CN218862880U - Control system for realizing frequency automatic tracking by parallel operation of variable frequency pumps - Google Patents
Control system for realizing frequency automatic tracking by parallel operation of variable frequency pumps Download PDFInfo
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- CN218862880U CN218862880U CN202222708068.8U CN202222708068U CN218862880U CN 218862880 U CN218862880 U CN 218862880U CN 202222708068 U CN202222708068 U CN 202222708068U CN 218862880 U CN218862880 U CN 218862880U
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Abstract
The utility model discloses a control system for realizing frequency automatic tracking by parallel operation of variable frequency pumps, which comprises a plurality of variable frequency pumps, a water supply controller and a water pressure detection device; the water supply controller is respectively connected with a plurality of variable frequency water pumps running in parallel and a water pressure detection device; a water pressure set value, an upper limit frequency and a lower limit frequency are preset in the water supply controller, and the working frequency of the variable-frequency water pump is adjusted between the upper limit frequency and the lower limit frequency; the water supply controller compares frequency conversion water pump operating frequency with upper limit frequency and lower limit frequency respectively to according to opening of a plurality of frequency conversion water pumps of comparative result control parallel operation and stopping quantity, the utility model discloses can realize the automatically regulated of house steward pressure through the PID closed-loop control of frequency conversion water pump, the operating frequency of water pump when can also the automatic memory trip when the operating pump trips to set for the target frequency of starting the pump with this frequency automatic, reach effectual constant voltage water supply and energy-conserving purpose.
Description
Technical Field
The utility model relates to a parallelly connected technical field of frequency conversion water pump group specifically is a frequency conversion pump parallel operation realizes frequency automatic tracking's control system.
Background
With the increasing maturity of frequency converter technology and the continuous decline of price, the application occasion of frequency converter is expanding continuously. At present, in a water supply system of a large building and a production factory, the traditional system configuration mode of parallel operation of a plurality of constant speed pumps or parallel operation of a plurality of constant speed pumps and a variable frequency water pump is gradually replaced by the mode of parallel water supply of a plurality of variable frequency speed control water pumps.
A water pressure sensor is arranged on a common water supply system with a plurality of variable-frequency water pumps, wherein the water pressure sensor is close to the tail end of a water supply main pipe or at the most unfavorable point of the system, and the rotating speed of the water pumps and the number of the water pumps put into operation are changed in a PID closed-loop regulation mode according to the deviation of the water pressure sensor and a set value, so that the reading stability of the water pressure sensor is maintained, and the stable water supply of the whole system is ensured.
However, when one water pump in the parallel variable-frequency water pump set trips due to a fault or the water pump is stopped manually, the other water pump started in an interlocking manner cannot remember the frequency of the frequency converter during the pump stopping process, the target frequency of the water pump cannot be automatically set, and the stability of the water pressure cannot be maintained.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a frequency conversion pump parallel operation realizes frequency automatic tracking's control system to solve the problem that proposes among the above-mentioned background art.
In order to achieve the above object, the utility model provides a following technical scheme: a control system for realizing frequency automatic tracking by parallel operation of variable frequency pumps comprises a plurality of variable frequency pumps, a water supply controller and a water pressure detection device; the water supply controller is respectively connected with a plurality of variable frequency water pumps running in parallel and the water pressure detection device; the water pressure detection device is arranged at the output end of the water pipe and used for detecting the water pressure in the water pipe in real time; the variable frequency water pump is used for providing power for water flow in the water pipe; a water pressure set value, an upper limit frequency and a lower limit frequency are preset in the water supply controller, and the working frequency of the variable-frequency water pump is adjusted between the upper limit frequency and the lower limit frequency; the water supply controller compares the detection value of the water pressure detection device with a water pressure threshold value and controls the variable-frequency water pump to work according to the comparison result; and the water supply controller acquires the working frequency of the variable-frequency water pump in real time, compares the working frequency of the variable-frequency water pump with the upper limit frequency and the lower limit frequency respectively, and controls the starting number of the frequency converters according to the comparison result.
Furthermore, the variable frequency water pump consists of a variable frequency motor and a water pump.
Further, the water pump adopts a centrifugal pump.
Further, the water supply controller adopts a PID controller.
Compared with the prior art, the beneficial effects of the utility model are that:
the utility model discloses compare traditional inverter pump and move side by side, the utility model discloses not only can realize house steward's hydraulic PID automatically regulated, trip among an inverter pump operation process, the operating frequency of water pump when the procedure in the water supply controller can automatic memory trip to set for the target frequency who allies oneself with the pump with this frequency automatic, make house steward's pressure resume the level before the water pump trip as early as possible, reach effectual constant voltage water supply and energy-conserving purpose
Drawings
FIG. 1 is a schematic diagram of a control system for realizing frequency automatic tracking when variable frequency pumps are operated in parallel according to the present invention;
fig. 2 is a control logic diagram of the control system for realizing frequency automatic tracking in parallel operation of the variable frequency pumps of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts all belong to the protection scope of the present invention.
As shown in fig. 1 and 2, a control system for realizing frequency automatic tracking by parallel operation of variable frequency pumps comprises a plurality of variable frequency pumps, a water supply controller and a water pressure detection device; the variable-frequency water pumps are arranged in parallel, and the water supply controller is respectively connected with the variable-frequency water pumps and the water pressure detection device which are operated in parallel;
the water pressure detection device is arranged at the output end of the water pipe and used for detecting the water pressure in the water pipe in real time; the variable frequency water pump is used for providing power for water flow in the water pipe; a water pressure set value, an upper limit frequency and a lower limit frequency are preset in the water supply controller, and the working frequency of the variable-frequency water pump is adjusted between the upper limit frequency and the lower limit frequency; the water supply controller compares the working frequency of the variable-frequency water pumps with the upper limit frequency and the lower limit frequency respectively, and controls the number of the start-stop of a plurality of variable-frequency water pumps running in parallel according to the comparison result.
In the embodiment, the working frequency of the variable-frequency water pump reaches the upper limit frequency, and the water supply controller is additionally provided with one variable-frequency water pump to work; when the working frequency of the variable-frequency water pump reaches the lower limit frequency, the water supply controller stops the variable-frequency water pump in a working state, and when the variable-frequency water pump is added to the water supply controller to work, the other variable-frequency water pumps perform frequency reduction at the same speed as the frequency increasing speed of the newly added variable-frequency water pump in the starting process of the newly added variable-frequency water pump; when the water supply controller stops the variable-frequency water pump in a working state, in the stopping process of the pump, the other variable-frequency water pumps perform frequency increase at the speed same as the pump frequency decreasing speed.
In this embodiment, when one variable frequency water pump trips during operation, the program in the water supply controller automatically memorizes the operating frequency of the water pump at the time of tripping, and automatically sets the frequency as the target frequency for starting the pump, so that the pressure of the main pipe is restored to the level before the water pump trips as soon as possible.
In this embodiment, the variable frequency water pump is composed of a variable frequency motor and a water pump.
In this embodiment, the water pump is a centrifugal pump.
In the present embodiment, the water supply controller employs a PID controller.
The utility model provides an among the new variable frequency water pump interlock control system, the water supply controller carries out the comparison with water pressure detection device detected value and water pressure setting value to according to the work of comparative result control variable frequency water pump, adjust water pressure in real time through the variable frequency water pump promptly. And the water supply controller acquires the working frequency of the variable-frequency water pump in real time, compares the working frequency of the variable-frequency water pump with the upper limit frequency and the lower limit frequency respectively, and controls the starting number of the variable-frequency water pumps according to the comparison result to avoid the working frequency of the variable-frequency water pump exceeding the limit value.
Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments or portions thereof without departing from the spirit and scope of the invention.
Claims (4)
1. The utility model provides a control system that inverter pump parallel operation realized frequency automatic tracking which characterized in that: the system comprises a plurality of variable frequency water pumps, a water supply controller and a water pressure detection device; the water supply controller is respectively connected with the plurality of variable frequency water pumps running in parallel and the water pressure detection device;
the water pressure detection device is arranged at the output end of the water pipe and is used for detecting the water pressure in the water pipe in real time; the variable frequency water pump is used for providing power for water flow in the water pipe; a water pressure set value, an upper limit frequency and a lower limit frequency are preset in the water supply controller, and the working frequency of the variable-frequency water pump is adjusted between the upper limit frequency and the lower limit frequency; and the water supply controller compares the working frequency of the variable-frequency water pumps with the upper limit frequency and the lower limit frequency respectively and controls the number of the start-stop of a plurality of variable-frequency water pumps running in parallel according to the comparison result.
2. The control system for realizing frequency automatic tracking by the parallel operation of the variable frequency pumps as claimed in claim 1, wherein: the variable-frequency water pump consists of a variable-frequency motor and a water pump.
3. The control system for realizing frequency automatic tracking by the parallel operation of the variable frequency pumps as claimed in claim 2, wherein: the water pump adopts a centrifugal pump.
4. The control system for realizing the automatic frequency tracking of the parallel operation of the variable-frequency pumps as claimed in claim 1, characterized in that: and the water supply controller adopts a PID controller.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222708068.8U CN218862880U (en) | 2022-10-14 | 2022-10-14 | Control system for realizing frequency automatic tracking by parallel operation of variable frequency pumps |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222708068.8U CN218862880U (en) | 2022-10-14 | 2022-10-14 | Control system for realizing frequency automatic tracking by parallel operation of variable frequency pumps |
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| Publication Number | Publication Date |
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| CN218862880U true CN218862880U (en) | 2023-04-14 |
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| CN202222708068.8U Active CN218862880U (en) | 2022-10-14 | 2022-10-14 | Control system for realizing frequency automatic tracking by parallel operation of variable frequency pumps |
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| CN (1) | CN218862880U (en) |
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2022
- 2022-10-14 CN CN202222708068.8U patent/CN218862880U/en active Active
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