehicle LPG tank 20, although not shown in the drawings, The main body is provided with a compressor 30, a connecting tube, a liquid gas liquid recovery filling tube 50, and an operation control unit.

The recovery tank 10 has a first pipe 11 connected to the liquid recovery filling pipe 50 so that only liquid gas is sucked and discharged, and a second pipe connected to the connection pipe so that only gaseous gas is sucked and discharged. Piping 12 is provided.

The vehicle LPG tank 20 has a third pipe 21 connected to the liquid recovery filling pipe 50 so that only liquid gas is sucked and discharged, and a third pipe 21 connected to the connection pipe so that only gaseous gas is sucked and discharged. Four pipes 22 are provided.

The compressor (30) is the fifth and sixth of the suction and discharge connected to the recovery tank 10 and the vehicle LPG tank 20 for gas transfer of the recovery tank 10 and the vehicle LPG tank 20 Pipes 31 and 32 are provided, which converts the vehicle LPG tank 20 into a vacuum state through the connecting pipe so that the recovery and recharging of residual gas can be made more fully under the control of the operation control unit. It also functions as a vacuum pump.

The connecting pipe and the compressor 30 and the recovery tank 10 so as to automatically recover the residual gas from the vehicle LPG tank 20 to the recovery tank 10 and to automatically recharge the vehicle LPG tank 20 again. Connecting the vehicle LPG tank 20, which is the first, second tank connection pipes (41, 42), as well as the first, second, third, fourth connection pipes (43) (44) (45) (46) And an air valve 47.

The first tank connecting pipe 41 is connected to the second pipe 12 and includes a first pressure sensor 41a for detecting the pressure of the recovery tank 10.

The second tank connecting pipe 42 is connected to the fourth pipe 22 and includes a second pressure sensor 42a for pressure sensing of the vehicle LPG tank 20.

The first and second connection pipes 43 and 44 are branched from the first tank connection pipe 41, respectively, and the first and second connection pipes 43 and 44 are respectively controlled by the operation control unit. First and third solenoid valves 43a and 44a which open and close automatically are provided.

The third connecting pipe 45 is branched from the second tank connecting pipe 42 to be connected to the first connecting pipe 43, the second solenoid valve is opened and closed automatically under the control of the operation control unit ( 45a).

The fourth connecting pipe 46 is branched from the second tank connecting pipe 42 to be connected to the second connecting pipe 44, and the fourth solenoid valve is opened and closed automatically under the control of the operation control unit ( 46a).

The air valve 47 is connected to the second and fourth connecting pipes 44 and 46 and includes a fifth solenoid valve 47a which is automatically opened and closed under the control of the operation control unit.

The liquid recovery filling tube 50 has a liquid gas when the compressor 30 automatically recovers the residual gas in the vehicle LPG tank 20 to the recovery tank 10 and recharges the vehicle LPG tank 20. Passing, it is provided with a liquid valve 51 that is automatically opened and closed under the control of the operation control unit.

3 to 6, the operation control unit is a panel formed on one surface of the main body of the residual gas automatic recovery and recharging device, and determines an operation state of automatic recovery and recharging of residual gas in the vehicle LPG tank 20. Power switch 61, first and second display sections 62 and 63, pressure setting function selection switch 64, pressure setting switch 65, recovery switch 66, recharge switch 67, system control unit 68, of course, includes a power supply 69.

When the power switch 61 is turned on and off, the main power is supplied to the power supply unit 69 so that the gas recovery and recharging process can be performed when the power switch 61 is turned on. Only power is supplied.

The first display portion 62 displays the pressure value of the first pressure sensor 41a when the power switch 61 is turned on, and the second display portion 63 displays the pressure value when the power switch 61 is turned on. And displays the pressure value of the second pressure sensor 42a.

Referring to FIG. 4, the pressure setting function selection switch 64 is configured to give a function of setting an automatic stop pressure of the compressor 30 and a restart pressure when the power switch 61 is turned on.

Referring to FIG. 4, the pressure setting switch 65 is configured to set the range of the automatic stop pressure and the restarting pressure difference selected by the pressure setting function selection switch 64 when the power switch 61 is turned on.

That is, when the power setting switch 61 is turned on, the pressure setting function selection switch 64 is pressed first, and the second display unit 63 does not display the pressure of the vehicle LPG tank 20, but the automatic stop pressure ( Stop pressure) mode is selected, and each time the pressure setting switch 65 is pressed, the first display unit 62 displays the automatic stop pressure of the compressor 10 in units of 0.1 MpaAbs.

Thereafter, when the pressure setting switch 65 is pressed for the second time, the stop pressure set by the pressure setting switch 65 is stored in the program of the system controller 68, and at the same time, the system controller 68 recovers gas. And return the recharging device to the standby mode.

On the other hand, when the pressure setting switch 65 is pressed for the third time, a mode for restarting pressure differential setting function is selected, and each time the pressure setting switch 65 is pressed next, the first display unit 62 displays the compressor 10. The restart pressure difference is expressed in units of 0.05 Mpa.

Thereafter, when the pressure setting switch 65 is pressed for the fourth time, the restart pressure difference set by the pressure setting switch 65 is stored in the program of the system controller 68, and at the same time, the system controller 68 recovers gas. And return the recharging device to the standby mode.

The recovery switch 66 is configured to generate a signal for starting the recovery process for the residual gas of the vehicle LPG tank 20 when the power switch 61 is input and then output the signal to the system controller 68. .

The recharge switch 67 is configured to generate a signal for the start of the recharging process for the residual gas to the vehicle LPG tank 20 upon input of the power switch 61 and then output it to the system controller 68. .

The system control unit 68 is configured in a printed circuit board (PCB) configured in an operation control unit forming a panel, which is the compressor (30), the first, third, two, four, five solenoid valve (43a) (44a) 45a, 46a, 47a, the liquid valve 51, the switches 61, 64, 65, 66, 67, and the first and second display parts 62, 63 and the circuits described above. Is connected as an enemy.

At this time, the system control unit 68, as well as the drive of the compressor 30 from the pressing operation of the switches 61, 64, 65, 66, 67, as well as the connecting pipe and the liquid recovery filling pipe ( The flow path for recovering and refilling the residual gas is changed by automatically controlling opening and closing of the first to fifth solenoid valves 43a, 44a, 45a, 46a, 47a and the liquid valve 51 provided in the 50). In addition, the program of the safe operation function is mounted.

That is, the system controller 68 automatically stops the operation state of the compressor when the discharge pressure of the compressor 30 sensed by the first pressure sensor 41a in the input state of the power switch 61 is 0.9 MpaAbs, When the stop pressure of 0.2MpaAbs is lowered, the safe restart function is automatically restarted, and when the pressure of the compressor 30 sensed by the first pressure sensor 41a is 1.1 MpaAbs or more, the abnormal pressure rise is determined. The operation state is stopped, and the operation stop state is loaded with a safe operation function which is restarted by a reset and a safety function in which a switch of another process is not operated while a residual gas recovery process or a recharge process is in progress.

At this time, the stop pressure is preferably set in units of 0.1 MpaAbs, but is not necessarily limited to this, the range of the stop pressure can be set arbitrarily.

In addition, the pressure difference required for restarting is preferably set in units of 0.05 Mpa as 0.2, 0.15, 0.1 Mpa, but is not necessarily limited thereto, and the range of the pressure difference can be arbitrarily set.

In addition, the reset is performed by the procedure of closing the power switch 61 and then turning it back on.

In addition, the operation controller outputs an alarm sound output unit 70 that outputs an alarm sound through the control of the system controller 68 when the pressure of the compressor 30 detected from the first pressure sensor 41a exceeds 1.1 MpaAbs. It further comprises a), when the alarm sound is output by the alarm sound output unit 70, the system control unit 68 is configured to stop the compressor (30).

The power supply unit 69 is connected to the power cord 69a, and is configured to supply power required for automatic recovery and recharging of gas.

Referring to Figures 1 to 6 attached to the operation of an embodiment of the present invention configured as described above are as follows.

First, when the residual gas automatic recovery and filling device according to an embodiment of the present invention needs to repair the vehicle LPG tank 20 as a defect occurs in the accessory device of the vehicle LPG tank 20, the recovery tank 10 and In a state in which the vehicle LPG tank 20 is connected, the gas in the vehicle LPG tank 20 is recovered to the recovery tank 10 and when the maintenance work of the vehicle LPG tank 20 is completed, the recovery tank 10 ) Gas is used to recharge the vehicle LPG tank (20).

That is, when recovering gas from the vehicle LPG tank 20 to the recovery tank 10, one end of the liquid recovery filling pipe 50 is connected to the third pipe 21 of the vehicle LPG tank 20, and the vehicle LPG A second tank connecting pipe 42 having a second pressure sensor 42a is connected to the fourth pipe 22 of the tank 20.

The other end of the liquid recovery filling tube 50 is provided with a first pressure sensor 41a in the first pipe 11 of the recovery tank 10 and the second pipe 12 of the recovery tank 10. The first tank connecting pipe 41 is connected.

At this time, the first tank connecting pipe 41 branches the first and second connecting pipes 43 and 44 to connect to the fifth and sixth pipes 31 and 32 of the compressor 30, and the first A third connecting pipe 45 branched from the second tank connecting pipe 42 is connected to the connecting pipe 43, and a fourth branching pipe from the second tank connecting pipe 42 is connected to the second connecting pipe 44. The connecting pipe 46 is connected, and the air valve 47 is branched to the third and fourth connecting pipes 45 and 46.

Thereafter, the power switch 61 configured in the operation control unit is input to press the recovery switch 66 to recover the gas in the vehicle LPG tank 20 to the recovery tank 10 in which the gas gas is stored.

Then, the system control unit 68 in the operation control unit checks the pressure of the first and second pressure sensors 41a and 42a provided in the first and second tank connecting pipes 41 and 42.

At this time, when the pressure TP of the recovery tank 10 is higher than the pressure CP of the vehicle LPG tank 20 (TP> CP), the system controller 68 is connected to the first and third connections. The first and second solenoid valves 43a and 45a provided in the pipes 43 and 45 are opened.

Then, the recovery tank 10 and the vehicle LPG tank 20 from the opening of the first and second solenoid valves 43a and 45a are connected to the second pipe 12 ↔ the first tank connecting pipe 41 and the first connection. The flow path is formed through the pipe (43) ↔ the third connecting pipe (45) ↔ the second tank connecting pipe (42),

The high pressure in the recovery tank 10 is lowered as it enters the vehicle LPG tank 20 through the flow path, and the pressure drop continues until a uniform pressure is achieved with the vehicle LPG tank 20. CP≥TP)

At this time, the recovery tank 10 and the vehicle LPG tank 20 achieves a pressure equalization (CP≥TP), and the system control unit 68 closes the second solenoid valve 45a. 4 The solenoid valves 43a and 46a and the liquid valve 51 are opened and the compressor 30 is driven.

Then, as shown in FIG. 1, the gas gas in the recovery tank 10 passes through the second pipe 12 → the first tank connecting pipe 41 → the first connecting pipe 43 → the fifth pipe 31. Guided to the compressor 30 through the dotted arrow direction of Figure 1,

The compressor 30 compresses the gas introduced therein and passes the compressed gas through the sixth pipe 32 → the fourth connecting pipe 46 → the second tank connecting pipe 42 → the fourth pipe 22. It is supplied to the vehicle LPG tank 20 through (in the dotted arrow direction of Figure 1).

Then, the pressure of the recovery tank 10 is lowered and the pressure of the vehicle LPG tank 20 is increased, a pressure difference is generated between the recovery tank 10 and the vehicle LPG tank 20, and due to the pressure difference The liquid gas of the LPG tank 20 is pushed to the liquid recovery filling tube 50 through the third pipe 21, the liquid gas is pushed liquid valve 51 provided in the liquid recovery filling tube (50) By being pushed into the recovery tank 10 through the first pipe 11 through, the liquid gas in the vehicle LPG tank 20 is to be forced recovery to the recovery tank (10).

At this time, all the liquid gas in the vehicle LPG tank 20 is recovered to the recovery tank 10, the resistance is lost due to the liquid in the liquid transfer line, when the gas passes through the two tanks are rapidly equalized, the recovery tank ( If the pressure TP of 10) is greater than or equal to the pressure CP of the vehicle LPG tank 20 (TP ≥ CP), after a predetermined time has elapsed (about 2 minutes), the system control unit 68 performs the first and fourth operations. The solenoid valves 43a and 46a and the liquid valve 51 are closed to open the second and third solenoid valves 45a and 44a.

Then, the recovery process for the gaseous gas in the vehicle LPG tank 20 proceeds from the opening of the second and third solenoid valves 45a and 44a.

That is, in the state in which the second and third solenoid valves 45a and 44a are opened, the compressor body in the vehicle LPG tank 20 is completely recovered and further changed to a vacuum state so that the second pressure sensor (0.07 MpaAbs) is set to a vacuum degree. 42a), the detected pressure change is notified to the system control unit 68. The system control unit 68 determines that the gas recovery process is finished and the second and third solenoid valves 45a and 44a. ), The drive of the compressor 30 is stopped, and the fourth and fifth solenoid valves 46a and 47a are opened.

Then, air is introduced and diluted from the fourth and fifth solenoid valves 46a and 47a through the vacuum valve 47 having the fifth solenoid valve 47a into the vehicle LPG tank 20 in the vacuum state. do.

Here, when the pressure of the vehicle LPG tank 20 rises to 0.1 MpaAbs (atmospheric pressure) in the state where the gas gas to the recovery tank 10 is completely recovered, the pressure is detected by the second pressure sensor 42a. After that, it is transmitted to the system control unit 68.

Then, the system control unit 68 closes the fourth and fifth solenoid valves 46a and 47a and ends the automatic recovery process of the gas.

On the other hand, when the maintenance work is completed to recharge the gas in the vehicle LPG tank 20, first the vehicle LPG tank 20 is exposed to the atmosphere during the maintenance process to discharge the air present in the vehicle LPG tank 20 The system controller 68 opens the second and fifth solenoid valves 45a and 47a and drives the compressor 30 at the same time.

Then, the second and fifth solenoid valves 45a and 47a are opened, and the air in the atmospheric pressure in the vehicle LPG tank 20 is driven by the compressor 30 to provide the fifth solenoid valve 47a. It is discharged into the atmosphere through an air valve 47.

At this time, when the vacuum pressure in the vehicle LPG tank 20 reaches 0.07 MpaAbs, which is the set vacuum degree, the system control unit 68 closes the second and fifth solenoid valves 45a and 47a to stop the air discharge operation. At the same time, the liquid valve 51 provided in the liquid recovery filling tube 50 is opened.

Then, when the liquid valve 51 is opened, the liquid gas in the recovery tank 10 flows from the first pipe 11 to the liquid recovery filling tube (the dotted line arrow in FIG. 2) due to the pressure difference. 50) is recharged into the vehicle LPG tank 20 through the third pipe (21).

That is, when the liquid valve 51 of the liquid recovery filling tube 50 is opened, the internal pressure of the liquid recovery filling tube 50 is relatively higher than the internal pressure (vacuum pressure) of the vehicle LPG tank 20. Naturally, the liquid gas of the recovery tank 10 is supplied to the vehicle LPG tank 20, so that the liquid gas refilling operation of the vehicle LPG tank 20 can be easily performed.

At this time, when the pressure detection values of the first and second pressure sensors 41a and 42a are the same, that is, when the pressure TP in the recovery tank 10 and the pressure CP in the vehicle LPG tank 20 are the same. (TP = CP), the system control unit 68 opens the second and third solenoid valves 45a and 44a and simultaneously drives the compressor 30.

Then, from the driving of the compressor 30, the fourth pipe 22 → the second tank connecting pipe 42 → the third connecting pipe 46 → the fifth pipe, which is the flow path of FIG. 2 (in the solid arrow direction of FIG. 2). (31) → compressor (30) → sixth piping (32) → second connecting pipe (44) → first tank connecting pipe (41) → second pipe (22) of the LPG tank (20) Gas gas is injected into the recovery tank to completely refill the liquid gas in the recovery tank with the LPG tank for vehicles.

Here, when the same state as the pressure (TP) of the recovery tank 10 and the pressure (CP) of the vehicle LPG tank 20 during the process as described above more than a predetermined time (about 2 minutes) has elapsed the system control unit ( 68 closes the second and third solenoid valves 45a and 44a and the liquid valve 51, stops the drive of the compressor 30, and ends the automatic refilling process of the liquid and gas.

In addition, the system controller 68 generates an alarm sound through the control of the alarm sound generator 70 to inform the operator that the automatic refilling of liquid and gas gas to the vehicle LPG tank 20 is completed.

On the other hand, Figure 6 is a screen of the state of initializing the first and second pressure sensors (41a, 42a) to look at this in more detail, first the power switch 61 is put into the first and second pressure sensors (41a) 1,2,3,4 connector pipe branched from the first and second tank connection pipes (41, 42), as well as the first and second tank connection pipes (41, 42) with 42) (43) (44) (45) (46) and the air pipe (47) and solenoid valves (43a) (44a) (45a) (46a) (47a) are opened to open all of the above pipes in the atmosphere.

Thereafter, when the recovery switch 66 and the recharge switch 67 are simultaneously pressed for a predetermined time (about 5 seconds), the pressure display first display portion 62 of the recovery tank 10 as shown in FIG. "gn" is displayed, and "good" is displayed on the pressure display second display portion 63 of the vehicle LPG tank 20 for a predetermined time (about 3 seconds). 41a and 42a may be switched to the standby mode in the initialization state.

On the other hand, Figure 7 is a pressure regulator 81 and zero on the suction side of the compressor 30, so that it is possible to utilize a general type air compressor that can not use the pressure of the gas as a function of the vacuum pump using the pressure of the compressed gas. The state in which the pressure compensator 82 is connected is shown.

That is, the pressure regulator 81 is a pressure control valve that is automatically adjusted by the system control unit 68 to adjust the pressure of the compressed gas when the compressed gas having a pressure on the suction side is driven by the drive of the compressor 30 The zero pressure correcting device 82 is a control valve which is opened to pass gas only when the pressure of the compressed gas regulated by the pressure regulator 81 is below atmospheric pressure, and the pressure regulator 81 and zero pressure are The correction device 82 allows the general air compressor to perform the function of the vacuum pump as well as the suction of the pressurized gas.

As described above, the residual gas automatic recovery and recharging apparatus of the present invention is configured as a vacuum pump, and the compressor is configured to be able to compress the inhaled vacuum gas at a high pressure, and then the gas compressor and the recovery tank and the LPG tank for the vehicle. By configuring the connection through each of the connection pipes provided with an open and close solenoid valve, when the vehicle LPG tank is repaired, the residual gas of the vehicle LPG tank is completely recovered without external discharge, and the vehicle tank to be repaired is vacuumed and diluted with air. The energy of the gas generated during the maintenance work of the LPG tank for the vehicle can be secured by the operator, and the liquid gas recovered after the maintenance work can be automatically refilled more easily with the vehicle LPG tank. Prevents loss and prevents accidents caused by gas during maintenance There.

In particular, auto mechanics using this device have little knowledge about high-pressure gas, so complicated operation of the device can cause other accidents.

The present invention is not limited to the above-described specific preferred embodiments, and various modifications can be made by any person having ordinary skill in the art without departing from the gist of the present invention claimed in the claims. Of course, such changes are within the scope of the claims.

Claims (5)

Recovery tank provided with the first and second piping; A vehicle LPG tank having third and fourth pipes and remaining liquid and gas gas; A compressor having fifth and sixth suction and discharge pipes connected to the recovery tank and the vehicle LPG tank, and converting the vehicle LPG tank into a vacuum state; The first and third pipes of the recovery tank and the vehicle LPG tank are connected to each other, and when the vehicle LPG tank is converted into a vacuum state by the compressor, a forced recovery of the recovery tank for residual gas in the vehicle LPG tank and a vehicle LPG tank are performed. A liquid recovery filling tube having a liquid valve to guide refilling of the liquid; An operation control unit for determining an operation state of automatic recovery and recharging of residual gas in the vehicle LPG tank; And, A connecting pipe connecting the recovery tank, the LPG tank, and the compressor to automatically recover residual gas from the vehicle LPG tank to a recovery tank and automatically recharge the LPG tank for the vehicle; Configure The connecting pipe may include a first tank connecting pipe connected to the second pipe, first and second connecting pipes branched from the first tank connecting pipe, and having first and third solenoid valves each of which may be opened and closed, respectively. A second tank connecting pipe connected to the second connecting pipe, a third connecting pipe branched from the second tank connecting pipe and connected to the first connecting pipe, and provided with an open / close-type second solenoid valve, and branched from the second tank connecting pipe. And a fourth connecting pipe connected to the second connecting pipe and provided with an openable fourth solenoid valve, and an air valve connected to the second and fourth connecting pipes and provided with an openable fifth solenoid valve. Residual gas automatic recovery and refilling device for vehicle LPG tank. The method of claim 1, The first tank connection pipe is provided with a first pressure sensor for pressure sensing of the recovery tank, the second tank connection pipe is provided with a second pressure sensor for pressure detection for the vehicle LPG tank. Automatic recovery and refilling device of LPG tank for vehicle. The method of claim 1, wherein the operation control unit, Power switch to turn on / off power for recovery and recharge of residual gas First and second display units displaying a pressure value of the first and second pressure sensors when the power switch is turned on; Pressure setting function selection switch for setting the automatic stop pressure and the restarting pressure difference of the recovery tank when the power switch is shut off, A pressure setting switch for setting the range of the auto stop pressure and the restarting pressure difference selected by the pressure setting function selection switch when the power switch is shut off; Recovery switch for starting the recovery process for the residual gas of the vehicle LPG tank when the power switch is input, Recharging switch for starting the recharging process for the residual gas into the vehicle LPG tank when the power switch is input, Automatic control of the opening and closing of the solenoid valve and the liquid valve provided in the connecting pipe and the liquid recovery filling tube as well as driving the compressor to recover and recharge the residual gas in the vehicle LPG tank from the pressing of the switches. Characterized in that it comprises a system control unit of the program mounted type to Residual gas recovery process or recharging process in progress, the other process switch is equipped with a program of the safe operation function that does not operate, characterized in that the automatic recovery and recharging device of the LPG tank for vehicles. The method of claim 3, wherein the system control unit, When the pressure of the recovery tank detected by the first pressure sensor when the power switch is turned on, the operating pressure of the compressor is automatically stopped when the set pressure is 0.9 MpaAbs. Characterized in that the program is mounted, the stop pressure is set in the unit of 0.1MpaAbs, the pressure difference required for restarting is set in the unit of 0.05Mpa as 0.2, 0.15,0.1MpaAbs, When the pressure of the recovery tank sensed by the first pressure sensor is 1.1 MpaAbs or more, it is determined that the pressure rises to abnormal pressure and is switched to the error mode to stop the operation state of the compressor, and the operation stop state is restarted only by resetting. It is equipped with a program of operation function, and the reset is performed by the procedure of re-insertion after shutting off the power switch, An alarm sound output unit for outputting an alarm sound through the control of a system controller when the pressure of the recovery tank sensed by the first pressure sensor exceeds 1.1 MpaAbs and the recovery or refilling of the residual gas is completed; Residual gas automatic recovery and refilling device for a vehicle LPG tank, characterized in that the configuration further comprises. The suction side of the compressor according to claim 1, Combination of pressure regulator and zero pressure compensator to use general type air compressor that cannot use pressure gas can use compressed gas with pressure and to function as vacuum pump which lowers suction side below atmospheric pressure. Automatic recovery and recharging of residual gas in LPG tanks for vehicles.

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