JP2013040596A - Pump system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pump system in which a plurality of pumps can be driven impartially with a simple constitution.SOLUTION: An air vent valve 26 is connected to a suitable portion of a lifting pipe 15 of each of a plurality of pump units 11 and an advance setting valve 27, a water level regulating valve 28 for starting a pumping-up operation, and a check valve 29 are connected to the air vent valve 26 in parallel. The advance setting valve 27 of the pump unit 11 to be operated first is opened and other advance setting valves are closed. The set pressure of the water level regulating valve 28 for starting the pumping-up operation is regulated to regulate the air pressure in a pump 14. Therefore, if the water level in a water suction tank 12 rises, the water level can be made different since the pumping-up operation of each pump unit 11 having different capacity is started. Accordingly, the order to start the pumping-up operation of each pump unit can be set arbitrarily, and thus each pump can be driven impartially.

Description

  The present invention relates to a pump system that quickly sends out water flowing into a water absorption tank using a plurality of pumps, and more particularly to a technique for preventing consumption of each pump from being biased by operating each pump uniformly.

  For example, in a rainwater pump station in a large city, when rainwater flows into a water absorption tank due to heavy rain and the water level reaches a certain level, the pump is operated to discharge the rainwater that has flowed in. A plurality of pumps are usually used for discharging rainwater, and the pumps are sequentially operated according to the water level of the water absorption tank to discharge according to the amount of inflow.

  As a conventional pump system, for example, as shown in FIG. 11, three pump devices 102 </ b> A, 102 </ b> B, 102 </ b> C are installed inside the water absorption tank 101, and the pump devices 102 </ b> A, 102 </ b> B are sequentially installed according to the water level of the water absorption tank 101. , 102C is driven to drain water according to the amount of flowing water.

  Hereinafter, the pump system shown in FIG. 11 will be described. The three pump devices 102A, 102B, and 102C provided in the water absorption tank 101 are set so that the heights of the pumps 103A, 103B, and 103C are different from each other. The pump 103A is installed at the lowest position (for example, at an interval of 50 cm), and the installation positions are set to be higher in the order of the pumps 103B and 103C. Then, when the water level in the water absorption tank 101 reaches DWL (A), pumping by the pump 103A is started, and when reaching the DWL (B), pumping by the pump 103B is started in addition to the pump 103A, and further to the DWL (C). When reaching, pumping by the pump 103C is started in addition to the pumps 103A and 103B. Thereby, it becomes possible to change the number of pumps operated according to a water level.

  However, in the pump system shown in FIG. 11, the pump 103A installed at the lowest position of the impeller operates first, and then sequentially operates in the order of the pumps 103B and 103C. Therefore, the operation time of the pump 103A becomes the longest. The operating time of the pump 103C is the shortest. Therefore, the pump operating time is uneven for each pump 103A, 103B, 103C, and consumables such as underwater bearings have a great difference in wear. For this reason, the replacement time of consumables differs for each pump, and the operation needs to be stopped each time, and there is a problem that much labor is required for disassembling and assembling the pump.

  Furthermore, when one of the three pumps 103A, 103B, 103C fails, there is a drawback that smooth drainage cannot be performed. For example, when the pump 103A installed at the lowest stage fails, even if the other pumps 103B and 103C are normal, the drainage start level becomes DWL (B), and quick drainage is possible. The problem of disappearing arises.

  In order to solve this problem, for example, what is described in JP 2010-138876 A (Patent Document 1) is known. In Patent Document 1, the pumping start water level and pumping stop water level of each pump can be determined by supplying air from the blower into the pump casing, so that the operation order of each pump can be set arbitrarily. Thus, the operation time of each pump can be made uniform.

JP 2010-138876 A

  However, in the conventional example disclosed in Patent Document 1, a blower for supplying air into the pump casing and electric power for operating the blower are required. The problem arises that increases. Further, when the water level detection device or the compressed air supply source fails or the power source is lost, there arises a problem that the entire pump system does not function.

  The present invention has been made in order to solve such a conventional problem, and an object of the present invention is to provide a pump system capable of driving a plurality of pumps without deviation with a simple configuration. There is.

  In order to achieve the above object, the invention described in claim 1 of the present application is provided in a water absorption tank, and in a pump system that discharges water flowing into the water absorption tank to the outside, a plurality of installed in the water absorption tank. Each of the pump devices includes a pump pipe (11), a suction pipe is connected to the introduction side, a pumping pipe is connected to the delivery side, and a vertical shaft type pumping up water flowing into the water absorption tank in a substantially vertical direction. A pump (14), a sealing means (for example, a discharge valve 17 and a flap valve 18) provided at a discharge port downstream of the pumping pipe and hermetically sealing the discharge port; and the sealing means Pressure adjusting means (for example, an air vent valve 26, a pumping start water level adjusting valve 28, a check valve 29) for setting the air pressure inside the pump to a desired pressure when the discharge port is sealed; And the pressure adjusting means for each pump device. Wherein the air pressure of the internal-flop is set differently.

  The invention according to claim 2 is characterized in that the pressure adjusting means has a valve group including an air vent valve connected to the pumping pipe and a plurality of valves connected to the air vent valve and arranged in parallel to each other. The group flows in air from the outside air to the air vent valve side, and prevents a flow of air from the air vent valve side to the outside air, a check valve for preventing air from flowing from the outside air to the air vent side, and When the air pressure inside the pump reaches a preset pressure threshold value, a pumping start water level adjustment valve that discharges air from the air vent side to the outside air, and the pressure of the pumping start water level adjustment valve for each pump The threshold value is set differently.

  The invention according to claim 3 is characterized in that the pumping start water level adjusting valve can adjust a set pressure by manual operation and arbitrarily set a pumping start water level by adjusting the set pressure. According to a fourth aspect of the present invention, the valve group further includes a starting setting valve (27) in addition to the check valve and a pumping start water level adjusting valve, and the suction device among the plurality of pump devices. When the water level of the water tank rises, only the starting setting valve provided in the pump device that starts pumping first is opened, and the starting setting valves provided in other pump devices are closed.

  According to a fifth aspect of the present invention, each pump device has an intake pipe that communicates with the suction pipe, and an intake valve (pumping water) that adjusts an amount of air flowing into the suction pipe at an end of the intake pipe. A shut-off water level adjusting valve 25) and a check valve that allows air to flow from the outside air to the suction pipe side and prevent the outflow of air from the suction pipe side to the outside air are provided.

  The invention according to claim 6 is characterized in that the opening degree of the intake valve can be adjusted manually, and a pumping cutoff water level can be arbitrarily set for each pump device.

  The invention according to claim 7 is characterized in that the sealing means hermetically seals the discharge port of the pumping pipe when water is not supplied from the pumping pipe, and the water pressure when the water is supplied from the pumping pipe. It is a flap valve opened by.

  According to an eighth aspect of the present invention, the sealing means is a valve (discharge valve 17) that is electrically driven, and before the pump starts pumping, the discharge port is sealed and pumping is started. In this case, the discharge port is opened.

  In the pump system according to the present invention, each pump device includes pressure adjusting means, and the air pressure inside the pump can be set by the pressure adjusting means. Therefore, by setting the air pressures of the plurality of pump devices to be different from each other, the water level when each pump device sucks water can be adjusted, so that the pumping start order of each pump device is arbitrarily determined. It becomes possible. Therefore, there is no need to change the pump height of multiple pump devices as in the past, and even if the specifications, shapes, and installation conditions of all pump devices are unified, pumping can be started by adjusting the pressure adjustment means. Since the order can be determined, it is possible to eliminate the deviation of the operation time such as the operation time of the specific pump device becoming longer, and each pump device can be operated uniformly.

  As a result, the maintenance cycle can be made substantially constant. In addition, even when one of the plurality of pump devices fails, another pump device can be used instead, so that it is possible to perform a smooth drainage treatment with high flexibility. Since multiple pump units have the same specifications, the time and cost required for design and production can be reduced.

  Furthermore, since it is not the structure which uses a fan like the prior art disclosed by patent document 1, the problem that an apparatus becomes large-scale and the stoppage of the function of a pump system by the loss of a power supply, or the failure of a control system are eliminated. Can do.

It is explanatory drawing which shows typically the structure of the pump apparatus used for the pump system which concerns on one Embodiment of this invention. It is explanatory drawing which shows the state when it concerns on the pump system which concerns on one Embodiment of this invention, and the water level of a water absorption tank is low. It is explanatory drawing which shows the state when it concerns on the pump system which concerns on one Embodiment of this invention, and the water level of a water absorption tank has reached DWL (A). It is explanatory drawing which shows the state when it concerns on the pump system which concerns on one Embodiment of this invention, and the water level of a water absorption tank has reached DWL (B). It is explanatory drawing which shows the state when it concerns on the pump system which concerns on one Embodiment of this invention, and the water level of a water absorption tank has reached DWL (C). It is explanatory drawing which shows the state when it concerns on the pump system which concerns on one Embodiment of this invention, and the water level of a water absorbing tank has reached AWL. It is explanatory drawing which shows the state when it concerns on the pump system which concerns on one Embodiment of this invention, and the water level of a water absorption tank is less than AWL. It is explanatory drawing which shows the state when it concerns on the pump system which concerns on one Embodiment of this invention, and the water level of a water absorption tank falls to SWL (C). It is explanatory drawing which shows the state when it concerns on the pump system which concerns on one Embodiment of this invention, and the water level of a water absorption tank falls to SWL (B). It is explanatory drawing which shows the state when it concerns on the pump system which concerns on one Embodiment of this invention, and the water level of a water absorption tank falls to SWL (A). It is explanatory drawing which shows the structure of the conventional pump system.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[Description of Configuration of this Embodiment]
FIG. 1 is an explanatory view schematically showing a pump device used in a pump system according to an embodiment of the present invention. In this embodiment, as will be described later, three pump devices shown in FIG. 1 are installed in parallel, and the operation start order of these pump devices is appropriately changed so that the operation time of each pump device becomes uniform. To do.

  As shown in FIG. 1, the pump device 11 is a device that is provided in a water absorption tank 12 into which rainwater flows in during rain, and when the water level of the water absorption tank 12 becomes high, pumps up water and discharges it to the outside. Connected to a vertical shaft pump 14 for pumping water in the water tank 12, a suction pipe 13 connected to the introduction side (lower side in the figure) of the pump 14, and a delivery side (upper side in the figure) of the pump 14. A pumping pipe 15 is provided.

  The suction pipe 13 is configured such that the lower side spreads in a bell shape, and the end surface thereof is disposed so as to have a predetermined height from the bottom surface of the water absorption tank 12. The upper part of the pumping pipe 15 is bent at a substantially right angle, a discharge valve 17 is provided on the pipe line, and a flap valve 18 is further provided on the downstream side thereof. The downstream side of the flap valve 18 is connected to a discharge flow path (not shown).

  The pump 14 is, for example, a main shaft 19 that transmits rotational power of a driving device (not shown) such as a motor, and an impeller that is provided at the tip of the main shaft 19 and pumps water flowing into the water absorption tank 12 to the pumping pipe 15. 16, bearings 20 and 21, and a pump casing 22 that covers the periphery of the impeller 16. When the motor is driven to rotate, the rotational power is transmitted to the impeller 16 via the main shaft 19, and the water reaching the height of the impeller 16 by the rotation of the impeller 16 is pumped upward.

  In addition, an intake pipe 23 communicates with the suction pipe 13 slightly below the impeller 16, and the front end of the intake pipe 23 is connected via a check valve 24 and a pumping cutoff water level adjustment valve 25 (intake valve). , Open to the open air. The check valve 24 releases the inflow of air from the outside air side to the intake pipe 23 side, and prevents the outflow of air from the intake pipe 23 side to the outside air side. Further, the opening degree of the pumping cutoff water level adjustment valve 25 can be adjusted manually, and the amount of air flowing into the suction pipe 13 can be adjusted by adjusting the opening degree. Specifically, by increasing the opening degree, it is possible to reduce the pipe resistance in the intake pipe 23 and allow a large amount of air to flow into the suction pipe 13, and by reducing the opening degree, The pipe resistance can be increased so that a large amount of air does not flow into the suction pipe 13.

  That is, the pumping cutoff water level adjusting valve 25 adjusts the inflow amount of air into the suction pipe 13 by making the pipe resistance in the intake pipe 23 different, and the pumping cutoff water level can be arbitrarily set by each pump device 11. Is.

  In addition, an air vent valve 26 communicates with a portion slightly upstream of the discharge valve 17 at the tip of the pumping pipe 15, and the air vent valve 26 further includes a starting setting valve 27 and a pumping start water level adjusting valve 28. And a check valve 29 in parallel connection (valve group).

  The air vent valve 26 is “open” when pumping by the pump 14 is not performed, and operates to be “closed” when pumping is started by the pump 14 and water flows into the pumping pipe 15. . As the air vent valve 26, for example, a ball-shaped floating ball can be installed, and a valve that shuts off the air flow path by utilizing the fact that water flows into the pumping pipe 15 and the floating ball rises can be used.

  The advance setting valve 27 can be set in an open / close state by manual operation, and as described later, only the advance setting valve 27 provided in the pump device 11 to be activated first among a plurality of pump devices 11 is set to “open”. Then, the starting setting valve 27 of the other pump device 11 (the pump device to be operated after the second) is set to “closed”.

  The pumping start water level adjusting valve 28 can easily adjust the set pressure by manual operation, and the pumping start water level can be arbitrarily adjusted by setting the air pressure in the pumping pipe 15 to a desired pressure. Further, the inflow of air from the outside air to the pumping pipe 15 side is prevented.

  The check valve 29 releases the inflow of air from the outside air side to the pumping pipe 15 side and prevents the outflow of air from the pumping pipe 15 side to the outside air side.

  That is, the valve group includes a check valve 29 that allows air to flow from the outside air to the air vent valve 26 side and prevents outflow of air from the air vent valve 26 side to the outside air, and a pressure set in advance by the air pressure inside the pump. When the threshold value is reached, a pumping start water level adjusting valve 28 is provided to allow air to flow out from the air vent valve 26 side to the outside air and to prevent air from flowing from the outside air to the air vent valve 26 side. Further, the valve group has a start setting valve 27, and only the start setting valve 27 provided in the pump device that starts pumping first when the water level of the water absorption tank 12 rises among the plurality of pump devices. Is opened, and the advance setting valve 27 provided in the other pump devices is closed.

  The air vent valve 26 and the above valve group constitute pressure adjusting means for setting the air pressure inside the pump 14 to a desired pressure.

  The flap valve 18 is “closed” except during drainage to maintain airtightness in the pump 14, and becomes “open” when the pump 14 is activated and water is sent out from the pumping pipe 15. The sent water is sent to the discharge channel on the downstream side.

  The discharge valve 17 is a valve that is electrically opened and closed, and is always in an “open” state. That is, the discharge valve 17 and the flap valve 18 are provided at the discharge port of the pumped-up pipe 15 and have a function as a sealing unit that hermetically seals the discharge port.

  Next, as shown in FIG. 2, the operation | movement at the time of discharging | emitting the water which flows in in the water absorption tank 12 using the three pump apparatuses 11 comprised as mentioned above using each pump apparatus 11 is demonstrated. . In the following description, the three pump devices 11 are denoted by symbols A, B, and C, respectively, to distinguish each pump device 11. If there is no need to distinguish between them, the symbols A, B, and C are not used. First, an initial setting operation before starting operation will be described.

[Initial setting operation]
In this embodiment, it sets so that the opening degree of the pumping cutoff water level adjustment valve 25 of the three pump apparatuses 11 installed in the water absorption tank 12 may differ. Specifically, the opening degree of the pumping cutoff water level adjustment valve 25C of the pump device 11C is maximized, and the opening degree is set smaller in the order of the pumping cutoff water level adjustment valves 25B and 25A. By setting in this way, as will be described later, each pump device 11 can be set so that the water level at the time of shutting off the pumped water is different.

  Further, as shown in FIG. 2, the advance setting valve 27A of the pump device 11A is set to “open”, and the advance setting valves 27B and 17C of the pump devices 11B and 11C are set to “close”. Since this setting can be initially performed by the operator, the first setting valve 27B is set to “open”, the other is set to “closed”, the first setting valve 27C is set to “open”, and the others are set. By setting it to “closed”, it is possible to determine the pump device 11 to be activated first.

  Furthermore, the set pressure of the pumping start water level adjusting valve 28B of the pump device 11B is adjusted so that the maximum value of the air pressure in the pump 14B becomes Pb [mAq] (pressure threshold). That is, when the water level in the water absorption tank 12 rises and the air pressure in the pump 14B rises and exceeds the pressure Pb, the air in the pumping pipe 15B flows out to the outside air via the pumping start water level adjustment valve 28B. The air pressure inside the pump 14B is adjusted to be Pb.

  Similarly, the maximum value of the air pressure in the pump 14C is set to Pc [mAq] (pressure threshold) by adjusting the pressure of the pumping start water level adjusting valve 28C of the pump device 11C. That is, when the water level in the water absorption tank 12 rises and the air pressure in the pump 14C rises and exceeds the pressure Pc, the air in the pumping pipe 15C flows out to the outside air via the pumping start water level adjustment valve 28C. The air pressure inside the pump 14C is adjusted to be Pc. At this time, Pb <Pc.

  In addition, about the pump apparatus 11A, since the advance setting valve 27A is "open", the pressure adjustment of the pumping start water level adjustment valve 28A is unnecessary.

[Operation at the start of drainage]
Next, the operation at the start of operation will be described. FIG. 2 shows a case where the amount of water flowing into the water absorption tank 12 is small, and the water level of the water absorption tank 12 is slightly higher than the lower end surface of the suction pipe 13 of each pump device 11. When information on the possibility of a large amount of water flowing into the water absorption tank 12 is obtained, such as information about heavy rain in the vicinity of the water absorption tank 12, the pump 14 of each pump device 11 is operated. Let Therefore, as shown in FIG. 2, the impeller 16 of each pump 14 starts to rotate. At this time, since the water level in the water absorption tank 12 does not reach the height of the impeller 16 of each pump 14, all the three pumps 14 are in the air standby operation and no pumping is performed.

  And since the inside of pump 14A is made into atmospheric pressure by the above-mentioned initial setting, water has flowed into suction pipe 13A to the same water level as water-absorbing tank 12, and about pumps 14B and 14C, pump 14B , 14C, the water surface is pushed down by the air pressure Pb, Pc inside, so that water does not flow into the suction pipes 13B, 13C. Specifically, Pb and Pc [m] are respectively pressed down by Pb and Pc [mAq].

  Next, the water level in the water absorption tank 12 rises and reaches the water level at which the impeller 16A of the pump 14A contacts the water (this is the pumping start water level DWL (A) by the pump device 11A) as shown in FIG. Then, pumping by the pump device 11A is started. At this time, since the pump 14A sucks water from the suction pipe 13A, the air pressure in the intake pipe 23A becomes a negative pressure, so that outside air flows into the intake pipe 23A from the pumped water cutoff level adjustment valve 25A, It flows into the suction pipe 13A. Accordingly, the pump 14A is in an air-water mixing operation and pumps water into the pumping pipe 15A.

  And the unstable operation of the pump due to the low water level can be avoided by performing the air-water mixing operation. That is, if air does not flow in from the intake pipe 23A, the pump 14A becomes unstable due to repeated pumping and shut-off when the water level is at a level that is close to the impeller 16A. On the other hand, the operation at the start of pumping by the pump 14A can be stabilized by introducing air from the intake pipe 23A and performing the air-water mixing operation.

  Thereafter, the water pumped up to the pumping pipe 15A reaches the flap valve 18A via the discharge valve 17A, and the flap valve 18A is opened by water pressure, so that the water pumped up by the pump 14A is discharged from the downstream discharge channel ( (Not shown). Further, when water is pumped into the pumping pipe 15A, the air vent valve 26A is "closed", and the introduction of outside air into the pumping pipe 15A is blocked.

  On the other hand, in the pump device 11B, since the air pressure in the pump 14B is set to the pressure Pb described above, the water level in the suction pipe 13B is pushed downward by this pressure and does not reach the height of the impeller 16B. Similarly, in the pump device 11C, the water level in the suction pipe 13C is pushed downward and does not reach the height of the impeller 16C.

  Therefore, the pump devices 11B and 11C are kept in the air standby operation, and the water flowing into the water absorption tank 12 is discharged only by the pump device 11A.

  Next, the water level in the water absorption tank 12 further rises and the water level at which the impeller 16B of the pump device 11B comes into contact with water as shown in FIG. 4 (this is the pumping start water level DWL (B) by the pump device 11B). Is reached, pumping by the pump device 11B is started. At this time, since the pump 14B sucks water, the air pressure in the intake pipe 23B becomes a negative pressure. Therefore, outside air flows into the intake pipe 23B from the pumped water shutoff water level adjustment valve 25B, and further inside the intake pipe 13B. Flow into. Accordingly, the pump 14B operates as an air-water mixing operation to pump water into the pumping pipe 15B.

  By performing the air / water mixing operation, the unstable operation of the pump due to the low water level can be avoided as in the case of the pump 14A.

  Thereafter, the water pumped to the pumping pipe 15B reaches the flap valve 18B via the discharge valve 17B, and the flap valve 18B is opened by the water pressure, so that the water pumped by the pump 14B is discharged from the downstream discharge channel. To be sent to. Further, when water is pumped into the pumping pipe 15B, the air vent valve 26B is "closed", and introduction of outside air into the pumping pipe 15B is blocked.

  On the other hand, in the pump device 11C, since the air pressure is set to Pc (> Pb), the water level does not rise to the height of the impeller 16C, and the atmospheric operation is continued. Therefore, the water flowing into the water absorption tank 12 is discharged by the two pump devices 11A and 11B.

  Thereafter, the water level in the water absorption tank 12 further rises to a water level where the impeller 16C of the pump device 11C comes into contact with water (this is referred to as a pumping start water level DWL (C) by the pump device 11C) as shown in FIG. When reaching, pumping by the pump device 11C is started.

  At this time, since the pump 14C sucks water, the air pressure in the intake pipe 23C becomes a negative pressure, so that outside air flows into the intake pipe 23C from the pumped water cutoff water level adjustment valve 25C, and further, in the suction pipe 13C. Flow into. Therefore, the pump 14C becomes an air-water mixing operation and pumps water to the pumping pipe 15C.

  Then, by performing the air-water mixing operation, an unstable operation of the pump due to the low water level can be avoided as in the pumps 14A and 14B.

  Thereafter, the water pumped to the pumping pipe 15C reaches the flap valve 18C via the discharge valve 17C, and the flap valve 18C is opened by the water pressure, so that the water pumped by the pump 14C is discharged from the downstream discharge channel. To be sent to. Further, when water is pumped up to the pumping pipe 15C, the air vent valve 26C is “closed” and the introduction of outside air is blocked. Therefore, the water flowing into the water absorption tank 12 is discharged by all the pump devices 11A, 11B, 11C.

  When each pump device 11 is actuated, each air vent valve 26 is “closed”, so that it operates under the same conditions regardless of the set pressure of the pumping water level adjustment valve 28. Further, when the water level further rises and reaches the total drainage water level AWL (> DWL (C)) as shown in FIG. 6, the air pressure in the intake pipe 23 of each pump device 11 rises, Since the difference is reduced, the air flowing in from each pumping cutoff water level adjusting valve 25 is shut off. Accordingly, each pump 14 is switched to a full drainage operation (operation in which no air is mixed).

  As described above, when rainwater flows into the water absorption tank 12 and the water level rises, pumping by the pump device 11A is started when the water level reaches DWL (A), and then the water level further rises and DWL (B). Is reached, pumping by the pump device 11B is started. Further, when the water level further rises and reaches DWL (C), pumping by the pump device 11C is started. Therefore, it is possible to sequentially operate the three pump devices 11 according to the water level of the water absorption tank 12 to discharge rainwater flowing into the water absorption tank 12.

[Operation when drainage is stopped]
Next, the stop operation of each pump device 11 when the water level in the water absorption tank 12 is lowered will be described. As shown in FIG. 6, when the water level of the water absorption tank 12 decreases and falls below the total drainage water level AWL while the three pump devices 11 are operating in parallel, as shown in FIG. Since the air pressure in the pipe 23 becomes negative, each pump 14 pumps water while sucking air from the intake pipe 23. That is, the water is pumped up in an air-water mixing operation.

  If the water level in the water absorption tank 12 falls by continuing pumping, the amount of air sucked from the intake pipe 23 increases. Then, as shown in FIG. 8, when the water level in the water absorption tank 12 is lowered to the pumping cutoff water level (hereinafter referred to as SWL (C)) of the pump 14C, a large amount of air is sucked from the intake pipe 23C of the pump device 11C. The area | region filled with air arises in the lower part of the vehicle 16C, water cannot be sucked, and the pump 14C shifts to a pumping-off operation for stopping pumping.

  At this time, as described above, the pumping cutoff water level adjustment valve 25C of the pump device 11C is set so that the opening degree is the largest and the opening degree becomes smaller in the order of 25B and 25A. SWL (C) is the highest water level, and then the pumping cutoff water level (hereinafter referred to as SWL (B)) of the pump device 11B is the second highest water level, and the pumping cutoff water level (hereinafter referred to as SWL (hereinafter referred to as SWL (B)) of the pump device 11A. A)) is the lowest water level.

  When the pump device 11C shifts to the pumping-off operation, the flap valve 18C is “closed”, so that the inflow of air from the downstream side of the pumping pipe 15C is blocked. However, since the air vent valve 26C is “opened” by lowering the water surface in the pumping pipe 15C, air flows into the pumping pipe 15C via the check valve 29C. Therefore, the water staying in the pumping pipe 15C and the pump 14C gradually falls into the water absorption tank 12 due to its own weight.

  After that, when the water level further decreases to SWL (B) as shown in FIG. 9, a large amount of air is sucked from the intake pipe 23B of the pump device 11B, and a region filled with air is generated at the lower part of the impeller 16B. Water can no longer be sucked, and the pump 14B shifts to a pumping-off operation for stopping pumping.

  When the pump device 11B shifts to the pumping-off operation, the flap valve 18B is “closed”, so that the inflow of air from the downstream side of the pumping pipe 15B is blocked. However, since the air vent valve 26B is “opened” by lowering the water surface in the pumping pipe 15B, air flows into the pumping pipe 15B via the check valve 29B. Therefore, the water staying in the pumping pipe 15B and the pump 14B gradually falls into the water absorption tank 12 due to its own weight.

  When the water level further decreases to SWL (A) as shown in FIG. 10, a large amount of air is sucked from the intake pipe 23A of the pump device 11A, and a region filled with air is generated in the lower part of the impeller 16A. Suction cannot be performed, and the pump 14A shifts to a pumping-off operation for stopping pumping.

  Then, when the pump device 11A shifts to the pumping off operation, the flap valve 18A is “closed”, so that the inflow of air from the downstream side of the pumping pipe 15A is prevented. However, since the air vent valve 26A is “opened” by lowering the water surface in the pumping pipe 15A, air flows into the pumping pipe 15A through the starting setting valve 27A and the check valve 29A. Therefore, the water staying in the pumping pipe 15A and the pump 14A gradually falls into the water absorption tank 12 due to its own weight. Thereafter, when time elapses, all of the water staying in the pumping pipe 15 and the pump 14 of each pump device 11 falls into the water absorption tank 12, and each pump device 11 enters a standby state.

  Thus, the stop order of each pump apparatus 11 when the water level of the water absorption tank 12 falls can be determined by setting the opening degree of the pumping cutoff water level adjusting valve 25 to be different for each pump apparatus 11. It can be done.

  Thus, in the pump system according to the present embodiment, the air vent valve 26 is connected to the pumping pipe 15 of each pump device 11, and further, the start setting valve 27, the pumping start water level adjusting valve 28, And the check valve 29 is connected in parallel. And the starting order of each pump apparatus 11 when the water level of the water absorption tank 12 rises is set by adjusting the advance setting valve 27 and the pumping start water level adjustment valve 28.

  That is, by setting the starting setting valve 27 to “open”, it is possible to determine the pump device 11 to be operated first, and further by adjusting the set pressure of the pumping start water level adjusting valve 28, Since the pressure can be set, the second and third pump devices 11 to be operated can be determined. In other words, the operator can determine the operation sequence of each pump device 11 by adjusting the open / closed state of each starter setting valve 27 and the set pressure of each pumping start water level adjusting valve 28.

  Accordingly, by appropriately changing the operation sequence according to the operation frequency of each pump device 11, it is possible to adjust the accumulated operation time of each pump device 11 to be uniform. The degree of deterioration of the consumables provided can be matched. For this reason, it is possible to greatly reduce the maintenance effort.

  Even when one of the three pump devices 11 fails and cannot be operated, the pressure of the pumping start water level adjustment valve 28 of the other two pump devices 11 is reset. Thus, each pumping start water level can be arbitrarily determined, and prompt drainage can be performed. Furthermore, since each valve for adjusting the air pressure in the pump 14 can be adjusted manually, an electric control means such as a control device is not required, and the device configuration can be simplified.

  In this embodiment, a flap valve 18 is provided at the tip of the pumping pipe 15, and when pumping is not performed by the pump 14, the pumping pipe 15 and the pump 14 are hermetically sealed by the flap valve 18. However, if the airtightness cannot be maintained by the flap valve 18, the airtightness in the pumping pipe 15 and the pump 14 can be maintained by electrically opening and closing the discharge valve 17. it can. For example, when a water level sensor is installed at an appropriate position of the pumping pipe 15 and it is not detected that the water is pumped by the water level sensor, the discharge valve 17 is fully closed to maintain airtightness. When it is detected that the water is pumped, the discharge valve 17 may be fully opened and the pumped water may be sent to the downstream water channel.

  Further, in this embodiment, the first setting valve 27 of the pump device 11 to be operated first is set to “open” so that the air pressure in the pump device 11 becomes atmospheric pressure. It is also possible to set the air pressure in the pump device 11 to atmospheric pressure by adjusting the pressure of the pumping start water level adjusting valve 28 without installing 27. That is, by setting the pumping start water level adjustment valve 28 to a fully open state, it is possible to perform a role substantially equivalent to opening the starting setting valve 27 substantially.

  As mentioned above, although the pump system of this invention was demonstrated based on embodiment of illustration, this invention is not limited to this, The structure of each part can be substituted by the thing of the arbitrary structures which have the same function. it can.

  For example, in the pump system according to the present embodiment, an example in which three pump devices 11 are installed as an example has been described. However, the present invention is not limited to this, and the number is two or four or more. Is also possible.

  Moreover, although this embodiment demonstrated the example which starts pumping in order of pump apparatus 11A, 11B, 11C, and stops pumping in order of pump apparatus 11C, 11B, 11A, the order at the time of a start and the time of a stop The order can be set arbitrarily.

  INDUSTRIAL APPLICABILITY The present invention can be used to discharge water by operating a pump device in accordance with an increased water level when the level of rainwater flowing into a water absorption tank rises.

DESCRIPTION OF SYMBOLS 11 Pump apparatus 12 Water absorption tank 13 Suction pipe 14 Pump 15 Pumping pipe 16 Impeller 17 Discharge valve 18 Flap valve 19 Main shaft 20,21 Bearing 22 Pump casing 23 Intake pipe 24 Check valve 25 Pumping shutoff water level adjustment valve 26 Air vent valve 27 Starter Setting valve 28 Pumping start water level adjustment valve 29 Check valve

Claims (8)

In the pump system that is provided in the water absorption tank and discharges the water flowing into the water absorption tank to the outside,
A plurality of pump devices installed in the water absorption tank,
Each pump device is
A suction pipe is connected to the introduction side, a pumping pipe is connected to the delivery side, and a vertical shaft type pump that pumps water flowing into the water absorption tank in a substantially vertical direction;
A sealing means provided at a discharge port on the downstream side of the pumping pipe and hermetically sealing the discharge port;
Pressure adjusting means for setting the air pressure inside the pump to a desired pressure when the discharge port is sealed by the sealing means,
The pump system according to claim 1, wherein the pressure adjusting means sets the air pressure inside the pump to be different for each pump device. The pressure adjusting means has a valve group consisting of an air vent valve connected to the pumping pipe, and a plurality of valves connected to the air vent valve and arranged in parallel to each other,
The valve group includes a check valve that flows air from outside air to the air vent side, and prevents outflow of air from the air vent side to outside air;
A pumping start water level adjusting valve that prevents the inflow of air from the outside air to the air vent side, and that causes the air to flow out from the air vent side to the outside air when the air pressure inside the pump reaches a preset pressure threshold; With
2. The pump system according to claim 1, wherein a pressure threshold value of the pumping start water level adjusting valve is set to be different for each pump.   3. The pump system according to claim 2, wherein the pumping start water level adjusting valve is capable of adjusting a set pressure by a manual operation, and arbitrarily setting a pumping start water level by adjusting the set pressure. In addition to the check valve and the pumping start water level adjustment valve, the valve group further includes a starting setting valve,
Of the plurality of pump devices, when the water level of the water absorption tank rises, only the first setting valve provided in the pump device that starts pumping first is opened, and the first setting valve provided in the other pump devices The pump system according to claim 2, wherein the pump system is closed. Each of the pump devices has an intake pipe communicating with the suction pipe,
An intake valve for adjusting the amount of air flowing into the suction pipe at the end of the intake pipe;
5. The check valve according to claim 1, further comprising a check valve that allows air to flow from outside air to the suction pipe side and prevents air from flowing from the suction pipe side to outside air. The pump system described.   The pump system according to claim 5, wherein the intake valve can be adjusted by a manual operation, and a pumping cutoff water level can be arbitrarily set for each pump device.   The sealing means is a flap valve that hermetically seals the discharge port of the pumping pipe when water is not supplied from the pumping pipe, and is opened by the water pressure when water is supplied from the pumping pipe. The pump system according to any one of claims 1 to 6, wherein:   The sealing means is a valve that is driven electrically, and the discharge port is sealed before the pump starts pumping, and the discharge port is opened when pumping is started. The pump system according to any one of claims 1 to 6.

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