JP2005307784A - Control device for submerged pump - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a control device for a submerged pump, for pumping up hot spring water with stable pressure, adapting the frequency or the magnitude of power supply voltage, and suppressing influence of noise or surge. <P>SOLUTION: The control device for a submerged pump comprises: the submerged pump 32; a transforming means 27 for transforming input alternating voltage; an inverter 21 receiving output voltage of the transforming means 27 to perform a variable speed control of an operational speed of the submerged pump; and a control means 22 controlling operation of the inverter 21. A motor surge suppressing filter 31 is disposed to a motor cable which connects the inverter 21 and the submerged pump 32. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a submersible pump control device that controls the operation of a submersible pump that pumps hot water from a hot spring, for example.

2. Description of the Related Art A control device in which a submersible pump is inserted into a hot spring well to pump up the hot spring is widely known (see, for example, Patent Document 1).
JP-A-8-126389

  Hot springs contain gas and steam, so the pressure is not stable. For this reason, it was difficult to pump up the hot spring at a stable pressure.

  Hot springs are scattered throughout the country. For this reason, the frequency of the power supply voltage supplied to the submersible pump controller or the magnitude of the power supply voltage differs depending on the region. Accordingly, it is desired that the submersible pump control device also adapts to such a situation.

  Moreover, the submersible pump is connected via a motor cable from a control device installed on land. Therefore, the motor cable used for the submersible pump becomes long, resulting in a problem that the influence of noise and surge is large.

  The present invention has been made in view of the above, and its purpose is to pump hot springs at a stable pressure, adapt to the frequency or magnitude of the power supply voltage, and further suppress the effects of noise and surge. An object of the present invention is to provide a control device for a submersible pump.

The invention of claim 1 is a submersible pump, a transformer means for transforming an input AC voltage,
An output voltage of the transformer means is input, and variable speed means for variablely controlling the operation speed of the submersible pump, and control means for controlling the operation of the variable speed means, the variable speed means and the submersible pump are provided. The motor cable connecting between the two is provided with a motor surge suppression filter.

  The invention according to claim 2 is characterized in that the control means according to claim 1 has a rewritable memory, and the operation of the submersible pump is controlled by this program.

  A third aspect of the invention is characterized in that a display device is connected to the control means according to the first aspect, and the display state of the display device is variable according to a command from the control means.

  According to a fourth aspect of the invention, the variable speed means according to any one of the first to third aspects is an inverter.

  According to the invention described in claim 1, since the variable speed control is performed by the variable speed means of the submersible pump, for example, when the hot spring is pumped by the submersible pump, Hot water can be supplied. Furthermore, radiation noise and microsurge can be suppressed by the motor surge suppression filter.

  According to the invention described in claim 2, since the program for controlling the variable speed means is stored in the rewritable memory, the program can be easily executed even when the number of external sensors input to the control means is increased. It can be dealt with by changing.

  According to the third aspect of the present invention, the operation state of the submersible pump control device can be displayed on the display device by a command from the control means.

  According to the invention described in claim 4, by using an inverter as the variable speed means, even when the magnitude or frequency of the power supply voltage changes, for example, when the hot spring is pumped up with a submersible pump, It can be pumped up at a stable pressure and heated to the destination. Further, when starting the operation of the submersible pump, it is possible to suppress the starting current of the submersible pump and mechanical wear during starting by gradually increasing the operating frequency supplied to the submersible pump. On the other hand, when stopping the operation of the submersible pump, the operating frequency supplied to the submersible pump can be gradually lowered to suppress the water hammer generated in the submersible pump and extend the life of the piping and the pump unit.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1A is a front view of a submersible pump control panel according to an embodiment of the present invention, and FIG. 1B is a front view of the submersible pump control panel according to the embodiment with the front door opened. It is.

  In FIG. 1A, 11 and 12 are front doors for covering the front surface of the submersible pump control panel. A display window 13 is provided above the front door 11. Inside the display window 13, a display unit 14 connected to an inverter 21 described later, a first display 15 and a second display 16 composed of liquid crystal, and an operation switch 23 described later are provided.

  In FIG. 1B, 21 is an inverter (INV) as variable speed means, 22 is a PC (programmable sequencer) as control means, and X2 is an outlet.

  Next, a detailed circuit diagram of the submersible pump control panel will be described with reference to FIGS. In FIG. 2, the PC 22 is configured around a CPU 22a. A flash ROM (Read Only Memory) 22b and a RAM (Random Access Memory) 22c are connected to the CPU 22a. The flash ROM 22b stores a control program shown in the flowchart of FIG. 8 for controlling the operation of the submersible pump. Therefore, the program stored in the flash ROM 22a can be rewritten.

  The PC 22 is connected to the first display 15 and the second display 16 described above. 23 is an operation switch of the submersible pump control panel, 23a is an operation switch for selecting whether the operation of the pump is "automatic", "manual", or "stop", and 23b is an operation pressure of the submersible pump. It is a pressure switch to detect. By the way, when the operation switch 23a is set to “automatic”, the submersible pump 32 is activated when the pressure switch 23b is turned on, and the submersible pump 32 is stopped automatically when the pressure switch 23b is turned off. When the operation switch 23a is set to “manual”, the underwater pump 32 is forcibly activated.

  Reference numeral 23c denotes a terminal for outputting a signal indicating that the well 42 is full or drought.

  The inverter 21 is connected to the PC 22 via the signal line 24. The PC 22 outputs the operating frequency of the inverter 21 through this signal line 24.

  Reference numeral 25 denotes a three-phase AC power source of AC200V, 50Hz or 60Hz. The R, S, and T phases of the three-phase AC power supply 25 are connected to the lightning arresters LA1 and LA2 through a small circuit breaker 26.

  Further, the R phase, S phase, and T phase of the three-phase AC power supply 25 are connected to the primary side of the first transformer 27, the second transformer 28, and the third transformer 29. Note that the first transformer 27 may be connected to the secondary side of the inverter 21.

  The first transformer 27 boosts AC200V input to the primary side to AC400V and outputs it to the secondary side.

  The second transformer 28 converts AC200V input to the primary side into AC200V at the same pressure on the secondary side, and outputs it between the L and N terminals of the PC 22.

  The third transformer 29 steps down the AC200V input to the primary side to AC100V and outputs it to the outlet X2 connected to the secondary side.

  The secondary side of the first transformer 27 is connected to the R, S, and T terminals of the inverter 21 via the leakage breaker ELB and the filter NF01.

  The inverter 21 is mainly composed of a microprocessor (not shown), and the microprocessor performs the processing shown in the flowchart of FIG. A temperature sensor 30 for detecting the ambient temperature of the display unit 14 and the inverter 21 is connected to the inverter 21.

  Further, the U, V, and W terminals of the inverter 21 are connected to the X, Y, and Z terminals of the submersible pump 32 via the filter NF02 and the motor surge suppression filter 31. The inverter 21 is connected to a direct current reactor DCL. The submersible pump 32 is, for example, a pump for pumping up hot springs.

  Next, a detailed configuration of the motor surge suppression filter 31 will be described with reference to FIG. The motor surge suppression filter 31 is connected to a reactor L for surge suppression for each phase. A series circuit of a resistor R and a capacitor C is connected between the phases.

  The secondary output of the second transformer 28 shown in FIG. 3 is output between the terminals a and b of FIG. The circuit of FIG. 3 has an optional function. That is, as an optional function, the temperature detection type ventilation fan 41 including FAN1 to FAN4 and the well 42 are detected to be full or drought, or the hot water storage tank 43 is detected to be full or drought.

  The full / dry signal of the well 42 is output to the interface 44, and the full / dry signal of the hot water tank 43 is output to the interface 45.

  One end of the temperature detection type ventilation fan 41 is connected to the terminal b, and the other end is connected to the terminal a through the electronic thermal THR.

  5 to 7 show terminals provided in the submersible pump control panel.

  In FIG. 5, 200V AC power is input to the R, S, and T terminals. A motor surge suppression filter 31 is connected to the U, V, and W terminals of the inverter 21.

  FIG. 6 is a diagram showing pressure switch input terminals PS1 and PS2, a common terminal A1, a failure terminal A2, and a drought terminal A3 terminal provided in the submersible pump control panel.

  FIG. 7 shows the relationship between the U, V, W, X, Y, and Z terminals provided on the submersible pump control panel, the submersible pump 32, and the control panel.

  Next, the operation of the embodiment of the present invention configured as described above will be described. First, when the operator activates the submersible pump control device, the operator sets the operation switch 23a from the “stop” position to the “automatic” position or the “manual” position.

  The PC 22 performs the process shown in the flowchart of FIG. That is, it is determined whether or not the operation switch 23a is turned on (step S1). Here, the operation switch 23a being on means that the operation switch 23a is set to the "automatic" position or the "manual" position.

If “YES” is determined in the determination in step S1, an operation command is output to the inverter 21 (step S2).

  That is, the inverter 21 performs control to perform “automatic” or “manual” operation set by the operation switch 23a. For example, when “automatic” operation is set by the operation switch 23a, the following automatic operation control is performed. That is, when the pressure sensor 23b is on, the submersible pump 32 is activated, and when the pressure sensor 23b is off, the submersible pump 32 is deactivated. When the submersible pump 32 is activated, the operation frequency of the inverter 21 is variably controlled. Here, when the process first proceeds to step S2, the operation frequency of the inverter 21 is gradually increased to the target operation frequency. Therefore, the submersible pump 32 can be activated softly. Thereby, suppression of the starting current of the submersible pump 32 and mechanical wear during starting can be suppressed.

In addition, the PC 22 receives a full / dry signal output from the level sensor 22a. If the signal output from the level sensor 22a is abnormal, the PC 22
An alarm is displayed on the first display 15 or the second display 16. At this time, the display color of the first display 15 or the second display 16 may be changed according to the severity of the alarm. The PC 22 performs such display control (step S3).

  By the way, when stopping this submersible pump control apparatus, the operation switch 23a is set to a "stop" position. In this case, “NO” is determined in the determination in step S1, and the stop process is performed on the software (step S4). That is, the operating frequency output to the inverter 21 before the operating switch 23a is set to the “stop” position is gradually reduced, and finally the operating frequency is set to “0”.

  Thus, when the operation switch 23a is set to the “stop” position, the operation frequency of the submersible pump 32 is gradually lowered, so that the submersible pump 32 can be softly stopped.

  Thereby, the water hammer which generate | occur | produces in the submersible pump 32 can be suppressed, and the lifetime of piping or a pump unit can be extended.

  Incidentally, the inverter 21 performs the processing shown in the flowchart of FIG. That is, the inverter 21 performs constant speed and variable speed operation of the submersible pump 32 based on the operation command from the PC 22 (step S11).

  Then, it is determined whether the ambient temperature of the inverter 21 detected by the temperature sensor 30 is abnormal (step S12).

  While it is determined “NO” in the determination in step S12, the process in step S11 is repeatedly performed.

  On the other hand, when it is determined “YES” in the determination in step S12, a process for stopping the operation of the inverter 21 is performed (step S13).

  Then, the operating voltage V, operating current I, and operating frequency Hz of the submersible pump 32 when the inverter 21 is stopped are displayed on the display unit 14.

  In this way, the control panel has its own temperature sensor 30, and when the ambient temperature of the inverter 21 detected by this temperature sensor 30 becomes an abnormal temperature, the cooling fan is operated or the inverter 21 is operated. Since the operation is stopped, failure of the inverter 21 can be prevented in advance.

  By the way, the input three-phase AC power supply (AC200V) is boosted to AC400V by the first transformer 27 and then input to the R, S, and T terminals of the inverter 21 via the leakage breaker ELB and the filter NF01. In the inverter 21, the submersible pump 32 is driven at an operation frequency according to an operation command output from the PC 22 after being once converted into a DC voltage.

  Therefore, the input three-phase AC power supply (AC200V) is 50 Hz or 60 Hz. However, since it is input to the inverter 21, the operation of the submersible pump 32 is performed regardless of the frequency of the three-phase AC power supply. Can be controlled.

  Further, by connecting the circuit shown in FIG. 3 between a and b in FIG. 1 as an option, not only the pressure control of the submersible pump but also the liquid level control or the temperature detection type ventilation fan 41 is added. be able to. Thus, a circuit can be added according to a customer's request.

  Further, the output of the inverter 21 is connected to the X, Y, and Z terminals of the submersible pump 32 through the filter NF02 and the motor surge suppression filter 31. This motor surge suppression filter 31 combines a large-capacity resistor R in addition to a coil L and a capacitor C for removing high frequency components. The resistor R functions to convert a high frequency component that cannot be absorbed by the capacitor C into heat even when the carrier frequency of the inverter 21 is set high to prevent motor noise.

  Thus, since the motor surge suppression filter 31 is connected between the inverter 21 and the submersible pump 32 as described above, when the 400 V class submersible pump 32 is driven, the inverter 21 and the submersible pump 32 Microsurge that becomes a problem when the motor cable connecting the cables is routed over a long distance can be suppressed.

  In the above-described embodiment, 200 V is used as the AC power supply, but the present invention is not limited to this.

FIG. 1A is a front view of a submersible pump control device according to an embodiment of the present invention, and FIG. 1B is a front view of the submersible pump control device according to the embodiment with the front door opened. . The circuit diagram which shows a part of control circuit in the submersible pump control apparatus which concerns on the same embodiment. The circuit diagram which shows a part of control circuit in the submersible pump control apparatus which concerns on the same embodiment. The circuit diagram which shows a part of control circuit in the submersible pump control apparatus which concerns on the same embodiment. The circuit diagram which shows a part of control circuit in the submersible pump control apparatus which concerns on the same embodiment. The circuit diagram which shows a part of control circuit in the submersible pump control apparatus which concerns on the same embodiment. The circuit diagram which shows a part of control circuit in the submersible pump control apparatus which concerns on the same embodiment. The flowchart which shows the control content of PC of the submersible pump control apparatus which concerns on the same embodiment. The flowchart which shows the control content of the inverter of the submersible pump control apparatus which concerns on the same embodiment.

Explanation of symbols

11, 12 ... Front door, 14 ... First display, 15 ... Second display,
22 ... PC, 22a ... flash ROM, 22b ... RAM, 25 ... 3-phase AC power supply.

Claims (4)

Submersible pumps,
Transform means for transforming the input AC voltage;
An output voltage of the transformer means is input, variable speed means for variable speed control of the operation speed of the submersible pump,
Control means for controlling the operation of the variable speed means,
A submersible pump control apparatus, wherein a motor surge suppression filter is provided in a motor cable connecting between the variable speed means and the submersible pump. 2. The submersible pump control device according to claim 1, wherein the control unit has a rewritable memory, and the operation of the submersible pump is controlled by the program. 2. The submersible pump control device according to claim 1, wherein a display device is connected to the control means, and a display state of the display device is changed according to a command from the control means. The submersible pump control device according to any one of claims 1 to 3, wherein the variable speed means is an inverter.

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