CN210457735U

CN210457735U - Double-membrane filtration water purifying device

Info

Publication number: CN210457735U
Application number: CN201921012728.0U
Authority: CN
Inventors: 文旭东; 陈兴平
Original assignee: Sichuan Xuebao Mineral Water Co ltd
Current assignee: Sichuan Xuebao Mineral Water Co ltd
Priority date: 2019-07-02
Filing date: 2019-07-02
Publication date: 2020-05-05
Anticipated expiration: 2029-07-02

Abstract

The utility model discloses a double-membrane filtration water purifying device, belonging to the technical field of water purification, wherein the water outlet end of a master control valve is connected with a water inlet arranged at the concentrated water side of an ultrafiltration membrane device through a valve fifteen; the water outlet end of the master control valve is connected with a water inlet arranged on the concentrated water side of the reverse osmosis membrane device through a valve sixteen; the water outlet of the ultrafiltration membrane device arranged on the clean water side is connected with the first water storage tank through a valve seventeen; the reverse osmosis membrane device is arranged at a water outlet of the clean water side and is connected with the first water storage tank through a valve eighteen; concentrated water discharging ports are formed in the concentrated water sides of the ultrafiltration membrane device and the reverse osmosis membrane device, and concentrated water is discharged outwards through concentrated water discharging valves. The utility model discloses a two membrane filtration purifier can dispose the mineral water of arbitrary mineral substance concentration as required.

Description

Double-membrane filtration water purifying device

Technical Field

The utility model belongs to the technical field of the water purification, specifically speaking relates to a two membrane filtration purifier.

Background

The existing water purifying and filtering device generally comprises a raw water tank, a raw water pump, a quartz sand filter, an activated carbon filter, a precision filter, a membrane filter and a water storage tank; raw water passes through a raw water pump, a quartz sand filter, an activated carbon filter, a precision filter and a membrane filter from a raw water tank in sequence, is purified and then is stored in a water storage tank; the raw water tank is used for storing raw water to be treated, and is used for ensuring continuous and stable operation of the subsequent process of the process; the primary function of the raw water pump is to maintain the water supply pressure of the system and stabilize the water supply quantity of the system; the quartz sand filter is a filter with a filter material adopting quartz sand as a filler, is beneficial to removing impurities in water, has the advantages of small filtration resistance, large specific surface area, strong acid and alkali resistance, good pollution resistance and the like, can effectively remove suspended matters in water, and has an obvious removing effect on pollutants such as colloids, iron, organic matters, pesticides, manganese, bacteria, viruses and the like in water; meanwhile, the quartz sand filter has the characteristics of simple structure, automatic control in operation, large treatment flow, few backflushing times, high filtering efficiency, small resistance, convenience in operation and maintenance and the like. The work of the activated carbon filter is completed through the carbon bed, the activated carbon particles forming the carbon bed have very many micropores and huge specific surface area, and have very strong physical adsorption capacity, and organic pollutants in water are effectively adsorbed by the activated carbon when the water passes through the carbon bed; in addition, the amorphous part of the surface of the activated carbon is provided with a plurality of oxygen-containing tube energy groups, so that organic pollutants in water passing through the carbon bed are effectively adsorbed by the activated carbon; the activated carbon filter is a common water treatment device, and can effectively ensure the service life of a post-stage device when used as a pretreatment of a water treatment desalination system, improve the quality of effluent water and prevent pollution. The shell of the precise filter cylinder is generally made of stainless steel, tubular filter elements such as PP melt-blown filter elements, wire-fired filter elements, folded filter elements, titanium filter elements, activated carbon filter elements and the like are adopted as filter elements inside the precise filter cylinder, different filter elements are selected according to different filter media and design processes so as to meet the requirement of effluent quality, and the device is widely applied to the water treatment industry and is ideal equipment for water purification treatment. The membrane filter generally comprises an ultrafiltration membrane device or a reverse osmosis membrane device, the aperture of a filter membrane of the ultrafiltration membrane device is 0.001-0.02 micron, and most of bacteria and viruses can be filtered under the aperture. Theoretically, only mineral and water molecules in the water can be left. The precision of the filter membrane of the reverse osmosis membrane device is higher and is 0.0001-0.001 micron. Under the aperture, only water molecules can pass through the filter, and the rest substances can be intercepted, namely the obtained water is pure distilled water.

The existing water purifying and filtering device adopts an ultrafiltration membrane device to produce mineral water with certain concentration of minerals or adopts a reverse osmosis membrane device to produce purified water, but the traditional water purifying and filtering device does not combine the ultrafiltration membrane device and the reverse osmosis membrane device to produce mineral water containing different concentrations of minerals according to requirements.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a two membrane filtration purifier to above-mentioned weak point, aim at solving current water purification filter and can't produce the mineral water scheduling problem that contains different concentration mineral substances as required. In order to achieve the above object, the utility model provides a following technical scheme:

a double-membrane filtration water purification device comprises a raw water tank 1, a raw water pump 2, a quartz sand filter 3, an activated carbon filter 4, a precision filter 5, a post-positioned master valve 56, a post-positioned master pump 57, a master valve 58, an ultrafiltration membrane device 59, a reverse osmosis membrane device 60 and a first water storage tank 61; the water outlet of the raw water tank 1 is connected with the water inlet of the raw water pump 2; the water outlet of the raw water pump 2 is connected with a water inlet arranged at the top of the quartz sand filter 3 through a first valve 101; the water outlet of the lower part of the quartz sand filter 3 is connected with the water inlet of the top of the activated carbon filter 4 through a second valve 102; the water outlet of the lower part of the activated carbon filter 4 is connected with the water inlet of the precision filter 5 through a third valve 103; the water outlet of the precision filter 5, the postposition master valve 56, the postposition master pump 57 and the master valve 58 are connected in sequence through pipelines; the water outlet end of the master control valve 58 is connected with a water inlet arranged on the concentrated water side of the ultrafiltration membrane device 59 through a valve fifteen 115; the water outlet end of the master control valve 58 is connected with the water inlet arranged at the concentrated water side of the reverse osmosis membrane device 60 through a sixteen valve 116; the ultrafiltration membrane device 59 is arranged at the water outlet of the clean water side and is connected with the first water storage tank 61 through a valve seventeen 117; the reverse osmosis membrane device 60 is arranged at the water outlet of the clean water side and is connected with the first water storage tank 61 through a valve eighteen 118; concentrated water discharge ports are formed in the concentrated water sides of the ultrafiltration membrane device 59 and the reverse osmosis membrane device 60, and concentrated water is discharged outwards through concentrated water discharge valves. According to the structure, when mineral water with certain concentration mineral substances needs to be prepared, the raw water pump 2, the valve I101, the valve II 102, the valve III 103, the rear main valve 56, the rear main pump 57, the main control valve 58, the valve fifteen 115, the valve seventeen 117, the valve sixteen 116 and the valve eighteen 118 are opened, the other valves are closed, and the raw water passes through the raw water pump, the quartz sand filter, the activated carbon filter and the precision filter from the raw water tank in sequence to become primary filter water; the primary filter water sequentially passes through the post-positioned main valve 56, the post-positioned main pump 57, the main control valve 58 and the ultrafiltration membrane device 59 to form ultrafiltration water, the primary filter water sequentially passes through the post-positioned main valve 56, the post-positioned main pump 57, the main control valve 58 and the reverse osmosis membrane device 60 to form purified water, and the mineral water with controllable mineral concentration is mixed by the ultrafiltration water and the purified water through the control valve seventeen 117 and the opening degree of the valve eighteen 118 and is stored in the first water storage tank 61. Concentrated water discharge ports are formed in the concentrated water sides of the ultrafiltration membrane device 59 and the reverse osmosis membrane device 60, and concentrated water is discharged outwards through concentrated water discharge valves.

Further, a second water storage tank 62 and a third water storage tank 63 are also included; a first branch pipe 71 is arranged on a pipeline between the water outlet of the ultrafiltration membrane device 59 and the valve seventeen 117; the first branch 71 leads to the second storage tank 62; a second branch pipe 72 is arranged on a pipeline between the water outlet of the reverse osmosis membrane device 60 and the eighteen 118 valves; the second branch 72 leads to a third storage tank 63. As can be seen from the above structure, the ultrafiltrated water is discharged from the ultrafiltration membrane device 59, and is directly stored in the second water storage tank 62 through the first branch pipe 71, and is used as mineral water with determined concentration for standby; the purified water from the reverse osmosis membrane 60 is directly stored in the third storage tank 63 through the second branch pipe 72, and is used as the purified water for standby and is also a source of clean water supplied to the washing pump 54; the ultrafiltered water and the purified water are mixed into mineral water with controllable mineral concentration and stored in the first water storage tank 61.

Further, a first flow meter 73 is arranged on a pipeline between the valve seventeen 117 and the first water storage tank 61; a second flow meter 74 is arranged on a pipeline between the valve eighteen 118 and the first water storage tank 61; the first water storage tank 61 is provided with a first conductivity tester, the second water storage tank 62 is provided with a second conductivity tester, and the third water storage tank 63 is provided with a third conductivity tester for testing the conductivity of the water. As can be seen from the above-mentioned structure, the first flow meter 73 and the second flow meter 74 can accurately measure the respective flow rates of the mixture of the ultrafiltration water and the purified water flowing into the first storage tank 61, thereby controlling the opening degrees of the valves seventeen 117 and eighteen 118 according to the requirement of the mineral water with the mineral concentration to be prepared, and ensuring that the concentration of the mineral water stored in the first storage tank 61 is controllable; first conductivity tester monitors first storage water tank 61 mineral concentration, and second conductivity tester monitors second storage water tank 62 mineral concentration, and third conductivity tester monitors third storage water tank 63 mineral concentration, ensures that the conductivity of quality of water meets the requirements.

Furthermore, a valve twenty-seven 127 is arranged between the first branch pipe 71 and the water outlet of the ultrafiltration membrane device 59; a fourth conductivity tester is arranged on a pipeline between the twenty-seventh valve 127 and the water outlet of the ultrafiltration membrane device 59; a valve twenty-eight 128 is arranged between the second branch pipe 72 and the water outlet of the reverse osmosis membrane device 60; a fifth conductivity tester is arranged on a pipeline between the twenty-eight 128 valve and the water outlet of the reverse osmosis membrane device 60; a first return pipe 75 is arranged on a pipeline between the twenty-seven valve 127 and the water outlet of the ultrafiltration membrane device 59; the first return line 75 opens into a line between the post-head valve 56 and the post-head pump 57; a valve twenty-nine 129 is arranged on the first return pipe 75; a second return pipe 76 is arranged on a pipeline between the twenty-eight 128 valve and the water outlet of the reverse osmosis membrane device 60; the second return line 76 opens into the line between the post-main valve 56 and the post-main pump 57; the second return pipe 76 is provided with a valve thirty 130. According to the structure, when the fourth conductivity tester tests that the conductivity of the ultrafiltration water from the ultrafiltration membrane device 59 does not meet the requirement, the twenty-seventh valve 127 is closed, the twenty-ninth valve 129 is opened, and the ultrafiltration water returns to the inlet of the post-positioned master pump 57 through the first return pipe 75, so that the next working procedure is avoided; when the fourth conductivity tester tests that the conductivity of the ultrafiltration water from the ultrafiltration membrane device 59 meets the requirement, the valve twenty-seven 127 is opened, the valve twenty-nine 129 is closed, and the ultrafiltration water enters the next procedure; when the fifth conductivity tester tests that the conductivity of the purified water discharged from the reverse osmosis membrane 60 does not meet the requirement, the valve twenty-eight 128 is closed, the valve thirty-130 is opened, and the purified water returns to the inlet of the rear main pump 57 through the second return pipe 76 to avoid entering the next working procedure; when the fifth conductivity tester tests that the conductivity of the purified water discharged from the reverse osmosis membrane 60 meets the requirement, the valve twenty-eight 128 is opened, the valve thirty-130 is closed, and the purified water enters the next procedure; the backflow through the first backflow pipe 75 and the second backflow pipe 76 avoids the phenomenon that the production efficiency is influenced because the equipment is stopped due to short-time unqualified water quality; secondly, a loop is formed by the first return pipe 75 and the ultrafiltration membrane device 59, when the ultrafiltration membrane device 59 is filled with the liquid medicine, the post-positioned master pump 57 is started, and the liquid medicine is rolled to soak the ultrafiltration membrane device 59; the second return pipe 76 and the reverse osmosis membrane 60 form a loop, when the reverse osmosis membrane 60 is filled with the liquid medicine, the post-positioned master pump 57 is started, so that the liquid medicine is rolled to soak the reverse osmosis membrane 60, and the liquid medicine is cleaned more fully and cleanly.

Further, an ozone generator 8 is also included; the ozone generator 8 is used to sterilize the water flowing into the first, second and third

water storage tanks

61, 62 and 63. As can be seen from the above-described structure, the ozone generator 8 disinfects the water in the first, second, and third

water storage tanks

61, 62, and 63 again.

Further, the bottom parts of the raw water tank 1, the quartz sand filter 3 and the activated carbon filter 4 are provided with drain ports, and drain valves are arranged on the drain ports; and a liquid level meter is arranged on the raw water tank 1 and is used for monitoring the water quantity in the raw water tank 1. By the structure, the liquid level meter monitors the raw water quantity of the raw water tank 1, when the raw water is not stored in the raw water tank, the continuous and stable operation of the subsequent process of the process cannot be ensured, and the whole equipment is stopped.

Further, the water outlet of the raw water tank 1 is higher than the bottom of the raw water tank 1 by a certain distance, a filter screen is arranged on the water outlet of the raw water tank 1, and the filtering surface of the filter screen inclines towards the bottom of the raw water tank 1. According to the structure, the water outlet of the original water tank 1 is higher than the bottom of the original water tank 1 by a certain distance, so that large-particle impurities can sink to the bottom of the original water tank 1, the filter surface of the filter screen inclines towards the bottom of the original water tank 1, and the filter screen is not easy to block by the large-particle impurities.

The utility model has the advantages that:

1. the utility model discloses a double-membrane filtration water purification device, wherein the water outlet end of a master control valve is connected with a water inlet arranged at the concentrated water side of an ultrafiltration membrane device through a valve fifteen; the water outlet end of the master control valve is connected with a water inlet arranged on the concentrated water side of the reverse osmosis membrane device through a valve sixteen; the water outlet of the ultrafiltration membrane device arranged on the clean water side is connected with the first water storage tank through a valve seventeen; the reverse osmosis membrane device is arranged at a water outlet of the clean water side and is connected with the first water storage tank through a valve eighteen; concentrated water discharging ports are formed in the concentrated water sides of the ultrafiltration membrane device and the reverse osmosis membrane device, and concentrated water is discharged outwards through concentrated water discharging valves. The utility model discloses a two membrane filtration purifier can dispose the mineral water of arbitrary mineral substance concentration as required.

Drawings

FIG. 1 is a schematic structural view of the present invention;

in the drawings: 1-raw water tank, 2-raw water pump, 3-quartz sand filter, 4-activated carbon filter, 5-precision filter, 56-post-positioned master valve, 57-post-positioned master pump, 58-master control valve, 59-ultrafiltration membrane device, 60-reverse osmosis membrane device, 61-first water storage tank, 62-second water storage tank, 63-third water storage tank, 71-first branch pipe, 72-second branch pipe, 73-first flowmeter, 74-second flowmeter, 75-first return pipe, 76-second return pipe, 8-ozone generator, 101-valve I, 102-valve II, 103-valve III, 115-valve fifteen, 116-valve sixteen, 117-valve seventeen, 118-valve eighteen, 127-valve seventeen, 128-valve dioctadecyl, 129-valve twenty-nine, 130-valve thirty.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments, but the present invention is not limited to the following embodiments.

The first embodiment is as follows:

see figure 1. A double-membrane filtration water purification device comprises a raw water tank 1, a raw water pump 2, a quartz sand filter 3, an activated carbon filter 4, a precision filter 5, a post-positioned master valve 56, a post-positioned master pump 57, a master valve 58, an ultrafiltration membrane device 59, a reverse osmosis membrane device 60 and a first water storage tank 61; the water outlet of the raw water tank 1 is connected with the water inlet of the raw water pump 2; the water outlet of the raw water pump 2 is connected with a water inlet arranged at the top of the quartz sand filter 3 through a first valve 101; the water outlet of the lower part of the quartz sand filter 3 is connected with the water inlet of the top of the activated carbon filter 4 through a second valve 102; the water outlet of the lower part of the activated carbon filter 4 is connected with the water inlet of the precision filter 5 through a third valve 103; the water outlet of the precision filter 5, the postposition master valve 56, the postposition master pump 57 and the master valve 58 are connected in sequence through pipelines; the water outlet end of the master control valve 58 is connected with a water inlet arranged on the concentrated water side of the ultrafiltration membrane device 59 through a valve fifteen 115; the water outlet end of the master control valve 58 is connected with the water inlet arranged at the concentrated water side of the reverse osmosis membrane device 60 through a sixteen valve 116; the ultrafiltration membrane device 59 is arranged at the water outlet of the clean water side and is connected with the first water storage tank 61 through a valve seventeen 117; the reverse osmosis membrane device 60 is arranged at the water outlet of the clean water side and is connected with the first water storage tank 61 through a valve eighteen 118; concentrated water discharge ports are formed in the concentrated water sides of the ultrafiltration membrane device 59 and the reverse osmosis membrane device 60, and concentrated water is discharged outwards through concentrated water discharge valves. According to the structure, when mineral water with certain concentration mineral substances needs to be prepared, the raw water pump 2, the valve I101, the valve II 102, the valve III 103, the rear main valve 56, the rear main pump 57, the main control valve 58, the valve fifteen 115, the valve seventeen 117, the valve sixteen 116 and the valve eighteen 118 are opened, the other valves are closed, and the raw water passes through the raw water pump, the quartz sand filter, the activated carbon filter and the precision filter from the raw water tank in sequence to become primary filter water; the primary filter water sequentially passes through the post-positioned main valve 56, the post-positioned main pump 57, the main control valve 58 and the ultrafiltration membrane device 59 to form ultrafiltration water, the primary filter water sequentially passes through the post-positioned main valve 56, the post-positioned main pump 57, the main control valve 58 and the reverse osmosis membrane device 60 to form purified water, and the mineral water with controllable mineral concentration is mixed by the ultrafiltration water and the purified water through the control valve seventeen 117 and the opening degree of the valve eighteen 118 and is stored in the first water storage tank 61. Concentrated water discharge ports are formed in the concentrated water sides of the ultrafiltration membrane device 59 and the reverse osmosis membrane device 60, and concentrated water is discharged outwards through concentrated water discharge valves.

Example two:

A second water storage tank 62 and a third water storage tank 63 are also included; a first branch pipe 71 is arranged on a pipeline between the water outlet of the ultrafiltration membrane device 59 and the valve seventeen 117; the first branch 71 leads to the second storage tank 62; a second branch pipe 72 is arranged on a pipeline between the water outlet of the reverse osmosis membrane device 60 and the eighteen 118 valves; the second branch 72 leads to a third storage tank 63. As can be seen from the above structure, the ultrafiltrated water is discharged from the ultrafiltration membrane device 59, and is directly stored in the second water storage tank 62 through the first branch pipe 71, and is used as mineral water with determined concentration for standby; the purified water from the reverse osmosis membrane 60 is directly stored in the third storage tank 63 through the second branch pipe 72, and is used as the purified water for standby and is also a source of clean water supplied to the washing pump 54; the ultrafiltered water and the purified water are mixed into mineral water with controllable mineral concentration and stored in the first water storage tank 61.

Example three:

A first flow meter 73 is arranged on a pipeline between the valve seventeen 117 and the first water storage tank 61; a second flow meter 74 is arranged on a pipeline between the valve eighteen 118 and the first water storage tank 61; the first water storage tank 61 is provided with a first conductivity tester, the second water storage tank 62 is provided with a second conductivity tester, and the third water storage tank 63 is provided with a third conductivity tester for testing the conductivity of the water. As can be seen from the above-mentioned structure, the first flow meter 73 and the second flow meter 74 can accurately measure the respective flow rates of the mixture of the ultrafiltration water and the purified water flowing into the first storage tank 61, thereby controlling the opening degrees of the valves seventeen 117 and eighteen 118 according to the requirement of the mineral water with the mineral concentration to be prepared, and ensuring that the concentration of the mineral water stored in the first storage tank 61 is controllable; first conductivity tester monitors first storage water tank 61 mineral concentration, and second conductivity tester monitors second storage water tank 62 mineral concentration, and third conductivity tester monitors third storage water tank 63 mineral concentration, ensures that the conductivity of quality of water meets the requirements.

A valve twenty-seven 127 is arranged between the first branch pipe 71 and the water outlet of the ultrafiltration membrane device 59; a fourth conductivity tester is arranged on a pipeline between the twenty-seventh valve 127 and the water outlet of the ultrafiltration membrane device 59; a valve twenty-eight 128 is arranged between the second branch pipe 72 and the water outlet of the reverse osmosis membrane device 60; a fifth conductivity tester is arranged on a pipeline between the twenty-eight 128 valve and the water outlet of the reverse osmosis membrane device 60; a first return pipe 75 is arranged on a pipeline between the twenty-seven valve 127 and the water outlet of the ultrafiltration membrane device 59; the first return line 75 opens into a line between the post-head valve 56 and the post-head pump 57; a valve twenty-nine 129 is arranged on the first return pipe 75; a second return pipe 76 is arranged on a pipeline between the twenty-eight 128 valve and the water outlet of the reverse osmosis membrane device 60; the second return line 76 opens into the line between the post-main valve 56 and the post-main pump 57; the second return pipe 76 is provided with a valve thirty 130. According to the structure, when the fourth conductivity tester tests that the conductivity of the ultrafiltration water from the ultrafiltration membrane device 59 does not meet the requirement, the twenty-seventh valve 127 is closed, the twenty-ninth valve 129 is opened, and the ultrafiltration water returns to the inlet of the post-positioned master pump 57 through the first return pipe 75, so that the next working procedure is avoided; when the fourth conductivity tester tests that the conductivity of the ultrafiltration water from the ultrafiltration membrane device 59 meets the requirement, the valve twenty-seven 127 is opened, the valve twenty-nine 129 is closed, and the ultrafiltration water enters the next procedure; when the fifth conductivity tester tests that the conductivity of the purified water discharged from the reverse osmosis membrane 60 does not meet the requirement, the valve twenty-eight 128 is closed, the valve thirty-130 is opened, and the purified water returns to the inlet of the rear main pump 57 through the second return pipe 76 to avoid entering the next working procedure; when the fifth conductivity tester tests that the conductivity of the purified water discharged from the reverse osmosis membrane 60 meets the requirement, the valve twenty-eight 128 is opened, the valve thirty-130 is closed, and the purified water enters the next procedure; the backflow through the first backflow pipe 75 and the second backflow pipe 76 avoids the phenomenon that the production efficiency is influenced because the equipment is stopped due to short-time unqualified water quality; secondly, a loop is formed by the first return pipe 75 and the ultrafiltration membrane device 59, when the ultrafiltration membrane device 59 is filled with the liquid medicine, the post-positioned master pump 57 is started, and the liquid medicine is rolled to soak the ultrafiltration membrane device 59; the second return pipe 76 and the reverse osmosis membrane 60 form a loop, when the reverse osmosis membrane 60 is filled with the liquid medicine, the post-positioned master pump 57 is started, so that the liquid medicine is rolled to soak the reverse osmosis membrane 60, and the liquid medicine is cleaned more fully and cleanly.

Also comprises an ozone generator 8; the ozone generator 8 is used to sterilize the water flowing into the first, second and third

water storage tanks

61, 62, and 63 again.

The bottom parts of the raw water tank 1, the quartz sand filter 3 and the activated carbon filter 4 are provided with drain ports, and drain valves are arranged on the drain ports; and a liquid level meter is arranged on the raw water tank 1 and is used for monitoring the water quantity in the raw water tank 1. By the structure, the liquid level meter monitors the raw water quantity of the raw water tank 1, when the raw water is not stored in the raw water tank, the continuous and stable operation of the subsequent process of the process cannot be ensured, and the whole equipment is stopped.

The water outlet of the raw water tank 1 is higher than the bottom of the raw water tank 1 by a certain distance, a filter screen is arranged on the water outlet of the raw water tank 1, and the filter surface of the filter screen inclines towards the bottom of the raw water tank 1. According to the structure, the water outlet of the original water tank 1 is higher than the bottom of the original water tank 1 by a certain distance, so that large-particle impurities can sink to the bottom of the original water tank 1, the filter surface of the filter screen inclines towards the bottom of the original water tank 1, and the filter screen is not easy to block by the large-particle impurities.

The above only is the preferred embodiment of the present invention, not limiting the scope of the present invention, all the equivalent structures or equivalent flow changes made by the contents of the specification and the drawings, or directly or indirectly applied to other related technical fields, are included in the same way in the protection scope of the present invention.

Claims

1. A double-membrane filtration water purification device comprises a raw water tank (1), a raw water pump (2), a quartz sand filter (3), an activated carbon filter (4), a precision filter (5), a post-positioned main valve (56), a post-positioned main pump (57), a main control valve (58), an ultrafiltration membrane device (59), a reverse osmosis membrane device (60) and a first water storage tank (61); the water outlet of the raw water tank (1) is connected with the water inlet of the raw water pump (2); the water outlet of the raw water pump (2) is connected with the water inlet arranged at the top of the quartz sand filter (3) through a first valve (101); the water outlet of the lower part of the quartz sand filter (3) is connected with the water inlet of the top of the activated carbon filter (4) through a second valve (102); the water outlet of the lower part of the activated carbon filter (4) is connected with the water inlet of the precision filter (5) through a third valve (103); the method is characterized in that: the water outlet of the precision filter (5), the rear main valve (56), the rear main pump (57) and the main control valve (58) are connected in sequence through pipelines; the water outlet end of the master control valve (58) is connected with a water inlet arranged on the concentrated water side of the ultrafiltration membrane device (59) through a valve fifteen (115); the water outlet end of the master control valve (58) is connected with a water inlet arranged on the concentrated water side of the reverse osmosis membrane device (60) through a sixteen (116) valve; the ultrafiltration membrane device (59) is arranged at a water outlet at the clean water side and is connected with the first water storage tank (61) through a valve seventeen (117); the reverse osmosis membrane device (60) is arranged at a water outlet at the clean water side and is connected with the first water storage tank (61) through a valve eighteen (118); concentrated water discharging ports are formed in the concentrated water sides of the ultrafiltration membrane device (59) and the reverse osmosis membrane device (60), and concentrated water is discharged outwards through concentrated water discharging valves.

2. The double-membrane filtration water purification unit of claim 1, wherein: the water storage device also comprises a second water storage tank (62) and a third water storage tank (63); a first branch pipe (71) is arranged on a pipeline between the water outlet of the ultrafiltration membrane device (59) and the valve seventeen (117); the first branch (71) leads to a second storage tank (62); a second branch pipe (72) is arranged on a pipeline between the water outlet of the reverse osmosis membrane device (60) and the eighteen (118) valves; the second branch (72) leads to a third storage tank (63).

3. The double-membrane filtration water purification unit of claim 2, wherein: a first flow meter (73) is arranged on a pipeline between the valve seventeen (117) and the first water storage tank (61); a second flow meter (74) is arranged on a pipeline between the valve eighteen (118) and the first water storage tank (61); the first water storage tank (61) is provided with a first conductivity tester, the second water storage tank (62) is provided with a second conductivity tester, and the third water storage tank (63) is provided with a third conductivity tester for testing the conductivity of water quality.

4. The double-membrane filtration water purification unit of claim 3, wherein: a twenty-seventh valve (127) is arranged between the first branch pipe (71) and the water outlet of the ultrafiltration membrane device (59); a fourth conductivity tester is arranged on a pipeline between the twenty-seventh valve (127) and the water outlet of the ultrafiltration membrane device (59); a valve twenty-eight (128) is arranged between the second branch pipe (72) and the water outlet of the reverse osmosis membrane device (60); a fifth conductivity tester is arranged on a pipeline between the twenty-eight valve (128) and the water outlet of the reverse osmosis membrane device (60); a first return pipe (75) is arranged on a pipeline between the twenty-seventh valve (127) and the water outlet of the ultrafiltration membrane device (59); the first return pipe (75) leads to a pipeline between the rear main valve (56) and the rear main pump (57); a twenty-nine valve (129) is arranged on the first return pipe (75); a second return pipe (76) is arranged on a pipeline between the twenty-eight valve (128) and the water outlet of the reverse osmosis membrane device (60); the second return pipe (76) leads to a pipeline between the rear main valve (56) and the rear main pump (57); and a valve thirty (130) is arranged on the second return pipe (76).

5. The double-membrane filtration water purification unit of claim 4, wherein: also comprises an ozone generator (8); the ozone generator (8) is used for disinfecting water flowing into the first water storage tank (61), the second water storage tank (62) and the third water storage tank (63).

6. The double-membrane filtration water purification device according to any one of claims 1 to 5, wherein: the bottom parts of the raw water tank (1), the quartz sand filter (3) and the activated carbon filter (4) are provided with drain ports, and drain valves are arranged on the drain ports; and a liquid level meter is arranged on the raw water tank (1) and is used for monitoring the water quantity in the raw water tank (1).

7. The double-membrane filtration water purification device according to any one of claims 1 to 5, wherein: former water tank (1) delivery port exceeds former water tank (1) bottom certain distance, and is equipped with the filter screen on former water tank (1) delivery port, the cross filter surface slope of filter screen is towards former water tank (1) bottom.