CN109915351B - Water feed pump rotating speed keeping device and water feed pump rotating speed control system - Google Patents
Water feed pump rotating speed keeping device and water feed pump rotating speed control system Download PDFInfo
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- CN109915351B CN109915351B CN201910196730.6A CN201910196730A CN109915351B CN 109915351 B CN109915351 B CN 109915351B CN 201910196730 A CN201910196730 A CN 201910196730A CN 109915351 B CN109915351 B CN 109915351B
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Abstract
The invention provides a water feeding pump rotating speed maintaining device, which comprises a driving relay and a position-maintaining electromagnetic valve, wherein the driving relay is connected with the position-maintaining electromagnetic valve; the control end of the driving relay is connected with a first direct-current power supply, and a normally open contact on the driving relay is connected between the position-keeping electromagnetic valve and a second direct-current power supply and is connected in series to form a loop; the position-keeping electromagnetic valve is arranged on the oil inlet pipe and the oil discharge pipe between the 4/3 electromagnetic valve and the hydraulic oil cylinder; the first direct current power supply and the second direct current power supply are the same or different power supplies and are power supplies responsible for supplying power to the PLC or controlling the power supply of the PLC; when the first direct-current power supply fails, the normally-open contact of the driving relay is disconnected, and a loop between the position-keeping electromagnetic valve and the second direct-current power supply is cut off, so that the position-keeping electromagnetic valve is in a closed state without receiving the power supply of the second direct-current power supply, and the rotating speed of the water feeding pump is kept. By implementing the invention, the problems that the rotation speed of the water feeding pump cannot be maintained and the water feeding greatly fluctuates due to the fact that the scoop tube is restored to the initial set position in the PLC power supply failure mode can be solved, and the operation safety of the unit is improved.
Description
Technical Field
The invention relates to the technical field of electric feed pump control, in particular to a feed pump rotating speed maintaining device and a feed pump rotating speed control system.
Background
An electric main water supply pump system (APA system) is an important system of a conventional island two-loop of a power station, plays an important role in supplying water to a steam generator, and plays a vital role in the safe and stable operation of the whole power station.
As shown in FIG. 1, a feed pump (APA pump) rotation speed control system is composed of a feed pump control system 1/(e.g. PLC), spoon position control mechanism 2/Spoon and spoon tube 3/And the like; wherein, the position control mechanism 2 of the spoon tube/Comprising a solenoid actuator 21/4/3 electromagnetic valve 22/ Hydraulic cylinder 23/Piston 24/And a spoon position sensor 25/And the like. Due to the 4/3 electromagnetic valve 22/Through the oil inlet pipe A and the oil outlet pipe B respectively corresponding to the piston 24/Separating liquidPressure oil cylinder 23/The oil inlets and oil outlets of the left and right chambers are connected, so that the PLC1/Can be operated by the pair of 4/3 electromagnetic valves 22/Opening and closing control to change hydraulic cylinder 23/The oil inlet amount and the oil discharge amount are adjusted, and the hydraulic oil cylinder 23 is adjusted/Inner piston 24/Thereby adjusting the position of piston 24/Linked spoon tube 3/Position, realizing alignment of scoop tube 3 in fluid coupling/The position is accurately and continuously controlled, so that the oil filling amount in the hydraulic coupler is changed, and the variable speed regulation of mechanical rotating equipment is achieved. However, if the PLC1/When a fault occurs, the spoon tube 3/The initial setting position can be recovered, the water feeding pump stalls, the water feeding fluctuates greatly, and therefore the water feeding control of the unit is directly influenced, and great potential safety hazards are brought to the operation of the unit. Therefore, it is necessary to address PLC1/Scoop 3 in case of failure/The problem of the initial set position is recovered, and the spoon tube 3 which is just before the fault is maintained/Position, to the spoon tube 3/The bit-keeping function is realized.
However, the existing solution is only to the signal failure mode of PLC, such as patent application No. 201320739537.0, the utility model named "a device for keeping the spoon pipe control position of the feed pump", which solves the problem that the spoon pipe of the feed pump recovers the initial setting position when the output control command is sent to the servo solenoid valve signal failure condition by the electric PLC, and maintains the rotating speed of the feed pump before the failure, but lacks the solution to the PLC power supply failure.
Disclosure of Invention
The technical problem to be solved by the embodiment of the invention is to provide a water feeding pump rotating speed maintaining device and a water feeding pump rotating speed control system, which can solve the problems that the rotating speed of a water feeding pump cannot be maintained and the water feeding greatly fluctuates due to the fact that a scoop tube is restored to an initial set position in a PLC power supply failure mode, and improve the operation safety of a unit.
In order to solve the technical problem, the embodiment of the invention provides a water feed pump rotating speed maintaining device which is used for a water feed pump rotating speed control system comprising a PLC, a spoon pipe position control mechanism and a spoon pipe, wherein the spoon pipe position control mechanism comprises an electromagnetic force regulator, a 4/3 electromagnetic valve, a hydraulic oil cylinder, a piston and a spoon pipe position sensor; the device comprises a driving relay and a position-keeping electromagnetic valve; wherein the content of the first and second substances,
the control end of the driving relay is connected with a first direct-current power supply, and a normally open contact on the driving relay is connected between the position-keeping electromagnetic valve and a second direct-current power supply and connects the position-keeping electromagnetic valve and the second direct-current power supply in series to form a loop; the position-keeping electromagnetic valve is arranged on an oil inlet pipe and an oil discharge pipe between the 4/3 electromagnetic valve and the hydraulic oil cylinder; the first direct-current power supply and the second direct-current power supply are the same power supply or different power supplies, and the first direct-current power supply is a power supply responsible for supplying power to the PLC or a power supply controlled by the PLC;
when the first direct-current power supply fails, the normally open contact of the driving relay is disconnected, a loop between the position-keeping electromagnetic valve and the second direct-current power supply is cut off, the position-keeping electromagnetic valve cannot receive the normal power supply of the second direct-current power supply and is in a closed state, the oil inlet amount and the oil discharge amount between the 4/3 electromagnetic valve and the hydraulic oil cylinder are cut off, and the rotating speed of the water feeding pump is kept.
When the second direct current power supply fails, the position-keeping electromagnetic valve is powered off and directly reset to be in a closed state, the oil inlet amount and the oil discharge amount between the 4/3 electromagnetic valve and the hydraulic oil cylinder are cut off, and the rotating speed of the water feeding pump is kept.
The power supply controlled by the PLC is a power supply with voltage output controlled by the PLC through self-checking or detecting the feedback condition of the position of the spoon pipe collected by the spoon pipe position sensor.
Wherein the driving relay is an intermediate relay; the position-keeping electromagnetic valve is a two-position four-way electromagnetic valve.
Wherein, still include: the alarm module is connected with the position-keeping electromagnetic valve; and the alarm module is used for giving an alarm when the position-keeping electromagnetic valve is in a closed state.
The alarm module is composed of an alarm relay, a buzzer and/or an indicator light.
The embodiment of the invention also provides a system for controlling the rotating speed of the feed pump, which comprises the device for maintaining the rotating speed of the feed pump.
The embodiment of the invention has the following beneficial effects:
according to the invention, under the power failure mode of a water supply pump control system (PLC) (such as when the power supply which is responsible for supplying power to the PLC fails or the power supply which is used for controlling power supply to the PLC fails), the relay is driven to lose magnetism, the position-keeping electromagnetic valve loses power and restores to an initial closed state, and the oil way is cut off, so that the position of the scoop tube is not changed to ensure that the speed of the water supply pump is maintained, thus the problems that the rotating speed of the water supply pump cannot be maintained and the water supply fluctuates greatly due to the fact that the scoop tube restores to an initial set position under the power supply failure mode of the PLC are solved, and.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is within the scope of the present invention for those skilled in the art to obtain other drawings based on the drawings without inventive exercise.
FIG. 1 is a schematic diagram of a logic structure of a water feed pump speed control system in the prior art;
FIG. 2 is a schematic diagram of a rotational speed maintaining device of a water pump according to a first embodiment of the present invention;
fig. 3 is a schematic logical structure diagram of a feed pump rotational speed control system according to a second embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings.
As shown in fig. 2, a water-feeding pump rotation speed maintaining device provided in the first embodiment of the present invention is used in a water-feeding pump rotation speed control system (not shown) including a PLC, a scoop tube position control mechanism, and a scoop tube, where the scoop tube position control mechanism includes an electromagnetic force regulator, a 4/3 electromagnetic valve, a hydraulic cylinder, a piston, and a scoop tube position sensor;
the feed water pump rotating speed maintaining device comprises a driving relay T1 and a position-maintaining electromagnetic valve T2; wherein the content of the first and second substances,
the control end of the driving relay T1 is connected with a first direct-current power supply U1, a normally open contact J1 on the driving relay is connected between the position-keeping solenoid valve T2 and a second direct-current power supply U2, and the position-keeping solenoid valve T2 and the second direct-current power supply U2 are connected in series to form a loop; the position-keeping electromagnetic valve T2 is arranged on an oil inlet pipe and an oil discharge pipe between the 4/3 electromagnetic valve and the hydraulic oil cylinder; the first direct-current power supply U1 and the second direct-current power supply U2 are the same power supply or different power supplies and are power supplies responsible for supplying power to the PLC or power supplies controlled by the PLC;
when the first direct-current power supply U1 fails in power supply, the normally open contact J1 of the drive relay T1 is disconnected, a loop between the position-keeping electromagnetic valve T2 and the second direct-current power supply U2 is cut off, the position-keeping electromagnetic valve T2 cannot receive normal power supply of the second direct-current power supply U2 and is in a closed state, oil inlet amount and oil discharge amount between the 4/3 electromagnetic valve and the hydraulic oil cylinder are cut off, and the rotating speed of the water feed pump is kept.
It can be understood that no matter whether the power supply of the first direct current power supply U1 is normal, if the power supply of the second direct current power supply U2 fails, the position-keeping electromagnetic valve T2 is powered off and directly reset to be in a closed state, the oil inlet amount and the oil discharge amount between the 4/3 electromagnetic valve and the hydraulic oil cylinder are cut off, and the rotating speed of the water feeding pump is kept.
It should be noted that the first dc power supply U1 and the second dc power supply U2 are not limited to the above power supply responsible for supplying power to the PLC or the power supply controlled by the PLC, but include, but not limited to, the power supply supplying power to any component or mechanism of the existing feed water pump rotational speed control system or the power supply controlled thereby. Certainly, for convenience of management, the feed pump rotation speed maintaining device in the first embodiment of the present invention implements power connection by providing a power interface board card for connecting the first dc power supply U1 and the second dc power supply U2.
In one embodiment, the power supply controlled by the PLC to supply power is a power supply whose voltage output is controlled by the PLC through self-checking or detecting the feedback of the position of the scoop as collected by the scoop position sensor. For example, the first direct current power supply U1 adopts a power supply controlled by the PLC, and at this time, if the PLC self-detection condition is normal, the PLC controls the voltage output of the first direct current power supply U1 to be normal by switching on and off, that is, the first direct current power supply U1 supplies power; otherwise, the PLC controls the voltage output of the first dc power supply U1 to be turned off by turning on or off, that is, turns off the first dc power supply U1 to present a power supply fault; for another example, the first dc power supply U1 adopts a power supply controlled by the PLC to supply power, and at this time, if the PLC detects that the value of the feedback signal of the position of the scoop tube collected by the scoop tube position sensor is within the predetermined range, the PLC controls the voltage output of the first dc power supply U1 to be normal by closing the switch, that is, supplies power; otherwise, the PLC controls the voltage output of the first dc power supply U1 to be turned off by turning on or off, that is, turns off the first dc power supply U1 to cause a power failure. It is understood that the power supply controlled by the PLC includes not only the above-listed or understood examples, but also other controls formed by detecting, for example, a PLC output command disconnection, a feedback signal disconnection, a reception command disconnection, and the like to control power supply. In the first embodiment of the present invention, the driving relay T1 and the position-keeping solenoid valve T2 may be selected according to the type and model of the product currently available in the market. If the driving relay T1 is an intermediate relay, the position-keeping solenoid valve T2 is a two-position four-way solenoid valve; for another example, the driving relay T1 is an electromagnetic relay, and the retention electromagnetic valve T2 is model S16VH 1813G.
In the first embodiment of the present invention, the device for maintaining the rotational speed of the feed pump further includes: the alarm module T3 is connected with the position-keeping solenoid valve T2; the alarm module T3 is used for alarming when the position-keeping solenoid valve T2 is in a closed state. The alarm module T3 is composed of an alarm relay, a buzzer and/or an indicator light. It can be understood that the existing distributed control system DCS on the original water feeding pump rotating speed control system can be utilized, on one hand, the actual rotating speed of the water feeding pump is collected, the electromagnetic valve T2 is used for alarming, and on the other hand, the speed increasing and the speed reducing of an operator are made and sent to the water feeding pump control system. When a power-off fault occurs, the position-keeping electromagnetic valve T2 sends DCS signals to disappear, and an alarm is generated after the DCS is negated.
It can be understood that, in the first embodiment of the present invention, the feed pump rotational speed maintaining device is provided with a power interface card for connecting the first dc power supply U1 and the second dc power supply U2,
in a second embodiment of the present invention, a system for controlling a rotational speed of a feed pump is further provided, which includes the device for maintaining a rotational speed of a feed pump in the first embodiment of the present invention. In the feed-water pump rotational speed control system in the second embodiment of the present invention, a feed-water pump rotational speed maintaining device in the first embodiment of the present invention is added on the basis of the original feed-water pump rotational speed control system, as shown in fig. 3. In fig. 3, 1 is PLC, 2 is a spoon position control mechanism, and 3 is a spoon 3/21 is an electromagnetic force regulator, 22 is a 4/3 electromagnetic valve, 23 is a hydraulic oil cylinder, 24 is a piston, 25 is a scoop tube position sensor, A is an oil inlet tube and B is an oil outlet tube. At this time, the first direct-current power supply and the second direct-current power supply in the water-feeding pump rotation speed holding device in the second embodiment of the present invention both use a power supply responsible for supplying power to the PLC, and as long as the PLC power supply fails, the position-maintaining electromagnetic valve in the water-feeding pump rotation speed holding device is de-energized and closed, and the oil path is cut off to maintain the rotation speed of the water-feeding pump.
Since the water-feeding pump rotation speed maintaining device in the second embodiment of the present invention and the water-feeding pump rotation speed maintaining device in the first embodiment of the present invention have the same structure and connection relationship, please refer to the foregoing contents, and details are not repeated herein.
The embodiment of the invention has the following beneficial effects:
according to the invention, under the power failure mode of a water supply pump control system (PLC) (such as when the power supply which is responsible for supplying power to the PLC fails or the power supply which is used for controlling power supply to the PLC fails), the relay is driven to lose magnetism, the position-keeping electromagnetic valve loses power and restores to an initial closed state, and the oil way is cut off, so that the position of the scoop tube is not changed to ensure that the speed of the water supply pump is maintained, thus the problems that the rotating speed of the water supply pump cannot be maintained and the water supply fluctuates greatly due to the fact that the scoop tube restores to an initial set position under the power supply failure mode of the PLC are solved, and.
While the invention has been described in connection with what is presently considered to be the most practical and preferred embodiment, it is to be understood that the invention is not to be limited to the disclosed embodiment, but on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.
Claims (7)
1. A feed pump rotating speed keeping device is used on a feed pump rotating speed control system comprising a PLC, a spoon pipe position control mechanism and a spoon pipe, wherein the spoon pipe position control mechanism comprises an electromagnetic force regulator, a 4/3 electromagnetic valve, a hydraulic oil cylinder, a piston and a spoon pipe position sensor; the device is characterized by comprising a driving relay and a position-keeping electromagnetic valve; wherein the content of the first and second substances,
the control end of the driving relay is connected with a first direct-current power supply, and a normally open contact on the driving relay is connected between the position-keeping electromagnetic valve and a second direct-current power supply and connects the position-keeping electromagnetic valve and the second direct-current power supply in series to form a loop; the position-keeping electromagnetic valve is arranged on an oil inlet pipe and an oil discharge pipe between the 4/3 electromagnetic valve and the hydraulic oil cylinder; the first direct-current power supply and the second direct-current power supply are the same power supply or different power supplies, and the first direct-current power supply is a power supply responsible for supplying power to the PLC or a power supply controlled by the PLC;
when the first direct-current power supply fails, the normally open contact of the driving relay is disconnected, a loop between the position-keeping electromagnetic valve and the second direct-current power supply is cut off, the position-keeping electromagnetic valve cannot receive the normal power supply of the second direct-current power supply and is in a closed state, the oil inlet amount and the oil discharge amount between the 4/3 electromagnetic valve and the hydraulic oil cylinder are cut off, and the rotating speed of the water feeding pump is kept.
2. The feed pump rotation speed maintaining device as claimed in claim 1, wherein when the second direct current power supply fails, the position-keeping electromagnetic valve is de-energized and directly reset to a closed state, and the oil inlet amount and the oil discharge amount between the 4/3 electromagnetic valve and the hydraulic oil cylinder are cut off, so that the rotation speed of the feed pump is maintained.
3. The device for maintaining the rotating speed of the feed pump as claimed in claim 2, wherein the power supply controlled by the PLC is a power supply with voltage output controlled by the PLC through self-checking or detecting the feedback condition of the position of the spoon collected by the position sensor of the spoon.
4. The apparatus for maintaining the rotational speed of a feed-water pump as claimed in claim 3, wherein said drive relay is an intermediate relay; the position-keeping electromagnetic valve is a two-position four-way electromagnetic valve.
5. The feed pump rotational speed maintenance device according to claim 4, further comprising: the alarm module is connected with the position-keeping electromagnetic valve; and the alarm module is used for giving an alarm when the position-keeping electromagnetic valve is in a closed state.
6. The rotational speed maintaining device of a feed water pump as claimed in claim 5, characterized in that the alarm module is composed of an alarm relay, a buzzer and/or an indicator light.
7. A feed water pump rotational speed control system, characterized by comprising a feed water pump rotational speed maintaining device according to any one of claims 1 to 6.
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| Application Number | Priority Date | Filing Date | Title |
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| 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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| Application Number | Priority Date | Filing Date | Title |
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| 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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| CN109915351A CN109915351A (en) | 2019-06-21 |
| CN109915351B true CN109915351B (en) | 2020-09-18 |
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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 |
|---|
| 岭澳二期核电站电动主给水泵系统调速原理的改进;牛云等;《核科学与工程》;20190228;第39卷(第1期);第78-82页 * |
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