CN205952272U - Cooling water frequency conversion control system of boats and ships central authorities - Google Patents
Cooling water frequency conversion control system of boats and ships central authorities Download PDFInfo
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- CN205952272U CN205952272U CN201620878787.6U CN201620878787U CN205952272U CN 205952272 U CN205952272 U CN 205952272U CN 201620878787 U CN201620878787 U CN 201620878787U CN 205952272 U CN205952272 U CN 205952272U
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- control system
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- outfan
- temperature
- pid
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Abstract
The utility model discloses a cooling water frequency conversion control system of boats and ships central authorities, including two sets of PID governing system, three -way valve exit temperature PID control system and be the variable structure sea water pump control system of core based on PID promptly. The utility model relates to a rationally, adopting the variable structure control system who be the core based on tandem PID, setting up two sets of PID governing system, the two sets of systems are autonomous working interrelated again separately, and any one set when breaking down, another cover can the autonomous working, assurance navigation safety. Increase heat transfer area improves heat exchange efficiency to greatly reduced frequency conversion sea water pump speed realizes energy -saving control.
Description
Technical field
This utility model is related to a kind of ship central cooling water control system, specifically a kind of ship central authorities' cooling water frequency conversion
Control system.
Background technology
Ship water cooling system is to ensure that one of dynamical system of Ship Power Equipment safe and reliable operation, its effect be to
The equipment needing cooling provides enough cooling waters, to take away the heat that equipment gives out, enables a device in certain temperature
In the range of normal reliable work.
In order to ensure the needs of ship whole world navigation, the design conditions of conventional central cooling system are ship at tropical 32 DEG C
Waters is under full steam.But practical situation is, the one side ship most of the time is navigation, the opposing party in the marine site less than 32 DEG C
Face ship is in the economical speed under main frame normal power point again mostly.When not adopting frequency control, main sea water pump exists for a long time
Run beyond under the power being actually needed, cause mass energy to waste, and shorten service life.Therefore design according to ship
The control system of the working conditions change real-time regulation sea water pump discharge of oceangoing ship is imperative.
Utility model content
The purpose of this utility model is to provide a kind of ship central authorities cooling water frequency-changing control system, to solve above-mentioned background
The problem proposing in technology.
For achieving the above object, this utility model provides following technical scheme：
A kind of ship central authorities cooling water frequency-changing control system, including two sets of PID regulating systems, i.e. three-way valve outlet temperature
PID control system and based on PID for core structure changes sea water pump control system, described based on PID for core structure changes sea
Control system of water pump includes master selector, secondary controller, converter, heat exchanger, flow transmitter and temperature transmitter, described master
The outfan of actuator connects the input of secondary controller, and the outfan of secondary controller connects the input of converter, secondary regulation
It is provided with electronics automatic transfer switch, described electronics automatic transfer switch is that one kind is flexible coupling, controller root between device and converter
Switch over according to three-way valve cold water aperture, electronics automatic transfer switch is ± 2% hysteresis comparator；The outfan of converter connects
The input of sea water frequency conversion pump motor；Electronics automatic transfer switch passes through wire and secondary controller and piecewise function generator respectively
Connect；The outfan of converter connects the input of seawater flow actuator, and the outfan of seawater flow actuator connects heat exchange
The input of device, the wire between seawater flow actuator and heat exchanger is connected with flow transmitter one end, the transmitter other end
It is connected by the wire between wire and master selector and secondary controller；The outfan of heat exchanger connects the input of temperature transmitter
End, the outfan of temperature transmitter connects the input of master selector.
As further program of the utility model：Master controller in described three-way valve outlet temperature PID control system
Outfan connects the input of temperature control three-way valve, and the outfan of temperature control three-way valve connects the input of thermometer for fresh water outlet, light
The outfan of water outlet temperature meter connects the input of temperature transmitter, and the outfan of temperature transmitter connects the defeated of master controller
Enter end.
Compared with prior art, the beneficial effects of the utility model are：This utility model is reasonable in design, using based on tandem
PID is the variable structure control system of core, sets up two sets of PID regulating systems, and two sets of systems each work independently and interrelated,
Any a set of when breaking down, another set of can work independently it is ensured that navigation safety.Increase heat exchange area, improve heat exchange
Efficiency, thus substantially reduce frequency conversion sea water pump velocity interpolation Energy Saving Control.
Brief description
Fig. 1 is the theory diagram based on PID for the structure changes sea water pump control system of core.
Fig. 2 is the theory diagram of three-way valve outlet temperature PID control system.
Specific embodiment
Below in conjunction with the accompanying drawing in this utility model embodiment, the technical scheme in this utility model embodiment is carried out
Clearly and completely description is it is clear that described embodiment is only a part of embodiment of this utility model rather than whole
Embodiment.Based on the embodiment in this utility model, those of ordinary skill in the art are not under the premise of making creative work
The every other embodiment being obtained, broadly falls into the scope of this utility model protection.
Refer to Fig. 1～2, a kind of ship central authorities cooling water frequency-changing control system, including two sets of PID regulating systems, that is, three
Port valve outlet temperature PID control system and based on PID for core structure changes sea water pump control system, described is core based on PID
The structure changes sea water pump control system of the heart includes master selector, secondary controller, converter, heat exchanger, flow transmitter and temperature
Transmitter, the outfan of described master selector connects the input of secondary controller, and the outfan of secondary controller connects converter
Input, is provided with electronics automatic transfer switch between secondary controller and converter, described electronics automatic transfer switch is a kind of soft
Connect, controller switches over according to three-way valve cold water aperture, is switched to segmentation letter when three-way valve cold water aperture is below 95%
Number is controlled, and reaches more than 95% in three-way valve valve opening and carries out serials control using cooling water outlet temperature, in order to anti-
Only electronics automatic transfer switch frequent switching, electronics automatic transfer switch is designed as ± 2% hysteresis comparator, and that is, valve cold water is opened
It is switched to serials control converter when degree is more than 97%, when valve cold water aperture is less than 93%, frequency conversion is carried out using piecewise function
Control, the outfan of converter connects the input of sea water frequency conversion pump motor, the speed by change sea water frequency conversion pump motor is real
The Flow-rate adjustment of existing sea water, when the flow of sea water changes, changes the outlet temperature of fresh water, water outlet by heat exchanger
Temperature is typically set in 35 DEG C, when being switched to serials control, is that water outlet temperature maintains by changing frequency converter frequency
35 DEG C, when being switched to piecewise function and being controlled, now water outlet temperature is in open loop situations, can pass through three-way valve control
Loop processed changes cold water, hot water flow than the outlet temperature to ensure three-way valve at 36 DEG C, internal ring Flow-rate adjustment adoption rate control
System it is ensured that flow relatively stable, outer shroud adoption rate integral adjustment is it is ensured that heat exchanger outlet temperature is stable.Electronics is cut automatically
Changing switch is to be automatically switched between secondary controller and piecewise function generator according to three-way valve cold water aperture, and realizes becoming
Structure control.The outfan of converter connects the input of sea water frequency conversion motor, the output flow change shadow of sea water frequency conversion motor
Ring the water outlet temperature change of heat exchanger, temperature change feeds back to master selector input by temperature transmitter, constitute outer
Ring controls, and seawater flow change feeds back to secondary controller input by flow transmitter, constitutes internal ring and controls.Actuator with change
Wire between hot device is connected with flow transmitter one end, the transmitter other end pass through wire and master selector and secondary controller it
Between wire connect；The outfan of heat exchanger connects the input of temperature transmitter, and the outfan of temperature transmitter connects homophony
The input of section device.
Further, in three-way valve outlet temperature PID control system described in the utility model, the outfan of master controller connects
Connect the input of temperature control three-way valve, the outfan of temperature control three-way valve connects the input of thermometer for fresh water outlet, water outlet temperature
The outfan of degree meter connects the input of temperature transmitter, and the outfan of temperature transmitter connects the input of master controller.
This utility model adopts serials control, according to the feature of serials control, selects the less seawater flow of hysteresis quality to make
For secondary controlled variable, constitute subloop；Using water outlet temperature as main controlled volume, constitute major loop.The design is with PID for control
Device processed controls 3 sea water pump operations to control seawater flow, the fresh water cooled that need are cooled down by sea water by heat exchanger.In order to ensure
The safety of equipment, the temperature of low temperature fresh water can not too low in case cooled equipment and the low temperature fresh water excessive temperature differentials of cooling and lead
Cause device damage, but the running frequency of sea water pump can not possibly infinitely reduce, simultaneously in order to ensure seawer outlet temperature without departing from
Safety value (45 DEG C) prevents sea water from saltouing and reduces heat exchanger heat exchange efficiency or cause heat exchanger to block.When sea water pump operates in
When lower frequency limit (30Hz) runs, system cannot change sea water pump running frequency again, cannot change seawater flow, if now
Low temperature fresh water water outlet temperature after heat exchanger is too low, and the PID control of temperature control three-way valve itself now can only be relied on to adjust
Section temperature, the flow increasing hot water makes water outlet temperature reach preset value.When hot water aperture is 5%, in order to ensure fresh water
The stablizing of outlet temperature, system switches to by the operation of PID control sea water pump.In order to avoid system frequent switching, in the design
Leave 2% return difference, that is, when hot water aperture drops to 3% by 7%, sea water pump improves running frequency and is simultaneously introduced PID control, when
Only separate unit hot water pump operation when hot water aperture is raised to 7% by 3%, sea water pump is run with 40Hz frequency and exits PID control
By temperature control three-way valve itself PID control.
Ship Central Cooling Water System control system mainly has two kinds at present：1st, ship central authorities' cooling water outlet temperature threeway
Valve controls it is ensured that cooling water outlet temperature is stablized at 36 DEG C, and sea water pump is in rated power full speed running, causes big energy wave
Take.2nd, it is directed to the potentiality of the energy-conservation that ship Central Cooling Water System sea return exists, Alfa Laval company of Sweden produces
ENGARD control system, according to three Taiwan Straits water pumps in the thermic load control sea return of central cooler, (wherein two is double
Fast pump, one is single speed pump, and discharge capacity is 50% design discharge) open, stop, pole-changing control, thus optimizing regulation sea water stream
Amount, to reach the effect of part energy-conservation.Its maximum is disadvantageous in that system is operated on off state it is impossible to continuously be adjusted
Speed.
Realize Discrete control sea water variable frequency pump to reach optimum energy-saving effect with PID for core variable-structure control.For very
Many systems with temperature as control object, system hysteresis quality is often very big, and requires system real time high during system operation, can
To adopt cascade control system.According to the feature of serials control, select delayed less seawater flow as secondary controlled variable, structure
Become subloop；Cooler water outlet temperature, as main controlled variable, constitutes major loop.The time of equivalent object so can be made
Constant reduces, and improves the work efficiency of system, accelerates response speed, is preferably controlled quality.The system adopts tandem control
System is controlled to cooling water system it is ensured that effectively suppressing big inertia, long time lag, the characteristic such as easy overshoot.
For energy-conservation stability requirement, single cascade loop control is difficult to meet system control requirement, frequency conversion sea water pump first
Frequency is not allow no lower limit to reduce；Take into account whether seawer outlet temperature exceeds safety value (49 DEG C), because in sea water simultaneously
During flow-reduction, the temperature rise of sea water can increase, and for preventing sea-water salt from separating out, seawer outlet temperature reaches sea water during margin of safety
Pump can not reduction of speed again, automatic tee temperature-sensing valve now can only be relied on to automatically adjust fresh water temperature；When frequency conversion sea water pump frequency reaches
During bound, system no longer changes frequency conversion sea water pump speed it is ensured that system energy stable operation, is now only capable of being come by three-way temperature control valve
Adjust water outlet temperature；Also it is only capable of participating in controlling by three-way temperature control valve when system temperature reaches the safety value upper limit, i.e. system sea water
Pump speed exits control；Based on above-mentioned, control system adopts the variable-structure control mode that cascade PID is core.
Switch function feeds back aperture according to three-way valve and is judged, three-way valve is to adjust hot and cold water flow-rate ratio, feeds back aperture
In 0-95%, switch function is switched to piecewise function generator, is switched to and automatically controls mould during feedback aperture 95%-100%
Formula, at this moment adjusts board-like cooler outlet temperature, and piecewise function refers to that during 0-93%, converter 30Hz runs, and relies on threeway itself
PID adjusts low temperature fresh water temperature, and feedback aperture 93%-97% is run according to ramp function, when three-way valve in 97%-100% is
Temperature control put into by converter, among these in order to ensure the stability switching, should stay ± 2% return difference, and frequency conversion accelerates to adjust
(and putting into automatic running), that is, aperture is reduced to 93% by 97%, and converter is pressed 45Hz and run.
Based on the superiority of central cooling system, used in current ship, it mostly is central cooling system, central at present cold
As long as but system has two kinds of primitive form stand alone type central cooling systems, mixed-flow Central Cooling Water System.Mixed-flow central authorities are cold
But system carrys out regulation parameter using the mixing of high-low-temperature, and this methods for cooling passes through mixing valve by high temperature fresh water, low temperature fresh water
UNICOM, according to the temperature requirements of high temperature fresh water, mixing valve controls low temperature fresh water to enter the flow of high temperature freshwater system, owns
The heat of fresh water is taken away by the sea water in central cooler.Relatively with free-standing cooler for, lacked a high temperature fresh water cold
But device, high temperature fresh water is cooled down by low temperature fresh water.The water temperature of so turnover diesel-driven generator and high-temperature cooler controls more
For difficulty.
It is obvious to a person skilled in the art that this utility model is not limited to the details of above-mentioned one exemplary embodiment, and
And in the case of without departing substantially from spirit or essential attributes of the present utility model, this practicality can be realized in other specific forms new
Type.Therefore, no matter from the point of view of which point, embodiment all should be regarded as exemplary, and be nonrestrictive, this practicality is new
The scope of type is limited by claims rather than described above, it is intended that the containing of equivalency that will fall in claim
All changes in justice and scope are included in this utility model.Any reference in claim should not be considered as limiting
Involved claim.
Moreover, it will be appreciated that although this specification is been described by according to embodiment, not each embodiment only wraps
Containing an independent technical scheme, only for clarity, those skilled in the art should for this narrating mode of description
Using description as an entirety, the technical scheme in each embodiment can also form those skilled in the art through appropriately combined
Understandable other embodiment.
Claims (2)
1. a kind of ship central authorities cooling water frequency-changing control system, including two sets of PID regulating systems, i.e. three-way valve outlet temperature PID
Control system and based on PID for the structure changes sea water pump control system of core it is characterised in that：Described is core based on PID
Structure changes sea water pump control system includes master selector, secondary controller, converter, heat exchanger, flow transmitter and temperature pick-up
Device, the outfan of described master selector connects the input of secondary controller, and the outfan of secondary controller connects the input of converter
End, is provided with electronics automatic transfer switch, described electronics automatic transfer switch is that one kind is flexible coupling between secondary controller and converter,
Controller switches over according to three-way valve cold water aperture, and electronics automatic transfer switch is ± 2% hysteresis comparator；Converter defeated
Go out the input that end connects sea water frequency conversion pump motor；Electronics automatic transfer switch passes through wire and secondary controller and segmentation letter respectively
Number generator connects；The outfan of converter connects the input of seawater flow actuator, the outfan of seawater flow actuator
Connect the input of heat exchanger, the wire between seawater flow actuator and heat exchanger is connected with flow transmitter one end, pick-up
The wire that the device other end passes through between wire and master selector and secondary controller is connected；The outfan of heat exchanger connects temperature pick-up
The input of device, the outfan of temperature transmitter connects the input of master selector.
2. ship according to claim 1 central authorities' cooling water frequency-changing control system it is characterised in that：Described threeway valve outlet port
In temperature PID control system, the outfan of master controller connects the input of temperature control three-way valve, and the outfan of temperature control three-way valve is even
Connect the input of thermometer for fresh water outlet, the outfan of thermometer for fresh water outlet connects the input of temperature transmitter, temperature becomes
Send the input of the outfan connection master controller of device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620878787.6U CN205952272U (en) | 2016-08-13 | 2016-08-13 | Cooling water frequency conversion control system of boats and ships central authorities |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620878787.6U CN205952272U (en) | 2016-08-13 | 2016-08-13 | Cooling water frequency conversion control system of boats and ships central authorities |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205952272U true CN205952272U (en) | 2017-02-15 |
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ID=57975746
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620878787.6U Expired - Fee Related CN205952272U (en) | 2016-08-13 | 2016-08-13 | Cooling water frequency conversion control system of boats and ships central authorities |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205952272U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108750064A (en) * | 2018-05-14 | 2018-11-06 | 广州航海学院 | A kind of ship center cooling water multistage ratio control system and method |
| CN114348224A (en) * | 2022-02-18 | 2022-04-15 | 中国船舶重工集团公司第七一九研究所 | Ship variable frequency pump cooling system and control method thereof |
-
2016
- 2016-08-13 CN CN201620878787.6U patent/CN205952272U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108750064A (en) * | 2018-05-14 | 2018-11-06 | 广州航海学院 | A kind of ship center cooling water multistage ratio control system and method |
| CN108750064B (en) * | 2018-05-14 | 2023-09-08 | 广州航海学院 | Ship central cooling water multistage ratio control system and method |
| CN114348224A (en) * | 2022-02-18 | 2022-04-15 | 中国船舶重工集团公司第七一九研究所 | Ship variable frequency pump cooling system and control method thereof |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| 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: 20170215 Termination date: 20200813 |