JPH0764399B2 - Piping structure of tank lorry - Google Patents

Description

TECHNICAL FIELD The present invention relates to a piping structure of a tank truck in which a tank is divided into a plurality of tank chambers.

More specifically, the present invention relates to a piping structure of a tank truck that mixes and transports and unloads liquids that are dangerous substances such as gasoline, light oil, and kerosene in each tank chamber in the tank.

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

First, the one having the structure shown in the plan view of FIG. 4 was used. That is, this piping structure has a main pipe 5 connected to the tank chambers 3, 3, ... Formed in the tank 2 mounted on the tank truck 1 via bottom valves 4, 4 ,. One end is connected, and the other end is connected to a rear discharge pipe 7 whose other end is connected to a rear discharge valve 6 arranged at a lower portion of the rear end of the tank 2, and each one end is connected to a different position in the rear discharge pipe 7. In addition, each of the left and right side discharge pipes 10 and 11 connected to the left and right side discharge valves 8 and 9 disposed at the lower ends of both ends of the tank 2 is provided. It was configured to be able to unload from the left and right sides of the tank 2 and the rear part of the tank 2. In addition, 12, 12 ... are a plurality of tank chambers 3 in the tank 2,
It is a partition wall for forming 3 ...

Secondly, as an improvement of the above-mentioned first conventional example, a structure having the configuration shown in the plan view of the main part of FIG. 5 has been developed.
That is, this piping structure is opened and closed near the connection downstream side of the left and right side discharge pipes 10 and 11 in the rear discharge pipe 7 and near the connection part to the rear discharge pipe 7 of the left and right side discharge pipes 10 and 11, respectively. It had a configuration in which the valves 13, 13a, 13b, 13c were arranged.

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

That is, in the first conventional example having the above-mentioned predetermined piping structure, a specific liquid, such as gasoline, loaded in a certain tank chamber 3 from any of the discharge valves 6, 8 or 9 is used. When unloading, the downstream discharge pipes 7, 8 or 9 to the other discharge valves 6, 8 or 9 or the left and right side discharge pipes 10, 11
Gasoline will flow in and remain. Therefore, after the fact, when unloading various kinds of liquids, for example, kerosene loaded in the other tank chamber 3 from any one of the other discharge valves 6, 8 or 9 different from the above, in the state as it is, first, An accident will occur in which unloaded gasoline mixes with kerosene to be unloaded next. Therefore, in such a piping structure, next, before discharging another type of liquid, for example, kerosene, the other discharge valve 6, 8 or 9 must be opened once, and the downstream portion of the rear discharge pipe 7 or Left and right side discharge piping
It is necessary to remove the gasoline remaining in 10 and 11. It has been pointed out that the work of extracting the residual liquid is troublesome and has a problem in efficiency, and is dangerous and a problem in safety.

Further, in the second conventional example provided with the on-off valves 13, 13a, 13b, 13c described above, the residual liquid is still present although it is reduced as compared with the first conventional example described above. Was becoming. That is, when unloading from the rear discharge valve 6, the rear discharge pipe 7 in each of the left and right side discharge pipes 10 and 11
Between the connection part with and the open / close valves 13b and 13c in the closed state,
In addition, when unloading via the left side discharge pipe 10 (lower left side in FIG. 5), the connection between the rear discharge pipe 7 and the left side discharge pipe 10 and the on-off valve 13 in the closed state. In the meantime, when unloading via the right side discharge pipe 11 (upper right side in FIG. 5), the connection part of the rear discharge pipe 7 with the right side discharge pipe 11 and the open / close valve in the closed state 13a and between the connection portion of the left side discharge pipe 10 with the rear discharge pipe 7 and the on-off valve 13b in the closed state, there was residual liquid, 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 on-off valves 13, 13a, 13b, and 13c can be performed only from any one side portion of the tank 2, and therefore, at the time of unloading. Opening and closing operations are troublesome, and from this point also there was a problem in work efficiency.

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, in which a T-type three-way switching valve is provided at a predetermined connection portion of each discharge pipe and the operation mechanism of the T-type three-way switching valve is provided. By providing the operating parts on both sides of the tank truck,
At the time of unloading, it is possible to completely block the inflow of liquid into the discharge pipe connected to the other discharge valve, and the operation of each switching valve, that is, the selection of the discharge direction, can be performed from either side of the tank truck. The purpose is to propose a tank lorry piping structure that can be used.

"Means for Solving the Problem" The present invention has been made to achieve the above object, and the technical means is a piping structure of a tank truck in which a tank is divided into a plurality of tank chambers. A main pipe communicated with each of the plurality of tank chambers via a bottom valve, one end of which is connected to the main pipe, and the other end of which is connected to a rear discharge valve disposed below the rear end of the tank. One end of each of the rear discharge pipes is connected to a different position in the rear discharge pipe, and the other end of each of the rear discharge pipes is connected to each of the left and right side discharge valves respectively disposed at the lower portions on both sides of the tank. Each of the left and right side discharge pipes is provided, and a T-type three-way switching valve for switching a flow path is provided at a connection portion between each of the left and right side discharge pipes and the rear discharge pipe. Operation of 3-way switching valve operation mechanism The parts are arranged on both sides of the tank truck, respectively.

"Operation" Since the present invention comprises the above means, it operates as follows.
That is, each tank room in the tank, gasoline,
When loading and transporting various liquids such as light oil and kerosene, when unloading a specific liquid at the destination, for example, via one side discharge pipe connected to the upstream side of the rear discharge pipe First, by operating the operating portion of the operating mechanism of the T-type three-way switching valve provided at the connection portion of the side discharge pipe and the rear discharge pipe, the T-type three-way switching valve It is switched so that it is bent toward one side discharge pipe, then the bottom valve of the tank chamber in which a certain liquid is loaded is opened, and the side part at the tip of one side discharge pipe is opened. Open the discharge valve. Then, the specific liquid loaded in the tank chamber
From the tank chamber to the bottom valve, main pipe, upstream of the rear discharge pipe,
The T-type three-way switching valve provided on the upstream side of the rear discharge pipe, one side discharge pipe connected to the changeover valve, and the side discharge valve connected to the tip end of the valve are unloaded. And at that time, the flow path is the T-shaped 3 provided on the upstream side of the rear discharge pipe.
Since the one-way switching valve is formed so as to switch to only one side discharge pipe side connected to the three-way switching valve, the flow path to the downstream side of the rear discharge pipe is surely blocked. The liquid to be unloaded does not flow into the downstream portion of the rear discharge pipe and remains as the residual liquid after the end of unloading.

Further, when unloading via the other side discharge pipe connected to the downstream side of the rear discharge pipe, the T-type three-way switching valve provided on the upstream side is used as an operating portion of its operating mechanism. Is operated so that the flow passage is formed so as to go straight along the rear discharge pipe, and the T-type three-way switching valve provided on the downstream side is operated in accordance with the above-mentioned operation so that the flow passage is Switching so that it is bent toward the side discharge pipe,
Next, the bottom valve of a specific tank chamber is opened, and the discharge valve at the tip of the other side discharge pipe is used. Then, the liquid in the tank chamber is unloaded from the side discharge valve at the tip thereof via the T-type three-way switching valve on the downstream side and the other side discharge pipe in accordance with the above-mentioned route. At that time, the upstream T-type three-way switching valve allows the flow path to one side discharge pipe side, and the downstream T-type three-way switching valve allows the downstream side rear discharge pipe to flow. Since the flow path is surely blocked, the liquid to be unloaded does not flow into the one side discharge pipe and the rear discharge pipe downstream from the downstream T-type three-way switching valve.

Also, when unloading via the rear discharge pipe, each T
The flow path of the mold three-way switching valve is switched so as to be formed straight along the rear discharge pipe according to the above operation, and then the bottom valve of a specific tank chamber is opened and the rear discharge valve is opened. As a result, the liquid in the tank chamber is unloaded from the rear discharge valve. Also at this time, since the flow path to each side discharge pipe side is surely blocked, the liquid to be unloaded does not flow into each side discharge pipe.

Further, since the operation portion of the operation mechanism is arranged on both side portions of the tank lorry, the switching operation of each T-type three-way switching valve can be performed from either of the left and right side portions of the tank lorry, so that the discharge direction can be selected. It can be performed freely from any side.

"Example" Hereinafter, the present invention will be described based on an example shown in the drawings.

FIG. 1 is a plan view of an essential part of the embodiment, and FIG. 2 is a plan view of FIG.
Sectional views taken along the line II-II and FIGS. 3A and 3B are explanatory views of the operation of the T-type three-way switching valve.

First, the 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 a plurality of tank chambers 3, 3, ... By partition walls 12, 12 ... Provided along the width direction of the tank 2, and the bottoms of the respective tank chambers 3, 3 ,. Valves 4, 4, ... Are provided. A main pipe 5 is arranged below the bottom of the tank 2 along the longitudinal direction of the tank 2, and the main pipe 5 is connected to the tank chambers 3 and 3 via the bottom valves 4 and 4 ... It is connected to ...

The rear discharge pipe 7 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 in the vicinity of the connecting portion in the longitudinal direction of the tank 2. The other end of the tank 2 is connected to a rear discharge valve 6 disposed below the rear end of the tank 2.

The left and right side discharge pipes 10 and 11 are arranged along the width direction of the tank 2 with their one ends connected to positions close to each other in the central portion of the rear discharge pipe 7. In the embodiment, the left side discharge pipe 10 is provided upstream of the rear discharge pipe 7.
(The lower left side in FIG. 1), and the right side discharge pipe 11 (upper right side in FIG. 1) is connected to the downstream side close to the left side discharge pipe 10, and the other side discharge pipes 10 and 11 are connected. The ends are connected to left and right side discharge valves 8 and 9 which are respectively arranged at lower portions on both sides of the tank 2.

The outline of the piping structure is as follows.

Next, the T-type three-way switching valve and the like respectively arranged at the connection portions of the rear discharge pipe 7 and the left and right side discharge pipes 10, 11 will be described.

A flow path is provided at the connection between the rear discharge pipe 7 and each of the left and right side discharge pipes 10 and 11 either on the downstream side of the rear discharge pipe 7 or on the left and right side discharge pipes 10 and 11 respectively. T-type three-way switching valves 15 and 15a for switching between the two are provided. These T-type 3-way switching valves 15 and 15a are, for example, seal flange type 3
A one-way switching ball valve is used, and the flow passage is directed from upstream to downstream so as to go straight to the downstream side along the rear discharge pipe 7, or to bend to the left and right discharge pipes 10 and 11 side. It is something to switch. Each of these T-type 3-way switching valves
Although 15 and 15a are provided at a slight distance in the embodiment, the T-type three-way switching valves 15 and 15a may be connected to each other.

And the operating mechanism 16, 1 of these T-type three-way switching valves 15, 15a
6a is as follows. That is, one ends of connecting rods 18, 18, 18a, 18a such as rods are pivotally attached to the switching levers 17, 17a of these T-type three-way switching valves 15, 15a, and the connecting rods 18, 18, 18a are connected. , 18a are arranged along the width direction of the tank 2, and the other ends thereof extend to both sides of the tank truck 1. The other end is provided with handles 19, 19, 19a, 19a, which are operating portions, respectively. 2
0, 20, 20a, 20a is inserted through the vicinity of the other end of the connecting rod 18, 18, 18a, 18a, and its guide, a stopper mechanism (not shown) provided between the connecting rod 18, 18a and each other. The support arms function as switching positioning and holding of the T-type three-way switching valves 15 and 15a.
The base ends of a and 20a are fixed to the subframes 21 and 21, respectively. Therefore, as shown in FIGS. 3a and 3b, by moving the handles 19 and 19a, which are the operating parts, forward and backward, the switching levers 17 and 17a are rotated 90 ° via the connecting rods 18 and 18a.
Therefore, the T-type three-way switching valves 15 and 15a are switched.

The T-type three-way switching valves 15, 15a, etc. are configured as described above.

Therefore, in the illustrated example, each T-type three-way switching valve 15, 15
Since the handles 19 and 19a of the operating mechanism 16 and 16a of a are disposed at the positions close to each other, there is an advantage that the respective T-type three-way switching valves 15 and 15a can be conveniently operated near each other.

In the figure, 22 and 22 are chassis frames.

The above is the description of the configuration.

Next, the operation and the like will be described.

Each tank chamber 3, 3 of the tank 2 in the tank truck 1 ...
For example, when various liquids such as gasoline, light oil, and kerosene are mixed and transported, and at the destination, first, when unloading a certain liquid, for example, gasoline from the rear discharge valve 6, Various operations are performed. That is, first, as shown in FIG. 3A, the handle 1 of either one of the operating mechanisms 16 and 16a.
9 and 19a are operated to switch the T-type three-way switching valves 15 and 15a in a direction in which their flow paths go straight along the rear discharge pipe 7, and then the tank chamber 3 in which gasoline is loaded. The bottom valve is opened and the rear discharge valve 6 is opened.

Then, the gasoline in the tank chamber 3 passes through the bottom valve 4, the main pipe 5, the rear discharge pipe 7 from the tank chamber 3, and the rear discharge valve 6
Be unloaded from.

At that time, the flow passages are formed by the T-type three-way switching valves 15 and 15a only in the direction that goes straight along the rear discharge pipe 7, and the flow passages to the left and right side discharge pipes 10 and 11 are formed. Since it is reliably shut off, gasoline will not flow into and remain in the left and right side discharge pipes 10 and 11 at the end of unloading of gasoline.

In addition, for example, when unloading gasoline from the left side discharge valve 8, first, the T-type three-way switching valve 15 is subjected to the above-mentioned operation in the direction in which its flow path is directed to the left side discharge pipe 10 (first Three
Then, the bottom valve 4 of the tank chamber 3 in which gasoline is loaded is opened, and the left side discharge valve 8 is opened. Then, the gasoline in the tank chamber 3 is unloaded from the left side discharge valve 8 through the bottom valve 4, the main pipe 5, the upstream portion of the rear discharge pipe 7, the left side discharge pipe 10 from the tank chamber 3.

At that time, the flow path is formed by the T-type three-way switching valve 15 so as to be switched only in the direction toward the left side discharge pipe 10 side, and to the rear discharge pipe 7 side downstream from the T-type three-way switching valve 15. Since the flow passage is reliably blocked, gasoline will not flow into and remain in the rear discharge pipe 7 downstream of the T-type three-way switching valve 15 after the end of unloading of gasoline.

Further, for example, when unloading gasoline from the right side discharge valve 9, first, the T-type three-way switching valve 15 and 15a are respectively subjected to the above-mentioned operation, and the T-type three-way switching valve 15 is The flow path is switched to a direction in which the flow path goes straight along the rear discharge pipe 7 (state of the T-type three-way switching valve 15 in FIG. 3A), and the T-type three-way switching valve 15a is connected to the right side discharge pipe. 11 (the state of the T-shaped three-way switching valve 15a in FIG. 3b) is switched to, and then the bottom valve and the right side discharge valve 9 of the tank chamber 3 in which gasoline is loaded are opened, where the tank chamber is opened. The gasoline in 3 is unloaded from the right side discharge valve 9 through the bottom valve 4, the main pipe 5, the upstream part of the rear discharge pipe 7, the T-type three-way switching valves 15 and 15a, and the right side discharge pipe 11.

Also at this time, the T-type three-way switching valves 15 and 15a reliably block the flow passage to the left side discharge pipe 10 and the T3 one-way switching valve 15a to the downstream rear discharge pipe 7. Gasoline will not flow into and remain in the pipes 10 and 7.

Furthermore, the switching valves 15, 1 of the T-type three-way switching valves 15, 15a described above are
The switching operation of 5a can be performed from either the left or right side of the tank truck 1 since the handles 19, 19, 19a and 19a, which are the operating portions of the operating mechanisms 16 and 16a, are arranged on both sides of the tank truck 1. Therefore, the discharge direction can be freely selected from any side.

[Advantages of the Invention] As described above, the piping structure of the tank truck according to the present invention is provided with the T-type three-way switching valve at each predetermined connection portion of the piping, and the operation portions of the operation mechanism are provided on both sides of the tank truck. Since it is eliminated that residual liquid is generated during unloading, and operation of each switching valve, that is, selection of discharge direction is possible from both sides of the tank lorry, residual liquid is After the accident, it is possible to avoid accidentally mixing with other liquids, and it is not necessary to extract the residual liquid, which is very efficient and excellent in safety. Moreover, the structure is simple and the cost is excellent. The operation of the switching valve at the time of unloading is also easy, and the work efficiency is also excellent from this point, and the problems that the conventional example of this kind has are cleaned up. Great There is

[Brief description of drawings]

1 to 3 show an embodiment of the piping structure of a tank truck according to the present invention. FIG. 1 is an enlarged plan view of a main part, and FIG. 2 is a line II-II of FIG. 3A and 3B are sectional views of the T-type three-way switching valve along the arrow. FIG. 4 and FIG. 5 respectively show a piping structure of a tank truck according to a conventional example. FIG. 4 is a plan view and FIG. 5 is an enlarged plan view of a main part of another conventional example. 1 …… Tank truck 2 …… Tank 3 …… Tank chamber 4 …… Bottom valve 5 …… Main pipe 6 …… Rear discharge valve 7 …… Rear discharge pipe 8 …… Left side discharge valve 9 …… Right side discharge valve 10 ...... Left side discharge pipe 11 ...... Right side discharge pipe 15, 15a ...... T-type 3-way switching valve 16, 16a ...... Operating mechanism 17,17a ...... Switching lever 18,18a ...... Connecting rod 19,19a ...... Handle (operating part) 20, 20a …… Support arm

Claims (1)

[Claims] 1. A tank truck piping structure in which the inside of a tank is divided into a plurality of tank chambers, wherein a main pipe is connected to each of the plurality of tank chambers via a bottom valve, and one end is connected to the main pipe. In addition, the rear discharge pipe having the other end connected to the rear discharge valve disposed below the rear end of the tank, and one end of each of the rear discharge pipes connected to different positions in the rear discharge pipe, The left and right side discharge pipes connected to the left and right side discharge valves respectively disposed at the lower portions on both sides of the tank, and the left and right side discharge pipes and the rear discharge pipe. The connecting portion is provided with a T-type three-way switching valve for switching the respective flow paths, and the operating portions of the operating mechanism of the T-type three-way switching valve are respectively disposed on both sides of the tank truck. Characteristic tank low Piping structure of.