JP4563293B2 - Tanker - Google Patents

Description

  The present invention relates to a tank truck used for land transportation of various liquid substances such as fuel oil such as gasoline, fats and oils, and chemicals.

  In general, a tank mounted on a tank truck is divided into a plurality of front and rear liquid chambers. Each tank has a bottom valve with a bottom valve, and the bottom of each tank is opened and closed. A handle is provided, and an emergency shut-off valve is interposed in the vicinity of each supply / exhaust port to shut off the supply / exhaust port in the event of an unexpected situation. Each supply / discharge port is connected to a liquid supply pipe disposed below the tank, and the liquid is supplied to each liquid chamber through a liquid supply pump interposed in the liquid supply pipe, As for the discharge from each liquid chamber, a pump is similarly used for non-flammable liquids, but forced discharge is prohibited for flammable liquids such as gasoline and light oil, so that natural discharge by gravity is performed.

However, in the normal tank configuration, the piping structure including the flow path switching valve does not have to be very complicated in order to enable forced supply / discharge by the pump and natural discharge by gravity for each liquid chamber as described above. Therefore, the equipment cost was high. Therefore, as a means for simplifying the piping structure in such a tank lorry, the entire tank is mounted on the chassis in an inclined state where the rear side is lower than the front side, and the oil feed pipe is arranged along the inclined tank bottom. The oil supply pipe is connected in series with a supply / discharge port with a bottom valve of each liquid chamber, and a switch valve directly connected to the oil supply pump and a terminal open / close cock are connected in series with the oil supply pipe. It has been proposed (Patent Document 1).
Japanese Utility Model Publication No. 6-24397

  In this proposed configuration, by using the inclined arrangement of the on-board tank, forced supply / discharge and natural discharge for the plurality of liquid chambers can be performed by substantially one series piping path, and complicated piping as in the past can be obtained. Since it becomes unnecessary, there is an advantage that the equipment cost can be greatly reduced.

  However, in the tank lorry, when opening and closing the bottom valve of each liquid chamber, an operator climbs to the top of the tank and operates the bottom valve opening / closing handle. However, the worker who climbed to the top will stand unnaturally on the inclined surface. There was a concern that the balance of the body was easily lost, and this could lead to accidents such as falling. On the other hand, if the degree of inclination of the tank is reduced in order to reduce such danger, the inclination of the bottom of the tank will also be relaxed, so that the discharge performance in natural discharge decreases, especially when the residual liquid amount decreases. Emissions will slow down, resulting in a significant reduction in efficiency.

  In view of the above-mentioned situation, the present invention can perform supply and discharge by a pump and natural discharge with respect to a plurality of liquid chambers of a tank by a substantially single series piping path as a tank lorry of this type, and the bottom at the top of the tank. An object of the present invention is to provide a worker who can perform a valve opening / closing operation safely and walk and move based on a normal sense of equilibrium.

In order to achieve the above object, according to a first aspect of the present invention, the reference numeral in the drawings indicates that the inside of the mounting tank 1 is divided into a plurality of front and rear liquid chambers 10A to 10C. In a tank truck having a supply / exhaust port 3 with a bottom valve 2 at the bottom of 10C and having a bottom valve opening / closing handle 22 for each of the liquid chambers 10A to 10C on the top of the tank 1, the top surface 1a side of the tank 1 is substantially horizontal in the front-rear direction. The bottom side 1b has a downward slope from the front to the rear and has a shape in which the central part in the left-right direction is lowered, and each supply / discharge port 3 with the bottom valve 2 is located near the rear end of the liquid chamber. The supply / discharge port 3 is provided at the center in the left-right direction, and communicates with a liquid supply pipe 4 in the front-rear direction disposed along the bottom of the tank 1, and a liquid supply pump 5 is disposed at the rear end side of the liquid supply pipe 4. a selector valve 6 of the direction-changing flows have is interposed, more before and after the tank 1 Liquid chamber 10A~10C is, by increasing the longitudinal length as the front side of the liquid chamber, is characterized by comprising is set to approximately equal volume.

  According to the first aspect of the present invention, the bottom surface side of the mounting tank has a downward slope from the front to the rear, and the supply / exhaust port with the bottom valve of each liquid chamber is located at the lower central portion in the vicinity of the rear end of the liquid chamber. Since these supply and discharge ports are connected in series to the liquid supply pipes arranged along the bottom of the tank, the forced supply and discharge and the natural discharge for the plurality of liquid chambers are substantially one in series. It is possible to carry out by a route, the equipment cost can be greatly reduced by a simple piping configuration, and the slope on the bottom side is increased to improve the liquid discharge property at the time of natural discharge, so that the efficiency can be improved. Since the tank top surface is substantially horizontal in the front and back direction, an operator who climbs to the top of the tank for opening and closing the bottom valve can work and walk with a normal sense of equilibrium. Such as falls caused by a shift in the sense of equilibrium The late can be prevented.

In the tank having the above-described configuration, the top surface side is substantially horizontal in the front-rear direction and the bottom surface side has a downward slope from the front to the rear, so that the volume per unit length in the front-rear direction increases toward the rear. However, in the present invention , since the front and rear liquid chambers are made longer in the front-rear length, the plurality of liquid chambers are set to have substantially the same capacity, so that the liquid volume can be easily managed in the same manner as a normal tank truck.

  Hereinafter, a tank truck according to an embodiment of the present invention will be specifically described with reference to the drawings. 1 is a schematic side view of the entire tank lorry showing the tank portion in a longitudinal section, FIG. 2 is a cross-sectional plan view of the tank, FIG. 3 is a front view of the tank as viewed from the front side of the vehicle body, and FIG. is there.

  The tank 1 of the tank lorry TL has a cylindrical shape that is substantially oval in the left-right direction and is long in the front-rear direction. When mounted on the chassis F, the top surface 1a is substantially horizontal in the front-rear direction. The bottom side 1b has a shape that forms a downward slope from the front to the rear, and the front and rear (three in the figure) liquid chambers 10A to 10C are formed by the partition walls 11 curved so that the inside bulges rearward. It is partitioned.

  At the bottom of each of these liquid chambers 10A to 10C, a supply / exhaust port 3 with a bottom valve 2 is provided at the central portion in the left-right direction that is the lowest in the vicinity of the rear end of the liquid chamber, and is extended from each bottom valve 2 upward. An upper end portion of 21 protrudes upward through the tank wall, and a bottom valve opening / closing handle 22 is attached to the protruding upper end portion. In addition, in each of the liquid chambers 10A to 10C, there are four strip-shaped wave-breaking plates 12 that are long in the front-rear direction through the front-rear and left-right support columns 12a, and are vertically perpendicular to each other. The surfaces are arranged so as to face each other in the left-right direction. Reference numeral 13 denotes a manhole provided at the top of each of the liquid chambers 10A to 10C.

  Accordingly, a liquid feed pipe 4 extending in the front-rear direction along the left and right central portion is disposed on the lower surface side of the tank 1, and the supply and discharge ports 3 of the liquid chambers 10 </ b> A to 10 </ b> C are connected to the liquid feed pipe 4. In addition, a liquid feed pump 5 and a switching valve 6 for switching the flow direction are interposed on the rear end side of the liquid feed pipe 4 extending rearward from the rear end of the tank 1. 7 is an open / close valve that opens and closes the supply / discharge port 4a at the rear end of the liquid supply pipe 4.

  As the switching valve 6, a forced discharge position that is directly connected to the liquid supply pump 5 and forcibly discharges the liquid in the tank 1 from the supply / discharge port 4 a of the liquid supply tube 4, and the supply / discharge port of the liquid supply tube 4. It is possible to switch between a forced inflow position where the liquid introduced from 4a is forced into the tank 1 and a neutral position where the liquid circulates in the liquid feed pump 5, which is disclosed, for example, in Japanese Utility Model Publication No. 6-24397. The structure of the switching valve can be preferably used. Although not shown, each supply / exhaust port 3 of the liquid chambers 10A to 10C is provided with an emergency shut-off valve for shutting off the supply / discharge port 3 in an unexpected situation together with the bottom valve 2. ing. As this emergency shut-off valve, various structures conventionally used for tank trucks can be used including the structure disclosed in Japanese Patent No. 354153 of the present applicant.

  As shown in FIG. 3, the front end panel 1c of the tank 1 has a regular elliptical shape in which the upper and lower halves with the horizontal major axis m as a boundary have the same shape, and the shape dimension of the upper half of the regular elliptical shape is the tank. 1 is continuous from the front end to the rear end, but in the lower half of the tank 1, a downward slope Δh on the bottom side 1b is set so as to gradually bulge downward from the lower half of the regular elliptical shape of the front end panel 1c. Has been. Accordingly, the rear end panel 1d of the tank 1 has a substantially elliptical shape in which the vertical center line s is symmetrical on the left and right, but the horizontal major axis m is asymmetrical.

  Thus, the tank 1 has a larger volume per unit length in the front-rear direction due to such a shape change from the front side to the rear side. However, as shown in FIG. These liquid chambers 10A to 10C are set to have the same capacity by making the front and rear lengths L1 to L3 longer as L1> L2> L3 and the front side.

  Further, as shown in FIG. 4, the tank 1 is entirely encapsulated by a heat insulating material layer 8 except for the manhole 13 portion, and a heat pipe 9 is disposed on the lower surface side, and on the top surface side 1a. A protective frame 14 surrounding the top is rectangularly attached, and a horizontal tread plate 15 is disposed inside the protective frame 14. Reference numeral 16 denotes a support frame.

  In the tank lorry having the above-described configuration, the bottom surface 1b of the mounted tank 1 has a downward slope from the front to the rear, and the supply / exhaust port 3 with the bottom valve 2 of the plurality of liquid chambers 10A to 10C partitioned forward and backward. Since it is connected in communication with the liquid feed pipe 4 in the front-rear direction disposed along the bottom, the forced supply / discharge and the natural discharge of the liquid chambers 10A to 10C through the liquid feed pump 5 are substantially the same. This can be done with a series piping path of books, and the piping configuration is simplified accordingly, and the equipment cost can be greatly reduced. In addition, in this tank lorry, the top side 1a of the tank 1 is substantially horizontal in the front-rear direction, so that an operator who has climbed the top of the tank 1 for opening / closing the bottom valve 2 has a normal sense of equilibrium. Thus, it is possible to safely work and walk, and to prevent accidents such as falls caused by a shift in the sense of balance on an inclined surface.

  Further, in such a configuration, since the gradient of the bottom surface side 1b of the tank 1 can be increased, it is possible to increase the efficiency by increasing the gradient, thereby enhancing the liquid discharging property during natural discharging. is there. Further, as in this embodiment, if the front and rear lengths of the plurality of liquid chambers 10A to 10C of the tank 1 are set equal by increasing the front and rear lengths, it is as easy as a normal tank truck. Liquid volume can be controlled.

  In the above embodiment, the tank 1 is illustrated as having a substantially oval cross section in the left-right direction. However, the present invention is similarly applied to various different cross-sectional shapes such as a circle, a rectangle, a polygon, and an inverted trapezoid. it can. Further, in the present invention, various design changes other than the embodiment can be made for the detailed configuration such as the number of liquid chambers of the tank 1, presence / absence of heat retention, manhole shape, arrangement configuration of the wave breaker 12, frame structure, and the like.

It is the whole model side view which shows the tank part of the tank truck which concerns on one Embodiment of this invention with a longitudinal cross-section. It is a cross-sectional top view of the tank of the same tank truck. It is the front view seen from the vehicle body front side of the tank. It is a vertical side view of the tank part.

Explanation of symbols

TL Tank truck 1 Tank 1a Top side 1b Bottom side 10A to 10C Liquid chamber 11 Bulkhead 2 Bottom valve 22 Bottom valve opening / closing handle 3 Supply / exhaust port 4 Liquid feed pipe 5 Liquid feed pump 6 Switching valve

Claims (1)

In the tank lorry in which the inside of the mounting tank is divided into a plurality of front and rear liquid chambers, each tank has a supply / exhaust port with a bottom valve at the bottom, and a bottom valve opening / closing handle for each liquid chamber on the top of the tank.
The tank has a shape in which the top side is substantially horizontal in the front and back, the bottom side is downwardly descending from the front to the back, and the center of the bottom in the left-right direction is lowered,
Each bottom valve-equipped supply / discharge port is provided in the central portion in the left-right direction near the rear end of the liquid chamber, and these supply / discharge ports communicate with a liquid supply pipe in the front-rear direction disposed along the bottom of the tank. A liquid feed pump and a switching valve for switching the flow direction are installed on the rear end side of the pipe ,
A tank lorry wherein a plurality of liquid chambers in the front and rear of the tank are set to have substantially the same capacity by increasing the front and rear length of the liquid chamber on the front side .

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