CN109322346A - A kind of asynchronous water system of multi-pipeline and its working method - Google Patents
A kind of asynchronous water system of multi-pipeline and its working method Download PDFInfo
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- CN109322346A CN109322346A CN201811286192.1A CN201811286192A CN109322346A CN 109322346 A CN109322346 A CN 109322346A CN 201811286192 A CN201811286192 A CN 201811286192A CN 109322346 A CN109322346 A CN 109322346A
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 121
- 238000000034 method Methods 0.000 title claims abstract description 12
- 239000007788 liquid Substances 0.000 claims abstract description 54
- 230000003139 buffering effect Effects 0.000 claims description 7
- 230000008033 biological extinction Effects 0.000 claims description 3
- 238000003825 pressing Methods 0.000 claims description 3
- 230000002572 peristaltic effect Effects 0.000 description 7
- 101100408453 Arabidopsis thaliana PLC5 gene Proteins 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000002347 injection Methods 0.000 description 3
- 239000007924 injection Substances 0.000 description 3
- 238000009434 installation Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 239000008400 supply water Substances 0.000 description 3
- 239000003513 alkali Substances 0.000 description 2
- 230000001458 anti-acid effect Effects 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 235000013399 edible fruits Nutrition 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000004800 polyvinyl chloride Substances 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000000741 silica gel Substances 0.000 description 1
- 229910002027 silica gel Inorganic materials 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03B—INSTALLATIONS OR METHODS FOR OBTAINING, COLLECTING, OR DISTRIBUTING WATER
- E03B1/00—Methods or layout of installations for water supply
- E03B1/04—Methods or layout of installations for water supply for domestic or like local supply
-
- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03B—INSTALLATIONS OR METHODS FOR OBTAINING, COLLECTING, OR DISTRIBUTING WATER
- E03B7/00—Water main or service pipe systems
- E03B7/07—Arrangement of devices, e.g. filters, flow controls, measuring devices, siphons or valves, in the pipe systems
- E03B7/078—Combined units with different devices; Arrangement of different devices with respect to each other
-
- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03B—INSTALLATIONS OR METHODS FOR OBTAINING, COLLECTING, OR DISTRIBUTING WATER
- E03B7/00—Water main or service pipe systems
- E03B7/09—Component parts or accessories
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- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Hydrology & Water Resources (AREA)
- Public Health (AREA)
- Water Supply & Treatment (AREA)
- Control Of Positive-Displacement Pumps (AREA)
Abstract
The present invention relates to a kind of asynchronous water system of multi-pipeline and its working methods.The asynchronous water system of the multi-pipeline, including force (forcing) pump, buffer unit and a are a for water end (W.E.)；Wherein, preceding a-1 is connected to by pulsating pump with gathering tube for water end (W.E.), is passed through water inlet pipe for water end (W.E.) and is directly connected to gathering tube for a-th, and force (forcing) pump and preceding a-1 pulsating pump are connect with PLC respectively；The present invention carries out buffer protection to sample introduction liquid using buffer unit and one-way flow valve, when force (forcing) pump breaks down, the problem of liquid of pulsating pump sucking can exist in buffer unit, pipeline is effectively prevent to burst apart.
Description
Technical field
The present invention relates to a kind of asynchronous water system of multi-pipeline and its working methods, belong to the technology of laboratory water systems
Field.
Background technique
Reactor water supply requirement high control precision in laboratory usually matches reality with peristaltic pump by the time relay
It is existing, since laboratory upflow-type reactor needs to supply water from bottom, supplies water and need certain lift.Most domestic at present
Laboratory reactor, which supplies water, usually has two when same reactor needs quantitatively to convey plurality of liquid using single water supplying pump
Kind method, in which:
One is using more big lift peristaltic pump parallel connection, it is made to draw different liquids pressurized delivered, every wriggling respectively
Pump is equipped with a time relay and controls its sample injection time, to guarantee that multi-pipeline quantitatively conveys liquid.Since big lift is compacted
It is dynamic to pump higher cost and take up a large area, therefore advantage is had no in terms of the reactor quantitative sample injection of laboratory, using by one
Fixed restriction and influence.
Another kind is to be connected in series to pressurization (wriggling) pump after more water suctions (wriggling) to be pumped to drawing liquid in parallel again to convey,
Such as i (i >=2) kind liquid is conveyed simultaneously, it usually needs (i kind liquid, the number for conveying the pump of liquid is greater than 1 to j, small
In being equal to i pump, the number of pump used indicates with j, so the number range of j is between 1~i, 1≤j≤i) a water suction wriggling
Pump draws i kind liquid respectively, and peristaltic pump that pressurizes of connecting again after being summarized this i kind liquid by multiple-way valve is conveyed, adopted
The method for synchronizing sample introduction with multi-pipeline, and pass through the time relay and control the wriggling pump startup time.
In order to guarantee that water system works normally, it is necessary to assure: (1) pressurize pump startup time >=It absorbs water the pump startup time；
(2)Pulsating pump startup stage was both needed in force (forcing) pump startup stage；(3) the sum of pressurization pump discharge >=all water suctions pump discharge.
In addition, the restrictive condition that second of water system operates normally further includes, pressurization (peristaltic pump) pump price is more expensive, supplies
Water pressure deviation is big, and control mode is simple, and stability, followability are poor, resists dry rich ability poor, has a single function；The time relay longevity
Order short, water pump takes up a large area, and user installation is inconvenient to use, and water supply device piping connection is complicated, Measuring error transformation and upgrade
Difficulty is big.And when accident or the pressurization anhydrous pressure of failure of pump occurs in the time relay, water system be can not work normally, and will go out
The problems such as existing pipeline bursts apart.Traditional water supply device and the suitability of other water equipments are poor, can not achieve laboratory reaction
The water supply requirement of device high quality.
It is therefore necessary to propose a kind of new technical solution, to solve the above technical problems.
Summary of the invention
In view of the deficiencies of the prior art, the present invention provides a kind of asynchronous water system of multi-pipeline.
The present invention provides a kind of working method of above-mentioned asynchronous water system.
The technical solution of the present invention is as follows:
A kind of asynchronous water system of multi-pipeline, including force (forcing) pump, buffer unit and a are a for water end (W.E.)；Wherein, preceding a-1 confession
Water end (W.E.) be connected to by pulsating pump with gathering tube, is passed through water inlet pipe for water end (W.E.) and is directly connected to gathering tube for a-th, and gathering tube passes through three
The reduction of fractions to a common denominator is not connected to buffer unit and force (forcing) pump；Force (forcing) pump and preceding a-1 pulsating pump are connect with PLC respectively；Wherein, start the period
The pulsating pump number in aliquot pressurization pump startup period is b, the pulsating pump in aliquant pressurization pump startup period in starting period
Number is a-1-b；a≥2.
Preferred according to the present invention, the flow of force (forcing) pump is Q, ifThe calculating of pressurization pump discharge Q is as follows:
When c is integer,
When c is non-integer,Wherein, qxTo start the period
The flow of x-th of pulsating pump, q in the pulsating pump in aliquot pressurization pump startup periodyIt is opened for starting period aliquant force (forcing) pump
The flow of y-th of pulsating pump in the pulsating pump in dynamic period；T is the starting period of force (forcing) pump；TxFor starting period aliquot pressurization
The starting period of x-th of pulsating pump, T in the pulsating pump in pump startup periodyTo start the aliquant pressurization pump startup period in period
Pulsating pump in y-th of pulsating pump the starting period；Q ' is the flow of water inlet pipe." [] " is to be rounded symbol, and [x] is indicated to " x "
It is rounded.
Preferred according to the present invention, the buffer unit is bumping bag.The bumping bag is to be provided only with an Inlet and outlet water
Pipeline, deformable, anti acid alkali performance and the stable hermetic bag of physicochemical properties, do not occur physical chemistry with liquid in pipeline
Reaction；PP material, silica gel or PVC material production with polytetrafluoroethyllining lining can be used.
It is further preferred that the maximum volume of bumping bag Wherein, KzFor safety coefficient, Kz=1.2~
1.5；qxFor the flow of x-th of pulsating pump in the pulsating pump in starting period aliquot pressurization pump startup period, qyNot for the starting period
The flow of y-th of pulsating pump in the pulsating pump in aliquot pressurization pump startup period；T is the starting period of force (forcing) pump；TxFor starting
The starting period of x-th of pulsating pump, T in the pulsating pump in period aliquot pressurization pump startup periodyIt is aliquant for the starting period
The starting period of y-th of pulsating pump in the pulsating pump in pressurization pump startup period；" [] " is to be rounded symbol, and [x] expression takes " x "
It is whole, such as
It is preferred according to the present invention, it is described to be connected to for water end (W.E.) with water suction pump seal；The suction side of pulsating pump passes sequentially through water
Valve and one-way flow valve are connected to for water end (W.E.)；The lift end of pulsating pump is connected to gathering tube；The lift end of force (forcing) pump is connected to use
Water l oad.
Preferred according to the present invention, the head of the buffer unit is higher than the head for water end (W.E.), lower than water suction pump lift end
Head." head " herein refers to level head and pressure head.
Preferred according to the present invention, the force (forcing) pump water inlet end is provided with one-way flow valve.One-way flow valve is also known as non-return
Valve flows and automatic open and close flap by medium itself, the valve for preventing medium from flowing backwards, individual event flowing valve installation in pipeline
Direction is that water flow passes through peristaltic pump direction to open.
Preferred according to the present invention, the pulsating pump and force (forcing) pump are fixed frequency pump or variable frequency pump.
A kind of working method of above-mentioned asynchronous water system, comprises the following steps that
1) when supplying c kind liquid simultaneously, c-1 pulsating pump is selected to draw c-1 kind liquid respectively, force (forcing) pump passes through water inlet
Pipe directly draws c kind liquid；c≤a；
2) each pulsating pump runing time and period are controlled by PLC, it is ensured that preceding c-1 kind liquid timing, quantitative conveying；Together
When by PLC control force (forcing) pump starting time and period, guarantee before c-1 kind liquid pressing conveying while realize c kind liquid
The conveying of body；Flow due to determining frequency pump be it is fixed, so the time of each water suction pump startup is different, therefore pass through PLC control
The time for making its operation reaches efficient accurate control effect；And simultaneously because each pump operation time have differences, therefore with slow
Flushing device is protected.
2.1) when absorb water pump operation when, if force (forcing) pump is in halted state, the one-way flow valve of pulsating pump suction side is anti-
Only liquid flows back to for water end (W.E.) and flows into buffer unit and store；
2.2) when pulsating pump stops working, pressurize pump operation when, since the head of buffering apparatus is higher than the head for water end (W.E.), add
Press pump preferentially absorbs water the liquid in buffer unit, after liquid extinction in buffer unit, then from a-th for liquid draw in water end (W.E.)
Body；
2.3) when force (forcing) pump and pulsating pump are run simultaneously, since the head at water suction pump lift end is higher than the water of buffering apparatus
Head, force (forcing) pump preferentially draw the liquid at water suction pump lift end, then draw the liquid in buffer unit, finally draw a-th of water supply
Liquid in end.
In conclusion no matter whether pulsating pump runs simultaneously with force (forcing) pump, it can guarantee the normal operation of water system.
The invention has the benefit that
1. the asynchronous water system of multi-pipeline of the present invention realizes the effect that asynchronous multi-pipeline quantitative sample injection buffering ensures
Fruit carries out buffer protection to sample introduction liquid using buffer unit and one-way flow valve, and when force (forcing) pump breaks down, pulsating pump is inhaled
The problem of liquid entered can exist in buffer unit, pipeline is effectively prevent to burst apart；
2. the asynchronous water system of multi-pipeline of the present invention, when using buffer unit and programmable logic controller (PLC) (PLC)
Between control system cooperation, realize intake pump need not be run simultaneously with force (forcing) pump, reduce the somewhat complex design to the time relay
Problem extends the service life of the time relay, simple and practical.
3. a pressurization peristaltic pump is used only in the present invention in water supply process, remaining pulsating pump, which is all made of, determines the small pump of frequency, drop
The low economic cost of system；Runing time and the period that each pump is controlled using PLC are not needed using time relay on the market
The starting of device control pump, extends system service life, reduces occupied area, pipeline is simple, and Measuring error transformation and upgrade are simple；
Meanwhile by press peristaltic pump, pulsating pump, PLC combination, reduce pressure of supply water deviation, effectively increase stability, with
Casual and anti-dry rich ability.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the asynchronous water system of multi-pipeline of the present invention；
Wherein, 1, one-way flow valve；2, for water end (W.E.)；3, water valve；4, pulsating pump；5,PLC；6, bumping bag；7, gathering tube；8,
Force (forcing) pump；9, water inlet pipe.
Specific embodiment
Below with reference to embodiment and Figure of description, the present invention will be further described, but not limited to this.
Embodiment 1
As shown in Figure 1.
A kind of asynchronous water system of multi-pipeline, including force (forcing) pump 8, buffer unit and a are a for water end (W.E.) 2；Wherein, preceding a-1
It is connected to by pulsating pump 4 with gathering tube 7 for water end (W.E.) 2, passes through water inlet pipe 9 for water end (W.E.) and be directly connected to gathering tube 7 for a-th, summarized
Pipe 7 is connected to buffer unit and force (forcing) pump 8 respectively by threeway；Force (forcing) pump 8 and preceding a-1 pulsating pump 4 are connect with PLC5 respectively；
Wherein, it is b that starting period aliquot force (forcing) pump 8, which starts 4 numbers of pulsating pump in period, and starting period aliquant force (forcing) pump 8 opens
4 numbers of pulsating pump in dynamic period are a-1-b；a≥2.
The buffer unit is bumping bag 6.The bumping bag 6 be provided only with an inlet and outlet pipe lines, it is deformable,
Anti acid alkali performance and the stable hermetic bag of physicochemical properties, do not occur physical-chemical reaction with liquid in pipeline；The present embodiment
Bumping bag 6 is made using the PP material with polytetrafluoroethyllining lining.
It is described to be connected to for water end (W.E.) 1 with the sealing of pulsating pump 4；The suction side of pulsating pump 4 passes sequentially through water valve 3 and one-way flow valve
1 is connected to for water end (W.E.) 2；The lift end of pulsating pump 4 is connected to gathering tube 7；The lift end of force (forcing) pump 8, which is connected to, uses Water l oad.Institute
Stating pulsating pump 4 is the fixed small pump of frequency, and force (forcing) pump 8 is that fixed frequency pumps.
8 water inlet end of force (forcing) pump is provided with one-way flow valve.One-way flow valve is also known as check-valves, relies on medium itself
It flows and automatic open and close flap, the valve for preventing medium from flowing backwards, individual event flowing valve installation direction is water flow by wriggling in pipeline
Pump direction is to open.
Embodiment 2
The asynchronous water system of multi-pipeline as described in Example 1, further, the flow of force (forcing) pump 8 are Q, if
The calculating of pressurization pump discharge Q is as follows:
When c is integer,
When c is non-integer,Wherein, qxTo start period energy
Divide exactly the flow that force (forcing) pump 8 starts x-th of pulsating pump in the pulsating pump 4 in period, qyIt is opened for starting period aliquant force (forcing) pump 8
The flow of y-th of pulsating pump 4 in the pulsating pump 4 in dynamic period；T is the starting period of force (forcing) pump 8；TxAdd for starting period aliquot
Press pump 8 starts the starting period of x-th of pulsating pump 4 in the pulsating pump 4 in period, TyIt is opened for starting period aliquant force (forcing) pump 8
The starting period of y-th of pulsating pump 4 in the pulsating pump 4 in dynamic period；Q ' is the flow of water inlet pipe 9." [] " is to be rounded symbol, [x]
It indicates to be rounded " x ".
Embodiment 3
The asynchronous water system of multi-pipeline as described in Example 1, further, the maximum volume of bumping bag 6 Wherein, KzFor safety coefficient, Kz=1.3；qxFor starting
Period aliquot force (forcing) pump 8 starts the flow of x-th of pulsating pump 4 in the pulsating pump 4 in period, qyFor starting the period it is aliquant plus
Press pump 8 starts the flow of y-th of pulsating pump 4 in the pulsating pump 4 in period；T is the starting period of force (forcing) pump 8；TxTo start the period
Aliquot force (forcing) pump 8 starts the starting period of x-th of pulsating pump 4 in the pulsating pump 4 in period, TyFor starting the period it is aliquant plus
Press pump 8 starts the starting period of y-th of pulsating pump 4 in the pulsating pump 4 in period；" [] " is to be rounded symbol, and [x] expression takes " x "
It is whole, such asStart 1 minute within force (forcing) pump every 10 minutes in the present embodiment, T=10；
Embodiment 4
The asynchronous water system of multi-pipeline as described in Example 1, further, the head of the buffer unit, which is higher than, to supply water
The head at end 2, lower than the head at 4 lift end of pulsating pump.
Embodiment 5
The working method of asynchronous water system, comprises the following steps that as described in embodiment 1-4
1) when supplying c kind liquid simultaneously, c-1 pulsating pump 4 is selected to draw c-1 kind liquid respectively, force (forcing) pump 8 by into
Water pipe 9 directly draws c kind liquid；c≤a；
2) each 4 runing time of pulsating pump and period are controlled by PLC5, it is ensured that preceding c-1 kind liquid timing, quantitative conveying；
The starting time and period for controlling force (forcing) pump 8 by PLC5 simultaneously realize c while the conveying of c-1 kind liquid pressing before guaranteeing
The conveying of kind liquid；Flow due to determining frequency pump be it is fixed, so the time that each pulsating pump 4 starts is different, therefore pass through
PLC5 controls the time of its operation, reaches efficient accurate control effect；And simultaneously because each pump operation time have differences,
Therefore it is protected with buffer unit.
2.1) when pulsating pump 4 is run, if force (forcing) pump 8 is in halted state, the one-way flow valve of 4 suction side of pulsating pump
1 prevents liquid from flowing back to for water end (W.E.) 1 and flowing into buffer unit and store；
2.2) when pulsating pump 4 stops working, and force (forcing) pump 8 is run, the water for water end (W.E.) 1 is higher than due to the head of buffering apparatus
Head, the preferential liquid in water suction buffer unit of force (forcing) pump 8, after liquid extinction in buffer unit, then from a-th for water end (W.E.) 1
Middle absorption liquid；
2.3) when force (forcing) pump 8 and pulsating pump 4 are run simultaneously, since the head at 4 lift end of pulsating pump is higher than buffering apparatus
Head, force (forcing) pump 8 preferentially draw the liquid at 4 lift end of pulsating pump, then draw the liquid in buffer unit, finally draw a-th
For the liquid in water end (W.E.) 1.
In conclusion no matter whether pulsating pump runs simultaneously with force (forcing) pump, it can guarantee the normal operation of water system.
Claims (9)
1. a kind of asynchronous water system of multi-pipeline, which is characterized in that including force (forcing) pump, buffer unit and a for water end (W.E.)；Wherein,
Preceding a-1 be connected to by pulsating pump with gathering tube for water end (W.E.), is passed through water inlet pipe for water end (W.E.) and is directly connected to gathering tube for a-th, remittance
General pipeline is connected to buffer unit and force (forcing) pump respectively by threeway；Force (forcing) pump and preceding a-1 pulsating pump are connect with PLC respectively；Its
In, the pulsating pump number in starting period aliquot pressurization pump startup period is b, starts the aliquant pressurization pump startup period in period
Pulsating pump number be a-1-b；a≥2.
2. the asynchronous water system of multi-pipeline according to claim 1, which is characterized in that the flow of force (forcing) pump is Q, if The calculating of pressurization pump discharge Q is as follows:
When c is integer,
When c is non-integer,Wherein, qxIt can be whole for the starting period
Except the flow of x-th of pulsating pump in the pulsating pump in pressurization pump startup period, qyFor aliquant pressurization pump startup week in starting period
The flow of y-th of pulsating pump in the pulsating pump of phase；T is the starting period of force (forcing) pump；TxIt is opened for starting period aliquot force (forcing) pump
The starting period of x-th of pulsating pump, T in the pulsating pump in dynamic periodyFor the suction in aliquant pressurization pump startup period in starting period
The starting period of y-th of pulsating pump in water pump；Q ' is the flow of water inlet pipe.
3. the asynchronous water system of multi-pipeline according to claim 1, which is characterized in that the buffer unit is bumping bag.
4. the asynchronous water system of multi-pipeline according to claim 3, which is characterized in that the maximum volume of bumping bagWherein, KzFor safety coefficient, Kz=1.2~
1.5；qxFor the flow of x-th of pulsating pump in the pulsating pump in starting period aliquot pressurization pump startup period, qyNot for the starting period
The flow of y-th of pulsating pump in the pulsating pump in aliquot pressurization pump startup period；T is the starting period of force (forcing) pump；TxFor starting
The starting period of x-th of pulsating pump, T in the pulsating pump in period aliquot pressurization pump startup periodyIt is aliquant for the starting period
The starting period of y-th of pulsating pump in the pulsating pump in pressurization pump startup period.
5. the asynchronous water system of multi-pipeline according to claim 1, which is characterized in that described for water end (W.E.) and water suction pump seal
Connection；The suction side of pulsating pump passes sequentially through water valve and one-way flow valve is connected to for water end (W.E.)；The lift end of pulsating pump with summarize
Pipe connection；The lift end of force (forcing) pump, which is connected to, uses Water l oad.
6. the asynchronous water system of multi-pipeline according to claim 1, which is characterized in that the head of the buffer unit is higher than
For the head of water end (W.E.), lower than the head at water suction pump lift end.
7. the asynchronous water system of multi-pipeline according to claim 1, which is characterized in that the force (forcing) pump water inlet end is provided with
One-way flow valve.
8. the asynchronous water system of multi-pipeline according to claim 1, which is characterized in that the pulsating pump and force (forcing) pump are fixed
Frequency pump or variable frequency pump.
9. the working method of asynchronous water system as described in claim 1-8 any one, which is characterized in that such as including step
Under:
1) when supplying c kind liquid simultaneously, c-1 pulsating pump is selected to draw c-1 kind liquid respectively, force (forcing) pump is straight by water inlet pipe
It connects and draws c kind liquid；c≤a；
2) each pulsating pump runing time and period are controlled by PLC, it is ensured that preceding c-1 kind liquid timing, quantitative conveying；Lead to simultaneously
The starting time and period for crossing PLC control force (forcing) pump realize c kind liquid while the conveying of c-1 kind liquid pressing before guaranteeing
Conveying；
2.1) when absorb water pump operation when, if force (forcing) pump is in halted state, the one-way flow valve of pulsating pump suction side prevents liquid
Body flows back to for water end (W.E.) and flows into buffer unit and store；
2.2) when pulsating pump stops working, pressurize pump operation when, since the head of buffering apparatus is higher than the head for water end (W.E.), force (forcing) pump
Liquid in preferential water suction buffer unit, after liquid extinction in buffer unit, then from a-th for drawing liquid in water end (W.E.)；
2.3) when force (forcing) pump and pulsating pump are run simultaneously, since the head at water suction pump lift end is higher than the head of buffering apparatus, add
Press pump preferentially draws the liquid at water suction pump lift end, then draws the liquid in buffer unit, finally draws a-th in water end (W.E.)
Liquid.
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| CN107143004A (en) * | 2017-06-15 | 2017-09-08 | 温州大学 | A kind of equal flow circuit of water system filtered based on PWM |
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