JPH07110680B2 - Piping structure of tank lorry - Google Patents

Description

TECHNICAL FIELD The present invention relates to a piping structure of a tank truck in which the inside of a tank is divided into tank chambers. That is, for example, it relates to a piping structure in a tank truck that mixes, transports, and unloads liquids that are dangerous substances such as gasoline, light oil, and kerosene in each tank chamber in a tank.

"Prior Art" The conventional tank truck piping structure was as follows.

First, the one shown in the bottom view of FIG. 3 was used. That is, this piping structure is of a type in which the tank truck 1 is unloaded from both the left and right sides of the tank 2.
The bottom valves 4,4, are provided in the tank chambers 3,3, ... in the tank 2, respectively.
Is connected to the main pipe 5, one end of the main pipe 5 is connected to the main pipe 5, and the other end of the branch pipe 6 is connected to the main pipe 5. It is configured to include a side discharge pipe 9 that communicates between the discharge valves 7 and 8. Further, in a type that can be unloaded from both the left and right sides of the tank 2 and can be unloaded from the rear side of the tank 2, one end is further connected to the side discharge pipe 9 and the other end is connected. It had a piping structure with a rear discharge pipe 11 having a discharge valve 10 arranged at the rear end of the tank 2. In addition, 12, 12, ... are the tank 2
Is a partition wall that divides the tank chamber into each tank chamber 3, 3.

Secondly, as an improvement of the above-mentioned first conventional example, the one shown in the bottom view of the main part of FIG. 4 has been developed. That is, in this piping structure, in a type in which the tank 2 is unloaded from both sides, two-way switching valves 13 and 14 are provided near the connecting portion of the side discharge pipe 9 to the branch pipe 6, respectively. It was Further, in a type that can be unloaded from both sides of the tank 2 and can be unloaded from the rear side of the tank 2 as well, in the vicinity of the connection portion of the rear discharge pipe 11 with the side discharge pipe 9, The switching valve 15 was provided.

"Problems to be Solved by the Invention" By the way, the following problems have been pointed out in such a conventional example.

That is, in the first conventional example having the above-mentioned predetermined piping structure, a specific liquid such as gasoline loaded in the tank chamber 3 including any of the discharge valves 7, 8 or 10 is unloaded. At this time, the side discharge pipe 9 leading to the other discharge valve 7, 8 or 10
Alternatively, the liquid to be unloaded flows into and remains in the rear discharge pipe 11. After that, another tank room 3
When unloading another type of liquid loaded inside, such as kerosene, from any of the discharge valves 7, 8 or 10, the remaining liquid gasoline, which was the target of the previous unloading, would remain unloaded after this. However, an accident will occur in which the target kerosene mixes. Therefore, in such a piping structure, it is necessary to open the other discharge valve 7, 8 or 10 once before discharging the other type of liquid, for example, kerosene, after that, and to drain the residual liquid gasoline. . It has been pointed out that the work of extracting the residual liquid is troublesome and has a problem in efficiency, and it is dangerous and has a problem in safety.

Furthermore, in the second conventional example provided with the above-mentioned two-way switching valve 13, 14 or 15, the residual liquid is still present although it is reduced as compared with the above-mentioned first conventional example, and there is a problem. It was. That is, between the connection portion of the side discharge pipe 9 with the branch pipe 6 and the closed two-way switching valve 13 or 14,
Further, between the connection portion of the rear discharge pipe 11 with the side discharge pipe 9 and the closed two-way switching valve 15, or between the connection portion of the side discharge pipe 9 with the rear discharge pipe 11 and the discharge valve 7. In the meantime, residual liquid still existed, and there was also a problem in efficiency and safety. Further, the structure is complicated and there is a problem in terms of cost, and the switching operation of the two-way switching valve 13, 14 or 15 can be performed only from either of the left and right sides of the tank 2, respectively. However, the switching operation is troublesome and there is a problem in terms of work efficiency from this point as well.

The generation of the above-mentioned residual liquid will be described in more detail. As is well known, the tank truck 1 is used to transport liquid such as gasoline from an oil depot to each gas station, but the gas station is based on the Fire Service Act and the ground inside the station is not always horizontal like Kochi. Are obliged to be inclined. Therefore, when unloading at such a gas station, the tank truck 1 is always inclined due to the inclination of the ground, and the side discharge pipe 9 which is always horizontal is also in the width direction of the tank 2. That is, it is in a state of being inclined in the left-right direction.

Therefore, in the conventional piping structure of the tank truck 1,
The discharge valve 7 or 8 positioned on the upper side of such inclination or
When the unloading is performed from the 10 side, the above-mentioned residual liquid was remarkably generated on the discharge valve 7 or 8 or 10 side located on the lower side where the unloading is not performed on the opposite side. Conventionally, it has been attempted to put a stand under the tire of the tank truck 1 for each unloading to correct the inclination of the tank truck 1 to some extent to reduce the residual liquid. The use of the table is very cumbersome,
It was pointed out that the unloading work would be complicated.

In the conventional example, the above problems have been pointed out.

In view of such circumstances, the present invention has been made to solve the problems of the above-mentioned conventional example, and an L-type three-way switching valve and a T-type three-way switching valve are provided at a predetermined connecting portion of piping. In addition to being provided, by providing the operating parts of the operating mechanism on both sides of the tank, the residual liquid is swept away during unloading,
Another object of the present invention is to propose a tank lorry piping structure in which the operation of the switching valve, that is, the selection of the discharge direction can be performed from both sides of the tank.

"Means for Solving Problems" The technical means of the present invention for achieving this object are as follows.

First, the first invention is as follows.

This piping structure relates to a tank lorry in which the inside of the tank is divided into tank chambers, and is related to a type in which the tank is unloaded from both left and right sides of the tank.

That is, the main pipe is connected to each tank chamber via the bottom valve. One end of the branch pipe is connected to this main pipe. The side discharge pipe is connected to the other end of the branch pipe and communicates between discharge valves arranged on both left and right sides of the tank.

The main pipe is arranged along the longitudinal direction of the tank, the side discharge pipe is arranged along the width direction of the tank, and the branch pipe extends from one end side to the other end side. It is gradually descending.

An L-type three-way switching valve is provided at the connection of the side discharge pipe with the branch pipe to partition the flow passage from the upstream side to the downstream side and to switch between the straight traveling and the left and right traveling. The operating portion of the operating mechanism of the L-type three-way switching valve is provided on both left and right sides of the tank.

Next, the second invention is as follows.

This piping structure relates to a type that can be unloaded from both the left and right sides of the tank, and can be unloaded from the rear side of the tank. The following configuration is added to the configuration of the first invention described above.

That is, in this piping structure, one end is connected to the side discharge pipe, and the other end is further provided with a rear discharge pipe having a discharge valve arranged at the rear end of the tank,
The rear discharge pipe is arranged along the longitudinal direction.

Then, at the connection portion with the rear discharge pipe of the side discharge pipe, the flow path is divided from either upstream or downstream to go straight along the side discharge pipe or sideward to the rear discharge pipe. A T-type three-way valve that is switched over is provided. Further, the operation portion of this T-type three-way switching valve is also arranged on both left and right sides of the tank.

"Working" The present invention is constituted by such means, and therefore operates as follows.

In a tank of a tank truck, various liquids such as gasoline, light oil, and kerosene are mixedly loaded in each tank chamber and transported.

Then, in the first invention, unloading of a specific liquid is performed as follows.

That is, the bottom valve of the tank chamber in which the liquid is loaded is opened, and the operation portion of the operation mechanism is operated to direct the L-type three-way switching valve to the desired one of the left and right sides of the tank. It is switched so as to be formed, and the one discharge valve is opened.

Then, the liquid in the tank chamber is led to the outside from the one discharge valve through the bottom valve, the main pipe, the branch pipe, the L-shaped three-way switching valve, and the side discharge pipe.

At that time, the flow passage is formed by switching by the L-shaped three-way switching valve so as to be divided and formed only on the one side discharge valve side of the side discharge pipe, so that the side discharge pipe on the other discharge valve side is surely formed. It has been cut off. Therefore, the fact that the liquid to be unloaded flows into the side discharge pipe on the other discharge valve side and becomes the residual liquid after the end of the unloading is surely swept away.

Next, in the second aspect of the present invention, the discharge of the side portion of the tank is performed by operating the operation portion of the operation mechanism of the T-type three-way switching valve in accordance with the operation described in the first aspect of the invention. The discharge valve is opened so that a flow path is formed toward the valve or the discharge valve at the rear end.

Then, the liquid in the tank chamber is led to the outside from the discharge valve at the side portion or the discharge valve at the rear end portion through the T-type three-way switching valve in accordance with the description of the first invention described above. To be done.

Then, in that case, the flow path is in accordance with the description of the above-mentioned first invention, and further, by the T-type three-way switching valve, the side discharge pipe facing the discharge valve of the side part of the tank or the discharge of the rear end part of the tank is used. One of the rear discharge pipes facing the valve is securely partitioned and formed by switching. And since the other side discharge pipe or the rear discharge pipe is surely shut off, the liquid to be unloaded flows into the other side and becomes the residual liquid after the unloading is definitely wiped out. Will be.

As described above, the generation of the residual liquid at the time of unloading is prevented through the first invention and the second invention, but this is significant in view of the following circumstances. As is well known, tank trucks are used to transport liquids such as gasoline to gas stations, but gas stations are obliged to have the ground inclined rather than horizontal in accordance with the Fire Service Act. Therefore, when unloading at a gas station, the tank truck is tilted due to such a tilt, and the side discharge pipe is also tilted in the width direction of the tank, but when the unloading is performed from the discharge valve on the upper side of the tilt. However, the occurrence of residual liquid on the discharge valve side of the lower side where unloading on the opposite side is not performed is reliably prevented by the L-type three-way switching valve or the T-type three-way switching valve as described above.

Further, according to the first invention and the second invention, in the switching operation of the L-type three-way switching valve and the T-type three-way switching valve, the operation portions of the operation mechanism are arranged on both sides of the tank. It is now possible to do this from both the left and right sides, and it has become possible to freely select the ejection direction from any side.

[Examples] The present invention will be described below based on the examples shown in the drawings.

FIG. 1 is a bottom view of an essential part of the embodiment, and FIG.
FIG. 2 is a sectional view taken along the line II-II of the figure.

First, an outline of the piping structure will be described with reference to FIG.

The inside of the tank 2 of the tank truck 1 is divided into tank chambers 3,3, ... by partition walls 12,12, ... Along the width direction of the tank 2, and the bottoms of the tank chambers 3,3 ,. Valves 4, 4, ... Are provided. Then, on the outer surface of the bottom of the tank 2, main pipes 5 are arranged along the longitudinal direction, and the main pipes 5 are respectively connected to the tank chambers 3, 3, ... Via bottom valves 4, 4 ,. It is in communication. The branch pipe 6 has one end connected to the main pipe 5, is gradually inclined downward to form a flow path toward the other end, and is bent from the intermediate portion along the longitudinal direction of the tank 2. There is. The side discharge pipe 9 is connected to the other end of the branch pipe 6 in the vicinity of its central portion, and communicates between the discharge valves 7 and 8 arranged on both sides of the tank 2 so that the width direction of the tank 2 is increased. Are arranged along.

Further, in the illustrated example, a rear discharge pipe 11 is provided so that the tank 2 can be unloaded not only from the left and right sides but also from the rear side. The rear discharge pipe 11 has one end connected to the side discharge pipe 9 and a discharge valve 10 arranged at the rear end of the tank 2 at the other end, which is arranged along the longitudinal direction of the tank 2. It is set up.

The outline of the piping structure is as follows.

Next, the L-type three-way switching valve 16 and the like will be described.

An L-shaped three-way switching valve 16 that switches the flow path to either of the two directions is provided at the connection portion of the side discharge pipe 9 with the branch pipe 6. The L-shaped three-way switching valve 16 is, for example, a seal flange type three-way switching ball valve, which switches the flow path from upstream to downstream and switches from straight traveling to bilateral traveling.

That is, the L-shaped three-way switching valve 16 directs the flow path from the upstream side to the downstream side, and goes straight from the middle portion to the other end of the branch pipe 6 so far along the longitudinal direction of the tank 2 to the side discharge pipe 9
Is directed to either of the discharge valves 7 and 8 on both the left and right sides of the tank 2, that is, to the straight direction to the left or right side which is the width direction of the tank 2, and is switched.

The operation mechanism 17 of the L-type three-way switching valve 16 is as follows. That is, one end of the connecting rods 19, 19 such as rods is attached to the switching lever 18 of the L-shaped three-way switching valve 16, and the other ends of both connecting rods 19, 19 extend along the width direction of the tank 2. Each extends to both sides of the tank 2. At the other end, handles 20 and 20 that are operation units are attached, respectively. Reference numerals 21 and 21 denote support arms that are inserted near the other ends of the connecting rods 19 and 19 and function as guides, positioning, and holding. Then, by moving the handle 20 which is the operation part forward and backward, the switching lever is moved through the connecting rod 19.
18 is rotated, so that the L-shaped three-way switching valve 16 is appropriately switched.

The L-type three-way switching valve 16 and the like have such a configuration.

Next, the T-type three-way switching valve 22 and the like will be described.

That is, in the type of the illustrated example in which the entire piping structure is capable of unloading not only from the left and right sides of the tank 2 but also from the rear side, the connection portion of the side discharge pipe 9 with the rear discharge pipe 11 is
A T-type three-way switching valve 22 for switching the flow path between straight and sideways is provided. The T-type three-way switching valve 22 is, for example, a seal flange type three-way switching ball valve, and the flow path is directed from the upstream side to the downstream side and goes straight along the side discharge pipe 9 or to the rear discharge pipe 11. It is to switch to either one of the sideways. That is, the flow path goes straight along the side discharge pipe 9 in the width direction of the tank 2, that is, both left and right directions, or toward the rear discharge pipe 11 from the left-right direction to the rear side in the longitudinal direction of the tank 2. Either follow along or partition and switch to either of them. This T-type 3-way switching valve 22
The L-type three-way switching valve 16 and the above-mentioned L-type three-way switching valve 16 are connected to each other in the side discharge pipe 9 as shown in the figure.

The operating mechanism 23 of the T-type three-way switching valve 22 is as follows. That is, one end of a connecting rod 25, 25 such as a rod is attached to the switching lever 24 of the T-type three-way switching valve 22, and the other end of both connecting rods 25, 25 extends along the width direction of the tank 2. Each extends to both sides of the tank 2. At the other end, handles 26, 26, which are operating parts, are attached. Reference numerals 27 and 27 denote support arms that are inserted near the other end of the connecting rod 25 and function as guides, positioning, and holding. Therefore, by moving the handle 26, which is the operation unit, forward and backward, the switching lever 24 is moved through the connecting rod 25.
Is rotated, so that the T-type three-way switching valve 22 is appropriately switched.

The T-type three-way switching valve 22 and the like have such a configuration.

In the illustrated example, the operation mechanism 17 of the L-type three-way switching valve 16
Since the handle 20 and the handle 26 of the operating mechanism 23 of the T-type three-way switching valve 22 are arranged close to each other, there is an advantage that both can be operated near each other and convenient.

In the figure, 28 and 28 are subframes that support the tank 2, and 29 and 29 are frames that support the subframes 28 and 28.

The above is the description of the configuration.

Next, the operation and the like will be described.

In the tank 2 of the tank truck 1, various liquids such as gasoline, light oil, and kerosene are mixed and transported in the tank chambers 3, 3 ,.

Then, at the destination, the unloading of a specific liquid such as gasoline is first performed as follows.

First, the following operations are performed.

That is, the bottom valve 4 of the tank chamber 3 in which the gasoline is loaded is opened, and one of the handles 20 of the operating mechanism 17 is opened.
Is operated to switch the L-type three-way switching valve 16 so that a flow path is formed toward one desired side of the left and right sides of the tank 2, and the discharge valve 7 or 8 on the one side is opened.

Here, in the illustrated example, the T-shaped 3 is attached to the side discharge pipe 9.
Since the one-way switching valve 22 is provided, if the discharge valve 7 on this side is
When is opened, the T-type three-way switching valve 22 is switched straight ahead by operating the handle 26 of the operating mechanism 23.

Now, the gasoline in the tank chamber 3 is transferred from the tank chamber 3 to the bottom valve 4, the main pipe 5, the branch pipe 6, the L-type three-way switching valve 16, the T-type three-way switching valve 22 and the side discharge pipe. Via 9
It is led out from the discharge valve 7 or 8.

At that time, the flow path is formed by the L-shaped three-way switching valve 16 so that one of the side discharge pipes 9 and the other discharge valve 7 are partitioned and formed only on the 8 side, so that the other discharge valve 7 or 8 side is formed. The side discharge pipe 9 is surely shut off. Therefore, after the completion of the unloading of gasoline, the fact that gasoline flows into the side discharge pipe 9 on the other side of the other discharge valve 7 or 8 and becomes the residual liquid is surely wiped out.

In this way, the unloading is performed from either of the right and left sides inside the tank 2 as appropriate, but in the illustrated example, the unloading can be performed from the rear side of the tank 2 as follows.

That is, in the illustrated example, since the rear discharge pipe 11 and the T-type three-way switching valve 22 are provided, when the discharge valve 7 is opened, the operation is performed as described above.

On the contrary, when the discharge valve 10 of the rear discharge pipe 11 is opened, the above-described operation is performed and the handle 26 of the operation mechanism 23 is operated to switch the T-type three-way switching valve 22 so that the flow path is at the rear part. Face the discharge pipe 11. In this way, the gasoline in the tank chamber 3 is led out from the discharge valve 10.

Now, in this way, the flow path is changed by the T-type three-way switching valve 22.
A side discharge pipe 9 facing the discharge valve 7 on the side of the tank 2 or a rear discharge pipe 11 facing the discharge valve 10 at the rear end of the tank 2 is reliably partitioned and formed by switching.
Since the other side discharge pipe 9 or the rear discharge pipe 11 is surely shut off, the fact that gasoline flows into the other side and becomes the residual liquid after the unloading is surely swept away. become.

Further, when the above-mentioned L-type three-way switching valve 16 and the T-type three-way switching valve 22 are switched, the handles 20, 20, 26, 26, which are the operating portions of the respective operating mechanisms 17, 23, are provided on both sides of the tank 2. Since it is arranged, it can be performed from both the left and right sides of the tank 2, and the discharge direction can be freely selected from any side.

As described above, the generation of the residual liquid at the time of unloading is prevented, but the prevention of the generation of the residual liquid is significant in view of the following circumstances. That is, the tank truck 1 is used to transport liquid such as gasoline from the liquid tank to each gas station, as is well known. However, the gas station is always safe because the ground is horizontal in accordance with the Fire Service Law. Rather than being obliged to be inclined overall. Therefore, at the time of unloading at the gas station, the tank truck 1 is always inclined due to the inclination of the ground, and the side discharge pipe 9 which is always horizontal is also in the width direction of the tank 2, that is, the left-right direction. It will be in a state of leaning to.

Then, in such a tilted state, even when unloading is performed from the discharge valve 7 or 8 or 10 side on the upper side of the inclination, the discharge valve 7 or 8 on the lower side in which the unloading on the opposite side is not performed is performed. In the piping structure of the present invention, the residual liquid is generated on the 8 or 10 side as in the piping structure of this type of conventional example described above. By switching and partitioning, it will be surely blocked.

"Effects of the Invention" As described above, the piping structure of the tank truck according to the present invention has an L-shaped three-way switching valve at the predetermined connection portion of the piping, and further a T-shape.
By providing a mold type three-way switching valve and operating parts of its operating mechanism on both sides of the tank, generation of residual liquid is wiped out at the time of unloading, and operation of the switching valve, that is, selection of discharge direction. However, it is possible from both sides of the tank. Therefore, the accident that the residual liquid is mixed with other liquid after the fact is surely avoided, and the draining operation of the residual liquid is unnecessary, which is excellent in terms of efficiency and safety, and the structure is simple and the cost is also excellent. In addition, it is easy to operate the switching valve when unloading, and from this point also excellent work efficiency,
The effects of the conventional examples of this kind are remarkably large, for example, the problems existing in the conventional examples are eliminated.

[Brief description of drawings]

FIG. 1 is an enlarged bottom view of an essential part showing an embodiment of the piping structure of a tank truck according to the present invention. FIG. 2 is a sectional view taken along the line II-II in FIG. FIG. 3 is a bottom view showing the piping structure of the tank truck according to the conventional example. FIG. 4 is an enlarged bottom view of a main part showing a piping structure of a tank truck according to another conventional example. 1 ... Tank truck 2 ... Tank 3 ... Tank chamber 4 ... Bottom valve 5 ... Main pipe 6 ... Branch pipe 7 ... Discharge valve 8 ... Discharge valve 9 ... Side discharge pipe 10 ... Discharge valve 11 …… Rear discharge piping 16 …… L-type 3-way switching valve 17 …… Operating mechanism 20 …… Handle (operating part) 22 …… T-type 3-way switching valve 23 …… Operating mechanism 26 …… Handling (operating part)

Claims (2)

[Claims] 1. A piping structure in a tank truck in which the inside of a tank is divided into respective tank chambers, a main pipe communicating with each of the tank chambers via a bottom valve, and a branch having one end connected to the main pipe. And a side discharge pipe connected to the other end of the branch pipe and communicating between the discharge valves arranged on both sides of the tank, the main pipe being the longitudinal direction of the tank. Is disposed along the direction, the side discharge pipe is disposed along the width direction of the tank,
The branch pipe is gradually inclined downward from one end side to the other end side, and at the connection portion of the side discharge pipe with the branch pipe, the flow passage is directed from the upstream side to the downstream side to the straight side to the left and right sides. And an L-type three-way switching valve for switching the L-type three-way switching valve, and operating portions of an operating mechanism of the L-type three-way switching valve are provided on both sides of the tank, respectively. Piping structure for tank truck. 2. A piping structure in a tank truck in which the inside of a tank is divided into each tank chamber, the main pipe communicating with each of the tank chambers via a bottom valve, and a branch having one end connected to the main pipe. And a side discharge pipe connected to the other end of the branch pipe and communicating between the discharge valves arranged on both sides of the tank, the main pipe being the longitudinal direction of the tank. Is disposed along the direction, the side discharge pipe is disposed along the width direction of the tank,
The branch pipe is gradually inclined downward from one end side to the other end side, and at the connection portion of the side discharge pipe with the branch pipe, the flow passage is directed from the upstream side to the downstream side to the straight side to the left and right sides. An L-type three-way switching valve for switching between the two is provided, and operating portions of an operating mechanism of the L-type three-way switching valve are arranged on both sides of the tank, respectively, and the side discharge is provided. One end is connected to the pipe, and the other end is provided with a rear discharge pipe having a discharge valve arranged at the rear end portion of the tank, and the rear discharge pipe is arranged along the longitudinal direction. The side discharge pipe is connected to the connection with the rear discharge pipe either straightly along the side discharge pipe from the upstream side to the downstream side of the flow path or sideways toward the rear discharge pipe. A T-type three-way switching valve that divides and switches the crab The operating portion of the operating mechanism of the valve, characterized in that it is arranged on both sides of the tank, the piping structure of the tank truck.