JP2018090971A - Pump system and odor stop type drainage equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pump system capable of preventing a pit from being contaminated by drainage which may remain in a casing and/or an impeller of a pump.SOLUTION: A pump system 10 includes: a pump 20; and a suction piping 23 which is connected to a suction port 64 of the pump 20. The suction piping 23 is connected to the suction port 64 of the pump 20 at one end, and the other end is branched to a branch piping 72 and a branch piping 70.SELECTED DRAWING: Figure 1

Description

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

  Pumps include submersible pumps and land pumps. The submersible pump is a pump that can be operated in a liquid such as water. Some submersible pumps can be operated in the air. The submersible pump that can be operated in the air is a pump that can be operated even if the motor unit of the submersible pump is not immersed in the liquid. A land pump is a pump that cannot be operated in a liquid such as water. The land pump cannot be used in a place where the motor unit is immersed in the liquid because the motor unit is not airtight with respect to the liquid.

  Submersible pumps include submersible pumps for sewage treatment installed inside or outside a sewage tank (sewage pit). The submersible pump arranged outside the sewage pit is called an outside tank sewage pump. The outside tank type sewage pump includes an outside tank type sewage pump disposed in a dry pit. Here, the dry pit is a pit that is waterproof so that it is safe even if sewage overflows.

  Another type of dry pit is the building pit. The building pit is a drainage tank installed in the basement of the building and installed at a position lower than the public sewer. The sewage used in the building flows down naturally into the sewage tank in the building pit (drainage tank). The sewage pump pumps the sewage in the sewage tank to the public sewer.

  The sewage pump can be maintained by lifting the sewage pump from the building pit to the underground part of the building located above the building pit. However, when the pump is pulled up, the sewage that may remain in the pump casing or impeller may scatter and the building pit may become dirty. When the building pit gets dirty, there are the following problems. When going down to the building pit for maintenance or replacement of the sewage pump, the cleaning company first performs cleaning, and after the safety is secured, the maintenance staff of the pump works in the building pit. For safety and simplification of cleaning work, it is desirable to suppress contamination by sewage as much as possible in the building pit.

  In general, in a facility where sewage, wastewater, river water, or the like is temporarily stored in a water tank and drained by a pump, the liquid may contain dust or filth. Especially in buildings with underground structures, not only sewage generated in the basement, but also sewage generated in the building is temporarily stored in large drainage tanks or sewage tanks (also called pits or building pits) installed underground. May be stored. Since these temporarily stored liquids are located below the public sewer pipe, they are pumped up to the sewage sewage by a pump installed in the pit and drained to the public sewage pipe through the sewage sewage pipe.

  FIG. 10 is a diagram schematically showing a drainage facility formed in the underground portion of the building 500. As shown in FIG. 10, the basement portion C of the building 500 may be located below the public sewer pipe 180. Conventionally, the sewage and miscellaneous drainage (hereinafter referred to as sewage etc.) generated in the basement portion C and the sewage generated in the building 500 are transferred to a large drainage tank 85 installed further down through the inflow pipe 81. Temporarily stored. Thereafter, the sewage and the like are pumped up to the sewage basin 91 by a drainage pump 190 installed in the drainage tank 85 and drained to the public sewer pipe 180 through the sewage basin 93. In addition, you may drain the waste water etc. which generate | occur | produce in the 1st floor or more part of the building 500 directly to the waste water 91 by a natural flow.

  In such a facility, the pump 190 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 remains at the bottom of the drainage tank 85 for a long time, the decay will progress and a bad odor will be generated from the manhole etc. when discharged into the public sewer pipe 180 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. 15, the bottom plate 87 of the drainage tank 85 is provided with a gradient descending toward the pump 190, or the recess 89 is provided in the bottom plate 87 where the pump 190 is installed. ing. Further, by improving the operation method of the pump 190, for example, after the pump 190 is operated to the pump-off water level WL2, the operation of the pump 190 is continued for a predetermined time so as to reduce the amount of remaining sewage as much as possible. ing.

  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, a malodor prevention type drainage system has been proposed in which a small cylindrical water tank (barrel) or the like is disposed in a large water tank and a pump is employed in the small water tank (for example, Patent Document 1).

  In the case of a pump for water supply, if the water leaks from the water tank or the water pump, there is a possibility that the leaked water will infiltrate the building or the like.

Japanese Patent No. 4455742

  One form of the present invention is made to solve such problems, and its purpose is a place where the pump is installed by water that may remain in the casing or impeller of the pump. It is providing the pump system which can suppress that is contaminated or flooded.

  In order to solve the above-described problem, in the first embodiment, the pump has a suction pipe connected to the suction port of the pump, and one end of the suction pipe is connected to the suction port of the pump. The other end portion is branched into a plurality of branch pipes.

  According to this embodiment, since the other end is branched into a plurality of branch pipes, one of the plurality of branch pipes is a sewage tank in which sewage is accumulated or a pipe through which sewage to be discharged flows. Can be connected. The other one of the plurality of branch pipes can suck and discharge the sewage around the pump without being connected to the sewage tank or the pipe. Thereby, the sewage discharged to the drain pan, pit, etc. due to the desorption of the pump or leakage from the sewage tank or the like can be discharged to the public sewer by the pump. As a result, pit cleaning is unnecessary or simplified.

  The pump is not limited to a sewage pump, and the present invention can be applied to a water pump. In this case, it is possible to reduce inundation into the building due to leakage of water from the water tank or the water pump. In addition, the present invention can be applied to both submersible pumps and land pumps.

  In the second embodiment, the pump can be disposed outside the water tank, and one of the plurality of branch pipes is connected to an outlet of the water tank, and the other of the plurality of branch pipes One has a configuration in which the water tank is not connected to the outlet.

  In the 3rd form, the structure which the valve is provided in the said branch piping which is not connected with the said outflow port of the said water tank is taken.

  In a fourth mode, the valve opens for a predetermined period when the liquid level in the water tank reaches a predetermined height, and the pump sucks through the branch pipe not connected to the outlet. It is configured to do.

  In the fifth embodiment, the drain pan is disposed at the lower portion of the pump, and the drain pan accepts the liquid to be discharged by the pump that may flow out of the pump. .

  In a sixth aspect, the sensor has a sensor for detecting the height of the liquid level received by the drain pan, and a control unit that receives a detection signal from the sensor, A configuration in which an alarm signal indicating that the liquid level of the liquid in the drain pan has exceeded a predetermined value is output based on a detection signal, and / or the pump is operated to drain the drain pan. Is adopted.

  In the seventh embodiment, a discharge pipe connected to the discharge port of the pump, a check valve arranged in the discharge pipe, and the check valve arranged in the discharge port of the pump and the discharge pipe And a cleaning pipe connected between the two and the pump system. In a drainage facility, the environment in which the pump is maintained is not necessarily sanitary depending on the installation environment of the pump and the nature of the drainage handled. Therefore, it is desirable that maintenance of the pump can be performed without human intervention as much as possible. According to the pump system of the fifth embodiment, the pump can be cleaned using the cleaning pipe.

  In an eighth mode, the suction pipe includes a valve body in an opening portion connected to the pump, and the valve body includes the opening portion of the suction pipe in a state where the pump is not connected to the suction pipe. When the pump is connected to the suction pipe, the pump is pushed by the pump to rotate toward the inside of the suction pipe and move to the opening position. According to the pump system of this embodiment, since the opening of the suction pipe is closed by the valve body when the pump is not connected to the suction pipe, leakage of sewage and the like from the suction pipe can be suppressed. Further, when the pump is connected to the suction pipe, the valve body is pushed by the pump and the opening of the suction pipe is opened, so that the drainage by the pump can be performed.

  In a ninth aspect, the apparatus includes a return pipe for returning a part of the drainage from the pump to the bottom of the water tank, and the discharge port of the return pipe has a water flow returned from the return pipe to the bottom of the water tank. A configuration is adopted in which the water tank is disposed in a position and an orientation so as to form a swirling flow toward the outlet through the inner wall surface of the water tank. According to the pump system of the present embodiment, one or more return pipes are attached to the elbow pipe, the discharge pipe, or the pump casing. A swirl flow is created by sending a part of water from an elbow pipe to the water tank, destroying the garbage in the water tank, or hitting the flow against the wall. By sucking in the crushed garbage with the suction pipe, the waste in the water tank is eliminated. The suction pipe and the return pipe may be arranged side by side in the vertical direction, or may be arranged so that their positions are shifted in the horizontal direction when viewed from above.

  In a tenth aspect, the pump includes a pump body and an elbow pipe connected to the pump body, the pump system includes a discharge pipe connected to the elbow pipe, and the pump system includes: The elbow pipe connected to the pump body can be moved up and down without separation, and the discharge pipe is detachably connected to two or more discharge pipes having connecting flanges at both ends. The two or more discharge pipes are mutually connected by a long fastener that is longer than the total length of at least the total length in the longitudinal axis direction of the uppermost discharge pipe and the thickness of the connecting flange of the next discharge pipe. It is configured to be connected.

  The pump system according to this embodiment has the following advantages. When exchanging and maintaining the pump, there is a demand for the pump to be pulled out of the pit and replaced or maintained without the person entering the pit. In order to lift the pump without a person entering the pit, a pump attaching / detaching device may be installed in the pit. The height of the pit maintenance space (e.g., the room above the pit) may not be high enough to pull out a vertically long discharge line with the pump. In such a case, in order to take out the pump from the pit, it is necessary to remove the discharge pipe connected to the pump with a flange and a bolt. Even if a conventional pump attaching / detaching device is used, the worker needs to enter the pit or the barrel. According to the present embodiment, it is possible to greatly reduce the need for an operator to enter and work in a pit or the like.

  According to this embodiment, by removing the uppermost discharge pipe first, it is possible to reduce the total amount of lifting of the remaining discharge pipe and the pump body. Also, it is not necessary to pull up the discharge pipe to the end, and it is possible to easily lift the pump even in a work space with insufficient height by pulling up halfway and gradually separating from the uppermost stage. . Furthermore, since the separation work of the discharge pipe and the fastener can be performed after being pulled up instead of in the pit, workability is improved in each stage.

  The eleventh aspect includes the pump system described above, wherein the pump can discharge sewage, and one of the plurality of branch pipes can discharge the sewage and prevent malodor. It adopts the structure of the odor prevention type drainage system characterized by this.

  In a twelfth aspect, the pump is used in a pump system, and the pump system includes the pump and a suction pipe connected to a suction port of the pump, and the suction pipe has one end. The part is connected to the suction port of the pump, and the other end is branched into a plurality of branch pipes.

FIG. 1 is a diagram illustrating a basic configuration of a pump system 10 according to an embodiment. FIG. 2 is a diagram showing details of the suction pipe 23. FIG. 3 shows a pump system 10 that uses a horizontal pump 60 as the pump 20. FIG. 4 is a diagram schematically showing an overall configuration of a pump system according to another embodiment. FIG. 5 is an enlarged cross-sectional view and a top view showing in detail a portion of the suction pipe connected to the pump according to another embodiment. FIG. 6A is an enlarged cross-sectional view showing in detail a connecting portion between the pump and the suction pipe. FIG. 6B is an enlarged cross-sectional view showing in detail a connecting portion between the pump and the suction pipe. FIG. 7 is a diagram schematically showing an overall configuration of a pump system according to still another embodiment. FIG. 8 is a diagram schematically showing an overall configuration of a pump system according to still another embodiment. FIG. 9 shows a state where the discharge pipe 110 and the discharge pipe 112 are connected to each other. FIG. 10 is a diagram schematically illustrating a drainage facility formed in an underground portion of a building.

  Embodiments of the present invention will be described below with reference to the drawings. In the following embodiments, the same or corresponding members are denoted by the same reference numerals, and redundant description is omitted. FIG. 1 is a diagram illustrating a basic configuration of a pump system 10 according to an embodiment. FIG. 1 shows a form in which the pump system 10 is used for drainage equipment in a basement B of a building such as a building.

  As shown in FIG. 1, the pump system 10 is provided in a pit (building pit) Pi that is a drainage tank installed in a basement portion B of a building (for example, a building). A dirty water tank (water tank) 12 is provided in the pit Pi. The pump system 10 includes a pump 20 connected to the outlet 16 of the sewage tank 12 and a suction pipe 23 connected to a suction port 64 of the pump 20. FIG. 2 shows details of the suction pipe 23. One end 68 of the suction pipe 23 is connected to the suction port 64 of the pump 20. The other end is branched into a plurality of branch pipes.

  The pump 20 is disposed outside the sewage tank 12. One of the plurality of branch pipes is a branch pipe 70 connected to the outlet 16 of the sewage tank 12. Another one of the plurality of branch pipes is a branch pipe 72 that is not connected to the outlet 16 of the sewage tank 12. A check valve 74 is provided in the branch pipe 72 that is not connected to the outlet 16 of the sewage tank 12.

  The pump system 10 has a drain pan 28 disposed at the lower part of the pump 20. The drain pan 28 is capable of receiving liquid accumulated in the sewage tank 12 that may flow out of the pump 20. The drain pan 28 is disposed in at least a part of the lower portion of the sewage tank 12. The drain pan 28 may be disposed in the entire lower portion of the sewage tank 12. The drain pan 28 may be structured to surround the pump 20 with a concrete wall 32. The drain pan 28 may be a steel plate that surrounds the pump 20. The drain pan 28 made of concrete or steel plate may have a box-type structure in which concrete or steel plate is disposed on the entire lower portion of the drain pan 28.

  The branch pipe 72 is a suction pipe for draining the sewage in the drain pan 28. A check valve 74 is provided in the branch pipe 72. When the pump 20 is removed, the sewage leaked from the pump 20 to the drain pan 28 is discharged again by the pump through the branch pipe 72. The discharge by the branch pipe 72 is simultaneously performed when the pump 20 discharges the sewage in the sewage tank 12 through the branch pipe 70. When sewage flows through the branch pipe 70 at a high speed as indicated by an arrow 76, the branch pipe 72 is in a low pressure state. Due to this constant pressure, the sewage leaked into the drain pan 28 is sucked up by the branch pipe 72 in the direction of the arrow 82 and discharged by the pump 20. By discharging the sewage through the branch pipe 72, the cleaning of the pit Pi is unnecessary or simplified. The check valve 74 can prevent sewage in the branch pipe 72 from flowing back to the drain pan 28 when the pump 20 is stopped. Instead of the check valve 74, for example, an electromagnetic valve that is controlled to be closed when the pump 20 is stopped may be used instead of the check valve 74.

  The pump 20 in the embodiment shown in FIG. 1 can be a submersible pump that can be operated even in water. By using an underwater pump that can be operated in water, for example, even when sewage overflows from the sewage tank 12 into the pit Pi and the motor portion Mo of the pump 20 is submerged, the pump operation becomes possible.

  The branch pipe 72 may have a structure that can be detached from the suction pipe 23. Examples of the structure for removing include a structure in which a flange is provided at the ends of the branch pipe 72 and the suction pipe 23 and a structure in which one of the branch pipe 72 and the suction pipe 23 is screwed into the other. However, it is not limited to these structures. By adopting a detachable structure, maintenance can be easily performed when clogging occurs in the branch pipe 72 or when the check valve 74 breaks down. Further, when an operation without using the branch pipe 72 is performed, a suction flange 23 may be closed by attaching a closing flange or a closing cap to the suction pipe 23 instead of the branch pipe 72.

  In the embodiment shown in FIG. 1, 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. As one embodiment, the sewage tank 12 can be a small cylindrical water tank (barrel), for example, or a small water tank formed by combining a plurality of small panel members that can be carried into the pit Pi. It can be. The sewage tank 12 is formed so as to be able to store water commensurate with the inflow of sewage and to have a spare capacity in accordance with the scale of the building and the amount of water used. The sewage tank 12 has an opening (not shown) formed on the upper surface 12c, and the opening is covered with a lid (not shown). An inflow pipe (not shown) is inserted into the sewage tank 12 through the lid. The inflow pipe is piped in the building and allows sewage generated in the building to flow into the sewage tank 12.

  As shown in FIG. 1, an outlet 16 for discharging accumulated sewage and the like is provided at the lower part of the sewage tank 12, and a branch pipe 70 is connected to the outlet 16. As described above, a known pump can be used as the pump 20. As an example, the pump 20 may be 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 to the upper side of the suction pipe 23, so that it is easy to remove the pump from the suction pipe 23.

  The branch pipe 70 and the outlet 16 can be fixed with a bolt or the like, but the connection may be maintained by the weight of the pump 20 and the suction pipe 23 without using a bolt or the like. By connecting the branch pipe 70 and the outlet 16 without using a bolt or the like, the pump 20 can be pulled up and pulled out from the opening of the pit Pi without entering a pit Pi. In order to lift the pump 20 without a person entering the pit Pi, a pump attaching / detaching device 15 is installed in the pit Pi.

  The pump attaching / detaching device 15 is installed in the drain pan 28 and makes the pump 20 attachable / detachable. The pump attaching / detaching device 15 has a guide part 34 standing vertically in the pit Pi, and the guide part 34 is attached to a base 36. A sliding portion 38 that is guided by the guide portion 34 and can be moved up and down is provided in the pump 20. The sliding portion 38 is fixed to the flange of the branch pipe 70.

  The pump 20 is suspended by a suspension means 40 such as a chain, is carried into the pit Pi from the opening, and descends in the pit Pi while being guided by the guide portion 34. The pump 20 descends in the pit Pi until the sliding portion 38 hits the base 36. The outlet 16 is connected to the branch pipe 70 at a position where the sliding portion 38 abuts against the base 36. When such a pump attaching / detaching device 15 is used and bolt fixing is not used, there is a possibility that sewage leaks from the connection portion between the outlet 16 and the branch pipe 70. As a countermeasure against leakage, the sewage in the drain pan 28 is discharged by the branch pipe 72 described above.

  As shown in FIG. 1, a discharge pipe 22 is connected to a discharge port 26 of the pump 20. The upper end of the discharge pipe 22 is connected to a public sewer outside the pit Pi.

  In the embodiment shown in FIG. 1, the pump system 10 includes a water level gauge 44 disposed in the drain pan 28. When sewage (sewage) leaks from the sewage tank 12 or the pump 20 into the drain pan 28 and accumulates to a predetermined water level, the water level gauge 44 detects that the predetermined water level has been reached. A detection signal from the water level gauge 44 is sent via a signal line 44a to a control panel (not shown) which is a control unit outside the pit Pi. When receiving the detection signal, the control panel starts the operation of the pump 20 and sucks up the dirty water in the drain pan 28 from the suction port 78 at the lower part of the pump 20 (that is, at the end of the branch pipe 72). Sucked sewage is pumped to the public sewer through the discharge pipe 22.

  By providing the water level gauge 44, it becomes possible to detect and discharge sewage when sewage overflows from the sewage tank 12 in addition to leakage when the pump 20 is detached, and has the following advantages. For example, it is possible to cope with a case where the water level sensor in the sewage tank 12 fails and the water level at which the pump 20 should be activated cannot be detected. When the water level gauge 44 detects an increase in the water level when the pump 20 is not detached, the sewage may have overflowed from the sewage tank 12. The control panel that has received the detection signal from the water level gauge 44 outputs an alarm signal or activates the pump 20 to start drainage from the sewage tank 12 and the drain pan 28.

  In addition, when sewage overflows from the sewage tank 12 by reducing the height of the sewage tank 12 on the drain pan 28 side or by providing a relief pipe connected from the sewage tank 12 to the drain pan 28, the sewage goes to the drain pan 28. Like that. By discharging the sewage collected in the drain pan 28 by the pump 20, the contamination of the pit Pi can be suppressed.

  The distance 80 between the suction port 78 and the upper surface of the drain pan 28 is preferably short. Since the distance 80 is short, the amount of sewage remaining in the drain pan 28 after the sewage is discharged by the pump 20 is reduced. Moreover, since it is considered that there are few large foreign substances in the sewage leaked into the drain pan 28, it is considered that there is little problem in discharging foreign substances even if the distance 80 is shortened.

  Various types of water level gauges 44 can be used. For example, a water level gauge 44 that has a plurality of detection electrodes and that flows between the electrodes (ground electrode and detection electrode) when the object to be measured (conductive liquid) contacts the electrodes and opens and closes the relay contact can be used. The plurality of detection electrodes have different lengths in the vertical direction, and can detect different water levels. As another type of water level gauge 44, there is one in which a float is arranged in a pipe. A reed switch is placed in the tube, for example, every centimeter. This water level gauge 44 is also called a reed switch type. When a float with a built-in permanent magnet moves up and down in the pipe due to a change in water level, the reed switch corresponding to the water level is energized by magnetic force.

  It is also possible not to provide the water level gauge 44. In this case, when the water level of the sewage tank 12 is lowered and the pump 20 is stopped, the following operation is performed. During operation of the pump 20, the water level sensor in the sewage tank 12 detects that the water level in the sewage tank 12 has fallen and has reached the stop water level. Next, the control panel opens the check valve 74 which is an electromagnetic valve, and the pump 20 is further operated, for example, for 5 seconds. After 5 seconds, the check valve 74 is closed and the pump 20 is stopped. Thereby, the sewage which may exist in the drain pan 28 is discharged. The reason for setting the short time of 5 seconds is that if the time is short, the pump will not cause a problem even if it sucks air, and the amount of sewage in the drain pan 28 is considered to be usually small.

The sewage tank 12 has a discharge part 48 capable of discharging liquid to the drain pan 28 at the upper part of the sewage tank 12. As the structure of the discharge part 48, various structures are possible. For example, the upper surface 12c can be inclined toward the drain pan 28 side. When the sewage overflows from the sewage tank 12, the sewage can be guided into the drain pan 28. As another method, the upper surface 12c is made horizontal without being inclined toward the drain pan 28 as shown in FIG. And as an emission part 48, you may provide an opening or a notch in the uppermost part by the side of the drain pan 28 of side 12b. Furthermore, the discharge part 48 may have a pipe, one end of the pipe may be connected to the opening or notch, and the other end of the pipe may be disposed in the drain pan 28.

  When the sewage overflows from the sewage tank 12, the sewage tank 12 that guides the sewage into the drain pan 28 can immediately detect that the sewage has overflowed from the sewage tank 12. This is because the bottom area of the drain pan 28 is smaller than the bottom area of the entire sewage pit, and the water level in the drain pan 28 rises more easily than the water level of the entire sewage pit. That is, when there is no drain pan 28, the pump provided for discharging the sewage in the sewage pit is not started until the water level of the entire sewage pit rises.

  After the detection signal is output from the water level gauge 44, an alarm may be output from the control panel even if the pump 20 is continuously operated for a certain time or more. At this time, there is a high possibility that the pump 20 is out of order and the sewage overflows from the sewage tank 12 or the detachment of the pump 20 fails and the sewage leaks from the detachable part of the pump 20. At this time, the control panel may output an alarm indicating abnormality. The leakage of sewage from the pump 20 only at the time of attachment / detachment that is not overflowing of the sewage from the sewage tank 12 is leakage of sewage in the pump 20 or in the pipe, and is less than a certain amount. For this reason, an alarm is not continuously output from the water level gauge 44 for a predetermined time or longer.

  FIG. 3 shows another embodiment. FIG. 3 shows a pump system 10 that uses a horizontal pump 60 as the pump 20. When the horizontal pump 60 is used, it is easier to connect the branch pipe 70 to the bottom surface 12a of the sewage tank 12 than the pump 20 that is a vertical pump. Connecting the branch pipe 70 to the bottom surface 12a has the following advantages. First, since sewage is sucked from the bottom surface 12 a, the amount of sewage remaining in the sewage tank 12 is reduced as compared with the case of the pump 20. Since the amount of remaining sewage is reduced, maintenance of the sewage tank 12 is facilitated.

  Secondly, the level of the starting priming water required when starting the horizontal pump 60 (the level of the sewage tank 12) is lower than that of the pump 20. The water level of the priming water needs to be a height at which the impeller 62 of the pump is submerged by the sewage flowing from the sewage tank 12 via the suction pipe 23. When FIG. 1 and FIG. 3 are compared, the water level at which the impeller 62 of the horizontal pump 60 is submerged is lower than the water level at which the impeller 62 of the pump 20 is submerged. Accordingly, the horizontal pump 60 can be activated at a lower level of the water level in the sewage tank 12 than in the case of the pump 20. The sewage below the priming water level in the sewage tank 12 can be considered as sewage that cannot be discharged from the sewage tank 12. In the case of the horizontal pump 60, compared to the case of the pump 20, the amount of sewage that can be effectively stored in the sewage tank 12 increases.

  The present invention is not limited to a sewage pump outside the tank, but can also be applied to a pump for water supply provided outside the tank of a water receiving tank. In this case, it is possible to reduce inundation into the building due to leakage of water from the water tank or the water pump. Further, the present invention is not limited to the outside tank type pump with a drain, but can also be applied to an outside tank type pump without a drain. In this case, there is an effect of reducing contamination in the pit. Further, the present invention is not limited to the outside tank type sewage pump in the building pit, but can also be applied to the outside tank type sewage pump entering the dry pit. In this case, contamination in the dry pit can be reduced.

In FIG. 1, the pump attaching / detaching device 15 is connected to the suction pipe 23, and raises and lowers the suction pipe 23 and the pump 20. However, the pump attaching / detaching device 15 may be connected only to the motor portion Mo. In this case, only the motor part Mo and the impeller 62 are moved up and down. Furthermore, the pump attaching / detaching device 15 may be connected to the casing of the impeller 62 to raise and lower only the motor part Mo and the pump part other than the suction pipe 23.

  Next, another embodiment of the present invention will be described with reference to FIG. In the present embodiment, the pump system 10 is disposed in the discharge pipe 22 connected to the discharge port 26 of the pump 20, the check valve 17 disposed in the discharge pipe 22, and the discharge port 26 and the discharge pipe 22 of the pump 20. And a cleaning pipe 50 connected to the check valve 17.

  As shown in FIG. 4, the pump 20 has a discharge pipe 22 connected to a discharge port 26. The discharge pipe 22 is provided with a backflow prevention valve 17. The backflow prevention valve 17 prevents water from returning from the discharge pipe 22 to the pump 20 side. Note that an opening (manhole) 202 is formed in the pit Pi, and a lid (not shown) is attached to the opening 202. Further, an on-off valve 18 is provided on the downstream side of the check valve 17 in the discharge pipe 22. The on-off valve 18 is used to close the discharge pipe 22 during maintenance of the pump 20 or the like.

  At least a part of the discharge pipe 22 can be a flexible pipe. By using the flexible discharge pipe 22, the pump 20 can be pulled up from the pit Pi while the discharge pipe 22 is connected. As the flexible discharge pipe 22, a bellows pipe, a flexible pipe made of rubber or resin can be used. Alternatively, the discharge pipe 22 may be configured by connecting a plurality of rigid pipes. In this case, when the pump 20 is pulled up from the pit Pi, the pump 20 is pulled up stepwise while removing a plurality of rigid tubes in order.

  As shown in FIG. 4, a cleaning pipe 50 is connected to the discharge pipe 22. One end 50 a of the cleaning pipe 50 is on the upper floor of the pit Pi and can be connected to the fluid source 52. The fluid source 52 is for supplying a liquid such as fresh water and / or a gas such as air. The fluid source 52 is provided with a valve (not shown) for supplying various fluids.

  As shown in FIG. 4, the cleaning pipe 50 includes a branch portion 54, one from the fluid source 52 is connected to the discharge pipe 22, and the other is connected to the sewage tank 12. One end 50 b of the cleaning pipe 50 is connected to the discharge pipe 22. The end 50 b of the cleaning pipe 50 is connected between the discharge port 26 of the pump 20 and the backflow prevention valve 17 of the discharge pipe 22. Therefore, various cleaning fluids can be supplied from the fluid source 52 to the discharge pipe 22 and the pump 20 via the cleaning pipe 50. A backflow prevention valve 56 is provided between the fluid source 52 and the branch portion 54. The backflow prevention valve 56 is a valve for preventing the fluid from flowing from the discharge pipe 22 toward the fluid source 52. The end 50c of the other pipe extending from the branch part 54 of the cleaning pipe 50 is connected to the sewage tank 12. A valve 58 is provided between the branch portion 54 and the end portion 50c. The pipe connected to the sewage tank 12 is mainly used for air venting.

Next, still another embodiment of the present invention will be described with reference to FIGS. FIG. 5 is an enlarged cross-sectional view and a top view showing in detail the portion of the suction pipe 23 connected to the pump 20. As shown in FIG. 5, the suction pipe 23 is fixed to the floor surface of the pit Pi so that the opening 23-1 faces vertically upward. The suction pipe 23 includes a pipe portion 23-2 whose tip portion (not shown) in FIG. 5 is connected to the outlet 16 of the sewage tank 12 and a connection portion 23-3 that is connected to the pump 20. The connecting portion 23-3 has a larger inner diameter than the tube portion 23-2. A cylindrical frame 23-4 that abuts the pump 20 when the suction pipe 23 is connected to the pump 20 is formed at the tip of the connecting portion 23-3. The cylindrical frame 23-4 defines the opening 23-1 of the suction pipe 23. A valve body 23-5 is provided immediately inside the opening 23-1 of the suction pipe 23. The valve body 23-5 can be rotated and moved in the direction of the arrow shown in the drawing around the rotation axis of the hinge portion 23-6. FIG. 5 shows a state in which the valve body 23-5 is in the closed position where the opening 23-1 of the suction pipe 23 is closed. In the example shown in FIG. 5, the valve body 23-5 rotates approximately 90 ° in the clockwise direction to reach the open position. When the valve body 23-5 is in the closed position, the flow of sewage from the suction pipe 23 to the pump 20 is hindered. When the valve body 23-5 is in the open position, sewage is allowed to flow from the suction pipe 23 to the pump 20.

  A sealing member (not shown) such as an O-ring may be provided on the bottom surface portion 23-4a of the cylindrical frame 23-4 that contacts the valve body 23-5 when the valve body 23-5 is in the closed position. Further, when the suction pipe 23 and the pump 20 are connected, a sealing member (not shown) such as an O-ring is also provided on the upper surface portion 23-4b of the cylindrical frame 23-4 so that sewage does not leak from the connection portion. May be provided.

  6A and 6B are enlarged sectional views showing in detail the connecting portion between the pump 20 and the suction pipe 23. FIG. 6A shows a state where the pump 20 is separated from the suction pipe 23. FIG. 6B shows a state where the pump 20 is connected to the suction pipe 23. In the illustrated example, the suction port 20-2 of the pump 20 is provided at the bottom of the pump casing 20-4. At the bottom of the pump casing 20-4, a cylindrical frame 20-3 is formed that contacts the cylindrical frame 23-4 of the suction pipe 23 when the pump 20 is connected to the suction pipe 23. The cylindrical frame 20-3 defines a suction port 20-2 of the pump 20.

  The pump casing 20-4 further includes a rod-shaped protrusion 20-5 that protrudes downward from a part of the cylindrical frame 20-3 in the drawing. As shown in FIG. 6B, when the pump 20 is connected to the suction pipe 23, the rod-like protrusion 20-5 pushes and opens the valve body 23-5 of the suction pipe 23 to the open position. The rod-shaped protrusion 20-5 is located at a position facing the opening 23-1 of the suction pipe 23 when the central axis of the suction port 20-2 of the pump 20 is aligned with the central axis of the opening 23-1 of the suction pipe 23. Is provided. As a result, the tip of the rod-shaped protrusion 20-5 comes into contact with the valve element 23-5 that closes the opening 23-1 of the suction pipe 23 when the pump 20 is brought close to the suction pipe 23. The body 23-5 is pushed open by rotating toward the inside of the suction pipe 23 and moved to the lid opening position. Thus, when the valve body 23-5 moves to the open position, the opening 23-1 of the suction pipe 23 is opened, and the pump 20 can suck sewage from the suction pipe 23.

  Further, when the pump 20 is pulled upward in order to separate the pump 20 from the suction pipe 23, the valve body 23-5 at the open position receives the water pressure of the sewage flowing through the suction pipe 23, and the sewage Attempts to rotate towards the closed position which is the direction of flow (ie in the opposite direction). Therefore, as shown in FIG. 6A, when the pump 20 is pulled up to the point where the tip of the rod-shaped protrusion 20-5 is removed from the opening 23-1 of the suction pipe 23, the valve body 23-5 is in the closed position. After that, the rotation is stopped, and thereafter, the pressure is pressed against the bottom surface portion 23-4a of the cylindrical frame 23-4 of the suction pipe 23 by the water pressure of the sewage in the suction pipe 23 to close the opening 23-1. Thus, when the valve body 23-5 moves to the closed position, the opening 23-1 of the suction pipe 23 is closed and leakage of sewage from the suction pipe 23 is avoided. In order to ensure that the valve body 23-5 is rotated from the open position to the closed position, or the valve body 23-5 is pressed against the bottom surface portion 23-4a of the cylindrical frame 23-4, the valve body 23 An elastic member (for example, a spring) that urges −5 to the closed position may be provided in the hinge portion 23-6.

As described above, the open position is a position obtained by rotating the valve body 23-5 from the closed position (FIG. 5) to the inside of the suction pipe 23 by approximately 90 °. FIG. 6B shows a state in which the valve body 23-5 is in such an open position. In FIG. 6B, the tip of the valve body 23-5 is located outside the hollow portion defined by the inner diameter of the pipe portion 23-2 of the suction pipe 23. Therefore, the flow of the sewage in the suction pipe 23 is not hindered by the valve body 23-5 in the open position. The rod-shaped protrusion 20-5 preferably has a length (projection height) sufficient to rotate the valve body 23-5 to the open position as shown in FIG. 6B. Further, the rod-shaped protrusion 20-5 needs to be provided as close as possible to the hinge portion 23-6 in order to rotate the valve body 23-5 to the open position as shown in FIG. 6B.

Next, still another embodiment of the present invention will be described with reference to FIG. FIG. 7 is a diagram schematically showing an overall configuration of a pump system according to still another embodiment. In this embodiment, the pump system 10 includes a return pipe 84 for returning a part of the drainage from the pump 20 to the bottom 86 of the sewage tank 12. The discharge port 88 of the return pipe 84 is positioned and oriented so that the water flow 90 returned from the return pipe 84 to the bottom 86 of the sewage tank 12 hits the inner wall surface 92 of the sewage tank 12 and forms a swirling flow 94 toward the outlet 16. Placed in. According to the pump system 10 of the present embodiment, one or more return pipes 84 are attached to the elbow pipe 102, the discharge pipe 22, or the casing of the pump. A part of the water supplied from the elbow pipe 102 is sent to the sewage tank 12, the waste 96 in the sewage tank 12 is crushed, or the water flow 90 is hit against the inner wall surface 92 to create a swirling flow 94. By sucking the crushed garbage 96 through the suction pipe 23, the litter in the sewage tank 12 is eliminated. The branch pipe 70 and the return pipe 84 may be arranged side by side as shown in FIG. 7 or may be arranged so that their positions are shifted in the horizontal direction when viewed from above. . In FIG. 7, the floor 100 up to the recess 98 is set obliquely in the sewage tank 12 as a guide for sewage. The recess 98 may not be provided, and the floor 100 may be set flat.

  Next, still another embodiment of the present invention will be described with reference to FIG. FIG. 8 is a diagram schematically showing an overall configuration of a pump system according to still another embodiment. In the present embodiment, the pump 20 includes a pump main body 104 and an elbow pipe 106 connected to the pump main body 104. The pump system 10 includes a discharge pipe 22 connected to an elbow pipe 106. The pump system 10 is configured to be movable up and down without separating the elbow pipe 106 connected to the pump main body 104. The discharge pipe 22 connects two or more discharge pipes having connecting flanges at both ends in a separable manner. In the case of FIG. 8, the discharge pipe 22 includes two discharge pipes 110 and 112. The two discharge pipes 110 and 112 have a length L3 which is longer than the total length of the total length L1 in the longitudinal axis direction of the uppermost discharge pipe 110 and the thickness L2 of the connecting flange 114 of the next-stage discharge pipe 112. They are connected to each other by a scale fastener 116. In FIG. 8, the discharge pipe 110 is shown separated from the discharge pipe 112.

  FIG. 9 shows a state where the discharge pipe 110 and the discharge pipe 112 are connected to each other. The discharge pipe 110 is sandwiched between the discharge pipe 112 and the pipe 118. The flange 120 at both ends of the discharge pipe 110, the flange 122 of the pipe 118, and the connecting flange 114 of the discharge pipe 112 are provided with through holes for passing the fasteners 116. 8 and 9, the fastener 116 is a long screw. The fastener 116 is fixed with a nut 126. The number of fasteners 116 is preferably two or more. Since the head 124 of the fastener 116 is engaged with the connecting flange 114 of the discharge pipe 112 in FIG. 8, the discharge pipe 112 and the pump 20 can be pulled up by the fastener 116.

  According to this embodiment, by removing the uppermost discharge pipe 110 first, the total amount of lifting of the remaining discharge pipe 112 and the pump main body 104 can be reduced. Also, it is not necessary to pull up the discharge pipe 22 to the end, and it is possible to easily lift the pump even in a work space with insufficient height by pulling up to the middle and gradually separating from the uppermost stage. it can. Furthermore, since the separation work of the discharge pipe 22 and the fastener 116 can be performed after being pulled up instead of in the pit, workability is improved at each stage.

In one embodiment of the present invention, the malodor prevention drainage system includes the pump system described above, and the pump is capable of discharging sewage. One of the plurality of branch pipes can discharge sewage. One branch pipe 72 of the plurality of branch pipes can prevent the spread of bad odor generated from the sewage by being able to suck and discharge the sewage.

  As mentioned above, although the example of embodiment of this invention was demonstrated, above-described embodiment of this invention is for making an understanding of this invention easy, and does not limit this invention. The present invention can be changed and improved without departing from the gist thereof, and the present invention naturally includes equivalents thereof. In addition, any combination or omission of each constituent element described in the claims and the specification is possible within a range where at least a part of the above-described problems can be solved or a range where at least a part of the effect is achieved. It is.

10 Pump System 20 Pump 23 Suction Piping 64 Suction Port 70 Branch Piping 72 Branch Piping

Claims (12)

A pump,
A suction pipe connected to the suction port of the pump;
One end of the suction pipe is connected to the suction port of the pump, and the other end is branched into a plurality of branch pipes. The pump can be arranged outside the aquarium,
One of the plurality of branch pipes is connected to an outlet of the water tank,
The pump system according to claim 1, wherein the other one of the plurality of branch pipes is not connected to the outlet of the water tank.   The pump system according to claim 2, wherein a valve is provided in the branch pipe that is not connected to the outlet of the water tank.   The valve is opened for a predetermined period when the liquid level in the water tank reaches a predetermined height, and the pump performs suction through the branch pipe not connected to the outlet. The pump system according to claim 3. Having a drain pan located at the bottom of the pump;
The pump system according to any one of claims 1 to 4, wherein the drain pan is capable of receiving liquid to be discharged by the pump that may flow out of the pump. A sensor for detecting the level of the liquid level received by the drain pan;
A control unit that receives a detection signal from the sensor;
The control unit outputs an alarm signal indicating that the liquid level of the liquid in the drain pan exceeds a predetermined value based on the detection signal, and / or operates the pump, and 6. The pump system according to claim 5, wherein the drain system is drained from a drain pan. (Comment BPU-18.)
A discharge pipe connected to a discharge port of the pump;
A check valve disposed in the discharge pipe;
A cleaning pipe connected between the discharge port of the pump and the check valve disposed in the discharge pipe;
The pump system according to any one of claims 1 to 6, characterized by comprising: The suction pipe includes a valve body at an opening connected to the pump,
The valve body is in a closed position for closing the opening of the suction pipe when the pump is not connected to the suction pipe, and is pushed by the pump when the pump is connected to the suction pipe. The pump system according to claim 1, wherein the pump system rotates toward the inside of the suction pipe and moves to an open lid position. A return pipe for returning a part of the drainage from the pump to the bottom of the water tank;
The discharge port of the return pipe is disposed at a position and orientation such that the water flow returned from the return pipe to the bottom of the water tank hits the inner wall surface of the water tank and forms a swirling flow toward the outlet. 9. A pump system according to any one of the preceding claims, characterized in that it is characterized in that The pump includes a pump main body and an elbow pipe connected to the pump main body, the pump system includes a discharge pipe connected to the elbow pipe,
The pump system is configured to be movable up and down without separating an elbow pipe connected to the pump body,
The discharge pipe is detachably connected to two or more discharge pipes having connecting flanges at both ends, and the two or more discharge pipes have at least a total length in the longitudinal axis direction of the uppermost discharge pipe. The pump according to any one of claims 1 to 6, wherein the pumps are connected to each other by a fastener that is longer than the total length of the connecting flange of the discharge pipe in the next stage. system. The pump system according to any one of claims 1 to 10, wherein the pump is capable of discharging sewage,
One of the plurality of branch pipes is capable of discharging the sewage and preventing malodors. A pump used in a pump system,
The pump system
The pump;
A suction pipe connected to the suction port of the pump;
One end of the suction pipe is connected to the suction port of the pump, and the other end is branched into a plurality of branch pipes.

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