JP7485353B2 - Method for transferring fluid and fluid transfer device - Google Patents

Description

The present invention relates to a method for transferring fluid using a fluid transfer device that includes a receiving section that receives screen residue and a transfer space forming member that defines a transfer space into which screen residue flows from the receiving section.

In sewage treatment facilities, the screens removed in a grit basin or the like are transported to a storage device using a transport device. Conventionally, belt conveyors have been used as the transport device, but belt conveyors have problems such as odor leakage and the difficulty of changing the transport direction without transferring to another belt conveyor. In addition, belt conveyors are installed above the ground surface because a space for maintenance must be provided below. In addition, when transferring to another belt conveyor, the screens are dropped downward at the rear end of each belt conveyor before transferring to the next belt conveyor, so when multiple belt conveyors are used, the first belt conveyor must be placed at a fairly high position. In this case, in order to transfer the screens from the dust collector to the first belt conveyor at a high position, a taller dust collector that can transport the screens to a high position is installed in the grit basin or the like. As a result, there is also the problem that the dust collector is expensive.

In response to this, in recent years, a fluid transfer device has been proposed as a transfer device that transfers screen residue in a pipe using transfer water (see, for example, Patent Document 1). The fluid transfer device in Patent Document 1 has a tank with an opening at the top end, a supply-side pipe connected to the tank, and a discharge-side pipe connected to the bottom end of the tank. After screen residue and water are poured into the tank through the opening, the top opening is closed, and transfer water is sent into the tank from the supply-side pipe. The attempt is made to transfer the screen residue stored in the tank by sending it to the discharge-side pipe using the water flow of the transferred water. With this fluid transfer device, there is little risk of odor leakage, and the transfer direction can be easily bent in the middle of the transfer path by bending the discharge-side pipe. Furthermore, this fluid transfer device can also transfer screen residue from a low position to a high position, which has the effect of eliminating the need to keep the dust collector high.

JP 2012-86987 A

However, there are many types of screen residue with different specific gravities, some of which rise to the surface, some that sink, and some that float in the water. What can be sent out from the discharge pipe of the fluid transfer device in Patent Document 1 is mainly the screen residue that sinks, and there is a risk that the screen residue that floats in particular cannot be sent out to the discharge pipe and may end up remaining in the tank. It is also possible to connect the discharge pipe near the water surface of the tank or at a mid-height position in the tank's water depth, but in that case, it would be difficult to send out at least the screen residue that sinks.

In view of the above circumstances, the present invention aims to provide a fluid transfer method and a fluid transfer device that can transfer sediment regardless of its specific gravity.

The transfer method of the fluid transfer device of the present invention which solves the above-mentioned object is a transfer method of a fluid transfer device provided with a receiving section which receives screen residue and a transfer space forming member which defines a transfer space into which the screen residue flows from the receiving section, comprising:
an inflow process of causing the 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 the sediment in the transfer space by discharging transfer water into the transfer space in the blocked state;
and a drainage step of draining the transfer water remaining in the transfer space after the sediment has been transferred from the transfer space,
The inflow step is a step of connecting the transfer space into which the transfer water has been drained and the receiving section, and causing the screen residue received by the receiving section to flow into the transfer space.

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

The transfer method of this fluid transfer device allows the screenage to flow into the transfer space and be transferred by the transfer water, regardless of the screenage's specific gravity.

In this method of transferring fluid using a fluid transfer device, the inflow process, the blocking process, the transfer process, and the drainage process may be repeated.

By repeating these steps, the residue received by the receiving section can be transferred sequentially. In addition, the fluid transfer device can be made smaller.

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 transfer space forming members among the multiple transfer space forming members.

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

In addition, 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 portion and the transfer space between a flow-through state in which the receiving portion and the transfer space are connected and a blocked state in which the receiving portion 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 flow 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 to which 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.

This fluid transfer device allows the screen residue to flow into the transfer space and be transferred by the transfer water, regardless of the screen residue's specific gravity.

In this fluid transfer device, the switching means may be a rotatable inner cylinder that is disposed inside an outer cylinder having an outer cylinder flow port through which the screen residue can flow, and that has 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.

According to this aspect, the connection and disconnection between the transfer space forming member and the receiving portion can be switched with a simple configuration, so the fluid transfer device can be constructed inexpensively.

The present invention provides a method for transferring fluid and a fluid transfer device that can transfer fluid regardless of the specific gravity of the residue.

FIG. 1 is a schematic plan view of a pumping station and a fluid transfer device. FIG. 2 is a cross-sectional view showing a schematic diagram of the pumping station and the fluid transfer device shown in FIG. 1 . 1A is a cross-sectional view showing the transport device main body, and FIG. 1B is a cross-sectional view taken along the line AA in FIG. 3A is a cross-sectional view showing the inner tube rotated 90 degrees counterclockwise from FIG. 3B, and FIG. 3B is a cross-sectional view showing the inner tube rotated another 90 degrees counterclockwise from FIG. 3A. 2 is a flowchart showing the operation of the fluid transfer device shown in FIG. 1 . FIG. 2 is a plan view similar to FIG. 1, showing a schematic diagram of a modified pumping station and fluid transfer device; 3A is a cross-sectional view of the fluid transfer device of the second embodiment similar to FIG. 3A, and FIG. 3B is a cross-sectional view taken along line BB of FIG. 7A is a cross-sectional view taken along the line CC in FIG. 7A showing the state when the fluid transfer device is in a flowing state, (b) is a cross-sectional view taken along the line CC showing the state when the inner cylinder has been rotated 180 degrees from (a) in FIG. 7A and the state when the fluid transfer device is in a blocked state, and (c) is a cross-sectional view taken along the line CC showing the state when the inner cylinder has been rotated 50 degrees from (a) in FIG. 3(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, FIG. 3(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 FIG. 3(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. 10 is a flowchart showing the operation of the fluid transfer device shown in FIG. 9 . A diagram showing the transfer device body of the fourth embodiment, viewed from the downstream side to the upstream side of the flow of wastewater in a settling basin. 12 is a flowchart showing the operation of the fluid transfer device shown in FIG. 11 . 12 is a view similar to FIG. 11, showing a modification of the fluid transfer device shown in FIG. 11.

Below, an embodiment of the present invention will be described with reference to the drawings. One embodiment of the present invention, a fluid transfer device, transfers sediment captured by a dust collector installed at a pumping station. A pumping station is a solid-liquid separation device installed at a wastewater treatment facility, which 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 pumps the wastewater from which the sand has been removed.

Figure 1 is a plan view that shows a schematic diagram of a pumping station and a fluid transfer device. Figure 2 is a cross-sectional view that shows a schematic diagram of the pumping station and the fluid transfer device shown in Figure 1.

The pumping station 9 shown in FIG. 1 includes an inflow channel 91, two grit basins 93, 93 in which sand settles, and a pump well 95. The pumping station 9 is rectangular in plan view. The inflow channel 91 receives wastewater such as sewage and rainwater from the left end in FIG. 1. The wastewater received by the inflow channel 91 is distributed to two grit basins 93, 93. The two grit basins 93, 93 are arranged in parallel to the flow direction of the wastewater in the midstream part of the pumping station 9. Since the two grit basins 93, 93 have the same configuration, the following description may describe the grit basins 93 without distinguishing between the two grit basins 93, 93. The wastewater slowly flows toward the pump well 95 while the sand mixed in the wastewater settles in the grit basin 93. The bottom of the grit basin 93 forms a sand pool in which sand accumulates. The two grit basins 93, 93 are connected to the same pump well 95. The wastewater that passes through the grit basin 93 flows into the pump well 95. The pump well 95 stores the wastewater from which sand has been removed in the grit basin 93. A lifting pump P2 is installed inside the pump well 95. The wastewater pumped by the lifting pump P2 is sent to a sedimentation basin (not shown) for the next stage of wastewater treatment.

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

The dust remover 935 is provided in the most upstream part of the wastewater flow in the settling basin 93. The dust remover 935 is for removing 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 blocked by the dust remover 935. When the dust remover 935 is driven, the screen residue blocked by the dust remover 935 is lifted above the settling basin 93 by a rake 9351 provided on the dust remover 935, and is thrown into the fluid transfer device 1, as shown by the downward arrow with an arc in FIG. 2.

The fluid transfer device 1 transfers the screened residue input from the dust collector 935. The screened residue is transferred to the separator 3 together with the 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 main pipe 14 that is used in common, so 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 an outlet pipe 13. The configuration of the transfer device main body 11 will be described in detail later.

The transfer water supply pipe 12 supplies the transfer water to the transfer device main body 11. The transfer water supply pipe 12 is simplified and shown 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 water treated in an aeration tank or a final sedimentation tank downstream of the pump station 9, and 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-facing arrow. Note that as the transfer water, wastewater pumped up by the lift pump P2 may be used, or purified water flowing through a water supply system may be used. In addition, the two transfer water supply pipes 12, 12 in this embodiment are supplied with transfer water pumped up by one pump, but 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. By opening this electric valve 121, the transfer water is supplied to the transfer device main body 11.

The delivery pipe 13 is a pipe that transports the screen residue sent out from the transfer device main body 11 together with the transfer water. The delivery pipe 13 provided in each fluid transfer device 1 is connected to the mother pipe 14. The delivery pipe 13 and the mother pipe 14 are transfer pipes through which the screen residue sent out from the fluid transfer device 1 is transported. As shown in FIG. 2, the mother pipe 14 has a portion that extends upward. However, the delivery pipe 13 may have a portion that extends upward and the mother pipe 14 may be arranged on the same horizontal plane, or the delivery pipe 13 and the mother pipe 14 may each have a portion that extends upward. The delivery pipe 13 and the mother pipe 14 are simplified and shown by thick solid lines in FIG. 1. In the delivery pipe 13 of this embodiment, a bent pipe or a 45-degree elbow with a gentle bend is used at the portion where the direction changes to prevent the screen residue from clogging. In FIG. 1, a 90-degree bend made 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 provided with a check valve 131 and a drain pipe 132. The check valve 131 is installed immediately before the main pipe 14 so as to prevent the backflow of the residue and the transfer water from the main pipe 14. The drain pipe 132 is disposed between the transfer device main body 11 and the check valve 131 of the delivery pipe 13. The drain pipe 132 is for draining the transfer water remaining in the transfer space V2 described later from the transfer space V2. This drain pipe 132 corresponds to an example of a draining means. The drain pipe 132 is provided 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 from the check valve 131 and the transfer water in the transfer space V2 are drained by their own weight, and the transfer space V2 becomes empty. The main pipe 14 is disposed at the top of the separator 3 at the end opposite to the end connected to the delivery pipe 13. The screened residue and the 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. When the main pipe 14 is omitted, it is preferable to also omit the check valve 1321. In the separator 3, the screened residue and the 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, the screened residue is discharged into the loading platform of the truck T. The screened residue discharged from the hopper 4 is transported by the truck T outside the sewage treatment plant and is incinerated or otherwise treated.

Figure 3(a) is a cross-sectional view showing the transfer device main body, and Figure 3(b) is a cross-sectional view taken along the line A-A in Figure 3(a). Figure 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.

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 is a section that receives the screen waste fed 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 is a square funnel shape that expands in all directions as it goes upward. A detection device 1011 that detects the amount of screen waste is disposed in the lower part of the receiving section 101. The cylindrical section 102 includes an outer cylinder 1021, an inner cylinder 1022, two packings 1023, a seal 1024, and a drive mechanism 1025. An upper opening 1021a extending in the axial direction is formed in the upper end part of the circumferential surface of the outer cylinder 1021. This upper opening 1021a is connected to the lower end of the receiving section 101. The outer cylinder 1021 and the receiving part 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 circumferential surface of the outer cylinder 1021. The lower opening 1021b has substantially the same shape as the upper opening 1021a. These lower opening 1021b and upper opening 1021a are openings through which the sediment can flow. The lower opening 1021b in this embodiment corresponds to an example of an outer cylinder flow port. The lower opening 1021b is connected to an opening formed at the upper end portion of the transfer space forming member 112 having the transfer space V2 therein. That is, in a state in which the inner cylinder 1022 is not present, the space inside the outer cylinder 1021 is continuous with the space inside the receiving part 101 through the upper opening 1021a, and is also continuous with the transfer space V2 through the lower opening 1021b. As shown in FIG. 3(a), both axial ends of the outer cylinder 1021 are closed except for the portion through which the drive shaft 1022c (described below) passes.

The inner cylinder 1022 is rotatably arranged inside the outer cylinder 1021. This inner cylinder 1022 corresponds to an example of a switching means. The inner cylinder 1022 is cylindrical with both ends closed 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 the 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 the 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 is shaped to protrude from the inner cylinder 1022 toward the outer cylinder 1021 in order to block the gap between the inner cylinder 1022 and the outer cylinder 1021. In addition, 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.

As shown in FIG. 3(a), two packings 1023, 1023 are attached to the entire outer circumferential surface of the inner cylinder 1022 at both ends of the inner cylinder 1022 in the axial direction. The packings 1023 are intended to close the gap between the outer cylinder 1021 and the inner cylinder 1022 at both ends of the inner cylinder 1022 in the axial direction, and to prevent the fluid from passing through the gap and moving in the axial direction. The seal 1024 is intended to selectively block the upper opening 1021a and the lower opening 1021b of the outer cylinder 1021. In FIG. 3(a) and FIG. 3(b), the state in which the lower opening 1021b is blocked by the seal 1024 is shown. The seal 1024 is a sheet-like member that is one size 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 to 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 driving force is transmitted to this drive mechanism 1025 from a motor (not shown). When the driving force is transmitted to this drive mechanism 1025, the inner cylinder 1022 rotates around its central axis.

The transfer space forming member 112 is a cylindrical member with a bottom and 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 to 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 is a space having a volume equal to or larger 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, this outlet 12a is arranged in the transfer space V2. In FIG. 3(a), the discharge direction of the transfer water is indicated by an arrow pointing to the left. 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 blocked 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, and the flow of the transfer water further transports the screened residue through the delivery pipe 13 and the parent pipe 14 to the separator 3. By making the discharge port 12a flat, the flow rate and discharge pressure of the transfer water are increased, improving the ability to transport the screened residue in the transfer space V2.

The outer cylinder 1021 is fixed to the transfer space forming member 112 at a position where the lower end portion is inserted into the 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 welding, for example. 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 a blocked state. In this blocked state, the residue in the transfer space V2 and the transfer water discharged into the transfer space V2 are prevented from moving to the receiving section 111 side.

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).

As described above, the inner cylinder 1022 rotates around the axial direction 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 put into the receiving section 101 is stored in the storage space V1. As shown in FIG. 4(a), when the inner cylinder 1022 rotates to a certain extent from the blocked state shown in FIG. 3(b), the storage space V1 and the receiving section 101 are blocked, and the residue put into the receiving section 101 cannot fall from the receiving section 101 into the storage space V1. Also, as shown in FIG. 4(b), when the inner cylinder 1022 rotates 180 degrees from the blocked state shown in FIG. 3(b) and the inner cylinder flow port 1022a reaches the lower end, and the position of the inner cylinder flow port 1022a coincides with the position of the lower opening 1021b of the outer cylinder 1021, the storage space V1 and the transfer space V2 are connected to each other in a flow state. When a portion of the inner cylinder flow port 1022a and a portion of the lower opening 1021b overlap, the storage space V1 and the transfer space V2 are connected in a flow 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 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.

Next, the transfer operation of the fluid transfer device 1 will be described. Figure 5 is a flow chart 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.

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 by commands from the control device. In this embodiment, the control device controls the dust collector 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 collector 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 the screen residue has been input from the dust collector 935.

5, in the transfer operation of the fluid transfer device 1, an initial operation is first performed (step S1). In the initial operation, the inner cylinder 1022 is rotated so as to be in the shutoff state shown in FIG. 3(a) and FIG. 3(b). In addition, in the initial operation, if the motorized valve 121 is open, the motorized valve 121 is closed. Furthermore, the drain valve 1321 is once opened, and 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 are drained from the drain pipe 132, and then the drain valve 1321 is closed. This drain operation in the initial operation corresponds to an example of a drainage process. Note that, if there is no transfer water in the transfer space V2, the drain valve 1321 may be simply closed without opening it. In other words, if the drainage of the transfer space V2 was performed at the end of the previous transfer operation, the drainage process has already been performed, so the drainage operation in the initial operation may be omitted. In the blocked state, the residue received by the receiving unit 111 from the dust collector 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 end, and the storage space V1 and the transfer space V2 are connected to each other in a flow state, causing 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 elapse of a certain period of time may be detected and step S3 may be executed every time the certain period of time has elapsed. This step S3 corresponds to an example of an inflow process.

When the screen residue flows into the transfer space V2, the inner cylinder 1022 is rotated until the inner cylinder flow port 1022a reaches the top end, and the receiving section 111 and the transfer space V2 are blocked off (step S4). This step S4 corresponds to an example of a blocking process. Next, the motor valve 121 is opened to discharge the transfer water from the discharge port 12a, and the screen residue in the transfer space V2 is transferred to the separator 3 through the delivery pipe 13 and the main pipe 14. When the transfer of the screen residue in the transfer space V2 is completed, the motor valve 121 is closed to stop the discharge of the transfer water (step S5). This step S5 corresponds to an example of a transfer process. When the transfer in step S5 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 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 from the drain pipe 132, and when the drainage is completed, the drain valve 1321 is closed (step S6). This step S6 corresponds to an example of a drainage process. If the dust collector 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 collector 935 has stopped (YES in step S7), the transfer operation is terminated. Note that while the operating time of the dust collector 935 is generally several hours, the operating time per cycle of steps S2 to S7 is about several minutes, so that after the transfer operation is started, the operations of steps S2 to S7 are repeated multiple times.

According to this embodiment, since the screens are flowed into the drained transfer space V2, the screens can be transferred by the transfer water regardless of the specific gravity of the screens. In addition, since the operations of steps S2 to S6 are repeatedly performed while the dust collector 935 is operating, the screens received by the receiving unit 111 can be transferred sequentially by the volume of the storage space V1. This allows the receiving unit 111 to be made smaller. Furthermore, since the cylindrical portion 102 of the receiving unit 111 is provided with an outer cylinder 1021 and an inner cylinder 1022, and the connection state and the disconnection state are switched by rotating the inner cylinder 1022, the fluid transfer device 1 can be made inexpensive. Furthermore, since the screens are transferred within the delivery pipe 13 and the mother pipe 14, there is no risk of odor leakage during transfer. In addition, since the screens can be transferred upward, the height of the dust collector 935 can be lowered. As a result, the cost of the dust collector 935 is reduced, and the entire pump station 9 in which the fluid transfer device 1 is installed can be constructed inexpensively. Furthermore, the driving force of the dust collector 935, which lifts the sediment to a high position, is reduced, so power consumption at the pump station 9 can also be reduced.

Next, modified examples of the fluid transfer device 1 will be described. In the following description, components with the same names as those previously described will be assigned the same reference numerals, and duplicate descriptions may be omitted.

Figure 6 is a plan view similar to Figure 1, but showing a schematic diagram of a modified pump station and fluid transfer device.

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

The fluid transfer device 1 and pump station 9 of this modified example have the same effects as the previous embodiment, and 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 in front of 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.

Next, the fluid transfer device 1 of the second embodiment will be described. 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 B-B of Figure 3(a).

The transfer device body 11 shown in FIG. 7 differs from the transfer device body 11 shown in FIG. 3 in that the outer tube 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 the inner tube 1022 forms the transfer space V2. In addition, in this second embodiment, the receiving portion 111 is only the receiving portion 101, and the cylindrical portion 102 is not a component of the receiving portion 111. In FIG. 7 and FIG. 8 described later, the gap between the outer tube 1021 and the inner tube 1022 is shown widely in order to make the outer tube 1021 and the inner tube 1022 easier to see, but in reality, there is only a very small gap between the outer tube 1021 and the inner tube 1022. As shown in FIG. 7(a) and FIG. 7(b), the downstream end of the outer tube 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 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 arranged in the outer cylinder 1021. The inner cylinder 1022 is a bottomed cylindrical shape with 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 the upstream end in the discharge direction of the transfer water. The space inside the inner cylinder 1022 is a space that serves as both the storage space V1 and the transfer space V2. In the following description of the second embodiment, the space that serves as both the storage space V1 and the transfer space V2 is 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 on the circumferential surface of the inner cylinder 1022. The 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.

Figure 8 (a) is a cross-sectional view taken along the line C-C in Figure 7, showing the state when the fluid transfer device is in a flowing state, and (b) is a cross-sectional view taken along the line C-C showing the state when the inner cylinder has been rotated 180 degrees from (a) in Figure 8 and the fluid transfer device has entered a blocked state. Also, (c) is a cross-sectional view taken along the line C-C showing the state when the inner cylinder has been rotated 50 degrees from (a) in Figure 8 and the fluid transfer device has entered a blocked state. Note that the background has been omitted from Figure 8.

As shown in FIG. 8(a), in the flow state, the inner cylinder flow port 1022a of the inner cylinder 1022 is located at the upper end of the inner cylinder 1022, and the inner cylinder flow port 1022a and the upper opening 1021a of the outer cylinder 1021 are connected. In this flow state, the screen residue received by the receiving section 111 (receiving section 101) falls into the inner cylinder 1022 and is stored in the transfer space V2. As shown in FIG. 8(b), in the blocked state in which the inner cylinder 1022 is rotated 180 degrees from the flow state, the receiving section 111 and the transfer space V2 are blocked. In this blocked state, the transfer water is discharged from the discharge port 12a, and the screen residue in the transfer space V2 is sent into the delivery pipe 13, and the flow of the transfer water further transports the screen residue through the delivery pipe 13 and the mother pipe 14 shown in FIG. 1 to the separator 3. 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 state to the blocked state, but the inner tube 1022 may be rotated to the blocked state so 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 state to the blocked state. In this way, by reducing the rotation angle, the time required to switch between the flow state and the blocked state can be shortened, and the amount of power consumed in switching between the flow state and the blocked state can also be reduced.

In addition to the same effects as the previous embodiment, the second embodiment of the fluid transfer device 1 has the advantage that the transfer device main body 11 can be constructed inexpensively because the structure of the transfer device main body 11 is simplified.

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 blocked state of the transfer device main body of the third embodiment, Fig. 9(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 Fig. 9(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.

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 approximately the entire circumference of the outer circumferential surface of the inner tube 1022 except for the portion where the inner tube 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 tube 1021. The first lower opening 1021bA and the second lower opening 1021bB of this embodiment correspond to an example of an outer tube flow port. The first lower opening 1021bA and the second lower opening 1021bB have approximately 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 part of the second transfer space forming member 112B. That is, 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, without the inner cylinder 1022. In this third embodiment, the tip end portion of the transfer water supply pipe 12 is branched into two, forming a first branch supply pipe 12A and a second branch supply pipe 12B. A first motor valve (not shown) is disposed in the first branch supply pipe 12A, and a second motor 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 from the upstream side of 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 from the upstream side of the flow of the transfer water. Note that although the gap between the outer tube 1021 and the inner tube 1022 is drawn wide in FIG. 9, in reality, there is only a small gap between the outer tube 1021 and the inner tube 1022.

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. In this blocked state, the 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 coincide with each other, and the storage space V1 and the first transfer space V2A are connected. In this first flow state, the residue stored in the storage space V1 flows into the first transfer space V2A by its own weight. In the second flow state shown in FIG. 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.

Figure 10 is a flowchart showing the operation of the fluid transfer device shown in Figure 9.

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 so as to be in the shutoff state shown in FIG. 9(a). In the initial operation, the first electric valve provided in the first branch supply pipe 12A and the second electric valve provided in the second branch supply pipe 12B are closed. In addition, the first drain valve and the second drain valve are once 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 drain 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 drain operation in the initial operation may be omitted. In the shutoff state, the sediment input 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 or not the first transfer process described below is being performed (step S13). If the first transfer process is not being performed (NO in step S13), the first transfer process is started (step S17). If the first transfer process is being performed (YES in step S13), it is determined whether or not the second transfer process described below is being performed (step S14). If the second transfer process is being performed (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 performed (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 or not the dust collector 935 is stopped (step S16). If the dust remover 935 is not stopped (NO in step S16), return to step S12. If the dust remover 935 is stopped (YES in step S16), the transfer operation ends after the first or second transfer process being executed is completed.

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 coincide, and the first flow state is established in which the storage space V1 and the first transfer space V2A are connected, so that the residue received by the receiving unit 111 flows into the first transfer space V2A (step S171). This step S171 corresponds to an example of an inflow process. Note that 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 second lower opening 1021bB do not coincide during rotation. When the residue flows into the first transfer space V2A, the inner cylinder 1022 is rotated until the inner cylinder flow port 1022a reaches the upper end, and 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 does not coincide with the position of the second lower opening 1021bB during the rotation. Next, the first motor valve provided in the first branch supply pipe 12A is opened to discharge the transfer water from the first discharge port 12Aa, and the screen 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 screen residue in the first transfer space V2A is completed, the first motor 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 to drain the transfer water in the first delivery pipe on the transfer device main body 11 side of the first check valve and the transfer water in the first transfer space V2A, and when the drainage is complete, the first drain valve is closed (step S174). This step S174 corresponds to an example of a drainage process. This completes the first transfer process.

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 coincide, and the second flow state is established in which the storage space V1 and the second transfer space V2B are continuous, so that the residue received by the receiving unit 111 flows into the second transfer space V2B (step S151). This step S151 corresponds to an example of an inflow process. Note that 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 first lower opening 1021bA do not coincide during rotation. When the residue flows into the second transfer space V2B, the inner cylinder 1022 is rotated until the inner cylinder flow port 1022a reaches the upper end, and 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 does not coincide with the position of the first lower opening 1021bA during the rotation. Next, the second motor valve provided in the second branch supply pipe 12B is opened to discharge the transfer water from the second discharge port 12Ba, and the screen 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 screen residue in the second transfer space V2B is completed, the second motor 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 drainage is complete, the second drain valve is closed (step S154). This step S154 corresponds to an example of a drainage process. This completes the second transfer process.

In addition to the same effects as the previous embodiment, the third embodiment of the fluid transfer device 1 has the advantage that the transfer process is performed at different times in the first transfer space forming member 112A and the second transfer space forming member 112B, which increases the amount of screen residue transferred. This also has the effect of allowing the transfer device main body 11 to receive more screen residue.

Next, we will explain the fourth embodiment of the fluid transfer device 1. Figure 11 is a view of the transfer device body of the fourth embodiment, viewed from the downstream side to the upstream side of the flow of wastewater in the grit basin.

The fluid transfer device 1 shown in FIG. 11 receives the screen residue from the dust collector 935 installed in the two settling basins 93, 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 has two receiving sections 111, 111, a transfer space forming member 112, a transfer water supply pipe 12, a delivery pipe 13, and a drain pipe 132. The receiving section 111 is a section that receives the screen residue input from the dust collector 935. Since the two receiving sections 111, 111 have the same configuration, the following description may be given without distinguishing between the two receiving sections 111, 111. The receiving section 111 of this embodiment has a receiving section 101, a storage pipe 103, a switching motor valve 104, and a cleaning pipe 105. The receiving section 111 is a section that receives the screen residue input from the dust collector 935 (see FIG. 1). The receiving part 101 has a square funnel shape that expands in a direction perpendicular to the paper surface in FIG. 11 as it goes upward. The storage tube 103 has a bottomed cylindrical shape with a storage side plate 1031 to which the tip of the cleaning tube 105 is fixed. The inside of this storage tube 103 becomes the storage space V1. The sediment discharged from the dust collector 935 passes through the receiving part 101 and is temporarily stored in the storage space V1. A switching motorized valve 104 is disposed at the end of the storage tube 103 opposite to the storage side plate 1031. The switching motorized 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 part 111 and a blocked state in which the receiving part 111 is blocked from the transfer space V2. The switching motorized valve 104 is opened to enter a connected state, and closed to enter a blocked state. This switching motorized 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 on 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 is stopped.

The transfer space forming member 112 is a cylindrical member 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. The transfer space forming member 112 defines a transfer space V2. The sediment stored in the storage space V1 flows into this transfer space V2 together with the cleaning water. The transfer space V2 is a space having a volume equal to or larger 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 branch of the first branch pipe 1123 to the switching motor valve 104 of the receiving part 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 switching motor 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 branch of the second branch pipe 1125 to the switching motor valve 104 of the receiving part 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 switching motor 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.

The transfer water supply pipe 12 supplies transfer water to the transfer space forming member 112. An electric valve 121 is provided on the transfer water supply pipe 12. By opening this electric valve 121, transfer water is supplied to the transfer space forming member 112. In FIG. 11, the flow direction of the transfer water is indicated by a right-facing arrow. In the blocked state, the 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.

The delivery pipe 13 is a pipe that transports the screen residue that is sent out from the transfer space forming member 112 together with the transfer water and cleaning water. 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 transported to the separator 3. In order to prevent the screen residue from clogging the delivery pipe 13, a 45-degree elbow or a bent pipe is used at the point where the direction changes.

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.

Next, the transfer operation of the fluid transfer device 1 of this fourth embodiment will be described. Figure 12 is a flowchart showing the operation of the fluid transfer device shown in Figure 11.

As shown in FIG. 12, when the transfer operation is started, an initial operation is first performed (step S21). In the initial operation, the switching motor valve 104, the cleaning water supply valve 1051, and the motor valve 121 are closed. Furthermore, the drain valve 1321 is opened once 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 drainage process. 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. By closing the switching motor valve 104, the fluid transfer device 1 is in a shutoff state. In the shutoff state, the sediment received by the receiving section 111 is stored in the storage space V1. When the detector 1011 of one 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 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 switching motor 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 residue stored in the storage space V1 is flushed with the cleaning water and allowed to flow into the transfer space V2 (step S25). These steps S24 and S25 correspond to an example of the flow-in process.

When the screened residue flows into the transfer space V2, the switching motor valve 104 is closed to shut off the transfer space V2 from the receiving section 111 (step S26). This step S26 corresponds to an example of a shutoff process. Next, it is confirmed that both switching motor valves 104 provided in the two receiving sections 111, 111 are closed, and 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 process. 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 process. After that, 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 ends.

The fluid transfer device 1 and pump station 9 of this fourth embodiment have the same effects as the previous embodiment, and also have the effect of only requiring one fluid transfer device 1 for two dust collectors 935.

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, the 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 given the same reference numerals as used so far, and duplicate descriptions will be omitted.

Figure 13 is a diagram similar to Figure 11, showing a modified example of the fluid transfer device shown in Figure 11.

The fluid transfer device 1 shown in FIG. 13 is different from the fluid transfer device 1 shown in FIG. 11 in that the second branch pipe 1125 and the second connection pipe 1126 are not provided, and both of the two receiving parts 111, 111 are connected to the first connection pipe 1124. As shown in FIG. 13, the transfer space forming member 112 includes the space forming member main pipe 1120, the first branch pipe 1123, the first connection pipe 1124, and the third branch pipe 1127. The first connection pipe 1124 is provided with a Y-shaped fourth branch pipe 1128. Each of the three ends of the fourth branch pipe 1128 is attached with a 45-degree elbow. The first connection pipe 1124 is connected to the first branch pipe 1123 and the switching motor valves 104 of the two receiving parts 111, 111, with the fourth branch pipe 1128 at the center.

In addition to the same effects as the fourth embodiment, this modified fluid transfer device 1 also has the effect of making the fluid transfer device less expensive by omitting the second branch pipe 1125 and the second connecting pipe 1126.

The present invention is not limited to the above-mentioned 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 grit basins 93, 93, but the fluid transfer device 1 may be used in a pumping station 9 having only one grit basin 93, or in a pumping station 9 having three or more grit basins 93. When the fluid transfer device 1 is used in a pumping station 9 having only one grit basin 93, it is preferable to omit the main pipe 14 and extend the delivery pipe 13 to the separator 3, and omit the check valve 1321. In the present embodiment, the receiving section 111 directly receives the screened residue input from the dust remover 935, but a crusher may be provided between the dust remover 935 and the receiving section 111, and the crushed screened residue may be input to the receiving section 111. Furthermore, the drain pipe 132 may be arranged upstream in the transfer direction from the position where the screened residue flows in. This has the effect of preventing the transfer of sediment 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 outlets 12a provided in each fluid transfer device 1 is discharging the transfer water, the drain valves 1321 provided in the other fluid transfer devices 1 may be controlled to close.

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

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

1 Fluid transfer device 12 Transfer water supply pipe (transfer means)
104 Switching motor valve (switching means)
111 Receiving portion 112 Transfer space forming member 132 Drain pipe (drainage means)
1022 Inner cylinder (switching means)
V2 Transfer space

Claims (5)

A method for transferring a fluid using a fluid transfer device having a receiving section for receiving screen residue and a transfer space forming member for defining a transfer space into which the screen residue flows from the receiving section, comprising:
an inflow process of causing the 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 the sediment in the transfer space by discharging transfer water into the transfer space in the blocked state;
and a drainage step of draining the transfer water remaining in the transfer space after the sediment has been transferred from the transfer space,
A transfer method for a fluid transfer device, characterized in that the inflow process is a process 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. The method for transferring fluid from a fluid transfer device according to claim 1, characterized in that the inflow process, the blocking process, the transfer process, and the drainage process are repeated processes. The method for transferring fluid from a fluid transfer device according to claim 1 or 2, characterized in that the inflow process, the blocking process, the transfer process, and the drainage process are performed at different times for each of the transfer space forming members among the plurality of transfer space forming members. A receiving section for receiving sediment;
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 portion and the transfer space between a flow-through state in which the receiving portion and the transfer space are connected and a blocked state in which the receiving portion 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 flow 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 to which the sediment has been transferred from the transfer space,
The fluid transfer device according to claim 1, wherein the switching means connects the transfer space from which the transfer water has been drained by the drainage means to the receiving portion, thereby switching the state to the circulating state. The fluid transfer device according to claim 4, characterized in that the switching means is a rotatable inner cylinder that is arranged inside an outer cylinder having an outer cylinder flow port through which the screen residue can flow, and has an inner cylinder flow port through which the screen residue can flow, and the flow state and the blocking state are switched by changing the relative positions of the outer cylinder flow port and the inner cylinder flow port by rotation.

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