Cleaning device and cleaning method

Abstract

To provide a technique for peeling sediment deposited on a water bottom from the water bottom while stirring an area upper than an area close to the water bottom with strong force.SOLUTION: A cleaning device 100 includes: a pipe 110 arranged along a water bottom 190 of a storage part 180 for storing water; and a supply part communicating with the pipe 110 and capable of performing a supply operation to supply water to the pipe 110. A plurality of holes 116 functioning as a nozzle to emit water inside the pipe 110 to the water bottom 190 are arranged in the pipe 110.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present disclosure relates to a cleaning device and a cleaning method.

Background Art

[0002] As a technology related to cleaning in water, there is an underwater cleaner such as that disclosed in Patent Document 1. When the underwater cleaner of Patent Document 1 cleans the garbage in water such as an aquarium for raising fish or the garbage deposited on the bottom, the water inlet of the underwater pump is held in the water, and a garbage collection chamber that can be attached or detached is provided at this water inlet. Further, a water suction pipe is connected to the inlet of this underwater cleaner, and a check valve that allows water to pass through but blocks garbage is provided at the connection part between the garbage collection chamber and the water suction pipe, and a water discharge pipe that circulates to the discharge port of the underwater pump is connected. And this underwater cleaner floats the garbage in the water by washing the inside of the aquarium with the outlet water flow of the water discharge pipe, and sucks it into the garbage collection chamber with the suction water.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] The underwater cleaner disclosed in Patent Document 1 is configured to forcibly float the garbage deposited on the bottom in the water by discharging water intensively from a single water discharge pipe from above far away from the bottom. In a configuration like this, due to the movement of the water discharge pipe or the flow of the water discharged from the water discharge pipe, the intermediate region above the vicinity of the bottom and the upper region near the water surface are easily stirred with a strong force, and it is difficult to apply to an environment where such strong stirring of these regions is not desired.

[0005] One of the objects of the present disclosure is to provide a technique capable of peeling sediment deposited on the bottom of a body of water from the bottom while suppressing strong agitation of the region above the vicinity of the bottom of the body of water.

Means for Solving the Problem

[0006] One of the cleaning devices of the present disclosure is a pipe installed along the bottom of a housing part that houses water, a supply part that communicates with the pipe and is capable of performing a supply operation of supplying water to the pipe, a shaft part that is connected to the pipe and extends upward from the pipe, and has a plurality of hole parts are provided in the pipe, which function as nozzles for discharging the water in the pipe toward the bottom of the body of water, the shaft part and the pipe are rotatable about a rotation axis along the shaft part, when the shaft part and the pipe rotate about the rotation axis, the plurality of hole parts move along the bottom of the body of water.

[0007] One of the cleaning devices of the present disclosure is a pipe installed along the bottom of a housing part that houses water, a supply part that communicates with the pipe and is capable of performing a supply operation of supplying water to the pipe, a suction part that communicates with the pipe and is capable of performing a suction operation of sucking water from the pipe, a switching part that switches between a first state in which the suction operation by the suction part is stopped while allowing the supply operation by the supply part, and a second state in which the supply operation by the supply part is stopped while allowing the suction operation by the suction part, and has a plurality of hole parts are provided in the pipe, which function as nozzles for discharging the water in the pipe toward the bottom of the body of water, when the switching part is in the first state, the water supplied to the pipe by the supply part is discharged from the plurality of hole parts toward the bottom of the body of water, when the switching part is in the second state, the water in the housing part is sucked into the pipe from the plurality of hole parts.

[0008] One of the cleaning devices of the present disclosure is a pipe installed along the bottom of a storage part for storing water, a supply part that communicates with the pipe and is capable of performing a supply operation for supplying water to the pipe, a water intake part that takes in water in the storage part and is arranged above the pipe in the storage part, a water intake flow path that guides the water that has entered the water intake, a guiding part that can guide the water guided by the water intake flow path to a different flow path from the water intake flow path, and has a plurality of hole parts are provided in the pipe, which function as nozzles for discharging the water in the pipe toward the bottom of the water, the plurality of hole parts move along the bottom of the water.

[0009] One of the cleaning methods of the present disclosure is a pipe provided with a plurality of hole parts, a supply part capable of performing a supply operation for supplying water, a shaft part, and uses the supply part is provided so as to communicate with the pipe, the pipe is arranged along the bottom of a storage part for storing water and the plurality of hole parts face the bottom side of the water, the shaft part is connected to the pipe so as to extend upward from the pipe, by supplying water to the pipe by the supply part, the water in the pipe is discharged from the plurality of hole parts toward the bottom of the water, the shaft part and the pipe are rotated around a rotation axis along the shaft part, so that the plurality of hole parts are displaced along the bottom of the water.

[0010] One of the cleaning methods of the present disclosure is a pipe provided with a plurality of hole parts, a supply part capable of performing a supply operation for supplying water, a suction part capable of performing a suction operation for sucking water, A switching unit that switches between a first state in which the suction operation by the suction unit is stopped while allowing the supply operation by the supply unit, and a second state in which the supply operation by the supply unit is stopped while allowing the suction operation by the suction unit; is used, The supply unit and the suction unit are provided so as to communicate with the pipe, The pipe is arranged along the bottom of the storage unit that stores water, and the plurality of hole portions face the bottom side, By switching the switching unit to the first state, the water supplied to the pipe by the supply unit is discharged from the plurality of hole portions toward the bottom of the water, By switching the switching unit to the second state, the water in the storage unit is sucked into the pipe from the plurality of hole portions.

[0011] One cleaning method of the present disclosure is A pipe provided with a plurality of hole portions, A supply unit capable of performing a supply operation for supplying water, A water intake that is a part for taking in water in the storage unit, A water intake passage that guides the water that has entered the water intake, A guiding unit that guides the water guided by the water intake passage, is used, The pipe is arranged along the bottom of the storage unit that stores water, and the plurality of hole portions face the bottom side. The supply unit is provided so as to communicate with the pipe. The water intake is arranged above the pipe in the storage unit. The guiding unit is arranged so as to guide the water guided by the water intake passage to a different flow path from the water intake passage. The operation of displacing the plurality of hole portions along the bottom of the water and the operation of guiding the water guided by the water intake passage to the different flow path are performed simultaneously or at different times.

Advantages of the Invention

[0012] The technology according to the present disclosure can peel off the sediment deposited on the bottom of the water while suppressing the strong stirring of the region above the vicinity of the bottom of the water.

Brief Description of the Drawings

[0013]

Figure 1

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Figure 18

DETAILED DESCRIPTION OF THE INVENTION

[0014] Each of the following [1] to

[36] is an example of characteristic technologies included in the present disclosure.

[0015] 〔1〕 A tube installed along the bottom of a housing portion that stores water, A supply unit that communicates with the tube and is capable of performing a supply operation for supplying water to the tube, A shaft portion that is connected to the tube and extends upward from the tube, having, The tube is provided with a plurality of hole portions that function as nozzles for discharging the water in the tube toward the bottom of the water, The shaft portion and the tube are rotatable about a rotation axis along the shaft portion, When the shaft portion and the tube rotate about the rotation axis, the plurality of hole portions move along the bottom of the water Cleaning device.

[0016] The cleaning device described above in [1] can remove deposits near the bottom by discharging water from a plurality of holes provided in a pipe near the bottom towards the bottom. And since this cleaning device can move a pipe having such a function along the bottom, it is possible to remove deposits deposited on the bottom from the bottom over a wider range. Moreover, since the cleaning device is configured to move the pipe along the bottom by rotating a shaft extending upward from the pipe about a rotation axis along the shaft, it is possible to suppress stirring a region above the vicinity of the bottom in the housing when the pipe moves. Therefore, the cleaning device can effectively and widely remove deposits deposited on the bottom while suppressing stirring a region above the vicinity of the bottom with a strong force.

[0017] 〔2〕 A pipe installed along the bottom of a housing that stores water, a supply unit that communicates with the pipe and is capable of performing a supply operation of supplying water to the pipe, a suction unit that communicates with the pipe and is capable of performing a suction operation of sucking water from the pipe, a switching unit that switches between a first state in which the suction operation by the suction unit is stopped while allowing the supply operation by the supply unit, and a second state in which the supply operation by the supply unit is stopped while allowing the suction operation by the suction unit; and has a plurality of holes are provided in the pipe that function as nozzles for discharging water in the pipe towards the bottom, when the switching unit is in the first state, the water supplied to the pipe by the supply unit is discharged from the plurality of holes towards the bottom, when the switching unit is in the second state, the water in the housing is sucked into the pipe from the plurality of holes Cleaning device.

[0018] When the switching unit is in the first state, the cleaning device described above can discharge water from a plurality of holes provided in the pipe near the water bottom toward the water bottom by the operation of the supply unit, and can peel off the sediment near the water bottom. Since the above-described pipe is installed along the water bottom, this cleaning device can peel off the sediment deposited on the water bottom from the water bottom while suppressing strong agitation of the area above the vicinity of the water bottom. On the other hand, when the switching unit is switched to the second state, this cleaning device can suck the water in the storage unit through the plurality of holes by the operation of the suction unit, so that the peeled sediment can be recovered and processed together with the water. Thus, the above-described cleaning device can realize, while simplifying the device configuration in water by using the common pipe and the switching unit together, the cleaning for peeling off the sediment on the water bottom from the water bottom while suppressing strong agitation of the area above the vicinity of the water bottom, and the cleaning for recovering and processing the peeled sediment together with the water.

[0019] 〔3〕 A suction unit that communicates with the pipe and is capable of a suction operation of sucking water from the pipe, A switching unit that switches between a first state in which the suction operation by the suction unit is stopped while allowing the supply operation by the supply unit, and a second state in which the suction operation by the suction unit is allowed while stopping the supply operation by the supply unit; and has When the switching unit is in the first state, the water supplied to the pipe by the supply unit is discharged from the plurality of holes toward the water bottom, When the switching unit is in the second state, the water in the storage unit is sucked into the pipe through the plurality of holes The cleaning device according to 〔1〕.

[0020] When the switching unit is in the first state, the cleaning device described above can perform cleaning to peel off bottom sediments from the bottom by discharging water from the hole portion toward the bottom. Moreover, this cleaning device can perform cleaning to peel off bottom sediments from the bottom over a wide range while suppressing strong agitation of the area above the vicinity of the bottom by combining the operation of discharging water toward the bottom and the operation of rotating the shaft portion and the pipe around the rotation axis. On the other hand, when the switching unit is in the second state, this cleaning device can suck the water in the accommodating portion through the plurality of hole portions by the operation of the suction portion, so that the peeled sediments can be collected and processed together with the water. Furthermore, this cleaning device can perform cleaning to collect and process the peeled sediments together with the water over a wide range while suppressing strong agitation of the area above the vicinity of the bottom by combining the operation of sucking water through the plurality of hole portions and the operation of rotating the shaft portion and the pipe around the rotation axis. Moreover, the above-described cleaning device can realize such characteristic cleaning while simplifying the device configuration in water by using the common pipe and the switching unit in combination.

[0021] 〔4〕 The accommodating portion has a peripheral wall disposed around the area for accommodating water and constituting the inner wall portion of the area, and a bottom wall provided on the lower end side of the peripheral wall. It has a holding portion that rotatably holds the shaft portion at a position near the peripheral wall. The cleaning device according to any one of 〔1〕 or 〔3〕.

[0022] In the cleaning device described above in 〔4〕, since the shaft portion is rotatably held at a position near the peripheral wall, it is possible to effectively suppress strong agitation of the area on the central side of the accommodating portion when moving the plurality of hole portions along the bottom.

[0023] 〔5〕 The pipe has a plurality of first pipes arranged to form a part of the pipe, and one or more second pipes arranged at one or more boundaries of the plurality of first pipes. The second pipe has flexibility and is connected so as to connect the ends of two adjacent first pipes, and communicates with the two first pipes to be connected respectively. The hole is provided at least in the first pipe. The second pipe is deformable such that the orientation of the first pipe connected to the other side of the second pipe changes with respect to the orientation of the first pipe connected to one side of the second pipe. The cleaning device according to any one of [1], [3], and [4].

[0024] In the cleaning device of [5] above, due to the presence of the second pipe, the orientation of the first pipe on the other side can change with respect to the orientation of the first pipe on one side, so the whole pipe is more likely to bend, and it is easy to deform the overall shape of the pipe according to the shape of the bottom of the water.

[0025] [6] The hole is also provided in the second pipe. The cleaning device according to [5].

[0026] In the cleaning device of [6] above, by providing a hole in the flexible second pipe as well, the function can be enhanced.

[0027] [7] The accommodating portion has a peripheral wall disposed around the region for accommodating water and constituting the inner wall portion of the region, and a bottom wall provided on the lower end side of the peripheral wall. The shaft portion is movable along the peripheral wall. The cleaning device according to any one of [1], [3], [4], [5], and [6].

[0028] In the cleaning device of [7] above, since the shaft portion is movable along the peripheral wall, it is possible to change the starting point of the rotation of the pipe at the bottom of the water, and effects such as a wider range that the pipe can reach and the ability to change the moving direction when moving the hole can be expected.

[0029] [8] It has a holding portion that holds the shaft portion movably along the peripheral wall at a position close to the peripheral wall. The cleaning device according to [7].

[0030] Since the cleaning device of the above [8] can be moved along the peripheral wall while maintaining the shaft portion at a position near the peripheral wall, a configuration that can expand the range covered by the pipe while suppressing the agitation on the center side can be realized with a highly convenient configuration.

[0031] 〔9〕 A discharge path for discharging water into the storage portion, which is configured as a path different from the pipe, and a filter portion that removes foreign matters from the water sucked from the pipe in the water passage on the downstream side of the discharge path, and are provided, The suction portion has a pump, and while sucking the water in the storage portion through the plurality of hole portions and the pipe by driving the pump, it sends it out toward the discharge path The cleaning device according to any one of [2] and [3], or the cleaning device according to any one of [4] to [8] that directly or indirectly quotes [2], or the cleaning device according to any one of [4] to [8] that directly or indirectly quotes [3]. The cleaning device described.

[0032] When the cleaning device of the above [9] sucks the water after the sediment near the bottom is peeled off by the discharge toward the bottom by the suction portion, it can remove foreign matters from the sucked water and then return the water to the storage portion.

[0033] 〔10〕 It is provided with a water intake path for introducing the water in the storage portion, The supply portion has a pump, and while sucking the water in the storage portion through the water intake path by driving the pump, it sends it out to the pipe The cleaning device according to any one of [2], [3], and [9], or the cleaning device according to any one of [4] to [8] that directly or indirectly quotes [2], or the cleaning device according to any one of [4] to [8] that directly or indirectly quotes [3].

[0034] The cleaning device of

[10] above has a circulation structure that takes water from inside the storage part and sends the water to the pipe near the bottom of the water, and can perform cleaning that discharges water from a plurality of holes toward the bottom of the water.

[0035] 〔11〕 A part for taking in water inside the storage part, a water intake port disposed above the pipe inside the storage part, a water intake passage for guiding the water that has entered the water intake port, and a guiding part that can guide the water guided by the water intake passage to a different flow path from the water intake passage. It is provided with The cleaning device according to any one of [1] to

[10] .

[0036] The cleaning device of

[11] above can peel off the sediment deposited on the bottom of the water while suppressing the strong stirring of the area above the vicinity of the bottom of the water, and further, in addition to this function, it also has the function of taking in the water inside the storage part from the water intake port disposed above the pipe and removing foreign matters, so it can correspond to both the area near the bottom of the water and the area above the pipe.

[0037] 〔12〕 A pipe installed along the bottom of a storage part for storing water, a supply part that communicates with the pipe and can perform a supply operation of supplying water to the pipe, a part for taking in water inside the storage part, a water intake port disposed above the pipe inside the storage part, a water intake passage for guiding the water that has entered the water intake port, a guiding part that can guide the water guided by the water intake passage to a different flow path from the water intake passage, has The pipe is provided with a plurality of holes that function as nozzles for discharging the water inside the pipe toward the bottom of the water, A cleaning device in which a plurality of the holes move along the bottom of the water. Cleaning device.

[0038] The cleaning device of

[12] above can peel off the sediment deposited on the water bottom while suppressing the strong agitation of the area above the vicinity of the water bottom, and further, in addition to this function, it also has the function of taking in the water in the housing part from the water intake arranged above the pipe and removing foreign matters, so it can correspond to both the area near the water bottom and the area above the pipe.

[0039] 〔13〕 The water intake is arranged at a predetermined height in the housing part, and takes in the overflow water exceeding the predetermined height in the housing part. The cleaning device according to

[11] or

[12] .

[0040] The cleaning device of

[13] above can take in the overflow water exceeding the predetermined height in the housing part, so it can effectively remove the foreign matters floating near the surface of the water stored in the housing part and the foreign matters gathered near the surface.

[0041] 〔14〕 A flow part is provided which at least generates a first flow state of flowing the water that has entered the water intake and returning it to the housing part from a path different from the water intake, and a second flow state of sucking the water in the housing part into the pipe from a plurality of the hole parts and returning it to the housing part from a path different from the plurality of the hole parts. The cleaning device according to any one of

[11] to

[13] .

[0042] The cleaning device of

[14] above can, in addition to the function of peeling off the sediment deposited on the water bottom from the water bottom, also realize the function of switching between a characteristic circulation of allowing the water in the housing part to enter and flow through the water intake located relatively on the upper side, and a characteristic circulation of sucking and flowing the water from a plurality of the hole parts located relatively on the lower side into the pipe.

[0043] 〔15〕 The first flow state includes a circulation state of flowing the water that has entered the water intake and returning it to the housing part from a plurality of the hole parts. The cleaning device according to

[14] .

[0044] When the cleaning device of the above

[15] performs a characteristic circulation in which water in the accommodation part is allowed to flow into the water intake located relatively above, it can be used to peel off the sediment deposited on the bottom of the accommodation part for the water returned to the accommodation part.

[0045]

[16] The separate flow path includes a third flow path different from the water intake flow path and the pipe, a first circulating state in which the water that has entered the water intake is caused to flow and returned to the accommodation part through the pipe and the plurality of hole parts; a second circulating state in which the water in the accommodation part is sucked into the pipe from the plurality of hole parts and returned to the accommodation part through the third flow path; and a third circulating state in which the water that has entered the water intake is caused to flow and returned to the accommodation part through the third flow path, and is provided with a flow part for switching between them The cleaning device according to any one of

[11] to

[15] .

[0046] The cleaning device of the above

[16] can realize a configuration that easily removes both relatively upper foreign matters and relatively lower foreign matters. Moreover, by switching between the first circulating state, the second circulating state, and the third circulating state, the function of peeling off the foreign matters deposited on the bottom of the water, the function of sucking in the foreign matters existing near the bottom of the water and returning the water to the accommodation part, and the function of sucking in the foreign matters existing relatively above and returning the water to the accommodation part can be switched.

[0047]

[17] It is provided with a removing part for removing foreign matters from the water before entering the third flow path, or the water in the third flow path, or the water that has flowed through the third flow path The cleaning device according to

[16] .

[0048] The cleaning device of the above

[17] can actively and efficiently remove foreign matters by the removing part, whether it is in the case of causing the second circulating state and sucking in the foreign matters existing near the bottom of the water, or in the case of causing the third circulating state and sucking in the foreign matters existing relatively above.

[0049]

[18] A pipe provided with a plurality of hole parts, A supply unit capable of performing a supply operation for supplying water, a shaft portion, using the supply unit is provided so as to communicate with the pipe, the pipe is arranged along the bottom of the storage unit for storing water and such that a plurality of the hole portions face the bottom side, the shaft portion is connected to the pipe so as to extend upward from the pipe, by supplying water to the pipe by the supply unit, the water in the pipe is discharged from the plurality of hole portions toward the bottom, the shaft portion and the pipe are rotated about a rotation axis along the shaft portion, thereby displacing the plurality of hole portions along the bottom cleaning method.

[0050] The cleaning method of the above

[18] can peel off deposits near the bottom by discharging water from a plurality of hole portions provided in a pipe near the bottom toward the bottom. And this cleaning method can peel off deposits deposited on the bottom from the bottom in a wider range because it moves a pipe having such a function along the bottom. Moreover, in the above cleaning method, since the pipe is moved along the bottom by rotating a shaft portion extending upward from the pipe about a rotation axis along the shaft portion, it is possible to suppress stirring a region above the vicinity of the bottom in the storage unit when the pipe moves. Therefore, the above cleaning method can effectively and widely peel off deposits deposited on the bottom while suppressing stirring a region above the vicinity of the bottom with a strong force.

[0051] 〔19〕 A pipe provided with a plurality of hole portions, a supply unit capable of performing a supply operation for supplying water, a suction unit capable of performing a suction operation for sucking water, a switching unit that switches between a first state in which the suction operation by the suction unit is stopped while allowing the supply operation by the supply unit and a second state in which the supply operation by the supply unit is stopped while allowing the suction operation by the suction unit, using The supply unit and the suction unit are provided so as to communicate with the pipe. The pipe is arranged along the bottom of the storage unit that stores water, and in such a manner that the plurality of hole portions face the bottom side. By switching the switching unit to the first state, the water supplied to the pipe by the supply unit is discharged from the plurality of hole portions toward the bottom of the water. By switching the switching unit to the second state, the water in the storage unit is sucked into the pipe from the plurality of hole portions. Cleaning method.

[0052] In the cleaning method of

[19] above, when the switching unit is in the first state, due to the operation of the supply unit, water can be discharged from the plurality of hole portions provided in the pipe near the bottom of the water toward the bottom of the water, and the deposits near the bottom of the water can be peeled off. Since the pipe is installed along the bottom of the water in this cleaning method, it is possible to peel off the deposits deposited on the bottom of the water while suppressing the stirring of the region above the vicinity of the bottom of the water with a strong force. On the other hand, in the above cleaning method, when the switching unit is switched to the second state, since the water in the storage unit can be sucked through the plurality of hole portions by the operation of the suction unit, the peeled deposits can be recovered and treated together with the water. The above cleaning method can be realized while simplifying the device configuration in water by using the common pipe and the switching unit together for the cleaning of peeling the bottom deposits while suppressing the stirring of the region above the vicinity of the bottom of the water with a strong force and the cleaning of recovering and treating the peeled deposits together with the water.

[0053] 〔20〕 A suction unit that communicates with the pipe and is capable of performing a suction operation of sucking water from the pipe, A switching unit that switches between a first state in which the suction operation by the suction unit is stopped while allowing the supply operation by the supply unit, and a second state in which the supply operation by the supply unit is stopped while allowing the suction operation by the suction unit, is used. When the switching unit is in the first state, the water supplied to the pipe by the supply unit is discharged from the plurality of hole portions toward the bottom of the water. When the switching unit is in the second state, water in the storage unit is sucked into the pipe from the plurality of holes The cleaning method according to

[18] .

[0054] In the cleaning method of the above

[20] , when the switching unit is in the first state, cleaning can be performed by discharging water from the holes toward the bottom of the water to peel off the bottom sediment from the bottom of the water. Moreover, this cleaning method combines the operation of discharging water toward the bottom of the water and the operation of rotating the shaft portion and the pipe around the rotation axis, so that the cleaning of peeling off the bottom sediment from the bottom of the water can be performed over a wide range while suppressing the strong agitation of the region above the vicinity of the bottom of the water. On the other hand, in the above cleaning method, when the switching unit is in the second state, since the water in the storage unit can be sucked through the plurality of holes by the operation of the suction unit, the peeled sediment can be collected and treated together with the water. Furthermore, this cleaning method combines the operation of sucking water through the plurality of holes and the operation of rotating the shaft portion and the pipe around the rotation axis, so that the cleaning of collecting and treating the peeled sediment together with the water can be performed over a wide range while suppressing the strong agitation of the region above the vicinity of the bottom of the water. Moreover, the above cleaning method can be realized while simplifying the device configuration in water by using the common pipe and the switching unit together for such characteristic cleaning.

[0055] 〔21〕 The storage unit has a peripheral wall disposed around the region for storing water and constituting the inner wall portion of the region, and a bottom wall provided on the lower end side of the peripheral wall. Use a holding unit that rotatably holds the shaft portion at a position close to the peripheral wall. The cleaning method according to any one of

[18] or

[20] .

[0056] In the cleaning method of the above

[21] , since the shaft portion can be rotatably held at a position close to the peripheral wall, it is possible to effectively suppress the strong agitation of the region on the central side of the storage unit when moving the plurality of holes along the bottom of the water.

[0057] 〔22〕In the tube, a plurality of first tubes arranged side by side to form a part of the tube, and one or more second tubes arranged at one or more boundaries of the plurality of first tubes are provided. It has flexibility, is connected to connect the ends of two adjacent first tubes, and the second tube is configured to communicate with the two first tubes to be connected respectively. The hole portion is provided at least in the first tube. The second tube is made deformable so that the orientation of the first tube connected to the other side of the second tube changes with respect to the orientation of the first tube connected to one side of the second tube. 〔18〕, 〔20〕, 〔21〕The cleaning method according to any one of them.

[0058] In the cleaning method of the above-mentioned 〔22〕, due to the presence of the second tube, the orientation of the first tube on the other side can change with respect to the orientation of the first tube on one side, so the whole tube is more likely to bend and it is easier to deform the overall shape of the tube according to the shape of the bottom of the water.

[0059] 〔23〕The hole portion is also provided in the second tube. The cleaning method according to 〔22〕.

[0060] In the cleaning method of the above-mentioned 〔23〕, by providing the hole portion also in the flexible second tube, the function can be enhanced.

[0061] 〔24〕The accommodating portion has a peripheral wall disposed around a region for accommodating water and constituting an inner wall portion of the region, and a bottom wall provided on the lower end side of the peripheral wall. The shaft portion is made movable along the peripheral wall. 〔18〕, 〔20〕, 〔21〕, 〔22〕, 〔23〕The cleaning method according to any one of them.

[0062] In the cleaning method of the above-mentioned 〔24〕, since the shaft portion is movable along the peripheral wall, the starting point of the rotation of the tube can be changed at the bottom of the water, and effects such as a wider range that the tube can reach and the ability to change the discharge direction of the hole portion can be expected.

[0063] 〔25〕 Use a holding part that holds the shaft part movably along the peripheral wall at a position near the peripheral wall. The cleaning method according to 〔24〕.

[0064] Since the cleaning method of the above 〔25〕 can move along the peripheral wall while maintaining the shaft part at a position near the peripheral wall, a configuration that can expand the range reached by the pipe while suppressing the agitation on the center side can be realized with a highly convenient configuration.

[0065] 〔26〕 A discharge path for discharging water into the storage part, a pump for sucking the water in the storage part through the plurality of hole parts and the pipe and sending it out toward the discharge path, and a filter part for removing foreign matters from the water sucked from the pipe in the water passage between the pipe and the discharge path, and configure the suction part to have these. The cleaning method according to any one of 〔19〕 and 〔20〕, or the cleaning method according to any one of 〔21〕 to 〔25〕 that directly or indirectly quotes 〔19〕, or the cleaning method according to any one of 〔21〕 to 〔25〕 that directly or indirectly quotes 〔20〕.

[0066] In the cleaning method of the above 〔26〕, when the water after the sediment near the bottom is peeled off by the discharge toward the bottom is sucked by the suction part, foreign matters can be removed from the sucked water and then the water can be returned to the storage part.

[0067] 〔27〕 Configure the supply part to have a water intake path for introducing the water in the storage part and a pump for sucking the water in the storage part through the water intake path and sending it out to the pipe. The cleaning method according to any one of 〔19〕, 〔20〕, and 〔26〕, or the cleaning method according to any one of 〔21〕 to 〔25〕 that directly or indirectly quotes 〔19〕, or the cleaning method according to any one of 〔21〕 to 〔25〕 that directly or indirectly quotes 〔20〕.

[0068] The cleaning method of the above

[27] has a circulation structure that draws water from inside the storage part and sends the water to the pipe near the bottom, and can perform cleaning to discharge water from a plurality of holes to the bottom.

[0069] 〔28〕 A pipe provided with a plurality of holes, A supply part capable of performing a supply operation for supplying water, A water intake that is a part for taking in the water inside the storage part, A water intake passage for guiding the water that has entered the water intake, A guiding part for guiding the water guided by the water intake passage, Using, The pipe is arranged along the bottom of the storage part for storing water, and the plurality of holes face the bottom side. The supply part is provided so as to communicate with the pipe. The water intake is arranged above the pipe inside the storage part. In a state where the guiding part is arranged to guide the water guided by the water intake passage to a different flow path from the water intake passage, Performing an operation of displacing the plurality of holes along the bottom and an operation of guiding the water guided by the water intake passage to the different flow path simultaneously or at different times Cleaning method.

[0070] The cleaning method of the above

[28] can peel off the sediment deposited on the bottom while suppressing the strong stirring of the area above the vicinity of the bottom, and further, can take in the water inside the storage part from the water intake arranged above the pipe to remove foreign matters. Therefore, it can correspond to both the area near the bottom and the area above the pipe.

[0071] 〔29〕 The water intake is arranged at a predetermined height inside the storage part, and takes in the overflow water exceeding the predetermined height inside the storage part The cleaning method according to

[28] .

[0072] The cleaning method of the above

[29] can take in overflow water exceeding a predetermined height in the storage section, so that foreign matter floating near the surface of the water stored in the storage section and foreign matter gathered near the surface can be effectively removed.

[0073] 〔30〕The flow section causes at least a first flow state in which the water that has entered the water intake is made to flow and returned to the storage section from a path different from the water intake, and a second flow state in which the water in the storage section is sucked into the pipe from a plurality of the hole portions and returned to the storage section from a path different from the plurality of the hole portions. The cleaning method according to

[28] or

[29] .

[0074] The cleaning method of the above

[30] can, in addition to the function of peeling off the sediment deposited on the bottom of the water, realize a characteristic circulation in which the water in the storage section is allowed to enter and flow through the water intake located relatively above, and a function of switching between a characteristic circulation in which the water is sucked into the pipe from a plurality of hole portions located relatively below and caused to flow.

[0075] 〔31〕The first flow state includes a circulation state in which the water that has entered the water intake is made to flow and returned to the storage section from a plurality of the hole portions. The cleaning method according to

[30] .

[0076] The cleaning method of the above

[31] can be used to peel off the sediment deposited on the bottom of the water when performing a characteristic circulation in which the water in the storage section is allowed to enter and flow through the water intake located relatively above.

[0077] 〔32〕The separate flow path includes a third flow path different from the water intake flow path and the pipe. The flow section switches between a first circulation state in which the water that has entered the water intake is made to flow and returned to the storage section through the pipe and a plurality of the hole portions, a second circulation state in which the water in the storage section is sucked into the pipe from a plurality of the hole portions and returned to the storage section through the third flow path, and a third circulation state in which the water that has entered the water intake is made to flow and returned to the storage section through the third flow path. The cleaning method according to any one of

[28] to

[31] .

[0078] The above cleaning method of

[32] can easily remove both the foreign matter on the relatively upper side and the foreign matter on the relatively lower side, and by switching between the first circulation state, the second circulation state, and the third circulation state, it has the function of peeling off the foreign matter deposited on the bottom of the water, the function of sucking the foreign matter existing near the bottom of the water and returning the water to the inside of the accommodating portion, and the function of sucking the foreign matter existing on the relatively upper side and returning the water to the inside of the accommodating portion, and can be switched.

[0079] 〔33〕 Remove foreign matter from the water before entering the third flow path, or the water in the third flow path, or the water that has flowed through the third flow path, by the removing portion The cleaning method according to

[32] .

[0080] The above cleaning method of

[33] can actively and efficiently remove foreign matter by the removing portion, whether it is in the case of generating the second circulation state and sucking the foreign matter existing near the bottom of the water, or in the case of generating the third circulation state and sucking the foreign matter existing on the relatively upper side.

[0081] 〔34〕 Applied to a circulation type water treatment system that circulates the breeding water in a tank for breeding aquatic organisms and containing salt-containing breeding water after treating the breeding water outside the breeding tank and then returning the treated breeding water to the breeding tank. The circulation type treatment system has a solid matter removing portion for removing at least solid matter in a first region where the breeding water sent from the breeding tank is stored or flows. The solid matter removing portion includes a foam separator that generates foam containing ozone generated by the ozone generating portion and adsorbs the solid matter contained in the breeding water in the first region to the foam. The breeding tank is the accommodating portion The cleaning device according to any one of

[11] to

[17] .

[0082] 〔35〕A circulating water treatment system including any one of 〔1〕 to 〔17〕 or the cleaning device described in 〔34〕.

[0083] 〔36〕Applied to a circulating water treatment system that circulates the breeding water in a breeding tank that breeds aquatic organisms and contains saline breeding water after treating the breeding water outside the breeding tank and then returning the treated breeding water to the breeding tank, the circulating treatment system has a solid matter removal part that removes at least solid matter in a first area where the breeding water sent from the breeding tank is stored or flows. The solid matter removal part is provided with a foam separator that generates foam containing ozone generated by the ozone generation part and adsorbs the solid matter contained in the breeding water in the first area to the foam. Using the breeding tank as the storage part 〔28〕The cleaning method according to any one of 〔33〕.

[0084] The above cleaning device of 〔34〕 and the cleaning method of 〔36〕 can effectively remove not only foreign matters (such as feed and feces) near the bottom of the breeding tank but also foreign matters (such as oil, protein foam, and sebum) existing near the water surface at the breeding tank stage. Therefore, when removing foreign matters in the subsequent foam separator, the removal effect of the foam separator can be enhanced. For example, among the foreign matters existing near the water surface, it is possible to make it less likely to cause a situation where foam separation cannot be sufficiently performed due to a large amount of oil.

[0085] <First Embodiment> 1. Outline of the cleaning device Figure 1 schematically shows a cleaning device 100 according to the first embodiment. The cleaning device 100 includes a pipe 110 installed along the bottom 190 of a housing part 180 that stores water Wa, a water flow adjustment part 130 that communicates with the pipe 110 and is an example of a supply part capable of performing a supply operation of supplying water to the pipe 110, and a shaft part 120 connected to the pipe 110 and extending upward from the pipe 110. The pipe 110 is provided with a plurality of hole parts 116 (FIG. 7) that function as nozzles for discharging the water in the pipe 110 toward the bottom 190. In the cleaning device 100, the shaft part 120 and the pipe 110 are rotatable about a rotation axis X along the shaft part 120, and when the shaft part 120 and the pipe 110 rotate about the rotation axis X, the plurality of hole parts 116 move along the bottom 190. The housing part 180 may be a tank (for example, a breeding tank, etc.) of an aquaculture system Sy (FIG. 2) described later, or may be other housing parts capable of storing water.

[0086] In addition to the water flow adjustment part 130, the cleaning device 100 has a switching part 104. The water flow adjustment part 130 corresponds to an example of a suction part. The water flow adjustment part 130 communicates with the pipe 110 and is capable of performing a suction operation of sucking water from the pipe 110. The switching part 104 switches between a first state in which the suction operation by the suction part (water flow adjustment part 130) is stopped while allowing the supply operation by the supply part (water flow adjustment part 130), and a second state in which the supply operation by the supply part (water flow adjustment part 130) is stopped while allowing the suction operation by the suction part (water flow adjustment part 130). When the switching part 104 is in the first state, the cleaning device 100 discharges the water supplied to the pipe 110 by the supply part (water flow adjustment part 130) from the plurality of hole parts 116 toward the bottom 190, and when the switching part 104 is in the second state, the cleaning device 100 sucks the water in the housing part 180 into the pipe 110 from the plurality of hole parts 116. Details of the configuration and operation of the cleaning device 100 will be described later.

[0087] 2. Aquaculture System Sy as an Example of the Object to be Cleaned The cleaning device 100 and the cleaning method of the present embodiment can be applied to the following aquaculture system Sy. The aquaculture system Sy illustrated in FIG. 2 is mainly composed of a circulating water treatment system 1. The aquaculture system Sy may be composed only of the circulating water treatment system 1, or may be composed in a form in which some elements are added to the circulating water treatment system 1. The circulating water treatment system 1 in FIG. 2 is a system used for aquaculture of aquatic organisms. The circulating water treatment system 1 is configured as a closed-loop aquaculture system that circulates the breeding water in the breeding tank 3 containing the breeding water containing salt after treating the breeding water outside the breeding tank 3 and then returning the treated breeding water to the breeding tank 3, and is a method of recycling water. When aquaculture of aquatic organisms is carried out in the breeding tank 3, the circulating water treatment system 1 operates to decompose and purify the residual feed and feces discharged by the organisms remaining in the breeding water during the breeding in the breeding tank 3 in the process until the water is circulated from the breeding tank 3 and returned to the breeding tank 3 again while continuously breeding the aquatic organisms inside the breeding tank 3.

[0088] As shown in FIG. 2, the circulating water treatment system 1 mainly includes a breeding tank 3, a removal unit 5, an electrolysis tank 11, a reaction tank 15, a filtration tank 17, an activated carbon tank 21, a standby tank (water quality adjustment tank) 25, a treatment unit 31, etc. Further, the circulating water treatment system 1 also includes a temperature controller 35, a filter 37, etc. The electrical configuration of the circulating water treatment system 1 is, for example, as shown in FIG. 3. The types of aquatic organisms that can be bred inside the breeding tank 3 are various. For example, fish, crustaceans, shellfish, etc. are cited as preferred examples, and other types (for example, squid, octopus, etc.) may also be used.

[0089] (Breeding tank) The breeding tank 3 shown in Fig. 2 is a tank for breeding and cultivating aquatic organisms. Inside the breeding tank 3, breeding water containing salts such as artificial seawater or natural seawater is stored, and aquatic organisms such as fish and shellfish are bred in this breeding water. Note that the "breeding water containing salts" stored in the breeding tank 3 is preferably a liquid with an NaCl content of 0.5% by mass or more. In the example of Fig. 2, a plurality (for example, four) of breeding tanks 3 are provided, and the breeding water in these breeding tanks 3 is guided to be collected in the filter 37 and filtered by the filter 37, and internally circulates so as to be distributed from the filter 37 to the plurality of breeding tanks 3. The water temperature of the breeding water in the breeding tank 3 is adjusted to a desired set temperature by the temperature control machine 35. In the example of Fig. 2, a plurality of breeding tanks 3 are used in the aquaculture system Sy, but the breeding tank may be constituted by a single water tank.

[0090] (Removal part) The removal part 5 shown in Fig. 2 corresponds to an example of a solid matter removal part, and functions to remove solids and the like contained in the breeding water in the first region where the breeding water sent from the breeding tank 3 is stored or flows. The breeding water in the breeding tank 3 is guided to the removal part 5 (solid matter removal part) through the flow path 41. As shown in Fig. 4, the removal part 5 includes an ozone generator 9, a foam separator 7, a storage tank 60, an introduction part 62, a lead-out part 64, and a discharge part 66. In Fig. 3 and the like, the symbol W conceptually indicates a part of the circulating breeding water.

[0091] The storage tank 60 is a tank for storing the breeding water introduced from the area of the previous process of the removal part 5. In the example of Fig. 2, the area of the previous process of the removal part 5 is the area inside the breeding tank 3. The method of flowing the breeding water from the breeding tank 3 to the storage tank 60 may be a method of flowing it using a pump, or a method of flowing it using a height difference.

[0092] The ozone generator 9 generates ozone by, for example, a known method and supplies the generated ozone to the foam separator 7. The foam separator 7 generates foam containing ozone generated by the ozone generator 9 and operates to adsorb solids contained in the breeding water in the first region where the breeding water sent from the breeding tank 3 is stored or flows onto the foam. The introduction part 62 is a flow path for introducing the breeding water stored in the storage tank 60 into the interior of the foam separator 7. The discharge part 64 is a flow path for returning the breeding water that has passed through the foam separator 7 from the foam separator 7 to the storage tank 60. The discharge part 66 has a flow path for discharging the breeding water stored in the storage tank 60 to the region of the subsequent process of the removing part 5. In the examples of FIGS. 2 and 3, the region of the subsequent process of the removing part 5 is the region inside the electrolysis tank 11.

[0093] In the removing part 5, solids such as feces and uneaten feed contained in the breeding water introduced into the foam separator 7, removal proteins of metabolites of fish and shellfish, bacteria, viruses, parasites, etc. are attached to the fine bubbles generated in the foam separator 7 and removed from the breeding water.

[0094] (Electrolysis tank) The electrolysis tank 11 shown in FIG. 5 is a tank for performing electrolysis and is a tank in which the breeding water that has passed through the removing part 5 is stored or flows. The internal region of the electrolysis tank 11 is a region in which the breeding water that has passed through the above-described first region (in the example of FIG. 4, the region inside the storage tank 60) is stored or flows and corresponds to an example of the second region. An electrolysis part 13 is provided in the electrolysis tank 11. The electrolysis part 13 generates a chloric acid compound (for example, sodium hypochlorite) by electrolyzing the breeding water in the second region, reacts the generated chloric acid compound with ammonia or ammonium ions in the breeding water, and decomposes the ammonia or ammonium ions. Further, in the electrolysis tank 11, since a chloric acid compound is generated by the electrolysis part 13, sterilization, deodorization, and decolorization of the breeding water can be performed.

[0095] In the electrolysis tank 11, electrolysis shown by the following formula (1) is performed. 2NaCl + 3H2O → NaClO + NaCl + 2H2O + H2↑ ··· (1)

[0096] Then, the decomposition of ammonia or the decomposition of ammonium ions is carried out by the chemical reactions shown in the following formulas (2) and (3). 2NH3 + 3NaClO → N2↑ + 3NaCl + 3H2O ···(2) 2NH4 + + 3NaClO → N2↑ + 3H2O + 3NaCl + 2H + ···(3)

[0097] In the electrolytic cell 11 shown in FIG. 5, the internal region of the electrolytic cell 11 is a "region" where the electrode part 55 is arranged and electrolysis is carried out. The electrolytic cell 11 is provided with an electrolysis part 13. The electrolysis part 13 has an electrode part 55 having a first electrode 55A and a second electrode 55B arranged in the above "region" (second region), and a voltage application part 51 for applying a voltage between the electrodes of the first electrode 55A and the second electrode 55B. The voltage application part 51 has a control device 52 and a drive circuit 53. The control device 52 is an information processing device having an information processing part, a storage part, a communication part, etc., and is a device capable of performing various controls and various calculations. The drive circuit 53 is a circuit for applying a voltage between the electrodes of the first electrode 55A and the second electrode 55B in response to a command from the control device 52.

[0098] The electrode unit 55 includes an electrode holding unit 55C that holds the first electrode 55A and the second electrode 55B, and the first electrode 55A, the second electrode 55B, and the electrode holding unit 55C are integrally formed. The integrally formed electrode unit 55 is detachable from the electrolysis cell 11. In the example of FIG. 5, a plurality of first electrodes 55A and a plurality of second electrodes 55B are provided, and all of the plurality of first electrodes 55A and the plurality of second electrodes 55B are formed in a plate shape by a metal material. In the electrode unit 55, the first electrodes 55A and the second electrodes 55B are alternately arranged at intervals. The plurality of first electrodes 55A are configured to be short-circuited to each other and are electrically connected to the first terminal of the drive circuit 53 via the conductive path 54A. The plurality of second electrodes 55B are configured to be short-circuited to each other and are electrically connected to the second terminal of the drive circuit 53 via the conductive path 54B. Part or all of the electrode unit 55 is arranged on the water surface W2 side of the breeding water in the electrolysis cell 11 so that the breeding water is interposed between the first electrode 55A and the second electrode 55B.

[0099] The electrolysis cell 11 is provided with a water flow generating unit 57 that generates a water flow from the lower side to the upper side (electrode unit side) of the electrode unit 55. The water flow generating unit 57 has a structure that causes the breeding water introduced into the electrolysis cell 11 from the outside of the electrolysis cell 11 through the flow path 42 to flow so as to rise from the lower side to the upper side of the electrode unit 55 in the electrolysis cell 11. The flow path 42 is a flow path that allows the breeding water discharged through the discharge part 66 (FIG. 4) to flow into the electrolysis cell 11, and may be constituted by the discharge part 66 or may be constituted as a flow path following the discharge part 66. The water flow generating unit 57 has a first partition wall 57A. The first partition wall 57A is a wall that partitions a predetermined upstream region and a predetermined downstream region in the electrolysis cell 11. The downstream region is a region downstream of the first partition wall 57A and is a region where the electrode unit 55 is provided. The upstream region is a region upstream of the first partition wall 57A and upstream of the downstream region.

[0100] In the example of Fig. 5, the upstream region is the internal region of the first breeding water flow chamber 11A formed by the first partition wall 57A and the portions of the outer peripheral wall and the bottom wall of the electrolysis cell 11 upstream of the first partition wall 57A, and is the region into which breeding water flows from the flow path 42. In the first breeding water flow chamber 11A, an opening for moving the breeding water in the first breeding water flow chamber 11A to the second breeding water flow chamber is provided on the bottom wall side. In the example of Fig. 5, the opening is formed by the lower end portion of the first partition wall 57A and the outer peripheral wall and the bottom wall of the electrolysis cell 11. The downstream region is the internal region of the second breeding water flow chamber 11B formed by the first partition wall 57A, the second partition wall 57B, and the portion between the first partition wall 57A and the second partition wall 57B in the outer peripheral wall and the bottom wall 11Z of the electrolysis cell 11, and is the region where part or all of the electrode portion 55 is arranged. In the second breeding water flow chamber 11B, the height of the upper end portion of the second partition wall 57B is lower than the height of the upper end portion of the outer peripheral wall of the electrolysis cell 11. When water exceeding the upper end portion of the second partition wall 57B enters the second breeding water flow chamber 11B, the water flows to the downstream side of the second breeding water flow chamber 11B beyond the second partition wall 57B. Due to this configuration, in the second breeding water flow chamber 11B, the breeding water is introduced from the lower opening, and the breeding water is led out so as to exceed the upper end portion of the second partition wall 57B. Therefore, a water flow of the breeding water is generated so as to rise from below the electrode portion 55 toward the electrode portion 55 side.

[0101] Note that in the example of Fig. 5, the second partition wall 57B is provided, but the second partition wall 57B may not be provided. In this case, the entire downstream side of the first partition wall 57A in the electrolysis cell 11 is the downstream region, and the second breeding water flow chamber 11B is formed by the first partition wall 57A and the portions of the outer peripheral wall and the bottom wall of the electrolysis cell 11 downstream of the first partition wall 57A.

[0102] As shown in Fig. 5, the electrolysis cell 11 is provided with a discharge part 59. In the example of Fig. 5, the discharge part 59 is provided at two locations. The discharge part 59 mainly has a pipe 59A used for discharging the deposits that have settled from the electrode part 55 in the electrolysis cell 11, and an opening / closing part 59B for opening and closing this pipe 59A. The discharge part 59 functions to take in the deposits into the inside of the pipe 59A at a position lower than the electrode part 55 and discharge the deposits from the electrolysis cell 11 through the pipe 59A. In the example of Fig. 5, the opening / closing part 59B is an opening / closing plug that switches the pipe 59A between a blocked state and an open state by, for example, manual operation. Note that the opening / closing part 59B may be a solenoid valve or the like whose opening and closing are switched by control.

[0103] As shown in Fig. 5, the electrolysis cell 11 is provided with a first guiding path 56. The first guiding path 56 functions as a flow path so as not to guide the water located below the first height in the electrolysis cell 11 to the outside of the electrolysis cell 11, but to guide the water located above the first height to the outside of the electrolysis cell 11. In the example of Fig. 5, the water surface W2 of the breeding water in the electrolysis cell 11 is located above the lower end position of the inner wall surface of the flow path at the entrance of the first guiding path 56 (the boundary part with the first guiding path 56 which is the outlet of the electrolysis cell 11), and the water near the water surface of the breeding water in the electrolysis cell 11 flows into the first guiding path 56 exceeding the height of the bottom of the first guiding path 56. The first guiding path 56 functions to flow the breeding water in the electrolysis cell 11 toward the reaction tank 15.

[0104] (Reaction tank) Reaction tank 15 is a tank that stores rearing water supplied from electrolysis tank 11 through flow path 43, ensures time for reaction between ammonia or ammonium ions contained in the stored rearing water and chloric acid compounds (e.g., sodium hypochlorite) generated in electrolysis tank 11, and promotes their chemical reaction. Flow path 43 may be formed by first induction path 56, or may be formed as a flow path continuing to first induction path 56. When all of the ammonia or ammonium ions present in the rearing water in electrolysis tank 11 are not able to completely react with the chloric acid compounds in electrolysis tank 11 and flow out of electrolysis tank 11, and when the chloric acid compounds generated in electrolysis tank 11 are not able to completely react and flow out of electrolysis tank 11, either or both of the chemical reactions represented by the above formula (2) and / or the above formula (3) occur in reaction tank 15, and the ammonia or ammonium ions are decomposed. 5, the second guide path 72 provided in the reaction tank 15 functions as a flow path so as not to guide water located below the second height in the reaction tank 15 to the outside of the reaction tank 15, but to guide water located above the second height to the outside of the reaction tank 15. The second guide path 72 functions to flow the rearing water in the reaction tank 15 toward a downstream process in the reaction tank 15.

[0105] (Filtration tank) As shown in FIG. 2, a filtration tank 17 constituting a detection area for detecting residual chlorine is provided downstream of the reaction tank 15. The filtration tank 17 is configured to store rearing water supplied from the reaction tank 15 through a flow path 44, lead the rearing water to a flow path 45, and supply the rearing water to the activated carbon tank 21 through the flow path 45. The flow path 45 may be formed by the second guide path 72 (FIG. 5), or may be configured as a flow path continuing to the second guide path 72. In the example of FIG. 2, the first residual chlorine sensor 19 is a sensor that detects the concentration of residual chlorine contained in the rearing water from passing through the electrolysis tank 11 to flowing into the residual chlorine removal tank (specifically, the activated carbon tank 21), and in the example of FIG. 2, the first residual chlorine sensor 19 detects the concentration of residual chlorine in the filtration tank 17.

[0106] (Residual chlorine removal tank) In the example of FIG. 5, an activated carbon tank 21 is provided as an example of a residual chlorine removal tank. The residual chlorine removal tank is a tank that removes at least residual chlorine from the breeding water, and functions to remove residual chlorine from the breeding water by passing the breeding water through the residual chlorine removal section. The activated carbon tank 21 functions as a tank that removes chlorine acid compounds (for example, sodium hypochlorite) generated in the electrolytic cell 11. The activated carbon tank 21 is provided with an activated carbon section 23 equipped with activated carbon. The activated carbon section 23 removes at least residual chlorine and residual ozone from the breeding water in the activated carbon tank 21 by means of the activated carbon.

[0107] (Standby tank) The breeding water introduced into the activated carbon tank 21 from the flow path 45 passes through the internal area of the activated carbon tank 21 and is discharged to the flow path 46, and flows into the standby tank 25 through the flow path 46. The standby tank 25 is a tank in which the breeding water that has passed through the activated carbon tank 21 is stored and the water quality before returning to the breeding tank 3 is inspected. The internal area of the standby tank 25 corresponds to an example of the fourth area, and is an area where the breeding water that has passed through the area (the third area) in the residual chlorine removal tank is stored or flows before returning to the breeding tank 3. In the fourth area (the area in the standby tank 25 in the example of FIG. 2), a second residual chlorine sensor 27, an ammonium ion sensor 29, a pH sensor 28, etc. are provided. In the standby tank 25, aeration is performed by an aeration device (not shown) to remove CO2 from the breeding water. The breeding water in the standby tank 25 flows into the breeding tank 3 through the flow path 47. The operation of flowing the breeding water from the standby tank 25 to the breeding tank 3 via the flow path 47 can be switched between a state of continuously flowing the breeding water from the standby tank 25 to the breeding tank 3 and a state of stopping or blocking the flow of the breeding water from the standby tank 25 to the breeding tank 3.

[0108] 3. Details of the housing part 180 FIG. 1 and FIG. 6 show a housing part 180 that houses water Wa. The housing part 180 is an object to be cleaned by the cleaning device 100, for example, the above-mentioned breeding tank 3. The housing part 180 may be other than the breeding tank 3, and a part or all of the storage tank 60, the electrolytic cell 11, the reaction tank 15, the filtration tank 17, the activated carbon tank 21, and the standby tank 25 may correspond to the housing part 180.

[0109] As shown in FIGS. 1 and 6, the storage portion 180 includes a peripheral wall 182 and a bottom wall 184. The peripheral wall 182 is a wall portion configured to surround the region for storing the water Wa around the region. The peripheral wall 182 constitutes an inner wall portion of the storage space for storing the water Wa. The inner wall surface of the peripheral wall 182 constitutes the inner wall surface of the storage space, and this inner wall surface functions as a wall surface that comes into contact with the water Wa when the water Wa is stored in the storage portion 180. In the examples of FIGS. 1 and 6, the peripheral wall 182 is configured as a cylindrical wall.

[0110] As shown in FIGS. 1 and 6, the bottom wall 184 is disposed below the region for storing the water Wa and functions as the lower wall portion of the region. The bottom wall 184 is provided on the lower end side of the peripheral wall 182. The bottom wall 184 is configured to be integrally connected to the inner wall portion of the peripheral wall 182 and to close the lower end side of the peripheral wall 182. The bottom wall 184 is configured to support the water Wa stored in the storage portion 180 from below and constitutes the water bottom 190 when the water Wa is stored in the storage portion 180. The water bottom 190 is the upper surface portion that constitutes the upper surface of the bottom wall 184. The upper surface of the water bottom 190 functions as the bottom surface of the storage portion 180 and functions as a surface that comes into contact with the water Wa when the water Wa is stored in the storage portion 180. In this specification, the vertical direction is the up and down direction, and the direction orthogonal to the vertical direction is the horizontal direction. In the examples of FIGS. 1 and 6, the direction of most or all of the region of the upper surface of the water bottom 190 is the horizontal direction. At a position close to the shaft portion 120, the inner wall surface of the peripheral wall 182 rises along the vertical direction.

[0111] 4. Basic Configuration of the Cleaning Device FIGS. 1 and 6 show an example of the cleaning device 100. In the examples of FIGS. 1 and 6, the cleaning device 100 functions to clean the inside of the storage portion 180. The cleaning device 100 includes a water discharge portion 102 disposed in the storage portion 180, a water flow adjustment portion 130 for adjusting the water flow of the water discharge portion 102, a water intake path portion 162, a water discharge path portion 164, a guiding path 166, and a filter portion 138.

[0112] The water discharge part 102 includes a pipe 110 and a shaft part 120. The water discharge part 102 has a function as a discharge path for discharging water from the pipe 110 into the storage part 180 and a function as a water intake path for taking in the water in the storage part 180 from the pipe 110. Details of the water discharge part 102 will be described later.

[0113] A guiding path 166 is connected to the water discharge part 102. The guiding path 166 is configured as, for example, a guiding pipe and as a flow path for flowing water. The flow path in the guiding path 166 communicates with the flow path in the water discharge part 102. When the water discharge part 102 functions as a path for discharging water, the guiding path 166 functions as a flow path for guiding the water sent from the water flow adjustment part 130 into the water discharge part 102. When the water discharge part 102 functions as a path for sucking water, the guiding path 166 functions as a path for guiding the water sent from the water discharge part 102 into the water flow adjustment part 130. One end of the guiding path 166 is connected to the shaft part 120, and the flow path in the guiding path 166 communicates with the flow path in the shaft part 120 so that water can flow between them. The other end of the guiding path 166 is connected to the flow path 108G in the water flow adjustment part 130, and water can flow between the guiding path 166 and the flow path 108G. Note that the guiding path 166 and the flow path 108G may be configured by separate members or may be integrally configured by the same member.

[0114] The water intake path section 162 functions as a path for guiding the water in the accommodation section 180 to the water flow adjustment section 130. In the example of FIG. 6, the water intake path section 162 includes a water intake pipe 162A and an intermediate pipe 162B. The water intake pipe 162A has an opening at its end that functions as a water intake port, and this opening (water intake port) is disposed in the water Wa within the accommodation section 180. The intermediate pipe 162B is a pipe with one end connected to the water intake pipe 162A and the other end connected to the valve 104B. Note that the water intake pipe 162A and the intermediate pipe 162B may be constituted by separate members or may be integrally constituted by the same member. The water intake path section 162 functions as a path for flowing water from the accommodation section 180 to the valve 104B when the valve 104B is in an open state and is driven by the pump 132 to flow water from the valve 104B to the pump 132. Specifically, the water in the accommodation section 180 can be introduced from the opening of the water intake pipe 162A and flow through the water intake pipe 162A and the intermediate pipe 162B to the valve 104B.

[0115] The water discharge path section 164 corresponds to an example of a discharge path. The water discharge path section 164 is a path for discharging water into the accommodation section 180 and is configured as a path different from the water discharge section 102. The water discharge path section 164 includes a water discharge pipe 164A and an intermediate pipe 164B. One end of the water discharge pipe 164A is connected to the filter section 138. The water that has flowed from the water discharge pipe 164A to the filter section 138 is configured to flow through the filter section 138 and into the accommodation section 180. One end of the intermediate pipe 164B is connected to the other end side of the water discharge pipe 164A, and water can flow from the intermediate pipe 164B to the water discharge pipe 164A. The other end of the intermediate pipe 164B is connected to the valve 104D. Note that the water discharge pipe 164A and the intermediate pipe 164B may be constituted by separate members or may be integrally constituted by the same member. The water discharge path section 164 functions as a path for flowing water from the valve 104D to the filter section 138 when the valve 104D is in an open state and water is sent out to the valve 104D by the pump 132.

[0116] The filter unit 138 functions as a filter that removes foreign matter from the water sucked from the pipe 110 in the water passage on the downstream side of the water discharge passage unit 164 (discharge passage). The water sent from the water discharge passage unit 164 to the filter unit 138 is supplied into the storage unit 180 through the filter unit 138. The water is filtered in the process of passing through the filter unit 138, and solids (for example, solids sucked from the pipe 110 after being peeled off from the bottom 190) contained in the water sent to the filter unit 138 are removed. The filter unit 138 may have, for example, a fibrous mat, a mesh, a cartridge filter, a sand filter, etc.

[0117] As shown in FIG. 6, the water flow adjustment unit 130 includes a pump 132, flow paths 108D, 108E, 108F, 108G, and valves 104A, 104B, 104C, 104D. The water flow adjustment unit 130 corresponds to an example of a supply unit. The water flow adjustment unit 130 communicates with the pipe 110 and is capable of performing a supply operation of supplying water to the pipe 110. Further, the water flow adjustment unit 130 corresponds to an example of a suction unit. The water flow adjustment unit 130 communicates with the pipe 110 and is capable of performing a suction operation of sucking water from the pipe 110. The water flow adjustment unit 130 communicates with the water discharge unit 102 via the guiding path 166. When the switching unit 104 described later is in the first state, the water flow adjustment unit 130 operates to supply water to the water discharge unit 102 via the guiding path 166. When the switching unit 104 is in the second state, the water flow adjustment unit 130 operates to suck the water in the storage unit 180 via the water discharge unit 102 and the guiding path 166.

[0118] The pump 132 has a function of forcibly flowing water. In the example of FIG. 6, the pump 132 forcibly flows water from the side of the flow path 108D to the side of the flow path 108E. When the switching unit 104 is in the first state, the pump 132 functions to suck the water in the storage unit 180 through the water intake path unit 162 and send out the sucked water to the water discharge unit 102 via the guiding path 166. When the switching unit 104 is in the second state, the pump 132 functions to suck the water in the storage unit 180 through the plurality of hole portions 116 (FIG. 7) and the pipe 110 and send it out toward the water discharge path unit 164 (discharge path).

[0119] The switching unit 104 has a function of switching the water flow in the water flow adjustment unit 130. The switching unit 104 has a first state in which the suction operation through the water discharge unit 102 by the water flow adjustment unit 130 (suction unit) is stopped while allowing the supply operation through the water discharge unit 102 by the water flow adjustment unit 130 (supply unit), and a second state in which the supply operation through the water discharge unit 102 by the water flow adjustment unit 130 (supply unit) is stopped while allowing the suction operation through the water discharge unit 102 by the water flow adjustment unit 130 (suction unit). When the switching unit 104 is in the first state, as shown in FIG. 9, the operation of supplying water into the pipe 110 by the water flow adjustment unit 130 (supply unit) becomes possible, and the water supplied to the pipe 110 by the water flow adjustment unit 130 is discharged from the plurality of hole portions 116 toward the bottom 190. When the switching unit 104 is in the second state, as shown in FIG. 10, the operation of sucking water from the inside of the pipe 110 by the water flow adjustment unit 130 becomes possible, and when the water in the pipe 110 is sucked by the water flow adjustment unit 130, the water in the storage unit 180 is sucked into the pipe 110 from the plurality of hole portions 116.

[0120] In the switching unit 104, the valves 104A, 104B, 104C, and 104D may be configured as electromagnetic valves or may be configured as manual valves. The valves 104A, 104B, 104C, and 104D are all configured as on-off valves, and each valve permits the flow of water passing through itself when the valve is in the open state and prohibits the flow of water passing through itself when the valve is in the closed state.

[0121] When the switching unit 104 is in the first state as shown in FIG. 9, the valves 104A and 104D are in the closed state, and they block the flow in the flow paths where they are provided. When the switching unit 104 is in the first state, the valves 104B and 104C are in the open state, and they allow the flow in the flow paths where they are provided. When the switching unit 104 is in the first state and the pump 132 flows as shown in FIG. 9, the water in the storage unit 180 is sucked into the pump 132 through the water intake path unit 162, the valve 104B, and the flow path 108D. The sucked water is supplied to the water discharge unit 102 through the flow paths 108E, 108F, the valve 104C, and the guiding path 166 by the driving of the pump 132. Therefore, when water is supplied into the water discharge unit 102 by the water flow adjustment unit 130 in this way, the water supplied into the water discharge unit 102 flows into the pipe 110 through the shaft portion 120, and the water flowing from the shaft portion 120 into the pipe 110 is discharged toward the bottom 190 from a plurality of hole portions 116 (FIGS. 7 and 8).

[0122] When the switching unit 104 is in the second state as shown in FIG. 10, the valves 104A and 104D are in the open state, and they allow the flow in the flow paths where they are provided. When the switching unit 104 is in the second state, the valves 104B and 104C are in the closed state, and they block the flow in the flow paths where they are provided. When the switching unit 104 is in the second state and the pump 132 flows as shown in FIG. 10, the water in the storage unit 180 is sucked into the pump 132 through the water discharge unit 102, the guiding path 166, the flow path 108G, the valve 104A, and the flow path 108D. The sucked water is discharged into the storage unit 180 through the flow paths 108E, the valve 104D, the water discharge path unit 164, and the filter unit 138 by the driving of the pump 132.

[0123] 5. Detailed Structure of the Water Discharge Unit 102 The water discharge part 102 has a configuration in which the pipe 110 and the shaft part 120 are integrally connected. In the examples of FIGS. 1 and 6, the direction in which the shaft part 120 extends is the vertical direction. Specifically, the shaft part 120 extends in a direction along the inner wall surface of the peripheral wall 182. Note that the direction in which the shaft part 120 extends is not limited to the vertical direction and may be slightly inclined with respect to the vertical direction. Also, the shaft part 120 may always extend in a specific direction, or the extending direction may be slightly changeable. For example, the shaft part 120 may be displaceable such that the angle formed between the extending direction of the shaft part 120 and the vertical direction is within a predetermined range (for example, within the range of 0° to 20°). The shaft part 120 is configured in a rod shape and a cylindrical shape, and forms a form in which an elongated shape extending linearly in a predetermined direction is continuously maintained. The shaft part 120 is rotatable about a rotation axis X along the shaft part 120. The outer peripheral surface of the shaft part 120 is rotatable in the circumferential direction of the outer peripheral surface. The lower end of the shaft part 120 is disposed near the water bottom 190, and while maintaining a state in which the shaft part 120 extends upward from near the water bottom 190 (a rising state) such that the upper end of the shaft part 120 is located above the lower end, the water discharge part 102 rotates about the shaft part 120, whereby the pipe 110 rotates integrally with the shaft part 120 and moves along the water bottom 190.

[0124] The pipe 110 has a form in which it extends in a direction different from the direction in which the pipe 110 extends from a predetermined position near the lower end of the shaft part 120. The pipe 110 is installed along the water bottom 190 of the housing part 180 that houses the water Wa. The direction in which the pipe 110 extends may be the horizontal direction or a direction slightly inclined with respect to the horizontal direction. Also, the pipe 110 may extend linearly or may extend slightly curved.

[0125] As shown in FIG. 7, the pipe 110 has a plurality of first pipes 111 arranged side by side so as to constitute a part of the pipe 110, and one or more second pipes 112 arranged at one or more boundaries of the plurality of first pipes 111. The second pipe 112 has flexibility and is connected so as to connect the ends of two adjacent first pipes 111, and communicates with the two first pipes 111 to be connected respectively. The second pipe 112 is more flexible than the first pipe 111. The first pipe 111 is configured as a pipe made of, for example, a resin material, a metal material, etc., and the second pipe 112 is configured as a tube made of, for example, rubber, an elastomer, a resin material, etc. Note that the materials of the first pipe 111 and the second pipe 112 are not limited to these.

[0126] In the example of FIG. 7, water is configured to flow between the internal flow path of the shaft portion 120 configured as a pipe in which a flow path is formed inside and the internal flow path of the pipe 110, and a state where water flows from inside the shaft portion 120 into the pipe 110 or a state where water flows from inside the pipe 110 into the shaft portion 120 can occur. As conceptually shown by the dashed two-dot line in FIG. 12, the second pipe 112 is deformable such that the orientation of the first pipe 111 connected to the other side of the second pipe 112 changes with respect to the orientation of the first pipe 111 connected to one side of the second pipe 112. In the example of FIG. 7, in the pipe 110, the proximal first pipe 111 (the first pipe) arranged closest to the shaft portion 120 is integrally formed with the shaft portion 120, and when the shaft portion 120 rotates, this proximal first pipe 111 rotates integrally with the shaft portion 120. The orientation of the proximal first pipe 111 is determined by the orientation corresponding to the rotational position of the shaft portion 120. When the proximal first pipe 111 in the pipe 110 rotates, the remaining first pipes 111 and the remaining second pipes 112 also rotate accordingly.

[0127] In the examples of FIGS. 6 and 7, the pipe 110 is arranged to be placed on the water bottom 190. When the pipe 110 is placed on the water bottom 190, a plurality of locations of the pipe 110 may be supported by the water bottom 190 such that the pipe 110 intermittently contacts the water bottom 190, or the pipe 110 may be supported by the water bottom 190 in a form where the pipe 110 is placed on the water bottom 190 such that a partial region or the entire region of the pipe 110 continuously contacts the water bottom 190.

[0128] As shown in FIGS. 7 and 8, the pipe 110 is configured to be provided with a plurality of holes 116 that function as nozzles for discharging the water in the pipe 110 toward the water bottom 190. Specifically, in each of the plurality of first pipes 111, a plurality of holes 116 are arranged side by side in the direction in which the pipe 110 extends. Further, in each of the plurality of second pipes 112, a plurality of holes 116 are also arranged side by side in the direction in which the pipe 110 extends. As shown in FIG. 8, the plurality of holes 116 are arranged downward. Specifically, when the posture of the water discharge part 102 is a posture (rising posture) arranged along the vertical direction such that the shaft part 120 rises upward from near the water bottom 190, a plurality of holes 116 are arranged in the lower part of the pipe 110 (specifically, for example, the lower end part of the pipe 110). The above rising posture of the water discharge part 102 is a posture in which the angle formed by the shaft part 120 and the vertical direction is 0° or more and 20° or less. In such a rising posture, the plurality of holes 116 are located below the pipe 110 (below the central axis of the pipe 110) and are arranged to penetrate the cylindrically configured pipe 110 in the radial direction. And in the rising posture, the plurality of holes 116 are arranged facing downward or obliquely downward, and the plurality of holes 116 are arranged facing the water bottom 190. For example, when the angle formed by the extending direction of the shaft part 120 and the vertical direction is 0°, as shown in FIG. 8, the plurality of holes 116 are arranged in a downward direction located in the lower part of the pipe 110 (more specifically, the lower end part or the vicinity of the lower end part of the pipe 110). In this downward arrangement, each of the holes 116 is arranged to penetrate from the inner wall surface to the outer wall surface downward in the lower end part or the vicinity of the lower end part of the pipe 110.

[0129] As shown in FIG. 8, when a plurality of holes 116 are arranged downward, each hole 116 is configured as a through hole extending downward from the inner wall surface of the pipe 110 such that the end on the outer wall surface side of the pipe 110 is positioned lower than the end on the inner wall surface side of the pipe 110, and the lower end of each hole 116 is arranged to face the water bottom 190. Therefore, when water is discharged from the pipe 110 through each hole 116 in such a downward arrangement, water is discharged downward from each hole 116 toward the water bottom 190 in a state where the lower end of each hole 116 faces the water bottom 190. Further, when water is sucked into the pipe 110 through the plurality of holes 116 in such a downward arrangement, water near the water bottom 190 is sucked into the pipe 110 through the plurality of holes 116 in a state where the lower end of each hole 116 faces the water bottom 190.

[0130] For example, when the switching portion 104 is in the first state as shown in FIG. 9 and the pump 132 is driven in the above-described downward arrangement, the pump 132 causes water to flow from the flow path 108D to the flow path 108E. In the first state, since the valves 104A and 104D are in the closed state, the passage of water is blocked at the positions of the valves 104A and 104D. If the driving of the pump 132 continues in this state, the water in the housing portion 180 passes through the water intake path portion 162, the valve 104B, and the flow path 108D in this order and is sent into the pump 132. Then, the water sent from the pump 132 into the flow path 108E passes through the valve 104C, the flow path 108G, the guiding path 166, and the shaft portion 120 in this order and is sent into the pipe 110, and the water sent into the pipe 110 is discharged from the plurality of holes 116 arranged to face the water bottom 190 toward the water bottom 190. In this case, the plurality of holes 116 function as nozzles for discharging water downward.

[0131] When the switching unit 104 is in the second state as shown in FIG. 10 in the above downward arrangement and the pump 132 is driven, the pump 132 causes water to flow from the flow path 108D to the flow path 108E. In the second state, since the valves 104B and 104C are in the closed state, the passage of water is blocked at the positions of the valves 104B and 104C. If the driving of the pump 132 continues in this state, the water near the bottom 190 in the housing portion 180 is sucked through the plurality of holes 116. The water sucked through the plurality of holes 116 in this way is sent to the pump 132 in the order of the pipe 110, the shaft portion 120, the guide path 166, the flow path 108G, the valve 104A, and the flow path 108D. Then, the water sent from the pump 132 to the flow path 108E is discharged into the housing portion 180 in the order of the valve 104D, the water discharge path portion 164, and the filter portion 138.

[0132] When the valves 104A, 104B, 104C, and 104D are configured as electromagnetic valves, the control of the valves 104A, 104B, 104C, and 104D and the control of the pump 132 may be performed by a control device (not shown). For example, when a predetermined water discharge start condition is satisfied, the control device may control to close the valves 104A and 104D, open the valves 104B and 104C, and drive the pump 132, so as to operate as shown in FIG. 9. Then, when a predetermined suction start condition is satisfied, the control device may control to open the valves 104A and 104D, close the valves 104B and 104C, and drive the pump 132, so as to operate as shown in FIG. 10.

[0133] Note that the present invention is not limited to such an example. When discharging water from the pipe 110, the energization of the pump 132 and the switching of the valves 104A, 104B, 104C, and 104D may be manually performed by an operator to achieve the state as shown in FIG. 9. When sucking water from the pipe 110, the energization of the pump 132 and the switching of the valves 104A, 104B, 104C, and 104D may be manually performed by an operator to achieve the state as shown in FIG. 10.

[0134] As shown in FIG. 6, the shaft portion 120 is connected to the pipe 110 and is arranged to extend upward from the pipe 110. In the present embodiment, the shaft portion 120 and the pipe 110 are integrally rotatable about the rotation axis X along the shaft portion 120. While the shaft portion 120 maintains a rising state extending upward from near the bottom 190, when the shaft portion 120 and the pipe 110 rotate about the rotation axis X and the pipe 110 rotates around the shaft portion 120, for example, as shown by the solid line in FIG. 11, the pipe 110 is displaced along the bottom 190 like the two-dot chain line portion 110A or the two-dot chain line portion 110B. Therefore, the positions where the water is discharged from the plurality of holes 116 toward the bottom 190 can be changed variously. Note that the operation of rotating the shaft portion 120 and the pipe 110 in this way may be performed simultaneously in parallel with the water discharge operation (the operation of driving the pump 132 while maintaining the switching unit 104 in the first state) as shown in FIG. 9, or may be performed simultaneously in parallel with the suction operation (the operation of driving the pump 132 while maintaining the switching unit 104 in the second state) as shown in FIG. 10.

[0135] In the example of FIG. 11, a pair of gripping portions 124 configured as handles are provided at a portion near the upper end of the shaft portion 120. The gripping portions 124 are integrally provided with the shaft portion 120 so as to extend from the outer peripheral surface of the shaft portion 120 in a direction different from that of the shaft portion 120 (for example, a direction orthogonal to the shaft portion 120). When the user grips the gripping portions 124 and rotates the gripping portions 124, the gripping portions 124 and the shaft portion 120 rotate integrally. In FIGS. 1, 6, etc., the gripping portions 124 are shown omitted.

[0136] FIG. 11 shows an example in which the gripping portions 124 are provided, and an example of rotating the shaft portion 120 manually by an operator's hand is described, but it is not limited to such an example. For example, the shaft portion 120 may be rotated by a driving force from a driving means such as an electric motor.

[0137] Note that in FIGS. 6 and 11, a holding portion 150 is provided for rotatably holding the shaft portion 120 at a position near the peripheral wall 182. The holding portion 150 may be configured as a bearing, may be configured as a through-hole portion fixed to the peripheral wall 182, or may be configured by other holding structures, as long as it is configured to rotatably hold the shaft portion 120 at a position near the peripheral wall 182. For example, in the example of FIG. 6, a plurality of holding portions 150 configured as through-hole portions or the like are provided vertically in a form fixed to the peripheral wall 182, and these holding portions 150 rotatably hold the shaft portion 120 at a position near the peripheral wall 182. Note that if the shaft portion 120 is configured to be self-supporting, such a holding portion 150 may not be provided.

[0138] Note that, as shown in FIGS. 12 and 13, the shaft portion 120 may be configured to be movable along the peripheral wall 182. There are various structures for making the shaft portion 120 movable along the peripheral wall 182. For example, a rail or the like that defines the movement path of the shaft portion 120 may be provided near the peripheral wall 182 or outside the housing portion 180, and the shaft portion 120 may be movable along the peripheral wall 182 guided by this rail. The power for moving the shaft portion 120 along the peripheral wall 182 may be due to the manual work of an operator or may be using a power source such as a motor.

[0139] 6. Examples of effects The cleaning device 100 shown in FIG. 1 can remove the sediment near the bottom 190 by discharging water from a plurality of holes 116 (FIG. 7) provided in the pipe 110 near the bottom 190 toward the bottom 190. And since the cleaning device 100 can move the pipe 110 having such a function along the bottom 190 as shown in FIG. 11, it is possible to remove the sediment deposited on the bottom 190 from the bottom 190 in a wider range. Moreover, since the cleaning device 100 is configured to move the pipe 110 along the bottom 190 by rotating the shaft portion 120 extending upward from the pipe 110 about the rotation axis X along the shaft portion 120, when the pipe 110 moves, it is possible to suppress stirring the region above the vicinity of the bottom in the housing portion 180 (the region separated upward from the bottom 190 in the height direction). Therefore, the cleaning device 100 can effectively and widely remove the sediment deposited on the bottom 190 from the bottom 190 while suppressing strong stirring of the region above the vicinity of the bottom 190.

[0140] When the switching unit 104 is in the first state, the cleaning device 100 can perform cleaning to remove the sediment on the bottom 190 from the bottom 190 by discharging water from the holes 116 toward the bottom 190. Moreover, by using in combination the operation of discharging water toward the bottom 190 and the operation of rotating the shaft portion 120 and the pipe 110 about the rotation axis X, the cleaning device 100 can perform cleaning to remove the sediment deposited on the bottom 190 from the bottom 190 over a wide range while suppressing strong stirring of the above-mentioned region (the region above the vicinity of the bottom 190). On the other hand, when the switching unit 104 is in the second state, the cleaning device 100 can suck the water in the housing portion 180 through the plurality of holes 116 by the operation of the water flow adjustment unit 130 (suction unit), so that the peeled sediment can be recovered and treated together with the water.

[0141] The cleaning device 100 can perform cleaning to collect and process the peeled deposits together with water over a wide range while suppressing the strong agitation of the above-described region (the region above the vicinity of the bottom 190) by combining the operation of sucking water through a plurality of holes 116 and the operation of rotating the shaft portion 120 and the pipe 110 about the rotation axis X. Moreover, the cleaning device 100 can realize such characteristic cleaning while simplifying the device configuration in water by combining the common pipe 110 and the switching portion 104.

[0142] When the shaft portion 120 is rotatably held at a position closer to the peripheral wall 182 in the cleaning device 100, it is possible to effectively suppress the strong agitation of the region on the central side of the housing portion 180 when moving the plurality of holes 116 along the bottom 190.

[0143] Due to the presence of the second pipe 112, the cleaning device 100 can change the direction of the first pipe 111 on the other side with respect to the direction of the first pipe 111 on one side, so that the entire pipe 110 is easily bent as shown in FIG. 11, and it is easy to deform the overall shape of the pipe 110 according to the shape of the bottom 190.

[0144] The cleaning device 100 is also provided with holes 116 in the second pipe 112, and by providing the holes 116 in the flexible second pipe 112, the function of peeling deposits can be enhanced.

[0145] As shown in FIG. 12, when the shaft portion 120 is movable along the peripheral wall 182 in the cleaning device 100, the starting point of the rotation of the pipe 110 on the bottom 190 can be changed, and effects such as a wider range that the pipe 110 can reach as shown by the two-dot chain line portions in FIGS. 11 and 13 and the ability to change the moving direction when moving the holes 116 can be expected. If the cleaning device 100 is configured so that the shaft portion 120 can be moved along the peripheral wall 182 while being maintained at a position closer to the peripheral wall 182, a configuration that can expand the range reached by the pipe 110 while suppressing the agitation on the central side can be realized with a highly convenient configuration.

[0146] When the cleaning device 100 sucks the water after the sediment near the bottom 190 has been peeled off by discharging water toward the bottom 190 by the water flow adjustment unit 130 (suction unit), the foreign matters can be removed from the water sucked by the filter unit 138, and then the water can be returned to the storage unit 180.

[0147] The cleaning device 100 has a circulation structure that takes water from within the storage unit 180 and sends the water to the pipe 110 near the bottom 190, and can perform cleaning to discharge water from the plurality of holes 116 toward the bottom 190.

[0148] <Second Embodiment> 7. Basic Configuration FIG. 14 shows an example of the cleaning device of the second embodiment. The cleaning device according to the second embodiment and the cleaning target to which the cleaning method realized by this cleaning device is applied are the same as the aquaculture system Sy described in "2. An Example of the Cleaning Target: Aquaculture System Sy" in the description of the above-described first embodiment. Further, the storage unit that is the cleaning target of the cleaning device according to the second embodiment and the cleaning method realized by this cleaning device is the same as the storage unit 180 described in "3. Details of the Storage Unit 180" in the description of the first embodiment. Furthermore, the cleaning device of the second embodiment has all the configurations and functions described in "4. Basic Configuration of the Cleaning Device" and "5. Detailed Configuration of the Water Discharge Unit 102" in the description of the first embodiment, and also has all the other functions of the first embodiment. Therefore, the effects as described in "6. Examples of Effects" above can be produced. And, a further configuration described below is added to the cleaning device 100 of the second embodiment. Below, the added configuration will be mainly described.

[0149] Similar to the cleaning device 100 of the first embodiment, the cleaning device 100 of the second embodiment also includes a pipe 110 installed along the upper surface (water bottom surface) of the bottom 190 of the water storage part 180 that stores water, and a supply part (water flow adjustment part 130) that communicates with the pipe 110 and is capable of performing a supply operation to supply water to the pipe 110. And, similar to the first embodiment, the pipe 110 is provided with a plurality of hole parts 116 (FIGS. 7 and 8) that function as nozzles for discharging the water in the pipe 110 toward the bottom 190, and the plurality of hole parts 116 also have a function of moving along the bottom 190. Also in this embodiment, in response to an operation of the user rotating the grip part 124 about the shaft part 120 while gripping the grip part 124 (FIG. 11), the grip part 124 and the shaft part 120 may rotate integrally about the shaft part 120, or the shaft part 120 may be driven by a driving force from a driving means such as an electric motor and the shaft part 120 may rotate about its central axis.

[0150] On the other hand, the cleaning device 100 in FIG. 14, in addition to the configuration in FIG. 1, has a water intake part 162C provided near the tip of the water intake pipe 162A. That is, in the cleaning device 100 in FIG. 14, the water intake path part 162 is configured to include the water intake part 162C in addition to the water intake pipe 162A and the intermediate pipe 162B.

[0151] The water intake part 162C has a box-like form with a peripheral wall part and a bottom part and an opening at the upper end. The water intake part 162C is fixed at a predetermined position within the accommodating part 180 and is positioned at a predetermined height within the accommodating part 180. The part of the peripheral wall part and the bottom part that constitutes the outer periphery in the water intake part 162C partitions the water region within the accommodating part 180 and the region within the water intake part 162C. The opening at the upper end in the water intake part 162C functions as the water intake port 163. The water intake port 163 is a part for taking in the water within the accommodating part 180 and is arranged above the pipe 110 within the accommodating part 180. In the example of FIG. 14, the water intake port 163 is arranged near the water surface of the water Wa stored within the accommodating part 180. The water intake port 163 is arranged in a configuration fixed at a predetermined height within the accommodating part 180 and functions to take in the overflow water exceeding the predetermined height within the accommodating part 180. In the example of FIG. 14, when the height of the water surface of the water Wa stored within the accommodating part 180 is lower than the height of the water intake port 163 (specifically, the height of the part arranged at the lowest position in the water intake port 163), the water Wa stored within the accommodating part 180 is not introduced into the water intake part 162C, and when the height of the water surface of the water Wa stored within the accommodating part 180 is higher than the height of the water intake port 163, the water at a position higher than the water intake port 163 among the water Wa flows in so as to fall from the water intake port 163 into the water intake part 162C.

[0152] In the example of FIG. 14, the water intake path part 162 constituted by the water intake part 162C, the water intake pipe 162A, and the intermediate pipe 162B corresponds to an example of a water intake path and functions to introduce the water within the accommodating part 180. The water intake path part 162 corresponds to an example of a water intake flow path and functions to guide the water that has entered the water intake port 163 toward the water flow adjustment part 130. On the other hand, the water discharge part 102 and the pipe 110 correspond to an example of a separate flow path different from the water intake flow path. The water discharge path part 164 corresponds to an example of a separate flow path different from the water intake path part 162 (water intake flow path) and also corresponds to an example of a third flow path different from the water intake path part 162 (water intake flow path) and the pipe 110.

[0153] The water flow adjustment unit 130 corresponds to an example of a guiding unit, and is a part capable of guiding the water led by the water intake path unit 162 (water intake flow path) to a different flow path (the water discharge unit 102, the pipe 110, or the water discharge path unit 164) different from the water intake path unit 162 (water intake flow path). Further, the water flow adjustment unit 130 corresponds to an example of a flowing unit, has a function of generating the first flowing state and the second flowing state described later, and also has a function of generating the first circulation state, the second circulation state, and the third circulation state described later.

[0154] 8. Operation Also in the cleaning device 100 of the second embodiment, the pipe 110 is arranged along the bottom 190 of the housing part 180 that stores water, and the plurality of hole parts 160 (FIGS. 7 and 8) face the bottom 190 side, and the water flow adjustment part 130 (supply part) is provided so as to communicate with the pipe 110. On the other hand, the water intake port 163 is arranged above the pipe 110 in the housing part 180, and the water flow adjustment part 130 (guiding part) is arranged so as to guide the water led by the water intake path part 162 (water intake flow path) to a different flow path (the water discharge path part 164, the water discharge part 102, etc.) different from the water intake path part 162 (water intake flow path). Then, the cleaning device 100 performs the operation of displacing the plurality of hole parts 160 along the bottom 190 and the operation of guiding the water led by the water intake path part 162 (water intake flow path) to the above-mentioned different flow path either simultaneously or at different times. As an example of performing them simultaneously, there is an example in which the shaft part 120 is rotated by an operation by a person or driving by a driving means in the first circulation state described later, and is moved along the bottom 190 as shown in FIG. 11. As an example of performing them at different times, in the third circulation state as shown in FIG. 17, while supplying water to the water discharge part 102 by some means, the shaft part 120 is rotated by an operation by a person or driving by a driving means, and is moved along the bottom 190 as shown in FIG. 11. Some means in this case may be means for providing another water intake path part having the same configuration as the water intake path part 162 and guiding water from this water intake path part to the water discharge part 102, or may be means for guiding water from a water source different from the housing part 180 to the water discharge part 102.

[0155] The water flow adjustment unit 130 can be switched to the first circulation state as shown in Fig. 15. When the water flow adjustment unit 130 is in the first circulation state, it performs the same operation as the operation shown in Fig. 9 above, so that the water that has entered the water intake 163 can be made to flow and returned into the storage unit 180 through the pipe 110 and the plurality of holes 116. Note that the first circulation state corresponds to an example of the first flow state, and is a flow state in which the water that has entered the water intake 163 is made to flow and returned into the storage unit 180 from a path different from the water intake 163. In this case, the switching unit 104 is in the first state of the first embodiment, and the valves 104A and 104D are in the closed state, and these block the flow of the flow path in which they are provided. When the switching unit 104 is in the first state, the valves 104B and 104C are in the open state, and these allow the flow of the flow path in which they are provided. When the pump 132 flows when the switching unit 104 is in the first state as shown in Fig. 15, the water in the storage unit 180 is sucked into the pump 132 through the water intake path unit 162, the valve 104B, and the flow path 108D, and the sucked water is supplied to the water discharge unit 102 through the flow paths 108E, 108F, the valve 104C, and the guide path 166 by the driving of the pump 132. Therefore, when water is supplied into the water discharge unit 102 by the water flow adjustment unit 130 in this way, the water supplied into the water discharge unit 102 flows into the pipe 110 through the shaft portion 120, and the water that has flowed into the pipe 110 from the shaft portion 120 is discharged from the plurality of holes 116 (Figs. 7 and 8) toward the bottom 190.

[0156] The water flow adjustment unit 130 can be switched to the second circulation state as shown in FIG. 16. When the water flow adjustment unit 130 is in the second circulation state, it performs the same operation as the operation shown in FIG. 10 described above, so that the water in the housing portion 180 can be sucked into the pipe 110 from the plurality of hole portions 116 and returned to the housing portion 180 through the water discharge path portion 164 (third flow path). The second circulation state corresponds to an example of the second flow state, and is a flow state in which the water in the housing portion 180 is sucked into the pipe 110 from the plurality of hole portions 116 and returned to the housing portion 180 through a path different from the plurality of hole portions 116. In this case, the switching unit 104 is in the second state, and the valves 104A and 104D are in the open state, and these allow the flow of the flow path in which they are provided. When the switching unit 104 is in the second state, the valves 104B and 104C are in the closed state, and these block the flow of the flow path in which they are provided. When the pump 132 flows when the switching unit 104 is in the second state as shown in FIG. 16, the water in the housing portion 180 is sucked into the pump 132 through the water discharge portion 102, the guide path 166, the flow path 108G, the valve 104A, and the flow path 108D, and the sucked water is discharged into the housing portion 180 through the flow path 108E, the valve 104D, the water discharge path portion 164, and the filter portion 138 by the drive of the pump 132.

[0157] The water flow adjustment unit 130 can be switched to the third circulation state as shown in FIG. 17. When the water flow adjustment unit 130 is in the third circulation state, the water that has entered the water intake 163 can be made to flow and returned into the storage unit 180 via the water discharge path section 164 (third flow path). Note that the third circulation state corresponds to an example of the first flow state, and is a flow state in which the water that has entered the water intake 163 is made to flow and returned into the storage unit 180 from a path different from the water intake 163. In this case, the valves 104B and 104D are in the open state, and these allow the flow of the flow paths in which they are provided. Then, the valves 104A and 104C are in the closed state, and these block the flow of the flow paths in which they are provided. In the state as shown in FIG. 17, when the pump 132 flows, the water in the storage unit 180 is sucked into the pump 132 through the water intake path section 162, the valve 104B, and the flow path 108D, and the sucked water is discharged into the storage unit 180 through the flow path 108E, the valve 104D, the water discharge path section 164, and the filter section 138 by the drive of the pump 132.

[0158] In the present embodiment, the filter section 138 corresponds to an example of a removal section. In the examples of FIGS. 14, 16, 17, etc., the filter section 138 functions to remove foreign matter from the water that has flowed through the water discharge path section 164 (third flow path) (specifically, the water before being discharged from the outlet of the water discharge path section 164 (third flow path) and entering the storage unit 180). The foreign matter is, for example, a solid such as a solid object or a liquid having a different component from water, and may be a solid such as uneaten feed, feces, scales, protein foam, dust, sebum, hair, plant leaves, bird feathers, etc., or may be oil or other liquids (liquids having a different component from water and removable by a known filter, etc.).

[0159] For example, in the second circulating state as shown in FIG. 16, water near the bottom 190 is sucked from the plurality of holes 116 and removed by the filter unit 138. Foreign matters that tend to sink near the bottom 190 include uneaten feed, feces, scales, etc., and these foreign matters can be well removed by the filter unit 138. Also, in the third circulating state as shown in FIG. 17, water near the water surface of the water Wa stored in the storage unit 180 is sucked, and solids, oil, etc. floating or mixed in this water are removed by the filter unit 138. As foreign matters near the water surface, such as floating foreign matters, oil components lighter than water, protein foam, dust, sebum, hair, and in the outdoors, leaves of plants, feathers of birds, etc. are assumed, and these foreign matters can be well removed by the filter unit 138.

[0160] The filter unit 138 may be configured to have a filter layer in which a urethane foam with continuous bubbles, a non-woven filter sheet, a mesh sheet, etc. are arranged, and the water flowing through the water discharge path portion 164 is passed through the filter layer to remove foreign matters, or a cartridge filter may be used. For example, when the above filter layer is provided in the filter unit 138, by configuring the filter layer so that a filter with coarser pores is arranged on the upstream side of the flow than on the downstream side, it is possible to prevent clogging and effectively remove foreign matters (such as dust). For example, in the filter unit 138, a filter layer with coarse pores may be arranged on the most upstream side, a filter layer with medium pores may be arranged downstream thereof, and a filter layer with fine pores may be arranged further downstream, and the water entering the filter unit 138 may be passed through these filter layers. For example, when using a malt filter, an example is to use a filter layer with 8 cells / 25 mm as the above coarse pores, a filter layer with 13 cells / 25 mm as the above medium pores, and a filter layer with 25 cells / 25 mm as the above fine pores.

[0161] In addition, when providing a filter layer in the filter section 138, an oil adsorbent may be used as the filter layer. As the oil adsorbent, WOSEP (registered trademark) manufactured by Toray Fine Chemical Co., Ltd. etc. can be preferably used, and other oil adsorbents may also be used.

[0162] Also in this embodiment, the valves 104A, 104B, 104C, and 104D are configured as electromagnetic valves, and the control of the valves 104A, 104B, 104C, and 104D and the control of the pump 132 may be performed by a control device (not shown). For example, when the first time condition is satisfied (for example, when it reaches the first time) or when other first conditions are satisfied, the control device controls the valves 104A, 104B, 104C, and 104D to drive the pump 132 while setting the water flow adjustment unit 130 to the first circulation state to circulate the water in the storage unit 180. When the second time condition (for example, when it reaches the second time) or other second conditions are satisfied, the control device controls the valves 104A, 104B, 104C, and 104D to drive the pump 132 while setting the water flow adjustment unit 130 to the second circulation state to circulate the water in the storage unit 180. When the third time condition (for example, when it reaches the third time) or other third conditions are satisfied, the control device controls the valves 104A, 104B, 104C, and 104D to drive the pump 132 while setting the water flow adjustment unit 130 to the third circulation state to circulate the water in the storage unit 180. Note that the valves 104A, 104B, 104C, and 104D may be manually switchable valves. When the valves 104A, 104B, 104C, and 104D are manually switchable valves, for example, an operator can perform a switching operation of the valves 104A, 104B, 104C, and 104D so as to be in the first circulation state. By driving the pump 132 in this state, the water in the storage unit 180 can be circulated as shown in FIG. 15. Alternatively, the operator can perform a switching operation of the valves 104A, 104B, 104C, and 104D so as to be in the second circulation state. By driving the pump 132 in this state, the water in the storage unit 180 can be circulated as shown in FIG. 16. Alternatively, the operator can perform a switching operation of the valves 104A, 104B, 104C, and 104D so as to be in the third circulation state. By driving the pump 132 in this state, the water in the storage unit 180 can be circulated as shown in FIG. 17. In any of the first circulation state, the second circulation state, and the third circulation state, while the water in the storage unit 180 is circulating, the shaft portion 120 can be rotated by a human operation or driving by a driving means, and the pipe 110 can be moved along the bottom 190 of the water as shown in FIG. 11.

[0163] In the example of FIG. 14 and the like, the filter unit 138 functions to remove foreign matters from the water after it is discharged from the outlet of the water discharge path unit 164 (the third flow path) and passes through the above-described filter layer in the filter unit 138. However, the above-described filter layer of the filter unit 138 may be disposed in the water discharge path unit 164 (the third flow path), and may be configured to remove foreign matters from the water in the water discharge path unit 164 by passing through the above-described filter layer during the process of flowing through the water discharge path unit 164. Alternatively, the filter unit 138 may be disposed at a site different from the water discharge path unit 164 (the third flow path) (for example, the site immediately before entering the valve 104D or the site 108D immediately before entering the pump 132), and may be configured to remove foreign matters from the water before entering the water discharge path unit 164 (the third flow path).

[0164] 9. Another example of the switching unit The configuration as shown in FIG. 14 may be replaced with the configuration as shown in FIG. 18. The configuration of FIG. 18 is only different in the configuration of the switching unit 104 as compared with the configuration of FIG. 14, and the other configurations and functions all have the configurations and functions of the second embodiment described above. In the example of FIG. 18, the valves 104B, 104C, and 104D are configured as three-way valves. Also in this example, a first circulation state in which the water that has entered the water intake 163 is caused to flow and return into the storage unit 180 through the pipe 110 and the plurality of hole portions 116, a second circulation state in which the water in the storage unit 180 is sucked into the pipe 110 from the plurality of hole portions 116 and returned into the storage unit 180 through the water discharge path unit 164 (the third flow path), and a third circulation state in which the water that has entered the water intake 163 is caused to flow and return into the storage unit 180 from the water discharge path unit 164 (the third flow path) can be switched. Further, the configurations of FIGS. 14 and 18 are merely examples, and any other configuration may be used as long as it is a switching unit capable of generating the first to third circulation states.

[0165] 10. Example of effects The cleaning device 100 of the second embodiment shown in FIG. 14 etc. can peel off the sediment deposited on the bottom of the water while suppressing the strong agitation of the area above the vicinity of the bottom of the water, and further, in addition to this function, it also has the function of taking in the water in the storage part 180 from the water intake 163 arranged above the pipe 110 and removing foreign matters, so it can correspond to both the area near the bottom of the water and the area above the pipe 110.

[0166] Since the cleaning device 100 can take in the overflow water exceeding a predetermined height in the storage part 180, it can effectively remove the foreign matters floating near the surface of the water stored in the storage part 180 or the foreign matters gathered near the surface.

[0167] In addition to the function of peeling off the sediment deposited on the bottom of the water, the cleaning device 100 can also realize the function of switching between a characteristic circulation in which the water in the storage part 180 is allowed to flow into the water intake 163 located relatively on the upper side and a characteristic circulation in which the water is sucked into the pipe 110 from a plurality of hole parts 106 located relatively on the lower side and made to flow.

[0168] When the cleaning device 100 performs a characteristic circulation in which the water in the storage part 180 is allowed to flow into the water intake 163 located relatively on the upper side, the water returned to the storage part 180 can be used to peel off the sediment deposited on the bottom of the water.

[0169] The cleaning device 100 can realize a configuration that is easy to remove both the relatively upper foreign matters and the relatively lower foreign matters. Moreover, by switching between the first circulation state, the second circulation state, and the third circulation state, the function of peeling off the foreign matters deposited on the bottom of the water, the function of sucking in the foreign matters existing near the bottom of the water and returning the water to the storage part 180, and the function of sucking in the foreign matters existing relatively on the upper side and returning the water to the storage part 180 can be switched.

[0170] Even when the cleaning device 100 sucks to create a second circulation state to take in foreign matters existing near the bottom of the water, or sucks to create a third circulation state to take in foreign matters existing relatively on the upper side, the removal unit (filter unit 138) can actively and efficiently remove the foreign matters.

[0171] At the stage of the breeding tank 3, the cleaning device 100 can effectively remove not only foreign matters (such as feed and feces) near the bottom of the water but also foreign matters (such as oil, protein foam, and sebum) existing near the water surface. Therefore, when removing foreign matters in the subsequent foam separator 7, the removal effect of the foam separator 7 can be enhanced. For example, among the foreign matters existing near the water surface, it is possible to less likely cause a situation where sufficient foam separation cannot be performed due to a large amount of oil in particular.

[0172] <Other Embodiments> The present invention is not limited to the embodiments described by the above description and drawings. For example, the features of the above-described or below-described embodiments can be combined in any combination within a non-contradictory range. Also, any feature of the above-described or below-described embodiments can be omitted if it is not explicitly specified as essential. Furthermore, the above-described embodiments may be modified as follows.

[0173] In the above-described embodiment, the housing part 180 is used for aquaculture, but it may be used for applications other than aquaculture. Alternatively, the housing part 180 may be used in an aquaculture system other than the aquaculture system as shown in FIG. 2.

[0174] In the above-described embodiment, the water stored in the housing part 180 contains salt water, but it may be water that does not contain salt.

[0175] In the above-described embodiment, the upper end of the housing part 180 to be cleaned is open as shown in FIG. 1, but the upper end side of the housing part 180 may be closed.

[0176] In the above-described embodiment, the upper surface of the bottom 190 of the accommodating portion 180 is a flat horizontal plane. However, the upper surface of the bottom 190 may be provided with a step or the like in part. The upper surface of the bottom 190 may be slightly inclined with respect to the horizontal plane.

[0177] In the above-described embodiment, the peripheral wall 182 of the accommodating portion 180 is configured as a cylindrical wall portion. However, the present invention is not limited to this example, and a configuration in which a plurality of walls having flat inner wall surfaces are arranged annularly may be used, or other configurations may be used. Further, the inner wall surface of the peripheral wall is not limited to a configuration along the vertical direction, and part or all of it may be inclined with respect to the vertical direction, or may have a step or the like.

[0178] In the above-described embodiment, as shown in FIG. 1, the periphery of the region that stores water in the accommodating portion 180 to be cleaned is entirely surrounded. However, a part of the periphery of the region that stores water may be open, and a configuration that allows water to flow into or out of the region may be used.

[0179] In the above-described embodiment, the pipe 110 is formed with a configuration including the first pipe 111 and the second pipe 112. However, a pipe constituted only by the first pipe 111 may be replaced with the above-described pipe 110.

[0180] In the above-described first embodiment, the shaft portion 120 is configured as a pipe, and water flows between the water flow adjustment portion 130 and the pipe 110 via the shaft portion 120. However, the present invention is not limited to this example. For example, a pipe different from the shaft portion 120 may be interposed between the water flow adjustment portion 130 and the pipe 110, and water may flow between the water flow adjustment portion 130 and the pipe 110 via this different pipe. In this case, the above-described different pipe may be attached to the shaft portion 120, may be integrated with the shaft portion 120, or may be arranged slightly separated from the shaft portion 120.

[0181] In the above-described first embodiment, the pipe 110 is placed on the water bottom 190, but the present invention is not limited to this example. The pipe 110 may be configured to move along the water bottom 190 at a position slightly away from the water bottom 190. Alternatively, the pipe 110 may be configured to move along the water bottom 190 while being separated from or in contact with the water bottom 190.

[0182] In the above-described embodiment, the water flow adjustment unit 130 functions as the supply unit and the suction unit, but the supply unit and the suction unit may be configured by separate means respectively. For example, the supply unit and the suction unit may each have a separate pump.

[0183] In the above-described embodiment, the water flow adjustment unit 130, which is an example of the supply unit, is configured to suck the water in the storage unit 180 through the water intake path unit 162 and circulate it to discharge the water from the hole unit 116 through the water discharge unit 102, but the present invention is not limited to this example. The supply unit may operate to discharge the water supplied from a location different from the storage unit 180 from the hole unit 116 through the water discharge unit 102.

[0184] In the above-described embodiment, the water flow adjustment unit 130, which is an example of the suction unit, is configured to suck the water in the storage unit 180 through the hole unit 116 and the water discharge unit 102 and circulate it to discharge the water into the storage unit 180 through the water discharge path unit 164, but the present invention is not limited to this example. The suction unit may operate to discharge the water in the storage unit 180 through the hole unit 116 and the water discharge unit 102 and then discharge the water to a location different from the storage unit 180.

[0185] It should be noted that the embodiments disclosed in this specification should be considered as illustrative in all respects and not restrictive. The scope of the present invention is not limited to the embodiments disclosed in this specification, but is intended to include all modifications within the scope indicated by the claims or within the scope equivalent to the claims.

Explanation of Reference Numerals

[0186] 1: Circulating water treatment system 100: Cleaning device 102: Drainage section 104: Switching section 102: Drainage section (separate flow path) 110: Pipe 111: First pipe 112: Second pipe 116: Hole section 120: Shaft section 130: Water flow adjustment section (supply section, suction section, guiding section, flowing section) 132: Pump 162: Water intake path section (separate flow path, third flow path) 163: Water intake port 180: Housing section 182: Peripheral wall 190: Bottom of the water W: Water X: Rotation axis

Claims

1. A pipe installed along the bottom of a water-containing portion for containing water, a supply unit communicating with the pipe and capable of performing a supply operation for supplying water to the pipe, a shaft portion connected to the pipe and extending upward from the pipe, and having a plurality of hole portions provided in the pipe and functioning as nozzles for discharging the water in the pipe toward the bottom of the water; the shaft portion and the pipe are rotatable about a rotation axis along the shaft portion, and by rotating the shaft portion and the pipe about the rotation axis, the plurality of hole portions move along the bottom of the water Cleaning device.

2. A pipe installed along the bottom of a water-containing portion for containing water, a supply unit communicating with the pipe and capable of performing a supply operation for supplying water to the pipe, a suction unit communicating with the pipe and capable of performing a suction operation for sucking water from the pipe, a switching unit that switches between a first state in which the suction operation by the suction unit is stopped while allowing the supply operation by the supply unit and a second state in which the supply operation by the supply unit is stopped while allowing the suction operation by the suction unit, and having a plurality of hole portions provided in the pipe and functioning as nozzles for discharging the water in the pipe toward the bottom of the water; when the switching unit is in the first state, the water supplied to the pipe by the supply unit is discharged from the plurality of hole portions toward the bottom of the water, and when the switching unit is in the second state, the water in the containing portion is sucked into the pipe through the plurality of hole portions Cleaning device.

3. a suction unit communicating with the pipe and capable of performing a suction operation for sucking water from the pipe, a switching unit that switches between a first state in which the suction operation by the suction unit is stopped while allowing the supply operation by the supply unit and a second state in which the supply operation by the supply unit is stopped while allowing the suction operation by the suction unit, and having when the switching unit is in the first state, the water supplied to the pipe by the supply unit is discharged from the plurality of hole portions toward the bottom of the water, and when the switching unit is in the second state, the water in the containing portion is sucked into the pipe through the plurality of hole portions The cleaning device according to claim 1.

4. The containing portion has a peripheral wall disposed around a region for containing water and constituting an inner wall portion of the region, and a bottom wall provided on a lower end side of the peripheral wall, and has a holding portion that rotatably holds the shaft portion at a position closer to the peripheral wall The cleaning device according to any one of claims 1 or 3.

5. The tube has a plurality of first tubes arranged side by side so as to constitute a part of the tube, and one or more second tubes arranged at one or more boundaries of the plurality of first tubes. The second tube has flexibility and is connected so as to connect the ends of two adjacent first tubes, and communicates with the two first tubes to be connected respectively. At least the first tube is provided with the hole portion. The second tube is deformable such that the orientation of the first tube connected to the other side of the second tube changes with respect to the orientation of the first tube connected to one side of the second tube. The cleaning device according to any one of claims 1 or 3.

6. The second tube is also provided with the hole portion. The cleaning device according to claim 5.

7. The housing portion has a peripheral wall disposed around a region for housing water and constituting an inner wall portion of the region, and a bottom wall provided on the lower end side of the peripheral wall. The shaft portion is configured to be movable along the peripheral wall. The cleaning device according to any one of claims 1 or 3.

8. It has a holding portion that holds the shaft portion movably along the peripheral wall at a position near the peripheral wall. The cleaning device according to claim 7.

9. A discharge path that is a path for discharging water into the housing portion and is configured as a path different from the tube, A filter portion that removes foreign matters from the water sucked from the tube in the water passage on the downstream side of the discharge path. Comprising The suction portion has a pump, and while sucking the water in the housing portion through the plurality of hole portions and the tube by driving the pump, it sends it out toward the discharge path. The cleaning device according to claim 2 or 3.

10. It is provided with a water intake path for introducing water into the housing portion. The supply portion has a pump, and while sucking the water in the housing portion through the water intake path by driving the pump, it sends it out to the tube. The cleaning device according to claim 2 or 3.

11. A water intake port that is a part for taking in water in the housing portion and is disposed above the tube in the housing portion, A water intake flow path that guides the water that has entered the water intake port, A guiding portion that can guide the water guided by the water intake flow path to a different flow path from the water intake flow path. Comprising The cleaning device according to any one of claims 1 to 3.

12. A tube installed along the bottom of a housing portion for housing water, A supply portion that communicates with the tube and is capable of performing a supply operation of supplying water to the tube. A water intake part for taking in water in the storage part, the water intake being arranged above the pipe in the storage part, and a water intake channel for guiding the water that has entered the water intake, a guiding part capable of guiding the water guided by the water intake channel to a different flow path from the water intake channel, and having a plurality of holes are provided in the pipe that function as nozzles for discharging the water in the pipe toward the bottom of the water; a plurality of the holes move along the bottom of the water cleaning device. **Claim 13** The water intake is arranged at a predetermined height in the storage part, and takes in the overflow water exceeding the predetermined height in the storage part The cleaning device according to claim 12. **Claim 14** A flow part for generating at least a first flow state in which the water that has entered the water intake is made to flow and returned to the storage part from a path different from the water intake, and a second flow state in which the water in the storage part is sucked into the pipe from a plurality of the holes and returned to the storage part from a path different from the plurality of the holes is provided The cleaning device according to claim 12 or claim 13. **Claim 15** The first flow state includes a circulating state in which the water that has entered the water intake is made to flow and returned to the storage part from a plurality of the holes The cleaning device according to claim 14. **Claim 16** The different flow path includes a third flow path different from the water intake channel and the pipe, A flow part for switching to a first circulating state in which the water that has entered the water intake is made to flow and returned to the storage part through the pipe and a plurality of the holes, a second circulating state in which the water in the storage part is sucked into the pipe from a plurality of the holes and returned to the storage part through the third flow path, and a third circulating state in which the water that has entered the water intake is made to flow and returned to the storage part through the third flow path is provided The cleaning device according to claim 12 or claim 13. **Claim 17** A removing part for removing foreign matter from the water before entering the third flow path, or the water in the third flow path, or the water that has flowed through the third flow path is provided The cleaning device according to claim 16. **Claim 18** a pipe provided with a plurality of holes, a supply part capable of performing a supply operation for supplying water, a shaft part, and using the supply part is provided so as to communicate with the pipe, the pipe is arranged along the bottom of the storage part for storing water, and a plurality of the holes face the bottom side, the shaft part is connected to the pipe so as to extend upward from the pipe, by supplying water to the pipe by the supply part, the water in the pipe is discharged from a plurality of the holes toward the bottom of the water, By rotating the shaft portion and the pipe about a rotation axis along the shaft portion, a plurality of the hole portions are displaced along the bottom of the water Cleaning method.

19. A pipe provided with a plurality of hole portions, A supply unit capable of performing a supply operation for supplying water, A suction unit capable of performing a suction operation for sucking water, A switching unit that switches between a first state in which the suction operation by the suction unit is stopped while allowing the supply operation by the supply unit, and a second state in which the supply operation by the supply unit is stopped while allowing the suction operation by the suction unit, is used, The supply unit and the suction unit are provided so as to communicate with the pipe, The pipe is arranged along the bottom of the storage unit that stores water, and a plurality of the hole portions face the bottom side, By switching the switching unit to the first state, the water supplied to the pipe by the supply unit is discharged from the plurality of hole portions toward the bottom of the water, By switching the switching unit to the second state, the water in the storage unit is sucked into the pipe from the plurality of hole portions Cleaning method.

20. A pipe provided with a plurality of hole portions, A supply unit capable of performing a supply operation for supplying water, A water intake that is a part for taking in the water in the storage unit, A water intake channel for guiding the water that has entered the water intake, A guiding unit for guiding the water guided by the water intake channel, is used, The pipe is arranged along the bottom of the storage unit that stores water, and a plurality of the hole portions face the bottom side. The supply unit is provided so as to communicate with the pipe. The water intake is arranged above the pipe in the storage unit. The guiding unit is arranged so as to guide the water guided by the water intake channel to a different flow path from the water intake channel. In this state, An operation of displacing a plurality of the hole portions along the bottom of the water and an operation of guiding the water guided by the water intake channel to the different flow path are performed simultaneously or at different times Cleaning method.

Images