JP4145862B2 - Sewage relay pump equipment - Google Patents

Description

  The present invention relates to a sewage relay pump facility for feeding sewage in a sewer.

  Various sewage relay pump facilities for sending sewage in the sewer are known. For example, Patent Documents 1 and 2 describe a solid separation sewage relay pump facility.

  A conventional solid separation type sewage relay pump facility will be described with reference to FIGS. 18 and 19. A sewage storage tank 105 is disposed in a pit 100 installed on the ground or buried underground, and residue separators 101 </ b> A and 101 </ b> B are disposed in the sewage storage tank 105. An inflow pipe 102 and a discharge pipe 103 are connected to the residue separation tanks 101A and 101B. Further, connecting pipes 115A and 115B for connecting the respective residue separating tanks 101A and 101B and the sewage storage tank 105 are provided, and pumps 113A and 113B are interposed in these connecting pipes 115A and 115B. Separation valves or solid-liquid separation valves 117A and 117B for separating the residue from the sewage are attached to the ends of the connecting pipes 115A and 115B that open in the residue separation tanks 101A and 101B. Referring to FIG. 20 as well, the solid-liquid separation valves 117A and 117B are provided with a plurality of slits 117a in a cylindrical body that is open at both ends, and at the one end of the cylindrical body, a flap that can rotate in the direction of an arrow about a hinge 117b. 117c is provided. The size of the slit 117a is set so that the sewage contained in the sewage is larger than the foreign matter passage diameter of the pumps 113A and 113B and the sewage itself is allowed to pass though it is not allowed to pass. The connection pipes 115A and 115B are provided with normally-open inflow gate valves 119A, 119B, 121A, and 121B before and after the sewage pumps 113A and 113B.

  When the sewage pumps 113A and 113B are stopped, as shown by broken arrows in FIG. 19, the sewage flowing into the slag separation tanks 101A and 101B from the inflow pipe 102 is separated by the solid-liquid separation valves 117A and 117B. After that, it flows into the sewage storage tank 105 through the connecting pipes 115A and 115B. The residue separated from the sewage accumulates in the residue separation tanks 101A and 101B. At this time, the flaps 117c of the solid-liquid separation valves 117A and 117B are closed.

  When the sewage pumps 113A and 113B are operated, as shown by solid arrows in FIG. 19, the sewage stored in the sewage storage tank 105 passes through the connection pipes 115A and 115B by the sewage pumps 113A and 113B, and the residue separation tank 101A, It is pumped into 101B. As a result, the residue accumulated in the residue separation tanks 101A and 101B is sent downstream from the water supply pipes 103A and 103B together with the sewage. Balls 107 floating on the sewage are accommodated in the residue separation tanks 101A and 101B. As shown by a two-dot chain line in FIG. 19, when the wastewater is pumped by the wastewater pumps 113A and 113B, the ball 107 closes the connecting portion of the residue separation tanks 101A and 101B with the inflow pipe 102, and connects the inflow pipes 102A and 102B. Backflow of sewage is prevented. At this time, the solid-liquid separation valves 117A and 117B rotate upward around the hinge 117b and open.

  However, the conventional solid separation sewage relay pump equipment has the following problems with respect to the solid-liquid separation valves 117A and 117B shown in FIG. First, the solid-liquid separation valves 117A and 117B are provided with a flap 117c having a movable structure. The residue is fixed to the hinge 117b and the flap 117c is fixed in an open state or a closed state, and the solid-liquid separation valves 117A and 117B have their functions. There is a possibility that it will not be fulfilled. In particular, thread-like or fibrous residue such as hair is easily entangled with the hinge 117b.

In addition, it is necessary to secure a space for opening and closing the flap 117c. Therefore, in the sewage relay pump facility shown in FIGS. 18 and 19, the solid-liquid separation valves 117A and 117B are arranged in the residue separation tanks 101A and 101B. On the other hand, in order to dispose the solid / liquid separation valves 117A and 117B in the pipe lines connecting the residue separation tanks 101A and 101B and the pumps 113A and 113B, the solid / liquid separation valves 117A and 117B are provided in order to secure the open / close space of the flap 117c. It is necessary to increase the diameter of the portion where the slab is disposed. When this enlarged diameter portion is present, vortexes are generated and the residue stays when sewage is discharged from the pumps 113A and 113B to the residue separation tanks 101A and 101B. If the residue remains, the pressure of the sewage discharged from the pumps 113A and 113B is lost, and the residue in the residue separation tanks 101A and 102B may remain. If residue remains in the residue separation tanks 101A and 101B, the inflow of sewage from the residue separation tanks 101A and 101B to the submersible pumps 113A and 113B is inhibited.

German Patent No. 29505028U1 European Patent No. 074445041B1

  It is an object of the present invention to provide a solid separation type sewage relay pump facility that can reliably separate scum from sewage flowing from a sewage separation tank into a sewage storage tank without causing sticking of the scum. And

  The present invention is a sewage relay pump facility for feeding sewage flowing from the upstream side through the inflow pipe to the downstream side through the water supply pipe, wherein the inflow pipe and the water supply pipe extend to the inside. A reverse flow preventing mechanism disposed in the tank and in the sewage storage tank, connected to the inflow pipe and the water supply pipe, and allowing the inflow of sewage from the inflow pipe but preventing the backflow of sewage into the inflow pipe The waste separation tank and the waste water storage tank are disposed in the waste water storage tank, and the discharge port is connected to the waste water separation tank, while the suction port is opened in the waste water storage tank. The submersible pump permitting the reverse flow of sewage to the water, the flow path connecting the residue separation tank and the discharge port of the submersible pump, the base end side is fixed to the wall portion side of the flow path, the tip side is A plurality of screens located on the side of the residue separation tank from the base end side A plurality of screen members forming a sewage passage hole having a dimension equal to or smaller than the foreign substance passage diameter of the submersible pump, and a gap between adjacent screen members having a dimension equal to or smaller than the foreign substance passage diameter of the submersible pump. Provided is a sewage relay pump facility comprising a solid-liquid separation screen.

  When the submersible pump is stopped, sewage flows from the inflow pipe into the residue separation tank, and from the residue separation tank into the wastewater storage tank via the solid-liquid separation screen, the discharge port of the submersible pump, and the suction port of the submersible pump. Inflow. The residue contained in the sewage flowing into the discharge port of the submersible pump from the residue separation tank is separated by a solid-liquid separation screen. Accordingly, the residue is accumulated in the residue separation tank, and only the wastewater from which the residue has been separated is accumulated in the wastewater storage tank. When the submersible pump is operated, the sewage accumulated in the sewage storage tank flows into the residue separation tank through the suction port of the submersible pump, the discharge port of the submersible pump, and the solid-liquid separation screen. It is pumped to the water pipe with the residue accumulated in the water.

  The solid-liquid separation screen is composed of a plurality of screen members, and the clearance between the sewage passage hole formed on the tip side of the screen member and the adjacent screen member is less than the foreign matter passage diameter of the submersible pump. Therefore, when the submersible pump is stopped, the sewage contained in the sewage flowing from the slag separation tank to the submersible pump discharge port is reliably captured by the screen member, while the sewage itself has a gap between the sewage passage hole and the screen member. It flows through the outlet of the submersible pump. The screen member extends toward the central axis of the flow path, and the distal end side thereof is located closer to the residue separation tank than the proximal end side. Therefore, when the submersible pump is operated, the sewage trapped by the screen member is washed away by the sewage pumped from the sewage storage tank to the slag separation tank, and is pumped to the slag separation tank.

  Compared with a solid-liquid separation valve provided with a flap, the solid-liquid separation screen of the present invention has a simple structure because it has no moving parts. In addition, since there is no movable part, the function of the solid-liquid separation screen is not impaired by the adhesion of the residue contained in the sewage.

  As described above, the residue collected by the screen member is pumped to the residue separation tank by the sewage from the submersible pump. However, in order to wash away the residue more reliably, the screen member has a flow of sewage in the flow path. It is preferable to arrange | position so that.

  Specifically, the plurality of screen members are preferably arranged in a plane including the central axis of the flow path.

  Further, in order to wash off the residue reliably, it is preferable that at least the tip side of the screen member has an angle in the range of 5 degrees to 60 degrees with the central axis of the flow path.

  For example, the screen member is arranged in a truncated cone shape in the flow channel, and the tip of the screen member arranged in a circle when viewed from the central axis direction of the flow channel forms the sewage passage hole.

  A screen member consists of a rod-shaped body which has cross-sectional shapes, such as circular and a polygon, for example. The screen member may be an elongated plate-like body having various cross-sectional shapes.

The length of the screen member may be different. Specifically, the screen member includes a first screen member having a first length and a second screen member having a second length shorter than the first length, One screen member and the second screen member may be alternately arranged.

  Since the solid-liquid screen of the present invention including the screen member does not include a movable portion, the diameter of the flow path can be set equal to the diameter of the discharge port of the submersible pump. By suppressing the diameter of the flow path in the vicinity of the screen to the minimum necessary, it is possible to prevent the residue from staying due to the generation of vortices in this portion during operation of the submersible pump. As a result, when the submersible pump is in operation, the sewage discharged from the submersible pump ensures that the residue in the residue separation tank is pumped to the water supply pipe without any foreign matter remaining in the residue separation tank. Sewage smoothly flows from the residue separation tank to the submersible pump.

  In the sewage relay pump facility of the present invention, the sewage residue is separated from the sewage flowing into the sewage storage tank through the submersible pump from the slag separation tank by a solid-liquid separation screen having a plurality of screen members. It is possible to reliably separate the residue from the sewage without causing eddy, and to prevent the generation of vortices in the vicinity of the screen causing the residue to remain.

(First embodiment)
1 to 3 show a manhole type sewage relay pump facility 1 according to a first embodiment of the present invention.

  The sewage relay pump facility 1 feeds sewage flowing in from the upstream side through the inflow pipes 2A, 2B, 2C to the downstream side through the water supply pipe 3. The sewage relay pump facility 1 includes a manhole 4 embedded in the ground, which is a sewage storage tank, and in this manhole 4, an inflow tank 5, residue separation tanks 6A and 6B, submersible pumps 7A and 7B, and solid liquid Solid-liquid separation screens 8A and 8B, which are separation mechanisms, are arranged. The controller 9 shown only in FIG. 2 controls the operation of the submersible pumps 7 </ b> A and 7 </ b> B based on inputs from the throw-in water level meter 10 and the float-type water level meter 11. The opening 4a of the manhole 4 provided on the ground surface is closed by a manhole cover 4b. Moreover, as shown only in FIG. 2, the ladder 12 for an operator to enter the manhole 4 from the opening 4a is provided.

  Three inflow pipes 2 </ b> A to 2 </ b> C extend from the upstream side into the manhole 4. As shown most clearly in FIG. 3, the directions or directions in which the three inflow pipes 2 </ b> A to 2 </ b> C extend into the manhole 4 are different from each other. Further, as shown in FIG. 1, the height at which the three inflow pipes 2 </ b> A to 2 </ b> C penetrate the wall portion of the manhole 4 is also different from each other. One water pipe 3 extends from the inside of the manhole 4 to the downstream side.

  The inflow tank 5 will be described with reference to FIGS. As shown most clearly in FIG. 7, the inflow tank 5 has a rectangular box shape as a whole, and has a rectangular bottom plate (bottom portion) 15 in plan view and four side wall portions extending upward from the bottom plate 15. 16A, 16B, 16C, 16D are provided. Further, the upper part of the inflow tank 5 is not closed by a lid or the like, and an open part 17 having a rectangular shape in plan view is provided.

  The inflow tank 5 is fixed to the tops of the residue separation tanks 6A and 6B, and the bottom plate 15 of the inflow tank 5 functions as a lid for the residue separation tanks 6A and 6B. Specifically, as shown in FIG. 4, the open portions at the upper ends of the residue separation tanks 6 </ b> A and 6 </ b> B are closed on the lower surface side of the bottom plate 15 of the inflow tank 5. As will be described in detail later, the bottom plate 15 has inlets 27 for the residue separation tanks 6A and 6B.

  The side walls 16 </ b> A to 16 </ b> D are provided with closing plates 18 </ b> A, 18 </ b> B, 18 </ b> C, 18 </ b> D that are flat plates whose lower ends are connected to the bottom plate 15. These closing plates 18A to 18D are not formed with openings, slits or the like, and sewage does not flow out from these portions. The height from the bottom plate 15 of the closing plates 18A to 18D of the side wall portions 16A to 16D is the same.

  The long side wall portions 16 </ b> A and 16 </ b> C facing each other are each provided with two support members 19. The support member 19 has an elongated plate shape, is fixed inside the closing plates 18A and 18B, and extends upward from the bottom plate 15 in the vertical direction. Guide grooves 19 a are formed on a pair of side surfaces of the support member 19 that face each other. The support member 19 is disposed slightly outside the vicinity of the center in the length direction of the closing plates 18A and 18C (position where the closing plates 18A and 18C are divided into approximately four equal parts in the length direction). Further, the upper end of the support member 19 is located above the upper ends of the closing plates 18A and 18C. In the present embodiment, the height of the support member 19 from the bottom plate 15 is set to about twice the height of the closing plates 18A and 18C from the bottom plate 15.

  An elongated plate-like support member 20 extending upward in the vertical direction from the bottom plate 15 is also fixed inside the closing plates 18C and 18D of the side wall portions 16B and 16D in the short side direction facing each other. In the support member 20, a guide groove 20a is formed only on the side surface on the center side in the length direction of the closing plates 18B and 18D.

  The side walls 16A and 16C in the long side direction each include three screen plates 21. The screen plate 21 has an elongated rectangular shape, and a large number of square openings 21a penetrating in the thickness direction are formed in a lattice shape on the entire surface. The size of the opening 21a is set to be equal to or smaller than the foreign substance passage diameter of the submersible pumps 7A and 7B described later. The screen plate 21 is disposed so as to contact the inner surfaces of the closing plates 18A and 18D, and is detachably attached to the bottom plate 15 and the closing plate 18 by support members 19 and 20. Specifically, the screen plate 21 has one side edge inserted into the guide groove 19a of the support member 19 and the other side edge inserted into the gap between the support member 20 and the closing plates 18A and 18C. Are attached to the bottom plate 15 and the closing plate 18.

  Each of the side wall portions 16B and 16D in the short side direction also includes one screen plate 22. The screen plate 22 has the same structure as the screen plate 21 except for its short length, and an opening 22b having a size equal to or smaller than the foreign substance passage diameter of the submersible pumps 7A and 7B is formed on the entire surface. The screen plate 22 is detachably attached to the bottom plate 15 and the closing plate 18 by inserting both side edges into the guide grooves 20a of the support member 20.

  The screen plates 21 and 22 can be easily removed from the side wall portions 16A to 16D by being extracted from the guide groove 19a and the guide groove 20a of the support member 19 and the support member 20, and conversely, the guide of the support member 19 and the support member 20 is guided. It can be easily attached from the side walls 16A to 16D simply by being inserted into the groove 19a and the guide groove 20a. The screen plates 21 and 22 can be removed and cleaned on the ground, and can be easily replaced if broken or damaged. In this respect, the inflow tank 5 is excellent in maintainability.

  The height of the screen plates 21 and 22 is about twice the height of the closing plates 18A to 18D, and the upper portions of the screen plates 21 and 22 protrude from the upper ends of the closing plates 18A to 18D. Accordingly, the side walls 16A to 16B are the closing plates 18A to 18B having no openings on the lower side and the screen plates 21 and 22 on the upper side.

  As shown most clearly in FIGS. 4 and 5, the open ends 2 a of the inflow pipes 2 </ b> A to 2 </ b> C extend from the open portion 17 to the inside of the inflow tank 5. The open ends 2a of the inflow pipes 2A to 2C are positioned above the bottom plate 15 of the inflow tank 5, and the open ends 2a and the bottom plates 15 of the inflow pipes 2A to 2C are spaced apart.

  Since the inflow tank 5 includes the bottom plate 15 and the side wall portions 16A to 16D and has the open portion 17 on the upper side, the inflow pipes 2A to 2C are highly flexible. That is, as long as the open end 2a of the inflow pipe can be disposed in the open portion 17 of the inflow tank 5, the number of inflow pipes, the diameter of the inflow pipe, and the direction and height of the inflow pipe extending into the manhole 4 are not limited. In particular, when there are a plurality of inflow pipes as in this embodiment, if the projected area on the horizontal plane of the open portion 17 of the inflow tank 5 is larger than the sum of the cross-sectional areas of the open ends of the plurality of inflow pipes, Sewage can flow into the inflow tank from these inflow pipes.

  As shown most clearly in FIG. 6, the projected area of the open portion 17 of the inflow tank 5 onto the horizontal plane is significantly larger than the sum of the cross-sectional areas of the open ends 2 a of the three inflow pipes 2 </ b> A to 2 </ b> C. Therefore, even when there are several more inflow pipes having the same diameter as those of the inflow pipes 2A to 2C, it is not necessary to change the design of the inflow tank 5 or the like.

  Next, the residue separation tanks 6A and 6B will be described with reference to FIGS. The bottom separation tanks 6 </ b> A and 6 </ b> B are fixed to a pre-rotation tank 26 arranged at the bottom of the manhole 4 by a pedestal 25 at the lower end side. Further, the screen residue separation tanks 6A and 6B are provided with an inlet 27 communicating with the inside of the inflow tank 5 at the upper end thereof. As shown in FIG. 4, a stepped hole 15a is provided in the bottom plate 15 of the inflow tank 5 constituting the top of the residue separation tanks 6A and 6B so as to penetrate in the plate thickness direction. A disc 28 having an inflow port 27 is fixed by bolts 29 so as to penetrate through.

  Balls 31 are accommodated inside the residue separation tanks 6A and 6B. The peripheral edge of the inflow port 27 on the lower surface of the disc 28 (the surface on the inner side of the residue separation tanks 6A and 6B) functions as the valve seat 32. If the ball 31 is detached from the valve seat 32, the inflow port 27 is opened. If the ball 31 is seated on the valve seat 32, the inlet 27 is closed. The ball 31 and the valve seat 32 permit the inflow of sewage from the inflow pipes 2A to 2B into the residue separation tanks 6A and 6B, but the sewage from the inside of the residue separation tanks 6A and 6B to the inflow pipes 2A to 2C. It functions as a backflow prevention mechanism that prevents backflow.

  Referring to FIG. 4, the flow path diameter D1 of the inlet 27 of the residue separation tanks 6A and 6B is set to be equal to or smaller than the flow path diameter D2 of the flow path 34a of the outflow pipe 34 of the residue separation tanks 6A and 6B described later. .

  One outflow pipe 34 that functions as an outlet is provided at the bottom of the residue separation tanks 6A and 6B. The outflow pipes 34 of the residue separation tanks 6A and 6B are connected to one ends of the corresponding water supply branch pipes 35A and 35B. The other ends of the water supply branch pipes 35 </ b> A and 35 </ b> B are connected to the water supply pipe 3. Further, a ball valve 36 and a check valve 37 are interposed in the water supply branch pipes 35A and 35B in order to prevent the backflow of sewage from the water supply pipe 3 to the residue separation tanks 6A and 6B.

  In addition, a pair of sewage inlet / outlet pipes 40 extending in the horizontal direction functioning as a sewage inlet / outlet are provided at the lower part of the residue separation tanks 6A and 6B. The discharge pipe 44 of the corresponding submersible pumps 7A and 7B is detachably connected to the sewage inlet / outlet pipe 40.

  Next, the submersible pumps 7A and 7B will be described. The submersible pumps 7A and 7B include a pump main body 41 in which an involute chamber in which an impeller (not shown) is arranged is formed, and a submersible motor 42 for rotationally driving the impeller. The pump body 41 includes a suction pipe (suction port) 43 that extends downward. The end of the suction pipe 43 is located above the pre-swirl tank 26 and is open to the inside of the manhole 4. The pump main body 41 includes a discharge pipe (discharge port) 44 extending in the horizontal direction toward the residue separation tanks 6A and 6B. Solid-liquid separation screens 8 </ b> A and 8 </ b> B are fixed to the flange 44 a at the end of the discharge pipe 44 by bolts 45. The submersible pumps 7A and 7B need to be configured such that when stopped, the sewage flowing into the discharge pipe 44 from the residue separation tanks 6A and 6B flows back to the suction pipe 43 and is discharged from the suction pipe 43 into the manhole 4. There is. In this specification, the minimum diameter of the flow path from the suction pipe 43 to the discharge pipe 44 of the submersible pumps 7A and 7B is referred to as a foreign substance passage diameter of the submersible pumps 8A and 8B.

  Next, the solid-liquid separation screens 8A and 8B will be described with reference to FIGS. The solid-liquid separation screens 8A and 8B each include a flat rectangular parallelepiped block 47 as a whole. A flow path 47 a penetrating the block 47 is formed. The flow path 47a is connected to the flow path 40a in the sewage inlet / outlet pipe 40 of the residue separation tanks 6A and 6B at the right end in the figure, and the left end in the figure is inside the discharge pipe 44 of the submersible pumps 7A and 7B. It communicates with the flow path 44b.

  A plurality of screen members 48 are arranged in the flow path 47a of the solid-liquid separation screens 8A and 8B. The screen member 48 is formed of a relatively thin rod-like body having a circular cross section. The cross-sectional shape of the screen member 48 is not limited to a circular shape, and may be another shape such as a polygonal shape. The individual screen members 48 are arranged along the flow of sewage in the flow path 47a. In other words, each screen member 48 is arranged in a virtual plane including the central axis C of the flow path 47a. For example, two screen members 48 are arranged on the plane P including the central axis C shown in FIG.

  As shown in FIG. 8, the base end 48a of each screen member 48 is fixed by being embedded in the wall portion (block 47) of the flow path 47a. A first portion 48b extends from the base end 48a at a constant angle θ1 with respect to the central axis C of the flow path 47a. Further, the second portion 48c extends from the first portion 48b at a constant angle θ2 smaller than the angle θ1 with respect to the central axis C. Therefore, the individual screen members 48 as a whole extend from the base end side to the tip end side toward the central axis C of the flow path, and the second portion 48b on the tip end side is more than the first portion 48b on the base end side. It is located on the residue separation tank 6A, 6B side.

  The plurality of screen members 48 are arranged so as to form a truncated cone shape in the flow path 47a, and when viewed from the direction of the central axis C of the flow path 47a, the tip 48d of the screen member 48 is circular (reference numeral α in FIG. 9). The portion surrounded by the tip 48d forms a sewage passage hole 49. The diameter of the sewage passage hole 49 is set to be equal to or smaller than the foreign matter passage diameter of the submersible pumps 7A and 7B. Further, the gap 50 between the adjacent screen members 48 is also set to be equal to or smaller than the foreign substance passage diameter.

  Since the solid-liquid separation screens 8A and 8B composed of the block 47 and the screen member 48 are composed of only a fixed part and are not provided with a movable part such as a flap (see FIG. 20), in order to secure a region where the movable part moves, It is not necessary to set the flow path diameter D3 of the flow path 47a large. In the present embodiment, the flow path diameter D3 of the flow path 47a is set to the minimum necessary size, that is, equal to the flow path diameter D4 of the discharge pipe 44 of the submersible pumps 7A and 7B.

  The connection structure of the submersible pumps 7A and 7B and the residue separation tanks 6A and 6B will be described with reference to FIGS. As described above, the solid-liquid separation screens 8A and 8B are fixed to the flange 444a of the discharge pipe 44 of the submersible pumps 7A and 7B, and the base end side of the slider 55 is secured to the block 47 of the solid-liquid separation screens 8A and 8B by the bolts 56. It is fixed. A hook-like protrusion 55 a that protrudes downward is provided on the tip side of the slider 55. An inclined surface 55b is formed on the hook-like protrusion 55a. On the other hand, an inclined surface 40c corresponding to the inclined surface 55b of the hook-like protrusion 55a is provided on the upper portion of the flange 40b of the sewage inlet / outlet pipe 40 of the residue separation tanks 6A and 6B. The inclined surface 55b of the hook-like protrusion 55a is locked to the inclined surface 40c of the flange 40b of the sewage inlet / outlet pipe 40, so that the solid-liquid separation screens 8A, 8B are separated from the sewage inlet / outlet pipe 40 of the residue separation tanks 6A, 6B. Is held in the positioning state. Since the hook-shaped protrusion 55a and the flange 40b are connected to each other, the submersible pumps 7A and 7B and the solid-liquid separation screens 8A and 8B can be attached to and detached from the residue separation tanks 6A and 6B simply by raising and lowering.

  In the manhole 4, a pair of guide rods 58A, 58B extending in the vertical direction is provided for each submersible pump 7A, 7B. The aforementioned slider 55 has notches 55c formed on both sides thereof, and the notches 55c are fitted into the guide rods 58A and 58B. Accordingly, the submersible pumps 7A and 7B can be raised and lowered along the guide rods 58A and 58B.

  Next, with reference to FIG. 10A to FIG. 10D further, operation | movement of the sewage relay pump equipment 1 of 1st Embodiment is demonstrated. Normally, if one of the pair of submersible pumps 7A and 7B is in an operating state, the other is in a stopped state, and sewage from the inflow pipes 2A to 2C can flow into the residue separation tank corresponding to the stopped submersible pump. It is. In the following description, unless otherwise stated, the description will be given focusing on one of the submersible pumps 7A and the corresponding residue separation tank 6A.

  As shown in FIG. 10A, sewage containing residue flows into the inflow tank 5 from the inflow pipes 2A to 2C. The sewage that has flowed into the inflow tank 5 flows into the residue separation tank 6 </ b> A from the inlet 27 that opens to the bottom plate 15 of the inflow tank 5.

  As described above, the flow path diameter D1 of the inlet 27 of the residue separation tank 6A is set to be equal to or smaller than the flow path diameter D2 of the flow path 34a of the outflow pipe 34 of the residue separation tank 6A. Therefore, the large slag that cannot pass through the sewage inlet / outlet pipe 40 does not flow into the slag separation tank 6 </ b> A from the inlet 27 but remains on the bottom plate 15 of the inflow tank 5. Therefore, blockage of the sewage inlet / outlet pipe 40 and the outflow pipe 34 of the residue separation tank 6A can be prevented.

  When the inlet 27 and the solid-liquid separation screen 8A of the residue separation tank 6A are temporarily blocked, the sewage flowing from the inflow pipes 2A to 2C is the lower part of the side walls 16A to 16D of the inflow tank 5, that is, the closing plate. It overflows from the portion surrounded by 18A to 18D and directly flows into the manhole 4 (overflow). If the overflowing sewage contains impurities or large scale residue, the large scale residue may be sucked into the suction port when the submersible pump 7A is operated, which may cause blockage. However, the upper side portions of the side wall portions 16A to 16D have screen plates 21 and 22, and the sewage passes through the openings 21a and 22a of the screen plates 21 and 22 having a size equal to or smaller than the foreign substance passage diameter of the submersible pump 7A. Overflow into 4 At this time, a large residue larger than the foreign substance passage diameter contained in the sewage cannot pass through the openings 21a and 22a and remains in the inflow tank 5. Therefore, even when overflow of sewage occurs, it is possible to prevent the large scale residue from flowing into the manhole 4 and to prevent the submersible pump 7A from being blocked due to the overflow.

  As shown in FIG. 10B, the sewage flowing into the residue separation tank 6A further flows into the discharge pipe 44 of the submerged pump 7A through the sewage inlet / outlet pipe 40 via the solid-liquid separation screen 8A, and enters the submersible pump 7A. And then discharged into the manhole 4 from the suction pipe 43. Since the residue is separated by the screen member 48 when passing through the flow path 47a of the solid-liquid separation screen 8A, the residue is accumulated in the residue separation tank 6A, and the sewage from which the residue has been separated becomes manhole. 4 is accumulated. Since the diameter of the sewage passage hole 49 and the gap 50 between the adjacent screen members 48 are set to be equal to or smaller than the foreign substance passage diameter, the screen member 48 may cause inconvenience such as blockage of the submersible pump 7A. Captured reliably. On the other hand, the sewage itself flows through the sewage passage hole 49 and the gap 50 to the discharge pipe 44 of the submersible pump 7A. As shown in FIG. 10C, the ball 31 rises as the residue in the residue separation tank 6A increases.

  When the water level gauges 10 and 11 detect that the manhole 4 has reached a predetermined water level, the controller 9 starts the submersible pump 7A. As shown in FIG. 10D, when the submersible pump 7 </ b> A is activated, the sewage in the manhole 4 is sucked from the suction pipe 43 and discharged from the discharge pipe 44. The sewage discharged by the submersible pump 7A passes through the solid-liquid separation screen 8A and is pumped from the sewage inlet / outlet pipe 40 into the residue separation tank 6A. The residue accumulated in the residue separation tank 6A is sent to the water supply pipe 3 through the outflow pipe 34 together with the sewage pumped from the submersible pump 7A. The inlet 27 connecting the residue separating tank 6A and the inflow tank 5 is closed by the ball 31 seated on the valve seat 32. Accordingly, the sewage does not flow backward from the residue separating tank 6A to the inflow tank 5.

  As described above, the screen member 48 of the solid-liquid separation screen 8A is arranged along the flow of sewage in the flow path 47a, and from the base end side (submersible pump 7A side) to the front end side (the residue separation tank 6A side). It extends toward the central axis C of the channel 47a. Therefore, the screen member 48 has an extremely small effect of preventing the residue from moving from the submersible pump 7A side to the residue separation tank 6A side in the flow path 47a. For example, since the tip 48d of the screen member 48 faces the residue separation tank 6A, the residue moves from the submersible pump 7A side to the residue separation tank 6A, and the residue does not stick into the tip 48d of the screen member 48. Therefore, the residue captured by the screen member 48 at the time of inflow of sewage (see FIGS. 10A to 10C) is easily discharged by the sewage discharged from the submersible pump 7A and flowing through the flow path 47a toward the residue separation tank 6A. And it is reliably washed away from the screen member 48 and is pumped to the residue separation tank 6A. In order to wash away residue from the screen member 48 with the sewage discharged from the submersible pump 7A more reliably, the angles θ1 and θ2 of the first and second portions 48b and 48c of the screen member 48 are in the range of 5 degrees to 60 degrees. It is preferable to set to.

  As described above, since the solid-liquid separation screen 8A has no movable portion, the flow path diameter D3 of the flow path 47a formed in the block 47 of the solid-liquid separation screen 8A is the minimum necessary size, that is, the flow of the discharge pipe 44. It is set equal to the path diameter D4. Accordingly, it is possible to prevent the sewage discharged from the submersible pump 7A and flowing toward the residue separation tank 6A from generating vortices in the vicinity of the screen member 48, and there is no retention of residue due to the vortex. Accordingly, the sewage discharged from the submersible pump 7A ensures that the residue in the residue separation tank 6A is pumped from the outflow pipe 34 to the water supply pipe 3, and no foreign matter remains in the residue separation tank 6A. When stopped (see FIGS. 10A to 10C), the sewage smoothly flows from the residue separation tank 6A to the submersible pump 7A.

  11A to 11C show alternative shapes of the openings 21 a and 22 a of the screen plates 21 and 22 of the inflow tank 5. In the example of FIG. 11A, the openings 21a and 22a are rhombuses. In the example of FIG. 11B, the openings 21a and 22a are circular. In FIG. 11C, the openings 21a and 22a are elongated slits. These openings 21a and 22a may extend in the same direction as the flow path, or may extend in a direction crossing the flow path. The shape of the openings 21a and 22a is not particularly limited as long as the condition that the size is equal to or smaller than the foreign substance passage diameter of the submersible pump is satisfied.

  12A and 12B show alternative shapes of the bottom plate 15 and the open portion 17 of the inflow tank 5. In the example of FIG. 12A, the bottom plate 15 has a shape in which a short rectangular addition portion 62 having a small area is continuously provided at one end of a long and narrow rectangular main body 61 having a large area. The side wall portion 16 extends vertically upward from the bottom plate 15, and the open portion 17 has the same shape as the bottom plate 15. The main body 61 of the bottom plate 15 is opened with the inlets 27 of the residue separation tanks 6A and 6B. Two inflow pipes 2A and 2B extend into the manhole 4, and the open end 2a of one inflow pipe 2A extends from the open portion 17 to the inside of the inflow tank 5 at the portion of the main body 61 of the bottom plate 15. The inflow pipe 2 </ b> B extends from the open portion 17 into the inflow tank 5 at the additional portion 62 of the bottom plate 15.

  In the example of FIG. 12B, the bottom plate 15 has a shape in which square addition parts 62 and 63 having a small area are connected to both ends of a square body 61 having a large area. The side wall portion 16 extends vertically upward from the bottom plate 15, and the open portion 17 has the same shape as the bottom plate 15. Three inflow pipes 2A to 2C extend into the manhole 4, and the open end 2a of one inflow pipe 2A extends from the open portion 17 into the inflow tank 5 at the portion of the main body 61, and the remaining inflow The pipes 2B and 2C extend from the open portion 17 into the inflow tank 5 at the additional portions 62 and 63, respectively.

  13A to 13C show an alternative of the solid-liquid separation screen 8. In the example of FIG. 13A, screen members 48A and 48B having two types of lengths are alternately arranged. The screen member 48A is longer than the screen member 48B. A portion surrounded by the tip of the screen member 48 </ b> A forms a sewage passage hole 49.

  In the example of FIG. 13B, the screen member 48 has a straight shape without bending or bending, and all the screen members 48 have the same length.

  In the example of FIG. 13C, the solid-liquid separation screen 8 includes a tapered cylindrical body 65 having openings at both ends, instead of the rod-shaped screen member. A slit 65 a is formed in the cylindrical body 65. A portion 65 b of the cylindrical body 65 not provided with the slit 65 a functions as a screen member, and the slit 65 a functions as a gap between the adjacent screen members 48. Moreover, the opening end 65c on the small diameter side of the cylindrical body 65 functions as a dirty water passage hole.

(Second Embodiment)
In the second embodiment of the present invention shown in FIGS. 14 and 15, the inner peripheral surface 4 c of the manhole 4 is used as a part of the side wall portion of the inflow tank 5. Specifically, the inflow tank 5 includes an arc-shaped bottom plate 70 in plan view, and the outer peripheral side of the bottom plate 70 is in contact with the inner peripheral surface 4 c of the manhole 4. Further, on the inner peripheral side of the bottom plate 70, side wall portions 71A, 71B, 71C extending upward in the vertical direction are provided. A side wall portion 71A at the center in the length direction of the bottom plate 70 and a pair of side wall portions 71B continuous with the side wall portion 71A are provided with a closed portion 71a having no opening or the like on the lower side, and are slit-like extending vertically on the upper side. A screen portion 71c provided with an opening 71b is provided. The entire pair of side wall portions 71C at the end of the bottom plate 70 is a closed portion.

  The open ends 2 a of the three inflow pipes 2 </ b> A to 2 </ b> C do not extend to the inflow tank 5 and are stopped at the inner peripheral surface 4 c of the manhole 4. In order to allow sewage to flow from the opening end 2a of the inflow pipes 2A to 2C to the inflow tank 5, casings 72A, 72B, and 72C having a semicircular cross section extending in the vertical direction are provided. These casings 72 </ b> A to 72 </ b> C are in contact with the inner peripheral surface 4 c of the manhole 4 at both sides, and form a flow path for allowing natural water to flow down together with the inner peripheral surface 4 c of the manhole 4. The upper ends of the casings 72 </ b> A to 72 </ b> C extend to a position corresponding to the open ends 2 a of the inflow pipes 2 </ b> A to 2 </ b> C, and the lower ends are located above the inflow tank 5.

  Sewage flows into the inflow tank 5 from each of the inflow pipes 2A to 2C through the casings 72A to 72C, and flows into the residue separation tanks 6A and 6B from the inlet 27 provided at the center in the length direction of the bottom plate 70. .

  Other configurations and operations of the second embodiment are the same as those of the first embodiment.

(Third embodiment)
In the third embodiment of the present invention shown in FIG. 16 and FIG. 17, the inflow tank 5 is the inflow tank main body 81 disposed in the central portion inside the manhole 4 in plan view, and the sewage flowing from the inflow pipes 2A to 2C. A collecting tank 82 for collecting, and connecting flow paths 83A, 83B, 83C for introducing sewage from the collecting tank 82 to the inflow tank main body 81 are provided. The structure of the inflow tank main body 81 is the same as that of the inflow tank 5 of the second embodiment.

  The collection tank 82 includes an arc-shaped bottom wall 85 in plan view, and the outer peripheral side of the bottom wall 85 is in contact with the inner peripheral surface 4 c of the manhole 4. A side wall 86 extending in the vertical direction is provided on the inner peripheral side of the bottom wall 85. Above the collection tank 82 is an open portion 87. As in the second embodiment, the open ends 2a of the inflow pipes 2A to 2C are stopped at the inner peripheral surface 4c of the manhole 4, and the lower ends of the casings 72A to 72C corresponding to the inflow pipes 2A to 2C are the collection tanks 82, respectively. It is located in the vicinity of the open part 87.

  The connection flow paths 83A to 83C are provided at positions corresponding to the housings 72A to 72C in plan view. Each connection channel 83 </ b> A to 83 </ b> C includes a bottom wall 88 and a side wall 89 extending vertically upward from both sides of the bottom wall 88. The side wall 89 is not provided with an opening or the like. One end of each connection channel 83 </ b> A to 83 </ b> C is connected to the collection tank 82, and the other end is connected to the inflow tank body 81.

  Sewage flows into the collection tank 82 from the inflow pipes 2A to 2C via the housings 72A to 72C. Sewage flows from the collection tank 82 into the inflow tank 5 through the connection channels 83A to 83C. Sewage flows from the inlet 27 provided in the bottom plate 70 of the inflow tank 5 into the residue separation tanks 6A and 6B.

  Other configurations and operations of the third embodiment are the same as those of the first embodiment.

  Although the present invention has been described by taking a manhole type sewage pump relay facility as an example, it can also be applied to other types of sewage relay pump facilities of the present invention. For example, the sewage inflow tank may be installed on the ground.

Sectional drawing which shows the manhole type sewage relay pump equipment which concerns on 1st Embodiment of this invention. Sectional drawing in the II-II line of FIG. Sectional drawing in the III-III line of FIG. The partial cross-section part enlarged side view which shows an inflow tank, a residue separation tank, and a submersible pump. The partial expanded front view which shows an inflow tank, a residue separation tank, and a submersible pump. The partial expanded plan view which shows an inflow tank, a residue separation tank, and a submersible pump. The perspective view which shows an inflow tank. The partial expanded sectional view which shows a solid-liquid separation screen. The perspective view which shows a solid-liquid separation screen. The schematic sectional drawing which shows the state at the time of the inflow start of the sewage to a residue separation tank. The schematic sectional drawing which shows the state in inflow of the sewage to a residue separation tank. The schematic sectional drawing which shows the state with which the residue separation tank was filled with the residue. The schematic sectional drawing which shows the state which sews in a manhole with a submersible pump, and pumps it through a residue separation tank. The partial front view which shows the 1st alternative of the opening formed in the side wall board of an inflow tank. The partial front view which shows the 2nd alternative of the opening formed in the side wall board of an inflow tank. The partial front view which shows the 3rd alternative of the opening formed in the side wall board of an inflow tank. The typical top view which shows the 1st alternative of the shape in planar view of an inflow tank. The typical top view which shows the 2nd alternative of the shape by planar view of an inflow tank. The front view which shows the 1st alternative of a solid-liquid separation screen. The perspective view which shows the 2nd alternative of a solid-liquid separation screen. The perspective view which shows the 3rd alternative of a solid-liquid separation screen. The typical top view showing manhole type sewage relay pump equipment concerning a 2nd embodiment of the present invention. Sectional drawing in the XV-XV line | wire of FIG. The typical top view showing the manhole type sewage relay pump equipment concerning a 3rd embodiment of the present invention. Sectional drawing in the XVII-XVII line of FIG. The cross-sectional view which shows the conventional solid separation type sewage relay pump equipment. Sectional drawing in the XIX-XIX line | wire of FIG. The fragmentary perspective view which shows a separation valve.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Sewage relay pump equipment 2A, 2B, 2C Inflow pipe 2a Open end 3 Water supply pipe 4 Manhole 4a Open 4b Manhole cover 5 Inflow tank 6A, 6B Sediment separation tank 7A, 7B Submersible pump 8A, 8B Solid-liquid separation screen 9 Controller 10 Throwing type water level meter 11 Float type water level meter 12 Ladder 15 Bottom plate 28 Disc 29 Bolt 16A, 16B, 16C, 16D Side wall portion 17 Opening portion 18A, 18B, 18C, 18D Closing plate 19, 20 Support member 19a, 20a Guide groove 21, 22 Screen plate 21a, 22a Opening 25 Base 26 Pre-rotation tank 27 Inlet 31 Ball 32 Valve seat 34 Outlet pipe 35A, 35B Water supply branch pipe 36 Ball valve 37 Check valve 40 Sewage inlet / outlet pipe 40c Inclined surface 41 Pump body 42 Underwater Motor 43 Suction pipe 44 Discharge pipe 47 Block 48 Screen member 48a Base end 48b First portion 48c Second portion 48d Tip 49 Sewage passage hole 50 Clearance 55 Slider 55a Hook-like projection 55b Inclined surface 55c Notch 58A, 58B Guide rod 61 Main body 62, 63 Additional portion 65 Cylindrical body 65a Slit 65b Portion 65c Open end 4c Inner peripheral surface 70 Bottom plate 71A, 71B, 71C Side wall portion 71a Closed portion 71b Opening 71c Screen portion 72A, 72B, 72C Housing 81 Inflow tank body 82 Collection tank 85 Bottom wall 86 Side wall 87 Open part 83A, 83B , 83C Connecting flow path 88 Bottom wall 89 Side wall

Claims (6)

A sewage relay pump facility for feeding sewage flowing from the upstream side through the inflow pipe to the downstream side through the water supply pipe,
A wastewater storage tank in which the inflow pipe and the water supply pipe extend to the inside;
A reverse flow prevention mechanism disposed in the sewage storage tank, connected to the inflow pipe and the water supply pipe and permitting the inflow of sewage from the inflow pipe but preventing the backflow of sewage into the inflow pipe; A residue separation tank;
It is arranged in the sewage storage tank, and the discharge port is connected to the residue separation tank, while the suction port is opened in the sewage storage tank and permits the backflow of sewage from the discharge port to the suction port when stopped. Submersible pumps,
Arranged in a flow path connecting the residue separation tank and the discharge port of the submersible pump, the base end side is fixed to the wall portion side of the flow path, and the distal end side is closer to the residue separation tank side than the base end side A plurality of screen members positioned at the front end, the tip side of the plurality of screen members forms a sewage passage hole having a size equal to or smaller than the foreign matter passage diameter of the submersible pump, and a gap between adjacent screen members is a foreign matter of the submersible pump. A sewage relay pump facility comprising a solid-liquid separation screen having a size smaller than the passage diameter.   The sewage relay pump facility according to claim 1, wherein each of the plurality of screen members is disposed in a plane including a central axis of the flow path.   The sewage relay pump facility according to claim 2, wherein at least the tip side of the screen member forms an angle in a range of 5 degrees to 60 degrees with the central axis of the flow path.   The screen member is arranged in a truncated cone shape in the flow path, and a tip of the screen member arranged in a circle when viewed from the central axis direction of the flow path forms the sewage passage hole. The sewage relay pump facility according to any one of claims 1 to 3.   The sewage relay pump facility according to any one of claims 1 to 4, wherein the screen member is formed of a rod-shaped body.   The sewage relay pump equipment according to any one of claims 1 to 5, wherein a diameter of the flow path is equal to a diameter of a discharge port of the submersible pump.

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