JP7081985B2 - Control unit for controlling water supply equipment, and water supply equipment - Google Patents

Description

The present invention relates to a control unit for controlling a water supply device and a water supply device.

In recent years, there has been an increasing demand for energy saving in water supply devices that supply liquids to water supply targets such as buildings. In response to such a demand, a water supply device provided with a switchable button that can be operated by a user and that changes the control lift curve of the pump according to the operation of the switchable button has been proposed (see Patent Document 1). In this water supply device, the operation panel has an energy saving display unit indicating the degree of energy saving, and the user can confirm the selection of the current pump control lift curve on the operation panel.

Further, a water supply device capable of switching a power supply source between a commercial power source and a capacitor is known. In this water supply device, the power supply source is switched to a capacitor when the commercial power supply fails. In such a water supply device, when power is supplied from the condenser, power consumption by the pump is smaller than when power is supplied from a commercial power source in order to realize long-term operation. (See Patent Document 2).

Japanese Patent No. 5914365 Japanese Unexamined Patent Publication No. 2014-138497

Water supply by the pump is restricted while low power control such as energy saving operation or power failure operation is executed in the water supply device. Specifically, during low power control, the water supply device limits the discharge pressure of the pump, so even if the faucet (for example, a faucet) of the building is opened, only a small amount of water will be discharged compared to normal times, and the user will It may not be possible to use a sufficient amount of water. In addition, if the power outage lasts for a long time and the capacitor is consumed and the power is insufficient, the water is cut off. In such cases, users who could not use enough water when low power control or water outage was canceled by canceling energy-saving operation or recovering from a power outage will use a larger amount of water than usual. Is expected. For example, in a building containing multiple dwelling units, it is assumed that the resident will use a large amount of water, such as storing water in a bathtub in case of subsequent low power control or power outage. As described above, a water supply device that can cope with the temporarily increasing amount of water supply in the building after low power control and cancellation of water outage is desired.

On the other hand, when low power control is being executed, even if the faucet (for example, a faucet) of the building is opened, only a small amount of water will come out, so it is assumed that the user is using water by opening the faucet wide. Will be done. It is also assumed that the user keeps the faucet wide open after the condenser is exhausted and water is cut off. The water supply device has a pressure sensor for measuring the discharge pressure in order to realize automatic water supply, and the pump is started when the output value of the pressure sensor drops to a predetermined starting pressure. Then, during the operation of the pump, the estimated end pressure constant control or the discharge pressure constant control is performed based on the output value of the pressure sensor. More specifically, the pump is driven by the drive based on the feedback control for setting the deviation between the output value of the pressure sensor and the preset target pressure to 0. When the water faucet is wide open during low power control of the water supply device or during a power failure, if the water cutoff is canceled by canceling the low power control or recovering from the power failure, a large amount of water suddenly unintentional to the user is released from the water faucet. coming out. This is in feedback control
This is because it is generally set so that optimum control is performed during steady operation, and if the deviation is unexpectedly large, the pump accelerates rapidly and accelerates to the maximum speed. In addition, water supply devices are generally installed in each building. Therefore, in an area where buildings in the city center are densely packed, a plurality of water supply devices are installed in the area. In an area where buildings are densely populated, if low power control or water outage of multiple water supply devices is canceled all at once due to power outage recovery, etc., the water main pressure in the area may decrease due to a rapid increase in water supply. I am concerned. In addition, since the rapid acceleration of the pump consumes a large amount of electric power, there is a concern that the electric power in the area will be insufficient.

The present invention has been made in view of the above-mentioned circumstances, and is appropriately performed when low power control that reduces power consumption and water interruption due to power shortage are canceled in a water supply device that supplies liquid to a water supply target such as a building. One of the purposes is to propose a control unit and a water supply device capable of supplying water.

(Form 1) According to Form 1, a control unit for controlling a water supply device including a pump for pressurizing and transferring water and a drive unit for driving the pump is proposed, and the control unit is set as a control mode. The control unit has a first control mode and a second control mode in which power consumption is smaller than that of the first control mode, and the control unit of the pump when switching from the second control mode to the first control mode. The pump is controlled by a switching control process in which the change in output is different from that of the first control mode.
According to the first embodiment, when the second control mode is switched to the first control mode, a switching control process in which the change in the output of the pump is different from that of the first control mode is performed, and then the first control mode is switched to. .. As a result, the water supply device can appropriately supply water to a sudden change in the amount of water supply when the water cutoff due to low power control or power shortage is released.

(Form 2) According to the second embodiment, in the control unit of the first embodiment, the pump is controlled in the switching control mode, and in the switching control mode, the discharge flow rate of the pump is faster than that of the first control mode. It has a sudden change control mode that changes to. According to the second embodiment, it is possible to cope with a sudden increase in the amount of water supply when the water cutoff due to low power control or power shortage is released. Further, by switching to the first control mode after the drive unit is controlled by the sudden change control mode, water can be supplied quickly.

(Form 3) According to the third embodiment, in the control unit of the second embodiment, in the sudden change control mode, the control unit has a tangential slope of the control lift curve at a predetermined flow rate as a control numerical value of the pump. A control lift curve larger than the slope of the tangent of the standard control lift curve in the first control mode, and the rate of change between predetermined flow rates is higher than the set pressure of the pump when driving the pump in the first control mode. Also greater than the set pressure, the number of pumps in operation that is greater than the number of pumps in operation in the first control mode, and the proportional gain used to set control commands to the pump in the first control mode. Also set at least one of the larger proportional gains. According to the third embodiment, it is possible to quickly respond to the increase in the amount of water supply when the water outage due to low power consumption or power shortage is released.

(Form 4) According to the fourth embodiment, in the switching control process, the pump is controlled in the switching control mode, and in the switching control mode, the discharge flow rate of the pump is slower than that in the first control mode. It has a slow change control mode that changes to. According to the fourth embodiment, when the water cutoff due to the low power control or the power shortage is released, the water supply amount and the power amount can be suppressed, and the unintended change in the output of the pump can be suppressed and the water supply can be appropriately supplied. ..

(Form 5) According to Form 5, in the control unit of Form 4, in the slow change control mode, the control unit has the inclination of the tangent line of the control lift curve at a predetermined flow rate as a control numerical value of the pump. A control lift curve smaller than the slope of the tangent of the standard control lift curve in the first control mode, and the rate of change between predetermined flow rates is higher than the set pressure of the pump when driving the pump in the first control mode. Less than the set pressure, the number of pumps operating less than the number of pumps operating in the first control mode, and the proportional gain used to set the control commands to the pump in the first control mode. Also set at least one of the smaller proportional gains. According to the fifth embodiment, when the water cutoff due to the low power control or the power shortage is released, the water supply amount and the sudden change in the power amount can be suppressed, and the water can be appropriately supplied.

(Form 6) According to the sixth embodiment, in the control units of the second to fifth modes, the control unit has a plurality of the switching control modes, and at least one of the plurality of switching control modes is selected. According to the sixth embodiment, by selecting at least one of the plurality of switching control modes, the control unit is suitable for the switching control process according to the user's request or the situation where the water supply device is placed. Can be supplied with water.

(Form 7) According to the seventh embodiment, in the control units of the first to sixth embodiments, the control unit has a first condition in which a predetermined time elapses in the switching control process, and a second condition in which the pump stops a small amount of water. When at least one of the conditions is satisfied, the switching control process is terminated. According to the seventh embodiment, the mode is automatically switched to the first control mode, so that appropriate water supply can be continued.

(Form 8) According to the eighth aspect, in the control units of the first to fifth embodiments, the control unit has started the switching control process when the pump is operating in the switching control process. The pump is forcibly operated until a predetermined time elapses.

(Form 9) According to the ninth aspect, in the control units of the first to eighth aspects, the control unit has the switching time control process for a longer period in which the drive unit is controlled by the second control mode. To execute.

(Form 10) According to the tenth aspect, in the control units of the first to ninth embodiments, the control unit can display the current control mode and / or the switching control mode by the display, and the current control mode can be displayed. At least one of the duration of the control mode and / and the switching control mode and the estimated time until the current control mode and / and the switching control mode are changed can be displayed.

(Form 11) According to the eleventh aspect, in the control units of the first to tenth aspects, the drive unit can drive the pump by using the first electric power supplied from the commercial power source or the second electric power supplied from the capacitor. The control unit controls the drive unit by the first control mode when the pump is driven by the first electric power, and the second control mode when the pump is driven by the second electric power. Controls the drive unit.

(Form 12) According to the form 12, in the control units of the first to eleventh forms, the control unit controls the pump by the first control mode after the switching control process.

(Form 13) According to the thirteenth form, a water supply device equipped with the control units of the first to twelve forms is proposed.

(Form 14) According to Form 14, a control unit for controlling a water supply device including a pump for pressurizing and transferring water and a drive unit for driving the pump is proposed, and the drive unit is derived from a commercial power source. The pump can be driven by the first electric power supplied or the second electric power supplied from the emergency power source, and the control unit is a control mode in which the pump is driven by the first electric power. It has a control mode and a second control mode in which the pump is driven by the second electric power, and when the control unit switches from the second control mode to the first control mode, a change in the output of the pump changes. The pump is controlled by a switching control process different from that of the first control mode.
According to the fourteenth aspect, when the second control mode is switched to the first control mode, the first control mode is switched after the switching control process, so that the power supplied to the drive unit is changed from the emergency power supply to the commercial power supply. Water can be supplied properly when switched.

(Fifth form 15) According to the form 15, in the control unit of the form 14, in the switching time control process, the pump is controlled in the switching time control mode, and the switching time control mode is more than the first control mode. It has a sudden change control mode in which the discharge flow rate of the pump changes rapidly. According to the fifteenth aspect, when the electric power supplied to the drive unit is switched from the emergency power source to the commercial power source, it is possible to quickly respond to the increase in the amount of water supply. Further, by switching to the first control mode after the drive unit is controlled by the sudden change control mode, water can be appropriately supplied.

(Mode 16) According to the form 16, in the control unit of the mode 14, in the switching control process, the pump is controlled in the switching control mode, and the switching control mode is higher than that of the first control mode. It has a slow change control mode in which the discharge flow rate of the pump changes slowly. According to the sixteenth aspect, when the electric power supplied to the drive unit is switched from the emergency power source to the commercial power source, the change in the water supply amount and the electric power amount can be suppressed, and water can be appropriately supplied.

(Form 17) According to the form 17, in the control unit of the form 15 or 16, the switching time control process has a plurality of the switching time control modes, and at least one of the plurality of switching time control modes can be selected. Is. According to the form 17, the control unit has a plurality of switching control modes (for example, four modes of low output control mode, high output control mode, slow change control mode, and sudden change control mode), and the switching control is performed. Which of the modes is used for switching control, and / or in what combination of the plurality of switching control modes (combination of switching control modes, timing of execution, etc.) is executed. The control unit has at least one switching control mode, and it is possible to select whether or not to execute the switching control mode. As a result, it is possible to appropriately supply water by selecting the control mode at the time of switching according to the request of the user or the situation where the water supply device is placed.

(Form 18) According to the 18th aspect, in the control units of the 14th to 17th forms, the control unit controls the pump by the first control mode after the switching time control process.

(Form 19) According to Form 19, a water supply device equipped with the control units of Forms 14 to 18 is proposed.

It is a figure which shows the schematic structure of the water supply device which concerns on 1st Embodiment. It is a figure which shows a concrete example of the operation panel. It is a figure which shows a plurality of control lift curves stored in a storage part. It is a flowchart which shows an example of the control mode setting process executed by a control unit. It is a flowchart which shows an example of the numerical value setting process for control which is executed by a control part. It is a flowchart which shows an example of the control process in a high output control mode executed by a control unit. It is a flowchart which shows an example of the control process in a low output control mode executed by a control unit. It is a figure which shows an example of the lift curve for standard control, the lift curve for standard control for high output, and the lift curve for standard control for low output. It is a flowchart which shows an example of the control process in a sudden change control mode executed by a control unit. It is a flowchart which shows an example of the control process in a slow change control mode executed by a control unit. It is a figure which shows an example of the lift curve for standard control, the lift curve for standard control for sudden change, and the lift curve for standard control for slow change. It is a flowchart which shows an example of the control mode determination process at the time of switching executed by a control unit. It is a flowchart which shows an example of the control mode setting process at the time of power recovery executed by a control unit. It is a figure which shows the schematic structure of the water supply device which concerns on 2nd Embodiment.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the drawings, the same or corresponding components are designated by the same reference numerals, and duplicate description will be omitted.

(First Embodiment)
FIG. 1 is a schematic view showing a water supply device according to the first embodiment of the present invention. This water supply device is mainly a device for supplying liquid to a building (target of water supply) such as an apartment, an office building, a commercial facility, or a school. In FIG. 1, the water supply device 100 is used in a direct water supply system, and the suction port of the water supply device 100 is connected to the water main which is the water supply source 4 via the introduction pipe 5. However, a water receiving tank system in which the water supply source 4 of the water supply device 100 is a water receiving tank may be used. A water supply pipe 7 is connected to a discharge port of the water supply device 100, and the water supply pipe 7 communicates with a water tap (for example, a faucet) 10 of each building. The water supply device 100 boosts the pressure of water from the water supply source 4 and supplies water to each water tap 10 of the building. Of each of the water taps 10 in the building, the water tap having the maximum piping resistance in the flow path of the liquid discharged from the water supply device 100 is referred to as a water tap 10a at the end.

The water supply device 100 includes a pump 2, a motor 3 as a drive unit for driving the pump 2, and an inverter 20 as a variable speed control means for the pump 2. In this embodiment, the inverter 20 constitutes a control unit 30 together with a control unit 40 described later. Further, the water supply device 100 includes a check valve 22, a flow switch 24, a pressure sensor 26, and a pressure tank 28 on the discharge side (downstream side) of the pump 2.

In the example shown in FIG. 1, two sets of a pump 2, a motor 3, a check valve 22, and a flow switch 24 are provided, and these are provided in parallel. In addition, one set, or three or more sets of pumps 2, motors 3, check valves 22, and flow switches 24 may be provided. By providing the water supply device 100 with a plurality of pumps 2, when some of the pumps 2 become inoperable, the water supply can be continued by another pump 2 that can be operated, and water interruption can be avoided as much as possible.

Further, a backflow prevention device 25 is provided on the upstream side of the plurality of pumps 2. The backflow prevention device 25 is provided in the introduction pipe 5 connected to the suction port of the water supply device 100, and prevents the backflow of water from the water supply device 100 to the water supply source 4. A pressure sensor 21 is provided on the upstream side of the backflow prevention device 25. The pressure sensor 21 is a pressure measuring device for measuring the suction pressure of the pump 2. When the water supply source 4 is a water receiving tank, the pressure sensor 21 may not be provided.

The check valve 22 is provided in a discharge pipe connected to the discharge port of the pump 2 to prevent backflow of water when the pump 2 is stopped. A flow switch 24 is provided on the downstream side (secondary side) of the check valve 22. The flow switch 24 is a flow rate detector that detects that the flow rate of water flowing through the discharge pipe has dropped to a predetermined value, that is, an insufficient amount of water (small amount of water). The flow switch 24 may be provided in the discharge confluence pipe of the pump 2. A pressure sensor 26 and a pressure tank 28 are provided on the downstream side of the flow switch 24 in the discharge pipe. The pressure sensor 26 is a pressure measuring device for measuring the discharge pressure of the pump 2 (hereinafter, the discharge pressure indicates the pressure measured by the pressure sensor 26). The pressure tank 28 is a pressure holder for holding the pressure on the discharge side of the water supply device 100 while the pump 2 is stopped.

The water supply device 100 includes a control unit 40 that controls the water supply operation. As shown in FIGS. 1 and 2A, the control unit 40 includes a storage unit 47, a calculation unit 48, an I / O unit 50, a setting unit 46, and a display unit 49. The setting unit 46 and the display unit 49 are provided on the operation panel 51 of the water supply device 100. The control unit 40 controls the drive of the pump 2 by controlling the motor 3 via the inverter 20. In the present embodiment, the control unit 40 and the inverter 20 are collectively referred to as a "control unit 30".

The setting unit 46 is used to set various setting values used by the control unit 40 for controlling the pump 2 by an external operation. Various set values set in the setting unit 46 are stored in the storage unit 47. As an example, the user is used for the stop pressure Pf, the starting pressure (starting pressure) Ps, the discharge pressure PA at the maximum flow rate, the discharge pressure PB at the deadline operation, and other controls via the setting unit 46. You can enter information.

The display unit 49 functions as a user interface, and various data such as set values stored in the storage unit 47 and the current operating status (operating state) of the pump 2, for example, the current control mode (first control mode, first control mode). The second control mode, switching control mode (high mode, low mode)), operation or stop of the pump 2, operating frequency (rotation speed), current, suction pressure, discharge pressure, input voltage, etc. are displayed. Further, when an abnormality has occurred in the water supply device 100 such as an inverter trip, the display unit 49 notifies the user of the abnormality by lighting an alarm lamp and sounding a buzzer.

FIG. 2A is a diagram showing a specific example of the operation panel. As shown in the figure, the operation panel 51, as a display unit 49, provides information on the operation of the water supply device 100 (for example, discharge pressure, suction pressure and input voltage of the water supply device 100, frequency (rotational speed) of the pump 2, motor 3). 7-segment LED 510 that displays various abnormalities such as current), alarm lamp 511, and display that shows the status (operation / stop / failure) of pump 2, lamp 512a, power consumption level. ECO lamp 512b indicating (ECO level, H, M, L), lamp 512c indicating switching control mode (high / low), lamp indicating the state of the water receiving tank (full / reduced / drought) when having a water receiving tank. It has 512d and a lamp 512e that indicates whether or not the drive power source of the pump 2 is a power storage device 82. Further, the operation panel 51 has a selection button 513 for selecting the pump 2, a test automatic button 514 for switching between test operation and automatic operation of the pump 2, and a buzzer stop and alarm cancellation when an alarm is generated, as a setting unit 46. Alarm release button 515 for, setting button 516 for displaying and changing various setting values, function / monitor button 517 for switching display operation functions, up / down buttons for switching display and increasing / decreasing various setting values. It has 518. Further, the operation panel 51 has an ECO button (operation unit) 519 for setting the power saving operation mode, and an operation stop button 520 for selecting the operation stop of the pump 2. Further, the operation panel 51 has a setting mode for changing various setting values as an operation mode. When the operator presses and holds the setting button 516 for a predetermined time (for example, 1 second), the operation panel 51 enters the setting mode, and various setting values can be displayed and changed.

As the storage unit 47, a ROM, HDD, EEPROM, FeRAM, a non-volatile memory such as a flash memory, and a volatile memory such as RAM are used. In the storage unit 47, various data, for example, data of the calculation result in the calculation unit 48 (operating time, integrated value, etc.), pressure value (suction pressure, discharge pressure), and data used in automatic water supply control (stop pressure Pf). , Starting pressure (starting pressure) Ps, discharge pressure PA at maximum flow rate, discharge pressure PB at deadline operation, set pressure Pt, etc.), data input through the setting unit 46, and input through the I / O unit 50. Data or the like to be output or output through the I / O unit 50 is stored.

A port or the like is used as the I / O unit 50. The I / O unit 50 has a circuit for acquiring the signals of the inverter 20, the pressure sensors 21 and 26, and the signal of the flow switch 24, and sends the acquired signal information to the calculation unit 48. Further, the motor 3 may be provided with a sensor (not shown) for detecting the rotation speed of the motor 3. The I / O unit 50 may acquire the detected rotation speed of the motor 3 via the inverter 20 and send the acquired signal information to the calculation unit 48. However, the rotation speed of the motor 3 is not limited to that detected by the sensor provided in the motor 3, and may be estimated from the output frequency of the inverter 20. In the present embodiment, the pump 2 and the motor 3 are synchronized, and the rotation speed of the pump 2 and the rotation speed of the motor 3 are the same. When a transmission is interposed between the pump 2 and the motor 3, the rotation speed of the pump 2 is determined based on the gear ratio of the transmission (current gear ratio if variable) and the rotation speed of the motor 3. You may get it. Further, the rotation speed of the pump 2 is not limited to the one acquired based on the rotation speed of the motor 3, and may be acquired from a sensor that directly detects the rotation speed of the pump 2. The I / O unit 50 may input / output various signals by communication, or may be connected to an external display 52 having the same function as the operation panel 51. The external display 52 is a display composed of a PDA (Personal Digital Assistant) or the like, and may be connected to the I / O unit 50 wirelessly or by wire such as an NFC (Near Field Communication). The input of set values and various information input from the operation panel 51, the I / O unit 50, the external display 52, and the like to the water supply device 100 are referred to as external inputs.

Further, the I / O unit 50 and the inverter 20 are connected to each other by communication means such as RS422, RS232C, and RS485. Control signals such as various set values, frequency command values, and start / stop signals (operation / stop signals) are sent from the I / O section 50 to the inverter 20, and the actual frequency values and the actual frequency values are sent from the inverter 20 to the I / O section 50. The operating status (operating status) such as the current value is sequentially sent.

An analog signal and / or a digital signal can be used as the control signal transmitted / received between the I / O unit 50 and the inverter 20. For example, an analog signal can be used for the rotation frequency and the like, and a digital signal can be used for the operation stop command and the like.

For example, a CPU is used as the arithmetic unit 48. The calculation unit 48 sets, clocks, and calculates various data for operating the pump 2 based on the program and various data stored in the storage unit 47 and the signal input from the I / O unit 50. And so on.

Subsequently, the automatic water supply control of the water supply device 100 by the control unit 40 (control unit 30) will be described. The control unit 40 drives the pump 2 by the motor 3 based on the feedback control for setting the deviation between the discharge pressure and the preset target pressure SV to 0. When the discharge pressure drops to a predetermined starting pressure Ps while the pump 2 is stopped, the control unit 40 starts the pump 2. Specifically, the control unit 40 issues a command to the inverter 20 to start driving the motor 3. During the operation of the pump 2, control such as estimated terminal pressure constant control or target pressure constant control is performed by the set pressure (set pressure) Pt. Specifically, in the case of constant estimated terminal pressure control, the water supply at the end is supplied using the rotation speed of the pump 2, the discharge pressure PA at the maximum flow rate, and the target pressure control curve based on the discharge pressure PB at the deadline operation. The target pressure (SV) is set so that the pressure of the plug 10a becomes constant. Further, in the case of constant control of the target pressure, the predetermined set pressure Pt is set as the target pressure (SV). Further, the discharge pressure is set to the current pressure (PV). Then, based on the difference between SV and PV, a PI operation using the proportional gain Gp and the integrated gain Gi, or a PID operation using the proportional gain Gp, the integrated gain Gi, and the differential gain Gd is performed, and the pump 2 performs a PID operation. The command rotation speed is set. Further, when there are a plurality of pumps as in the present embodiment, the control unit 40 also controls the number of pumps according to the amount of water by the number of pumps that can be started at the same time (the number of pumps operating in parallel).

When the amount of water used in the building is reduced during the operation of the pump 2, the flow switch 24 detects an insufficient amount of water and sends a detection signal to the control unit 40 (small amount of water state). Upon receiving this detection signal, the control unit 40 issues a command to the pump 2, increases the rotation speed of the pump 2 until the discharge pressure reaches a predetermined stop pressure Pf, accumulates the pressure in the pressure tank 28, and then stops the pump 2 ( Stop the small amount of water). When water is used again in the building after the small amount of water is stopped by the pump 2, the discharge pressure drops to the starting pressure Ps or less and the pump 2 starts. When there are a plurality of pumps as in the present embodiment, it is preferable to rotate the starting pump 2 to prevent water from staying in the pump 2. Further, as a method for detecting a small amount of water, other means such as a low load due to the current value of the motor 3 and a deadline pressure may be used without using the flow switch 24.

Next, a more specific rotation speed control of the pump 2 in the automatic water supply of the water supply device 100 of the present embodiment will be described. FIG. 3 is a flowchart showing an example of the control mode setting process executed by the control unit 40 of the first embodiment. In this control mode setting process, the control mode of the water supply device 100 is one of a first control mode in a normal state and a second control mode in which low power control is performed to reduce power consumption as compared with the first control mode. It is a process to set to. The control mode setting process is repeatedly executed by the control unit 40 during the automatic water supply control of the water supply device 100. In general, the water supply device is equipped with a plurality of models depending on the combination of the diameter and output of the pump 2 as a product group, and the water supply destination is based on the planned water consumption amount and the total head from the plurality of models. A water supply device 100, which is a model suitable for a building, is selected. Here, the planned water consumption of the water supply destination building is obtained by a calculation from the safety side to some extent, with an appropriate water consumption amount (instantaneous maximum water consumption amount) according to the water supply target building. In addition, the total head is also calculated from the safety side to some extent. Therefore, in the first control mode in the normal state, the estimated terminal pressure constant control using the standard control lift curve B based on the pressure PA1 and PB1 described later is used, and the pressure PA1 and PB1 are at the end of the building. In many cases, the value stands on the safety side so that the required pressure is not insufficient in the water tap 10a. Therefore, the water supply device 100 can have a second control mode, which is a low power control in which the power consumed by the pump 2 is reduced.

Here, an example of the second control mode will be described with reference to FIG. 2B. FIG. 2B shows a plurality of control lift curves set via the setting unit 46 and stored in the storage unit 47. In this example, for example, the required head obtained from the sum of the building head (height of the top floor) H1, the pressure required for the water tap 10 (pressure loss of the water tap) H2, and the pipe loss H3 depending on the flow rate (H1 + H2 + H3). For example, in addition to the standard control lift curve B having a margin of about 10% with respect to the curve A, a total of four control lift curves C1, C2, and C3 for all flow rate range energy-saving control lift curves. Is used.

The heads C1, C2, and C3 for energy-saving control in the entire flow rate range are set to have a lower head over the entire flow rate range substantially in parallel with the lift curve B for standard control, and have a higher head than the required lift curve A. It is set high. Then, the head is set to be lowered in the order of the head curves C1, C2, and C3 for energy-saving control in the entire flow rate range. Then, one of the four control lift curves B, C1, C2, and C3 is selected, and the rotation speed of the pump 2 is controlled based on the selected control lift curves B, C1, C2, or C3. To.

As shown in FIG. 2A, the ECO button 519 of the operation panel 51 sequentially switches the four control lift curves B, C1, C2, and C3 stored in the storage unit 47. The control lift curve used for controlling the rotation speed of the pump 2 is displayed by the ECO lamp 512b (HML) corresponding to the control lift curve and is stored in the storage unit 47. ..

As a result, if the ECO button 519 is not pressed, the control unit 40 executes the first control mode. In the first control mode, the standard control lift curve B is used to control the rotational speed of the pump 2 without turning on the ECO lamp 512b. Then, when the operator presses the ECO button 519, the control unit 40 executes the second control mode. In the second control mode, when the ECO button 519 is pressed once, the lamp corresponding to "L" of the ECO lamp 512 lights up, and the head curve C1 for energy-saving control in the entire flow rate range controls the rotation speed of the pump 2. Used, when the ECO button 519 is pressed twice, the lamp corresponding to "M" of the ECO lamp 512b lights up, and the head curve C2 for full flow rate energy saving type control is used to control the rotation speed of the pump 2. When the ECO button 519 is pressed three times, the lamp corresponding to “H” of the ECO lamp 512b lights up, and the head curve C3 for energy-saving control in the entire flow rate range is used to control the rotation speed of the pump 2. Pressing the ECO button 519 four times returns to the first control mode.

As a result, the user can easily switch between the control lift curve B used in the first control mode and the control lift curve C1, C2 or C3 used in the second control mode by pressing the ECO button 519. This switched control mode can be confirmed by the ECO lamp 512b. Each time the ECO button 519 is pressed, the control lift curve used for control is switched in the order of B to C1, C1 to C2, C2 to C3, and C3 to B. The number of control lift curves (H, M, L) used in is not dependent on this.

Next, a case where the rotation speed of the pump is controlled by this water supply device so that the flow rate used by the user becomes Q1 will be described with reference to FIG. 2B. First, when the ECO button 519 is not pressed, the rotation speed of the pump 2 is controlled based on the standard control lift curve B, and the intersection U3 between the standard control lift curve B and the flow rate Q1 is the operating point of the pump 2. Become. At this time, the lamp of the ECO lamp 512b is not turned on.

When the user presses the ECO button 519 once, the rotation speed of the pump 2 is controlled based on the total flow rate energy-saving control lift curve C1, and the total flow rate energy-saving control lift curve C1 and the flow rate Q1 are controlled. The intersection U4 is the operating point of the pump 2. At this time, the lamp corresponding to "L" of the energy saving display unit 23 lights up. When the ECO button 519 is pressed twice, the rotation speed of the pump 2 is controlled based on the total flow rate energy-saving control lift curve C2, and the intersection U5 between the total flow rate energy-saving control lift curve C2 and the flow rate Q1 is set. This is the operating point of the pump 2. At this time, the lamp corresponding to "M" of the ECO lamp 512b lights up. Then, when the ECO button 519 is pressed three times, the rotation speed of the pump 2 is controlled based on the total flow rate energy-saving control lift curve C3, and the intersection of the total flow rate energy-saving control lift curve C3 and the flow rate Q1. U6 is the operating point of the pump 2. At this time, the lamp corresponding to “H” of the ECO lamp 512b lights up. As described above, if the control lift curve is any of C1, C2, and C3 in the second control mode, the pump 2 consumes the control lift curve as compared with the case of the first control mode of B. It is a low power control that saves labor.

In the low power control in the second control mode in the following description, a case where any one of C1, C2, and C3 is used as the control lift curve used for the rotation speed control of the pump will be described, but in the second control mode. For low power control, the control lift curves B, C1, C2, and C3 may use the same curve, and the set pressure Pt may be changed by pressing the ECO button 519. In addition to or in addition to the operation of the ECO button 519, for example, the control unit 40 has a head curve C1, C2, C3 for full flow rate energy-saving control during a time zone such as midnight or daytime when the amount of water supply is small. The standard control lift curve B shall be used during the time period when the amount of water supply is relatively large, such as in the morning or evening, and the control lift curve is selected by the timekeeping of the calculation unit 48. The ECO lamp 512b corresponding to the selected control lift curve may be displayed. Further, the control unit 40 stores the operation date and time, rotation speed, etc. of the pump 2 in the storage unit 47 as a history of the water supply amount, and based on the history of the water supply amount, the entire flow rate range energy saving type in the time zone when the water supply amount is small. Any one of the control lift curves C1, C2, and C3 may be used, and the standard control lift curve B may be used in a time zone in which the amount of water supply is large.

In the control mode setting process of FIG. 3, the control unit 40 first determines whether or not the second control mode is requested (S100). In the first embodiment, the control unit 40 determines that the second control mode is requested when the low power control is selected by operating the ECO button 519 of the operation panel 51 or the like. Specifically, the control unit 40 refers to a predetermined storage area of the storage unit 47 in which storage is performed in response to an operation of the ECO button 519, and any of H, M, and L of the ECO lamp 512b is lit. If so, it is determined that the second control mode is requested, and if the ECO lamp 512b is off, it is determined that the second control mode is not requested.

When the second control mode is requested (S100: Yes), the control unit 40 sets the second control mode for performing low power control as the control mode (S110), and stores the previous control mode in the storage unit 47 (S130). ), And ends the control mode setting process. At this time, it is preferable that the control unit 40 stores the previous control mode in the non-volatile storage area (nonvolatile memory) of the storage unit 47.

When the second control mode is not requested (S100: No), the control unit 40 determines whether or not the previous control mode stored in the storage unit 47 is the second control mode (S112). When the second control mode is not requested and the previous control mode is not the second control mode, that is, when the previous control mode is the first control mode (S112: No), the control unit 40 is in control mode. The first control mode is set as the control mode (S120), the previous control mode is stored as the first control mode (S130) in the storage unit 47, and the control mode setting process is terminated without changing. By storing the previous control mode in the non-volatile memory of the storage unit 47, the water supply device can set the state of the control mode before the start-up to the previous control mode.

On the other hand, when the second control mode is not requested and the previous control mode stored in the storage unit 47 is the second control mode (S112: Yes), the control unit 40 starts from the second control mode. 1 The switching control process for switching to the control mode is executed (S114). Then, after the switching control process, the control unit 40 sets the first control mode as the control mode (S120), stores the previous control mode in the storage unit 47 (S130), and ends the control mode setting process. That is, in the present embodiment, when switching from the second control mode to the first control mode, the control unit 40 executes the control by the first control mode after executing the switching control process. The details of this switching control process will be described later.

FIG. 4 is a flowchart showing an example of the numerical value setting process for control. This control numerical value setting process is a process of setting a control numerical value used for controlling the water supply device 100 when the first control mode or the second control mode is set in the control mode. In the present embodiment, in the control numerical value setting process, the control mode is changed from the first control mode to the second control mode and from the second control mode to the first control mode by the control unit 40 in the flow of FIG. It should be executed when. Specifically, in step S110 of the flow of FIG. 3, the previous control mode stored in the storage unit 47 is the first control mode, and the previous control mode stored in the storage unit 47 in step S120. May be executed when is in the second control mode.

When the control numerical value setting process is executed, the control unit 40 determines the current control mode (S).
200). Specifically, the control unit 40 refers to a predetermined storage area of the storage unit 47. Then, when the control mode is the first control mode (S200: first control mode), the control unit 40 sets the standard control lift curve B in the control lift curve HC (S201), and sets the predetermined first setting. The pressure Pt1 is set to the set pressure Pt (S202), and the first current limit value As1 is set to the predetermined current limit value As (S204). Further, the control unit 40 sets the value N1 in the number of operable pumps Pn (S206), and ends the control numerical value setting process. Here, the first set pressure Pt1 can be, for example, the discharge pressure PA at the maximum flow rate in the control lift curve B (PA1 at the maximum flow rate Q0 in FIG. 2B). The current limit value As is, for example, a limit value of the current flowing through the inverter 20, and the first current limit value As1 can be a stall current value based on the rated current of the motor 3. In this case, the inverter 20 controls the motor 3 so that the current flowing through the inverter 20 does not exceed the current limit value As. Further, the current limit value As may be a limit value for the total current value flowing through the plurality of inverters 20. In this case, the control unit 40 may send a command to the inverters 20 so that the total current value flowing through the plurality of inverters 20 does not exceed the current limit value As. The number of operable pumps Pn is the number of pumps that are allowed to be operated at the same time, and the value N1 may be, for example, the number of pumps 2 included in the water supply device 100 (“2” in this embodiment). The first set pressure Pt1, the first current limit value As1, and the value N1 may be set on the operation panel 51.

When the control numerical value setting process is executed and the control mode is the second control mode (S200: second control mode), the control unit 40 displays the control lift curve HC on the control lift curve HC for energy-saving control in the entire flow rate range. Any of the curves C1, C2, C3 (C1, C2, C3 ≦ B) is set (S211), the second set pressure Pt2 is set to the set pressure Pt (S212), and the second current is set to the current limit value As. The limit value As2 is set (S214). Further, the control unit 40 sets a value N2 for the number of operable pumps Pn (S216), and ends the control numerical value setting process. Here, the second set pressure Pt2 is a pressure (Pt2 ≦ Pt1) equal to or less than the first set pressure Pt1, and the second current limit value As2 is a value (As2 ≦ As1) equal to or less than the first current limit value As1. , The values determined by the experiment or simulation in which the pump 2 is operated on the head curves C1, C2, and C3 for energy-saving control in the entire flow rate range can be used. Further, the value N2 set in the number of operable pumps Pn is a value (N2 ≦ N1) equal to or less than the value N1, and can be, for example, a value 1. The second set pressure Pt2, the second current limit value As2, and the value N2 may each be set on the operation panel 51. Here, at least one of the control lift curve, the set pressure Pt, the current limit value As, and the number of operable pumps Pn set in the second control mode is smaller than the value set in the first control mode. As a result, the second control mode becomes a low power control that consumes less power in the pump 2 than the first control.

In the second control mode, when the set pressure Pt is set to the second set pressure Pt2 smaller than the first set pressure Pt1 in the first control mode, the target pressure (SV) of the pump 2 set by the control unit 40 is set. It gets smaller. When the second current limit value As2, which is smaller than the first current limit value As1 in the first control mode, is set in the current limit value As2 in the second control mode, the control unit 40 or the inverter 20 may use the inverter 20. The motor 3 is controlled so that the current flowing through the inverter does not exceed the second current limit value As2. By such control, in the second control mode, the current flowing through the inverter 20 is limited, particularly when the rotation speed of the pump 2 is increased or when the pump 2 is driven at a large rotation speed. Further, in the second control mode, when the number of pumps 2 to be operated is limited, the number of pumps 2 to be operated is limited and the power consumption of the water supply device 100 can be reduced. The numerical value setting process for control in FIG. 4 is an example, and is limited to those in which the set pressure Pt, the current limit value As, and the number of operable pumps Pn are changed between the first control mode and the second control mode. It's not a thing. For example, in place of at least a part of these control numerical values, or in addition, other control numerical values may be changed between the first control mode and the second control mode. Other examples of control numerical values to be changed in the control numerical value setting process include proportional gain Gp, acceleration time of the inverter 20, and the like.

Next, the switching control process executed when switching from the second control mode to the first control mode will be described. In the switching control process, the pump 2 is controlled by a switching control process different from the control of the pump 2 in the first control mode. In the present embodiment, in the switching control, the pump 2 is controlled in the switching control mode, and the switching control mode includes a high output control mode, a low output control mode, a sudden change control mode, and a slow change control mode. Have. The control unit 30 of the present embodiment selects one of the high output control mode, the low output control mode, the sudden change control mode, and the slow change control mode as the switching control process. However, the switching control process may be a combination of the high output control mode and the sudden change control mode, or a combination of the low output control mode and the slow change control mode. Further, in the switching control process, the elapsed time may be changed from the slow change control mode to the sudden change control mode after a predetermined time has elapsed, or the transition from the low output control mode to the high output control mode after a predetermined time has elapsed. Depending on the amount of water supplied, a timely switching control mode may be combined. As described above, the control unit 30 has a plurality of switching control modes, and at least one of the plurality of switching control modes is selected by an external input, a determination of a water supply status, or the like. By selecting at least one of the plurality of switching control modes, the control unit 30 appropriately supplies water by the switching control process according to the user's request or the installation situation in which the water supply device 100 is placed. be able to.
Hereinafter, the water supply device 100 is controlled by the high output control mode or the low output control mode, which is the output control of the pump 2, and the water supply device 100 is controlled by the sudden change control mode or the slow change control mode, which controls the amount of change in the output of the pump 2. The control will be described.

FIG. 5A is a flowchart showing an example of the high output control mode control process executed by the control unit 30. In the high output control mode, when the control unit 40 switches from the second control mode to the first control mode, the control unit 40 controls the pump 2 by a switching control process in which the outputs of the first control mode and the pump 2 are different from each other. This process is an example of the switching control process (S114) of FIG. 3, and is executed when the control mode is switched from the first control mode to the second control mode.

When the control process in the high output control mode is executed, first, the control unit 40 sets the numerical value for the high output control mode to the numerical value for control used for controlling the water supply device 100 (S311 to 318). Specifically, the control unit 40 sets the high output standard control lift curve B1a in the control lift curve HC (S311), sets the third set pressure Pt3a in the set pressure Pt (S312), and sets the starting pressure. The third starting pressure Ps3a is set in Ps (S314). Further, the control unit 40 sets the value N3a in the starting pump number Pns (S316) and sets the third rotation speed Ns3a in the pump starting rotation speed Ns (S318). Here, in the high output standard control lift curve B1a, as shown in FIG. 5C, the pressure value at each flow rate is equal to or higher than the pressure value of the standard control lift curve B (B1a ≧ B). The high output standard control lift curve B1a is preferably parallel to the standard control lift curve B. The third set pressure Pt3a is a pressure (Pt3a ≧ Pt1) equal to or higher than the first set pressure Pt1 in the first control mode, and can be, for example, a pressure obtained by applying a predetermined pressure to the discharge pressure PA at the maximum flow rate. .. Further, in S312, a pressure PB3a in which a predetermined pressure is applied to the discharge pressure PB1 during operation may be set. The third starting pressure Ps3a is a pressure (Ps3a ≧ Ps0) equal to or higher than the starting pressure Ps0 in the first control mode and the second control mode, and a value determined by an experiment or simulation can be used. The number of starting pumps Pns is the number of pumps 2 to be started at the same time (N3a ≧ N1), and a predetermined value such as a value 2 can be used as the value N3a. The pump starting rotation speed Ns is used as a target rotation speed when starting the pump 2, and the third rotation speed Ns3a is a rotation speed (Ns3a ≧) of the starting rotation speed Ns0 or more in the first control mode and the second control mode. Ns0) can be used. The high output standard control lift curve B1a, the third set pressure Pt3a, the third starting pressure Ps3a, the value N3a, and the third rotation speed Ns3a may each be set on the operation panel 51.

When the control numerical value for the high output control mode is set, the control unit 40 controls the operation of the pump 2 using the set control numerical value (S320). Specifically, when the discharge pressure is equal to or lower than the starting pressure Ps, the control unit 40 starts the pump 2. Then, during the operation of the pump 2, control such as estimated terminal pressure constant control or target pressure constant control is performed by the set pressure (set pressure) Pt. After that, when the use of water in the building is reduced during the operation of the pump 2, the pump 2 is stopped by a small amount of water. Further, in S320, the control unit 40 may store various operation histories such as the rotation speed, the discharge pressure, the current value, the start / stop time, and the number of starts / stops related to the operation of the pump 2 in the storage unit 47. In the high output control mode, the control lift curve is set to the high output standard control lift curve B1a, and the set pressure Pt is set to a third set pressure Pt3a larger than the first set pressure Pt1 in the first control mode. Then, the target pressure (SV) of the pump 2 set by the control unit 40 becomes large. Further, when the third starting pressure Ps3a, which is larger than the starting pressure Ps0 in the first control mode, is set in the starting pressure Ps in the high output control mode, the pump 2 is started earlier than in the first control mode. When the pump start rotation speed Ns is set to the third rotation speed Ns3a, which is larger than the start rotation speed Ns0 in the first control mode, the pump 2 is started by designating a rotation speed higher than that in the first control mode. .. When the number of starting pumps Pns is set to a value N3a larger than that in the first control mode, the amount of water supply increases as compared with the first control mode. Due to these actions, the timing at which the pumps 2 are started is earlier than that in the first control mode, and a plurality of pumps 2 based on the number of starting pumps Pns are started at the same time, and the amount of water supply is further increased. In addition, the pump 2 can be started quickly and water can be supplied at a high pressure. Therefore, in the high output control mode, by using at least one of the above-mentioned control numerical values, the output of the pump 2 can be increased as compared with the first control mode, and the pump 2 can be started quickly. It is possible to suppress a decrease in the water supply pressure when returning from the low power control (second control mode). In other words, it is possible to cope with the amount of water supply that increases when water cutoff due to low power control or power shortage is released. Further, by switching to the first control mode after the drive unit is controlled by the high output control mode, water can be appropriately supplied.

When the pump 2 is operating in S320 or the pump 2 is started, the control unit 40 continues the operation of the pump 2 in the high output control mode until a predetermined time elapses (S322). Here, as the predetermined time, a time predetermined by an experiment or the like can be used, and the predetermined time may be set on the operation panel 51. Then, after a predetermined time has elapsed (S322: Yes) after starting the control of the pump 2 in the high output control mode, and then the small amount of water is stopped (S324: Yes), the control unit 40 of the pump 2 in S320 Various operation histories related to the operation are stored in the non-volatile memory of the storage unit 47 (S326), and the switching control process is terminated. Further, in S320, the control unit 40 does not start the pump 2 because the discharge pressure continues to be higher than the starting pressure Ps, and when a predetermined time elapses (S322: Yes), the pump 2 stops the small amount of water. In the middle (S324: Yes), the control unit 40 stores various operation histories related to the operation of the pump 2 in the non-volatile memory of the storage unit 47 (S326), and ends the switching control process. When the switching control process is completed, the control mode is set to the first control mode (S120) in the control mode setting process of FIG. 3, and then the first control unit 40 passes through the control numerical value setting process of FIG. The control of the water supply device 100 by the control mode is executed.

As described above, when the second control mode is set as the control mode, the power consumption by the water supply device 100 becomes small, but the pump 2 is operated with a small output accordingly, so that the user has sufficient water. May not be available. Therefore, when the second control mode is released and the first control mode is switched to, it is assumed that the user uses a larger amount of water than usual for a short period of time. On the other hand, the water supply device 100 of the present embodiment
Then, when the second control mode is switched to the first control mode, the pump 2 is controlled by the high output control mode for a predetermined time, and then the pump 2 is controlled by the first control mode. As a result, it is possible to prevent the water supply pressure from being insufficient by the water supply device 100 after the release of the second control mode, and to supply water appropriately. Here, the predetermined time in S322 may be set based on the time during which the pump 2 was controlled by the second control mode before the switching control process was executed. That is, the control unit 40 measures the time during which the pump 2 is controlled by the second control mode, and the longer the time, the longer the predetermined time of S322 is set. Specifically, a predetermined time of S322 may be set based on the time when the pump 2 is controlled by the second control mode and a predetermined map or conversion formula. In this way, the longer the time when the second control mode is set in the control mode and the pump 2 is operated with a small output, the longer the time for executing the switching control process when the second control mode is released becomes longer. It is possible to supply water more appropriately.

The control process in the high output control mode in FIG. 5A is an example, and the high output control mode is limited to those in which the set pressure Pt, the starting pressure Ps, the number of starting pumps Pns, and the pump starting rotation speed Ns are changed. It's not something. For example, other control values may be modified in place of, or in addition to, at least a portion of these control values. Further, in the high output control mode, when the pump 2 is in a small water volume state, the pump 2 may be forcibly operated without stopping for a predetermined period. Further, even if the pump 2 is in a small water volume state until a predetermined time elapses after the pump 2 is controlled in the high output control mode (S322), the pump 2 may be forcibly operated without stopping. good. By doing so, it is possible to prevent the water supply pressure from becoming insufficient due to the sudden use of a large amount of water. However, when the temperature of the pump 2 reaches a predetermined threshold value or higher, it is preferable to stop the pump 2.

FIG. 5B is a flowchart showing an example of the control process in the low output control mode executed by the control unit 30. In the low output control mode, when the control unit 40 switches from the second control mode to the first control mode, the control unit 40 controls the pump 2 by a switching control process in which the outputs of the first control mode and the pump 2 are different from each other. This process is an example of the switching control process (S114) of FIG. 3, and is executed when the control mode is switched from the second control mode to the first control mode. In FIG. 5B, the same reference numerals are given to the same processes as those in the high output control mode control process of FIG. 5A.

When the control process in the low output control mode is executed, the control unit 40 sets the numerical value for the low output control mode to the numerical value for control used for controlling the water supply device 100 (S331 to 338). Specifically, the control unit 40 sets the low output control lift curve B1b in the control lift curve HC (S331), sets the third set pressure Pt3b in the set pressure Pt (S332), and sets the starting pressure Ps. The third starting pressure Ps3b is set to (S314). Further, the control unit 40 sets the value N3b in the starting pump number Pns (S316) and sets the third rotation speed Ns3b in the pump starting rotation speed Ns (S318). Here, in the low output standard control lift curve B1b, as shown in FIG. 5C, the pressure value at each flow rate is equal to or less than the pressure value of the standard control lift curve B (B1b ≦ B). Further, it is preferable that the low output standard control lift curve B1b is parallel to the standard control lift curve B. The third set pressure Pt3b is a pressure (Pt3b ≦ Pt1) equal to or lower than the first set pressure Pt1 in the first control mode, and can be, for example, a pressure obtained by subtracting a predetermined pressure from the discharge pressure PA at the maximum flow rate. .. Further, the set pressure in S332 may be set to the pressure PB3b obtained by subtracting a predetermined pressure from the discharge pressure PB1 at the time of the deadline operation. The third starting pressure Ps3b is a pressure (Ps3b ≦ Ps0) equal to or lower than the starting pressure Ps0 in the first control mode and the second control mode, and a value determined by an experiment or simulation can be used. As the value N3b, a predetermined value (N3b ≦ N1) such as the value 1 can be used. As the third rotation speed Ns3b, a rotation speed (Ns3 ≦ Ns0) of which the starting rotation speed Ns0 or less in the first control mode and the second control mode can be used can be used. The standard control lift curve B1b for low output,
Each of the third set pressure Pt3b, the third starting pressure Ps3b, the value N3b, and the third rotation speed Ns3b may be set in the operation panel 51.

When the control numerical value for the low output control mode is set, the control unit 40 controls the operation of the pump 2 using the set control numerical value (S320). When the set pressure Pt is set to the third set pressure Pt3b smaller than the first set pressure Pt1 in the first control mode in the low output control mode, the target pressure (SV) of the pump 2 set by the control unit 40 is set. It gets smaller. Further, in the low output control mode, when the third starting pressure Ps3b, which is smaller than the normal starting pressure Ps0, is set in the starting pressure Ps, the pump 2 is started later than the normal time. When the third rotation speed Ns3b, which is smaller than the normal start rotation speed Ns0, is set in the pump start rotation speed Ns, the pump 2 is started by designating a rotation speed lower than that in the normal time. When the value N3b smaller than the normal time is set for the number of starting pumps Pns, the amount of water supply is reduced as compared with the normal time. Due to these actions, the output of the pump 2 can be suppressed and started as compared with the first control mode. As a result, when the control mode is switched from the second control mode to the first control mode, water is supplied at a pressure lower than that of the first control mode, the amount of water supply and the amount of electric power are suppressed, and water is appropriately supplied. can. That is, when the water cutoff due to low power control or power shortage is released, the amount of water supply and the amount of power can be suppressed, and the output of the pump can be suppressed from becoming unintendedly large to supply water appropriately. ..

Then, the control unit 40 continues the operation of the pump 2 in the low output control mode until the predetermined time elapses (S322) and the pump stops the small amount of water (S324), as in the control process in the high output control mode. do. Then, when a predetermined time has elapsed since the control of the pump 2 in the low output control mode was started (S322: Yes) and the small amount of water stopped the pump 2 (S324: Yes), the control unit 40 changed the pump 2 in S320. Various operation histories related to the operation of the above are stored in the non-volatile memory of the storage unit 47 (S326), and the switching control process is terminated. Further, the control unit 40 does not start the pump 2 because the discharge pressure continues to be higher than the starting pressure Ps in S340, and when a predetermined time elapses (S322: Yes), the pump 2 is stopped for a small amount of water. As (S324: Yes), the control unit 40 stores various operation histories related to the operation of the pump 2 in S320 in the non-volatile memory of the storage unit 47 (S326), and ends the switching control process. When the switching control process is completed, the control mode is set to the first control mode (S120) in the control mode setting process of FIG. 3, and then the first control unit 40 passes through the control numerical value setting process of FIG. The control of the water supply device 100 by the control mode is executed.

As described above, when the second control mode is set as the control mode, the pump 2 is operated with a small output, so that the user cannot use enough water and the faucet is opened wide. It is assumed that there is. When the second control mode is released and the control mode is switched from the second control mode to the first control mode while the faucet is wide open, an unintended flow rate of water suddenly comes out from the faucet. There is a risk. That is, the water supply device 100 may show an excessive reaction. On the other hand, in the water supply device 100 of the present embodiment, after the second control mode is released, the pump 2 is controlled by the low output control mode, and then the pump 2 is controlled by the first control mode. As a result, after the second control mode is released, it is possible to suppress the output of the pump 2 from becoming excessive and supply water appropriately. Furthermore, the water main pressure drops and the power supply power due to a sudden change in the discharge pressure. Can be prevented from running out. In other words, it is possible to cope with the amount of water supply that temporarily increases when the water outage due to low power consumption or power shortage is lifted.

The control process in the low output control mode in FIG. 5B is an example, and the low output control mode is limited to those in which the set pressure Pt, the starting pressure Ps, the number of starting pumps Pns, and the pump starting rotation speed Ns are changed. It's not something. For example, other control values may be modified in place of, or in addition to, at least a portion of these control values. Further, in the low output control mode, as in the high output control mode, when the pump 2 is in a small water volume state, the pump 2 may be forcibly operated without stopping for a predetermined period. Further, even if the pump 2 is in a small water volume state until a predetermined time elapses after the pump 2 is controlled in the low output control mode (S322), the pump 2 may be forcibly operated without stopping. good. By doing so, it is possible to prevent the discharge pressure from suddenly changing even if the flow rate suddenly changes during the low output control mode. However, when the temperature of the pump 2 reaches a predetermined threshold value or higher, it is preferable to stop the pump 2.

FIG. 6A is a flowchart showing an example of the control process in the sudden change control mode executed by the control unit 30. In the sudden change control mode, when the control unit 40 switches from the second control mode to the first control mode, the control unit 40 controls the pump 2 by a switching control process in which the change in the output of the pump 2 is different from that of the first control mode. This process is another example of the switching control process (S114) of FIG. 3, and is executed when the control mode is switched from the second control mode to the first control mode. In FIG. 6A, the same reference numerals are given to the same processes as those in the high output control mode control process of FIG. 5A.

When the sudden change control mode control process is executed, first, the control unit 40 sets the numerical value for the sudden change control mode to the control numerical value used for controlling the water supply device 100 (S411 to 416). Specifically, the control unit 40 sets the control lift curve HC to the sudden change standard control lift curve B4a (S411), sets the set pressure Pt to the fourth set pressure Pt4a (S412), and is capable of operation. The value N4a is set in the number of pumps Pn (S414). Further, the control unit 40 sets the value Gp4a to the proportional gain Gp (S416). Here, in the sudden change standard control lift curve B4a, as shown in FIG. 6C, the slope of the tangent line at a predetermined flow rate is larger than the slope of the standard control lift curve B. The fourth set pressure Pt4a is a pressure (Pt4a ≧ Pt1) equal to or higher than the first set pressure Pt1 in the first control mode, and for example, the same pressure as the third set pressure Pt3a can be used. Further, in S412, the discharge pressure PB4a at the time of the deadline operation may be set. It is preferable to set the value of PB1 for PB4a, but if the slope of the lift curve connecting PB4a and Pt4a is larger than the slope of the standard control lift curve B, PB4a may be smaller or larger than PB1. .. The value N4a set in the number of operable pumps Pn is a value (N4a ≧ N1) equal to or higher than the value N1 in the first control mode, and for example, the same value as the value N3a can be used. The value Gp4a set in the proportional gain Gp is a value (Gp4a ≧ Gp0) equal to or higher than the proportional gain Gp0 in the first control mode, and is used in the sudden change standard control lift curve B4a and the fourth set pressure Pt4a. A value determined by an experiment or a simulation in which the pump 2 is operated can be used. Further, in S416, the control unit 40 may, in addition to or instead of setting the value Gp4a for the proportional gain Gp, set the acceleration time of the inverter 20 shorter than that in the first control mode. The lift curve B4a, the fourth set pressure Pt4a, the value N4a, and the value Gp4a may each be set on the operation panel 51.

When the control numerical value for the sudden change control mode is set, the control unit 40 controls the rotation speed of the pump 2 using the set control numerical value (S320). In the sudden change control mode, the set pressure Pt is set to the fourth set pressure Pt4a having a larger rate of change than the first set pressure Pt1 in the first control mode, and the change in the target pressure (SV) of the pump 2 becomes large. .. Further, since the rotation speed of the pump 2 and the discharge flow rate are generally proportional to each other, in the sudden change control mode, the proportional gain Gp is set to a value Gp4a equal to or higher than the proportional gain Gp0 of the first control mode. Discharge flow rate changes rapidly. Therefore, the shortage of the flow rate immediately after switching from the second control to the first control is quickly resolved, and water can be appropriately supplied. In other words, it is possible to cope with the sudden increase in water supply amount when the water cutoff due to low power control or power shortage is released. Further, by switching to the first control mode after the drive unit is controlled by the sudden change control mode, water can be supplied quickly.

The control unit 40 continues to control the pump 2 in the sudden change control mode until the predetermined time elapses (S322) and the pump 2 stops the small amount of water (S324). Then, when a predetermined time has elapsed (S322: Yes) after starting the control of the pump 2 in the sudden change control mode and the small amount of water is stopped (S324: Yes), the control unit 40 operates the pump 2. Various operation histories related to the above are stored in the storage unit 47 (S326), and the switching control process is terminated.

With such a sudden change control mode, it is possible to suppress the shortage of the amount of water supplied by the water supply device 100 immediately after switching from the second control to the first control, and to supply water appropriately. The sudden change control mode control process in FIG. 6A is an example, and the sudden change control mode is not limited to the one in which the set pressure Pt, the number of operable pumps Pn, and the proportional gain Gp are changed. For example, other control numerical values may be changed in place of or in addition to at least a part of the above-mentioned control numerical values such as the acceleration time and deceleration time of the inverter 20. Further, in the sudden change control mode, as in the high output control mode, when the pump 2 is in a small water volume state, the pump 2 may be forcibly operated without stopping for a predetermined period. Further, until a predetermined time elapses after controlling the pump 2 in the sudden change control mode (S322), even if the pump 2 is in a small water volume state, the pump 2 is forcibly operated without stopping. May be good. By doing so, it is possible to prevent the amount of water supplied by the water supply device 100 from being temporarily insufficient. However, when the temperature of the pump 2 reaches a predetermined threshold value or higher, it is preferable to stop the pump 2.

FIG. 6B is a flowchart showing an example of the slow change control mode control process executed by the control unit 40. In the slow change control mode, when the control unit 40 switches from the second control mode to the first control mode, the control unit 40 controls the pump 2 by a switching control process in which the change in the output of the pump 2 is different from that of the first control mode. This process is another example of the switching control process (S114) of FIG. 3, and is executed when the control mode is switched from the second control mode to the first control mode. In FIG. 6B, the same reference numerals are given to the same processes as those in the high output control mode control process of FIG. 5A, and the description thereof will be omitted.

When the slow change control mode control process is executed in the switching control process, the control unit 40 first sets the slow change control mode numerical value as the control numerical value used for controlling the water supply device 100. (S431 to 436). Specifically, the control unit 40 sets the warm change standard control lift curve B4b in the control lift curve HC (S431), sets the fourth set pressure Pt4b in the set pressure Pt (S432), and can operate. The value N4b is set for the number of pumps Pn (S434). Further, the control unit 40 sets the value Gp4b to the proportional gain Gp (S436). Here, in the warm change standard control lift curve B4b, as shown in FIG. 6C, the slope of the tangent line at a predetermined flow rate is smaller than the slope of the standard control lift curve B. The fourth set pressure Pt4b is a pressure (Pt4b ≦ Pt1) equal to or lower than the first set pressure Pt1 in the first control mode, and for example, the same pressure as the third set pressure Pt3b can be used. Further, in S432, the discharge pressure PB4b at the time of the deadline operation may be set. If the slope of the lift curve connecting PB4b and Pt4b is smaller than the slope of the standard control lift curve B, PB4b may be PB1 or more or less. The value N4b set in the number of operable pumps Pn is a value (N4 ≦ N1) equal to or less than the value N1 in the first control mode, and for example, the same value as the value N2 in the second control mode can be used. .. The value Gp4b set in the proportional gain Gp is a value (Gp4 ≦ Gp0) equal to or less than the proportional gain Gp0 in the first control mode, and the pump 2 is used in the warm change standard control lift curve B4b or the fourth set pressure Pt4b. It is also possible to use a value determined by an experiment or a simulation in which the head is operated. Further, in S436, the control unit 40 may, in addition to or instead of setting the value Gp4a for the proportional gain Gp, set the acceleration time of the inverter 20 longer than in the first control mode. The fourth set pressure Pt4b, the value N4b, and the value Gp4b may each be set on the operation panel 51.

When the control numerical value for the slow change control mode is set, the control unit 40 controls the rotation speed of the pump 2 using the set control numerical value (S320). In the slow change control mode, when the set pressure Pt is set to the fourth set pressure Pt4b whose target pressure change is smaller with respect to the change in the flow rate than the first set pressure Pt1 in the first control mode, the control unit 40 is set. The change in the target pressure (SV) of the pump 2 to be set becomes small. Further, in the slow change control mode, when the proportional gain Gp is set to a value Gp4 smaller than the proportional gain Gp0 in the first control mode, the rotation speed of the pump 2 changes slowly. Thereby, in the slow change control mode, the output of the pump 2 can be changed more slowly than in the first control mode.

The control unit 40 continues to control the pump 2 in the slow change control mode until the predetermined time elapses (S322) and the pump 2 stops the small amount of water (S324). Then, when a predetermined time has elapsed (S322: Yes) after starting the control of the pump 2 in the slow change control mode and the small amount of water is stopped (S324: Yes), the control unit 40 operates the pump 2. Various operation histories related to the above are stored in the storage unit 47 (S326), and the switching control process is terminated.

As described above, when the second control mode is set as the control mode, the pump 2 is operated in a state where the power consumption is smaller than that of the first control mode, so that the water supply amount is limited by the control unit 40 and used. It is also assumed that a person cannot use a sufficient amount of water and the faucet is wide open (for example, fully open). If the second control mode is released and switched to the first control mode while the water tap is wide open, there is a risk that an unintended flow rate of water may suddenly come out from the tap. That is, there is a possibility that the water supply device 100 from which the restriction on the amount of water supply is released shows an excessive reaction, and the control unit 40 rapidly accelerates the rotation speed of the pump 2. On the other hand, in the water supply device 100 of the present embodiment, when the second control mode is released and switched to the first control mode, the pump 2 is operated by the slow change control mode in which the discharge flow rate of the pump 2 gradually changes. After the control, the pump 2 is controlled by the first control mode. As a result, when the control mode is switched from the second control mode to the first control mode, it is possible to suppress a temporary sudden change in the discharge flow rate of the pump 2 and appropriately supply water. That is, when the water cutoff due to the low power control or the power shortage is released, the water supply amount and the power amount can be suppressed, and the unintended change in the output of the pump can be suppressed and the water supply can be appropriately performed.

The slow change control mode control process in FIG. 6B is an example, and the slow change control mode is not limited to the one in which the set pressure Pt, the number of operable pumps Pn, and the proportional gain Gp are changed. For example, other control values may be modified in place of, or in addition to, at least a portion of these control values. Further, in the slow change control mode, as in the high output control mode, when the pump 2 is in a small water volume state, the pump 2 may be forcibly operated without stopping for a predetermined period. Further, even if the pump 2 is in a small water volume state until a predetermined time elapses after the pump 2 is controlled in the slow change control mode (S322), the pump 2 may be forcibly operated without stopping. good. However, when the temperature of the pump 2 reaches a predetermined threshold value or higher, it is preferable to stop the pump 2. By doing so, it is possible to prevent the discharge flow rate of the pump 2 from suddenly changing.

In the examples shown in FIGS. 5A, 5B, 6A, and 6B, if the condition that a predetermined time elapses (first condition) and the condition that the pump 2 stops the small amount of water (second condition) are satisfied. , The control at the time of switching is terminated and the control by the first control mode is started. However, the present invention is not limited to such an example, and for example, the control unit 40 has at least one of the above-mentioned first condition or the second condition as a condition for terminating the switching control process, and the first condition and the second condition. When either of the conditions is satisfied, the switching control may be terminated and the control by the first control mode may be started.

It is preferable that the operation panel 51 can set which mode shown in FIGS. 5A, 5B, 6A, and 6B is to execute the control in the switching control process. Further, it is preferable that the lamp 512c of the operation panel 51 (display unit 49) indicates that the switching control process is being executed. By doing so, the user who operates the ECO button 519 can recognize that the control process at the time of switching the control mode is being executed. The operation panel 51 displays that the control in each mode of the switching control process is being executed, and predicts the duration of the control in the control mode and the time until the control in the control mode is changed. It would be nice to be able to display at least one of the time. Here, as an example, the predicted time can be a time from the start of the switching control process to the elapse of a predetermined time, or can be a time obtained by adding a margin to the time.

Further, in the switching time control process, the control unit 40 may select which of the switching time control modes shown in FIGS. 5A, 5B, 6A, and 6B is to be controlled. FIG. 7 is a flowchart showing an example of the switching control mode determination process executed by the control unit 40. This process is executed, for example, when the switching control process ends, and the switching control mode of the switching control process when the switching control process is executed next time is selected. In the process of FIG. 7, the control unit 40 selects the high output control mode or the slow change control mode as the switching control process, but the present invention is not limited to such an example. For example, the rapid change control mode may be selected in place of or in addition to the high output control mode, or the low output control mode may be selected in place of or in addition to the slow change control mode. That is, the control unit 40 has a plurality of switching control modes (for example, four modes of low output control mode, high output control mode, slow change control mode, and rapid change control mode), and the switching control mode. Which of these switching control modes should be used for switching control, and / or in what combination (combination of switching control modes, timing of execution, etc.) the plurality of switching control modes should be executed. , Etc. should be selectable. Alternatively, it is preferable that the control unit 40 has at least one switching control mode and can select whether or not to execute the switching control mode.

When the switching control process is executed, the control unit 40 first refers to the information regarding the operation of the pump 2 when the switching control process was executed last time (S600). The control unit 40 stores information (S326) regarding the operation of the pump 2 when the switching control process S320 is being executed in a predetermined area of the storage unit 47, and stores the information stored in S326 in the process of S600. The predetermined area of the unit 47 may be referred to. That is, the control unit 40 refers to the operation history information when the switching control process is executed (S320). Here, in the present embodiment, the rotation speed of the pump 2 is referred to as information regarding the operation of the pump 2, but instead of or in addition to the rotation speed, the flow rate, the discharge pressure, and the motor 3 Various information such as the current value may be referred to.

Subsequently, the control unit 40 compares the maximum rotation speed Nmax of the pump 2 in the previously executed switching control process with the threshold value Nref (S602), and compares the maximum change a of the rotation speed with the threshold value aref (S610). ). Here, since the rotation speed of the pump 2 is proportional to the flow rate, the threshold Nref is a value for determining whether or not the pump 2 has operated at a large flow rate, and is based on the maximum frequency of the inverter 20 or an experiment in advance. A defined value can be used. The maximum change a of the rotation speed means the maximum value of the change in the unit time of the rotation speed in the pump operation (step S320) of the previous switching control process. The threshold value are is a value for determining whether or not the rotation speed of the pump 2 has suddenly increased during the previous switching control process, and a value determined in advance by an experiment or the like can be used. Further, the threshold value Nref and the threshold value aref may be set in the operation panel 51.

When the maximum rotation speed Nmax of the pump 2 in the previous switching control process is larger than the threshold value Nref (S602: Yes), the control unit 40 uses a large amount of water when switching from the second control mode to the first control mode. It is predicted that this will be done, and it is determined that the pump 2 needs a large output. Therefore, when the second control mode is switched to the first control mode, the high output control mode is set to the switching control mode so that the control by the high output control mode is performed in the switching control process (S604). , Ends this determination process.

Further, when the maximum change a of the rotation speed of the pump 2 in the previous switching control process is larger than the threshold value aref (S610: Yes), the control unit 40 discharges when the second control mode is switched to the first control mode. It is a building where the flow rate changes suddenly, and it is judged that it is necessary to suppress the sudden change in the output of the pump 2 by predicting that there is a risk that the water main pressure will drop or the supply power will be insufficient due to the sudden change in the discharge flow rate. .. Therefore, when the second control mode is switched to the first control mode, the slow change control mode is set to the switching control mode so that the control is performed by the slow change control mode in the switching control mode (S614). , Ends this determination process.

When the maximum rotation speed Nmax of the pump 2 is equal to or less than the threshold value Nref (S602: No) and the maximum change a of the rotation speed is equal to or less than the threshold value aref in the previous switching control process (S610: No), the control unit 40 receives. When switching from the second control mode to the first control mode, it is determined that the pump 2 is not operated at a large output and has not changed suddenly. Therefore, when the second control mode is switched to the first control mode next time, the first control mode is directly executed without executing the switching control process (S616), and the present determination process is terminated. do.

By such switching control mode determination processing, the control unit 40 directly performs the first control mode without executing the switching control processing by the high output control mode, the switching control processing by the slow change control mode, or the switching control processing. Is selected to be executed. As a result, appropriate water supply by the water supply device 100 can be performed based on the operation history of the pump 2. When the first control mode is directly executed without executing the switching control process, the control unit 40 stores the operation history information in the storage unit 47 at a predetermined time interval immediately after the first control mode is executed. It is preferable to store the information and then determine the switching control mode using the operation history information when the flow of FIG. 7 is executed.

Further, the control unit 40 controls before the power supply stored in the non-volatile storage area (nonvolatile memory) of the storage unit 47 is cut off when the power supply to the water supply device 100 is cut off and restored. The control mode may be selected based on the mode. FIG. 8 is a flowchart showing an example of the power recovery control mode setting process executed by the control unit 40. This process is executed, for example, when the power supply to the water supply device 100 is restored in the water supply device 100 in which the control mode at the time of starting the power supply is either the first control mode or the second control mode. In the power recovery control mode setting process of FIG. 8, the processes of S112A and S130A are different from the control mode setting process of FIG. 1, and other than that, they are the same as the power recovery control mode setting process of FIG.

In the power recovery control mode setting process, the control unit 40 first determines whether or not the second control mode is requested (S100). Then, when the second control mode is requested (S100: Yes), the second control mode is set as the control mode (S110), and the storage unit 47 stores the control mode at the time of power failure (S130A). Ends the power recovery control mode setting process.
That is, when the second control mode is requested, the second control mode is set as the control mode regardless of the control mode before the power supply is cut off.

When the second control mode is not requested (S100: No), it is determined whether or not the control mode before the power supply is cut off was the first control mode (S112A). When the control mode before the power supply is cut off is the first control mode (S112A: Yes), the first control mode is set as the control mode (S120), and the storage unit 47 is in the control mode at the time of a power failure. Is stored (S130A), and this process is terminated.

On the other hand, when the control mode before the power supply is cut off is not the first control mode (S112A: No), that is, the control mode is the second control mode, or the switching control mode is executed. In that case, the above-mentioned switching control process is executed (S114). Then, after the switching control process is completed, the first control mode is set as the control mode (S120), the control mode at the time of power failure is stored in the storage unit 47 (S130A), and this process is terminated.

In this way, by setting the control mode at the time of power recovery based on the control mode before the power supply is cut off, it is possible to make the start of water supply from the water supply device 10 more appropriate at the time of power recovery. ..

(Second Embodiment)
FIG. 9 is a diagram showing a schematic configuration of the water supply device 100 according to the second embodiment. The water supply device 100 of the second embodiment basically has the same configuration as the water supply device 100 of the first embodiment. The water supply device 100 of the second embodiment is connected to the commercial power source 90 via the power storage device 80, and can be directly supplied with electric power from the commercial power source 90 and can be supplied with electric power from the power storage device 82 of the power storage device 80. .. The power storage device 80 includes a DC inverter 84, a power storage device 82, an AC inverter 85, a switch 88, and a control unit 86. The switch 88 may be provided outside the power storage device 80.

The DC inverter 84 is an inverter that converts the commercial power received from the commercial power source 90 into DC power, and supplies the converted DC power to the storage unit 82. The capacitor 82 is an emergency power source used when there is no power supply from the commercial power source 90 to the water supply device 100, and is a storage battery that stores the DC power supplied from the DC conversion inverter 84. As the capacitor 82, a known storage battery such as a lithium ion battery can be used. The AC inverter 85 is an inverter that converts the DC power output from the capacitor 82 into AC power.

The switch 88 is controlled by the control unit 86, and switches the power supply source of the water supply device 100 between the commercial power supply 90 (first power supply source) and the capacitor 82 (second power supply source). In the second embodiment, the switch 88 supplies the AC power supplied from the commercial power source 90 to the water supply device 100 at the normal time when the power is supplied from the commercial power source 90 to the power storage device 80. On the other hand, the switch 88 supplies the AC power output from the AC inverter 85 to the water supply device 100 in the event of a power failure when power is not supplied from the commercial power source 90 to the power storage device 80.

The control unit 86 controls the DC inverter 84, the AC inverter 85, and the switch 88. The control unit 86 controls the switch 88 in response to a power failure of the commercial power source 90 to continue the power supply to the water supply device 100. Further, the control unit 86 determines whether the switch 88 is connected, that is, whether the power supply source of the water supply device 100 is selected as the commercial power source 90 or the capacitor 82, and the state of the capacitor 82 (for example, the remaining amount of electricity stored). ) Is transmitted to the control unit 40 of the water supply device 100 via the signal line 89. The control unit 40 may display the received state of the capacitor 82 with the lamp 512e.

The control unit 40 of the water supply device 100 of the second embodiment receives a signal from the control unit 86 of the power storage device 80 informing that the power supply source of the water supply device 100 has been switched from the commercial power source 90 to the storage device 82. , In FIG. 3, it is determined that the second control mode is requested (S100: Yes). Then, the control unit 40 executes the second control mode. Here, in the present embodiment, it is preferable that the control unit 40 sets at least one set value smaller than the set value of the first control mode in steps S211 to S216 in FIG. By such control, in the water supply device 100 of the second embodiment, when power is supplied from the power storage device 82 to the water supply device 100, that is, when the commercial power supply 90 has a power failure, the water supply device 100 secures water supply to the water supply target. The power consumed by the water supply can be reduced. However, in steps S211 to S216 in FIG. 4, the set values of all the control numerical values may be equal to the values of the first control mode, or one or more set values may be larger than the set values of the first control mode. ..

Then, when the commercial power supply 90 is restored while the water supply device 100 is being supplied with power by the condenser 82, a signal informing that the power supply source of the water supply device 100 has been switched from the condenser 82 to the commercial power supply 90 is stored. It is input from the control unit 86 of the apparatus 80, and in FIG. 3, the control unit 40 has no request for the second control mode (S100: No), and the previous control mode is the second control mode (S112: Yes). The determination is made, and the switching control process S114 is executed.

Further, if the power failure of the commercial power supply 90 continues for a long time, the condenser 82 is consumed, the power supply of the water supply device 100 is cut off, and the water supply destination building is cut off. After that, when the commercial power supply 90 is restored and the water supply device 100 is restored, the control mode is the first control mode, and as shown in FIG. 8, the control unit 40 is not requested to use the second control mode (S100: No), it is determined that the control mode at the time of power failure = the second control mode (S112A: No). Then, the switching control process S114 is executed. Here, when the water supply device 100 is installed or maintained, and then the power is restored after the water supply device 100 is cut off, the emergency power supply is not used as the power supply source of the water supply device 100, and the control mode at the time of the power failure. Is the first control (step S112A = Yes). Normally, a power outage due to the installation or maintenance of the water supply device 100 is planned in advance and announced by the maintenance person to the water supply destination. Therefore, it is unlikely that the water supply amount will suddenly change when the power is restored due to a power outage due to these factors. On the other hand, when the water supply device 100 recovers power after the emergency power supply is used due to a disaster or the like, there is a concern that the water user may suddenly increase the demand or change the water supply amount as described above. The control unit 40 stores the control mode at the time of a power failure (S130A), and determines whether or not to perform the switching control process according to the control mode at the time of the power failure (S112A). Therefore, the water supply device 100 of the present embodiment can supply water more appropriately.

In the second embodiment, the power supply source of the water supply device 100 is switched between the commercial power supply 90 and the condenser 82. However, instead of or in addition to this, the water supply device 100 may be able to supply power from the generator as an emergency power source used when there is no power supply from the commercial power source 90 to the water supply device 100. Then, when the power supply source of the water supply device 100 is switched from the commercial power source 90 to the generator based on the input from the generator or other external device, the control unit 40 of the water supply device 100 requests the second control mode. (S100: Yes in FIG. 3) may be determined. Then, when switching from the second control mode in which power is supplied by the generator to the first control mode in which power is supplied by the commercial power source 90 (S112: No in FIG. 3), the switching control process is executed ( S114) in FIG. Further, after the power failure of the commercial power supply 90 continued for a long time and the generator was consumed and the power supply of the water supply device 100 was cut off, when the commercial power supply 90 was restored, the second control mode was switched to the first control mode. It is preferable that the switching control process is executed (S114 in FIG. 3) as (S112: No in FIG. 3).

Generally, the water supply device 100 is installed in each building. Therefore, in an area where buildings in the city center are densely packed, a large number of water supply devices are installed in the area. When a large-scale power outage occurs in such an area due to a natural disaster or the like, the water main pressure drops due to a sudden increase in the amount of water supplied after the power outage is restored, or a large amount of power is generated by the rapid acceleration of the pump 2. There is a concern that the power will be consumed and the unstable power will be insufficient again immediately after the power is restored, resulting in a power outage. Therefore, it is preferable that the low output control mode or the slow change control mode is executed as the switching control process in S114 of FIG. As a result, it is possible to suppress a rapid increase in the amount of water supply in the area.

In addition, if there are few buildings in the area where the water supply device 100 is installed, if the building height is low and the total head is low, or if the number of units is small and the amount of water supply or power consumption is small, the water supply device 100 will be more than usual. Even if the output of the water supply device is high, it does not affect the water main pressure or power shortage. Therefore, it is preferable that the high output control mode or the sudden change control mode is executed as the switching control process in S114 of FIG. As a result, the water supply device 100 can cope with the temporarily increasing amount of water supply in the building.

As described above, the optimum control mode in the switching control process of S114 in FIG. 3 differs depending on the environment in which the water supply device 100 is installed and the scale of the building to which the water supply is supplied. Therefore, the operator selects each mode of the switching control process by changing the setting on the display panel 51 or by using an operation switch (not shown), and each mode of the selected switching control process is displayed on the lamp 512c. It is good.

In the above description, the estimated end pressure constant control using the control lift curve for the rotation speed control of the pump 2 has been described, but the same applies to the case where the rotation speed control of the pump 2 is the constant pressure control or the end pressure constant control. .. Specifically, in the control lift curve, when the pressure at zero flow rate and the pressure at the maximum flow rate are equal (for example, PA1 = PB1), the pressure is controlled to be constant, and the pressure sensor 26 is the pressure of the water faucet 10a at the end. If is measured, the terminal pressure will be controlled constantly. In this case, without using the control lift curve, in the second control mode, the set pressures Pt1, Pt2, Pt3 (Pt0> Pt1> Pt2> Pt3) lower than the set pressure Pt0 in the first control mode are used to reduce the pressure. It is preferable that the power control is executed and the set pressure is switched by the ECO button 519 or the like of the operation panel 51 and displayed by the corresponding ECO lamp 512b (H, M, L).

Although the embodiments of the present invention have been described above, the embodiments of the invention described above are for facilitating the understanding of the present invention and do not limit the present invention. The present invention can be modified and improved without departing from the spirit thereof, and it goes without saying that the present invention includes an equivalent thereof. In addition, any combination of embodiments and modifications is possible within a range that can solve at least a part of the above-mentioned problems, or a range that exhibits at least a part of the effect, and is described in the claims and the specification. Any combination of each component or omission is possible.

2 ... Pump 3 ... Motor 20 ... Inverter 30 ... Control unit 40 ... Control unit 46 ... Setting unit 47 ... Storage unit 48 ... Calculation unit 49 ... Display unit 50 ... I / O unit 51 ... Operation panel 60 ... Communication unit 80 ... Power storage Device 82 ... Capacitor 84 ... DC inverter 85 ... AC inverter 86 ... Control unit 88 ... Switch 90 ... Commercial power supply 100 ... Water supply device 516 ... Setting button 519 ... ECO button

Claims (18)

A control unit for controlling a water supply device including a pump that pressurizes and transfers water and a drive unit that drives the pump.
The control unit has, as a control mode, a first control mode and a second control mode in which power consumption is smaller than that of the first control mode.
When the control unit switches from the second control mode to the first control mode, the control unit controls the pump by a switching control process in which the change in the output of the pump is different from that of the first control mode.
In the switching control process, when the pump is operating, the control unit uses the pump even if the pump is in a small water volume state from the start of the switching control process until a predetermined time elapses. Force driving,
Controller unit. A control unit for controlling a water supply device including a pump that pressurizes and transfers water and a drive unit that drives the pump.
The control unit has, as a control mode, a first control mode and a second control mode in which power consumption is smaller than that of the first control mode.
When the control unit switches from the second control mode to the first control mode, the control unit controls the pump by a switching control process in which the change in the output of the pump is different from that of the first control mode.
In the switching control process, the pump is controlled in the switching control mode.
The switching control mode is a control unit having a rapid change control mode in which the discharge flow rate of the pump changes more rapidly than the first control mode. In the sudden change control mode, the control unit is used as a numerical value for controlling the pump.
A control lift curve whose tangential slope of the control lift curve at a predetermined flow rate is larger than the tangential slope of the standard control lift curve of the first control mode.
A set pressure at which the rate of change between predetermined flow rates is greater than the set pressure of the pump when driving the pump in the first control mode,
The number of operating pumps is larger than the number of operating pumps in the first control mode, and
The control unit according to claim 2, wherein at least one of the proportional gains larger than the proportional gain used to set the control command to the pump in the first control mode is set. A control unit for controlling a water supply device including a pump that pressurizes and transfers water and a drive unit that drives the pump.
The control unit has, as a control mode, a first control mode and a second control mode in which power consumption is smaller than that of the first control mode.
When the control unit switches from the second control mode to the first control mode, the control unit controls the pump by a switching control process in which the change in the output of the pump is different from that of the first control mode.
In the switching control process, the pump is controlled in the switching control mode.
The switching control mode is a control unit having a slow change control mode in which the discharge flow rate of the pump changes more slowly than the first control mode. In the slow change control mode, the control unit is used as a numerical value for controlling the pump.
A control lift curve whose tangential slope of the control lift curve at a predetermined flow rate is smaller than the tangential slope of the standard control lift curve of the first control mode.
A set pressure in which the rate of change between predetermined flow rates is smaller than the set pressure of the pump when driving the pump in the first control mode.
The number of operating pumps is smaller than the number of operating pumps in the first control mode, and the number of operating pumps is smaller than the number of operating pumps.
The control unit according to claim 4, wherein at least one of the proportional gains smaller than the proportional gain used to set the control command to the pump in the first control mode is set. The control unit has a plurality of the switching control modes, and at least one of the plurality of switching control modes is selected.
The control unit according to any one of claims 2 to 5. The control unit ends the switching control process when at least one of the first condition in which the predetermined time elapses and the second condition in which the pump stops the small amount of water is satisfied in the switching control process. , The control unit according to any one of claims 1 to 6. A control unit for controlling a water supply device including a pump that pressurizes and transfers water and a drive unit that drives the pump.
The control unit has, as a control mode, a first control mode and a second control mode in which power consumption is smaller than that of the first control mode.
When the control unit switches from the second control mode to the first control mode, the control unit controls the pump by a switching control process in which the change in the output of the pump is different from that of the first control mode.
The control unit is a control unit that executes the switching time control process for a longer period as the period in which the drive unit is controlled by the second control mode is longer. The control unit can display the current control mode and / and the switching control mode by a display, and the current duration of the control mode and / and the switching control mode and the current switching control mode. At least one of the control mode and / and the estimated time until the switching control mode is changed can be displayed.
The control unit according to any one of claims 2 to 6 . The drive unit of the water supply device can drive the pump using a first electric power supplied from a commercial power source or a second electric power supplied from an emergency power source.
When the pump is driven by the first electric power, the control unit controls the drive unit by the first control mode, and when the pump is driven by the second electric power, the control unit is driven by the second control mode. Control the part,
The control unit according to any one of claims 1 to 9 . The control unit is
After the switching control process, the pump is controlled by the first control mode.
The control unit according to any one of claims 1 to 10 . A water supply device equipped with the control unit according to any one of claims 1 to 11 . A control unit for controlling a water supply device including a pump that pressurizes and transfers water and a drive unit that drives the pump.
The drive unit of the water supply device can drive the pump using a first electric power supplied from a commercial power source or a second electric power supplied from an emergency power source.
The control unit has, as a control mode, a first control mode in which the pump is driven by the first electric power and a second control mode in which the pump is driven by the second electric power.
When the control unit switches from the second control mode to the first control mode, the control unit controls the pump by a switching control process in which the change in the output of the pump is different from that of the first control mode .
In the switching control process, when the pump is operating, the control unit uses the pump even if the pump is in a small water volume state from the start of the switching control process until a predetermined time elapses. Force driving,
Controller unit. A control unit for controlling a water supply device including a pump that pressurizes and transfers water and a drive unit that drives the pump.
The drive unit of the water supply device can drive the pump using a first electric power supplied from a commercial power source or a second electric power supplied from an emergency power source.
The control unit has, as a control mode, a first control mode in which the pump is driven by the first electric power and a second control mode in which the pump is driven by the second electric power.
When the control unit switches from the second control mode to the first control mode, the control unit controls the pump by a switching control process in which the change in the output of the pump is different from that of the first control mode.
In the switching control process, the pump is controlled in the switching control mode.
The switching control mode is a control unit having a rapid change control mode in which the discharge flow rate of the pump changes more rapidly than the first control mode. A control unit for controlling a water supply device including a pump that pressurizes and transfers water and a drive unit that drives the pump.
The drive unit of the water supply device can drive the pump using a first electric power supplied from a commercial power source or a second electric power supplied from an emergency power source.
The control unit has, as a control mode, a first control mode in which the pump is driven by the first electric power and a second control mode in which the pump is driven by the second electric power.
When the control unit switches from the second control mode to the first control mode, the control unit controls the pump by a switching control process in which the change in the output of the pump is different from that of the first control mode.
In the switching control process, the pump is controlled in the switching control mode.
The switching control mode is a control unit having a slow change control mode in which the discharge flow rate of the pump changes more slowly than the first control mode. The switching control process is
It has a plurality of switching control modes, and at least one of the plurality of switching control modes can be selected.
The control unit according to claim 14 or 15 . The control unit according to any one of claims 13 to 16 , wherein the control unit controls the pump by the first control mode after the switching control process. A water supply device equipped with the control unit according to any one of claims 13 to 17 .

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