CN107338830A - A kind of intelligent EPP constant pressure water supply systems and its control method - Google Patents
A kind of intelligent EPP constant pressure water supply systems and its control method Download PDFInfo
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- CN107338830A CN107338830A CN201710776061.0A CN201710776061A CN107338830A CN 107338830 A CN107338830 A CN 107338830A CN 201710776061 A CN201710776061 A CN 201710776061A CN 107338830 A CN107338830 A CN 107338830A
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 114
- 238000000034 method Methods 0.000 title claims abstract description 19
- 239000008400 supply water Substances 0.000 claims abstract description 39
- 241000009298 Trigla lyra Species 0.000 claims abstract description 3
- 229910000831 Steel Inorganic materials 0.000 claims description 23
- 239000010959 steel Substances 0.000 claims description 23
- 238000006243 chemical reaction Methods 0.000 claims description 15
- 210000000232 gallbladder Anatomy 0.000 claims description 10
- 238000007789 sealing Methods 0.000 claims description 7
- 230000003139 buffering effect Effects 0.000 claims description 5
- 239000007788 liquid Substances 0.000 claims description 4
- 238000003860 storage Methods 0.000 claims description 4
- 238000012544 monitoring process Methods 0.000 claims description 2
- 238000001816 cooling Methods 0.000 description 22
- 239000000498 cooling water Substances 0.000 description 9
- 238000004519 manufacturing process Methods 0.000 description 7
- 230000008569 process Effects 0.000 description 7
- 238000007493 shaping process Methods 0.000 description 5
- 238000005507 spraying Methods 0.000 description 5
- 230000008859 change Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 230000035800 maturation Effects 0.000 description 3
- 238000000465 moulding Methods 0.000 description 3
- 230000004224 protection Effects 0.000 description 3
- 238000010030 laminating Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- 241000196324 Embryophyta Species 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000002386 leaching Methods 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000003020 moisturizing effect Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 230000032258 transport Effects 0.000 description 1
- 239000002699 waste material Substances 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
- F04B49/08—Regulating by delivery pressure
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (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 intelligent EPP constant pressure water supply systems and its control method, described constant pressure water supply system includes the water tank being sequentially connected by pipeline, pump tube component and EPP forming machines, between pump tube component and EPP forming machines pressure sensor is additionally provided with pipeline, described pump tube component includes the multiple water pumps conveying branch road being arranged in parallel, include valve group and the supply-water pump that control piper is opened or closed on every water pump conveying branch road, described water system also includes control assembly, the control assembly connects pressure sensor respectively, supply-water pump and valve group.Compared with prior art, water system of the invention can automatically control the quantity for the water pump that puts into operation according to produce reality situation, participated in without artificial, realize intelligent control of EPP constant pressure water supplies etc..
Description
Technical field
The present invention relates to the uncertain Isobarically Control field of water consumption, more particularly, to a kind of intelligent EPP constant pressure water supplies
System and its control method.
Background technology
The contour machining procedure process of EPP products mainly includes：Matched moulds, filler, steam heating, spraying cooling are shaped, are de-
Several processes such as mould.Wherein spraying cooling process is an important step in EPP forming processes, during the main medium of cooling is
The cooling water of temperature, by declining EPP products and mold surface temperature to the spraying cooling of mould, reach product approval
Purpose, meanwhile, it can also shorten EPP molding cycle, improve production efficiency.In the molding cycle of an EPP product, spray
Leaching cooling and shaping accounts for half the time.For production for large batch of EPP shaping machine sets, the spray of every EPP forming machine
Cool time can be very different according to different products, and the requirement of the cooling water of spraying cooling is dynamic change, have very
Big uncertainty.
Constantly promoted with the application of EPP products, EPP cooling systems are not also with the molding process of EPP products
Disconnected development.The evolution of EPP cooling systems mainly has following several stages：
In stage before pump class frequency conversion control technique maturation, in this period, more water pumps of EPP cooling systems are formed, this
A little water pumps are typically the motor direct-drive by power frequency operation, are manually operated, and run the water pumps of different number of units to meet EPP
The needs with water of the spraying cooling of shaping machine set.The EPP cooling system structures in this stage are comparatively simple.In EPP forming machines
Group production quantity generally requires artificially to go the quantity of control operation water pump when varying widely, operationally not very convenient,
Meanwhile the water pump in this period does not have VFC, in the shaping real process of EPP products, the output of cooling system leads to
Being actually needed for EPP shaping machine sets can be often more than, energy waste is than more serious.
Stage after pump class frequency conversion control technique maturation, in this period, with the maturation of pump class converter technology, water pump
Energy-saving and frequency-variable technology also applied in EPP cooling systems.Generally use is common in this stage EPP cooling systems
Constant pressure pumping plant realize constant pressure water supply, typical structure be the water pump of a power frequency operation, one can be with frequency conversion and unvarying pressure control
Water pump composition.In this structure, constant pressure water supply function, while this set system can be realized when water consumption is relatively more fixed
Structure of uniting is compact, and Technical comparing is ripe.But for there is very big uncertainty as EPP production processes water consumption
Cooling system, the constant pressure water supply system of this structure can not just meet actual production requirement.
A kind of constant pressure water supply systems of Chinese patent ZL201520995030.0, including main water supply loop, laminate water supply
Loop and control device, the water side of main water supply loop connect with the water side for laminating water supply loop, laminate and are gone here and there on water supply loop
Provided with steady-flow tank, laminate water pump and it is at least one laminate valve, this laminate also be equiped with water supply loop laminates pressure gauge, control
Device sampling connection processed laminates pressure gauge, and control connection laminates water pump.Original water supply loop is used for frequency conversion of the peak with the water period
Constant pressure water supply, and the newly-increased constant pressure water supply for laminating water supply loop and being mainly used in the low discharge water supply period, are solved small
When under flow or zero delivery, the problem of pump efficiency is greatly lowered, the purpose of energy-conservation can be effectively realized.But it is still
The constant pressure water supply of the great fluctuation process scope in EPP production processes can not be adapted to.
The content of the invention
It is an object of the present invention to overcome the above-mentioned drawbacks of the prior art and provide a kind of intelligent EPP constant pressures
Water system and its control method.
The purpose of the present invention can be achieved through the following technical solutions：
A kind of intelligent EPP constant pressure water supply systems, including be sequentially connected by pipeline water tank, pump tube component and
EPP forming machines, pressure sensor, described pump tube are additionally provided with pipeline between pump tube component and EPP forming machines
Component includes the multiple water pumps conveying branch road being arranged in parallel, and includes what control piper was opened or closed on every water pump conveying branch road
Valve group and supply-water pump, described water system also include control assembly, and the control assembly connects pressure sensor, supplied water respectively
Pump and valve group.
Preferably, described control assembly includes PID regulator, frequency converter, frequency conversion contactor, power frequency contactor and electricity
Source, described PID regulator connect and receive the pressure signal of pressure sensor feedback, and export corresponding Regulate signal to
Frequency converter, described power supply draw two branch roads, wherein one is sequentially connected frequency converter and frequency conversion contactor, another directly connects
Power frequency contactor is connect, each frequency conversion contactor and a power frequency contactor are corresponding to be combined and connect one supply-water pump of control
Motor operation.
Preferably, a buffering branch road is also drawn between described pressure sensor and EPP forming machines, on buffering branch road
It is provided with diaphragm-type air-compressed tank.
It is furthermore preferred that described diaphragm-type air-compressed tank includes tank body, tank interior is provided with full courage formula gall-bladder, led to above tank body
Cross flange and be connected with inflation unit, inflation unit is connected by gas tube with gall-bladder, and access pump tube is provided with below tank body
The liquid entrance of pipeline between component and EPP forming machines.
Even more preferably, described inflation unit includes being arranged on flange steel seat, it is arranged on above steel seat simultaneously
The steel lid of connection is secured to, and is arranged on steel seat and connects the charging connector seat of the gall-bladder, the steel lid and steel seat, steel
Sealed between seat and charging connector seat using sealing gasket, and form double sealing structure.
Preferably, described water pump conveying branch road is provided with three.
Preferably, described valve group includes being separately positioned on two butterfly valves at supply-water pump both ends, close to EPP forming machines
Butterfly valve and supply-water pump between be additionally provided with check-valves.
Preferably, described water tank also connects outside pond by draw water pipeline, and the dischargeable capacity of water tank, which is more than, takes out
More than 2 times of water lines volume, while level sensor is additionally provided with the water storage top tank structure, the level sensor also feeds back control
Make the water pump.
Preferably, described pressure sensor includes two pressures being successively set on the outlet pipeline of pump tube component
Power table, one of them is distance-transmission pressure gauge, and another is superpressure preventing power table, is controlled described in described two equal feedback links of pressure gauge
Component.
The control method of intelligent EPP constant pressure water supply systems, preferably includes following steps：
(1) system starts automatic running；
(2) pipeline between the pump tube module outlet and EPP forming machines under the current opening of pressure sensor monitoring
Loine pressure PV, and feed back to control assembly, by control assembly by it compared with default pressure SV, and specifically include with
Lower situation：
(a) when loine pressure PV is less than default pressure SV, control assembly is controlled by increasing frequency converter output frequency f
System improves the running frequency of supply-water pump, and when frequency converter output frequency f is less than default peak frequency fmaxWhen, jump to (2)
Step；When frequency converter output frequency f is equal to or more than default peak frequency fmaxWhen, current supply-water pump is controlled by converting operation
Power frequency operation is changed to, meanwhile, a water pump conveying branch road is increased, and jump to (2) step；
(b) when loine pressure PV is equal to default pressure SV, control assembly maintains frequency converter output frequency f controls steady
Determine the running frequency of supply-water pump；
(c) when loine pressure PV exceedes default pressure SV, control assembly is controlled by reducing frequency converter output frequency f
System reduces the running frequency of supply-water pump, and when frequency converter output frequency f is more than default minimum frequency fminWhen, jump to (2)
Step；When frequency converter output frequency f is less than or equal to default minimum frequency fminWhen, control the supply-water pump of current converting operation
Stop, meanwhile, the supply-water pump of a former power frequency operation is switched into converting operation, and jump to (2) step.
At work, when EPP forming machine cooling water requirements fluctuate in smaller range, system will be according to cooling system by the present invention
Unite real-time variations in line pressure, adjusted by pid control algorithm to enter Mobile state to the output frequency of frequency converter, supply-water pump turns
Speed also changes therewith, makes the pressure remained steady of EPP cooling systems；When EPP cooling water requirements increase suddenly, EPP cooling systems
The loine pressure of system is obviously reduced, and at this moment, the cooling water in diaphragm-type air-compressed tank is in the presence of air bag rapidly to cooling system
System moisturizing, while PID regulator will improve frequency converter output frequency according to operation result, improve motor speed, increase cooling system
System water supply pump delivery, when frequency converter output frequency reaches the maximum upper limit frequency of setting, PID regulator transports current frequency conversion
Capable supply-water pump is changed to power frequency operation, while increases the supply-water pump of a converting operation, uses EPP cooling water system pressure protections
It is stable；When EPP cooling water requirements significantly reduce, the loine pressure of EPP cooling systems is stable near setting value, at this moment, every
Membrane type air pressure tank starts water storage in the presence of cooling water, while PID regulator will reduce frequency converter according to operation result and export
Frequency, motor speed is reduced, reduce cooling system water supply pump delivery, when frequency converter output frequency reaches the irreducible minimum frequency of setting
During rate, PID regulator stops the supply-water pump of current converting operation, while the supply-water pump of another power frequency operation is switched into change
Frequency running status, make EPP cooling water systems pressure protection stable.
Compared with prior art, the present invention has advantages below：
(1) in intelligent EPP constant pressure water supply systems three supply-water pumps according to produce reality situation automatic cycle work in turn
Make, compared with the constant-voltage system of usual a preparation and a use, the run time of each water pump is more balanced.
(2) in intelligent EPP constant pressure water supply systems, controller determines the water pump that puts into operation automatically according to the condition of production
Quantity, without the artificial intelligent control for participating in, realizing EPP constant pressure water supplies.
(3) in intelligent EPP constant pressure water supply systems each supply-water pump have manually, automatically control selection function, be
Unite in running, any water pump can be put into and be cut off operation operation, be easy to the maintenance of follow-up system.
Brief description of the drawings
Fig. 1 is the intelligent EPP constant pressure water supply systems pipeline structure schematic diagram of the present invention；
Fig. 2 is the control schematic diagram of the intelligent EPP constant pressure water supply systems of the present invention；
Fig. 3 is the control flow schematic diagram of the intelligent EPP constant pressure water supply systems of the present invention；
Fig. 4 is the structural representation of the diaphragm-type air-compressed tank of the present invention；
Fig. 5 is the structural representation of the dual-seal of the diaphragm-type air-compressed tank of the present invention；
In figure, 1- ponds, 2- water tanks, 3- supply-water pumps, 4- butterfly valves, 5- check-valves, 6- pressure sensors, 7- diaphragm type gas
Press tank, 71- tank bodies, 72- gall-bladders, 73- liquid entrances, 74- inflation units, 741- steel lids, 742- steel seats, 743- charging connectors
Seat, 744- sealing gaskets, 8-EPP forming machines, 9-PID adjusters, 10- frequency converters, 11- frequency conversion contactors, 12- power frequency contactors,
13- motors.
Embodiment
The present invention is described in detail with specific embodiment below in conjunction with the accompanying drawings.
Embodiment 1
A kind of intelligent EPP constant pressure water supply systems, its structure is as shown in figure 1, the water storage including being sequentially connected by pipeline
Tank 2, pump tube component and EPP forming machines 8, pressure biography is additionally provided with pipeline between pump tube component and EPP forming machines 8
Sensor 6, pump tube component include the three water pumps conveying branch road being arranged in parallel, include control pipe on every water pump conveying branch road
The valve group and supply-water pump 3 that road is opened or closed, water system also include control assembly, and the control assembly connects pressure biography respectively
Sensor 6, supply-water pump 3 and valve group.Valve group includes being separately positioned on two butterfly valves 4 at the both ends of supply-water pump 3, close to EPP into
Check-valves 5 is additionally provided between the butterfly valve 4 and supply-water pump 3 of type machine 8.One is also drawn between pressure sensor 6 and EPP forming machines 8
Branch road is buffered, diaphragm-type air-compressed tank 7 is provided with buffering branch road.
As shown in Fig. 2 control assembly includes PID regulator 9, frequency converter 10, frequency conversion contactor 11, the and of power frequency contactor 12
Power supply, PID regulator 9 connect and received the pressure signal that the pressure sensor 6 feeds back, and export corresponding Regulate signal to change
Frequency device 10, power supply draw two branch roads, wherein one is sequentially connected frequency converter 10 and frequency conversion contactor 11, another is directly connected to
Power frequency contactor 12, each frequency conversion contactor 11 corresponds to a power frequency contactor 12 combines and connects one water supply of control
The motor 13 of pump 3 is run.
The control method of intelligent EPP constant pressure water supply systems, as shown in figure 3, comprising the following steps：
(1) system starts automatic running；
(2) pressure sensor 6 monitors manages between the pump tube module outlet under current opening and EPP forming machines 8
The loine pressure PV on road, and feed back to control assembly, by control assembly by it compared with default pressure SV, and including following
Situation：
(a) when loine pressure PV is less than default pressure SV, control assembly is by increasing the output frequency f of frequency converter 10
Control improves the running frequency of supply-water pump 3, and when the output frequency f of frequency converter 10 is less than default peak frequency fmaxWhen, jump to
(2) step；When the output frequency f of frequency converter 10 is equal to or more than default peak frequency fmaxWhen, control current supply-water pump 3 by
Converting operation is changed to power frequency operation, meanwhile, a water pump conveying branch road is increased, and jump to (2) step；
(b) when loine pressure PV is equal to default pressure SV, control assembly maintains the output frequency f of frequency converter 10 controls
The running frequency of stable water supply pump 3；
(c) when loine pressure PV exceedes default pressure SV, control assembly is by reducing the output frequency f of frequency converter 10
Control reduces the running frequency of supply-water pump 3, and when the output frequency f of frequency converter 10 is more than default minimum frequency fminWhen, jump to
(2) step；When the output frequency f of frequency converter 10 is less than or equal to default minimum frequency fminWhen, control current converting operation
Supply-water pump 3 stops, meanwhile, the supply-water pump 3 of a former power frequency operation is switched into converting operation, and jump to (2) step.
Embodiment 2
On the basis of embodiment 1, the present embodiment is also further set：Water tank 2 is also connected outside by draw water pipeline
Pond 1, the dischargeable capacity of water tank 2 is more than more than 2 times of draw water pipeline volume, while is additionally provided with the inwall of the water tank 2
Level sensor, water pump described in the level sensor also feedback control.
Embodiment 3
On the basis of embodiment 1, the present embodiment is also further set：
Pressure sensor 6 includes two pressure gauges being successively set on the outlet pipeline of pump tube component, wherein one
Individual is distance-transmission pressure gauge, and another is superpressure preventing power table, control assembly described in described two equal feedback links of pressure gauge.
Embodiment 4
On the basis of embodiment 1, the present embodiment is also further set：
The structure of diaphragm-type air-compressed tank 7 is as shown in figure 4, including tank body 71, the inside of tank body 71 is provided with full courage formula gall-bladder 72, tank
The top of body 71 is connected with inflation unit 74 by flange, and inflation unit 74 is connected by gas tube with gall-bladder 72, under tank body 71
Side is provided with the liquid entrance 73 of pipeline between access pump tube component and EPP forming machines 8.Inflation unit 74 includes being arranged on
Steel seat 742 on flange, it is arranged on the top of steel seat 742 and is secured to the steel lid 741 of connection, and is arranged on steel seat 742
And the charging connector seat 743 of the gall-bladder 72 is connected, between the steel lid 741 and steel seat 742, steel seat 742 and charging connector seat 743
Sealed using sealing gasket 744, and form double sealing structure, as shown in Figure 5.
The above-mentioned description to embodiment is understood that for ease of those skilled in the art and using invention.
Person skilled in the art obviously can easily make various modifications to these embodiments, and described herein general
Principle is applied in other embodiment without by performing creative labour.Therefore, the invention is not restricted to above-described embodiment, ability
Field technique personnel do not depart from improvement that scope made and modification all should be the present invention's according to the announcement of the present invention
Within protection domain.
Claims (10)
1. a kind of intelligent EPP constant pressure water supply systems, it is characterised in that including water tank, the water pump being sequentially connected by pipeline
Pipeline assembly and EPP forming machines, pressure sensor is additionally provided with pipeline between pump tube component and EPP forming machines, it is described
Pump tube component include the multiple water pumps conveying branch road being arranged in parallel, is opened on every water pump conveying branch road including control piper
Valve group and supply-water pump, described water system logical or close also include control assembly, and the control assembly connects pressure respectively
Sensor, supply-water pump and valve group.
A kind of 2. intelligent EPP constant pressure water supply systems according to claim 1, it is characterised in that described control assembly
Including PID regulator, frequency converter, frequency conversion contactor, power frequency contactor and power supply, described PID regulator connects and receives institute
The pressure signal of pressure sensor feedback is stated, and exports corresponding Regulate signal and draws two branch roads to frequency converter, described power supply,
Wherein one is sequentially connected frequency converter and frequency conversion contactor, and another is directly connected to power frequency contactor, each frequency conversion contactor
All with a power frequency contactor it is corresponding combine and connect control one supply-water pump motor operation.
A kind of 3. intelligent EPP constant pressure water supply systems according to claim 1, it is characterised in that described pressure sensing
A buffering branch road is also drawn between device and EPP forming machines, diaphragm-type air-compressed tank is provided with buffering branch road.
A kind of 4. intelligent EPP constant pressure water supply systems according to claim 3, it is characterised in that described diaphragm type gas
Pressure tank includes tank body, and tank interior is provided with full courage formula gall-bladder, and tank body top is connected with inflation unit by flange, and inflation unit is led to
Overcharge tracheae with gall-bladder to be connected, the liquid that pipeline between access pump tube component and EPP forming machines is provided with below tank body enters
Outlet.
A kind of 5. intelligent EPP constant pressure water supply systems according to claim 4, it is characterised in that described inflation unit
Including the steel seat being arranged on flange, the steel lid for being arranged on above steel seat and being secured to connection, and it is arranged on steel seat simultaneously
The charging connector seat of the gall-bladder is connected, is sealed between the steel lid and steel seat, steel seat and charging connector seat using sealing gasket, and group
Into double sealing structure.
A kind of 6. intelligent EPP constant pressure water supply systems according to claim 1, it is characterised in that described water pump conveying
Branch road is provided with three.
A kind of 7. intelligent EPP constant pressure water supply systems according to claim 1, it is characterised in that described valve group bag
Two butterfly valves for being separately positioned on supply-water pump both ends are included, non-return is additionally provided between the butterfly valve and supply-water pump close to EPP forming machines
Valve.
8. a kind of intelligent EPP constant pressure water supply systems according to claim 1, it is characterised in that described water tank is also
Outside pond is connected by draw water pipeline, the dischargeable capacity of water tank is more than more than 2 times of draw water pipeline volume, while the storage
Level sensor is additionally provided with water pot inwall, suction pump of the level sensor also in feedback control draw water pipeline.
A kind of 9. intelligent EPP constant pressure water supply systems according to claim 1, it is characterised in that described pressure sensing
Device includes two pressure gauges being successively set on the outlet pipeline of pump tube component, and one of them is distance-transmission pressure gauge, separately
One is superpressure preventing power table, control assembly described in described two equal feedback links of pressure gauge.
10. the control method of the intelligent EPP constant pressure water supply systems as described in claim 1-9 is any, it is characterised in that specific
Comprise the following steps：
(1) system starts automatic running；
(2) between the pump tube module outlet and EPP forming machines under the current opening of pressure sensor monitoring pipeline pipe
Road pressure PV, and feed back to control assembly, by control assembly by it compared with default pressure SV, and specifically include following feelings
Condition：
(a) when loine pressure PV is less than default pressure SV, control assembly is carried by increasing frequency converter output frequency f controls
The running frequency of high supply-water pump, and when frequency converter output frequency f is less than default peak frequency fmaxWhen, jump to (2) step；
When frequency converter output frequency f is equal to or more than default peak frequency fmaxWhen, control current supply-water pump to be changed to by converting operation
Power frequency operation, meanwhile, a water pump conveying branch road is increased, and jump to (2) step；
(b) when loine pressure PV is equal to default pressure SV, control assembly maintains frequency converter output frequency f controls are stable to supply
The running frequency of water pump；
(c) when loine pressure PV exceedes default pressure SV, control assembly is by reducing frequency converter output frequency f control drops
The running frequency of low supply-water pump, and when frequency converter output frequency f is more than default minimum frequency fminWhen, jump to (2) step；
When frequency converter output frequency f is less than or equal to default minimum frequency fminWhen, control the supply-water pump of current converting operation to stop
Only, meanwhile, the supply-water pump of a former power frequency operation is switched into converting operation, and jump to (2) step.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110953169A (en) * | 2019-12-03 | 2020-04-03 | 温州大学 | A control method of a parallel variable frequency constant voltage control system |
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| CN201794121U (en) * | 2010-09-07 | 2011-04-13 | 河北保定太行集团有限责任公司 | Membrane type air pressure tank |
| CN104074239A (en) * | 2014-07-02 | 2014-10-01 | 合肥迈特机械科技有限公司 | Full-automatic variable-frequency constant-pressure water supply system and control method thereof |
| CN104563212A (en) * | 2014-07-22 | 2015-04-29 | 上海大众祥源动力供应有限公司 | Variable-frequency constant-pressure make-up water control system on basis of PI (Proportional-Integral) regulation |
| CN205205908U (en) * | 2015-12-03 | 2016-05-04 | 漯河恒义达电气设备有限公司 | Variable -frequency and constant -pressure water supply system |
| CN205907760U (en) * | 2016-07-20 | 2017-01-25 | 南方中金环境股份有限公司 | Multistage jar of body pipe network pressure -superposed water supply equipment on III types of NFWG |
| CN207419603U (en) * | 2017-08-31 | 2018-05-29 | 上海子元汽车零部件有限公司 | A kind of intelligent EPP constant pressure water supply systems |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110953169A (en) * | 2019-12-03 | 2020-04-03 | 温州大学 | A control method of a parallel variable frequency constant voltage control system |
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Application publication date: 20171110 |