CN106968928A - One kind takes out yellow irrigation pumping station clear water vacuum detecting and control system and detection method - Google Patents
One kind takes out yellow irrigation pumping station clear water vacuum detecting and control system and detection method Download PDFInfo
- Publication number
- CN106968928A CN106968928A CN201710208344.5A CN201710208344A CN106968928A CN 106968928 A CN106968928 A CN 106968928A CN 201710208344 A CN201710208344 A CN 201710208344A CN 106968928 A CN106968928 A CN 106968928A
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- Prior art keywords
- vacuum
- signal
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- output end
- filter
- Prior art date
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 96
- 238000001514 detection method Methods 0.000 title claims abstract description 43
- 238000005086 pumping Methods 0.000 title claims abstract description 30
- 230000002262 irrigation Effects 0.000 title claims abstract description 19
- 238000003973 irrigation Methods 0.000 title claims abstract description 19
- 238000000034 method Methods 0.000 claims abstract description 8
- 238000012545 processing Methods 0.000 claims abstract description 8
- 238000001914 filtration Methods 0.000 claims description 8
- 238000004140 cleaning Methods 0.000 claims description 7
- 239000012535 impurity Substances 0.000 claims description 7
- 239000012530 fluid Substances 0.000 claims description 4
- 229910001220 stainless steel Inorganic materials 0.000 claims description 4
- 239000010935 stainless steel Substances 0.000 claims description 4
- 238000005457 optimization Methods 0.000 abstract description 4
- 239000000463 material Substances 0.000 abstract description 3
- 238000005259 measurement Methods 0.000 description 5
- 238000004062 sedimentation Methods 0.000 description 4
- 230000007797 corrosion Effects 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000037452 priming Effects 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
- F04B49/06—Control using electricity
- F04B49/065—Control using electricity and making use of computers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D35/00—Filtering devices having features not specifically covered by groups B01D24/00 - B01D33/00, or for applications not specifically covered by groups B01D24/00 - B01D33/00; Auxiliary devices for filtration; Filter housing constructions
- B01D35/14—Safety devices specially adapted for filtration; Devices for indicating clogging
- B01D35/143—Filter condition indicators
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B51/00—Testing machines, pumps, or pumping installations
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
- F04B53/20—Filtering
Abstract
Yellow irrigation pumping station clear water vacuum detecting and control system are taken out the invention discloses one kind, including vacuum-ness detecting device, interface control unit, Clean water valve and executing agency, the output end of the Clean water valve is connected with the input of vacuum-ness detecting device, the output end of vacuum-ness detecting device is connected with the input of interface control unit, and the output end of interface control unit is connected with the input of executing agency.The detection method of the system is the method being combined using heat-conducted flow sensor and negative pressure of vacuum force detection sensor, by the water flow signal detected and negative pressure force signal, analyzed and processed through Signal Regulation processor, remove false and interference signal, to signal after processing through the work of PLC signals control output module driving executing agency, control the startup optimization of water pump, the drawbacks of overcoming detecting element short life, frequently replacing, accuracy of detection and poor accuracy, improve control accuracy, human and material resources are saved, operating efficiency is improved.
Description
Technical field
The present invention relates to a kind of measurement and control system, more particularly to one kind takes out yellow irrigation pumping station clear water vacuum detecting and control
System and detection method processed.
Background technology
It is that feed pump is vacuumized first before starting mode of pump in water conservancy takes out the operation of yellow irrigation pumping station, allows the water of priming reservoir
Water pump is entered by the suction line of pump, then starts water pump, could normal pumping irrigation, so water pump open in front pump whether
Vacuum is reached, whether clear water fills the signal detection of water pump, be to ensure that the important step that can water pump normally run.
There are following two situations so that vacuum degree measurement value and actual value in water conservancy pumping plant reclaimed water pumping vacuum running
Produce relatively large deviation：(1) although the water of suction water pump is the water precipitated by sedimentation basin, because the Yellow River water impurity is relatively more,
To the serious corrosion of detecting element, long-term erosion often makes that the detecting element life-span is very short, and accuracy of detection is poor, influence control
System；(2) fluctuation is very big during water pump suction water, and detection jitter has had a strong impact on the detection of actual value, so that control
System produces erroneous judgement, influence control.
The pumping plant user having at present feels the sound in water pump with ear to determine whether to start water pump by workman's experience；
A kind of some electric conductivity of dependence water of use, reaches two electrodes closure conductings by water level and sends electric signal driving auxiliary reclay
The control mode of control starting mode of pump reaches the control requirement for opening pump.Both modes can not all meet true in accurate detection water pump
Reciprocal of duty cycle and the requirement being controlled, it is impossible to the problem of avoiding detecting element frequent breakage and poor accuracy in detection, it is difficult to meet water
Sharp construction requirements water conservancy pumping plant is realized unattended, realizes the requirement of Automated condtrol.
The content of the invention
In order to overcome the defect of above-mentioned prior art, yellow irrigation pumping station system is taken out it is an object of the invention to provide a kind of water conservancy
System clear water vacuum degree measurement and control system, should solve the accuracy stability problem of clear water vacuum degree measurement signal, again
Ensure the service life of detecting element, it is to avoid pumping station automatization process misoperation, and further realize pumping station automatization control
It is required that.
In order to achieve the above object, the technical solution adopted in the present invention is as follows：
One kind takes out yellow irrigation pumping station clear water vacuum detecting and control system, including vacuum-ness detecting device, Interface Control list
Member, Clean water valve and executing agency, the described output end of Clean water valve are connected with the condition entry end of vacuum-ness detecting device,
The output end of vacuum-ness detecting device is connected with the input of interface control unit, and the output end of interface control unit is with performing machine
The input of structure is connected.
Described vacuum-ness detecting device include clean water filter, plugged filter detection unit, flow sensor and
Vacuum pressure sensor, the described input of clean water filter is connected with the control output end of Clean water valve, clear water filtering
Input of the output end of device respectively with plugged filter detection unit, flow sensor, vacuum pressure sensor is connected, mistake
The PLC signals of filter jam detection unit, flow sensor, the output end of vacuum pressure sensor with interface control unit are adopted
The input for collecting module is connected.
Described clean water filter is a kind of stainless steel filter, including the housing with water inlet and delivery port, peace
It is arranged with screen pack on filter core and cleaning machine loaded on the enclosure interior, filter core, the inner chamber of housing is divided into upper and lower by dividing plate
Chamber, water enters filter cavity of resorption by water inlet, is then filtered by dividing plate into screen pack, and the clear water after filtering enters upper
Chamber is discharged from delivery port, and while filtering, cleaning machine is cleared up screen pack in time.
Described plugged filter detection unit is a kind of negative pressure of vacuum force detection sensor, by exporting electric signal extremely
PLC signal acquisition modules, carrying out signal transacting by interface control unit, simultaneously sender is alarmed, and control filter progress is internal certainly
Cleaning, discharges impurity.
Described flow sensor is heat-conducted flow sensor.
Described interface control unit includes PLC signal acquisition modules, Signal Regulation processor, the control output of PLC signals
Module, the output end of PLC signal acquisition modules is connected with the input of Signal Regulation processor, the output of Signal Regulation processor
Hold and control the input of output module to be connected with PLC signals.
Described executing agency includes vacuum pump discharges controller, vavuum pump operation controller and high pressure switching-on controller,
The output end of PLC signals control output module is closed a floodgate with vacuum pump discharges controller, vavuum pump operation controller and high pressure respectively
The input of controller is connected, the work of PLC signals control output module driving executing agency, control starting mode of pump operation.
A kind of detection method for taking out yellow irrigation pumping station clear water vacuum detecting and control system, using heat-conducted flow sensor
And the vacuum water flow rate testing methods that negative pressure of vacuum force detection sensor is combined, this method, which is utilized, detects member in heat exchange principle
Part heat conducts the correlation with detected fluid flow velocity, by the water flow signal detected and detects negative pressure in vavuum pump
Signal, is analyzed and processed through Signal Regulation processor to measured signal, removes false and interference signal, signal after processing is entered
Row comparison operation is through the work of PLC signals control output module driving executing agency, control starting mode of pump operation.
Beneficial effects of the present invention：
Present invention employs the vacuum water-carrying capacity that heat-conducted flow sensor and negative pressure of vacuum force detection sensor are combined
Detection means and method, using detecting element heat conduction in heat exchange principle and the closely related relation of detected fluid flow velocity,
The water flow signal detected enters simultaneously with detecting negative pressure force signal in vavuum pump through Signal Regulation processor to measured signal
Row analyzing and processing, removes false and interference signal with control algolithm software, is compared computing to signal after processing and believes through PLC
The work of number control output module driving executing agency, control starting mode of pump operation；The measurement and control system of the present invention is put into certainly
After use, conventional detecting element is overcome because detection bad environments cause corrosion to cause component life short frequently to detecting element
The drawbacks of replacing, accuracy of detection and poor accuracy, control accuracy is greatly improved, human and material resources are saved, work is improved
Make efficiency, basically reached the purpose that pumping plant startup optimization is automatically controlled, realize that unattended control maintenance is provided for pumping plant
Ensure.
Brief description of the drawings
Fig. 1 is the structure principle chart of the present invention.
Description of reference numerals
1- vacuum-ness detecting devices, 2- interface control units, 3- Clean water valves, 4- clean water filters, 5- filters are blocked up
Plug detection unit, 6- flow sensors, 7- vacuum pressure sensors, 8-PLC signal acquisition modules, 9- Signal Regulation processors,
10-PLC signals control output module, 11- executing agencies, 12- vacuum pump discharges controllers, 13- vavuum pump operation controllers,
14- high pressure switching-on controllers.
The structural principle and operation principle of the present invention are described in detail below in conjunction with the accompanying drawings
Embodiment
Embodiment 1
As shown in figure 1, one kind takes out yellow irrigation pumping station clear water vacuum detecting and control system, including vacuum-ness detecting device 1,
Interface control unit 2, Clean water valve 3 and executing agency 11, output end and the vacuum-ness detecting device 1 of described Clean water valve 3
Condition entry end be connected, the output end of vacuum-ness detecting device 1 is connected with the input of interface control unit 2, Interface Control
The output end of unit 2 is connected with the input of executing agency 11.
Vacuum-ness detecting device 1 can carry out filtering detection, 2 pairs of detection signal numbers of interface control unit to the water for entering the pump housing
According to calculation process is identified, when reaching that control is required, control output driving executing agency 11 works, and controls water pump operation.
Embodiment 2
On the basis of embodiment 1, described vacuum-ness detecting device 1 includes clean water filter 4, plugged filter and examined
Survey unit 5, flow sensor 6 and vacuum pressure sensor 7, the input and Clean water valve 3 of described clean water filter 4
Control output end is connected, the output end of clean water filter 4 respectively with plugged filter detection unit 5, flow sensor 6, true
The input of pneumatics force snesor 7 is connected, plugged filter detection unit 5, flow sensor 6, vacuum pressure sensor 7 it is defeated
Go out input of the end with the PLC signal acquisition modules 8 of interface control unit 2 to be connected.
Described clean water filter 4 is a kind of stainless steel filter, including the housing with water inlet and delivery port, peace
It is arranged with screen pack on filter core and cleaning machine loaded on the enclosure interior, filter core, the inner chamber of housing is divided into upper and lower by dividing plate
Chamber, the water precipitated by sedimentation basin also has many suspensions, and the water precipitated enters filter cavity of resorption by water inlet, then
Filtered again into stainless steel wedge shaped filter net by dividing plate, go removal of impurities, the clear water after filtering enters epicoele from delivery port
Discharge, while filtering, cleaning machine is cleared up screen pack in time.Plugged filter detection unit 5 is negative for a kind of vacuum
Press detection sensor, can be detected to filter tube way outlet pressure signal, when filter because other impurities are blocked
Afterwards, filter tube way outlet pressure signal can produce change, and negative pressure of vacuum force detection sensor is by exporting electric signal to PLC letters
Number acquisition module 8, carries out signal transacting by interface control unit 2 and sender is alarmed, control filter 4 carries out internal from clear
Reason, discharges impurity；Flow sensor 6 is heat-conducted flow sensor, water-carrying capacity can be detected, using this sensor energy
Interference of the various impurity to the degree of accuracy of signal detection is effectively excluded, the service life of detecting element is improved；Vacuum pressure is sensed
Device 7 can be detected to vacuum in the pump housing.
Described interface control unit 2 includes being used to gather water-carrying capacity, the PLC signal acquisition modules 8 of pressure, Signal Regulation
Processor 9, PLC signal output modules 10, the output end of PLC signal acquisition modules 8 and the input phase of Signal Regulation processor 9
Even, the output end of Signal Regulation processor 9 controls the input of output module 10 to be connected with PLC signals.
Described executing agency 11 includes being used for the vacuum pump discharges controller 12 that vacuum line is vented, vacuum pump operation control
Device 13 processed, high pressure switching-on controller 14 before starting mode of pump operation, PLC signals control output module output end 10 respectively with vavuum pump
Exhaust controller 12, the input of the high pressure switching-on controller 14 of vavuum pump operation controller 13 is connected.
A kind of described detection method for taking out yellow irrigation pumping station clear water vacuum detecting and control system, employs heat-conducted stream
Vacuum water flow detection means and method that quantity sensor and negative pressure of vacuum force detection sensor are combined, utilize heat exchange principle
Middle detecting element heat conduction is with the closely related relation of detected fluid flow velocity, and the water flow signal detected is while and vavuum pump
Negative pressure force signal is inside detected, measured signal is analyzed and processed through Signal Regulation processor 9, is gone with control algolithm software
Except false and interference signal, computing is compared to signal after processing through the PLC signals control driving of output module 10 executing agency
11 work, control starting mode of pump operation.
The present invention operation principle be：Before pumping plant startup optimization, the water of sedimentation basin enters clear water mistake through Clean water valve 3
Filter after device 4, clean water filter 4 can be filtered to the water precipitated by sedimentation basin；Heat-conducted flow sensor 6 is detected
Corresponding electric signal can be exported to PLC signal acquisition modules 8 after water flow signal change, while vacuum pressure sensor 7 is detected
Pressure in the pump housing, a current signal can be also inputted when pressure reaches setting value by PLC signal acquisition modules 8, and PLC will
The data collected are analyzed and processed by Signal Regulation processor 9 to measured signal, are removed with control algolithm software empty
False and interference signal, computing is compared to signal after processing through the PLC signals control driving of output module 10 executing agency 11 work
Make, control starting mode of pump operation.
Instant invention overcomes conventional detecting element because detection bad environments cause corrosion to cause the element longevity to detecting element
The drawbacks of ordering short frequent replacing, accuracy of detection and poor accuracy, greatly improves control accuracy, saves human and material resources,
Operating efficiency is improved, the purpose that pumping plant startup optimization is automatically controlled has been basically reached, is that pumping plant realizes unattended control dimension
Shield, which is provided, to be ensured.
Claims (8)
1. one kind takes out yellow irrigation pumping station clear water vacuum detecting and control system, it is characterized in that：Including vacuum-ness detecting device (1),
Interface control unit (2), Clean water valve (3) and executing agency (11), the output end of described Clean water valve (3) are examined with vacuum
The input for surveying device (1) is connected, and the output end of vacuum-ness detecting device (1) is connected with the input of interface control unit (2),
The output end of interface control unit (2) is connected with the input of executing agency (11).
2. one kind according to claim 1 takes out yellow irrigation pumping station clear water vacuum detecting and control system, it is characterized in that：It is described
Vacuum-ness detecting device (1) include clean water filter (4), plugged filter detection unit (5), flow sensor (6) and
Vacuum pressure sensor (7), the input of described clean water filter (4) is connected with the control output end of Clean water valve (3),
The output end of clean water filter (4) is sensed with plugged filter detection unit (5), flow sensor (6), vacuum pressure respectively
The input of device (7) is connected, plugged filter detection unit (5), flow sensor (6), the output of vacuum pressure sensor (7)
The input with the PLC signal acquisition modules (8) of interface control unit (2) is held to be connected.
3. one kind according to claim 2 takes out yellow irrigation pumping station clear water vacuum detecting and control system, it is characterized in that：It is described
Clean water filter (4) be a kind of stainless steel filter, including the housing with water inlet and delivery port, be installed on the shell
Screen pack is arranged with the filter core and cleaning machine in internal portion, filter core, the inner chamber of housing is divided into upper and lower chamber by dividing plate, and water is by entering
The mouth of a river enters filter cavity of resorption, is then filtered by dividing plate into screen pack, and the clear water after filtering enters epicoele from water outlet
Mouth discharge, while filtering, cleaning machine is cleared up screen pack in time.
4. one kind according to claim 2 takes out yellow irrigation pumping station clear water vacuum detecting and control system, it is characterized in that：It is described
Plugged filter detection unit (5) be a kind of negative pressure of vacuum force detection sensor, by exporting electric signal to PLC signal acquisitions
Module (8), carries out signal transacting by interface control unit (2) and sender is alarmed, control filter (4) carries out internal from clear
Reason, discharges impurity.
5. one kind according to claim 2 takes out yellow irrigation pumping station clear water vacuum detecting and control system, it is characterized in that：It is described
Flow sensor (6) be heat-conducted flow sensor.
6. one kind according to claim 1 takes out yellow irrigation pumping station clear water vacuum detecting and control system, it is characterized in that：It is described
Interface control unit (2) include PLC signal acquisition modules (8), Signal Regulation processor (9), PLC signals control output module
(10), the output end of PLC signal acquisition modules (8) is connected with the input of Signal Regulation processor (9), Signal Regulation processor
(9) output end controls the input of output module (10) to be connected with PLC signals.
7. one kind according to claim 1 takes out yellow irrigation pumping station clear water vacuum detecting and control system, it is characterized in that：It is described
Executing agency (11) include vacuum pump discharges controller (12), vavuum pump operation controller (13) and high pressure switching-on controller
(14), the output end of PLC signals control output module (10) is controlled with vacuum pump discharges controller (12), vacuum pump operation respectively
Device (13) is connected with the input of high pressure switching-on controller (14), PLC signals control output module (10) driving executing agency
(11) work, control starting mode of pump operation.
8. based on a kind of detection for taking out yellow irrigation pumping station clear water vacuum detecting and control system described in claim any one of 1-7
Method, it is characterized in that：This method utilizes the conduction of detecting element heat and the correlation of detected fluid flow velocity in heat exchange principle,
Negative pressure force signal is detected the water flow signal detected and in vavuum pump, measured signal is carried out through Signal Regulation processor
Analyzing and processing, removes false and interference signal, and computing is compared to signal after processing and is driven through PLC signals control output module
Dynamic executing agency's work, control starting mode of pump operation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710208344.5A CN106968928B (en) | 2017-03-31 | 2017-03-31 | A kind of yellow irrigation pumping station clear water vacuum detecting of pumping and control system and detection method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710208344.5A CN106968928B (en) | 2017-03-31 | 2017-03-31 | A kind of yellow irrigation pumping station clear water vacuum detecting of pumping and control system and detection method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106968928A true CN106968928A (en) | 2017-07-21 |
| CN106968928B CN106968928B (en) | 2019-02-19 |
Family
ID=59336291
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710208344.5A Active CN106968928B (en) | 2017-03-31 | 2017-03-31 | A kind of yellow irrigation pumping station clear water vacuum detecting of pumping and control system and detection method |
Country Status (1)
| Country | Link |
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| CN (1) | CN106968928B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110608164A (en) * | 2019-10-28 | 2019-12-24 | 苏州工业职业技术学院 | Positive and negative pressure test equipment for fuel pump |
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| US4124332A (en) * | 1975-05-19 | 1978-11-07 | Matsushita Electric Industrial Company, Limited | Automatically operative pumping equipment |
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| CN201613053U (en) * | 2010-02-01 | 2010-10-27 | 蔡忠 | Automatic high-efficient backflushing clear water filter |
| CN104329268A (en) * | 2014-09-26 | 2015-02-04 | 徐州圣能科技有限公司 | Mine draining pump control system |
| CN204386649U (en) * | 2015-01-12 | 2015-06-10 | 温州乐控节能科技有限公司 | A kind of Mine Drainage System |
| CN206647248U (en) * | 2017-03-31 | 2017-11-17 | 中国重型机械研究院股份公司 | A kind of water conservancy takes out yellow irrigation pumping station clear water vacuum detecting and control system |
-
2017
- 2017-03-31 CN CN201710208344.5A patent/CN106968928B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4124332A (en) * | 1975-05-19 | 1978-11-07 | Matsushita Electric Industrial Company, Limited | Automatically operative pumping equipment |
| CN201081777Y (en) * | 2007-04-30 | 2008-07-02 | 深圳克拉克自动化控制有限公司 | Scale-free heat conductive flow controller |
| CN201526470U (en) * | 2009-11-17 | 2010-07-14 | 天津市引滦工程尔王庄管理处 | Vacuum water-inducing control device Centrifugal pump |
| CN201613053U (en) * | 2010-02-01 | 2010-10-27 | 蔡忠 | Automatic high-efficient backflushing clear water filter |
| CN104329268A (en) * | 2014-09-26 | 2015-02-04 | 徐州圣能科技有限公司 | Mine draining pump control system |
| CN204386649U (en) * | 2015-01-12 | 2015-06-10 | 温州乐控节能科技有限公司 | A kind of Mine Drainage System |
| CN206647248U (en) * | 2017-03-31 | 2017-11-17 | 中国重型机械研究院股份公司 | A kind of water conservancy takes out yellow irrigation pumping station clear water vacuum detecting and control system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110608164A (en) * | 2019-10-28 | 2019-12-24 | 苏州工业职业技术学院 | Positive and negative pressure test equipment for fuel pump |
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| Publication number | Publication date |
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| CN106968928B (en) | 2019-02-19 |
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