Drainage channel

Abstract

To provide a drain tank with an exhaust port provided on a bottom surface that discharges drainage to the outside, which can more reliably suppress inflow of solid matter contained in the drainage into an exhaust port.SOLUTION: The drain tank 1 comprises: a concave storage part 10 for storing the drainage; an inflow port 20 provided on side surfaces 12, 13, 14, 15 of the storage part 10 and into which the drainage flows in; the exhaust port 30 provided on a bottom surface 11 of the storage part 10 to discharge the drainage in the storage part 10 to the outside from the storage part 10; and a weir 40 erected on the bottom surface 11 of the storage part 10, that divides the storage part 10 into a first storage chamber 16 where the inflow port 20 is located and a second storage chamber 17 where the exhaust port 30 is located, wherein the weir 40 is formed so as to partition the first storage chamber 16 and the second storage chamber 17 at a position not facing the inflow port 20 in the storage part 10.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a drainage tank.

Background Art

[0002] [[ID=I2]]Conventionally, for treating wastewater discharged from research institutes, factories, etc. and containing chemicals, etc., equipment for performing wastewater treatment using a drainage tank for temporarily storing wastewater has been known. For example, Patent Documents 1 and 2 disclose this type of equipment. Patent Documents 1 and 2 describe equipment that partitions a drainage tank into a plurality of storage chambers by a weir and discharges the wastewater that has overflowed from the weir from a discharge port provided on the side surface of the drainage tank. The equipment of Patent Document 1 adjusts the pH of the wastewater, and the equipment of Patent Document 2 decomposes organic substances in the wastewater.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0004] By the way, in equipment where a drainage channel or a drainage tank is installed outdoors, a large amount of wastewater containing rainwater, etc. may flow into the drainage tank during rainfall. In order to prevent leakage of wastewater containing chemicals, etc. to the outside, it may be considered to provide a discharge port on the bottom surface of the storage chamber so that the wastewater that has overflowed from the weir flows more smoothly. However, since the discharge port is located on the bottom surface where solids tend to accumulate, in order to suppress clogging of the discharge port, it is required to more reliably suppress the inflow of solids into the storage chamber provided with the discharge port.

[0005] The present invention aims to provide a drainage tank in which a drain outlet for discharging wastewater to the outside is provided on the bottom surface, and which can more reliably suppress the inflow of solid matter contained in the wastewater into the drain outlet. [Means for solving the problem]

[0006] The present invention relates to a drainage tank comprising: a concave storage section for storing drainage; an inlet provided on the side of the storage section for drainage to flow in; an outlet provided on the bottom surface of the storage section for discharging drainage from the storage section to the outside; and a weir erected on the bottom surface of the storage section for dividing the storage section into a first storage chamber where the inlet is located and a second storage chamber where the outlet is located, wherein the weir is formed to divide the storage section into the first storage chamber and the second storage chamber at a position in the storage section that does not face the inlet.

[0007] The upper end of the weir extends to a position higher than the lowest part of the inlet.

[0008] The weir is formed in a cylindrical shape and surrounds the discharge opening.

[0009] The weir is fixed at both ends to the side of the storage section and, together with the side of the storage section, surrounds the discharge port.

[0010] The present invention also relates to a drainage tank comprising: a concave storage section for storing drainage; an inlet provided on the side of the storage section for drainage to flow in; an outlet provided on the bottom surface of the storage section for discharging drainage from the storage section to the outside; and a weir erected on the bottom surface of the storage section, dividing the storage section into a first storage chamber where the inlet is located and a second storage chamber where the outlet is located, wherein the upper end of the weir extends to a position higher than the lowest part of the inlet. [Effects of the Invention]

[0011] According to the present invention, in a drainage tank having an outlet on its bottom for discharging wastewater to the outside, it is possible to provide a drainage tank that can more reliably suppress the inflow of solid matter contained in the wastewater into the outlet. [Brief explanation of the drawing]

[0012] [Figure 1] This is a perspective view showing a drainage tank according to the first embodiment of the present invention. [Figure 2] This is a plan view showing a drainage tank according to the first embodiment of the present invention. [Figure 3] This is a cross-sectional view along line AA in Figure 2. [Figure 4] This is a perspective view showing the weir of a drainage tank according to the first embodiment of the present invention. [Figure 5] This is a perspective view showing a drainage tank according to a second embodiment of the present invention. [Modes for carrying out the invention]

[0013] Preferred embodiments of the present invention will be described below with reference to the drawings. However, the present invention is not limited to the following embodiments.

[0014] First, the configuration of the drainage tank 1 according to the first embodiment of the present invention will be described. Figure 1 is a perspective view of the drainage tank 1, Figure 2 is a plan view of the drainage tank 1, Figure 3 is a cross-sectional view of the drainage tank 1 along line AA, and Figure 4 is a perspective view of the weir 40.

[0015] The drainage tank 1 according to the first embodiment is a tank that stores wastewater discharged from a wastewater source (not shown), such as a factory's pure water system, and discharges it to a wastewater treatment device (not shown), and is located outdoors.

[0016] As shown in Figure 1, the drainage tank 1 is composed of a storage section 10, an inlet 20, an outlet 30, and a weir 40.

[0017] The storage section 10 is recessed into the ground 2. The storage section 10 has a bottom surface 11 and four sides 12, 13, 14, and 15. As shown in Figure 1, the storage section 10 is formed in a box shape capable of storing drainage. The storage section 10 is divided into a first storage chamber 16 and a second storage chamber 17 by a weir 40, which will be described later. Details of the first storage chamber 16 and the second storage chamber 17 will be described later.

[0018] The inflow port 20 is formed on the side surface 12 of the storage portion 10 and connects the groove-shaped drainage channel 3 recessed in the outdoor ground 2 and the storage portion 10. The inflow port 20 is formed in a concave shape having a bottom side 21 and side sides 22, 23. In the present embodiment, the inflow port 20 is on the upper end side of the side surface 12 and is located on the side surface 15 side. The bottom side 21, which is the lowermost part of the inflow port 20, is formed at a position having a height L1 from the bottom surface 11 of the storage portion 10.

[0019] On the upstream side of the drainage channel 3, a drainage source such as a purification device is provided. The drainage including chemicals and rainwater discharged from the drainage source flows through the drainage channel 3 and flows into the storage portion 10 through the inflow port 20.

[0020] The discharge port 30 is provided on the bottom surface 11 of the storage portion 10 and discharges the drainage in the storage portion 10 to the outside of the storage portion 10. The discharge port 30 is substantially rectangular in plan view. A drainage channel 4 (see FIG. 3) is connected to the discharge port 30, and the drainage of the storage portion 10 is sent to the drainage treatment device through this drainage channel 4.

[0021] A strainer 31 is arranged at the discharge port 30. Solid matter 5 such as sludge contained in the drainage flowing into the storage portion 10 is filtered by the strainer 31 of the discharge port 30 when it flows into the discharge port 30.

[0022] As shown in FIG. 4, the weir 40 is formed in a substantially square tube shape as a whole. The weir 40 includes four side walls 41 to 44 and support pieces 45 and 46 extending from the lower ends of the side walls 41 and 43. The side walls 41 to 44 and the support pieces 45 and 46 of the weir 40 are integrally formed.

[0023] As shown in FIG. 1, the weir 40 is erected on the bottom surface 11 of the storage portion 10 so as to surround the discharge port 30. By the weir 40, the storage portion 10 is partitioned into a first storage chamber 16 where the inflow port 20 side is located and a second storage chamber 17 where the discharge port 30 side is located. The first storage chamber 16 is a room for settling the solid matter 5 in the drainage flowing in from the inflow port 20. The second storage chamber 17 is a room for discharging the drainage overflowed from the weir 40 from the discharge port 30.

[0024] The side walls 41 to 44 are perpendicular to the bottom surface 11. As shown in Figure 2, side walls 41 and 43 are formed approximately parallel to the side surface 12 of the storage section 10, and side walls 42 and 44 are formed approximately parallel to the side surface 13 of the storage section 10. Furthermore, side wall 41 is formed closer to the side surface 12 than side wall 43, and side wall 42 is formed closer to the side surface 13 than side wall 44.

[0025] As shown in Figures 1 and 3, the support piece 45 extends from the lower end of the side wall 41 along the bottom surface 11 toward the side surface 12. That is, the portion of the weir 40 consisting of the side wall 41 and the support piece 45 is formed in a roughly L-shape in a longitudinal cross-sectional view. The support piece 45 is fixed to the bottom surface 11 by a screw 45a, which acts as a fastening member. The support piece 46 extends from the lower end of the side wall 43 along the bottom surface 11 toward the side surface 14. That is, the portion of the weir 40 consisting of the side wall 43 and the support piece 46 is formed in a roughly L-shape in a longitudinal cross-sectional view. The support piece 46 is fixed to the bottom surface 11 by a screw 46a, which acts as a fastening member. Because the support pieces 45 and 46 are in surface contact with the bottom surface 11, the weir 40 is firmly fixed by the reservoir 10.

[0026] As shown in Figure 3, the height L2 from the bottom surface 11 to the upper end of the weir 40 is higher than the height L1 from the bottom surface 11 to the bottom edge 21 of the inlet 20. Also, the side walls 41 to 44 are at approximately the same height from the bottom surface 11 of the storage section 10. That is, the side walls 41 to 44 each extend to a position higher than the height L1 from the bottom surface 11 to the bottom edge 21.

[0027] As shown in Figure 2, the weir 40 is formed to divide the storage section 10 into a first storage chamber 16 and a second storage chamber 17 at a position that does not face the inlet 20. That is, in a plan view, the weir 40 is formed at a position that does not coincide with a virtual plane formed between virtual straight lines P1 and P2 that are extended parallel to the side surface 15 toward the side surface 14 along the sides 22 and 23 of the inlet 20.

[0028] Next, the flow of wastewater into the drainage tank 1 will be explained. First, wastewater containing solid matter 5 such as chemicals and sludge in rainwater flows through the drainage channel 3 and into the first storage chamber 16 of the storage section 10 through the inlet 20. At this time, the wastewater that flows into the first storage chamber 16 flows in the direction of virtual straight lines P1 and P2, and then flows around to the second storage chamber 17. For the wastewater to flow into the second storage chamber 17, the height L2 from the bottom surface 11 to the top of the storage section 10 must be higher than the height L1 from the bottom surface 11 to the bottom edge 21 of the inlet 20, thus crossing the weir 40.

[0029] When wastewater accumulates in the first storage chamber 16 and the water level rises to the height L2 of the weir 40, the wastewater overflows from the top of the weir 40 and flows into the second storage chamber 17. As shown in Figure 3, the solid matter 5 contained in the wastewater in the first storage chamber 16 settles on the bottom surface 11 without overflowing from the weir 40 and remains in the first storage chamber 16. This prevents the solid matter 5 contained in the wastewater from flowing into the outlet 30 and prevents clogging of the strainer 31 of the outlet 30 by the solid matter 5. Therefore, leakage of chemicals into the surrounding area of ​​the wastewater tank 1 due to clogging of the outlet 30 can be prevented.

[0030] Next, a drainage tank 100 according to the second embodiment of the present invention will be described with reference to Figure 5. Note that components similar to those in the first embodiment may be denoted by the same reference numerals and their descriptions may be omitted.

[0031] The inlet 120 is formed in a concave shape, having a base 121 and side edges 122 and 123, similar to the inlet 20 in the first embodiment. The inlet 120 is located at the upper end of the side surface 12 of the storage section 10 and on the side surface 15 side. Furthermore, the inlet 120 is located on the side surface 13 side than the inlet 20 in the first embodiment.

[0032] As shown in Figure 5, the weir 140 is formed in a roughly L-shape overall in plan view. The weir 140 is composed of two side walls 141 and 142, and support pieces 143 to 146 extending from the lower end and one side end of each of the side walls 141 and 142. The side walls 141 and 142 and the support pieces 143 to 146 of the weir 140 are formed integrally.

[0033] As shown in Figure 5, the weir 140 is erected on the bottom surface 11 of the storage section 10, with its two end supports 144 and 146 (described later) fixed to the sides 12 and 13 of the storage section 10, and surrounding the discharge port 30 together with the sides 12 and 13. The side walls 141 and 142 are formed perpendicular to the bottom surface 11. One end of side wall 141 contacts the side 12 and is formed approximately parallel to the side 13, and one end of side wall 142 contacts the side 13 and is formed approximately parallel to the side 12.

[0034] As shown in Figure 5, the support piece 143 extends from the lower end of the side wall 141 along the bottom surface 11 toward the side surface 15 of the reservoir 10. That is, the portion of the weir 140 consisting of the side wall 141 and the support piece 143 is formed in a roughly L-shape in a longitudinal cross-sectional view. The support piece 143 is fixed to the bottom surface 11 by a screw 143a, which serves as a fastening member.

[0035] The support piece 144 extends from one end of the side wall 141 along the side surface 12 towards the side surface 15 of the reservoir 10. That is, the portion of the weir 140 consisting of the side wall 141 and the support piece 144 is formed in a roughly L-shape in plan view. The support piece 144 is fixed to the side surface 12 by a screw 144a, which serves as a fastening member.

[0036] The support piece 145 extends from the lower end of the side wall 142 along the bottom surface 11 towards the side surface 14 of the reservoir 10. That is, the portion of the weir 140 consisting of the side wall 142 and the support piece 145 is formed in a roughly L-shape in a longitudinal cross-sectional view. The support piece 145 is fixed to the bottom surface 11 by a screw 145a, which serves as a fastening member.

[0037] The support piece 146 extends from one end of the side wall 142 along the side surface 13 towards the side surface 14 of the reservoir 10. That is, the portion of the weir 140 consisting of the side wall 142 and the support piece 146 is formed in a roughly L-shape in plan view. The support piece 146 is fixed to the side surface 13 by a screw 146a, which serves as a fastening member.

[0038] Since the support pieces 143 to 146 make surface contact with the bottom surface 11 and the sides 12 and 13 of the storage section 10, the weir 140 is more firmly fixed to the storage section 10. In addition, since the support pieces 144 and 146 at both ends of the weir 140 are fixed to the sides 12 and 13 of the storage section 10, the weir 140 is supported by the sides 12 and 13 even when lateral pressure is applied to the side walls 141 and 142.

[0039] As shown in Figure 5, the height L2 from the bottom surface 11 to the upper end of the weir 140 is higher than the height L1 from the bottom surface 11 to the bottom edge 121 of the inlet 120. Also, the side walls 141 and 142 are at approximately the same height from the bottom surface 11 of the storage section 10. That is, the side walls 141 and 142 each extend to a position higher than the height L1 from the bottom surface 11 to the bottom edge 121.

[0040] As shown in Figure 5, the weir 140 is formed to divide the storage section 10 into a first storage chamber 16 and a second storage chamber 17 at a position that does not face the inlet 120. That is, in a plan view, the weir 140 is formed at a position that does not coincide with a virtual plane formed between virtual straight lines P1 and P2 that are extended parallel to the side surface 15 toward the side surface 14 from the sides 122 and 123 of the inlet 120.

[0041] According to the drainage tanks 1 and 100 of the embodiment described above, the following effects are achieved.

[0042] The drainage tank 1 comprises a concave storage section 10 in which drainage is stored, inlets 20 and 120 provided on the sides 12, 13, 14, and 15 of the storage section 10 for drainage to flow in, an outlet 30 provided on the bottom surface 11 of the storage section 10 for discharging drainage from the storage section 10 to the outside, and weirs 40 and 140 erected on the bottom surface 11 of the storage section 10, which divide the storage section 10 into a first storage chamber 16 where the inlets 20 and 120 are located and a second storage chamber 17 where the outlet 30 is located. The weirs 40 and 140 are formed to divide the storage section 10 into the first storage chamber 16 and the second storage chamber 17 at a position that does not face the inlets 20 and 120 in the storage section 10.

[0043] As a result, since there are no weirs 40 and 140 in the direction of wastewater inflow, the wastewater flowing into the storage section 10 from the inlets 20 and 120 flows in the direction of virtual straight lines P1 and P2 before flowing around into the second storage chamber 17. Because the wastewater flows into the second storage chamber 17 in a curved manner, the force of the water flowing into the second storage chamber 17 is weakened compared to when it flows in a straight line. Therefore, even when a large amount of wastewater flows forcefully into the wastewater tank 1,100, it is possible to prevent the wastewater from overflowing the weirs 40 and 140 due to the force of the water, and the inflow of solid matter 5 contained in the wastewater into the outlet 30 can be suppressed more reliably.

[0044] The upper ends of weirs 40 and 140 extend to a position higher than the lowest part of inlets 20 and 120.

[0045] As a result, the wastewater does not flow into the outlet 30 unless it exceeds the weirs 40,140, ​​whose upper ends are higher than the lowest parts of the inlets 20,120. Therefore, even when the flow velocity of the wastewater flowing into the drainage tank 1,100 is high, the direct flow of wastewater containing solid matter 5 into the outlet 30 can be more reliably suppressed, and clogging of the outlet 30 by solid matter 5 can be suppressed. Thus, leakage of wastewater to the outside can be prevented. In addition, the frequency of cleaning work to remove clogging of the strainer 31 located at the outlet 30 can be reduced.

[0046] The weir 40 is formed in a cylindrical shape and surrounds the discharge port 30.

[0047] This makes it possible to easily install the weir 40 even if the discharge port 30 is not located near the sides 12, 13, and 14 of the storage section 10.

[0048] The weir 140 has both ends fixed to the sides 12 and 13 of the storage section 10, and together with the sides 12 and 13 of the storage section 10, it surrounds the discharge port 30.

[0049] As a result, the sides 12 and 13 of the storage section 10 are used to surround the outlet 30, so even if lateral water pressure is applied due to the drainage flowing into the side walls 141 and 142, the weir 140 is supported by the sides 12 and 13, thereby increasing the strength of the weir 140.

[0050] Although embodiments of the present invention have been described above, the present invention is not limited to the embodiments described above and can be modified as appropriate.

[0051] In the embodiment described above, the height L2 from the bottom surface 11 to the upper end of the weir 40,140 is higher than the height L1 from the bottom surface 11 to the bottom 21,121 of the inlet 20,120, but height L2 may be lower than height L1. In this case, it is preferable that the height L2 from the bottom surface 11 to the upper end of the weir 40,140 is at least half the height L1 from the bottom 21,121 of the inlet 20,120. As a result, when wastewater has accumulated up to the upper end of the weir 40,140, ​​the distance from the inlet 20,120 to the water surface of the first storage chamber 16 becomes shorter than the distance from the water surface of the first storage chamber 16 to the bottom surface 11. Therefore, the force of the wastewater falling from the inlet 20,120 to the water surface of the first storage chamber 16 and reaching the bottom surface 11 is weakened, and solid matter 5 such as sludge settled on the bottom surface 11 is suppressed from being stirred up to the water surface. [Explanation of symbols]

[0052] 1,100 drainage tank 10 Storage section 11 Bottom 12, 13, 14, 15 Side view 16. First storage chamber 17. Second storage chamber 20, 120 Inlet 30 Outlet 40, 140 weir

Claims

1. In a drainage tank intended for wastewater containing chemicals and / or solid matter in rainwater, A concave storage section where wastewater is stored, An inlet is provided on the side of the aforementioned storage section for wastewater to flow in, A discharge port is provided on the bottom surface of the storage section for discharging the wastewater from the storage section to the outside, The system includes a weir erected on the bottom surface of the storage section, which divides the storage section into a first storage chamber where the inlet is located and a second storage chamber where the outlet is located. The weir is formed to divide the storage section into a first storage chamber and a second storage chamber at a position not facing the inlet, The upper end of the weir extends to a position lower than the top of the inlet and higher than the bottom of the inlet, forming a drainage tank.

2. The drainage tank according to claim 1, wherein the weir is formed in a cylindrical shape and surrounds the discharge port.

3. The drainage tank according to claim 1, wherein the weir is fixed at both ends to the side surface of the storage section and surrounds the discharge port together with the side surface of the storage section.

4. In a drainage tank intended for wastewater containing chemicals and / or solid matter in rainwater, A concave storage section where wastewater is stored, An inlet is provided on the side of the aforementioned storage section for wastewater to flow in, A discharge port is provided on the bottom surface of the storage section for discharging the wastewater from the storage section to the outside, The system includes a weir erected on the bottom surface of the storage section, which divides the storage section into a first storage chamber where the inlet is located and a second storage chamber where the outlet is located. The upper end of the weir extends to a position lower than the top of the inlet and higher than the bottom of the inlet, forming a drainage tank.

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