JP2008274781A - Drainage pump device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To efficiently discharge foreign matter staying or depositing in a water tank bottom part, without lowering a water level in a water tank more than necessary. <P>SOLUTION: This drainage pump device is provided for draining liquid in the water tank by arranging a submerged pump and pipes in the water tank. An ejector is arranged on the delivery side of the submerged pump, and a suction port of a suction pipe of this ejector is extended below a suction port of the submerged pump. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention is a drainage pump device that is installed in a water tank such as a sewage drainage tank and efficiently discharges foreign matter staying or depositing on the bottom of the water tank to prevent malodor caused by foreign matter staying or depositing on the bottom of the water tank. About.

  Conventionally, for example, in a drainage pump device placed in a sewage drainage tank such as a manhole placed at an appropriate place in a sewage flow pipe system that connects a sewage generation source and a sewage treatment plant, a foreign matter that causes odors at the bottom of the water tank It is required to drain the sewage in the water tank without retaining or accumulating water. For this reason, for example, a spiral recess that generates a swirling flow is provided at the bottom of the water tank, and a submersible pump is installed in the water tank so that the suction port of the suction part extending downward is located in the recess. With the operation of the submersible pump, there has been proposed one that drains the sewage in the aquarium while generating a swirling flow in the sewage in the aquarium (see, for example, Patent Documents 1 and 2).

Japanese Patent Laid-Open No. 9-209992 JP 2004-52396 A

  However, even if the submersible pump is installed in the water tank so that the suction port is located in the recess provided at the bottom of the water tank, in order to reliably suck out foreign matter that accumulates or accumulates in the bottom of the water tank, Even if the water level drops, it is necessary to continue pump operation.If the water level in the aquarium drops more than necessary, the motor of the submersible pump is exposed to the air, and air may be sucked into the pump from the suction side. growing. When the motor of the submersible pump is exposed to the air, the motor becomes insufficiently cooled and overheats. As a result, the protective device is activated, the pump is stopped, and the bearings are adversely affected. In addition, if air is sucked into the pump from the suction side, the pump does not operate normally and the suction performance of the pump deteriorates.

  The present invention has been made in view of the above circumstances, and provides a drainage pump device capable of efficiently discharging foreign matter staying or accumulating at the bottom of a water tank without lowering the water level in the water tank more than necessary. With the goal.

  According to the first aspect of the present invention, in the drainage pump device for installing the submersible pump and piping in the water tank and draining the liquid in the water tank, an ejector is provided on the discharge side of the submersible pump, and the suction pipe of the ejector It is a drainage pump device characterized in that the suction port extends below the suction port of the submersible pump.

  Thereby, in a state where the water level of the aquarium is higher than the suction port of the submersible pump installed in the aquarium, therefore, by operating the submersible pump while operating the motor in a submerged state and preventing motor overheating, Foreign matter staying or accumulating at the bottom of the water tank can be sucked and discharged through a suction pipe of an ejector whose suction port extends to a position below the suction port of the submersible pump.

According to a second aspect of the present invention, the drainage pump according to the first aspect is characterized in that a check valve is provided in the suction pipe of the ejector to open the flow path in the case of suction and close the flow path in the case of discharge. Device.
Thereby, it is possible to prevent the fluid pumped up by the submersible pump installed in the water tank from flowing back through the suction pipe of the ejector and returning into the water tank.

  The invention described in claim 3 further includes a submersible pump attaching / detaching device, and the ejector is disposed on the downstream side of the attaching / detaching device. It is.

The invention according to claim 4 further includes a submersible pump attaching / detaching device, and the ejector is installed between the submersible pump and the submersible pump attaching / detaching device, and is assembled to the submersible pump to be a guide pipe of the attaching / detaching device. It is comprised so that it can move up and down along, The drainage pump apparatus characterized by the above-mentioned.
Thereby, maintenance, replacement, etc. of the ejector can be performed easily and promptly.

  According to the drainage pump device of the present invention, the water level in the aquarium is not lowered more than necessary, and therefore the motor is operated in a submerged state to prevent the motor from overheating, and the submersible pump is operated to stay at the bottom of the aquarium. Or the accumulated foreign matter can be discharged. Further, since the pump operation at a low water level can be avoided, it is possible to prevent the pump from sucking air and being unable to operate normally. Furthermore, since the unevenness | corrugation of the structure of a water tank bottom part can also be made small, manufacture of a water tank and installation of a drainage pump apparatus become easy.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following description, the same or corresponding members are given the same reference numerals, and duplicate descriptions are omitted.

  FIG.1 and FIG.2 shows the state which installed the drainage pump apparatus 10 of embodiment of this invention in water tank 12, such as a sewage drainage tank containing a manhole, for example. As shown in FIG. 1, the drainage pump device 10 is mainly composed of a vertical submersible pump 14, an attaching / detaching device 16 for the submersible pump 14, and a discharge pipe 18 extending upward in the vertical direction. An ejector 22 having a suction pipe 20 extending downward in the direction is installed.

  As shown in FIG. 2, the submersible pump 14 is arranged with its suction port (pump suction port) 14 a facing downward, and the periphery of the pump suction port 14 a is surrounded by a strainer 24. The submersible pump 14 is configured to move up and down along a pair of guide rails 26 of the attachment / detachment device 16 and to be installed at a predetermined position in the water tank 12. The submersible pump 14 has a discharge port (pump discharge port). 14 b communicates with an elbow pipe 28 of the discharge pipe 18 through a flow path 16 a in the attachment / detachment device 16. An ejector 22 is installed between the elbow pipe 28 and the vertical pipe 30 of the discharge pipe 18.

  The ejector 22 includes a jet nozzle 32 connected to the elbow pipe 28 and a diffuser 34 surrounding the jet nozzle 32, and the vertical pipe 30 is connected to the diffuser 34. The suction pipe 20 is connected to a suction port (diffuser suction port) 34 a provided in the diffuser 34 via an elbow-shaped check valve 36. A ball 38 is arranged inside the check valve 36 so as to open the flow path in the case of suction and close the flow path in the case of discharge.

  The suction port (suction tube suction port) 20a at the lower end of the suction tube 20 of the ejector 22 extends below the suction port (pump suction port) 14a of the submersible pump 14, that is, the height of the suction tube suction port 20a. The position along the vertical direction is lower by the distance H than the position along the height direction of the pump suction port 14a. Here, as shown in FIG. 2, it is preferable that a recess 12 a is provided in the bottom wall of the water tank 12, and the suction pipe suction port 20 a of the ejector 22 is located in the recess 12 a, so that the water is not drained into the water tank 12. The amount of sewage remaining in the water can be reduced.

  According to this example, when the water level in the water tank 12 reaches a predetermined water level, the operation of the submersible pump 14 is started and drainage in the water tank 12 is started. As the submersible pump 14 is operated, the water level gradually decreases in the water tank 12. At this time, when the pressure in the diffuser 34 of the ejector 22 is high, the ball 38 of the check valve 36 closes the internal water passage, whereby the fluid pumped up by the submersible pump 14 flows back through the suction pipe 20 of the ejector 22. Returning into the water tank 12 is prevented. When the pressure in the diffuser 34 of the ejector 22 becomes lower than a predetermined pressure, the foreign matter staying or accumulating at the bottom of the water tank 12 is pumped into the ejector 22 through the suction pipe 20 and discharged from the discharge pipe 18 to the outside. .

  Thereby, in a state where the water level of the water tank 12 is higher than the suction port 14a of the submersible pump 14 installed in the water tank 12, the motor is operated in a submerged state to prevent the motor from being overheated. By operating, the foreign matter staying or accumulating at the bottom of the water tank 12 can be sucked and discharged through the suction pipe 20 of the ejector 22 in which the suction port 20a extends to the lower side of the suction port 14a of the submersible pump 14.

  3 and 4 show a state in which the drainage pump device 10a according to another embodiment of the present invention is installed in the water tank 12. FIG. As shown in FIG. 3, in the drainage pump device 10 a of this example, an ejector 22 is disposed between the submersible pump 14 and the attachment / detachment device 16. And the submersible pump 14 and the ejector 22 are assembled | attached integrally, move up and down integrally along the guide rail 26 of the attachment / detachment apparatus 16, and are installed in the predetermined position in the water tank 12. FIG. . Thereby, maintenance and replacement of the ejector can be easily and quickly performed. Further, the elbow pipe 28 and the vertical pipe 30 of the discharge pipe 20 are directly connected.

  The ejector 22 is disposed such that the diffuser suction port 34a faces downward, and a straight check valve 36a having a ball 38a therein is interposed between the diffuser suction port 34a and the suction pipe 20. Other configurations are the same as those in the above example.

  In each of the above examples, the suction pipe 20 may be directly connected to the diffuser suction port 34a of the ejector 22 without providing the check valves 36, 36a.

  FIG. 5 shows a state in which a drainage pump device 10b according to still another embodiment of the present invention is installed in the water tank 12. In this example, the discharge pipe 18 is directly connected to the discharge port of the submersible pump 14 without providing an attachment / detachment device. And the ejector 22 is installed in the straight pipe part of the discharge pipe 18, the suction pipe 20 extended in the perpendicular direction is connected to the ejector 22 via the elbow pipe 40, and the suction port 20a at the lower end of the suction pipe 20 is connected to the submersible pump. 14 is extended below the suction port.

  Although one embodiment of the present invention has been described so far, it is needless to say that the present invention is not limited to the above-described embodiment, and may be implemented in various forms within the scope of the technical idea.

It is a longitudinal cross-sectional view which shows the state which installed the drainage pump apparatus of embodiment of this invention in the water tank. It is a longitudinal cross-sectional view which shows the detail of the drainage pump apparatus shown in FIG. It is a longitudinal cross-sectional view which shows the state which installed the drainage pump apparatus of other embodiment of this invention in the water tank. It is a longitudinal cross-sectional view which shows the detail of the drainage pump apparatus shown in FIG. It is a longitudinal cross-sectional view which shows the state which installed the drainage pump apparatus of further another embodiment of this invention in the water tank.

Explanation of symbols

10, 10a, 10b Drain pump device 12 Water tank 14 Submersible pump 14a Pump suction port 14b Pump discharge port 16 Detachment device 18 Discharge tube 20 Suction tube 20a Suction tube suction port 22 Ejector 26 Guide rail 32 Jet nozzle 34 Diffuser 34a Diffuser suction port 36 36a Check valve

Claims (4)

In a drainage pump device that installs a submersible pump and piping in the tank and drains the liquid in the tank,
2. A drainage pump device comprising: an ejector provided on a discharge side of a submersible pump; and a suction port of a suction pipe of the ejector extending below a suction port of the submersible pump.   2. The drainage pump device according to claim 1, wherein a check valve is provided in the suction pipe of the ejector to open the flow path when suctioning and close the flow path when discharging.   The drainage pump device according to claim 1 or 2, further comprising a submersible pump attaching / detaching device, wherein the ejector is installed on a downstream side of the attaching / detaching device.   A submersible pump attachment / detachment device is further provided, and the ejector is installed between the submersible pump and the submersible pump attachment / detachment device, and is configured to be assembled with the submersible pump so as to move up and down along the guide pipe of the attachment / detachment device. The drainage pump device characterized by being made.

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