Fluid transfer device

Abstract

To provide a transfer method of a fluid transfer device capable of transferring scum regardless of its specific gravity and a fluid transfer device.SOLUTION: A transfer method of a fluid transfer device 1 provided with a receiving part 111 receiving scum and a transfer space forming member 112 defining a transfer space V2 into which the scum flows from the receiving part 111 includes: a flow-in process of causing the scum received in the receiving part 111 to flow into the transfer space V2; a cut-off process of bringing the transfer space V2 into which the scum flows into a cut-off state of being cut off from the receiving part 111: and a transfer process of transferring the scum in the transfer space V2 by discharging transfer water to the transfer space V2 in the cut-off state, wherein the flow-in process is a process to connect the transfer space V2 and the receiving part 111 to cause the scum received in the receiving part 111 to flow into the transfer space V2.SELECTED DRAWING: Figure 5

Description

[Technical Field]

[0001] The present invention relates to a fluid transfer device including a receiving section for receiving screen residue and a transfer space forming member for defining a transfer space into which screen residue flows from the receiving section. Place Regarding. [Background technology]

[0002] In sewage treatment facilities, screened residue removed in a settling basin or the like is transported to a storage device using a transfer device. Belt conveyors have traditionally been used as transfer devices, but they have problems such as odor leakage and difficulty changing the transport direction without transferring to another belt conveyor. Belt conveyors also require maintenance space below, so they are installed above ground level. Furthermore, when transferring to another belt conveyor, the screened residue is dropped downward at the downstream end of each belt conveyor before transferring to the next belt conveyor. Therefore, when multiple belt conveyors are used, the first belt conveyor must be located at a fairly high position. In this case, in order to transfer the screened residue from the dust collector to the first belt conveyor at a high position, a taller dust collector capable of transporting the screened residue to a high position must be installed in the settling basin or the like. This also creates the problem of expensive dust collectors.

[0003] In response to this, a fluid transfer device that transfers screen residue within a pipe using transfer water has been proposed in recent years (see, for example, Patent Document 1). The fluid transfer device in Patent Document 1 includes a tank with an opening at its upper end, a supply pipe connected to the tank, and a discharge pipe connected to its lower end. After screen residue and water are poured into the tank through the opening, the upper opening is closed, and transfer water is pumped into the tank through the supply pipe. The flow of the pumped transfer water attempts to transport the screen residue stored in the tank by sending it to the discharge pipe. This fluid transfer device minimizes the risk of odor leakage, and the transfer direction can be easily changed midway along the transfer path by bending the discharge pipe. Furthermore, this fluid transfer device can also transfer screen residue from a low position to a high position, eliminating the need to raise the dust collector. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2012-86987 Summary of the Invention [Problem to be solved by the invention]

[0005] However, screened sediment is a mixture of many different types with different specific gravities, some of which rise to the surface of the water, some of which sink, and some of which float in the water. The discharge-side pipe of the fluid transfer device of Patent Document 1 mainly discharges sinking screened sediment, and the floating screened sediment in particular cannot be discharged to the discharge-side pipe and may remain in the tank. While it is conceivable to connect the discharge-side pipe to the tank near the water surface or at an intermediate height in the tank's water depth, this would make it difficult to discharge at least the sinking screened sediment.

[0006] In view of the above circumstances, the present invention provides a fluid transfer device capable of transferring screen residue regardless of its specific gravity. Place The purpose is to provide. [Means for solving the problem]

[0008] above The fluid transfer device of the present invention that solves the above object includes a receiving portion that receives screen residue; a transfer space forming member that defines a transfer space into which the residue flows from the receiving portion; a switching means for switching a connection state between the receiving section and the transfer space between a flow-through state in which the receiving section and the transfer space are connected and a blocked state in which the receiving section and the transfer space are blocked; a transfer means for transferring the residue that has flowed into the transfer space from the receiving section in the circulating state by discharging transfer water into the transfer space in the blocked state; The switching means is characterized by connecting the transfer space and the receiving section to switch to the circulating state. [Effects of the Invention]

[0009] According to the present invention, a fluid transfer device capable of transferring screen residue regardless of its specific gravity is provided. Place We can provide what we offer. [Brief explanation of the drawings]

[0010] [Figure 1] FIG. 1 is a plan view showing a schematic diagram of a pumping station and a fluid transfer device. [Figure 2] 2 is a cross-sectional view schematically illustrating the pumping station and fluid transfer device shown in FIG. 1. FIG. [Figure 3] FIG. 1(a) is a cross-sectional view showing the main body of the transfer device, and FIG. 1(b) is a cross-sectional view taken along the line AA in FIG. 1(a). [Figure 4] 3(a) is a cross-sectional view showing the inner tube rotated 90 degrees counterclockwise from FIG. 3(b), and FIG. 3(b) is a cross-sectional view showing the inner tube rotated another 90 degrees counterclockwise from FIG. 3(a). [Figure 5] 2 is a flowchart showing the operation of the fluid transfer device shown in FIG. [Figure 6] FIG. 2 is a plan view similar to FIG. 1, showing a schematic diagram of a modified example of a pumping station and a fluid transfer device. [Figure 7] 3(a) is a cross-sectional view of the fluid transfer device of the second embodiment similar to FIG. 3(a), and FIG. 3(b) is a cross-sectional view taken along line BB of FIG. 3(a). [Figure 8] 7A is a cross-sectional view taken along the line CC in FIG. 7A showing the fluid transfer device in a flowing state, (b) is a cross-sectional view taken along the line CC in FIG. 7A showing the fluid transfer device in a blocked state after the inner cylinder has rotated 180 degrees from (a) in FIG. 7A, and (c) is a cross-sectional view taken along the line CC in FIG. 7A showing the fluid transfer device in a blocked state after the inner cylinder has rotated 50 degrees from (a) in FIG. [Figure 9] (a) is a cross-sectional view similar to FIG. 3(b) showing the blocked state of the transfer device main body of the third embodiment, (b) is a cross-sectional view showing the state in which the inner tube has rotated from FIG. 3(a) to enter the first flow state, and (c) is a cross-sectional view showing the state in which the inner tube has rotated from FIG. 3(a) to enter the second flow state. [Figure 10] 10 is a flowchart showing the operation of the fluid transfer device shown in FIG. [Figure 11] FIG. 10 is a view of the transfer device body of the fourth embodiment, viewed from the downstream side toward the upstream side of the flow of wastewater in the settling basin. [Figure 12] 12 is a flowchart showing the operation of the fluid transfer device shown in FIG. [Figure 13] 12 is a view similar to FIG. 11, showing a modification of the fluid transfer device shown in FIG. DETAILED DESCRIPTION OF THE INVENTION

[0011] An embodiment of the present invention will be described below with reference to the drawings. A fluid transfer device according to one embodiment of the present invention transfers sediment collected by a dust collector installed in a pumping station. The pumping station is a solid-liquid separation facility installed in a wastewater treatment facility. It settles sand contained in wastewater, such as sewage and rainwater, moves the settled sand to a sand collection pit to remove it from the wastewater, and then pumps the sand-removed wastewater.

[0012] Fig. 1 is a plan view schematically showing a pumping station and a fluid transfer device, and Fig. 2 is a cross-sectional view schematically showing the pumping station and the fluid transfer device shown in Fig. 1.

[0013] The pumping station 9 shown in FIG. 1 includes an inlet channel 91, two settling basins 93, 93 where sand settles, and a pump well 95. The pumping station 9 has a rectangular shape in plan view. The inlet channel 91 receives wastewater, such as sewage and rainwater, from the left end in FIG. 1. The wastewater received by the inlet channel 91 is distributed to two settling basins 93, 93. The two settling basins 93, 93 are located in the midstream portion of the pumping station 9, parallel to the direction of the wastewater flow. Because the two settling basins 93, 93 have the same configuration, the following description may refer to the settling basins 93 without distinguishing between them. The wastewater slowly flows toward the pump well 95, allowing sand mixed in the wastewater to settle in the settling basin 93. The bottom of the settling basin 93 forms a sand pool where sand accumulates. The two settling basins 93, 93 are connected to the same pump well 95. Sewage that has passed through the settling basin 93 flows into the pump well 95. The pump well 95 stores the sewage from which sand has been removed in the settling basin 93. A lifting pump P2 is installed inside the pump well 95. The sewage pumped by the lifting pump P2 is sent to a sedimentation basin (not shown) for the next stage of sewage treatment.

[0014] The settling basin 93 is a rectangular pond in plan view with walls on all four sides. The long sides of the settling basin 93 coincide with the long sides of the pumping station 9. The settling basin 93 includes a sand collection pit 931, a trough 933, and a dust collector 935. In the settling basin 93, the sand collection pit 931 is located upstream of the sewage flow. The sand collection pit 931 is provided with a sand lifting pump P1 for transporting sand therein out of the pumping station 9. When the sand lifting pump P1 is driven, sand accumulated at the bottom of the sand collection pit 931 is sucked in together with the sewage and sent to a sedimentation separator (not shown). The trough 933 extends from the bottom of the settling basin 93 toward the sand collection pit 931 along the long sides of the settling basin 93. The trough 933 is located in the center of the settling basin 93 in the width direction, downstream of the sand collection pit 931 in the flow of wastewater, and opens upward. The ends of the trough 933 are connected to the sand collection pit 931. The bottom of the settling basin 93 on both sides of the trough 933 in the width direction of the basin is configured with an inclined surface that slopes downward from the side wall of the settling basin 93 toward the trough 933. The inclined surface connects to the trough 933 at the bottom. Sand mixed in the wastewater that flows into the settling basin 93 settles toward the bottom of the settling basin 93, some of which deposits in the sand collection pit 931, and the rest slides down the inclined surface or deposits directly in the trough 933. The sand that deposits in the trough 933 is collected in the sand collection pit 931 by a sand collection device (not shown).

[0015] The dust remover 935 is provided at the most upstream portion of the flow of wastewater in the settling basin 93. The dust remover 935 is intended to remove screen residue, which is a contaminant mixed in the wastewater that has flowed into the settling basin 93, from the settling basin 93. When the wastewater that has flowed into the settling basin 93 passes through the dust remover 935, the screen residue mixed in the wastewater is intercepted by the dust remover 935. When the dust remover 935 is driven, the screen residue intercepted by the dust remover 935 is lifted above the settling basin 93 by a rake 9351 provided on the dust remover 935 and is then thrown into the fluid transfer device 1, as indicated by the downward arrow with an arc in FIG. 2 .

[0016] The fluid transfer device 1 transfers the screened residue input from the dust collector 935. The screened residue is then transferred to the separator 3 together with transfer water. As shown in FIG. 1, two fluid transfer devices 1 are provided, one for each settling basin 93. The two fluid transfer devices 1, 1 have the same configuration except for the common main pipe 14, and therefore, in the following description, the two fluid transfer devices 1, 1 may be described without distinguishing between them. In addition to the main pipe 14, each fluid transfer device 1 is equipped with a transfer device main body 11, a transfer water supply pipe 12, and a delivery pipe 13. The configuration of the transfer device main body 11 will be described in detail later.

[0017] The transfer water supply pipe 12 supplies transfer water to the transfer device main body 11. The transfer water supply pipe 12 is simplified and indicated by a thick solid line in FIG. 1 . This transfer water supply pipe 12 corresponds to an example of a transfer means. The transfer water is treated water in an aeration tank or a final sedimentation tank downstream of the pumping station 9. The transfer water is pumped up by a pump in the aeration tank or the final sedimentation tank and sent to the transfer water supply pipe 12. In FIG. 1 , the flow direction of the transfer water is indicated by a right-pointing arrow. The transfer water may be wastewater pumped up by the lifting pump P2 or purified water flowing through a water supply system. In this embodiment, the two transfer water supply pipes 12, 12 receive transfer water pumped up by a single pump. However, water may be sent from a different pump to each transfer water supply pipe 12. The transfer water supply pipe 12 is provided with an electric valve 121. Opening the electric valve 121 supplies the transfer water to the transfer device main body 11.

[0018] The delivery pipe 13 is a pipe that transfers the screen residue delivered together with the transfer water from the transfer device main body 11. The delivery pipe 13 provided in each fluid transfer device 1 is connected to a header pipe 14. The delivery pipe 13 and header pipe 14 are transfer pipes through which the screen residue delivered from the fluid transfer device 1 is transferred. As shown in FIG. 2, the header pipe 14 has an upwardly extending portion. However, the delivery pipe 13 may have an upwardly extending portion and the header pipe 14 may be arranged on the same horizontal plane, or the delivery pipe 13 and header pipe 14 may each have an upwardly extending portion. The delivery pipe 13 and header pipe 14 are simplified and shown by thick solid lines in FIG. 1. In the delivery pipe 13 of this embodiment, a gently bending bent pipe or a 45-degree elbow is used at the portion where the direction changes to prevent the screen residue from clogging. In FIG. 1, a 90-degree bend formed by combining two 45-degree elbows is shown on the left side, and a 90-degree bend using a vent pipe is shown on the right side. As shown in FIG. 2, the delivery pipe 13 is equipped with a check valve 131 and a drain pipe 132. The check valve 131 is installed immediately before the main pipe 14 to prevent backflow of mustard residue and transfer water from the main pipe 14. The drain pipe 132 is disposed in the delivery pipe 13 between the transfer device main body 11 and the check valve 131. The drain pipe 132 is used to drain transfer water remaining in the transfer space V2, which will be described later, from the transfer space V2. This drain pipe 132 corresponds to an example of a draining means. The drain pipe 132 is equipped with a drain valve 1321. By opening the drain valve 1321, the transfer water in the pipe on the transfer device main body 11 side of the delivery pipe 13 and the transfer water in the transfer space V2 are drained by gravity, emptying the transfer space V2. The end of the main pipe 14 opposite to the end connected to the delivery pipe 13 is arranged above the separator 3. The screened residue and transfer water that have passed through the delivery pipe 13 are fed into the separator 3 through the main pipe 14 as shown by the downward arrow in FIG. 2. The main pipe 14 may be omitted, and the delivery pipe 13 may be extended to the separator 3. If the main pipe 14 is omitted, it is preferable to also omit the check valve 1321. In the separator 3, the screened residue and water (mainly the transfer water) are separated, and the screened residue is fed into the hopper 4 shown in FIG. 2. The hopper 4 stores the screened residue, and when the stored screened residue reaches a predetermined amount, it discharges the residue into the bed of the truck T.The residue discharged from the hopper 4 is transported by truck T to an outside of the sewage treatment plant and then disposed of by incineration or other means.

[0019] Fig. 3(a) is a cross-sectional view showing the transfer device main body, and Fig. 3(b) is a cross-sectional view taken along line AA in Fig. 3(a). Fig. 3(a) is a cross-sectional view of the transfer device main body 11 as seen from the downstream side of the flow of wastewater in the grit basin.

[0020] As shown in FIG. 3(a), the transfer device main body 11 includes a receiving section 111 and a transfer space forming member 112. The receiving section 111 receives the screen residue discarded from the dust collector 935 (see FIG. 1). In this embodiment, the receiving section 111 includes a receiving section 101 and a cylindrical section 102. The receiving section 101 has a square funnel shape that widens in all directions as it extends upward. A detector 1011 for detecting the amount of screen residue is disposed in the lower portion of the receiving section 101. The cylindrical section 102 includes an outer cylinder 1021, an inner cylinder 1022, two gaskets 1023, a seal 1024, and a drive mechanism 1025. An upper opening 1021a extending in the axial direction is formed at the upper end of the outer cylinder 1021's circumferential surface. This upper opening 1021a is connected to the lower end of the receiving section 101. The outer cylinder 1021 and the receiving portion 101 may be integrally formed or may be joined by welding, for example. A lower opening 1021b extending in the axial direction is formed at the lower end of the outer cylinder 1021's circumferential surface. The lower opening 1021b has substantially the same shape as the upper opening 1021a. The lower opening 1021b and the upper opening 1021a are openings through which the sediment can flow. In this embodiment, the lower opening 1021b corresponds to an example of an outer cylinder flow port. The lower opening 1021b is connected to an opening formed at the upper end of the transfer space forming member 112, which has the transfer space V2 therein. In other words, when the inner cylinder 1022 is not present, the space within the outer cylinder 1021 is continuous with the space within the receiving portion 101 via the upper opening 1021a and is also continuous with the transfer space V2 via the lower opening 1021b. As shown in FIG. 3(a), both ends of the outer cylinder 1021 in the axial direction are closed except for a portion through which a drive shaft 1022c (described later) passes.

[0021] The inner cylinder 1022 is rotatably disposed inside the outer cylinder 1021. This inner cylinder 1022 corresponds to an example of a switching means. The inner cylinder 1022 is cylindrical and closed near both ends by two inner cylinder side plates 1022b, 1022b located near both ends in the axial direction. A drive shaft 1022c is fixed to one of the inner cylinder side plates 1022b. The central axis of this drive shaft 1022c coincides with the central axis of the inner cylinder 1022. A storage space V1 for temporarily storing screen residue is formed inside the inner cylinder 1022. The central axis of the inner cylinder 1022 coincides with the central axis of the outer cylinder 1021. In addition, an inner cylinder flow port 1022a, which is an opening extending in the axial direction, is formed on the circumferential surface of the inner cylinder 1022. The inner cylinder flow port 1022a is an opening through which screen residue can flow. The inner cylinder flow port 1022a is formed to be approximately the same size as the upper opening 1021a and the lower opening 1021b. When the inner cylinder 1022 is in the rotation position shown in Figures 3(a) and 3(b), the inner cylinder flow port 1022a is located at the upper end, and the inner cylinder flow port 1022a and the upper opening 1021a are connected to each other. In this state, the residue received by the receiving part 101 falls into the inner cylinder 1022 and is stored in the storage space V1. As shown in Figure 3(b), the inner cylinder flow port 1022a protrudes from the inner cylinder 1022 toward the outer cylinder 1021 to close the gap between the inner cylinder 1022 and the outer cylinder 1021. In Figures 3(a) and 3(b), the gap between the outer tube 1021 and the inner tube 1022 is drawn wide to make the outer tube 1021 and the inner tube 1022 easier to see, but in reality there is only a small gap between the outer tube 1021 and the inner tube 1022.

[0022] As shown in FIG. 3(a), two gaskets 1023, 1023 are attached to the entire outer circumferential surface of the inner cylinder 1022 at both axial ends of the inner cylinder 1022. The gaskets 1023 seal the gap between the outer cylinder 1021 and the inner cylinder 1022 at both axial ends of the inner cylinder 1022 to prevent fluid from passing through the gap and moving in the axial direction. The seal 1024 selectively closes the upper opening 1021a and the lower opening 1021b of the outer cylinder 1021. FIGS. 3(a) and 3(b) show the lower opening 1021b closed by the seal 1024. The seal 1024 is a sheet-like member slightly larger than the upper opening 1021a and the lower opening 1021b, and is attached to the outer circumferential surface of the inner cylinder 1022, on the side opposite the circumferential surface on which the inner cylinder flow port 1022a is formed. The drive mechanism 1025 is fixed to the drive shaft 1022c. A drive force is transmitted from a motor (not shown) to the drive mechanism 1025. When the drive force is transmitted to the drive mechanism 1025, the inner cylinder 1022 rotates around its central axis.

[0023] The transfer space forming member 112 is cylindrical and has a bottom, and includes a forming member side plate 1121 to which the tip of the transfer water supply pipe 12 is fixed. The end of the transfer space forming member 112 opposite the forming member side plate 1121 is connected to the delivery pipe 13. The transfer space forming member 112 defines a transfer space V2. Sediment stored in the storage space V1 flows into the transfer space V2. The transfer space V2 has a volume equal to or greater than the volume of the storage space V1. The tip of the transfer water supply pipe 12 penetrates the forming member side plate 1121 and protrudes into the transfer space V2. An outlet 12a for discharging the transfer water is formed at the tip of the transfer water supply pipe 12. Therefore, the outlet 12a is located in the transfer space V2. In FIG. 3(a), the discharge direction of the transfer water is indicated by a left-pointing arrow. The tip of the transfer water supply pipe 12 is formed by flattening a circular pipe, so the discharge port 12a has a flat shape that is flattened in the height direction and expanded in the width direction. In the shut-off state described below, the transfer water is discharged from the discharge port 12a, and the screened residue in the transfer space V2 is sent into the delivery pipe 13. The flow of the transfer water further transports the screened residue through the delivery pipe 13 and the main pipe 14 to the separator 3. The flat shape of the discharge port 12a increases the flow rate and discharge pressure of the transfer water, thereby improving the ability to transfer the screened residue in the transfer space V2.

[0024] The outer cylinder 1021 is fixed to the transfer space forming member 112 at a position where its lower end portion is inserted into an opening formed at the upper end of the transfer space forming member 112. The transfer space forming member 112 and the outer cylinder 1021 may be integrally formed or may be joined by, for example, welding. In the state shown in Figures 3(a) and 3(b), the lower opening 1021b of the outer cylinder 1021 is closed by the seal 1024 of the inner cylinder 1022, so that the receiving section 111 and the transfer space V2 are in an isolated state. In this isolated state, the sediment in the transfer space V2 and the transfer water discharged into the transfer space V2 are prevented from moving toward the receiving section 111.

[0025] Figure 4(a) is a cross-sectional view showing the inner tube rotated 90 degrees counterclockwise from Figure 3(b), and Figure 4(b) is a cross-sectional view showing the inner tube rotated another 90 degrees counterclockwise from Figure 3(a).

[0026] As described above, the inner cylinder 1022 rotates about its axis by driving a motor (not shown). In the blocked state shown in FIG. 3(b), the receiving section 111 and the transfer space V2 are blocked, and the residue introduced into the receiving section 101 is stored in the storage space V1. As shown in FIG. 4(a), when the inner cylinder 1022 rotates a certain distance from the blocked state shown in FIG. 3(b), the storage space V1 and the receiving section 101 are blocked, and the residue introduced into the receiving section 101 cannot fall from the receiving section 101 into the storage space V1. Furthermore, as shown in FIG. 4(b), when the inner cylinder 1022 rotates 180 degrees from the blocked state shown in FIG. 3(b), the inner cylinder flow port 1022a reaches its lower end, and the positions of the inner cylinder flow port 1022a and the lower opening 1021b of the outer cylinder 1021 are aligned, resulting in a flow state in which the storage space V1 and the transfer space V2 are connected. When part of the inner cylinder flow port 1022a and part of the lower opening 1021b overlap, the storage space V1 and the transfer space V2 are connected and in a flow-through state, but by rotating the inner cylinder 1022 to a position where the entire inner cylinder flow port 1022a overlaps the lower opening 1021b, the screen residue in the storage space V1 can be smoothly flowed into the transfer space V2. Since the transfer space V2 has a volume equal to or larger than the volume of the storage space V1, when the flow-through state is reached, almost all of the screen residue stored in the storage space V1 flows into the transfer space V2 by its own weight.

[0027] Next, we will explain the transfer operation of this fluid transfer device 1. Figure 5 is a flowchart showing the operation of the fluid transfer device shown in Figure 1. In this example, the fluid transfer device 1 is operated in conjunction with the operation of the dust remover 935.

[0028] The operation of the fluid transfer device 1 is controlled by a control device (not shown). The operations in the flowchart shown in Fig. 5 are performed in response to commands from the control device. In this embodiment, the control device controls the dust remover 935 and the fluid transfer device 1 in conjunction with each other, so that the operation of the fluid transfer device 1 is started in accordance with the operation of the dust remover 935. However, the operation of the fluid transfer device 1 may be started manually using a switch or the like, or the operation of the fluid transfer device 1 may be started automatically upon detecting that seed residue has been introduced from the dust remover 935.

[0029] As shown in FIG. 5, the transfer operation of the fluid transfer device 1 begins with an initial operation (step S1). In the initial operation, the inner cylinder 1022 is rotated to the shutoff state shown in FIGS. 3(a) and 3(b). Furthermore, in the initial operation, if the motor-operated valve 121 is open, the motor-operated valve 121 is closed. Furthermore, the drain valve 1321 is temporarily opened to drain the transfer water in the pipe on the transfer device main body 11 side of the delivery pipe 13 relative to the check valve 131 and the transfer water in the transfer space V2 from the drain pipe 132, and then the drain valve 1321 is closed. This drainage operation in the initial operation corresponds to an example of a drainage step. If there is no transfer water in the transfer space V2, the drain valve 1321 may simply be closed without being opened. In other words, if the transfer space V2 has been drained at the end of the previous transfer operation, the drainage step has already been performed, and therefore the drainage operation in the initial operation may be omitted. In the shutoff state, the residue received by the receiving unit 111 from the dust remover 935 is stored in the storage space V1. When the detection device 1011 detects that the amount of residue in the storage space V1 has reached a predetermined amount or more (YES in step S2), the inner cylinder 1022 is rotated until the inner cylinder flow port 1022a reaches the bottom, establishing a flow state in which the storage space V1 and the transfer space V2 are connected, thereby allowing the residue received by the receiving unit 111 to flow into the transfer space V2 (step S3). Note that, instead of detecting that the amount of residue in the storage space V1 has reached a predetermined amount or more in step S2, the receiving unit 111 may detect that a certain period of time has elapsed, and execute step S3 every time the certain period of time has elapsed. This step S3 corresponds to an example of an inflow process.

[0030] Once the screened residue has flowed into the transfer space V2, the inner cylinder 1022 is rotated until the inner cylinder flow port 1022a reaches the upper end, creating a blocked state in which the receiving section 111 and the transfer space V2 are blocked (step S4). This step S4 corresponds to an example of a blocking step. Next, the motor-operated valve 121 is opened to discharge the transfer water from the discharge port 12a, and the screened residue in the transfer space V2 is transferred to the separator 3 through the delivery pipe 13 and the main pipe 14. Once the transfer of the screened residue in the transfer space V2 is complete, the motor-operated valve 121 is closed to stop the discharge of the transfer water (step S5). This step S5 corresponds to an example of a transfer step. When the transfer in step S5 is complete, the transfer water remains in the delivery pipe 13 and the transfer space V2. Next, the drain valve 1321 is opened to drain the transfer water in the pipe on the transfer device main body 11 side of the check valve 131 of the delivery pipe 13 and the transfer water in the transfer space V2 through the drain pipe 132, and when the drainage is complete, the drain valve 1321 is closed (step S6). This step S6 corresponds to an example of a draining process. If the dust remover 935 has not stopped (NO in step S7), the process returns to step S2, and the operations of steps S2 to S6 are repeated. If the dust remover 935 has stopped (YES in step S7), the transfer operation is terminated. Note that while the operating time of the dust remover 935 is generally several hours, the operation time per cycle of steps S2 to S7 is only a few minutes, so once the transfer operation has started, the operations of steps S2 to S7 are repeatedly executed multiple times.

[0031] According to this embodiment, the drained screened residue is introduced into the transfer space V2, allowing the screened residue to be transferred by the transfer water regardless of its specific gravity. Furthermore, since steps S2 to S6 are repeatedly performed while the dust collector 935 is operating, the screened residue received by the receiver 111 can be transferred sequentially by the volume of the storage space V1. This allows the receiver 111 to be made more compact. Furthermore, the cylindrical portion 102 of the receiver 111 is provided with an outer tube 1021 and an inner tube 1022, and the inner tube 1022 is rotated to switch between the connected and disconnected states. This allows the fluid transfer device 1 to be manufactured at low cost. Furthermore, since the screened residue is transferred within the delivery pipe 13 and the main pipe 14, there is no risk of odor leakage during transfer. Furthermore, since the screened residue can be transferred upward, the height of the dust collector 935 can be reduced. As a result, the cost of the dust collector 935 is reduced, allowing the entire pumping station 9 in which the fluid transfer device 1 is installed to be constructed at low cost. Furthermore, the driving force of the dust collector 935 for lifting the sediment to a high position is reduced, so the power consumption at the pump station 9 can also be reduced.

[0032] Next, we will explain modified examples of the fluid transfer device 1. In the following explanation, components with the same names as components explained so far will be explained using the same symbols used so far, and duplicate explanations may be omitted.

[0033] FIG. 6 is a plan view similar to FIG. 1, showing a schematic diagram of a modified pumping station and fluid transfer device.

[0034] The pumping station 9 shown in FIG. 6 differs from the pumping station 9 shown in FIG. 1 in that a flowing water trough 97 is provided. Also, the pumping station 9 shown in FIG. 1 differs in that only one fluid transfer device 1 is provided, which is shared by multiple dust collectors 935, rather than for each dust collector 935. As shown in FIG. 6, the flowing water trough 97 extends across the two settling basins 93, 93 in the width direction of the basins. The bottom surface of the flowing water trough 97 slopes downward toward the upper side in FIG. 6. A flowing water supply nozzle (not shown) is installed at the lower end of the flowing water trough 97 in FIG. 6, and flowing water is supplied from the flowing water supply nozzle. The supplied flowing water flows toward the upper side in FIG. 6. When the two dust collectors 935, 935 of the flowing water trough 97 are driven, the sediment lifted by each dust collector 935 is dumped into the flowing water trough 97. The screen residues placed in the flowing water trough 97 are carried downstream by the flowing water and poured together with the flowing water at the most downstream point into the receiving section 111 (see FIG. 3) of the transfer device main body 11. In this modified example, it is preferable that the receiving section 111 is provided with a drainage port for discharging the flowing water and leaving only the screen residues, or that a dehydrator is provided between the flowing water trough 97 and the receiving section 111 so that the screen residues from which the flowing water has been removed are placed into the receiving section 111.

[0035] The fluid transfer device 1 and pumping station 9 of this modified example not only have the same effects as the previous embodiment, but also have the effect of requiring only one fluid transfer device 1. However, as described above, it is necessary to separate the flowing water and the sediment either at the fluid transfer device 1 itself or before the fluid transfer device 1. In addition, there is a risk that odors generated from the sediment may leak from the flowing water trough 97.

[0036] Next, a description will be given of the fluid transfer device 1 of the second embodiment. Figure 7(a) is a cross-sectional view of the fluid transfer device of the second embodiment similar to Figure 3(a), and Figure 7(b) is a cross-sectional view taken along line BB of Figure 3(a).

[0037] The transfer device main body 11 shown in FIG. 7 differs from the transfer device main body 11 shown in FIG. 3 in that an outer cylinder 1021 is disposed in the portion where the transfer space forming member 112 was disposed in the fluid transfer device 1 shown in the previous embodiment, and an inner cylinder 1022 forms the transfer space V2. In addition, in this second embodiment, the receiving portion 111 is composed only of the receiving portion 101, and the cylindrical portion 102 is not a component of the receiving portion 111. Note that in FIG. 7 and FIG. 8 (described later), the gap between the outer cylinder 1021 and the inner cylinder 1022 is shown wide to make the outer cylinder 1021 and the inner cylinder 1022 easier to see, but in reality, only a very small gap exists between the outer cylinder 1021 and the inner cylinder 1022. As shown in FIGS. 7(a) and 7(b), the downstream end of the outer cylinder 1021 in the discharge direction of the transfer water is open, and the delivery pipe 13 is connected to the downstream end. An upper opening 1021a extending in the axial direction is formed at the upper end portion of the circumferential surface of the outer cylinder 1021. The upper opening 1021a in this embodiment corresponds to an example of an outer cylinder flow port. The inner cylinder 1022 is rotatably disposed within the outer cylinder 1021. The inner cylinder 1022 is a cylindrical body with a bottom, an open downstream end in the discharge direction of the transfer water, and an inner cylinder side plate 1022b to which the tip of the transfer water supply pipe 12 is fixed at its upstream end in the discharge direction of the transfer water. The space within the inner cylinder 1022 serves as both a storage space V1 and a transfer space V2. Hereinafter, in the description of this second embodiment, the space serving as both the storage space V1 and the transfer space V2 will be simply referred to as the transfer space V2. An inner cylinder flow port 1022a, which is an opening extending in the axial direction, is formed at the circumferential surface of the inner cylinder 1022. This inner cylinder flow port 1022a is formed in approximately the same shape as the upper opening 1021a of the outer cylinder 1021. A drive mechanism 1025 is fixed to the upstream end portion of the inner cylinder 1022 in the discharge direction of the transferred water. When the drive mechanism 1025 is driven to rotate the inner cylinder 1022, the state is switched between a connected state and a disconnected state. The inner cylinder 1022 in this embodiment corresponds to an example of a switching means and also corresponds to an example of a transfer space forming member.

[0038] Figure 8(a) is a CC cross-sectional view of Figure 7 showing the fluid transfer device in a flowing state, (b) is a CC cross-sectional view showing the fluid transfer device in a blocked state after the inner tube has been rotated 180 degrees from Figure 8(a), and (c) is a CC cross-sectional view showing the fluid transfer device in a blocked state after the inner tube has been rotated 50 degrees from Figure 8(a). Note that the background is omitted in Figure 8.

[0039] As shown in FIG. 8(a), in the flow-through state, the inner tube flow port 1022a of the inner tube 1022 is located at the upper end of the inner tube 1022, and the inner tube flow port 1022a and the upper opening 1021a of the outer tube 1021 are connected to each other. In this flow-through state, the screened residue received by the receiving section 111 (receiving section 101) falls into the inner tube 1022 and accumulates in the transfer space V2. As shown in FIG. 8(b), in the blocked state where the inner tube 1022 is rotated 180 degrees from the flow-through state, the receiving section 111 and the transfer space V2 are blocked. In this blocked state, transfer water is discharged from the discharge port 12a, and the screened residue in the transfer space V2 is sent into the delivery pipe 13. The flow of the transfer water further transports the screened residue to the separator 3 through the delivery pipe 13 and the main pipe 14 shown in FIG. 1. In the blocked state, the residue received by the receiving section 111 is temporarily stored in the receiving section 101 above the inner tube 1022. In FIG. 8(b), the inner tube 1022 is rotated 180 degrees from the flow-through state to the blocked state, but the blocked state may also be achieved by rotating the inner tube 1022 to such an extent that the inner tube flow port 1022a and the upper opening 1021a are misaligned. FIG. 8(c) shows an example in which the inner tube 1022 is rotated 50 degrees from the flow-through state to the blocked state. By reducing the rotation angle in this way, the time required to switch between the flow-through state and the blocked state can be shortened, and the amount of power consumed when switching between the flow-through state and the blocked state can also be reduced.

[0040] According to the fluid transfer device 1 of the second embodiment, in addition to the same effects as the previous embodiment, the structure of the transfer device main body 11 is simplified, so that the transfer device main body 11 can be constructed inexpensively.

[0041] Next, a third embodiment of the fluid transfer device 1 will be described. Fig. 9(a) is a cross-sectional view similar to Fig. 3(b) showing the transfer device main body of the third embodiment in a blocked state, Fig. 9(b) is a cross-sectional view showing the state in which the inner cylinder has rotated from Fig. 3(a) to enter a first flow state, and Fig. 9(c) is a cross-sectional view showing the state in which the inner cylinder has rotated from Fig. 3(a) to enter a second flow state.

[0042] The fluid transfer device of the third embodiment differs from the fluid transfer device 1 shown in FIG. 1 in that the transfer device main body 11 is provided with two transfer space forming members, a first transfer space forming member 112A and a second transfer space forming member 112B, and that a seal 1024 is attached to substantially the entire outer periphery of the inner cylinder 1022, except for the portion where the inner cylinder flow port 1022a is formed. As shown in FIG. 9(a), a first lower opening 1021bA and a second lower opening 1021bB extending in the axial direction are formed in the lower portion of the outer cylinder 1021. In this embodiment, the first lower opening 1021bA and the second lower opening 1021bB correspond to examples of outer cylinder flow ports. The first lower opening 1021bA and the second lower opening 1021bB have substantially the same shape as the upper opening 1021a. The first lower opening 1021bA is connected to an opening formed in the upper portion of the first transfer space forming member 112A. The second lower opening 1021bB is connected to an opening formed in the upper portion of the second transfer space forming member 112B. That is, without the inner cylinder 1022, the space inside the outer cylinder 1021 is continuous with the first transfer space V2A formed by the first transfer space forming member 112A and the second transfer space V2B formed by the second transfer space forming member 112B. In this third embodiment, the tip end portion of the transfer water supply pipe 12 branches into two, forming a first branch supply pipe 12A and a second branch supply pipe 12B. A first motor-operated valve (not shown) is disposed in the first branch supply pipe 12A, and a second motor-operated valve (not shown) is disposed in the second branch supply pipe 12B. The tip end portion of the first branch supply pipe 12A protrudes into the first transfer space V2A. A first discharge port 12Aa is formed at the tip end of the first branch supply pipe 12A. The tip of the second branch supply pipe 12B protrudes into the second transfer space V2B. A second discharge port 12Ba is formed at the tip of the second branch supply pipe 12B. Although not shown, a first delivery pipe is connected to the first transfer space forming member 112A, and a first drain pipe with a first drain valve and a first check valve are provided in this first delivery pipe, in that order from the upstream side in the flow of the transfer water. Similarly, a second delivery pipe is connected to the second transfer space forming member 112B, and a second drain pipe with a second drain valve and a second check valve are provided in this second delivery pipe, in that order from the upstream side in the flow of the transfer water.Although the gap between the outer cylinder 1021 and the inner cylinder 1022 is depicted as being large in FIG. 9, in reality, there is only a small gap between the outer cylinder 1021 and the inner cylinder 1022.

[0043] In the blocked state shown in FIG. 9(a), the inner cylinder flow port 1022a of the inner cylinder 1022 is located at the upper end, and the inner cylinder flow port 1022a and the upper opening 1021a are connected to each other. In this blocked state, the screen residue received by the receiving portion 101 falls into the inner cylinder 1022 and is stored in the storage space V1. In this blocked state, the first transfer space V2A and the second transfer space V2B are blocked from the receiving portion 111. In the first flow state shown in FIG. 9(b), the position of the inner cylinder flow port 1022a of the inner cylinder 1022 and the position of the first lower opening 1021bA are aligned, and the storage space V1 and the first transfer space V2A are connected to each other. In this first flow state, the screen residue stored in the storage space V1 flows into the first transfer space V2A by its own weight. 9(c), the position of the inner cylinder flow port 1022a of the inner cylinder 1022 coincides with the position of the second lower opening 1021bB, and the storage space V1 and the second transfer space V2B are continuous. In this second flow state, the sediment stored in the storage space V1 flows into the second transfer space V2B by its own weight.

[0044] FIG. 10 is a flowchart showing the operation of the fluid transfer device shown in FIG.

[0045] As shown in FIG. 10, when the transfer operation is started, an initial operation is first performed (step S11). In the initial operation, the inner cylinder 1022 is rotated to the shutoff state shown in FIG. 9(a). In the initial operation, the first electric valve provided on the first branch supply pipe 12A and the second electric valve provided on the second branch supply pipe 12B are closed. In addition, the first drain valve and the second drain valve are temporarily opened to drain the transfer water in the first transfer space V2A and the second transfer space V2B, etc., and then the first drain valve and the second drain valve are closed. This drainage operation in the initial operation corresponds to an example of a drainage process. Note that if the first transfer space V2A and the second transfer space V2B were drained at the end of the previous transfer operation, the drainage operation in the initial operation may be omitted. In the shutoff state, the screen waste introduced from the dust collector 935 (see FIG. 1) is stored in the storage space V1. When the detector 1011 detects that the amount of residue in the storage space V1 has reached a predetermined amount (YES in step S12), it is determined whether a first transfer process (described later) is being executed (step S13). If the first transfer process is not being executed (NO in step S13), the first transfer process is started (step S17). If the first transfer process is being executed (YES in step S13), it is determined whether a second transfer process (described later) is being executed (step S14). If the second transfer process is being executed (YES in step S14), the process returns to step S13, and the determinations in steps S13 and S14 are repeated until the first transfer process or the second transfer process is completed. If the second transfer process is not being executed (NO in step S14), the second transfer process is started (step S15). After the second transfer process is started in step S15 or after the first transfer process is started in step S17, it is determined whether the dust remover 935 is stopped (step S16). If the dust remover 935 is not stopped (NO in step S16), the process returns to step S12. If the dust remover 935 is stopped (YES in step S16), the transfer operation ends after the first transfer process or second transfer process currently being executed is completed.

[0046] In the first transfer process, the inner cylinder 1022 is rotated until the positions of the inner cylinder flow port 1022a and the first lower opening 1021bA are aligned, creating a first flow state in which the storage space V1 and the first transfer space V2A are connected, allowing the screen residue received by the receiving unit 111 to flow into the first transfer space V2A (step S171). This step S171 corresponds to an example of an inflow process. Note that this rotation of the inner cylinder 1022 is performed counterclockwise in FIG. 9 so that the positions of the inner cylinder flow port 1022a and the second lower opening 1021bB do not coincide during rotation. Once the screen residue has flowed into the first transfer space V2A, the inner cylinder 1022 is rotated until the inner cylinder flow port 1022a is at the top, creating a blocked state in which the receiving unit 111 and the first transfer space V2A are blocked (step S172). This step S172 corresponds to an example of a blocking process. The rotation of the inner cylinder 1022 is performed clockwise in FIG. 9 so that the position of the inner cylinder flow port 1022a and the position of the second lower opening 1021bB do not coincide during rotation. Next, the first motor-operated valve provided on the first branch supply pipe 12A is opened to discharge the transfer water from the first discharge port 12Aa, and the screened residue in the first transfer space V2A is transferred to the separator 3 through the first delivery pipe and the main pipe 14 (see FIG. 1). When the transfer of the screened residue in the first transfer space V2A is completed, the first motor-operated valve is closed to stop the discharge of the transfer water (step S173). This step S173 corresponds to an example of a transfer process. When the transfer in step S173 is completed, the transfer water remains in the first delivery pipe and the first transfer space V2A. Next, the first drain valve is opened, and the transfer water in the pipe on the transfer device main body 11 side of the first delivery pipe relative to the first check valve and the transfer water in the first transfer space V2A is drained, and when the draining is complete, the first drain valve is closed (step S174). This step S174 corresponds to an example of a draining step. This completes the first transfer process.

[0047] In the 21st transfer process, the inner cylinder 1022 is rotated until the positions of the inner cylinder flow port 1022a and the second lower opening 1021bB are aligned, creating a second flow state in which the storage space V1 and the second transfer space V2B are connected, allowing the screen residue received by the receiving unit 111 to flow into the second transfer space V2B (step S151). This step S151 corresponds to an example of an inflow process. Note that this rotation of the inner cylinder 1022 is performed clockwise in FIG. 9 so that the positions of the inner cylinder flow port 1022a and the first lower opening 1021bA do not coincide during rotation. Once the screen residue has flowed into the second transfer space V2B, the inner cylinder 1022 is rotated until the inner cylinder flow port 1022a is at the top, creating a blocked state in which the receiving unit 111 and the second transfer space V2B are blocked (step S152). This step S152 corresponds to an example of a blocking process. The rotation of the inner cylinder 1022 is performed counterclockwise in FIG. 9 so that the position of the inner cylinder flow port 1022a and the position of the first lower opening 1021bA do not coincide during rotation. Next, the second electric valve provided on the second branch supply pipe 12B is opened to discharge the transfer water from the second discharge port 12Ba, and the screened residue in the second transfer space V2B is transferred to the separator 3 through the second delivery pipe and the main pipe 14 (see FIG. 1). When the transfer of the screened residue in the second transfer space V2B is completed, the second electric valve is closed to stop the discharge of the transfer water (step S153). This step S153 corresponds to an example of a transfer process. When the transfer in step S153 is completed, the transfer water remains in the second delivery pipe and the second transfer space V2B. Next, the second drain valve is opened to drain the transfer water in the second delivery pipe on the transfer device main body 11 side of the second check valve and the transfer water in the second transfer space V2B, and when the draining is complete, the second drain valve is closed (step S154). This step S154 corresponds to an example of a draining step. This completes the second transfer process.

[0048] According to the fluid transfer device 1 of the third embodiment, in addition to the same effects as those of the previous embodiment, the transfer process is performed at different times in the first transfer space forming member 112A and the second transfer space forming member 112B, so the amount of screen residue transferred can be increased, thereby achieving the effect of allowing a larger amount of screen residue to be received by the transfer device main body 11.

[0049] Next, a description will be given of a fluid transfer device 1 according to a fourth embodiment. Fig. 11 is a view of the transfer device main body according to the fourth embodiment, seen from the downstream side to the upstream side of the flow of wastewater in the settling basin.

[0050] The fluid transfer device 1 shown in FIG. 11 receives screen residue from the dust collectors 935 installed in the two settling basins 93 shown in FIG. 1 and transfers it by flowing it into a common transfer space V2. As shown in FIG. 11, the fluid transfer device 1 includes two receivers 111, a transfer space forming member 112, a transfer water supply pipe 12, an outlet pipe 13, and a drain pipe 132. The receiver 111 receives screen residue from the dust collectors 935. Since the two receivers 111 have the same configuration, the following description may refer to the two receivers 111 without distinguishing between them. In this embodiment, the receiver 111 includes a receiver 101, a storage pipe 103, an electric switching valve 104, and a cleaning pipe 105. The receiver 111 receives screen residue from the dust collectors 935 (see FIG. 1). The receiving section 101 has a rectangular funnel shape that widens in a direction perpendicular to the plane of the paper in FIG. 11 as it extends upward. The storage tube 103 has a bottomed cylindrical shape and a storage side plate 1031 to which the tip of the cleaning tube 105 is fixed. The interior of this storage tube 103 forms the storage space V1. The screen waste discharged from the dust collector 935 passes through the receiving section 101 and is temporarily stored in the storage space V1. A switching motor-operated valve 104 is disposed at the end of the storage tube 103 opposite the storage side plate 1031. The switching motor-operated valve 104 switches between a connected state in which the transfer space V2 formed by the transfer space-forming member 112 is connected to the receiving section 111, and a blocked state in which the receiving section 111 is blocked from the transfer space V2. The connected state is achieved by opening the switching motor-operated valve 104, and the blocked state is achieved by closing the switching motor-operated valve 104. This switching motor-operated valve 104 corresponds to an example of a switching means. The cleaning pipe 105 supplies cleaning water to the storage space V1. A cleaning water supply valve 1051 is provided in the cleaning pipe 105. This cleaning water supply valve 1051 is composed of a valve that is electrically opened and closed. By opening the cleaning water supply valve 1051, cleaning water is supplied to the storage space V1, and by closing the cleaning water supply valve 1051, the supply of cleaning water stops.

[0051] The transfer space forming member 112 is cylindrical, with one end connected to the transfer water supply pipe 12 and the other end connected to the drain pipe 132. The transfer space forming member 112 includes a space forming member main pipe 1120, a first branch pipe 1123, a first connecting pipe 1124, a second branch pipe 1125, a second connecting pipe 1126, and a third branch pipe 1127. A transfer space V2 is defined by the transfer space forming member 112. Screen residue stored in the storage space V1 flows into this transfer space V2 along with cleaning water. The transfer space V2 is a space with a volume equal to or greater than the volume of the storage space V1. The space forming member main pipe 1120 is a pipe extending horizontally. The first branch pipe 1123 is a Y-shaped pipe attached to the left end of the space forming member main pipe 1120 in FIG. 11. The first connecting pipe 1124 extends from the branching point of the first branch pipe 1123 to the motor-operated switching valve 104 of the receiving section 111 on the left side in FIG. 11. This first connecting pipe 1124 is a pipe having a 45-degree elbow shape just before the motor-operated switching valve 104. The second branch pipe 1125 is a Y-shaped pipe attached to the right end of the space forming member main pipe 1120 in FIG. 11. The second connecting pipe 1126 extends from the branching point of the second branch pipe 1125 to the motor-operated switching valve 104 of the receiving section 111 on the right side in FIG. 11. This second connecting pipe 1126 is a pipe having a 45-degree elbow shape just before the motor-operated switching valve 104. The third branch pipe 1127 is a Y-shaped pipe connected to the second connecting pipe 1126, the delivery pipe 13, and the drain pipe 132.

[0052] The transfer water supply pipe 12 supplies transfer water to the transfer space forming member 112. An electric valve 121 is provided in the transfer water supply pipe 12. By opening this electric valve 121, transfer water is supplied to the transfer space forming member 112. In Figure 11, the flow direction of the transfer water is indicated by a right-pointing arrow. In the shut-off state, transfer water is discharged from the transfer water supply pipe 12, and the screen residue and cleaning water in the transfer space V2 are sent into the delivery pipe 13.

[0053] The delivery pipe 13 is a pipe that transfers the screen residue that is delivered together with the transfer water and cleaning water from the transfer space forming member 112. As shown in FIG. 11, the delivery pipe 13 extends upward from the third branch pipe 1127 of the transfer space forming member 112, and its tip is inserted into the separator 3 (see FIG. 2). The screen residue, cleaning water, and transfer water that pass through the delivery pipe 13 are transferred to the separator 3. To prevent the delivery pipe 13 from becoming clogged with screen residue, a 45-degree elbow or a bent pipe is used at the point where the direction changes.

[0054] The drain pipe 132 is for emptying the transfer space V2. A drain valve 1321 is provided on the drain pipe 132. By opening the drain valve 1321, the transfer water remaining in the transfer space V2 and the delivery pipe 13 is drained.

[0055] Next, a description will be given of the transfer operation in the fluid transfer device 1 of the fourth embodiment. Figure 12 is a flowchart showing the operation of the fluid transfer device shown in Figure 11.

[0056] As shown in FIG. 12, when the transfer operation is started, an initial operation is first performed (step S21). In the initial operation, the motor-operated switching valve 104, the cleaning water supply valve 1051, and the motor-operated valve 121 are closed. Furthermore, the drain valve 1321 is temporarily opened to drain the transfer water in the transfer space V2 and the delivery pipe 13, and then the drain valve 1321 is closed. This drain operation in the initial operation corresponds to an example of a draining step. Note that if the transfer space V2 was drained at the end of the previous transfer operation, the drain operation in the initial operation may be omitted. Closing the motor-operated switching valve 104 puts the fluid transfer device 1 into a shutoff state. In the shutoff state, the residue received by the receiving section 111 is stored in the storage space V1. When the detector 1011 of either of the two receivers 111 detects that the amount of residue in the storage space V1 has reached a predetermined amount (YES in step S22), it is determined whether the residue is being transferred or the transfer water is being drained (step S23). Whether the residue is being transferred or the transfer water is being drained can be determined by whether the motor-operated valve 121 or the drain valve 1321 is open. If the residue is not being transferred or the transfer water is not being drained (NO in step S23), the motor-operated switching valve 104 is opened to connect the receiver 111 and the transfer space V2 to a circulating state (step S24). Then, the cleaning water supply valve 1051 is opened to supply cleaning water into the storage pipe 103, and the cleaning water flushes the residue stored in the storage space V1 and flows into the transfer space V2 (step S25). These steps S24 and S25 correspond to an example of a flow-in process.

[0057] When the screened residue flows into the transfer space V2, the switching motor valve 104 is closed to isolate the transfer space V2 from the receiving section 111 (step S26). This step S26 corresponds to an example of a blocking step. Next, it is confirmed that both switching motor valves 104 provided in the two receiving sections 111, 111 are closed. If they are closed (YES in step S27), the motor valve 121 is opened to discharge the transfer water from the discharge port 12a, and the screened residue in the transfer space V2 is transferred to the separator 3 through the delivery pipe 13. When the transfer of the screened residue in the transfer space V2 is completed, the motor valve 121 is closed to stop the discharge of the transfer water (step S28). This step S28 corresponds to an example of a transfer step. When the transfer in step S28 is completed, the transfer water remains in the delivery pipe 13 and the transfer space V2. Next, the drain valve 1321 is opened to drain the transfer water remaining in the delivery pipe 13 and the transfer space V2 through the drain pipe 132, and when the drainage is complete, the drain valve 1321 is closed (step S29). This step S29 corresponds to an example of a drainage step. Thereafter, if the dust remover 935 (see FIG. 1) has not stopped (NO in step S30), the process returns to step S22, and the operations of steps S22 to S29 are repeated. If the dust remover 935 has stopped (YES in step S30), the transfer operation is terminated.

[0058] According to the fluid transfer device 1 and the pumping station 9 of the fourth embodiment, in addition to the same effects as those of the previous embodiments, there is also an effect that only one fluid transfer device 1 is required for two dust removers 935.

[0059] Next, a modified example of the fluid transfer device 1 of the fourth embodiment shown in Fig. 11 will be described. In the description of this modified example, differences from the fourth embodiment will be mainly described, and the names of components that are the same as those described so far will be assigned the same reference numerals as used so far, and duplicated descriptions will be omitted.

[0060] FIG. 13 is a view similar to FIG. 11, showing a modification of the fluid transfer device shown in FIG.

[0061] The fluid transfer device 1 shown in FIG. 13 differs from the fluid transfer device 1 shown in FIG. 11 in that it does not have a second branch pipe 1125 or a second connecting pipe 1126, and both of the two receivers 111 are connected to a first connecting pipe 1124. As shown in FIG. 13, the transfer space forming member 112 includes a space forming member main pipe 1120, a first branch pipe 1123, a first connecting pipe 1124, and a third branch pipe 1127. A Y-shaped fourth branch pipe 1128 is provided on the first connecting pipe 1124. 45-degree elbows are attached to each of the three ends of the fourth branch pipe 1128. The first connecting pipe 1124 is connected to the first branch pipe 1123 and the motor-operated switching valves 104 of the two receivers 111, 111, with the fourth branch pipe 1128 at the center.

[0062] In addition to the same effects as those of the fourth embodiment, this modified fluid transfer device 1 also has the effect of reducing the cost of the fluid transfer device by omitting the second branch pipe 1125 and the second connecting pipe 1126.

[0063] The present invention is not limited to the above-described embodiment and various modifications can be made within the scope of the claims. For example, in the present embodiment, the fluid transfer device 1 is used in a pumping station 9 having two settling basins 93, 93. However, the fluid transfer device 1 may be used in a pumping station 9 having only one settling basin 93, or in a pumping station 9 having three or more settling basins 93. When the fluid transfer device 1 is used in a pumping station 9 having only one settling basin 93, it is preferable to omit the main pipe 14, extend the delivery pipe 13 to the separator 3, and omit the check valve 1321. In addition, in the present embodiment, the receiver 111 directly receives the screened residue from the dust remover 935. However, a crusher may be provided between the dust remover 935 and the receiver 111, and the crushed screened residue may be fed to the receiver 111. Furthermore, the drain pipe 132 may be located upstream in the transfer direction from the position where the screened residue flows in. This has the effect of preventing the transfer of screen residue from being hindered by the drain pipe 132. In addition, in each fluid transfer device 1 shown in Fig. 1, the check valve 131 may be omitted, and when one of the discharge ports 12a provided in each fluid transfer device 1 is discharging transfer water, the drain valves 1321 provided in the other fluid transfer devices 1 may be controlled to close.

[0064] According to the above-described embodiment and modified examples, the screen residue can be transported regardless of its specific gravity.

[0065] Note that even if a component is included only in the description of each of the above-described embodiments and modifications, that component may be applied to other embodiments or other modifications.

[0066] The transfer method of the fluid transfer device described above is a transfer method of a fluid transfer device provided with a receiving section that receives screen residue and a transfer space forming member that defines a transfer space into which the screen residue flows from the receiving section, an inflow process of causing the screen residue received by the receiving section to flow into the transfer space; an isolating step of isolating the transfer space into which the sediment has flowed from the receiving section; a transfer step of transferring screen residue in the transfer space by discharging transfer water into the transfer space in the blocked state; and a draining step of draining the transfer water remaining in the transfer space after the screen residue has been transferred from the transfer space, The inflow step is a step of connecting the transfer space from which the transfer water has been drained to the receiving section, and causing the screen residue received by the receiving section to flow into the transfer space.

[0067] The inflow step may be a step of allowing the residue in the receiving section to flow into the transfer space under its own weight. The blocking step may be a step of watertightly sealing the space between the receiving section and the transfer space. Furthermore, the draining step may be a step of draining the transfer water from the transfer space under its own weight.

[0068] According to the transfer method of this fluid transfer device, the screen residue can be caused to flow into the transfer space and transferred by the transfer water, regardless of the specific gravity of the screen residue.

[0069] In the transfer method for the fluid transfer device, the inflow step, the blocking step, the transfer step, and the drainage step may be steps that are repeatedly performed.

[0070] By repeating these steps, the residue received by the receiving section can be transferred sequentially. Also, the fluid transfer device can be made smaller.

[0071] Furthermore, in the transfer method of this fluid transfer device, the inflow process, the blocking process, the transfer process and the drainage process may be processes that are performed at different times for each of the plurality of transfer space forming members.

[0072] This increases the amount of screen residue that can be transported, making it possible to accept and transport even large amounts of screen residue.

[0073] The fluid transfer device described above includes a receiving section for receiving screen residue; a transfer space forming member that defines a transfer space into which the residue flows from the receiving portion; a switching means for switching a connection state between the receiving section and the transfer space between a flow-through state in which the receiving section and the transfer space are connected and a blocked state in which the receiving section and the transfer space are blocked; a transfer means for transferring the residue that has flowed into the transfer space from the receiving section in the circulating state by discharging transfer water into the transfer space in the blocked state; and a drainage means for draining the transfer water remaining in the transfer space after the sediment has been transferred from the transfer space. The switching means is characterized by connecting the transfer space from which the transferred water has been drained by the drainage means to the receiving section, thereby switching to the circulating state.

[0074] According to this fluid transfer device, the screen residue can be caused to flow into the transfer space and transferred by the transfer water, regardless of the specific gravity of the screen residue.

[0075] In this fluid transfer device, the switching means may be a rotatable inner cylinder arranged inside an outer cylinder having an outer cylinder flow port through which the screen residue can flow, and having an inner cylinder flow port through which the screen residue can flow, and the flow state and the blocked state may be switched by changing the relative positions of the outer cylinder flow port and the inner cylinder flow port by rotation.

[0076] According to this aspect, the transfer space forming member and the receiving portion can be switched between connected and disconnected states with a simple configuration, so that the fluid transfer device can be configured at low cost. The transfer method of the fluid transfer device described above is a transfer method of a fluid transfer device provided with a receiving section that receives screen residue and a transfer space forming member that defines a transfer space into which the screen residue flows from the receiving section, an inflow process of causing the screen residue received by the receiving section to flow into the transfer space; an isolating step of isolating the transfer space into which the sediment has flowed from the receiving section; a transfer step of discharging transfer water into the transfer space in the blocked state to transfer the screen residue in the transfer space, The flow-in step is characterized in that it is a step of connecting the transfer space and the receiving section and allowing the screen residue received by the receiving section to flow into the transfer space. The fluid transfer device described above includes a receiving section for receiving screen residue; a transfer space forming member that defines a transfer space into which the residue flows from the receiving portion; a switching means for switching a connection state between the receiving section and the transfer space between a flow-through state in which the receiving section and the transfer space are connected and a blocked state in which the receiving section and the transfer space are blocked; a transfer means for transferring the residue that has flowed into the transfer space from the receiving section in the circulating state by discharging transfer water into the transfer space in the blocked state; The switching means is characterized by connecting the transfer space and the receiving section to switch to the circulating state. Furthermore, the above-described transfer method of the fluid transfer device includes a cylindrical body having an opening extending in the axial direction, the cylindrical body having a receiving section for receiving screen residue, and a transfer space forming member for defining a transfer space into which screen residue flows from the receiving section, an inflow process of causing the screen residue received by the receiving section to flow into the transfer space; an isolating step of isolating the transfer space into which the sediment has flowed from the receiving section; a transfer step of discharging transfer water into the transfer space in the blocked state to transfer the screen residue in the transfer space, The flow-in step is characterized in that it is a step of connecting the transfer space and the receiving section, and allowing the screen residue received by the receiving section to flow into the transfer space through the opening. [Explanation of symbols]

[0077] 1 Fluid transfer device 12 Transfer water supply pipe (transfer means) 104 Electric switching valve (switching means) 111 Acceptance Department 112 Transfer space forming member 132 Drain pipe (drainage means) 1022 Inner cylinder (switching means) V2 Transfer space

Claims

[Claim 1] A receiving section having a cylindrical body with an opening extending in the axial direction, the receiving section receiving sediment in the cylindrical body; a transfer space forming member that defines a transfer space into which the residue flows from the receiving portion; a switching means for switching a connection state between the receiving section and the transfer space between a flow-through state in which the receiving section and the transfer space are connected and a blocked state in which the receiving section and the transfer space are blocked; a transfer means for transferring the residue that has flowed into the transfer space from the receiving section in the circulating state by discharging transfer water into the transfer space in the blocked state; the switching means connects the transfer space and the receiving section to switch to the circulating state, The fluid transfer device is characterized in that the receiving section allows the received residue to flow into the transfer space through the opening in the circulating state.

Images