JP2007040143A - Manhole pump device and method for operating the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a manhole pump device capable of effectively preventing blockage accident of a pump by foreign matter with a simple structure. <P>SOLUTION: In the manhole pump device 1, a strainer 20 capturing foreign matters in sanitary sewage flowing in from sanitary sewage flow-in pipe 22, one end of the strainer is communicated to the sanitary sewage flow-in pipe 22 and another end thereof is communicated to a delivery part 32 of a pump 30, a check valve 23 is installed between the sanitary sewage flow-in pipe 22 and the strainer 20, a branch part 25 is provided in piping 21 connecting the check valve 23 and the strainer 20, the discharge piping 21 sending discharged water of the pump 3 passing through the strainer 20 out of a manhole 10 is connected to the branch part 25, consequently, discharged water of the pump 30 is made pass through the strainer 20 to backwash the same and remove captured foreign matters. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a manhole pump device used as a pumping facility for relay transportation of sewage and an operation method thereof.

  As a conventional example of a manhole pump device (manhole type sewage relay pump equipment) used for sewage relay transportation, there is one shown in FIG. 1 (Patent Document 1). A manhole pump device 100 shown in the figure includes a manhole 10 and a pump (submersible pump) 30 that is installed in the manhole 10 and sucks up sewage and transfers it to the outside of the manhole 10. The manhole 10 is made of concrete or the like, and includes an opening 10a that opens to the ground at the upper end of a cylindrical side wall 10b. A lid 12 is attached to the opening 10a. On the other hand, a pump mounting base 13 is installed on the bottom 10c of the manhole 10, and a concave portion 13a in which dirty water is accumulated is formed on the pump mounting base 13.

  A pump attaching / detaching device 15 for detachably installing the pump 30 is installed on the upper surface of the pump mounting base 13. The pump attaching / detaching device 15 has a lower end portion of a guide pipe 16 erected vertically in the manhole 10. It is attached. A pump 30 is installed so as to be guided up and down by the guide pipe 16. The pump 30 is suspended by a suspension means 17 such as a chain, is carried into the manhole 10 through the opening 10 a, and descends through the manhole 10 while being guided by the guide pipe 16. It descends to 10c and is attached to the pump attaching / detaching device 15 at that position. At this installation position, the suction port 31 of the pump 30 is disposed in the recess 13a of the pump mounting base 13, and the discharge port 32 of the pump 30 is connected in communication with one end 18a of the curved pipe 18 attached to the pump attaching / detaching device 15. It is like that. The bent tube 18 is bent at a substantially right angle between one end 18a that opens in the horizontal direction and the other end 18b that opens upward. The other end 18b of the curved pipe 18 is connected to a lower end 14a of a straight discharge pipe 14 installed substantially vertically. The upper end of the discharge pipe 14 passes through the side wall 10b and communicates with the outside of the manhole 10. Yes. On the other hand, the manhole 10 is provided with a sewage inflow pipe 11 that communicates from the outside of the manhole 10 and opens into the manhole 10.

  In the manhole pump device 100, when sewage (sewage) flows into the manhole 10 from the sewage inflow pipe 11 and accumulates to a predetermined water level, a water level meter (not shown) detects this, whereby the operation of the pump 30 is performed. The sewage in the manhole 10 is sucked up and this sewage is pumped out of the manhole 10 through the discharge pipe 14.

  In the manhole pump device 100, various foreign matters including solid matter are mixed in the sewage flowing into the manhole 10 from the sewage inflow pipe 11. For this reason, the sewage mixed with foreign matter has been sucked into the pump 30, and troubles such as the accident of blockage of the pump 30 and the operation of the overcurrent protection device due to the entanglement of foreign matter inside the pump 30 have occurred. Since the manhole pump device 100 is used for the pumping of sewage such as domestic wastewater, the stoppage of the function may have a great influence on the life of the residents. There is a sanitary problem because the worker enters the manhole 10 to carry out. For this reason, it is necessary to take measures to prevent the pump 30 from being blocked by foreign matter in the manhole pump device 100.

  Therefore, in the conventional manhole pump device 100, a pump having a structure with a relatively low possibility of blockage is used as the pump 30. FIG. 2 is a view showing a structural example of a vortex pump 30-1 used in the conventional manhole pump device 100. As shown in FIG. In the vortex pump 30-1, a casing (pump casing) 34 is installed at a lower portion of a main body 35 in which the electric motor 33 is accommodated, and an impeller 37 attached to a rotating shaft 36 of the electric motor 33 is disposed in the casing 34. ing. A suction port 31 is provided at the lower end of the casing 34, a discharge port 32 is provided at the side, and a large gap 34 a is formed below the impeller 37 of the casing 34. As a result, even if sewage containing foreign matter having a relatively large diameter is sucked from the suction port 31 and enters the casing 34, the foreign matter does not collide with or get entangled with the impeller 37, and passes through the gap 34a. It is discharged from the outlet 32. Therefore, an obstruction accident is unlikely to occur.

  Generally, a so-called filth pump (a pump used for sewage containing a foreign substance having a relatively large diameter) is 70% or more with respect to the diameter of the discharge port of the pump, like the vortex pump 30-1. A pump having a structure in which foreign matter having a diameter of 1 mm is not blocked even when it passes through the casing is used. On the other hand, for so-called general sewage or miscellaneous drainage pumps (pumps used for sewage containing no relatively large foreign matter), foreign matter having a diameter of 50% or less with respect to the diameter of the discharge port of the pump. Otherwise, a pump having a structure that cannot pass through the casing is also used. In the conventional manhole pump device 100, foreign matters having large diameters are included in the sewage, so the above-described so-called sewage pump must be installed, and a pump for general drainage or miscellaneous drainage can be installed. There wasn't.

  However, so-called filth pumps such as the vortex pump 30-1 are designed with an emphasis on the foreign substance passage performance, so that the pump efficiency is greatly inferior to that of a general drainage pump. Therefore, in order to exhibit the same level of pumping performance as the general drainage pump with the vortex pump 30-1, it is necessary to employ a motor with a larger output, and the installation cost of the manhole pump device 100 increases. . In addition, a motor with a large output consumes a large amount of power and the operating cost increases.

On the other hand, as another example of a conventional manhole pump device, there is one in which a residue separation tank is provided in a manhole for the purpose of removing foreign matters contained in sewage flowing into the pump in advance in order to prevent a pump clogging accident ( Patent Document 2). According to this type of manhole pump device, foreign matter (sediment) having a large diameter contained in the sewage is removed in the residue separation tank and does not flow into the manhole. Therefore, the pump efficiency is higher than that of the vortex pump 30-1. A good general drainage pump can be installed. However, in this case, since the residue separation tank must be installed in the manhole, the manhole pump device is large, the structure thereof becomes complicated, and the installation cost increases. In addition, when the inside of the manhole is narrow, it may not be possible to install a residue separation tank.
Japanese Patent Laid-Open No. 11-132198 JP 2004-332365 A

  SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and an object of the present invention is to provide a manhole capable of effectively preventing a pump clogging accident due to a foreign object with a simple structure and installing a small pump having excellent pumping performance. It is providing the pump apparatus and its operating method.

  In order to solve the above-mentioned problem, the invention according to claim 1 of the present application includes a manhole, a sewage inflow pipe for allowing sewage to flow into the manhole, and a pump for sucking up the sewage in the manhole and transferring it to the outside of the manhole. The manhole pump device is equipped with a strainer that passes the sewage flowing from the sewage inflow pipe and captures foreign matter in the sewage, and the strainer is backwashed by pumping water to remove the trapped foreign matter. It is characterized by comprising.

  The invention according to claim 2 of the present application is the manhole pump device according to claim 1, wherein one end of the strainer communicates with the sewage inflow pipe via a check valve, and the other end of the pump discharges from the pump. The sewage flowing in from the sewage inflow pipe passes through the strainer, flows into the pump from the discharge part of the pump, and flows out from the suction part of the pump into the manhole. It is characterized by that.

  The invention according to claim 3 of the present application is the manhole pump device according to claim 2, wherein a branch portion is provided in a pipe connecting the check valve and the strainer, and the strainer passes through the branch portion. A discharge pipe for sending the discharge water of the pump out of the manhole is connected.

  According to a fourth aspect of the present invention, in the manhole pump device according to any one of the first to third aspects, the diameter of a foreign substance that can pass through the pump is 50% of the discharge port diameter. A pump having the following diameter is installed.

  Invention of Claim 5 of this application is the operation | movement of the manhole pump apparatus provided with the manhole, the sewage inflow pipe | tube which flows in sewage in the said manhole, and the pump which sucks up the sewage in the said manhole and transfers it out of the manhole In the method, a strainer is provided, and the sewage from the sewage inflow pipe is passed through the strainer to catch foreign matter in the sewage, and then the sewage is caused to flow into the manhole. When the pressure reaches a predetermined level or more, the pump is operated, and the strainer is back-washed by pumping water to remove foreign matter captured by the strainer.

  The invention according to claim 6 of the present application is the operation method of the manhole pump device according to claim 5, wherein after passing the sewage from the sewage inflow pipe through the strainer, the inside of the manhole via the pump It is made to flow in.

  According to the invention described in claim 1 of the present application, since the strainer that passes the sewage flowing from the sewage inflow pipe and captures the foreign matter in the sewage is provided, the sewage flowing into the manhole with a simple configuration is provided. It is possible to prevent the foreign matter contained in the gas from entering the manhole and prevent the pump from sucking the foreign matter and blocking it. In addition, the strainer is backwashed by pumping water to remove the trapped foreign matter, so that the strainer can be washed with the discharged water every time the pump is operated. Therefore, it is possible to effectively remove foreign matter adhering to the strainer and prevent clogging without maintenance, so the strainer's foreign matter removal function can be maintained over a long period of time. Time and effort is reduced.

  Further, according to the invention described in claim 1 of the present application, foreign matter contained in the sewage flowing into the manhole can be removed with a strainer to prevent the foreign matter from flowing into the manhole. Pumps other than pumps designed with emphasis on prevention can be installed, and as such pumps, small pumps with relatively small electric motors can be installed with good pump efficiency. Installation costs and operation costs can be reduced.

  According to the invention described in claim 2 of the present application, one end of the strainer communicates with the sewage inflow pipe via the check valve, and the other end communicates with the discharge part of the pump. The sewage that passes through the strainer flows into the pump from the discharge part of the pump, and flows out into the manhole from the suction part of the pump. While the sewage from the inflow pipe flows into the manhole via the strainer and the pump, the pump drainage is passed through the strainer in the opposite direction to the sewage flowing from the sewage inflow pipe during the pump operation. A manhole pump device capable of backwashing can be provided.

  According to invention of Claim 3 of this application, the branch part is provided in piping which connects a non-return valve and a strainer, The discharge piping which sends the discharge water of the pump which passed the strainer to the branch part out of a manhole is provided to this branch part. Because it is connected, it has a simple structure and a small installation space. When the pump is stopped, the sewage from the sewage inflow pipe flows into the manhole via the strainer and the pump. The strainer is backwashed by passing it through the strainer in the opposite direction to the sewage flowing in from the sewage inflow pipe, and the discharge water of this pump can be sent out of the manhole through the discharge pipe without flowing back to the sewage inflow pipe. A possible manhole pump device can be provided.

  According to the invention described in claim 4 of the present application, since a pump having a diameter of foreign matter that can pass through the inside thereof is set to be 50% or less of the discharge port diameter, Since a small pump with a small electric motor and good pump efficiency can be installed, it is possible to reduce the installation cost and operation cost of the manhole pump device.

  According to the invention described in claim 5 of the present application, in the operation method of the manhole pump device, after the sewage from the sewage inflow pipe is passed through the strainer to catch foreign matter in the sewage, the sewage flows into the manhole. When the water level of the sewage in the manhole reaches a predetermined level or more, the pump is operated and the strainer is backwashed by pumping the pump to remove the foreign matter captured by the strainer. Foreign matter contained in the sewage can be removed, and the pump can be prevented from sucking and blocking the foreign matter. Moreover, since the strainer is backwashed by pumping and removing the trapped foreign matter, the strainer can be washed with the discharged water every time the pump is operated. Therefore, the foreign matter adhering to the strainer can be effectively removed and the clogging can be prevented, so that the foreign matter removing function of the strainer can be maintained for a long period of time, and the labor of maintenance of the manhole pump device is reduced.

  According to the invention described in claim 6 of the present application, since the sewage from the sewage inflow pipe passes through the strainer and then flows into the manhole via the pump, the configuration of the manhole pump device is simple and small. It can be installed in a space.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the following embodiments, the same reference numerals are given to portions common to the conventional example, and detailed description of the portions is omitted.
[First Embodiment]
FIG. 3 is a schematic sectional side view of the manhole pump device according to the first embodiment of the present invention. In the manhole pump device 1 shown in the figure, a pump 30 is installed at the bottom 10c of the manhole 10, and a connecting pipe 19 is attached to a curved pipe 18 connected to a discharge port 32 of the pump 30. Is connected to the strainer 20. Although the inside of the strainer 20 is not illustrated, the strainer 20 has a configuration in which a mesh member for capturing foreign matter and filtering sewage is installed in the cross section of the flow path in the pipe, and the sewage flowing from the sewage inflow pipe 22 described below ( When the sewage passes through the mesh member of the strainer 20, foreign matter is caught and captured. If the strainer 20 is provided with a hand hole (not shown) for inspection and parts replacement, maintenance work is facilitated and the time can be shortened.

  The strainer 20 is connected to the lower end of a straight discharge pipe 21 installed substantially vertically. The upper end of the discharge pipe 21 passes through the side wall 10 b and communicates with the outside of the manhole 10. On the other hand, a sewage inflow pipe 22 communicating from the outside of the manhole 10 is installed in the manhole 10, and a check valve 23 is installed at the outflow side end 22 a of the sewage inflow pipe 22. The check valve 23 allows sewage to flow in the direction from the sewage inflow pipe 22 into the manhole 10, but in the opposite direction, that is, for sewage to flow into the sewage inflow pipe 22 from the manhole 10, The valve is configured to close by the pressure of sewage. For the check valve 23, it is preferable to use a ball-shaped valve body that is safe against blocking of foreign matter. Further, a pipe 24 is connected to the check valve 23, the pipe 24 is connected to a branch portion 25 provided in the middle of the discharge pipe 21, and one end of the check valve 23 and the discharge pipe 21 are connected in communication. Yes.

  That is, in this manhole pump device 1, one end 20 b of the strainer 20 is connected to the sewage inflow pipe 22 via the check valve 23, and the other end 20 a is connected via the pipe 19 and the curved pipe 18. It is connected to a discharge port (discharge unit) 32 of the pump 30. A check valve 23 is installed between the sewage inflow pipe 22 and the strainer 20, and a branch portion 25 is provided in the pipe 24 and the discharge pipe 21 between the check valve 23 and the strainer 20. A pipe 24 communicating with the stop valve 23 and a discharge pipe 21 are branched.

  On the other hand, a water level sensor 29 for detecting the water level in the manhole 10 is installed on the upper surface of the pump mount 13 in the manhole 10. The water level sensor 29 used here generally includes a piezoresistive effect type or capacitance type pressure sensor, which has a function of detecting water pressure and converting it into an electrical signal.

  Next, the operation procedure of the manhole pump device 1 will be described. First, sewage flows from the sewage inflow pipe 22 into the manhole 10 without operating the pump 30. The inflowing sewage passes through the check valve 23, goes down the discharge pipe 21 via the branch portion 25 provided at the tip of the pipe 24, and passes through the strainer 20 downward. When the sewage passes through the strainer 20, foreign matter contained in the sewage is caught by the mesh member and collected. The sewage that has passed through the strainer 20 flows into the pump 30 from the discharge port 32 of the pump 30 through the pipe 19 and the curved pipe 18, flows out of the suction port (suction part) 31 of the pump 30, and accumulates in the manhole 10. .

  When dirty water accumulates in the manhole 10 and the output of the water level sensor 29 reaches a preset pump start water level, the pump 30 is started to start pumping. By the operation of the pump 30, sewage in the manhole 10 is sucked from the suction port 31 and discharged from the discharge port 32. The sewage discharged from the discharge port 32 passes through the strainer 20 upward from below through the curved pipe 18 and the pipe 19. At this time, the sewage passing through the strainer 20 (discharged water from the pump 30) passes in the direction opposite to the direction in which the sewage flowing from the sewage inflow pipe 22 passes. Thus, when the discharge water of the pump 30 passes through the strainer 20, the strainer 20 is backwashed by pumping of the pump 30, and the solid or fibrous foreign matter adhering to the mesh member is washed away and removed. Therefore, clogging of the strainer 20 can be effectively prevented. The discharge water of the pump 30 that has passed through the strainer 20 rises up the discharge pipe 21 and is discharged out of the manhole 10 from its upper end. At this time, a part of the sewage rising up the discharge pipe 21 tries to flow into the sewage inflow pipe 22 from the branch portion 25, but the check valve 23 is closed by the sewage water pressure (discharge water pressure of the pump 30). There is no backflow into the sewage inflow pipe 22.

  As described above, the manhole pump device 1 includes the strainer 20 that passes the sewage flowing from the sewage inflow pipe 22 and captures the foreign matter, so that the foreign matter contained in the sewage flowing into the manhole 10 can be removed with a simple configuration. The foreign matter can be prevented from flowing into the manhole 10 by being removed, and the blockage of the pump 30 by the foreign matter can be prevented. In addition, the foreign matter captured by the strainer 20 is removed by passing the discharge water of the pump 30 in the direction opposite to the direction in which the sewage flowing from the sewage inflow pipe 22 is passed through the strainer 20 to prevent clogging. Since it comprised, the strainer 20 can be wash | cleaned with the discharge water, whenever the pump 30 is drive | operated. Therefore, since the clogging of the strainer 20 can be prevented without performing maintenance work, the foreign matter removing function of the strainer 20 can be maintained over a long period of time, and the maintenance work of the manhole pump device 1 is reduced.

  In addition, since one end 20b of the strainer 20 is communicated with the sewage inflow pipe 22 and the other end 20a is communicated with the discharge port 32 of the pump 30, the pump 30 can be configured with a simple configuration and a small installation space. At the time of stoppage, the sewage from the sewage inflow pipe 22 is caused to flow into the manhole 10 via the strainer 20 and the pump 30, while the discharge water of the pump 30 is discharged from the sewage inflow pipe 22 during the operation of the pump 30. Can pass through the strainer 20 in the opposite direction.

  Further, a check valve 23 is installed between the sewage inflow pipe 22 and the strainer 20, and a branch portion 25 is provided in the pipe 24 and the discharge pipe 21 that connect the check valve 23 and the strainer 20. 24 and the discharge pipe 21 are branched, and with a simple configuration and a small installation space, the discharge water of the pump 30 that has passed through the strainer 20 does not flow back to the sewage inflow pipe 22 and flows outside the manhole 10 through the discharge pipe 21. Can be sent to.

  In the manhole pump device 1, foreign matter contained in the sewage flowing into the manhole 10 can be removed by the strainer 20, so there is no possibility that sewage containing foreign matter having a large diameter is sucked into the pump 30. Therefore, it is possible to use the so-called general wastewater or miscellaneous drainage pump as the pump 30. FIG. 4 is a schematic sectional side view of a non-clog pump 30-2 used in the manhole pump device 1. The non-clog type pump 30-2 is configured such that the size of the impeller 37-2 is larger than that of the impeller 37 of the vortex pump 30-1 shown in FIG. 3, and the sewage in the casing 34-2 passes therethrough. The space is small, and almost all of the sucked sewage passes through the impeller 37-2. Therefore, the pumping performance and pump efficiency are better than those of the vortex pump 30-1. However, since there is almost no gap 34a below the impeller 37-2 in the casing 34 due to its structure, it is not possible to pass sewage containing foreign substances having a large diameter like the vortex pump 30-1, so-called. Unocclusion is slightly inferior.

  FIG. 5 is a graph showing performance curves of the vortex pump 30-1 and the non-clog pump 30-2 having the same output. As shown in the figure, at the same output, the non-clog pump 30-2 is superior in pumping performance and pump output to the vortex pump 30-1. Therefore, the non-clog pump 30-2 having the same level of pumping performance as the vortex pump 30-1 only needs to have an electric motor with a smaller output than the vortex pump 30-1. As described above, the manhole pump device 1 according to the present invention is a small pump having a small output and a high pump efficiency as compared with the conventional manhole pump device 100 in which the vortex pump 30-1 is installed. Since it can be installed, the installation cost of the equipment can be reduced, and the operation cost can be reduced by reducing the power consumption.

  As described above, in the manhole pump device 1, foreign substances having a relatively large diameter contained in the sewage flowing into the manhole 10 can be removed by the strainer 20, so that the pump 30 has a diameter of 50% or less with respect to the diameter of the discharge port 32. It may be a general drainage or miscellaneous drainage pump having a structure in which it cannot pass through the casing unless it has a size of foreign matter. Since such a pump is a small pump designed with an emphasis on higher efficiency than the ability to pass foreign matter, like the non-clog type pump 30-2, the installation of the manhole pump device 1 Costs and operating costs can be reduced.

[Second Embodiment]
Next, a manhole pump device according to a second embodiment of the present invention will be described. In the drawings and the description thereof according to the present embodiment, the same reference numerals are given to the components common to the first embodiment. Note that items other than those described below and portions other than those illustrated are the same as those in the first embodiment. The same applies to other embodiments below. FIG. 5 is a schematic diagram showing a configuration of a manhole pump device 1-2 according to the second embodiment of the present invention. This embodiment is different from the first embodiment in that two pumps 30 a and 30 b are installed in the manhole 10. That is, on the pump mounting base 13 in the first embodiment shown in FIG. 5, two pumps 30a and 30b having the same configuration as the pump 30 each having the pump attaching / detaching device 15 and the guide pipe 16 are provided on the paper surface of FIG. The two pumps 30a and 30b are installed on the front side and the rear side at appropriate intervals, and the inside of the manhole 10 can be moved up and down by the guide pipes 16 respectively. As shown in FIG. 6, the pipe 26 a and the pipe 26 b connected to the discharge ports 32 a and 32 b of these two pumps 30 a and 30 b merge and are connected to a single pipe 27. One strainer 20 is installed. Thus, the manhole pump apparatus 1-2 of this embodiment is the structure which shares the one strainer 20 with the two pumps 30a and 30b. Valves 28a and 28b are attached to the respective pipes 26a and 26b, and pumps 30a and 30b through which sewage flows in and out can be selected by opening and closing the valves 28a and 28b.

  In the manhole pump device 1-2, the sewage flowing in from the sewage inflow pipe 22 passes through the strainer 20 through the check valve 23 and the branch portion 25, as in the first embodiment. The sewage that has passed through the strainer 20 flows into the pipe 26a or 26b, passes through the pump 30a or 30b, and flows into the manhole 10. At this time, if any one of the valves 28a and 28b is closed, the sewage can flow into only one of the pumps 30a and 30b. On the other hand, when the water level sensor 29 (see FIG. 3) detects the pump start water level, either the pump 30a or 30b is operated to suck up the sewage accumulated in the manhole 10. As the discharge water from the pump 30a or 30b enters the pipe 27 through the pipe 26a or 26b and passes through the strainer 20, the foreign matter adhering to the strainer 20 is removed as in the first embodiment. Clogging is prevented. The discharge water of the pump 30a or 30b that has passed through the strainer 20 rises up the discharge pipe 21 and is discharged out of the manhole 10. Here, it is also possible to simultaneously drive both pumps 30a and 30b to suck up the sewage in the manhole 10.

[Third Embodiment]
FIG. 7 is a schematic diagram showing a configuration of a manhole pump device 1-3 according to the third embodiment of the present invention. This embodiment is different from the second embodiment in that strainers 20a and 20b are installed in the pipes 26a and 26b connected to the pumps 30a and 30b, respectively. That is, in the second embodiment, one strainer 20 is shared by the two pumps 30a and 30b, but in this embodiment, the strainers 20a and 20b are installed for the respective pumps 30a and 30b. . When various kinds of equipment are installed in the narrow manhole 10, the strainers 20a and 20b are provided for each of the pumps 30a and 30b as in this embodiment, so that the smaller strainers are distributed and arranged. This is because it may be easy to arrange the equipment.

  In the manhole pump device of each of the above embodiments, the discharge water of the pump 30 always passes through the strainer 20 by connecting the discharge port 32 of the pump 30 to the one end 20a of the strainer 20 via the pipe 19 and the curved pipe 18. Although it was comprised so that it might be sent out of the manhole 10, if the manhole pump apparatus concerning this invention was comprised so that the strainer 20 might be backwashed with the pumping (discharge water) of the pump 30, discharge of the pump 30 The water may not always be configured to pass through the strainer 20. For example, although not shown, a branch pipe and a flow path are connected to a pipe communicating the end 20 a of the strainer 20 and the discharge port 32 of the pump 30. By installing a switching means (switching valve), a flow path that sends the discharge water of the pump 30 directly out of the manhole 10 through the branch pipe without passing through the strainer 20 is separated. It may be provided. In addition, the pipe connecting the end 20a of the strainer 20 and the discharge port 32 of the pump 30 is provided with a branch pipe whose one end opens into the manhole 10 and a flow path switching means (switching valve), so that sewage flows into the pipe. It is also possible to configure so that the sewage flowing from the pipe 22 passes through the strainer 20 and then flows directly into the manhole 10 through this branch pipe without flowing into the pump 30.

  Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications can be made within the scope of the technical idea described in the claims and the specification and drawings. Is possible. It should be noted that any shape, structure, and material not directly described in the specification and drawings are within the scope of the technical idea of the present invention as long as the effects and advantages of the present invention are exhibited.

It is a schematic sectional side view of the conventional manhole pump apparatus. It is a schematic sectional side view of a vortex pump. It is a schematic sectional side view of the manhole pump apparatus concerning 1st Embodiment of this invention. It is a schematic sectional side view of a non-clog type pump. It is a graph which shows the performance curve of a vortex type pump and a non-clog type pump. It is a schematic diagram which shows the structure of the manhole pump apparatus concerning 2nd Embodiment of this invention. It is a schematic diagram which shows the structure of the manhole pump apparatus concerning 3rd Embodiment of this invention.

Explanation of symbols

1-1-3 Manhole pump device 10 Manhole 11 Sewage inflow pipe 12 Lid 13 Pump mount 14 Discharge pipe 15 Pump attachment / detachment device 16 Guide pipe 17 Suspension means 18 Curved pipe 19 Pipe 20 Strainer 21 Discharge pipe 22 Sewage inflow pipe 23 Reverse Stop valve 24 Piping 25 Branch portion 26a Piping 26b Piping 27 Piping 28a Valve 28b Valve 29 Water level sensor 30 Pump 30-1 Non-clog type pump 30-2 Vortex type pump 31 Suction port 32 Discharge port 33 Electric motor 34 Casing 34-2 Casing 34a Gap 35 Main body 36 Rotating shaft 37 Impeller 37-2 Impeller

Claims (6)

In a manhole pump device comprising a manhole, a sewage inflow pipe for flowing sewage into the manhole, and a pump for sucking up the sewage in the manhole and transferring it to the outside of the manhole,
Equipped with a strainer that passes the sewage flowing from the sewage inflow pipe and captures foreign matter in the sewage,
The manhole pump device characterized in that the strainer is backwashed by pumping of the pump to remove the trapped foreign matter. In the manhole pump device according to claim 1,
One end of the strainer communicates with the sewage inflow pipe via a check valve, the other end communicates with the discharge part of the pump, and sewage flowing from the sewage inflow pipe passes through the strainer. A manhole pump device configured to flow into the pump from a discharge portion of the pump and to flow into the manhole from a suction portion of the pump. In the manhole pump device according to claim 2,
A branch part is provided in a pipe connecting the check valve and the strainer, and a discharge pipe for sending the discharge water of the pump that has passed through the strainer to the outside of the manhole is connected to the branch part. Manhole pump device. In the manhole pump device according to any one of claims 1 to 3,
A manhole pump device characterized in that a pump having a diameter of a foreign substance that can pass through the inside of the pump is 50% or less of a discharge port diameter. In the operation method of the manhole pump device comprising a manhole, a sewage inflow pipe for allowing sewage to flow into the manhole, and a pump for sucking up the sewage in the manhole and transferring it to the outside of the manhole,
Equipped with strainers,
After the sewage from the sewage inflow pipe passes through the strainer and captures foreign matter in the sewage, the sewage flows into the manhole, and when the water level in the manhole reaches a predetermined level or more, A method for operating a manhole pump device, comprising: operating a pump; backwashing the strainer by pumping the pump to remove foreign matter captured by the strainer. In the operation method of the manhole pump device according to claim 5,
A method for operating a manhole pump device, wherein sewage from the sewage inflow pipe passes through the strainer and then flows into the manhole via the pump.

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