JP2006125555A - Consumer bulk lorry - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a consumer bulk lorry enabling the automatic opening and closing of a shutoff valve concurrently served for acceptance, delivery, and emergency stop. <P>SOLUTION: In this consumer bulk lorry, the shutoff valve 3 concurrently served for acceptance, delivery, and emergency stop installed in an LP storage tank 3 mounted on a chassis is automatically opened and closed through an automatic pressurizing unit 4 operated by switch operation. The automatic pressurizing unit 4 comprises a pressurizing fluid supply means 5 and a pressure releasing opening and closing valve 6. The shutoff valve 3 is opened by receiving the supply of the pressurizing fluid from the pressurizing fluid supply means 5, and closed when the supply of the pressurizing fluid is stopped by the valve opening operation of the shutoff valve 6. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a consumer bulk lorry capable of automatically opening and closing a shut-off valve for receiving, dispensing, and emergency stop attached to an LP storage tank mounted on a chassis by a switch operation.

  In general, the basic operation of so-called bulk supply for supplying LP gas from a consumer bulk lorry to storage facilities (bulk storage tanks or bulk containers) installed on the premises of general houses, apartment houses, restaurants, etc. is generally as follows. Done in First, after pulling the side brake and operating the PTO to stop the vehicle, the driver (also the worker) gets out of the vehicle, opens the hose case on the left side of the vehicle, and performs emergency shut-off for receiving, paying out, and emergency stop. The valve is opened by operating the hydraulic hand pump lever.

  Next, take out the filling coupling, pull out the filling hose to the required length, connect the filling coupling to the bulk storage tank, confirm that its main valve is open, and then operate the exterior pump by radio operation. Fill with LP gas. When the predetermined amount of filling is completed, the pump is stopped by wireless operation. Then, the filling hose is removed and stored. After that, returning to the hose case again, the pressure relief valve provided in the vicinity of the hydraulic hand pump lever is manually opened to close the emergency shutoff valve, and then the hose case is closed. finish. In addition, a liquefied gas filling bulk lorry (consumer bulk lorry) that can be filled without a power supply facility and prevents gas leakage from the pump has been proposed (for example, see Patent Document 1).

JP 07-304379 A

  As described above, in the conventional consumer bulk lorries, the emergency shut-off valve has to be opened and closed by operating the hydraulic hand pump lever and the pressure relief valve in the hose case each time the bulk is supplied. Such manual operation requires a lot of labor and takes time, so that the workability is not good.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a consumer bulk lorry capable of automatically opening and closing a receiving and dispensing shut-off valve.

(1) The consumer bulk lorry according to the present invention automatically opens and closes the shut-off valve 3 for receiving and discharging provided in the LP storage tank 2 mounted on the chassis 1 through an automatic pressurizing unit 4 that is operated by a switch operation. A bulk lorry for consumer use
The automatic pressurizing unit 4 includes a pressurized fluid supply means 5 and a pressure release on / off valve 6, and the shutoff valve 3 is opened by receiving pressurized fluid from the pressurized fluid supply means 5. The on-off valve 6 is closed when the supply of the pressurized fluid is stopped by the valve opening operation.

  According to such a configuration, the automatic pressurizing unit 4 can be operated by the switch operation to automatically open and close the shut-off valve 3, which greatly increases the labor of the driver (cum worker) during bulk supply. Therefore, workability is greatly improved.

(2) The automatic pressurizing unit 4 may be controlled and driven by a control signal output from an interlock control circuit that has received an operation signal from the switch operation. In this way, a circuit in which the opening / closing operation of the shut-off valve is linked to the interlock control system can be formed, so that safety can be improved.

(3) The shutoff valve 3 activates the interlock control circuit when the door of the valve box 9 containing the receiving and dispensing valves attached to the LP storage tank 2 is opened at the time of dispensing. May be automatically closed. In this way, it is possible to prevent the occurrence of troubles such that the door of the valve box 9 is inadvertently opened during bulk supply and the LP gas leaks from the valve.

(4) The shut-off valve 3 is automatically closed when the interlock control circuit is activated when the temperature sensor 10 provided outside the LP storage tank 2 detects a temperature higher than a predetermined value. May be. In this way, it is possible to prevent the occurrence of trouble that the LP storage tank 2 is heated to ignite the LP gas.

(5) The shut-off valve 3 may be automatically closed when the interlock control circuit is activated when an impact detection sensor 11 attached to the chassis 1 detects a predetermined impact or more. . In this way, for example, when a large impact is received from another vehicle due to a collision, it is possible to prevent the occurrence of a large trouble such that LP gas ignites and explodes.

  The bulk lorry for consumer use of the present invention automatically opens and closes the shut-off valve for receiving, dispensing and emergency stop provided in the LP storage tank by the switch operation, thereby greatly reducing the labor of the driver (cum worker) during bulk supply. Workability is greatly improved.

The consumer bulk lorry according to the preferred embodiment of the present invention will be described below in detail with reference to the drawings.
1A is an explanatory diagram of an interlock control system, FIG. 1B is a flowchart of an LP gas pipe (shown by a solid line) and a hydraulic pipe (shown by a broken line), and FIGS. 2A to 2G are emergency cutoff valves. FIG. 3A is a plan view of a consumer bulk lorry, and FIG. 3B is a side view. As shown in these figures, this consumer bulk lorry is equipped with an LP storage tank 2 in a chassis 1 and supplied with LP gas at an LP gas bulk delivery base, and is installed on the site of ordinary houses, apartment buildings, restaurants, etc. Used for supplying LP gas to a storage facility (bulk storage tank or bulk container) (bulk supply), and at the lower part of the LP storage tank 2 are three emergency shut-off valves that function as receiving, dispensing and emergency stop combined ( A shutoff valve 3 of the present invention is provided.

  As shown in FIG. 1B, the three emergency shut-off valves 3 include a shut-off valve 31 that functions as an original valve for receiving and discharging, a shut-off valve 32 for return, and a shut-off valve 33 for equalizing pressure. These three emergency shut-off valves 3 are automatically driven and controlled by a control signal output from an interlock control circuit (provided on the interlock operation panel 7 in the cabin 43) that has received an operation signal by a switch operation. The pressure unit 4 automatically opens and closes three at the same time. For example, when “dispensing mode” is selected on the touch panel of the interlock operation panel 7, the three emergency shut-off valves 3 are automatically be opened. As will be described later, the emergency pressurization unit 4 can be manually opened and closed when a trouble occurs in the electric system, as will be described later.

  The automatic pressurizing unit 4 includes an electric hydraulic pump (hydraulic power unit, pressurized fluid supply means of the present invention) 5, a solenoid valve (opening / closing valve of the present invention) 6, and open / close valves 21, 22. When the hydraulic pressure (pressurized fluid) is supplied from the electric hydraulic pump 5 to each shut-off valve 31, 32, 33, the shut-off valves 31, 32 are connected to the shut-off valves 31, 32, 33, respectively. , 33 are simultaneously opened, and when the solenoid valve 6 is actuated (opened) and the hydraulic pressure supply line is depressurized, the return biasing force of the return spring incorporated in each shut-off valve 31, 32, 33 As a result, the shut-off valves 31, 32, 33 are simultaneously closed. When a trouble occurs in the automatic pressurizing unit 4, the hydraulic pressure is released by opening the pressure relief manual valve 24 provided at the terminal of the hydraulic pipe 23 (the rearmost part of the vehicle). Thus, the shut-off valves 31, 32 and 33 can be closed. Further, in a trial operation or the like, the automatic pressurizing unit 4 is operated by operating an open / close button (not shown) provided on the interlock operation panel 7 in the cabin 43 to automatically open / close the shut-off valves 31, 32, 33. You can also.

  According to such a configuration, when the bulk supply operation is performed, if the “dispensing mode” is selected on the touch panel of the interlock operation panel 7 by the driver, the three emergency shut-off valves 3 are automatically opened. Therefore, the labor required for lever operation as in the past can be saved, and the time required for opening and closing is reduced to a very short (about 3 seconds), so the workability and work efficiency during bulk supply are greatly improved. To do. Moreover, since each shut-off valve 31, 32, 33 is automatically opened and closed in conjunction with the interlock control system, safety can be improved.

  The interlock operation panel 7 will be described in detail in detail. The interlock operation panel 7 includes an interlock control circuit, a monitor (display of modes and abnormal states, etc.), a touch panel (input of each mode of running, receiving and paying out), etc. ), A wireless device (for reception) 8B (the wireless device on the transmission side is indicated by 8A), a machine side pump start / stop switch 54, a coupling attachment / detachment detection sensor (limit switch) 55 in the hose case 41, In addition to the gas detector 56 in the valve box 9, the limit switch 57 for detecting the open / closed state of the door of the valve box 9, an emergency stop switch 58, a liquid level indicator 59, a temperature sensor 10, an impact detector 11, a brake A device 62, an alarm buzzer 63 and the like are connected.

  The machine-side pump start / stop switch 54 (touch panel type) is provided with a changeover switch, a pump start switch, and a pump stop switch for switching the switch operation between “wireless operation” and “manual operation”. The gas detector 56 detects that the gas concentration in the valve box 9 has reached or exceeded a predetermined value (the gas concentration at the lower explosion limit). The emergency stop switch 58 is provided at the center on the right side of the vehicle and slightly in the lower front for emergency use (see FIG. 3A), but can also be operated wirelessly. The temperature sensor 10 is disposed outside the LP storage tank 2, for example, in the vicinity of the valve box 9 or the like, and detects when the temperature has risen to near the flash point. The impact detector 11 is disposed on the front and rear projecting portions of the vehicle, and detects when the vehicle receives an impact of a predetermined level or more due to a collision with another vehicle or a collision with another vehicle.

  The interlock control circuit is driven based on an interlock control program set and stored in advance, and when “travel mode” is set, a control signal for automatically closing each shut-off valve 31, 32, 33 is automatically applied. When the “accepting mode” and the “dispensing mode” are set while outputting to the pressure unit 4, a control signal for automatically opening each shut-off valve 31, 32, 33 is output to the automatic pressurizing unit 4. Further, when the occurrence of an abnormal situation is detected by the means for detecting the abnormal state, the gas detector 56, the temperature sensor 10, and the impact detector 11 during the setting of the “dispensing mode”, the abnormal situation is displayed on the monitor. Is generated and an alarm is generated by the alarm buzzer 63, and a control signal for automatically closing the shutoff valves 31, 32, 33 is output to the automatic pressurizing unit 4. Furthermore, when an emergency stop command is received from the emergency stop switch 58 or the radio device 8A provided in the vehicle, a control signal for automatically closing the shutoff valves 31, 32, 33 is output to the automatic pressurizing unit 4. And a control signal for stopping all the functions of the vehicle is output.

  The LP gas piping for performing bulk supply will be described with reference to FIG. 1B. Each of the shut-off valves 31, 32, 33 has manually operated main valves 71, 72, 73 that are always open. The LP gas piping (hereinafter referred to as piping) 74, 75, 76 connected to the shutoff valves 31, 32, 33 can be manually closed when trouble occurs in the hydraulic system. . The pipe 74 connected to the shut-off valve 31 for receiving and discharging is connected to the input side of the pipe 79 connected to the liquid take-in / take-out valve 78 via the strainer 77 and the external sealless pump (machine side pump) 80. Branches to the pipe 81. Reference numeral 82 denotes a bleeder valve attached to the liquid intake / extract valve 78. A flexible tube is used for the pipe 75.

  The pipe 83 connected to the output side of the machine-side pump 80 is branched into a pipe 84 for bulk supply, a pipe 75 for return, and a pipe 85 connected to the pressure gauge 86. A branch pipe 90 connected to the relief pipe 76 is connected to the LPG hose 89 wound around the hose reel 88 and before the LPG hose 89 is connected. A vent valve 91 is connected to the tip of the relief pipe 76. Further, a pipe 93 for a pressure gauge 92 is connected to the relief pipe 76 before a connection portion with the pipe 90. In addition, 94 is a flow meter, 95 is a stop valve, 96 is a main valve, 97 is a joint and a blow plug, 98 is a safety joint, 99 is a coupling with a liquid outflow prevention device, 100 is a heat exchanger, 101 is a quick Coupling. In addition, a safety valve 105 is provided in the upper part of the LP storage tank 2, and a float type liquid level gauge 106 and a thermometer 107 are provided in the lower part.

  The layout of the hydraulic piping system for the emergency shut-off valve will be described with reference to FIGS. 2A to 2G. The automatic pressurizing unit 4 is disposed on the left side of the chassis 1 between the hose case 41 and the valve box 9. The hydraulic piping 23 housed in an openable / closable casing and discharged from the automatic pressurizing unit 4 extends to the rear end of the vehicle along the left side portion of the chassis 1. Each of the shut-off valves 31, 32, 33 is connected to three branch pipes branched through the hydraulic pipe 23, and a pressure relief manual valve 24 is connected to the end of the hydraulic pipe 23. In addition, the electric hydraulic pump 5 is provided with plugs 17 and 18 (for pressurization and return) to which a manual pump (not shown) can be connected. The shut-off valves 31, 32, 33 can be opened and closed. In FIGS. 3A and 3B, reference numeral 52 denotes a fuel tank for traveling, and 53 denotes a battery.

  The basic work procedure for bulk supply of a consumer bulk lorry constructed as described above will be briefly described. First, after reaching the destination and pulling the side brake, the “payout mode” on the touch panel is selected ( The shut-off valves 31, 32, 33 are automatically opened). Next, after operating the PTO, the customer is selected. After completing the above-described work in the cabin, the driver goes out of the vehicle, stops the vehicle, and displays a warning sign. Next, the door of the hose case 41 is opened, the LPG hose 89 wound around the hose reel 88 is pulled out by a required length, the filling coupling 99 is connected to the bulk storage tank, and the original valve is open. After confirming this, the exterior pump 80 is activated by radio operation and filled with LP gas. When the predetermined amount of filling is completed, the pump 80 is stopped by wireless operation. When the LPG hose 89 is removed, wound and stored, and the door of the hose case 41 is closed, the bulk supply operation is completed. The shut-off valves 31, 32, 33 are automatically closed when the driver returns to the cabin 43 and sets the “travel mode” on the touch panel.

  As described above, according to the present embodiment, it is not necessary to manually operate the hydraulic hand pump lever and the pressure release valve as in the past during a series of operations at the time of bulk supply. Labor can be saved and workability is greatly improved. Note that the present invention is not limited to the embodiment, and can be freely changed in design or improved as necessary without departing from the spirit of the invention. For example, the automatic pressurizing unit 4 includes at least A pressurizing fluid supply means 5 and a pressure release on-off valve 6 are provided, the supply of pressurized fluid from the pressurization fluid supply means 5 opens the shut-off valve 3, and pressurization is performed by opening and closing the on-off valve 6. What is necessary is just to be comprised so that the shutoff valve 3 can be closed when supply of a fluid is stopped, and it does not ask | require of the structure and form of the pressurized fluid supply means 5 and the on-off valve 6. FIG.

FIG. 1A is an explanatory diagram of an interlock control system for a consumer bulk lorry according to an embodiment of the present invention, and FIG. 1B is a flowchart of LP gas piping and hydraulic piping. (A)-(g) is explanatory drawing of the hydraulic piping for the emergency shut-off valve. (A) is a top view of the bulk lorry for consumer use, (b) is a side view.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Chassis, 2 ... LP storage tank, 3 ... Shut-off valve, 4 ... Automatic pressurization unit, 5 ... Pressurized fluid supply means (electric hydraulic pump), 6 ... On-off valve (solenoid valve), 9 ... Valve box, 10 ... temperature sensor, 11 ... impact detection sensor

Claims (5)

The shut-off valve (3) for receiving and dispensing provided in the LP storage tank (2) mounted on the chassis (1) is automatically opened and closed via an automatic pressurizing unit (4) that is operated by a switch operation. A consumer bulk lorry,
The automatic pressurizing unit (4) includes a pressurized fluid supply means (5) and a pressure release on / off valve (6), and the shutoff valve (3) is added from the pressurized fluid supply means (5). A consumer bulk lorry, which is opened by receiving a supply of pressurized fluid and is closed when the supply of pressurized fluid is stopped by the opening operation of the on-off valve (6).   The consumer bulk lorry according to claim 1, wherein the automatic pressurizing unit (4) is controlled and driven by a control signal output from an interlock control circuit that receives an operation signal generated by the switch operation.   When the door of the valve box (9) containing the receiving and dispensing valves attached to the LP storage tank (2) is opened at the time of dispensing, the shutoff valve (3) is connected to the interlock control circuit. The consumer bulk lorry according to claim 2, which is automatically closed when activated.   The shut-off valve (3) is automatically closed when the interlock control circuit is activated when a temperature sensor (10) attached to the outside of the LP storage tank (2) detects a temperature above a predetermined level. The consumer bulk lorry according to claim 2.   The shut-off valve (3) is automatically closed when the interlock control circuit is activated when an impact detection sensor (11) attached to the chassis (1) detects an impact exceeding a predetermined value. The consumer bulk lorry according to claim 2.

Images