Automatic dilution system for sodium hypochlorite stock solution of water plant

Abstract

The utility model provides a kind of water plant sodium hypochlorite stock solution automatic dilution system, including sodium hypochlorite stock solution bucket, venturi water jet, dilution bucket, liquid level sensor, electric valve and water level control module.System uses venturi water jet principle, with water pressure as power to add stock solution, replace traditional chemical pump, solve low temperature crystallization jam problem;Water level control module automatically controls electric valve action according to liquid level sensor data, realizes stock solution and clean water according to proportion dilution, without manual intervention;Through valve interlock, time delay judgment, low liquid level alarm and anti-overflow protection etc. Design, improve dilution precision and system safety.The utility model is applicable to automatic dilution of sodium hypochlorite of waterworks, reduces the cost of using people, improves disinfection process stability.

Description

Technical Field

[0001] This utility model relates to the field of disinfection technology for waterworks, and in particular to an automatic dilution system for sodium hypochlorite stock solution in waterworks. Background Technology

[0002] Sodium hypochlorite rapidly hydrolyzes and decomposes when added to water. The hypochlorite ions (ClO⁻) combine with hydrogen ions (H⁺) in the water to form hypochlorous acid (HClO). Hypochlorous acid itself has a certain bactericidal effect, adsorbing onto the surface of bacteria or viruses and penetrating the cell wall to enter the cell. Through strong oxidation, it alters the proteins inside the bacteria or viruses, thus achieving sterilization and disinfection. Further decomposition of hypochlorous acid produces hydrochloric acid (HCl) and fresh oxygen atoms (O), which also have some disinfection effect. Currently, many water plants in China use chlorine for disinfection. However, traditional chlorine disinfection methods have potential safety hazards during transportation, storage, and operation. Therefore, sodium hypochlorite is gradually being promoted as an alternative disinfectant. Sodium hypochlorite is safer in tap water treatment, reducing the risk of leakage and explosion.

[0003] However, sodium hypochlorite stock solution with a concentration of approximately 10% needs to be diluted before addition. Traditional dilution methods have the following problems:

[0004] 1. When using a chemical pump to extract the raw liquid, sodium hypochlorite is prone to crystallization at low temperatures, which can cause the pump to jam.

[0005] 2. Manual or semi-automatic dilution methods have low accuracy and require dedicated personnel, increasing labor costs;

[0006] 3. Problems such as false triggering of the liquid level sensor and asynchronous valve operation can easily lead to deviations in dilution concentration or water overflow from the equipment. Utility Model Content

[0007] To address the shortcomings of existing technologies, this invention provides an automatic dilution system for sodium hypochlorite stock solution in water plants. It replaces chemical pumps with Venturi water jets and combines them with liquid level control to achieve fully automatic dilution, thereby improving safety and accuracy.

[0008] To achieve the above objectives, the present invention adopts the following technical solution:

[0009] An automatic dilution system for sodium hypochlorite stock solution in a water plant includes a sodium hypochlorite stock solution tank, a sodium hypochlorite stock solution tank replenishment port, a sodium hypochlorite stock solution tank outlet, a sodium hypochlorite stock solution outlet valve, a sodium hypochlorite stock solution tank level sensor, a sodium hypochlorite stock solution dosing pipeline, a sodium hypochlorite stock solution dosing Venturi jet injector, a sodium hypochlorite stock solution dosing electric valve, a sodium hypochlorite stock solution dosing manual valve, a clean water electric valve, a clean water manual valve, a dilution clean water pipeline, a sodium hypochlorite dilution tank, a sodium hypochlorite dilution tank clean water inlet, a sodium hypochlorite inlet of the sodium hypochlorite dilution tank, a sodium hypochlorite dilution tank level sensor, a sodium hypochlorite dilution tank outlet, a flooding sensor, and a sodium hypochlorite stock solution dosing water level control module.

[0010] The sodium hypochlorite stock solution tank is connected to the sodium hypochlorite stock solution dosing pipeline through the sodium hypochlorite stock solution tank outlet. The pipeline is equipped with a sodium hypochlorite stock solution outlet valve, a sodium hypochlorite stock solution dosing electric valve, a sodium hypochlorite stock solution dosing manual valve, and a sodium hypochlorite stock solution dosing Venturi water jet. It is connected to the sodium hypochlorite dilution tank through the sodium hypochlorite inlet. The sodium hypochlorite dilution tank outlet is set at the bottom of the sodium hypochlorite dilution tank outlet.

[0011] The dilution water pipeline is equipped with an electric water valve and a manual water valve in sequence, and is connected to the sodium hypochlorite dilution tank through the water inlet of the sodium hypochlorite dilution tank.

[0012] The sodium hypochlorite stock solution tank level sensor, sodium hypochlorite dilution tank level sensor, and flooding sensor are all electrically connected to the sodium hypochlorite stock solution addition water level control module. The sodium hypochlorite stock solution addition electric valve and the clean water electric valve are controlled by the sodium hypochlorite stock solution addition water level control module.

[0013] Furthermore, the sodium hypochlorite stock solution dosing Venturi water jet uses the natural water pressure of the plant water as power to draw sodium hypochlorite stock solution from the stock solution tank and add it to the dilution tank through the Venturi effect; the sodium hypochlorite stock solution outlet valve and the sodium hypochlorite stock solution dosing manual valve are normally in the open state.

[0014] Furthermore, the sodium hypochlorite stock solution addition water level control module is preset with low and high liquid level values ​​for the sodium hypochlorite dilution tank, a preset value for the liquid level drop in the sodium hypochlorite stock solution tank, and a low liquid level alarm value. When the liquid level in the sodium hypochlorite dilution tank reaches the low liquid level value, the sodium hypochlorite stock solution addition electric valve is controlled to open. When the liquid level in the stock solution tank drops to the preset value, the sodium hypochlorite stock solution addition electric valve is controlled to close. Subsequently, the clean water electric valve is controlled to open until the liquid level in the dilution tank reaches the high liquid level value and then the clean water electric valve is closed.

[0015] Furthermore, when the sodium hypochlorite stock solution tank level is less than or equal to the low level alarm value, the sodium hypochlorite stock solution dosing level control module sends an alarm signal to the water plant control room.

[0016] Furthermore, both the sodium hypochlorite inlet and the clean water inlet of the sodium hypochlorite dilution tank are porous pipes, and the ends of the pipes extend to the bottom of the dilution tank; when water flows through the porous pipes, it generates a spin, which makes the original solution and clean water mix evenly.

[0017] Furthermore, the sodium hypochlorite stock solution dosing electric valve is interlocked with the water electric valve, and the water electric valve can only be opened after a 1-minute delay following the closure of the stock solution dosing electric valve.

[0018] Furthermore, when the sodium hypochlorite dilution tank reaches a low level for more than 5 minutes, the sodium hypochlorite stock solution addition water level control module starts the stock solution addition process; when the level reaches a high level for more than 1 minute, the control water electric valve is closed.

[0019] Furthermore, the connection between the electric valve for clean water and the diluted clean water pipeline, and the connection between the electric valve for adding sodium hypochlorite concentrate and the concentrate addition pipeline, both use union joints; the manual valve for clean water and the manual valve for adding concentrate are used to shut off the pipeline when the corresponding electric valve fails.

[0020] Furthermore, the sodium hypochlorite dilution tank is equipped with a float switch at the clean water inlet, which closes at a height higher than the preset high liquid level value of the dilution tank; when the liquid level in the dilution tank exceeds the high liquid level value, the float switch physically closes the clean water inlet.

[0021] Furthermore, the flood sensor is installed on the ground below the sodium hypochlorite dilution tank. When the dilution tank overflows, the sensor is triggered and an alarm is sent to the central control room.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] 1. A Venturi water jet is used, which utilizes the plant's water pressure as a power source to avoid crystallization failure of the chemical pump at low temperatures and improve equipment reliability.

[0024] 2. Fully automatic dilution is achieved through a water level control module, eliminating the need for manual intervention and reducing labor costs.

[0025] 3. The design features such as delayed judgment by the liquid level sensor and valve interlock improve dilution accuracy and reduce misoperation.

[0026] 4. Multiple protections including low liquid level alarm, float switch, and flooding sensor enhance system safety. Attached Figure Description

[0027] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0028] Figure 1 This is a schematic diagram of the structure of an embodiment of the present utility model.

[0029] In the above attached diagram: 1. Sodium hypochlorite stock solution tank; 2. Sodium hypochlorite stock solution tank replenishment port; 3. Sodium hypochlorite stock solution tank outlet; 4. Sodium hypochlorite stock solution outlet valve; 5. Sodium hypochlorite stock solution tank level sensor; 6. Sodium hypochlorite stock solution dosing pipeline; 7. Sodium hypochlorite stock solution dosing Venturi jet; 8. Sodium hypochlorite stock solution dosing electric valve; 9. Sodium hypochlorite stock solution dosing manual valve; 10. Clean water electric valve; 11. Clean water manual valve; 12. Diluent water pipeline; 13. Sodium hypochlorite dilution tank; 14. Sodium hypochlorite dilution tank clean water inlet; 15. Sodium hypochlorite dilution tank sodium hypochlorite inlet; 16. Sodium hypochlorite dilution tank level sensor; 17. Sodium hypochlorite dilution tank outlet; 18. Flooding sensor. Detailed Implementation

[0030] The technical solution of this utility model will be further described below with reference to the accompanying drawings and embodiments.

[0031] like Figure 1 As shown, an automatic dilution system for sodium hypochlorite stock solution in a water plant includes:

[0032] Sodium hypochlorite stock solution tank 1: Made of PE material, with a volume of 5m³, top is equipped with sodium hypochlorite stock solution tank replenishment port 2, diameter DN100, bottom is equipped with sodium hypochlorite stock solution tank outlet 3, diameter DN50.

[0033] Sodium hypochlorite stock solution dosing pipeline 6: Made of PVC material, diameter DN50, connected in sequence to sodium hypochlorite stock solution outlet valve 4, DN50 ball valve, sodium hypochlorite stock solution dosing electric valve 8, model: Q941F-16, DN50, sodium hypochlorite stock solution dosing manual valve 9, DN50 ball valve, and sodium hypochlorite stock solution dosing Venturi water jet 7, made of PVC material, diameter DN50, and connected at the end to sodium hypochlorite dilution tank 13 through sodium hypochlorite dilution tank inlet 15;

[0034] Diluted water pipeline 12: Made of PVC material, diameter DN80, connected in sequence to clean water electric valve 10 and clean water manual valve 11. Among them, clean water electric valve 10 model: Q941F-16, DN80, clean water manual valve 11 is a DN80 ball valve, and the end is connected to sodium hypochlorite dilution tank 13 through clean water inlet 14 of sodium hypochlorite dilution tank.

[0035] Sensor selection: The sodium hypochlorite stock solution tank level sensor 5 and the sodium hypochlorite dilution tank level sensor 16 are both submersible level transmitters installed on the side wall of the tank. The selected parameters for the level transmitters are: range 0-3m, accuracy ±0.5%FS; the water flooding sensor 18 is a contact leakage sensor with a response time of <1s, installed on the ground below the sodium hypochlorite dilution tank 13.

[0036] Sodium hypochlorite stock solution dosing water level control module: adopts a PLC controller, model: Siemens S7-1200, which integrates a signal acquisition module and a relay output module to receive sensor signals and control the electric valve.

[0037] Working principle of the Venturi water jet injector: The Venturi water jet injector 7 utilizes the Venturi effect to add sodium hypochlorite stock solution. When the plant water with a pressure of 0.2-0.4 MPa flows through the nozzle of the water jet injector, the flow velocity increases, creating a negative pressure in the suction chamber, which draws the sodium hypochlorite stock solution from the sodium hypochlorite stock solution tank 1. After the water flow and the stock solution are fully mixed in the diffuser, they are sent to the sodium hypochlorite dilution tank 13 through the sodium hypochlorite inlet 15. During use, the sodium hypochlorite stock solution outlet valve 4 and the sodium hypochlorite stock solution dosing manual valve 9 remain normally open, and the dosing is controlled only by the sodium hypochlorite stock solution dosing electric valve 8.

[0038] In the automatic dilution control process, the preset parameters of the sodium hypochlorite stock solution addition water level control module are as follows: the low liquid level of sodium hypochlorite dilution tank 13 is 1m, which triggers the addition of stock solution; the high liquid level is 2m, which stops the addition of clean water; the preset value for the drop in liquid level of sodium hypochlorite stock solution tank 1 is 0.5m, which controls the amount of stock solution added; the low liquid level alarm value of sodium hypochlorite stock solution tank 1 is 0.3m.

[0039] The automatic dilution process is as follows:

[0040] When the sodium hypochlorite dilution tank level sensor 16 detects that the sodium hypochlorite dilution tank 13 has reached 1m, the sodium hypochlorite stock solution addition water level control module outputs a signal to open the sodium hypochlorite stock solution addition electric valve 8, and the sodium hypochlorite stock solution addition Venturi water jet 7 starts adding stock solution.

[0041] When the sodium hypochlorite stock solution tank level sensor 5 detects a drop of 0.5m in the sodium hypochlorite stock solution tank 1, such as from 2.0m to 1.5m, the sodium hypochlorite stock solution addition water level control module controls the sodium hypochlorite stock solution addition electric valve 8 to close, thus completing the stock solution addition.

[0042] After the sodium hypochlorite stock solution is added, the sodium hypochlorite stock solution addition water level control module controls the opening of the clean water electric valve 10 to inject clean water into the sodium hypochlorite dilution tank 13;

[0043] When the sodium hypochlorite dilution tank level sensor 16 detects that the sodium hypochlorite dilution tank 13 has reached 2m, the sodium hypochlorite stock solution addition water level control module controls the clean water electric valve 10 to close, completing one automatic dilution.

[0044] Low liquid level alarm function: When the liquid level sensor 5 of the sodium hypochlorite stock solution tank detects that the liquid level of the sodium hypochlorite stock solution tank 1 is ≤0.3m, the sodium hypochlorite stock solution addition water level control module sends an alarm signal to the water plant control room through RS485 communication. It can be an audible and visual alarm + SMS notification, prompting the operator to replenish the stock solution in time through the replenishment port 2 of the sodium hypochlorite stock solution tank.

[0045] Uniform dilution design: Both the sodium hypochlorite inlet 14 and the clean water inlet 15 of the sodium hypochlorite dilution tank adopt porous pipes with a diameter of 5mm and 8 holes, and the end of the pipes extends to the bottom of the sodium hypochlorite dilution tank 13. When water flows out through the porous pipes, it forms a rotating water flow, which drives the liquid inside the tank to rotate, so that the sodium hypochlorite stock solution and clean water are fully mixed. The mixing uniformity is improved by more than 30% compared with the traditional straight pipe water inlet.

[0046] Valve interlock and delay control: To avoid concentration deviation caused by simultaneous addition of sodium hypochlorite concentrate and water, the sodium hypochlorite concentrate dosing electric valve 8 and the water dosing electric valve 10 are electrically interlocked through the sodium hypochlorite concentrate dosing water level control module, and the two cannot be opened at the same time; at the same time, a 1-minute delay is set: after the sodium hypochlorite concentrate dosing electric valve 8 is closed, the water dosing electric valve 10 is opened after a 1-minute delay to ensure that the concentrate has completely entered the dilution tank before water is added.

[0047] Liquid level sensor delay judgment: To prevent false triggering of the liquid level sensor, the sodium hypochlorite stock solution addition water level control module is set with a delay judgment logic: the clear water electric valve 10 is only controlled to close when the liquid level in the sodium hypochlorite dilution tank 13 reaches a high liquid level value of 2m for 1 minute; the stock solution addition process is only started when the liquid level reaches a low liquid level value of 1m for 5 minutes, effectively filtering out maloperation caused by sensor fluctuations.

[0048] Convenient maintenance design: The connection between the clean water electric valve 10 and the diluted clean water pipeline 12, and the connection between the sodium hypochlorite stock solution dosing electric valve 8 and the sodium hypochlorite stock solution dosing pipeline 6, all adopt union joints, model: DN80 / DN50 PVC union joints, which facilitates quick disassembly and replacement in case of valve failure; when the electric valve needs maintenance, the corresponding clean water manual valve 11 or sodium hypochlorite stock solution dosing manual valve 9 can be closed to cut off the pipeline medium and ensure maintenance safety.

[0049] Overflow protection mechanism:

[0050] Float switch: A float switch, model: QL-10, is installed at the clean water inlet 14 of the sodium hypochlorite dilution tank. The operating liquid level is 2.1m, and its closing height is higher than the preset high liquid level value of the sodium hypochlorite dilution tank 13, which is 2m. When the liquid level sensor or the clean water electric valve fails and causes the liquid level to exceed 2.1m, the float switch physically cuts off the water inlet to prevent overflow.

[0051] Flood sensor 18: If the sodium hypochlorite dilution tank 13 overflows, the flood sensor 18 will detect the water accumulation and immediately send an alarm signal to the central control room through the sodium hypochlorite stock solution addition water level control module to prompt emergency handling and drain the water through the sodium hypochlorite dilution tank outlet 17.

[0052] This embodiment utilizes a Venturi jet injector to add the concentrate using the plant's water pressure, replacing the traditional chemical pump and resolving the low-temperature crystallization issue. The control module automatically controls the electric valves for both the concentrate and purified water based on level sensor data, achieving fully automated dilution. The system features level alarms, valve interlocks, and overflow protection, improving dilution accuracy and safety, and is suitable for disinfection processes in waterworks.

[0053] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this utility model without departing from the spirit and scope of the technical solutions of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. An automatic dilution system for sodium hypochlorite stock solution in a water plant, characterized in that, Includes sodium hypochlorite stock solution tank (1), sodium hypochlorite stock solution tank replenishment port (2), sodium hypochlorite stock solution tank outlet (3), sodium hypochlorite stock solution outlet valve (4), sodium hypochlorite stock solution tank level sensor (5), sodium hypochlorite stock solution dosing pipeline (6), sodium hypochlorite stock solution dosing Venturi water jet (7), sodium hypochlorite stock solution dosing electric valve (8), sodium hypochlorite stock solution dosing manual valve (9), clean water electric valve (10), clean water manual valve (11), dilution clean water pipeline (12), sodium hypochlorite dilution tank (13), sodium hypochlorite dilution tank clean water inlet (14), sodium hypochlorite dilution tank sodium hypochlorite inlet (15), sodium hypochlorite dilution tank level sensor (16), sodium hypochlorite dilution tank outlet (17), flooding sensor (18), and sodium hypochlorite stock solution dosing water level control module; The sodium hypochlorite stock solution tank (1) is connected to the sodium hypochlorite stock solution dosing pipeline (6) through the sodium hypochlorite stock solution tank outlet (3). The pipeline is equipped with a sodium hypochlorite stock solution outlet valve (4), a sodium hypochlorite stock solution dosing electric valve (8), a sodium hypochlorite stock solution dosing manual valve (9), and a sodium hypochlorite stock solution dosing Venturi water jet (7) in sequence. It is connected to the sodium hypochlorite dilution tank (13) through the sodium hypochlorite inlet (15). The sodium hypochlorite dilution tank (13) is equipped with a sodium hypochlorite dilution tank outlet (17) at the bottom. The dilution water pipeline (12) is equipped with a water electric valve (10) and a water manual valve (11) in sequence, and is connected to the sodium hypochlorite dilution tank (13) through the water inlet (14) of the sodium hypochlorite dilution tank. The sodium hypochlorite stock solution tank level sensor (5), sodium hypochlorite dilution tank level sensor (16), and flooding sensor (18) are electrically connected to the sodium hypochlorite stock solution addition water level control module, respectively. The sodium hypochlorite stock solution addition electric valve (8) and the clean water electric valve (10) are controlled by the sodium hypochlorite stock solution addition water level control module.

2. The automatic dilution system for sodium hypochlorite stock solution in a water plant as described in claim 1, characterized in that, The sodium hypochlorite stock solution venturi jet (7) uses the natural water pressure of the plant water as power to draw sodium hypochlorite stock solution from the stock solution tank (1) and add it to the dilution tank (13) through the Venturi effect; the sodium hypochlorite stock solution outlet valve (4) and the sodium hypochlorite stock solution manual valve (9) are normally in the open state.

3. The automatic dilution system for sodium hypochlorite stock solution in a water plant as described in claim 1, characterized in that, The sodium hypochlorite stock solution addition water level control module is preset with low liquid level value, high liquid level value, preset value for liquid level drop in sodium hypochlorite stock solution tank and low liquid level alarm value; when the liquid level in sodium hypochlorite dilution tank (13) reaches the low liquid level value, the sodium hypochlorite stock solution addition electric valve (8) is controlled to open; when the liquid level in stock solution tank (1) drops to the preset value, the sodium hypochlorite stock solution addition electric valve (8) is controlled to close; then the clean water electric valve (10) is controlled to open until the liquid level in dilution tank (13) reaches the high liquid level value and the clean water electric valve (10) is closed.

4. The automatic dilution system for sodium hypochlorite stock solution in a water plant as described in claim 1, characterized in that, When the liquid level in the sodium hypochlorite stock solution tank (1) is less than or equal to the low liquid level alarm value, the sodium hypochlorite stock solution addition water level control module sends an alarm signal to the water plant control room.

5. The automatic dilution system for sodium hypochlorite stock solution in a water plant as described in claim 1, characterized in that, The sodium hypochlorite dilution tank has a sodium hypochlorite inlet (15) and a clean water inlet (14) that are both porous pipes, and the ends of the pipes extend to the bottom of the dilution tank (13). When water flows through the porous pipes, it generates a spin, which makes the original solution and clean water mix evenly.

6. The automatic dilution system for sodium hypochlorite stock solution in a water plant as described in claim 1, characterized in that, The sodium hypochlorite stock solution dosing electric valve (8) is interlocked with the water electric valve (10), and the water electric valve (10) can only be opened after a 1-minute delay after the stock solution dosing electric valve (8) is closed.

7. The automatic dilution system for sodium hypochlorite stock solution in a water plant as described in claim 1, characterized in that, When the sodium hypochlorite dilution tank (13) reaches a low level for more than 5 minutes, the sodium hypochlorite raw material addition water level control module starts the raw material addition process; when the liquid level reaches a high level for more than 1 minute, the control water electric valve (10) is closed.

8. The automatic dilution system for sodium hypochlorite stock solution in a water plant as described in claim 1, characterized in that, The connection between the clean water electric valve (10) and the dilution clean water pipeline (12), and the connection between the sodium hypochlorite stock solution dosing electric valve (8) and the stock solution dosing pipeline (6) are all made with union joints; the clean water manual valve (11) and the stock solution dosing manual valve (9) are used to close the pipeline when the corresponding electric valve fails.

9. An automatic dilution system for sodium hypochlorite stock solution in a water plant as described in claim 1, characterized in that, The sodium hypochlorite dilution tank is equipped with a float switch at the water inlet (14), which is closed at a height higher than the preset high liquid level of the dilution tank (13). When the liquid level of the dilution tank (13) exceeds the high liquid level, the float switch physically closes the water inlet (14).

10. An automatic dilution system for sodium hypochlorite stock solution in a water plant as described in claim 1, characterized in that, The water flooding sensor (18) is installed on the ground below the sodium hypochlorite dilution tank (13). When the dilution tank (13) overflows, the sensor is triggered and an alarm is sent to the central control room.

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