JPH10288164A - Pump operation controller - Google Patents

Abstract

PROBLEM TO BE SOLVED: To save space as a pump unit by separately providing a converter part and an inverter part. SOLUTION: A converter part 17 converting commercial AC power supply into DC and an inverter part 18 converting DC voltage outputted from this converter part 17 into AC voltage are separately arranged. A pump 11, the converter part 17 and the inverter part 18 are arranged on a common base 20. Further, the pump 11, the converter part 17 and the inverter part 18 are covered by a common pump cover 21. Thus, the converter part 17 and the inverter part 18 can be installed in an empty gap of the base 20 by separating the converter part 17 and the inverter part 18 and arranging the converter part 17 and the inverter part 18 together with the pump 11 on the base 20. Therefore, saving space as a pump unit is possible, as compared with a case in which the converter part 17 and the inverter part 18 are arranged on a common control panel.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pump operation control device for automatically controlling the operation of a pump using an inverter.

[0002]

2. Description of the Related Art An automatic water supply apparatus for pumping drinking water stored in a water storage tank or the like by a pump and supplying water to each house has been widely used.

[0003]

In order to control the pump with an inverter, a large control panel is required because an inverter with a converter function is used. Automatic feed water pumps for commercial operation require separate control panels, electric motors, and pumps depending on the single-phase, three-phase, and differences in power supply voltage and power supply frequency. Did not.

[0004] The present invention has been made in view of the above points, and its object is to provide a large control panel without requiring a large control panel.
Moreover, it is an object of the present invention to provide a versatile pump operation control device even if the type of power supply changes.

[0005]

According to a first aspect of the present invention, there is provided a pump operation controller for converting a commercial power supply into a direct current, and a converter disposed separately from the converter. Inverter that converts DC output from AC into AC
And a pump whose operation is controlled by the inverter.

The pump operation control device according to claim 2 is
The converter, the inverter and the pump according to claim 1 are arranged on a common base.

[0007] The pump operation control device according to claim 3 is:
The converter, the inverter and the pump according to claim 1 or 2 are covered by a common cover.

[0008] The pump operation control device according to claim 4 is:
A pressure detecting means for detecting a pressure of the fluid discharged from the pump; and a flow rate detecting means for detecting a flow rate of the fluid discharged from the pump, wherein the inverter section includes the pressure detecting means. And a control means for controlling the discharge pressure of the pump to a target pressure based on a signal from the flow rate detection means.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram showing a configuration of a unit of the automatic water supply device. 1 (A) is a horizontal sectional view of a unit of the automatic water supply device, and FIG. 1 (B) is an A of FIG. 1 (A).
It is the perspective view seen from the side.

1A and 1B, reference numeral 10 denotes a housing, 11 denotes a pump provided in the housing 10, 12 denotes a suction port of the pump 11, 13 denotes a discharge port of the pump 11, and 14 denotes a pump. An electric motor for driving 11; an accumulator 15 for storing a compressed fluid discharged from the pump 11;
Is a flow rate pressure detecting device for detecting the flow rate and pressure of the compressed fluid discharged from the pump 11, 17 is a converter for converting a commercial AC power supply to DC, and 18 is output from the converter section 17. An inverter for converting a DC voltage to an AC voltage. The inverter section 18 is a motor 14
Operating frequency is controlled.

As described above, the converter section 17 and the inverter section 18 are arranged separately. Further, the pump 11
The converter unit 17 and the inverter unit 18 are arranged on one common base 20.

Further, the pump 11, the converter section 17 and the inverter section 18 are covered with one common pump cover-21. Thus, the converter unit 17 and the inverter
Since the converter unit 18 is separated from the converter unit 18 and is arranged on one base 20 together with the pump 11, the converter unit 17 and the inverter unit 18 are installed in the gaps of the base 20. It is possible to Therefore, as compared with the case where the converter and the inverter are installed on a common control panel, space can be saved as a pump unit.

The converter 17 also generates a large amount of heat from a noise filter, a reactor, a capacitor, and the like.
By dividing the heat generating components into the inverter section 18 and the converter section 17, the heat radiation effect can be efficiently performed.

Further, by separating the converter section 17 and the inverter section 18, the pump section including the inverter section and the electric motor is used as a common part, and the converter section is provided with a voltage doubler function and the like. By changing to a power supply, it is possible to cope with a difference in power supply between a single-phase power supply and a three-phase power supply.

Next, the electrical wiring of each component shown in FIG. 1 will be described with reference to FIG. In FIG. 2, reference numeral 30 denotes a commercial AC power supply. The AC power output from the commercial AC power supply 30 is sent to a converter section 31 and converted into a DC voltage. The converter unit 31 also has a doubler function. This DC voltage is input to the inverter 18. The inverter 18 has a flow rate / pressure detecting device 1
The operation frequency to be output to the pump 14 by inputting the flow rate and the pressure detected in 6 is determined and output.

The inverter section 18 controls the flow of FIG.
The processing shown in the chart is performed. Next, an embodiment of the present invention configured as described above will be described. First, the inverter 18 determines whether the pressure P of the compressed fluid discharged from the pump 11 output from the flow pressure detector 16 is smaller than the starting pressure (step S1).

If it is determined "YES" in step S1, the pump 11 is started (step S1).
2). Then, the inverter 18 determines the operating frequency of the pump 11 so that the discharge pressure P of the pump 11 becomes the target pressure PS2 (step S3).

Then, it is determined whether the flow rate I detected by the flow rate pressure detecting section 16 is smaller than the small water amount Io (step S4). If the determination in step S4 is "YES", it is determined that there is no demand for fluid, and the pump 11 is stopped (step S5).

If "NO" is determined in step S4, the process in step S3 is repeated. In this way, the pump 1 is controlled by the inverter 18.
The first automatic start / stop operation is performed.

Incidentally, after the processing of step S5 is completed, the processing of step S1 and thereafter is repeated.
As described above, the discharge pressure of the pump 11 is set to the target pressure P
Control to keep S2 constant is performed.

[0021]

According to the present invention, since the converter section and the inverter section are provided separately, space can be saved as the pump unit. According to the fourth aspect of the present invention, an automatic water supply process can be performed using the device of the first aspect. According to the fifth aspect of the present invention, it is possible to cope with a difference in power supply between a single-phase power supply, a three-phase power supply, and 100V and 200V.

[Brief description of the drawings]

FIG. 1 is a view showing an automatic water supply unit according to an embodiment of the present invention.

FIG. 2 is a diagram showing electric wiring in the unit.

FIG. 3 is a diagram showing a control flow of an inverter unit.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 ... Pump 12 ... Suction port 13 ... Discharge port 14 ... Electric motor 15 ... Accumulator 16 ... Flow rate pressure detection device 17 ... Converter part 18 ... Inverter part

Claims (5)

[Claims] A converter for converting a commercial power supply into a direct current; and an inverter disposed separately from the converter and for converting a direct current output from the converter into an alternating current. A pump operation control device comprising: a pump whose operation is controlled by the inverter unit. 2. The pump operation control device according to claim 1, wherein said converter, said inverter and said pump are arranged on one common base. 3. The pump operation control device according to claim 1, wherein the converter, the inverter and the pump are covered by a common cover. 4. A pressure detecting means for detecting a pressure of a fluid discharged from the pump, and a flow rate detecting means for detecting a flow rate of the fluid discharged from the pump, wherein the inverter has the pressure. 2. The pump operation control device according to claim 1, further comprising control means for controlling a discharge pressure of the pump to a target pressure based on a signal from the detection means and the flow rate detection means. 5. The pump operation control device according to claim 1, wherein said converter has a voltage doubler function.