JP2024055922A - Submersible pump device and submersible pump system using the same - Google Patents

Abstract

[Problem] To improve the operating efficiency of a submersible pump device and properly discharge scum and the like from a sewage tank while ensuring a sufficient amount of discharged water from the pump body. [Solution] A pump body 21 has a first discharge section 26 that discharges sewage sucked into the pump body 21 into a drain pipe 12, and a second discharge section 27 that discharges a portion of the sewage. The opening area of the flow path in the second discharge section 27 is smaller than the opening area of the flow path in the first discharge section 26. The flow path in the second discharge section 27 is always open. The pump body 21 is provided with an ejection pipe 28 connected to the second discharge section 27. The ejection pipe 28 is configured to generate a swirling flow in the water stored in the sewage tank 1 by the sewage ejected into the sewage tank 1 via the second discharge section 27. [Selected Figure] Figure 3

Description

This disclosure relates to an underwater pump device and an underwater pump system using the same.

Conventionally, as a submersible pump device to be installed in a sewage tank, a submersible pump device equipped with an agitator in the pump tank, such as that disclosed in Patent Document 1, has been proposed.

This patent document 1 discloses a submersible pump device that includes a pump body (submersible pump) that is installed in a sewage tank, and a pump tank agitator that is attached to the pump body and discharges a part or all of the jet from the pump body into the tank for a fixed period of time when the pump body starts operating, thereby agitating the inside of the sewage tank.

The pump body is provided with a pump casing having a pump chamber that houses an impeller. The pump casing is provided with a pump discharge port for discharging the wastewater sucked into the pump body into a drainage pipe installed in the wastewater tank, and a jet discharge port for discharging a jet into the agitator in the pump tank.

The pump tank agitator includes a casing with an inlet and a discharge opening on the side wall facing each other and a valve housing section inside communicating with the inlet and discharge sections, a valve seat provided at the upstream end opening located on the valve housing section side of the discharge section, a diaphragm provided at the bottom of the valve housing section, and a ball valve movably housed in the valve housing section. In this pump tank agitator, when the valve is open, the ball valve is located at the bottom of the valve housing section with the ball valve resting on the diaphragm, and when the valve is closed, the negative pressure generated in the valve housing section biases the diaphragm upward, causing the ball valve to seat on the valve seat and close the discharge section.

Then, for a certain period of time after the underwater pump device starts operating (operating), the jet from the pump body is discharged from the discharge part into the wastewater tank via the agitator in the pump tank, which is in an open state. In addition, the jet from the agitator in the pump tank is stopped by closing the valve of the agitator in the pump tank after the valve is kept open for a certain period of time.

Patent No. 4919389

In the underwater pump device of Patent Document 1, a jet from the pump body is discharged from the discharge part into the sewage tank via the pump tank agitator, which is in an open state. This agitates the water stored in the sewage tank, and sand, sludge, floating oil, scum, etc. that have accumulated or stayed in the sewage tank are sucked into the pump body and then discharged from the drain pipe through the pump discharge port to the outside of the sewage tank. As a result, sand and sludge are prevented from staying or accumulating in the sewage tank, and floating oil and scum are prevented from adhering to the walls of the sewage tank, etc.

However, the internal structure of the pump tank agitator for opening and closing the valve is complex, and for example, the discharge section can be blocked instantly by a ball valve, or the blocked state can continue for a long time. To prevent such phenomena, regular maintenance is required to check whether the pump tank agitator is operating properly. In addition, if foreign matter in the sewage tank gets into the pump tank agitator, the foreign matter can block the valve seat, and in such cases, work must be done to remove the foreign matter. Thus, with the submersible pump device of Patent Document 1, regular maintenance must be frequently performed to keep the pump tank agitator running, which can reduce the operating efficiency of the submersible pump device.

This disclosure has been made in consideration of these points, and its purpose is to improve the operating efficiency of a submersible pump device while ensuring a sufficient amount of water discharged from the pump body, and to properly discharge scum and the like from the sewage tank.

To achieve the above objective, in the conventional configuration in which a portion of the sewage sucked into a submersible pump is sprayed into a sewage tank to generate a swirling flow (the configuration relating to the submersible pump device of Patent Document 1), the spray time is limited to prevent problems in draining the sewage. However, the present inventors have discovered that by appropriately designing the second discharge section, which is a component relating to the first embodiment of the present disclosure, it is possible to achieve both drainage of sewage and generation of a swirling flow without limiting the spray time, and to eliminate the problems caused by the conventional configuration that limits the spray time.

Specifically, in the first embodiment of the present disclosure, the underwater pump device includes a pump body installed in a sewage tank, and the pump body has a suction section for sucking the sewage tank stored water into the pump body, a first discharge section for discharging the sewage sucked into the pump body along a first direction toward a drain pipe installed in the sewage tank, and a second discharge section located near the first discharge section and for discharging a portion of the sewage sucked into the pump body along a second direction different from the first direction. The second discharge section 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 section. The flow path of the second discharge section is always open. A tubular ejection pipe protruding outward from the pump body is connected to the second discharge section. The ejection pipe is configured so that the sewage ejected into the sewage tank through the second ejection section generates a swirling flow in the stored water in the sewage tank. The ejection pipe is configured by a first protruding pipe formed in a straight shape or a second protruding pipe formed in a non-linear shape. The second discharge section is configured so that the first protruding tube and the second protruding tube are mutually interchangeable.

In the first embodiment, the second discharge section 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 section. With this configuration, the amount of sewage discharged from the first discharge section to the drain pipe (discharge water amount) can be made greater than the amount of sewage sprayed from the ejection pipe into the sewage tank via the second discharge section. That is, in the first embodiment, the opening of the flow path in the second discharge section is appropriately set, thereby ensuring a sufficient amount of sewage to be discharged from the first discharge section to the drain pipe.

The tubular ejection pipe is also connected to a second discharge section whose flow path is always open. That is, in the first embodiment, the structure for stirring the stored water in the sewage tank is simplified. This eliminates the need for a complex structure for opening and closing the valve, as in conventional pump tank stirring devices. As a result, frequent periodic maintenance is no longer necessary, improving the operating efficiency of the underwater pump device.

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 through the second ejection section. With this 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 ejection section whose flow path is constantly open. This swirling flow stirs the stored water of the sewage tank, and sand, sludge, floating oil and scum, etc. that are retained or accumulated in the sewage tank are sucked into the pump body and then discharged from the drain pipe to the outside of the sewage tank through the first ejection section. As a result, sand and sludge are prevented from retaining or accumulating in the sewage tank, and the floating oil and scum are prevented from adhering to the walls of the sewage tank, etc.

Therefore, in the first embodiment, while ensuring a sufficient discharge volume of water from the pump body, the operating efficiency of the submersible pump device can be improved and scum and the like can be properly discharged from the sewage tank.

The second embodiment is characterized in that in the first embodiment, the amount of wastewater ejected from the ejection pipe is configured to be 10 to 50% of the amount of wastewater ejected from the first ejection section.

In this second embodiment, the amount of water discharged from the first discharge section is more than twice the amount of water sprayed from the spray pipe. In other words, a sufficient amount of sewage is discharged from the first discharge section into the drain pipe. In addition, the amount of sewage sprayed from the spray pipe via the second discharge section is 10 to 50% of the amount of sewage discharged from the first discharge section, so it is possible to agitate the water stored in the sewage tank by using a swirling flow. In this way, in the second embodiment, scum and the like can be properly discharged from the sewage tank while a sufficient amount of water is discharged from the pump body.

The third embodiment is an underwater pump system that includes an underwater pump device according to either the first or second embodiment.

In this third embodiment, it is possible to obtain an underwater pump system that provides the same effects as the first or second embodiment.

As described above, according to the present disclosure, it is possible to improve the operating efficiency of the submersible pump device while ensuring a sufficient amount of water discharged from the pump body, and to properly discharge scum and the like from the sewage tank.

FIG. 1 is a cross-sectional view that shows a schematic overall configuration of a sewage tank in which a submersible pump device and a submersible pump system using the same according to a first embodiment of the present disclosure are installed. FIG. 2 is a side view, with some parts omitted, showing the submersible pump device according to the first embodiment of the present disclosure installed in a sewage tank. FIG. 3 is a plan view of the underwater pump device according to the first embodiment of the present disclosure. FIG. 4 is a cross-sectional view taken along line IV-IV in FIG. FIG. 5 is a cross-sectional view taken along line VV in FIG. FIG. 6 is a cross-sectional view taken along line VI-VI in FIG. FIG. 7 is a view equivalent to FIG. 2 of a submersible pump device according to a reference embodiment. FIG. 8 is a plan view of a submersible pump device according to a reference embodiment.

Each embodiment of the present disclosure will be described in detail below with reference to the drawings. The following description of each embodiment is merely exemplary in nature and is not intended to limit the present disclosure, its applications, or its uses.

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

(Sewage tank)
As shown in Figure 1, the sewage tank 1 is provided with a manhole 2 having a lid 3 and an inlet 4. When the water level in the sewage tank 1 reaches or exceeds a predetermined operating level, the sewage that flows into the sewage tank 1 from the inlet 4 is sucked into the submersible pump device 20 by the operation of the submersible pump device 20 until the water level falls to a predetermined stop level, and then is discharged from a drain pipe 12 described below.

(Submersible pump system)
As shown in Figure 1, the underwater pump system 10 mainly comprises a lifting chain 11, a drain pipe 12, a detachable part 13, a guide pipe 14, a control panel 15, float switches 16, 16, ..., and a underwater pump device 20.

The lifting chain 11 is used to raise and lower the submersible pump device 20, and is provided inside the sewage tank 1. The upper end of the lifting chain 11 is connected to the cover 3 of the manhole 2, while the lower end is configured to be 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 disposed in a position opposite the inlet 4 in the sewage tank 1. The drain pipe 12 includes first to fourth drain pipes 12a to 12d.

One end of the first drain pipe 12a is connected to the first discharge section 26 of the underwater pump device 20 by the detachable section 13, which will be described later. 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 drain pipe 12a is provided with a support portion 12e for supporting the drain pipe 12 on 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 pipes 14 extend vertically from the manhole 2 to the first drain pipe 12a within the sewage tank 1. Specifically, the upper end of each guide pipe 14 is attached to the inner wall surface of the manhole 2, while the lower end is connected to the middle of the first drain pipe 12a. Although not shown, in this embodiment, two guide pipes 14 are provided in a pair on the left and right in parallel.

The control panel 15 and float switches 16, 16, ... are used to control the operation of the submersible pump device 20. The control panel 15 is disposed above the manhole 2 and is electrically connected to the submersible pump device 20. The float switches 16, 16, ... are disposed in the sewage tank 1 and are electrically connected to the control panel 15. The float switches 16 consist of an abnormal water level alarm float switch 16a, an operation float switch 16b, and a stop float switch 16c.

(Submersible pump device)
As shown in Figures 1 and 2, the submersible pump device 20 is lowered from the manhole 2 of the sewage tank 1 through a guide pipe 14 to the bottom 5 of the sewage tank 1, and is installed in the sewage tank 1 so that it can be attached and detached to the drain pipe 12 by means of the detachable part 13. The submersible pump device 20 has a pump body 21 and an electric motor 22 arranged on an upper part of the pump body 21. The pump body 21 is, for example, a centrifugal pump. The submersible pump device 20 is not provided with a pump tank stirring device as in the prior art.

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

(Suction section)
4 to 6, the pump body 21 has a suction section 25. The suction section 25 is for sucking the stored water (sewage) in the sewage tank 1 into the inside of the pump body 21. The suction section 25 is configured so that it opens approximately in the center of the lower part of the pump casing 23 and communicates with the pump chamber 24.

(First Discharge Section)
As shown in Figures 1 to 5, the pump body 21 has a first discharge section 26. The first discharge section 26 is for discharging sewage sucked into the pump body 21 along a first direction A (see Figures 3 to 5) toward the drain pipe 12 installed in the sewage tank 1. The first discharge section 26 is configured to communicate with the drain pipe 12 when it is coupled to the first drain pipe 12a by the detachable section 13 (see Figure 2).

The first discharge section 26 is provided in the pump casing 23. The first discharge section 26 is integrally formed with the side surface of the pump casing 23. The first discharge section 26 protrudes in a tubular (approximately cylindrical) shape from the side surface of the pump casing 23 in the first direction A. The opening of the first discharge section 26 is formed in a substantially circular shape. The first discharge section 26 is disposed at a position that corresponds to approximately the center of the pump casing 23 in the vertical direction.

(Second Discharge Section)
As shown in Figures 1 to 4 and 6, the pump body 21 has a second discharge section 27. The second discharge section 27 is for discharging a portion of the wastewater sucked into the pump body 21 along a second direction B different from the first direction A. In other words, the submersible pump device 20 is configured to simultaneously discharge the wastewater sucked into the pump chamber 24 in both the first direction A of the first discharge section 26 and the second direction B of the second discharge section 27. Here, the angle between the first direction A and the second direction B is configured to be an acute angle (approximately 45° in the illustrated example) in a plan view.

The second discharge section 27 is formed so that the diameter D2 of its opening is smaller than the diameter D1 of the opening in the first discharge section 26 described above (see Figures 4 to 6). In other words, the flow path of the second discharge section 27 is configured so that its opening area is smaller than the opening area of the flow path in the first discharge section 26. Note that the second discharge section 27 is preferably formed so that the diameter D2 of its opening is, for example, 1/2 or less of the diameter D1 of the opening in the first discharge section 26.

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

The second discharge section 27 is disposed at a position that corresponds to approximately the center in the vertical direction of the pump casing 23. Specifically, the second discharge section 27 is disposed so that the center position in the vertical direction is the same as the center position in the vertical direction of the first discharge section 26.

The second discharge section 27 is disposed near the first discharge section 26 in the pump casing 23. Specifically, the second discharge section 27 is disposed upstream (counterclockwise) away from the first discharge section 26 in the flow of wastewater flowing in a clockwise direction inside the pump chamber 24 (see arrow F in FIG. 4).

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

(Blowout tube)
1 to 3, the pump body 21 is provided with a tubular ejection pipe 28. The ejection pipe 28 protrudes so as to extend in a straight line outward from the pump body 21 (in the second direction B). 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 a size substantially equal to the diameter D2 of the opening of the second discharge portion 27.

As shown in Figures 4 and 6, the ejection pipe 28 is connected to the second ejection section 27. Specifically, the ejection pipe 28 has a connection end 28a with a screw thread formed at one end, and this connection end 28a is connected in a screwed state to a nut portion 29 joined to the second ejection section 27.

The ejection pipe 28 is configured to generate a swirling flow in the stored water in the sewage tank 1 by the sewage ejected into the sewage tank 1 via the second ejection part 27. When the first ejection part 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 ejected from the first ejection part 26.

(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 start the underwater pump device 20, an impeller (not shown) rotates. As the impeller rotates, the stored water (sewage) in the sewage tank 1 is sucked into the pump chamber 24 through the suction port 25 of the pump casing 23 (see Figures 5 and 6).

The sewage sucked into the pump chamber 24 is discharged simultaneously in both the first direction A and the second direction B. Specifically, the sewage sucked into the pump chamber 24 is discharged into the drain pipe 12 through the first discharge section 26 (see Figures 1 and 4). A portion of the sewage sucked into the pump chamber 24 is sprayed from the ejection pipe 28 into the sewage tank 1 via the second discharge section 27 (see Figures 1 and 4). The sewage sprayed from the ejection pipe 28 into the sewage tank 1 generates a swirling flow in the water stored in the sewage tank 1.

[Effects of the First Embodiment]
As described above, in the underwater pump device 20 according to the first embodiment, the second discharge section 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 section 26. With this configuration, the amount of sewage (discharge water amount) discharged from the first discharge section 26 to the drain pipe 12 is adjusted to be greater than the amount of sewage sprayed from the ejection pipe 28 into the sewage tank 1 via the second discharge section 27. In other words, in the underwater pump device 20, the opening of the flow path in the second discharge section 27 is appropriately set, so that a sufficient amount of sewage is ensured to be discharged from the first discharge section 26 to the drain pipe 12.

The tubular ejection pipe 28 is connected to a second discharge section 27 whose flow path is always open. In other words, the submersible pump device 20 has a simplified structure for stirring the stored water in the sewage tank 1. This eliminates the need for a complex structure for opening and closing the valve, as in conventional pump tank stirring devices. As a result, frequent periodic maintenance is no longer necessary, improving the operating efficiency of the submersible pump device 20.

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 through the second ejection part 27. With this 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 ejection part 27, whose flow path is always open. The stored water of the sewage tank 1 is stirred by this swirling flow, and sand, sludge, floating oil and scum, etc. that are retained or accumulated in the sewage tank 1 are sucked into the pump body 21 and then discharged from the drain pipe 12 through the first ejection part 26 to the outside of the sewage tank 1. As a result, sand and sludge are prevented from retaining or accumulating in the sewage tank 1, and the floating oil and scum are prevented from adhering to the wall surface of the sewage tank 1, etc.

Therefore, in the submersible pump device 20 according to the first embodiment, while ensuring a sufficient discharge water volume from the pump body 21, the operating efficiency of the submersible pump device 20 can be improved and scum and the like can be properly discharged from the sewage tank 1.

The amount of sewage sprayed from the ejection pipe 28 is configured to be 10 to 50% of the amount of sewage sprayed from the first ejection section 26. With this configuration, the amount of water sprayed from the first ejection section 26 is more than twice the amount of water sprayed from the ejection pipe 28. In other words, the amount of sewage sprayed from the first ejection section 26 to the drain pipe 12 is sufficiently secured. In addition, since the amount of sewage sprayed from the ejection pipe 28 via the second ejection section 27 is 10 to 50% of the amount of sewage sprayed from the first ejection section 26, it is possible to stir the stored water in the sewage tank 1 by the swirling flow. In this way, the underwater pump device 20 can properly discharge scum and the like from the sewage tank 1 while the amount of water sprayed from the pump body 21 is sufficiently secured.

In addition, in the underwater pump device 20, the first discharge section 26 and the second discharge section 27 are each provided in the pump casing 23, so that the configuration of the pump body 21 can be simplified. Furthermore, the second discharge section 27 is disposed at a position upstream from the first discharge section 26 and is aligned along the second direction B, which forms an acute angle with the first direction A in a plan view, so that a portion of the sewage flowing in the pump chamber 24 (clockwise direction inside the pump chamber 24) can be forcefully discharged from the second discharge section 27. As a result, the swirling flow sufficiently stirs the stored water in the sewage tank 1, and scum and the like can be discharged from the sewage tank 1.

[Reference embodiment]
7 and 8 show a submersible pump device 20 and a submersible pump system 10 according to a reference embodiment. In the reference embodiment, the positions of the second discharge section 27 and the ejection pipe 28 and the shape of the ejection pipe 28 are different from those of the first embodiment. Other configurations of the submersible pump device 20 and the submersible pump system 10 according to the reference embodiment are similar to those of the submersible pump device 20 and the submersible pump system 10 according to the first embodiment. For this reason, in the following description, the same parts as those in FIGS. 1 to 6 are denoted by the same reference symbols, and detailed description thereof will be omitted.

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

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

The ejection pipe 28 is joined to the tip of the second discharge section 27, for example, by 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 extend from the tip of the second discharge section 27 in a direction parallel to the first direction A. That is, in the reference embodiment, the ejection pipe 28 is configured so that the sewage diverted from the connecting pipe 30 to the second discharge section 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.

[Effects of the Reference Embodiment]
As described above, in the submersible pump device 20 according to the reference embodiment, the second discharge part 27 is provided in the connecting pipe 30 constituting the pump body 21, so that a part of the sewage flowing into the connecting pipe 30 through the first discharge part 26 can be efficiently discharged from the ejection pipe 28 through the second discharge part 27. Therefore, the stored water in the sewage tank 1 is sufficiently stirred by the swirling flow, and scum and the like can be appropriately discharged from the sewage tank 1. In addition, since the connecting pipe 30 is detachable from the first discharge part 26 and the first drain pipe 12a of the sewage tank 1, even if a malfunction occurs in at least one of the second discharge part 27 and the ejection pipe 28, the maintenance work can be completed by simply replacing the connecting pipe 30. That is, in the submersible pump device 20 according to the reference embodiment, the maintainability of the pump body 21 can be improved.

Furthermore, for a submersible pump device 20 in which the second discharge section 27 is not integrally provided with the pump casing 23, the second discharge section 27 can be added simply by adding a connecting section 30 without modifying the pump body 21.

In addition, in the underwater pump device 20 according to the reference embodiment, the ejection pipe 28 is formed in a non-linear shape, so that, for example, the ejection direction of the sewage ejected from the ejection pipe 28 can be easily aligned with the surface direction of the wall surface of the sewage tank 1. As a result, a swirling flow is easily generated in the stored water in the sewage tank 1, and the stored water in the sewage tank 1 is sufficiently agitated, allowing scum and the like to be properly 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. For example, the ejection pipe 28 formed in a straight shape may be replaced with an ejection pipe 28 formed in a non-linear shape.

In the first embodiment, the second discharge section 27 is disposed at a position corresponding to approximately the center of the pump casing 23 in the vertical direction, but this is not limited to the above. For example, the second discharge section 27 may be disposed below approximately the center of the pump casing 23 in the vertical direction (i.e., toward the bottom 5 of the sewage tank 1). This makes it easier for the swirling flow to act on the bottom 5 of the sewage tank 1, and sand, sludge, floating oil and grease, scum, etc. that have accumulated on the bottom 5 of the sewage tank 1 are stirred up within the sewage tank 1 by the swirling flow. As a result, the scum, etc. that have accumulated on the bottom 5 can be properly discharged from the sewage tank 1.

In addition, in each of the above embodiments, the openings of the first discharge section 26, the second discharge section 27, and the ejection pipe 28 are shown to be substantially circular, but this is not limited to the above. For example, each opening may be formed into a polygonal shape.

In addition, in each of the above embodiments, the second discharge section 27 is formed in a cylindrical shape, but this is not limited to this. For example, the second discharge section 27 shown in the first embodiment may be a hole (not shown) provided in the side of the pump casing 23. Also, the second discharge section 27 shown in the reference embodiment may be a hole (not shown) provided in the side of the connecting pipe 30.

In addition, in each of the above embodiments, the opening of the ejection pipe 28 is approximately the same size as the diameter D2 of the opening of the second ejection section 27, but this is not limited to this. In other words, the opening of the ejection pipe 28 may be formed to a size different from the diameter D2 of the opening of the second ejection section 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 are possible within the scope of the invention.

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

1: Sewage tank 2: Manhole 10: Underwater pump system 12: Discharge pipe 20: Underwater pump device 21: Pump body 22: Electric motor 23: Pump casing 24: Pump chamber 25: Suction section 26: First discharge section 27: Second discharge section 28: Jet pipe 29: Nut section 30: Connecting pipe A: First direction B: Second direction

Claims (3)

A submersible pump device having a pump body installed in a sewage tank,
The pump body includes:
A suction portion for sucking the stored water in the sewage tank into the inside of the pump body;
a first discharge portion for discharging the sewage sucked into the pump body along a first direction toward a drain pipe installed in the sewage tank;
a second discharge portion located near the first discharge portion and configured to discharge a portion of the wastewater sucked into the pump body along a second direction different from the first direction;
the second discharge portion is configured such that an opening area of a flow path is smaller than an opening area of a 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 ejection portion,
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 through the second ejection portion,
The ejection pipe is composed of a first protruding pipe formed in a straight shape or a second protruding pipe formed in a non-straight shape,
An underwater pump device, wherein the second discharge portion is configured so that the first protrusion pipe and the second protrusion pipe are mutually replaceable. 2. The submersible pump device according to claim 1,
An underwater pump device configured so that the amount of sewage sprayed from the spray pipe is 10 to 50% of the amount of sewage sprayed from the first discharge section. An underwater pump system comprising the underwater pump device according to claim 1 or 2.

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