JP7302087B1 - Liquefied gas supply device - Google Patents

Abstract

A liquefied gas supply device capable of supplying an accurate amount of liquefied gas to a supply destination is provided. A liquefied gas supply device includes a housing capable of accommodating a liquefied gas container therein, a first end connectable to the liquefied gas container, and a second end opposite to the first end. a first pipe housed inside the housing, and a second end connected to the first pipe, having an inner diameter larger than the inner diameter of the first pipe, and having an inner diameter inside the housing A third pipe having an inner diameter smaller than the inner diameter of the second pipe, including a second pipe housed in the second pipe, a third end connected to the second pipe, and a fourth end exposed to the outside of the housing and a first valve unit that is installed in the first pipe and can realize a first switching that switches the first pipe between a closed state in which the first pipe is closed and an open state in which the first pipe is opened, and installed in the third pipe and a second valve unit capable of realizing a second switching between a closed state in which the third pipe is closed and an open state in which the third pipe is opened, and a measuring unit capable of measuring the mass of the second pipe. [Selection drawing] Fig. 1

Description

The present disclosure relates to liquefied gas supply devices.

2. Description of the Related Art A cylinder cabinet is known as a device for supplying a liquefied gas filled in a liquefied gas container to a supply destination (see Patent Document 1, for example). In the cylinder cabinet disclosed in Patent Document 1, the flow rate of gas flowing to the supply destination is measured by a flow meter installed near the gas supply port.

JP 2012-202422 A

Depending on the supply destination, it is desirable to supply an accurate amount of gas. For example, when the supply destination is a refrigerator and liquefied gas is supplied as a refrigerant, it is desired to supply an accurate amount of refrigerant to the refrigerator.

The present disclosure has been made in view of the above, and one object thereof is to provide a liquefied gas supply device capable of supplying an accurate amount of liquefied gas to a supply destination.

A liquefied gas supply apparatus according to the present disclosure includes a housing capable of accommodating a liquefied gas container therein, a first end connectable to the liquefied gas container, and a second end opposite to the first end. and a first pipe housed inside the housing, and a second end connected to the first pipe, having an inner diameter larger than the inner diameter of the first pipe, and inside the housing a third pipe having an inner diameter smaller than the inner diameter of the second pipe, including the accommodated second pipe, a third end connected to the second pipe, and a fourth end exposed to the outside of the housing; , which is installed in the first pipe and is installed in the first valve part capable of realizing the first switching between the closed state in which the first pipe is closed and the open state in which the first pipe is opened, and the third pipe , a second valve unit capable of realizing a second switching between a closed state in which the third pipe is closed and an open state in which the third pipe is opened, and a measuring unit capable of measuring the mass of the second pipe.

According to the present disclosure, an accurate amount of gas can be supplied to the destination.

Drawing 1 is a figure showing composition of a cylinder cabinet in an embodiment. FIG. 2 is a view of the inside of the housing with the cylinder cabinet installed as viewed from the left side of the housing. FIG. 3 is a view of the inside of the housing of FIG. 2 as viewed from above the housing. FIG. 4 is a schematic diagram showing a vertical cross section of the second pipe with the cylinder cabinet installed. FIG. 5 is a schematic diagram showing the bottom wall portion of the second pipe of FIG. 4 and its surroundings. FIG. 6 is a flowchart illustrating an example of a control procedure by a control unit; FIG. 7 is a flow chart showing an example of a zero-point calibration procedure. FIG. 8 is a flow chart showing an example of the gas measurement procedure. FIG. 9 is a flow chart showing an example of a gas supply procedure. FIG. 10 is a schematic diagram showing a vertical cross section of a second pipe in a modified example.

[Overview of embodiment]
A liquefied gas supply apparatus according to the present disclosure includes a housing capable of accommodating a liquefied gas container therein, a first end connectable to the liquefied gas container, and a second end opposite to the first end. and a first pipe housed inside the housing, and a second end connected to the first pipe, having an inner diameter larger than the inner diameter of the first pipe, and inside the housing a third pipe having an inner diameter smaller than the inner diameter of the second pipe, including the accommodated second pipe, a third end connected to the second pipe, and a fourth end exposed to the outside of the housing; , which is installed in the first pipe and is installed in the first valve part capable of realizing the first switching between the closed state in which the first pipe is closed and the open state in which the first pipe is opened, and the third pipe , a second valve unit capable of realizing a second switching between a closed state in which the third pipe is closed and an open state in which the third pipe is opened, and a measuring unit capable of measuring the mass of the second pipe.
By opening the first valve installed in the first pipe and closing the second valve installed in the third pipe, the liquefied gas flows into the second pipe through the first pipe. do. The mass of the liquefied gas that has flowed into the second pipe is determined based on the mass of the second pipe measured by the measuring unit. An accurate amount of liquefied gas to be supplied to the supply destination is measured based on the mass of the second pipe measured by the measurement unit. By opening the second valve portion, the measured liquefied gas flows from the second pipe to the supply destination through the third pipe. Thereby, an accurate amount of liquefied gas can be supplied to the supply destination.

The liquefied gas supply apparatus may further include a control section that controls the first switching and the second switching based on the mass of the second pipe measured by the measuring section.
The control unit controls the switching by the first valve unit and the switching by the second valve unit based on the mass of the second pipe measured by the measurement unit, thereby easily performing gas metering and gas supply. can.

In a state where the liquefied gas supply device is installed, the second pipe may be arranged below the liquefied gas container in the vertical direction.
By arranging the second pipe below the liquefied gas container in the vertical direction, the liquefied gas can easily flow into the second pipe from the liquefied gas container by gravity.

In the liquefied gas supply device, the second pipe includes a side wall portion having a cylindrical shape, an upper wall portion that closes an upper end portion of the side wall portion in the vertical direction when the liquefied gas supply device is installed, and a side wall portion. a bottom wall closing the lower vertical end of the . The second pipe may be formed with a first through hole and a second through hole penetrating through the second pipe such that a part of the bottom wall is missing. A second end may be connected to the first through hole, and a third end may be connected to the second through hole.

The liquefied gas flows into the second pipe from the bottom wall side without dripping due to the first through hole penetrating the second pipe so that a part of the bottom wall is missing. Thereby, vaporization of liquefied gas can be suppressed. The liquefied gas flows out from the bottom wall portion to the outside of the second pipe through the through hole penetrating the second pipe so that a part of the bottom wall portion is missing. This allows the liquefied gas to easily flow out from the second pipe.

In the liquefied gas supply device, the region including the second end of the first pipe and the region including the third end of the third pipe are configured by an integrated pipe serving as both the first pipe and the third pipe. good too. The first through-hole and the second through-hole may be configured by an integrated through-hole serving as both. The integrated pipe may include an integrated end serving as the second end and the third end. An integrated end may be connected to the integrated through hole.

The integrated pipe includes an integrated end so that the integrated pipe can be connected to the integrated through hole at the integrated end. This allows the liquefied gas to flow from the first pipe to the second pipe through the integrated pipe. Liquefied gas can flow from the second line to the third line through the integrated line.

Compared to the case where the first pipe and the third pipe are connected to the second pipe at different locations by connecting the integrated pipe serving as the first pipe and the third pipe to the second pipe in the integrated through hole This reduces the number of pipes. As a result, it is possible to reduce the space required for installing the pipe inside the housing.

When the second pipe receives force from the pipe connected to the second pipe, there is a possibility that the measured value of the measuring unit may be affected. Compared to the case where the first pipe and the third pipe are connected to the second pipe at different locations by connecting the integrated pipe serving as the first pipe and the third pipe to the second pipe in the integrated through hole As a result, the number of pipes connected to the second pipe is reduced. Thereby, it is possible to suppress the influence of the force that the second pipe receives from the pipe connected to the second pipe on the measured value of the measuring unit.

A change in the temperature inside the second pipe may move the interface between the gas phase and the liquid phase of the liquefied gas inside each of the first pipe and the third pipe connected to the second pipe. The liquefied gas unintentionally flows into the second pipe from the first pipe and the third pipe due to the movement of the interface between the gas phase and the liquid phase of the liquefied gas in each of the first pipe and the third pipe. , the calibration of the measurement unit may be affected. Compared to the case where the first pipe and the third pipe are connected to the second pipe at different locations by connecting the integrated pipe serving as the first pipe and the third pipe to the second pipe in the integrated through hole As a result, the number of pipes connected to the second pipe is reduced. As a result, it is possible to suppress the calibration of the measurement unit from being affected by the movement of the interface.

[Specific example of embodiment]
Next, an example of a specific embodiment of the liquefied gas supply device according to the present disclosure will be described with reference to the drawings. In the following drawings, the same or corresponding parts are given the same reference numerals, and the description thereof will not be repeated.

In the figure, the X direction indicates the width direction of the cylinder cabinet A when the cylinder cabinet A is installed. The Y direction indicates the depth direction of the cylinder cabinet A when the cylinder cabinet A is installed. The Z direction indicates the height direction (vertical direction) of the cylinder cabinet A when the cylinder cabinet A is installed.

[Cylinder cabinet]
FIG. 1 is a diagram showing the configuration of a cylinder cabinet A according to the embodiment. In FIG. 1, dashed lines conceptually indicate paths through which control signals controlled by the controller 9 are sent to the on-off valves AV1 to AV7. A dashed-dotted line conceptually shows a state in which the measurement units 8 are connected to the control unit 9 so as to be able to communicate with each other. In FIG. 1, the first tube T1 and the second tube T2 are indicated by thick lines.

First, with reference to FIG. 1, each component of a cylinder cabinet A (liquefied gas supply device), which is an embodiment of the present disclosure, will be described.

A cylinder cabinet A (liquefied gas supply device) accommodates a liquefied gas container B and supplies the liquefied gas filled in the liquefied gas container B to a supply destination (not shown). Examples of supply destinations include refrigerators. Part of the liquefied gas may be vaporized inside the liquefied gas container B. Examples of liquefied gases include propane gas (R290), carbon dioxide gas.

Referring to FIG. 1, the cylinder cabinet A includes a housing 10, a first pipe 1, a second pipe 2, a third pipe 3, a fourth pipe 4, a fifth pipe 5, a first valve A portion V1, a second valve portion V2, a measurement portion 8, and a control portion 9 are provided.

<Case>
FIG. 2 is a view of the inside of the housing 10 with the cylinder cabinet A installed as viewed from the left side of the housing 10. As shown in FIG. In the width direction, the left side is the side on which the later-described door portion 14 is arranged. FIG. 3 is a view of the inside of the housing 10 of FIG. 2 as viewed from above the housing 10. As shown in FIG. In the vertical direction, the side on which an exhaust damper 12, which will be described later, is arranged is the upper side. 2 and 3, illustration of the control unit 9 is omitted.

The housing 10 can accommodate the liquefied gas container B inside. The housing 10 has, for example, a rectangular parallelepiped shape. Referring to FIG. 2, housing 10 includes exhaust damper 12, gas detector 13, door portion 14, control box 15, pedestal portion 16, and holding chains 16a and 16b.

Referring to FIG. 1, exhaust damper 12 and gas detector 13 are installed outside housing 10 . A fan (not shown) installed inside the exhaust damper 12 is operated to discharge gas inside the housing 10 from the exhaust damper 12 , so that the inside of the housing 10 is kept at a negative pressure. The gas detector 13 is a suction type gas detector. The gas detector 13 monitors gas leakage inside the housing 10 . A negative pressure gauge NP for measuring the pressure inside the housing 10 is installed inside the housing 10 .

Referring to FIG. 3, door portion 14 is installed on the left side of housing 10 . A rear end portion 14 a of the door portion 14 is rotatably held by a rear wall portion 10 a of the housing 10 . The door portion 14 opens and closes in the opening/closing direction D with the rear end portion 14a as a base end. When the front end portion 14b of the door portion 14 is separated from the front wall portion 10b of the housing 10, the door portion 14 is opened. By opening the door portion 14 , the liquefied gas container B can be taken in and out of the inside of the housing 10 . The door portion 14 is closed by fixing the front end portion 14b of the door portion 14 to the front wall portion 10b of the housing 10 . The inside of the housing 10 is closed by closing the door portion 14 .

2 and 3, the control box 15 is installed outside the front wall portion 10b of the housing 10. As shown in FIG. The control box 15 houses the control section 9 . The pedestal portion 16 is connected to the inside of the rear wall portion 10 a of the housing 10 . The liquefied gas container B is arranged on the top surface 160 of the pedestal portion 16 .

Referring to FIG. 2, holding chains 16a and 16b hold liquefied gas containers B. As shown in FIG. The holding chain 16b is positioned below the holding chain 16a. Both ends of the holding chain 16 a are connected to brackets 17 a arranged inside the rear wall portion 10 a of the housing 10 . Both ends of the holding chain 16 b are connected to brackets 17 b arranged inside the rear wall portion 10 a of the housing 10 .

<First pipe>
Referring to FIG. 1, the first pipe 1 has a first end E1 connectable to the liquefied gas container B and a second end E2 which is the end opposite to the first end E1. include. The first pipe 1 is housed inside the housing 10 .

The first pipe 1 is composed of a flexible hose FP, a first metal pipe P1, a first tube T1 and a second metal pipe P2 connected in order from a first end E1 to a second end E2. The first tube T1 is made of polytetrafluoroethylene (PTFE), for example.
An inlet valve Va is installed at a portion where the flexible hose FP and the first metal pipe P1 are connected. The first metal pipe P1, the first tube T1 and the second metal pipe P2 are connected to each other by joints (not shown).

A check valve CV1 is installed in the flexible hose FP. A filter FL, an on-off valve AV1, and a first valve portion V1 are installed in order from the flexible hose FP toward the second metal pipe P2 in the first metal pipe P1. The first pipe 1 includes a main pipe MP1 and a bypass pipe BP1 formed in the first metal pipe P1. The bypass pipe BP1 includes a region between a portion where the on-off valve AV1 is installed and a portion where the first valve portion V1 is installed in the first metal pipe P1, and a portion where the first valve portion V1 is installed in the first metal pipe P1. and a region between the portion connected to the first tube T1 and the portion connected to the first tube T1.

The on-off valve AV1 is composed of, for example, an air operated valve. The dashed lines in FIG. 1 conceptually indicate, for example, piping for sending pneumatic signals, which are control signals sent to air-operated valves under the control of the controller 9 . The same applies to on-off valves AV2 to AV7, which will be described later.

<Second pipe>
FIG. 4 is a schematic diagram showing a vertical cross section of the second pipe 2 with the cylinder cabinet A installed. FIG. 5 is a schematic diagram showing the bottom wall portion 22 of the second pipe 2 of FIG. 4 and its surroundings.

With reference to FIG. 1 , the second pipe 2 is connected to the first pipe 1 at the second end E2 and housed inside the housing 10 . With reference to FIG. 2, the second pipe 2 is arranged below the liquefied gas container B in the vertical direction when the cylinder cabinet A is installed. The second pipe 2 is, for example, made of stainless steel such as SUS304 conforming to JIS (Japanese Industrial Standards).

The second pipe 2 has an inner diameter that is larger than the inner diameter of the first pipe 1 . The inner diameter of the second pipe 2 is, for example, 60 mm or more and 200 mm or less.

Referring to FIG. 4, the second pipe 2 includes a side wall portion 20 having a cylindrical shape, an upper wall portion 21 closing the upper end portion of the side wall portion 20 in the vertical direction, and a lower end portion of the side wall portion 20 in the vertical direction. a bottom wall 22 closing the . The second pipe 2 is arranged, for example, so as to extend along the vertical direction. The central axis of the second pipe 2 extends, for example, in the vertical direction.

A through hole 200 penetrating through the side wall portion 20 is formed above the center of the side wall portion 20 in the vertical direction. A fifth pipe 5 is connected to the through hole 200 .

The second pipe 2 is formed with a first through hole H1 and a second through hole H2 penetrating the second pipe 2 so that a part of the bottom wall portion 22 is missing. A second end E2 of the first pipe 1 is connected to the first through hole H1. A later-described third end E3 of the third pipe 3 is connected to the second through hole H2.

The 1st through-hole H1 and the 2nd through-hole H2 are comprised by the integrated through-hole H which serves as both. The integrated through-hole H is connected to an integrated end E of an integrated pipe C, which will be described later.

Referring to FIG. 5, the integrated through-hole H penetrates from the outer peripheral side surface 22a of the bottom wall portion 22 to the top surface 22b. An integrated through-hole H is formed by a through-hole 20a formed in the side wall portion 20 and having a circular cross section with a partially cutout shape, and an arc-shaped concave portion 22c formed in the bottom wall portion 22 and opening upward. be. An integrated pipe C is inserted into the integrated through-hole H.

<Third pipe>
Referring to FIG. 1 , the third pipe 3 includes a third end E3 connected to the second pipe 2 and a fourth end E4 exposed outside the housing 10 . A coupler C1 connectable to a supply destination, a pipe (not shown) connected to the supply destination, and a vacuum pump (not shown) is installed at the fourth end E4. The third pipe 3 has an inner diameter smaller than the inner diameter of the second pipe 2 .

The third pipe 3 is composed of a second metal pipe P2, a first tube T1 and a third metal pipe P3 which are connected in order from the third end E3 to the fourth end E4. The second metal pipe P2, the first tube T1 and the third metal pipe P3 are connected to each other by joints (not shown).

A second valve portion V2 and a check valve CV2 are installed in the third metal pipe P3 in order from the first tube T1 toward the fourth end E4. The third pipe 3 includes a main pipe MP2 and a bypass pipe BP2 formed in a third metal pipe P3. The bypass pipe BP2 includes a region of the third metal pipe P3 between a portion connected to the first tube T1 and a portion where the second valve portion V2 is installed, and a region of the third metal pipe P3 where the second valve portion V2 is located. the area between the part where it is installed and the part where the check valve CV2 is installed.

The area including the second end E2 of the first pipe 1 and the area including the third end E3 of the third pipe 3 are configured by the integrated pipe C serving as the first pipe 1 and the third pipe 3. . The integrated pipe C is composed of a first tube T1 and a second metal pipe P2 that are connected to each other. The integrated pipe C includes an integrated end E that serves as both a second end E2 and a third end E3.

<Fourth pipe>
Referring to FIG. 1 , the fourth pipe 4 includes a fifth end E5 connected to the integrated pipe C and a sixth end E6 exposed outside the housing 10 . A sixth end E6 is provided with a coupler C2 connectable to a discharge tube (not shown) for discharging the gas to the atmosphere. The fourth pipe 4 is made of metal. The fourth pipe 4 is provided with an on-off valve AV7 and a check valve CV3 in order from the fifth end E5 toward the sixth end E6.

<Fifth pipe>
Referring to FIG. 1, the fifth pipe 5 extends between the seventh end E7 connected to the through hole 200 formed in the second pipe 2, the on-off valve AV7 and the check valve CV3. and an eighth end E8 connected to the . The fifth pipe 5 is composed of a fourth metal pipe P4, a second tube T2 and a fifth metal pipe P5 which are connected in order from the seventh end E7 to the eighth end E8. The second tube T2 is made of polytetrafluoroethylene (PTFE), for example. A small flow rate control valve FV1 and an on-off valve AV2 are installed in the fifth metal pipe P5 in order from the second tube T2 toward the eighth end E8.

<First valve part>
Referring to FIG. 1, the first valve unit V1 is installed in the first pipe 1, and can realize the first switching between the closed state in which the first pipe 1 is closed and the open state in which the first pipe 1 is opened. is. The first valve portion V1 includes an on-off valve AV3, a minute flow rate control valve FV2, and an on-off valve AV4.

The on-off valve AV3 and the minute flow control valve FV2 are installed in the main pipe MP1. The on-off valve AV4 is installed in the bypass pipe BP1. The first pipe 1 is closed by closing the on-off valve AV3 and the on-off valve AV4. The first pipe 1 is opened by opening the on-off valve AV3 or the on-off valve AV4.

<Second valve>
Referring to FIG. 1, the second valve unit V2 is installed in the third pipe 3, and can realize the second switching between the closed state in which the third pipe 3 is closed and the open state in which the third pipe 3 is opened. is. The second valve portion V2 includes an on-off valve AV5, a minute flow rate control valve FV3, an on-off valve AV6, and a minute flow rate control valve FV4.

The on-off valve AV5 and the minute flow control valve FV3 are installed in the main pipe MP2. The on-off valve AV6 and the minute flow rate control valve FV4 are installed in the bypass pipe BP2. The third pipe 3 is closed by closing the on-off valve AV5 and the on-off valve AV6. The third pipe 3 is opened by opening the on-off valve AV5 or the on-off valve AV6.

<Measurement section>
The measuring unit 8 can measure the mass of the second pipe 2 . The measuring unit 8 is composed of, for example, an explosion-proof platform scale.

<Control unit>
The control unit 9 controls opening and closing of the on-off valves AV1 to AV7 installed in the cylinder cabinet A. As shown in FIG. The control unit 9 controls the first switching by controlling the on-off valve AV3 and the on-off valve AV4 of the first valve unit V1. The control unit 9 controls the second switching by controlling the on-off valve AV5 and the on-off valve AV6 of the second valve unit V2.

The control unit 9 is configured by, for example, a PLC (Programmable Logic Controller) including a CPU (Central Processing Unit). The control unit 9 controls opening and closing of the on-off valves AV1 to AV7 by executing a control program such as a ladder program. An input/output unit (not shown) of the control unit 9 includes on-off valves AV1 to AV7, a measurement unit 8, a display unit (not shown) including a liquid crystal panel and the like, a touch panel and the like, and is used for input operation from the user. is connected to an operation reception unit (not shown) that receives the

In addition to the components described above, referring to FIG. 1, cylinder cabinet A includes discharge pipes 6a, 6b, 6c, 6d. The discharge pipes 6a, 6b, 6c are for discharging the liquefied gas to the outside of the housing 10 in an emergency.

The discharge pipe 6a connects the first pipe 1 and the coupler C2. A pressure gauge PG and a safety valve SV1 are installed in the discharge pipe 6a. The discharge pipe 6b connects the fifth pipe 5 and the coupler C2. A safety valve SV2 is installed in the discharge pipe 6b. The discharge pipe 6c connects the third pipe 3 and the coupler C2. A safety valve SV3 is installed in the discharge pipe 6c. The discharge pipe 6d connects a region of the third pipe 3 closer to the coupler C2 than the safety valve SV3 and the discharge pipe 6c. An outlet valve Vb is installed on the discharge pipe 6d.

[Procedure of control by the control part]
FIG. 6 is a flow chart showing an example of a control procedure by the control unit 9. As shown in FIG.

Next, an outline of control by the control unit 9 in this embodiment will be described with reference to FIG. Operations performed by workers such as removing the supply destination, piping connected to the supply destination, and the vacuum pump from the coupler C1, and other control such as control for starting or stopping the operation of the vacuum pump are described below. and illustration are omitted. In the initial state of control by the control unit 9, the on-off valve AV1 is open and the on-off valves AV2 to AV7 are closed.

Referring to FIG. 6, at step ST1, the control unit 9 executes a “zero point calibration” process for calibrating the zero point of the measuring unit 8. As shown in FIG.

In step ST2, the control unit 9 uses the measuring unit 8 whose zero point has been calibrated in step ST1 to perform a "gas measurement" process of measuring the amount of liquefied gas to be supplied to the supply destination.

In step ST3, the control unit 9 executes the "gas supply" process of supplying the liquefied gas measured in step ST2 to the supply destination. Thus, the control unit 9 ends a series of processing.

FIG. 7 is a flow chart showing an example of a zero-point calibration procedure. FIG. 8 is a flow chart showing an example of the gas measurement procedure. FIG. 9 is a flow chart showing an example of a gas supply procedure.

Next, detailed procedures of each process in steps ST1 to ST3 will be described with reference to the flow charts of FIGS. 7 to 9. FIG.

<Zero point calibration>
1 and 7, the controller 9 liquefies a predetermined initial inflow amount (for example, 10% or more and 30% or less of the volume of the second pipe 2) from the liquefied gas container B into the second pipe 2. Perform "initial flow" to flow gas. After that, the controller 9 calibrates the zero point of the measuring unit 8 by setting the mass of the second pipe 2 after the initial inflow as the zero point. Specifically, it will be described below with reference to FIG. In the initial state of zero point calibration, the vacuum pump is connected to coupler C1.

In step ST<b>10 , the control unit 9 vacuums to reduce the pressure in the second pipe 2 . The control unit 9 opens the on-off valve AV5 and the on-off valve AV6 of the second valve unit V2 for a predetermined period of time (for example, 10 seconds) to release the liquefied gas remaining in the second pipe 2 into the third It discharges from coupler C1 via line 3 to the vacuum pump. The pressure inside the second pipe 2 is reduced to less than 10 Pa, for example. After this, the vacuum pump is removed from the coupler C1.

In step ST11, the control section 9 sets the measurement value of the measuring section 8 as the zero point.

In step ST12, the control unit 9 opens the first pipe 1 by opening the on-off valve AV4 of the first valve unit V1. The controller 9 causes the liquefied gas to initially flow into the second pipe 2 by opening the first pipe 1 . Here, the control section 9 monitors the mass of the second pipe 2 measured by the measuring section 8 . When the mass of the second pipe 2 reaches the predetermined first target value, the controller 9 executes step ST13. The first target value is set lower than the mass corresponding to the initial inflow (the mass of the second pipe 2 into which the initial inflow of liquefied gas has flowed).

In step ST13, the control unit 9 closes the on-off valve AV4 of the first valve unit V1 and then opens the on-off valve AV3 to liquefy a small amount of liquid from the liquefied gas container B into the second pipe 2 through the small flow rate control valve FV2. Make minor adjustments to allow more gas to enter. Here, the control section 9 monitors the mass of the second pipe 2 measured by the measuring section 8 . When the mass of the second pipe 2 reaches the predetermined second target value, the controller 9 closes the on-off valve AV3 to close the first pipe 1, and then executes step ST14. The second target value is set higher than the first target value and lower than the mass corresponding to the initial inflow amount.

In step ST14, the control unit 9 determines whether or not the mass of the second pipe 2 containing the liquefied gas that has flowed into the second pipe 2 is equal to or less than a predetermined initial allowable value. The initial allowable value is set higher than the mass corresponding to the initial inflow.

When the control unit 9 determines that the mass of the second pipe 2 is equal to or less than the initial allowable value, it executes step ST16. When determining that the mass of the second pipe 2 exceeds the initial allowable value, the control unit 9 executes step ST15.

In step ST15, the control unit 9 causes the excess liquefied gas that has flowed into the second pipe 2 to flow outside the cylinder cabinet A through the fifth pipe 5 and the fourth pipe 4 by opening the on-off valve AV2. discharge. Here, the control section 9 monitors the mass of the second pipe 2 measured by the measuring section 8 . When the mass of the second pipe 2 reaches the initial permissible value, the controller 9 closes the on-off valve AV2 and then executes step ST16.

In step ST16, the control section 9 resets the measured value of the measuring section 8 to zero. Thus, the control unit 9 terminates the "zero point calibration" process.

<Gas measurement>
Based on the mass of the second pipe 2 measured by the measuring unit 8, the control unit 9 controls switching by the first valve unit V1, thereby causing the liquefied gas to flow into the second pipe 2, while supplying the gas to the supply destination. Weigh the amount of liquefied gas supplied to the Specifically, it will be described below with reference to FIG.

In step ST20, the control unit 9 opens the first pipe 1 by opening the on-off valve AV4 of the first valve unit V1. The controller 9 starts the liquefied gas to flow into the second pipe 2 by opening the first pipe 1 . Here, the control section 9 monitors the mass of the second pipe 2 measured by the measuring section 8 . When the mass of the second pipe 2 reaches the predetermined third target value, the controller 9 executes step ST21. The third target value is set lower than the mass corresponding to the supply amount (the mass of the second pipe 2 into which the supply amount of liquefied gas has flowed).

In step ST21, the control unit 9 closes the on-off valve AV4 of the first valve unit V1 and then opens the on-off valve AV3 to liquefy a small amount of liquid from the liquefied gas container B into the second pipe 2 through the small flow rate control valve FV2. Allow more gas to flow in. Here, the control section 9 monitors the mass of the second pipe 2 measured by the measuring section 8 . When the mass of the second pipe 2 reaches the predetermined fourth target value, the controller 9 closes the on-off valve AV3 to close the first pipe 1, and then executes step ST22. The fourth target value is set higher than the third target value and lower than the mass corresponding to the supply amount.

In step ST22, the control unit 9 determines whether or not the mass of the second pipe 2 containing the liquefied gas that has flowed into the second pipe 2 is equal to or less than a predetermined allowable value. The permissible value is set higher than the mass corresponding to the supply amount.

When the control unit 9 determines that the mass of the second pipe 2 is equal to or less than the allowable value, the control unit 9 ends the “gas measurement” process. When determining that the mass of the second pipe 2 exceeds the allowable value, the controller 9 executes step ST23.

In step ST23, the control unit 9 causes the excess liquefied gas that has flowed into the second pipe 2 to flow outside the cylinder cabinet A through the fifth pipe 5 and the fourth pipe 4 by opening the on-off valve AV2. discharge. Here, the control section 9 monitors the mass of the second pipe 2 measured by the measuring section 8 . When the mass of the second pipe 2 reaches the allowable value, the control unit 9 closes the on-off valve AV2 and then terminates the "gas measurement" process.

<Gas supply>
The control unit 9 supplies the liquefied gas measured in step ST2 from the second pipe 2 by controlling switching by the second valve unit V2 based on the mass of the second pipe 2 measured by the measuring unit 8. supply first. Specifically, it will be described below with reference to FIG.

In step ST30, the control unit 9 opens the third pipe 3 by opening the on-off valve AV6 of the second valve unit V2. The control unit 9 starts supplying the liquefied gas from the second pipe 2 by opening the third pipe 3 . Here, the control section 9 monitors the mass of the second pipe 2 measured by the measuring section 8 . When the mass of the second pipe 2 reaches the predetermined fifth target value, the controller 9 executes step ST31. The fifth target value is set lower than the mass corresponding to the supply amount.

In step ST31, the control unit 9 closes the on-off valve AV6 of the second valve unit V2 and then opens the on-off valve AV5, thereby further supplying a small amount of liquefied gas from the second pipe 2 through the minute flow rate control valve FV3. . Here, the control section 9 monitors the mass of the second pipe 2 measured by the measuring section 8 . When the mass of the second pipe 2 reaches the predetermined sixth target value, the controller 9 closes the on-off valve AV5 to close the third pipe 3, and then executes step ST32. The sixth target value is set lower than the fifth target value.

In step ST32, the control unit 9 determines whether the mass of the second pipe 2 containing the liquefied gas remaining in the second pipe 2 is within a predetermined allowable range. The median value of the allowable range is set lower than the sixth target value.

When the control unit 9 determines that the mass of the second pipe 2 is within the allowable range, it ends the “gas supply” process. When the control unit 9 determines that the mass of the second pipe 2 is out of the allowable range, it executes step ST33.

In step ST33, the control section 9 executes error processing. In the error processing, the control unit 9 notifies the user of the occurrence of the error by sound, for example.

In the processing by the control unit 9 described above, the next procedure may be executed after the control unit 9 waits for an input from the user.

After step ST3 described above, the control unit 9 may allow the user to select whether or not to change the amount of gas supplied to the supply destination. In this case, if the user selects not to change the supply amount, the control section 9 may return to step ST2 and repeat the subsequent processes.

Note that the cylinder cabinet A does not have to include the control unit 9 . In this case, the above-described series of processing by the control unit 9 may be realized by the work performed by the user from outside the cylinder cabinet A. For example, from step ST20 to step ST21, when the user opens the on-off valve AV4 and visually confirms the measured value of the measuring unit 8, and the mass of the second pipe 2 reaches a predetermined third target value. The on-off valve AV4 may be closed immediately.

It should be noted that the rigidity of the first tube T1 and the second tube T2 should not affect the measured value of the measuring section 8. The rigidity of the first tube T<b>1 and the second tube T<b>2 should be such that the mass of the second pipe 2 can be accurately measured by the measurement unit 8 .

[Modification]
FIG. 10 is a schematic diagram showing a vertical cross section of the second pipe 2 in the modified example. In FIG. 10, illustration of the first tube T1 and the third metal tube P3 is omitted.

Referring to FIG. 10, in second pipe 2, first through hole H1 and second through hole H2 may be formed at different locations. In this case, the third pipe 3 may be composed of a sixth metal pipe P6, a first tube T1 and a third metal pipe P3 which are connected in order from the third end E3 to the fourth end E4. A sixth metal pipe P6 of the third pipe 3 may be inserted into the second through hole H2.

It should be understood that the embodiments and examples disclosed this time are illustrative in all respects and not restrictive in any aspect. The scope of the present invention is defined by the scope of the claims rather than the above description, and is intended to include all modifications within the meaning and range of equivalents of the scope of the claims.

1 first pipe, 2 second pipe, 3 third pipe, 4 fourth pipe, 5 fifth pipe, 6a, 6b, 6c, 6d discharge pipe, 8 measurement unit, 9 control unit, 10 housing, 12 exhaust damper , 13 gas detector, 14 door portion, 15 control box, 16 pedestal portion, 16a holding chain, 20 side wall portion, 20a through hole, 21 upper wall portion, 22 bottom wall portion, 22a outer peripheral side surface, 22b top surface, 22c concave portion , 200 through hole, A cylinder cabinet, AV1, AV2, AV3, AV4, AV5, AV6, AV7 on-off valve, B liquefied gas container, MP1, MP2 main pipe, BP1, BP2 bypass pipe, C integrated pipe, C1, C2 coupler, CV1, CV2, CV3 check valve, E unified end, E1 first end, E2 second end, E3 third end, E4 fourth end, E5 fifth end, E6 sixth end, E7 7th end, E8 8th end, FL filter, FP Flexible hose, FV1, FV2, FV3, FV4 Minute flow rate control valve, H Integrated through hole, H1 First through hole, H2 Second through hole, NP Negative Pressure gauge, P1 First metal pipe, P2 Second metal pipe, P3 Third metal pipe, P4 Fourth metal pipe, P5 Fifth metal pipe, P6 Sixth metal pipe, PG Pressure gauge, SV1, SV2, SV3 Safety valve, T1 1st tube, T2 2nd tube, Va inlet valve, Vb outlet valve, V1 1st valve part, V2 2nd valve part

Claims (5)

a housing capable of accommodating a liquefied gas container inside;
a first pipe housed inside the casing, including a first end connectable to the liquefied gas container and a second end opposite to the first end;
a second pipe that is connected to the first pipe at the second end, has an inner diameter that is larger than the inner diameter of the first pipe, and is housed inside the housing;
including a third end that is connected to the second pipe and housed inside the housing and a fourth end that is exposed to the outside of the housing, and has an inner diameter smaller than the inner diameter of the second pipe; a third pipe having
a first valve unit installed in the first pipe and capable of realizing a first switching between a closed state in which the first pipe is closed and an open state in which the first pipe is opened;
A second valve unit installed in the third pipe and capable of realizing a second switching between a closed state in which the third pipe is closed and an open state in which the third pipe is opened;
A measuring unit capable of measuring the mass of the second pipe ,
A liquefied gas supply device , wherein a pump is not installed in the first pipe . The liquefied gas supply device according to claim 1, further comprising a control section that controls said first switching and said second switching based on the mass of said second pipe measured by said measuring section. 2. The liquefied gas supply device according to claim 1, wherein said second pipe is disposed below said liquefied gas container in the vertical direction when said liquefied gas supply device is installed. a housing capable of accommodating a liquefied gas container inside;
a first pipe housed inside the casing, including a first end connectable to the liquefied gas container and a second end opposite to the first end;
a second pipe that is connected to the first pipe at the second end, has an inner diameter that is larger than the inner diameter of the first pipe, and is housed inside the housing;
a third pipe having an inner diameter smaller than the inner diameter of the second pipe, including a third end connected to the second pipe and a fourth end exposed to the outside of the housing;
a first valve unit installed in the first pipe and capable of realizing a first switching between a closed state in which the first pipe is closed and an open state in which the first pipe is opened;
A second valve unit installed in the third pipe and capable of realizing a second switching between a closed state in which the third pipe is closed and an open state in which the third pipe is opened;
A liquefied gas supply device comprising a measuring unit capable of measuring the mass of the second pipe,
The second pipe is
a side wall portion having a cylindrical shape;
In a state where the liquefied gas supply device is installed, an upper wall portion that closes the upper end portion of the side wall portion in the vertical direction, and a bottom wall portion that closes the lower end portion of the side wall portion in the vertical direction,
The second pipe is formed with a first through hole and a second through hole penetrating the second pipe so that a part of the bottom wall portion is missing,
The second end is connected to the first through hole,
The liquefied gas supply device, wherein the third end is connected to the second through hole. The region including the second end of the first pipe and the region including the third end of the third pipe are composed of an integrated pipe serving as the first pipe and the third pipe,
The first through-hole and the second through-hole are configured as an integrated through-hole serving as both,
The integrated pipe includes an integrated end that serves as the second end and the third end,
The liquefied gas supply device according to claim 4, wherein the integrated end portion is connected to the integrated through hole.

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