CN213699119U - Control system of double-speed rotary filter screen - Google Patents
Control system of double-speed rotary filter screen Download PDFInfo
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- CN213699119U CN213699119U CN202021910566.5U CN202021910566U CN213699119U CN 213699119 U CN213699119 U CN 213699119U CN 202021910566 U CN202021910566 U CN 202021910566U CN 213699119 U CN213699119 U CN 213699119U
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Abstract
The utility model discloses a control system of a double-speed rotary filter screen, which comprises an upstream liquid level sensor, a downstream liquid level sensor, a liquid level meter, a PLC control unit of the rotary filter screen, an alarm and a time relay; the rotary filter screen is provided with an upstream liquid level sensor and a downstream liquid level sensor, the rotary filter screen adopts a low-high-speed double-speed motor, the upstream liquid level sensor and the downstream liquid level sensor are respectively connected with a liquid level meter, and the liquid level meter, an alarm, a time relay and the low-high-speed double-speed motor are respectively connected with a PLC control unit of the rotary screen. The system has the advantages of automatic switching of the low-speed and high-speed motor, large water flow, intelligence, long service life of equipment, stable performance, high efficiency, reliability and the like.
Description
Technical Field
The utility model belongs to the technical field of power station circulating water filtration system, a control system of double speed rotary filter screen is related to.
Background
The rotary filter screen is the main equipment of the power station circulating water filtering system, and is used for intercepting and removing the dirt which is larger than the diameter size of the mesh and filtered by the coarse grating in the seawater, so that the water consumption of the power station is guaranteed.
The conventional rotary filter screen adopts a single-speed motor, has the characteristics of simple structure and single function, but cannot deal with the conditions of much seawater and sewage and severe field environment, has the defects of low water passing amount and low efficiency, and even has the possibility of sudden increase of marine life, the pressure of the rotary filter screen increases steeply, and equipment has the risk of damage.
SUMMERY OF THE UTILITY MODEL
In view of this, the utility model discloses a control system of double speed rotary filter screen is provided, can adopt two kinds of speed operation of low-speed, high speed according to the quantity of filth, improve sea water filtration efficiency;
the purpose of the utility model can be realized by the following technical scheme:
a control system of a double-speed rotary filter screen comprises an upstream liquid level sensor, a downstream liquid level sensor, a liquid level meter, a PLC control unit of the rotary filter screen, an alarm and a time relay; the rotary filter screen is provided with an upstream liquid level sensor and a downstream liquid level sensor, the rotary filter screen adopts a low-high-speed double-speed motor, the upstream liquid level sensor and the downstream liquid level sensor are respectively connected with a liquid level meter, and the liquid level meter, an alarm, a time relay and the low-high-speed double-speed motor are respectively connected with a PLC control unit of the rotary screen.
And a storage is arranged in the liquid level meter.
And a timer is arranged in the PLC control unit of the rotating network.
The utility model has the advantages that:
the utility model provides a control system of double speed rotary filter screen, it is little to use this system to show the on-the-spot water yield of having improved the power plant, inefficiency, the shortcoming that equipment opened and stops repeatedly, can realize the double speed adjustment, the liquid level returns the poor, the liquid level reduces, rotary filter screen time delay stops the net, regularly start, the operation of high-speed operation when the liquid level difference is high, the shortcoming that current single-speed rotary filter screen water capacity is low has been overcome, have low-speed high-speed motor automatic switch-over, the water capacity is big, intelligence, equipment long service life, stable performance, high efficiency, reliable advantage.
Drawings
The present invention will be further described with reference to the accompanying drawings.
FIG. 1 is a schematic diagram of a control system for a two-speed rotary screen according to the present invention;
FIG. 2 is a schematic view of the electrical principle of the two-speed motor of the rotary strainer of the present invention;
FIG. 3 is a schematic view of the flow of the rotary strainer during low-speed control according to the present invention;
FIG. 4 is a schematic view of the flow of the rotary strainer of the present invention during high-speed control;
fig. 5 is a schematic view of the flow of the rotary screen in timing control according to the present invention.
Detailed Description
Please refer to fig. 1-5, which are described in detail with reference to the following embodiments:
in order to solve the problems that the conventional rotary filter screen adopts a single-speed motor, cannot cope with the conditions of much seawater and dirt, severe field environment, low water passing amount and low efficiency, the embodiment provides a control system of a double-speed rotary filter screen, which comprises an upstream liquid level sensor 1, a downstream liquid level sensor 2, a liquid level meter 3, a rotary filter screen PLC control unit 4, an alarm 5 and a time relay 8; the rotary filter screen is provided with an upstream liquid level sensor 1 and a downstream liquid level sensor 2, the rotary filter screen adopts a low-high-speed double-speed motor 9, the upstream liquid level sensor 1 and the downstream liquid level sensor 2 are respectively connected with a liquid level meter 3, and the liquid level meter 3, an alarm 5, a time relay 8 and the low-high-speed double-speed motor 9 are respectively connected with a rotary screen PLC control unit.
Use the system that this embodiment provided, realize the liquid level return difference setting, specifically do:
the rotary filter screen is provided with an upstream liquid level sensor and a downstream liquid level sensor, so that the liquid levels in front of and behind the rotary filter screen are detected, information is transmitted to the liquid level meter 3, and the liquid level meter 3 calculates the difference between the upstream liquid level and the downstream liquid level; the liquid level meter instrument is connected with the storage 6, information such as liquid level difference high start threshold, close threshold is stored in the storage 6, the liquid level meter instrument 3 transmits a liquid level difference signal to the rotary network PLC control unit 4, when the liquid level in front of the network is 100mm higher than the liquid level behind the network, the liquid level difference high alarm is sent, the rotary network PLC control unit 4 controls the rotary network to run at a low speed, when the liquid level in front of the network is 200mm higher than the liquid level behind the network, the liquid level difference high alarm is sent through the alarm 5, and the rotary network PLC control unit 4 controls the rotary network to run at a high speed.
Due to the fact that the amount of floating objects on the sea surface is large and the fluctuation characteristic of water is high, the rotary filter screen can be started and stopped frequently, repeatedly and repeatedly, and the service life of equipment is influenced. The liquid level difference is stored in the storage 6 in the liquid level meter 3, the starting threshold and the closing threshold are high, for example, the liquid level starting threshold for starting the rotary filter screen to run at a low speed is set to be 100mm, and the liquid level stopping threshold for stopping the rotary filter screen to run at a low speed is set to be 20mm-50mm (adjusted according to field conditions and conditions), so that frequent starting and stopping of equipment can be effectively avoided, and the service life of the equipment is prolonged. Similarly, the starting threshold and the stopping threshold of the liquid level running at high speed are respectively set to be 200mm and 20mm-50mm (adjusted according to the field working condition and according to the situation).
TABLE 1 liquid level threshold setting
| Threshold setting | Liquid level start threshold | Liquid level stop threshold |
| High and low liquid level difference operation | 100mm | 20mm-50mm |
| High liquid level difference and high-speed operation | 200mm | 20mm-50mm |
The system provided by the embodiment is applied to realize low-speed and high-speed control, and specifically comprises the following steps:
as shown in the flow charts of fig. 3 and 4, a low-high speed double-speed motor is used as the power of the rotary filter screen, and under the normal operation condition, when the rotary screen PLC control unit receives a liquid level difference high signal sent by the liquid level meter 3, the other contactors are controlled to be switched off, the 041UM1 contactor is switched on, the rotary filter screen operates at a low speed, and the rising speed of the screen plate is about 1.8 m/min. If the dirt in front of the rotary filter screen is increased, when the PLC control unit 4 of the rotary screen receives a liquid level difference high signal sent by the liquid level meter 3, other contactors are controlled to be switched off, 041UMB and 041UMC contactors are switched on, the rotary filter screen is switched to operate at a high speed, and the net plate rises by about 3.6 m/min. If an operator operates the reverse inching button of the panel of the rotary-net electric control cabinet on site, the rotary-net PLC control unit controls other contactors to be switched off, and the 041UM2 contactor is switched on. The electrical schematic of a rotary screen two-speed motor is shown in figure 2.
The system provided by the embodiment is applied to realize the delayed network stop, and specifically comprises
Along with the operation of rotary filter screen, the filth reduces step by step in front of the net, when reaching the liquid level and stopping the threshold value, does not stop rotary filter screen immediately, and rotary filter screen PLC the control unit 4 passes through the settlement of timer 7, and control rotary filter screen stops after continuing to operate for 30 minutes again, more clears away the filth, can effectual improvement water yield and blowdown effect, also is favorable to protective apparatus, increase of service life.
High speed operation to stop net
The rotary screen PLC control unit 4 is connected with the timer 7, if the rotary screen PLC control unit receives a liquid level difference height signal sent by the liquid level meter, namely the net passing pressure difference of the rotary filter screen is larger than 200mm, the rotary screen PLC control unit controls other contactors to be disconnected, and 041UMB and 041UMC contactors are closed, so that the rotary screen is switched to high-speed operation. Considering the fluctuation characteristics of marine life, seawater floaters and water, a control mode that the high-speed operation of the rotary filter screen is switched to the low-speed operation and the screen is stopped at last along with the reduction of the net passing pressure difference is not adopted; and the high-speed operation is carried out until the network is stopped, namely when the liquid level difference is reduced to 100mm from 200mm, the rotating network PLC control unit still keeps the high-speed control scheme, other contactors are disconnected, 041UMB and 041UMC contactors are closed, and the rotating network PLC control unit controls the rotating network to continuously operate for 30 minutes by setting a timer 7 connected with the rotating network PLC control unit until the liquid level difference detected by the liquid level meter is reduced to 20mm-50mm, and then all contactors are disconnected, and the high-speed operation is stopped. The valve scheme can improve the sewage discharge effect and improve the circulating water filtering effect.
Timed start
As shown in figure 5, the rotary filter screen is an intermittent operation device, when the condition that the pressure difference of the filter screen is high does not exist, the device cannot be triggered to operate, but the dirt can be accumulated on the net sheet of the rotary filter screen due to long-time seawater filtration, and if the dirt is not cleaned in time, the difficulty in pollution discharge can be increased, and the filtering effect is influenced.
This embodiment uses this system to adopt the mode that liquid level differential pressure control and timing control combined together, and by the low-speed, high-speed operation of cross net liquid level differential pressure control equipment under the normal condition, when not having the condition that cross net differential pressure is high for a long time, through time relay 8, set up the timing interval, this system time relay sets up to send the pulse signal that the timing time arrived for rotary network PLC control unit every 4 hours. After receiving the timing pulse signal, the PLC control unit 4 of the rotary screen starts the rotary screen at regular time for 30 minutes by setting the timer 7. Regularly clear up the filth, can avoid equipment not to operate for a long time, the defect of equipment rigidity can effectively reduce the filth, improves the filter effect, extension equipment life.
The utility model provides a pair of intelligent control system of double speed rotary filter screen, it is little to improve the on-the-spot water yield of power plant, low efficiency, the shortcoming that equipment opened and stop repeatedly, from low high-speed double speed motor configuration, high-speed operation is up to stopping the net when liquid level difference is high, the liquid level return difference sets up, the net is stopped in the time delay, regularly start 5 aspects, rotary filter screen's control system has been designed, it is low to have overcome current single-speed rotary filter screen water yield, equipment is frequent, many times, stop when opening when relapseing, influence equipment life's shortcoming, low-speed high speed motor automatic switch has, the water yield is big, intelligence, equipment long service life, stable performance, high efficiency, reliable advantage.
The foregoing is merely exemplary and illustrative of the structure of the invention, and various modifications, additions and substitutions as described in the detailed description may be made by those skilled in the art without departing from the structure or exceeding the scope of the invention as defined in the claims.
Claims (3)
1. A control system of a double-speed rotary filter screen is characterized by comprising an upstream liquid level sensor, a downstream liquid level sensor, a liquid level meter, a PLC control unit of the rotary filter screen, an alarm and a time relay; the rotary filter screen is provided with an upstream liquid level sensor and a downstream liquid level sensor, the rotary filter screen adopts a low-high-speed double-speed motor, the upstream liquid level sensor and the downstream liquid level sensor are respectively connected with a liquid level meter, and the liquid level meter, an alarm, a time relay and the low-high-speed double-speed motor are respectively connected with a PLC control unit of the rotary screen.
2. The control system for a two speed rotary screen of claim 1 wherein the level gauge is coupled to a memory.
3. The control system for a two-speed rotary screen of claim 1, wherein said PLC control unit of the rotary screen is further connected to a timer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021910566.5U CN213699119U (en) | 2020-09-04 | 2020-09-04 | Control system of double-speed rotary filter screen |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021910566.5U CN213699119U (en) | 2020-09-04 | 2020-09-04 | Control system of double-speed rotary filter screen |
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| CN213699119U true CN213699119U (en) | 2021-07-16 |
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| CN202021910566.5U Active CN213699119U (en) | 2020-09-04 | 2020-09-04 | Control system of double-speed rotary filter screen |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113599900A (en) * | 2021-08-19 | 2021-11-05 | 无锡市太湖电力成套设备有限公司 | Control method and system for rotary filter screen |
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- 2020-09-04 CN CN202021910566.5U patent/CN213699119U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113599900A (en) * | 2021-08-19 | 2021-11-05 | 无锡市太湖电力成套设备有限公司 | Control method and system for rotary filter screen |
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