CN210776334U - Liquid level control system - Google Patents
Liquid level control system Download PDFInfo
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- CN210776334U CN210776334U CN201921965164.2U CN201921965164U CN210776334U CN 210776334 U CN210776334 U CN 210776334U CN 201921965164 U CN201921965164 U CN 201921965164U CN 210776334 U CN210776334 U CN 210776334U
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- 239000007788 liquid Substances 0.000 title claims abstract description 161
- 239000012530 fluid Substances 0.000 claims abstract description 5
- 230000001105 regulatory effect Effects 0.000 claims description 23
- 238000012544 monitoring process Methods 0.000 claims description 7
- 238000011144 upstream manufacturing Methods 0.000 claims description 7
- 238000000926 separation method Methods 0.000 claims 1
- 239000002351 wastewater Substances 0.000 abstract description 29
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 14
- 230000009471 action Effects 0.000 abstract description 3
- 239000002699 waste material Substances 0.000 abstract description 3
- 238000006073 displacement reaction Methods 0.000 description 5
- 238000012423 maintenance Methods 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000003139 buffering effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 210000002445 nipple Anatomy 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000008707 rearrangement Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000004065 wastewater treatment Methods 0.000 description 1
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Abstract
The utility model relates to a water treatment technical field discloses a liquid level control system. The fluid level control system comprises: separating pools; the main tank is used for collecting liquid in the branch tanks, and the liquid level of the main tank is lower than that of the branch tanks; the sub-tanks are communicated with the main tank through the siphon pipes; and the branch pools are communicated with the main pool through the liquid discharge pump. The waste water in the branch tanks can be discharged to the main tank through the combined action of the siphon pipes and the liquid discharge pump, so that the reliability of the whole system is improved. When the waste water in the sub-tanks is at a lower liquid level, the waste water is discharged by a siphon principle, so that the waste of energy sources and the loss of a liquid discharge pump are reduced; when the waste water in the branch pool is at a higher liquid level, the waste water is discharged through the liquid discharge pump and the siphon together, the water discharge amount is increased, and the waste water in the branch pool can be kept within a certain liquid level range. In addition, if the siphon pipe cannot drain water by the siphon principle due to local air intake, the liquid discharge pump can also drain water and maintain the liquid level in time.
Description
Technical Field
The utility model relates to a water treatment technical field discloses a liquid level control system.
Background
Manufacturing facilities typically include multiple process plants, each of which produces a certain amount of wastewater during their production operations. Generally, the wastewater of each workshop is firstly discharged to a sub wastewater pond of each workshop; the sub wastewater pools have a certain buffering function, and wastewater is discharged to a main wastewater pool for subsequent treatment after being preliminarily precipitated in the sub wastewater pools.
In the prior art, the wastewater in the sub wastewater tank is generally discharged to the total wastewater tank through a drainage pump. In addition, in actual operation, the wastewater in the wastewater sub-tank needs to be kept at a certain liquid level, so that the wastewater cannot overflow and can be subjected to preliminary precipitation. In the prior art, the liquid level of the wastewater in the wastewater distributing and draining tank can be adjusted only by frequently starting and stopping the draining pump.
Wherein, use the extravagant energy of drain pump for a long time, and the drain pump frequently opens and stops, has shortened the life-span of drain pump greatly for current branch wastewater disposal basin drainage system's maintenance cost is high. Therefore, further design is required for the level adjustment and discharge of wastewater in the wastewater treatment tank.
SUMMERY OF THE UTILITY MODEL
Based on the above, an object of the utility model is to provide a liquid level control system to reduce liquid level control's operation and maintenance cost, and can realize the dynamic balance of liquid level high-efficiently.
In order to achieve the purpose, the utility model adopts the following technical proposal:
a fluid level control system comprising:
separating pools;
the main tank is used for collecting liquid in the branch tanks, and the liquid level of the main tank is lower than that of the branch tanks;
the sub-tanks are communicated with the main tank through the siphon pipes;
and the branch pools are communicated with the main pool through the liquid discharge pump.
Preferably, the siphon is provided with an adjusting valve, and the adjusting valve is used for adjusting the flow of liquid in the siphon.
Preferably, an on-off valve is respectively arranged at the upstream and the downstream of the regulating valve, and the on-off valve can open or close the siphon.
Preferably, one end of the siphon is provided with a bottom valve, and the siphon is communicated with the sub-tank through the bottom valve.
Preferably, the drain pump and the bottom valve are respectively communicated with the siphon pipe through an on-off valve.
Preferably, an ultrasonic liquid level meter is arranged above the sub-tank and used for monitoring the liquid level in the sub-tank.
Preferably, divide the pond upper cover to be equipped with and divide the pond apron, the ultrasonic wave level gauge is located divide on the pond apron.
Preferably, the drain pump is communicated with the main tank through the siphon pipe.
Preferably, the outlet of the drainage pump is communicated with the siphon through an output pipe, and the output pipe is provided with a check valve to prevent liquid in the output pipe from flowing back.
Preferably, the output pipe is further provided with a flexible connecting pipe, and the flexible connecting pipe is arranged on the upstream of the check valve.
The utility model has the advantages that:
the waste water in the branch tanks can be discharged to the main tank through the combined action of the siphon pipes and the liquid discharge pump, so that the reliability of the whole system is improved. When the waste water in the sub-tanks is at a lower liquid level, the waste water is discharged by a siphon principle, so that the waste of energy sources and the loss of a liquid discharge pump are reduced; when the waste water in the branch pool is at a higher liquid level, the waste water is discharged through the liquid discharge pump and the siphon together, the water discharge amount is increased, and the waste water in the branch pool can be kept within a certain liquid level range. In addition, if the siphon pipe cannot drain water by the siphon principle due to local air intake, the liquid discharge pump can also drain water and maintain the liquid level in time.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required to be used in the description of the embodiments of the present invention will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the contents of the embodiments of the present invention and the drawings without creative efforts.
FIG. 1 is a layout view of a fluid level control system;
FIG. 2 is a flow chart of a method of level control.
In the figure:
1-separating the pools; 10-ultrasonic level meter;
2-total pool;
3-siphon; 30-a switch valve; 31-a regulating valve; 310-a pneumatic actuator; 32-a bottom valve; 33-a hose;
4-a liquid discharge pump; 40-an output pipe; 41-check valve; 42-flexible connection pipe; 43-pressure gauge; 44-frequency converter;
5-PLC control system.
Detailed Description
In order to make the technical problems, technical solutions and technical effects achieved by the present invention more clear, the embodiments of the present invention will be described in further detail with reference to the accompanying drawings, and obviously, the described embodiments are only some embodiments, not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by those skilled in the art without creative efforts belong to the protection scope of the present invention.
Referring to fig. 1, the present embodiment provides a liquid level control system including a branch tank 1, a main tank 2, a siphon pipe 3, and a drain pump 4. The main tank 2 is used for collecting liquid in the branch tanks 1, and the liquid level of the main tank 2 is lower than that of the branch tanks 1; the branch tank 1 is communicated with the main tank 2 through a siphon 3; the branch pool 1 is communicated with the main pool 2 through a drain pump 4. The liquid discharge pump 4 is communicated with the main tank 2 through the siphon 3, so that the pipeline arrangement of the liquid level control system is simple, and cost control is facilitated.
Because the liquid level of the main tank 2 is lower than that of the branch tanks 1, the liquid in the branch tanks 1 can be discharged to the main tank 2 through the combined action of the siphon pipes 3 and the liquid discharge pump 4 according to the siphon principle, and the reliability of the whole system is improved. The siphon 3 is partially broken, the joint is not sealed tightly, or the pipe wall is provided with sand holes, so that the local air intake is caused, and if the siphon 3 is partially air intake and cannot discharge water through the siphon principle, the liquid discharge pump 4 can discharge water and keep the liquid level in time.
An ultrasonic liquid level meter 10 is arranged above the sub-tank 1, and the ultrasonic liquid level meter 10 is used for monitoring the liquid level in the sub-tank 1. Divide 1 upper cover in pond to be equipped with and divide the pond apron, ultrasonic wave level gauge 10 is located and is divided on the pond apron, can prevent to divide 1 interior entering foreign matter in pond, the installation of the ultrasonic wave level gauge 10 of being convenient for again.
During measurement, ultrasonic pulses are sent by a sensor of the ultrasonic liquid level meter 10, sound waves are reflected by the liquid surface in the sub-tank 1, received by the same sensor and converted into electric signals, and the distance from the sensor of the ultrasonic liquid level meter 10 to the surface of the measured liquid is calculated according to the time difference between the emission and the reception of the sound waves, so that the liquid level in the sub-tank 1 is obtained.
Since the ultrasonic level gauge 10 adopts a non-contact measurement form, the measured medium is almost unlimited and can be used for monitoring turbid or large-fluctuation liquid level. The ultrasonic liquid level meter 10 has high measurement precision and is suitable for a PLC monitoring system.
In this embodiment, the liquid level control system further comprises a PLC control system 5. The PLC control system 5 is used for receiving liquid level signals collected by the ultrasonic liquid level meter 10 and controlling the regulating valve 31 and the liquid discharge pump 4 according to the liquid level signals. In fig. 1, "PLC" is a PLC control system identifier, and a dotted line connecting the PLC control system 5 and the ultrasonic level meter 10 represents that the PLC control system 5 is electrically connected to the ultrasonic level meter 10.
The siphon 3 is provided with a regulating valve 31, and the regulating valve 31 is used for regulating the flow of the liquid in the siphon 3. The regulating valve 31 is a pneumatic regulating valve, can realize proportional or switching value regulation, and is characterized by simple control and quick response; the pneumatic control valve generally uses compressed air as a power source, receives a control signal of an industrial automatic control system, and adjusts parameters such as flow, pressure or liquid level of a pipeline medium by means of accessories such as a valve positioner, a converter, an electromagnetic valve, a position retaining valve, an air storage tank, an air filter and the like. In fig. 1, "M" is a pneumatic actuator identifier of the regulating valve 31, and a dotted line connecting the PLC control system 5 and the pneumatic actuator 310 represents that the PLC control system 5 is electrically connected to the pneumatic actuator 310.
The pneumatic actuator 310 of the regulating valve 31 is an actuator for opening and closing or regulating the valve core of the regulating valve 31 by air pressure, and pushes the valve core of the regulating valve 31 to act according to the control signal output by the PLC control system 5, so that a certain displacement or a certain rotation angle is generated, thereby regulating the flow rate of the fluid at a certain opening degree.
Upstream and downstream of the regulating valve 31 are respectively provided on-off valves 30, and the on-off valves 30 can open or close the siphon tube 3. By closing the on-off valves 30 upstream and downstream thereof, maintenance or replacement of the regulating valve 31 can be facilitated. Wherein, the switch valve 30 is a manual butterfly valve.
In the present embodiment, one end of the siphon tube 3 is connected to the bottom valve 32 through the hose 33, and the siphon tube 3 is connected to the sub-tank 1 through the bottom valve 32. The bottom valve 32 is a kind of check valve, and can prevent the liquid in the siphon tube 3 from flowing back to the sub-tank 1. The bottom valve 32 is provided with a light float to float on the liquid in the sub-tank 1, and the inlet of the bottom valve 32 is submerged below the liquid level in the sub-tank 1.
In this embodiment, the outlet of the drain pump 4 is connected to the siphon tube 3 through the delivery pipe 40, and the delivery pipe 40 is provided with a check valve 41 to prevent the liquid in the delivery pipe 40 from flowing back. Three liquid discharge pumps 4 are arranged, one or two of the liquid discharge pumps can be selected for liquid discharge according to actual working conditions, and the other liquid discharge pumps 4 temporarily stop liquid discharge; when the liquid level control system works, the liquid pressure in the siphon pipe 3 is higher, and the check valve 41 corresponding to the liquid discharge pump 4 for suspending liquid discharge can prevent the liquid in the siphon pipe 3 from flowing back to the sub-tank 1 from the liquid discharge pump 4 under higher pressure, so that the whole liquid level control system is more reliable.
The output pipe 40 is also provided with a flexible connecting pipe 42 and a pressure gauge 43, and the outlet of the liquid discharge pump 4 is communicated with the output pipe 40 through the flexible connecting pipe 42. The flexible nipple 42 is connected in series with the check valve 41 via the outlet pipe 40 and is arranged upstream of the check valve 41. During operation of the level control system, the positive displacement pump 4 vibrates, and the flexible pipe 42 isolates the vibration of the positive displacement pump 4 from the check valve 41 and the siphon tube 3. The pressure gauge 43 is disposed on the wall of the output pipe 40 for monitoring the pressure of the liquid in the output pipe 40.
In this embodiment, the output pipe 40 at the outlet of the drain pump 4 and the hose 33 communicating with the bottom valve 32 are each communicated with the siphon tube 3 through one on-off valve 30. When the liquid discharge pump 4 discharges liquid normally, the switch valve 30 on the hose 33 is closed, so that the maintenance and replacement of the bottom valve 32 are facilitated; when the bottom valve 32 discharges liquid normally, the switch valve 30 on the output pipe 40 is closed, so that the maintenance and the replacement of the liquid discharge pump 4 are facilitated. Wherein the on-off valve 30 on the output pipe 40 is provided downstream of the check valve 41.
In the present embodiment, the positive displacement pump 4 is a variable frequency water pump having an inverter 44 (including a PID regulator). When the liquid discharge pump 4 works in a frequency conversion mode, the water pump motor can be started in a soft start mode, the starting current gradually changes from zero, and the impact on each pipeline and each valve in the liquid level control system is reduced. In fig. 1, "INV" is a frequency converter identifier of the drainage pump 4, and a dotted line connecting the PLC control system 5 and the frequency converter 44 represents that the PLC control system 5 is electrically connected to the frequency converter 44.
The PLC control system 5 compares the liquid level signal collected by the ultrasonic liquid level meter 10 with the target liquid level and outputs a deviation signal, and then the deviation signal carries out starting, pause and rotating speed adjustment on the liquid discharge pump 4 through the frequency converter 44. The PLC control system 5 can change the rotation speed of the water pump motor by adjusting the power frequency output by the frequency converter 44, thereby performing load up-conversion control or load down-conversion control on the drainage pump 4 to adjust the flow rate of the drainage pump 4.
Referring to fig. 2, the present embodiment further provides a liquid level control method, based on the above liquid level control system, including the following steps:
setting a first liquid level value and a second liquid level value higher than the first liquid level value, and inputting the first liquid level value and the second liquid level value into a PLC control system 5; through ultrasonic wave level gauge 10, the liquid level in the monitoring branch pond 1, the liquid level signal that ultrasonic wave level gauge 10 gathered is received to PLC control system 5 to according to the deviation of current liquid level and first liquid level value and second liquid level value, control governing valve 31 and positive displacement pump 4.
If the liquid level in the sub-tank 1 is higher than the first liquid level value, a corresponding instruction is sent to the pneumatic actuator 310 through the PLC control system 5, and the regulating valve 31 is opened to open the siphon 3; if the liquid level in the sub-tank 1 is lower than the first level value, the PLC control system 5 sends a corresponding command to the pneumatic actuator 310 to close the regulating valve 31 so as to close the siphon 3.
If the liquid level in the sub-tank 1 is higher than the second liquid level value, a corresponding instruction is sent to the frequency converter 44 through the PLC control system 5, and the liquid discharge pump 4 is started to increase the liquid flow in the siphon 3; if the liquid level in the sub-tank 1 is lower than the second level value, the PLC control system 5 sends a corresponding instruction to the frequency converter 44, and the liquid discharge pump 4 is suspended to reduce the liquid flow in the siphon 3.
When the liquid in the sub-tank 1 is at a lower liquid level, the water is drained by the siphon principle, so that the waste of energy sources and the loss of the liquid drainage pump 4 are reduced; when the liquid in the sub-tank 1 is at a higher liquid level, the liquid is discharged through the liquid discharge pump 4, and the liquid discharge amount is increased, so that the liquid in the sub-tank 1 can be kept within a certain liquid level range.
Specifically, a plurality of set values are set between the first liquid level value and the second liquid level value, the flow rate of the liquid in the siphon 3 is adjusted according to the set values, and if the liquid level in the sub-tank 1 reaches the set values, the flow rate of the liquid in the siphon 3 is increased, and the liquid level in the sub-tank 1 is further controlled.
Optionally, the first liquid level value is 15% of the rated liquid level of the sub-tank 1, and the second liquid level value is 70% of the rated liquid level of the sub-tank 1. And a first set value and a second set value are arranged between the first liquid level value and the second liquid level value, the first set value is 30% of the rated liquid level of the sub-tank 1, and the second set value is 50% of the rated liquid level of the sub-tank 1.
Optionally, when the liquid level in the sub-tank 1 reaches a first set value, the PLC control system 5 adjusts the opening degree of the regulating valve 31 to 50% through the pneumatic actuator 310; when the liquid level in the sub-tank 1 reaches the second set value, the PLC control system 5 adjusts the opening degree of the regulating valve 31 to 100% by the pneumatic actuator 310.
Specifically, the flow rate of the liquid discharge pump 4 can be adjusted by the PLC control system 5 according to how much the liquid level in the branch tank 1 is higher than the second level value. If the liquid level in the sub-tank 1 is higher than the second level value and has larger deviation with the second level value, the PLC control system 5 performs loading frequency-up control on the liquid discharge pump 4 through the frequency converter 44 to improve the liquid discharge speed; if the liquid level in the sub-tank 1 is higher than the second level value but has a small deviation from the second level value, the PLC control system 5 performs load-shedding and frequency-reduction control on the liquid discharge pump 4 through the frequency converter 44 to reduce the liquid discharge speed.
It should be noted that the foregoing is only a preferred embodiment of the present invention and the technical principles applied. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail with reference to the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the scope of the present invention.
Claims (10)
1. A fluid level control system, comprising:
a separation pool (1);
the main tank (2) is used for collecting liquid in the branch tanks (1), and the liquid level of the main tank (2) is lower than that of the branch tanks (1);
the sub-tanks (1) are communicated with the main tank (2) through the siphon pipes (3);
the branch pool (1) is communicated with the main pool (2) through the liquid discharge pump (4).
2. Level control system according to claim 1, characterized in that the siphon (3) is provided with a regulating valve (31), the regulating valve (31) being adapted to regulate the flow of liquid in the siphon (3).
3. Level control system according to claim 2, characterized in that upstream and downstream of the regulating valve (31) there is a switching valve (30), respectively, said switching valve (30) being able to open or close the siphon (3).
4. The liquid level control system according to claim 1, characterized in that one end of the siphon (3) is provided with a bottom valve (32), and the siphon (3) is communicated with the subpool (1) through the bottom valve (32).
5. Liquid level control system according to claim 4, characterized in that the drainage pump (4) and the bottom valve (32) are each connected to the siphon (3) by means of an on-off valve (30).
6. The liquid level control system according to claim 1, characterized in that an ultrasonic liquid level meter (10) is arranged above the sub-tank (1), and the ultrasonic liquid level meter (10) is used for monitoring the liquid level in the sub-tank (1).
7. The liquid level control system according to claim 6, wherein the upper cover of the sub-tank (1) is provided with a sub-tank cover plate, and the ultrasonic liquid level meter (10) is arranged on the sub-tank cover plate.
8. Level control system according to claim 1, characterized in that the drain pump (4) is connected to the main tank (2) through the siphon (3).
9. A liquid level control system according to claim 8, characterized in that the outlet of the drainage pump (4) is connected to the siphon (3) via an outlet pipe (40), and that the outlet pipe (40) is provided with a non-return valve (41) to prevent the liquid in the outlet pipe (40) from flowing back.
10. Level control system according to claim 9, wherein a flexible connection (42) is provided on the outlet pipe (40), said flexible connection (42) being provided upstream of the non-return valve (41).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921965164.2U CN210776334U (en) | 2019-11-14 | 2019-11-14 | Liquid level control system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921965164.2U CN210776334U (en) | 2019-11-14 | 2019-11-14 | Liquid level control system |
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| CN210776334U true CN210776334U (en) | 2020-06-16 |
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| CN201921965164.2U Active CN210776334U (en) | 2019-11-14 | 2019-11-14 | Liquid level control system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110687938A (en) * | 2019-11-14 | 2020-01-14 | 昆山璟赫机电工程有限公司 | Liquid level control system and method |
| CN113359603A (en) * | 2021-07-12 | 2021-09-07 | 北京中瀚环球真空流体科技有限责任公司 | Vacuum jet siphon drainage equipment monitoring system based on PLC |
-
2019
- 2019-11-14 CN CN201921965164.2U patent/CN210776334U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110687938A (en) * | 2019-11-14 | 2020-01-14 | 昆山璟赫机电工程有限公司 | Liquid level control system and method |
| CN113359603A (en) * | 2021-07-12 | 2021-09-07 | 北京中瀚环球真空流体科技有限责任公司 | Vacuum jet siphon drainage equipment monitoring system based on PLC |
| CN113359603B (en) * | 2021-07-12 | 2022-08-16 | 北京中瀚环球真空流体科技有限责任公司 | Vacuum jet siphon drainage equipment monitoring system based on PLC |
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Address after: Building No. 7, No. 289 Taji Road, Bacheng Town, Kunshan City, Suzhou City, Jiangsu Province, China Patentee after: Jinghe System Technology (Suzhou) Co.,Ltd. Address before: No.312, jingfangpai Town, Suzhou City, Jiangsu Province Patentee before: KUNSHAN FLOWTECH ELECTRO-MECHANICAL ENGINEERING CO.,LTD. |