JP2007332989A - Liquefied gas feeder - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To satbly control supply of liquified gas by using a part of an injection pipe for vapor generation, separately from a storage tank. <P>SOLUTION: The lengthy injection pipe 7 is provided between the storage tank 1 and a supply valve 15, and a partition valve 11 for partitioning the injection pipe 7 into a piping part 8 for vapor generation on the upstream side and a piping part 10 for discharge on the downstream side is provided in the middle thereof. The piping part 8 for vapor generation is provided with a heating pipe 22 for heating inside liquified gas to generate vapor. The piping part 10 for discharge is provided with a cooling pipe 23 for cooling the inside liquified gas to lower the temperature. When the partition valve 11 is opened, vapor generated in the piping part 8 for vapor generation and collected into a vapor storage part 9 is circulated in the piping part 10 for discharge as pressurizing gas, and the liquified gas in the piping part 10 for discharge is pushed out toward the supply valve 15 side by the gas pressure. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a liquefied gas supply device suitably used for supplying a liquefied gas such as propane, butane, dimethyl ether (DME) or the like to a liquefied gas container for home use or on-vehicle use.

  Generally, liquefied gas used as fuel for household or automobile is stored in a large storage tank. And, as a method of supplying liquefied gas from this storage tank to a liquefied gas container for home use or on-vehicle use (a small cylinder at a supply destination), for example, a method using a liquid feed pump or the like, and a gas exclusively used for pressurization (hereinafter referred to as a gas pressurizer) , Referred to as pressurized gas).

  In this case, the method of using a liquid feed pump or the like for supplying liquefied gas is required to secure a large space in the liquefied gas supply facility due to the necessity of safe operation of the facility due to restrictions of the High Pressure Gas Safety Law. The This not only increases the size of the entire facility, but also increases construction costs.

  On the other hand, in the method of supplying liquefied gas using pressurized gas, when the liquefied gas is discharged from the storage tank to the outside, the liquefied gas is temporarily stretched into a small discharge container and accommodated. When the liquefied gas is supplied from the container to the supply destination cylinder or the like, the inside of the discharge container is pressurized with the pressurized gas and the liquefied gas is sent out.

  And this kind of liquefied gas supply device according to the prior art uses, for example, propane gas that is easier to vaporize (evaporate) than the liquefied gas to be supplied as the pressurized gas for pressurizing the inside of the dispensing container (for example, Patent Document 1) and those using nonflammable gases such as nitrogen gas and helium gas (for example, refer to Patent Document 2).

  As another method, the liquefied gas storage tank is heated from the outside using a heating medium, and the pressure in the storage tank is maintained at a higher pressure than the supply cylinder, thereby utilizing the pressure difference between the two. There are also known devices that supply liquefied gas (see, for example, Patent Document 3).

JP 2002-181291 A JP 2002-195494 A JP 2004-245279 A

  By the way, in the prior art by patent document 1 mentioned above, it is necessary to provide the storage tank for pressurized gas which stores pressurized gas, such as propane gas, for example as a large sized tank separately from the storage tank which stores liquefied gas. Yes, the entire equipment will be enlarged. In addition, since it is necessary to periodically replenish the pressurized gas in the storage tank for pressurized gas, there is a problem that work for replenishing the pressurized gas takes time and workability during maintenance is reduced. .

  In addition, in the other conventional technique according to Patent Document 2, in order to store a noncombustible gas for pressurization such as nitrogen gas and helium gas, it is necessary to separately provide a storage tank for the noncombustible gas for pressurization. The tank must be appropriately replenished with non-combustible gas for pressurization. For this reason, even in other conventional techniques, there is a problem in that the entire equipment becomes large and workability during maintenance cannot be improved.

  On the other hand, another prior art disclosed in Patent Document 3 is configured to heat a large storage tank from the outside without using a discharge container having a smaller capacity than the storage tank for liquefied gas. For this reason, it is necessary to take heat insulation measures for the large storage tank itself, and there is a problem that the entire facility becomes complicated and large.

  In addition, in this case, the liquefied gas is directly supplied from the storage tank to the on-vehicle container (cylinder) of the automobile. For this reason, an excessive (excess) amount of liquefied gas always remains or is stored in the storage tank. To continue heating such a storage tank, excessive energy is consumed and energy saving is achieved. There is a problem that it becomes an obstacle in trying to make it easier.

  The present invention has been made in view of the above-described problems of the prior art, and an object of the present invention is to heat a part of the liquefied gas by using a part of the piping for generating steam separately from the storage tank. It is an object of the present invention to provide a liquefied gas supply apparatus that can generate steam and stably control the supply of liquefied gas by using the steam as a pressurized gas.

  Another object of the present invention is that a separate container (tank) separate from the storage tank can be dispensed with, so that the entire facility can be reduced in size and energy can be saved, and at the time of maintenance. An object of the present invention is to provide a liquefied gas supply device that can improve the workability of the above.

  Furthermore, another object of the present invention is liquefaction in which heating of the steam generating piping section and cooling of the discharging piping section can be efficiently performed using a heat pump, and energy saving can be realized. The object is to provide a gas supply device.

  In order to solve the above-described problems, the present invention provides a storage tank for storing liquefied gas, and is provided at a position lower than the storage tank when the liquefied gas in the storage tank is discharged to an external supply object. , Applied to a liquefied gas supply device having a supply valve to be closed.

  A feature of the configuration adopted by the invention of claim 1 is that a bottom valve which is opened and closed on the bottom side of the storage tank when the liquefied gas in the storage tank is supplied toward the supply valve side. The bottom valve and the supply valve are connected to each other with a predetermined pipe length, and the liquefied gas in the storage tank is caused by a difference in height between the storage tank and the supply valve. Is provided with a long injection pipe that is injected in a filled state through the bottom valve, and in the middle of the injection pipe, a steam generation pipe section that is located upstream and a discharge pipe that is located downstream A partition valve is provided for partitioning from the piping section for heating, and the liquefied gas in the steam generating piping section is heated with the partition valve closed in the steam generating piping section partitioned by the partition valve. Liquefied gas vapor When a heating means for generating is provided, and a cooling means for lowering the temperature of the liquefied gas in the discharge piping section in the state in which the partition valve is closed is provided in the discharge piping section, and the partition valve is opened. A configuration in which the vapor generated in the steam generating piping section is circulated through the discharging piping section as a pressurized gas to extrude the liquefied gas in the discharging piping section toward the supply valve at a gas pressure. It is to have done.

  According to a second aspect of the present invention, in the steam generating piping part, steam that protrudes upward at a position upstream of the partition valve and accommodates the vapor of the liquefied gas in a confined state. It is set as the structure which provides an accommodating part.

  Further, according to the invention of claim 3, between the steam generating piping portion and the discharging piping portion, the heat medium circulating inside radiates heat by the condensation action at the position of the heat radiating portion, and at the position of the heat absorbing portion. A heat pump that absorbs heat by evaporation is provided, the heating means is constituted by a heat radiating part of the heat pump, and the cooling means is constituted by a heat absorbing part of the heat pump.

  Further, according to the invention of claim 4, the heat absorption part of the heat pump is in contact with the outside air separately from the first heat absorber which is provided in the discharge pipe part and constitutes the cooling means. The first and second heat absorbers are selectively switched and connected to the heat radiating part of the heat pump.

  As described above, according to the first aspect of the present invention, the liquefied gas is filled in the injection pipe connecting the storage tank and the supply valve using the height difference, and the steam generating piping section and the dispensing piping section are used. When the liquefied gas in the steam generating piping section is heated by the heating means in a state where the space is partitioned into the upper and lower portions by closing the partition valve, the vapor of the liquefied gas can be generated in the piping section. . Further, in the dispensing pipe portion, the internal liquefied gas can be cooled using the cooling means to lower the temperature. When the gate valve is opened in this state, the steam generated in the steam generating piping section flows out into the discharging piping section, and the liquefaction of the discharging piping section is caused by the vapor pressure (pressurized gas) at this time. Gas can be discharged from a supply valve to a cylinder (for example, a liquefied gas container for home use or on-vehicle use) that is a supply object, and supply control of liquefied gas using a steam generation piping section and a discharge piping section Can be performed stably.

  For this reason, there is no need to use a separate pressurized gas (eg, propane gas, nitrogen gas, helium gas, etc.) as in the prior art, and a tank for replenishing the pressurized gas can be eliminated. It is possible to improve the workability at the time of maintenance. In addition, since it is only necessary to heat a part of the injection pipe (steam generation pipe) instead of the storage tank, heat insulation measures can be simplified, and the liquefied gas can be saved without excessive evaporation. Energy can be achieved.

  According to the invention described in claim 2, the steam generating pipe that protrudes upward at a position upstream of the partition valve and stores the vapor of the liquefied gas in a confined state inside the steam generating piping section. It is set as the structure which provides. For this reason, after injecting the liquefied gas into the steam generation piping section and the discharge piping section of the injection pipe and then closing the partition valve, the liquefaction generated in the steam generation piping section due to the heating of the heating means. Gas vapor can be accommodated in the vapor accommodating portion in a pressurized state. After that, when the gate valve is opened, the liquefied gas in the discharge pipe section is supplied from the supply valve using the pressure of the steam (pressurized gas) stored in the steam generation pipe section and the steam storage section. It is possible to efficiently transfer (supply) a cylinder or the like as a product.

  In the invention according to claim 3, the heating means on the steam generation pipe part side is constituted by the heat radiating part of the heat pump, and the cooling means on the discharge pipe part side is constituted by the heat absorption part of the heat pump. In addition, heating on the steam generation piping section side and cooling on the discharge piping section side can be efficiently performed by, for example, a heat pump using a heat medium such as a refrigerant, and energy saving can be realized. . In addition, by cooling the liquefied gas in the dispensing pipe section, it is possible to efficiently perform the operation of supplying (transferring) the liquefied gas to the cylinder or the like of the supply destination.

  Furthermore, in the invention according to claim 4, the heat absorption part of the heat pump is constituted by the first heat absorber constituting the cooling means on the discharge pipe part side and the second heat absorber provided at a position in contact with the outside air. Since it is configured, for example, the temperature in the discharge pipe section is monitored, and when the temperature of the liquefied gas reaches a predetermined set temperature, the heat radiating section of the heat pump is switched from the first heat absorber to the second heat absorber. In this case, the heat medium (refrigerant) can be evaporated by utilizing the outside air temperature, and the evaporation of the liquefied gas in the steam generating piping part due to the condensing action on the heat radiating part side can be promoted. And when the calorie | heat amount for steam generation by a 1st heat absorber is insufficient, external air can be utilized as a heat source with a 2nd heat absorber. As a result, the liquefied gas in the discharge piping section can be prevented from being cooled excessively, and when the liquefied gas is supplied from the discharge piping section to the supply cylinder, the liquefied gas is excessively filled in the cylinder. It is possible to eliminate problems such as being done.

  Hereinafter, a liquefied gas supply device according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

  Here, FIG. 1 to FIG. 5 show a first embodiment of the present invention. In the figure, 1 is a large storage tank that stores liquefied gas 2, and this storage tank 1 is composed of a sealed container (bulk container) of less than 3 tons that is excellent in pressure resistance and airtightness. For example, a liquefied gas 2 made of a mixture of liquefied butane and liquefied propane is stored as shown in FIGS.

  And the storage tank 1 is installed in the position higher by dimension La (for example, La = 500-700 mm) than the below-mentioned supply valve 15 as shown in FIG. Thereby, the liquefied gas 2 in the storage tank 1 is stretched so as to be filled in an injection pipe 7 to be described later using a height difference (head pressure) corresponding to the dimension La.

  Further, in order to prevent the liquefied gas 2 from being overfilled in the storage tank 1, the liquefied gas 2 is accommodated within a range of 90% or less of the internal volume, for example. Then, a part of the liquefied gas 2 in the storage tank 1 is vaporized (evaporated) and becomes, for example, vaporized propane gas and vaporized butane gas and stays in the upper layer side of the storage tank 1.

  Reference numeral 3 denotes a liquid level sensor provided in the storage tank 1, and the liquid level sensor 3 detects the amount of the liquefied gas 2 stored in the storage tank 1 as, for example, a head pressure. 4 is a pressure gauge provided in the storage tank 1, and the pressure gauge 4 detects the pressure of the liquefied gas 2 accommodated in the storage tank 1 as a gas pressure (gas pressure).

  Reference numeral 5 denotes a joint pipe connected to the bottom of the storage tank 1, and 6 denotes a tension valve as a bottom valve provided on the bottom side of the storage tank 1 via the joint pipe 5. Here, the joint pipe 5 is made of, for example, a pipe joint called an elbow bent in an L shape, and constitutes a part of the storage tank 1. One side (upper end side) of the joint pipe 5 is connected to the bottom of the storage tank 1, and the other side (tip end side) is connected to an injection pipe 7 to be described later via a tension valve 6.

  The tension valve 6 is opened and closed by a control signal from a control device 26 (see FIG. 4) described later. Then, when the tension valve 6 is opened, the liquefied gas 2 in the storage tank 1 is stretched so as to be injected into an injection pipe 7 (a steam generation pipe section 8 and a discharge pipe section 10) described later in a filled state. It is what is included.

  Reference numeral 7 denotes an injection pipe connected to the bottom side of the storage tank 1 via a joint pipe 5 and an extension valve 6, and the injection pipe 7 is predetermined between a supply valve 15 and an extension valve 6 described later. It is composed of a long pipeline (connected pipe) that connects with a long pipe length. That is, the pipe length of the injection pipe 7 is determined in advance so that the liquefied gas 2 of, for example, about 24 to 55 liters can be filled (accommodated) in a portion excluding the vapor storage section 9 described later. .

  Here, the long injection pipe 7 is partitioned so as to be separated into an upstream steam generation pipe section 8 and a downstream discharge pipe section 10 using a partition valve 11 described later. And the piping length 8 (internal capacity) is determined so that the piping part 8 for steam generation can inject (accommodate) the liquefied gas 2 of about 4-5 liters, for example, and the piping part 10 for discharge | emission is 20-50, for example The pipe length (internal volume) is determined so that the liquefied gas 2 of about liter can be injected (accommodated).

  The injection pipe 7 is assembled so as to surround the storage tank 1 in a substantially rectangular frame shape, for example, as shown in FIG. 1, and the middle part of the injection pipe 7 is bent in an L shape at a plurality of locations. It is configured as a structure. As shown in FIG. 2, the injection pipe 7 is installed so as to be inclined obliquely with a height difference of the dimension La between the bottom of the storage tank 1 and the supply valve 15.

  Reference numeral 8 denotes a steam generation pipe portion constituting the upstream side portion of the injection pipe 7. The steam generation pipe portion 8 is connected to the tensioning valve 6 on one side, and the middle portion is substantially U-shaped in the upward and downward directions. The bent pipe part 8A formed by bending the pipe 8A is connected to the other side (upper end) of the bent pipe 8A, and is disposed obliquely in the same manner as the payout pipe part 10 described later. It is comprised by the inclination pipe part 8B.

  And the inclined pipe part 8B of the steam generating pipe part 8 is located below the steam accommodating part 9 described later, and in a direction substantially perpendicular to the bent pipe part 8A as shown in FIG. Oriented. That is, when the piping structure of the injection pipe 7 is described in three dimensions, as shown in FIG. 1, in the X-axis, Y-axis, and Z-axis, the bent pipe portion 8A of the steam generating pipe portion 8 is generally in the X-axis direction. And bent in a substantially U shape in the Z-axis direction. The inclined tube portion 8B extends from the other side of the bent tube portion 8A in the Y-axis direction and is inclined obliquely downward in the Z-axis direction.

  In addition, the steam generating pipe portion 8 is provided with a heating tube 22 (described later) spirally wound around the bent tube portion 8A, for example, and a heat insulating material (not shown) is used on the outside thereof. Insulation is applied. In addition, such a heat insulation process is suitably performed over the full length of the injection pipe 7 including not only the steam generation pipe section 8 but also a discharge pipe section 10 described later.

  Reference numeral 9 denotes a steam accommodating portion provided in addition to the steam generating piping portion 8. The steam accommodating portion 9 is configured by using, for example, a bent pipe bent in an inverted U shape as a whole, and the inclined pipe portion 8B. Projecting upward (Z-axis direction). In this case, the vapor storage unit 9 protrudes upward to a position higher than a later-described liquid level sensor 14, and the upper portion thereof is disposed at a position higher than a predetermined liquid level H1 (see step 3 in FIG. 5) described later. It is what is done.

  And the vapor | steam accommodating part 9 is arrange | positioned in the state raised up from the inclination pipe part 8B, and is connected to the inclination pipe part 8B so that the front and back of the inclination pipe part 8B may be bypassed (bypassing). Thereby, the vapor | steam accommodating part 9 collects and accommodates the vapor | steam of the liquefied gas 2 generated as mentioned later, for example from the bending pipe part 8A of the piping part 8 for vapor | steam generation so that it may contain inside. For this reason, the vapor | steam accommodating part 9 is formed with sufficient capacity | capacitance (pipe length) to accommodate the vapor | steam of the liquefied gas 2. FIG.

  Reference numeral 10 denotes a discharge pipe portion that constitutes a downstream portion of the injection pipe 7, and this discharge pipe portion 10 has one side in the length direction on the other side (downstream side) of the inclined pipe portion 8B via a partition valve 11 described later. )It is connected to the. As shown in FIG. 3, the payout piping unit 10 is installed so that the other side in the length direction (downstream side) extends obliquely to a position of a supply valve 15 described later.

  Here, as shown in FIG. 1, the dispensing pipe portion 10 includes a first inclined pipe portion 10 </ b> A that is inclined obliquely downward from the position of the partition valve 11 and extends in the Y-axis direction, and the first inclined pipe portion. A second inclined pipe portion 10B that is bent in the X-axis direction and inclined obliquely downward from the downstream end of 10A, and is bent in the Y-axis direction and inclined obliquely downward from the downstream end of the second inclined pipe portion 10B. Third inclined tube portion 10C, a fourth inclined tube portion 10D that is bent in the X-axis direction again from the downstream end of the third inclined tube portion 10C and inclined obliquely downward, and the fourth inclined tube portion A fifth inclined pipe portion 10E that is bent again in the Y-axis direction from the downstream end of 10D and inclined obliquely downward, and is bent again in the X-axis direction and inclined obliquely downward from the downstream end of the fifth inclined pipe portion 10E. It is comprised by the inclined 6th inclination pipe part 10F.

  The first to sixth inclined pipe portions 10A to 10F are arranged so as to be inclined obliquely downward as illustrated in FIGS. 1 and 2, and the downstream end of the sixth inclined pipe portion 10F is described later. The supply valve 15 is connected. In addition, for example, the fifth inclined pipe part 10E and the sixth inclined pipe part 10F in the dispensing pipe part 10 are provided with a cooling pipe 23 (described later) spirally wound around the outer periphery thereof, and the outer side thereof. Is subjected to heat treatment using a heat insulating material (not shown).

  A partition valve 11 is provided at an intermediate position of the injection pipe 7. The partition valve 11 is opened and closed by a control signal from a control device 26, which will be described later. When the valve is closed, steam is generated so that the injection pipe 7 is located upstream. It partitions into the piping part 8 for discharge and the piping part 10 for discharge located in the downstream. The gate valve 11 is opened when the injection pipe 7 is filled with the liquefied gas 2 as described later, or when the liquefied gas 2 is discharged, etc. At this time, the upstream side steam generating pipe section 8 and The downstream discharge piping 10 is kept in communication with each other.

  Reference numeral 12 denotes a gas pressure equalization line provided between the downstream side of the dispensing pipe portion 10 (sixth inclined pipe portion 10F) and the storage tank 1, and the gas pressure equalization line 12 is provided at an intermediate portion thereof. By opening the pressure equalizing valve 13, the pressure (gas pressure) in the discharge pipe section 10 and the pressure in the storage tank 1 are made uniform. For example, the vapor of the liquefied gas 2 (vaporized gas) in the discharge pipe section 10. Is to prevent stagnation.

  Here, the pressure equalizing valve 13 is disposed on the upper end side of the storage tank 1, and communicates and shuts off the gas pressure equalizing line 12 and the discharge piping portion 10 with respect to the storage tank 1. For example, when the liquefied gas 2 is discharged from the discharge pipe section 10, the pressure equalization valve 13 is closed in advance, so that the liquefied gas 2 is discharged from the discharge pipe section 10 to the gas pressure equalization line. 12 is prevented from being distributed toward the inside.

  Reference numeral 14 denotes a liquid level sensor provided in the middle of the gas equalizing line 12, and the liquid level sensor 14 is disposed at a height position substantially equal to the bottom of the storage tank 1. When the liquid level sensor 14 fills the injection pipe 7 with the liquefied gas 2 as will be described later with the pressure equalizing valve 13 opened, the liquid level sensor 14 is set in the injection pipe 7 in advance. It is detected whether or not the amount is filled (filled).

  Reference numeral 15 denotes a supply valve that constitutes a discharge supply unit for the liquefied gas 2. The supply valve 15 is connected at its inflow side (one side) to the downstream end of the discharge pipe unit 10 (sixth inclined pipe unit 10F). The outflow side (other side) is connected to a filling nozzle 17 (liquefied gas filling machine) via a transfer filling hose 16 and the like.

  The supply valve 15 supplies the liquefied gas 2 to the cylinder (not shown) of the supply object, which is a liquefied gas container for home use or on-vehicle use, for example, using the transfer filling hose 16 and the filling nozzle 17. At other times, the valve is kept closed. Thereby, the supply valve 15 prevents the liquefied gas 2 in the injection pipe 7 from leaking to the outside (transfer filling hose 16 side) with high safety.

  Reference numeral 18 denotes a pressure sensor provided in the steam container 9, and this pressure sensor 18 is disposed on the upper end side of the steam container 9, and the pressure of the steam stored in the steam container 9 as described later is changed to a gas pressure. (Gas pressure) is detected.

  Reference numeral 19 denotes a temperature sensor provided in the payout piping unit 10, and the temperature sensor 19 is provided, for example, at the downstream end of the sixth inclined pipe portion 10 </ b> F in the payout piping unit 10. The temperature sensor 19 detects (monitors) the temperature of the liquefied gas 2 accommodated in the dispensing pipe section 10.

  Reference numeral 20 denotes a heat pump that serves as a heat source used to generate the vapor of the liquefied gas 2 in the steam generating pipe section 8. The so-called refrigeration cycle is constituted by the heating pipe 22, the cooling pipe 23, the compressor 24, the expansion valve 25, and the like.

  And the circulation path 21 of the heat pump 20 is connected to a first pipe section 21A connecting a compressor 24 and a heating pipe 22 described later, and a first pipe section 21A connecting a heating pipe 22 and an expansion valve 25 described later. The second pipe section 21B, the third pipe section 21C connecting the expansion valve 25 and the cooling pipe 23, and the fourth pipe section 21D connecting the cooling pipe 23 and the compressor 24. It is comprised by.

  Reference numeral 22 denotes a heating tube as a heating means constituting a part of the heat pump 20, and the heating tube 22 is formed by using, for example, a metal tube wound in a spiral shape or a coil shape. As shown by a two-dot chain line inside, it is provided in the bent pipe portion 8A of the steam generating piping portion 8 or the like. The heating tube 22 constitutes a heat radiating portion (heat radiating heat exchanger) of the heat pump 20 disposed on one side of the circulation path 21.

  Here, in the heating tube 22 made of a metal tube, a heat medium compressed by using a compressor 24 described later circulates to promote heat generation (generation of condensation heat) due to the condensing action of the heat medium. As a result, the heating pipe 22 heats the liquefied gas 2 in the steam generating pipe section 8 using heat generated by the heat medium.

  As a result, the temperature of the liquefied gas 2 is increased by, for example, 10 to 20 ° C. in the steam generation pipe portion 8, and the vapor of the liquefied gas 2 is generated. Then, the steam (mixed gas of propane and butane in the liquefied gas 2) generated in the steam generating pipe section 8 is separated from the liquid (liquefied gas 2) and moves upward to enter the steam accommodating section 9. It is collected and stored. The heating tube 22 is not limited to the bent tube portion 8A of the steam generating piping portion 8, but may be provided in the inclined tube portion 8B and the steam accommodating portion 9 as necessary.

  Reference numeral 23 denotes a cooling pipe as a cooling means provided in the discharge pipe section 10, and the cooling pipe 23 constitutes a heat absorption section (heat absorption heat exchanger) of the heat pump 20 provided on the other side of the circulation path 21. Is. Here, the cooling pipe 23 has a metal tube or the like spirally formed on the outer peripheral side of the payout piping part 10 (for example, the inclined pipe parts 10E, 10F, etc.) as illustrated by a two-dot chain line in FIGS. It is configured by winding in a coil shape.

  And in the cooling pipe 23 which consists of a metal tube, the heat medium which became the state which is easy to evaporate (evaporate) using the below-mentioned expansion valve 25 circulates, and promotes the heat absorption by the evaporation effect | action of a heat medium. Thereby, the cooling pipe 23 cools the liquefied gas 2 in the piping part 10 for discharge using the heat absorption of a heat medium.

  Reference numeral 24 denotes a compressor that constitutes a part of the heat pump 20, and the compressor 24 is driven using, for example, an inverter type electric motor (not shown). The compressor 24 compresses a heat medium such as a refrigerant filled in the circulation path 21 of the heat pump 20. Thereby, for example, the heat medium is forcibly circulated (circulated) in the circulation path 21 from the cooling pipe 23 side toward the heating pipe 22 side. And the heat medium discharged from the compressor 24 distribute | circulates the inside of the heating pipe | tube 22 in the state which heated up rapidly.

  Reference numeral 25 denotes an expansion valve that constitutes the heat pump 20 together with the compressor 24. The expansion valve 25 rapidly expands the heat medium that has passed through the heating pipe 22 and is in a condensed (liquid phase) state, thereby The temperature is greatly reduced. For this reason, the low-temperature heat medium cools the liquefied gas 2 in the discharge pipe section 10 while circulating (circulates) in the cooling pipe 23, and changes from the liquid phase to the gas phase by the endothermic action from the liquefied gas 2. It is to be converted.

  Reference numeral 26 denotes a control device constituted by a microcomputer or the like. The control device 26 has an input side connected to the liquid level sensors 3 and 14, the pressure gauge 4, the pressure sensor 18 and the like as shown in FIG. 6, connected to the partition valve 11, the pressure equalizing valve 13, the supply valve 15, the compressor 24 of the heat pump 20, and the like.

  The control device 26 has a storage unit 26A composed of a ROM, a RAM, and the like, and a processing program for controlling the supply of the liquefied gas 2 is stored in the storage unit 26A. And the control apparatus 26 performs the supply control process (dispensing control process) etc. of the liquefied gas 2 according to the process sequence shown as an example in FIG.

  The liquefied gas supply apparatus according to the present embodiment has the above-described configuration. Next, a processing procedure of liquefied gas supply control by the control apparatus 26 will be described with reference to FIG.

  First, when the processing operation is started, the tension valve 6, the partition valve 11, and the pressure equalizing valve 13 are all opened in step 1. As a result, the liquefied gas 2 in the storage tank 1 is stretched so as to be filled in the steam generation pipe portion 8 of the injection pipe 7 using the head pressure (the difference in height of the dimension La), and through the partition valve 11. Thus, the liquefied gas 2 is also filled in the discharge pipe section 10 on the downstream side.

  In this case, even if the vapor of the liquefied gas 2 (vaporized gas) or the like remains in the steam generation pipe portion 8 and the discharge pipe portion 10 of the injection pipe 7, the steam in this case is stored on the other hand. The remaining steam is collected in the section 9 and collected in the storage tank 1 through the gas pressure equalizing line 12 and the pressure equalizing valve 13.

  Next, in step 2, the liquid level of the liquefied gas 2 filled (accommodated) in the steam generation pipe section 8 and the discharge pipe section 10 of the injection pipe 7 is detected as the liquid level H by the liquid level sensor 14. Read like so. In step 3, it is determined whether or not the liquid level H at this time has reached a predetermined liquid level H1. The predetermined liquid level H1 is a liquid level in a state in which the liquefied gas 2 is filled in the steam generating piping section 8 and the discharging piping section 10 until it is filled.

  Here, until the liquid level H in the steam generating pipe section 8 becomes equal to or higher than the predetermined liquid level H1, it is judged as “NO” in Step 3. Therefore, the process proceeds to Step 2 and the liquefied gas 2 is used for generating steam. The operation of stretching into the piping portion 8 and the dispensing piping portion 10 is continued.

  If “YES” is determined in Step 3, the liquefied gas 2 is stretched into the steam generating piping section 8 and the dispensing piping section 10 by a predetermined amount (liquid level H1). In order to stop the tensioning operation, the tensioning valve 6, the partition valve 11, and the pressure equalizing valve 13 are all closed.

  Next, in step 5, the compressor 24 is driven to operate the heat pump 20 illustrated in FIGS. 1 and 3, and a heat medium such as a refrigerant is forcibly circulated in the circulation path 21. Thereby, on the cooling pipe 23 (heat absorption part) side located on one side of the circulation path 21, the liquefied gas 2 in the discharge pipe part 10 is cooled using heat absorption by the evaporation effect of the heat medium.

  In addition, on the heating pipe 22 (heat radiating part) side located on the other side of the circulation path 21, the liquefied gas 2 in the steam generating pipe part 8 is heated by using heat generated by the condensation action of the heat medium, and the liquefied gas is obtained. 2 steam is forcibly generated. Then, the steam (for example, propane gas in the liquefied gas 2) generated in the steam generating piping section 8 is separated from the liquefied gas 2 and moves upward, and is collected in the steam storage section 9. Be contained.

  Therefore, in step 6, the pressure P in the steam storage unit 9 is read by the pressure sensor 18, and the process proceeds to step 7 to determine whether or not the pressure P has reached a predetermined pressure value P1 or more.

  In this case, the pressure value P1 in step 7 may be a pressure value higher than the supply cylinder (internal pressure) by, for example, about 0.05 to 0.15 MPa (megapascal). The pressure value P1 is variably set according to the type of the liquefied gas 2. If the pressure value P1 is set to a higher pressure, the discharge (supply) speed of the liquefied gas 2 to the supply cylinder can be increased.

  Here, when the pressure P in the steam accommodating part 9 becomes equal to or higher than the pressure value P1, the temperature of the liquefied gas 2 in the steam generating pipe part 8 is increased by, for example, 10 to 20 ° C. due to heating. In the part 8, it can be determined that the vapor of the liquefied gas 2 is generated in a predetermined amount or more.

  For this reason, when it determines with "YES" at step 7, it moves to step 8 and stops the drive of the compressor 24, the liquefied gas 2 in the piping part 8 for steam generation is heated more than this, and the liquefied gas 2 This prevents the excessive generation of steam. After that, the process proceeds to step 9 where the discharge control of the liquefied gas 2 is executed.

  That is, in step 9, the dispensing control of the liquefied gas 2 is executed by simultaneously opening the gate valve 11 and the supply valve 15 in the closed state. At this time, the vapor of the liquefied gas 2 generated in the steam generation pipe section 8 and collected in the steam storage section 9 is discharged as the partition valve 11 is opened (inclined pipe sections 10A to 10A). 10F).

  For this reason, the liquefied gas 2 in the dispensing pipe section 10 is pushed out from the supply valve 15 into the transfer filling hose 16 by the vapor pressure (pressurized gas) at this time, and is used for household or in-vehicle use from the filling nozzle 17. It is paid out toward a liquefied gas container (cylinder which is a supply object).

  Then, in the next step 10, it is determined whether or not filling is completed. That is, in step 10, whether or not a predetermined amount of the liquefied gas 2 has been discharged into the supply cylinder is determined by a signal from an external measuring device (not shown) such as a dispenser. If “YES” is determined in step 10, a predetermined amount of the liquefied gas 2 has been discharged (filled) into the supply cylinder, and the process proceeds to the next step 11.

  In step 11, the gate valve 11 and the supply valve 15 that are in an open state are closed, and the discharge control of the liquefied gas 2 is ended (completed). Thereby, discharge | emission (supply) control of the liquefied gas 2 using the piping part 8 for vapor | steam generation of the injection piping 7, the piping part 10 for discharge | emission, etc. can be performed stably.

  Thus, according to the present embodiment, the liquefied gas 2 in the storage tank 1 is stretched so as to be filled in the steam generation pipe portion 8 and the discharge pipe portion 10 of the injection pipe 7 using the head pressure, With the tension valve 6, the partition valve 11 and the pressure equalizing valve 13 all closed, the compressor 24 is driven to operate the heat pump 20, and the liquefied gas 2 in the discharge pipe section 10 is cooled by the cooling pipe 23. In addition, the liquefied gas 2 in the steam generating pipe section 8 is heated by the heating pipe 22.

  Thereby, the vapor | steam of the liquefied gas 2 can be generated in the piping part 8 for vapor | steam generation of the injection | pouring piping 7, and the vapor | steam at this time can be stored so that it may collect in the vapor | steam accommodating part 9. FIG. . And in this state, while opening the partition valve 11 provided between the piping part 8 for steam generation and the piping part 10 for discharge, the supply valve 15 by the side of the transfer-filling hose 16 is opened, so that the inside of the steam accommodating part 9 Using the vapor pressure, the liquefied gas 2 in the dispensing pipe section 10 can be transferred and supplied (supplied) from the supply valve 15 to the supply destination cylinder via the transfer filling hose 16 and the filling nozzle 17.

  That is, the vapor of the liquefied gas 2 generated in the steam generation pipe section 8 is relatively high pressure (for example, a pressure higher than the supply cylinder by about 0.05 to 0.15 MPa) in the steam storage section 9. When the gate valve 11 is opened, the liquefied gas 2 in the discharge pipe section 10 can be pushed out to the supply valve 15 side when the partition valve 11 is opened.

  For this reason, the liquefied gas 2 can be supplied from the delivery pipe section 10 to the supply cylinder through the transfer filling hose 16 by the vapor pressure (pressurized gas) at this time, The discharge (supply) control of the liquefied gas 2 using the pipe portion 8 and the discharge pipe portion 10 can be stably performed.

  Further, the steam accommodating portion 9 protrudes upward from the inclined pipe portion 8B of the steam generating piping portion 8 at a position upstream of the partition valve 11, and the vapor of the liquefied gas 2 is confined therein. It is configured to accommodate.

  For this reason, after injecting the liquefied gas 2 in the storage tank 1 into the steam generating piping section 8 and the dispensing piping section 10 of the injection piping 7 and then closing the partition valve 11, the heating tube of the heat pump 20 The vapor of the liquefied gas 2 generated in the steam generation pipe section 8 by heating using the pressure 22 can be stored in the steam storage section 9 in a pressurized state, and the pressure in the steam generation pipe section 8 is excessive. It can be suppressed by the steam accommodating portion 9.

  When the gate valve 11 is subsequently opened between the steam generation pipe section 8 and the discharge pipe section 10, steam (pressurized gas) stored in the steam generation pipe section 8 and the steam storage section 9. The pressure of the liquefied gas 2 in the discharge pipe section 10 can be efficiently transferred from the supply valve 15 side to the supply destination cylinder through the transfer hose 16 and the charging nozzle 17 ( Supply).

  Further, the bent pipe portion 8A of the steam generating pipe 8 is formed by being bent in a substantially U shape in the upward and downward directions, and is arranged at a position sufficiently lower than the steam accommodating portion 9. The easily vaporized component in the gas 2 can be satisfactorily gas-liquid separated between the lower bent pipe portion 8A and the upper vapor accommodating portion 9, and the vapor of the liquefied gas 2 (vaporized gas) The steam can be efficiently collected in the steam container 9.

  In addition, in the present embodiment, a pressurized gas (for example, propane gas, nitrogen gas, helium gas, etc.) different from the liquefied gas 2 supplied from the storage tank 1 is used separately as in the prior art. This eliminates the need for a pressurized gas tank. Thereby, the installation of the whole liquefied gas supply apparatus which consists of the storage tank 1, the piping part 8 for vapor | steam generation of the injection piping 7, the piping part 10 for discharge | emission, etc. can be reduced in size.

  Further, since the liquefied gas 2 may be replenished into the steam generation pipe portion 8 of the injection pipe 7 so that the liquefied gas 2 is sequentially filled from the storage tank 1, replenishment for replenishing the pressurized gas as in the prior art. A tank or the like is not necessary, and this also makes it possible to reduce the size of the apparatus. Further, it is possible to eliminate the need for replenishment of pressurized gas at the time of maintenance, and the workability at the time of maintenance can also be improved.

  In addition, since the steam generation pipe portion 8 of the injection pipe 7 is not heated by the heat radiating portion (heating pipe 22) of the injection pipe 7, instead of the large storage tank 1, the large storage tank 1 has a heat insulating material or the like. It is not necessary to take special measures for heat insulation using the above, and this also simplifies and simplifies the facility, thereby reducing the production, management and maintenance costs of the facility.

  The steam generation pipe section 8 of the injection pipe 7 may be filled with a relatively small amount of the liquefied gas 2 of, for example, about 4 to 5 liters. The steam of the liquefied gas 2 generated in the steam generating pipe section 8 can be efficiently used as the pressurized gas, and energy saving can be achieved.

  Further, the heating pipe 22 on the steam generation pipe section 8 side is constituted by a heat radiation section (heat radiation heat exchanger) of the heat pump 20, and the cooling pipe 23 on the discharge pipe section 10 side is constituted by the heat absorption section (heat absorption heat). (Exchanger). For this reason, the heating on the steam generation piping unit 8 side and the cooling on the discharge piping unit 10 side can be efficiently performed by the heat pump 20 using a heat medium such as a refrigerant, for example. Can be realized.

  Therefore, according to the present embodiment, when the liquefied gas 2 is transferred to and discharged from a cylinder or the like to be supplied, it is not necessary to use a dedicated pump or a separate pressurized gas. The equipment of the entire apparatus can be simplified and downsized, and a so-called auto gas stand can be easily installed.

  In addition, when the liquefied gas 2 in the discharge pipe unit 10 is cooled using the cooling pipe 23 of the heat pump 20, the supply destination cylinder is at a relatively high temperature due to the influence of the ambient temperature, for example, in summer. However, when the low temperature liquefied gas is first transferred and filled into the cylinder, the temperature of the cylinder can be lowered, thereby lowering the pressure in the cylinder and bringing the liquefied gas 2 into the cylinder from the discharge pipe section 10. The supply (transfer filling) operation can be performed efficiently in a short time.

  Next, FIG. 6 shows a second embodiment of the present invention. The feature of the present embodiment is that the heat absorption portion of the heat pump is the first heat absorber provided in the discharge piping portion and the first heat absorber. In addition to the heat absorber, a second heat absorber provided at a position in contact with the outside air is configured, and the first and second heat absorbers are selectively switched and connected to the heat radiating portion of the heat pump. It is in the configuration.

  In the present embodiment, the same components as those in the first embodiment described above are denoted by the same reference numerals, and the description thereof is omitted.

  In the figure, 31 is a heat pump employed in the present embodiment, and this heat pump 31 is configured in substantially the same manner as the heat pump 20 described in the first embodiment, and a heating pipe 22, A compressor 24, an expansion valve 25, and the like are provided. However, the heat pump 31 in this case is different from the heat pump 20 according to the first embodiment in that it includes first and second heat absorbers 33 and 34 and a path switching valve 35 described later. .

  Reference numeral 32 denotes a circulation path of the heat pump 31, and the circulation path 32 circulates a heat medium such as a refrigerant in the same manner as the circulation path 21 described in the first embodiment. The circulation path 32 includes a first pipe section 32A connecting the compressor 24 and the heating pipe 22, and a second pipe section 32B connecting the heating pipe 22 and the expansion valve 25. The third conduit portion 32C and the like that connect between the expansion valve 25 and a later-described route switching valve 35 are configured.

  The circulation path 32 connects the first heat absorber 33 and a path switching valve 35, which will be described later, with a fourth pipe section 32D that connects between the first heat absorber 33 and the path switching valve 35, and between the first heat absorber 33 and the compressor 24. A connection point in the middle of the fifth pipeline portion 32E, a sixth pipeline portion 32F that connects between the later-described path switching valve 35 and the second heat absorber 34, and the fifth pipeline portion 32E. And a seventh pipe line portion 32G connecting the second heat absorber 34 via A.

  Reference numeral 33 denotes a first heat absorber as a cooling means provided in the dispensing pipe section 10, and the first heat absorber 33 is configured in the same manner as the cooling pipe 23 described in the first embodiment. . However, the first heat absorber 33 is different from the cooling pipe 23 in that it is connected in parallel with the second heat absorber 34 via a path switching valve 35 described later.

  34 is a second heat absorber provided at a position in contact with the outside air separately from the first heat absorber 33. The second heat absorber 34 is also a heat exchanger for heat absorption similar to the cooling pipe 23 described above. It is configured. However, the 2nd heat absorber 34 is always installed in the position which contacts external air like the outdoor unit in the case of using an air conditioner (household air conditioner) as a heating apparatus, for example.

  The second heat absorber 34 is vaporized (evaporated) using the expansion valve 25 when connected to the pipe portions 32C and 32F instead of the first heat absorber 33 by a path switching valve 35 described later. The heat medium in an easy state circulates in the second heat absorber 34, thereby promoting heat absorption by the evaporation effect of the heat medium. For this reason, the second heat absorber 34 cools the surrounding outside air by utilizing the heat absorption of the heat medium.

  Reference numeral 35 denotes a path switching valve that switches the flow path (path) of the heat medium between the first and second heat absorbers 33 and 34. The path switching valve 35 is configured to switch the path according to a switching signal from a control device (not shown). For example, the third conduit portion 32C of the circulation passage 32 is selectively communicated with either the fourth conduit portion 32D or the sixth conduit portion 32F.

  Thus, in the present embodiment configured as described above, it is possible to obtain substantially the same operational effects as those of the first embodiment, and heating on the steam generation pipe section 8 side and discharge pipe section 10 side. The heat pump 31 can efficiently perform the cooling in the above. In particular, in the present embodiment, since the path switching valve 35 and the like are additionally provided in the heat pump 31, the following operational effects are achieved.

  That is, the path switching valve 35 selects the first heat absorber 33 by being initially set in advance, for example, and the third pipe section 32C is connected to the fourth pipe section 32D by the path switching valve 35. . And the temperature of the liquefied gas 2 accommodated in the piping part 10 for discharge | emission is detected using the temperature sensor 19 in this state.

  Next, when the temperature detected by the temperature sensor 19 becomes equal to or lower than a reference temperature (for example, a temperature lower by 8 to 14 ° C. than the outside air temperature), the path switching valve 35 is replaced with the first heat absorber 33. The third conduit portion 32C is switched from the fourth conduit portion 32D to the sixth conduit portion 32F so as to select the second heat absorber 34.

  Thereby, since the cooling of the payout piping unit 10 by the heat pump 31 is interrupted, the liquefied gas 2 in the payout piping unit 10 is cooled to, for example, a temperature lower than 8 to 14 ° C. with respect to the outside temperature. And so-called overfilling can be prevented from occurring in the cylinder of the supply destination.

  In this case, when the liquefied gas 2 having an excessively low temperature is charged (supplied) from the inside of the discharge pipe portion 10 toward the supply destination cylinder, the supply destination cylinder is excessively filled with the liquefied gas 2 and overfilled. May occur. Therefore, by switching the path as described above by the path switching valve 35, problems associated with so-called overfilling can be eliminated, and the supply (transfer filling) operation of the liquefied gas 2 to the cylinder of the supply destination can be performed efficiently. Can be done.

  When the second heat absorber 34 is selected by the path switching valve 35, the third pipe section 32C is connected to the sixth pipe section 32F, so that the heat medium that has passed through the expansion valve 25 is While circulating through the second heat absorber 34 through the third pipe section 32C and the sixth pipe section 32F, through the seventh pipe section 32G, the connection point A, and the fifth pipe section 32E. Distribution to the compressor 24. Thereby, the surrounding heat | fever outside air can be cooled on the 2nd heat absorber 34 side using the heat absorption of a heat medium.

  In addition, when the amount of heat for generating steam on the side of the heat radiating section (heating tube 22) by the heat pump 31 is insufficient in winter or the like, the second heat absorber 34 can use outside air as a heat source. At this time, the heat medium (refrigerant) is evaporated using the outside air temperature on the second heat absorber 34 side, and the condensing action on the heat radiating part (heating pipe 22) side can be activated, so that the steam generating pipe part 8 The evaporation of the liquefied gas 2 can be promoted. Further, in the dispensing pipe portion 10, it is possible to prevent the liquefied gas 2 inside from being cooled more than necessary.

  In the first embodiment, as shown in FIG. 1, an example in which the injection pipe 7 is assembled in a pipe structure that surrounds the storage tank 1 in a substantially rectangular frame shape is taken as an example. Explained. However, the structure of the entire injection pipe is not limited to the configuration shown in FIG. 1. For example, the injection pipe may be configured as a pipe structure extending in a spiral around the storage tank.

  Moreover, in the said 1st Embodiment, the case where the steam generation piping part 8 was comprised by 8 A of bending pipe parts and the inclination pipe part 8B was mentioned as an example, and was demonstrated. However, the present invention is not limited to this. For example, the steam generating piping has a simple piping structure so as to connect between the filling valve 6 and the inclined pipe portion 8B using a piping member extending substantially horizontally. You may comprise a part.

  In the first embodiment, the case where the height difference between the storage tank 1 and the supply valve 15 is set to a dimension La of, for example, about 500 to 700 mm has been described as an example. However, the present invention is not limited to this, and the height difference between the two may be set to 700 mm or more. Moreover, the storage tank 1 is good also as a structure which installs a storage tank not only in the vertical installation illustrated in FIGS. 1-3 but in a horizontal installation state.

  Furthermore, in each said embodiment, the case where the liquefied gas 2 which consists of a mixture of liquefied butane and liquefied propane was used was mentioned as an example, and was demonstrated. However, the present invention is not limited to this, and can also be applied to the case where supply control of a liquefied gas such as butane, propane or dimethyl ether (DME) is performed.

It is a perspective view showing the whole liquefied gas supply device composition by a 1st embodiment of the present invention. It is the piping block diagram which looked at the injection | pouring piping etc. of the liquefied gas supply apparatus from the arrow II-II direction in FIG. FIG. 2 is an overall configuration diagram of a liquefied gas supply apparatus in which a steam generation piping section and a dispensing piping section in FIG. 1 are developed and shown. It is a control block diagram of the liquefied gas supply apparatus shown in FIG. It is a flowchart which shows the supply control processing procedure of the liquefied gas by the control apparatus in FIG. It is a whole block diagram in the same position as FIG. 3 which shows the liquefied gas supply apparatus by 2nd Embodiment.

Explanation of symbols

1 Storage tank 2 Liquefied gas 6 Filling valve (bottom valve)
7 Injection pipe 8 Steam generating pipe section 9 Steam accommodating section 10 Discharge piping section 11 Partition valve 12 Gas pressure equalizing line 13 Pressure equalizing valve 14 Liquid level sensor 15 Supply valve 16 Transfer filling hose 18 Pressure sensor 19 Temperature sensor 20, 31 Heat pump 21, 32 Circulation path 22 Heating tube (heating means, heat radiation part)
23 Cooling pipe (cooling means, heat absorption part)
24 Compressor 25 Expansion valve 26 Control device 33 First heat absorber (heat absorption part, cooling means)
34 Second heat absorber (heat absorption part)
35 Path switching valve

Claims (4)

A liquefied gas comprising a storage tank for storing liquefied gas, and a supply valve provided at a position lower than the storage tank and opened and closed when the liquefied gas in the storage tank is discharged to an external supply object In the supply device,
Provided on the bottom side of the storage tank is a bottom valve that is opened and closed when supplying the liquefied gas in the storage tank toward the supply valve side,
The bottom valve and the supply valve are connected to each other with a predetermined pipe length. Due to the difference in height between the storage tank and the supply valve, the liquefied gas in the storage tank is transferred to the bottom portion. An injection pipe to be injected in a filled state through a valve is provided,
In the middle of the injection pipe, a partition valve is provided for partitioning the injection pipe into a steam generation pipe section located on the upstream side and a discharge pipe section located on the downstream side,
The steam generation piping section partitioned by the partition valve has a heating means for heating the liquefied gas in the steam generation piping section with the partition valve closed to generate the liquefied gas steam. Provided,
The discharge pipe part is provided with cooling means for lowering the temperature of the liquefied gas in the discharge pipe part in a state where the gate valve is closed,
When the gate valve is opened, the liquefied gas in the discharge pipe is directed toward the supply valve by circulating the steam generated in the steam generation pipe as pressurized gas through the discharge pipe. A liquefied gas supply device characterized in that it is configured to extrude with gas pressure.   The steam generation pipe is provided with a steam storage section that protrudes upward at a position upstream of the partition valve and stores the liquefied gas vapor in a confined state. The liquefied gas supply device described.   Between the steam generating piping section and the discharging piping section, a heat pump is provided that circulates inside the heat medium that radiates heat by the condensation action at the position of the heat radiating section and absorbs heat by the evaporation action at the position of the heat absorbing section, The liquefied gas supply apparatus according to claim 1 or 2, wherein the heating means is constituted by a heat radiating portion of the heat pump, and the cooling means is constituted by a heat absorbing portion of the heat pump. The heat absorption part of the heat pump is provided in the discharge pipe part, the first heat absorption element constituting the cooling means, and the second heat absorption element provided at a position in contact with outside air separately from the first heat absorption element. The liquefied gas supply device according to claim 3, wherein the first and second heat absorbers are selectively switched and connected to a heat radiating portion of the heat pump.

Images