CN109915351A - A kind of speed of feedwater holding meanss and speed of feedwater control system - Google Patents
A kind of speed of feedwater holding meanss and speed of feedwater control system Download PDFInfo
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- CN109915351A CN109915351A CN201910196730.6A CN201910196730A CN109915351A CN 109915351 A CN109915351 A CN 109915351A CN 201910196730 A CN201910196730 A CN 201910196730A CN 109915351 A CN109915351 A CN 109915351A
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- power supply
- speed
- solenoid valve
- feedwater
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Abstract
The present invention provides a kind of speed of feedwater holding meanss, including driving relay and guarantor's position solenoid valve；The control terminal of driving relay is connected with the first DC power supply, and normally open contact thereon is connected to and protects between position solenoid valve and the second DC power supply and the two is concatenated into circuit；Position solenoid valve is protected to be set on the oil inlet pipe and oil exit pipe between 4/3 solenoid valve and hydraulic cylinder；First and second DC power supply is identical or different power supply, to be responsible for the power supply powered to PLC or PLC control is powered；When the first DC power supply power supply trouble, the normally opened contact of relay is driven to disconnect, the circuit between position solenoid valve and the second DC power supply is protected in truncation, so that guarantor's position solenoid valve is not received the power supply of the second DC power supply in closed state, is realized that speed of feedwater is kept.The problem of implementation present invention can solve scoop tube under PLC power supply fault mode and restore initial, set position and speed of feedwater be caused to cannot keep, water supply fluctuation, improves the safety of unit operation.
Description
Technical field
The present invention relates to electrically driven feed pump control technology field more particularly to a kind of speed of feedwater holding meanss and water supply
Revolution speed control system.
Background technique
Electronic main feed pump system (APA system) is the important system of power station conventional island secondary circuit, carries and sends out to steam
Raw device provides the critical function of water supply, and APA pump is then the core of main feed system, rises to the safe and stable operation in entire power station
Vital effect.
As shown in Figure 1, feed pump (APA pump) revolution speed control system is by feed pump control system 1/(such as PLC), scoop tube position
Control mechanism 2/With scoop tube 3/Deng composition；Wherein, scoop tube position control mechanism 2/Including electromagnetism draught control mechanism 21/, 4/3 solenoid valve
22/, hydraulic cylinder 23/, piston 24/And scoop tube position sensor 25/Deng.Due to 4/3 solenoid valve 22/Pass through oil inlet pipe A and oil extraction
Pipe B is respectively corresponded and by piston 24/Separate hydraulic cylinder 23/Oil inlet at left and right chamber is connected with oil discharge outlet, so that PLC1/It can be with
By to 4/3 solenoid valve 22/Open and close control changes hydraulic cylinder 23/Oil inlet quantity and oil drain quantity adjust hydraulic cylinder 23/Interior work
Plug 24/Position, thus adjust with piston 24/The scoop tube 3 of linkage/Position is realized to the scoop tube 3 in fluid coupling/Position into
Row accurately and continuously controls, and then changes oil-filled quantity in fluid coupling, reaches the variable velocity tune to mechanical rotating machinery
Section.But if PLC1/It breaks down, scoop tube 3/It can restore initial, set position, cause water supply pump stall, water supply fluctuation,
To directly affect unit to water management, very big security risk is brought to unit operation.Therefore, it is necessary to solve PLC1/Therefore
Scoop tube 3 in the case of barrier/The problem of restoring initial, set position maintains failure eve scoop tube 3/Position, to scoop tube 3/It realizes and protects position
Function.
However, signal fault mode of the existing solution just for PLC, as number of patent application is
201320739537.0, the utility model patent of entitled " device that a kind of scoop tube for keeping feed pump controls position ",
It solves electronic PLC feed pump scoop tube when exporting control instruction and sending to servo electromagnetic valve signal fault and restores initial setting position
The problem of setting maintains speed of feedwater before failure, but is a lack of the solution for PLC power supply failure.
Summary of the invention
The technical problem to be solved by the embodiment of the invention is that providing a kind of speed of feedwater holding meanss and feed pump
Revolution speed control system can solve scoop tube under PLC power supply fault mode and restore initial, set position and lead to speed of feedwater
It cannot keep, the problem of water supply fluctuation, improve the safety of unit operation.
In order to solve the above-mentioned technical problem, the embodiment of the invention provides a kind of speed of feedwater holding meanss, for wrapping
It includes in the speed of feedwater control system of PLC, scoop tube position control mechanism and scoop tube, the scoop tube position control mechanism includes electricity
Magnetic regulator, 4/3 electromagnetic valve, hydraulic cylinder, piston and scoop tube position sensor；Including driving relay and protect position electromagnetism
Valve；Wherein,
The control terminal of the driving relay is connected with the first DC power supply, and normally open contact thereon is connected to the guarantor position electricity
Circuit is concatenated between magnet valve and the second DC power supply and by guarantor's position solenoid valve and second DC power supply；The guarantor position
Solenoid valve is set on the oil inlet pipe and oil exit pipe between 4/3 solenoid valve and the hydraulic cylinder；Wherein, described first is straight
Galvanic electricity source and second DC power supply are same power supplies or different power supply, for be responsible for the PLC power supply powered or by
The power supply of the PLC control power supply；
When the first DC power supply power supply trouble, the normally opened contact of the driving relay is disconnected, and the guarantor position electricity is truncated
Circuit between magnet valve and second DC power supply makes guarantor position solenoid valve fail receiving second DC power supply just
It often powers and is in closed state, oil inlet quantity and oil drain quantity between 4/3 solenoid valve and the hydraulic cylinder is truncated, realization is given
Pump rotary speed is kept.
Wherein, when the second DC power supply power supply trouble, the guarantor position solenoid valve power loss direct reduction is closed form
Oil inlet quantity and oil drain quantity between 4/3 solenoid valve and the hydraulic cylinder is truncated in state, realizes that speed of feedwater is kept.
Wherein, self-test or the detection scoop tube are passed through by the PLC for voltage output by the power supply of PLC control power supply
Position sensor scoop tube position feedback situation collected is come the power supply that controls.
Wherein, the driving relay is intermediate relay；Guarantor's position solenoid valve is two position four-way solenoid valves.
Wherein, further includes: the alarm module being connected with guarantor's position solenoid valve；The alarm module is used for the guarantor position
When solenoid valve is in closed state, alarm.
Wherein, the alarm module by alarm relay, buzzer and/or indicator lamp groups at.
The embodiment of the invention also provides a kind of speed of feedwater control systems, including speed of feedwater above-mentioned to keep dress
It sets.
The implementation of the embodiments of the present invention has the following beneficial effects:
The present invention occurs under power-down mode (being such as responsible for the power supply appearance event powered to PLC in feed pump control system (PLC)
When barrier or the power supply of PLC control power supply break down), relay loss of excitation is driven, position solenoid valve is protected and restores power loss initially to close
Conjunction state, cutting oil circuit keep scoop tube position constant to ensure that water supply pump speed is maintained, to solve the event of PLC power supply
The problem of scoop tube restores initial, set position and speed of feedwater is caused to cannot keep under barrier mode, water supply fluctuation is improved
The safety of unit operation.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention, for those of ordinary skill in the art, without any creative labor, according to
These attached drawings obtain other attached drawings and still fall within scope of the invention.
Fig. 1 is the logical construction schematic diagram of speed of feedwater control system in the prior art；
Fig. 2 is the schematic arrangement figure for the speed of feedwater holding meanss that the embodiment of the present invention one provides；
Fig. 3 is the logical construction schematic diagram of speed of feedwater control system provided by Embodiment 2 of the present invention.
Specific embodiment
To make the object, technical solutions and advantages of the present invention clearer, the present invention is made into one below in conjunction with attached drawing
Step ground detailed description.
As shown in Fig. 2, in the embodiment of the present invention one, a kind of speed of feedwater holding meanss provided, for including
In the speed of feedwater control system (not shown) of PLC, scoop tube position control mechanism and scoop tube, scoop tube position control mechanism includes
Electromagnetism draught control mechanism, 4/3 electromagnetic valve, hydraulic cylinder, piston and scoop tube position sensor；
The speed of feedwater holding meanss include driving relay T1 and guarantor position solenoid valve T2；Wherein,
The control terminal of driving relay T1 is connected with the first DC power supply U1, and normally open contact J1 thereon is connected to and protects position electromagnetism
Circuit is concatenated between valve T2 and the second DC power supply U2 and by position solenoid valve T2 and the second DC power supply U2 is protected；Protect position solenoid valve
T2 is set on the oil inlet pipe and oil exit pipe between 4/3 solenoid valve and hydraulic cylinder；Wherein, the first DC power supply U1 and second is straight
Galvanic electricity source U2 is same power supplies or different power supply, to be responsible for the PLC power supply powered or by the power supply of PLC control power supply；
When the first DC power supply U1 power supply trouble, the normally opened contact J1 of driving relay T1 is disconnected, and position solenoid valve T2 is protected in truncation
With the circuit between the second DC power supply U2, guarantor position solenoid valve T2 is made to fail to receive the second DC power supply U2 normal power supply and be in
Oil inlet quantity and oil drain quantity between 4/3 solenoid valve and hydraulic cylinder is truncated in closed state, realizes that speed of feedwater is kept.
It is understood that regardless of whether the first DC power supply U1 power supply normal, if the second DC power supply U2 power supply trouble,
Then protecting a solenoid valve T2 power loss direct reduction is closed state, and the oil inlet quantity between 4/3 solenoid valve and hydraulic cylinder and row is truncated
Oil mass realizes that speed of feedwater is kept.
It should be noted that the first DC power supply U1 and the second DC power supply U2 are not limited solely to above-mentioned be responsible for PLC
The power supply of power supply or the power supply powered by PLC control, further include but are not limited to any in original speed of feedwater control system
Component or the mechanism power supply powered or the power supply controlled.Certainly, the feed pump for the ease of managing, in the embodiment of the present invention one
Revolving speed holding meanss are by being equipped with the power interface board for connecting the first DC power supply U1 and the second DC power supply U2 come real
The access of existing power supply.
In one embodiment, self-test or detection scoop tube position are passed through by PLC for voltage output by the power supply of PLC control power supply
The power supply for setting sensor scoop tube position feedback situation collected to control.It is controlled for example, the first DC power supply U1 is used by PLC
The power supply of power supply, if PLC self-test situation is normal at this time, PLC controls the first DC power supply U1 electricity by closing the switch
Pressure output is normal, i.e. the first DC power supply U1 power supply；Conversely, then PLC is disconnected by switch to control the first DC power supply U1 electricity
Pressure output disconnects, that is, disconnects the first DC power supply U1 in power supply trouble；For another example, the first DC power supply U1 is used to be controlled by PLC and be supplied
The power supply of electricity, if PLC detection scoop tube position sensor scoop tube position feed back signal value collected is located in preset range at this time,
Then it is normal to control the first DC power supply U1 voltage output by closing the switch by PLC, that is, powers；Conversely, then PLC is disconnected by switch
The the first DC power supply U1 voltage output of control that comes disconnects, that is, disconnects the first DC power supply U1 in power supply trouble.It is understood that
It is that the power supply by PLC control power supply not only includes the above-mentioned example enumerated or understood, further includes the control that other detections are formed
System, such as PLC detection PLC output order broken string, feedback signal broken string receive situations such as instruction broken string to control power supply.In this hair
In bright embodiment one, drive relay T1 and protect position solenoid valve T2 can according to actual selection on the market existing product type and
Model.Such as driving relay T1 is intermediate relay, and guarantor position solenoid valve T2 is two position four-way solenoid valves；For another example, relay is driven
T1 is electromagnetic relay, protects position solenoid valve T2 model S16VH1813G.
In the embodiment of the present invention one, speed of feedwater holding meanss further include: the alarm being connected with guarantor position solenoid valve T2
Module T3；Alarm module T3 alarms when for protecting position solenoid valve T2 in closed state.Wherein, alarm module T3 is by reporting
Alert relay, buzzer and/or indicator lamp groups at.It is understood that can use in original speed of feedwater control system
On the one hand existing dcs DCS acquires the actual speed of feed pump and protects position solenoid valve T2 alarm, on the other hand
The raising speed of operator and reduction of speed formulation are sent to the control system of feed pump.When Loss of power failure occurs, protects position solenoid valve T2 and send DCS
Blackout, DCS alarm after negating and generate.
It is understood that the speed of feedwater holding meanss in the embodiment of the present invention one, are equipped with straight for connecting first
The power interface board of galvanic electricity source U1 and the second DC power supply U2,
In the embodiment of the present invention two, a kind of speed of feedwater control system is additionally provided, including in the embodiment of the present invention one
Speed of feedwater holding meanss.Wherein, the speed of feedwater control system in the embodiment of the present invention two is in original feed pump
On the basis of revolution speed control system, the speed of feedwater holding meanss in the embodiment of the present invention one have been increased newly, as shown in Figure 3.Fig. 3
In, 1 it is PLC, 2 be scoop tube position control mechanism, 3 is scoop tube 3/, 21 be electromagnetism draught control mechanism, 22 be 4/3 solenoid valve, 23 be liquid
Compressing cylinder, 24 be piston and 25 be scoop tube position sensor, A is oil inlet pipe and B is oil exit pipe.At this point, the embodiment of the present invention two
In speed of feedwater holding meanss in the first DC power supply and the second DC power supply be all made of be responsible for PLC power electricity
Source, as long as PLC power supply failure problem, then the guarantor position solenoid valve power loss in speed of feedwater holding meanss is closed,
Oil circuit is cut off to realize that speed of feedwater is kept.
Since the feed pump in the speed of feedwater holding meanss and the embodiment of the present invention one in the embodiment of the present invention two turns
Fast holding meanss have identical structure and connection relationship, refer to foregoing teachings, this is no longer going to repeat them.
The implementation of the embodiments of the present invention has the following beneficial effects:
The present invention occurs under power-down mode (being such as responsible for the power supply appearance event powered to PLC in feed pump control system (PLC)
When barrier or the power supply of PLC control power supply break down), relay loss of excitation is driven, position solenoid valve is protected and restores power loss initially to close
Conjunction state, cutting oil circuit keep scoop tube position constant to ensure that water supply pump speed is maintained, to solve the event of PLC power supply
The problem of scoop tube restores initial, set position and speed of feedwater is caused to cannot keep under barrier mode, water supply fluctuation is improved
The safety of unit operation.
Above disclosed is only a preferred embodiment of the present invention, cannot limit the power of the present invention with this certainly
Sharp range, therefore equivalent changes made in accordance with the claims of the present invention, are still within the scope of the present invention.
Claims (7)
1. a kind of speed of feedwater holding meanss, for the speed of feedwater control including PLC, scoop tube position control mechanism and scoop tube
In system processed, the scoop tube position control mechanism includes electromagnetism draught control mechanism, 4/3 electromagnetic valve, hydraulic cylinder, piston and scoop tube position
Set sensor；It is characterised in that it includes driving relay and guarantor's position solenoid valve；Wherein,
The control terminal of the driving relay is connected with the first DC power supply, and normally open contact thereon is connected to the guarantor position electricity
Circuit is concatenated between magnet valve and the second DC power supply and by guarantor's position solenoid valve and second DC power supply；The guarantor position
Solenoid valve is set on the oil inlet pipe and oil exit pipe between 4/3 solenoid valve and the hydraulic cylinder；Wherein, described first is straight
Galvanic electricity source and second DC power supply are same power supplies or different power supply, for be responsible for the PLC power supply powered or by
The power supply of the PLC control power supply；
When the first DC power supply power supply trouble, the normally opened contact of the driving relay is disconnected, and the guarantor position electricity is truncated
Circuit between magnet valve and second DC power supply makes guarantor position solenoid valve fail receiving second DC power supply just
It often powers and is in closed state, oil inlet quantity and oil drain quantity between 4/3 solenoid valve and the hydraulic cylinder is truncated, realization is given
Pump rotary speed is kept.
2. speed of feedwater holding meanss as described in claim 1, which is characterized in that when second DC power supply power supply event
When barrier, the guarantor position solenoid valve power loss direct reduction is closed state, is truncated between 4/3 solenoid valve and the hydraulic cylinder
Oil inlet quantity and oil drain quantity, realize speed of feedwater keep.
3. speed of feedwater holding meanss as claimed in claim 2, which is characterized in that by the power supply of PLC control power supply
For voltage output by the PLC by self-test or the detection scoop tube position sensor scoop tube position feedback situation collected come
The power supply of control.
4. speed of feedwater holding meanss as claimed in claim 3, which is characterized in that the driving relay is intermediate relay
Device；Guarantor's position solenoid valve is two position four-way solenoid valves.
5. speed of feedwater holding meanss as claimed in claim 4, which is characterized in that further include: with guarantor position solenoid valve
Connected alarm module；The alarm module is alarmed when being in closed state for guarantor's position solenoid valve.
6. speed of feedwater holding meanss as claimed in claim 5, which is characterized in that the alarm module is by alarm relay
Device, buzzer and/or indicator lamp groups at.
7. a kind of speed of feedwater control system, which is characterized in that including feed pump such as of any of claims 1-6
Revolving speed holding meanss.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910196730.6A CN109915351B (en) | 2019-03-15 | 2019-03-15 | Water feed pump rotating speed keeping device and water feed pump rotating speed control system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910196730.6A CN109915351B (en) | 2019-03-15 | 2019-03-15 | Water feed pump rotating speed keeping device and water feed pump rotating speed control system |
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| Publication Number | Publication Date |
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| CN109915351A true CN109915351A (en) | 2019-06-21 |
| CN109915351B CN109915351B (en) | 2020-09-18 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201910196730.6A Active CN109915351B (en) | 2019-03-15 | 2019-03-15 | Water feed pump rotating speed keeping device and water feed pump rotating speed control system |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3938451A1 (en) * | 1988-12-06 | 1990-06-07 | Bauakademie Ddr | Pressure maintenance in network heating system - involves blocking valve in case of pump power supply failure |
| CN203548161U (en) * | 2013-11-20 | 2014-04-16 | 中国神华能源股份有限公司 | Device for keeping control position of scoop tube of feed pump |
| CN108716462A (en) * | 2018-04-13 | 2018-10-30 | 广东核电合营有限公司 | A kind of speed holding meanss and system for nuclear power feed pump group |
-
2019
- 2019-03-15 CN CN201910196730.6A patent/CN109915351B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3938451A1 (en) * | 1988-12-06 | 1990-06-07 | Bauakademie Ddr | Pressure maintenance in network heating system - involves blocking valve in case of pump power supply failure |
| CN203548161U (en) * | 2013-11-20 | 2014-04-16 | 中国神华能源股份有限公司 | Device for keeping control position of scoop tube of feed pump |
| CN108716462A (en) * | 2018-04-13 | 2018-10-30 | 广东核电合营有限公司 | A kind of speed holding meanss and system for nuclear power feed pump group |
Non-Patent Citations (1)
| Title |
|---|
| 牛云等: "岭澳二期核电站电动主给水泵系统调速原理的改进", 《核科学与工程》 * |
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