JP2007138865A - Pump device, and waste water septic tank provided with the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a low cost pump device of a simple structure capable of stably supplying low flow rate liquid, and a waste water septic tank provided with the same. <P>SOLUTION: This pump device is provided with a first vessel storing liquid and a second vessel stored in the first vessel with dipped in the liquid. The second vessel includes a flow-in port taking liquid in the first vessel into the second vessel, a discharge pipe discharging liquid in the second vessel to an outside of the first vessel, and a gas flow-in pipe pressurizing liquid in the second vessel and pushing out the same to the discharge pipe. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a pump device for supplying a small flow rate liquid using gas and a sewage septic tank provided with the same.

Various pumps such as an air lift pump and an intermittent metering pump have been proposed as a pump for supplying a liquid using a gas.
An example of the air lift pump will be described with reference to FIG. 5. The air lift pump is usually composed of a pumping pipe 61 and an air supply pipe 62. The principle of this pump will be explained. First, when air is sent from the air supply pipe 62 into the pumping pipe 61, the water and air in the pipe are mixed, and the specific gravity of the water in the pipe becomes light. If it does so, the water in the pumping pipe 61 will be continuously pushed up by the water pressure in a water tank, As a result, the water in a water tank can be pumped and transferred.

On the other hand, an intermittent metering pump as shown in FIG. 6 has been proposed. This intermittent metering pump is provided with a sealed container 73 having an intake port 71 and a pumping pipe 72 for taking in a liquid, and an air supply pipe 74 for sending pressurized air into the sealed container 73.
Next, the principle of this pump will be described. First, before sending air, the sealed container 73 is filled with water. When air is sent here through the air supply pipe 74, the water in the sealed container 73 is pushed upward from the pumping pipe 72 by this air pressure, and the water is transferred.
When the water in the sealed container 73 decreases and the water level in the container becomes lower than the lower end 75 of the pumping pipe 72, the air sent from the air supply pipe 74 escapes from the pumping pipe 72 and the pressure in the sealed container 73 decreases, At the same time, water flows into the sealed container 73 from the intake port 71.
After that, when the water level in the sealed container 73 becomes higher than the lower end portion 75 of the pumping pipe 72 and the air pressure of the air supply pipe 74 becomes larger than the water pressure from the intake port 71, the on-off valve 76 provided in the intake port 71 is opened. After closing, the water in the sealed container 73 is pushed out from the pumping pipe 72 by air pressure again. By repeating this, the water in the sealed container 73 is discharged from the pumping pipe 72. (See Patent Document 1)
JP 2003-227499 A

However, these pumps are usually used at a flow rate of several liters or more per minute. For example, when supplying a small amount of liquid whose flow rate per minute is several to several tens of ml. In addition to the complicated structure, it was difficult to supply a stable flow rate.
On the other hand, as means for supplying a liquid with a small flow rate, there is an electric pump such as an electromagnetic type. However, these pumps are expensive in the field of small-scale septic tanks and difficult to actually use.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide an inexpensive pump device that can stably supply a small flow rate of liquid with a simple structure and a sewage septic tank equipped with the pump device.

In order to achieve the above object, the present invention has the following configuration.
(1) The present invention includes a first container that contains a liquid, and a second container that is housed so as to be immersed in the liquid in the first container. An inlet for taking the liquid in the first container into the second container, a discharge pipe for discharging the liquid in the second container out of the first container, and pressurizing the liquid in the second container It is a pump device having a gas inflow pipe that pushes out to a discharge pipe.
(2) The pump device according to item (1), wherein the cross-sectional area of the inflow port is less than the cross-sectional area in the axial direction of the discharge pipe.
(3) The pump device according to item (1) or (2), wherein the inflow port is provided on the bottom surface of the second container.
(4) The pump device according to any one of items (1) to (3), wherein an axial cross-sectional area of the discharge pipe is equal to or less than a cross-sectional area of a surface on which the discharge pipe of the second container is installed.
(5) The pump device described in any one of (1) to (4) is configured such that the liquid in the third container is transferred into the first container by the air lift pump in the third container having the air lift pump. The pump device is arranged so as to be supplied to and overflowed, and the overflowed liquid is again accommodated in the third container.
(6) The pump device according to item (5), wherein the gas supplied to the air lift pump is a part of the gas sent to the gas inlet pipe of the second container.
(7) A sewage septic tank provided with the pump device according to any one of items (1) to (6).

According to the pump device of the present invention, a small flow rate of liquid can be supplied with a simple structure.
Moreover, according to the sewage septic tank provided with the pump device of the present invention, a low flow rate liquid can be supplied with an inexpensive and simple device without using an expensive device such as an electric pump.

First, the operation principle of the pump device of the present invention will be described with reference to FIG.
FIG. 1 is a schematic cross-sectional view showing an embodiment of the pump device of the present invention, where (a) is a state before supplying gas, (b) is a state when supplying gas (first few seconds), (c ) Is a state at the time of gas supply (after the liquid is discharged from the second container 2), and (d) is a state several seconds after the supply of gas is stopped.
In the state (a) before supplying the gas, the liquid of the same water level as the water level of the first container 1 is accommodated in the second container 2 of the pump device. Here, when gas is introduced from the gas inflow pipe 5, the liquid in the second container 2 is pushed out by the increase in pressure in the container, and the liquid is discharged from the discharge pipe 4, and a part of the inlet 3 is discharged (state b). Next, after the liquid in the second container 2 is discharged, the gas remains discharged from the inlet 3 and the discharge pipe 4 (state c). At this time, since the pressure in the second container 2 is set to be higher than the water pressure applied to the inlet 3, the liquid in the first container 1 is supplied from the inlet 3 while the gas is supplied. Never flows in. Next, when the supply of gas is stopped, the liquid in the first container 1 flows into the second container 2 from the inlet 3 (state d), and returns to the state (a) before the gas supply. By repeating this cycle, a constant volume of liquid can be supplied.

  The amount of liquid supplied per cycle can be arbitrarily adjusted by the volume of the second container 2, the position of the inlet 3, the cross-sectional area, and the like. Further, the liquid supply amount per unit time can be arbitrarily adjusted by setting the interval between gas supply and stop. In addition, since the pump device also cleans the inlet 3 when supplying gas into the second container 2, it is possible to prevent clogging of foreign matters at the inlet 3 and ensure a stable liquid flow rate. .

Next, with reference to FIG. 1, the structure of an example of the pump apparatus of this invention is demonstrated.
The pump device includes a first container 1 that stores liquid and a second container 2 that is stored so as to be immersed in the liquid in the first container 1. In the second container 2, the inlet 3 for taking the liquid in the first container 1 into the second container 2 and the liquid in the second container 2 are discharged out of the first container 1. It has a discharge pipe 4 and a gas inflow pipe 5 that pressurizes the liquid in the second container 2 and pushes it out to the discharge pipe 4.

  The shape of the first container 1 is not particularly limited as long as it has a volume and a shape that can accommodate the second container 2 and a necessary amount of liquid. Moreover, although it does not specifically limit about a material, It is preferable that it is a material which has durability with respect to the liquid accommodated in the 1st container 1. FIG.

  The shape of the 2nd container 2 is not specifically limited, It can be made into arbitrary shapes as needed. Further, regarding the material, it is preferable that the material has durability against the liquid to be stored in the same manner as the first container 1. The volume of the second container 2 can be arbitrarily set according to the amount of liquid to be supplied. For example, when the volume of the second container 2 is approximately 15 mL to 30 mL, the liquid supply amount per cycle can be set to about 10 mL.

The cross-sectional shape of the inflow port 3 can be various shapes such as a circular shape, an elliptical shape, a polygonal shape, a slit shape, and a mesh shape, but is preferably a circular shape.
The cross-sectional area of the inlet 3 is preferably smaller than the cross-sectional area of the discharge pipe 4 in the axial direction. When the cross-sectional area of the inflow port 3 is larger than the cross-sectional area of the discharge pipe 4 in the axial direction, when the gas is supplied from the gas inflow pipe 5, the liquid in the second container 2 can easily escape from the inflow port 3. This is because it becomes difficult to discharge the liquid from the discharge pipe 4.
However, if the cross-sectional area of the inlet 3 is too small, clogging is likely to occur at the inlet 3 when foreign matter is present in the liquid. Therefore, the cross-sectional area of the inflow port 3 is preferably about 0.5 mm ² or more, more preferably 3 mm ² or more, and preferably less than the cross-sectional area in the axial direction of the discharge pipe 4.

  The inlet 3 can be installed anywhere as long as it is lower than the liquid level in the first container 1, but is preferably lower than the position where the discharge pipe 4 is attached, more preferably This is the bottom surface of the second container 2. When the inlet 3 is provided at a position lower than the position where the discharge pipe 4 is attached, the water pressure applied to the inlet 3 becomes larger than the water pressure applied to the discharge pipe 4 (the cross-sectional area in the axial direction of the inlet 3 and the discharge pipe 4 is larger). If the same). As a result, when the gas is supplied, the liquid in the second container 2 is more easily discharged to the discharge pipe 4 than the inflow port 3.

For example, as shown in FIG. 1, if the inlet 3 is provided on the wall surface opposite to the discharge pipe 4, the liquid in the second container 2 is easily discharged from the discharge pipe 4. The amount can be increased. In addition, as shown in FIG. 2, if the inlet 3 is provided on the same wall surface as the discharge pipe 4, the amount of liquid that escapes from the inlet 3 increases, so the amount of liquid discharged from the discharge pipe 4 is reduced. it can. In this manner, the amount of liquid discharged from the discharge pipe 4 can be adjusted by the installation position of the inflow port 3.
A similar function can be provided by providing an opening / closing valve that closes when the second container 2 is in a pressurized state and opens when the second container 2 is not pressurized instead of the inflow port 3.

The discharge pipe 4 is for discharging the liquid in the second container 2 to a location where the liquid is desired to be supplied, and is provided at a position lower than the liquid level of the second container 2.
The cross-sectional area in the axial direction of the discharge pipe 4 is preferably equal to or less than the cross-sectional area of the surface of the second container 2 where the discharge pipe 4 is provided. When the cross-sectional area of the discharge pipe 4 in the axial direction is larger than the cross-sectional area of the surface of the second container 2 where the discharge pipe 4 is provided, the liquid is discharged in the discharge pipe 4 when the liquid in the second container 2 is discharged. This is because the liquid supply amount becomes unstable as a result.
In the embodiment shown in FIGS. 1 and 2, only one discharge pipe 4 is provided. However, the present invention is not limited to this, and a plurality of discharge pipes 4 are provided as necessary to provide liquid at a plurality of locations. Can also be supplied.

The gas inflow pipe 5 is for introducing gas into the second container 2 in order to pressurize and discharge the liquid in the second container 2. The inlet 6 of the gas inflow pipe 5 is connected to a blower that sends air.
The cross-sectional shape, material, tube diameter, and the like of the gas inflow tube 5 can be arbitrarily set as necessary. The installation position of the gas inflow pipe 5 is not particularly limited, but it is preferably installed on the upper surface or the side surface of the second container 2 in consideration of installation properties.

The flow rate of the gas supplied to the gas inlet pipe 5 pushes out the liquid stored in the second container 2 and can secure a pressure equal to or higher than the water pressure applied to the inflow port 3 while supplying the gas (flow). The flow rate is preferably equal to or higher than the flow rate (which can prevent liquid from flowing in from the inlet 3). The specific preferable range varies depending on the specifications of the second container 2, the inlet 3 and the discharge pipe 4, but for example, the volume of the second container 2 is 15 mL, the cross-sectional area of the inlet 3 is 8 mm ² , and the discharge pipe. In the case of an inner diameter of 4 mm, the preferred range of the gas flow rate is 5 to 100 L / min, more preferably 10 to 50 L / min.

  Gas supply to the gas inflow pipe 5 is normally performed by timer control, and the ON-OFF time can be arbitrarily set according to the amount of liquid to be supplied per unit time. For example, when it is desired to increase the amount of liquid supply per time, the ON-OFF switching frequency may be set to a large value. When it is desired to decrease the liquid supply amount, the ON-OFF switching frequency may be decreased.

Next, another embodiment of the pump device of the present invention will be described with reference to FIG.
FIG. 3 is a schematic cross-sectional view of another embodiment of the pump device. The pump device has a third container 8 having an air lift pump 7 and the first container 1 and the second container 2 described above. And a pump device unit 80 having the above structure.

  The shape of the 3rd container 8 will not be specifically limited if the air lift pump 7 can be accommodated and the water depth which can pump up with the air lift pump 7 can be ensured, It can be set as arbitrary shapes. Further, the material is preferably a material having durability against the liquid stored in the third container 8.

The air lift pump 7 is not particularly limited as long as it can pump the liquid in the third container 8. For example, in FIG. 3, an outer pipe method in which the air introduction pipe 7a of the air lift pump 7 is connected to the outer surface of the pumping pipe 7b is used, but an inner pipe system in which the gas introduction pipe 7a is provided inside the pumping pipe 7b is used. May be.
In this embodiment, an air lift type pump is used. However, the present invention is not limited to this, and an intermittent quantitative pump or an electric pump can also be used.

  The flow rate of the liquid supplied from the air lift pump 7 is preferably larger than the amount of liquid discharged from the second container 2 in the pump device unit 80. Then, even after the liquid is discharged from the second container 2, the water level in the first container 1 and the liquid storage amount in the second container 2 can be kept constant. As a result, it becomes difficult to be affected by the remaining amount of the liquid stored in the third container 8, and a constant liquid amount can always be discharged.

  The flow rate of the gas supplied to the air introduction pipe 7a should just be more than the flow volume which can pump up the liquid in the 3rd container 8. FIG. Further, the gas supplied to the air introduction pipe 7a may be a part of the gas sent to the gas inflow pipe 5 of the second container 2 as long as the above flow rate is ensured. In this case, in order to adjust the air amount, an air amount adjusting member such as an orifice or a valve can be provided in one or both of the gas introduction pipe 7a and the gas inflow pipe 5. (Not shown)

  Since the pump device unit 80 is as described above, a detailed description thereof is omitted here. The pump device unit 80 shown in FIG. 3 is installed so as to be accommodated in the third container 8, but the liquid in the third container 8 is brought into the first container 1 by the air lift pump 7. As long as the liquid can be supplied and the liquid overflowing from the first container 1 is accommodated in the third container 8 again, the present invention is not limited to this, and various arrangements can be taken. .

Next, an embodiment of the sewage septic tank of the present invention will be described with reference to FIG. FIG. 4 is a schematic sectional view of an embodiment of the sewage septic tank of the present invention.
The sewage purification tank includes an anaerobic treatment tank first chamber 21, an anaerobic treatment tank second chamber 22, an aerobic treatment tank 30, a treated water tank (precipitation tank) 40, a disinfection tank 33, and a pump device 50. In addition, a flow rate adjusting unit 25 is provided in the upper part of the anaerobic treatment tank first chamber 21 and the anaerobic treatment tank second chamber 22.

The shape of the filter bed 23 provided in the anaerobic treatment tanks 21 and 22 is not particularly limited, and is a plate-like member such as a loofah-like, corrugated plate, or porous member, a honeycomb-like (honeycomb core) member, or the like. Is preferably used. Skeletal spherical, mesh-like cylindrical members and the like can also be used.
The filter bed 23 may be provided only in the second chamber 22 of the anaerobic filter bed, or may be removed from both the first chamber 21 and the second chamber 22 of the anaerobic filter bed.

  A flow rate adjusting unit 25 is provided in the upper part of the anaerobic treatment tank first chamber 21 and the anaerobic treatment tank second chamber 22. A transfer air lift pump 27 is provided in the vicinity of the outlet of the second anaerobic treatment chamber 22, and the suction port 26 of the transfer air lift pump 27 is connected to the L.P. W. L is provided. The transfer air lift pump 27 is connected to the blower 35 by an air pipe 53. The suction port 26 is preferably provided in the advection pipe 24 in order to prevent inflow of sludge and the like that have floated on the water surface.

  The water levels in the anaerobic treatment tanks 21 and 22 rise when the inflow amount of sewage is larger than the liquid feed amount of the transfer air lift pump 27, and fall when the amount is less. W. L and H.M. W. Move up and down with L. In addition, since the liquid feeding capability of the air lift pump 27 for transfer is set more than the amount of inflow sewage assumed, the water level of the anaerobic treatment tanks 21 and 22 is usually H.P. W. L is never exceeded.

  In this embodiment, an air lift pump type is used for the transfer air lift pump 27 provided in the second chamber 22 of the anaerobic treatment tank. However, instead of the air lift pump type, an intermittent metering pump or an electric pump by pneumatic feeding of a sealed container is used. It may be used. Further, in this embodiment, the flow rate adjusting unit 25 is provided in the upper part of the anaerobic treatment tank first chamber 21 and the anaerobic treatment tank second chamber 22, but it may be provided only in either one or may be omitted. .

  The aerobic treatment tank 30 includes an aerobic reaction chamber 9 in the upper portion and a filtration chamber 10 in the lower portion. In FIG. 4, the aerobic reaction chamber 9 and the filtration chamber 10 are arranged up and down. However, the aerobic reaction chamber 9 and the filtration chamber 10 are not limited to this. It may be installed in a single stroke and can be arranged in various ways. Moreover, the filtration chamber 10 can also be excluded.

  On the downstream side of the aerobic treatment tank 30, a circulation air lift pump 31 for transferring the liquid processed in the aerobic treatment tank 30 to the anaerobic treatment tank first chamber 21 is provided. Although the circulation air lift pump 31 is provided on the downstream side of the filtration chamber 10 in FIG. 4, it may be provided between the aerobic reaction chamber 9 and the filtration chamber 10.

  The biological reaction bed 9a is filled with a filter medium (microorganism carrier, microorganism adhesion material, contact material) for adhering microorganisms for aerobically treating the organic matter in the influent, and below it is a dispersion for reaction. A gas member 11 is provided. The biological reaction bed 9a may be a fluidized bed or a fixed bed.

  The shape of the filter medium can be various shapes such as plate, net plate, loofah, porous, cylinder, rod, skeleton sphere, string, and granular, irregular lump, cube, and fiber lump. What was processed can be used. Examples of the base material include synthetic resin processed products such as polyvinyl chloride, polyester, polyvinylidene chloride, polyvinyl formal, polyurethane, and melamine resin, inorganic processed products such as ceramics and silica sand, and fossils such as anthracite. A processed product, activated carbon or the like having a specific gravity of about 1 or 1 or more, a polyolefin resin such as polyethylene or polypropylene, or a specific gravity of about 1 or 1 or less such as polystyrene can be used.

  A filtration bed 10a filled with a filter medium is formed in the filtration chamber 10 to capture and remove SS in the influent. As the filter medium to be filled, one that floats in the liquid can be used, but a sedimentation filter medium is preferable. Examples of sedimentary filter media include synthetic resin processed products such as polyvinyl chloride, polyester, polyvinylidene chloride, polyvinyl formal, polyurethane, and melamine resin, inorganic processed products such as ceramics and quartz sand, and fossil processing such as anthracite. Products, activated carbon, etc., with specific gravity of about 1 or more, or polyolefin resin such as polyethylene, polypropylene, etc., and those with a specific gravity of about 1 or more adjusted by adding fillers to polystyrene. It may be formed and processed into a lump shape, a cylindrical shape, a net shape, a rod shape, a fiber lump shape, or a porous shape.

  Below the filtration bed 10a, the cleaning air diffuser 12 for washing the filtration bed 10a and the cleaning waste water 44 generated when the SS captured by the filtration bed 10a is peeled off are put in the anaerobic treatment tank first chamber 21. A cleaning drainage pump 14 for transfer is provided.

  The cleaning air diffusing member 12 and the cleaning drainage extraction pump 14 are connected to the blower 35 via the flow path switching device 13 by the air pipe 16. The flow path switching device 13 is a device that switches so that the air sent from the blower 35 is sent to one of the air pipes 15 and 16, and is composed of, for example, a timer and a switching valve. During normal operation, the air from the blower 35 is set to be sent to the air pipe 15, but for example, when the time set by the timer (during the washing operation) is reached, the flow path is switched to the air pipe 16 to wash the filter bed 10a. To do.

  In this embodiment, the pump device 50 is installed in close contact with the outer wall surface on the discharge side of the septic tank body. However, the pump device 50 is not limited to this and may be arranged in a single section in the septic tank. Moreover, it can also be installed in the basement in a state of being separated from the septic tank body, or installed on the ground.

  The pump device 50 is provided with a pump device unit 80 and an air lift pump 7, which are connected to the blower 56 by a gas inflow pipe 5 and an air introduction pipe 7a, respectively. Instead of installing the blower 56, the air pipe 15 connected to the blower 35 may be branched and a part of the air flowing therethrough may be sent to the gas inflow pipe 5 and the gas introduction pipe 7a. In this case, an electromagnetic valve that can be controlled by a timer or the like is provided in the middle of the pipe branched from the air pipe 15, and the valve is opened when it is desired to supply air to the gas inflow pipe 5 and the gas introduction pipe 7a, and the supply of air is stopped. Sometimes a timer is set to close the valve.

  The liquid in the pump device 50 is sent to the aerobic treatment tank 30 through the discharge pipe 4, but the place to send the liquid is not limited to this, and the anaerobic treatment tanks 21 and 22, the treated water tank 40, and the disinfection tank. 33 or the circulating water transfer pipe 31a can be supplied to various locations depending on the type and purpose of the liquid to be supplied.

  Various liquids can be used in the pump device 50. For example, if a solution containing iron salt, aluminum salt, calcium salt or the like is used in this liquid, phosphorus in sewage can be removed by reacting these with phosphate ions to form an insoluble phosphate. . In addition, if a liquid containing microorganisms, enzymes, microbial activity assistants and the like is used, it can contribute to the early start-up of the septic tank and the improvement of the processing function. In addition, various liquids can be used according to the function to be added to the septic tank, such as a pH adjuster, a flocculant, a hydrogen donor for denitrification, nutrient salts, an antifoaming agent, a deodorizing agent, and a disinfecting agent.

  In the treated water tank (precipitation tank) 40, the liquid to be treated that has been subjected to the aerobic treatment in the aerobic treatment tank 30 is temporarily stored and then transferred to the disinfection tank 33. In this embodiment, a treated water tank (precipitation tank) 40 is provided, but this can be omitted.

  The disinfection tank 33 is provided with a medicine cylinder 38 provided with a disinfectant. The liquid to be treated is sterilized here and then discharged from the outlet 41.

  Hereinafter, the treatment of sewage will be described. The sewage enters the anaerobic treatment tank first chamber 21 from the inlet 20, and the solid matter in the inflow sewage is separated and anaerobic treatment is performed. The advection liquid from the anaerobic treatment tank first chamber 21 enters the anaerobic treatment tank second chamber 22, and further solids separation and anaerobic treatment are performed.

  The advection liquid from the anaerobic treatment tank second chamber 22 is transferred to the aerobic treatment tank 30 by the transfer air lift pump 27. In the aerobic treatment tank 30, the organic matter in the advection liquid from the anaerobic treatment tank second chamber 22 is aerobically biodegraded in the aerobic reaction chamber 9. Here, when an iron salt solution (for example, polyferric sulfate) is used for the liquid in the pump device 50, phosphoric acid insoluble in water by reacting iron ions and phosphate ions in the aerobic reaction chamber 9. Iron is formed and captured and filtered in the filtration chamber 10 together with SS generated by biological treatment.

Since the SS accumulates and clogs with the passage of time, the filtration bed 10a is periodically or appropriately (reversely) washed. In this cleaning, the air in the blower 35 is discharged from the cleaning air diffuser 12 to bubble the filter bed 10a, and a part of the air in the blower 35 is caused to flow through the air pipe 17 to be washed and drained withdrawing pump (air lift pump) 14. Also supply. The peeled SS becomes cleaning wastewater 44 together with the liquid in the tank, descends the filtration bed 10a, returns to the first chamber 21 of the anaerobic processing tank through the cleaning drainage discharge member 14a by the cleaning drainage pump 14. Cleaning of the filter bed 10a is usually preferably performed at midnight when sewage is rarely discharged in a general household.
The advection liquid from the aerobic treatment tank 30 passes through the treatment water tank 40, enters the sterilization tank 33, is brought into contact with the medicine cylinder 38 and is sterilized, and is then discharged from the discharge port 41 as treated water.

(Test example)
Test examples using an example of the pump device of the present invention are shown below. The test was performed using the pump apparatus shown in FIG. As a comparative example, an airlift pump test was also conducted. Table 1 shows the specifications of the pump device used for the test, Table 2 shows the test conditions, and Table 3 shows the test results.

  From Table 3, the air lift pump of the comparative example was easily affected by the amount of supplied air, and it was difficult to stably supply a small flow rate of liquid. On the other hand, in the pump of an example of the present invention, even if the flow rate range is as small as 1.0 mL / min to 50 mL / min, it is difficult to be influenced by the air supply amount, and a constant liquid amount can be stably supplied. I understood. The test result is an example of the pump device according to the present invention. By changing the capacity of the second container, the cross-sectional area in the axial direction of the inlet, the discharge pipe, the amount of supply air, etc. Can be stably supplied.

It is a schematic sectional drawing of an example of the pump apparatus which is an Example of this invention, (a) is the state before gas supply, (b) is the state at the time of gas supply (first several seconds), (c) is gas supply The state at the time (after the liquid in the second container 2 is discharged), (d) is the state several seconds after the gas supply is stopped. It is a schematic sectional drawing which shows an example of the pump apparatus which is another Example of this invention. It is a schematic sectional drawing which shows an example of the pump apparatus which is another Example of this invention. It is the schematic which shows an example of the sewage septic tank which is the Example of this invention. It is the schematic which shows an example of the air lift pump of a prior art example. It is the schematic which shows an example of the intermittent metering pump of a prior art example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... 1st container, 2 ... 2nd container, 3 ... Inlet, 4 ... Exhaust pipe, 5 ... Gas inflow pipe, 6 ... Inlet part, 7 ... Air lift pump, 7a ... Air introduction pipe, 7b ... Pumping pipe , 8 ... Third container, 9 ... Aerobic reaction chamber, 9a ... Biological reaction bed, 10 ... Filtration chamber, 10a ... Filtration bed, 11 ... Air diffuser for reaction, 12 ... Air diffuser for cleaning, 13 ... Flow Route switching device, 14 ... washing drain pump, 14a ... washing drainage member, 15 ... air piping, 16 ... air piping, 17 ... air piping, 20 ... inlet, 21 ... anaerobic filter bed first chamber, 22 ... Anaerobic filter bed second chamber, 23 ... Filter bed, 24 ... Advection pipe, 25 Flow rate adjusting unit, 26 ... Suction port, 27 ... Transfer air lift pump, 30 ... Aerobic treatment tank, 31 ... Circulation air lift pump, 31a ... circulating water transfer pipe, 33 ... disinfection tank, 35 ... blower, 38 ... medical cylinder, 40 ... treated water tank, 41 ... Outlet, 43 ... Inflow water, 44 ... Washing drainage, 50 ... Pumping device, 53 ... Air piping, 56 ... Blower, 61 ... Pumping pipe, 62 ... Air feeding pipe, 71 ... Inlet port, 72 ... Pumping pipe, 73 ... Sealed Container, 74 ... air supply pipe, 75 ... lower end, 76 ... open / close valve, 80 ... pump device unit.

Claims (7)

  A first container for storing a liquid, and a second container stored so as to be immersed in the liquid in the first container, the second container being a liquid in the first container An inlet for taking the liquid into the second container, a discharge pipe for discharging the liquid in the second container to the outside of the first container, and a gas inflow that pressurizes the liquid in the second container and pushes it out to the discharge pipe A pump device having a tube.   The pump device according to claim 1, wherein the cross-sectional area of the inlet is less than the cross-sectional area of the discharge pipe in the axial direction.   3. The pump device according to claim 1, wherein the inlet is provided on the bottom surface of the second container.   The pump device according to any one of claims 1 to 3, wherein an axial cross-sectional area of the discharge pipe is equal to or smaller than a cross-sectional area of a surface on which the discharge pipe of the second container is installed.   The pump device according to any one of claims 1 to 4, wherein the liquid in the third container is supplied into the first container by the air lift pump into the third container having the air lift pump and overflows. And a pump device arranged to accommodate the overflowed liquid again in the third container.   6. The pump device according to claim 5, wherein the gas supplied to the air lift pump is a part of the gas sent to the gas inlet pipe of the second container. A sewage septic tank comprising the pump device according to any one of claims 1 to 6.

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