CN205276388U - Variable -frequency and constant -pressure water supply system - Google Patents
Variable -frequency and constant -pressure water supply system Download PDFInfo
- Publication number
- CN205276388U CN205276388U CN201521054099.XU CN201521054099U CN205276388U CN 205276388 U CN205276388 U CN 205276388U CN 201521054099 U CN201521054099 U CN 201521054099U CN 205276388 U CN205276388 U CN 205276388U
- Authority
- CN
- China
- Prior art keywords
- converter
- frequency
- constant
- water supply
- circuit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Abstract
The utility model discloses a variable -frequency and constant -pressure water supply system, including constant voltage control ware, converter, water pump, pressure sensor, the signal that the constant voltage control ware was accepted to the converter carries out speed control to the water pump, and the pressure sensor pipe network goes out the water pressure, transferes the constant voltage control ware to the signal, and the rotational speed of control pump is come to the frequency of rethread PID operation regulation converter, forms a closed loop control system. This variable -frequency and constant -pressure water supply system can realize the 20% -40% that economizes on electricity, and the configuration is nimble, and degree of automation is high, and is multiple functional, and is nimble reliable, but eliminate water hammers the effect into shape, can reduce the wearing and tearing and average moment of torsion of motor in addition to reduce the maintenance cost and improve the water pump life -span, reduce original water supply mode's secondary pollution, can pass through remote control, can realize unmanned on duty, the material resources of using manpower sparingly.
Description
Technical field
This utility model relates to supply equipment remote control technology field, especially a kind of constant pressure water supply Intelligence Remote Controller.
Background technology
Along with Chinese society expanding economy, deepening continuously of housing reform, improving constantly of people's living standard, in city, all kinds of housing estate developments development is very rapid, and the infrastructure construction of Ye Dui community simultaneously is had higher requirement. The construction of community water system is one of them importance, and the reliability of water supply, stability, economy directly influence normal operation and the life of neighbours living, also directly represent the level of Property Management of residence height. Tradition regulates the mode of pressure of supply water, the modes adopting the control of frequent start-stop motor, water tower secondary water-supply to regulate more, and the former produces substantial amounts of energy consumption, and other loads in electrical network are impacted, and the continuous start and stop of equipment can affect equipment life; The latter then needs substantial amounts of occupation of land and investment. And due to secondary water-supply, it is impossible to ensure the safety for water quality and reliability. And the operation of frequency control is sufficiently stable reliably, it does not have start and stop phenomenon frequently, Starting mode is soft start, and equipment runs very steady, it is to avoid electrically, mechanical shock, also without the danger of the secondary pollution that water tower water-feeding brings.
Currently, adopting the rotating speed of Frequency Converter Control water pump, the closed loop adjustment of water pipe ductwork pressure and the loop control of multiple stage water pump in constant pressure water supply technology, some employing Programmable Logic Controllers (PLC) realize; Some employing single-chip microcomputers and corresponding software realize. Both control programs, from reliability aspect, PLC is better than single-chip microcomputer; From economy aspect, single-chip microcomputer is better than PLC. On the frequency conversion handoff technique with power frequency supply, most methods adopting main circuit concatenation soft initiator carry out reduced-voltage starting, also have the control pulse of block converter when adopting switching, make converter be output as zero, be switched on power frequency supply. In both approaches, adopting the method for main circuit concatenation soft initiator to carry out reduced-voltage starting and easily realize, soft initiator is generally component end item, but equipment investment is bigger; The latter adopts the control pulsing unit small investment of block converter during switching, but frequency fluctuation is big, easily causes water pipe ductwork pressure unstable.
Current converter mostly is universal and unit control i.e. converter one motor of dragging, and function is mainly limited to FREQUENCY CONTROL, rotating control, control for brake, voltage-frequency than controlling and various defencive function. It is applied in, in jumbo constant pressure water supply system, during in order to meet output size requirement difference, it is ensured that water pipe ductwork pressure is constant, pressure closed loop need to be provided outside converter to regulate; The loop control of many days water pumps needs outside offer logic control; On the frequency conversion handoff technique with power frequency supply, the method mostly adopting main circuit concatenation soft initiator reduced-voltage starting. The eighties enters the Japanese Samco of Chinese market mid-term and supplies water, and is proposed exclusive constant pressure water supply substrate. It by the hardware integration such as PID regulator and PLC on Frequency Converter Control substrate, the function of the electric-control systems such as PLC and PID is realized by arranging instruction code, have only to carry supporting constant pressure water supply unit, just can directly control multiple built-in electromagnetic contactor work, may make up the water system of maximum 7 electric-motor pumps. This equipment simplifies circuit structure and real work amount, improves the reliability of system, reduces cost. Domestic also release constant pressure water supply special converter such as Ai Mosheng and Sen Lan converter etc., it is not necessary to external PLC and PID controller, the cyclic switching of maximum 4 water pumps, timing start-stop, timing cycle can be completed. But operation does not have data communication function, can only be only applicable to low capacity, control less demanding water supply occasion.
The current forward of frequency-conversion water supply system is integrated, attended operation is simplified direction and developed. At home and abroad, the system integration being specifically designed for water supply is more and more higher, a lot of special integrated PLC or PID of constant pressure water supply controller. Attended operation is more and more simpler simultaneously. At present, substantially the computer optimization of water system is achieved in some city on the ground such as the U.S., Japan, France, direct to variable frequency water supply and computer management and running are combined, can realize adopting smart mobile phone, computer check and control the operating of constant pressure water supply system by network.
Summary of the invention
Goal of the invention of the present utility model is, overcomes the deficiency of art methods, it is provided that one can realize economize on electricity 20%-40%, flexible configuration, and automaticity is high, multiple functional, flexibility and reliability; Can eliminate water hammer effect, and abrasion and the average torque of motor can be reduced, thus reducing maintenance cost and improving the water pump life-span; Decrease the secondary pollution of original way of supplying water, it is possible to by long-range control, it is possible to achieve unmanned, a kind of constant pressure water supply system used manpower and material resources sparingly.
For achieving the above object, it is proposed that following technical scheme:
A kind of constant pressure water supply system, including constant-voltage controller, converter, water pump, pressure transducer; Described converter accepts the signal of constant-voltage controller and water pump is carried out speed controlling, pressure transducer detection pipe network discharge pressure, signal is passed to constant-voltage controller, and the frequency regulating converter again through PID arithmetic controls the rotating speed of water pump, forms a closed-loop control system.
The work process of described constant pressure water supply system: the hydraulic pressure value in pipeline is transformed into current signal (4 ~ 20mA) or distance-transmission pressure gauge signal (1 ~ 5V) by pressure transducer, send into constant-voltage controller, warp compares with pressure set points, PID arithmetic, go to control the output frequency size of converter, thus controlling the rotating speed of motor. Control the switching between common frequency power network and frequency conversion export of four water pumps by constant-voltage controller, change operating condition and the rotating speed of 4 water pumps, it is achieved be automatically adjusted closed-loop control system with the constant pressure water supply that setup pressure value is benchmark.
Described constant pressure water supply system is by four water pumps of a Frequency Converter Control; When after system start-up, First water pump brings into operation from 0Hz with frequency conversion, if to pressure after 50Hz still less than setting pressure, switching to power frequency operation, next water pump of variable frequency starting brings into operation from 0Hz simultaneously; If also not up to setup pressure value after running to 50Hz, it is switched to again power frequency operation, starts next water pump simultaneously; As pressure exceed setting value then system then can frequency reducing or subtract pump, arrive constant pressure in setting value with this. After during useless water, pressure reaches setting value, system can automatically into resting state, and when there being people's water, system can be revived automatically.
Described constant pressure water supply system is by one pump working of a Frequency Converter Control, and described converter is ACI converter; System includes ACI converter, water pump, pressure transducer; Described ACI converter accepts water pump is carried out speed controlling, pressure transducer detection pipe network discharge pressure, signal is passed to ACI converter, controls the rotating speed of water pump again through the frequency changing ACI converter, form a closed-loop control system. ACI converter itself has PID regulatory function, can not also select external constant-voltage controller when one-to-one, regulates more steady.
Described constant-voltage controller includes central processing unit, power circuit, button display circuit, reset circuit, clock circuit, telecommunication circuit, simulated measurement input circuit, outputting circuit for relay and protection input circuit; Common AC-input voltage is undertaken processing acquisition constant-voltage controller working power by described power circuit by rectification, filtering, inversion; Described telecommunication circuit is for the input and output of control signal; Described simulated measurement input circuit is for the transmission of pressure signal; Described outputting circuit for relay is used for connecting the output of power frequency frequency conversion relay.
Described outputting circuit for relay is 8 tunnel power frequency VFC relay outputs, for the control mode of four water pumps of a Frequency Converter Control; Described protection input circuit is No. 1 power transfer relay output, reports to the police for external fault, and No. 4 water pump overload protection detection On-off signal, for connecing the protection output signal of thermorelay; 1 road water level detection switch amount input; Described simulated measurement input circuit is two-way analog input AI(4 ~ 20mA)/VI(1-5V), detect for pressure signal; The outside on off control On-off signal in 2 tunnels; Telecommunication circuit includes RS485 communication interface, connects converter, controls the operation of converter; RJ45 network interface, connects network, remotely controls. Constant pressure water supply Intelligence Remote Controller, converter, PC, wireless network terminal, switch board, water supply network and pump equipment form a set of frequency-changing pressure stabilizing intelligent remote Control management system. The operation transition of water system can be checked by smart mobile phone, panel computer, PC, it is also possible to control the start and stop of water system, setup pressure value, amendment parameter etc., so greatly reduce employment cost and solve the time of fault.
The beneficial effect of this utility model:
Constant pressure water supply system of the present utility model has the advantage that 1, energy-efficient; 2, constant pressure water supply (achieve that systematic Water supply pressure is stable and flow can on a large scale consecutive variations, thereby may be ensured that and user's whenever use water pressure not appear in the situation that water use peak phase water heater can not normally use); 3, safety and sanitation; System realizes after closed loop supplies water, and the water of user is all directly fed by pipeline, eliminate the facilities such as water tower, terrace pond, air pressure tank, it is to avoid with " secondary pollution " of water, eliminate pond periodic cleaning work; 4, automatically run, manage simplicity; Perfect in shape and function, automatically controls, automatic start-stop, and pump house can be posted a sentry position, it is possible to remotely controls, and only need to make regular check on, maintain; 5, the extension device life-span, protection the stabilization of power grids; Using after converter, the rotating speed of water pump is no longer that long term maintenance rated speed is run, and decreases mechanical wear, reduces fault of water pump rate, and main pump rotation controls to run, it is ensured that each pump balanced running stainless four, extends water pump service life. The stepless time adjustment of converter runs, it is achieved that water pump soft start, it is to avoid the impact to motor coil and electrical network of big electric current during motor start-stop, and can eliminate the water hammer effect of water pump; 6, occupation of land, small investment.
Accompanying drawing explanation
Fig. 1 is constant pressure water supply system main circuit connection figure;
Fig. 2 is constant pressure water supply system control block figure
Fig. 3 is intelligent controller principle block diagram;
Fig. 4 is intelligent controller wiring diagram.
Detailed description of the invention
Below in conjunction with accompanying drawing, a kind of constant pressure water supply system of the present utility model is further described in detail:
As it is shown in figure 1, a kind of constant pressure water supply system, including constant-voltage controller, converter, water pump, pressure transducer; Described converter accepts the signal of constant-voltage controller and water pump is carried out speed controlling, pressure transducer detection pipe network discharge pressure, signal is passed to constant-voltage controller, and the frequency regulating converter again through PID arithmetic controls the rotating speed of water pump, forms a closed-loop control system.
As shown in Figure 2, the work process of described constant pressure water supply system: the hydraulic pressure value in pipeline is transformed into current signal (4 ~ 20mA) or distance-transmission pressure gauge signal (1 ~ 5V) by pressure transducer, send into constant-voltage controller, warp compares with pressure set points, PID arithmetic, go to control the output frequency size of converter, thus controlling the rotating speed of motor. Control the switching between common frequency power network and frequency conversion export of four water pumps by constant-voltage controller, change operating condition and the rotating speed of 4 water pumps, it is achieved be automatically adjusted closed-loop control system with the constant pressure water supply that setup pressure value is benchmark.
Described constant pressure water supply system is by four water pumps of a Frequency Converter Control; When after system start-up, First water pump brings into operation from 0Hz with frequency conversion, if to pressure after 50Hz still less than setting pressure, switching to power frequency operation, next water pump of variable frequency starting brings into operation from 0Hz simultaneously; If also not up to setup pressure value after running to 50Hz, it is switched to again power frequency operation, starts next water pump simultaneously; As pressure exceed setting value then system then can frequency reducing or subtract pump, arrive constant pressure in setting value with this. After during useless water, pressure reaches setting value, system can automatically into resting state, and when there being people's water, system can be revived automatically.
Constant-voltage controller one drags four circulation variable frequency work processes: during system starts, the pump number 2(first set by inverter start up as: b1.02=2) run, after full frequency is run in frequency conversion, continue T1(and increase pump time delay b1.04) time, when pressure still is below increasing pump pressure (b1.03), then stop No. 2 pump frequency conversions (free parking), simultaneously switch off I2 relay, time delay T2(becomes the time delay b1.07 that changes a job) No. 2 pumps are switched to power frequency operation (i.e. Guan Bi C2 relay), then time delay T3(work changes time delay b1.08) time, No. 3 pumps of inverter start up (i.e. Guan Bi I3 relay, control setpoint frequency according to PID to bring into operation startup from 0Hz to converter), water system is in the running status of " 1 work 1 becomes ".
When 3# pump runs to again full frequency, time delay T1(increases pump time delay) pressure be still below increase pump pressure time, then stop No. 3 pump frequency conversions (free parking), simultaneously switch off I2 relay, time delay T2(becomes time delay of changing a job) No. 3 pumps are switched to power frequency operation (i.e. Guan Bi C2 relay), then time delay T3(work changes time delay) No. 4 pumps of inverter start up (i.e. Guan Bi I4 relay, control setpoint frequency according to PID to bring into operation startup from 0Hz to converter), make water system be in the running status of " 2 works 1 become ".
When 4# pump runs to again full frequency, time delay T1(increases pump time delay), when pressure is still below increasing pump pressure, then stop No. 4 pump frequency conversions (free parking), simultaneously switch off I2 relay, time delay T2(becomes time delay of changing a job) No. 4 pumps are switched to power frequency operation (i.e. Guan Bi C2 relay), then time delay T3(work changes time delay) No. 1 pump of inverter start up (i.e. Guan Bi I1 relay, control setpoint frequency according to PID to bring into operation startup from 0Hz to converter), make water system be in the running status of " 3 works 1 become ".
If the operating frequency of converter has been reduced to subtract pump frequency (b1.05), continue T4(and subtract pump time delay b1.06) time, frequency is also less than subtracting pump frequency, then No. 2 pump power frequencies of excision (namely disconnecting C2 relay), makes water system be in the running status of " 2 works 1 become ".
If the operating frequency of converter still is below subtracting pump frequency, then time delay T4(subtracts pump time delay) excise No. 3 pump power frequencies (disconnecting C3 relay), make water system be in the running status of " 1 work 1 becomes ".
If the operating frequency of converter still is below subtracting pump frequency, then time delay T4(subtracts pump time delay) excise No. 4 pump power frequencies (disconnecting C4 relay), make water system be in the running status of " 1 becomes ". Now only have converter directly to drive a pump frequency conversion to run, make the pressure of water supply network keep constant.
When nobody uses water, converter operating frequency drops to sleep lower frequency limit, then time delay T5(sleep time delay b0.09), stop converting operation output, converter enters sleep state.
When water outlet side pressure: P(actual pressure value) <b0.01 (setup pressure value)-b0.12(revives deviation value), converter is restarted.
Above procedure loop cycle.
Described constant pressure water supply system is by one pump working of a Frequency Converter Control, and described converter is ACI converter; System includes ACI converter, water pump, pressure transducer; Described ACI converter accepts water pump is carried out speed controlling, pressure transducer detection pipe network discharge pressure, signal is passed to ACI converter, controls the rotating speed of water pump again through the frequency changing ACI converter, form a closed-loop control system. ACI converter itself has PID regulatory function, can not also select external constant-voltage controller when one-to-one, regulates more steady.
As shown in Figure 3,4, described constant-voltage controller includes central processing unit, power circuit, button display circuit, reset circuit, clock circuit, telecommunication circuit, simulated measurement input circuit, outputting circuit for relay and protection input circuit; Common AC-input voltage is undertaken processing acquisition constant-voltage controller working power by described power circuit by rectification, filtering, inversion; Described telecommunication circuit is for the input and output of control signal; Described simulated measurement input circuit is for the transmission of pressure signal; Described outputting circuit for relay is used for connecting the output of power frequency frequency conversion relay.
Described outputting circuit for relay is 8 tunnel power frequency VFC relay outputs, for the control mode of four water pumps of a Frequency Converter Control; Described protection input circuit is No. 1 power transfer relay output, reports to the police for external fault, and No. 4 water pump overload protection detection On-off signal, for connecing the protection output signal of thermorelay; 1 road water level detection switch amount input; Described simulated measurement input circuit is two-way analog input AI(4 ~ 20mA)/VI(1-5V), detect for pressure signal; The outside on off control On-off signal in 2 tunnels; Telecommunication circuit includes RS485 communication interface, connects converter, controls the operation of converter; RJ45 network interface, connects network, remotely controls. Constant pressure water supply Intelligence Remote Controller, converter, PC, wireless network terminal, switch board, water supply network and pump equipment form a set of frequency-changing pressure stabilizing intelligent remote Control management system. The operation transition of water system can be checked by smart mobile phone, panel computer, PC, it is also possible to control the start and stop of water system, setup pressure value, amendment parameter etc., so greatly reduce employment cost and solve the time of fault.
Claims (7)
1. a constant pressure water supply system, it is characterised in that include constant-voltage controller, converter, water pump, pressure transducer; Described converter accepts the signal of constant-voltage controller and water pump is carried out speed controlling, pressure transducer detection pipe network discharge pressure, signal is passed to constant-voltage controller, and the frequency regulating converter again through PID arithmetic controls the rotating speed of water pump, forms a closed-loop control system.
2. a kind of constant pressure water supply system according to claim 1, it is characterised in that described constant pressure water supply system is by four water pumps of a Frequency Converter Control.
3. a kind of constant pressure water supply system according to claim 1, it is characterised in that described constant pressure water supply system is by one pump working of a Frequency Converter Control, and described converter is ACI converter; System includes ACI converter, water pump, pressure transducer; Described ACI converter accepts water pump is carried out speed controlling, pressure transducer detection pipe network discharge pressure, signal is passed to ACI converter, controls the rotating speed of water pump again through the frequency changing ACI converter, form a closed-loop control system.
4. a kind of constant pressure water supply system according to claim 1, it is characterized in that, described constant-voltage controller includes central processing unit, power circuit, button display circuit, reset circuit, clock circuit, telecommunication circuit, simulated measurement input circuit, outputting circuit for relay and protection input circuit; Common AC-input voltage is undertaken processing acquisition constant-voltage controller working power by described power circuit by rectification, filtering, inversion; Described telecommunication circuit is for the input and output of control signal; Described simulated measurement input circuit is for the transmission of pressure signal; Described outputting circuit for relay is used for connecting the output of power frequency frequency conversion relay.
5. a kind of constant pressure water supply system according to claim 4, it is characterised in that described outputting circuit for relay is 8 tunnel power frequency VFC relay outputs, for the control mode of four water pumps of a Frequency Converter Control; Described protection input circuit is No. 1 power transfer relay output, reports to the police for external fault, and No. 4 water pump overload protection detection On-off signal, for connecing the protection output signal of thermorelay.
6. a kind of constant pressure water supply system according to claim 4, it is characterised in that described simulated measurement input circuit is two-way analog input AI(4 ~ 20mA)/VI(1-5V), detect for pressure signal.
7. a kind of constant pressure water supply system according to claim 4, it is characterised in that telecommunication circuit includes RS485 communication interface, connects converter, controls the operation of converter; RJ45 network interface, connects network, remotely controls.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521054099.XU CN205276388U (en) | 2015-12-15 | 2015-12-15 | Variable -frequency and constant -pressure water supply system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521054099.XU CN205276388U (en) | 2015-12-15 | 2015-12-15 | Variable -frequency and constant -pressure water supply system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205276388U true CN205276388U (en) | 2016-06-01 |
Family
ID=56060972
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201521054099.XU Expired - Fee Related CN205276388U (en) | 2015-12-15 | 2015-12-15 | Variable -frequency and constant -pressure water supply system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205276388U (en) |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108374448A (en) * | 2018-05-08 | 2018-08-07 | 伟泰科技（无锡）有限公司 | A kind of industrial regeneration water constant pressure water supply system |
| CN108775045A (en) * | 2018-03-30 | 2018-11-09 | 天津中德应用技术大学 | A kind of constant pressure circulating water supply system based on special converter |
| CN108980022A (en) * | 2018-09-14 | 2018-12-11 | 沧州市供水排水集团有限公司 | A kind of manual apparatus for fast switching of frequency converter pump |
| CN109338088A (en) * | 2018-12-05 | 2019-02-15 | 成都福斯汽车电线有限公司 | A kind of anti-interruption system and method for annealing liquid feed flow |
| CN110284555A (en) * | 2019-06-28 | 2019-09-27 | 钟志标 | A kind of tired water system of more pumps zero and method |
| CN110514459A (en) * | 2019-06-10 | 2019-11-29 | 上海威派格智慧水务股份有限公司 | It is suitable for the fault self-checking device of wetting system |
| CN110777885A (en) * | 2019-11-11 | 2020-02-11 | 北京华夏源洁水务科技有限公司 | Secondary water supply method and system |
| CN111058511A (en) * | 2019-12-17 | 2020-04-24 | 北京交通大学 | Constant pressure water supply system |
| CN112783220A (en) * | 2020-12-30 | 2021-05-11 | 中国长江电力股份有限公司 | Water level maintaining system based on variable-frequency water level maintaining equipment and self-adaptive control method |
| CN113550883A (en) * | 2021-07-19 | 2021-10-26 | 中国工商银行股份有限公司 | Water chilling unit, control method thereof, electronic equipment and storage medium |
| CN115419578A (en) * | 2022-08-30 | 2022-12-02 | 杭州士腾科技有限公司 | Multi-water-pump communication system |
-
2015
- 2015-12-15 CN CN201521054099.XU patent/CN205276388U/en not_active Expired - Fee Related
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108775045A (en) * | 2018-03-30 | 2018-11-09 | 天津中德应用技术大学 | A kind of constant pressure circulating water supply system based on special converter |
| CN108374448A (en) * | 2018-05-08 | 2018-08-07 | 伟泰科技（无锡）有限公司 | A kind of industrial regeneration water constant pressure water supply system |
| CN108980022A (en) * | 2018-09-14 | 2018-12-11 | 沧州市供水排水集团有限公司 | A kind of manual apparatus for fast switching of frequency converter pump |
| CN109338088A (en) * | 2018-12-05 | 2019-02-15 | 成都福斯汽车电线有限公司 | A kind of anti-interruption system and method for annealing liquid feed flow |
| CN110514459A (en) * | 2019-06-10 | 2019-11-29 | 上海威派格智慧水务股份有限公司 | It is suitable for the fault self-checking device of wetting system |
| CN110284555A (en) * | 2019-06-28 | 2019-09-27 | 钟志标 | A kind of tired water system of more pumps zero and method |
| CN110777885A (en) * | 2019-11-11 | 2020-02-11 | 北京华夏源洁水务科技有限公司 | Secondary water supply method and system |
| CN111058511A (en) * | 2019-12-17 | 2020-04-24 | 北京交通大学 | Constant pressure water supply system |
| CN112783220A (en) * | 2020-12-30 | 2021-05-11 | 中国长江电力股份有限公司 | Water level maintaining system based on variable-frequency water level maintaining equipment and self-adaptive control method |
| CN112783220B (en) * | 2020-12-30 | 2023-01-13 | 中国长江电力股份有限公司 | Water level maintaining system based on variable-frequency water level maintaining equipment and self-adaptive control method |
| CN113550883A (en) * | 2021-07-19 | 2021-10-26 | 中国工商银行股份有限公司 | Water chilling unit, control method thereof, electronic equipment and storage medium |
| CN115419578A (en) * | 2022-08-30 | 2022-12-02 | 杭州士腾科技有限公司 | Multi-water-pump communication system |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN205276388U (en) | Variable -frequency and constant -pressure water supply system | |
| CN105714879B (en) | A kind of M drags the control method of the frequency-conversion control cabinet in N-type Intelligent constant-voltage water system | |
| CN201972194U (en) | Intelligent frequency-variable constant-pressure water supply system | |
| CN203849623U (en) | Constant-voltage water supply control system | |
| CN104153425A (en) | Constant-pressure water supply system | |
| CN102916640B (en) | A kind of diesel locomotive phase-control excitation control device and method thereof | |
| CN105507378A (en) | Frequency-conversion-type automatic constant-pressure water supplying system and method | |
| CN103174197A (en) | Control method and control loop for frequency conversion soft start of constant voltage circulatory water supply | |
| CN205636918U (en) | Multicomputer constant pressure water supply frequency conversion control system based on PLC | |
| CN112128107A (en) | Intelligent control system and method for air compressor | |
| CN113325794A (en) | Remote variable frequency control system based on PLC | |
| CN104852381B (en) | Portable shelter monitoring system and battery energy storage system charge/discharge control method | |
| CN110825016A (en) | Double-frequency-conversion automatic control system of non-negative-pressure water supply equipment and implementation method thereof | |
| CN201503063U (en) | Full-automatic unattended heat exchanger unit | |
| CN203243261U (en) | Frequency-conversion soft-start control loop for constant-voltage circulating water supply | |
| CN203160317U (en) | Double-closed-loop automatic constant-pressure water supply control device of parallelly-connected pipe network | |
| CN104314135A (en) | Multi-split constant-pressure water supply system | |
| CN205475474U (en) | Automatic water supply control system of inverter type constant voltage | |
| CN102561460A (en) | Intelligent variable-frequency constant-pressure water supply system | |
| CN203373810U (en) | Automatic pressure regulating and controlling device for water supply system | |
| CN101963148A (en) | Pumping termination and energy saving control method for variable frequency water supply equipment provided with PLC control cabinet | |
| CN107642485B (en) | Frequency conversion type oil-immersed pump Efficiency test method | |
| CN102383462A (en) | Frequency conversion constant-pressure water supply system | |
| CN112709284A (en) | Water supply control method for centrifugal plant | |
| CN209907491U (en) | Variable-frequency constant-pressure water supply system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee | ||
| CP03 | Change of name, title or address |
Address after: 510800, 301, 302, 305, 314, 2 and 315 shops at Yunfeng commercial building, No. Jinghu, Guangzhou Avenue, Huadu District, Guangdong, China Patentee after: Guangzhou Zhufeng Electric Co., Ltd. Address before: 510800, 3 floor, Yunfeng commercial building, No. 2, Jinghu Road, Huadu District, Guangdong, Guangzhou Patentee before: Guangzhou Zhufeng Electric Co., Ltd. |
|
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160601 Termination date: 20201215 |