CN107829954A - A kind of dry running protection apparatus and method of motor-operated well pump - Google Patents
A kind of dry running protection apparatus and method of motor-operated well pump Download PDFInfo
- Publication number
- CN107829954A CN107829954A CN201710904791.4A CN201710904791A CN107829954A CN 107829954 A CN107829954 A CN 107829954A CN 201710904791 A CN201710904791 A CN 201710904791A CN 107829954 A CN107829954 A CN 107829954A
- Authority
- CN
- China
- Prior art keywords
- motor
- well pump
- power
- operated well
- dry running
- Prior art date
- Legal status (The legal status 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 status listed.)
- Granted
Links
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
- F04D15/0245—Stopping of pumps, or operating valves, on occurrence of unwanted conditions responsive to a condition of the pump
Landscapes
- 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
The invention discloses a kind of dry running protection apparatus and method of motor-operated well pump, belong to liquid goods control technology field.This method includes：Obtain the instantaneous power P1 of motor when motor-operated well pump is immersed in stable first in liquid medium；Calculate dry running protection power P of the motor-operated well pump in liquid medium, P=kn*P1；The real time execution power P 2 of motor when obtaining motor-operated well pump pump liquid-state medium；When the real time execution power P 2 of motor is less than dry running protection power P, judge that motor-operated well pump is in dry running status.The present invention can be according to the unloading constant k under different liquid goods medianSet the dry running protection power P of motor-operated well pump; professional and technical personnel is sent to reset dry running protection electric current preset value without deep well pump producer when changing liquid goods medium and unloading again; reduce the after-sale service of deep well pump producer, the expense of maintenance, save the time of the improper operation of ship.
Description
Technical field
The present invention relates to liquid goods control technology field, the dry running protection device of more particularly to a kind of motor-operated well pump and side
Method.
Background technology
LPG (Liquefied Petroleum Gas, liquefied petroleum gas) ship prevailing traffics using propane and butane as mainly into
The petroleum hydrocarbon divided or both gaseous mixture etc., LPG motor-operated well pumps are the cores for being used to carry out LPG handling on LPG ships
Part.
At work, original state is in liquid goods media environment motor-operated well pump, with the progress of cargo handling process, LPG
Liquid goods medium can gradually decrease in ship, so as to make motor-operated well pump be in outside liquid goods media environment, work as motor-operated well pump
Interior when not having liquid goods medium, motor-operated well pump is at dry running status.Now the impeller of motor-operated well pump is easily damaged.
It is the size by detecting the operating current of motor in real time to have a kind of dry running protection method at present, when detecting electricity
After the numerical value of the real-time working electric current of machine drops under electric current preset value, it is judged as motor-operated well pump and is in dry running status,
Motor-operated well pump is controlled to shut down.
During the present invention is realized, inventor has found that prior art at least has problems with：
Even same motor-operated well pump, because the density of liquid goods medium is different, motor-operated well pump is in dry operation shape
When under state, motor working current also can be different.Therefore when replacing liquid goods medium is unloaded again, it is required for deep well pump producer to send
Send professional and technical personnel and reset dry running protection electric current preset value, the process both added the after-sale service of deep well pump producer,
The expense of maintenance, waste again, delayed the ship normal operation time.
The content of the invention
In order to solve problem of the prior art, the embodiments of the invention provide a kind of dry running protection device of motor-operated well pump
And method.The technical scheme is as follows：
On the one hand, the invention provides a kind of dry running protection method of motor-operated well pump, methods described to include：
Obtain the instantaneous power P1 of motor when motor-operated well pump is immersed in stable first in liquid medium；
Calculate dry running protection power P of the motor-operated well pump in the liquid medium, P=kn* P1, wherein, knFor
Unloading constant, knSpan be 0.6~1.0；
Obtain the real time execution power P 2 of the motor when motor-operated well pump pumps the liquid medium；
When the real time execution power P 2 of the motor is less than the dry running protection power P, the electronic deep-well is judged
Pump is in dry running status.
Further, methods described also includes：
When the real time execution power P 2 of the motor is less than the dry running protection power P, the motor stopping is controlled.
Further, the real time execution work(for obtaining the motor when motor-operated well pump pumps the liquid medium
Rate P2, including：
Obtain the real-time current I and real-time voltage U of the motor；
The real time execution power P 2 of the motor, the motor are calculated according to the real-time current I and real-time voltage U
Real time execution power P 2 meet equation
Further, methods described also includes：
When judging that the motor-operated well pump is in dry running status, alarm is sent.
On the other hand, the invention provides a kind of dry running protection device of motor-operated well pump, described device to include：
Power detection module, for obtaining the wink of motor when motor-operated well pump is immersed in stable first in liquid medium
When power P 1 and obtain the real time execution power P 2 of the motor when motor-operated well pump pumps the liquid medium；
Parameter setting module, for calculating dry running protection power P of the motor-operated well pump in the liquid medium,
P=kn* P1, wherein, knFor constant of unloading, knSpan be 0.6~1.0；
Processing module, real time execution power P 2 and the dry running protection power P for the motor, when described
When the real time execution power P 2 of motor is less than the dry running protection power P, judge that the motor-operated well pump is in dry operation shape
State.
Further, described device also includes control module, is less than institute for the real time execution power P 2 when the motor
When stating dry running protection power P, the motor stopping is controlled.
Further, the power detection module includes electric current acquiring unit, voltage acquisition unit, computing unit, described
Electric current acquiring unit is used for the real-time current I for obtaining the motor, and the voltage acquisition unit is used for the reality for obtaining the motor
When voltage U, the computing unit is used for the real-time fortune that the motor is calculated according to the real-time current I and the real-time voltage U
Row power P 2, the real time execution power P 2 of the motor meet equation
Further, described device also includes alarm module, and the alarm module is used for,
When judging that the motor-operated well pump is in dry running status, alarm is sent.
Further, the alarm module includes at least one of buzzer, flash lamp, loudspeaker.
Further, described device also includes memory module, and the memory module is immersed in for storing motor-operated well pump
Unloading constant k when being run in different liquid mediumsnAnd the motor-operated well pump is immersed in head in different liquid mediums
The instantaneous power P1 of motor when secondary stable.
The beneficial effect that technical scheme provided in an embodiment of the present invention is brought is：
By setting the dry running protection power P of motor-operated well pump, and the real time execution power P 2 of motor is detected, work as motor
Real time execution power P 2 when being less than dry running protection power P, then judge that motor-operated well pump is in dry running status, and control electricity
Machine is shut down so that motor will not continue to operation driving impeller rotation in the state of underloading or zero load, avoid impeller failure, simultaneously
The dry running protection power P of motor-operated well pump can be set according to different liquid goods media, be ensured in the different liquid of density
Under goods medium, dry running protection can be carried out to motor-operated well pump, when replacing liquid goods medium is unloaded again, without deep well pump factory
Family sends professional and technical personnel to reset dry running protection electric current preset value, reduces the after-sale service of deep well pump producer, maintenance
Expense, save time of ship normal operation.
Brief description of the drawings
Technical scheme in order to illustrate the embodiments of the present invention more clearly, make required in being described below to embodiment
Accompanying drawing is briefly described, it should be apparent that, drawings in the following description are only some embodiments of the present invention, for
For those of ordinary skill in the art, on the premise of not paying creative work, other can also be obtained according to these accompanying drawings
Accompanying drawing.
Fig. 1 is a kind of method flow diagram of the dry running protection method of motor-operated well pump provided in an embodiment of the present invention；
Fig. 2 is a kind of structural representation of the dry running protection device of motor-operated well pump provided by the invention.
Embodiment
To make the object, technical solutions and advantages of the present invention clearer, below in conjunction with accompanying drawing to embodiment party of the present invention
Formula is described in further detail.
Fig. 1 is a kind of method flow diagram of the dry running protection method of motor-operated well pump provided in an embodiment of the present invention, such as Fig. 1
Shown, this method includes：
Step 101, the instantaneous power P1 for obtaining motor when motor-operated well pump is immersed in stable first in liquid medium.
Specifically, electronic depth can be determined according to the delay time t of start-up study relay in the starter that motor matches
Well pump is from starting to start to required time T1, the T1=t of stable operation, then detects motor-operated well pump and be immersed in liquid medium,
From starting to start, to after the T1 times, the instantaneous power P1 of motor.In specific implementation, it is determining for T1 that can set the time
When device, for automatic detection motor-operated well pump to after T1 the time required to stable operation since startup, the instantaneous power P1's of motor is big
It is small.
Further, the instantaneous power P1 of motor detection method is as follows；
The first step, motor-operated well pump is detected since startup to electricity during stable operation required time T1 by current transformer
The transient current I of machine1Size；
Second step, since detection motor-operated well pump starting to the instantaneous voltage U of motor during stable operation required time T11
Size；
3rd step, according to formulaI1*U1, calculate the instantaneous power P1 of motor size.
Step 102, calculate dry running protection power P of the motor-operated well pump in liquid medium, P=kn* P1, wherein, knFor
Unloading constant, knSpan be 0.6~1.0, knFor different liquid goods media density relative to the density of water ratio.
Specifically, under different liquid goods media, knValue it is as follows：
When liquid goods medium is liquefied ammonia, unload constant KnFor 0.61；
When liquid goods medium is liquefied petroleum gas, unload constant KnFor 0.65；
When liquid goods medium is Liquid vinyl chloride, unload constant KnFor 0.97；
When liquid goods medium is clear water, unload constant knFor 1.
The real time execution power P 2 of motor when step 103, acquisition motor-operated well pump pump liquid-state medium.
Specifically, step 103 can include：
The first step, obtain the real-time current I of motor；
Second step, obtain the real-time voltage U of motor；
3rd step, the real time execution power P 2 of motor, the real-time fortune of motor are calculated according to real-time current I and real-time voltage U
Row power P 2 meets equation
Step 104, the real time execution power P 2 for comparing motor and dry running protection power P.
Specifically, when the real time execution power P 2 of motor is less than dry running protection power P, judge that motor-operated well pump is in
Dry running status.
The embodiment of the present invention detects the real time execution of motor by setting the dry running protection power P of motor-operated well pump
Power P 2, when the real time execution power P 2 of motor is less than dry running protection power P, then judge that motor-operated well pump is in dry operation
State, and controlled motor is shut down so that motor will not may proceed to operation driving impeller rotation in the state of underloading or zero load, keep away
Exempt from impeller failure, while the dry running protection power P of motor-operated well pump can be set according to different liquid goods media, be ensured
Under the different liquid goods medium of density, dry running protection can be carried out to motor-operated well pump, be unloaded again when changing liquid goods medium
When, send professional and technical personnel to reset dry running protection electric current preset value without deep well pump producer, reduce deep well pump factory
Family's after-sale service, the expense of maintenance, save the time of ship normal operation.
Preferably, after step 104, the guard method can also include following optional step：
When the real time execution power P 2 of motor is less than dry running protection power P, controlled motor is shut down.
When judging that motor-operated well pump is in dry running status, alarm is sent.
, can be by setting at least one of buzzer, flash lamp, loudspeaker to be alarmed in specific implementation.
It should be noted that after motor-operated well pump causes motor stopping due to dry running protection output stopping signal, by
Staff operates other equipment and carries out sweeping operation on ship, treats in cargo tank that all pumping finishes and presses starter liquid goods medium
On SR, wait next cargo tank to be worked on after filling liquid goods medium again with controlled motor.
Fig. 2 is a kind of structural representation of the dry running protection device of motor-operated well pump provided by the invention, as shown in Fig. 2
The device includes power detection module 210, parameter setting module 220, processing module 230, control module 240, alarm module
250th, memory module 260 and touch-control display panel 270.
Power detection module 210 is used to obtain motor when motor-operated well pump is immersed in stable first in liquid medium
Instantaneous power P1 and obtain motor-operated well pump pump liquid-state medium when motor real time execution power P 2.
Further, power detection module 210 includes electric current acquiring unit 211, voltage acquisition unit 212, computing unit
213.Wherein, electric current acquiring unit 211 is used for the real-time current I for obtaining motor, and voltage acquisition unit 212 is used to obtain motor
Real-time voltage U, computing unit 213 are used for the real time execution power P 2 that motor is calculated according to real-time current I and real-time voltage U, electricity
The real time execution power P 2 of machine meets equation
Specifically, the instantaneous power P1 of motor can also be according to electric current acquiring unit 211, voltage acquisition unit 212, calculating
Unit 213 obtains.First according to the delay time t of start-up study relay in the starter of motor matching, electronic deep-well is determined
Then pump detects electronic deep-well from the required time T1, the T1=t that start to start to stable operation using electric current acquiring unit 211
Pump since startup to after T1 the time required to stable operation, the transient current I of motor1, electricity is detected using voltage acquisition unit 212
Dynamic deep well pump since startup to after T1 the time required to stable operation, the instantaneous voltage U of motor1, finally, using computing unit
213 calculate power P 1, and wherein power P 1 meets formulaI1*U1。
Parameter setting module 220 is used to calculate dry running protection power P of the motor-operated well pump in liquid medium, P=kn*
P1, wherein, knFor constant of unloading, knSpan be 0.6~1.0；
Preferably, the device can also include memory module 260, and memory module 260 can be used for storing motor-operated well pump
It is immersed in unloading constant k when being run in different liquid mediumsn, and motor-operated well pump is immersed in different liquid mediums
The instantaneous power P1 of motor when stable first.Specifically, motor-operated well pump can be obtained by pre-trial to be immersed in not
The instantaneous power P1 of motor when stable first in same liquid medium, reduce instantaneous power P1 detection number.
Parameter setting module 220 can read the motor-operated well pump stored in memory module 260 and be immersed in different liquid
Unloading constant k when being run in mediumnAnd motor-operated well pump is immersed in liquid medium and transported first in power detection module 210
The instantaneous power P1 of motor when row is stable, and when can select to run in current liquid medium by parameter setting module 220
Unload constant knSize value, dry running protection power P of the motor-operated well pump in current liquid medium is calculated, wherein dry
Running protection power P meets P=kn*P1。
Alternatively, the device can also include touch-control display panel 270, by being chosen not on touch-control display panel 270
Same liquid goods medium, you can unloading constant k when obtaining running in current liquid mediumnSize, calculate dry running protection
Power P, while also can obtain the instantaneous power of motor when motor-operated well pump is immersed in stable first in current liquid medium
P1.The touch-control display panel 270 can be also used for touch-control and show dry running protection power P and the real time execution power P 2 of motor
Size.
Processing module 230 is used to compare the real time execution power P 2 of motor and dry running protection power P, real-time when motor
When operation power P 2 is less than dry running protection power P, judge that motor-operated well pump is in dry running status.
Specifically, the processing module 230 can be connected with touch-control display panel 270, when processing module 230 judges electronic depth
When well pump is in dry running status, result can be included on touch-control display panel 270.
Further, the device also includes control module 240, for being less than dry operation when the real time execution power P 2 of motor
When protecting power P, controlled motor is shut down.
Specifically, control module 240 electrically connects with processing module 230, when processing module 230 judges that motor-operated well pump is in
During dry running status, then the controlled motor of control module 240 is shut down.One stop botton can also be set, and operating personnel can lead to
Cross and press stop botton controlled motor shutdown.
Further, the device can also include alarm module 250, and alarm module 250, which is used to work as, judges motor-operated well pump
During in dry running status, alarm is sent.
The alarm module 250 is connected with processing module 230, when processing module 230 judges that motor-operated well pump is in dry
During running status, then warning device is alarmed.
Alternatively, alarm module 250 can include at least one of buzzer, flash lamp, loudspeaker.
The embodiment of the present invention detects the real time execution of motor by setting the dry running protection power P of motor-operated well pump
Power P 2, when the real time execution power P 2 of motor is less than dry running protection power P, then judge that motor-operated well pump is in dry operation
State, and controlled motor is shut down so that motor will not may proceed to operation driving impeller rotation in the state of underloading or zero load, keep away
Exempt from impeller failure, while the dry running protection power P of motor-operated well pump can be set according to different liquid goods media, be ensured
Under the different liquid goods medium of density, dry running protection can be carried out to motor-operated well pump, be unloaded again when changing liquid goods medium
When, send professional and technical personnel to reset dry running protection electric current preset value without deep well pump producer, reduce deep well pump factory
Family's after-sale service, the expense of maintenance, save the time of ship normal operation.
The foregoing is only presently preferred embodiments of the present invention, be not intended to limit the invention, it is all the present invention spirit and
Within principle, any modification, equivalent substitution and improvements made etc., it should be included in the scope of the protection.
Claims (10)
- A kind of 1. dry running protection method of motor-operated well pump, it is characterised in that methods described includes：Obtain the instantaneous power P1 of motor when motor-operated well pump is immersed in stable first in liquid medium；Calculate dry running protection power P of the motor-operated well pump in the liquid medium, P=kn* P1, wherein knFor unloading Constant, knSpan be 0.6~1.0；Obtain the real time execution power P 2 of the motor when motor-operated well pump pumps the liquid medium；When the real time execution power P 2 of the motor is less than the dry running protection power P, judge at the motor-operated well pump In dry running status.
- 2. according to the method for claim 1, it is characterised in that methods described also includes：When the real time execution power P 2 of the motor is less than the dry running protection power P, the motor stopping is controlled.
- 3. according to the method for claim 1, it is characterised in that the motor-operated well pump pumping liquid that obtains is situated between The real time execution power P 2 of motor during matter, including：Obtain the real-time current I and real-time voltage U of the motor；The real time execution power P 2 of the motor, the reality of the motor are calculated according to the real-time current I and real-time voltage U Shi Yunhang power Ps 2 meet equation
- 4. according to the method for claim 1, it is characterised in that methods described also includes：When judging that the motor-operated well pump is in dry running status, alarm is sent.
- 5. a kind of dry running protection device of motor-operated well pump, it is characterised in that described device includes：Power detection module, for obtaining the moment work(of motor when motor-operated well pump is immersed in stable first in liquid medium Rate P1 and the real time execution power P 2 for obtaining the motor when motor-operated well pump pumps the liquid medium；Parameter setting module, for calculating dry running protection power P of the motor-operated well pump in the liquid medium, P= kn* P1, wherein, knFor constant of unloading, knSpan be 0.6~1.0；Processing module, real time execution power P 2 and the dry running protection power P for the motor, when the motor Real time execution power P 2 when being less than the dry running protection power P, judge that the motor-operated well pump is in dry running status.
- 6. device according to claim 5, it is characterised in that described device also includes control module, for when the electricity When the real time execution power P 2 of machine is less than the dry running protection power P, the motor stopping is controlled.
- 7. device according to claim 5, it is characterised in that the power detection module includes electric current acquiring unit, electricity Acquiring unit, computing unit are pressed, the electric current acquiring unit is used for the real-time current I for obtaining the motor, and the voltage obtains Unit is used for the real-time voltage U for obtaining the motor, and the computing unit is used for according to the real-time current I and the electricity in real time U is pressed to calculate the real time execution power P 2 of the motor, the real time execution power P 2 of the motor meets equation
- 8. device according to claim 5, it is characterised in that described device also includes alarm module, the alarm module For when judging that the motor-operated well pump is in dry running status, sending alarm.
- 9. device according to claim 8, it is characterised in that the alarm module includes buzzer, flash lamp, loudspeaker At least one of.
- 10. according to the device described in any one of claim 5~9, it is characterised in that described device also includes memory module, institute State memory module be used to storing the motor-operated well pump be immersed in unloading constant kn when running in different liquid mediums and The instantaneous power P1 of motor-operated well pump motor when being immersed in stable first in different liquid mediums.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710904791.4A CN107829954B (en) | 2017-09-29 | 2017-09-29 | A kind of dry running protection device and method of motor-operated well pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710904791.4A CN107829954B (en) | 2017-09-29 | 2017-09-29 | A kind of dry running protection device and method of motor-operated well pump |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107829954A true CN107829954A (en) | 2018-03-23 |
| CN107829954B CN107829954B (en) | 2019-10-22 |
Family
ID=61647485
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710904791.4A Active CN107829954B (en) | 2017-09-29 | 2017-09-29 | A kind of dry running protection device and method of motor-operated well pump |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107829954B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108730169A (en) * | 2018-05-21 | 2018-11-02 | 内蒙古蒙草生态环境（集团）股份有限公司 | Pump switch control method and pump switch control device |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102116284A (en) * | 2011-03-05 | 2011-07-06 | 介国安 | No-setting pump no-liquid idling preventing protector |
| KR20120032259A (en) * | 2010-09-28 | 2012-04-05 | (주)인텍에프에이 | Water pumping system using new renewable energy and method for controlling thereof |
| CN103089659A (en) * | 2011-10-31 | 2013-05-08 | 朱小雄 | Water pump with water shortage protection device |
| CN203906322U (en) * | 2014-06-21 | 2014-10-29 | 武钢集团昆明钢铁股份有限公司 | Deep-well pump control device beneficial for preventing no-load pumping |
| CN106257053A (en) * | 2016-05-12 | 2016-12-28 | 苏州能讯高能半导体有限公司 | The detection method of a kind of water pump operation state, Apparatus and system |
-
2017
- 2017-09-29 CN CN201710904791.4A patent/CN107829954B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20120032259A (en) * | 2010-09-28 | 2012-04-05 | (주)인텍에프에이 | Water pumping system using new renewable energy and method for controlling thereof |
| CN102116284A (en) * | 2011-03-05 | 2011-07-06 | 介国安 | No-setting pump no-liquid idling preventing protector |
| CN103089659A (en) * | 2011-10-31 | 2013-05-08 | 朱小雄 | Water pump with water shortage protection device |
| CN203906322U (en) * | 2014-06-21 | 2014-10-29 | 武钢集团昆明钢铁股份有限公司 | Deep-well pump control device beneficial for preventing no-load pumping |
| CN106257053A (en) * | 2016-05-12 | 2016-12-28 | 苏州能讯高能半导体有限公司 | The detection method of a kind of water pump operation state, Apparatus and system |
Non-Patent Citations (1)
| Title |
|---|
| 钟盛等: "电泵井欠载整定值探讨", 《大庆石油地质与开发》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108730169A (en) * | 2018-05-21 | 2018-11-02 | 内蒙古蒙草生态环境（集团）股份有限公司 | Pump switch control method and pump switch control device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107829954B (en) | 2019-10-22 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP2009120204A (en) | Storing system for low flash point fuel | |
| US20220178355A1 (en) | Intake-adaptable gas generator | |
| US10626513B1 (en) | Water electrolysis hydrogen production plant with a pumpless water supply system and process flow method | |
| JP2007121210A (en) | Fuel gas consumption system, and gas leakage detection method thereof | |
| CN107829954A (en) | A kind of dry running protection apparatus and method of motor-operated well pump | |
| US20170122089A1 (en) | Control system for a co2 fracking system and related system and method | |
| CN106711933B (en) | A kind of equipment abnormal electrical power supply processing method, device and video camera | |
| CN105736936A (en) | Unloading and storing method for liquefied natural gas | |
| KR20130014096A (en) | No-load operation prevention apparatus of pump | |
| CN207331814U (en) | Feed water control system and water supply system | |
| US20150086385A1 (en) | Method for controlling pumping of pump units in a wet well | |
| CN202382452U (en) | Electronic automatic water leak alarm device of solar water tank | |
| US20230167809A1 (en) | Intake-adaptable gas generator | |
| CN207418866U (en) | A kind of micro-corrosion liquid automatic adding device | |
| JP3707495B2 (en) | Coil wound inspection apparatus and method | |
| CN106382245B (en) | compressor surge control method and system | |
| CN207331846U (en) | Feed water control system and water supply system | |
| CN207114526U (en) | Fruit basket anti-corrosion detector | |
| CN204433473U (en) | A kind of stock tank input and output material control system | |
| JP2019073975A (en) | Fuel supply system and fuel supply method | |
| JP3707496B2 (en) | Coil wound inspection apparatus and method | |
| JP2019073977A (en) | Compressed air supply system, control system for compressed air supply system and control method for compressed air supply system | |
| CN206255833U (en) | Hazardous material (fluids) non-exhaust emission unloading unit | |
| US20240288162A1 (en) | Automated flare control | |
| KR20160037678A (en) | Water piston device and biogas compression system using the water piston device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |