JP2500124B2 - Flow direction control device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control device which is installed in a pipe for drinking water or the like to keep the flow in a branch pipe in a constant direction regardless of the flow direction of the main pipe.

[0002]

2. Description of the Related Art In the case where some kind of equipment is provided in the middle of a pipeline for a fluid such as water or gas, it may be inconvenient if the flow direction of the fluid in the equipment such as a filter or a chemical injection device is not constant. However, these pipes are networked in recent years, and the flow direction is often not constant depending on the portion of the pipes. Therefore, conventionally, when installing equipment that requires a constant flow direction in the middle of such a pipeline, it has been common to construct a circuit having such a function by combining check valves. FIG. 2 shows an example of the underground underground drinking water tank, and FIG. 3 is a circuit diagram thereof.

Two branch pipes 2 and 2 are provided between the water mains 1 and a facility 6 (a tank in this case) installed midway. The water that enters the tank passes through a processing device 61 such as a pressure reducing valve, or water is circulated in a certain direction in the tank to maintain freshness.
It is required to flow in from the other side and flow out from the other outflow pipe 22. By the way, the water flow in the main pipe changes in the A direction indicated by the solid arrow and the B direction indicated by the dotted arrow due to the supply and demand relationship at that time, and is not constant. Therefore, two bypass pipes 3 and 3'are provided between the two branch pipes, and four check valves (the flow direction is shown by an arrow in FIG. 3) are provided as shown in the figure. As a result,
Water always enters the tank from 21 and flows out from 22 at the tip of the branch pipe regardless of the direction of flow of the main pipe. There is a sluice valve 5 between the outlets of the two branch pipes of the main pipe 1, which is normally closed so that all the water passing through the main pipe passes through the tank.

[0004]

By the way, although the circuit described above has a sufficient function, not only does it require a large number of valves and pipes, but also requires a great deal of cost and space for installation.
As a result of the increase in the number of connection points of the pipes, it has also been a cause of leakage from these to the inside and outside of the pipes. SUMMARY OF THE INVENTION It is an object of the present invention to solve these problems and realize a compact flow direction control device that does not cause leakage.

[0005]

To this end, the present invention provides two main pipes near a facility for installing a facility for passing a fluid in the middle of a pipeline for transporting the fluid. Outlet pipes are installed at both ends of the branched inflow pipe at equal intervals, and a partition is provided in the center of the cylinder with an outer diameter slightly smaller than the inner diameter of the main pipe, in which the three branch pipes are attached. Insert a slidable cylinder into the cylindrical surface on both sides at the same interval as the branch pipe, and slide the slender cylinder into a predetermined position inside the main pipe so that the cylinder will stop at a position facing the opening and the branch pipe mounting part. It is configured by providing a stopper on.

[0006]

[Operation] According to the above configuration, the cylindrical body slides in the main pipe due to the dynamic pressure of the fluid in the main pipe, and the side where the fluid of the main pipe always flows and the outflow pipe of the branch pipe pass through the same. Since the inflow pipe communicates with the opposite side of the main pipe, the flow in the branch pipe can be always maintained in a constant direction regardless of the flow direction of the main pipe.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIG.
Three branch pipes, which are attached at equal distances from the main pipe 1, are connected to a facility such as a tank (not shown). The middle is an outlet pipe 21 from the main pipe to the equipment, and the both ends are inflow pipes 22 and 22 'from the equipment to the main pipe. These two pipes are originally one, but for the necessity of the present invention, they are branched near the main pipe. It is a thing. The cylindrical body 7 is inserted into the main pipe of this portion. The cylindrical body 7 has a partition 72 provided at the center of a cylinder 71 having an outer diameter slightly smaller than the inner diameter of the main pipe. Both ends are opened, and the partition 72 is sandwiched between the openings 73 at intervals d on the cylindrical surfaces on both sides. 73 'is open. The cylindrical body 7 can freely slide left and right in the main pipe 1 until it hits stoppers 8 and 8'provided at both ends. FIG.
In (a), if the fluid in the main pipe flows from left to right in the figure, the fluid pushes the cylindrical body 7 to the right due to its dynamic pressure, and the cylindrical body 7 is stopped at the position shown in this figure by the stopper 8 '. . At this time, the openings 73, 73 'are just branch pipes 21, 22'.
The fluid from the left side of the main pipe flows from the opening 73 on the left side to the outflow pipe 21, and the fluid from the facility returns to the main pipe from the inflow pipe 22 'on the right side and flows rightward. The left inflow pipe 22 is closed because there is no opening in the inner cylindrical body 7, and does not function in this state.

Next, when the fluid in the main pipe flows from right to left as shown in FIG. 1 (b), the cylindrical body 7 moves to the left by the dynamic pressure of the fluid until it hits the stopper 8, and the openings 73, 73 'are formed. Since it comes to the position opposite to the branch pipes 22 and 21, the fluid from the main pipe flows from the opening 73 'on the right side to the outflow pipe 21, and the fluid from the facility returns to the main pipe from the inflow pipe 22' on the left side. The material of the cylindrical body 7 is not particularly limited, but it is necessary that the cylindrical body 7 is lubricated by the fluid of the main pipe itself and does not affect the water quality in the case of drinking water pipes, for example, a fluorine resin is preferable.

In FIG. 1, the outflow pipe 21 is installed above the main pipe and the inflow pipe 22 is installed below the main pipe in opposite directions, but this is for convenience of construction. As for the constitution of the invention, there is no problem even if these are in the same direction.

[0010]

According to the present invention, the flow direction is automatically switched by the dynamic pressure of the fluid itself just by inserting the cylindrical body into the main pipe of the branch pipe mounting portion, and the inside of the branch pipe is irrespective of the flow direction of the main pipe. Can always maintain the flow in a fixed direction, which not only saves the installation cost and location, but also has the great effect of reducing leakage inside and outside the pipe.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention.

FIG. 2 is a sketch showing a conventional technique.

FIG. 3 is a piping diagram of FIG. 2 showing a conventional technique.

[Explanation of symbols]

 1 main pipe 2 branch pipe 21 outflow pipe 22 inflow pipe 3 bypass pipe 4 check valve 5 gate valve 6 tank 7 cylindrical body 73, 73 'opening 8, 8'stopper

Claims (1)

(57) [Claims] 1. When a facility or the like for passing a fluid is installed in the middle of a pipeline for transporting a fluid, a main pipe near the facility is provided with an inflow pipe branched into two ends and an outflow pipe in the center thereof. Are installed at equal intervals, and a partition is provided in the center of the cylinder with an outer diameter slightly smaller than the inner diameter of the main pipe in the main pipe to which these three branch pipes are attached. The flow direction control is characterized in that a cylindrical body having an opening is slidably inserted and a stopper is provided at a predetermined position in the main pipe so that the cylindrical body stops at a position facing the opening and the branch pipe mounting portion. apparatus.