JP2000320798A - Bulk rolly - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bulk rolly capable of supplying liquefied gas (liquid) into a bulk storage tank and recovering liquefied gas (liquid and gas) in the bulk storage tank securely. SOLUTION: In a bulk rolly supplying liquefied gas into a bulk storage tank 30 which is installed on the ground side and stores liquefied gas such as LP gas, a compressor 15 obtaining power from PTO of a transmission to drive is provided, and either of a suction port and a discharge port of the compressor 15 is connected with a liquefied gas tank 1 and the other thereof is connected with the bulk storage tank 30. A change-over valve switching the connection to the suction port of the compressor 15 to a passage from the bulk storage tank 30 or a passage from the liquefied gas tank 1 is provided, liquefied gas (liquid) is filled into the bulk storage tank 30 by absorbing liquefied gas (liquid) from the bulk storage tank 30 and forcedly feeding it into the liquefied gas tank 1 of the bulk rolly, and liquefied gas (liquid) is recovered into the liquefied gas tank 1 by absorbing liquefied gas (gas) from the liquefied gas tank 1 and forcedly feeding it into the bulk storage tank 30. Furthermore, liquefied gas (gas) remaining in the bulk storage tank 30 is recovered into the liquefied gas tank 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bulk lorry capable of supplying a liquefied gas to a bulk storage tank or the like installed on the ground side for storing a liquefied gas such as LP gas and recovering the liquefied gas from the bulk storage tank or the like.

[0002]

2. Description of the Related Art In recent years, a supply form of a liquefied gas supplied from a gas cylinder has become widespread in ordinary households in which a large bulk storage tank is provided at a supply place and is directly filled with a tank lorry.

Conventionally, the supply of liquefied gas (liquid) from a liquefied gas tank of a bulk lorry to a bulk storage tank is generally performed by power taken off from a PTO (power take-off: a device for taking out the rotational power of the engine from a transmission portion for work) of an engine. This is by driving the liquid feed pump.

Japanese Unexamined Patent Publication No. Hei 3-15000 shows this typical prior art. As shown in FIG. 8, a gearbox 4 is provided on a PTO 3 of a transmission 2, and a hydraulic pressure is applied via a propulsion shaft 5. The pump 25 is driven, and pressurized oil is sent to a hydraulic motor 26 via an electromagnetic switching valve 27 that can be switched by wireless operation, and the liquefied gas (liquid) is supplied to the bulk storage tank 30 by the hydraulic motor 26.
The liquid feed pump 20 for supplying the liquid is driven. The electromagnetic switching valve 27 is in a state shown in FIG. 8 when the liquefied gas is not supplied, and is configured to return the pressure oil from the hydraulic pump 25 to the oil tank 29.

[0005]

The conventional bulk trolley supply device is equipped with various safety devices so that the bulk storage tank can be filled even at the eaves of a general household, and the filling operation can be performed only by the liquid feed pump. ing. Bulk storage tanks cannot be moved by transportation like gas cylinders, so as bulk storage tanks spread to ordinary households, if a large number of such tanks are installed, it can be used in the event of an emergency such as an earthquake or an emergency in bulk storage tanks. It is possible that a liquefied gas remaining in the bulk storage tank is collected.

However, in the conventional bulk lorry,
It is conceivable to provide a mechanism for recovering the liquefied gas from the bulk storage tank without using a mechanism for recovering the liquefied gas. It is not possible to collect all the liquefied gas (liquid) inside. Therefore, a dedicated vehicle for collecting liquefied gas is considered necessary, but having a dedicated vehicle for collecting liquefied gas in a bulk storage tank not only requires a parking area for the dedicated vehicle but also However, there is a drawback that maintenance and inspection must be always prepared in preparation for an emergency dispatch, which increases maintenance costs.

SUMMARY OF THE INVENTION In view of the above, it is an object of the present invention to provide a bulk lorry capable of supplying a liquefied gas (liquid) to a bulk storage tank and reliably recovering the liquefied gas (liquid and gas) from the bulk storage tank. Is what you do.

[0008]

In order to achieve the above object, the present invention employs the following means. That is, in a bulk lorry that supplies liquefied gas to a bulk storage tank or the like that stores liquefied gas such as LP gas installed on the ground side, a compressor that is driven by power from the PTO of the transmission is provided, and a suction port of the compressor is provided. One of the discharge ports is connected to the liquefied gas tank and the other is connected to the bulk storage tank, and a switching valve is provided to switch the connection to the suction port of the compressor between the flow path from the bulk storage tank and the flow path from the liquefied gas tank The liquefied gas (gas) is sucked from the bulk storage tank, and the liquefied gas (liquid) is pumped into the liquefied gas tank of the bulk lorry to fill the liquefied gas (liquid) into the bulk storage tank. To collect the liquefied gas (liquid) into the liquefied gas tank, and further collect the liquefied gas (gas) remaining in the bulk storage tank into the liquefied gas tank. It is characterized in.

In the bulk lorry of the present invention, the suction port of the compressor communicates with the bulk storage tank and the discharge port communicates with the liquefied gas tank, and the liquefied gas (gas) in the bulk storage tank is pumped to the liquefied gas tank to reduce the internal pressure of the liquefied gas tank. The liquefied gas (liquid) is filled into the bulk storage tank by increasing the temperature. Then, when recovering the liquefied gas (liquid) in the bulk storage tank, the flow path to the suction port and the discharge port of the compressor is switched. That is, the suction port of the compressor communicates with the liquefied gas tank, and the discharge port communicates with the bulk storage tank. As a result, the liquefied gas (gas) in the liquefied gas tank is pumped to the bulk storage tank, and the liquefied gas (liquid) is collected in the liquefied gas tank by increasing the internal pressure of the bulk storage tank. Furthermore, the liquefied gas (liquid and gas) in the bulk storage tank is completely recovered by returning the flow path to the suction port and the discharge port of the compressor to the original state and collecting the liquefied gas (gas) in the bulk storage tank to the liquefied gas tank. Can be recovered.

[0010] The switching valve for switching the flow path to the suction port and the discharge port of the compressor can be configured by combining an electromagnetic valve. In addition, if a liquefied gas tank, a bulk storage tank, and a four-way valve that connects a suction port and a discharge port of a compressor are used, piping connection can be simplified. However, in the case of one four-way valve, the compressor must be operated even when the liquefied gas (liquid) is received in the liquefied gas tank at the base, for example, since the compressor must pass through the compressor. Therefore, as described in claim 2, the switching valve is configured by combining two electromagnetic four-way valves provided in the flow path from the liquefied gas tank to the compressor and the flow path from the bulk storage tank to the compressor. It is also preferable to provide a flow path that communicates with the bulk storage tank without using a compressor. Further, by using the electromagnetic four-way valve, the worker can work alone by radio signal or the like.

In this case, a flow meter for sending a signal when the liquid becomes zero is provided in a liquefied gas (liquid) flow path connecting the liquefied gas tank and the bulk storage tank.
When the liquefied gas (liquid) is recovered from the bulk storage tank by switching the electromagnetic four-way valve and recovering the liquefied gas (gas) by the transmission signal of the flow meter, the liquefied gas (liquid and gas) in the bulk storage tank is automatically collected. It can be completely recovered.

Since the flow meter usually has a fixed flow direction and cannot flow in the reverse direction, an electromagnetic four-way valve and a solenoid valve are combined before and after the flow meter, so that the flow time at the time of filling the liquefied gas can be reduced. It is preferable to make the flow into the flow meter from the same direction at any time of the recovery.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below based on an embodiment shown in FIGS. In the bulk trolley, a liquefied gas tank 1 is mounted on a chassis of a traveling vehicle 10, and equipment for supplying and recovering liquefied gas is housed in a valve instrument box 7 and a hose reel box 6.

A compressor 15, which is a power for liquid supply for supplying and recovering the liquefied gas, is provided on the chassis frame 8, and the compressor 15 is driven by obtaining power from the PTO of the transmission. I have. Reference numeral 11 denotes a power transmission propulsion shaft. Reference numeral 4 denotes a gearbox, which increases the PTO output speed by the compressor 15.
It is provided in order to match the proper rotation of. Also, 1
Reference numeral 4 denotes an electromagnetic clutch which can start and stop the compressor 15 by remote control.

An emergency shutoff valve 43 for gas and emergency shutoff valves 41 and 42 for liquid are provided below the liquefied gas tank 1. A flow path 61 is provided from the gas emergency shut-off valve 43, and is connected via a compressor 15 to a flow path 63 connected to the hose reel 22. And the compressor 15
The switching valve for switching the connection with the suction port to the flow path 61 or the flow path 63 is configured by combining the electromagnetic four-way valve 35 and the electromagnetic four-way valve 36.

That is, the electromagnetic four-way valve 35 is connected to the flow path 61, the flow path 66 to the suction port of the compressor 15, and the flow paths 62 and 64 to the electromagnetic four-way valve 36. Road 6
In addition to 2 and 64, it is connected to a flow path 63 and a flow path 65 to a discharge port of the compressor 15. The electromagnetic four-way valves 35 and 36 are respectively switched by energizing the solenoid. FIG. 2 shows a state where the solenoid is not energized.
Reference numeral 38 denotes a liquid trap for removing liquid components in the piping.

On the other hand, a flow path 51 is provided from the emergency cutoff valve 41 and is connected to a flow path 54 connected to the hose reel 21 via a flow meter 37. Since the inflow direction of the flow meter 37 is determined in the direction of the arrow shown in FIG. 2, the liquefied gas (liquid) is supplied from the liquefied gas tank 1 to the bulk storage tank 30 and from the bulk storage tank 30 to the liquefied gas tank 1. ) Is provided with an electromagnetic four-way valve 32, an electromagnetic valve 33, and an electromagnetic valve 34 so as to flow in the same direction (the direction of the arrow) in any case of recovering the above. That is, the electromagnetic four-way valve 32 is connected to the flow path 51, the flow path 53 to the flow meter 37, and the flow path 56 connected to the flow path 54, and does not pass from the flow path 51 through the electromagnetic four-way valve 32 and the flow meter 37. The solenoid valve 34 is provided in the bypass flow path 55,
Further, an electromagnetic valve 33 is provided in the flow path 53.

The solenoid valves 33 and 34 are released when energized. When supplying or recovering the liquefied gas, the hose 21a is connected to the bulk storage tank 30. As the flow meter 37, a device having a mechanism for sending a signal to that effect when the flow rate becomes zero while the liquefied gas (liquid) is being passed is used.

The emergency shut-off valve 42 is used when the liquefied gas tank 1 is filled with liquefied gas at the base.
The connected flow path is omitted. Further, a container base valve, a bleeder and other various valves are additionally provided, but these are the same as those conventionally provided on the bulk lorry, and are omitted here for the sake of clarity.

Next, the operation of the bulk truck configured as described above will be described. While traveling on the Bark lorry,
Gas emergency shutoff valve 43, liquid emergency shutoff valves 41 and 42
The electromagnetic switching valve 44 is closed. The electromagnetic four-way valves 32, 35, 36, the electromagnetic valves 33, 34, and the electromagnetic clutch 14 of the compressor 15 are not energized, and the positions of the electromagnetic four-way valves 32, 35, 36 are as shown in FIG. It has become.

First, the liquefied gas (liquid) is stored in the bulk storage tank 30.
The case of filling is described with reference to FIG. Hose 21a
The hose 22a is connected to the bulk storage tank 30, the electromagnetic clutch 14 is turned on, the compressor 15 is driven, and the electromagnetic four-way valve 32 and the electromagnetic valve 33 are energized and switched. Then, the emergency shutoff valve 41 and the gas emergency shutoff valve 43 are opened.

As a result, the liquefied gas (gas) in the bulk storage tank 30 is supplied to the hose 22a, the hose reel 22,
3, is sucked into the compressor 15 through the electromagnetic four-way valve 36, the flow path 62, the electromagnetic four-way valve 35, and the flow path 66, and is pressurized to make the flow path 65, the electromagnetic four-way valve 36, the electromagnetic four-way valve 35, the flow path 61 To the liquefied gas tank 1. Then, the gas pressure in the liquefied gas tank 1 is increased, and the liquefied gas (liquid) is
1 to flow path 51, electromagnetic four-way valve 32, flow meter 37, flow path 5
3. The pressure is fed to the solenoid valve 33, the flow path 54, the hose reel 21, and the hose 21a, and the bulk storage tank 30 is filled.

Next, a case where liquefied gas (liquid) is recovered from the bulk storage tank 30 will be described with reference to FIG. The electromagnetic clutch 14 is turned on, the compressor 15 is driven, and the electromagnetic four-way valve 35 and the electromagnetic four-way valve 36 are energized and switched, and further, the electromagnetic valve 34 is energized and switched. Then, the emergency shutoff valve 41 and the gas emergency shutoff valve 43 are opened.

As a result, the liquefied gas (gas) in the liquefied gas tank 1 flows through the flow path 61, the electromagnetic four-way valve 35, the flow path 62,
Electromagnetic four-way valve 36, piping 64, electromagnetic four-way valve 35, flow path 66
Through the flow path 6
5. It is sent to the bulk storage tank 30 through the electromagnetic four-way valve 36 and the flow path 63. Then, the gas pressure in the bulk storage tank 30 is increased,
The liquefied gas (liquid) in the bulk storage tank 30 is supplied from the hose 21 a to the hose reel 21, the flow path 54, the flow path 56, and the electromagnetic four-way valve 3.
2. The pressure gas is sent to the flow meter 37, the flow path 53, the electromagnetic valve 34, the flow path 55, and the flow path 51, and is collected in the liquefied gas tank 1.

Next, a case where the liquefied gas (gas) remaining in the bulk storage tank 30 is collected in the liquefied gas tank 1 will be described with reference to FIG. In the recovery operation of the liquefied gas (liquid) in FIG. 4, when the liquefied gas (liquid) is completely recovered, the flow meter 37 detects that the flow rate is zero and outputs a signal. Then, based on this signal, the electromagnetic four-way valve 3
5. The energization to the electromagnetic four-way valve 36 and the electromagnetic valve 34 is cut off, and each is switched. The electromagnetic four-way valve 35,
Switching between the electromagnetic four-way valve 36 and the electromagnetic valve 34 is performed by a timer for a certain period of time so that the liquefied gas (liquid) on the pipe from the bulk storage tank 30 to the liquefied gas tank 1 is completely recovered to the liquefied gas tank 1. And later.

When the electromagnetic four-way valve 35, the electromagnetic four-way valve 36, and the electromagnetic valve 34 are switched, the liquefied gas (gas) in the bulk storage tank 30 flows through the flow path 63, the electromagnetic four-way valve 36, the flow path 62, the electromagnetic four-way valve. The refrigerant is sucked into the compressor 15 through the passage 35 and the passage 66, is pressurized, and is collected in the liquefied gas tank 1 through the passage 65, the electromagnetic four-way valve 36, the electromagnetic four-way valve 35, and the passage 61.

On the other hand, when the liquefied gas (liquid) is to be received in the liquefied gas tank 1 at the base, a pipe 52 attached to the liquid emergency shut-off valve 42 is connected to the base as shown in FIG. Then, the gas emergency shutoff valve 43 is released, and the electromagnetic four-way valve 35 is energized and switched. When receiving the liquefied gas in the tank 1, the bulk lorry engine is stopped and the coupling with the tank on the base side is stopped.
7 and 68 are connected.

As a result, when the liquefied gas tank 1 is received, the liquefied gas (gas) in the liquefied gas tank 1 flows through the flow path 61, the electromagnetic four-way valve 35, the flow path 62, the electromagnetic four-way valve 36,
It is taken out without passing through the compressor 15 via the channel 63 and the coupling 67. The existing bulk storage tank 3
Some zeros do not have a gas port, which cannot be filled with the liquefied gas described with reference to FIG.

FIG. 6 shows an example in which liquefied gas can be filled even when the bulk storage tank 30 is not provided with a gas port. The difference from the above-described configuration (FIG. 2) is that the liquid feed pump 20 is provided in the flow path 51.
The liquid feed pump 20 is driven by providing a speed reducer that can take out two shafts from the PTO, connecting one shaft to the compressor 15 via an electromagnetic clutch, and connecting the other shaft to the liquid feed pump 20 via an electromagnetic clutch. Have gained by connecting. Note that two sets of the hydraulic switching valve and the hydraulic motor may be used alternately.

When filling the bulk storage tank 30 with the liquefied gas, the hose 21a is connected to the bulk storage tank 30, the electromagnetic clutch 14 is turned on, the liquid feed pump 20 is driven, and the electromagnetic four-way valve 32 and the electromagnetic valve 33 are connected. The emergency cutoff valve 41 is opened by switching the current.

As a result, the liquefied gas (liquid) in the liquefied gas tank 1 is sucked from the emergency shut-off valve 41 into the liquid feed pump 20 via the flow path 51, and the electromagnetic four-way valve 32, the flow meter 37, the flow path 53, the electromagnetic valve 33, the flow path 54, the hose reel 21, and the hose 21a are pressure-fed and filled into the bulk storage tank 30.

[0032]

As described above, according to the present invention, there is provided a compressor driven by power from the PTO of the transmission, and one of the suction port and the discharge port of the compressor is connected to the liquefied gas tank. And the other was connected to the bulk storage tank, and a switching valve was provided to switch the connection to the suction port of the compressor between the flow path from the bulk storage tank and the flow path from the liquefied gas tank,
The liquefied gas (gas) is sucked from the bulk storage tank, and the liquefied gas (liquid) is filled into the bulk storage tank by pumping to the liquefied gas tank of the bulk lorry. The liquefied gas (gas) is sucked from the liquefied gas tank and pumped to the bulk storage tank. Thereby, the operation of collecting the liquefied gas (liquid) into the bulk storage tank and further collecting the liquefied gas (gas) remaining in the bulk storage tank into the liquefied gas tank can be easily performed. Therefore, it is usually used as a vehicle for supplying liquefied gas to the bulk storage tank, and the liquefied gas in the bulk storage tank can be recovered without requiring any special operation in an emergency or the like.

[Brief description of the drawings]

FIG. 1 is a schematic side view showing an overall configuration as an embodiment of a bulk lorry of the present invention.

FIG. 2 is a piping diagram for supplying and recovering the liquefied gas.

FIG. 3 is an explanatory diagram showing a flow when the liquefied gas is supplied to a bulk storage tank.

FIG. 4 is an explanatory diagram showing a flow when a liquefied gas (liquid) is recovered from the bulk storage tank.

FIG. 5 is an explanatory diagram showing a flow when liquefied gas (gas) is recovered from the bulk storage tank.

FIG. 6 is an explanatory diagram showing a flow when the liquefied gas is supplied to a bulk storage tank by a liquid feed pump.

FIG. 7 is an explanatory diagram showing a flow when a liquefied gas tank is filled with a liquefied gas at a base.

FIG. 8 is a circuit diagram of a conventional bulk liquefied gas supply device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Liquefied gas tank 2 ... Transmission 3 ... PTO 4 ... Gearbox 5 ... Propulsion shaft 6 ... Hose reel box 7 ... Valve instrument box 8 ... Chassis frame 10 ... Traveling vehicle 11 ... Propulsion shaft 14 ... Electromagnetic clutch 14a ... Electromagnetic clutch 15 ... Compressor 20 ... Liquid feed pump 21 ... Hose reel 21a ... Hose 22 ... Hose reel 22a ... Hose 24 ... Hydraulic unit 25 ... Hydraulic pump 26 ... Hydraulic motor 27 ... Electromagnetic switching valve 28 ... Relief valve 29 ... Oil tank 30 ... Bulk storage tank 32 ... Electromagnetic four-way valve 33, 34 ... Electromagnetic valve 35, 36 ... Electromagnetic four-way valve 37 ... Flow meter 38 ... Liquid trap 41, 42 ... Liquid emergency shut-off valve 43 ... Gas emergency shut-off valve 44 ... Liquid level gauge 51 ~ 56 ... flow path (liquid) 61-66 ... flow path (gas) 67, 68 ... coupling

 ──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Katsuaki Nakai 1-1, Sanbonmatsu-cho, Atsuta-ku, Nagoya-shi, Aichi Japan (72) Inventor Naoya Obayashi No. 1, Mihonmatsu-cho, Atsuta-ku, Nagoya, Aichi No. 1 In Japan Vehicle Manufacturing Co., Ltd. (72) Inventor Kota Noguchi 1-1, Sanbonmatsucho, Atsuta-ku, Nagoya-shi, Aichi F-term in Japan Vehicle Manufacturing Co., Ltd. 3E073 AA01 AB01 DB01

Claims (3)

[Claims] In a bulk lorry installed on the ground side for supplying liquefied gas to a bulk storage tank or the like for storing liquefied gas such as LP gas, a compressor driven by receiving power from a PTO of a transmission is provided. One of the suction port and the discharge port is connected to the liquefied gas tank and the other is connected to the bulk storage tank, and the connection to the suction port of the compressor is switched between the flow path from the bulk storage tank and the flow path from the liquefied gas tank. A valve is provided to fill the liquefied gas (liquid) into the bulk storage tank by sucking the liquefied gas (gas) from the bulk storage tank and pumping the liquefied gas (liquid) to the liquefied gas tank of the bulk lorry, and sucking the liquefied gas (gas) from the liquefied gas tank to bulk The liquefied gas (liquid) is recovered to the liquefied gas tank by pumping to the storage tank, and the liquefied gas (gas) remaining in the bulk storage tank is recovered to the liquefied gas tank. Barukurori characterized in that the. The switching valve comprises two electromagnetic four-way valves provided in a flow path from the liquefied gas tank to the compressor and a flow path from the bulk storage tank to the compressor, and the liquefied gas tank and the bulk storage tank are connected to the compressor. The bulk lorry according to claim 1, further comprising a flow path that communicates without intervening. 3. A liquefied gas (liquid) flow path connecting the liquefied gas tank and the bulk storage tank is provided with a flow meter for sending a signal when the liquid becomes zero, and the flow rate is measured when the liquefied gas (liquid) is recovered from the bulk storage tank. 3. The bulk lorry according to claim 2, wherein the liquefied gas (gas) is also recovered by switching the electromagnetic four-way valve in response to a signal sent from the meter.