JP2008256214A - Supply pipe structure for lpg filling device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a supply pipe structure for a LPG filling device, simplified in construction by using a check valve with a built-in back pressure valve for reliable operation, and minimum structural components. <P>SOLUTION: In this pipe structure, a gas separator 4 is arranged and connected to a storage tank 1 for separating bubbles mixed into liquid supplied therefrom from the liquid, and the liquid separated by the gas separator 4 is connected via a flowmeter 5 to a primary side passage 11 of the check valve with the built-in back pressure valve so that the liquid is delivered from a secondary side passage 12 of the check valve. On the other hand, gas separated by the gas separator 4 is returned to the storage tank or released to the atmosphere. Pipes themselves are the required minimum to reduce the size of the whole filling device. Pressure in the pipes is controlled to be predetermined pressure or lower at all times to actualize stable filling operation. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an LPG filling apparatus for filling a predetermined amount of liquefied gas liquid in a preset container, and supplying the LPG filling apparatus using a check valve incorporating a back pressure valve having a simple and compact structure. It relates to the piping structure.

  In general, an LPG filling device that fills a predetermined filling container with a liquid such as a liquefied gas is vaporized by a flow meter or a piping part during filling, and the measurement accuracy is lowered. To prevent this, a back pressure valve is interposed. A predetermined pressure is applied to the pipe to the back pressure valve at all times to prevent vaporization of the liquefied gas. For this purpose, a pipe of a general liquefied gas filling apparatus has a structure as shown in FIG. 5, and the liquid from the storage tank 101 is pumped by a supply pump 103 in the pipe. The pressurized and pressure-fed liquid passes through the flow meter 105 via the gas separator 104 and passes through the vapor pressurization back pressure valve 110 to be supplied. In this vapor pressure back pressure valve, a larger liquid pressure is applied from the primary side passage to the valve body closing the fluid passage by the combined force of the gas pressure in the storage tank 101 and the spring pressure in the back pressure valve. On the other hand, when the pressure rises in the secondary passage, the pipe is damaged, and when the pressure exceeds a predetermined pressure, the valve body is opened. Is opened, and this pressure is released to the primary side.

  FIG. 6 is a simplified LPG filling device whose demand has been increasing in recent years. This is a configuration in which the inside of the storage tank 101 is supplied while being constantly pressurized instead of the supply pump in the piping in the configuration described above. The check valve uses a spring pressurization type check valve 110, so that when the pressurized liquid exceeds a predetermined pressure, the check valve 110 is opened from the primary side passage to supply the liquid, When the secondary passage rises, the relief valve 140 as a back pressure valve is opened, and control is performed so that the pressure in the pipe connected to the secondary passage does not rise above a predetermined pressure.

On the other hand, instead of the back pressure valve used in these pipes, for example, there is a back pressure valve integrated with a check valve as shown in FIGS. This is shown in Utility Model Registration No. 2539185, and relates to a structure for preventing an abnormal increase in internal pressure in a hot and cold water mixing tap. This is a cylindrical body containing a check valve body 120 that is elastically biased by a check valve spring 124 so that water or hot water is supplied from the primary side passage 111 when the internal pressure of the secondary side passage 112 increases. The cylindrical body moves toward the primary side passage 111 against the repulsive force of the cylindrical body spring 132 mounted on the outer side of the cylindrical body 132, and the valve body 130 is separated from the valve seat to open the relief valve. As a result, the high-pressure water in the secondary side passage 112 passes through the relief valve and the relief passage in the valve-opened state, and is sent to the primary side passage 111 to reduce the internal pressure (for example, , See Patent Document 1).
Utility Model Registration No. 2539185 (FIGS. 1 and 2)

  As described above, the LPG filling device using the vapor pressure back pressure valve, the spring pressure check valve and the relief valve as the back pressure valve is required to use the vapor pressure in the storage tank, on the other hand, Since the increase in the internal pressure of the secondary passage is prevented from exceeding a certain level via the relief valve, extra piping is required for this purpose, and the piping is complicated. In order to simplify the piping, it is desired to change the back pressure valve. When the back pressure valve shown in FIGS. 7 and 8 is used as it is, a high cracking pressure (valve) is used as the back pressure valve. In order to realize this, the load of the check valve spring that presses the check valve body against the valve seat surface of the cylinder is increased and the check valve spring It is necessary to make the spring constant as small as possible in order to prevent the load from increasing suddenly and to stabilize the flow characteristics. However, in such a back pressure valve integrated with the conventional check valve, the diameter and length of the check valve spring cannot be obtained sufficiently, and in order to obtain a sufficient diameter and length, the entire valve structure is increased. There is a need to do that. In addition, the cylindrical body is inevitably enlarged, and as a result, the entire size is increased. In addition, if the valve with such a configuration is used as it is, the thickness of the cylinder may be too thin to withstand the pressure sufficiently. Problems such as inability to reduce the size have arisen.

  The object of the present invention is to solve the above-mentioned problems and to provide a simplified LPG filling apparatus using a check valve incorporating a back pressure valve that has a simple configuration, a minimum number of components, and a reliable operation. To obtain a supply piping structure.

  An object of the present invention is to mix liquid supplied from now on to the storage tank 1 in a supply pipe for supplying a predetermined amount of liquid supplied from the storage tank 1 that is constantly pressurized to a predetermined pressure. A gas separator 4 that separates the air bubbles from the liquid is connected by piping, and the liquid separated by the gas separator 4 is connected to the primary passage 11 of the check valve having a built-in back pressure valve through the flow meter 5; The liquid is delivered from the secondary side passage 12 of the check valve, and the back pressure valve is closed when the pressure in the primary side passage 11 is high and is opened when the pressure in the secondary side passage 12 is high. On the other hand, a supply piping structure in an LPG filling device in which the gas separated by the gas separator 4 is returned to the storage tank 1 or connected to the atmosphere so as to be released to the atmosphere. It is achieved.

  Further, the purpose of the present invention is to provide a back valve that can be reciprocated in the check valve body 20 when the pressure in the pipe in which the check valve in the above configuration is connected to the secondary passage 12 rises above a predetermined pressure. Since the back pressure valve body 30 of the pressure valve is opened so that the pressure of the secondary side passage 12 escapes to the primary side passage 11, no extra piping is required, and the entire filling device can be downsized. Become.

  As described above, the present invention incorporates the check valve body 20 including the back pressure valve body 30 configured to close the communication hole 26 when the pressure on the primary side passage side is high and to open when the pressure on the secondary side passage side becomes high. Since the supply piping structure uses a check valve constructed from the above, there is no need to use vapor pressure or a relief valve, so there is no need for extra piping, and using this greatly contributes to downsizing of the filling device can do. In addition, a gas separator 4 for separating bubbles mixed in the liquid supplied from the storage tank 1 from the liquid is connected to the storage tank 1 by piping, and the separated liquid is supplied to the primary check valve via the flow meter 5. Connected to the side passage 11, and the liquid is sent out from the secondary side passage 12 of the check valve, while the gas separated by the gas separator 4 is returned to the storage tank 1 or released into the atmosphere. Therefore, this piping itself becomes the minimum necessary, and the entire filling device is miniaturized. Furthermore, each time the pressure in the secondary side passage 12 rises above a predetermined pressure, the built-in back pressure valve opens and the pressure in the secondary side passage 12 escapes to the primary side passage 11. For this reason, the pressure in the pipe is always controlled to be equal to or lower than the predetermined pressure, and a specific effect such as a pipe structure that can obtain a stable filling operation is obtained.

  Hereinafter, embodiments of the present invention will be described with reference to FIGS. In FIG. 2, 10 is a casing having a primary side passage 11 as an inlet to which pressurized liquid such as liquefied gas is supplied at one end and a secondary side passage 12 as an outlet to which pressurized liquid is delivered to the other end. . This casing is composed of a casing main body 13, a casing lid 14 that is inserted and fixed at both ends of the casing main body 13, and a casing bottom 15, and a cylindrical inner surface through hole 16 is formed in the casing main body 13. At both ends of the casing body 13, the inlet side is closed by a casing lid 14, and the outlet side is closed by a casing bottom 15. The casing cover 14 and the casing bottom 15 are connected to the second supply pipe 7 serving as the primary passage 11 and the third supply pipe 8 serving as the secondary passage 12, respectively. And the casing bottom 15 are fitted with a sealing material 17 so that the liquid inside does not leak, and the casing body 13, the casing lid 14, and the casing bottom 15 are fastened and fixed by screw parts 18. Yes.

  A check valve body 20 having a valve seat 21 that can be in close contact with the outer peripheral end surface of the primary passage 11 and close the primary passage 11 is disposed on the center line in the casing 10. On the outer periphery of the check valve body 20, a plurality of grooves 22 serving as a liquid passage are formed in the axial direction. The check valve body 20 is elastically biased toward the casing lid by a first spring 24 disposed between the check valve body 20 and a first stopper member 23 having a T-shaped cross section located on the bottom side of the casing. The member 23 is supported by the casing bottom 15. A plurality of flow passages 25 are formed at equal intervals on the outer peripheral side of the first stopper member 23, and liquid passes when the check valve body 20 is opened from the primary side passage 11 by a predetermined pressure. Thus, the secondary side passage 12 is supplied.

  Further, a stepped hole is formed on the center line of the check valve body 20, and a thin communication hole 26 constituting the stepped hole is located on the secondary passage side. The communication hole 26 is followed by a valve guide hole 27 larger than this, and a bottomed cylindrical back pressure valve body 30 having a U-shaped cross section that reciprocates in the hole 27 has an outer periphery and It is built in with a gap through which the liquid can pass between the valve guide hole 27. The back pressure valve body 30 is elastically urged so as to always close the communication hole 26 by a second spring 32 having one end positioned on a second stopper member 31 fixed to the primary passage side. A plurality of flow paths 33 are also formed at equal intervals on the outer peripheral side of the second stopper member 31.

  FIG. 1 shows a configuration in which the check valve including the back pressure valve thus configured is used in the supply piping structure of the LPG filling device. Next, the supply pipe structure will be described. A storage tank 1 that is constantly pressurized to a predetermined pressure has a first supply pipe 2 connected to the bottom thereof, which is connected via a supply valve 3. The gas separator 4 is connected. This gas separator 4 separates bubbles mixed in the supplied liquid from the liquid, and is necessary for accurately measuring the flow rate of the liquid with the flow meter 5 connected to the gas separator 4 by piping. It is a thing. The gas separator 4 is connected to the storage tank 1 through an exhaust pipe 6 and branched to be released into the atmosphere. The gas in the bubbles separated by the gas separator 4 is exhausted from the exhaust pipe 6. It is returned to the storage tank 1 via or through the atmosphere.

  On the other hand, the flow meter 5 is connected to the primary side passage 11 of the check valve containing the back pressure valve shown in FIG. 2 via the second supply pipe 7. Is connected to a third supply pipe 8 for supplying a predetermined amount of liquid to a filling container (not shown). The third supply pipe 8 has a structure in which a liquid supply nozzle (not shown) is connected via an electromagnetic valve 9 that operates to shut off the supply when the filling amount reaches a set amount.

  In such a configuration, when a start signal is input and a pressurized liquid is supplied from the storage tank 1, the liquid passes through the gas separator 4 from the first supply pipe 2 and passes through the flow meter 5. At this time, the supply amount is measured by the flow meter 5. Subsequently, since the liquid flows in a state where a predetermined pressure is applied, as shown in FIG. 3, the back pressure valve body 30 abuts against the seat surface of the valve guide hole 27 and at the same time the first spring 24 is bent, The check valve body 20 is opened and the liquid flows from the primary side passage 11 to the secondary side passage 12. In this state, the back pressure valve body 30 is not opened and the communication hole 26 remains closed, so that the liquid flows around the check valve body 20. Thereafter, when a predetermined amount of liquid is supplied and the filling container is filled, a stop signal is input to the electromagnetic valve 9 and the supply of the liquid is shut off. Subsequently, when filling the next filling container with a liquid, when a start signal is input and the electromagnetic valve 9 is opened, a predetermined amount of liquid is supplied by the same operation.

  On the other hand, if the pressure in the secondary passage 12 rises above a predetermined pressure during the supply for some reason, the check valve body 20 abuts against the peripheral end face of the primary passage 11 and closes at the same time. This rising pressure acts on the back pressure valve body 30 and, as shown in FIG. 4, the back pressure valve body 30 moves backward against the second spring 32, so that the communication hole 26 is opened. As a result, the pressure escapes from the secondary side passage 12 to the primary side passage 11, so the pressure in the secondary side passage 12 decreases. In this way, even if the pressure in the secondary side passage 12 is repeated, the back pressure valve body 30 is opened each time. Therefore, the secondary side passage 12 is pressure-reduced each time, and the supply pipe is not broken, and it is safe. Work becomes possible.

It is a schematic block diagram which shows embodiment of this invention. It is sectional drawing which shows the non-return valve which concerns on this invention. It is sectional drawing which shows the open state of the non-return valve in this invention. It is sectional drawing which shows the open state of the back pressure valve in this invention. It is the schematic which shows piping of a prior art example. It is the schematic which shows the piping of another prior art example. It is sectional drawing which shows the prior art example of a check valve. It is sectional drawing which shows the operation state of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Storage tank 2 1st supply pipe 3 Supply valve 4 Gas separator 5 Flowmeter 6 Exhaust pipe 7 2nd supply pipe 8 3rd supply pipe 9 Solenoid valve 10 Casing 11 Primary side passage 12 Secondary side passage 13 Casing main body 14 Casing lid DESCRIPTION OF SYMBOLS 15 Casing bottom 16 Through-hole 17 Sealing material 18 Screw part 20 Check valve body 21 Valve seat 22 Groove 23 1st stopper member 24 1st spring 25 Flow path 26 Communication hole 27 Valve guide hole 30 Back pressure valve body 31 2nd stopper member 32 Second spring 33 Flow path

Claims (2)

In a supply pipe for supplying a predetermined amount of liquid supplied from a storage tank (1) that is constantly pressurized to a predetermined pressure,
A gas separator (4) for separating bubbles mixed in the liquid to be supplied to the storage tank from the liquid is connected by piping, and the back pressure valve is built in via the flow meter (5) for the liquid separated by the gas separator. The check valve is connected to the primary side passage, and the liquid is sent out from the secondary side passage of the check valve, and the back pressure valve is closed when the pressure in the primary side passage is high and the secondary side passage Supply pipe in an LPG filling apparatus characterized in that it is configured to be opened when the pressure in the side passage becomes high, and on the other hand, the gas separated by the gas separator is connected to the storage tank or piped so as to be released into the atmosphere. Construction.   When the pressure in the pipe connected to the secondary passage rises above a predetermined pressure, the check valve is a back pressure valve body (30) of a back pressure valve that is built in the check valve body (20) so as to be able to reciprocate. 2. The supply piping structure in the LPG filling apparatus according to claim 1, wherein the opening operation is performed so that the pressure in the secondary side passage escapes to the primary side passage.

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