CN204625366U - Water purification equipment - Google Patents

Abstract

The utility model discloses a water purification device, which comprises: a raw water inlet, a filter assembly, a pressure reducing valve, a source water pump and a low pressure switch. The filter assembly is connected to the raw water inlet through the raw water inlet pipe. The filter assembly is used to receive and filter the raw water; the pressure reducing valve is connected to the raw water inlet pipe in series to reduce the The water pressure of the raw water inlet pipe; the source water pump is connected in series to the raw water inlet pipe to increase the fluid pressure; the low pressure switch is set on the raw water inlet pipe to detect the water pressure of the raw water inlet pipe, so as to detect the low water pressure of the raw water inlet pipe When the range value is set, the control source water pump is turned on. According to the water purification equipment of the utility model, the excessively high water inlet pressure is reduced through the pressure reducing valve and the linkage action of the source water pump and the low pressure switch is used to increase the too low water inlet pressure, so that the water inlet pressure is stabilized within the working range of the water purification equipment Within, to ensure the stable operation of water purification equipment.

Description

Water purification equipment

technical field

The utility model relates to the field of water treatment equipment, in particular to a water purification equipment.

Background technique

At present, the water pressure of tap water in our country is unstable. When the water pressure is low, it is lower than 0.1MPa, which cannot guarantee the water flow rate and the total amount of purified water of the water purification equipment; when the water pressure is high, it can reach 0.7MPa, or even 1.0MPa. It is easy to bring a great risk of water leakage to the water purification equipment.

Utility model content

The utility model aims to solve one of the technical problems in the related art at least to a certain extent. For this reason, the utility model proposes a water purification device, which ensures the stable operation of the water purification device by controlling the water inlet pressure and making it stable within the working range.

According to the water purification equipment of the present invention, it comprises: a raw water inlet; a filter assembly, the filter assembly is connected to the raw water inlet through a raw water inlet pipe, and the filter assembly is used to receive and filter the raw water; a pressure reducing valve, The pressure reducing valve is connected in series on the raw water inlet pipe to reduce the hydraulic pressure of the raw water inlet pipe when it is detected that the water pressure of the raw water inlet pipe is greater than the set range value; the source water pump used to increase the fluid pressure , the source water pump is connected in series on the raw water inlet pipe; a low pressure switch, the low pressure switch is set on the raw water inlet pipe to detect the water pressure of the raw water inlet pipe, so as to detect the water pressure of the raw water inlet pipe When the water pressure is lower than the set range value, the source water pump is controlled to be turned on.

According to the water purification equipment of the present utility model, the excessively high water inlet pressure is reduced through the pressure reducing valve, and the too low water inlet pressure is increased through the linkage action of the source water pump and the low pressure switch, so that the water inlet pressure is stabilized at the level of the water purification equipment. Within the scope of work, ensure the stable operation of the water purification equipment.

According to the water purification equipment of the present utility model, it also includes a first one-way valve, the first one-way valve is connected in series on the raw water inlet pipe, and the first one-way valve is connected from the raw water inlet to the filter unidirectional conduction in the direction of the component. Specifically, the first check valve and the source water pump are connected in parallel.

According to an embodiment of the present utility model, the filter assembly includes: a pre-filter element, the pre-filter element is connected to the raw water inlet pipe; a membrane filter element, the membrane filter element is connected to the outlet of the pre-filter element, The membrane filter element has a pure water port and a concentrated water port, the pure water port is connected to a pure water pipe, the concentrated water port is connected to a concentrated water pipe, and a wastewater regulating valve is connected in series on the concentrated water pipe.

According to an embodiment of the present invention, the pre-filter element includes multiple sets of filter element groups connected in series, and each set of filter element groups includes a plurality of first filter elements connected in parallel.

According to an embodiment of the present invention, the filter element sets are divided into two groups, and each filter element set includes two first filter elements.

According to an embodiment of the present invention, the pre-filter element further includes a second filter element, and the second filter element is connected in series between the most downstream filter element group and the membrane filter element.

According to an embodiment of the present invention, a booster pump is connected in series between the pre-filter element and the membrane filter element, and the booster pump is used to increase fluid pressure.

According to an embodiment of the utility model, the water purification equipment further includes a waste water recovery pipe, one end of the waste water recovery pipe is connected between the waste water regulating valve and the concentrated water port, and the other end of the waste water recovery pipe is connected to between the booster pump and the pre-filter element.

Further, a second one-way valve is connected in series on the waste water recovery pipe, and the second one-way valve conducts in one direction in the direction from one end of the waste water recovery pipe to the other end of the waste water recovery pipe.

Description of drawings

Fig. 1 is a schematic diagram of a waterway flow of a water purification device according to an embodiment of the present invention.

Reference signs: water purification equipment 100, pressure reducing valve 1, low pressure switch 2, source water pump 3, first one-way valve 4, filter assembly 5, pre-filter element 51, first filter element 511, second filter element 512, membrane filtration Filter element 52, water inlet solenoid valve 6, pressure gauge 7 before the pump, booster pump 8, high pressure switch 9, pressure gauge 10 after the pump, concentrated water pressure gauge 11, second one-way valve 12, concentrated water flow meter 13, flushing Solenoid valve 14, wastewater regulating valve 15, pure water conductivity probe 16, pure water flow meter 17, pressure switch 18, pressure tank 19, rear filter element 20, raw water inlet A, concentrated water port B, pure water port C, concentrated Water outlet E, pure water outlet F, raw water inlet pipe a, concentrated water pipe b, pure water pipe c, waste water recovery pipe d.

Detailed ways

Embodiments of the invention are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below by referring to the figures are exemplary and are intended to explain the present invention, but should not be construed as limiting the present invention.

In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the term "upper" is based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the utility model and simplifying the description, rather than Any indication or implication that a referenced device or element must have a particular orientation, be constructed, and operate in a particular orientation 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, the features defined as "first" and "second" may explicitly or implicitly include at least one of these features. In the description of the present utility model, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

In the present utility model, unless otherwise clearly specified and limited, terms such as "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral body; it can be A mechanical connection may also be an electrical connection or be communicable with each other; it may be a direct connection or an indirect connection through an intermediary, and it may be an internal communication between two elements or an interaction relationship between two elements, unless otherwise clearly defined. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present utility model according to specific situations.

In the present invention, unless otherwise specified and limited, a first feature "on" a second feature may be in direct contact with the first feature, or indirect contact with the first feature through an intermediary.

The water purification device 100 according to the present utility model will be described in detail below with reference to FIG. 1 .

The water purification device 100 according to the embodiment of the present invention has a raw water inlet A, and the water purification device 100 includes a filter assembly 5 , a pressure reducing valve 1 , a source water pump 3 and a low pressure switch 2 . Wherein, the raw water inlet A is connected to the water source; the filter assembly 5 is connected to the raw water inlet A through the raw water inlet pipe a, and is used for receiving and filtering the raw water from the water source.

The pressure reducing valve 1 is connected in series on the raw water inlet pipe a to reduce the water pressure of the raw water inlet pipe a when it is detected that the water pressure of the raw water inlet pipe a is greater than the set range value. That is to say, when the pressure of the raw water flowing from the raw water inlet A into the raw water inlet pipe a is too high (higher than the critical value set by the pressure reducing valve 1), the pressure reducing valve 1 will automatically adjust the water pressure and reduce the water pressure , so that the water pressure is reduced to within the working range of the water purification equipment 100, which can avoid the huge impact and damage to the filter assembly 5 caused by the high water pressure, and also avoid the water purification caused by the extremely high water pressure. The risk of water leakage of the equipment 100 is ensured to ensure the stable operation of the water purification equipment 100. Optionally, the decompression valve 1 may be a pressure stabilizing valve, but is not limited to the type of the above decompression valve 1, as long as it can reduce the pressure of the fluid and reduce the fluid pressure to the value within the working range.

The source water pump 3 is connected in series on the raw water inlet pipe a to increase the fluid (water flow) pressure; the low pressure switch 2 is set on the raw water inlet pipe a to detect the water pressure of the raw water inlet pipe a, so as to detect the water pressure of the raw water inlet pipe a. When the pressure is lower than the set range value, the control source water pump 3 is turned on. That is to say, when the water pressure of the raw water flowing into the raw water inlet pipe a from the raw water inlet A is too low (lower than the critical value set by the low pressure switch 2), the low pressure switch 2 controls the source water pump 3 to open, and the source water pump 3 The optional matching ensures that the source water pump 3 pressurizes the low-pressure water flow to within the working range of the water purification equipment 100, so that when the water pressure is too low, the water intake and the total amount of purified water of the water purification equipment 100 are too small and cannot The requirement of drinking water quantity is met, so as to ensure that the water purification device 100 can continuously and stably provide the required purified water quantity. Optionally, the low-pressure switch 2 can be a pressure controller or a pressure sensor, but not limited to the types of the above-mentioned pressure control devices; the source water pump 3 can be a supercharger, but not limited thereto, as long as it can play the role of boosting and will It is sufficient to reduce the fluid pressure to within the working range value.

It should be noted here that the structures and working principles of the above-mentioned pressure reducing valve 1 , source water pump 3 and low pressure switch 2 are all prior art, and will not be described in detail here.

According to the water purification equipment 100 of the embodiment of the utility model, on the one hand, the excessively high inlet water pressure is reduced through the pressure reducing valve 1, and the water pressure is reduced to within the working range of the water purification equipment 100; on the other hand, the source water pump 3 The linkage effect with the low-pressure switch 2 increases the water inlet water pressure that is too low, and increases the water pressure to within the working range of the water purification equipment 100, thereby stabilizing the water inlet water pressure within the working range of the water purification equipment 100, and avoiding the occurrence of net water pressure. There is a risk of water leakage in the water equipment 100, and the stable operation of the water purification equipment 100 is ensured, so that it can continuously and stably provide the required amount of purified water.

According to an embodiment of the present utility model, as shown in Figure 1, the water purification equipment 100 can also include a first one-way valve 4, the first one-way valve 4 is connected in series on the raw water inlet pipe a, and the first one-way valve 4 is in the The direction from the raw water inlet A to the filter assembly 5 is unidirectional, and the first one-way valve 4 and the source water pump 3 are connected in parallel. When the inlet water pressure is higher than the critical value set by the low pressure switch 2, that is to say, when the inlet water pressure is within the normal working pressure range of the water purification equipment 100 or higher than the critical value set by the pressure reducing valve 1, the source water pump 3 is turned off The raw water entering the raw water inlet pipe a flows through the first one-way valve 4 and then flows into the filter assembly 5; when the inlet water pressure is lower than the critical value set by the low pressure switch 2, the source water pump 3 is turned on, and due to the pressure difference, the water entering The raw water in the raw water inlet pipe a mainly flows into the source water pump 3 for pressurization, and the pressurized water flows directly into the filter assembly 5 . Therefore, the function of the first one-way valve 4 is to prevent excessive water pressure from impacting the filter assembly 5 and causing damage to the filter assembly 5 when the pressure reducing valve 1 cannot meet the working requirements, while avoiding excessive water pressure from causing damage to the filter assembly 5. The risk of water leakage brought by the water equipment 100.

According to an embodiment of the present invention, as shown in FIG. 1 , specifically, the filter assembly 5 includes a pre-filter element 51 and a membrane filter element 52 . Wherein, the inlet of the pre-filter element 51 is connected with the raw water inlet pipe a, the inlet of the membrane filter element 52 is connected with the outlet of the pre-filter element 51, and the membrane filter element 52 has a pure water port C and a concentrated water port B, namely the membrane filter element 52. The outlet is divided into two outlets: pure water port C and concentrated water port B. Pure water port C is connected to pure water pipe c, and concentrated water port B is connected to concentrated water pipe b. Optionally, a pure water conductivity probe 16 may be provided on the pure water pipe c for detecting the conductivity of pure water; a concentrated water conductivity probe (not shown) may be provided on the concentrated water pipe b, Used to detect the conductivity of concentrated water.

That is to say, the raw water flowing in from the raw water inlet A flows through the raw water inlet pipe a, and is decompressed by the pressure reducing valve 1 on the raw water inlet pipe a or the source water pump 3 and the low pressure switch 2 are jointly boosted, and then flows through the filter in sequence. The pre-filter element 51 and the membrane filter element 52 in the module 5 perform primary filtration and deep-level filtration respectively, and the water flowing out from the membrane filter element 52 is divided into two parts: one part flows out from the pure water port C and flows into the pure water pipe c; the other Part of it flows out from the concentrated water port B and flows into the concentrated water pipe b. Optionally, the membrane filter element 52 is an RO membrane (reverse osmosis membrane) filter element, a nanofiltration membrane filter element or an ultrafiltration membrane filter element, but is not limited to the types of the above filter elements.

Further, a wastewater regulating valve 15 is connected in series on the concentrated water pipe b, and the wastewater regulating valve 15 is used to adjust the discharge ratio of the concentrated water to balance the system pressure of the water purification equipment 100 and ensure the continuous and stable operation of the water purification equipment 100 .

In some optional embodiments of the present invention, the pre-filter element 51 includes multiple filter element groups connected in series, and each filter element group includes a plurality of first filter elements 511 connected in parallel. The water purification flow rate of the pre-filter element 51 can be increased by adopting the above-mentioned connection mode in which the plurality of first filter elements 511 are connected in parallel and then connected in series.

Specifically, the above-mentioned pre-filter element 51 is composed of multiple sets of filter element groups connected in series, and each set of filter element groups includes a plurality of first filter elements 511 connected in parallel. Since each set of parallel first filter elements 511 is the same, on the one hand, It can ensure that the life of the same filter element is roughly the same, so that the stability of the life cycle of the filter element can be guaranteed, and the filter element can be replaced in time; on the other hand, the filtering capacity of the same filter element is roughly the same, so that the filter element can be fully and effectively used The unique filtering function increases the flow rate and the amount of purified water passing through the filter element, and at the same time makes the flux of purified water more stable.

The pre-filter element 51 can also include a second filter element 512, and the second filter element 512 is connected in series between the most downstream filter element group and the membrane filter element 52, for new impurities that may be produced in the first filter element 511 (such as in activated carbon) Charcoal powder) is filtered out, mainly plays the effect of double protective membrane filter element 52, preferably, the second filter element 512 is PP cotton.

According to a specific example of the present invention, as shown in FIG. 1 , there are two sets of filter elements, such as a first set of filter elements and a second set of filter elements, and each set of filter elements includes two parallel first filter elements 511 . Preferably, the first filter element 511 of the first group of filter elements located upstream is PP cotton; optionally, the first filter element 511 of the second group of filter elements located downstream is activated carbon, an ultrafiltration membrane filter element or a softening resin filter element, but It is not limited to the types of the above-mentioned filter elements.

According to one embodiment of the present utility model, as shown in Figure 1, a booster pump 8 is also provided between the pre-filter element 51 and the membrane filter element 52, and the booster pump 8 is connected in series between the pre-filter element 51 and the membrane filter element 52 Between, that is, the booster pump 8 is connected to the outlet of the pre-filter element 51 and the inlet of the membrane filter element 52 respectively, and the booster pump 8 is used to increase the pressure of the fluid (water flow) to ensure that the water flow can pass through the membrane filter element 52 smoothly. , to establish the working pressure of the water purification system to achieve the purpose of water purification. Optionally, the booster pump 8 is a high-pressure pump.

What needs to be explained here is that the structure and working principle of the above-mentioned wastewater regulating valve 15, concentrated water conductivity probe (not shown), pure water conductivity probe 16 and booster pump 8 are all prior art, No more detailed description here.

According to an embodiment of the present invention, as shown in FIG. 1 , optionally, the water purification equipment 100 may also be provided with a waste water recovery system formed by a waste water recovery pipe d and a waste water regulating valve 15 . One end of the waste water recovery pipe d is connected between the waste water regulating valve 15 and the concentrated water port B, and the other end of the waste water recovery pipe d is connected between the booster pump 8 and the pre-filter 51 . Thus, part of the concentrated water flowing out from the concentrated water port B through the concentrated water pipe b is discharged through the waste water regulating valve 15 and the concentrated water outlet E, and the other part flows into the pressurized water through one end of the waste water recovery pipe d and the other end of the waste water recovery pipe d. The connecting pipe between the pump 8 and the pre-filter 51 (i.e. the water inlet line of the booster pump 8) is mixed with the water flowing out of the pre-filter 51, and then enters the booster pump 8 for recycling, so that the waste water recovery pipe d can It is used to recycle part of the concentrated water, increase the recycling value of the concentrated water, and save water resources.

Further, a second one-way valve 12 can be connected in series on the waste water recovery pipe d, and the second one-way valve 12 is unidirectionally conducted in the direction from one end of the waste water recovery pipe d to the other end of the waste water recovery pipe d, thereby preventing waste water The concentrated water in the recovery pipe d is returned to the concentrated water pipe b.

According to a specific embodiment of the present utility model, as shown in Fig. 1, assuming that the working pressure range value of the water purification equipment 100 is 0.25MPa-0.4MPa, the critical value set by the pressure reducing valve 1 is 0.4MPa, and the low pressure The critical value set by switch 2 is 0.25MPa. The raw water flows into the raw water inlet pipe a through the raw water inlet A. When the water pressure in the raw water inlet pipe a is higher than 0.4MPa, it is higher than the critical value set by the pressure reducing valve 1. When the water pressure is 0.4MPa, the pressure reducing valve 1 will automatically reduce the water pressure so that the water inlet pressure is less than 0.4MPa. At this time, the source water pump 3 is in the closed state, and the decompressed water flows into the pre-filter element 51 through the first one-way valve 4; When the water pressure in the raw water inlet pipe a is lower than 0.25MPa, that is, when it is lower than the critical value 0.25MPa set by the low-pressure switch 2, the low-pressure switch 2 controls the source water pump 3 to turn on, and the turned-on source water pump 3 increases the water pressure to make the inlet The water pressure is higher than 0.25MPa, and the inlet water pressure after pressurization is always less than 0.4MPa by selecting a suitable source water pump 3 . That is to say, the excessively high water pressure can be reduced through the pressure reducing valve 1 or the excessively low water pressure can be increased through the joint action of the source water pump 3 and the low pressure switch 2, so that no matter whether the inlet water pressure is too high or too low, the inlet water pressure can be reduced. The water pressure is stable within the range of 0.25MPa–0.4MPa.

When the water pressure of the raw water inlet pipe a is in the range of 0.25MPa-0.4MPa, that is, when it is just within the working range of the water purification equipment 100, since the inlet water pressure is higher than the critical value of 0.25MPa set by the low pressure switch 2, At this time, the source water pump 3 is closed, so the water flowing from the raw water inlet A into the raw water inlet pipe a flows through the pressure reducing valve 1 and the first one-way valve 4 in sequence, and then flows into the pre-filter 51, while the inlet water pressure is simultaneously It is lower than the critical value 0.4MPa set by the pressure reducing valve 1, and the pressure reducing valve 1 will not decompress the inlet water pressure, so the inlet water pressure is still stable within the range of 0.25MPa–0.4MPa.

After the water pressure of the raw water inlet pipe a is controlled and stabilized within the range of 0.25MPa-0.4MPa, it flows through the two first filter elements 511 of the first filter element group in the pre-filter element 51 and the two filter elements of the second filter element group in sequence. The two first filter elements 511 and the second filter element 512 perform primary filtration, and then the water flow is boosted by the booster pump 8 and flows into the membrane filter element 52 for deep filtration. The water filtered by the membrane filter element 52 is divided into two parts: one part It flows out from the concentrated water port B and flows into the concentrated water pipe b; the other part flows out from the pure water port C and flows into the pure water pipe c.

Further, the concentrated water in the concentrated water pipe b is divided into two flow paths: one path is directly discharged through the waste water regulating valve 15; the other path enters the water inlet line of the booster pump 8 through the waste water recovery pipe d, and is connected with the pre-filter element The water flowing out of 51 is combined, and through the boosting action of the booster pump 8, it flows into the membrane filter element 52 for deep-level filtration, so that part of the concentrated water is purified and recycled. During the operation of the above-mentioned water purification equipment 100, on the one hand, by controlling the water supply pressure and water supply flow rate of the booster pump 8, the water inlet pressure and water flow rate of the membrane filter element 52 can reach a basically stable state; The valve 15 adjusts the flow rate of the directly discharged concentrated water to a stable state, so that the flow rate of part of the concentrated water flowing into the waste water recovery pipe d is controlled and reaches a stable state, and then the entire water purification system reaches a stable state, ensuring that the water purification system The stability of water quality saves water resources.

The pure water in the pure water pipe c enters the pressure tank 19 for storage through the opening of the pressure switch 18. When drinking water is needed, the pure water is finely filtered again through the rear filter element 20 to improve the taste of the water. The pure water outlet F flows out to be drunk. Optionally, the post filter element 20 may be an activated carbon filter element, an ultrafiltration membrane filter element, a softening resin filter element, etc., but is not limited to the types of the above filter elements.

What needs to be explained here is that some components shown in Figure 1 include water inlet solenoid valve 6, pressure gauge 7 in front of the pump, high pressure switch 9, pressure gauge 10 behind the pump, concentrated water pressure gauge 11, and concentrated water flow meter 13 , flushing solenoid valve 14, pure water flowmeter 17, pressure switch 18, pressure tank 19, the structures and working principles of these elements are all prior art, and will not be described in detail here.

In a word, according to the water purification equipment 100 of the embodiment of the present utility model, on the one hand, the excessive water inlet water pressure is reduced through the pressure reducing valve 1, and the water pressure is reduced to within the working range of the water purification equipment 100, so that the water pressure caused by the water pressure can be avoided. Too high will cause huge impact and damage to the filter assembly 5, and at the same time, it can avoid the water leakage risk of the water purification equipment 100 caused by the extremely high water pressure, and ensure the stable operation of the water purification equipment 100; on the other hand, through the source water pump 3 and the low-pressure switch 2 increase the low water inlet water pressure, and increase the water pressure to the working range of the water purification equipment 100, so that when the water pressure is too low, the water intake of the water purification equipment 100 and the total amount of water purification can be avoided. The amount is too small to meet the requirement of drinking water, so as to ensure that the water purification device 100 can continuously and stably provide the required amount of purified water.

In the description of this specification, descriptions referring to the terms "one embodiment", "some embodiments", "a specific embodiment", "a specific example" and the like mean specific features, structures described in connection with the embodiment or example , material or feature is included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the described specific features, structures, materials or characteristics may be combined in any suitable manner in any one or more embodiments or examples. In addition, those skilled in the art can combine and combine different embodiments or examples and features of different embodiments or examples described in this specification without conflicting with each other.

Although the embodiments of the present invention have been shown and described above, it can be understood that the above-mentioned embodiments are exemplary and should not be construed as limitations of the present invention, and those skilled in the art are within the scope of the present invention. Variations, modifications, substitutions and variations can be made to the above-described embodiments.

Claims (10)

1. a water purifying plant, is characterized in that, described water purifying plant has original water inlet, and described water purifying plant comprises:

Filter assemblies, described filter assemblies is connected with described original water inlet by former water inlet pipe, and described filter assemblies is for receiving former water and filtering former water;

Reducing valve, described reducing valve is connected on described former water inlet pipe, with detecting that the hydraulic pressure of described former water inlet pipe lowers the hydraulic pressure of described former water inlet pipe when being greater than setting range value;

For improving the source water pump of hydrodynamicpressure, described source water pump is connected on described former water inlet pipe;

Low-tension switch, described low-tension switch is located at for detecting the hydraulic pressure of described former water inlet pipe on described former water inlet pipe, to open lower than controlling described source water pump during described setting range value at the hydraulic pressure detecting described former water inlet pipe.

2. water purifying plant according to claim 1, is characterized in that, also comprises the first check valve, and described first check valve is connected on described former water inlet pipe, and described first check valve is from described original water inlet to one-way conduction on the direction of described filter assemblies.

3. water purifying plant according to claim 2, is characterized in that, described first check valve and described source water pump are connected in parallel.

4. water purifying plant according to claim 1, is characterized in that, described filter assemblies comprises:

Preposition filter core, described preposition filter core is connected with described former water inlet pipe;

Membrane filtration filter core, described membrane filtration filter core is connected with the outlet of described preposition filter core, and described membrane filtration filter core has pure water mouth and the concentrated mouth of a river, and described pure water mouth is connected with pure water water pipe, the described concentrated mouth of a river is connected with condensed water water pipe, and described condensed water water pipe is in series with waste water variable valve.

5. water purifying plant according to claim 4, is characterized in that, described preposition filter core comprises the many groups of filter core groups be connected in series, and often organizes described filter core group and comprises multiple the first filter core be connected in parallel.

6. water purifying plant according to claim 5, is characterized in that, described filter core group is two groups, often organizes described filter core group and comprises two the first filter cores.

7. water purifying plant according to claim 5, is characterized in that, described preposition filter core also comprises the second filter core, and described second filter core is connected between the described filter core group and described membrane filtration filter core of most downstream.

8. water purifying plant according to claim 4, is characterized in that, also comprises the topping-up pump for improving hydrodynamicpressure, and described topping-up pump is connected between described preposition filter core and described membrane filtration filter core.

9. water purifying plant according to claim 8, it is characterized in that, also comprise waste water reclamation pipe, one end of described waste water reclamation pipe is connected between described waste water variable valve and the described concentrated mouth of a river, and the other end of described waste water reclamation pipe is connected between described topping-up pump and described preposition filter core.

10. water purifying plant according to claim 9, it is characterized in that, also comprise the second check valve, described second check valve is connected on described waste water reclamation pipe, and described second check valve is one-way conduction on the direction from one end of described waste water reclamation pipe to the other end of described waste water reclamation pipe.