JPS63210500A - Water feeding device in aqueduct - Google Patents

Abstract

PURPOSE:To prevent the water hammer action in a water feed conduit after a water discharge quantity adjusting valve is closed by connecting a pressure tank to the tip of a branch main conduit provided in the middle of the water feed conduit and providing a flow velocity adjusting valve on a conduit bypassing the branch main conduit. CONSTITUTION:A branch main conduit 31 is extracted from the mid-section of a water feed conduit 12, and a pressure tank 32 is connected to the tip of this branch main conduit 31. A check valve 33 closed by the water flowing from the water feed conduit 12 to the pressure tank 32 is provided on the branch main conduit 31, a bypass conduit 34 is provided for this check valve 33, and a flow velocity adjusting valve 35 is provided on this bypass conduit 34. When a water discharge quantity adjusting valve 14 is closed, the water flowing in the water feed conduit 12 passes the bypass conduit 34 from the branch main conduit 31 and flees into the pressure tank 32. At that time, the abrupt inflow into the tank is prevented by the fluid resistance of the bypass conduit 34 and the flow velocity adjusting valve 35, thus the flow velocity in the water feed conduit 12 is slowly decreased. Accordingly, a water hammer is prevented from occurring.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Field of Industrial Application) The present invention relates to a water conveying device used, for example, when conveying water from a main waterway to a tributary waterway.

(Prior art) Conventionally, when pumping water from a main waterway to a tributary waterway in a remote area via a water supply pipe, a foot [1- A switch (a switch having a contact that turns on or off when a float that displaces with the water surface reaches a set level) is installed in the tributary waterway, and the float switch controls the pump drive motor to control water supply. In this method, the electrical wiring between the pump motor and the float switch is very long.

In addition, at the exit of the water supply pipe that opened into the tributary waterway, there was a
-There is a system that is equipped with a water discharge m adjustment valve (a type of 1-to-valve) as shown in Publication No. 14299, and this valve is controlled to open and close by a float to keep the water level of the tributary waterway constant. .

In this case, when the water discharge amount adjustment valve closes, the water pressure in the water pipeline increases, so the change in water pressure is detected by a pressure switch installed in the water pipeline, and the pump installed in the water pipeline stop.

When using such a water discharge fiawA regulating valve, water hammer is likely to occur due to the rapid opening and closing of the water discharge 1 regulating valve, and this water hammer may induce pipe damage or cause pipe resistance at the end of the pipe. This causes an imbalance in the amount of water supplied due to uneven water supply.
It's inconvenient.

The cause of the water hammer phenomenon is that the water discharge m adjustment valve at the outlet of the water supply pipe is suddenly closed, and the movement within the pipe (
By blocking the flow (flow), the pressure at the valve increases,
The kinetic energy it had is converted into the elastic energy of the water and the tube. However, other parts of the pipeline continue to flow in the same direction.

At this time, the part that caused the pressure on the back causes the movement of the part immediately next to it (
This is caused by the fact that large pressure waves are created to block the flow of water, and they propagate sequentially through the pipes with a certain period.

When this water hammer phenomenon occurs, there is a risk that the pipeline will burst.

To avoid this water hammer effect, either lengthen the closing time of the water stone regulating valve, or set the pipe so that the flow velocity in the pipe does not suddenly drop to zero even if the valve closes suddenly. All you have to do is provide a relief and slowly reduce the flow velocity in the pipe.

Prolonging the closing time of the water discharge [phase] regulating valve has a limit in terms of the operating characteristics of this valve, and is not a solution for stable water supply.

In addition, when the water discharge m regulating valve resumes discharging water after it has been closed, conventionally, it takes a considerable amount of time for the pump to start, the water to pass through the water supply pipe, and for the water discharge amount to reach the specified value. was spending.

(Problems to be Solved by the Invention) Conventionally, when a float switch for pump control is provided, the wiring required for the float switch is wasted, and when a water discharge amount adjustment valve is provided, the There were problems such as pipe breakage due to the occurrence of water hammer, and there was a technical limit to increasing the rim time of the water discharge adjustment valve to prevent water hammer, and furthermore, water supply by the pump had to be restarted. Time until the water reaches the end! There is a problem that requires m.

In order to solve these various problems, the present invention has the following features:
Focusing on the fact that water hammer can be prevented by slowly lowering the flow rate of the water supply pipe after the water discharge m adjustment valve is idle, we installed a pressure tank and a The purpose of this invention is to reliably and semi-permanently deal with the above problems at low cost by providing an organic combination of a stop valve and a bypass conduit having a flow rate regulating valve.

[Structure of the invention]

(Means for Solving the Problems) The present invention provides a water supply device for a waterway that supplies water from one waterway 11 through a water supply pipe 12 to a water discharge amount adjustment valve 14 provided in the other waterway 13. Said water pipe line 12
A branch main pipe 31 is drawn out from the middle of the branch pipe.
A pressure tank 32 is connected to the tip of the pipe line 31, and a check valve 33 that is closed by water flowing from the water supply pipe line 12 toward the pressure tank 32 is interposed in the branch main pipe line 31. 33, a bypass line 34 is provided in the branched main line 31, and a flow rate regulating valve 35 is provided in this bypass line 34.

(Function) In the present invention, when the water discharge amount adjustment valve 14 is closed, the water supply pipe 1
2 flows from the branch main pipe 31 to the bypass pipe 3.
4 and escapes into the pressure tank 32, but then the fluid resistance of the bypass line 34 and the flow rate adjustment valve 35 prevents the fluid from rapidly flowing into the tank.
The flow velocity in the water pipe 12 decreases slowly. This results in
Water hammer is prevented from occurring.

On the other hand, when the water discharge amount adjustment valve 14 is opened, the water accumulated inside the pressure tank 32 is pressurized and supplied to the water supply pipe line 12 by the tank internal pressure, and the time until full-scale water supply by the pump 24 is increased. The delay will be compensated.

(Examples) Hereinafter, the present invention will be described in detail with reference to examples shown in the drawings.

As shown in Figure 1, the main waterway 1 as one waterway
1 through the water supply pipe 12 to the discharge waterway 1 as the other waterway.
There is a water supply device that supplies water to the regulating valve 14 by discharging water provided in the control valve 14 .

A strainer 21 is installed on the water supply low source side of the water supply pipe 12.
, check valve 22, valve 23, water pump 24, check valve 25, and valve 26 are provided in this order, and water can flow in this order.

Further, a branch main pipe 31 is drawn out from the middle of the water supply pipe 12, and a pressure tank 32 is installed at the tip of the branch main pipe 31.
is connected. This pressure tank 32 has the functions of a surge tank, an accumulator, and a pressure detection container. A check valve 33 that is closed by water flowing from the water supply pipe 12 toward the pressure tank 32 is interposed in the branch main pipe 31, and a bypass is provided to the branch pipe 31 for this reverse 1 valve 33. A pipe line 34 is provided, and a flow rate regulating valve (variable throttle valve) 35 is provided in this bypass pipe line 34. The branch main pipe 31 is made up of a thick pipe and has low pipe resistance, whereas the bypass pipe 34 is made of a thin pipe, and this bypass pipe itself serves as a fixed throttle resistance.

A pressure gauge 36 that displays the tank internal pressure and a pressure switch 37 that is activated by the tank internal pressure are provided at a portion where the branch main pipe 31 is connected to the pressure tank 32. This pressure switch 37 is turned off when the tank internal pressure rises to a certain set pressure, stopping the electric motor for driving the water pump and water supply by the pump 24, and when the tank internal pressure falls to a certain setting pressure. When it is turned on, the electric motor for driving the water pump is operated, and the pump 24 starts feeding water.

Air is sealed in the upper part of the pressure tank 32,
As the water level 38 inside the tank increases, this internal air is compressed and the water pressure inside the tank also increases.

Further, a drain valve 39 is provided at the bottom of the tank 32.

Next, the water discharge amount adjustment valve 14 will be explained.
As shown in the figure, a support member 41 is attached to the upper part of the waterway 13.
A shaft guide part 42 is provided through the shaft guide part 42, and a vertical shaft 43 is fitted into this shaft guide part 42 so as to be able to move up and down, and a float engagement part for high water use is provided at certain parts of the upper and lower parts of this vertical shaft 43. 44 and a float engaging portion 45 for low water level are each integrally provided, and a float 46 that is vertically movable is fitted to the vertical shaft 43 between the upper and lower engaging portions 44 and 45.

As shown in FIG. 2, a link mechanism 52 is provided between the vertical shaft 43 and the valve body 51 of the water discharge amount adjustment valve 14, and this link mechanism 52 allows the vertical shaft 43 to move up and down while remaining vertical. be moved. The upper lever 53, which constitutes a part of the link mechanism 52, is rotatably supported in the center at a substantially fixed position.
The upper part of 4 is pivoted.

An operating shaft 55 is connected to the lower part of the vertically movable frame 54, and an auxiliary valve body 56 and a locking portion 57 are integrally fitted to the upper part of the operating shaft 55.

As shown in Japanese Utility Model Publication No. 59-31978, this water discharge m adjustment valve 14 has an upper valve body holding portion 61 and a lower main valve seat 62 inside the valve body 51 for water inflow. The valve body 64 is integrally provided through an opening 63, and a main valve body 64 is fitted inside the valve body holding portion 61 so as to be vertically movable. The main valve body 64 and the like are formed in a cylindrical shape. A shaft guide portion 65 is integrally provided inside the main valve body 64.
The operating shaft 55 is fitted into this shaft guide portion 65 so as to be vertically movable within a small range. A sub-valve seat 66 that is opened and closed by the sub-valve body 56 is provided on the upper part of the shaft guide portion 65;
Water accumulated on the upper side of the main valve body 64 passes through this sub-valve seat 66 and the water handling hole 61 below it, hits between the main valve bodies, and is discharged to the drain port 68 on the lower side of the main valve seat 62 . This drain port 68 is open to the inside of the water discharge channel 13, and a pipe connecting portion 69 connected to the water supply pipe 12 is connected to the drain port 68 through the water inflow opening 63 and the opening of the valve seat 62. Communicate.

Then, as shown in FIG. 1, when the water surface 71 in the spillway 13 falls, the float 46 also falls, and when the float 46 falls to a certain low water level 72, the float 46 hits the engaging part 45, Push down the vertical shaft 43. This movement is reversed by the lever 53, and the vertical movement frame 54 and operating shaft 55 are moved upward. By this movement, first the sub valve body 56
opens, and the water that had previously risen through the loose fitting gap between the valve body holding portion 61 and the main valve body 64 and filled the space above the main valve body 64 passes through the water drain hole 67 and the like. Water is drained to a drain port 68. Therefore, since there is nothing above the main valve body 64 that obstructs the upper limit of the main valve body 64, the operating shaft 55
The main valve body 64 is pushed up by the locking portion 57 that rises at the same time, and the main valve seat 62 opens. The water supplied to the pipe connection portion 69C passes through the opening of the main valve seat 62 and flows out from the drain port 68 into the discharge channel 13. As a result, the water level in the waterway 13 returns to its upper back.

Further, when the water level of the water surface 71 of the waterway 13 rises, the float 4G also rises, and when the float 46 rises to a certain high water level 73, the float 46 comes into contact with the upper float engaging portion 44. , pushes up the vertical shaft 43. This movement is reversed by said lever 53;
As the vertically movable frame 54 descends, the operating shaft 55 also descends. As a result, the auxiliary valve body 56 closes the auxiliary valve seat 66 and pushes downward, which causes the main valve body 64 to descend and close the main valve seat 62, stopping water discharge into the waterway 13. .

Next, the operation of the water supply circuit shown in FIG. 1 will be explained.

During regular water supply, water is sucked from the strainer 21 through the check valve 22, the pressure is increased by the water pump 24, the water passes through the check valve 25, and is discharged into the discharge channel 13 from the water discharge amount adjustment valve 14. At the same time, since water is fed to the pressure tank 32 from the flow rate regulating valve 35, the internal pressure of the pressure tank 32 is equal to the discharge pressure of the water pump 24.

Then, the water discharge amount adjustment valve 14 performs water discharge υ control (water level control), and when the water surface 71 in the water discharge channel 13 rises and exceeds the high water level 73, the a1 of the water discharge amount adjustment valve 14 as described above.
The valve body 56 and the main valve body 64 rapidly open and close, and the water supply pipe 12
As the pressure increases, the water in the water supply pipe 12 is discharged from the main branch pipe 31 through the flow rate regulating valve 35 of the bypass pipe 34 and into the pressure tank 32. This avoids sudden changes in the pressure and flow rate of the water pumped from the pump 24, and also because the check valve 25 is slowly opened, the water hammer effect in the water supply pipe 12 is avoided.

The internal pressure of the pressure tank 32 and the L rising time are controlled by the flow rate regulating valve 35, and when the tank internal pressure rises to a certain set value, the pressure switch 37 detects this and stops the water pump 24. Therefore, the time difference from when the water discharge amount adjustment valve 14 is closed until the water supply pump 24 is stopped can be freely selected by the flow rate adjustment valve 35. If this flow rate adjustment valve 35 is not installed, there is a risk of damage to the pump motor due to hunting during starting and stopping of the water pump 24, and furthermore, the pressure tank 32 needs to be a Hitoyoshi type. is solved by this flow rate regulating valve 35.

Furthermore, when the water discharge 1!1ly4 regulating valve 14 starts discharging water, the water pressure in the water supply pipe 12 decreases, so the high pressure water accumulated in the pressure tank 32 (for example, the pump discharge pressure
← about 2 K9/ci) immediately pushes open the check valve 33 of the branch main pipe 31 with low pipe resistance, and the water supply pipe 1
2 and is supplied to the water discharge fiSwA regulating valve 14, and then the pressure switch 31 detects a decrease in the tank internal pressure and starts the water pump 24. Therefore, water is sprayed quickly and continuously.

[Efficacy of invention Song Dynasty]

According to the present invention, a branch main pipe is drawn out from an intermediate part of the water supply pipe, a pressure tank is connected to the tip of the branch main pipe, and water flows from the water supply pipe toward the pressure tank in the branch main pipe. A backflow valve that is closed by water is interposed, a bypass pipe is provided in the branch main pipe for this reverse valve, and a flow rate adjustment valve is provided in this bypass pipe, so that the water discharge amount adjustment valve is After the water discharge rate adjustment valve closes, the sudden pressure increase in the water supply pipeline is gradually absorbed by the pressure tank through the bypass pipeline having the flow rate adjustment valve, and the flow rate in the water supply pipeline is adjusted after the water discharge rate adjustment valve is closed. By lowering the water slowly, water hammer can be avoided in the water pipes and damage to the pipes can be prevented. In addition, since a check valve is provided in the branch main pipe, this reverse 1
Through the valve, the water stored in the pressure tank can be immediately supplied into the water supply pipe, and water can be quickly resumed. In addition, by organically combining a pressure tank, a check valve, and a bypass pipeline with a flow rate adjustment valve for the branch main pipeline drawn out from the water supply pipeline, a water discharge amount adjustment valve can be provided. Since there is no need to install an electrical switch such as a float switch that is prone to failure in the water channel, and there is no need for long wiring, it is possible to reliably deal with the damage caused by previous water distribution and rapid water discharge with durability and at low cost.

[Brief explanation of the drawing]

FIG. 1 is a fluid port diagram of a water conveying device in a waterway according to the present invention;
FIG. 2 is a sectional view of the water discharge amount regulating valve. 11. Main waterway as one waterway, 12. Water supply pipe, 13. Discharge channel as the other waterway, 14. Water tank adjustment valve, 24. Water pump, 31. Branch main pipe. 3
2...Pressure tank, 33...Check valve, 34...Bypass pipe line, 35...Flow rate adjustment valve.

Claims (3)

[Claims] (1) In a water supply device for a waterway that supplies water from one waterway through a water supply pipe to a water discharge adjustment valve provided in the other waterway, a branch main pipe is drawn out from an intermediate part of the water supply pipe, A pressure tank is connected to the tip of this branch main pipe, and a check valve that is closed by water flowing from the water supply pipe toward the pressure tank is interposed in the branch main pipe. A water supply device for a waterway, characterized in that a bypass pipe is provided in the branch main pipe, and a flow rate regulating valve is provided in the bypass pipe. (2) Water is pumped from one waterway at a lower level to a water discharge adjustment valve installed in the other waterway at a higher level by the action of a water pump controlled by a pressure switch that detects the internal pressure in the pressure tank. A water conveying device in a waterway according to claim 1, which supplies water. (3) The water supply device in a waterway according to claim 1, wherein the water discharge amount adjusting valve is opened and closed by a cylindrical main valve body.