JP2015038329A - Submerged pump operation control device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a countermeasure technology against some defects found in a device in which an operation and a stopping of a submerged pump are carried out under application of the conventional water level sensor so as to control a water level in a discharge water reservoir, the water level sensor is frequently troubled due to discharging of water and the water level control cannot be performed.SOLUTION: The conventional water level sensor is eliminated and in place of it, an idling operation sensor 12d is used. When the idling operation sensor 12d detects an idling operation signal, a control unit 12b immediately stops a submerged pump 12c. After that, the control unit 12b energizes the submerged pump 12c. This stopping and re-energization are repeated to control a water level 13a in a discharged water reservoir within a pre-set range. The re-energization is carried out at a specified period (a mode A), after specified time after stopping (a mode B), and after a time corresponding to an operation time of the submerged pump 12c after stopping (a mode C) and the like.

Description

  In the present invention, a submersible pump is installed in the drainage tank to control the operation and stop in advance, by installing a submersible pump in the drainage tank such as a sewage tank that primarily collects sewage from the household and a water discharge place during construction. The present invention relates to a device for controlling to be within a set water level range.

  Hereinafter, based on FIG. 4, the operation control apparatus of the conventional submersible pump used for a drainage tank is demonstrated. In the figure, an operation control device 42a for the submersible pump includes a control unit 42b, a submersible pump 42c, an operation start sensor 42f, and an operation stop sensor 42g, and is installed in the drain tank 41. The wastewater flow 44a is a flow in which wastewater is sucked up from the water inlet 42d of the submersible pump 42c from the inlet 44b and discharged to the outside of the drainage tank 41 from the outlet 44c.

  When the drainage water level 43a reaches the operation start water level 43b, the operation start sensor 42f detects it, and the control unit 42b drives the submersible pump 42c. When the drainage water level 43a becomes the operation stop water level 43c, the operation stop sensor detects, and the control unit 42b stops the operation of the submersible pump 42c. As described above, the control unit 42b of the submersible pump operation control device 42a receives the detection signals from the operation start sensor 42f and the operation stop sensor 42g to start and stop the submersible pump 42c, and sets the drain water level 43a of the drain tank 41. Control within a preset range.

A technique for controlling the operation of a submersible pump using a water level sensor is known.
(For example, see Patent Document 1)

Japanese Patent Laid-Open No. 11-15533

  In the operation control device of the submersible pump using the conventional water level sensor described above, the drainage water has various characteristics depending on the degree of dust and dirt, so that the detection failure of the water level sensor frequently occurs and the control becomes impossible. As a result, the submersible pump may break down.

  The present invention is intended to solve such problems of the conventional apparatus, and an object of the present invention is to realize a stable submersible pump operation control apparatus.

  In order to achieve the above object, the submersible pump control device of the present invention includes a control unit, a submersible pump, and an idling sensor. That is, the operation control device for the submersible pump of the present invention eliminates the water level sensor, and instead uses the idle operation sensor to start and stop the submersible pump and control the water level in the drainage tank within a preset range. To do.

  The idling sensor is much more stable than the water level sensor.

  The operation control device for the submersible pump according to the present invention controls the operation of the submersible pump using the detection signal of the above-described idling operation sensor, and therefore can perform stable control at low cost.

Schematic diagram of operation control device for submersible pump in an embodiment of the present invention Time chart for explaining the operation of the operation control device of the submersible pump Flow chart showing the operation of the operation control device of the submersible pump Schematic diagram of a conventional submersible pump operation controller using a water level sensor

  Hereinafter, an embodiment of the present invention will be described with reference to FIGS.

  In FIG. 1, a submersible pump 12c that drains from a tank to be drained, such as a sewage tank that temporarily collects sewage from a household or a water discharge place during construction, and an empty that detects an idle operation of the submersible pump 12c. An operation controller 12a for the submersible pump, which includes an operation sensor 12d and a control unit 12b for starting and stopping the submersible pump 12c by a detection signal from the idle operation sensor 12d, is disposed in the drain tank 11.

  The idling sensor 12d detects whether the submersible pump 12c is in a normal operation condition or an idling condition based on the sound, rotation speed, current, etc. of the operation condition. In the idle operation state and the normal operation state of the submersible pump 12c, the idle operation state has higher sound, faster rotation speed, and smaller current value. This is because the idling operation of the submersible pump 12c is a no-load operation, and the normal operation is a loaded operation. When the idling sensor 12d detects based on the current, it can be installed outside the drainage tank 11, and when it detects based on the rotational speed, it can be installed in a place isolated from the drainage in the submersible pump 12c. it can. As a result, the operation control device for the submersible pump of the present invention becomes inexpensive and stable.

  Drainage flows from the inlet 14b of the drainage tank 11, passes through the suction port 12e of the submersible pump 12c, and the discharge port 12f of the submersible pump 12c, and is discharged to the outside from the discharge port 14c of the drainage tank 11. This flow is the wastewater flow 14a.

  The submersible pump 12c enters the idling state at the water level of the suction port 12e, and the controller 12b immediately stops the submersible pump 12c. The drain water level 13a at this time is the operation stop water level 13c. If the drain tank water level 13a is equal to or lower than the operation stop water level 13c, it is the empty operation water level 13b.

When the submersible pump 12c is installed, the installation position of the suction port 12e is installed according to the idle operation water level 13b.

  When the drain tank water level 11 is at the idle operation water level 13b, when the control unit 12b starts the submersible pump 12c, the control unit 12b immediately stops the operation of the submersible pump 12c. The next start-up is performed after a sufficient time Th has passed to release the heat generated at this time. As a result, the submersible pump 12c is protected from the heat generated by the submersible pump 12c during idling.

  In FIG. 2, the controller 12b activates the submersible pump 12c (U, TaU), and the submersible pump 12c operates (Tu-n). Thereafter, when the idling sensor 12d detects idling, the controller 12b stops the operation of the submersible pump 12c, and the submersible pump 12c pauses (Td-n, Tb). As a result, the operation of the submersible pump 12c eliminates unnecessary operation and is a necessary minimum operation.

  Thereafter, the control unit 12b activates the submersible pump 12c. There are three modes (mode A, mode B, and mode C) as effective starting methods for starting the submersible pump 12c.

  Mode A is a method in which the controller 12b always starts TaU the submersible pump 12c at a preset constant period Ta. When the idling sensor 12d detects idling, the controller 12b stops the submersible pump 12c. Until the next start TaU, the submersible pump 12c is in a rest period (Td-n). For this reason, since mode A can separate the start and stop of submersible pump 12c, control part 12b can also be manufactured only with hardware, and operation control device 12a of an inexpensive submersible pump can also be made. If the drainage of the submersible pump 12c ends within the predetermined period Ta, if the inflow of drainage is fast, the operation period (Tu-n) of the submersible pump 12c is long and the pause period (Td-n) is short. That is, if the inflow is fast, the operation period of the submersible pump 12c is long, and if it is late, the pause period is long.

  In mode B, when the idling sensor 12d detects idling, the controller 12b stops the submersible pump 12c. Thereafter, the control unit 12b is activated after a predetermined fixed pause period Tb has elapsed. In the mode B, if the operation period (Tun) of the submersible pump 12c is substantially constant, the optimum rest period Tb can be easily set.

  In mode C, when the idling sensor 12d detects idling, the controller 12b stops the submersible pump 12c. Thereafter, the control unit 12b calculates a suspension period Td0 from (n + 1) operation periods (Tu-n to Tu0, n = 0, 1, 2,...) Before the submersible pump 12c stops, and this Td0 This is a method of starting after elapse of time. In mode C, there is also a method of calculating the suspension period Td0 by the average or weighted average of (n + 1) operation periods (Tu-n to Tu0) of the submersible pump 12c before the stop. Mode C can obtain the most optimal rest period Td0 for various operation periods of the submersible pump.

  In FIG. 3, the control unit 12b stops the submersible pump 12c (S2) if the control is not started (S1 N). If the control is started (S1 Y), the control unit 12b proceeds to step S3.

  In step S3, if it is mode A (S3 Y), start TaU with a fixed period Ta is started (S4). The control unit 12b stands by (S5 N) until the idling sensor 12d detects idling. When the idling sensor 12d detects idling (S5 Y), the controller 12b stops the submersible pump 12c (S6). The control unit 12b returns to Step S5 if the activation TaU has occurred (S8 Y) after the suspension period Th for heat dissipation has elapsed (S7). If the activation TaU has not occurred (S8 N), the control unit 12b stops the activation TaU (S10) if the control is terminated (S9 Y), and returns to step S1. If the control is not finished (S9 N), the control unit 12b returns to Step S8.

  If it is not mode A (S3 N), the control part 12b will start the submersible pump 12c (S11). The controller 12b stands by (S12 N) until the idle operation occurs. When idling occurs (S12 Y), the controller 12b stops the submersible pump 12c (S13). If it is mode B (S14 Y), after a certain pause period Tb elapses (S15), wait for the elapse of a waiting time Th (S16 N) for heat generation protection due to the idling operation of the submersible pump 12c. After the elapse (S16 Y), the process returns to step S1.

  If it is mode C (S14 N), the suspension period Td0 is calculated from (Tu-n to Tu0) (S17), and after the suspension period Td0 has elapsed (S18), the process proceeds to step S16.

  The submersible pump operation control device 12a of the present invention may be used for a submersible pump used in a domestic bathtub, a submersible pump at the bottom of a ship, a submersible pump in a sewage layer of a factory, and the like.

DESCRIPTION OF SYMBOLS 11 Drain tank 12a Operation control apparatus of submersible pump 12b Control part 12c Submersible pump 12d Empty operation sensor 12e Inlet
12f Discharge port 13a Drain tank water level 13b Empty operation water level 13c Operation stop water level 14a Drain flow 14b Inlet 14c Discharge port

Claims (6)

  Submersible pump operation comprising a submersible pump for draining from a drainage tank, an idling sensor for detecting idling of the submersible pump, and a controller for starting and stopping the submersible pump by a detection signal from the idling sensor. Control device.   The said control part starts the said submersible pump for every fixed period, and stops the said submersible pump by the detection signal of the said idle driving sensor, in order to hold | maintain a drain tank water level in the predetermined setting range. Submersible pump operation control device.   The control unit stops the submersible pump according to a detection signal of the idling sensor in order to maintain the drain tank water level within a predetermined setting range, and starts the submersible pump after a lapse of a certain time after the operation is stopped. The control device of the submersible pump according to 1. In order to maintain the drain water level in a predetermined setting range, the control unit stops the submersible pump by a detection signal of the idle operation sensor, and after a lapse of time according to the operation time before the submersible pump is stopped. The submersible pump control device according to claim 1, wherein the submersible pump is activated. The submersible pump according to any one of claims 1 to 4, wherein the idling sensor detects whether the submersible pump is in a normal operating condition or an idling condition based on sound, rotation speed, current, and the like of the operating condition of the submersible pump. Control device. The control unit immediately stops the operation of the submersible pump when the submersible pump is started at an idle operating water level, and restarts the operation of the submersible pump after releasing the heat generated by the submersible pump. The control apparatus of the submersible pump of any one of these.

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