CN104843904A - Water purification equipment, filtering system and water filtering method for filtering system - Google Patents

Abstract

The invention discloses a water purification device, a filtering system and a water filtering method thereof. The filtering system comprises: a pre-filter element connected to an external water source for preliminary water purification; a booster pump connected downstream of the pre-filter element through a water inlet solenoid valve ; The RO membrane filter element group is connected downstream of the booster pump, and the RO membrane filter element has a first water inlet, a first clean water outlet and a first waste water outlet; the flexible water bag has a second water inlet and a second waste water outlet, and the RO membrane filter element The first clean water outlet is connected to the second water inlet of the flexible water bag; the ozone generator is used to sterilize the flexible water bag; the waste water flow path is connected to the second waste water outlet; the rear filter element is connected to the flexible water bag through a water pump to To further purify the water from the flexible water bag, the rear filter element is suitable for connecting with the outlet tap. According to the filtration system of the water purification equipment of the present invention, the flexible water bag can be sterilized by the ozone generator, thereby improving the water quality of drinking water and ensuring the health of drinking water for users.

Description

Water purification equipment, filtration system and water filtration method thereof

technical field

The invention relates to the technical field of water purification equipment, in particular to a filter system of a water purification equipment, a water purification equipment having the same, and a water filtration method.

Background technique

With the vigorous development of the water purification equipment market, more and more water purification equipment have entered thousands of households. At present, the mainstream of water purification equipment is RO reverse osmosis water purifier, and RO reverse osmosis water purifier is divided into large flow and small flow. There are two types. The large flow mainly includes 400 gallons, 500 gallons, 600 gallons, etc. The small flow mainly includes 50 gallons, 75 gallons, 100 gallons and 200 gallons. Consumers need it, but the price is expensive, and it is difficult for ordinary families to accept it. The small flow system usually produces about 0.2-0.5L of water per minute, and it usually takes 1-2 minutes to receive a glass of water. Therefore, traditional small flow systems are usually equipped with 3 to The 5-gallon pressure tank stores water to increase the net water flux at the end and shorten the waiting time for water intake. There are several disadvantages in this way of storing water in the pressure tank and pressurizing the water outlet: First, the water storage tank is too large to completely drain the water Clean, some water will remain every time, resulting in stagnant water quality and easy breeding of bacteria. Second, the pressure tank is relatively large and can only be installed externally, which takes up space and the waterway is complicated.

Contents of the invention

The present invention aims to solve at least one of the technical problems existing in the prior art. For this reason, the present invention proposes a filter system for water purification equipment, which can sterilize the flexible water bag, avoid the growth of bacteria in the flexible water bag for a long time, and improve the water quality of drinking water.

The present invention also proposes a water purification device having the filter system of the above water purification device.

The present invention also proposes a water filtering method for the filtering system of the above-mentioned water purification equipment.

The filtration system of the water purification equipment according to the embodiment of the present invention includes: a pre-filter element, the pre-filter element is connected to an external water source to purify the water quality initially; a booster pump, the booster pump is connected to the water inlet solenoid valve Downstream of the pre-filter element; RO membrane filter element, the RO membrane filter element group is connected downstream of the booster pump, and the RO membrane filter element has a first water inlet, a first clean water outlet and a first waste water outlet; flexible A water bag, the flexible water bag has a second water inlet and a second waste water outlet, the first water outlet of the RO membrane filter element is connected with the second water inlet of the flexible water bag; the ozone generator, the ozone The generator is used to sterilize the flexible water bag; the waste water flow path is connected to the second waste water outlet; the rear filter element is connected to the flexible water bag through a water pump to To further purify the water from the flexible water bag, the post filter element is suitable to be connected with the outlet tap.

According to the filtration system of the water purification equipment of the embodiment of the present invention, the traditional pressure tank is replaced by the flexible water bag, thereby the water storage capacity in the filtration system can be increased, and the space occupied by the flexible water bag in the water purification equipment can be reduced, further The ozone generator can sterilize the flexible water bag, so as to prevent the flexible water bag from breeding bacteria for a long time, further improve the quality of drinking water, and ensure the health of drinking water for users.

According to some embodiments of the present invention, the filter system of the water purification equipment further includes a waste water solenoid valve, and the waste water solenoid valve is arranged on a waste water waterway connected to the waste water outlet. Thus, the wastewater filtered by the RO membrane filter element can be discharged from the wastewater waterway, and the wastewater solenoid valve can control the circulation of the wastewater on the wastewater waterway.

According to some embodiments of the present invention, the flexible water bag is a double-sided flexible water bag. Thus, it can be further ensured that the water in the flexible water bag can be completely discharged.

According to some embodiments of the present invention, a liquid level switch is provided in the flexible water bag, and the liquid level switch includes a high liquid level switch and a low liquid level switch. Thus, the high liquid level switch can detect whether the flexible water bag is full of water, and the low liquid level switch can detect whether the water in the flexible water bag is completely discharged.

Optionally, the high liquid level switch is a micro switch, a reed switch or an infrared pair switch.

According to some embodiments of the present invention, the filter system of the water purification equipment further includes a high-pressure switch connected between the rear filter element and the water outlet tap. Thus, the high pressure switch can control the clean water filtered by the rear filter element to be discharged from the water outlet tap.

Optionally, the high pressure switch is a flow switch or a flow meter. Thereby, the flow of clean water flowing through the high pressure switch can be controlled.

According to some embodiments of the present invention, a waste water drain valve is arranged on the waste water flow path. Thus, the waste water drain valve can control the flow of waste water on the waste water flow path.

According to some embodiments of the present invention, the ozone generator is arranged at the second water inlet of the flexible water bag. Thereby, it is convenient for the ozone generator to sterilize the flexible water bag.

According to some embodiments of the present invention, the pre-filter element is a PAC composite filter element, a PP+Active C composite filter element, or a PP filter element+Active C filter element.

According to some embodiments of the present invention, the post filter element is a C+UF composite filter element.

In addition, the present invention also proposes a water purification device with the filter system of the above-mentioned water purification device. The flexible water bag can increase the water storage capacity of the filter system and reduce the occupied space, and the water pump can completely discharge the water in the flexible water bag. It will be discharged to realize the ready-to-use water, keep the water fresh, avoid secondary pollution, and improve the water quality. The ozone generator can regularly sterilize and disinfect the water in the flexible water bag to avoid long-term use of the flexible water bag. Breeding bacteria can further improve the quality of drinking water and ensure the health of drinking water for users.

In addition, the present invention also proposes a water filtration method, said filtration method comprising the following steps:

S1. Detect whether the water in the flexible water bag is full;

S2. When it is detected in step S1 that the water in the flexible water bag is not full, turn on the water production and repeat step S1;

S3. When it is detected in step S1 that the flexible water bag is full of water, stop water production;

S4, turn on the ozone generator to sterilize the flexible water bag, and the sterilization time is T1;

S5. Turn off the ozone generator, and open the second waste water outlet of the flexible water bag to discharge the water in the flexible water bag;

S6, detecting whether all the water in the flexible water bag is discharged;

S7. In step S7, it is detected that the water in the flexible water bag is not completely discharged, continue to drain, and repeat step S6;

S8. In step S7, it is detected that all the water in the flexible water bag has been discharged, the second waste water outlet is closed, water production is turned on, and water production is stopped after the flexible water bag is detected to be full.

Optionally, during the sterilization process in step S4, the water outlet tap is controlled to stop water outlet.

Optionally, a liquid level switch is provided in the flexible water bag, and the liquid level switch includes a high liquid level switch and a low liquid level switch, and the high liquid level switch is used to detect whether the flexible water bag is full of water, so The low liquid level switch is used to detect whether all the water in the flexible water bag is discharged.

Optionally, the water filtration method further includes: S9. After step S8, calculate time T, and when T is greater than or equal to the predetermined sterilization time T2 and no water is taken, repeat steps S1-S8.

According to the water filtering method of the present invention, the flexible water bag can be regularly sterilized to improve the quality of drinking water for users and ensure the health of drinking water for users.

Description of drawings

The above and/or additional aspects and advantages of the present invention will become apparent and comprehensible from the description of the embodiments in conjunction with the following drawings, wherein:

Fig. 1 is a schematic structural view of a filter system of a water purification device according to an embodiment of the present invention;

Fig. 2 is a schematic flowchart of a water filtration method of a filtration system of a water purification device according to an embodiment of the present invention.

Reference signs:

100: filter system;

1: Pre-filter, 2: Booster pump, 3: Water inlet solenoid valve;

4: RO membrane filter element, 41: first water inlet, 42: first purified water outlet, 43: first wastewater outlet;

5: waste water channel, 51: waste water solenoid valve;

6: flexible water bag, 61: liquid level switch, 611: high liquid level switch, 612: low liquid level switch, 62: second water inlet, 63: second waste water outlet;

7: Rear filter element;

8: High voltage switch;

9: water pump;

10: Ozone generator;

11: waste water flow path, 111: waste water drain valve.

Detailed ways

Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals designate the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary only for explaining the present invention and should not be construed as limiting the present invention.

In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description. It is not intended to indicate or imply that the referred device or element must have a particular orientation, be constructed in a particular orientation, and operate in a particular orientation, and thus should not be construed as limiting the invention. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be interpreted as indicating or implying relative importance or implicitly specifying the quantity of indicated technical features. Thus, a feature defined as "first" and "second" may explicitly or implicitly include one or more of these features. In the description of the present invention, unless otherwise specified, "plurality" means two or more.

In the description of the present invention, it should be noted that unless otherwise specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection. Connected, or integrally connected; it can be mechanically connected or electrically connected; it can be directly connected or indirectly connected through an intermediary, and it can be the internal communication of two components. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present invention in specific situations.

The following describes a filter system 100 of a water purification device according to an embodiment of the present invention with reference to FIG. 1 .

As shown in Figure 1, the filter system 100 of the water purification equipment according to the embodiment of the present invention may include a pre-filter 1, a booster pump 2, an RO membrane filter 4, a flexible water bag 6, a waste water flow path 11, and an ozone generator 10 and post filter element 7. In Figure 1, the solid line arrows point to the flow direction of clean water, and the dotted line arrows point to the waste water flow direction.

As shown in Figure 1, the pre-filter element 1 is connected to the external water source, and the tap water from the external water source can be preliminarily purified through the pre-filter element 1. The pre-filter element 1 can intercept rust, sediment and other particulate matter to remove residual chlorine in the tap water and organic impurities.

The booster pump 2 is connected downstream of the pre-filter 1, between the pre-filter 1 and the RO membrane filter 4, connected to the power supply, provides water pressure for the filtration system 100, and draws tap water from an external water source so that the tap water passes through the pre-filter 1 , the tap water flows to the RO membrane filter element 4 after being filtered by the pre-filter element 1, and the booster pump 2 can provide thrust for the water outlet of the flexible water bag 6, so that the water in the flexible water bag 6 is completely discharged. A water inlet solenoid valve 3 is connected between the booster pump 2 and the pre-filter element 1 , and the water inlet solenoid valve 3 responds sensitively, so that the on-off of the water between the pre-filter element 1 and the booster pump 2 can be effectively controlled.

The RO membrane filter element 4 is connected downstream of the booster pump 2, and the RO membrane filter element 4 has a first water inlet 41, a first clean water outlet 42 and a first waste water outlet 43, specifically, the first water inlet 41 and the booster pump 2 The first clean water outlet 42 is connected with the flexible water bag 6, so that the water drawn by the booster pump 2 flows into the RO membrane filter element 4 from the first water inlet 41, and after being filtered by the RO membrane filter element 4, the purified water flows from the first clean water bag The water outlet 42 flows out, and the waste water is discharged from the first waste water outlet 43 .

The flexible water bag 6 is located at the downstream of the RO membrane filter element 4, the flexible water bag 6 has a second water inlet 62 and a second waste water outlet 63, and the second water inlet 62 is connected with the first water purification outlet 42, so that the RO membrane filter element 4 The filtered clean water flows into the flexible water bag 6 from the second water inlet 62, and can be stored in the flexible water bag 6. The water storage capacity of the flexible water bag 6 is relatively large and the volume is small, so that the water purification equipment can be enlarged. The water storage capacity reduces the occupied space of the flexible water bag 6.

As shown in Figure 1, the second wastewater outlet 63 of the flexible water bag 6 is connected to the waste water flow path 11, and the ozone generator 10 can sterilize the flexible water bag 6, so that the flexible water bag 6 is sterilized at the ozone generator 10 After disinfection, the waste water in the flexible water bag 6 can be discharged from the waste water flow path 11. After the water in the flexible water bag 6 is completely discharged, the filter system 100 starts to produce water for the user to drink, thereby avoiding the long-term dehydration of the flexible water bag 6. There is no need to breed bacteria to ensure the health of drinking water for users. Optionally, the ozone generator 10 can be arranged at the second water inlet 62 of the flexible water bag 6, so that the ozone generator 10 can sterilize the flexible water bag 6, and the ozone generator 10 can remove the peculiar smell in the water simultaneously, so as to Improve the quality of drinking water.

The rear filter element 7 is connected to the downstream of the flexible water bag 6, and the flexible water bag 6 is connected to the flexible water bag 6 through a water pump 9 to further purify the water from the flexible water bag 6. Out), so that the water pump 9 can absorb the water in the flexible water bag 6 and completely discharge the water in the flexible water bag 6, and then filter through the rear filter element 7, and the water filtered again can flow out from the outlet tap for the user to drink. In this way, the pure water can be produced and used immediately, the water quality can be kept fresh, and secondary pollution can be avoided.

Thus, the tap water from the external water source is preliminarily purified through the pre-filter 1, the booster pump 2 is connected to the power supply, the water inlet solenoid valve 33 is opened, the booster pump 2 draws the preliminary purified water to the RO membrane filter element 4, and the RO membrane filter element 4 After secondary purification of the water, the water purified by the 4 groups of RO membrane filter elements flows to the flexible water bag 6 and is stored in the flexible water bag 6 , where the ozone generator 10 can sterilize the flexible water bag 6 . When the user needs to drink water, the water outlet tap is opened, and the water in the flexible water bag 6 is extracted by the water pump 9 after being purified again by the rear filter element 7, and then discharged from the outlet tap. When the user does not take water for a long time, the ozone generator 10 sterilizes the flexible water bag 6 to avoid breeding bacteria.

According to the filtration system 100 of the water purification equipment of the embodiment of the present invention, by replacing the transmission pressure tank with the flexible water bag 6, the water storage capacity in the filtration system 100 can be increased, and the occupancy of the flexible water bag 6 in the water purification equipment can be reduced Furthermore, the ozone generator 10 can sterilize the flexible water bag 6, so as to prevent the flexible water bag 6 from breeding bacteria for a long time, further improve the water quality of drinking water, and ensure the health of drinking water for users.

As shown in Figure 1, the filtration system 100 of the water purification equipment also includes a waste water solenoid valve 51, the waste water solenoid valve 51 is arranged on the waste water waterway 5, and the waste water waterway 5 is connected with the first waste water outlet 43, thus, the RO membrane filter element 4 filters The final waste water is discharged from the waste water channel 5, and the waste water electromagnetic valve 51 can control the circulation of the waste water on the waste water channel 5, and the waste water electromagnetic valve 51 is responsive, thereby effectively controlling the discharge of the waste water on the waste water channel 5.

In some embodiments of the present invention, the flexible water bag 6 can be a double-sided flexible water bag, and the thrust of the booster pump 2 impels the clean water of the RO membrane filter element 4 to be stored in the double-sided flexible water bag, and the double-sided flexible water bag is extracted by the water pump 9. When purifying the water in the flexible water bag, it can further ensure that the water in the flexible water bag 6 is completely discharged, thereby ensuring that the purified water quality of the flexible water bag 6 is more fresh.

As shown in Figure 1, a liquid level switch 61 can be arranged in the flexible water bag 6, and the liquid level switch 61 can include a high liquid level switch 611 and a low liquid level switch 612, in the example shown in Figure 1, the high liquid level switch 611 can be set at the position of the high liquid level in the flexible water bag 6 to detect whether the flexible water bag 6 is full of water, and the low liquid level switch 612 can be set at the low liquid level of the flexible water bag 6 to detect whether the flexible water bag 6 is full of water. 6. Whether the water in 6 is drained cleanly.

For the high liquid level switch 611, in some examples of the present invention, the high liquid level switch 611 can be a micro switch, and the micro switch is sensitive, which can improve the sensitivity of the filter system 100 control; in other examples of the present invention Among them, the high liquid level switch 611 can be a dry reed switch, and the dry reed switch is small in size and can be installed in a limited space, thereby reducing the occupied space of the high liquid level switch 611; or the high liquid level switch 611 can also be an infrared right tube. It can be understood that the high liquid level switch 611 can be in various other forms.

As shown in Figure 1, the filter system 100 of the water purification equipment can also include a high-voltage switch 8, which is connected between the rear filter element 7 and the water outlet faucet to cut off the power supply at high voltage and stop water production. For the high-pressure switch 8, the high-pressure switch 8 can be a flow switch or a flowmeter, so that the flow of clean water passing through the high-pressure switch 8 can be adjusted by the flow switch or the flowmeter to control the water outlet speed of the faucet.

As an optional implementation, a waste water drain valve 111 may be provided on the waste water flow path 11 , and the waste water drain valve 111 is used to control the flow of waste water on the waste water flow path 11 .

Optionally, the pre-filter element 1 can be a PAC composite filter element, a PP+active C composite filter element or a PP filter element+active C filter element. In some examples of the present invention, the pre-filter element 1 can be a PAC composite filter element, and the PAC composite filter element includes a three-layer composite of non-woven fabric, carbon fiber and PP cotton, thus, when the PAC composite filter element needs to be replaced, the installation of the PAC composite filter element The box can be free of cleaning, so that the practicability of the filter system 100 of the water purification equipment can be improved to a certain extent. In some other examples of the present invention, the pre-filter element 1 may be a PP+activated C composite filter element or a PP filter element+activated C filter element to perform preliminary purification of water from an external water source.

Optionally, the rear filter element 7 may be a C+UF composite filter element, that is, an activated carbon ultrafiltration composite filter element. The activated carbon filter element can absorb residual chlorine, peculiar smell and color, organic pollutants, etc. in the water. Minerals, trace elements, etc. ensure the quality of water. Therefore, the C+UF composite filter element can further absorb the color and odor substances in the water, and at the same time adjust the taste of the water and improve the quality of the water. Alternatively, the rear filter element 7 can also be an activated carbon filter element or a UF filter element. It can be understood that the post-filter element 7 can also be in other forms.

In addition, the present invention also proposes a water purification device with the filter system 100 of the above-mentioned water purification device. The flexible water bag 6 can increase the water storage capacity of the filter system 100 and reduce the occupied space, and the water pump 9 can move the flexible water bag The water in 6 will be discharged completely, realize the ready-to-use water, keep the freshness of water, avoid secondary pollution, improve the quality of water, the ozone generator 10 can regularly sterilize and disinfect the water in the flexible water bag 6, Avoid the growth of bacteria caused by the flexible water bag 6 not being used for a long time, thereby further improving the water quality of drinking water and ensuring the health of drinking water for users.

In addition, the invention also proposes a water filtering method for the filtering system of the water purification equipment.

The water filtering method of the filtering system 100 of the water purification equipment according to the embodiment of the present invention will be described in detail below with reference to FIG. 1 and FIG. 2 . Wherein, during the normal use of the water purification equipment, the ozone generator 10 can be opened regularly to sterilize the flexible water bag 6. Bag 6 is sterilized.

Specifically, firstly, the water purification equipment can detect whether the flexible water bag 6 is full of water, if the water is not full, then start water production, open the water inlet solenoid valve 3 and the booster pump 2, and the purified water filtered by the RO membrane filter element 4 flows to the flexible water Bag 6 is also stored in the flexible water bag 6, if it is detected that the flexible water bag 6 is full of water, the water inlet solenoid valve 3 and the booster pump 2 are closed; after the flexible water bag 6 is full of water, the ozone generator 10 is opened to start The flexible water bag 6 is sterilized, and when the sterilization time reaches T1, the ozone generator 10 is closed, and the sterilization is stopped. After the sterilization is finished, the waste water drain valve 111 is opened, and the waste water in the flexible water bag 6 is discharged from the waste water flow path 11. When the water in the flexible water bag 6 is completely discharged, the second waste water outlet 43 is closed, and the water purification equipment starts to produce water until it detects that the flexible water bag 6 is full of water, and stops water production.

Further, after the water production is stopped, the water purifying equipment starts to calculate the time T, and when T is greater than or equal to the predetermined sterilization time T2 and still does not take water, it starts to sterilize the flexible water bag 6 again, that is to say, if the user does not take it for a long time When using water, the water purification equipment calculates that when the interval time T between two water intakes is greater than or equal to the predetermined sterilization time T2, that is, when the water in the flexible water bag 6 does not flow is greater than or equal to the predetermined sterilization time T2 of the ozone generator 10, the water purification equipment can control The ozone generator 10 is opened to sterilize the flexible water bag 6 .

During the sterilizing process of the ozone generator 10, the water pump 9 is closed, and the water purifier can display that it is sterilizing, and controls the water outlet to stop the water discharge.

As an optional embodiment, a liquid level switch 61 is arranged in the flexible water bag 6, and the liquid level switch 61 may include a high liquid level switch 611 and a low liquid level switch 612, wherein the high liquid level switch 611 is used to detect 6 is filled with water, the low liquid level switch 612 is used to detect whether the water in the flexible water bag 6 is all discharged. The high liquid level switch 611 and the low liquid level switch 612 are connected with the control board of the water purification equipment. The control board can control whether the filtration system 100 starts to produce water according to the information fed back by the high liquid level switch 611. According to the information fed back by the low liquid level switch 612 The flow of the wastewater flow path 11 is controlled.

In the description of this specification, references to the terms "one embodiment," "some embodiments," "exemplary embodiments," "example," "specific examples," or "some examples" are intended to mean that the implementation A specific feature, structure, material, or characteristic described by an embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

Although the embodiments of the present invention have been shown and described, those skilled in the art can understand that various changes, modifications, substitutions and modifications can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the invention is defined by the claims and their equivalents.

Claims (16)

1. a filtering system for water purifying plant, is characterized in that, comprising:

Preposition filter core, described preposition filter core is connected with external water source with rough purification water quality;

Topping-up pump, described topping-up pump is connected to the downstream of described preposition filter core by entering water electromagnetic valve;

RO membrane cartridge, described RO membrane cartridge group is connected to the downstream of described topping-up pump, and described RO membrane cartridge has the first water-in, the first pure water inlet and the first wastewater outlet;

Flexible water bag, described flexible water bag has the second water-in and the second wastewater outlet, and the first pure water inlet of described RO membrane cartridge is connected with the second water-in of described flexible water bag;

Ozonizer, described ozonizer is used for carrying out sterilization and disinfection to described flexible water bag;

Waste water stream, described waste water stream is connected with described second wastewater outlet;

Rearmounted filter core, described rearmounted filter core is connected to purify the water from described flexible water bag further with described flexible water bag by water pump, and described rearmounted filter core is suitable for being connected with depotition cock.

2. the filtering system of water purifying plant according to claim 1, is characterized in that, comprises Wastewater by Electric magnet valve further, and described Wastewater by Electric magnet valve is located on the waste water water route that is connected with described wastewater outlet.

3. the filtering system of water purifying plant according to claim 1, is characterized in that, described flexible water bag is double-faced flexible water bag.

4. the filtering system of water purifying plant according to claim 1, is characterized in that, arranges liquid level switch in described flexible water bag, and described liquid level switch comprises high level switch and low liquid level switch.

5. the filtering system of water purifying plant according to claim 4, is characterized in that, described high level switch is vernier switch, dry-reed tube or infrared tube.

6. the filtering system of water purifying plant according to claim 1, is characterized in that, comprises high-voltage switch gear further, and described high-voltage switch gear is connected between described rearmounted filter core and described depotition cock.

7. the filtering system of water purifying plant according to claim 6, is characterized in that, described high-voltage switch gear is flow valve or under meter.

8. the filtering system of water purifying plant according to claim 1, is characterized in that, described waste water stream is provided with waste water water discharge valve.

9. the filtering system of water purifying plant according to claim 1, is characterized in that, described ozonizer is located at the second water inlet of described flexible water bag.

10. according to the filtering system of the water purifying plant described in claim 1, it is characterized in that, described preposition filter core is PAC composite filter element, the active C composite filter element of PP+ or PP filter core+active C filter core.

11. according to the filtering system of the water purifying plant described in claim 1, and it is characterized in that, described rearmounted filter core is C+UF composite filter element.

12. 1 kinds of water purifying plants, is characterized in that, comprise the filtering system of the water purifying plant according to any one of claim 1-11.

The water filtration method of the filtering system of 13. 1 kinds of water purifying plants according to claim 1, is characterized in that, comprises the following steps:

S1, to detect in described flexible water bag whether water is full;

To detect in S2, step S1 in described flexible water bag water less than time, open water processed, and repeating step S1;

When detecting in S3, step S1 that described flexible water bag water is full, stop water processed;

S4, unlatching ozonizer carry out sterilization to described flexible water bag, and sterilizing time is T1;

S5, closedown ozonizer, open described second wastewater outlet of described flexible water bag to discharge the water in described flexible water bag;

Whether S6, the water detected in described flexible water bag all discharge;

Detect in S7, step S7 that in described flexible water bag, water is not all discharged, continue draining, and repeating step S6;

Detect in S8, step S7 that in described flexible water bag, water is all discharged, close described second wastewater outlet, open water processed, detect described flexible water bag water and stop water processed completely afterwards.

14. water filtration methods according to claim 13, is characterized in that, in the sterilization process of step S4, control described depotition cock and stop water outlet.

15. water filtration methods according to claim 13, it is characterized in that, in described flexible water bag, liquid level switch is set, described liquid level switch comprises high level switch and low liquid level switch, whether water is full for detecting described flexible water bag for described high level switch, and whether described low liquid level switch all discharges for the water detected in described flexible water bag.

16. water filtration methods according to claim 13, is characterized in that, further comprising the steps of:

After S9, step S8, computing time, T, fetched water not yet when T is more than or equal to predetermined sterilizing time T2, then repeating step S1-S8.