JP2006283733A - Gas-liquid mixture suction device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a gas-liquid mixture suction device capable of surly sucking a gas-liquid mixture or the gas containing a large quantity of water and moisture and the liquid containing gas or bubbles and usable in discharging the bubbles in a siphon pipe without problems. <P>SOLUTION: The gas-liquid mixture suction device 11 comprises a casing 12 in a sealed state, a pump 13 for discharging the liquid in the casing 12 to the outside of the casing, a suction path 14 for sucking the gas-liquid mixture into the casing 13, and an exhaust path 15 for discharging the gas in the casing 12 outside of the casing. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a gas-liquid mixture suction device, for example, a gas-liquid mixture suction device used for discharging air from a siphon pipe in a siphon-type water intake device.

A siphon-type water intake device is used as a device for supplying water from a pond or the like as irrigation water for paddy fields. In this siphon-type water intake device, since the inside of the siphon tube is in a depressurized state, the air dissolved in the water is separated into bubbles, and the siphon stops functioning when an air pool occurs at the highest point of the siphon tube. For this reason, bubble discharge means for discharging bubbles in the siphon tube is provided at the highest point of the siphon tube (see, for example, Patent Document 1).
JP 2001-45889 A

  However, depending on the conditions of the place where the siphon type water intake device is installed, there is a problem that the bubble discharging means does not operate normally or is tampered near the road. In addition, it is conceivable to connect a vacuum pump to the highest point of the siphon tube to forcibly discharge bubbles, but in general, the vacuum pump has a structure that sucks only gas, and sucks a gas containing a large amount of water and water vapor. In such a case, there is a problem that the durability is remarkably impaired and maintenance such as replacement of parts frequently occurs, and a water-sealed vacuum pump capable of sucking liquid needs to prepare fresh water for sealing water. have.

  Therefore, the present invention is capable of reliably sucking a gas-liquid mixture, that is, a gas containing a large amount of water or water vapor or a liquid containing bubbles, and can be used without any problem for discharging bubbles in the siphon tube. The object is to provide a mixture suction device.

  In order to achieve the above object, a gas-liquid mixture suction device of the present invention includes a sealed casing, a pump for discharging the liquid in the casing to the outside of the casing, a suction path for sucking the gas-liquid mixture into the casing, and the casing And an exhaust path for discharging the internal gas to the outside of the casing.

  According to the gas-liquid mixture suction device of the present invention, a negative pressure is generated in the casing by discharging the liquid in the casing with a pump, and this negative pressure causes gas, liquid, and gas-liquid mixture to enter the casing from the suction path. Inhale. Therefore, since the pump only sucks liquid, a general submersible pump can be used, and it is cheaper and easier to handle than a conventional vacuum pump.

  FIG. 1 is a schematic view of a gas-liquid mixture suction device showing one embodiment of the present invention, and FIG. 2 is an explanatory diagram showing an example in which the gas-liquid mixture suction device is applied to a siphon-type water intake device.

  The gas-liquid mixture suction device 11 includes a sealed casing 12, a pump 13 that discharges the liquid in the casing 12 to the outside of the casing, a suction path 14 that sucks the gas-liquid mixture into the casing 12, and a gas in the casing 12. And an exhaust passage 15 for discharging the gas to the outside of the casing.

  The casing 12 is formed in a structure that can withstand negative pressure inside, and an end portion of a pipe constituting the exhaust path 15 is connected to the top plate portion. The exhaust path 15 is preferably installed at a position where the entire amount of gas in the casing 12 can be discharged, and a check is made so that liquid and gas do not flow back into the casing 12 through the exhaust path 15. It is desirable to provide the valve 15a. However, the check valve 15a can be omitted by forming the exhaust passage 15 with a small through-hole or a small-diameter pipe, and a small through-hole that can be vented may be provided only in the top plate portion. .

  The pump 13 is a general electric submersible pump, which can be of a type that can reversely flow liquid when stopped. The suction port 13 a of the pump 13 opens near the bottom of the casing 12 and is formed so as to suck liquid from the bottom of the casing 12. The liquid sucked into the pump 13 is discharged from the discharge path 13b of the pump 13 to the outside of the casing. Normally, the wiring to the pump 13 is preferably sealed in the wiring penetrating portion, but there is no problem even if there is a slight gap, and the exhaust path 15 can be used.

  The position of the suction path 14 can be arbitrarily set unless it is in the vicinity of the suction port 13a. The suction path 14 is provided with a check valve 14a for preventing backflow. The suction path 14 may not penetrate the wall portion of the casing 12, and the check valve 14 a may be provided outside the casing 12. Depending on the state of the gas-liquid mixture, the check valve 14 a can be omitted, and an automatic valve that opens and closes in conjunction with the operation of the pump 13 can be used.

  The gas-liquid mixture suction device 11 thus formed is normally used in a state where the casing 12 is installed in the liquid. When the gas-liquid mixture suction device 11 is submerged in the liquid without the liquid in the casing 12, the pump 13 flows backward from the discharge path 13b through the suction port 13a due to the relationship between the buoyancy of the gas and the surrounding liquid pressure. As the external liquid flows into the casing 12, the check valve 15a of the exhaust path 15 opens and the gas in the casing 12 is discharged to the outside from the exhaust path 15, and finally the gas in the casing 12 is liquid. It becomes the state replaced with.

  When the pump 13 is operated in this state, the liquid in the casing 12 is sucked from the suction port 12a and discharged from the discharge path 12b, and the casing 12 is in a negative pressure state corresponding to the capacity of the pump 13. When the inside of the casing 12 becomes negative pressure, the check valve 14 a of the suction path 14 opens, and a fluid such as gas, liquid, and gas-liquid mixture is sucked into the casing 12 through the suction path 14. At this time, since the check valve 15a of the exhaust path 15 is closed, no gas or liquid flows into the casing 12 from the exhaust path 15.

  Even when the check valve 15 a is not provided in the exhaust path 15, the exhaust path 15 is a small through hole or a small-diameter pipe, and the reverse flow rate from the exhaust path 15 is sufficiently larger than the suction amount from the suction path 14. In the case where the amount of the fluid is small, the fluid can be sufficiently sucked from the suction passage 14 by operating the pump 13.

  The operation of the pump 13 can be continued until the liquid in the casing 12 runs out. When the pump 13 is stopped, the pump 13 flows backward to flow into the casing 12 as described above, and the gas in the casing 12 is discharged to the outside from the exhaust passage 15, and the gas in the casing 12 is replaced with the liquid. Is done.

  Thus, since the fluid is sucked into the casing 12 from the suction path 14 using the negative pressure generated by discharging the liquid in the casing 12 by the pump 13, the fluid can be any of gas, liquid, gas-liquid mixture. Even you can inhale. Moreover, since a general-purpose submersible pump can be used as the pump 13, the gas-liquid mixture suction apparatus 11 can be manufactured at low cost.

  When the gas-liquid mixture suction device 11 cannot be used with the casing 12 installed in the liquid, a storage tank having a larger internal volume than the casing 12 is connected to the discharge path 12b, and the pump 13 is operated. The liquid discharged from the casing 12 may be stored in the liquid storage tank, and the liquid in the liquid storage tank may flow back into the casing 12 when the pump 13 is stopped. In this case, however, it is necessary to store the liquid in the liquid storage tank only for the first time.

  Next, an example in which the gas-liquid mixture suction device 11 is applied to a siphon type water intake device will be described. The siphon-type water intake device is for taking water from the reservoir 21 and supplying it to the irrigation pipeline 22, and a siphon tube 24 having a relatively large diameter is disposed so as to straddle the dam body 23. On the pond side of the siphon tube 24, a flexible tube 26 connected to a suction port provided in the intake float 25 via a check valve and a water injection pump 27 for filling the siphon tube 24 in a full state are provided. The side of the pipeline 22 is connected to the pipeline 22 via a shutoff valve 28. Note that the siphon-type water intake device can adopt the same basic configuration except for the bubble discharging means in the conventional siphon-type water intake device, for example, the siphon-type water intake device described in Patent Document 1.

  An air reservoir 29 is provided at the highest point of the siphon tube 24 to lift the bubbles in the siphon tube 24 and remove them from the siphon tube 24. The air / liquid mixture suction device 11 is provided in the air reservoir 29. The suction path 14 is connected. The gas-liquid mixture suction device 11 is installed at the lower part of the float 31 and is formed so as to be always held at a predetermined position below the water surface even if the water surface of the reservoir 21 fluctuates. Further, the entire suction passage 14 or a part thereof is formed of a flexible tube for following the vertical movement of the gas-liquid mixture suction device 11. Further, the suction passage 14 is preferably connected to the uppermost part of the air reservoir 29 using a pipe having a relatively small diameter so that the air in the air reservoir 29 can be reliably sucked.

  In the siphon-type water intake device, when the siphon pipe 24 and the water intake float 25 are installed at predetermined positions, the water in the reservoir 21 flows from the suction port at the tip of the flexible pipe 26 to the reservoir side of the flexible pipe 26 and the siphon pipe 24 through the check valve. Inflow. At this time, the air in the siphon tube 24 is discharged from the gas-liquid mixture suction device 11 through the open shut-off valve 28 or through the air reservoir 29 and the suction path 14.

  Next, the shutoff valve 28 is closed, the water injection pump 27 is operated, and water injection from the water injection pump 27 into the siphon tube 24 is started. By this water injection, air in the siphon tube 24 is discharged to the outside from the gas-liquid mixture suction device 11 through the suction path 14, and the inside of the siphon tube 24 up to the shutoff valve 28 becomes full. On the flexible tube 26 side, water does not flow out from the suction port when the check valve is closed. The full water state in the siphon tube 24 can be confirmed by the fact that air is no longer discharged from the gas-liquid mixture suction device 11. In addition, the water from the siphon tube 24 flows into the casing 12 of the gas-liquid mixture suction device 11, and the water that has flowed back through the pump 13 is filled with water.

  When the water injection pump 27 is stopped and the shutoff valve 28 is opened after the siphon tube 24 is filled with water, the water in the reservoir 21 is supplied to the pipeline 22 by the siphon effect. In this state, the inside of the siphon tube 24 is decompressed, but the check valve 14a of the suction path 14 is closed, so that even if air remains in the casing 12, this air flows into the siphon tube 24. There is nothing.

  When water is supplied by the siphon type water intake device in this way, the air dissolved in the water becomes bubbles, and when passing through the highest point, it rises from the siphon tube 24 to the air reservoir 29 and is captured by the air reservoir 29. The In this state, the pump 13 of the gas-liquid mixture suction device 11 is operated to generate a negative pressure in the casing 12, whereby the air trapped in the air reservoir 29 passes from the air reservoir 29 through the suction path 14 into the casing 12. The air can be sucked and air can be reliably discharged from the siphon tube 24 and the air reservoir 29.

  In addition, after all the air in the air reservoir 29 has been sucked, the water that has flowed into the air reservoir 29 is sucked from the suction passage 14, but as described above, the gas-liquid mixture suction device 11 is a gas, liquid Any gas-liquid mixture can be inhaled, so there is no problem.

  The operation of the gas-liquid mixture suction device 11 attached to the siphon-type water intake device can be appropriately set according to various conditions. Usually, the operation may be performed only at a constant time interval, for example, a timer. By operating the gas-liquid mixture suction device 11 every few hours for a few seconds to several minutes, the air in the air reservoir 29 can be reliably discharged. Thereby, it is possible to prevent the siphon from functioning due to the accumulation of air in the siphon tube 24, and water supply by the siphon-type water intake device can be continued in a stable state over a long period of time.

It is the schematic of the gas-liquid mixture suction device which shows one example of this invention. It is explanatory drawing which shows the example which applied the gas-liquid mixture suction device to the siphon type water intake device.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 11 ... Gas-liquid mixture suction device, 12 ... Casing, 13 ... Pump, 13a ... Suction port, 13b ... Discharge route, 14 ... Suction route, 14a ... Check valve, 15 ... Exhaust route, 15a ... Check valve, 21 ... Reservoir, 22 ... Pipeline, 23 ... Dam body, 24 ... Siphon tube, 25 ... Water intake float, 26 ... Flexible tube, 27 ... Water injection pump, 28 ... Shut-off valve, 29 ... Air reservoir, 31 ... Float

Claims (1)

  A sealed casing, a pump for discharging the liquid in the casing to the outside of the casing, a suction path for sucking the gas-liquid mixture into the casing, and an exhaust path for discharging the gas in the casing to the outside of the casing are provided. A gas-liquid mixture suction device.

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