JP2017197976A - Malodor prevention type drainage equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide malodor prevention type drainage equipment that can suppress putrefaction by decreasing a residual quantity of waste water when drainage operation of a pump is over and that can be easily installed and prevent malodor.SOLUTION: A malodor prevention type drainage equipment comprises a waste water tank, a water level sensor and a land pump. The waste water tank is stored in a pit which is a drainage tank installed at a position lower than a sewage pipe and stores discharged water temporarily. The water level sensor is installed in the waste water tank and detects a water level in the waste water tank. The land pump is installed outside the waste water tank in the pit and is connected to a water outlet of the waste water tank and operates according to a water level in the waste water tank to be detected by the water level sensor.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a malodor-preventing drainage facility.

  As shown in FIG. 10, the basement portion B of the building 100 may be located below the public sewer pipe 80. Conventionally, sewage, miscellaneous drainage and the like (hereinafter referred to as sewage etc.) generated in the basement part B are temporarily stored in a large drainage tank 85 installed further below through an inflow pipe 81. Thereafter, the sewage or the like is pumped up to the sewage basin 91 by the drainage pump 90 installed in the drainage tank 85 and drained into the public sewer pipe 80 through the sewage basin 93. In addition, the sewage etc. which generate | occur | produce in the 1st floor or more part of the building 100 are normally drained into the sewage basin 91 directly under natural flow.

  In such a facility, the pump 90 is started to operate when the water level in the drain tank 85 reaches a predetermined water level. However, if the water level in the drainage tank 85 does not reach the predetermined level and if sewage or the like remains at the bottom of the drainage tank 85 for a long period of time, the decay will proceed and a bad odor will be generated from the manhole when discharged into the public sewer pipe 80 There is a case.

  The above problem is conspicuous because the drain tank 85 is too large, and the area of the bottom of the tank is large, and the amount of remaining sewage is increased. In order to improve this, in the drainage tank 85 shown in FIG. 10, a slope descending toward the drainage pump 90 is provided on the bottom board 87 of the drainage tank 85, or a recess 89 is provided on the bottom board 87 where the pump 90 is installed. Are equal. Further, by improving the operation method of the pump 90, for example, after the pump 90 is operated to the pump-off water level WL2, the operation of the drain pump 90 is continued for a predetermined time so as to reduce the amount of remaining sewage as much as possible. I have to.

  However, even if improved as described above, the amount of residual sewage and miscellaneous wastewater is still large, and it has not yet been possible to suppress the progress of decay of sewage and miscellaneous drainage. For this reason, the malodor prevention type drainage equipment which has arrange | positioned the cylindrical water tank (barrel) in the drainage tank (pit) conventionally, and employ | adopted the pump in the barrel is proposed.

Japanese Patent No. 4455742

  In the malodor-preventing drainage described above, the diameter of the barrel is designed to match the diameter of the manhole so that the barrel can be carried into the pit through the manhole formed in the pit. Moreover, since the diameter of a barrel is restrict | limited, one submersible pump is arrange | positioned at one barrel. Since the diameter of the barrel cannot be increased, it is difficult for a plurality of people to enter the barrel, and operations such as cleaning the barrel are complicated. When maintaining the submersible pump, for example, a pipe connected to the pump is removed and the pump is pulled up from above the barrel. In a submersible pump for sewage, the attachment / detachment device may perform the attachment / detachment of the pump, but it is difficult to install the attachment / detachment device in a limited space of the barrel.

Conventionally, a float type water level sensor is installed in the barrel, but the space in the barrel is limited and it may overlap with the installation location of the pump. Install the float type water level sensor in the correct position. It was difficult. Since the pump is started / stopped based on detection from the float type water level sensor, if the water level sensor is not properly installed, sewage will not be discharged properly.

  This invention is made | formed in view of the above-mentioned point, and makes it one of the objectives to reduce corruption by reducing residual amounts, such as sewage at the time of completion | finish of the drain operation of a pump. Another object of the present invention is to provide a malodor-preventing drainage facility that is easy to install and maintain and can prevent the generation of malodor.

The malodor prevention type drainage system of the present invention includes a sewage tank, a water level sensor, and a land pump. A sewage tank is accommodated in the pit which is a drain tank installed in a position lower than the sewer pipe, and temporarily stores the drained water. The water level sensor is provided in the sewage tank and detects the water level in the sewage tank. The land pump is provided outside the sewage tank in the pit, connected to the outlet of the sewage tank, and operated according to the water level in the sewage tank detected by the water level sensor.
With such a configuration, in the malodor prevention type equipment of the present invention, a sewage tank is provided in the pit. Corruption can be suppressed. Moreover, since the land pump is provided outside the sewage tank, the land pump can be replaced outside the sewage tank, and maintenance and replacement of the pump can be easily performed. Furthermore, since the land pump is provided outside the sewage tank, the water level sensor can be easily installed in the sewage tank.

The water level sensor may also include a first float that detects a stop water level that is higher than the suction port of the land pump, and a second float that detects a start water level that is higher than the stop water level. Good. The onshore pump stops operation when the water level sensor detects that the water level has fallen below the stop water level, and starts when the water level sensor detects that the water level has risen above the starting water level. Also good.
If it carries out like this, based on the water level sensor provided in the sewage tank, control of a land pump can be performed easily.

Moreover, the cover which prevents disturbance of a water level may be provided in at least one of the 1st float and the 2nd float.
This can prevent the detection of the water level sensor from being disturbed.

In addition, a plurality of land pumps may be provided at the outlet of the sewage tank, and the plurality of land pumps may be connected in parallel to the sewer pipe. The malodor prevention drainage system performs a replacement operation in which some of the plurality of land pumps are operated with replacement and / or a parallel operation in which all of the plurality of land pumps are operated simultaneously. May be.
In this way, even if an abnormality occurs in some of the plurality of land pumps, the water can be drained using another land pump. Moreover, when the inflow to the sewage tank is small, the energy efficiency can be improved by performing a replacement operation, and when the inflow to the sewage tank is large, the drainage from the sewage tank can be sufficiently performed by performing the parallel operation. .

A gate valve may be connected to the suction port and the discharge port of the land pump.
In this way, it is possible to easily replace the land pump.

Further, the land pump may be a vertical shaft pump.
If it carries out like this, space saving of a malodor prevention type drainage facility can be achieved. Moreover, even if it is a case where water leaks out of a sewage tank and water is stored in a pit, it can suppress that a land pump gets wet.

Moreover, a recessed part may be formed in the bottom face of a sewage tank, and an outflow port may be provided in the side surface of a recessed part. Furthermore, the outflow port of the sewage tank and the suction port of the land pump may be connected by a suction pipe. And the height of the lower end of suction piping may be lower than the height of the lower end of an outflow port.
If it carries out like this, while being able to suppress inhalation of air during the driving | running of a land pump, residual amounts, such as sewage at the time of completion | finish of the drainage operation of a pump, can be reduced and decay can be suppressed.

Further, the bottom surface of the sewage tank may be formed with a slope that becomes lower as it is closer to the outlet.
If it carries out like this, the sewage etc. in a sewage tank can be guided toward an outflow port, and the amount of residuals, such as sewage at the time of completion | finish of the drainage operation of a pump, can be decreased and decay can be suppressed.

Further, the sewage tank is formed by a plurality of panel members, and each of the plurality of panel members may have a length of at least a short side of the plate surface equal to or less than a diameter of an opening formed in the pit.
If it carries out like this, a panel member can be carried in in a pit through the opening formed in the pit. Moreover, since the sewage tank is formed by a plurality of panel members, the size of the sewage tank can be determined in accordance with the amount of water flowing into the sewage tank, for example.

The sewage tank may have an internal space defined by a bottom surface, a side surface, and a top surface by a plurality of panels.
In this way, it is possible to prevent a bad odor from being generated in the pit and from the opening.

  The sewage tank may be a single barrel or a plurality of barrels.

  Moreover, it is preferable that the sewage tank can store water commensurate with the inflow amount of water and has a spare capacity.

Moreover, you may further provide the reserve pump which is provided in a pit separately from a land pump and drains the water stored in the pit outside.
By so doing, even when water leaks out of the sewage tank and the water is stored in the pit, the water can be drained to the outside by the auxiliary pump.

It is a whole block diagram of the malodor prevention type drainage equipment which concerns on 1st Embodiment. It is a whole block diagram of the malodor prevention type drainage equipment which concerns on 1st Embodiment. It is a perspective view which abbreviate | omits a part of panel member and shows the sewage tank which concerns on this embodiment. It is a figure which shows typically carrying in of the panel member in a pit. It is a figure which shows an example of a water level sensor. It is a figure which shows another example of a water level sensor. It is a whole block diagram of the malodor prevention type drainage equipment which concerns on 2nd Embodiment. It is a whole block diagram of the malodor prevention type drainage equipment which concerns on 2nd Embodiment. It is a whole block diagram of the malodor prevention type drainage equipment which concerns on a modification. It is a schematic sectional side view which shows an example of the conventional drainage equipment.

(First embodiment)
Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 and FIG. 2 are the whole block diagrams of the malodor prevention type drainage equipment which concerns on 1st Embodiment. Here, FIG. 1 is a schematic plan view of a malodor-preventing drainage facility (a view of the pit Pi side seen from the basement portion B shown in FIG. 2), and FIG. 2 is a schematic sectional side view of the malodor-preventing drainage facility. . This malodor-preventing drainage system can be suitably used to discharge the drainage from the basement portion B located at a position lower than the public sewer pipe in a building (for example, a building) to the public sewer pipe 80.

  As shown in FIGS. 1 and 2, the malodor-preventing drainage system 10 is provided in a pit Pi that is a drainage tank installed below a basement portion B of a building (for example, a building) 100. An opening (manhole) 24 is formed in the pit Pi, and a lid 25 is attached to the opening 24. As shown in FIG. 2, the malodor prevention drainage 10 includes a sewage tank 12 provided in the pit Pi and a pump 20 connected to the outlet 16 of the sewage tank 12. In the present embodiment, two pumps 20 are connected to the sewage tank 12.

  The sewage tank 12 has a substantially rectangular parallelepiped shape (box shape) as a whole, and has an internal space defined by a bottom surface 12a, a side surface 12b, and a top surface 12c. The sewage tank 12 may store water corresponding to the inflow amount of sewage according to the scale of the building and the amount of water used in the basement portion B, and may be formed to have a spare capacity. . An opening 13 is formed in the upper surface 12 c of the sewage tank 12, and the opening 13 is covered with a lid 14. An inflow pipe 15 is inserted into the sewage tank 12 through the lid 14. The inflow pipe 15 is piped from the basement part B, and allows sewage generated in the basement part B to flow into the sewage tank 12. However, the inflow pipe 15 is not limited to passing through the lid 14 of the sewage tank 12 and the lid 25 of the pit Pi, and may pass through the side surface 12b or the upper surface 12c of the sewage tank 12 or the side surface of the pit Pi. Or it may be piped through the upper surface.

  In FIG. 3, an outflow port 16 through which stored sewage and the like flow out is provided on the bottom surface 12 a of the sewage tank 12, and two pumps 20 are connected in parallel to the outflow port 16. The outlet 16 may be provided separately for each of the two pumps 20 or may be provided by being integrated by the two pumps 20. In this embodiment, the outflow port 16 is a recess, and is designed so that the lower end of the suction pipe 23 of the pump 20 and the lower end of the outflow port 16 have the same height. Thus, by forming the outflow port 16 recessed in the bottom surface 12a of the sewage tank 12, the sewage in the sewage tank 12 is guided to the outflow port 16, and when the drainage operation of the pump 20 is finished, the sewage etc. It is possible to reduce the residual amount of the sewage tank 12 and suppress the rot in the sewage tank 12. Further, in the present embodiment, the bottom surface 12 a of the sewage tank 12 is provided with an inclination such that the height increases as the distance from the outlet 16 increases, and the height decreases as the distance from the outlet 16 decreases. Thereby, the sewage etc. in the sewage tank 12 can be guided to the outlet 16 more effectively, and the generation of malodor can be prevented.

  Moreover, like the sewage tank of FIG. 2, a recess may be provided on the bottom surface 12a of the sewage tank 12 to guide the sewage, and the outlet 16 may be provided near the bottom surface of the side surface 12b of the recess. In this case, the height of the lower end of the suction pipe 23 of the pump 20 is designed to be equal to or lower than the height of the lower end of the outlet 16. Furthermore, the bottom surface 12a of the sewage tank 12 is provided with an inclination such that the height increases as the distance from the outlet 16 increases, and the height decreases as the distance from the outlet 16 decreases. Thereby, the sewage etc. in the sewage tank 12 can be more effectively guided to the outlet 16, the idling operation of the pump 20 can be prevented, and further the generation of malodor can be prevented.

  As shown in FIG. 2, a water level sensor 26 is installed in the sewage tank 12. This water level sensor 26 is a float type, and can measure the current water level. In the present embodiment, the water level sensor 26 includes a first float 26a that detects the stop water level Hs1 of the pump 20, and a second float 26b that detects the activation water level Hs2 of the pump 20 that is higher than the stop water level Hs1. Yes. Here, the stop water level Hs1 is preferably set to a position higher than the suction port height Hp of the pump 20 so that air is not sucked during operation of the pump 20. Further, as a backup when the first and second floats 26a and 26b fail, a spare float may be provided between the start water level and the stop water level. Further, a float for controlling the number of pumps 20 may be provided.

  FIG. 5 is a diagram illustrating an example of the water level sensor, and FIG. 6 is a diagram illustrating another example of the water level sensor. When sewage or the like flows into the sewage tank 12 from the inflow pipe 15 or when sewage or the like flows out of the sewage tank 12 from the outlet 16 as the pump 20 is operated, a wave is generated in the sewage in the sewage tank 12. There is a possibility that the detection of the water level by the water level sensor 26 may be affected. For this reason, in this embodiment, as shown in FIGS. 5 and 6, a cover 27 for protecting the floats 26a and 26b is provided. As shown in FIG. 5, a panel member may be provided as the cover 27 so as to face the floats 26a and 26b. Moreover, as the cover 27, as shown in FIG. 6, a C-shaped panel member may be provided as viewed in the vertical direction so as to cover the floats 26a and 26b. The panel member and the bottom surface 12a of the sewage tank 12 are not in close contact with each other and provide a space. With this space, the same water level is formed on the float 26 side and the outside of the float 26 partitioned by the cover 27, and the water level in the sewage tank 12 can be normally measured by the float 26. The cover 27 may be supported by being mechanically connected to the water level sensor 26 or may be supported by the sewage tank 12. Further, the cover 27 is not limited to covering one or three directions of the floats 26a and 26b, and may cover two or four directions. Further, the cover 27 may be provided only on the first float 26 a close to the outlet 16. Thus, by providing the cover that covers the floats 26a and 26b, it is possible to suppress the occurrence of an error in the detection of the water level by the water level sensor 26.

  The description returns to FIGS. The pump 20 is a well-known on-shore pump, and is provided for draining sewage stored in the sewage tank 12 to the outside. The pump 20 is a vertical shaft pump. The vertical shaft pump can be installed in a smaller installation area than the horizontal shaft pump, and is effective for installation in a limited space in the pit Pi. Further, in the vertical shaft type pump, the pump 20 is connected above the suction pipe 23, so that when the pump 20 is removed from the suction pipe 23, it is possible to prevent sewage or the like in the suction pipe 23 from leaking into the pit Pi. Therefore, the amount of leakage of sewage at the time of replacement or maintenance is reduced compared with the horizontal axis pump, and workability is improved. Further, since a motor 21 (not shown in FIG. 1) for driving the pump 20 is installed on the upper part of the pump 20, even when sewage overflows from the sewage tank 12 and water is stored in the pit Pi. The motor 21 can be prevented from getting wet. Thereby, the water resistance of the motor 21 can be lowered. However, it is preferable that the motor 21 be waterproofed in preparation for unexpected situations such as heavy rain.

  Each of the two pumps 20 has a suction pipe 23 connected to the suction port and a discharge pipe 22 connected to the discharge port. A gate valve 18 is provided in each of the suction pipe 23 and the discharge pipe 22 for each pump 20 for replacement and maintenance of the pump 20. The discharge pipe 22 is provided with a backflow prevention valve 17. By closing the gate valve 18, the pump 20 can be replaced and maintained in a state where the other pump can drain water without draining sewage from the sewage tank 12 and the discharge pipe 22. The backflow prevention valve 17 may be provided in the suction pipe 23 instead of or in addition to the discharge pipe 22.

  FIG. 3 is a perspective view showing the sewage tank according to the present embodiment with a part of the panel member omitted, and FIG. 4 is a view schematically showing the panel member carried into the pit. As shown in FIG. 3, the sewage tank 12 is formed by connecting a plurality of panel members 120. Each of the plurality of panel members 120 defines a bottom surface 12a, a side surface 12b, and a top surface 12c of the sewage tank 12. In addition, in FIG. 1, the division | segmentation of the several panel member 120 in the sewage tank 12 is shown with the dashed-dotted line. As shown in FIGS. 1, 2, and 3, in this embodiment, the bottom surface and the top surface are formed by 3 × 5 panel members 120 and the side surfaces are formed by three heights. The dirty water tank 12 is formed by 78 panel members 120. However, it is not limited to such an example, The sewage tank 12 should just be formed with the panel member 120 of arbitrary numbers.

  The plurality of panel members 120 are made of, for example, resin or metal. Further, the panel member 120 may be formed of a plurality of layers of materials, for example, a fiber reinforced plastic (FRP) excellent in heat insulation, a synthetic resin foam, a synthetic resin exterior, or the like may be laminated. Good. Each of the plurality of panel members 120 has a side length Lp smaller than the diameter Dm of the opening 24 so that it can pass through the opening (manhole) 24 formed in the pit Pi (see FIG. 2). For example, in this embodiment, the opening 24 of the pit Pi has a columnar shape with a diameter Dm of 600 mm, and each of the plurality of panel members 120 has a side of the plate surface smaller than the diameter Dm and is approximately 500 mm square. However, the plurality of panel members 120 do not have to have the same size plate surface shape. For example, the panel member 120 that defines the bottom surface and the panel member 120 that defines the side surface may have different sizes. Good. The panel member 120 is not limited to the length of each side of the plate surface smaller than the diameter Dm of the opening 24, and the long side of the plate surface may be larger than the diameter Dm and the short side may be smaller than the diameter Dm. . By determining the size of the panel member 120 as described above, the panel member 120 can be carried into the pit Pi from the basement portion B through the opening 24 as shown in FIG. For this reason, the panel member 120 can be carried into the pit Pi without newly forming an opening in the basement portion B and the pit Pi.

  Among the plurality of panel members 120, the panel member 120 constituting the upper surface 12 c is formed with an opening 13 and provided with a lid 14. Moreover, the recessed part for comprising the outflow port 16 is formed in a part of panel member 120 which comprises the bottom face 12a. If the panel member 120 constituting the outlet 16 has the same size as the panel member constituting the other bottom surface 12a, the pump can be easily pumped even after the sewage tank 12 is installed by replacing some of the panel members 120. 20 can be added. Here, as described above, in the present embodiment, the outlet 16 is a concave portion and protrudes downward as compared with the panel member 120 constituting the other bottom surface 12a. For this reason, in this embodiment, the mount frame 19 which supports the sewage tank 12 is provided. The mount 19 has a height Ht that is greater than the depth Dh of the outlet 16 (see FIG. 3). The gantry 19 is made of, for example, metal, resin, concrete, or the like, and is connected to the sewage tank 12 with an anchor bolt or the like (not shown). By providing the gantry 19 in this manner, the sewage tank 12 can be placed in the pit Pi without filling all gaps formed below the sewage tank 12 with concrete or making holes in the bottom surface of the pit Pi corresponding to the outlet 16. Can be installed.

  Next, a method for installing the sewage tank 12 in the pit Pi will be described. When installing the sewage tank 12 in the pit Pi, first, a plurality of panel members 120 for assembling the sewage tank 12 are prepared. That is, a plurality of panel members 120 having a length Lp on one side (at least a short side on the plate surface) smaller than the diameter Dm of the opening 24 formed in the pit Pi are prepared. Subsequently, the prepared plurality of panel members 120 are carried into the pit Pi from the basement portion B through the opening 24 (see FIG. 4). And the sewage tank 12 is formed by assembling a plurality of panel members 120 in the pit Pi. At this time, the sewage tank 12 may be formed on the gantry 19. Moreover, the pump 20 should just be connected and installed in the outflow port 16 of the sewage tank 12 after the sewage tank 12 is assembled. Further, the plurality of panel members 120 may be connected using screws or the like, or may be connected by adhesion or welding. Further, in order to reinforce the sewage tank 12, a reinforcing member may be provided on at least one of the inside and the outside of the sewage tank 12. The assembled sewage tank 12 is preferably sealed except for a flow path (the inflow pipe 15 and the outflow port 16) such as sewage and a vent hole (not shown). By so doing, it is possible to suppress the generation of bad odor in the pit Pi and the basement portion B.

The operation of the pump 20 in the malodor prevention type drainage facility 10 will be described. First, sewage or the like generated in the basement portion B is accumulated in the sewage tank 12 through the inflow pipe 15. When the water level sensor 26 detects that the water level in the sewage tank 12 has become equal to or higher than the activation water level Hs2 (the second float 26b is ON) or when a predetermined time has elapsed since the previous operation was stopped. Start driving. Accordingly, the pump 20 sucks sewage and the like through the outlet 16 of the sewage tank 12 and the suction pipe 23 of the pump 20 and drains the sewage and the like into the sewage tank 91 through the discharge pipe 22. The sewage drained into the sewage basin 91 is drained into the public sewer pipe 80 through the sewage basin 93. When the water level in the sewage tank 12 falls below the stop water level Hs1, this is detected by the water level sensor 26 (the first float 26a is OFF), and the pump 20 is stopped. In the present embodiment, since the stop water level Hs1 is set at a position higher than the pump suction port height Hp, the sewage or the like disappears during the operation of the pump 20, and the pump 20 sucks air to generate an air lock. Can be prevented from breaking down.

  When starting the pump 20, the operating pump is rotated. That is, a replacement operation is performed in which one of the two pumps 20 operates with replacement. This prevents water from staying in the pump for a long time. Furthermore, if the water level does not decrease to the stop water level even if one pump 20 is operated, or if the water level in the sewage tank 12 reaches a predetermined water level higher than the starting water level Hs2, an operation pump is added. . That is, the parallel operation in which all of the two pumps 20 are operated simultaneously is performed. In this embodiment, the pump 20 is provided outside the sewage tank 12, and a plurality of pumps 20 can be installed in one sewage tank 12. For this reason, for example, in an office building where water is hardly used at night, a plurality of small-capacity pumps 20 are installed. When the amount of drainage is low, such as at night, one pump is operated. Energy saving can be achieved by controlling the number of pumps operated, such as operating with pumps. Here, in the present embodiment, the two pumps 20 are provided. However, in the case where three or more pumps are provided, a replacement operation in which one or more pumps 20 out of a plurality of pumps 20 are operated with replacements. A parallel operation in which all of the plurality of pumps 20 are simultaneously operated can be performed. Thereby, energy saving of the malodor prevention drainage 10 can be achieved. Moreover, since it is possible to perform an appropriate pump operation corresponding to the amount of sewage, etc., it is possible to reduce the amount of sewage remaining in the sewage tank 12, and to reduce the amount of spoilage and prevent the generation of bad odors. it can.

  If the pump 20 is controlled to operate after detecting that water has flowed into the sewage tank 12 by the water level sensor 26, the operation is performed when a predetermined time has elapsed since the previous operation was stopped. Compared with the case of controlling to start, the residence time of the sewage in the sewage tank 12 can be shortened.

  In the malodor prevention drainage system 10 of the present embodiment described above, the plurality of panel members 120 are carried into the pit Pi through the openings 24 of the pit Pi, and the plurality of panel members 120 are assembled to form the sewage tank 12. . For this reason, the drainage tank of an existing building can be used as it is as the pit Pi for housing the sewage tank 12 of the present embodiment, and the odor prevention drainage system 10 of the present embodiment can be economically improved. Further, the sewage tank 12 is sealed except for a flow path of sewage and the like and a vent (not shown), and an opening 13 and a lid 14 are provided above the sewage tank 12. Further, the sewage tank 12 has an internal space defined by an upper surface, a side surface, and a bottom surface, and the interior is covered by the lids 14 and 25 in each of the sewage tank 12 and the pit Pi. Can be prevented.

A pump 20 is provided outside the sewage tank 12 in the pit Pi. For this reason, the worker can replace the pump 20 outside the sewage tank 12 without entering the sewage tank 12, and can easily perform maintenance and replacement of the pump 20. Further, in the drainage facility in which the pump 20 is installed in the conventional sewage tank 12, the pump 20 and the water level sensor 26 and the like are arranged in a limited space in the sewage tank 12, so that the floats 26a and 26b are particularly aligned. Has become difficult. In addition, since the float 26a is installed in the immediate vicinity of the suction port of the pump 20, there is a problem that detection by the water level sensor 26 becomes unstable due to water flow or the float 26a is sucked by the pump 20 and removed. It was. On the other hand, in this embodiment, since the pump 20 is outside the sewage tank 12, the alignment of the floats 26a and 26b is facilitated. Further, since the suction port of the pump 20 and the float 26a are separated from each other, it is difficult to be influenced by the water flow, and the detection of the stop water level by the float 26a is accurate. Further, a space for providing the cover 27 as shown in FIGS. 5 and 6 can be easily secured. For this reason, starting / stopping of the pump 20 can be appropriately performed, and the amount of residual sewage at the end of the drainage operation can be reduced to suppress corruption, and failure of the pump 20 can be suppressed.

(Second Embodiment)
FIG. 7 and FIG. 8 are the whole block diagrams of the malodor prevention type drainage equipment which concerns on 2nd Embodiment. Here, FIG. 7 is a schematic plan view of the malodor-preventive drainage facility 10A, and FIG. 8 is a schematic side sectional view of the malodor-preventive drainage facility 10A. As shown in the drawing, the malodor prevention drainage system 10A of the second embodiment is provided with a barrel 112 in place of the sewage tank 12, and other configurations are the same as those of the malodor prevention drainage system 10 of the first embodiment. is there. The barrel 112 has a bottomed cylindrical shape and does not have a ceiling in this embodiment. The barrel 112 has an outer diameter (for example, 600 mm) smaller than the diameter Dm (for example, 650 mm) of the opening 24 so that the barrel 112 can be carried into the pit Pi from the opening (manhole) 24 of the pit Pi. In the present embodiment, two barrels 112 are installed in the pit Pi, and one pump 20 is connected to the outside of each barrel 112. However, one or three or more barrels 112 may be installed in the pit Pi, and two or more pumps 20 may be connected to one barrel 112. In this embodiment, the two barrels 112 are connected to each other by the communication pipe 40, and the inflow pipe 15 is connected to the inside of the one barrel 112. However, the barrels 112 may not be connected to each other by the communication pipe 40, and the inflow pipe 15 may be connected to each barrel 112.

  Also in the malodor-preventing drainage system 10A of the second embodiment, the pump 20 is provided outside the barrel 112, so that the worker replaces the pump 20 outside the barrel 112 without entering the barrel 112. be able to. Thereby, the maintenance and replacement | exchange of the pump 20 can be easily performed similarly to the malodor prevention drainage system 10 of 1st Embodiment.

(Modification)
FIG. 9 is an overall configuration diagram of a malodor-preventing drainage facility according to a modification. As shown in the figure, in the malodor-preventing drainage system 10B of the modification, a spare pump 30 is provided in the pit Pi separately from the pump 20 connected to the sewage tank 12. The reserve pump 30 has a suction port at the lower end, and drains the water such as sewage stored in the pit Pi to the outside (sewage 91 or the like). The spare pump 30 is activated when, for example, sewage overflows from the sewage tank 12 due to local heavy rain. As the spare pump 30, an existing pump in the pit Pi may be left and used. When the pump 20 connected to the sewage tank 12 is a vertical shaft pump, the suction port height Hpr of the auxiliary pump 30 is smaller than the height Hm of the motor 21 of the pump 20 and the auxiliary pump 30 is used. It is preferable to make the starting water level smaller than the height Hm. In this way, even if water is stored in the pit Pi, the motor 21 is not submerged while it can be drained by the auxiliary pump 30, so that the waterproofing measures for the motor 21 can be simplified.

  In the first embodiment, the bottom surface 12a of the sewage tank 12 is provided with an inclination so as to become lower as the outlet 16 is approached. However, such an inclination may not be provided.

  Further, the water level sensor 26 may not be a float type. Further, the pump 20 may be a horizontal shaft type pump. Further, the number of pumps 20 may be one, or three or more.

Although the embodiments of the present invention have been described above, the above-described embodiments of the present invention are for facilitating the understanding of the present invention and are not intended to limit the present invention. The present invention can be changed and improved without departing from the gist thereof, and the present invention includes the equivalents thereof. Moreover, the range which can solve at least one part of the subject mentioned above,
Alternatively, any combination of the embodiment and the modified example is possible within a range where at least a part of the effect is achieved, and any combination of the constituent elements described in the claims and the specification can be omitted. It is.

B ... Basement part Pi ... Pit 10, 10A, 10B ... Bad odor prevention drainage 12 ... Sewage tank 12a ... Bottom 12b ... Side 12c ... Top 13 ... Opening 14 ... Cover 15 ... Inlet pipe 16 ... Outlet 17 ... Backflow prevention Valve 18 ... Gate valve 19 ... Base 20 ... Pump 21 ... Motor 22 ... Discharge piping 23 ... Suction piping 24 ... Opening 25 ... Lid 26 ... Water level sensor 26a ... First float 26b ... Second float 27 ... Cover 30 ... Spare pump 40 ... Communication pipe 112 ... Barrel 120 ... Panel member

Claims (13)

A sewage tank that is housed in a pit, which is a drain tank installed at a position lower than the sewer pipe, and temporarily stores the drained water;
A water level sensor provided in the sewage tank for detecting the water level in the sewage tank;
A land pump installed outside the sewage tank in the pit and connected to the outlet of the sewage tank, and operated according to the water level in the sewage tank detected by the water level sensor;
Odor prevention type drainage equipment. The water level sensor has a first float that detects a stop water level that is higher than the suction port of the land pump, and a second float that detects a start water level that is higher than the stop water level,
The onshore pump stops operation when the water level sensor detects that the water level has fallen below the stop water level, and when the water level sensor detects that the water level has risen above the start water level. to start,
The malodor prevention type drainage system according to claim 1. At least one of the first float and the second float is provided with a cover for preventing water level disturbance.
The malodor prevention type drainage facility according to claim 2. A plurality of land pumps are provided at the outlet of the sewage tank,
The plurality of land pumps are connected in parallel to the sewer pipe,
Performing a replacement operation in which some of the plurality of land pumps are operated with replacement, and / or a parallel operation in which all of the plurality of land pumps are operated simultaneously,
The malodor prevention type drainage device according to any one of claims 1 to 3. A gate valve is connected to the suction port and the discharge port of the land pump,
The malodor prevention type drainage device according to any one of claims 1 to 4. The land pump is a vertical shaft pump,
The malodor prevention type drainage device according to any one of claims 1 to 5. A recess is formed on the bottom surface of the sewage tank, and the outflow port is provided on a side surface of the recess,
The outlet of the sewage tank and the suction port of the land pump are connected by a suction pipe,
The height of the lower end of the suction pipe is lower than the height of the lower end of the outlet.
The malodor prevention type drainage device according to any one of claims 1 to 6. The bottom surface of the sewage tank is formed with a slope that becomes lower as it approaches the outlet.
The malodor prevention type drainage device according to any one of claims 1 to 7. The sewage tank is formed by a plurality of panel members,
Each of the plurality of panel members has a length of at least a short side of the plate surface equal to or smaller than the diameter of the opening formed in the pit.
The malodor prevention type drainage device according to any one of claims 1 to 8. The sewage tank has an internal space defined by a bottom surface, a side surface, and a top surface by the plurality of panels.
The malodor prevention type drainage facility according to claim 9. The sewage tank is one or a plurality of barrels,
The malodor prevention type drainage device according to any one of claims 1 to 8. The sewage tank can store water commensurate with the inflow of water, and has a spare capacity.
The malodor prevention type drainage device according to any one of claims 1 to 11. Separately from the land pump, provided in the pit, further comprising a reserve pump for draining the water stored in the pit to the outside,
The malodor prevention type drainage device according to any one of claims 1 to 12.

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