JP2017048795A - Water supply unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To avoid suspension of water supply as much as possible when an abnormal value is detected during operation, by not stopping as a failure but preferentially continuing the operation with lowered performance.SOLUTION: A water supply unit comprises: an electric motor 20 for variable speed driving of a vortex pump 12 by an inverter; an electric part 50 to drive an electric motor 20; a converter part 61 to convert the AC from a commercial power source to the DC; a storage part 80 to store a maximum rotation speed of the electric motor 20, a reduction warning voltage of a DC voltage of the converter part 61, a voltage monitoring time, an acceleration time of the electric motor 20, and a target discharge pressure of the vortex pump 12; and a control part 70. When the DC voltage of the converter part 61 has reduced to the reduction warning voltage or less, the control part controls to: if the electric motor 20 is being accelerated, stop acceleration and set a new acceleration time longer than the present acceleration time in the storage part 80; if it is in constant speed operation and has not reached the maximum rotation speed, reduce the target discharge pressure by a prescribed value and set it in the storage part 80; and, if it is in the constant speed operation and has already reached the maximum rotation speed, reduce the maximum rotation speed by a prescribed value and set it in the storage part 80.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a water supply unit that performs variable speed operation by an inverter.

  2. Description of the Related Art A small water supply unit that performs variable speed operation using an inverter is known as a water supply unit that is used for watering potable water, pumping well water, and the like (see, for example, Patent Document 1).

  Since small water supply units are required to have high self-priming performance and small flow rate / high head characteristics, eddy current pumps are often used in the pump section. The water supply unit in which the vortex pump is used is configured as shown in FIG. 4, for example. That is, the water supply unit 100 includes a base 110, a self-priming chamber 120 provided on the base 110 for pumping up well water when the power is turned on, and a flow rate detection unit 130 provided on the self-priming chamber 120. The pressure detector 140 provided on the outlet side of the flow rate detection unit 130, the eddy current pump 150, the electric motor 160 that drives the eddy current pump 150, the accumulator 170, and the electrical unit 180 that controls each part are provided. ing.

  The electrical unit 180 is an electric system that drives and controls each unit (motor, rotor position detection Hall IC, pressure detection unit signal input unit, flow rate detection unit input unit, temperature detection unit signal input unit, operation unit, micro A computer, a converter for converting a commercial power source into a direct current, a control unit including a drive circuit and peripheral circuits constituting an inverter, and the like) are mounted.

Japanese Patent No. 4991652

  The water supply unit described above has the following problems. That is, the small water supply unit may be used in a poor environment. For example, when installed at a distance farther than the power source, the power supply voltage may drop, or the electrolytic capacitor capacity of the converter unit may decrease with high temperature and humidity and long-term use.

  In addition, since the discharge pressure is constant, frequent acceleration / deceleration of the rotational speed is repeated as the flow rate changes. When the rotational speed is accelerated, the DC voltage of the converter section tends to decrease as the operating current increases. However, the decrease in the DC voltage occurs due to the combination of the above-described decrease in the power supply voltage and the decrease in the capacity of the electrolytic capacitor. Due to the insufficient voltage, the rotational speed at which the target discharge pressure is generated may not be maintained due to the heat generation / torque shortage of the motor.

  On the other hand, there are also grounding sites where the power supply voltage is 110% or more of the rating, and the DC voltage of the converter unit is constantly 110% or more of the design value, and the DC power of the converter unit is reduced by the regenerative energy of the brushless motor during deceleration. The voltage rises further. For this reason, there was an overvoltage state, and there was a problem that the life of electrolytic capacitors, rectifier circuits, and output transistors was reduced.

  When such an undervoltage is detected, the acceleration is temporarily stopped during acceleration, and the operation frequency is temporarily reduced during constant speed operation to suppress the voltage drop. If it did not rise or recover during this period, the pump was stopped due to an undervoltage failure. In this case, water cannot be supplied and water is cut off.

  In addition, when an overvoltage condition is detected, the deceleration is temporarily stopped during deceleration and the operating frequency is temporarily reduced during constant speed operation to suppress overcurrent, but without changing the control parameters. When retry detection was performed and overvoltage detection continued, the pump operation was stopped as an overvoltage failure. In this case, the water is similarly cut off.

  In addition, when operating for a long time outdoors, such as in midsummer, where sunlight is strong, if the temperature inside the electrical component rises above the allowable value, the pump operation stops and the temperature inside the electrical component cools below a certain value. Then, he resumed driving. In this case, in addition to the water cutoff during cooling, the operation is performed under the same conditions at the time of re-operation, so there is a high possibility that the water will fall again.

  That is, the maintenance of the performance of the water supply unit, such as the pumping performance, the constant pressure accuracy, and the transient response is given priority, and it is detected as a failure caused by the use environment and the operating condition. However, the problems in the use environment as described above cannot be easily improved, and in the case of a small water supply unit, it is relatively inexpensive, so there are many cases in which the situation is seen by replacing a new one. When installed, it took a lot of time and effort to replace the product alone.

  Then, an object of this invention is to provide the water supply unit which can avoid water cutoff as much as possible.

  In order to solve the above problems and achieve the object, the water supply unit of the present invention is configured as follows.

  A pump, an electric motor that drives the pump at a variable speed by an inverter, an electrical component that drives the electric motor, a converter unit that converts an AC power source into direct current, and a maximum rotation of the electric motor incorporated in the electrical component The storage unit stores the speed, the DC voltage drop warning voltage of the converter unit, the voltage monitoring time, the acceleration time of the electric motor, the target discharge pressure of the pump, and the DC voltage of the converter unit is the voltage monitoring time. When the voltage drops below the lower warning voltage, the electric motor is stopped if the electric motor is accelerating, and a new acceleration time obtained by extending the acceleration time is set in the storage unit. When the maximum rotational speed is not reached during operation, the target discharge pressure is reduced by a certain value and set in the storage unit, and the electric motor is at the maximum speed during constant speed operation. A control unit that performs control to reduce the maximum rotation speed by a fixed value and set the storage unit when the rotation speed has reached, and to repeat the above operation until the DC voltage exceeds a drop warning voltage; and It is characterized by having.

  A pump, an electric motor that drives the pump at a variable speed by an inverter, an electrical component that drives the electric motor, a converter unit that converts an AC power source into direct current, and a maximum rotation of the electric motor incorporated in the electrical component The storage unit for storing the speed, the DC voltage rising warning voltage, the voltage monitoring time, the electric motor deceleration time, and the DC voltage of the converter unit are equal to or higher than the rising warning voltage during the voltage monitoring time. If the electric motor is decelerating, the motor stops accelerating and sets a new deceleration time obtained by extending the deceleration time in the storage unit, and performs the above operation until the DC voltage falls below the rising warning voltage. And a control unit that performs repetitive control.

  A pump, an electric motor that drives the pump with an inverter at a variable speed, an electric component that drives the electric motor, and an electric component that is incorporated in the electric component, and the maximum rotation speed of the electric motor and an increase warning of the current flowing through the electric motor A storage unit that stores current, current monitoring time, acceleration time of the electric motor, and target discharge pressure of the pump, and a current flowing through the electric motor rises above the rising warning current during the current monitoring time If the electric motor is accelerating, the acceleration is stopped and a new acceleration time obtained by extending the acceleration time is set in the storage unit. The electric motor is operating at a constant speed and has reached the maximum rotation speed. If not, the target discharge pressure is reduced by a certain value and set in the storage unit.If the electric motor is operating at a constant speed and has reached the maximum rotation speed, The rolling speed performs control to set in the storage unit by reducing a predetermined value, the current is characterized in that it comprises a control unit which controls to repeat the above operation until drops below the elevated warning current.

  A pump, an electric motor that drives the pump by an inverter at a variable speed, an electric component that drives the electric motor, and an electric component that is incorporated in the electric component, the maximum rotation speed of the electric motor, the rising warning temperature of the electric component, the temperature When the temperature of the monitoring unit, the acceleration time of the electric motor, the target discharge pressure of the pump, and the temperature of the electrical component rise above the rising warning temperature, the electric motor reaches the maximum rotation speed. If not, the target discharge pressure is reduced by a certain value and set in the storage unit, and if the electric motor has reached the maximum rotation speed, the maximum rotation speed is reduced by a certain value and the storage unit And a control unit that performs control to repeat the above operation until the temperature of the electrical component falls below the rising warning temperature.

  A pump, an electric motor that drives the pump at a variable speed by an inverter, an electrical component that drives the electric motor, a converter unit that converts an AC power source into direct current, and a maximum rotation of the electric motor incorporated in the electrical component Speed, DC voltage drop warning voltage and rise warning voltage, voltage monitoring time, current rising warning current flowing through the electric motor, current monitoring time, acceleration time and deceleration time of the electric motor, target of the pump When the DC voltage of the storage unit that stores the discharge pressure and the rising warning temperature of the electrical unit and the converter unit drops below the lower warning voltage during the voltage monitoring time, the electric motor may be accelerating. In addition, the acceleration is stopped and a new acceleration time obtained by extending the acceleration time is set in the storage unit, and the electric motor is operating at a constant speed and the maximum rotation speed is set. If the electric motor does not reach the maximum rotation speed, the target discharge pressure is reduced by a certain value and set in the storage unit. Is controlled to set a constant value to the storage unit, the first control unit performs the first control to repeat the above operation until the DC voltage exceeds the drop warning voltage, and the DC voltage of the converter unit, If the electric motor is decelerating during the voltage monitoring time, if the electric motor is decelerating, the acceleration is stopped and a new deceleration time obtained by extending the deceleration time is set in the storage unit. When the second control unit that performs the second control to repeat the above operation until the DC voltage falls below the rising warning voltage, and the current flowing through the electric motor rises above the rising warning current during the current monitoring time, Above When the dynamic motor is accelerating, the acceleration is stopped and a new acceleration time obtained by extending the acceleration time is set in the storage unit, and the electric motor is operating at a constant speed and has not reached the maximum rotation speed. Reduces the target discharge pressure by a fixed value and sets it in the storage unit.If the electric motor reaches a maximum rotation speed during constant speed operation, the maximum rotation speed is decreased by a fixed value and the A third control unit that performs control to be set in the storage unit and repeats the above-described operation until the current drops below the rising warning current; and a temperature of the electrical component rises above the rising warning temperature If the electric motor has not reached the maximum rotational speed, the target discharge pressure is reduced by a certain value and set in the storage unit, and the electric motor has reached the maximum rotational speed. The maximum rotation speed A fourth control unit for performing a fourth control for performing a control to reduce the degree to a certain value and setting the storage unit in the storage unit, and repeating the above operation until the temperature of the electrical unit falls below the rising warning temperature, and the storage unit And a controller that counts the number of times of the first control to the fourth control and stores a predetermined count number, and stops driving the electric motor when the predetermined count number is exceeded. It is characterized by having.

  According to the present invention, water cutoff can be avoided as much as possible.

The longitudinal cross-sectional view which shows the water supply unit which concerns on one Embodiment of this invention. The graph which shows the control action in the same water supply unit with the relationship between a flow volume and discharge pressure. Explanatory drawing which shows the relationship between the control action in the same water supply unit, and a failure cause. The top view which shows another example of a water supply unit.

  FIG. 1 is a longitudinal sectional view showing a water supply unit 10 according to an embodiment of the present invention, FIG. 2 is a graph showing a control operation in the water supply unit 10 in relation to the flow rate and the discharge pressure, and FIG. 3 is a control operation in the water supply unit 10. It is explanatory drawing which shows the relationship with a failure cause.

  In the description, Rmax is the maximum number of revolutions of the electric motor 20, Ta is the acceleration time, Pa is the target discharge pressure, Tg is the deceleration time, Vc is the DC voltage applied to the converter unit 61, Va1 is the drop warning voltage, and Va2 is The rising recovery voltage, Vg1 is the rising warning voltage, Vg2 is the lowering recovery voltage, Ic is the DC current flowing through the converter unit 61, Im is the current flowing through the electric motor 20, H1 is the rising warning temperature, and H2 is the lowering recovery temperature. .

  As shown in FIG. 1, the water supply unit 10 includes a base 11, a spiral pump 12 provided on the base 11, an electric motor 20 that drives the spiral pump 12, and a flow provided on the discharge side of the spiral pump 12. A path casing 30, a sensor unit 35 provided on the upper part of the channel casing 30, a discharge port 36 provided on the discharge side of the sensor unit 35, an accumulator 40 connected to the discharge port 36, and an electrical unit 50 are provided. A self-priming chamber 31 and a gas-liquid separation plate 32 are provided in the flow path casing 30.

  The rated voltage of the electric motor 20 is, for example, AC 200V, and the rated voltage of the converter unit 61 is DC 280V.

  A flow rate switch 37 is provided in the sensor unit 35. The flow switch 37 detects the position of the float 37a containing the magnet by the lead switch 37b. The stop flow rate detected by the flow switch 37 is set to approximately 4 L / min in consideration of the capacity of the accumulator and the stop time. Further, reference numeral 38 in FIG. 1 denotes a pressure sensor, and the output of the pressure sensor 38 is input to a control unit 70 described later.

  The electrical unit 50 includes a drive unit 60 that drives the electric motor 20, a control unit 70 that controls the operation of the drive unit 60, and a storage unit 80 that stores various values. The drive unit 60 includes a converter unit 61 that converts alternating current from a commercial power source into direct current. Further, reference numeral 51 in FIG. 1 denotes a temperature sensor that measures the temperature of the electrical component 50. The output of the temperature sensor 51 is input to the control unit 70. The storage unit 80 is provided with a counter 82 that counts the number of safety control operations described later.

  The control unit 70 includes a voltage detection unit that detects a DC voltage of the converter unit 61, a current detection circuit that detects a current flowing through the electric motor 20, a pressure detection circuit that detects a pressure value from the pressure sensor 38, and a rotation speed of the electric motor 20. A rotational speed detection circuit is provided for detecting. The control unit 70 performs predetermined control based on the above-described circuits and external input values based on a program incorporated in advance. When detecting an abnormal value, which will be described later, first to fourth safety control operations (first to fourth controls) are performed. The control unit 70 functionally includes a first control unit that performs the first control, a second control unit that performs the second control, a third control unit that performs the third control, and a fourth control that performs the fourth control. Although it is divided into the control part, it is a common part as a part.

  The storage unit 80 stores operation parameters, that is, initial values of the maximum rotation speed Rmax, acceleration time Ta, target discharge pressure Pa, and deceleration time Tg of the electric motor 20. The maximum rotation speed Rmax, acceleration time Ta, target discharge pressure Pa, and deceleration time Tg, which are these operating parameters, are changed as will be described later, but can be always returned to initial values at an appropriate timing by the reset button 81. . Further, the lower warning voltage Va1 (for example, DC280V × 60%), the rising recovery voltage Va2 (for example, DC280V × 70%), the rising warning voltage Vg1 (for example, DC280V × 120%), the lower recovery voltage Vg2 (for example, DC280V × 110%), electric motor 20 rising warning current Ia1 (for example, maximum rated current × 120%), H1 for rising warning temperature (for example, 110 ° C.), and H2 for decreasing Recovery temperature (for example, 90 ° C.), voltage monitoring time Tv (for example, 3 seconds), current monitoring time Te (for example, 10 ms), temperature monitoring time Th (for example, 10 seconds) are water supply This is a fixed value unique to the unit.

Further, the counter 82 accumulates the number of first to fourth safety control operations performed when the abnormal value is detected. Hereinafter, the first to fourth safety control operations performed when the abnormal value is detected will be described.
<First safety control operation>
At the time of detecting an abnormal value in which the DC voltage Vc of the converter unit 61 of the electrical unit 50 drops below the lower warning voltage Va1 for a predetermined voltage monitoring time Tv, the following first safety control operation is performed and the counter 82 is Advance one. In other words, if the electric motor 20 is accelerating, the electric motor 20 is stopped and the acceleration time is extended from the next time (for example, 0.5 seconds → 1 second), and the new acceleration time is stored in the storage unit 80. The If the maximum rotational speed is not reached during constant speed operation, the target discharge pressure Pa is reduced (for example, 0 → Δ1 m). Further, when the maximum rotational speed Rmax is reached during constant speed operation, the maximum rotational speed Rmax is reduced (for example, maximum rotational speed Rmax → Δ40 rpm). Otherwise, no changes are made.

  By performing the first safety control operation, when the DC voltage Vc of the converter unit 61 exceeds the predetermined voltage monitoring time Tv and the rising recovery voltage Va2, the first safety control operation is interrupted, and the operation parameter at that time Thus, the operation of the electric motor 20 is resumed. At this time, the operation is continued in a state where the performance is lower than the expected performance.

  On the other hand, even if the first safety control operation is performed, if the DC voltage Vc of the converter unit 61 falls below the drop warning voltage Va1, the first safety control operation is performed again and the counter 82 is advanced. In addition, the extension of the acceleration time is, for example, 0.5 seconds → 1 second → 2 seconds → 3 seconds → 4 seconds → 5 seconds. The reduction of the target discharge pressure Pa is, for example, 0 → Δ1m → Δ2m → Δ3m → Δ4m → Δ5m. Furthermore, reduction of the maximum rotation speed Rmax is, for example, 0 → Δ40 rpm → Δ80 rpm → Δ120 rpm → Δ160 rpm → Δ200 rpm.

  Such an operation is repeated, and when the counter 82 reaches a predetermined number of times (for example, 5 times), it is determined that the water supply unit 10 has failed and stops.

In FIG. 2, M1 represents the relationship between the target discharge pressure (initial) and the flow rate, L1 represents the maximum rotational speed of the electric motor 20, and S1 represents the current value flowing through the electric motor 20. When the target discharge pressure is reduced to the target discharge pressure M2 by the first safety control operation (QM in FIG. 2), it is reduced to the maximum rotational speed L2 (QL in FIG. 2) accordingly, and the current S2 (QS in FIG. 2).
<Second safety control operation>
At the time of detecting an abnormal value in which the DC voltage Vc of the converter unit 61 of the electrical unit 50 abnormally increases during the predetermined voltage monitoring time Tv, the following second safety control operation is performed and the counter 82 is Advance one. In other words, if the electric motor 20 is decelerating, it is decelerated and stopped, and a calculation for extending the deceleration time from the next time (for example, 0.5 seconds → 1 second) is performed, and the new acceleration time is stored in the storage unit 80. Further, when the vehicle is in constant speed operation or stopped, it is determined as a failure and stopped.

  By performing the second safety control operation, when the DC voltage Vc of the converter unit 61 falls below the predetermined voltage monitoring time Tv and the drop recovery notification voltage Vg2, the second safety control operation is interrupted, The operation of the electric motor 20 is restarted according to the operation parameter. At this time, the operation is continued in a state where the performance is lower than the expected performance.

On the other hand, if the DC voltage Vc of the converter 61 exceeds the rising warning voltage Vg1 even after performing the second safety control operation, the second safety control operation is performed again and the counter 82 is advanced. The extension of the deceleration time is, for example, 0.5 seconds → 1 second → 2 seconds → 3 seconds → 4 seconds → 5 seconds. Such an operation is repeated, and when the counter 82 reaches a predetermined number of times (for example, 5 times), it is determined that the water supply unit 10 has failed and stops.
<Third safety control operation>
At the time of detecting an abnormal value in which the current Im flowing through the electric motor 20 rises above the rising warning current Ia1 during a predetermined current monitoring time Te in the current detection circuit of the electrical component 50, the following third safety control operation is performed. And advance the counter 82 by one. That is, if the electric motor 20 is accelerating, the acceleration is stopped and the acceleration time is extended from the next time (for example, 0.5 seconds → 1 second), and the new acceleration time is stored in the storage unit 80. If the maximum rotational speed is not reached during constant speed operation, the target discharge pressure Pa is reduced (for example, 0 → Δ1 m). Further, when the maximum rotational speed Rmax is reached during constant speed operation, the maximum rotational speed Rmax is reduced (for example, 0 → Δ40 rpm).

  By performing the third safety control operation, when the current Im flowing through the electric motor 20 falls below the rising warning current Ia1 for a predetermined current monitoring time Te, the third safety control operation is interrupted and the operation parameters at that time are To resume operation. At this time, the operation is continued in a state where the performance is lower than the expected performance.

  On the other hand, even if the third safety control operation is performed, if the current Im flowing through the electric motor 20 exceeds the rising warning current Ia1 for a predetermined current monitoring time Te, the third safety control is performed again at regular intervals. Operate and advance counter 82. In addition, the extension of the acceleration time is, for example, 0.5 seconds → 1 second → 2 seconds → 3 seconds → 4 seconds → 5 seconds. The reduction of the target discharge pressure Pa is, for example, 0 → Δ1m → Δ2m → Δ3m → Δ4m → Δ5m. Furthermore, reduction of the maximum rotation speed Rmax is, for example, 0 → Δ40 rpm → Δ80 rpm → Δ120 rpm → Δ160 rpm → Δ200 rpm.

  Such an operation is repeated, and when the counter 82 reaches a predetermined number of times (for example, 5 times), it is determined that the water supply unit 10 has failed and stops.

In addition, although the detection target of the current value is the motor current Im flowing through the electric motor 20, the DC current Ic of the converter unit 61 may be detected.
<Fourth safety control operation>
When an abnormal value is detected in which the temperature of the component parts (control board, output element, heat radiating part, etc.) of the electrical component 50 rises above the predetermined temperature monitoring time Th and the rising warning temperature H1, the following fourth safety control operation is performed. And advance the counter 82 by one. That is, when the maximum rotation speed has not been reached, the target discharge pressure Pa is reduced (for example, 0 → Δ1 m). Further, when the maximum rotational speed Rmax is reached during constant speed operation, the maximum rotational speed Rmax is reduced (for example, 0 → Δ40 rpm).

  By performing this fourth safety control operation, when the temperature of the component parts of the electrical equipment section 50 falls below the lowering recovery temperature H2, the fourth safety control operation is interrupted and the operation is continued according to the operation parameters at that time. At this time, the operation is continued in a state where the performance is lower than the expected performance.

  On the other hand, even if the fourth safety control operation is performed, if the temperature of the component parts of the electrical component 50 exceeds the rising warning temperature H1, the fourth safety is again performed at regular intervals (for example, every 10 seconds). A control operation is performed and the counter 82 is advanced. The reduction of the target discharge pressure Pa is, for example, 0 → Δ1m → Δ2m → Δ3m → Δ4m → Δ5m. Furthermore, reduction of the maximum rotation speed Rmax is, for example, 0 → Δ40 rpm → Δ80 rpm → Δ120 rpm → Δ160 rpm → Δ200 rpm.

  Such an operation is repeated, and when the counter 82 reaches a predetermined number of times (for example, 5 times), it is determined that the water supply unit 10 has failed and stops.

  When the above-described abnormal value detection occurs in combination, the cause of the abnormality is determined along the table shown in FIG. For example, when the target discharge pressure is subtracted by the first safety control operation and the counter 82 reaches 5 times and the drive of the electric motor 20 is stopped, either the overcurrent, the undervoltage, or the substrate temperature abnormality is the cause. I understand that.

  Similarly, the cause of the rotation speed subtraction, acceleration time increase, and deceleration time increase can be determined if the counter 82 reaches 5 times and the drive of the electric motor 20 is stopped. Become.

  As described above, in the water supply unit 10, when an abnormal value is detected, the operation is not stopped immediately, but the operation parameter for control is changed to try to return to the normal value. At this time, with regard to the pump performance, for example, by changing operating parameters such as acceleration time and deceleration time, target discharge pressure, maximum rotation speed, etc., transient response and constant pressure accuracy will be reduced, and target pressure will be reduced. The deviation from is also increased. In addition, the pumping performance is reduced by reducing the target discharge pressure and the maximum rotation speed. However, these inconveniences are minor and acceptable as compared to water outage.

  For example, when the target discharge pressure is reduced five times as shown in FIG. 2, the target discharge pressure is reduced from 25 m to 20 m. As a result, the motor current is reduced, and undervoltage and overcurrent can be avoided.

  Also, unlike the method of reducing the limit current value, the pressure detection circuit and the rotation speed detection circuit have higher detection accuracy than the current detection circuit, so that the constant pressure characteristic is maintained as seen in the graph of FIG. effective.

  In addition, when the temperature in the electrical unit 50 rises to an allowable value or more, the target discharge pressure at the time of restarting the operation or the maximum number of revolutions is reduced after the operation of the electric motor 20 is stopped, so that the temperature rise is suppressed. Thus, it is possible to prevent a failure.

  Furthermore, when the electric motor 20 finally stops and the water supply unit 10 itself or parts are replaced, the cause of the failure is easily clarified depending on the type of the safety control operation, and the necessary parts replacement is required. Also, changes such as design changes are facilitated.

  The present invention is not limited to the above embodiment. For example, any water supply unit that performs variable speed operation with an inverter can be applied. That is, it can be used for a medium-sized water supply unit used in an apartment or the like, or a large-sized water supply unit having a plurality of pumps used in an air conditioning / cooling facility or the like. In addition to the vortex pump, the pump to be used may be a submersible pump or a positive displacement pump in addition to a vortex pump, a multistage turbine pump, and a jet pump. Of course, various modifications can be made without departing from the scope of the present invention.

  DESCRIPTION OF SYMBOLS 10 ... Water supply unit, 12 ... Eddy current pump, 20 ... Electric motor, 50 ... Electrical equipment part, 60 ... Drive part, 61 ... Converter part, 70 ... Control part, 80 ... Memory | storage part.

Claims (14)

A pump,
An electric motor that drives the pump at a variable speed by an inverter;
An electric part for driving the electric motor, a converter part for converting alternating current from a commercial power source incorporated in the electric part into direct current, a maximum rotational speed of the electric motor, and a voltage applied to the electric motor are predetermined voltages. A storage unit for storing a lower warning voltage indicating a lower value, a voltage monitoring time, an acceleration time of the electric motor, and a target discharge pressure of the pump;
When the DC voltage of the converter unit drops below the lower warning voltage during the voltage monitoring time, the electric motor is accelerated and stopped if the motor is accelerating, and a new acceleration time that extends the acceleration time is set. When the electric motor is operating at a constant speed and has not reached the maximum rotational speed, the target discharge pressure is reduced by a certain value and set in the memory unit. When the maximum rotational speed is reached during high speed operation, the maximum rotational speed is reduced by a certain value and set in the storage unit, and the above operation is repeated until the DC voltage exceeds the drop warning voltage. A water supply unit comprising: a control unit that performs the operation. The storage unit counts the number of operations and stores a predetermined count number,
The water supply unit according to claim 1, wherein the control unit stops driving the electric motor when the operation exceeds the predetermined count number.   The control unit determines that a failure occurs when the DC voltage of the converter unit drops below the lower warning voltage during the voltage monitoring time and the electric motor is stopped. The water supply unit according to claim 1 or 2. The storage unit further stores an increase recovery voltage higher than the decrease warning voltage,
The control unit holds the maximum rotation speed of the electric motor, the acceleration time of the electric motor, and the target discharge pressure of the pump in the storage unit when the DC voltage of the converter unit exceeds the rising recovery voltage. The water supply unit according to any one of claims 1 to 3. A pump,
An electric motor that drives the pump at a variable speed by an inverter;
An electric part for driving the electric motor, a converter part for converting alternating current from a commercial power source incorporated in the electric part into direct current, a maximum rotational speed of the electric motor, and a voltage applied to the electric motor are predetermined voltages. A storage unit for storing a rising warning voltage indicating a higher value, a voltage monitoring time, a deceleration time of the electric motor;
When the DC voltage of the converter unit rises above the rising warning voltage during the voltage monitoring time, if the electric motor is decelerating, the electric motor is accelerated and stopped, and a new deceleration time obtained by extending the deceleration time is provided. A water supply unit comprising: a control unit configured to perform control to set the storage unit and repeat the above operation until the DC voltage falls below a rising warning voltage. The storage unit counts the number of operations and stores a predetermined count number,
The water supply unit according to claim 5, wherein the control unit stops driving the electric motor when the operation exceeds the predetermined count number.   The control unit stops the operation when the DC voltage of the converter unit rises above the rising warning voltage during the voltage monitoring time, or when the electric motor is operating at a constant speed or is stopped. The water supply unit according to claim 5 or 6, characterized by the above. The storage unit further stores a falling recovery voltage lower than the rising warning voltage,
The controller holds the maximum rotation speed of the electric motor, the acceleration time of the electric motor, and the target discharge pressure of the pump in the storage unit when the DC voltage of the converter unit falls below the falling recovery voltage. The water supply unit according to any one of claims 5 to 7. A pump,
An electric motor that drives the pump at a variable speed by an inverter;
The electric part for driving the electric motor, the motor current detection circuit incorporated in the electric part, the maximum rotation speed of the electric motor, the rising warning current of the current flowing through the electric motor, the current monitoring time, the current monitoring time, If the electric motor is accelerating when the current flowing in the electric motor and the storage unit that stores the acceleration time and the target discharge pressure of the pump rises above the rising warning current during the current monitoring time The acceleration is stopped, and a new acceleration time obtained by extending the acceleration time is set in the storage unit. When the electric motor is operating at a constant speed and does not reach the maximum rotation speed, the target discharge pressure is kept constant. The value is reduced and set in the storage unit. When the electric motor reaches the maximum rotation speed during constant speed operation, the maximum rotation speed is reduced by a certain value and set in the storage unit. Your was carried out, the water supply unit, characterized in that a control unit which controls to repeat the above operation until the current falls below the elevated warning current. The storage unit counts the number of operations and stores a predetermined count number,
The water supply unit according to claim 9, wherein the controller stops driving the electric motor when the operation exceeds the predetermined count number. A pump,
An electric motor that drives the pump at a variable speed by an inverter;
An electrical component that drives the electric motor;
A storage unit that is incorporated in the electrical unit and stores a maximum rotation speed of the electric motor, a rising warning temperature of the electrical unit, a temperature monitoring time, an acceleration time of the electric motor, and a target discharge pressure of the pump; and the electrical unit When the temperature of the electric motor has risen above the rising warning temperature and the electric motor has not reached the maximum rotational speed, the target discharge pressure is reduced by a certain value and set in the storage unit, When the electric motor has reached the maximum rotation speed, control is performed to reduce the maximum rotation speed by a fixed value and set it in the storage unit, and perform the above operation until the temperature of the electrical unit falls below the rising warning temperature. A water supply unit comprising a control unit that performs repeated control. The storage unit counts the number of operations and stores a predetermined count number,
The water supply unit according to claim 11, wherein the control unit stops driving the electric motor when the operation exceeds the predetermined count number. The storage unit further stores a descent recovery temperature lower than the increase warning temperature,
The control unit holds the maximum rotational speed of the electric motor and the target discharge pressure of the pump in the storage unit when the temperature of the electrical unit is lower than the lowering recovery temperature. Or the water supply unit of 12. A pump,
An electric motor that drives the pump at a variable speed by an inverter;
An electrical unit that drives the electric motor, a converter unit that converts alternating current from a commercial power source incorporated in the electrical unit into direct current, a maximum rotational speed of the electric motor, and a voltage drop warning applied to the electric motor Voltage and rising warning voltage, voltage monitoring time, rising warning current of current applied to the electric motor, current monitoring time, acceleration time and deceleration time of the electric motor, target discharge pressure of the pump, rising warning of the electrical equipment section A storage unit for storing the temperature;
When the DC voltage of the converter unit drops below the lower warning voltage during the voltage monitoring time, the electric motor is accelerated and stopped if the motor is accelerating, and a new acceleration time that extends the acceleration time is set. When the electric motor is operating at a constant speed and has not reached the maximum rotational speed, the target discharge pressure is reduced by a certain value and set in the memory unit. When the maximum rotational speed has been reached during high speed operation, the maximum rotational speed is controlled to be reduced by a certain value and set in the storage unit, and the above operation is repeated until the voltage exceeds the drop warning voltage. A first control unit for controlling
When the DC voltage of the converter unit rises above the rising warning voltage during the voltage monitoring time, if the electric motor is decelerating, the electric motor is accelerated and stopped, and a new deceleration time obtained by extending the deceleration time is provided. A second control unit configured to perform the second control that is set in the storage unit and repeats the above operation until the voltage falls below the rising warning voltage;
When the current flowing through the electric motor rises above the rising warning current during the current monitoring time, if the electric motor is accelerating, the electric motor is accelerated and stopped, and a new acceleration time that extends the acceleration time is set. When the electric motor is operating at a constant speed and has not reached the maximum rotational speed, the target discharge pressure is reduced by a certain value and set in the memory unit. If the maximum rotational speed has been reached during high speed operation, the maximum rotational speed is reduced by a fixed value and set in the storage unit, and the above operation is repeated until the current becomes less than the rising warning current. A third control unit for performing third control;
When the temperature of the electrical unit rises above the rising warning temperature, if the electric motor has not reached the maximum rotation speed, the target discharge pressure is reduced by a certain value and set in the storage unit, When the electric motor has reached the maximum rotation speed, control is performed to reduce the maximum rotation speed by a fixed value and set it in the storage unit, and perform the above operation until the temperature of the electrical unit falls below the rising warning temperature. A fourth control unit for performing fourth control to be repeated;
Control that is provided in the storage unit, counts the number of times of the first control to the fourth control, stores a predetermined count number, and stops driving the electric motor when the predetermined count number is exceeded And a water supply unit.