JP4620445B2 - Pump automatic operation control device - Google Patents

Description

  2. Description of the Related Art There is known an automatic water supply device for a pump in which discharge ports of a plurality of pumps are connected via a communication pipe so that the number of pumps that are alternately operated in parallel according to a required amount of water is controlled.

  For example, when two pumps are used, the inverter that controls the operation of the two pumps is mounted on one control panel, so there is a problem that the control panel becomes large and the device becomes expensive. (See Patent Document 1).

  In addition, when two pumps are operated in parallel, instead of controlling the pressure discharged from the pumps to be the target pressure constant, a constant pressure water supply method is adopted, and the set pressure of the slave unit is set higher than the set pressure of the main unit. What is set low is now on sale (see Non-Patent Document 1).

In this case, since the pumps are stopped only by the flow rate detection device, the two units are stopped simultaneously. For this reason, after performing parallel operation with two pumps, there is a problem that even if the amount of water is small, the two pumps operate and wasteful power is consumed.
JP-A-4-58075 Water pressurizer catalog Matsushita Electric Industrial Co., Ltd. February 1991

Also, when two identical pumps are operated in parallel, the set pressure for constant target pressure control is 2
Since both units are the same, there was a problem that two units were operated and stopped simultaneously.

  The present invention has been made in view of the above points, and an object of the present invention is to provide an automatic operation control device for a pump that can reduce the size of a control panel and can alternately operate a plurality of pumps at low cost. .

First aspect of the present invention, a main pump, the discharge pressure of the main pump is reduced to the starting pressure and the first inverter to control the discharge pressure of the main pump to the target pressure P1 constant and the main pumping A sub pump in which the discharge port is connected to its own discharge port via a communication pipe, and a second inverter that controls the target pressure P2 (<P1) constant when the discharge side pressure of the sub pump decreases to the starting pressure And an overall control unit that outputs an operation command to the first and second inverters and controls alternate parallel operation of the main pump and the sub pump .

  According to a second aspect of the present invention, a pressure sensor and a flow rate sensor are respectively connected to the discharge port side of the main pump and the sub pump according to the first aspect, and the first inverter and the second inverter correspond to each other. Based on signals from the pressure sensor and the flow rate sensor, the pump performs a small water amount stop / restart and parallel cleaving operation to perform a constant target pressure operation.

The invention according to claim 3 is set to a value different from each other for each pump when the discharge side pressure of each pump decreases to the starting pressure, and a plurality of pumps whose discharge ports are connected via a communication pipe. An inverter provided for each pump that controls the target pressure to be constant, and an overall control unit that controls the operation of each inverter and controls the alternate parallel operation of each pump.

  In the invention according to claim 4, a pressure sensor and a flow sensor are connected to the discharge port side of each pump according to claim 3, and each inverter is based on a signal from the corresponding pressure sensor and flow sensor. The pump is characterized in that it operates at a constant target pressure by performing a low water quantity stop / restart and parallel cleaving operation.

  According to the first and second aspects of the present invention, the first inverter that sets the target pressure P2 of the slave pump to be smaller than the target pressure P1 of the main pump, and controls the discharge pressure of the main pump to be constant at the target pressure P1; Since the overall control unit for controlling the alternating parallel operation of each pump is provided above the second inverter that controls the discharge pressure of the slave pump to the target pressure P2 (<P1) constant, the overall control unit can be reduced, Moreover, it can be manufactured at low cost.

 According to the third and fourth aspects of the invention, when the plurality of pumps are operated alternately and in parallel, the overall control unit can be manufactured small and inexpensively.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. The configuration of this apparatus will be described with reference to FIG.

  In the figure, 11 is a main pump, 12 is a motor for driving the main pump 11, 13 is a sub pump, and 14 is a motor for driving the sub pump 13. 11a and 13a are suction ports.

  The discharge ports of the main pump 11 and the sub pump 12 are connected via a communication tube 15, and a communication tube discharge port 16 is provided at an intermediate portion of the communication tube 15.

  The pipe between the discharge port 11b of the main pump 11 and the end of the communication pipe 15 is provided with a flow rate sensor 17 for detecting the flow rate on / off and a pressure sensor 18 for detecting the discharge pressure.

  Further, the pipe between the discharge port 13b of the sub pump 13 and the end of the communication pipe 15 is provided with a flow rate sensor 19 for detecting the flow rate on / off and a pressure sensor 20 for detecting the discharge pressure.

The detection signals of the flow sensor 17 and the pressure sensor 18 are input to the main machine inverter 21, and the detection signals of the flow sensor 19 and the pressure sensor 20 are input to the slave inverter 22.
The main machine inverter 21 includes a target pressure constant control means for controlling the pressure of the fluid discharged from the main pump 11 so that the target pressure P1 is constant when the pump is stopped and restarted with a small amount of water.

  Further, the slave inverter 22 includes a target pressure constant control means for controlling the pressure of the fluid discharged from the slave pump 13 so that the target pressure P2 (<P1) is constant after the pump is stopped and restarted with a small amount of water. ing.

  Alternating parallel operation control of the main inverter 21 and the slave inverter 22 is performed by the overall control panel 23.

    Next, an automatic water supply apparatus equipped with this apparatus will be described with reference to FIGS. FIG. 5 is a plan view of the automatic water supply apparatus, and FIG. 6 is a front view. 5 and 6, the same parts as those in FIG. 1 are denoted by the same reference numerals.

  Next, the operation of the main inverter 21 will be described with reference to the flowchart of FIG. In FIG. 3, it is determined whether the pressure P detected by the pressure sensor 18 is equal to or lower than the starting pressure P3 (step S1). Here, the starting pressure P3 is smaller than the target pressure P2, as shown in FIG.

  If “YES” is determined in the determination in step S1, it is determined whether there is an operation instruction from the overall control panel 23 (step S2). This driving instruction will be described later. If it is determined “YES” in step S2, the main pump 11 is started and controlled to operate at a constant pressure at the target pressure P1 (step S3).

  Then, it is determined whether the pressure P detected by the pressure sensor 18 is larger than P1 and the output of the flow sensor (FS1) 17 is off (step S4). While the determination in step S4 is “NO”, the target pressure constant operation (step S3) is performed.

  On the other hand, when it is determined “YES” in step S4, the operation of the main pump 11 is stopped (step S5).

  Next, the operation of the slave inverter 22 will be described with reference to the flowchart of FIG. In FIG. 4, it is determined whether the pressure P detected by the pressure sensor 20 is equal to or lower than the starting pressure P3 (step S11). Here, the starting pressure P3 is smaller than the target pressure P2, as shown in FIG.

  If “YES” is determined in the determination in step S11, it is determined whether there is an operation instruction from the overall control panel 23 (step S12). This driving instruction will be described later. If "YES" is determined in the step S12, the sub pump 13 is started and a control is performed to operate at a constant pressure at the target pressure P2 (step S13).

  Then, it is determined whether the pressure P detected by the pressure sensor 20 is larger than P2 and the output of the flow sensor (FS2) 19 is off (step S14). While the determination in step S14 is “NO”, the target pressure constant operation (step S13) is performed.

  On the other hand, if “YES” is determined in the determination in step S14, the operation of the slave pump 13 is stopped (step S15).

 Next, the operation of the present apparatus configured as described above will be described with reference to the characteristic diagram of FIG. First, a faucet (not shown) connected to the communication pipe discharge port 16 is closed. When the faucet is opened from this state, the pressure detected by the pressure sensors 18 and 20 decreases. Then, when the pressure becomes equal to or lower than the starting pressure P3 shown in FIG. 2, “YES” is determined in steps S1 and S2 in the flowchart of FIG. 3, and the main pump 11 is operated at a constant pressure at the target pressure P1 (step S3).

  When the opening at the faucet further increases, the pressure detected by the pressure sensors 18 and 20 decreases.

  When the pressure detected by the pressure sensor 20 becomes equal to or lower than the starting pressure P3, “YES” is determined in steps S11 and S12 in the flowchart of FIG. 4, and the slave pump 13 is operated at a constant pressure at the target pressure P2 ( Step S13).

  Next, when the opening of the faucet is reduced and the flow rate is reduced, the pressure detected by the pressure sensor 20 exceeds P2, and the output of the flow rate sensor 19 is turned off, the sub pump 13 is stopped (step S15). ).

 Further, when the opening of the faucet is reduced and the flow rate is reduced, the pressure detected by the pressure sensor 18 becomes greater than P1, and the output of the flow rate sensor 17 is turned off, the main pump 11 is stopped (step S5).

 As described above, the main pump 11 is stopped and restarted by the main inverter 21 and controlled so that the target pressure (P1) is constant, and the sub pump 13 is controlled by the sub inverter 22 to reduce the amount of water. Stop / restart and control so that the target pressure (P2 <P1) is constant, and the overall control panel 23 controls each inverter 21 and 22 to operate alternately in parallel. There is no need to install. For this reason, the overall control panel 23 can be reduced in size, and the apparatus can be manufactured at low cost.

  In the above embodiment, the master inverter 21 and the slave inverter 22 operate the inverter when there is an operation instruction from the overall control panel 23, but when this operation instruction is output to the inverters 21 and 22, A flag provided for each inverter 21 and 22 may be set, and when this flag is set, the inverter may be operated.

  In addition, each inverter 21 and 22 makes an inquiry to the overall control panel 23 as to whether it can be operated, and in response to this inquiry, the overall control board 23 outputs an operation instruction for performing alternate parallel operation to each inverter. You may do it.

  In the above embodiment, an operation signal indicating the operation state of each inverter or a failure signal indicating a failure of each inverter may be output from the main inverter 21 and the slave inverter 22 to the overall control panel 23.

  In the above-described embodiment, the automatic operation control device for the pump that alternately operates two pumps in parallel has been described. be able to. In this case, the target pressure of the inverter that controls the operation of each pump is set differently, and an operation instruction is output from the overall control panel 23 to each inverter so that a plurality of pumps are operated alternately in parallel. Also good.

The figure which shows the structure of the apparatus concerning one embodiment of this invention. The figure which shows the driving | running characteristic of the apparatus. The flowchart for demonstrating operation | movement of the main machine pump of the apparatus. The flowchart for demonstrating operation | movement of the subordinate machine pump of the apparatus. The top view of the apparatus. The front view of the apparatus.

Explanation of symbols

       11 ... Main pump, 13 ... Sub pump, 15 ... Communication pipe, 21 ... Main machine inverter, 22 ... Sub machine inverter, 23 ... Overall control panel.

Claims (4)

A main pump,
When discharge pressure of the main pump is reduced to the starting pressure and the first inverter to control the discharge pressure of the main pump to the target pressure P1 constant,
A sub pump in which the main pump and the discharge port are connected to its own discharge port through a communication pipe;
A second inverter that controls the target pressure P2 (<P1) to be constant when the discharge-side pressure of the slave pump decreases to the starting pressure;
An automatic operation control apparatus for a pump, comprising: an overall control unit that outputs an operation command to the first and second inverters and controls alternate parallel operation of the main pump and the sub pump .   A pressure sensor and a flow rate sensor are connected to the discharge ports of the main pump and the sub pump, respectively. The first inverter and the second inverter are connected to the pump based on signals from the corresponding pressure sensor and flow rate sensor. 2. The automatic operation control apparatus for a pump according to claim 1, wherein the operation is performed at a constant target pressure by performing a small water stop / restart operation and a parallel disassembly operation. A plurality of pumps in which each discharge port is connected via a communication pipe;
An inverter provided for each pump that controls the target pressure to be set to a different value for each pump when the discharge side pressure of each pump drops to the starting pressure;
An automatic operation control apparatus for a pump, comprising: an overall control unit that controls operation of each inverter to control alternate parallel operation of each pump.   A pressure sensor and a flow rate sensor are connected to the discharge port side of each pump, and each inverter has a low water amount stoppage, restart, parallel solution based on signals from the corresponding pressure sensor and flow rate sensor. 4. The automatic operation control apparatus for a pump according to claim 3, wherein the operation is performed in a row to perform a constant target pressure operation.

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