CN210603481U - Detection apparatus for high-order water tank liquid level of laminar flow based on flow calculation - Google Patents
Detection apparatus for high-order water tank liquid level of laminar flow based on flow calculation Download PDFInfo
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- CN210603481U CN210603481U CN201921590033.0U CN201921590033U CN210603481U CN 210603481 U CN210603481 U CN 210603481U CN 201921590033 U CN201921590033 U CN 201921590033U CN 210603481 U CN210603481 U CN 210603481U
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Abstract
A detection device for calculating the liquid level of a laminar flow high-level water tank based on flow belongs to the technical field of automatic control. In order to solve the severe fluctuation of the liquid level of the water tank and protect the stable operation of the production line. The device comprises a monitor, a programmable controller, an analog input unit, a water tank inlet flowmeter, a water tank outlet flowmeter and a drop-in liquid level meter; the monitor is connected with the controller which can be numbered, the programmable controller is connected with the analog input unit, and the analog input unit is respectively connected with the water inlet flowmeter, the water outlet flowmeter and the input liquid level meter of the water tank. The system is simple, convenient to use and simple to maintain.
Description
Technical Field
The utility model belongs to the technical field of automatic control, especially, provide a detection device based on flow totalizing value calculates laminar flow high-order water tank liquid level, avoid the violent undulant of water tank liquid level, protect the steady operation of production line.
Background
The purpose of the laminar flow high-level water tank is to store and provide cooling water for the laminar flow cooling system. The cooling water is first conveyed to the tank of the high level water tank of about 10 meters through a pipeline for storage, and when the laminar cooling needs the water, the cooling water with certain pressure generated by the height difference is provided.
In practical application, the laminar flow high-level water tank adopts a drop-in type liquid level meter, and the pump set adopts a liquid level PID control mode according to a liquid level value; the original design water tank is smaller, in order to meet production requirements, the PID value of the liquid level of the water tank can only be set to be as high as possible, but because the flow of the water tank during water inlet and outlet is larger, the liquid level value can fluctuate violently along with the liquid level meter, the corresponding liquid level can fluctuate violently, the frequency of the pump set fluctuates violently, and the water storage capacity of the water tank is insufficient or the water level is too high to cause overflow. Affecting the stable operation of the production line.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide an utilize device of flow calculation liquid level, through to the laminar flow water tank advance, go out the method that the water flow totalizing value calculated the water tank liquid level and ensure when the input level gauge is undulant, can keep laminar flow water tank liquid level steady, prevent to appear because the not enough or too high appearance that leads to the overflow phenomenon of water tank water storage that the violent fluctuation of level gauge leads to.
The utility model discloses a theory of operation is: calculating the accumulated amount of water inlet and outlet flow of the water tank, and dividing the difference of the accumulated amount of water inlet and outlet by the bottom area of the water tank to obtain the liquid level height detected by the flow accumulated value; when the water inlet flow and the water outlet flow of the water tank are small, the liquid level fluctuation is small, and the value of the input type liquid level meter is relatively accurate. And further correcting the liquid level value detected by the flow integrated value by using the value of the input liquid level when the water inlet flow and the water outlet flow are small, and finally obtaining a more accurate liquid level.
A detection device for calculating the liquid level of a laminar flow high-level water tank based on flow comprises a monitor, a programmable controller, an analog input unit, a water tank inlet flow meter, a water tank outlet flow meter and an input type liquid level meter; the monitor is connected with the controller which can be numbered, the programmable controller is connected with the analog input unit, and the analog input unit is respectively connected with the water inlet flowmeter, the water outlet flowmeter and the input liquid level meter of the water tank.
The utility model has the advantages of, the system is succinct, convenient to use, and it is simple to maintain.
Drawings
Fig. 1 is the utility model discloses laminar flow high-order water tank liquid level detection device wiring diagram based on flow.
The device comprises a monitor 1, a programmable controller 2, a module quantity input device 3, a water tank water inlet flow meter 4, a water tank water outlet flow meter 5 and a drop-in liquid level meter 6.
FIG. 2 is a flow chart of the process control of the device for detecting the level of a laminar high-level water tank based on flow.
Detailed Description
The programmable controller is Siemens S7-300, the input of the analog input unit is 4-20mA, and the monitor adopts Siemens WINCC. 4-20mA signals generated by the electromagnetic flowmeter of the water tank and the input type liquid level meter are transmitted to the programmable controller through the analog quantity input module, the programmable controller calculates the liquid level of the water outlet tank according to the accumulated value of the inlet and outlet flowmeters of the water tank and the bottom area of the water tank, a final liquid level value is obtained through a series of judgment and correction, and the frequency converter performs PID (proportion integration differentiation) regulation control on the liquid level according to the liquid level value. The monitor is connected with the programmable controller through the Ethernet. And respectively displaying the value of the drop-in liquid level calculated by the system and the liquid level value calculated by the flowmeter on a WINCC picture.
1. Collecting the accumulated value of the inlet and outlet water flow of the laminar high-level water tank by taking 10ms as a period;
2. calculating the bottom area of the laminar flow water tank;
3. calculating the liquid level height according to the accumulated value of the water inlet flow and the water outlet flow of the water tank and the bottom area of the laminar flow water tank;
4. correcting a liquid level value;
when the water inlet and outlet flow values of the water tank are smaller than a certain value and continue for a period of time, the deviation between the level value measured by the flowmeter and the level value measured by the drop-in type liquid level meter is within a certain range, and the level value of the liquid level meter corrects the level value measured by using the flow; when the deviation exceeds a certain value, the system gives an alarm to provide handling for operators;
5. making an upper WINCC picture, and displaying an integrated value of water inlet and outlet flow of the water tank on the picture; displaying the input level value and the accumulated value measured by the flowmeter;
6. and carrying out PID (proportion integration differentiation) regulation on the liquid level of the water tank by utilizing the final liquid level value.
Claims (1)
1. A detection device for calculating the liquid level of a laminar flow high-level water tank based on flow is characterized by comprising a monitor, a programmable controller, an analog quantity input device, a water tank inlet flow meter, a water tank outlet flow meter and an input type liquid level meter; the monitor is connected with the controller which can be numbered, the programmable controller is connected with the analog input unit, and the analog input unit is respectively connected with the water inlet flowmeter, the water outlet flowmeter and the input liquid level meter of the water tank.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921590033.0U CN210603481U (en) | 2019-09-23 | 2019-09-23 | Detection apparatus for high-order water tank liquid level of laminar flow based on flow calculation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921590033.0U CN210603481U (en) | 2019-09-23 | 2019-09-23 | Detection apparatus for high-order water tank liquid level of laminar flow based on flow calculation |
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| CN210603481U true CN210603481U (en) | 2020-05-22 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201921590033.0U Active CN210603481U (en) | 2019-09-23 | 2019-09-23 | Detection apparatus for high-order water tank liquid level of laminar flow based on flow calculation |
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| CN (1) | CN210603481U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112179457A (en) * | 2020-09-29 | 2021-01-05 | 中国船舶重工集团公司第七二四研究所 | Fault detection and reconstruction method for liquid level system of water-cooling cabinet |
| CN113477728A (en) * | 2021-06-17 | 2021-10-08 | 首钢集团有限公司 | Measuring device, and system and method for detecting nozzle flow of laminar flow cooling header |
-
2019
- 2019-09-23 CN CN201921590033.0U patent/CN210603481U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112179457A (en) * | 2020-09-29 | 2021-01-05 | 中国船舶重工集团公司第七二四研究所 | Fault detection and reconstruction method for liquid level system of water-cooling cabinet |
| CN113477728A (en) * | 2021-06-17 | 2021-10-08 | 首钢集团有限公司 | Measuring device, and system and method for detecting nozzle flow of laminar flow cooling header |
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