Water sampling strainer

Abstract

To provide a water sampling strainer capable of preventing clogging of suction holes for sucking in sewage by residues contained in the sewage.SOLUTION: A water sampling strainer 4 is provided, comprising a main body 41 having suction holes 412 for sucking in sewage on a side face 411, and an extension part 44 attached to the side face 411 to extend toward the outside of the main body 41 from the side face 411 for the purpose of making an apparent peripheral length of the main body 41 greater than a peripheral length of the side face 411.SELECTED DRAWING: Figure 6

Description

[Technical Field]

[0001] The present invention relates to a water collection strainer that is immersed in sewage to suck up the sewage. [Background technology]

[0002] There are devices for collecting samples of sewage, industrial wastewater, etc., in order to inspect general sewage such as domestic wastewater, industrial wastewater, etc. For example, Patent Document 1 discloses a sewage water sampling device that samples sewage flowing through a sewer channel. Also, Patent Document 2 discloses a water sampling device that collects samples of discharged water from a river discharge canal.

[0003] The device described in Patent Document 1 has a strainer attached to the tip of a flexible pipe. The strainer described in Patent Document 1 has a plurality of openings formed at intervals in the circumferential direction. The openings formed in the strainer serve as inlets for sucking in sewage. In the device described in Patent Document 2, a water sampling pipe with its tip facing a river discharge channel is connected to a water sampling pump via a strainer. The strainer described in Patent Document 2 removes garbage, earth, and sand and sends a sample of the discharge water to a sand filtration device.

[0004] Attempts are being made to collect and test sewage samples to detect viruses and microorganisms contained in the sewage and grasp trends in the number of infected people with certain infectious diseases. Sewage contains residue, such as hair and lint. As a result, the residue can become entangled in the water sampling strainer when it draws in sewage. This occurs when the residue wraps around the water sampling strainer, encircling the entire circumference of the strainer and twisting both ends of the residue together. Once entanglement occurs, the residue can grow from the entangled part. If the entanglement grows, the suction hole of the water sampling strainer that draws in the sewage can become clogged, potentially preventing the water sampling strainer from drawing in the sewage. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Laid-Open No. 2006-53124 [Patent Document 2] Japanese Patent Application Laid-Open No. 2001-50927 Summary of the Invention [Problem to be solved by the invention]

[0006] The present invention has been made in consideration of the above circumstances, and aims to provide a water sampling strainer that can prevent the suction hole that sucks in sewage from being blocked by screen residue contained in the sewage. [Means for solving the problem]

[0007] A first aspect of the present invention is a water sampling strainer that is immersed in sewage and sucks up the sewage, characterized in that it comprises a main body having a suction hole on its side for sucking up the sewage, and an extension attached to the side and extending from the side toward the outside of the main body, making the apparent length of the perimeter of the main body longer than the length of the perimeter of the side.

[0008] According to a first aspect of the present invention, the extension is attached to a side surface of the main body where the suction hole for sucking sewage is provided, and extends from the side surface of the main body toward the outside of the main body. The extension also makes the apparent length of the periphery of the main body longer than the periphery of the side surface of the main body. Therefore, the extension can prevent the screened residue from going around the entire circumference of the water sampling strainer and twisting its ends together. This can prevent the screened residue from becoming entangled in the water sampling strainer. This can prevent the suction hole for sucking sewage from being blocked by the screened residue contained in the sewage.

[0009] A second aspect of the present invention is a water sampling strainer according to the first aspect of the present invention, characterized in that the main body is cylindrical, the suction hole is provided on the circumferential surface of the cylinder, and the extension portion is plate-shaped and extends from the circumferential surface radially outward of the main body.

[0010] According to the second aspect of the present invention, a cylindrical main body can be formed by bending, for example, a plate-shaped punched metal having holes. Furthermore, an extension extending from the circumferential surface of the main body toward the outside in the radial direction of the main body can be formed by attaching, for example, a plate-shaped member to the circumferential surface of the main body by welding. This allows the water sampling strainer according to the second aspect of the present invention to have a relatively simple structure and prevent the suction hole from being blocked by sediment.

[0011] A third aspect of the present invention is the water sampling strainer of the second aspect of the present invention, characterized in that the extension portion is provided over the entire length of the main body in the axial direction of the cylinder.

[0012] According to the third aspect of the present invention, the extension is provided over the entire length of the main body in the axial direction of the cylinder. This prevents entanglement of screen residue over the entire length of the main body in the axial direction of the cylinder. This further prevents the suction hole from being blocked by screen residue.

[0013] A fourth aspect of the present invention is the water sampling strainer according to the second or third aspect of the present invention, characterized in that only one extension portion is attached to the circumferential surface.

[0014] According to the fourth aspect of the present invention, when a flow occurs in the sewage in which the water sample strainer is immersed, the water sample strainer assumes a position such that the extension direction of the extension portion is approximately parallel to the flow of the sewage. This makes it possible for the water sample strainer according to the fourth aspect of the present invention to prevent the extension portion from acting as resistance to the flow of sewage.

[0015] A fifth aspect of the present invention is a water sampling strainer according to the second or third aspect of the present invention, characterized in that the two extension portions are attached at positions equally spaced apart in the circumferential direction of the circumferential surface.

[0016] According to the fifth aspect of the present invention, when a flow occurs in the sewage in which the water sample strainer is immersed, the water sample strainer more reliably assumes an orientation in which the extension directions of the two extension parts are approximately parallel to the flow of the sewage. This makes it possible for the water sample strainer according to the fifth aspect of the present invention to more reliably prevent the extension parts from acting as resistance to the flow of sewage.

[0017] A sixth aspect of the present invention is a water sampling strainer in the second or third aspect of the present invention, characterized in that three or more of the extension portions are attached at equally spaced positions in the circumferential direction of the circumferential surface.

[0018] According to the sixth aspect of the present invention, even if sediment becomes entangled in the water sampling strainer, the three or more extensions ensure space around the suction hole, preventing the suction hole from being blocked by sediment. Furthermore, even if the water sampling strainer is immersed in, for example, a pond at a sewage treatment plant with the axial direction of the cylinder of the main body substantially horizontal, the three or more extensions prevent the circumferential surface of the main body from coming into contact with sand at the bottom of the pond at the sewage treatment plant. This prevents sand at the bottom of the pond at the sewage treatment plant from being sucked through the suction hole.

[0019] A seventh aspect of the present invention is the water sampling strainer according to any one of the first to sixth aspects of the present invention, characterized in that the suction hole is provided at the base of the extension portion.

[0020] According to the seventh aspect of the present invention, since the suction hole is provided at the base of the extension part, even if sediment becomes entangled in the water sampling strainer, space can be secured around the suction hole, i.e., near the base of the extension part, and the suction hole can be prevented from being blocked by sediment. [Effects of the Invention]

[0021] According to the present invention, it is possible to provide a water sampling strainer that can prevent the suction hole that sucks in sewage from being blocked by screen residue contained in the sewage. [Brief explanation of the drawings]

[0022] [Figure 1] FIG. 1 is a top view showing a water sampling device according to the present embodiment. [Figure 2] FIG. 1 is a front view showing a water sampling device according to an embodiment of the present invention. [Figure 3] FIG. 2 is a cross-sectional view taken along the line AA in FIG. [Figure 4] FIG. 2 is a first right side view showing the water sampling device according to the present embodiment. [Figure 5] FIG. 2 is a second right side view showing the water sampling device according to the present embodiment. [Figure 6] FIG. 2 is a plan view showing the water sampling strainer according to the present embodiment. [Figure 7] FIG. 7 is a cross-sectional view taken along the cutting plane BB shown in FIG. [Figure 8] FIG. 2 is a plan view showing the water sampling strainer according to the present embodiment. [Figure 9] 9 is a cross-sectional view taken along a cutting plane CC shown in FIG. 8. [Figure 10] FIG. 2 is a plan view showing the water sampling strainer according to the present embodiment. [Figure 11] FIG. 11 is a cross-sectional view taken along a cutting plane DD shown in FIG. [Figure 12] 1 is a schematic diagram showing a state in which the axial direction of the water sampling strainer according to this embodiment is approximately horizontal. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0023] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. The embodiments described below are preferred examples of the present invention, and therefore various technically preferable limitations are applied thereto, but the scope of the present invention is not limited to these aspects unless otherwise specified in the following description to the effect that the present invention is particularly limited. Furthermore, in each drawing, similar components are designated by the same reference numerals, and detailed descriptions thereof will be omitted as appropriate.

[0024] FIG. 1 is a top view showing the water sampling device according to this embodiment. FIG. 2 is a front view showing the water sampling device according to this embodiment. FIG. 3 is a cross-sectional view taken along the cutting plane AA shown in FIG. FIG. 4 is a first right side view showing the water sampling device according to this embodiment. FIG. 5 is a second right side view showing the water sampling device according to this embodiment. 3 shows the cover 31 in an open state relative to the main body 3, and also shows the scattering suppression section 33 in an imaginary state relative to the main body 3 when the cover 31 is closed. For ease of explanation, the cooling vessel 62 is omitted from FIG. For ease of explanation, the water sampling container 61, the load cell 63, the water sampling valve 52, etc. are omitted from FIG.

[0025] The water sampler 2 according to this embodiment collects sewage samples. The location where the water sampler 2 collects sewage samples is, for example, the inflow channel of a primary sedimentation tank in a sewage treatment plant. However, the location where the water sampler 2 collects sewage samples is not limited to this, and the sampler 2 may collect sewage samples at other locations in the sewage treatment plant or in a sewer channel located below a manhole.

[0026] The water sampling device 2 according to this embodiment comprises a main body 3, a water sampling strainer 4, a pump 51, a water sampling container 61, a cooling container 62, and a load cell 63. The water sampling device 2 further comprises a control unit 71, an operation unit 72, a mounting unit 64, a lid unit 31, a scattering suppression unit 33, a water sampling valve 52, a drain valve 53, a cleaning liquid tank 73, and a cleaning valve 54.

[0027] The main body 3 supports various components such as the pump 51, cooling container 62, load cell 63, control unit 71, and operation unit 72, and has wheels 35 and legs 36 at the bottom. A worker can use the wheels 35 to transport the water sampling device 2 to a sewage sampling location, and can use the legs 36 to set up the water sampling device 2 at the sewage sampling location. The structure, shape, and material of the main body 3 are not particularly limited as long as they can support the various components, and may be formed from a frame material or plate material, for example.

[0028] The water sampling strainer 4 is connected to the pump 51 via a first pipe 571. The water sampling strainer 4 has suction holes 412 (see, for example, Figure 6) formed on its side. When the pump 51 operates while the water sampling strainer 4 is immersed in sewage, the water sampling strainer 4 can suck in the sewage through the suction holes 412. In other words, the suction holes 412 serve as an inlet for sucking in the sewage. The sewage sucked in through the suction holes 412 of the water sampling strainer 4 flows through the first pipe 571 and is led to the pump 51. Details of the water sampling strainer 4 will be described later.

[0029] The pump 51 is fixed to the bottom of the main body 3 and sucks sewage through the water sampling strainer 4 and the first pipe 571. The pump 51 in this embodiment is, for example, a tube pump. However, the pump 51 is not limited to a tube pump. In the following explanation, a case where the pump 51 is a tube pump will be taken as an example.

[0030] By rotating in the forward direction, the pump 51 sucks in sewage through the water sampling strainer 4 and the first pipe 571 and delivers the sewage toward the branch joint 55. The sewage delivered from the pump 51 flows through the second pipe 572 and the third pipe 573 in this order and is led to the branch joint 55. As shown in FIGS. 3 and 4 , the water sampling device 2 according to this embodiment is equipped with a flow meter 56. The flow meter 56 is provided between the second pipe 572 and the third pipe 573, and measures the flow rate of sewage flowing through the second pipe 572 and the third pipe 573. It should be noted that the water sampling device 2 according to this embodiment does not necessarily have to be equipped with the flow meter 56.

[0031] The cooling container 62 is fixed to the top of the main body and houses the water sampling container 61. As shown in Figures 1 and 3, the cooling container 62 has an opening 621 at the top. The water sampling container 61 can pass through the opening 621 of the cooling container 62. An operator or the like can place the water sampling container 61 in the cooling container 62 through the opening 621 of the cooling container 62.

[0032] The cooling container 62 has a cooler, which can cool the temperature inside the cooling container 62 to a temperature lower than the temperature outside the cooling container 62 (i.e., the outside air temperature). An example of the cooler included in the cooling container 62 is a Peltier unit including a Peltier element. However, the cooler included in the cooling container 62 is not limited to a Peltier unit including a Peltier element. By operating the cooler, the cooling container 62 maintains the temperature inside the cooling container 62 at, for example, about 0°C or higher and 5°C or lower. This allows the cooling container 62 to maintain the temperature of the sewage sample stored in the water sampling container 61 housed inside the cooling container 62 at, for example, about 0°C or higher and 5°C or lower. However, the internal temperature maintained by the cooling container 62 by operating the cooler is not limited to 0°C or higher and 5°C or lower.

[0033] The water sampling container 61 is placed on the mounting portion 64 inside the cooling container 62 and stores the sewage discharged from the pump 51 as a sample. Specifically, the sewage discharged from the pump 51 flows through the second pipe 572, the third pipe 573, the branch joint 55, the fourth pipe 574, and the fifth pipe 575, in this order, before being led to the water sampling valve 52. As shown in FIG. 1, the fourth pipe 574 is connected to the fifth pipe 575 via the first joint 581. When the control unit 71 opens the water sampling valve 52, the sewage led to the water sampling valve 52 passes through the water sampling valve 52, flows through the water sampling pipe 521, and is stored as a sewage sample in the water sampling container 61 housed in the cooling container 62. As shown in FIG. 1, the fourth pipe 574 and the fifth pipe 575 form the water sampling path R1.

[0034] The mounting part 64 is placed on the load cell 63 inside the cooling container 62 and supports the water sampling container 61. In other words, the mounting part 64 is installed inside the cooling container 62. As shown in FIGS. 3 and 4 , the mounting part 64 has a holding part 641. The holding part 641 holds the lower part 611 of the water sampling container 61 when the water sampling container 61 is placed on the mounting part 64. In this way, the holding part 641 of the mounting part 64 prevents the water sampling container 61 from tilting or falling over, and prevents the sewage sample from overflowing from the water sampling container 61.

[0035] The load cell 63 is provided inside the cooling container 62 and measures the mass of the sewage sample stored in the water sampling container 61.

[0036] The lid 31 can rotate relative to the main body 3 around an axis 311 extending parallel to the top surface 32 of the main body 3, as indicated by arrow A11 in FIG. 3 . Specifically, as shown in FIG. 1 , the lid 31 is supported on the top surface 32 of the main body 3 via a hinge 312. This allows the lid 31 to rotate relative to the main body 3 around the axis 311 of the hinge 312. For example, an operator can easily rotate the lid 31 relative to the main body 3 by grasping a grip 315 provided on the top surface 314 of the lid 31. Also, as shown in FIG. 3 , the lid 31 is supported on the top of the main body 3 by a stay 34. The stay 34 maintains the open state of the lid 31 relative to the main body 3, limits the angle at which the lid 31 opens relative to the main body 3, and limits the speed at which the lid 31 closes relative to the main body 3.

[0037] When the lid part 31 is closed relative to the main body 3, it blocks the opening 621 of the cooling container 62, sealing the cooling container 62. On the other hand, when the lid part 31 is opened relative to the main body 3, it opens the opening 621 of the cooling container 62, opening the cooling container 62. When the lid part 31 is open relative to the main body 3, an operator or the like can place the water sampling container 61 in the cooling container 62 through the opening 621 of the cooling container 62.

[0038] As shown in FIG. 3 , the water sampling valve 52 is provided on the upper surface 314 of the lid 31. Because the water sampling valve 52 is fixed to the lid 31, it rotates relative to the main body 3 around the axis 311 of the hinge 312 as the lid 31 rotates. The water sampling valve 52 opens and closes the water sampling path R1 based on a control signal transmitted from the control unit 71. That is, when the water sampling valve 52 is open, it allows liquids such as sewage to pass through, and when it is closed, it stops the flow of liquid. As shown in FIGS. 1 and 4 , when the lid 31 is closed relative to the main body 3, the water sampling valve 52 is located directly above the water sampling container 61 placed on the placement portion 64 and held in the holding portion 641.

[0039] The scattering suppression section 33 is provided on the underside 313 of the lid section 31, opposite the upper side 314 of the lid section 31. When the lid section 31 is closed on the main body 3, the scattering suppression section 33 faces the water sampling container 61 placed on the mounting section 64 and held in the holding section 641. The scattering suppression section 33 has an enclosure section 331. As shown by the two-dot chain line in Figure 3, the enclosure section 331 extends from the underside 313 of the lid section 31 toward the water sampling container 61 and surrounds the upper part 612 of the water sampling container 61 when the lid section 31 is closed on the main body 3.

[0040] As a result, the enclosure 331 of the scattering suppression unit 33 can prevent the sewage sample from scattering outside the water sampling container 61 when it is collected in the water sampling container 61. Furthermore, the enclosure 331 of the scattering suppression unit 33 can prevent the water sampling container 61 from tilting or falling over. This can prevent the sewage sample from overflowing from the water sampling container 61.

[0041] 4, when the lid 31 is closed relative to the main body 3, the water sampling pipe 521 extends from the lid 31 through the enclosure 331 toward the water sampling container 61. When the lid 31 is closed relative to the main body 3, the tip 522 of the water sampling pipe 521 is located at a position retracted from the lower end 332 of the enclosure 331 toward the lid 31 and inside the water sampling container 61.

[0042] This prevents the sewage that has passed through the water sampling valve 52 from leaking outside the water sampling container 61, and ensures that the sewage that has passed through the water sampling valve 52 is guided into the water sampling container 61. It also prevents the tip 522 of the water sampling pipe 521 from being immersed in the sewage sample stored in the water sampling container 61, thereby reducing the risk of the sewage sample stored in the water sampling container 61 flowing back toward the pump 51 due to the opening and closing operation of the water sampling valve 52, etc.

[0043] Like the water sampling valve 52, the drain valve 53 is provided on the upper surface 314 of the lid 31. Because the drain valve 53 is fixed to the lid 31, it rotates relative to the main body 3 around the axis 311 of the hinge 312 as the lid 31 rotates. The drain valve 53 opens and closes the drain path R2 based on a control signal sent from the control unit 71. In other words, the water sampling valve 52 allows liquids such as sewage to pass by opening, and stops the flow of liquids by closing.

[0044] Specifically, when the water sampling device 2 performs common washing of the water sampling path R1 using sewage discharged from the pump 51, for example, the control unit 71 rotates the pump 51 in the forward direction and opens the drain valve 53. The sewage discharged from the pump 51 flows through the second pipe 572, the third pipe 573, the branch joint 55, the fourth pipe 574, and the fifth pipe 575, in that order, and then through the sixth pipe 576 and the seventh pipe 577, in that order, before being guided to the drain valve 53. As shown in FIG. 1, the sixth pipe 576 is connected to the fifth pipe 575 via the second joint 582 and to the seventh pipe 577 via the third joint 583. When the control unit 71 opens the drain valve 53, the sewage guided to the drain valve 53 passes through the drain valve 53 and flows through the drain pipe 531, as indicated by arrow A12 in FIG. 1, to be discharged. The destination of the sewage is, for example, a place where the water sampling strainer 4 is immersed, that is, a flow path into which the sewage is sucked.

[0045] 1, the fourth pipe 574, the fifth pipe 575, the sixth pipe 576, and the seventh pipe 577 form a drainage path R2. As shown in Fig. 1, the drainage path R2 partially includes the water sampling path R1. In other words, a portion of the drainage path R2 overlaps with the water sampling path R1.

[0046] The cleaning liquid tank 73 is fixed to the upper part of the main body 3 and stores a cleaning liquid. The cleaning liquid stored in the cleaning liquid tank 73 is, for example, a liquid containing sodium hypochlorite. However, the cleaning liquid stored in the cleaning liquid tank 73 is not limited to a liquid containing sodium hypochlorite. The capacity of the cleaning liquid tank 73 is, for example, about 3 liters.

[0047] 3 and 4, the flushing valve 54 is provided on the top surface 32 of the main body 3. Because the flushing valve 54 is not fixed to the lid portion 31, unlike the water inlet valve 52 and the drain valve 53, the flushing valve 54 does not rotate relative to the main body 3 around the axis 311 of the hinge 312 in conjunction with the rotation of the lid portion 31.

[0048] When the water sampling device 2 cleans the water sampling path R1 with cleaning liquid stored in the cleaning liquid tank 73, the control unit 71 rotates the pump 51 in the reverse direction and opens the cleaning valve 54. The cleaning liquid delivered from the cleaning liquid tank 73 flows through the eighth pipe 578, the ninth pipe 579, the branch joint 55, the fourth pipe 574, and the fifth pipe 575 in this order, and is guided to the water sampling valve 52. As shown in FIG. 1 , the eighth pipe 578 is connected to the ninth pipe 579 via the fourth joint 584.

[0049] 1, the eighth pipe 578, the ninth pipe 579, the fourth pipe 574, and the fifth pipe 575 form a cleaning liquid path R3. As shown in Fig. 1, the cleaning liquid path R3 partially includes the water sampling path R1. In other words, a portion of the cleaning liquid path R3 overlaps with the water sampling path R1.

[0050] 1, the fourth pipe 574, which forms part of the cleaning liquid path R3, is connected to the cleaning valve 54 via the branch joint 55, the ninth pipe 579, and the eighth pipe 578, and extends in a direction parallel to the axis 311 of the hinge 312. The fourth pipe 574 of this embodiment is an example of the "first pipe connected to the cleaning valve and extending in a direction parallel to the axis" of the present invention. A fifth pipe 575 forming a part of the cleaning liquid path R3 is connected to the fourth pipe 574 via a first joint 581, and is connected to the water sampling valve 52 via a second joint 582. As shown in FIG. 1 , the fifth pipe 575 straddles the axis 311 of the hinge 312 and extends in a direction intersecting the axis 311 of the hinge 312.

[0051] In this way, the fifth pipe 575 straddles the rotation axis 311 of the lid part 31 and extends in a direction intersecting the rotation axis 311 of the lid part 31, while the fourth pipe 574 extends in a direction parallel to the rotation axis 311 of the lid part 31. As a result, even when the lid part 31 rotates around the axis 311 of the hinge 312 to open and close, as shown in Fig. 3, the fourth pipe 574 extending in a direction parallel to the rotation axis 311 of the lid part 31 twists, thereby alleviating the bending of the fifth pipe 575 and making it possible to prevent kinking of the fifth pipe 575.

[0052] The control unit 71 controls the operation of the pump 51, the water sampling valve 52, the drain valve 53, and the cleaning valve 54 based on signals received from the operation unit 72. The control unit 71 has an arithmetic processing unit and a memory unit (not shown). The arithmetic processing unit is, for example, a CPU (central processing unit) and reads out programs stored in the memory unit to perform various calculations and processes. The programs include a sequence program for collecting sewage samples, a sequence program for co-washing the water sampling path R1 with sewage, a sequence program for draining sewage remaining in the water sampling path R1, and a sequence program for cleaning the water sampling path R1 with cleaning liquid. The memory unit may be a semiconductor memory or a hard disk drive (HDD), etc.

[0053] The operation unit 72 has an operation panel 721, and transmits a signal input by an operator or the like in response to an operation of the operator or the like on the operation panel 721 to the control unit 71. An example of the operation panel 721 is a touch panel that can detect contact with the operator's finger. However, the operation panel 721 is not limited to a touch panel.

[0054] Next, the operation of the water sampling device 2 according to this embodiment will be described. First, a worker transports and installs the water sampling device 2 to, for example, a sewage treatment plant. Next, the worker immerses the water sampling strainer 4 in sewage, for example, in the inflow channel of a primary sedimentation tank of the sewage treatment plant. Next, the worker operates the operation panel 721 to input the sewage sampling operation.

[0055] Then, based on the signal sent from the operation unit 72, the control unit 71 rotates the pump 51 in the normal direction and opens the drain valve 53, so that the sewage discharged from the pump 51 is guided to the drainage path R2. As described above, the drainage path R2 includes the water sampling path R1 as a part thereof, so the sewage discharged from the pump 51 flows through the water sampling path R1. This allows the sewage discharged from the pump 51 to perform co-washing of the water sampling path R1.

[0056] After that, when a predetermined time has passed or when a predetermined amount of sewage has flowed through drainage path R2, control unit 71 closes drainage valve 53 and opens water sampling valve 52 to guide the sewage discharged from pump 51 into water sampling container 61. As a result, the sewage sucked into pump 51 through water sampling strainer 7 and discharged from pump 51 is collected as a sewage sample and stored in water sampling container 61.

[0057] When the mass of the sewage sample measured by the load cell 63 reaches a predetermined mass, the control unit 71 executes control to close the water sampling valve 52. This stops the sewage sampling operation. As described above, the sewage sample stored in the water sampling container 61 is maintained at a temperature, for example, above 0°C and below 5°C, inside the cooling container 62.

[0058] Next, the control unit 71 closes the water sampling valve 52 and then rotates the pump 51 in the reverse direction. As a result, the sewage remaining in the water sampling path R1 and the drainage path R2 is sucked by the pump 51 and discharged through the water sampling strainer 7. The control unit 71 also stops the operation of the pump 51 and opens the water sampling valve 52 and the drainage valve 53. As a result, the sewage remaining in the water sampling path R1 and the drainage path R2 passes through the drainage valve 53 and other parts and is discharged by its own weight. In this way, the control unit 71 collects a sewage sample, closes the water sampling valve 52, and then controls the draining of the sewage remaining in the water sampling path R1 and the drainage path R2.

[0059] Next, when an operator or the like operates the operation panel 721 to input a cleaning operation for the water sampling route R1, the control unit 71 rotates the pump 51 in the reverse direction and opens the cleaning valve 54, directs the cleaning liquid stored in the cleaning liquid tank 73 into the water sampling route R1, fills the water sampling route R1 with the cleaning liquid, and then stops the pump 51. As a result, the cleaning liquid that fills the water sampling route R1 can dissolve solid matter such as microorganisms contained in the sewage and attached to the water sampling route R1, making it easier to peel off from the water sampling route R1.

[0060] Thereafter, when a predetermined time has elapsed since the control unit 71 stopped the pump 51, the control unit 71 rotates the pump 51 in the forward direction and opens the drain valve 53, so that the sewage discharged from the pump 51 is guided to the drainage path R2. As described above, the drainage path R2 includes the water sampling path R1 as a part thereof, so the sewage discharged from the pump 51 flows through the water sampling path R1. This allows the sewage discharged from the pump 51 to perform co-washing of the water sampling path R1.

[0061] Thereafter, after a predetermined time has elapsed, or when a predetermined amount of sewage has flowed through drainage path R2, control unit 71 rotates pump 51 in the reverse direction and closes drainage valve 53. As a result, the sewage remaining in water sampling path R1 and drainage path R2 is sucked by pump 51 and discharged through water sampling strainer 7. Control unit 71 also stops the operation of pump 51 and opens water sampling valve 52 and drainage valve 53. As a result, the sewage remaining in water sampling path R1 and drainage path R2 is discharged through drainage valve 53 and other passages by its own weight. In this way, control unit 71 performs a cleaning operation on water sampling path R1 to perform co-washing of water sampling path R1, and then controls to drain the sewage remaining in water sampling path R1 and drainage path R2.

[0062] In the water sampling device 2 according to this embodiment, the cooling container 62 is fixed to the main body 3, accommodates the water sampling container 61, and cools the sewage sample stored in the water sampling container 61 to a temperature lower than the ambient temperature. This facilitates control of the specific gravity of the sewage sample. It also suppresses the proliferation of viruses and microorganisms other than the target of detection, ensuring a certain level of the target viruses and microorganisms. The load cell 63 is provided inside the cooling container 62 and measures the mass of the sewage sample stored in the water sampling container 61. Thus, the water sampling device 2 according to this embodiment does not directly measure the volume of the sewage sample. Rather, it measures the volume of the sewage sample based on the mass measured by the load cell 63, with the specific gravity of the sewage sample being controlled in the cooling container 62. This allows the water sampling device 2 according to this embodiment to reduce variation in the volume of the sewage sample and collect a more accurate volume of sewage sample.

[0063] Furthermore, lid 31 is rotatable relative to main body 3 about axis 311 extending parallel to top surface 32 of main body 3, and when closed relative to main body 3, closes opening 621 of cooling container 62, sealing cooling container 62. In this way, lid 31 does not slide parallel to top surface 32 of main body 3, but rotates relative to main body 3 about axis 311 extending parallel to top surface 32 of main body 3, and closes opening 621 of cooling container 62. Therefore, lid 31 more reliably seals cooling container 62, ensuring the cooling performance of cooling container 62.

[0064] Furthermore, when the lid 31 is closed to the main body 3, the water sampling valve 52 is positioned directly above the water sampling container 61. This makes it possible to shorten the length of the water sampling piping 521 that exists between the water sampling valve 52 and the water sampling container 61. This makes it possible to reduce the amount of sewage sample that remains in the water sampling piping 521 between the water sampling valve 52 and the water sampling container 61 after the sewage sample collection operation is completed. Therefore, when the next sewage sample collection operation is performed, it is possible to reduce the amount of sewage sample remaining from the previous collection operation that gets mixed into the sewage sample to be collected in the next collection operation.

[0065] The control unit 71 also controls the operation of the water sampling valve 52 and the drain valve 53, and when a sewage sample is collected, the water sampling path R1 is washed with sewage pumped from the pump 51. This prevents liquids other than the target from being mixed into the sewage sample to be collected. The control unit 71 also controls the operation of the water sampling valve 52 and the drain valve 53, and closes the water sampling valve 52 when the mass measured by the load cell 63 reaches a predetermined mass. This allows the water sampling device 2 according to this embodiment to collect a more accurate amount of sewage sample while preventing liquids other than the target from being mixed into the sewage sample to be collected.

[0066] Furthermore, after completing the operation of collecting the sewage sample, the control unit 71 executes control to drain the sewage remaining in the water sampling route R1 and the drainage route R2, thereby preventing solid matter, such as organisms contained in the sewage, from remaining attached to the water sampling route R1 and the drainage route R2.

[0067] Furthermore, after the operation of collecting the sewage sample is completed, when an operator or the like operates the operation panel 721 to input the operation of cleaning the water sampling route R1, the control unit 71 rotates the pump 51 in the reverse direction and opens the cleaning valve 54, and introduces the cleaning liquid stored in the cleaning liquid tank 73 into the water sampling route R1, filling the water sampling route R1 with the cleaning liquid. This dissolves solid matter such as microorganisms contained in the sewage and attached to the water sampling route R1, making it easier to peel off from the water sampling route R1.

[0068] Furthermore, the control unit 71 soaks and dissolves solid matter, such as microorganisms contained in the sewage and attached to the water sampling route R1, in a cleaning solution, making it easier to peel off from the water sampling route R1, and then performs co-washing of the water sampling route R1 and the drainage route R2 with the sewage sent out from the pump 51. The control unit 71 then executes control to rotate the pump 51 in the reverse direction and close the drainage valve 53, thereby draining the sewage remaining in the water sampling route R1 and the drainage route R2. As a result, the water sampling device 2 according to this embodiment can wash away solid matter, such as microorganisms that have peeled off from the water sampling route R1, and can prevent solid matter, such as organisms contained in the sewage, from remaining attached to the water sampling route R1.

[0069] Next, the water sampling strainer 4 according to this embodiment will be described with reference to the drawings. FIG. 6 is a plan view showing the water sampling strainer according to this embodiment. FIG. 7 is a cross-sectional view taken along the cutting plane BB shown in FIG. The water sampling strainer 4 shown in Figs. 6 and 7 is the water sampling strainer according to the first embodiment.

[0070] 6, the water sampling strainer 4 according to this embodiment includes a main body 41, an end portion 42, a connecting portion 43, and an extension portion 44. The water sampling strainer 4 according to this embodiment includes one extension portion 44.

[0071] The main body 41 has suction holes 412 on its side surface 411 for sucking in sewage. Specifically, the suction holes 412 are provided on the circumferential surface of the cylindrical main body 41. The main body 41 sucks in sewage into the inside of the main body 41 through the suction holes 412. In other words, the suction holes 412 serve as an inlet for sucking in sewage.

[0072] The end 42 is provided at one end of the main body 41 and is closed. In other words, sewage is not sucked from the end 42, but is sucked into the inside of the main body 41 only through the suction hole 412. The connection part 43 is provided at the other end of the main body 41. In other words, the connection part 43 is provided at the end of the main body 41 opposite to the end part 42. The connection part 43 is connected to the first pipe 571 (see FIG. 1). As a result, the sewage sucked through the suction hole 412 of the water sampling strainer 4 flows through the first pipe 571 and is guided to the pump 51.

[0073] As shown in Fig. 7, the extension 44 is attached to a side surface 411 of the main body 41 and extends from the side surface 411 of the main body 41 toward the outside of the main body 41. Specifically, the extension 44 is attached to the circumferential surface of the cylindrical main body 41 and extends from the circumferential surface of the main body 41 toward the outside in the radial direction of the main body 41. As shown in Figs. 6 and 7, the extension 44 is plate-shaped and is provided over the entire length of the cylindrical main body 41 in the direction of the axis 413 of the main body 41.

[0074] 6, the water sampling strainer 4 according to this embodiment has a plurality of suction holes 412. At least some of the plurality of suction holes 412 are provided at the base of the extension portion 44.

[0075] Here, sewage contains residue such as hair and lint. As a result, when the water sampling strainer sucks in the sewage, the residue can become tangled around the water sampling strainer 4. According to the findings of the present invention, tangled residue occurs when the residue circles around the water sampling strainer and wraps around the entire circumference of the strainer, causing both ends of the residue to become twisted together. Once tangled residue occurs, it can grow from the point where the tangled residue occurs. If the tangled residue grows, it can clog the suction hole of the water sampling strainer that sucks in the sewage, potentially making it impossible for the water sampling strainer to suck in the sewage.

[0076] In contrast to this, in the water sampling strainer 4 according to this embodiment, the extension 44 is attached to the side surface 411 of the main body 41, in which the suction hole 412 for sucking in sewage is provided, and extends from the side surface 411 of the main body 41 toward the outside of the main body 41. In addition, the extension 44 makes the apparent length L1 of the periphery of the main body 41 longer than the periphery of the side surface 411 of the main body 41.

[0077] In the water sampling strainer 4 according to this embodiment, the extension 44 can prevent the screened residue from going around the water sampling strainer 4 and wrapping around the entire circumference of the water sampling strainer 4, causing both ends of the screened residue to become twisted together. According to the knowledge of the inventors, when the apparent length L1 of the circumference of the main body 41 is 300 mm or more, it is possible to effectively prevent the screened residue from going around the water sampling strainer 4 and wrapping around the entire circumference of the water sampling strainer 4, causing both ends of the screened residue to become twisted together. This can prevent the screened residue from becoming entangled in the water sampling strainer 4. This can prevent the suction hole 412, which draws in sewage, from being blocked by the screened residue contained in the sewage.

[0078] Furthermore, because the main body 41 is cylindrical, it is possible to form the cylindrical main body 41 by bending, for example, a plate-like punched metal having holes. Furthermore, for example, by attaching a plate-like member to the circumferential surface of the main body 41 by welding or the like, it is possible to form an extension 44 that extends radially outward from the circumferential surface of the main body 41. As a result, the water sampling strainer 4 according to this embodiment has a relatively simple structure and can prevent the suction hole 412 from being blocked by sediment.

[0079] The extension 44 is provided over the entire length of the cylindrical main body 41 in the direction of the axis 413 of the main body 41. Therefore, it is possible to prevent entanglement of residue over the entire length of the main body 41 in the direction of the axis 413 of the main body 41. This further prevents the suction hole 412 from being blocked by residue.

[0080] Furthermore, in the water sample strainer 4 according to this embodiment, only one extension 44 is attached to the circumferential surface of the main body 41. Therefore, when a flow occurs in the sewage in which the water sample strainer 4 is immersed, the water sample strainer 4 takes a position such that the extension direction of the extension 44 is approximately parallel to the flow of the sewage. This makes it possible for the water sample strainer 4 according to this embodiment to prevent the extension 44 from acting as a resistance to the flow of sewage.

[0081] Furthermore, since at least some of the multiple suction holes 412 are located at the base of the extension portion 44, even if sediment becomes entangled in the water sampling strainer 4, space can be secured around the suction holes 412, i.e., near the base of the extension portion 44, preventing all of the suction holes 412 from being blocked by sediment.

[0082] Next, a water sampling strainer according to another embodiment will be described with reference to the drawings. In addition, in cases where the components of the water sampling strainers 4A and 4B of other embodiments are similar to the components of the water sampling strainer 4 of the first embodiment described above with reference to Figures 6 to 7, duplicate explanations will be omitted as appropriate, and the following explanation will focus on the differences.

[0083] FIG. 8 is a plan view showing the water sampling strainer according to this embodiment. FIG. 9 is a cross-sectional view taken along the cutting plane CC shown in FIG. The water sampling strainer 4A shown in Figs. 8 and 9 is a water sampling strainer according to the second embodiment.

[0084] As shown in Figures 8 and 9, the water sample strainer 4A according to this embodiment comprises a main body 41, an end portion 42, a connecting portion 43, and an extension portion 44. The water sample strainer 4A according to this embodiment comprises two extension portions 44. The two extension portions 44 are attached to the circumferential surface of the main body 41 at positions spaced apart at equal intervals in the circumferential direction. In other words, the two extension portions 44 are attached to the circumferential surface of the main body 41 at positions spaced apart at an interval of 180° in the circumferential direction. The two extension portions 44 make the apparent length L2 of the periphery of the main body 41 longer than the periphery of the side surface 411 of the main body 41. The rest of the structure is similar to the components of the water sample strainer 4 according to the first embodiment described above with reference to Figures 6 and 7.

[0085] With the water sampling strainer 4A according to this embodiment, when a flow occurs in the sewage in which the water sampling strainer 4A is immersed, the water sampling strainer 4A more reliably assumes a position in which the extension direction of the two extensions 44 is approximately parallel to the flow of the sewage. This more reliably prevents the extensions 44 from acting as resistance to the flow of sewage. Furthermore, the same effects as those described above for the water sampling strainer 4 according to the first embodiment can be obtained.

[0086] FIG. 10 is a plan view showing the water sampling strainer according to this embodiment. FIG. 11 is a cross-sectional view taken along the cutting plane DD shown in FIG. FIG. 12 is a schematic diagram showing a state in which the axial direction of the water sampling strainer according to this embodiment is substantially horizontal. The water sampling strainer 4B shown in Figs. 10 to 12 is a water sampling strainer according to the third embodiment. FIG. 12 corresponds to a cross-sectional view taken along the cutting plane DD shown in FIG.

[0087] As shown in Figures 10 and 11, the water sample strainer 4B according to this embodiment includes a main body 41, an end portion 42, a connection portion 43, and an extension portion 44. The water sample strainer 4B according to this embodiment includes three or more extension portions 44. In the example shown in Figures 10 and 11, the water sample strainer 4B includes four extension portions 44. Note that the number of extension portions 44 included in the water sample strainer 4B according to this embodiment may be three or more, is not limited to four, and may be three or five or more. In the following explanation, a case where the water sample strainer 4B includes four extension portions 44 will be given as an example.

[0088] The four extensions 44 are attached at positions spaced apart at equal intervals in the circumferential direction of the circumferential surface of the main body 41. In other words, the four extensions 44 are attached at positions spaced apart at 90° intervals in the circumferential direction of the circumferential surface of the main body 41. The four extensions 44 make the apparent length L3 of the periphery of the main body 41 longer than the periphery of the side surface 411 of the main body 41. The other structure is similar to the components of the water sampling strainer 4 according to the first embodiment described above with reference to Figures 6 and 7.

[0089] With the water sample strainer 4B according to this embodiment, even if sediment becomes entangled in the water sample strainer 4B, the three or more extensions 44 ensure space around the suction hole 412, preventing the suction hole 412 from being blocked by the sediment. Furthermore, as shown in FIG. 12, even if the water sample strainer 4B is immersed in a pond at a sewage treatment plant, for example, with the axis 413 of the cylindrical main body 41 oriented substantially horizontally, the three or more extensions 44 prevent the circumferential surface of the main body 41 (i.e., the side surface 411) from contacting the sand 8 at the bottom of the pond at the sewage treatment plant. This prevents the sand 8 at the bottom of the pond at the sewage treatment plant from being sucked through the suction hole 412. Furthermore, the same effects as those described above for the water sample strainer 4 according to the first embodiment can be obtained.

[0090] The above describes the embodiments of the present invention. However, the present invention is not limited to the above embodiments, and various modifications can be made without departing from the scope of the claims. The configurations of the above embodiments can be partially omitted or arbitrarily combined in a different manner from the above. [Explanation of symbols]

[0091] 2: Water sampling device, 3: Main body, 4: Water sampling strainer, 4A: Water sampling strainer, 4B: Water sampling strainer, 7: Water sampling strainer, 8: Sand, 31: Lid, 32: Top surface, 33: Anti-scattering section, 34: Stay, 35: Wheel, 36: Leg, 41: Main body, 42: End, 43: Connection section, 44: Extension section, 51: Pump, 52: Water sampling valve, 53: Drain valve, 54: Cleaning valve, 55: Branch joint, 56: Flow meter, 61: Water sampling container, 62: Cooling container, 63: Load cell, 64: Placement section, 71: Control section, 72: Operation section, 73: Cleaning liquid tank, 311: Shaft, 312: Hinge, 313: Bottom surface, 314: Upper surface, 315: Grip part, 331: Enclosure part, 332: Lower end, 411: Side, 412: Suction hole, 413: Shaft, 521: Water sampling pipe, 522: Tip, 531: Drainage pipe, 571: First pipe, 572: Second pipe, 573: Third pipe, 574: Fourth pipe, 575: Fifth pipe, 576: Sixth pipe, 577: Seventh pipe, 578: Eighth pipe, 579: Ninth pipe, 581: First joint, 582: Second joint, 583: Third joint, 584: Fourth joint, 611: Lower part, 612: Upper part, 621: Opening, 641: Holding part, 721: Operation panel, R1: Water sampling path, R2: Drainage path, R3: Cleaning fluid path

Claims

1. A water sampling strainer that is immersed in sewage and sucks the sewage, a main body having a suction hole on a side surface for sucking the sewage; an extension portion attached to the side surface and extending from the side surface toward the outside of the main body, making the apparent length of the periphery of the main body longer than the periphery of the side surface; A water sampling strainer comprising:

2. The body is cylindrical, The suction holes are provided on the circumferential surface of the cylinder, 2. The water sampling strainer according to claim 1, wherein the extension portion has a plate shape extending from the circumferential surface toward the outside in the radial direction of the main body.

3. 3. The water sampling strainer according to claim 2, wherein the extension portion is provided over the entire length of the main body in the axial direction of the cylinder.

4. 4. A water sampling strainer according to claim 2 or 3, wherein only one of said extensions is provided on said circumferential surface.

5. 4. The water sampling strainer according to claim 2, wherein the two extensions are provided at positions equally spaced apart in the circumferential direction of the circumferential surface.

6. 4. The water sampling strainer according to claim 2, wherein three or more of the extensions are provided at positions equally spaced apart in the circumferential direction of the circumferential surface.

7. 2. The water sampling strainer according to claim 1, wherein the suction hole is provided at the base of the extension portion.

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