JP2003265940A - Underwater agitation apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a high-performance underwater agitation apparatus which is suitable when a bad smell is prevented from being caused from the waste water of a kitchen or when waste water is treated and has excellent maintainability and a long service life. <P>SOLUTION: An underwater pump 3 is arranged in a treating tank so that the suction port 5 of the pump 3 or the suction port of a suction bend 1 is opened to the middle layer part of the water in the treating tank. A gas-liquid sucking pipe 10 is drawn down from a suction port 8 opened to the surface layer part of the water in the treating tank and connected to the suction part of an ejector 13. A discharge conduit 14 drawn up from the discharge port 15 of the pump 3 is folded back in an inverted U-shaped form and the tip part of the folded-back conduit 14 is connected to the primary side of the ejector 13. The terminal end of a discharge pipe 16 which is drawn down from the secondary side of the ejector 13 and bent to horizontal direction is formed as a side-opened gas-liquid discharging pipe 17. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an underwater agitator used for treating kitchen wastewater, for example.

[0002]

2. Description of the Related Art Since the scum floating on the surface layer is sucked using the suction action of the pump, the conventional submersible agitator has a pump of the submersible pump 103 installed in the treatment tank as shown in FIG. The suction port 105 communicates with a suction bell mouth 108 opened at the surface layer of water in the tank, and the suction pipe 1
The structure is such that air in the atmosphere is drawn into the back of the blades through 12 and is discharged from the pump discharge port 115 as a gas-liquid mixed stirring flow.

However, in this structure, since a large amount of air is sucked into the pump suction port 105 at the same time as the scum, the pumping capacity of the pump is remarkably lowered, and the suction action becomes unstable, thereby increasing the load fluctuation of the pump, Furthermore, cavitation is induced, which shortens the life of the pump. In addition, with the drastic decrease in the above-mentioned pumping capacity, it is impossible to supply a sufficient amount of discharged water, and it is not possible to obtain a negative pressure necessary for suction into the atmosphere. Become.

When the opening surface of the suction bell mouth 108 is set at a position deeper below the surface layer of the water in the tank as a measure for preventing the atmosphere from being entrained in the pump suction port 105, it floats on the surface layer. Since the scum cannot be sucked and the scum layer gradually grows, a work of collecting and removing the scum layer is separately required, which increases labor and running cost. In addition, since the structure is installed in the processing tank, when the submersible pump 103 fails or is maintained,
Each time, the submersible water in the tank must be drained to remove the submersible pump 103 from the bottom of the tank, which is very troublesome.

[0005]

It is an object of the present invention to provide a submersible agitator which is suitable for preventing offensive odors in kitchen drainage and for treating wastewater, has excellent maintainability, has a long life, and has high performance.

[0006]

According to the first aspect of the present invention, in the submersible agitator according to the present invention, the treatment tank is such that the suction port of the pump or the suction port of the suction bend connected to the pump suction port is opened in the middle layer of the water in the tank. A submersible pump is installed inside, and the gas-liquid suction pipe is guided through the suction port that is opened in the surface layer of the water in the tank, and the gas-liquid suctioned to the suction part of the ejector that holds the nozzle in a downward position. A suction pipe is connected, the discharge conduit that is upwardly guided from the pump discharge port of the submersible pump is folded back in an inverted U shape, and the lower end of the guide is connected to the primary side of the ejector, and from the secondary side of the ejector. It is characterized in that the end of the discharge pipe bent down and bent in the lateral direction is formed in a side-open type gas-liquid discharge port. In the underwater agitator according to claim 2 of the present invention, the suction bend is installed in the treatment tank so that the suction port of the suction bend is opened to the middle layer of the water in the tank, and the lifting and lowering is set up in the treatment tank. When the submersible pump is lowered by the guide of the guide, the locking claw attached to the upper part of the pump suction port is locked to the upper edge of the outlet of the suction bend, and the pump suction port is in conduction with the outlet. The submersible pump was detachably installed in the tank, and the gas-liquid suction pipe was guided down from the suction port that was opened in the surface layer of the water in the tank, and was guided down to the suction part of the ejector that held the nozzle in a downward position. A gas / liquid suction pipe is connected, the discharge conduit that is upwardly guided from the pump discharge port of the submersible pump is folded back into an inverted U shape, and the lower end of the guide is connected to the primary side of the ejector. The end of the discharge pipe bent from the side and bent in the lateral direction. Characterized by being formed into an open-type gas-liquid outlet of. In the underwater stirring apparatus according to claim 3 of the present invention, a float is attached around the suction port opened in the surface layer of the water in the tank, and a flexible pipe part is provided in the gas-liquid suction pipe guided from the suction port. Is provided, and the flexible pipe portion is configured to expand and contract in the vertical direction in response to fluctuations in the water level in the tank. In the underwater stirring apparatus according to claim 4 of the present invention, an intake pipe having an upper end opened to the atmosphere is inserted downward from the suction port, and a lower end of the intake pipe is opened into the gas-liquid suction pipe. It is characterized by being.

[0007]

Embodiments will be described below with reference to the embodiments shown in FIGS.

1 is a suction bend fixed in the processing tank so that the suction port 2 is opened in the middle layer of the water in the tank, and 3 is movable up and down by the guide of an elevating guide 4 installed upright in the processing tank. It is a submersible pump, and when it descends, the locking claw 6 attached to the upper part of the pump suction port 5 is locked to the upper edge of the delivery port 7 of the suction bend 1, so that the pump suction port 5 and the delivery port 7 are connected. The submersible pump 3 is installed in the processing tank depending on the state of conduction. Reference numeral 8 denotes a bellmouth-shaped suction port opened in the surface layer of water in the tank, 9 in FIG. 1 is a float attached around the suction port 8, and 10 is gas-liquid suction guided from the suction port 8. The pipe is guided from the suction port 8 through the flexible pipe portion 11 in the embodiment of FIG. 1, and is guided directly below the suction port 8 in the embodiment of FIG. An intake pipe 12 having an upper end opened to the atmosphere at a high position is inserted through the suction port 8 so as to be guided downward, and a lower end thereof is opened into the gas-liquid suction pipe 10. 13 is a nozzle
An ejector (not shown) is held in a downward posture, and the guided gas-liquid suction pipe 10 is connected to a suction portion provided between the primary side and the secondary side of the ejector 13. It Reference numeral 14 denotes a discharge conduit that is upwardly guided from the pump discharge port 15, and is folded back in an inverted U-shape from the upper conductive portion, and the guided lower end portion thereof is connected to the primary side of the ejector 13. Reference numeral 16 is a discharge pipe that is bent down from the secondary side of the ejector 13 and is bent so as to change its direction in the lateral direction. The terminal end that is led out in the lateral direction is formed in the gas-liquid discharge port 17 of the side opening type. ing.

[0009]

When the submersible pump 3 is driven in the treatment tank, depending on the installation mode of the submersible pump 3, the water in the middle layer tank sucked through the suction port 2 of the suction bend 1 or directly from the pump suction port 5 is removed. , Is accelerated by the impeller in the pump casing to form high-pressure pumped water, and is discharged from the pump discharge port 15 to the discharge conduit 1.
4 is ejected toward the secondary side through the nozzle of the ejector 13, and a negative pressure is generated in the suction portion of the ejector 13 by the action of the ejected water, and the negative pressure is generated. From the suction port 8 of the surface layer and the scum floating in the surface layer and an appropriate amount of air are simultaneously sucked, and in the embodiment of FIG. The scum floating on the surface layer is sucked, and an appropriate amount of air is sucked from the intake pipe 12, mixed with the jetted water from the discharge conduit 14 inside the ejector 13, and the suctioned substance from the gas-liquid suction pipe 10 is absorbed. The gas-liquid mixed flow is discharged from the side-open type gas-liquid discharge port 17. In the mode in which the float 9 and the flexible pipe portion 11 are provided as shown in FIG. 1, it is possible to quickly respond to the fluctuation of the water level in the tank, and in the mode in which the intake pipe 12 is provided as shown in FIG. 2, the scum layer is increased. A corresponding atmospheric suction action can be secured.

[0010]

According to the submerged agitator of the present invention, water is sucked from the suction port 2 of the suction bend 1 or the suction port 5 of the submersible pump 3 which is opened in the middle layer portion of the water in the tank, so that the air in the pump casing is prevented. Since there is no entrapment and little foreign matter is sucked in, a large foreign matter is not entangled in the impeller, etc., and a stable water absorption state can be secured at all times, and high-pressure pumped water can be stably supplied to the ejector 13 without load fluctuation of the pump. ,
At the suction part of the ejector 13, a negative pressure sufficient to simultaneously suck the water in the tank of the surface layer, the scum floating on the surface layer, and an appropriate amount of atmosphere can be stably obtained. Further, the aspirated water in the tank in the surface layer, scum, and an appropriate amount of air are ejected to eject high-pressure pumped water from the primary side of the upper end to the secondary side of the lower end in the ejector 13 with the nozzle held downward. The flow facilitates gas-liquid mixing, and a vigorous gas-liquid mixing stirring flow containing a large amount of organic substances and air is obtained. Further, as described above, the suction of water from the middle layer does not induce cavitation and the negative pressure does not fluctuate due to suction, so that the pump life is extended. Furthermore, by making the submersible pump 3 detachable, there is an advantage that workability during failure or maintenance can be improved.

[Brief description of drawings]

FIG. 1 is a configuration diagram of an underwater stirring apparatus according to an embodiment of the present invention, showing an example in which a float is attached around a suction port and a flexible pipe section is provided in a gas-liquid suction pipe.

FIG. 2 is a configuration diagram of an underwater stirring apparatus according to an embodiment of the present invention, showing an example in which a suction pipe having an upper end opened to the atmosphere is inserted into a gas-liquid suction pipe from a suction port. Show.

FIG. 3 is a configuration diagram of a conventional underwater stirring device.

[Explanation of symbols]

1 suction bend 2 Suction port 3 submersible pumps 4 Lifting guide 5 Pump suction port 6 locking claws 7 exit 8 suction port 9 Float 10 Gas-liquid suction tube 11 Flexible pipe section 12 Intake pipe 13 ejectors 14 Discharge conduit 15 Pump outlet 16 discharge tube 17 Gas-liquid outlet

   ─────────────────────────────────────────────────── ─── Continued front page    F-term (reference) 4D029 AA01 AA09 AB03 DD01                 4D051 AA04 AB02 CA15 DC07 DC14                 4G035 AB20 AB21 AC24

Claims (4)

[Claims] 1. A submersible pump is installed in the treatment tank so that the suction port of the pump suction port or the suction port of the suction bend connected to the pump suction port is opened in the middle layer portion of the water in the tank, and the surface layer portion of the water in the tank is provided. The gas-liquid suction pipe is guided from the suction port opened in the, and the gas-liquid suction pipe is guided to the suction part of the ejector holding the nozzle in the downward position, and the pump discharge port of the submersible pump is connected. The discharge conduit guided upward is folded back in an inverted U shape, and the leading end portion of the discharge conduit is connected to the primary side of the ejector, and the discharge pipe bent downward from the secondary side of the ejector is bent laterally. An underwater agitator characterized in that the end is formed in a side-opening type gas-liquid discharge port. 2. The submersible pump is lowered by the guide of an elevating guide installed upright in the treatment tank, wherein the suction bend is installed in the treatment tank so that the suction inlet of the suction bend is opened in the middle layer of the water in the tank. At this time, the locking claw attached to the upper part of the pump suction port is locked to the upper edge of the outlet of the suction bend, and the submersible pump is detachably installed in a state where the pump suction port is electrically connected to the outlet. , The gas-liquid suction pipe is guided from the suction port opened in the surface layer of the water in the tank, and the guided gas-liquid suction pipe is connected to the suction part of the ejector holding the nozzle in the downward position, The discharge conduit upwardly guided from the pump discharge port of the submersible pump is folded back in an inverted U shape, and the lower end portion of the guide is connected to the primary side of the ejector, and is guided downward from the secondary side of the ejector to the lateral direction. The end of the bent discharge pipe was formed as a side-opening gas-liquid discharge port. An underwater stirring device. 3. A float is attached around the suction port opened in the surface layer of the water in the tank, and a flexible pipe section is provided in the gas-liquid suction pipe guided from the suction port to prevent fluctuation of the water level in the tank. Correspondingly, the flexible pipe part is configured to expand and contract in the vertical direction, and the submersible agitator according to claim 1 or 2. 4. An intake pipe, the upper end of which is opened to the atmosphere, is inserted downward from the suction port, and the lower end of the intake pipe is opened into the gas-liquid suction pipe. The underwater agitator according to claim 1.