JP2005088930A - Liquid mixture preventive device of liquid transporting vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a liquid mixture preventive device to reduce a ratio of mixture of another liquid (coumarin content for example) included in a liquid (light oil for example) as much as possible. <P>SOLUTION: An atmosphere inlet 30 is provided, and a first check valve 31a, a two-way selector valve 32 and a second check valve 31b are sequentially placed on pipelines 33 and 34 on the downstream of the inlet 30 to constitute an atmosphere intake mechanism. The atmosphere intake mechanism is connected with the upstream end of a liquid supply main pipeline 9 from a liquid tank 1, and the air taken from the inlet 30 is fed to the main pipeline 9 of the liquid tank 1 to discharge the residual liquid in all lines. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a liquid mixture prevention device for a liquid transport vehicle, for example, a tank truck.

  In a liquid transport vehicle, such as a tank truck, a tank is divided into a plurality of chambers (compartments) by partition walls, and different liquids such as light oil, kerosene, heavy oil, etc. are separately provided in each compartment (tank loading chamber). May be mixed.

  Usually, two methods are used for unloading oil from a tank truck. In other words, the former unloading method has four directions by connecting one end of an oil supply hose to the discharge ports 27a and 27b shown in FIG. The cock 11 is switched so that it can be refueled by gravity and unloaded without the pump 12.

  Further, in the latter unloading method, an oil-resistant rubber-made oil hose 28a is connected to the tip of a pipe 28 of a tank truck similarly shown in FIG. Here, the power take-off 14 is driven to switch the four-way cock 11 to a discharge (oil supply) state. And the pump 12 mounted in a tank lorry vehicle is rotationally driven, and oil is supplied to an unloading destination.

  Here, in the former unloading method, since the tank 1 is completely emptied, the entire piping system is also emptied, and mixed liquid (mixed oil) is usually generated except for the dents in the piping. Absent. On the other hand, in the latter unloading method, the tank 1 and the piping system cannot be emptied, so that the oil type previously supplied is still clogged in all the piping. The liquid mixture (oil mixture) prevention device of a liquid transport vehicle of the present invention, for example, a tank lorry vehicle, is applied to a liquid transport vehicle (tank lorry vehicle) employing the latter unloading method.

  However, in an ordinary tank truck, when multiple oil types are loaded, piping and pumps from the tank to the filler port are shared, so when the oil type is switched (for example, light oil → kerosene, kerosene) → Light oil), mixing of different types of oil in the pipe will occur.

  Therefore, in the prior art, for example, the on-off valve opening / closing operation means provided in the oil supply pipe for supplying oil from the storage tank of the oil tank station to the tank truck, the oil is unloaded from the tank of the tank truck connected to the hatch of the tank truck. The oil type common to each of the opening / closing operation means of the on-off valve provided in the unloading piping and the opening / closing mechanism of the filler fitting that is connected to the unloading piping provided in the oil supply passage to the underground tank Including a common lock that restrains the member in the direction of closing the flow path for each flow path system, and having only one key for unlocking all these locks [Patent Document 1], The tank chamber has an operation handle for an unloading bottom valve in each of the tank chambers, and a bottom valve locking device that locks and releases the operation of the operation handle for each unloading bottom valve. Mixture prevention In operation, each bottom valve locking device has an operational relationship with the locking mechanism of the valve opening / closing handle attached to the loading arm on the loading station side, and each bottom valve locking device and the loading arm on the loading station side are connected to each other. Some of the locking devices of the attached valve opening / closing handles were formed so that the locks of other locking devices acted while the locking device was open [Patent Document 2].

  Moreover, there existed what prevented the mixed oil of a different kind of oil by providing a separate piping system and pump for every oil kind (light oil, kerosene).

  However, in the conventional system, a considerably complicated oil mixture prevention device is required, and the oil still remains in the dents, the four corners, etc. in the piping, and the oil type (for example, kerosene) completely supplied from the piping system immediately before. ) Could not be excluded, and mixing of a plurality of oil types occurred in the piping system.

  In addition, in the case of providing a separate piping system and pump for each of the latter oil types, mixing is eliminated, but a double (two sets) piping system, pump, etc. are required, which increases the size of the device. There was a drawback that the manufacturing cost (price) was very expensive.

In particular, regulations on so-called illegal light oil have recently become stricter.For example, the Tokyo Metropolitan Government Bureau of Environment and Taxation Bureau define `` illegal light oil '' as a mixture of light oil and heavy oil. Since the sulfur content contained therein increases and the PM concentration of automobile exhaust gas increases, it is subject to regulation. In the actual investigation of illegal diesel oil, samples are collected from the prescribed diesel oil and analyzed by the public inspection organization (for example, National Petroleum Institute of Japan, Quality Laboratory) to analyze the coumarin content contained in diesel oil. It is customary to ask. Here, the amount of coumarin contained in light oil is best at 0%, but the actual state is that a coumarin content up to 2% is allowed in consideration of the method of selling light oil, the structure of tank trucks, etc. .
Japanese Patent Laid-Open No. 10-035796 JP 11-314700 A

  The problem to be solved by the present invention is that different oil types remaining in the piping system are mixed in the piping system of a liquid transport vehicle such as a tank truck.

  The present invention introduces air into a piping system using an air pipe separately provided with a different kind of oil remaining in the piping system of a liquid transport vehicle such as a tank truck, and discharges the remaining oil type from the piping system, For example, the main feature is to reduce the coumarin content in the light oil as much as possible.

  According to the mixed liquid prevention device of the present invention, in a liquid transport vehicle, for example, a tank truck, a coumarin content in oil can be easily and reliably obtained by a simple mechanism and using a hydraulic device such as an existing pump. There is an advantage that it can be reduced to a value less than the specified value.

  FIG. 1 is an oil mixture prevention device, a tank, an oil supply system, and an explanatory diagram when the liquid mixture prevention device of the present invention is applied to a tank truck.

  As shown in FIG. 1, a main body barrel, a front end plate 2, and a rear end plate 3 that are horizontally installed on a chassis (not shown) of a tank truck (not shown) to which the mixed oil prevention device A of the present invention is applied. The tank 1 is composed of a plurality of compartments (loading chambers) 1a, 1b, 1c partitioned by partition walls 4a, 4b, 4c, and is different from inlets 5a, 5b, 5c provided on the top of the tank 1, respectively. Oil types (for example, light oil, kerosene, heavy oil) and the like are injected into the respective compartments 1a, 1b, 1c from the inlets 5a, 5b, 5c and mixedly loaded in the tank 1. Further, bottom valves 6a, 6b, 6c that are opened and closed by operation handles h are respectively disposed at the bottoms of the respective compartments 1a, 1b, 1c, and the bottom valves 6a, 6b, 6c are respectively connected to the pipe lines 8a, 8b, The pipes 8 a, 8 b, and 8 c are in fluid communication with the first main pipe 9. In addition, an emergency valve mechanism 17 is provided so that the bottom valves 6a, 6b, 6c can be shut off simultaneously in an emergency.

  Further, the first main pipe line 9 communicates with a pump 12 via a four-way cock (switching valve) 11 and a pipe line 13 communicated with the pipe line 10, and this pump 12 is mounted on a tank truck. The engine 16 is rotationally driven via a transmission 15 and a power take-off 14.

  On the other hand, a pipe 18 is connected to the four-way cock 11, and a filter 19, a pipe 20, a flow meter 22, a pipe 21, a three-way cock (switching valve) 23, and a pipe 21a are connected and arranged in this order. Thus, fluid communication with the conduit 25 is achieved. Here, two-way cocks (switching valves) 26a and 26b and discharge ports 27a and 27b are disposed on both sides of the pipe 25. These discharge ports 27a to 27b are used when the oil supply hose 28a is connected to supply oil directly to the unloading destination. Reference numeral 24 denotes a bypass line. Further, the pipe line 25 communicates with the oil supply nozzle 29 via the second main pipe line 28. Here, as will be described later, when the predetermined bottom valves 6a, 6b and 6c are opened, the cocks 11 and 23 are switched and the pump 12 is driven, the tank 1 is loaded in one of the compartments 1a, 1b and 1c. The oil type (for example, light oil) is sucked and supplied from the oil supply nozzle 29 to a predetermined location.

  In particular, in the liquid mixture preventing apparatus A for a liquid transport vehicle of the present invention, as schematically shown in FIG. 1, the air intake 30, the pipe 33, the first check valve 31a, the pipe 33a, and the two-way valve (switching valve). 32, a pipe line 34, and a second check valve 31b are connected to the upstream end of the first main pipe line 9 so as to be in fluid communication.

  Next, a refueling operation at the time of mixed loading of a liquid transport vehicle to which the mixed liquid preventing apparatus A of the present invention is applied, for example, a tank truck is described.

  For example, a case will be described in which light oil is mixed in the first chamber (section) 1a of the tank 1 shown in FIG. 1 and kerosene is mixedly loaded in the third chamber (section) 1c. Here, first, kerosene is supplied from the oil supply nozzle 29 by rotating the pump 12 from the third chamber (section) 1c of the tank 1 of the tank lorry vehicle at the oil supply site. At this time, the bottom valves 6a and 6b of the first chamber 1a and the second chamber 1b are closed, the bottom valve 6c of the third chamber (kerosene) 1c is opened, and the four-way cock 11 is switched to the discharge position. By this operation, the bottom valve 6c, the pipe 8c, the first main pipe 9, the pipes 10 and 13, the pump 12, the pipe 17, the pipe 18, the filter 19, the pipe 20, and the flow meter 22 in the third chamber 1c. Kerosene flows through the pipe 21, the three-way cock 23, and the pipes 25 and 28, and kerosene is supplied from a fuel supply nozzle 29 to a predetermined location. That is, the entire pipeline is filled with kerosene.

  Here, when the four-way cock 11 is switched to the suction position, the kerosene in the pipe enters the bypass pipe 24 from the three-way cock 23, and the pipe 18, the four-way cock 11, the pipe 10, and the first main pipe. Since the oil does not flow backward in the flow meter 22 by flowing kerosene into the bypass conduit 24, for example, returned to the loading chamber 1b from the conduit 8b through the bottom valve 6b, the flow meter 22 is not damaged. Can be prevented.

  Next, when the oil type is changed from kerosene to light oil, for example, the bottom valve 6a of the first chamber (light oil) 1a of the tank 1 is opened, and the second chamber (light oil) 1b and the third chamber are opened. The bottom valves 6b and 6c of the eyes (kerosene) 1c are closed. Here, the kerosene that is filled in the entire pipeline when the previous kerosene is supplied and remains in the pipeline is pumped to the third chamber (kerosene) 1c when the previous bottom valves 6a, 6b, 6c are operated. 12 is driven, and the lid of the inlet (manhole) 5c opened at the upper part of the tank 1 is opened from the fuel supply nozzle 29 and returned. According to the calculation, about 50 liters of kerosene is returned to the tank 1 at this time. Then, the kerosene remaining in all the pipes by switching the oil type from kerosene to light oil is pushed out from all the pipes by the newly supplied light oil and is discharged from the oil supply nozzle 29.

  However, even if the kerosene previously supplied by such an operation is pushed out of the pipe by the newly supplied light oil and discharged, for example, in the pipe structure, for example, in the pipe line 8a and the first main pipe line 9 There is a risk that kerosene will remain as residual oil in the absence (the amount of residual oil assumed to remain in the pipe at this time is approximately 4.1 liters in calculation).

For this reason, for example, kerosene is mixed with light oil, and according to the results of sample analysis, the content of coumarin (C ₉ H ₆ O ₂ ) is 2.5 to 4.3% (see [Table 1]). In any case, the allowable range of 2% is exceeded, which is a factor that produces so-called illegal light oil.

  Therefore, in the liquid mixture prevention device for a liquid transport vehicle of the present invention, for example, the oil mixture prevention device for a tank truck, as described above, the liquid mixture prevention device A is connected to the upstream end of the first main pipeline 9 as follows. The residual oil is discharged from the pipe by simple operation.

  First, the power take-off switch 14 is turned on while the engine 16 shown in FIG. 1 is driven. Next, the bottom valves 6a, 6b and 6c are respectively operated with the handle h to be in a closed state. Then, after opening the two-way valve 32 of the mixed liquid prevention device A, the lever of the oil supply nozzle 29 is grasped, and the atmosphere is taken into the pipe lines 33 and 34 and the first main pipe line 9 from the atmosphere intake port 30. From the line 9 to the loading chamber 1c, the four-way cock 11, the pipe 17, the pump 12, the pipe 18, the check valve 31a, the filter 19, the pipe 20, the flow meter 22, the pipe 21, the three-way cock 23, and the pipe The kerosene is discharged from the oil supply nozzle 29 to the kerosene loading chamber 1c through the injection port 5c until sufficient air enters through the passages 21a, 18, 25, 28 and the oil supply hose 28a (about 2 minutes or more). The amount of kerosene discharged is about 30 liters with a regular tank truck.)

  Next, the two-way valve 32 of the liquid mixture preventing apparatus A is closed.

  Then, in order to supply light oil instead of kerosene, the bottom valve 6 a of the light oil loading chamber 1 a is opened by operating the handle h, and then the pipes 18, 20, 21, downstream of the pump 12. Hold the lever of the oil supply nozzle 29 with kerosene remaining in the bypass line 24, lines 25 and 28 (the remaining amount at this time is about 20 liters in a normal tank truck), open the oil supply port, and operate the pump 12 Thus, the kerosene is discharged into the loading chamber 1c through the inlet 5c. By repeating these operations twice or more, the oil mixture ratio is further reduced.

  Thereafter, light oil is supplied from the oil supply nozzle 29 to a machine to be supplied (for example, a trailer vehicle).

  In particular, the liquid mixture preventing device of the liquid transport vehicle of the present invention, such as a tank lorry vehicle, can be attached to the tank of an existing tank lorry vehicle with an extremely simple configuration and procedure, and can utilize an existing pump 12 or the like. It can be operated.

  That is, as shown in FIGS. 1 and 2, the pipe line 34 of the liquid mixture preventing apparatus A having the above-described structure is connected to the bracket 1f and the vicinity of the upper guard fence 1d on the front end plate 2 side of the tank 1 and the lower shell sheet plate 1e. The pipe 34b is connected to the upstream end of the first main pipe 9 through the check valve 31b. Here, the bracket 1f may be welded to the protective fence 1d, but the bracket 34c is bolted to the shell sheet plate 1e as shown in FIG. Further, as shown in FIGS. 3 and 4, the pipe 34a and the pipe 34b constituting the pipe 34 are connected via a coupling 34e and attached to the front end plate 2 side, so that the tank lorry vehicle can There is an effect that the risk of the liquid mixture preventing device A being damaged is extremely reduced even if it is rear-projected or rolls over.

  The present invention can be applied not only to a tank truck, but also to a liquid transport vehicle or a liquid storage device that dislikes mixing of different kinds of liquids.

It is explanatory drawing which shows the example which implemented the liquid mixture prevention apparatus of the liquid transport vehicle of this invention to the tank lorry vehicle. It is a front view which shows the state which attached the liquid mixture prevention apparatus shown in FIG. 1 to the front and upper part of the front end plate of a tank truck. It is a side view of the liquid mixture prevention apparatus shown in FIG. FIG. 2 is an enlarged perspective view of a portion indicated by a round frame B in FIG. 1.

Explanation of symbols

A Mixed liquid (mixed oil) prevention device 1a, 1b, 1c Section (loading chamber)
DESCRIPTION OF SYMBOLS 1 Tank 2 Front end plate 3 Rear end plates 4a, 4b, 4c Partition walls 6a, 6b, 6c Bottom valve 9 First main pipe 12 Pump 14 Power take-off 16 Engine 28 Second main pipe 29 Refueling nozzle 30 Atmospheric intake 31a, 31b Check valve

Claims (5)

  An air intake is provided, and a first check valve, a two-way switching valve, and a second check valve are sequentially arranged in a pipe line downstream of the air intake to constitute an air intake mechanism, The inlet mechanism is connected to the liquid supply main line from the liquid tank, and the air taken from the air intake is supplied to the supply main line of the liquid tank to discharge the remaining liquid in the line. Liquid mixture prevention device.   The liquid mixture preventing apparatus according to claim 1, wherein the liquid mixture preventing apparatus is an oil mixture preventing apparatus for a tank lorry vehicle in which several types of oil are mixed.   The liquid mixture preventing apparatus according to claim 2, wherein the oil mixture preventing apparatus is attached to an upper portion of the front end of the tank truck. An engine, a power take-off, a liquid tank partitioned into several loading chambers, a bottom valve provided in each loading chamber of the liquid tank, a liquid supply line, an air intake, and a two-way switching valve; In a device comprising a liquid mixture prevention device connected to the pump, a pump and a liquid supply nozzle provided at the most downstream end of the liquid supply pipe line,
Drive the engine and turn on the power take-off to activate the pump,
Close each bottom valve,
Open the two-way selector valve of the mixture prevention device,
Open the liquid supply nozzle, introduce the atmosphere into the liquid supply line from the air intake port, and discharge the predetermined liquid through the inlet until the air taken into the predetermined loading chamber is introduced,
Close the two-way selector valve of the mixture prevention device,
After opening the predetermined bottom valve, the liquid remaining in the pipe downstream from the pump is discharged from the supply nozzle,
After that, another liquid is supplied to a predetermined location via a liquid supply pipe line.
A mixed liquid prevention method characterized by the above.   The liquid mixture preventing method according to claim 4, wherein the liquid is light oil, kerosene, or heavy oil mixed in a tank truck.

Images