Control system suitable for siphon filter tank

Abstract

The utility model discloses a control system suitable for a siphon filter tank, and belongs to the technical field of siphon filter tanks. The siphon filter is arranged in a siphon filter body, the siphon filter body comprises filter cells, a filter material layer, a U-shaped sewage discharge siphon, a U-shaped water inlet siphon, a clean water channel and a drainage channel, the U-shaped sewage discharge siphon is connected with a sewage discharge siphon valve, and the U-shaped water inlet siphon is connected with a water inlet siphon valve; one end of the U-shaped blow-off siphon is communicated with the filter grid, and the other end is communicated with the drainage channel; the control system comprises a PLC (Programmable Logic Controller), a liquid level meter arranged at the upper part of the filter lattice, a vacuum pump connected with the U-shaped sewage draining siphon and a turbidity meter arranged at a liquid outlet of the filter material layer; the sewage draining siphon valve, the water inlet siphon valve, the liquid level meter, the vacuum pump and the turbidity meter are all connected with the PLC; liquid level control and backwashing control are realized in the operation process of the siphon filter tank, and automatic operation of the siphon filter tank is realized; meanwhile, the manual supervision load is reduced, the automation degree is improved, and the actual requirement is met.

Description

Technical Field

[0001] The utility model relates to a control system suitable for a siphon filter tank, belonging to the technical field of siphon filter tanks. Background Art

[0002] The siphon filter is a facility for the filtration process of "sand settling + mechanical stirring clarification (inclined tube sedimentation) + siphon filtration water production". The design of the filter from bottom to top is: clear water area → porous filter cap (or filter plate) → filter material (some manganese sand can be added for iron removal). The water flows into the upper part of the pool, and the filtered filtrate passes through the filter material layer and enters the clear water channel of the siphon filter. After confluence of all filter grids, it is discharged into the process water pool. During the filtration process of the siphon filter, affected by the suspended matter, impurities and intercepted silt in the effluent of the front-end process water pool, the pool flow and filtration capacity will gradually decrease over time. When the water inflow is greater than the filtration flow, the pool level will gradually rise until the pool reaches the overflow level, the filter media flow of the filter pool drops to the lowest point, and the filtration capacity is completely lost.

[0003] At present, the water output of conventional siphon filters is about 1000m³ / h. It is designed with eight independent filter grids. Each filter grid is set in the same way. Filtration and backwashing do not affect each other. The siphon filter is filled with filter material, and its designed water turbidity is less than 5NTU. In general, the siphon filter is set for mechanical backwashing or manual backwashing. Under the conditions of high raw water turbidity and high capacity load, the efficiency of manual backwashing is low and the labor intensity of backwashing is high.

[0004] In addition, during the long-term operation of the siphon filter, the filter material layer will leak sand due to the corrosion and aging of the bottom filter plate or filter cap, resulting in uneven flow of the filter material layer, which will lead to abnormal and deteriorated effluent water quality. The single-cell filter has no effective water quality monitoring device and timely water inlet cut-off device, which will cause great process fluctuations and excessive water quality to the effluent of the entire filter. The prior art "CN110327669A A siphon filter and its backwashing method" adopts a traditional timing device. In the actual operation process, due to the long-term operation of the filter grid of the siphon filter, a large amount of sludge will accumulate in the timing tank, resulting in inaccurate backwash timing, which seriously affects the cleanliness of the filter material in the filter grid and causes uneven operation of the effluent cycle of each filter grid; and the timing tank connecting pipe is usually immersed in water all year round, and a large amount of algae, impurities and large suspended matter in the effluent of the previous process filter will cause the timing tank connecting pipe to be blocked, resulting in failure of the backwash control of the siphon filter. "CN114288718A A kind of automatic siphon filter which is easy to monitor" discloses that the main functions are: backwashing the filter during the low water supply period to ensure that all filter cells work normally during the peak water supply period.

[0005] For this reason, a control system that can automatically operate the siphon filter is needed. Summary of the invention

[0006] The utility model aims to solve the existing technical problems and proposes a control system suitable for a siphon filter. In this technical solution, the automatic operation of the siphon filter is realized by performing liquid level control and backwash control during the operation of the siphon filter; at the same time, the manual supervision load is reduced and the degree of automation is improved to meet actual needs.

[0007] In order to achieve the above technical objectives, the following technical solutions are proposed:

[0008] A control system suitable for a siphon filter, which is arranged in a siphon filter body, wherein the siphon filter body comprises a filter grid, a filter material layer, a U-shaped sewage siphon pipe, a U-shaped water inlet siphon pipe, a clean water channel and a drainage channel, wherein the U-shaped sewage siphon pipe is connected to a sewage siphon valve, and the U-shaped water inlet siphon pipe is connected to a water inlet siphon valve; one end of the U-shaped sewage siphon pipe is connected to the filter grid, and the other end is connected to the drainage channel;

[0009] The control system includes a PLC controller, a liquid level meter located on the top of the filter grid, a vacuum pump connected to the U-shaped sewage siphon pipe, and a turbidity meter located at the liquid outlet of the filter layer. The sewage siphon valve, the water inlet siphon valve, the liquid level meter, the vacuum pump and the turbidity meter are all connected to the PLC controller;

[0010] A signal path for the operation of a U-shaped sewage siphon pipe is formed between the liquid level meter, the PLC controller, the sewage siphon valve and the vacuum pump;

[0011] A signal path for stopping the operation of the U-shaped water inlet siphon pipe is formed between the turbidity meter, the PLC controller and the water inlet siphon valve.

[0012] Preferably, the liquid level meter is located on the same horizontal line as the lower side of the arc section of the U-shaped sewage siphon.

[0013] Preferably, the PLC controller is connected to a voice alarm and an indicator light.

[0014] In the present technical solution, positional relationships such as "middle", "one end", "the other end", "between", "upper part", and "lower side" are defined according to the situations under actual usage conditions. They are conventional terms in this technical field and are also conventional terms used by technical personnel in this field in actual usage.

[0015] The beneficial technical effects brought about by adopting this technical solution are:

[0016] The utility model is based on PLC controller control, and centrally controls the vacuum pump, liquid level meter, turbidity meter, sewage siphon valve, and water inlet siphon valve to realize automatic backwash control and operation of the siphon filter tank; in addition, the arrangement of the turbidity meter automatically detects the water outlet of each filter grid, and timely repairs the filter material layer and filter cap, etc., which effectively reduces the manual supervision load and improves the degree of automation;

[0017] The arrangement of the liquid level meter realizes the automatic discharge and backwashing of the liquid in the filter grid, thereby improving the automated operation control of the siphon filter. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a workflow diagram of the utility model;

[0019] In the figure: 1. filter grid, 2. filter material layer, 3. U-shaped sewage siphon, 4. U-shaped water inlet siphon, 5. clean water channel, 6. drainage channel, 7. sewage siphon valve, 8. water inlet siphon valve, 9. PLC controller, 10. liquid level meter, 11. vacuum pump, 12. turbidity meter. DETAILED DESCRIPTION

[0020] The following is a clear and complete description of the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0021] Example 1

[0022] A control system suitable for a siphon filter, such as Figure 1 As shown, it is arranged in a siphon filter body, and the siphon filter body includes a filter grid 1, a filter material layer 2, a U-shaped sewage siphon pipe 3, a U-shaped water inlet siphon pipe 4, a clean water channel 5 and a drainage channel 6. The U-shaped sewage siphon pipe 3 is connected to a sewage siphon valve 7, and the U-shaped water inlet siphon pipe 4 is connected to an inlet siphon valve 8; one end of the U-shaped sewage siphon pipe 3 is connected to the filter grid 1, and the other end is connected to the drainage channel 6;

[0023] The control system includes a PLC controller 9, a liquid level meter 10 arranged on the upper part of the filter grid 1, a vacuum pump 11 connected to the U-shaped sewage siphon pipe 3 and a turbidity meter 12 arranged at the liquid outlet of the filter material layer 2. The sewage siphon valve 7, the water inlet siphon valve 8, the liquid level meter 10, the vacuum pump 11 and the turbidity meter 12 are all connected to the PLC controller 9; a signal path for the operation of the U-shaped sewage siphon pipe 3 is formed between the liquid level meter 10, the PLC controller 9, the sewage siphon valve 7 and the vacuum pump 11; a signal path for stopping the operation of the U-shaped water inlet siphon pipe 4 is formed between the turbidity meter 12, the PLC controller 9 and the water inlet siphon valve 8.

[0024] In addition, the PLC controller 9 is connected to a voice alarm and indicator lights, which facilitates the operator to monitor information in a timely manner, so as to repair and replace parts, and timely and effectively reduce the risk of water quality exceeding the standard.

[0025] The working principles involved include:

[0026] 1. During normal operation, first, the PLC controller 9 controls the water inlet siphon valve 8 of the filter grid 1 to close, and then the air in the water inlet siphon box is emptied through the air extraction tee and the siphon exhaust pipe, and then the siphon box forms a siphon to allow water to flow into the filter grid 1 normally;

[0027] 2. When the suspended solids and impurities in the influent are filtered and intercepted by the filter material layer 2, and the liquid level in the filter grid 1 rises to the highest scale of the liquid level meter 10, the liquid level meter 10 feeds back a signal to the PLC controller 9; then, the PLC controller 9 controls the opening of the influent siphon valve 8 to destroy the influent siphon and stop the influent;

[0028] 3. Then, the PLCPLC controller 9 controls the closure of the sewage siphon valve 7 and starts the vacuum pump 11 until the liquid level in the monitoring filter 1 drops (e.g., drops by 1m), and the vacuum pump 11 stops operating;

[0029] 4. When the liquid level in the filter grid 1 drops to 20m height of the filter material layer, start the cleaning time of the filter grid 1, and the filter material layer 2 of the filter grid 1 is backwashed by the clean water channel 5. After cleaning for 2-5 minutes, open the sewage siphon valve 7 to destroy the vacuum of the U-shaped sewage siphon pipe 3, and stop sewage flushing;

[0030] 5. Then, close the water inlet siphon valve 8, allow the water inlet siphon tank to reach a vacuum condition, and re-infuse water into the filter grid 1 (repeat step 1);

[0031] And, water quality control that does not meet the standard: when the monitoring value of the turbidity meter 12 installed at the liquid outlet of the filter layer 2 of the single-cell filter 1 reaches 10NTU, the PLC controls to open the water inlet siphon valve 8, destroying the water inlet of the filter 1, and displays an alarm, thereby reminding the operator that the water outlet of the filter tank is faulty and the filter layer 2 must be checked.

[0032] Example 2

[0033] On the basis of Example 1, this example further limits the arrangement of the liquid level meter 10 to further illustrate the technical solution.

[0034] The liquid level meter 10 is located on the same horizontal line as the lower side of the arc section of the U-shaped sewage siphon 3 , which can effectively monitor the state of the filter layer 2 and discharge waste liquid through the sewage pipe in time to achieve backwashing of the filter layer 2 .

Claims

1. A control system suitable for a siphon filter, characterized in that: The siphon filter is arranged in a siphon filter body, the siphon filter body comprising a filter grid (1), a filter material layer (2), a U-shaped sewage discharge siphon pipe (3), a U-shaped water inlet siphon pipe (4), a clean water channel (5) and a drainage channel (6); the U-shaped sewage discharge siphon pipe (3) is connected to a sewage discharge siphon valve (7), and the U-shaped water inlet siphon pipe (4) is connected to a water inlet siphon valve (8); one end of the U-shaped sewage discharge siphon pipe (3) is connected to the filter grid (1), and the other end is connected to the drainage channel (6); The control system comprises a PLC controller (9), a liquid level meter (10) disposed on the upper part of the filter grid (1), a vacuum pump (11) connected to the U-shaped sewage siphon (3), and a turbidity meter (12) disposed at the liquid outlet of the filter material layer (2); the sewage siphon valve (7), the water inlet siphon valve (8), the liquid level meter (10), the vacuum pump (11), and the turbidity meter (12) are all connected to the PLC controller (9); A signal path for the operation of the U-shaped sewage siphon pipe (3) is formed between the liquid level meter (10), the PLC controller (9), the sewage siphon valve (7) and the vacuum pump (11); A signal path for stopping the operation of the U-shaped water inlet siphon pipe (4) is formed between the turbidity meter (12), the PLC controller (9) and the water inlet siphon valve (8).

2. The control system suitable for a siphon filter according to claim 1, characterized in that: The liquid level meter (10) and the lower side of the arc section of the U-shaped sewage siphon (3) are located on the same horizontal line.

3. The control system applicable to the siphon filter according to claim 1, characterized in that: The PLC controller (9) is connected to a voice alarm and an indicator light.

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