WO2016030975A1 - Dispositif d'alimentation en eau - Google Patents

Dispositif d'alimentation en eau Download PDF

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Publication number
WO2016030975A1
WO2016030975A1 PCT/JP2014/072355 JP2014072355W WO2016030975A1 WO 2016030975 A1 WO2016030975 A1 WO 2016030975A1 JP 2014072355 W JP2014072355 W JP 2014072355W WO 2016030975 A1 WO2016030975 A1 WO 2016030975A1
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WO
WIPO (PCT)
Prior art keywords
temperature
water supply
time
electric motor
inverter
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PCT/JP2014/072355
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English (en)
Japanese (ja)
Inventor
敏夫 富田
大久保　智文
清巳 田島
佐野　正浩
Original Assignee
株式会社日立産機システム
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Application filed by 株式会社日立産機システム filed Critical 株式会社日立産機システム
Priority to JP2016545130A priority Critical patent/JP6268299B2/ja
Priority to CN201480080998.9A priority patent/CN106574624B/zh
Priority to PCT/JP2014/072355 priority patent/WO2016030975A1/fr
Publication of WO2016030975A1 publication Critical patent/WO2016030975A1/fr

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/06—Control using electricity
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D15/00—Control, e.g. regulation, of pumps, pumping installations or systems

Definitions

  • the present invention relates to a water supply apparatus using a plurality of pumps that are driven by a plurality of inverters that are respectively speed-controlled by electric motors.
  • a clock timer unit
  • the clock must always be energized or provided with a battery or a battery. Even when the battery is provided, the time information may be lost if a power failure occurs when the battery reaches the end of its life.
  • This invention aims at performing time management of a water supply apparatus without using a timer unit.
  • the present invention includes a plurality of means for solving the above-described problems.
  • the temperature of the motor housing is detected by a temperature detector provided in the inverter, and the detected temperature and the operating state of the motor are used.
  • the time is estimated based on the calculated temperature change.
  • control according to time can be performed without using a timer unit, and stable water supply can be performed.
  • Example 1 is a water supply apparatus using a pump driven by an electric motor whose speed is controlled by an inverter.
  • the inverter is attached to a part of a housing that forms the outer periphery of the armature of the electric motor, and the inverter
  • the temperature of the housing is detected using a temperature detector provided in the housing. Then, the temperature of the housing is detected using the temperature detector, the operating state of the motor is judged from the load current value of the motor and the rotational speed of the motor, and the time is estimated from the detected temperature and the operating state of the motor. It is.
  • the load value is suddenly changed (a sudden increase in the amount of water used), or the minimum value of the motor speed is set low.
  • Energy-saving operation is performed during times when water is not used. That is, the time is estimated from the housing temperature, and suitable control according to the time is performed.
  • FIG. 1 is a diagram showing an external view in which an electric motor for driving a pump and an inverter are integrated.
  • reference numeral 1 denotes a cover that covers the outer periphery of the synchronous motor main body
  • 2 denotes a cooling cover 2 that will be described later
  • cooling covers 2 and 3 that incorporate a cooling fan 25 are attached to the outer peripheral surface of the cover 1.
  • 4 is a terminal box with a built-in noise filter
  • 5 is an end bracket
  • 6 is a rotating shaft formed integrally with the rotor of the electric motor.
  • FIG. 2 shows a development view of the motor part and the inverter part housed in the cover 1 described above.
  • 9 is an electric motor housing, and cooling fins 22 are formed on a part of the outer peripheral surface thereof.
  • a stator and a rotor of an electric motor are inserted inside the housing 9, and 24 is an end attached to the end of the housing 9 on the side opposite to the end bracket 5 described above.
  • a bracket 25 is a cooling fan attached to the rotary shaft 6 outside the end bracket 24.
  • the inverter 7 is attached to the flat surface 23 of the housing 9 through an opening 21 provided in a part of the cover 1, and then the cover 3 for protecting the inverter 7 is attached from the outside.
  • the inverter has a power switching element that is a heat generating element, a temperature detector is provided for the purpose of monitoring and protecting the heat generation state.
  • Reference numeral 26 denotes a control board case, and 27 denotes a smoothing capacitor case.
  • the cooling cover 2 mentioned above is attached to the other edge part (left end of a figure) of the housing 9.
  • symbol 8 in a figure has shown the small hole for taking in external air formed in mesh shape in the approximate center part of the wall surface of the said cooling cover 2.
  • the inverter 7 is directly attached to a part of the flat surface 23 of the housing 9 of the electric motor.
  • the inverter 7 is thermally integrated with a housing made of a material having excellent heat conductivity, and is installed inside the inverter.
  • the temperature of the inverter and the housing can be managed integrally with a certain temperature detector.
  • reference numerals 10-1, 10-2, and 10-3 denote pumps. It is driven by an electric motor indicated by 20-1, 20-2, 20-3.
  • the number 1 pump, the number 2 pump, the number 3 pump, and the number 1 motor, the number 2 motor, and the number 3 motor are referred to from the smaller number.
  • the suction side of these pumps is connected to the water source side via a suction pipe denoted by 11.
  • the water source side receives water from a water main (not shown) in the direct connection system, and receives water from a water receiving tank (not shown) in the water receiving tank system.
  • Reference numeral 17 denotes a pressure detection means that is provided in the water supply pipe 15 and generates an electrical signal in accordance with the pressure. Based on the detection value of the pressure detection means, the pump discharge pressure is controlled (for example, discharge pressure constant control, estimated terminal pressure constant control).
  • the demand side when the end of the water supply pipe 15 is a direct-feed type, it is connected to the demand side water supply pipe and supplied to a faucet of an apartment house, for example. In the case of a high water tank type, it is connected to this demand side water supply pipe to supply water to the high water tank.
  • Reference numeral 18 denotes a pressure tank provided in the water supply pipe 15 for suppressing rapid pressure fluctuations.
  • the No. 1 inverter, No. 2 inverter, No. 3 inverter indicated by 30-1, 30-2, and 30-3 are supplied with power from the power source side, and indicated by 32-1, 32-2, and 32-3, respectively.
  • the rotational speeds of the motors 20-1, 20-2, 20-3 are changed and driven.
  • Reference numerals 31-1, 31-2, 31-3 denote arithmetic processing units, and 34-1, 34-2, 34 according to the control parameters stored in the storage units indicated by 33-1, 33-2, 33-3.
  • the electric motors 20-1, 20-2, 20-3 are operated / stopped and the rotational speed is changed according to the signal input from the signal processing unit indicated by -3.
  • Reference numeral 41 denotes an arithmetic processing unit which controls the number of operating pumps according to a signal input from the signal processing unit 44 according to a control parameter stored in the storage unit 43.
  • the control device 40 and the inverters 30-1, 30-2, 30-3 are connected by communication / control lines denoted by 50-1, 50-2, 50-3, respectively, and the control device 40 and the inverters 30-1, 30- 2, exchanges signals necessary for control of 30-3.
  • FIG. 4 shows a circuit configuration diagram of the power converters 32-1, 32-2, and 32-3 (represented by reference numeral 32 in FIG. 4) according to the present invention.
  • the input AC power is converted into DC power by the forward converter 61.
  • the converted DC power is smoothed by the smoothing capacitor 62, and then converted into AC power of an arbitrary frequency by an inverse converter 63 constituted by a power switching element, so that the rotating electrical machine 20 (20-1, FIG. 3). 20-2, 20-3).
  • the inverse converter is driven by a drive circuit 67.
  • the temperature information detected by the temperature detector 66 is input to the control circuit 64, and the drive circuit 67 is controlled by a command from the control circuit 64 to increase or decrease the speed.
  • Various settings can be made by the operation display unit 65 connected to the control circuit 64.
  • the smoothing capacitor 62 is stored in the capacitor case 27, and the control circuit 64 is stored in the control board case 26, and is structurally disposed at a position away from the power conversion case 3.
  • FIG. 5 shows the contents of the volatile memory and the nonvolatile memory stored in the storage unit in the control board of the inverter. In addition, it does not have a memory
  • FIG. 5A shows the contents stored in the volatile memory in the storage unit.
  • the current pump discharge side pressure DpN is stored at address 1001 of the volatile memory.
  • Address 1002 stores the speed (output operating frequency) HzN currently commanded by the inverter to the motor, and address 1003 stores the current output current value (load current value of the motor) AmN of the inverter. . It is possible to estimate the inverter load status and hence the amount of water output from the pump from HzN and AmN. From the DpN and the amount of water estimated from HzN and AmN, the operating point of the pump (discharge side pressure, amount of water used) can be determined. can do.
  • a value detected by the temperature detection means is stored at address 1004 as the current temperature detection value TeN.
  • Address 1005 stores the current minimum command speed (minimum frequency) HLN set in the minimum command speed setting process described later.
  • the remaining time TN1 of the temperature measurement cycle management timer is stored at address 1006.
  • the remaining time TN2 of the operation state measurement cycle management timer is stored at address 1007.
  • Address 1008 stores the current time (elapsed time from midnight) TiN, which is set in a time setting process described later.
  • An elapsed time TeS from the start of temperature measurement is stored at address 1009.
  • the temperature of the motor and inverter changes not by the load at the moment when the temperature is detected, but by the integration of the load state up to that point. For this reason, the integrated value HzS of the command speed measured at the operating state measurement cycle is stored at address 1101, and the value (average value) HzA obtained by dividing the integrated value HzS by the averaging number AvC described later is stored at address 1102. . Similarly, with respect to the current value, the integrated value AmS of the output current value measured at the operating state measurement cycle is stored at address 1201, and the integrated value AmS is divided by the averaging count AvC (average value) at address 1202. Store AmA.
  • a determination flag TeF for executing a temperature determination process described later when the temperature measurement period is reached is stored.
  • TeF the temperature determination process is not executed, and when TeF is 1, the temperature determination process is performed.
  • FIG. 5B shows the contents stored in the nonvolatile memory in the storage unit.
  • the target discharge side pressure DpL at zero water volume is stored at address 2001 in the non-volatile memory, and the target discharge side pressure DpH at the specified water volume is stored at address 2002.
  • DpL is the value obtained by subtracting the pipe resistance from the customer specification pressure, so that DpL ⁇ DpH .
  • the command speed (minimum speed) when the water volume is zero is stored.
  • the command speed HzL at night water amount zero is stored
  • the command speed HzD at normal water amount zero is stored
  • the command speed HzM at morning and evening water amount zero is stored.
  • the command speed (maximum frequency) HzH at the specified water volume is stored at address 2014.
  • Address 2021 stores the motor cooling capacity (cooling fan cooling capacity) CoK.
  • the number of rotations of the cooling fan also changes according to the number of rotations of the motor (inverter command speed).
  • the constant k1 is used in a certain number of rotations range, and the cooling amount is set to HzA ⁇ CoK ⁇ k1.
  • ⁇ ⁇ ⁇ ⁇ ⁇ Equation 1 Can be approximated as: Alternatively, it may be approximated by a higher-order equation over the entire rotation speed range.
  • the address 2022 stores a temperature increase coefficient (temperature increase amount with respect to load current) WaK of the electric motor.
  • the temperature rise of the motor and inverter varies depending on the output current value (load current value), and the constant k2 is used to set the temperature rise amount to AmA x WaK x k2 ...
  • Formula 2 Can be approximated as: It can be approximated by a higher order expression more accurately.
  • TM1 Stored at the address 2031 is a temperature measurement cycle management timer set time (temperature measurement cycle) TM1.
  • Stored at address 2032 is a set time (cycle for measuring the driving state) TM2 of the driving state measuring cycle management timer.
  • Address 2033 stores a set time TeT from the start of temperature measurement until the time is determined.
  • the address 2101 stores the command speed and the number of times AvC for averaging the output current value.
  • the averaging number AvC is preferably set equal to the number of times of measuring the command speed and the output current value while measuring the temperature once.
  • the averaging number AvC is preferably set to be equal to or more than the number of times of measuring the command speed and the output current value while measuring the temperature once.
  • the averaging count AvC is set to be equal to the number of times the command speed and output current value are measured while measuring the temperature once, and when the measurement count reaches the averaging count AvC. It is desirable to store the temperature detection value TeN, the command speed and the average value of the output current HzA, AmA, and reset the integrated value HzS, AmS of the command speed and the output current value.
  • the determination temperature (ambient temperature) T01T determined by the temperature determination process described later at the first temperature detection (time 1), the command speed T01H at the time 1 at the address 3012, and the time 1 at the address 3013
  • the output current value T01A at is stored.
  • the change in temperature due to the weather (sunshine) is large, so the measurement is performed 72 times so that the time is accurately determined regardless of the weather.
  • the start time PT1S of the first time zone (for example, morning) when the load increases is stored at address 4001, and the end time PT1E of the first time zone when the load increases is stored at address 4002.
  • the start time PT2S of the second time zone (for example, evening) when the load increases is stored at address 4003, and the end time PT2E of the second time zone when the load increases is stored at address 4004.
  • the start time ST1S of the first time zone eg, nighttime
  • the end time ST1E of the first time zone when the load decreases is stored at address 4102.
  • the start time ST2S of the second time zone in which the load decreases (for example, after noon) is stored at address 4103, and the end time ST2E of the second time zone in which the load decreases is stored at address 4104.
  • the temperature measurement cycle is about 30 to 60 minutes.
  • TJu Stored at address 5001 is a flag TJu indicating that the time determination has been completed.
  • the minimum command speed setting process described later is executed after confirming that TJu is 1 (time determination has been completed).
  • FIG. 6 is a main control processing flowchart of the present embodiment.
  • initialization processing of various functions is performed in 100 steps, and each control from 200 steps to 800 steps is repeatedly executed.
  • communication control processing between the control device and the inverter is performed.
  • signals are exchanged using communication / control lines indicated by 50-1, 50-2, and 50-3 in FIG.
  • step 300 a temperature measurement process is performed, and when the temperature measurement cycle is reached, the temperature determination process is performed.
  • step 400 an operation state measurement process is performed. When the operation state measurement cycle is reached, a process for storing the command speed and the output current value is performed.
  • step 500 a temperature determination process is performed, and a determination temperature (ambient temperature) is calculated and stored from the temperature detection value, the command speed, and the output current value.
  • step 600 a time setting process is performed, and the time is estimated and set based on the relationship between a plurality of temperature determination results (a plurality of determination temperatures).
  • step 700 the set time is compared with the time of increase or decrease of the load stored in advance, and processing for changing the minimum command speed is performed in a time zone where the load fluctuates from the normal time.
  • pump control processing is performed.
  • the estimated terminal pressure constant control and discharge pressure constant control are mainly performed.
  • the pump discharge side pressure is controlled to the customer desired pressure by the change of the rotation speed by the inverter. .
  • the second pump starts operation, and the demand is satisfied by parallel operation.
  • FIG. 7 is a process flow diagram of the temperature measurement process.
  • step 310 it is determined whether the remaining time TN1 of the temperature measurement cycle management timer is 0. If TN1 is 0, the process proceeds to step 311.
  • the temperature detected by the temperature detector in step 311 is stored in the current temperature detection value TeN, and the execution flag TeF of the temperature determination process is set to 1 (execution) in step 312.
  • step 313 the temperature measurement cycle management timer set value TM1 is set in the remaining time TN1 of the temperature measurement cycle management timer, and the process returns to the main control flow.
  • the reason why TM1 is set to TN1 in step 313 is to perform temperature measurement again after the period TM1.
  • step 310 If the remaining time TN1 of the temperature measurement cycle management timer is not 0 in step 310, the remaining time TN1 of the temperature measurement cycle management timer is counted down and stored in step 314. Thereafter, the process returns to the main control flow.
  • FIG. 8 is a process flow diagram of the operation state measurement process.
  • step 410 it is determined whether the remaining time TN2 of the operation state measurement cycle management timer is 0. If TN2 is 0, the process proceeds to step 411.
  • step 411 the speed (command speed, output frequency) HzN currently instructed by the inverter to the electric motor is stored, and in step 412 HzN is added to the integrated value HzS of the command speed to update HzS.
  • the current value (load current value) AmN that the inverter is currently outputting to the electric motor is stored.
  • step 414 AmN is added to the integrated value AmS of the output current value, and AmS is updated.
  • step 415 the operation state measurement cycle timer set value TM2 is set in the remaining time TN2 of the operation state measurement cycle management timer, and the process returns to the main control flow.
  • the reason why TM2 is set to TN2 in step 415 is to perform the operation state measurement process again after the period TM2.
  • step 410 If the remaining time TN2 of the operation state cycle management timer is not 0 in step 410, the remaining time TN2 of the operation state measurement cycle management timer is counted down and stored in step 416. Thereafter, the process returns to the main control flow.
  • FIG. 9 is a process flow diagram of the temperature determination process.
  • step 510 it is determined whether the execution flag TeF of the temperature determination process is 1 (execution). If TeF is 1 (execution), the process proceeds to step 511. If TeF is 0 (none), the process proceeds to the main control flow. Return.
  • step 511 the command speed average value HzA is calculated from the command speed integrated value HzS and the averaging count AvC.
  • HzA HzS ⁇ AvC ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ Equation 3
  • step 512 the cooling amount is calculated from the average value HzA of the command speed and the cooling coefficient CoK (Equation 1).
  • step 513 the average value AmA of the output current values is calculated from the integrated value AmS of the output current values and the averaging count AvC.
  • AmA AmS ⁇ AvC ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ Equation 4
  • step 514 the temperature rise amount is calculated from the average value AmA of the output current and the temperature rise coefficient WaK (Formula 2).
  • step 515 the integrated value HzS of the command speed is returned to 0, and in step 516, the integrated value AmS of the output current value is returned to 0.
  • a determination temperature is calculated from the current temperature detection value TeN, the cooling amount and the temperature increase amount obtained from equations 3 and 4, and if it is the first determination, it is stored in the determination temperature T01T at time 1, and the determination n If it is the second time, it is stored in the determination temperature TnT at time n.
  • (Judgment temperature) TeN ⁇ (temperature rise amount) + (cooling amount) Equation 5
  • the temperature determination process execution flag TeF is set to 0 (none), and the process returns to the main control flow.
  • FIG. 10 is a process flow diagram of the time setting process.
  • step 610 it is determined whether the temperature measurement elapsed time TeS has reached the temperature measurement time TeT. If it has reached, the process proceeds to step 611, and if not, the process returns to the main control flow.
  • step 611 data having the highest value among the determination temperatures is set as a time “3 pm (900 minutes have elapsed since midnight)”. 0:00 pm is calculated from the difference between the time set at “3 pm” in step 612 and the current temperature measurement elapsed time TeS.
  • 4320-2340 1980 ... 8 Since one day is 1440 minutes (24 hours), if the solution of Equation 8 is 1440 or more, 1440 is subtracted.
  • 1980-1440 540 Equation 9 Therefore, it can be calculated as 9:00 am from 540 minutes (9 hours).
  • step 614 the time determination completion flag TJu is set to 1 (completed).
  • step 615 the temperature measurement elapsed time TeS is returned to 0, and the process returns to the main control flow.
  • the extraction method of “3 pm” in step 612 is the highest determination temperature
  • FIG. 11 is a process flow diagram of the minimum command speed setting process.
  • step 710 it is determined whether the time determination completion flag TJu is 1 (completed). If TJu is 1 (completed), the process proceeds to step 720. If TJu is 0 (incomplete), the process proceeds to step 763.
  • step 720 it is determined whether or not the current time TiN is a time zone between PT1S and PT1E set as a time zone in which the load increases. If TiN is between PT1S and PT1E, the processing proceeds to step 761. If the time zone is not between PT1S and PT1E, the process proceeds to step 730. Similarly, in step 730, it is determined whether the current time TiN is a time zone between PT2S and PT2E set as a time zone in which the load increases. If TiN is between PT2S and PT2E, If it is determined that the time period is not between PT2S and PT2E, the process proceeds to step 740.
  • step 740 it is determined whether the current time TiN is a time zone between ST1S and ST1E set as a time zone in which the load decreases. If TiN is between ST1S and ST1E, the flow proceeds to step 762. If the time zone is not between ST1S and ST1E, the process proceeds to step 750. Similarly, in step 750, it is determined whether the current time TiN is a time zone between ST2S and ST2E set as a time zone in which the load decreases. If TiN is between ST2S and ST2E, If it is not the time zone between ST2S and ST2E, it will progress to 763 step.
  • the current minimum command speed HLN is set to the command speed (minimum morning and evening frequency) HzM in the morning and evening water volume, and the process returns to the main control flow.
  • the command speed (minimum frequency at night) HzL is set to the current minimum command speed HLN, and the flow returns to the main control flow.
  • the current minimum command speed HLN is set to a normal command speed (normal minimum frequency) HzD at zero water volume, and the process returns to the main control flow.
  • the time is obtained by the same method as in the first embodiment, but the time zone during which the load increases / decreases is not input in advance from addresses 4001 to 4104, but addresses 3011 to 3723.
  • the load increase / decrease is determined on the basis of the output current value stored at each time, and the time zone during which the load increases / decreases is automatically stored from address 4001 to address 4104.
  • the control when setting the time periodically, the control always refers to the most recent load state by reviewing (resetting) the time zone during which the load increases / decreases each time the time is set. Is possible.
  • the reference value for determining the increase / decrease in load based on the output current value at each time may be preset in the volatile memory, but the average value of the stored output current values at each time, Alternatively, it is desirable to obtain the reference value by calculation based on the median.
  • the second pump starts operation, and the demand is increased in parallel operation.
  • a confirmation time is provided before starting the parallel operation.
  • the confirmation time until the start of the parallel operation is preferably set to a shorter confirmation time than usual so as to prevent the pressure from decreasing in the time when the load increases.
  • the time is determined in the control device, and the set value of the time and the set value of the minimum command speed are transmitted to each inverter through the communication / control line.
  • FIG. 12 shows the contents of the nonvolatile memory stored in the storage unit in the control board of the control device. In addition, it does not have a memory
  • the contents of the volatile memory from address 2001 to address 2101 and from address 4001 to address 5001 are the same as the contents stored in the inverter.
  • the control board determines the time based on the average value of these determination temperatures, and sets the minimum command speed according to the time.
  • the time in the control device By determining the time in the control device, it is possible to operate at a time standardized for all inverters and a minimum command speed corresponding to the time. Furthermore, the time can be determined more accurately by increasing the temperature data to be detected.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Control Of Non-Positive-Displacement Pumps (AREA)
  • Control Of Positive-Displacement Pumps (AREA)

Abstract

La présente invention permet de réaliser une gestion temporisée pour un dispositif d'alimentation en eau sans utiliser une unité de temporisateur dans un dispositif d'alimentation en eau. L'invention concerne un dispositif d'alimentation en eau ayant une pluralité de pompes, une pluralité de moteurs électriques pour entraîner en rotation respectivement la pluralité de pompes, une pluralité de ventilateurs de refroidissement respectivement fixés à la pluralité de moteurs électriques, une pluralité d'onduleurs pour faire varier respectivement les vitesses de rotation de la pluralité de moteurs électriques, et un dispositif de commande pour commander le fonctionnement/désactivation de la pluralité d'inverseurs. Le dispositif d'alimentation en eau est caractérisé en ce que : la pluralité d'inverseurs sont chacun fixés à une partie d'un boîtier formant une périphérie externe d'une armature de chacun de la pluralité de moteurs électriques, et configurés pour détecter la température du boîtier avec un détecteur de température disposé dans l'onduleur; et que le dispositif de commande détecte les températures des boîtiers de la pluralité de moteurs électriques ou les températures de la pluralité d'onduleurs en utilisant les détecteurs de température, et estime le temps sur la base des températures détectées et les états de fonctionnement des moteurs électriques.
PCT/JP2014/072355 2014-08-27 2014-08-27 Dispositif d'alimentation en eau WO2016030975A1 (fr)

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JP2016545130A JP6268299B2 (ja) 2014-08-27 2014-08-27 給水装置
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JP2018059485A (ja) * 2016-10-07 2018-04-12 株式会社荏原製作所 給水装置

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