Water-saving reverse osmosis water treatment device

Abstract

The utility model discloses a water-saving reverse osmosis water treatment device and belongs to the technical field of water purification devices. A water inlet at the front end of a filtering tank of the device is connected with a tap water pipeline, a purified water outlet of the filtering tank is connected with a reclaimed water tank, the reclaimed water tank is connected with a security filter, and the security filter is connected with a high-pressure pump through a second electric valve; the high-pressure pump is connected with the membrane shell; a pure water port of the membrane shell is connected with a pure water tank, a concentrated water port of the membrane shell is connected with a first electric valve, and the pure water tank is connected with a second electric valve; the second electric valve is a three-way valve; a conductivity sensor is arranged in the reclaimed water tank; the PLC respectively controls the conductivity sensor, the first electric valve, the second electric valve and the high-pressure pump; according to the utility model, the flushing operation on the membrane shell is adjusted according to the conductivity of reclaimed water, so that the water quality is improved, and the water-saving rate is also improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of water purification devices, in particular to a water-saving reverse osmosis water treatment device. Background Art

[0002] Reverse osmosis (RO) brine recirculation is a wastewater treatment technology that filters and concentrates wastewater through reverse osmosis (RO) membranes, achieving water recycling and reducing wastewater discharge, thus conserving water resources. However, while RO brine recirculation can solve the brine discharge problem and recover brine in the short term, over time, this method can increase the TDS and contaminants in the RO system's influent, increasing the system's burden and impacting its performance. In practical applications, when the raw water conductivity is around 1000 μS / cm, pure water consumption is high, the system recovery rate is generally only 40% to 50%, and the product water quality is poor. In particular, these elevated contaminants can significantly impact the RO membranes in the RO water treatment system, shortening their service life. If the RO membrane efficiency decreases, additional purified water flushing is required, resulting in a waste of pure water. Utility Model Content

[0003] The utility model overcomes the deficiencies of the prior art and proposes a water-saving reverse osmosis water treatment device to improve water quality and water-saving rate.

[0004] In order to achieve the above-mentioned purpose, the present invention is implemented through the following technical solutions.

[0005] A water-saving reverse osmosis water treatment device, comprising a filter tank, a membrane shell and a pure water tank; further comprising a first electric valve, a grey water tank, a safety filter, a high-pressure pump and a second electric valve; the water inlet at the front end of the filter tank is connected to the tap water pipe through an ultraviolet sterilizer, the clean water outlet of the filter tank is connected to the grey water tank, the grey water tank is connected to the safety filter, the safety filter is connected to the high-pressure pump through a second electric valve; the high-pressure pump is connected to the membrane shell; the pure water port of the membrane shell is connected to the pure water tank, the concentrate water port of the membrane shell is connected to the first electric valve, the first electric valve is connected to the concentrate water drainage pipe; the pure water tank is connected to the second electric valve; the first electric valve and the second electric valve are both three-way valves; a conductivity sensor is arranged in the grey water tank; a PLC controller controls the conductivity sensor, the first electric valve, the second electric valve and the high-pressure pump.

[0006] Furthermore, after the multiple filter tanks are connected in series, the water inlets at the front ends thereof are connected to the tap water pipe through the ultraviolet sterilizer, and the purified water outlets of the multiple filter tanks connected in series are connected to the grey water tank.

[0007] Furthermore, the first electric valve is connected to the ultraviolet sterilizer.

[0008] Furthermore, the water outlet of the ultraviolet sterilizer is connected to the grey water tank through a circulating flushing valve, and the circulating flushing valve is connected in parallel to the filter tank.

[0009] The beneficial effects of the present invention compared to the prior art are as follows:

[0010] This utility model proposes a water-saving reverse osmosis water treatment device. This device incorporates a greywater tank between the filter tank and the safety filter. This tank addresses the issue of unstable tap water supply and prevents frequent activation of the high-pressure pump. Furthermore, a programmable logic controller (PLC) controls the conductivity feedback of the greywater tank. When the conductivity falls below a certain value, the reverse osmosis concentrate is recycled from the UV inlet, sterilized by a UV sterilizer and reprocessed in multiple filter tanks before returning to the greywater tank. No wastewater is discharged during water production. When the conductivity exceeds a critical value, raw water replenishment is shut off, water production ceases, and water from the greywater tank is used to flush the first filter tank. Wastewater from the flushing tank is directly discharged. A membrane flush is performed before and after water production is complete. During membrane flushing, a circulating flushing valve is opened, and a high-pressure pump is used for long-term, high-flow, circulating flushing. Concentrate water is directly recycled to the greywater tank for flushing until the conductivity reaches the limit. When the conductivity reaches the limit, flushing ceases, and water from the greywater tank is used to flush the first filter tank. This operating mechanism improves filtration efficiency and significantly reduces compaction of the multi-media filter media in the first filter tank. A pure water inlet valve (opened when the second electric valve is connected to the pure water tank) is installed before the high-pressure pump to circulate pure water from the tank for regular flushing of the RO membranes. This setup ensures the normal operation of the membrane system, maintains excellent and stable water quality, and significantly improves water conservation. With raw water conductivity below 400μs / cm, recovery rates can reach over 80%. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 This is a schematic diagram of the structure of the water-saving reverse osmosis device of the utility model;

[0012] In the figure: 1 is the first electric valve, 2 is the ultraviolet sterilizer, 3 is the filter tank, 4 is the medium water tank, 5 is the safety filter, 6 is the high-pressure pump, 7 is the membrane shell, 8 is the pure water tank, 9 is the second electric valve, 10 is the tap water pipe, 11 is the concentrated water drainage pipe, 12 is the conductivity sensor, 13 is the PLC controller, and 14 is the circulating flushing valve. DETAILED DESCRIPTION

[0013] In order to make the technical problems, technical solutions, and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail with reference to the embodiments and accompanying drawings. It should be understood that the specific embodiments described herein are merely for the purpose of explaining the present invention and are not intended to limit the present invention. The technical solutions of the present invention will be described in detail below with reference to the embodiments and accompanying drawings, but the scope of protection is not limited thereto.

[0014] See also Figure 1 This embodiment provides a water-saving reverse osmosis device, comprising a first electric valve 1, three filter tanks 3, a membrane housing 7, a gray water tank 4, a high-pressure pump 6, a safety filter 5, a pure water tank 8, and an ultraviolet sterilizer 2. The three filter tanks 3 are connected in series, with their front water inlets connected to a tap water pipeline 10 via the ultraviolet sterilizer 2. The purified water outlets of the three series-connected filter tanks 3 are connected to the gray water tank 4, which is connected to the safety filter 5. The safety filter 5 is connected to the high-pressure pump 6 via a second electric valve 9. Both the first electric valve 1 and the second electric valve 9 are three-way valves. The high-pressure pump 6 is connected to the membrane housing 7; the pure water inlet of the membrane housing 7 is connected to the pure water tank 8, and the concentrated water outlet of the membrane housing 7 is connected to the first electric valve 1 before the ultraviolet sterilizer 2. The pure water tank 8 has a port connected to the second electric valve 9 before the high-pressure pump 6.

[0015] A conductivity sensor 12 is installed in the reclaimed water tank 4. This conductivity sensor 12 is connected to a PLC controller 13, which is in turn connected to the first electric valve 1, the second electric valve 9, and the flow control valve of the high-pressure pump 6. The PLC controller 13 controls the conductivity sensor 12, the first electric valve 1, the second electric valve 9, and the high-pressure pump 6.

[0016] The filter tank 3 is connected to a circulating flushing valve 14 .

[0017] The first electric valve 1 is also connected to the concentrated water drainage pipe 11 .

[0018] The working principle of this device is:

[0019] This device features a safety filter 5 between the filter tank 3 and the membrane housing 7. This further filters the reclaimed water before it enters the membrane housing 7, reducing the burden on the latter. A reclaimed water tank 4 is located between the filter tank 3 and the safety filter 5 to mitigate the instability of the tap water supply and prevent frequent activation of the high-pressure pump 6. A conductivity sensor 12 is also installed in the reclaimed water tank 4 to monitor the conductivity of the reclaimed water in real time and adjust it for subsequent cleaning operations. The PLC uses the conductivity of the reclaimed water tank 4 as feedback. When the conductivity is below a set value, the filtration system is operating normally, and the reverse osmosis concentrate can be reused at the inlet of the UV sterilizer 2 via the first electric valve 1. At this point, the PLC controller 13 controls the first electric valve 1 connected to the UV sterilizer 2 and the second electric valve 9 connected to the safety filter 5 to open positions. After reverse osmosis treatment in the membrane housing 7, the pure water enters the pure water tank 8, and the concentrate enters the UV sterilizer 2 for reuse.

[0020] When the conductivity value detected by the conductivity sensor 12 in the intermediate water tank 4 exceeds the critical value, the replenishment of concentrated water and raw water are both closed, the circulating flushing valve 14 is opened, and the water bypasses the filter tank 3 and directly enters the intermediate water tank 4. The water in the intermediate water tank is used to flush the first tank in the filter tank 3; the membrane flushing uses a high-flow, long-term circulating flushing by the high-pressure pump 6, and the wastewater generated by the flushing is recovered to the intermediate water tank through the first electric valve 1 and the pipeline. The membrane flushing is stopped, and the water in the intermediate water tank is used to flush the first tank in the filter tank 3 until the liquid level in the intermediate water tank reaches a low level, the raw water replenishment is turned on, and the equipment produces water normally.

[0021] A pure water inlet valve (i.e., the second electric valve connected to the pure water tank is open) is installed before the high-pressure pump to introduce pure water from the tank for circulating flushing, regularly flushing the RO membrane with pure water. When the second electric valve 9, connected to the safety filter 5, is closed and the side connected to the pure water tank 8 is open, the pure water flushing state is in effect. The circulating flushing valve 14 opens, allowing water to bypass the filter tank 3 and enter the intermediate water tank 4 directly. The previous pure water flushing process generated wastewater that was directly discharged, consuming a large amount of pure water per flush. This device uses a pure water circulating flushing system, with water only discharged once the conductivity reaches a certain value, significantly increasing the system's recovery rate.

[0022] The above content is a further detailed description of the present invention in combination with a specific preferred embodiment. It cannot be determined that the specific embodiments of the present invention are limited to this. For ordinary technicians in the technical field to which the present invention belongs, they can make several simple deductions or substitutions without departing from the present invention, which should be regarded as belonging to the present invention and the scope of patent protection determined by the submitted claims.

Claims

1. A water-saving reverse osmosis water treatment device, comprising a filter tank (3), a membrane shell (7) and a pure water tank (8); characterized in that: It also includes a first electric valve (1), a medium water tank (4), a safety filter (5), a high-pressure pump (6) and a second electric valve (9); the water inlet at the front end of the filter tank (3) is connected to the tap water pipe (10) through the ultraviolet sterilizer (2), the clean water outlet of the filter tank (3) is connected to the medium water tank (4), the medium water tank (4) is connected to the safety filter (5), and the safety filter (5) is connected to the high-pressure pump (6) through the second electric valve (9); the high-pressure pump (6) is connected to the membrane shell (7); the membrane shell The pure water outlet of the membrane shell (7) is connected to the pure water tank (8), the concentrated water outlet of the membrane shell (7) is connected to the first electric valve (1), and the first electric valve (1) is connected to the concentrated water drainage pipe (11); the pure water tank (8) is connected to the second electric valve (9); the first electric valve (1) and the second electric valve (9) are both three-way valves; a conductivity sensor (12) is set in the intermediate water tank (4); and a PLC controller (13) controls the conductivity sensor (12), the first electric valve (1), the second electric valve (9) and the high-pressure pump (6).

2. A water-saving reverse osmosis water treatment device according to claim 1, characterized in that: After the plurality of filter tanks (3) are sequentially connected in series, the water inlets at their front ends are connected to the tap water pipe (10) via the ultraviolet sterilizer (2), and the purified water outlets of the plurality of filter tanks (3) connected in series are connected to the reclaimed water tank (4).

3. A water-saving reverse osmosis water treatment device according to claim 1, characterized in that: The first electric valve (1) is connected to the ultraviolet sterilizer (2).

4. A water-saving reverse osmosis water treatment device according to claim 1, characterized in that: The water outlet of the ultraviolet sterilizer (2) is connected to the intermediate water tank (4) via a circulating flushing valve (14), and the circulating flushing valve (14) is connected in parallel to the filter tank (3).

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