JPH11210670A - Land pump device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To automatically supply water on the land using a motor having a good efficiency by arranging a DC brushless motor for driving a pump, a variable speed operating means for operating the motor with variable speed, and a control means for controlling the variable speed operating means. SOLUTION: In an inverter 16, three phase ac voltage having an operating frequency according to an operating frequency outputted from a CPU 20 is outputted to a DC brushless motor 15 m. In the CPU 2O, the operating frequency is controlled so as to prevent voltage outputted from the inverter 16 from attaining setting voltage or more. Voltage outputted from the inverter 16 is controlled so as to prevent the voltage from attaining a setting value or more, and thereby, the DC brushless motor 15m is protected. When voltage is supplied to the DC brushless motor 15m, the motor 15m is driven. As a result, a pump 15 is driven, water accumulated in a well 11 is supplied through a water feeding pipe 13, a pump 15, and a water feeding piping 22.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a land-based pump device for automatically supplying water by mounting a pump on land.

[0002]

2. Description of the Related Art In recent years, a pump used in an automatic water supply device is controlled by an inverter to control the rotation speed of the pump so that the discharge pressure of the pump is controlled to be constant. As described above, an induction motor has been used as a motor for driving a pump used in an automatic water supply device.

[0003]

The reason why the induction motor is used as the drive source of the pump is that commercial operation is often performed. The reason that the inverter is used for the automatic water supply device is that energy-saving operation becomes possible by using the inverter.

However, because induction motors are inefficient,
Even if the induction motor was operated for energy saving, the entire automatic water supply device could not be operated for energy saving.

[0005] The present invention has been made in view of the above points, and an object of the present invention is to provide a land-based pump device capable of automatically supplying water on land using a motor having high motor efficiency.

[0006]

According to a first aspect of the present invention, there is provided a land-based pump apparatus comprising: a DC brushless motor for driving a pump; a variable speed operation means for operating the DC brushless motor at a variable speed; Control means for controlling the driving means.

According to a second aspect of the present invention, there is provided a land-based pump device comprising discharge pressure detecting means for detecting a discharge pressure of the pump,
The control means controls the variable speed operation means so that the discharge pressure of the pump detected by the discharge pressure detection means becomes a constant target pressure.

In accordance with a third aspect of the present invention, there is provided a land-based pump device comprising discharge flow rate detecting means for detecting a discharge flow rate of the pump, wherein the control means detects a discharge pressure of the pump detected by the discharge pressure detecting means. The pump is started when the pressure is equal to or lower than the starting pressure, and after the pump is started, the variable speed operation means is controlled so that the discharge pressure of the pump becomes a target pressure.
When the discharge flow rate of the pump detected by the discharge flow rate detecting means is equal to or less than the stop flow rate, the pump is stopped.

According to a fourth aspect of the present invention, there is provided a land-based pump device wherein an AC power supply is connected to the variable speed operation means via a noise filter or a harmonic suppression device. According to a fifth aspect of the present invention, there is provided a land-based pump device, wherein the control means controls the output voltage of the variable-speed operation means so as not to exceed a set voltage.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is an overall configuration diagram of the automatic water supply device. In FIG. 1, reference numeral 11 denotes a well. Water 12 is stored in the well 11.

One end of a water supply pipe 13 is installed so as to be immersed in the water 12 of the well 11. The other end of the water supply pipe 13 is connected to a suction port of a pump 15 via a check valve 14.

The rotation of the pump 15 is controlled by a motor 15m. The operating frequency of the motor 15m is controlled by an inverter (variable speed operating means) 16.

Reference numeral 17 denotes a three-phase AC power supply. This three-phase AC power supply 17 is connected to an inverter 16 via a noise filter 18.
Is supplied as power. Further, the inverter 16
Is connected to a DC reactor 19 for suppressing a harmonic reactor.

The inverter 16 is connected to a CPU (central processing unit) 20 as control means. C
The PU 20 is composed of a microcomputer and its peripheral circuits. The CPU 20 determines the operating frequency of the inverter 16.

A water supply pipe 22 provided with a flow rate sensor (FS) 21 is connected to a discharge port of the pump 15. The flow rate sensor 21 detects the flow rate I discharged from the discharge port of the pump 15.

A pressure tank 23 is connected to the water supply pipe 22 at a position downstream of the flow sensor 21. Further, a pressure sensor (PS) 24 is connected to a position further downstream than a position where the pressure tank 23 is connected to the water supply pipe 22. The pressure sensor 24 detects the discharge pressure P of the pump 15.

The flow rate I discharged from the pump 15 detected by the flow rate sensor 21 is output to the CPU 20. Further, the discharge pressure P of the pump 15 detected by the pressure sensor 24 is output to the CPU 20.

The CPU 20 determines the operating frequency of the inverter 16 so that the discharge pressure of the pump 15 detected by the pressure sensor 24 becomes constant at the target pressure.
Further, the CPU 20 starts the pump 15 when the discharge pressure of the pump 15 detected by the pressure sensor 24 is equal to or lower than the starting pressure. The operation frequency of the inverter 16 is controlled, and the pump 1 is detected by the flow sensor 21.
When the discharge flow rate I of Step 5 is equal to or lower than the stop flow rate, the pump 15 is stopped.

Further, the CPU 20 controls the operation frequency of the inverter 16 so that the output voltage of the inverter 16 does not exceed the set voltage even if the input voltage of the inverter 16 changes.

Next, the operation of the embodiment of the present invention configured as described above will be described. The three-phase AC power supplied from the AC power supply 17 is supplied to the noise filter 18. The noise filter 18 removes three-phase AC noise output from the three-phase AC power supply 17.

In the inverter 16, the three-phase AC voltage is rectified. Here, since the DC reactor 19 is connected to the inverter 16, harmonics in rectifying the three-phase AC voltage are suppressed.

The inverter 16 outputs a three-phase AC voltage having an operation frequency corresponding to the operation frequency output from the CPU 20 to the DC brushless motor 15m. Here, the CPU 20 controls the operating frequency so that the voltage output from the inverter 16 does not exceed the set voltage.

As described above, the DC brushless motor 15m is protected by controlling the voltage output from the inverter 16 not to exceed the set voltage. When the voltage is supplied to the DC brushless motor 15m, the motor 15m is driven.

Then, the pump 15 is driven and the well 11
The accumulated water is supplied through the water supply pipe 13, the pump 15, and the water supply pipe 22. CPU 20 is a pressure sensor 24
If the discharge pressure of the pump 15 detected in step (1) is equal to or lower than the starting pressure, the pump 15 is started. After the pump 15 is started, the operating frequency of the inverter 16 is controlled so that the discharge pressure of the pump 15 becomes constant at the target pressure. Is controlled, and when the discharge flow rate I of the pump 15 detected by the flow rate sensor 21 is equal to or less than the stop flow rate, control is performed to stop the pump 15.

As described above, since the DC brushless motor 15m is used as the motor 15m for driving the pump 15, energy saving operation can be performed as compared with the case where an induction motor is used.

Further, a motor 15 for driving the pump 15
Since the DC brushless motor 15m is used as m, the size of the motor can be reduced. further,
Since the DC brushless motor 15m is used as the motor 15m for driving the pump 15, the size of the motor can be reduced. In particular, the higher the rotation speed, the smaller the device can be.

Further, a motor 15 for driving the pump 15
Since the DC brushless motor 15m is used as m, high-speed rotation is facilitated, and the operation speed can be set. In this case, the motor can be operated at a certain set rotational speed by constantly measuring the rotational speed of the motor 15 using a magnetic sensor.

[0028]

According to the first aspect of the present invention, since a DC brushless motor is used as a motor for driving the pump, energy saving operation can be performed as compared with the case where an induction motor is used.

Further, D is used as a motor for driving the pump.
Since the C brushless motor is used, the size of the electric motor can be reduced. Further, since a DC brushless motor is used as a motor for driving the pump, the size of the motor can be reduced. In particular, the higher the rotation speed, the smaller the device can be.

Further, D is used as a motor for driving the pump.
Since the C brushless motor is used, high-speed rotation is facilitated, and the operation speed can be set. According to the second aspect of the present invention, a DC brushless motor is used as a motor for driving the pump, and the discharge pressure of the pump can be set to the target pressure constant operation.

According to the third aspect of the present invention, the pump can be operated automatically using a DC brushless motor as the motor for driving the pump. According to the fourth aspect of the invention, it is possible to eliminate the influence of power supply noise by the noise filter and suppress power supply harmonics.

According to the fifth aspect of the present invention, the DC brushless motor can be protected by controlling the voltage output from the inverter so as not to exceed the set voltage.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a system configuration of a land-based pump device according to an embodiment of the present invention.

[Description of Signs] 11 ... well, 15 ... pump, 15m ... DC brushless motor, 20 ... CPU.

Claims (5)

[Claims] 1. A DC brushless motor for driving a pump, variable speed operation means for driving the DC brushless motor at a variable speed, and control means for controlling the variable speed operation means. Onshore pumping equipment. 2. The variable speed operation device according to claim 1, further comprising a discharge pressure detecting means for detecting a discharge pressure of the pump, wherein the control means controls the variable speed operation so that the discharge pressure of the pump detected by the discharge pressure detecting means becomes a constant target pressure. 2. The onshore pump device according to claim 1, wherein the means is controlled. 3. A discharge flow rate detecting means for detecting a discharge flow rate of the pump, wherein the control means activates the pump when a discharge pressure of the pump detected by the discharge pressure detecting means is equal to or lower than a starting pressure. When the pump is started, the variable speed operation means is controlled so that the discharge pressure of the pump becomes the target pressure constant after the pump is started, and the discharge flow rate of the pump detected by the discharge flow rate detection means is equal to or less than the stop flow rate. 2. The land-based pump device according to claim 1, wherein said pump is stopped. 4. The land-based pump device according to claim 3, wherein an AC power supply is connected to the variable speed operation means via a noise filter or a harmonic suppression device. 5. The land-based pump device according to claim 4, wherein said control means controls the output voltage of said variable speed operation means so as not to be higher than a set voltage.