JPH0142560Y2 - - Google Patents

Description

[Detailed description of the invention] (a) Industrial application field The present invention is used in the field of tank trucks having discharge piping.

(b) Conventional technology In the conventional piping structure, as shown in Fig. 3, the piping of each chamber is connected through a main piping that extends in the front and back direction.
A sub-piping is provided perpendicularly below the center of the main piping, branched from the center of the main piping, and a connecting pipe with a four-way valve and a pump interposed therein is connected to the sub-piping.

However, with the above structure, even in the case of self-weight discharge, the liquid passes through the four-way valve, resulting in poor discharge efficiency and long discharge time.Also, the main piping is slanted forward to improve discharge efficiency, so it is difficult to use the main piping compared to the connecting piping. The previous main piping had the disadvantage that liquid remained.

(c) Problems that the invention aims to solve This invention solves the above-mentioned drawbacks by connecting a connecting pipe branched from the front part of the main pipe that drops forward to the sub-piping, and connecting the connecting pipe from four directions. This system is equipped with a valve and a pump, and has a branched bypass pipe that bypasses the four-way valve.

(d) Means for Solving the Problems The present invention involves slanting the entire main piping that communicates with each chamber of the tank in a forward-downward direction, and providing a sub-piping that extends laterally below the main piping. A connecting pipe branched from the front is connected to the sub-piping by interposing a four-way valve and a pump downward at the rear, and furthermore, the connecting pipe is connected to the sub-piping by bypassing the four-way valve and the pump. This invention relates to a piping structure for a tank lorry that is provided with bypass piping equipped with an on-off valve.

(e) Embodiment An embodiment will be described below with reference to the drawings. Reference numeral 1 denotes a tank lorry, and the tank lorry 1 has a tank 3 mounted on a vehicle body 2.

A bottom valve 5 is provided at the bottom of each chamber 4 of the tank 3, and each bottom valve 5 is connected to a main pipe 6 that extends in the front-rear direction and is slanted forward and downward as a whole.

A sub-piping 7 extending in the left-right direction is provided below the center of the main piping 6, and on-off valves 8 are provided at both ends of the sub-piping 7.

A connecting pipe 9 branched from the front part of the main pipe 6 is connected to the sub-piping 7 in a state where it is inclined backwardly downward.

A four-way valve 10 and a pump 11 are interposed in the connecting pipe 9, and a bypass pipe 12 that bypasses the four-way valve 10 and the pump 11 is branched, and the bypass pipe 12 has an on-off valve 13. Its end is connected to sub-piping 7.

The present invention has the above-mentioned structure, and the operation will be explained next. First, when pump discharge is performed, the on-off valve 13 is closed and the bottom valve 5 is closed while the pump 11 is started.
By opening the on-off valve 8 at the same time as opening the chamber 4...
The liquid in... is the main pipe 6, the connection pipe 9, and the 4-way valve 1.
0, pump 11, and sub-piping 7.

Next, when emptying the dead weight, open the on-off valve 13 and then open the bottom valve 5 and the on-off valve 8 to remove the chamber 4.
The liquid is discharged by weight through the main pipe 6, the connection pipe 9, the bypass pipe 12, and the sub pipe 7.

When storing liquid in the chamber, close the on-off valve 13 and switch the four-way valve 10, open the on-off valve 8 and start the pump 11, and the liquid will flow through the sub pipe 7, connection pipe 9 and main pipe 6. be accommodated.

(f) Effect of the invention As described above, the invention branches the connecting pipe from the front part of the main pipe, and further connects the four-way valve from the connecting pipe.
Since the bypass piping that bypasses the pump is branched, the dead weight can be discharged in a short time without interfering with pump discharge, making it possible to improve work efficiency.

Further, it is possible to eliminate residual liquid in the entire main piping.

[Brief explanation of the drawing]

FIG. 1 is an overall view, FIG. 2 is a piping diagram, and FIG. 3 is a conventional example. 3 is a tank, 5 is a bottom valve, 6 is a main pipe, 7 is a sub pipe, 9 is a connecting pipe, 10 is a four-way valve, 11 is a pump, 12 is a bypass pipe, and 13 is an on-off valve.

Claims (1)

[Scope of utility model registration request] The entire main pipe that communicates with each chamber of the tank is tilted forward and downward, sub-pipes are provided below the main pipe that extend laterally, and connecting pipes branch from the front of the main pipe in four directions downward and backward. A tank lorry equipped with a valve and a pump to communicate with the sub-piping, and further provided with a four-way valve, a bypass pipe that bypasses the pump and communicates with the sub-piping, and is equipped with an on-off valve. piping structure.