WO2023118089A1 - Dispositif de détection et pompe ou système de pompe doté d'un tel dispositif de détection - Google Patents

Dispositif de détection et pompe ou système de pompe doté d'un tel dispositif de détection Download PDF

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Publication number
WO2023118089A1
WO2023118089A1 PCT/EP2022/086918 EP2022086918W WO2023118089A1 WO 2023118089 A1 WO2023118089 A1 WO 2023118089A1 EP 2022086918 W EP2022086918 W EP 2022086918W WO 2023118089 A1 WO2023118089 A1 WO 2023118089A1
Authority
WO
WIPO (PCT)
Prior art keywords
sensor
sensor device
pump
wireless communication
communication device
Prior art date
Application number
PCT/EP2022/086918
Other languages
English (en)
Inventor
Gert Friis Eriksen
Nicholai ABRAHAMSEN
Original Assignee
Grundfos Holding A/S
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.)
Filing date
Publication date
Application filed by Grundfos Holding A/S filed Critical Grundfos Holding A/S
Publication of WO2023118089A1 publication Critical patent/WO2023118089A1/fr

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Classifications

    • 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
    • F04D15/02—Stopping of pumps, or operating valves, on occurrence of unwanted conditions
    • F04D15/0209—Stopping of pumps, or operating valves, on occurrence of unwanted conditions responsive to a condition of the working fluid
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D13/00—Pumping installations or systems
    • F04D13/02—Units comprising pumps and their driving means
    • F04D13/06—Units comprising pumps and their driving means the pump being electrically driven
    • F04D13/0606—Canned motor pumps
    • 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
    • F04D15/0088—Testing machines
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/40—Casings; Connections of working fluid
    • F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
    • F04D29/426—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for liquid pumps
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K1/00—Details of thermometers not specially adapted for particular types of thermometer
    • G01K1/02—Means for indicating or recording specially adapted for thermometers
    • G01K1/022—Means for indicating or recording specially adapted for thermometers for recording
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K13/00—Thermometers specially adapted for specific purposes
    • G01K13/02—Thermometers specially adapted for specific purposes for measuring temperature of moving fluids or granular materials capable of flow
    • G01K13/026—Thermometers specially adapted for specific purposes for measuring temperature of moving fluids or granular materials capable of flow of moving liquids
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L9/00—Measuring steady of quasi-steady pressure of fluid or fluent solid material by electric or magnetic pressure-sensitive elements; Transmitting or indicating the displacement of mechanical pressure-sensitive elements, used to measure the steady or quasi-steady pressure of a fluid or fluent solid material, by electric or magnetic means
    • G01L9/0041—Transmitting or indicating the displacement of flexible diaphragms
    • G01L9/0072—Transmitting or indicating the displacement of flexible diaphragms using variations in capacitance
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M3/00—Investigating fluid-tightness of structures
    • G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
    • G01M3/26—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors
    • G01M3/28—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for pipes, cables or tubes; for pipe joints or seals; for valves ; for welds
    • G01M3/2807—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for pipes, cables or tubes; for pipe joints or seals; for valves ; for welds for pipes
    • G01M3/2815—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for pipes, cables or tubes; for pipe joints or seals; for valves ; for welds for pipes using pressure measurements

Definitions

  • the present invention relates to a sensor device for measuring at least one property of a liquid in a pump or pump system.
  • a sensor device for measuring at least one property of a liquid in a pump or pump system.
  • a sensor device that can be integrated in a pump without a need for adding electric connections and changing the exterior of the pump.
  • a pump comprising such a sensor device.
  • the present invention has been developed in relation to pumps used for applications where it is needed to monitor the pressure in the liquid being pumped in order to quickly detect a possible leakage in the system. This will be relevant in many systems, such as in heating systems or in domestic hot water systems. However, the invention may find use in any application where it is relevant to measure a property of the liquid by a sensor.
  • the pressure or other property may be measured by sensors arranged in the pipes leading to or from the pump. Then the signals are to be transferred to a controller which may be provided inside the pump or as a separate unit, such as in a computer.
  • the property may also be measured by a sensor arranged inside the pump housing. If the property being measured by the sensor is influenced by the operation of the pump, the measurements may need to be compensated for the pump influence by taking into account different pump parameters, such as rotational speed and power consumption. Alternatively, the relevant property of the liquid can be measured without the influence from the pump by shortly stopping the pump while performing the measurements. If the property of the liquid varies, there will typically be a delay in the measurements causing a lack of reaction that will be disadvantageous at least for some applications.
  • a sensor device for measuring at least one property of a liquid in a pump comprising:
  • a wireless communication device configured to communicate a wireless signal
  • an electric circuit unit having the at least one sensor electrically connected thereto at a first end and the wireless communication device electrically connected thereto at a second end, wherein the electric circuit unit is mounted in liquid-tight engagement with a first opening in a rotor can of the pump, and wherein the sensor device is configured so that during use:
  • the at least one sensor measures the at least one property of the liquid
  • the wireless communication device communicates the wireless signal representative of the output signal to a receiver at a distance therefrom.
  • pump pump system
  • the sensor device comprises more than one sensor, such as a pressure sensor and a temperature sensor.
  • the wireless communication device is a transceiver which is configured to both send and receive signals.
  • the electric circuit unit will typically be a printed circuit board, PCB, but other types may alternatively be used, such as flex print, thick film substrates, or wireframes.
  • electrically connected thereto is preferably meant that the at least one sensor and the wireless communication device are mounted directly on the electric circuit board.
  • the scope of protection also covers embodiments in which they are separate, electrically connected components.
  • liquid-tight engagement is meant that it should be ensured that the liquid in the pump cannot flow through the first opening via the points of engagement. Hereby it is ensured that the liquid does not flow into other parts of the pump, such as into contact with a control unit thereof, or leak out of the pump.
  • the first opening in the rotor can be an opening originally provided for the arrangement of a deblocking screw with which it is possible to release the rotor in case it has got stuck in a given position, e.g. after a period of no operation.
  • Many pumps are provided with such a deblocking screw and by designing the sensor device for arrangement in the same opening, it is possible to provide a pump with a sensor device according to the present invention without having to change the design.
  • a sensor device makes it is possible to measure at least one property of a liquid in a pump without needing to add extra electric connections and at the same time utilizing the already available limited free space inside an existing pump.
  • the wireless signal communicated by the wireless communication device may be a radio signal, a light signal, or an acoustical signal.
  • a radio signal may be defined as an electromagnetic wireless signal with a frequency between 20 kHz and 300 GHz. This frequency range may also be referred to a Radio Frequency, RF.
  • a radio signal may be defined as an electromagnetic wave with a wavelength between 0.5 cm to 30,000 m.
  • the at least one sensor may be configured to measure one or more of the following properties: pressure, temperature, sound, or concentration of a substance contained in the liquid.
  • a substance contained in the liquid may e.g. be glycol added to the liquid if the pump is to be used in low temperature applications.
  • the scope of protection covers any type of sensor as long as the use thereof is not in contradiction with the other features of the invention.
  • a sensor device may further comprise a sensor house housing the at least one sensor, the electric circuit unit, and the wireless communication device, wherein the sensor house:
  • - comprises a second opening or a membrane arranged to communicate with the first opening when the sensor house is mounted to the rotor can, and wherein the wireless communication device during operation communicates the wireless signal to the receiver being arranged outside the sensor house.
  • Such a sensor house will protect the electronic components from moisture and dirt possibly present within the pump. At least a part of the sensor house surrounding the wireless communication device is typically made from an electrically insulating material, such as a polymer or polymer-based material, as that will provide a more efficient and reliable communication of the wireless signal from the wireless communication device to the receiver. Furthermore, due to the protection provided by the sensor house, it is avoided to have to otherwise provide for galvanic isolation of the electronic components as the necessary protection is built into the design of the sensor house.
  • the term “communicate” refers to the ability to transfer the value of the at least one parameter being measured.
  • the membrane is thin enough to reliably and precisely transfer the information about the property being measured, such a membrane may be added e.g. to protect the sensor from possible particles present in the liquid.
  • the sensor house comprises a sensor cup with an inner chamber surrounded by a sensor cup wall, the inner chamber being in liquid communication with the at least one sensor via the second opening or the membrane, and the sensor cup being dimensioned and shaped for extending in a liquid-tight manner through the first opening in the rotor can and into the liquid in the rotor can during use, and the sensor cup is provided with a third opening through which the liquid can flow into the inner chamber during use of the sensor device.
  • the liquid-tight mounting of the sensor cup in the first opening may e.g. be obtained by welding or gluing.
  • the sensor house may have the second opening, and the at least one sensor may be in the form of a capacitive pressure sensor which is arranged at the second opening for measurement of the pressure in the liquid.
  • the capacitive pressure sensor may e.g. be made from ceramic or silicon.
  • the second opening in the sensor house may be flush with the first opening in the rotor can when in use so that the capacitive sensor measures the pressure in the fluid adjacent to the inner surface of the rotor can.
  • the at least one sensor may be a pressure sensor comprising at least one strain gauge, such as strain gauges forming a Wheatstone bridge.
  • strain gauges such as strain gauges forming a Wheatstone bridge.
  • the technology of using strain gauges for pressure measurements will be well known to a person skilled in the art of pressure sensors.
  • the output signal from the at least one sensor is an analogue signal that is converted to a digital signal by the electric circuit unit, the digital signal being transferred to the wireless communication device.
  • the scope of protection also covers the use of sensors that provide digital outputs.
  • the wireless communication device may further be configured to wirelessly receive power from a power supply arranged outside the sensor device, the power being for powering components of the sensor device including the at least one sensor.
  • the same component can be used for the transfer of both data and power so that no additional components or electrical connections are needed for the powering of the sensor device.
  • the wireless communication device is based on Radio Frequency identification (RFID) communication technology, such as on Near Field Communication (NFC) technology.
  • RFID components are grouped into different frequency bands ranging from Low Frequency (LF) of 125 kHz - 134 kHz to Microwave Frequency (MF) of 2.45 GHz and 5.4 GHz and with several groups in-between.
  • LF Low Frequency
  • MF Microwave Frequency
  • the wireless communication device may operate at a frequency of above 5 MHz, such as above 10 MHz, such as between 10 and 100 MHz, such as between 13 and 14 MHz. Such frequencies are significantly higher than other frequencies present in or near the pump, such as from the motor running the pump. Thus, by operating the wireless communication device at such higher frequencies, it is possible to avoid noise in the signals, such as Electro Magnetic Interference (EMI) noise generated from a Variable Frequency Controller of the pump motor. Such noise could otherwise result in errors or lack of precision in the measurements being performed.
  • the frequency of the wireless communication device may be 13.56 MHz which is referred to as High Frequency. This is the frequency typically used by an NFC component, and it is the type used during the development of the present invention.
  • the ISM radio bands are portions of the radio spectrum reserved internationally for industrial, scientific and medical purposes, excluding applications in telecommunications. If one of the alternative frequency bands of RFID components were chosen, when operating at 860MHz - 960MHz (Ultra High Frequency) it is necessary be robust towards GSM noise, and at 2,4Ghz and 5GHz (Microwave Frequency) there is a risk of experiencing noise from possible Wi-Fi Access points possibly present near the pump. These potential error sources can be avoided by choosing NFC technology operating at 13.56 MHz.
  • the calibration parameters are stored in the sensor device and are configured to be read at initialization during a first use of the sensor device. This is advantageous when a sensor device is mounted in an existing pump or when the sensor device is replaced by another one. In both cases, the first powering will automatically transfer the calibration parameters for that specific sensor to the power unit so that it is ready for use without the need for any further calibration or tests to be performed.
  • the sensor device is configured for communication directly with the sensor via a smart phone.
  • This may e.g. be possible via the use of an NFC component as the wireless communication device, such as by use of NFC technology operating at 13.56 MHz.
  • NFC technology operating at 13.56 MHz.
  • an easy access and communication is obtained which may be relevant e.g. during maintenance.
  • the present invention relates to a pump comprising:
  • a rotor can housing a rotor of the motor
  • the at least one control unit comprising the receiver for receiving the wireless signal communicated from the wireless communication device.
  • the at least one control unit may be provided in a control box which is releasably mounted on the pump, and wherein removal of the control box provides direct access to the sensor device.
  • Figure 1 schematically shows an exploded view of an example of a prior art pump.
  • Figure 2 schematically shows an example of how a sensor device according to the present invention can be arranged in relation to a rotor can of a pump.
  • Figure 3 schematically shows a cross-sectional view through a pump with a sensor device according to the present invention.
  • Figure 4 schematically shows an embodiment of a sensor device according to the present invention, the sensor device comprising a sensor house with a sensor cup.
  • Figure 5 schematically shows the sensor device of figure 4 arranged in a pump.
  • Figure 6 schematically shows an example of the communication between the sensor and an external receiver.
  • Figure 7 schematically shows another embodiment of a sensor device comprising a capacitive pressure sensor.
  • FIG. 1 schematically shows an exploded view of an example of a prior art pump 1.
  • the different components of which it is composed will be well known to a person skilled in the art.
  • the figure shows the location of the stator 2 of the motor driving the pump and the rotor can 3 housing the rotor 4 of the motor.
  • a printed circuit board 5 which may, in a similar pump according to the present invention, comprise the receiver for receiving signals from a sensor device of the present invention as will be described in the following.
  • This printed circuit board is arranged in a control box 6 which is releasably mounted on the pump. Removal of the control box 6 will provide direct access to the upper part of the rotor can 3.
  • Figure 2 schematically shows an example of how a sensor device 7 according to the present invention can be arranged in relation to a rotor can 3 of a pump, so that it can be used for measuring at least one property of a liquid present in the pump.
  • the sensor device 7 may be configured to measure one or more of the following properties: pressure, temperature, sound, or concentration of a substance contained in the liquid.
  • the scope of protection also covers sensor devices comprising more than one sensor; e.g. a pressure sensor and a temperature sensor.
  • the sensor is a pressure sensor, it may be of the type comprising at least one strain gauge, such as strain gauges forming a Wheatstone bridge. The functioning of such a type of sensor will be well known for a skilled person working within the field of pressure sensors.
  • the illustrated sensor device 7 comprises a sensor 8, a wireless communication device 9 configured to communicate a wireless signal, and an electric circuit unit 10 having the at least one sensor 8 electrically connected thereto at a first end and the wireless communication device electrically connected thereto at a second end.
  • the output signal from the sensor 8 is typically an analogue signal that is converted to a digital signal by the electric circuit unit 10, and the digital signal is then transferred to the wireless communication device 9.
  • the electric circuit unit 10 is mounted in liquid-tight engagement with a first opening Il in a rotor can 3 of the pump so that it is ensured that liquid does not flow via the first opening 11 and into other parts of the pump, such as into the control unit, or leak out of the pump 1.
  • An output signal from the sensor 8 is transferred to the wireless communication device 9 via the electric circuit unit 10, and the wireless communication device 9 communicates the wireless signal representative of the output signal to a receiver 12 at a distance therefrom.
  • the wireless signal communicated by the wireless communication device 9 is typically a radio signal.
  • Figure 3 schematically shows a cross-sectional view through a pump 1 with a sensor device 7 according to the present invention.
  • the sensor device 7 will be described in more details in the following.
  • the space where the sensor device 7 is arranged is quite limited.
  • the first opening in the rotor can 3 may be an opening originally provided for the arrangement of a deblocking screw with which it is possible to release the rotor in case it has got stuck in a given position e.g. after a period of no operation.
  • Many pumps are designed to be provided with such a deblocking screw and by designing the sensor device for arrangement in the same opening, it is easy to provide a pump with a sensor device according to the present invention by using the same space as was originally prepared for a deblocking screw which may not be needed for that pump.
  • Figure 4 schematically shows an embodiment of the invention comprising a sensor house housing 13 the at least one sensor 8, the electric circuit unit 10, and the wireless communication device 9.
  • the sensor house 13 is illustrated as mounted in engagement with the first opening Il in a rotor can 3 of the pump as described in relation to the previous figures.
  • the sensor house 13 comprises an enclosure 14 in which the electric circuit unit 10 and the wireless communication device 9 are arranged.
  • the sensor house 13 in figure 4 comprises a sensor cup 15 with an inner chamber 16 surrounded by a sensor cup wall 17, and the inner chamber 16 is in liquid communication with the sensor 8 via a second opening 18.
  • the sensor cup 15 is dimensioned and shaped for extending in a liquid-tight manner through the first opening 11 in the rotor can 3 and into the liquid 19 in the rotor can 3 during use as shown in the figures.
  • the sensor cup 15 is provided with a third opening 20 through which the liquid 19 can flow into the inner chamber 16 during use of the sensor device 7.
  • the sensor 8 will be in more direct contact with the liquid which may provide a more precise measurement of a value being representative of an average value for all the liquid flowing through the pump or being present in the pump when there is no flow.
  • the sensor house 13 is arranged without doing so.
  • Figure 5 schematically shows the sensor device 7 of figure 4 arranged in a control box 6 of a pump.
  • the figure also shows the pump having a main printed circuit board 5, PCB, used for the control of the pump.
  • PCB 5 is where the receiver for receiving the wireless signal from sensor device 7 is typically placed.
  • FIG. 6 schematically shows an example of the communication between the sensor 8 and an external receiver 12.
  • An output signal from the sensor 8 is sent to the wireless communication device 9 via the electric circuit unit 10, which in the illustrated embodiment is an NFC or other RFID component. It communicates with an NFC/RFID reader 12 typically mounted on the primary PCB 5 of the pump. This NFC/RFID reader 12 then transfers the received data to a control unit 21 of the pump.
  • the NFC/RFID component 9 may also be provided with energy for the powering of the sensor device 7.
  • the powering is typically done via an electromagnetic field as shown schematically in the figure.
  • light such as an infrared LED, for the transmission of data and or power.
  • Figure 7 schematically shows a partial view of another embodiment of a sensor device according to the invention.
  • the sensor house 13 has the second opening 18 which is flush with the first opening 11 in the rotor can 3 when in use, and the at least one sensor 8 is in the form of a capacitive pressure sensor which is arranged at the second opening 18 for measurement of the pressure in the liquid.
  • the figure only includes the region around the sensor 8, but the not included parts, such as the electric unit, may e.g. look like in previous figures.
  • the pressure signal measured by the capacitive pressure sensor 8 is then transferred to the wireless communication device 9 via an electric unit 10 in the same manner as described for the previous embodiments.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Arrangements For Transmission Of Measured Signals (AREA)
  • Measuring Fluid Pressure (AREA)

Abstract

L'invention concerne un dispositif de détection (7) pour mesurer au moins une propriété d'un liquide dans une pompe (1). Le dispositif de détection comprend au moins un capteur (8), un dispositif de communication sans fil (9) configuré pour communiquer un signal sans fil, et une unité de circuit électrique (10) ayant le ou les capteurs électriquement connectés à celui-ci au niveau d'une première extrémité et le dispositif de communication sans fil connecté électriquement à celui-ci à une seconde extrémité. L'unité de circuit électrique est montée en prise étanche aux liquides avec une première ouverture (11) dans une boîte de rotor (3) de la pompe (1). Le dispositif de détection est configuré de telle sorte que, pendant l'utilisation, le ou les capteurs mesurent la ou les propriétés du liquide. Un signal de sortie provenant du ou des capteurs est transféré au dispositif de communication sans fil par l'intermédiaire de l'unité de circuit électrique, et le dispositif de communication sans fil communique le signal sans fil représentatif du signal de sortie à un récepteur (12) à une certaine distance de celle-ci. L'invention concerne en outre une pompe (1) comprenant un tel dispositif de détection.
PCT/EP2022/086918 2021-12-23 2022-12-20 Dispositif de détection et pompe ou système de pompe doté d'un tel dispositif de détection WO2023118089A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DKPA202170669 2021-12-23
DKPA202170669 2021-12-23

Publications (1)

Publication Number Publication Date
WO2023118089A1 true WO2023118089A1 (fr) 2023-06-29

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PCT/EP2022/086918 WO2023118089A1 (fr) 2021-12-23 2022-12-20 Dispositif de détection et pompe ou système de pompe doté d'un tel dispositif de détection

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20100166570A1 (en) * 2008-12-29 2010-07-01 Little Giant Pump Company Method and apparatus for detecting the fluid condition in a pump
KR200454775Y1 (ko) * 2011-01-20 2011-07-28 김해웅 수중 모터 펌프의 작동 상태를 감시하는 모니터링 유니트
KR102104789B1 (ko) * 2019-10-04 2020-04-27 신신이앤지(주) 수중펌프의 지능형 최적 안전 운전시스템 및 이의 제어방법

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20100166570A1 (en) * 2008-12-29 2010-07-01 Little Giant Pump Company Method and apparatus for detecting the fluid condition in a pump
KR200454775Y1 (ko) * 2011-01-20 2011-07-28 김해웅 수중 모터 펌프의 작동 상태를 감시하는 모니터링 유니트
KR102104789B1 (ko) * 2019-10-04 2020-04-27 신신이앤지(주) 수중펌프의 지능형 최적 안전 운전시스템 및 이의 제어방법

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