# US 10,370,265 B2 · Water purification system

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- Number: US 10,370,265 B2
- Document ID: US10370265B2
- Status: Granted
- Kind: B2
- Application number: 15/665,100
- Filed: 2017-07-31
- Published: 2017-12-07
- Granted: 2019-08-06
- Earliest claimed: 2015-01-30
- Assignees: Foshan Shunde Midea Water Dispenser Mfg. Co., Ltd.; Midea Group Co., Ltd.
- Applicants: Foshan Shunde Midea Water Dispenser Mfg. Co., Ltd.; Midea Group Co., Ltd.
- Inventors: Xuegang Cai; Lei Liu; Xingzhi Zhang
- Web page: https://patentgrep.com/patent/US10370265B2

## CPC

- C02F 1/28: by sorption (using ion-exchange C02F1/42; sorbent compositions B01J)
- B01D 61/025: {Reverse osmosis; Hyperfiltration}
- B01D 61/027: {Nanofiltration}
- B01D 61/04: Feed pretreatment
- B01D 61/08: Apparatus therefor
- B01D 61/12: Controlling or regulating
- B01D 61/145: {Ultrafiltration}
- B01D 61/147: {Microfiltration}
- B01D 61/58: Multistep processes
- C02F 1/44: by dialysis, osmosis or reverse osmosis {(general membrane separation processes B01D61/00, membrane modules B01D63/00, electrodialysis C02F1/4693, combination of membrane modules and bioreactors C02F3/1268)}
- C02F 1/441: {by reverse osmosis}
- C02F 1/442: {by nanofiltration}
- C02F 1/444: {by ultrafiltration or microfiltration}
- B01D 2311/04: Specific process operations in the feed stream; Feed pretreatment
- B01D 2311/06: Specific process operations in the permeate stream
- B01D 2313/501: Permeate storage tanks
- B01D 2313/60: Specific sensors or sensor arrangements
- B01D 2313/903: Integrated control or detection device
- C02F 1/001: {Processes for the treatment of water whereby the filtration technique is of importance (C02F1/44 takes precedence; construction of filters in general B01D24/00 - B01D41/00)}
- C02F 1/283: {using coal, charred products, or inorganic mixtures containing them}
- C02F 2209/005: Processes using a programmable logic controller [PLC]
- C02F 2209/05: Conductivity or salinity
- C02F 2209/445: Filter life
- C02F: TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE (separation in general B01D; special arrangements on waterborne vessels of installations for treating water, waste water or sewage, e.g. for producing fresh water, B63J; adding materials to water to prevent corrosion C23F; treating radioactively-contaminated liquids G21F9/04; regeneration of reactants for recirculation into processes, see the relevant places for the processes)
- B01D: SEPARATION (separating solids from solids by wet methods B03B, B03D; by pneumatic jigs or tables B03B; by other dry methods B07; magnetic or electrostatic separation of solid materials from solid materials or fluids, separation by high-voltage electric fields B03C; centrifuges, vortex apparatus B04; presses per se for squeezing-out liquid from liquid-containing material B30B9/02; treatment of water C02F, e.g. softening by ion-exchange C02F1/42; {arrangements of air intake cleaners in gas turbine plants F02C7/05} ; arrangements or mounting of filters in air-conditioning, air-humidification or ventilation F24F13/28)

## Abstract

A water purification system includes: a composite filter cartridge including a pretreatment filter cartridge and a filter membrane assembly; a raw water inlet pipe; a pure water outlet pipe; a pretreated water pipe; a booster pump; a water quality detecting device disposed to the raw water inlet pipe and/or the pure water outlet pipe and configured to detect water quality in the raw water inlet pipe and the pure water outlet pipe; and a control device connected to the water quality detecting device and configured to determine service life of the composite filter cartridge and/or judge whether the composite filter cartridge has lost efficacy according to information detected by the water quality detecting device.

## Claims

### Claim 1

A water purification system, comprising:
a composite filter cartridge comprising a pretreatment filter cartridge and a filter membrane assembly inserted into the pretreatment filter cartridge, the composite filter cartridge being provided with a raw water inlet, a pretreated water outlet connected to the pretreatment filter cartridge, a pretreated water inlet connected to the filter membrane assembly, a pure water outlet and a waste water outlet;
a raw water inlet pipe connected to the raw water inlet;
a pure water outlet pipe connected to the pure water outlet;
a waste water outlet pipe connected to the waste water outlet;
a pretreated water pipe connected to the pretreated water outlet and the pretreated water inlet, respectively;
a booster pump connected to the pretreated water pipe;
a first conductivity sensor connected to the raw water inlet pipe and a second conductivity sensor connected to the pure water outlet pipe, wherein each of the first conductivity sensor and the second conductivity sensor is configured to detect a water flow impedance and generate a frequency signal according to the water flow impedance; and
a single chip microcomputer that is electrically connected to the first conductivity sensor and the second conductivity sensor and configured to receive the frequency signals from the first conductivity sensor and the second conductivity sensor, determine a total amount of dissolved solid materials in the water flow according to the frequency signals, and determine a remaining service life of the composite filter cartridge according to the total amount of dissolved solid materials and a predetermined service life of the composite filter cartridge.

### Claim 2 (depends on 1)

The water purification system according to claim 1, further comprising a display device connected to the single chip microcomputer configured to display the remaining service life of the composite filter cartridge.

### Claim 3 (depends on 1)

The water purification system according to claim 1, further comprising a flexible water bag disposed to the pure water outlet pipe.

### Claim 4 (depends on 1)

The water purification system according to claim 1, further comprising a waste water ratio control valve disposed to the waste water outlet pipe and connected to the single chip microcomputer.

### Claim 5 (depends on 1)

The water purification system according to claim 1, wherein the filter membrane assembly comprises a central water collecting pipe, and one selected from the group consisting of a reverse osmosis membrane, an ultrafiltration membrane and a nanofiltration membrane wound upon the central water collecting pipe.