JP2020200817A - Submerged pump device and submerged pump system using the same - Google Patents

Abstract

To improve the operation efficiency of a submerged pump device and discharge scum etc. from a sewage tank properly in a state that a sufficient amount of discharge water in a pump body is secured.SOLUTION: A pump body 21 has: a first discharge part 26 which discharges sewage water suctioned into the pump body 21 to a drain pipe 12; and a second discharge part 27 which discharges a part of the sewage water. An opening area of a passage in the second discharge part 27 is smaller than an opening area of a passage in the first discharge part 26. The passage of the second discharge part 27 is constantly open. The pump body 21 is provided with a jet pipe 28 connected to the second discharge part 27. The jet pipe 28 is configured so that the sewage water jetted to a sewage tank 1 through the second discharge part 27 generates swirl flow in storage water in the sewage tank 1.SELECTED DRAWING: Figure 3

Description

The present disclosure relates to a submersible pump device and a submersible pump system using the same.

Conventionally, as a submersible pump device installed in a sewage tank, for example, a submersible pump device provided with a stirring device in the pump tank as in Patent Document 1 has been proposed.

In Patent Document 1, a pump main body (submersible pump) installed in a sewage tank and a part or all of a jet flow from the pump main body attached to the pump main body for a certain period of time at the start of operation of the pump main body are in the water tank. A submersible pump device including a pump tank stirrer that discharges the pump to stir the sewage tank is disclosed.

The pump body comprises a pump casing having a pump chamber for accommodating the impeller. The pump casing is provided with a pump discharge port for discharging the sewage sucked into the pump body to the drain pipe installed in the sewage tank and a jet discharge port for discharging the jet flow to the agitator in the pump tank. ing.

The in-pump tank agitator has a casing provided on the side wall so that the inflow portion and the discharge portion face each other and the valve accommodating portion communicates with the inflow portion and the discharge portion. It includes a valve seat provided at the upstream end opening located on the valve accommodating portion side, a diaphragm provided at the bottom of the valve accommodating portion, and a ball valve movably accommodated in the valve accommodating portion. In this pump tank agitator, the ball valve is located at the bottom of the valve accommodating part with the ball valve mounted on the diaphragm when the valve is opened, while the diaphragm is displaced upward due to the negative pressure generated in the valve accommodating part when the valve is closed. However, the ball valve sits on the valve seat and closes the discharge part.

Then, from the start of operation (operation) of the submersible pump device to the elapse of a certain period of time, the jet flow from the pump body is discharged from the discharge section into the sewage tank via the agitator in the pump tank in the valve open state. Will be done. Further, by closing the valve in the pump tank agitator after keeping the valve open state for a predetermined time, the jet flow from the agitator in the pump tank is stopped.

Japanese Patent No. 4919389

In the submersible pump device of Patent Document 1, the jet flow from the pump body is discharged from the discharge unit into the sewage tank via the stirring device in the pump tank in the valve open state. As a result, the stored water in the sewage tank is agitated, and after sand, sludge, suspended oil, scum, etc. accumulated or accumulated in the sewage tank are sucked into the pump body, the outside of the sewage tank is removed from the drain pipe through the pump discharge port. Is discharged to. As a result, sand and sludge are prevented from accumulating and accumulating in the sewage tank, and floating fats and oils and scum are prevented from sticking to the wall surface of the sewage tank.

However, in the agitator in the pump tank, the internal structure for opening and closing the valve is complicated. For example, a phenomenon in which the discharge portion is instantaneously blocked by the ball valve or the blocked state continues for a long time. The phenomenon of closing occurs. In order to prevent such a phenomenon, it was necessary to perform regular maintenance to see if the stirring device in the pump tank was operating well. In addition, if foreign matter in the sewage tank enters the stirring device in the pump tank, the valve seat may be blocked by the foreign matter, and in such a case, work must be performed to remove the foreign matter. It was. As described above, in the submersible pump device of Patent Document 1, regular maintenance must be performed frequently in order to continuously operate the agitator in the pump tank, and the operating efficiency of the submersible pump device is lowered. There was a case.

The present disclosure has been made in view of these points, and the purpose of the present disclosure is to improve the operating efficiency of the submersible pump device in a state where the amount of discharged water of the pump body is sufficiently secured, and to appropriately remove scum from the sewage tank. Is to be discharged to.

In order to achieve the above object, in the conventional configuration in which a part of the sewage sucked by the submersible pump is ejected into the sewage tank to generate a swirling flow (the configuration according to the submersible pump device of Patent Document 1), the ejection time However, the present inventor has appropriately designed the second discharge portion, which is a component according to the first embodiment of the present disclosure, so as to prevent the problem of drainage of sewage. It was discovered that it is possible to achieve both drainage of sewage and generation of swirling flow without limiting the time, and to solve the problems caused by the conventional configuration that limits the ejection time.

Specifically, in the first embodiment of the present disclosure, the submersible pump device includes a pump body installed in a sewage tank, and the pump body includes a suction portion for sucking the stored water in the sewage tank into the pump body. The sewage sucked into the pump body is located in the vicinity of the first discharge part and the first discharge part for discharging the sewage sucked into the sewage tank along the first direction toward the drain pipe installed in the sewage tank, and is sucked into the pump body. It has a second discharge unit for discharging a part of the collected sewage along a second direction different from the first direction. The second discharge portion is configured so that the opening area of the flow path is smaller than the opening area of the flow path in the first discharge portion. The flow path of the second discharge portion is always open. The pump body is provided with a tubular ejection pipe that is connected to the second discharge portion and protrudes toward the outside of the pump body, and the ejection pipe is provided in a sewage tank via the second discharge portion. It is characterized in that it is configured to generate a swirling flow in the stored water of the sewage tank by the sewage ejected from the sewage tank.

In the first embodiment, the second discharge portion is configured so that the opening area of the flow path is smaller than the opening area of the flow path in the first discharge portion. According to such a configuration, the amount of sewage discharged from the first discharge portion to the drain pipe (the amount of discharged water) can be made larger than the amount of sewage ejected from the ejection pipe to the sewage tank via the second discharge portion. .. That is, in the first embodiment, the opening of the flow path in the second discharge portion is appropriately set, so that the amount of sewage discharged from the first discharge portion to the drain pipe is sufficiently secured. ..

Further, the tubular ejection pipe is connected to a second discharge portion whose flow path is always open. That is, in the first embodiment, the structure for agitating the stored water in the sewage tank is simplified. Therefore, a complicated structure for opening and closing the valve as in the conventional agitator in the pump tank becomes unnecessary. As a result, it is not necessary to perform regular maintenance frequently, and the operating efficiency of the submersible pump device is improved.

The ejection pipe is configured to generate a swirling flow in the stored water of the sewage tank by the sewage ejected into the sewage tank via the second discharge portion. According to such a configuration, it is possible to constantly generate a swirling flow in the stored water of the sewage tank by the sewage ejected into the sewage tank through the second discharge portion whose flow path is always open. The swirling flow agitates the stored water in the sewage tank, and sand, sludge, suspended oil, scum, etc. accumulated or accumulated in the sewage tank are sucked into the pump body and then from the drain pipe via the first discharge portion. It is discharged to the outside of the sewage tank. As a result, sand and sludge are prevented from accumulating and accumulating in the sewage tank, and floating fats and oils and scum are prevented from sticking to the wall surface of the sewage tank.

Therefore, in the first embodiment, the operating efficiency of the submersible pump device can be improved and the scum or the like can be appropriately discharged from the sewage tank while the amount of discharged water of the pump body is sufficiently secured.

The second form is characterized in that, in the first form, the amount of sewage ejected from the ejection pipe is 10 to 50% of the amount of sewage discharged from the first discharge portion. And.

In this second mode, the amount of water discharged from the first discharge unit is more than twice the amount of water ejected from the ejection pipe. That is, the amount of sewage discharged from the first discharge portion to the drain pipe is sufficiently secured. Further, since the amount of sewage ejected from the ejection pipe via the second discharge portion is 10 to 50% of the amount of sewage discharged from the first discharge portion, the stored water in the sewage tank is swirled. Can be agitated. As described above, in the second embodiment, the scum or the like can be appropriately discharged from the sewage tank while the amount of discharged water of the pump body is sufficiently secured.

In the third embodiment, in the second embodiment, the pump body has a pump casing provided with a pump chamber. Each of the first discharge portion and the second discharge portion is provided in the pump casing. The second discharge portion is arranged at a position away from the first discharge portion on the upstream side in the flow of sewage flowing into the pump chamber. The second direction is characterized in that the angle formed with the first direction is an acute angle in a plan view.

In this third embodiment, since each of the first discharge portion and the second discharge portion is provided in the pump casing, the configuration of the pump main body can be simplified. Further, since the second discharge portion is arranged at a position away from the first discharge portion on the upstream side and the angle formed with the first direction is along the second direction which is an acute angle in a plan view. A part of the sewage flowing into the pump chamber can be vigorously discharged from the second discharge portion. As a result, the stored water in the sewage tank is sufficiently agitated by the swirling flow, and scum and the like can be discharged from the sewage tank.

In the fourth form, in the first or second form, the pump main body has a connecting pipe for detachably connecting the first discharge part and the drainage pipe of the sewage tank, and the second discharge part has a connecting pipe. It is characterized in that it is provided in a connecting pipe.

In this fourth embodiment, since the connecting pipe constituting the pump body is provided with the second discharge portion, a part of the sewage flowing to the connecting pipe via the first discharge portion is passed through the second discharge portion. It is possible to efficiently discharge from the ejection pipe. Therefore, the stored water in the sewage tank is sufficiently agitated by the swirling flow, and scum and the like can be appropriately discharged from the sewage tank. Further, since the connecting pipe is removable from the first discharge part and the drainage pipe of the sewage tank, there is a case where at least one of the second discharge part and the ejection pipe has a problem. However, maintenance work is completed simply by replacing the connecting pipe. That is, in the fourth embodiment, the maintainability of the pump body can be improved.

The fifth form is characterized in that, in any one of the first to fourth forms, the ejection pipe is formed in a non-linear manner.

In the fifth embodiment, since the ejection pipe is formed in a non-linear shape, for example, the ejection direction of the sewage ejected from the ejection pipe can be easily aligned with the surface direction of the wall surface in the sewage tank. As a result, a swirling flow is likely to occur with respect to the stored water in the sewage tank, the stored water in the sewage tank is sufficiently agitated, and scum and the like can be appropriately discharged from the sewage tank.

The sixth embodiment is a submersible pump system including any one of the submersible pump devices of the first to fifth embodiments.

In this sixth embodiment, it is possible to obtain a submersible pump system that has the same effect as that of any one of the first to sixth embodiments.

As described above, according to the present disclosure, it is possible to improve the operating efficiency of the submersible pump device and appropriately discharge scum and the like from the sewage tank in a state where the amount of discharged water of the pump body is sufficiently secured.

FIG. 1 is a cross-sectional view schematically showing an overall configuration of a sewage tank in which a submersible pump device according to the first embodiment of the present disclosure and a submersible pump system using the submersible pump device are installed. FIG. 2 is a side view showing a state in which the submersible pump device according to the first embodiment of the present disclosure is installed in a sewage tank with a part omitted. FIG. 3 is a plan view of the submersible pump device according to the first embodiment of the present disclosure. FIG. 4 is a sectional view taken along line IV-IV of FIG. FIG. 5 is a sectional view taken along line VV of FIG. FIG. 6 is a sectional view taken along line VI-VI of FIG. FIG. 7 is a view corresponding to FIG. 2 of the submersible pump device according to the second embodiment of the present disclosure. FIG. 8 is a plan view of the submersible pump device according to the second embodiment of the present disclosure.

Hereinafter, each embodiment of the present disclosure will be described in detail with reference to the drawings. The following description of each embodiment is merely exemplary and is not intended to limit the disclosure, its application or its use.

[First Embodiment]
FIG. 1 shows the entire submersible pump device 20 according to the first embodiment of the present disclosure and the submersible pump system 10 including the submersible pump device 20. The submersible pump system 10 is installed in the sewage tank 1.

(Sewage tank)
As shown in FIG. 1, the sewage tank 1 is provided with a manhole 2 having a lid 3 and an inflow port 4. When the water level in the sewage tank 1 exceeds a predetermined operation level, the sewage flowing into the sewage tank 1 from the inflow port 4 is operated by the submersible pump device 20 until the water level drops to a predetermined stop level. After being sucked into 20, it is discharged from the drain pipe 12 described later.

(Submersible pump system)
As shown in FIG. 1, the submersible pump system 10 mainly includes an elevating chain 11, a drain pipe 12, a detachable portion 13, a guide pipe 14, a control panel 15, float switches 16, 16, ..., And a submersible pump device 20. It has.

The elevating chain 11 is used for elevating and lowering the submersible pump device 20, and is provided inside the sewage tank 1. The elevating chain 11 is configured such that the upper end is connected to the lid 3 of the manhole 2 while the lower end is connected to the upper part of the submersible pump device 20.

The drain pipe 12 is provided inside the sewage tank 1. The drain pipe 12 is arranged at a position facing the inflow port 4 in the sewage tank 1. The drainage pipe 12 includes the first to fourth drainage pipes 12a to 12d.

One end of the first drain pipe 12a is connected to the first discharge portion 26 described later in the submersible pump device 20 by the attachment / detachment portion 13. The other end of the first drain pipe 12a is connected to one end of the second drain pipe 12b. The other end of the second drain pipe 12b is connected to one end of the third drain pipe 12c. The other end of the third drain pipe 12c is connected to one end of the fourth drain pipe 12d.

The first drainage pipe 12a is provided with a support portion 12e for supporting the drainage pipe 12 to the bottom portion 5 of the sewage tank 1. The support portion 12e is attached and fixed to the bottom portion 5 of the sewage tank 1.

The guide pipe 14 extends in the vertical direction from the manhole 2 to the first drain pipe 12a in the sewage tank 1. Specifically, each of the guide pipes 14 is configured such that the upper end portion is attached to the inner wall surface of the manhole 2 while the lower end portion is connected to the middle portion of the first drainage pipe 12a. Although not shown, in this embodiment, two guide pipes 14 are provided in parallel so as to form a pair on the left and right.

The control panel 15 and the float switches 16, 16, ... Are for controlling the operation of the submersible pump device 20. The control panel 15 is arranged above the manhole 2 and is electrically connected to the submersible pump device 20. Further, the float switches 16, 16, ... Are arranged in the sewage tank 1 and are electrically connected to the control panel 15. The float switch 16 includes a float switch 16a for alarming an abnormal water level, a float switch 16b for operation, and a float switch 16c for stopping.

(Submersible pump device)
As shown in FIGS. 1 and 2, the submersible pump device 20 is lowered from the manhole 2 of the sewage tank 1 through the guide pipe 14 to the bottom 5 of the sewage tank 1, and is lowered to the bottom 5 of the sewage tank 1 by the attachment / detachment portion 13 with respect to the drain pipe 12. It is installed in the sewage tank 1 so that it can be attached and detached. The submersible pump device 20 has a pump main body 21 and an electric motor 22 arranged above the pump main body 21. The pump body 21 is made of, for example, a centrifugal pump. The submersible pump device 20 is not provided with a conventional in-pump tank stirring device.

(Pump casing)
As shown in FIGS. 1 to 6, the pump main body 21 has a pump casing 23. The pump casing 23 is formed in a spiral shape, for example (see FIG. 4). The pump casing 23 is provided with a pump chamber 24 for accommodating an impeller (not shown) (see FIGS. 4 to 6).

(Suction part)
As shown in FIGS. 4 to 6, the pump main body 21 has a suction portion 25. The suction unit 25 is for sucking the stored water (sewage) of the sewage tank 1 into the inside of the pump main body 21. The suction portion 25 is configured such that substantially the center of the lower portion of the pump casing 23 is open and communicates with the pump chamber 24.

(1st discharge part)
As shown in FIGS. 1 to 5, the pump main body 21 has a first discharge portion 26. The first discharge unit 26 is for discharging the sewage sucked into the pump main body 21 along the first direction A (see FIGS. 3 to 5) toward the drain pipe 12 installed in the sewage tank 1. is there. The first discharge portion 26 is configured to communicate with the drain pipe 12 in a state of being connected to the first drain pipe 12a by the detachable portion 13 (see FIG. 2).

The first discharge portion 26 is provided in the pump casing 23. The first discharge portion 26 is integrally formed with the side surface of the pump casing 23. The first discharge portion 26 projects in a tubular shape (substantially cylindrical shape) from the side surface of the pump casing 23 toward the first direction A. The opening of the first discharge portion 26 is formed in a substantially circular shape. The first discharge portion 26 is arranged at a position corresponding to substantially the center of the pump casing 23 in the vertical direction.

(2nd discharge part)
As shown in FIGS. 1 to 4 and 6, the pump main body 21 has a second discharge portion 27. The second discharge unit 27 is for discharging a part of the sewage sucked into the pump main body 21 along the second direction B in a direction different from the first direction A. That is, the submersible pump device 20 is configured to simultaneously discharge the sewage sucked into the pump chamber 24 toward both the first direction A of the first discharge unit 26 and the second direction B of the second discharge unit 27. Has been done. Here, the angle formed by the first direction A and the second direction B is configured to be an acute angle (about 45 ° in the illustrated example) in a plan view.

The second discharge portion 27 is formed so that the diameter D2 of the opening thereof is smaller than the diameter D1 of the opening in the first discharge portion 26 described above (see FIGS. 4 to 6). That is, the flow path of the second discharge portion 27 is configured so that the opening area thereof is smaller than the opening area of the flow path in the first discharge portion 26. The second discharge portion 27 is preferably formed so that the diameter D2 of the opening thereof is, for example, ½ or less of the diameter D1 of the opening in the first discharge portion 26.

The second discharge portion 27 is provided in the pump casing 23. The second discharge portion 27 is integrally formed with the side surface of the pump casing 23. The second discharge portion 27 projects in a cylindrical shape (substantially cylindrical shape) from the side surface of the pump casing 23 toward the second direction B. The opening of the second discharge portion 27 is formed in a substantially circular shape.

The second discharge portion 27 is arranged at a position corresponding to substantially the center of the pump casing 23 in the vertical direction. Specifically, the second discharge unit 27 is arranged so that the central position in the vertical direction is the same as the central position in the vertical direction of the first discharge unit 26.

The second discharge portion 27 is arranged in the vicinity of the first discharge portion 26 in the pump casing 23. Specifically, the second discharge unit 27 is upstream (counterclockwise) with respect to the first discharge unit 26 in the water flow of sewage flowing clockwise inside the pump chamber 24 (see arrow F shown in FIG. 4). It is located at a distance (in the clockwise direction).

As shown in FIGS. 4 and 6, the flow path of the second discharge portion 27 is always open. The flow path of the second discharge section 27 is configured so that the opening area thereof is smaller than the opening area of the flow path in the first discharge section 26.

(Extrusive tube)
As shown in FIGS. 1 to 3, the pump main body 21 is provided with a tubular ejection pipe 28. The ejection pipe 28 projects so as to extend straight toward the outside (second direction B) of the pump main body 21. The opening of the ejection pipe 28 is formed in a substantially circular shape. In this embodiment, the opening of the ejection pipe 28 has substantially the same size as the diameter D2 of the opening in the second discharge portion 27.

As shown in FIGS. 4 and 6, the ejection pipe 28 is connected to the second discharge portion 27. Specifically, the ejection pipe 28 has a connecting end portion 28a having a thread formed at one end thereof, and the connecting end portion 28a is screwed with respect to the nut portion 29 joined to the second discharge portion 27. It is connected in the combined state.

The ejection pipe 28 is configured to generate a swirling flow in the stored water of the sewage tank 1 by the sewage ejected into the sewage tank 1 via the second discharge portion 27. When the first discharge unit 26 is open, the amount of sewage ejected from the ejection pipe 28 is configured to be 10 to 50% of the amount of sewage discharged from the first discharge unit 26. ing.

(Operation of submersible pump device)
Next, the basic operation of the submersible pump device 20 will be described.

When the electric motor 22 is operated to activate the submersible pump device 20, an impeller (not shown) rotates. Due to the rotation of the impeller, the stored water (sewage) in the sewage tank 1 is sucked into the pump chamber 24 from the suction port 25 of the pump casing 23 (see FIGS. 5 and 6).

The sewage sucked into the pump chamber 24 is simultaneously discharged toward both the first direction A and the second direction B. Specifically, the sewage sucked into the pump chamber 24 is discharged to the drain pipe 12 through the first discharge unit 26 (see FIGS. 1 and 4). Further, a part of the sewage sucked into the pump chamber 24 is ejected from the ejection pipe 28 to the sewage tank 1 via the second discharge portion 27 (see FIGS. 1 and 4). Then, the sewage ejected from the ejection pipe 28 into the sewage tank 1 causes a swirling flow to be generated in the stored water of the sewage tank 1.

[Action and effect of the first embodiment]
As described above, in the submersible pump device 20 according to the first embodiment, the second discharge portion 27 is configured so that the opening area of the flow path is smaller than the opening area of the flow path in the first discharge portion 26. There is. With this configuration, the amount of sewage discharged from the first discharge unit 26 to the drain pipe 12 (the amount of discharged water) is larger than the amount of sewage ejected from the ejection pipe 28 to the sewage tank 1 via the second discharge portion 27. It is adjusted so that. That is, in the submersible pump device 20, the amount of sewage discharged from the first discharge unit 26 to the drain pipe 12 is sufficiently secured by appropriately setting the opening of the flow path in the second discharge unit 27. It has become.

Further, the tubular ejection pipe 28 is connected to the second discharge portion 27 whose flow path is always open. That is, in the submersible pump device 20, the structure for agitating the stored water in the sewage tank 1 is simplified. Therefore, a complicated structure for opening and closing the valve as in the conventional agitator in the pump tank becomes unnecessary. As a result, it is not necessary to perform regular maintenance frequently, and the operating efficiency of the submersible pump device 20 is improved.

The ejection pipe 28 is configured to generate a swirling flow in the stored water of the sewage tank 1 by the sewage ejected into the sewage tank 1 via the second discharge portion 27. According to such a configuration, it is possible to constantly generate a swirling flow in the stored water of the sewage tank 1 by the sewage ejected into the sewage tank 1 through the second discharge portion 27 whose flow path is always open. The stored water in the sewage tank 1 is agitated by this swirling flow, and sand, sludge, suspended oil, scum, etc. accumulated or accumulated in the sewage tank 1 are sucked into the pump body 21 and then passed through the first discharge unit 26. It is discharged from the drain pipe 12 to the outside of the sewage tank 1. As a result, sand and sludge are prevented from staying and accumulating in the sewage tank 1, and floating fats and oils and scum are prevented from sticking to the wall surface of the sewage tank 1.

Therefore, in the submersible pump device 20 according to the first embodiment, the operating efficiency of the submersible pump device 20 is improved and the scum and the like are appropriately discharged from the sewage tank 1 in a state where the discharge water amount of the pump main body 21 is sufficiently secured. can do.

Further, the amount of sewage ejected from the ejection pipe 28 is configured to be 10 to 50% of the amount of sewage discharged from the first discharge unit 26. According to such a configuration, the amount of water discharged from the first discharge unit 26 is more than twice the amount of water ejected from the ejection pipe 28. That is, the amount of sewage discharged from the first discharge unit 26 to the drain pipe 12 is sufficiently secured. Further, since the amount of sewage ejected from the ejection pipe 28 via the second discharge portion 27 is 10 to 50% of the amount of sewage discharged from the first discharge portion 26, the sewage tank is swirled. It is possible to stir the stored water of 1. As described above, in the submersible pump device 20, scum and the like can be appropriately discharged from the sewage tank 1 in a state where the amount of discharged water of the pump main body 21 is sufficiently secured.

Further, in the submersible pump device 20, since each of the first discharge portion 26 and the second discharge portion 27 is provided in the pump casing 23, the configuration of the pump main body 21 can be simplified. Further, the second discharge unit 27 is arranged at a position away from the first discharge unit 26 on the upstream side, and is formed along the second direction B in which the angle formed by the first direction A is an acute angle in a plan view. Therefore, a part of the sewage flowing in the pump chamber 24 (clockwise inside the pump chamber 24) can be vigorously discharged from the second discharge portion 27. As a result, the stored water in the sewage tank 1 is sufficiently agitated by the swirling flow, and scum and the like can be discharged from the sewage tank 1.

[Second Embodiment]
7 and 8 show the submersible pump device 20 and the submersible pump system 10 according to the second embodiment of the present disclosure. In the second embodiment, the positions of the second discharge portion 27 and the ejection pipe 28 and the shape of the ejection pipe 28 are different from those in the first embodiment. The other configurations of the submersible pump device 20 and the submersible pump system 10 according to the second embodiment are the same as the configurations of the submersible pump device 20 and the submersible pump system 10 according to the first embodiment. Therefore, in the following description, the same parts as those in FIGS. 1 to 6 are designated by the same reference numerals, and detailed description thereof will be omitted.

As shown in FIGS. 7 and 8, the pump main body 21 has a connecting pipe 30. The connecting pipe 30 is for detachably connecting the first discharge portion 26 and the first drain pipe 12a. One end of the connecting pipe 30 is connected to the first discharge portion 26. The other end of the connecting pipe 30 is connected to the first drain pipe 12a.

The second discharge portion 27 is provided in the connecting pipe 30. Specifically, the second discharge portion 27 is integrally formed with the connecting pipe 30. Further, the second discharge portion 27 projects in a tubular shape (substantially cylindrical shape) from the side portion on the left side of the paper surface in the middle portion of the connecting pipe 30 shown in FIG. 8 toward the second direction B. Here, in the second embodiment, the angle formed by the first direction A and the second direction B is configured to be about 90 ° in a plan view. Specifically, the second direction B extends toward the left side of the paper in FIG.

The ejection pipe 28 is joined to the tip of the second discharge portion 27 by, for example, welding. The ejection pipe 28 is formed in a non-linear shape. Specifically, the ejection pipe 28 is formed in a curved shape so as to go in a direction parallel to the first direction A from the tip end portion of the second discharge portion 27. That is, in the second embodiment, in the ejection pipe 28, the sewage diverted from the connecting pipe 30 to the second discharge portion 27 is ejected in a direction parallel to the first direction A or in a direction along the inner surface of the sewage tank 1. It is configured to be.

[Action and effect of the second embodiment]
As described above, in the submersible pump device 20 according to the second embodiment, since the second discharge portion 27 is provided in the connecting pipe 30 constituting the pump main body 21, the connecting pipe is provided via the first discharging portion 26. A part of the sewage flowing through the 30 can be efficiently discharged from the ejection pipe 28 via the second discharge portion 27. Therefore, the stored water in the sewage tank 1 is sufficiently agitated by the swirling flow, and scum and the like can be appropriately discharged from the sewage tank 1. Further, since the connecting pipe 30 is detachable from the first discharge portion 26 and the first drain pipe 12a of the sewage tank 1, it can be attached to at least one of the second discharge portion 27 and the ejection pipe 28. Even if a problem occurs, the maintenance work can be completed simply by replacing the connecting pipe 30. That is, in the submersible pump device 20 according to the second embodiment, the maintainability of the pump main body 21 can be improved.

Further, for the submersible pump device 20 in which the second discharge portion 27 is not integrally provided in the pump casing 23, the second discharge portion 27 is added only by adding the connecting portion 30 without modifying the pump main body 21. can do.

Further, in the submersible pump device 20 according to the second embodiment, since the ejection pipe 28 is formed in a non-linear manner, for example, the ejection direction of the sewage ejected from the ejection pipe 28 is the surface direction of the wall surface in the sewage tank 1. It will be easier to follow. As a result, a swirling flow is likely to occur in the stored water of the sewage tank 1, the stored water of the sewage tank 1 is sufficiently agitated, and scum and the like can be appropriately discharged from the sewage tank 1.

[Other Embodiments]
In the first embodiment, the ejection pipe 28 is formed in a straight shape, but the present invention is not limited to this embodiment. For example, the straight-shaped ejection pipe 28 may be replaced with a non-linearly formed ejection pipe 28.

Further, in the first embodiment, the second discharge portion 27 is arranged at a position corresponding to substantially the center of the pump casing 23 in the vertical direction, but the present invention is not limited to this form. For example, the second discharge portion 27 may be arranged below the substantially center of the pump casing 23 in the vertical direction (that is, on the bottom 5 side of the sewage tank 1). As a result, the swirling flow easily acts on the bottom 5 of the sewage tank 1, and sand, sludge, suspended oil, scum, etc. accumulated on the bottom 5 of the sewage tank 1 are discharged in the sewage tank 1 by the swirling flow. It is rolled up. As a result, the scum or the like accumulated on the bottom 5 can be appropriately discharged from the sewage tank 1.

Further, in each of the above embodiments, the openings of the first discharge unit 26, the second discharge unit 27, and the ejection pipe 28 are substantially circular, but the present invention is not limited to this form. For example, each opening may be formed in a polygonal shape.

Further, in each of the above embodiments, the form in which the second discharge portion 27 is formed in a tubular shape is shown, but the present invention is not limited to this form. For example, the second discharge portion 27 shown in the first embodiment may be a hole portion (not shown) provided on the side surface of the pump casing 23. Further, the second discharge portion 27 shown in the second embodiment may be a hole portion (not shown) provided on the side surface of the connecting pipe 30.

Further, in each of the above embodiments, the opening in the ejection pipe 28 has substantially the same size as the diameter D2 of the opening in the second discharge portion 27, but the present invention is not limited to this embodiment. That is, the opening of the ejection pipe 28 may be formed to have a size different from the diameter D2 of the opening in the second discharge portion 27.

Although the embodiments of the present disclosure have been described above, the present disclosure is not limited to the above-described embodiments, and various modifications can be made within the scope of the invention.

The present disclosure can be industrially used, for example, as a submersible pump device installed in a sewage tank.

1: Sewage tank 2: Manhole 10: Submersible pump system 12: Discharge pipe 20: Submersible pump device 21: Pump body 22: Electric motor 23: Pump casing 24: Pump chamber 25: Suction part 26: First discharge part 27: No. 2 Discharge part 28: Ejection pipe 29: Nut part 30: Connecting pipe A: First direction B: Second direction

Claims (6)

A submersible pump device equipped with a pump body installed in a sewage tank.
The pump body
A suction unit for sucking the stored water in the sewage tank into the pump body,
A first discharge unit for discharging the sewage sucked into the pump body along the first direction toward the drain pipe installed in the sewage tank.
A second discharge unit located in the vicinity of the first discharge unit and for discharging a part of the sewage sucked into the pump body along a second direction different from the first direction. Have and
The second discharge portion is configured so that the opening area of the flow path is smaller than the opening area of the flow path in the first discharge portion.
The flow path of the second discharge portion is always open.
A tubular ejection pipe protruding outward from the pump body is connected to the second discharge portion.
The ejection pipe is a submersible pump device configured to generate a swirling flow in the stored water of the sewage tank by the sewage ejected into the sewage tank through the second discharge portion. In the submersible pump device according to claim 1,
A submersible pump device configured such that the amount of sewage ejected from the ejection pipe is 10 to 50% of the amount of sewage discharged from the first discharge portion. In the submersible pump device according to claim 1 or 2.
The pump body has a pump casing provided with a pump chamber.
Each of the first discharge portion and the second discharge portion is provided in the pump casing.
The second discharge portion is arranged at a position away from the first discharge portion on the upstream side in the flow of sewage flowing into the pump chamber.
The submersible pump device is configured such that the angle formed by the second direction with the first direction is an acute angle in a plan view. In the submersible pump device according to claim 1 or 2.
The pump main body has a connecting pipe for detachably connecting the first discharge portion and the drain pipe.
The second discharge unit is a submersible pump device provided in the connecting pipe. In the submersible pump device according to any one of claims 1 to 4.
The submersible pump device in which the ejection pipe is formed in a non-linear manner. A submersible pump system including the submersible pump device according to any one of claims 1 to 5.

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