Primary water purification equipment

Abstract

The utility model discloses primary water purification equipment which comprises a raw water tank, a primary filtering device, a secondary filtering device, a booster pump, an RO (reverse osmosis) main machine, a pure water tank and a concentrated water tank which are sequentially connected through pipelines, a concentrated water outlet pipeline on the RO main machine is connected with the concentrated water tank, and a concentrated water return pipeline is arranged on the concentrated water outlet pipeline. A backflow control valve is arranged on the concentrated water backflow pipeline, the other end of the concentrated water backflow pipeline is connected with a water inlet pipeline of the booster pump, and a part of concentrated water flows back to the front of the booster pump, so that the concentration of pretreatment water is increased, the water inlet amount of an inner membrane of the RO main machine is increased, the flow speed of water in the membrane is increased, and the probability that the membrane is blocked is reduced; the service life of the membrane is prolonged, and the water yield can be ensured after long-time operation.

Description

Technical Field

[0001] This utility model belongs to the field of water purification technology, and more specifically relates to a first-stage pure water device. Background Technology

[0002] In common water purification devices, booster pumps are used to pressurize the filtration system to ensure that raw water can effectively pass through the RO membrane (reverse osmosis membrane). However, after a certain period of time, the membrane will become clogged with impurities, thereby reducing the influent flow rate, the outfluent flow rate, and the membrane's lifespan. The usual solution is to add a flushing system to flush the membrane with filtered pure water to ensure the membrane's filtration effect and lifespan. However, this is usually done before filtration when the equipment is turned on. Cleaning cannot be performed while the equipment is running, and the membrane begins to clog during operation. Therefore, its water production will gradually decrease, and long-term operation cannot guarantee water production. Utility Model Content

[0003] To address the shortcomings of existing technologies, this utility model provides a primary pure water device. By recirculating a portion of the concentrated water back to the booster pump, the concentration of the pretreated water is increased, thereby increasing the water inlet flow rate of the RO main unit's inner membrane, increasing the water flow rate inside the membrane, reducing the likelihood of membrane clogging, extending the membrane's service life, and ensuring water production even during long-term operation.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a primary pure water device, comprising a raw water tank, a primary filtration device, a secondary filtration device, a booster pump, an RO main unit, a pure water tank, and a concentrated water tank connected sequentially by pipes. The concentrated water outlet pipe on the RO main unit is connected to the concentrated water tank. A concentrated water return pipe is provided on the concentrated water outlet pipe, and a return control valve is provided on the concentrated water return pipe. The other end of the concentrated water return pipe is connected to the inlet pipe of the booster pump.

[0005] Furthermore, the primary filtration device includes a quartz sand filter and an activated carbon filter. The quartz sand filter is connected to the raw water tank via a pipe, the quartz sand filter is connected to the activated carbon filter, and the activated carbon filter is connected to the secondary filtration device.

[0006] Furthermore, the secondary filtration device is a precision filter, which is connected to a booster pump via a pipeline, and the concentrated water return pipeline is connected to the pipeline.

[0007] Furthermore, each of the raw water tank, pure water tank, and concentrated water tank is equipped with a level switch.

[0008] Furthermore, pressure protection switches are installed on both the inlet and outlet pipes of the booster pump.

[0009] Furthermore, a booster pump return pipe is provided between the inlet and outlet pipes of the booster pump, and a return valve is provided on the booster pump return pipe.

[0010] Compared with the prior art, the beneficial effects of this utility model are as follows: When it is necessary to flush the membrane in the RO unit, the reflux control valve on the concentrate return pipe is opened, so that the concentrate in the concentrate outlet pipe flows into the concentrate return pipe, thereby causing a certain amount of concentrate to flow back to the inlet pipe of the booster pump, mix with the pre-treated water and pressurize before entering the RO unit. Due to the increased concentration of the pre-treated water, not only can the water intake of the membrane be increased, but the water flow rate inside the membrane can also be increased, thereby reducing the chance of membrane blockage, extending the service life of the membrane, and ensuring water production even during long-term operation. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the structure of the primary pure water equipment of this utility model.

[0012] Figure reference numerals: 1. Raw water tank; 2. Booster pump; 3. RO unit; 4. Pure water tank; 5. Concentrated water tank; 6. Concentrated water outlet pipe; 7. Concentrated water return pipe; 8. Return control valve; 9. Inlet pipe; 10. Raw water pump; 11. Quartz sand filter; 12. Activated carbon filter; 13. Precision filter; 14. Pressure protection switch; 15. Booster pump return pipe; 16. Return valve; 17. Automatic flushing solenoid valve; 18. Wastewater regulating valve. Detailed Implementation

[0013] In the description of this utility model, it should be noted that the directional terms such as "center", "horizontal (X)", "longitudinal (Y)", "vertical (Z)", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", and "counterclockwise" indicate the orientation and positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. They should not be construed as limiting the specific protection scope of this utility model.

[0014] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features. Thus, the use of "first" and "second" to define a feature may explicitly or implicitly include one or more of that feature. In the description of this utility model, "several" or "a number" means two or more, unless otherwise explicitly specified.

[0015] Reference Figure 1 The present invention will be further described below.

[0016] A primary pure water device includes a raw water tank, a primary filter, a secondary filter, a booster pump, an RO unit, a pure water tank, and a concentrate tank, which are connected in sequence by pipes. The concentrate outlet pipe on the RO unit is connected to the concentrate tank. A concentrate return pipe is provided on the concentrate outlet pipe. A return control valve is provided on the concentrate return pipe. The other end of the concentrate return pipe is connected to the inlet pipe of the booster pump.

[0017] like Figure 1 As shown, the booster pump pressurizes the pretreated water, which has passed through the primary and secondary filtration devices, to the pressure required by the RO unit. After passing through the reverse osmosis module in the RO unit, the pretreated water is separated into primary pure water and concentrated water, which are discharged into the pure water tank and concentrated water tank respectively. When it is necessary to flush the membrane in the RO unit, the reflux control valve on the concentrated water return pipe is opened, allowing the concentrated water in the concentrated water outlet pipe to flow into the concentrated water return pipe. This causes a certain amount of concentrated water to flow back into the inlet pipe of the booster pump, mix with the pretreated water, and be pressurized before entering the RO unit. By increasing the concentration of the pretreated water, not only can the water flow rate into the membrane be increased, but the water flow rate inside the membrane can also be increased, thereby reducing the chance of membrane clogging, extending the membrane's service life, and ensuring water production even during long-term operation.

[0018] Specifically, due to the increased concentration of the pretreated water, if operation is prolonged, although membrane clogging is relatively optimistic, the membrane's lifespan will far exceed that of typical operation (without concentrate recirculation). Therefore, the conductivity of the membrane's permeate will slightly increase, causing the conductivity of the filtered pure water to rise within the acceptable range (conductivity ≤ 0.01 mS / m) until it becomes unacceptable and its lifespan is exhausted.

[0019] Specifically, a raw water pump is installed outside the raw water tank to achieve active water supply.

[0020] Specifically, a delivery pump is installed outside the pure water tank to deliver the pure water in the tank to the point of use, and a pressure gauge and a pressure relief valve are installed on its delivery pipeline.

[0021] Specifically, the concentrated water outlet pipe is equipped with an automatic flushing solenoid valve and a wastewater regulating valve. When the equipment is started, the wastewater regulating valve is closed first, the automatic flushing solenoid valve is opened, and external clean water enters the pipe to backwash the pipe and membrane inside the equipment. After flushing, the valve is closed, and the wastewater regulating valve is reopened to allow the concentrated water to enter the concentrated water tank.

[0022] Specifically, the wastewater regulating valve can control the amount of concentrated water discharged to adjust the pressure required for reverse osmosis. The reverse osmosis membrane needs a certain pressure for a certain amount of pure water to be discharged.

[0023] like Figure 1As shown in this example, preferably, the primary filtration device includes a quartz sand filter and an activated carbon filter. The quartz sand filter is connected to the raw water tank via a pipe, the quartz sand filter is connected to the activated carbon filter, and the activated carbon filter is connected to the secondary filtration device. Specifically, the raw water passes through the quartz sand filter and the activated carbon filter in sequence to filter out larger particulate matter such as suspended solids, colloids, silt, metal particles, and microorganisms in the raw water.

[0024] Specifically, during backwashing, the quartz sand filter and activated carbon filter discharge the wastewater into the sewer. If the wastewater has recycling value, it can also be collected separately in a water tank.

[0025] like Figure 1 As shown in this example, preferably, the secondary filtration device is a precision filter. The precision filter is connected to a booster pump via a pipeline, and the concentrated water return pipeline is connected to the pipeline. The precision filter further filters out smaller suspended solids, colloids, silt, metal particles, and microorganisms in the water to form pretreated water.

[0026] Specifically, precision filters can be existing precision filtration devices such as PAPE microporous precision filters, titanium rod filters, polyethersulfone filter cartridges, polytetrafluoroethylene filter cartridges, and microporous membrane cartridge filters.

[0027] like Figure 1 As shown in this example, preferably, the raw water tank, pure water tank, and concentrated water tank are all equipped with level switches to detect the liquid level in each tank and realize the start and stop of the entire primary pure water equipment.

[0028] like Figure 1 As shown in this example, preferably, the inlet and outlet pipes of the booster pump are equipped with pressure protection switches. The inlet pipe is a low-pressure protection switch, which controls the booster pump to start when the current processing water pressure is insufficient. The outlet pipe is a high-pressure protection switch, which shuts off the booster pump when the current processing water pressure is too high.

[0029] like Figure 1 As shown in this example, preferably, a booster pump return pipe is provided between the inlet and outlet pipes of the booster pump, and a return valve is provided on the booster pump return pipe, which can prevent the instantaneous water pressure from being too high when the booster pump starts, thus avoiding damage to the rubber ring inside the RO host.

[0030] The above description is merely a preferred embodiment of this utility model. The protection scope of this utility model is not limited to the above embodiments. All technical solutions falling within the scope of this utility model's concept are protected. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principle of this utility model should also be considered within the protection scope of this utility model.

Claims

1. A primary pure water equipment, characterized in that: The system includes a raw water tank, a primary filtration device, a secondary filtration device, a booster pump, an RO unit, a pure water tank, and a concentrated water tank, which are connected in sequence by pipes. The concentrated water outlet pipe on the RO unit is connected to the concentrated water tank. A concentrated water return pipe is installed on the concentrated water outlet pipe. A return control valve is installed on the concentrated water return pipe. The other end of the concentrated water return pipe is connected to the inlet pipe of the booster pump.

2. The primary pure water equipment according to claim 1, characterized in that: The primary filtration device includes a quartz sand filter and an activated carbon filter. The quartz sand filter is connected to the raw water tank via a pipe, the quartz sand filter is connected to the activated carbon filter, and the activated carbon filter is connected to the secondary filtration device.

3. The primary pure water equipment according to claim 1, characterized in that: The secondary filtration device is a precision filter, which is connected to a booster pump via a pipeline, and the concentrated water return pipeline is connected to the pipeline.

4. The primary pure water equipment according to claim 1, characterized in that: The raw water tank, pure water tank, and concentrated water tank are all equipped with level switches.

5. The primary pure water equipment according to claim 1, characterized in that: Pressure protection switches are installed on both the inlet and outlet pipes of the booster pump.

6. The primary pure water equipment according to claim 1, characterized in that: A return pipe is provided between the inlet and outlet pipes of the booster pump, and a return valve is provided on the return pipe.

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