CN107203224B - A kind of level sensing and control device and method - Google Patents
A kind of level sensing and control device and method Download PDFInfo
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- CN107203224B CN107203224B CN201710353181.XA CN201710353181A CN107203224B CN 107203224 B CN107203224 B CN 107203224B CN 201710353181 A CN201710353181 A CN 201710353181A CN 107203224 B CN107203224 B CN 107203224B
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D9/00—Level control, e.g. controlling quantity of material stored in vessel
- G05D9/12—Level control, e.g. controlling quantity of material stored in vessel characterised by the use of electric means
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Abstract
The present invention provides that a kind of level sensing such as is used to solve the problem of water wave fluctuation with control device and method and contact shake at some common bad conditions in practice and the normal work that can seriously affect liquid-level switch is shaken in water wave fluctuation and contact.Including switch, water inlet pressure sensor, wave amplitude and frequency sensor and pulsewidth mode setting unit and level control unit；The switch connects level control unit with pulsewidth mode setting unit, and the wave amplitude and frequency sensor connect pulsewidth mode setting unit with inlet water sensor；The level control unit eliminates the fluctuation of the signal of switch according to pulse width signal for receiving the first signal and pulse width signal of switch input, obtains second signal；For controlling water inlet or water outlet according to second signal.It is eliminated by pulse width signal because the electric signal of switch fluctuates caused by liquid fluctuating, to accurately identify the state of liquid level, eliminate liquid fluctuating influences caused by Liquid level.
Description
Technical field
The present invention relates to the communication technology/computer technologies, and in particular to a kind of level sensing and control device and method.
Background technique
Industrialized agriculture revolution in mode of production is the important component of China's agricultural modernization innovation and development, China in Recent Years
Facilities horticulture achieves faster development.Vegetables production is the pith in facilities horticulture, and water-fertilizer integral is current facility
The key technology of vegetables production.The extensive liquid manure method of application traditional relative to China, water-fertilizer integral are using technology
By irrigation system fertilizing, watering, crop absorbs nutrient while absorbing moisture.Because it is efficiently utilized, the fertile water-saving of province, is saved
It is cost, easy to use, it is widely applied in agricultural production by developed countries such as America and Europes.The intelligent liquid level switch is liquid manure intelligence
One of control unit on energy regulator control system is the Curve guide impeller to traditional liquid level control float in complex fertilizer tank and time liquid bucket.
Water-fertilizer integrated intelligent liquid level adjusting device need to be monitored liquid level avoid liquid level overflow or liquid level it is too low
Cause water pump to dally.There are many deficiencies to Liquid level in water-fertilizer integral equipment at present.Current liquid level monitors automatically
Method mainly controls the start and stop of water pump by judging the on-off of liquid level float.But by practicing for a long time, on a large scale
Later, it is some common in practice to will lead to water wave fluctuation and contact shake etc. when adding water into complex fertilizer tank and time liquid bucket for discovery
Bad condition, and the fluctuation of above-mentioned water wave and contact shake can seriously affect the normal work of liquid-level switch, and liquid level is caused to overflow
Or liquid level it is too low cause water pump to dally.
In conclusion at this stage still there are many drawbacks in the intelligent liquid level control of China's water-fertilizer integral equipment, therefore
Need to presently, there are the shortcomings that improve, realize intelligent Liquid level.
Summary of the invention
In view of the above problems, the invention proposes overcome the above problem or at least be partially solved one kind of the above problem
Level sensing and control device and method.
For this purpose, in a first aspect, the present invention proposes a kind of level sensing and control device, device include: switch,
Water inlet pressure sensor, wave amplitude and frequency sensor and pulsewidth mode setting unit and level control unit；
The switch connects level control unit with pulsewidth mode setting unit, the wave amplitude and frequency sensor and
Inlet water sensor connects pulsewidth mode setting unit；
The water inlet pressure sensor exports the hydraulic signal of water inlet pipe for measuring the hydraulic pressure of water inlet pipe；
The wave amplitude and frequency sensor export amplitude signal and frequency letter for measuring liquid fluctuating amplitude and frequency
Number；
The pulsewidth mode setting unit, for receive the amplitude signal of wave amplitude and frequency sensor, frequency signal and into
The hydraulic signal of water pipe, for exporting corresponding arteries and veins according to the hydraulic signal of width signal, frequency signal and the water inlet pipe received
Bandwidth signals；
The level control unit is believed for receiving the first signal and pulse width signal of switch input according to pulsewidth
The fluctuation of the signal of number elimination switch obtains second signal；For controlling water inlet or water outlet according to second signal.
Optionally, described for being corresponded to according to the hydraulic signal output of width signal, frequency signal and the water inlet pipe received
Pulse width signal include, for according to the hydraulic signal and pulsewidth of pre-set amplitude signal, frequency signal and water inlet pipe believe
Number corresponding relationship, and according to the hydraulic pressure of amplitude signal, frequency signal and the water inlet pipe received believe, determine corresponding pulsewidth
Signal.
Optionally, the wave amplitude and frequency sensor and switch are located at the same horizontal position.
Optionally, the pulsewidth mode setting unit is for adjusting amplitude signal, frequency signal and water inlet pipe hydraulic signal
With the corresponding relationship of pulse width signal.
Optionally, the level control unit be used for according to pulse width signal eliminate switch signal fluctuation it
Before, it is also used to eliminate the burr of the first signal.
Optionally, the level control unit by way of Interruption for controlling water inlet equipment or water outlet equipment.
Second aspect, the present invention provide a kind of level sensing and control method, comprising:
S101, the amplitude signal for receiving wave amplitude and frequency sensor, frequency signal and water inlet pipe hydraulic signal, be used for root
Corresponding pulse width signal is exported according to the hydraulic signal of amplitude signal, frequency signal and the water inlet pipe received；
S102, the first signal and pulse width signal for receiving switch input eliminate switch according to pulse width signal
The fluctuation of signal obtains second signal；
S103, water inlet or water outlet are controlled according to second signal.
Optionally, comprising: receive the hydraulic signal pass corresponding with pulse width signal of amplitude signal, frequency signal and water inlet pipe
System exports corresponding pulse width signal according to the corresponding relationship received.
The third aspect, the present invention provide a kind of computer readable storage medium, are stored thereon with computer program, the program
The step of any of the above-described the method is realized when being executed by processor.
Fourth aspect, the present invention provides a kind of computer equipment, including processing circuit and memory, in the memory
Computer program that is upper and can executing on the processor, which is characterized in that the processing circuit executes real when described program
The step of existing any of the above-described the method.
As shown from the above technical solution, of the invention to obtain the amplitude of liquid fluctuating by increasing wave amplitude and frequency sensor
And frequency is obtained according to the corresponding relationship of the hydraulic signal of preset amplitude signal, frequency signal and water inlet pipe and pulse width signal
Pulse width signal is eliminated by pulse width signal because the electric signal of switch fluctuates caused by liquid fluctuating, thus accurately
Identify the state of liquid level, eliminate liquid fluctuating influences caused by Liquid level.Different container or using not in the prior art
The fluctuating range and frequency generated with the pump of power may be different, so as to cause same set of liquid level monitoring device in certain appearances
It is available in device, and effect is poor in other containers, or is not available completely, will also result in not using the pump of different capacity
With the interference signal of degree, and above-mentioned apparatus intervenes the fluctuation of the signal of switch by implementing induction liquid fluctuating,
To make the present apparatus can be applied to the pump of a variety of different containers and different capacity to meet more use demands.Front is to mention
For the simplified summary of the understanding to some aspects of the present invention.This part neither the present invention and its various embodiments it is detailed
Statement is also not exhaustive statement to the greatest extent.It neither important or key feature of the invention nor limits model of the invention for identification
It encloses, but provides selected principle of the invention with a kind of reduced form, as to the brief introduction given below more specifically described.
It should be appreciated that either alone or in combination using the one or more features for being set forth above or being detailed below, it is of the invention
Other embodiments are also possible.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is the present invention
Some embodiments for those of ordinary skill in the art without creative efforts, can also basis
These attached drawings obtain other attached drawings.
Fig. 1 is to implement the level sensing and control device schematic diagram in the prior art.
Fig. 2 is the schematic device that manual setting pulse width signal is used in one embodiment of the present of invention.
Description of symbols: switch 101, water inlet pressure sensor 102, inlet 105, wave amplitude and frequency sensor
103, pulsewidth mode setting unit 107, level control unit 109.
Specific embodiment
The present invention is described below in conjunction with exemplary embodiment.
The present invention proposes a kind of level sensing and control device, and referring to Fig. 1, device includes: switch 101, influent pressure
Sensor 102, wave amplitude and frequency sensor 103 and pulsewidth mode setting unit 107 and level control unit 109；
Switch 101 is provided in the container equipped with liquid, is used for sensed level, and the transmission when liquid level reaches default
Electric signal.Switch 101 can be side dress plastic float switch 101 or side-mounted PP plastics small floating ball switch or stainless
Steel side fills water level liquid level switch 101 etc..Inlet water sensor is set to water inlet, wave amplitude and frequency sensor for perceiving liquid
Surface wave dynamic amplitude and frequency, wave amplitude and frequency sensor 103 acquire the fluctuating range and frequency information of liquid level in real time.
The switch 101 connects level control unit, the wave amplitude and frequency sensing with pulsewidth mode setting unit
Device connects pulsewidth mode setting unit with inlet water sensor；
The water inlet pressure sensor 102 exports the hydraulic signal of water inlet pipe for measuring the hydraulic pressure of water inlet pipe；
The wave amplitude and frequency sensor 103 export amplitude signal and frequency for measuring liquid fluctuating amplitude and frequency
Signal；
The pulsewidth mode setting unit, for receive the amplitude signal of wave amplitude and frequency sensor, frequency signal and into
The hydraulic signal of water pipe, for exporting corresponding arteries and veins according to the hydraulic signal of width signal, frequency signal and the water inlet pipe received
Bandwidth signals；It collects and generates pulse width signal, pulsewidth letter according to preset pulsewidth mode after the hydraulic pressure of wave amplitude, frequency and water inlet pipe
Number for eliminates because liquid fluctuating caused by switch 101 electric signal fluctuate.Pulsewidth mode includes but is not limited to mould
Formula one, mode two and mode three.Mode one refer to user according to concrete application scene adjust amplitude signal, frequency signal and into
The hydraulic signal of water pipe and the corresponding relationship of pulse width signal.Mode two refers to the experimental data according to concrete scene, presets wave amplitude letter
Number, the corresponding relationship of the hydraulic signal of frequency signal and water inlet pipe and pulse width signal；Mode three refers to acquisition amplitude signal, frequency
The hydraulic signal of signal and water inlet pipe and training, to obtain the hydraulic signal of default amplitude signal, frequency signal and water inlet pipe
With the corresponding relationship of pulse width signal, above-mentioned training is referred to through neural network model deep learning.No matter which kind of mode, according to
The hydraulic signal of the width signal, frequency signal and the water inlet pipe that receive exports corresponding pulse width signal, it is possible to understand that for according to pre-
The hydraulic signal of the amplitude signal, frequency signal and the water inlet pipe that are first arranged and the corresponding relationship of pulse width signal, and according to reception
The hydraulic signal of the amplitude signal, frequency signal and the water inlet pipe that arrive determines corresponding pulse width signal.
The level control unit, for receiving the first signal and pulse width signal of the input of switch 101, according to pulsewidth
Signal eliminates the fluctuation of the signal of switch 101, obtains second signal；For controlling water inlet or water outlet according to second signal.
Control water inlet or water outlet in some embodiments, refer to the start and stop of control water inlet water pump or water outlet water pump.
It is appreciated that the amplitude and frequency of liquid fluctuating are obtained by increasing wave amplitude and frequency sensor, according to preset
The corresponding relationship of amplitude signal, the hydraulic signal of frequency signal and water inlet pipe and pulse width signal obtains pulse width signal, passes through pulsewidth
Signal is eliminated because the electric signal of switch 101 fluctuates caused by liquid fluctuating, thus accurately identify the state of liquid level,
Eliminate liquid fluctuating influences caused by Liquid level.Different container fluctuating ranges and frequency may be different in the prior art
, it is available in certain containers so as to cause same set of liquid level monitoring device, and effect is poor or complete in other containers
It is not available entirely, and above-mentioned apparatus intervenes the fluctuation of the signal of switch 101 by implementing induction liquid fluctuating, thus
The present apparatus is set to can be applied to a variety of different containers.
The wave amplitude and frequency sensor and switch 101 are located at the same horizontal position in some embodiments, i.e., only
The detection that wave amplitude and frequency are carried out to preset liquid level (such as highest liquid level or minimum liquid level), to save level sensing and control
The energy consumption of system.In some embodiments, when liquid level reaches near highest liquid level, due to the fluctuation of liquid level, 101 meeting of switch
Switched to issue unstable signal by stable OFF signal, when level control unit receives the unstable signal, control
Wave amplitude and frequency sensor are started to work；When liquid level is gradually fallen after rise from high liquid level, due to the fluctuation of liquid level, switch 101
Transfer to issue unstable signal from the signal opened, until issuing the signal closed, controls wave amplitude at this time and frequency sensor stops
Work.
Wave amplitude and frequency sensor stopping/start-up operation is interpreted as stopping/starting to obtain amplitude signal and sensor letter
Number.In one embodiment, above-mentioned signal is obtained by Interruption, then by stopping/beginning Interruption and connection/
The power supply state of the energization pins of wave amplitude and frequency sensor is disconnected, to stop/starting to obtain amplitude signal and sensor letter
Number.
Wave amplitude and frequency sensor refer to the sensor of sensing liquid level wave amplitude and frequency, can be separated wave amplitude
Sensor and frequency sensor are also possible to be physically integrated sensor.Pulsewidth mode setting unit also has tune
Save the corresponding relationship of amplitude signal, frequency signal and water inlet pipe hydraulic signal and pulse width signal.That is the above-mentioned adjusting of pulsewidth refers to
With corresponding input unit, for selecting pulsewidth mode, such as pulsewidth includes but is not limited to mode one, mode two and mode
Three；It can be appreciated that above-mentioned shaping modes user adjusts amplitude signal, frequency signal and water inlet pipe according to concrete application scene
Hydraulic signal and pulse width signal corresponding relationship, i.e., specific one or more groups of amplitude signal, frequency in shaping modes one
The corresponding relationship of the hydraulic signal and pulse width signal of signal and water inlet pipe.
By adjusting amplitude signal, the corresponding relationship of frequency signal and water inlet pipe hydraulic signal and pulse width signal, thus plus
The adaptability of strong fluid level control device, can preferably adapt to the level fluctuation situation in different vessels, so as to incite somebody to action this
The fluid level control device of invention is applied in more scenes.In one embodiment, it can also be filled by adjusting shown in Fig. 2
Set manual setting pulse width signal.
The level control unit is used for before eliminating the fluctuation of signal of switch 101 according to pulse width signal, also
For eliminating the burr of the first signal.
The level control unit by way of Interruption for controlling water inlet equipment or water outlet equipment.Water inlet equipment
Refer to the equipment that liquid is conveyed into container, the equipment that water outlet equipment refers to the output liquid into container, common water inlet
Equipment or water outlet equipment are water pump.
It can be understood that above-mentioned fluid level control device can be single-chip microcontroller, it is also possible to receive by small-sized computer
After the signal of above-mentioned various sensors, and the corresponding computer program of execution, output control signal controls wetting system or water outlet
Equipment.
The computer program can be for realizing a kind of level sensing and control method, this method comprises:
S101, the amplitude signal for receiving wave amplitude and frequency sensor, frequency signal and water inlet pipe hydraulic signal, be used for root
Corresponding pulse width signal is exported according to the hydraulic signal of amplitude signal, frequency signal and the water inlet pipe received；
S102, the first signal and pulse width signal that switch 101 inputs are received, switch is eliminated according to pulse width signal
The fluctuation of 101 signal obtains second signal；
S103, water inlet or water outlet are controlled according to second signal.
Optionally, comprising: receive the hydraulic signal pass corresponding with pulse width signal of amplitude signal, frequency signal and water inlet pipe
System exports corresponding pulse width signal according to the corresponding relationship received.That is this method further include: adjust one or more groups of wave amplitude letters
Number, the corresponding relationship of the hydraulic signal of frequency signal and water inlet pipe and pulse width signal.
Above-mentioned computer program can be operate in computer, be also possible to be stored in storage medium, i.e.,
A kind of computer readable storage medium, is stored thereon with computer program, which realizes any of the above-described when being executed by processor
The step of the method.
"at least one" used herein, " one or more " and "and/or" are open statements, when in use
It can be united and separation.For example, " at least one of A, B and C ", " at least one of A, B or C ", " in A, B and C
One or more " and " one or more of A, B or C " refer to only A, only B, only C, A and B together, A and C together,
B and C together or A, B and C together.
"one" entity of term refers to one or more entities.Thus term "one", " one or more " and " extremely
Few one " be herein defined as may be used interchangeably.It should also be noted that the terms "include", "comprise" and " having " are also can be mutual
It changes and uses.
Term " automatic " used herein and its modification refer to do not have when executing processing or operation it is tangible artificial
Any processing or operation completed in the case where input.However, even if having used the execution place when executing processing or operation
The essence received before reason or operation or immaterial artificial input, the processing or operation are also possible to automatically.If
Input influences how the processing or operation will carry out, then is substantive depending on the artificial input.The processing or operation are not influenced
The artificial input carried out is not to be taken as substantive.
Term " computer-readable medium " used herein or " storage medium " refer to that participation provides instructions to processing
Any tangible storage device and/or transmission medium that device executes.Computer-readable medium can be the biography of network on ip networks
The serial command collection encoded in defeated (such as SOAP).Such medium can take many forms, including but not limited to non-volatile
Medium, Volatile media and transmission medium.Non-volatile media disk including such as NVRAM or magnetically or optically.Volatile media packet
Include the dynamic memory (such as RAM) of such as main memory.The common form of computer-readable medium includes such as floppy disk, flexibility
It is disk, hard disk, tape or any other magnetic medium, magnet-optical medium, CD-ROM, any other optical medium, punched card, paper tape, any
Other physical mediums with hole shape pattern, RAM, PROM, EPROM, FLASH-EPROM, such as storage card solid state medium, appoint
The what any other medium that can read of its storage chip or cassette, the carrier wave that describes below or computer.Email
Digital file attachment or other self-contained news files or archive set be considered as the distribution medium for being equivalent to tangible media.
When computer-readable medium is configured as database, it should be appreciated that the database can be any kind of database, such as
Relational database, hierarchical database, OODB Object Oriented Data Base etc..Correspondingly, it is believed that the present invention includes tangible media
Or distribution medium and equivalent known in the art and the medium of the following exploitation, it is stored in these media of the invention soft
Part is implemented.
Term " determination ", " operation " and " calculating " used herein and its modification may be used interchangeably, and including appointing
Method, processing, mathematical operation or the technology of what type.More specifically, wherein " " determination ", " operation " and " calculating " and its modification
Logic can be hard coded or can be and can indicated in the rule file of reading, explanation, compiling and execution.
Term " module " used herein or " tool " refer to hardware that is any of or developing later, software, consolidate
Part, artificial intelligence, fuzzy logic or be able to carry out function relevant to the element hardware and software combination.In addition, though
The present invention is described with illustrative embodiments, it is to be understood that each aspect of the present invention can individually be claimed.
It should be noted that, in this document, relational terms such as first and second and the like are used merely to a reality
Body or operation are distinguished with another entity or operation, are deposited without necessarily requiring or implying between these entities or operation
In any actual relationship or order or sequence.Moreover, the terms "include", "comprise" or its any other variant are intended to
Non-exclusive inclusion, so that the process, method, article or the terminal device that include a series of elements not only include those
Element, but also including other elements that are not explicitly listed, or further include for this process, method, article or end
The intrinsic element of end equipment.In the absence of more restrictions, being limited by sentence " including ... " or " including ... "
Element, it is not excluded that there is also other elements in process, method, article or the terminal device for including the element.This
Outside, herein, " being greater than ", " being less than ", " being more than " etc. are interpreted as not including this number；" more than ", " following ", " within " etc. understand
Being includes this number.
Although the various embodiments described above are described, once a person skilled in the art knows basic wounds
The property made concept, then additional changes and modifications can be made to these embodiments, so the above description is only an embodiment of the present invention,
It is not intended to limit scope of patent protection of the invention, it is all to utilize equivalent structure made by description of the invention and accompanying drawing content
Or equivalent process transformation, being applied directly or indirectly in other relevant technical fields, similarly includes in patent of the invention
Within protection scope.
Claims (10)
1. a kind of level sensing and control device, which is characterized in that device include: switch, water inlet pressure sensor, wave amplitude and
Frequency sensor and pulsewidth mode setting unit and level control unit；
The switch connects level control unit, the wave amplitude and frequency sensor and water inlet with pulsewidth mode setting unit
Sensor connects pulsewidth mode setting unit；
The water inlet pressure sensor exports the hydraulic signal of water inlet pipe for measuring the hydraulic pressure of water inlet pipe；
The wave amplitude and frequency sensor export amplitude signal and frequency signal for measuring liquid fluctuating amplitude and frequency；
The pulsewidth mode setting unit, for receiving the amplitude signal, frequency signal and water inlet pipe of wave amplitude and frequency sensor
Hydraulic signal, for exporting corresponding pulsewidth letter according to the hydraulic signal of width signal, frequency signal and water inlet pipe received
Number；
The level control unit disappears for receiving the first signal and pulse width signal of switch input according to pulse width signal
Except the fluctuation of the signal of switch, second signal is obtained；For controlling water inlet or water outlet according to second signal.
2. the apparatus according to claim 1, which is characterized in that described for according to amplitude signal, the frequency letter received
Number and the hydraulic signal of water inlet pipe export corresponding pulse width signal and include, for being believed according to pre-set amplitude signal, frequency
Number and water inlet pipe hydraulic signal and pulse width signal corresponding relationship, and according to receive amplitude signal, frequency signal and
The hydraulic signal of water inlet pipe determines corresponding pulse width signal.
3. the apparatus according to claim 1, which is characterized in that the wave amplitude and frequency sensor and switch are located at together
One horizontal position.
4. the apparatus according to claim 1, which is characterized in that the pulsewidth mode setting unit is for adjusting wave amplitude letter
Number, the corresponding relationship of frequency signal and water inlet pipe hydraulic signal and pulse width signal.
5. the apparatus according to claim 1, which is characterized in that the level control unit according to pulse width signal for disappearing
Before the fluctuation of the signal of switch, it is also used to eliminate the burr of the first signal.
6. the apparatus according to claim 1, which is characterized in that the level control unit is used for the side by Interruption
Formula control water inlet equipment or water outlet equipment.
7. a kind of level sensing and control method characterized by comprising
S101, the amplitude signal for receiving wave amplitude and frequency sensor, frequency signal and water inlet pipe hydraulic signal, for according to connecing
The hydraulic signal of the amplitude signal, frequency signal and the water inlet pipe that receive exports corresponding pulse width signal；
S102, the first signal and pulse width signal for receiving switch input, the signal of switch is eliminated according to pulse width signal
Fluctuation, obtain second signal；
S103, water inlet or water outlet are controlled according to second signal.
8. the method according to the description of claim 7 is characterized in that including: to receive amplitude signal, frequency signal and water inlet pipe
The corresponding relationship of hydraulic signal and pulse width signal exports corresponding pulse width signal according to the corresponding relationship received.
9. a kind of computer readable storage medium, is stored thereon with computer program, which is characterized in that the program is held by processor
The step of the method as any such as claim 7 to 8 is realized when row.
10. a kind of computer equipment, including processor and memory and it is stored on the memory and can be in the processing
The computer program executed on device, which is characterized in that realized when the processing circuit executes the computer program as right is wanted
The step of seeking 7 to 8 any the method.
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| JPS6162907A (en) * | 1984-09-05 | 1986-03-31 | Hoshizaki Electric Co Ltd | Liquid level controller |
| CN201159857Y (en) * | 2008-02-27 | 2008-12-03 | 耿迪远 | Automatic liquid level regulating device |
| CN102499031A (en) * | 2011-12-20 | 2012-06-20 | 鸡西市天合科技有限公司 | Automatic water control system for field irrigation |
| JP2016122353A (en) * | 2014-12-25 | 2016-07-07 | ニッタ・ハース株式会社 | Supplement liquid supply device |
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2017
- 2017-05-18 CN CN201710353181.XA patent/CN107203224B/en active Active
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6162907A (en) * | 1984-09-05 | 1986-03-31 | Hoshizaki Electric Co Ltd | Liquid level controller |
| CN201159857Y (en) * | 2008-02-27 | 2008-12-03 | 耿迪远 | Automatic liquid level regulating device |
| CN102499031A (en) * | 2011-12-20 | 2012-06-20 | 鸡西市天合科技有限公司 | Automatic water control system for field irrigation |
| JP2016122353A (en) * | 2014-12-25 | 2016-07-07 | ニッタ・ハース株式会社 | Supplement liquid supply device |
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| Title |
|---|
| 水肥一体化智能调控设备智能液位开关设计;付强;《农业机械学报》;20151231;第46卷;第108-115页 * |
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| CN107203224A (en) | 2017-09-26 |
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