JP2002339892A - Underground based pump unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an underground based pump unit to be set on the way of a conduit for rainwater, etc., for discharging water from an outflow pipe on the discharge side to a river, etc. SOLUTION: A concrete tank 3 to which a short pipe 4 on the inflow side and a discharge pipe 5 are connected is manufactured, and the concrete tank 3 is buried underground. The short pipe 4 on the inflow side and the discharge pipe 5 of the concrete tank 3 are jointed with an inflow pipe 6 communicating with a conduit 1 such as a storm sewer and an outflow pipe 7 communicating with a river A, etc. Blocks 8a are stacked on top of the concrete tank 3 to make a manhole 8, and a detachable horizontal shaft submerged pump 9 is disposed in the concrete tank 3. The pump unit can be set up only in a period of time for the assembly on the spot, so that the construction period can be reduced. In addition, as it is not necessary to obtain a wide site for the pump unit, the pump unit is applicable to a pump facility which needs the pump urgently. Further, the horizontal shaft submerged pump can be lifted up on the ground and installed on a detachable device, so that the inspection and repair on the ground are possible.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an underground pump unit in which a relay pump unit is installed in the middle of a pipeline for rainwater or sewage and drains from a discharge pipe on the discharge side to a river or another pipeline. .

[0002]

2. Description of the Related Art In recent years, in urban areas, it has become difficult to provide drainage channels and water tanks for flood control on the ground due to the tendency to be dense. Therefore, as one of urgent measures against rainwater exceeding the drainage capacity of urban areas, storage and bypass of pipelines are being studied. An underground pumping station, which is constructed near the beach on the downstream side and discharges water during rainfall from the pipeline to the sea by an underground pump, is disclosed in, for example, JP-A-6-73.
It is known as described in JP 778. Also,
A device in which a pump installed in an underground pumping station is a detachable submersible pump is well known, for example, as described in JP-A-7-269499. Further, a swing gate provided with a submersible pump is provided in a waterway connecting two rivers and the like, and a swing gate that rotates the swing gate 180 degrees left and right to switch the direction of water flow of drainage is also disclosed in, for example, JP-A-2000-199218. Proposed by the applicant of the present invention.

[0003]

The concrete tank of the conventional underground pump unit requires on-site rebar, formwork, concrete placement, and formwork removal, which requires long-term site work. Needed a lot of land.
In addition, the detachable submersible pump installed at the underground pumping station,
Since the installation and removal device and the discharge pipe were installed on site, the construction period was long, and the discharge pipe stood up, requiring a long piping distance. And in the swing type gate pump,
A large installation area must be secured for switching on the ground surface using two waterways, and in urban areas where large land acquisition is difficult, it is not suitable for underground pumping stations that require urgent construction. The present invention relates to a reinforced concrete water tank that is underground type and has less restrictions on the installation place, shortens the construction period of the pump unit site, and flows into a pipe with a sufficient outflow capacity according to the water levels of a plurality of pipes. It is an object of the present invention to provide an underground pump unit capable of switching directions.

[0004]

The gist of the present invention is that a pump unit is installed in an inflow pipe branched from a pipeline for rainwater or sewage, and drainage is performed from an outflow pipe on a discharge side to a river or another pipeline. In a relay pump, a concrete tank connecting the short pipe on the inflow side and the discharge pipe is manufactured at the factory, this concrete tank is buried underground at the installation location, and the inflow pipe communicating with the pipeline and the river etc. The short pipe on the inflow side of the concrete tank and the discharge pipe are joined to the outflow pipe, and blocks are stacked on top of the concrete tank to form manholes. The upper wall and the upper end of the manhole on the ground surface are provided with an opening for the horizontal axis submersible pump, which can be installed only on-site assembly time, shortening the construction period. Without the need for land acquisition, it can be adapted to pump facility that requires urgency. Since the horizontal axis submersible pump is used as the pump disposed in the concrete tank, the natural flow can be caused by the water level difference in the pipeline. If an overflow wall with a screen stretched in the pipeline is provided, an overflow chamber is formed inside the overflow bank, and this overflow chamber is communicated with the concrete tank, the dust and the like can be found in the pipeline. Foreign matter is removed, the pump unit for transferring the waste water becomes smaller, and the installation space is reduced.

A horizontal axis submersible pump installed in a concrete tank is provided with a detachable hook on the horizontal axis submersible pump, and the detachable hook is engaged with an attaching / detaching device provided on a discharge pipe. When the bottom of the horizontal axis submersible pump that is locked by the detachable device is supported, the weight of the pump is shared and supported by the discharge pipe with the detachable device, and the installation work of the pump equipment is short. Can be constructed with Then, the horizontal axis submersible pump can be lifted to the ground from the manhole on the ground surface and the opening of the ceiling wall of the concrete tank, and installed on a detachable device, and inspection and repair on the ground can be performed. In addition, if a rotary drive device is installed on the horizontal axis submersible pump, and the short pipe and discharge pipe on the inflow side of the concrete tank are connected to the suction port and discharge port of the horizontal axis submersible pump in a freely switchable manner, The direction of drainage can be changed by switching between the suction side pipe and the discharge side pipe of the horizontal shaft submersible pump according to or as necessary, and it can be applied to pumps with relatively small diameter, The installation area is small.

A specific structure of a pump unit for switching a flow direction of drainage is that a cylindrical casing connected to a short pipe and a discharge pipe on the inflow side of a concrete tank is provided in the concrete tank, and the cylindrical casing is disposed on a central axis of the cylindrical casing. Even if a rotary drive device is installed on the suspended horizontal axis submersible pump, or a concrete tank is formed in a cylindrical shape, and a pump gate supporting the horizontal axis submersible pump is installed in this concrete tank, and this pump gate is installed. A rotary drive device may be provided. If the concrete tank is cylindrical, the construction resistance can be used as an underground pumping station while maintaining the shape of the pipe construction work, thereby reducing the construction cost. Then, a plurality of pipelines are connected to a concrete tank formed in a cylindrical shape, a plurality of horizontal shaft submersible pumps are supported on a rotatable pump gate, and the inflow from the plurality of pipelines is performed by rotating the pump gate. Outflow control becomes possible. If the support member such as the rotary drive device is removed, the horizontal shaft submersible pump and the pump gate can be integrally taken out to the ground.

The rotary drive of the horizontal shaft submersible pump may be a hydraulic motor and a submersible speed reducer, or a submersible electric motor and a submersible speed reducer. If a hydraulic motor is used for the rotary drive, a hydraulic pressure accumulator can be interposed between the hydraulic motor and the hydraulic pump unit. The rotary drive of the submersible pump becomes possible, and the natural flow between the pipelines becomes possible. And if an electric motor is used for the rotary drive,
The rotary drive is smaller. In addition, if the submersible motor of the detachable horizontal axis submersible pump and the horizontal axis submersible pump supported by the pump gate is a variable speed motor and the water level of the concrete tank on the suction side is maintained at a predetermined water level, the water level can be controlled. The internal volume of the pump unit can be reduced by operation.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An underground pump unit according to the present invention is constructed as described above, and when a concrete tank is poured, a short pipe on the inflow side having a connection portion and a discharge pipe on the outflow side are connected to the water tank. A reinforced concrete circular or rectangular concrete tank is manufactured at the factory and transported to the installation site. A circular or rectangular concrete tank is buried by using the work as a stand for the construction of the inflow pipe communicating with the pipe and the outflow pipe communicating with the river and other pipes. And the discharge pipe are connected to an inflow pipe from a pipeline and an outflow pipe to a river or the like, respectively. Next, a manhole is constructed by stacking a circular or rectangular concrete block manufactured at the factory to the ground surface on the upper part of the concrete tank, and a manhole is constructed from the ground surface. This pump unit can be installed only in on-site assembly time, and installation work of the pump equipment can be performed in a short time. And this underground installation type pump unit can be used as an underground pumping station with the working resistance in its shape, so that the construction cost is reduced.

If the horizontal axis submersible pump installed in the concrete tank is of a detachable type, the horizontal axis submersible pump is mounted on a detachable device provided on the discharge pipe in the water tank from the ground, and rainwater or the like is conveyed from the pipe on the suction side to the concrete. Flow into the tank and store to the required water level,
Drainage operation is performed by the horizontal axis submersible pump, and the water is discharged from the discharge pipe on the discharge side to a river or the like. When the rainwater or the like suddenly flows into the pipeline having a sufficient storage capacity, the concrete tank is formed into a cylindrical shape when the pipeline is to be stored or bypassed to a river or the like. If the horizontal axis submersible pump equipped with is installed in the concrete tank, the horizontal axis submersible pump is rotated according to the amount of water in the pipeline or as necessary, and the flow direction of the pipeline system is switched, and rainwater etc. Is returned. Since rainwater and the like can flow down by effectively using a plurality of pipelines, during localized heavy rainfall, water can be supplied to a spare pipeline to prevent the rainwater from concentrating on the pipeline.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail with reference to the drawings. First, FIG. A pump unit 2 is provided. The concrete tank 3 of the pump unit 2 is manufactured at a factory and is made of a circular or rectangular reinforced concrete.
The discharge pipe 5 on the outflow side is embedded in the concrete tank 3. And the concrete tank 3 transported to the installation location
Is buried by using a work resistance as a stand for pipe construction, and the short pipe 4 and the discharge pipe 5 of the concrete tank 3 are connected to the inflow pipe 6 from the pipe 1 and the outflow pipe 7 to the river A. Each is connected. The concrete block 8a is manufactured at a factory, and the blocks 8a are stacked on the upper part of the concrete tank 3 and installed to the ground surface GL to form the manhole 8. The concrete tank 3 and the manhole 8 are used as underground pumping stations so that the working resistance can be used as it is, so that the construction cost can be reduced. A detachable horizontal axis submersible pump 9 is provided in the concrete tank 3, and openings 10 and 11 through which the horizontal axis submersible pump 9 can be inserted and removed are provided on the top wall 3a of the concrete tank 3 and the upper end 8b of the manhole 8 on the ground surface. Is provided so that it can be inserted into the interior from the ground surface for inspection. This underground installation type pump unit can be installed only in on-site assembly time, and installation work of the pump equipment can be performed in a short time.

FIG. 2 shows a detachable horizontal shaft submersible pump. The horizontal shaft submersible pump 9 has an axial-flow type impeller 13 disposed in a cylindrical suction casing 12, and the impeller 13 is fixed thereto. The main shaft 14 is connected to a variable speed motor 15. A cylindrical motor casing 16 is connected to the rear end of the suction casing 12, and a variable speed motor 15 is supported by guide vanes 17 fixed to the inner peripheral surface of the motor casing 16. In the embodiment of the present invention, the horizontal axis submersible pump 9 includes a guide rod 18a and a projecting holding portion 18b disposed at the upper end of the discharge pipe 5.
A detachable hook 19 provided on the horizontal axis submersible pump 9 is locked to an attaching / detaching device 18 composed of: The horizontal axis submersible pump 9 is hung by a hanging chain 20 and attached to the attaching / detaching device 18 of the discharge pipe 5. is there. A support fitting 21 is provided upright on the bottom of the concrete tank 3. The lower part of the suction casing 12 of the installed horizontal shaft submersible pump 9 is supported, and
It supports the weight of the pump by sharing with the attachment / detachment device 18 at the tip of the pump, and the installation work of the pump equipment can be performed in a short time.

As shown in FIG. 1, a power cable 72 for the horizontal axis submersible pump 9 is connected to the pump operation panel 22 on the ground, and the pump operation panel 22 is provided with a water level provided near the horizontal axis submersible pump 9. It is linked with a total of 23. Then, the water level H of the concrete tub 3 is detected, and the number of rotations of the variable speed motor 15 is controlled so that the water level H of the concrete tub 3 is kept constant. it can. The openings 10 and 11 of the concrete tank 3 and the manhole 8 are closed by watertight opening lids 24 and 25 made of a steel plate except when the horizontal axis submersible pump 9 is detached from the concrete tank 3 or not inspected.

As shown in FIG. 1, an overflow bank 27 having a screen 26 stretched therein is disposed in the pipe 1 at a portion where the inflow pipe 6 branches off, and an overflow chamber 28 is provided inside the overflow bank 27. Is formed. Foreign matter, such as dust, is prevented from entering the overflow chamber 28 together with rainwater and sewage flowing through the pipeline 1. The water removed by the screen 26 is transferred from the overflow chamber 28 to the concrete tank 3.
The dust removal device is not required for the pump unit 2 and the installation space is reduced. In addition,
Reference numeral 29 denotes an air vent pipe from the concrete tank 3 to the ground surface.
Rainwater from the river is easy to flow. Reference numeral 30 denotes a flat valve pivotally connected to the rear end of the outflow pipe 7 so as not to flow backward from the river A on the discharge side having a high water level.

FIG. 3 shows another embodiment of the pump unit in which the horizontal axis submersible pump is rotatable. A cylindrical casing 31 is provided upright inside a circular concrete tank 3 and is disposed in front of and behind the cylindrical casing 31. Are provided with flanges 32 and 33 on the peripheral wall of the housing. The front and rear flanges 32 and 33 of the cylindrical casing 31 are connected to the short pipe 34 on the suction side and the cylindrical discharge pipe 35 on the discharge side of the concrete tank 3 by floating flanges 36 and 37.
It is connected with. A horizontal shaft submersible pump 38 is disposed inside the cylindrical casing 31, and as shown in FIG. 4, a suction port 3 of a cylindrical blade casing 40 having an impeller 39 installed therein.
The open ends of the discharge port 8 a and the discharge port 38 b are curved along the inner peripheral surface of the cylindrical casing 31. An impeller 39 provided inside the blade casing 40 is connected to a submersible motor 41, and the submersible motor 41 is supported by guide vanes 42 and connected to the inner peripheral surface of the blade casing 40. As shown in FIG. 3, a concave bearing 31a is provided at the center of the tank bottom of the cylindrical casing 31.
The support rod 43 provided at the center of the bottom of the blade casing 40 is supported on the bearing 31 a of the cylindrical casing 31. A rotating main shaft 44 fixed to the upper central portion of the blade casing 40 is supported by a cover 45 of the cylindrical casing 31 and connected to a rotation driving device 47. The rotary driving device 47 is supported on an opening cover 46 that covers the upper opening 10 of the concrete tank 3, and drives the rotary driving device 47 to rotate the horizontal shaft submersible pump 38 by 180 degrees along the inner peripheral surface of the cylindrical casing 31. It can be rotated.

FIGS. 5 and 6 show an embodiment of a pump unit in which the rotary drive device shown in FIG. 3 is disposed between two pipes. The pump unit 2a shown in FIG. Is driven to drain rainwater or sewage from the pipe 1a having a large amount of water to the pipe 1b having a small amount of water. For example, when rainwater flows into the discharge-side pipe line 1b due to heavy rain and the amount of rainwater increases, as shown in FIG. 6, the rotation driving device 47 is driven to rotate the horizontal axis submersible pump 38 by 180 degrees. Then, the suction port 38a and the discharge port 38b of the horizontal shaft submersible pump 38 rotated to the discharge pipe 35 on the discharge side and the short pipe 34 on the suction side of the concrete tank 3 are switched to communicate with each other,
Water can be drained from the pipe 1b having a large amount of water to the pipe 1a having a small amount of water. According to the amount of water in the pipelines 1a and 1b,
Alternatively, the flow direction of the pipelines 1a and 1b can be switched as required, and can be applied to a pump having a relatively small diameter.
The installation area is small. Reference numeral 48,
Reference numeral 48a denotes an inflow pipe for rainwater or the like to the pump unit 2a, and reference numerals 49 and 49a indicate outflow pipes for rainwater or the like from the pump unit 2a.

FIG. 7 shows another embodiment of a pump unit provided with a rotary drive device. A short pipe 50 on the suction side and a discharge pipe 51 on the discharge side are provided in a concrete tank 3 having a cylindrical inside. It is buried. A pump gate 52 for separating an inflow side and an outflow side is provided inside the concrete tank 3, and a horizontal shaft submersible pump 53 is supported on the pump gate 52.
A concave bearing 3b is formed at the center of the bottom of the concrete tank 3, and a support rod 54 provided at the center of the bottom of the pump gate 52 is supported by the bearing 3b of the concrete tank 3. A rotation drive device 47 is supported on an opening lid 55 covering the opening 10 in the upper part of the concrete tank 3, and a rotation drive shaft 56 of the rotation drive device 47 is connected to the upper central portion of the pump gate 52. As shown in FIG.
3 is rotatable along the inner peripheral surface of the concrete tub 3, and the rotation driving device 47 is driven to rotate the horizontal axis submersible pump 53 by 180 degrees to discharge the concrete tub 3. Pipe 51 to horizontal axis submersible pump 5
The short pipe 50 on the suction side is communicated with the discharge side of the horizontal shaft submersible pump 53. Then, the direction of the water flow of rainwater or the like is switched, and the pipe
Can be drained to a pipeline 1a with a small amount of water. Reference numeral 57 denotes a flap valve provided on the discharge side of the submersible pump 53 for preventing backflow.

FIG. 9 shows another embodiment of a pump unit in which a pump gate is disposed between a plurality of pipelines. A pair of horizontal shaft submersible pumps 53c and 53 are provided inside a concrete tank 3.
and a pump gate 52a supporting the d. is connected to the concrete tank 3a.
And the discharge pipes 51a and 51b on the discharge side are connected to each other. Since the rainwater or the like can flow down by effectively using the plurality of pipelines 1a, 1b, etc., in the event of a local heavy rain, for example, water is sent to the pipeline 1a, which has a margin, and the rainwater concentrates on the specific pipeline 1b. Driving to avoid doing so becomes possible.

FIG. 10 shows an embodiment of the rotary driving device.
The rotation driving device 47 of the horizontal axis submersible pump 53 is
8 and a submersible speed reducer 59. A hydraulic pump unit 60 for operating the hydraulic motor 58 is installed in an underground pit 61 on the ground surface GL to prevent a flooding cover 62.
The structure is such that even if rainwater enters the underground pit 61, an air pocket protects the hydraulic pump unit 60 from flooding. Inspection and maintenance on the ground is also possible. Then, as shown in FIG. 11, a hydraulic pressure accumulator 65 is provided branching to a hydraulic circuit 58 of a hydraulic motor 58 and a hydraulic pump 63.
When the oil is pressure-fed to 8, the on-off valve 66 provided in the hydraulic pressure accumulator 65 is opened to accumulate high-pressure oil in the hydraulic pressure accumulator 65. Reference numeral 67 denotes a direction switching valve provided in the hydraulic circuit 64, which switches the supply circuit 64 of the hydraulic pressure to the hydraulic motor 58 to rotate the horizontal shaft submersible pump 53 right and left. Reference numeral 68 denotes a pressure regulating valve, and reference numeral 69 denotes an oil tank attached to the hydraulic pump 63.

Then, when a power failure occurs due to lightning or heavy rain, rainwater flows into a specific pipeline 1a, and when the amount of water increases, the on-off valve 6
6 is released to supply high-pressure oil from the hydraulic pressure accumulator 65 to the hydraulic motor 58, and the horizontal axis submersible pump 53 is rotated together with the pump gate 52. If the horizontal axis submersible pump 53 is rotated even if it is not, for example, it is allowed to naturally flow down from the pipes 1b...
Driving to avoid the concentration of rainwater on… becomes possible. Further, if instead of the hydraulic motor 58, the submersible electric motor 70 and the reduction gear 71 are used as the rotary driving device 47 of the horizontal shaft submersible pumps 38 and 53 shown in FIGS. 3 and 7, the rotary driving device becomes small. Things.

[0020]

According to the present invention, since the concrete tank and the block of the manhole are manufactured in the factory as described above, the construction period of the pump unit is shortened, and a large installation site on the site is unnecessary. . That is, the concrete tank of the conventional underground pump unit requires a long-term site construction and a large site for the construction. In addition, the detachable submersible pump requires an underground pump that requires urgent construction in urban areas where the installation time of the detachable device and the discharge pipe is long, the piping distance of the rising discharge pipe is required, and land acquisition is difficult in urban areas. Unsuitable for the venue. According to the present invention, a concrete tank connecting a short pipe on the inflow side and a discharge pipe is manufactured in a factory, buried in the ground at the installation location, and used for inflow pipes communicating with pipelines such as rainwater pipes and rivers. A concrete tank is attached to the outflow pipe that communicates, blocks manufactured at the factory are stacked on top of the concrete tank to form a manhole, and a horizontal axis submersible pump is installed in the concrete tank, which is installed only by on-site assembly work Therefore, the construction period can be shortened, the site does not require a large site for site construction, and it can be applied to a pumping facility that requires urgency.

The pump installed in the concrete tank is a horizontal axis submersible pump, so that it can flow naturally due to the difference in water level in the pipeline. If an overflow chamber with a screen stretched in the pipeline is formed, foreign substances such as dust are removed in the pipeline, the size of the pump unit for transferring drainage is reduced, and the installation space is reduced. In addition, if the horizontal axis submersible pump is detachable, it can be installed from the ground to the detachable device, the installation work of the pump equipment can be completed in a short time, and the horizontal axis submersible pump can be inspected and repaired on the ground It is. If a rotation unit is provided on the horizontal axis submersible pump and the pump unit switches the direction of drainage, the direction of drainage can be changed according to the amount of water in the pipeline, and the installation area is small. It is a thing.

The structure of the pump unit for switching the flow direction of the drainage water can be obtained by disposing a rotary drive device on a horizontal shaft submersible pump supported on a cylindrical casing provided in a concrete tank.
Alternatively, a pump gate supporting a horizontal axis submersible pump may be provided in a concrete tank formed in a cylindrical shape, and a rotary drive device may be provided in this pump gate. The construction work can be used as an underground pumping station with the same shape as the construction stand, which reduces construction costs. By connecting a plurality of pipelines to a concrete tank formed into a cylindrical shape and supporting a plurality of horizontal shaft submersible pumps on a rotatable pump gate, it is possible to control inflow or outflow from the plurality of pipelines. It becomes. If a hydraulic motor is used for the rotary drive of the horizontal axis submersible pump, a hydraulic pressure accumulator can be interposed between the hydraulic motor and the hydraulic pump unit. It moves to allow natural flow. If an electric motor is used for the rotary drive device, the drive device becomes smaller. In addition, if the submersible motor of the horizontal axis submersible pump is a variable speed motor and the water level of the concrete tank on the suction side is maintained at a predetermined water level, the internal volume of the pump unit can be reduced by controlling the water level. is there.

[Brief description of the drawings]

FIG. 1 is an overall view of an underground installation type pump unit in which a pipe and a river according to the present invention communicate with each other.

FIG. 2 is a longitudinal sectional side view of a horizontal axis submersible pump of a main part according to the present invention.

FIG. 3 is a longitudinal sectional side view of an embodiment of an underground installation type pump unit provided with a rotary drive device.

FIG. 4 is a longitudinal sectional front view taken along the line AA in FIG. 3;

5 is a vertical sectional side view of an underground pump unit in which the rotary drive device shown in FIG. 3 is disposed between two pipes.

FIG. 6 is a vertical sectional side view of the underground installation type pump unit of FIG. 5 in which a water flow direction is switched.

FIG. 7 is a vertical sectional side view of another embodiment of a pump unit underground installation provided with a rotary drive device.

8 is a partial cross-sectional plan view of the pump unit shown in FIG.

FIG. 9 is a conceptual diagram showing an example of use of an underground pump unit in which a pump gate is arranged between a plurality of pipelines.

FIG. 10 is a flowchart of a rotary drive device of a horizontal shaft submersible pump using a hydraulic device.

FIG. 11 is a flowchart of an embodiment of a rotary drive device using a hydraulic device.

[Explanation of symbols]

 1, 1a, 1b Pipeline 2 Pump unit 3 Concrete tank 3a Top wall 4, 34, 50 Short pipe 5, 35, 51 Discharge pipe 6 Inflow pipe 7 Outflow pipe 8 Manhole 8a Block 8b Upper end 9, 38, 53, 53c , 53d Horizontal axis submersible pump 10, 11 Opening 15 Variable speed motor 18 Detachment device 19 Detachment hook 21 Support bracket 26 Screen 27 Overflow bank 28 Overflow chamber 31 Cylindrical casing 38a, 53a Suction port 38b, 53b Discharge port 47 Rotary drive device 52, 52a Pump gate 58 Hydraulic motor 59 Reduction gear 60 Hydraulic pump unit 65 Hydraulic pressure accumulator 70 Electric motor 71 Reduction gear

Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat II (Reference) E03F 5/22 E03F 5/22 F03C 1/26 F03C 1/26 F04D 15/00 F04D 15/00 B CD 29/56 29/56 A 29/60 29/60 C 29/70 29/70 GF term (reference) 2D063 AA03 AA05 DA30 DC06 3H020 AA03 AA08 DA04 DA08 DA11 DA13 DA21 3H034 AA03 AA20 BB01 BB08 BB12 CC03 DD26 DD27 EE04 EE05 EE09 EE14 3H035 BB01 BB03 3H084 AA01 AA21 BB25 BB26 BB30 CC46 CC63

Claims (12)

[Claims] A pump unit (2) is installed in an inflow pipe (6) branched from a pipeline (1) for rainwater or sewage,
In a relay pump for draining water from a discharge pipe (7) on the discharge side to a river or another pipe (1b), a concrete tank (3) in which a short pipe (4) on the input side and a discharge pipe (5) are connected.
The concrete tank (3) is buried in the ground, and the concrete tank (3) is connected to the inflow pipe (6) communicating with the pipeline (1) and the outflow pipe (7) communicating with rivers and the like. The short pipe (4) on the inflow side and the discharge pipe (5) are joined together, and a block (8a) is stacked on top of the concrete tank (3) to form a manhole (8). Axial submersible pumps (9, 38, 53) are installed, and the top wall (3a) of the concrete tank (3) and the manhole (8) on the ground surface
Horizontal shaft submersible pump (9, 38, 53)
An underground installation type pump unit characterized by having openings (10, 11) that can be freely inserted and removed. 2. An overflow wall (27) having a screen (26) stretched therein is disposed in the pipe (1), and an overflow chamber (28) is formed inside the overflow wall (27). 2. An underground pump unit according to claim 1, wherein said overflow chamber (28) communicates with a concrete tank (3). 3. A detachable hook (19) is provided on the horizontal axis submersible pump (9), and the detachable hook (19) is engaged with a detachable device (18) provided on the discharge pipe (5). The underground installation type pump unit according to any one of claims 1 to 2, characterized in that: 4. A support fitting (21) is provided upright on the bottom of the concrete tank (3), and a bottom of a horizontal shaft submersible pump (9) locked on a detachable device (18) is supported. The underground installation type pump unit according to claim 3, characterized in that: 5. A rotary drive device (47) is provided on the horizontal axis submersible pump (38, 53), and the horizontal axis submersible pump (3) is provided.
8, 53) and the outlet (38a, 53a) and the outlet (38
3. An underground installation according to claim 1 or 2, characterized in that b, 53b) are switchably connected to a short pipe (34, 50) and a discharge pipe (35, 51) on the inflow side of the concrete tank (3). Type pump unit. 6. A concrete casing (3) having a cylindrical casing (31) connected to a short pipe (34) and a discharge pipe (35) on the inflow side of the concrete vessel (3). The pump unit according to claim 5, characterized in that a rotary drive device (47) is arranged on the horizontal axis submersible pump (38) supported on the center axis of (5). 7. The inside of the concrete tank (3) is formed in a cylindrical shape, and a pump gate (52) supporting a horizontal shaft submersible pump (53) is provided in the concrete tank (3).
An underground pump unit according to claim 5, characterized in that the pump gate (52) is provided with a rotary drive (47). 8. A plurality of pipes (1a, 1b) are connected to the cylindrical concrete tank (3), and a plurality of horizontal shaft submersible pumps (53c, 53c, 53c) are connected to the pump gate (52a).
The underground pump unit according to claim 7, wherein 53d) is supported. 9. An underground pump unit according to claim 5, wherein said rotary drive device (47) comprises a hydraulic motor (58) and a speed reducer (59). . 10. The underground pump unit according to claim 9, wherein a hydraulic pressure accumulator (65) is interposed between the hydraulic motor (58) and the hydraulic pump unit (60). 11. The underground pump unit according to claim 5, wherein the rotary drive device (47) comprises an electric motor (70) and a speed reducer (71). 12. The submersible motor of the horizontal shaft submersible pump (9) is a variable speed motor (15), and the water level of the concrete tub (3) on the suction side is maintained at a predetermined water level. The underground installation type pump unit according to any one of claims 4, 7, and 8.