JPS60209700A - Venting of gas in siphon pipeline in siphon type liquid take-out device - Google Patents

Abstract

PURPOSE:To eliminate stagnation of gas in the siphon pipeline by a method wherein the gas in an enclosed type chamber is discharged to vent the gas and, thereafter, a valve, communicated with high-pressure liquid source, is closed, in the siphon type liquid take-out device. CONSTITUTION:The enclosed type chamber, equipped with a gas extracting valve 3, is connected to the upper part of the uppermost position 1b of the siphon pipeline 1 through normally opened first valve 6, the chamber is connected to the high-pressure liquid source 11 through normally closed second valve 8 and liquid is introduced into the chamber to discharge the gas. When a work for venting the gas in the chamber is finished, the first valve 6 is opened and the second valve 8 is closed. According to this method, the gas will never stagnate in the siphon pipeline and cause the trouble of flow of the liquid.

Description

Detailed Description of the Invention (Industrial Application Field) The present invention provides a siphon-type liquid extraction device that extracts liquid from a suitable water source such as a river, reservoir, or liquid tank through a series of siphon pipes by the siphon effect. The present invention relates to a method for degassing inside a siphon pipe.

(Prior Art) This type of siphon-type liquid extraction device is used, for example, when extracting agricultural water (irrigation water) from a water source such as a river or a reservoir. As an example of this siphon-type water intake device for taking out agricultural water, there is a conventional one shown in FIGS. 1 and 2. The siphon-type water intake device shown in FIGS. are connected by a series of siphon pipes 3/ installed bypassing a position higher than the liquid level Wα, and the highest part 31 of the siphon pipe V13/
A vacuum pump 33 for discharging the air inside the pipe w13/ is connected to b. And water source 10
When taking out the water W, the outlet 3 of the siphon pipe 3/
Vacuum pump 3 with valve 39 provided on the /c side closed.
3 is activated to discharge the air inside the pipe 3/ to the outside (at this time, the water W from the water source/Q side is sucked up and the pipe 3/ upstream from the valve 39 is filled with water. ), the vacuum pump 33 is stopped, and then the valve 39 is stopped in a timely manner.
By opening the water source 10, water W from the water source 10 can be continuously taken out from the outlet 3/c through the siphon pipe 3/ by the siphon effect.

By the way, in this type of siphon type water intake device,
The air dissolved in the water separates due to the drop in pressure, and the air thus separated comes to accumulate at the highest point 31b of the pipe 3/ as shown in FIG. This conduit 3
The air accumulated inside the chamber is discharged to the outside by operating the vacuum pump 33. In addition, in the conventional siphon type water intake device shown in FIGS. 1 and 2, the siphon effect in the pipe 31 is reduced at the highest part 31b (which becomes an air pocket) in the pipe 3/. A water level detection device 3t is provided which operates to detect when air has accumulated (for example, when the water level has fallen to a height indicated by symbol L') and operate the vacuum pump 33 based on the signal. When a predetermined amount of air accumulates in the pipe line 3/, the vacuum pump 33 is automatically activated. Note that by operating the vacuum pump 33, the pipe line 3/
When the air inside is almost completely exhausted (the water level reaches the mark H'
When the water level sensor fl13'/- is raised to a high position shown by , the water level detection device fl13'/- detects this and stops the operation of the vacuum pump 33 based on the signal. Therefore, in this conventional siphon type water intake device, when water is not being taken, the vacuum pump 33 is operated every time the water level in the highest portion 31b of the pipe drops to a predetermined low position L'.

As described above, in this conventional siphon-type water intake device, air is removed by operating the vacuum pump 33, but until the air is removed, the air remains in the oil stagnation inside the pipe 3/. As a result, the amount of air in pipe 3/ is within the permissible range of the predetermined amount of gust C even though the effect is not stopped.
If water is taken with the air present in the pipe 3/, there is a problem that the air in the pipe 3/ becomes an obstacle to the flow of liquid. ,
The critical amount of air rush to maintain the siphon pipe effect in the pipe 3/ is relatively small (for example, from the water level H' to the water level L' in FIG. 2), and the The critical amount of air will be generated in a relatively short period of time,
Therefore, there is a problem that the interval between starting and stopping of the vacuum pump 33 is shortened, and the life of the vacuum pump 33 is shortened.

In addition, with conventional siphon-type water intake devices that adopt this type of vacuum air extraction method, the pumping head cannot be very large (with conventional siphon-type liquid extraction devices for agricultural water intake, up to about 5 m), and the In a water source (with a high f lift), it is impossible to install the siphon pipe by bypassing the upper part of the shield, which makes the installation work of the siphon pipe difficult.

(Object of the Invention) In view of the problems of the conventional siphon-type liquid extraction device as described above, the present invention is capable of preventing gas from accumulating in a series of siphon pipes, which obstructs the flow, and also The object of the present invention is to propose a siphon-type liquid extraction device that can lengthen the interval between pump starts and stops and can also increase the pumping head.

(Structure of the device) The siphon-type liquid extraction device a of the present invention (a) allows liquid from an appropriate water source to be passed through a series of siphon pipes installed by bypassing a position higher than the liquid level, and is then caused to reach the liquid level by the siphon effect. In those designed to be taken out at a lower position,
A closed chamber with a gas venting valve is connected above the highest point of the siphon pipe through a normally open first valve, and the chamber is connected to a high pressure liquid through a normally closed second valve. When a predetermined amount of gas is collected in the chamber, the first valve is closed and the second valve is opened to introduce liquid from the high-pressure liquid source into the chamber to discharge the gas in the chamber. miJ&! The gas is discharged to the outside through a gas venting valve, and further, when the gas venting operation in the chamber is completed, the first valve is opened and the second valve is closed. .

(Example N) Figures 3 and 3 show an embodiment in which the present invention is applied to a siphon-type water intake device used for taking agricultural water from a water source such as a river or reservoir oil. First, before explaining the degassing method of this embodiment, the configuration of the illustrated siphon type water intake device will be explained. , is constructed in the same manner as the conventional siphon pipe shown in FIG. /C is the liquid level Wα outside the water source IO
It is installed so that it opens at a much lower position.

A manual valve 9 is provided near the liquid outlet/C of the siphon pipe 1.

A closed chamber 2 is connected via a connecting pipe S above the highest point /b in the siphon conduit /. The lower end of the connecting pipe S is opened to the earthen wall at the highest point of the pipe /, 6, and the upper end of the connecting pipe 5 is opened to the bottom of the chamber 2. By opening and closing the valve B provided in the connecting pipe S, the upper part of the highest part /b of the siphon pipe / and the bottom of the chamber 2 can be made to communicate with each other via the connecting pipe S, or can be cut off. It looks like this.

The valve B provided in the connecting pipe S is normally open, and in this embodiment, a solenoid valve that opens and closes in response to a signal from a water level detection device t, which will be described later, is employed. Furthermore, in order to distinguish this valve from the second valve which will be described later, this valve is called the first valve at the unknown l1lfI port.
It is called a valve.

A gas vent valve 3 is provided at the top of this closed chamber 2 for discharging gas (air in this embodiment) inside the chamber 2 to the outside. The waste removal valve 3 allows the gas in the chamber λ to be discharged to the outside, but acts to prevent outside air from entering the chamber λ. Although a check valve is used as the gas vent valve 3 in this embodiment, other gas vent valves such as electromagnetic valves may be used in other embodiments.

A high pressure liquid source // is connected to the chamber 2 via a second valve valve. In this embodiment, a water pump/2 is used as the high-pressure liquid source//, and the water pump/2 can forcibly supply water in the water source IO into the chamber through the water supply pipe/3. ing. The second valve is normally closed and is a tL valve similar to the first valve B, and is opened and closed by a signal from a water level detection device M'A, which will be described later.

This chamber 2 is provided with a water level detection device≠ for detecting the level of water flowing into the chamber 2.

This water level detection device t detects that the water level in the chamber 2 is 731r.
When the water level drops to a certain low water level (the position indicated by the symbol), the water level is detected and the signal is input to the controller/S. When the low water level signal is input, the controller/3 first closes the first valve 6, then opens the first valve, and then operates the front M6 water pump/2. or,
The water level detection device t detects that the water level in the chamber 2 is at a predetermined high water level C.
When the water level rises to the position marked H), the water level is detected and the signal is input to the controller/3. -・、ko2.
When the high water level signal is input, the sort roller/S first stops the operation of the water pump/2, closes the second valve g, and then opens the first valve O.

In the illustrated embodiment, a water pump/2 is used as the high-pressure liquid source//.
However, in other embodiments of the present invention, a gas evacuation liquid may be supplied to a position above the chamber 2 as a high-pressure liquid source.

Next, to explain the operation of this siphon-type liquid extraction device, first, in order to fill the siphon pipe with the liquid W from the water source 10, the valve provided on the liquid extraction port IC side of the siphon pipe should be opened at the IJ. controller/
Activate S. Then, the water level detection device a+ is in the chamber! The controller/S detects that there is no liquid at a predetermined lower position jfl (the position marked with the symbol) in the water tank, and based on that signal, the controller/S closes the first valve O, opens the second valve, and turns on the water pump/2. When activated, the liquid W from the water source 10 is supplied into the chamber 2 through the water supply pipe /3. The liquid supplied into chamber 2 temporarily becomes chamber! At that time, the air in chamber 2 is stored inside the chamber! When the water level in the water pump rises to the same level iPM (position marked with symbol ■), the water level detection device≠ detects this and uses that signal to stop the operation of the water pump/co, close the second valve valve, and valve 6 is opened to allow the liquid stored in chamber 2 to fall into the siphon line/side. At that time, the air in the siphon pipe passes through the connecting pipe S and enters the chamber! Flow into the side.

Then, the chamber 2 becomes empty and the water level detection device t detects it.
is detected, and the chamber is opened again as described above! Water supply to the interior will begin. Thereafter, such an action is automatically repeated to fill the siphon pipe/with the liquid W, and finally, the liquid is filled up to a predetermined high position C (sign H) in the chamber 2. And after that, it's chanba! The water level within the chamber 2 remains constant unless air flows into the chamber. In this state, the inside of the siphon pipe is filled with liquid, and when the valve 9 is opened, the liquid W in the water source 10 can be taken out from the liquid outlet /C through the series of siphon pipes due to the siphon effect.

In this siphon type liquid extraction device, when the pressure inside the siphon pipe decreases, the dissolved air in the water decreases by 10 minutes.In such a case, air flows into the chamber 2, and the water level in the chamber 2 gradually decreases. I come to do it. When the water level in the chamber 2 drops to a predetermined low position shown by the symbol, and the water level detection device a+ detects this, the controller/3 closes the first valve B and opens the second valve G. , further, the water pump 2 is controlled to be operated to supply liquid into the chamber 2, and when the water level in the chamber λ reaches a predetermined high position (the stillness of 11), the water level A signal from the detection device t stops the operation of the water pump/2, closes the second valve g, and opens the first valve 6 to allow communication between the siphon pipe l and the inside of the chamber 2.

As described above, in the method for degassing the siphon pipe in the siphon type liquid extraction device of this embodiment, the chamber 2
When the water level inside the chamber 2 drops to a predetermined low level, water supply to the chamber 2 is automatically started, so the inside of the siphon pipe can be maintained at a full liquid state at all times. This eliminates the problem of flow obstruction caused by separated air, which is the case with conventional siphon-type liquid extraction devices. Also, if the siphon type liquid extraction device of this embodiment is used,
Chamber! The capacity until the water level decreases from a predetermined high position (water level with code H) to a predetermined low position (water level with code f) can be increased, thereby increasing the interval between starting and stopping of water pump/2. You will be able to do this.

In addition, in this embodiment, when the chamber 2 is initially filled with water, the water level in the chamber 2 is at a predetermined low position (the position indicated by the symbol).
The chamber 2 is pumped by the water pump/2 when the water drops to
Since the liquid is forcibly supplied into the siphon pipe, the water pumping distance of the siphon pipe can be increased (e.g., up to about 10 m) compared to the conventional vacuum pump type. The siphon pipe can be installed even in a water source with high water content, and the siphon pipe can be installed by bypassing the upper part (surface layer) of the support. In addition, when installing a siphon pipe in a water source with a high sludge, if the water pumped by the sifon pipe is small, it must be buried in a relatively deep part of the sap, and the sifon pipe's Installation work becomes troublesome.

In addition, in the degassing method of this embodiment, the siphon pipe/
Each of the first valves provided between the chamber 2 and the water pump/2 and the second valve provided between the chamber 2 and the water pump/2 are each equipped with a solenoid valve, but in other embodiments, each is manually operated. It is also possible to use a valve. Further, the siphon type liquid extraction device of this embodiment is used for extracting irrigation trees from water sources such as rivers or reservoirs, but in other embodiments, this siphon type liquid extraction device can be used in a suitable liquid tank or oil tank. It can also be used when taking out the liquid inside the storage tank.

[Effects of the Invention] The method for degassing the siphon pipe in the siphon-type liquid extraction device of the present invention has the following effects.

11) A closed chamber 2 is connected above the highest height point /b in the series of siphon pipes / through a normally open first valve 6, and the chamber 2 is connected to a normally open second valve valve 6. Since a siphon-type liquid extraction device is used which is connected to a high-pressure liquid source l/ through The inside of the siphon pipe can always be kept full of liquid, and unlike conventional siphon-type liquid extraction devices, gas does not accumulate in the siphon pipe and cause flow obstructions. Since the limit amount of gas generation to maintain the siphon effect in is increased, it is possible to lengthen the operation Ht pump start/stop interval M) for degassing the chamber 2.

(,2) In order to vent the gas in the siphon pipe 1, a method is adopted in which the liquid W is introduced into the chamber 2 from the high-pressure liquid source 11, so when degassing is performed using a vacuum pump as in the conventional method, In comparison, the pumping head of the siphon pipe l can be increased, and for example, even in a water source with high sludge, the sifon pipe can be installed bypassing the upper part (surface layer) of the sludge. The installation work becomes easy.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram of a conventional siphon-type liquid extraction device, FIG. 2 is a partially enlarged view of the siphon-type liquid extraction device shown in FIG. 1, and FIG. A schematic diagram of a siphon-type liquid extraction device for carrying out the degassing method shown in Fig. 3.
It is a partially enlarged view. l・,・0. Siphon conduit/b,・6. Highest part of pipe 2°0...Chamber 3...Gas vent valve≠...6 Water level detection device a Otsu0000. 1st valve g...λth valve 10...Water source ii...High pressure liquid source 12...Water pump W...Liquid 11cc...Liquid level

Claims (1)

[Claims] /, liquid CW) of an appropriate water source (10), its liquid level fW
Φ) Through a series of siphon conduits (1) installed to bypass the heavier position, the siphon effect
In a siphon-type liquid extraction device configured to take out the liquid at a position below the plane (Wg), gas is supplied above the most Ia portion (/b) of the siphon pipe (/) through a normally open first valve tt>. With a removal valve 3)! ! Pl closed chamber (
2) and further connect the chamber (2) to the normally open second chamber (2).
When a predetermined amount of gas accumulates in the chamber (2), the first valve (B) is closed and the second valve ( f) is opened to allow liquid (W) from the sieve pressure source (/l) into the chamber 12), and the gas in the chamber (2) is removed from the gas vent valve (
3) to the outside through the chamber (2).
Gas in a siphon pipe line in a siphon type liquid extraction device, characterized in that when the gas removal work is completed, the first valve (B) is opened and the second valve (C) is closed. How to remove.