CN204588844U - A water purifier without waste water - Google Patents

Abstract

The utility model relates to the technical field of water purifiers, in particular to a wastewater-free water purifier, which comprises a pre-filter, a water inlet solenoid valve, a booster pump, a filter element mechanism and an RO (reverse osmosis) membrane which are sequentially connected through a pipeline, wherein the pre-filter is connected with a raw water pipeline; the forced-ventilated protection pipeline is provided with a normally closed electromagnetic valve, a bypass pipeline is arranged between the raw water pipeline and the living pipeline, the bypass pipeline is provided with a water flow switch and a one-way valve, and the water flow switch, the normally open electromagnetic valve, the normally closed electromagnetic valve, the booster pump and the circulating pump are respectively electrically connected with the electric control device. The water purifier can realize that concentrated water is not required to be discharged when pure water is prepared, the function of no waste water discharge is achieved, and the concentrated water is reasonably used when domestic water is used.

Description

A water purifier without waste water

technical field

The utility model relates to the technical field of water purifiers, in particular to a waste water-free water purifier.

Background technique

RO reverse osmosis membrane direct drinking machine is also called RO reverse osmosis membrane water purifier. The full name of RO in English is: Reverse Osmosis, which is reverse osmosis. The reverse osmosis membrane filter cartridge is equipped with a reverse osmosis membrane filter element. Under a certain pressure, water molecules can pass through the RO membrane, while impurities such as inorganic salts, heavy metal ions, organic matter, colloids, bacteria, and viruses in the water cannot pass through the RO membrane. membrane, so that part of the water is separated through the RO membrane, and the unpermeable water forms concentrated water due to the increase of solute. Reverse osmosis membrane water purifiers were used in industrial fields such as seawater and brackish water desalination, boiler feed water, and wastewater treatment in the early days, and have been introduced into civilian fields in recent years.

Although reverse osmosis treatment technology has many advantages, it produces a part of concentrated water while producing purified water. Usually, the ratio of purified water to wastewater of RO membrane is 1:3, that is to say, after one purification and filtration, the produced Concentrated water is about 3 times that of purified water.

The previous reverse osmosis membrane water purifiers were concentrated water discharge type, that is, the concentrated water after primary purification and filtration was discharged directly as waste water, which is indeed a great waste, especially for small household and commercial water purifiers. , the raw water is tap water, and the water quality of the concentrated water produced after one purification and filtration is not worse than that of the raw water. Increase the cost of water purification, but also a waste of water resources.

Contents of the invention

The purpose of this utility model is to provide a non-wastewater water purifier for the above-mentioned deficiencies in the prior art. Prolong the service life of the RO membrane, and reduce the TDS value of pure water. The quality of pure water is high, and it can also effectively increase the flow of domestic water.

The purpose of this utility model is achieved through the following technical solutions.

A water purifier without waste water, comprising a pre-filter, a water inlet solenoid valve, a booster pump, a filter element mechanism and an RO membrane connected sequentially through pipelines, the water purifier also includes a circulating pump, a water flow switch, a one-way valve, normally open solenoid valve, normally closed solenoid valve, high pressure switch, water storage tank and post filter,

The pre-filter is connected to the raw water pipeline, the water purification outlet of the RO membrane is connected to a water purification outlet pipe, and the outlet end of the water purification outlet pipe is respectively connected to a pure water pipe and a water purification return pipe. The normally open solenoid valve and the one-way valve are arranged in turn in the direction of water flow, the outlet end of the clean water return pipe is connected to the outlet end of the water inlet solenoid valve, and the normally closed solenoid valve is arranged in turn in the pure water pipe along the direction of water flow. Electromagnetic valve, the one-way valve and the post-filter, the water outlet of the post-filter is connected with a pure water faucet, the pure water pipe at the water inlet of the post-filter passes through the water storage pipeline and the water storage bucket connected; the high pressure switch is set on the water storage pipeline;

The concentrated water outlet of the RO membrane is connected with a concentrated water outlet pipe, the concentrated water outlet pipe is provided with the circulation pump, and the outlet ends of the concentrated water outlet pipe are respectively connected with a concentrated water return pipe, a domestic water pipeline and a forced discharge protection pipeline, The water outlet end of the concentrated water return pipe is connected to the water outlet end of the booster pump, the concentrated water return pipe is provided with the one-way valve, the water outlet end of the domestic water pipeline is connected with a domestic water faucet, and the strong discharge protection pipeline is provided with the described Normally closed solenoid valve, the outlet of the normally closed solenoid valve of the forced discharge protection pipeline is connected to the sewer pipe;

A bypass pipeline is provided between the raw water pipeline and the domestic water pipeline, and the bypass pipeline is provided with the water flow switch and the one-way valve;

The water purifier also includes an electric control device, the water inlet solenoid valve, the water flow switch, the high pressure switch, the normally closed solenoid valve, the normally open solenoid valve, the booster pump and the The circulating pumps are respectively electrically connected with the electric control device.

The outlet end of the bypass pipeline is connected with the domestic water faucet.

The flux of the circulating water of the water purifier passing through the surface of the RO membrane per unit time is 2.0 L/min.

The ratio of the flow rate of the bypass line to the flow rate of the raw water line passing through the water purifier is 1:1.

The water purifier also includes a cleaning solution for cleaning the RO membrane, and the cleaning solution is food-grade citric acid or white vinegar.

The filter element mechanism includes a primary filter element, a secondary filter element and a tertiary filter element which are sequentially connected in series.

The first-stage filter element is an origami filter element with a pore size of 20 μm, the second-stage filter element is an activated carbon filter element, the third-stage filter element is a PP cotton filter element, and the post-filter is a post-position activated carbon filter element.

The filter element mechanism includes a secondary composite filter element and a tertiary composite filter element connected in parallel, the water outlet ends of the secondary composite filter element and the tertiary composite filter element are respectively connected to the water inlet end of the RO membrane, and the front The filter is an origami filter element with a pore size of 20 μm.

The primary filter element is an origami filter element with a pore diameter of 20 μm, the secondary composite filter element and the tertiary composite filter element are composite filter elements of activated carbon and PP cotton, and the outer layer of the composite filter element is PP cotton with a pore size of 1-5 μm. PP cotton is filled with sintered activated carbon.

The beneficial effects of the utility model :

(1) The utility model realizes that concentrated water does not need to be discharged when producing pure water, and that concentrated water can be used rationally when using domestic water.

Concentrated water is not waste water. It is water filtered by PP cotton and activated carbon, and it is better than tap water. Concentrated water becomes circulating water and is purified many times. No waste water discharge function. Traditionally speaking, as the amount of pure water produced gradually increases, the concentration of circulating water also increases. High-concentration circulating water will affect the service life of the RO membrane, and will also affect the quality of pure water (the TDS value of pure water increases. high). The water purifier not only does not affect the service life of the RO membrane, but effectively prolongs the service life of the RO membrane, and does not affect the quality of pure water. The reasons are as follows:

A. By changing the position of the booster pump, directly pressurize the entire circulation system; remove the restrictor valve on the concentrated water pipeline to meet the conditions for open flow of concentrated water, and increase the circulation pump to make the circulating water flow at a rate of 2 liters per minute The flow rate circulates quickly, and the surface of the RO membrane is washed with large-flux circulating water while the water is produced, so that the probability of calcium, magnesium ions and colloids in the water adhering to the surface of the RO membrane is greatly reduced, thus achieving the function of washing while producing water.

B. Because of the addition of a large-flux circulation system, the water purifier itself has the function of cleaning the RO membrane with drugs. When the calcium, magnesium ions and colloids in the water block the RO membrane when the traditional model is used, the water production is seriously insufficient. Only the RO membrane can be replaced. However, this water purifier can clean the RO membrane with medicines, so as to prolong the service life of the RO membrane. The water yield of the RO membrane after cleaning with drugs has reached the level of the new RO membrane, and its service life has been extended by more than 3 times compared with the traditional model.

C. Because of the existence of a large-flow circulation system, the flow and velocity of the water flowing through the surface of the RO membrane under the action of the circulation pump when the water purifier is producing water are three times that of the traditional model (with a 100-gallon RO membrane For example: the concentrated water discharge of the traditional model is 600--700 ml/min, that is, the flux of concentrated water passing through the surface of RO membrane per unit time, and the flux of concentrated water passing through the surface of RO membrane per unit time of this water purifier is 2000 ml/min) Due to the increased flux, the TDS value of pure water produced is lower than that of traditional models.

(2) The utility model can effectively increase the flow rate of domestic water.

In the existing non-wastewater discharge reverse osmosis water purifier, the domestic water completely passes through the water purifier. Due to the resistance of the filter element, the water volume of the domestic water is reduced. In order to increase the domestic water consumption, the water purifier of the utility model is A bypass pipeline is added between the raw water pipeline and the domestic water faucet to increase the domestic water consumption. The ratio of the flow of the bypass pipeline to the flow of the raw water pipeline passing through the water purifier is 1:1, thereby effectively increasing the domestic water consumption. flow.

(3) The utility model can effectively improve the service life of the RO membrane pretreatment filter element. The reasons are as follows:

A. After adopting the bypass pipeline, the flow rate through the water pipe of the water purifier is doubled, so the life of the RO membrane pretreatment filter element is doubled.

B. Change the structure and arrangement of the PP cotton and activated carbon pretreatment filter before the RO membrane. The original first-stage filter element is a 5-micron pore-diameter PP cotton filter element, and the third-stage filter element is a 1-micron pore-diameter PP cotton filter element. Due to the difference in the aperture of the secondary filter elements Not much, when actually filtering impurities in water, the lifespan of the first-stage filter element and the third-stage filter element is very different. Large particles make the entire filter system perform coarse filtration first and then fine filtration, and the surface area of the origami filter element is several times larger than that of the PP cotton filter element, thus prolonging the service life. The secondary filter element and the tertiary filter element are composite filter elements. The structure of the composite filter element is that the outer layer is a PP cotton filter material with a pore size of 1-5 microns, and its function is to filter smaller particles in the raw water. The inner layer is sintered activated carbon , its main function is to adsorb residual chlorine in raw water, and the adsorption capacity of sintered activated carbon is more than 2 times stronger than that of granular carbon. Connecting the secondary composite filter element and the tertiary composite filter element in parallel can exert their effects more effectively. By changing the connection method and changing the structure of the filter element, the efficacy and service life of the pre-treatment of the RO membrane can be maximized.

(4) The non-wastewater reverse osmosis water purifier of the present utility model adds a strong discharge protection function, when the consumption of domestic water is relatively small, that is, when the continuous production of pure water is 6 liters and the domestic water consumption does not reach 6 liters ( When the amount of domestic water reaches 6 liters, the concentrated water in the water machine can be completely replaced with raw water) The forced discharge protection solenoid valve is opened through the electronic control device for forced discharge, and the forced discharge protection solenoid valve is automatically closed after 6 liters are discharged and accumulated again The water production time is the water production volume, so as to solve the damage to the RO membrane caused by the abnormal use of the water purifier and protect the RO membrane. The continuous production of 6 liters of pure water as the strong discharge protection node is only set in consideration of the relationship between the actual pure water consumption and the TDS value of pure water, that is, the quality of pure water.

Description of drawings

Utilize accompanying drawing to further illustrate the utility model, but the embodiment in the accompanying drawing does not constitute any restriction to the present utility model, for those of ordinary skill in the art, under the premise of not paying creative work, also can obtain according to following accompanying drawing Additional drawings.

Fig. 1 is the functional block diagram of embodiment 1 of the present utility model;

Fig. 2 is the functional block diagram of embodiment 2 of the present utility model;

Fig. 3 is the water production curve figure of the initial 2 minutes water production of the 100 gallons model of the utility model;

Fig. 4 is the graph of the mixed water TDS value of Fig. 3;

Fig. 5 is the curve diagram of the water production volume after the initial 2 minutes water production of the 100 gallon model of the utility model;

FIG. 6 is a graph of the TDS value of the mixed water of FIG. 5 .

Reference signs include:

10——Raw water pipeline 20——Pre-filter 30——Inlet solenoid valve

40——Boost pump 51——First-stage filter element 52——Secondary filter element

53——three-stage filter element 54——two-stage composite filter element 55——three-stage composite filter element

60—RO membrane 71—clean water outlet pipe

711—Clear water return pipe 712—Pure water pipe 72—Concentrated water outlet pipe

721——concentrated water return pipe 722——domestic water pipeline 723——forced discharge protection pipeline

80——electric control device 90——normally open solenoid valve 100——one-way valve

110——Normal closed solenoid valve 120——Post filter 130——Water storage bucket

140——Circulation pump 160——Bypass pipeline 170——Water flow switch

180——Life water faucet 190——Pure water faucet 200——Water storage pipe

210——high voltage switch.

Detailed ways

The utility model is further described in conjunction with the following examples, see Fig. 1-6.

Example 1

As shown in Figure 1, a kind of non-wastewater water purifier of the present embodiment comprises the pre-filter 20, water inlet solenoid valve 30, booster pump 40, filter element mechanism and RO membrane 60 connected sequentially through pipelines, said The water purifier also includes a circulation pump 140, a water flow switch 170, a one-way valve 100, a normally open solenoid valve 90, a normally closed solenoid valve 110, a high pressure switch 210, a water storage tank 130 and a post filter 120,

The pre-filter 20 is connected to the raw water pipeline 10, the water purification outlet of the RO membrane 60 is connected to a water purification outlet pipe 71, and the outlet end of the water purification outlet pipe 71 is respectively connected to a pure water pipe 712 and a water purification return pipe 711, the clean water return pipe 711 is sequentially provided with the normally open solenoid valve 90 and the one-way valve 100 along the water flow direction, the outlet end of the clean water return pipe 711 is connected to the water outlet end of the water inlet solenoid valve 30, pure The water pipe 712 is sequentially provided with the normally closed solenoid valve 110, the one-way valve 100 and the post-filter 120 along the water flow direction. The pure water pipe 712 at the water inlet end of the filter 120 is connected to the water storage bucket 130 through the water storage pipeline 200; the high pressure switch 210 is arranged on the water storage pipeline 200;

The concentrated water outlet of the RO membrane 60 is connected with a concentrated water outlet pipe 72, the concentrated water outlet pipe 72 is provided with the circulation pump 140, and the outlet end of the concentrated water outlet pipe 72 is respectively connected with a concentrated water return pipe 721 and a domestic water pipeline. 722 and strong discharge protection pipeline 723, the outlet end of the concentrated water return pipe 721 is connected to the outlet end of the booster pump 40, the concentrated water return pipe 721 is provided with the check valve 100, and the outlet end of the domestic water pipeline 722 is connected to There is a faucet 180 for domestic use, the forced discharge protection pipeline 723 is provided with the normally closed solenoid valve 110, and the outlet of the normally closed solenoid valve 110 of the forced discharge protection pipeline 723 is connected to the sewer pipe;

A bypass pipeline 160 is provided between the raw water pipeline 10 and the domestic water pipeline 722, and the bypass pipeline 160 is provided with the water flow switch 170 and the one-way valve 100;

The water purifier also includes an electric control device 80, the water inlet solenoid valve 30, the water flow switch 170, the high pressure switch 210, the normally closed solenoid valve 110, the normally open solenoid valve 90, the The booster pump 40 and the circulation pump 140 are respectively electrically connected to the electric control device 80 .

Specifically, the outlet end of the bypass line 160 is connected to the domestic faucet 180 .

Firstly, the utility model realizes that concentrated water does not need to be discharged when producing pure water, and that concentrated water can be used rationally when domestic water is used.

Concentrated water is not waste water. It is water filtered by PP cotton and activated carbon, and it is better than tap water. Concentrated water becomes circulating water and is purified many times. No waste water discharge function. Traditionally speaking, as the amount of pure water produced gradually increases, the concentration of circulating water also increases. High-concentration circulating water will affect the service life of RO membrane 60, and also affect the quality of pure water (pure water TDS value elevated). The water purifier not only does not affect the service life of the RO membrane 60 but effectively prolongs the service life of the RO membrane 60 without affecting the quality of pure water produced.

A. By changing the position of the booster pump 40, directly pressurize the entire circulation system; remove the restrictor valve on the concentrated water pipeline so as to have the condition of open flow of concentrated water, increase the circulating pump 140 to make the circulating water flow at 2 per minute The flow rate of liters circulates quickly, and the surface of the RO membrane 60 is washed with large-flux circulating water while the water is produced, so that the probability of calcium, magnesium ions and colloids in the water adhering to the surface of the RO membrane 60 is greatly reduced, thus achieving water production while flushing function.

B. Because of the addition of a large-flux circulation system, the water purifier itself has the function of cleaning the RO membrane 60 with drugs. When using traditional models, once the calcium, magnesium ions and colloids in the water block the RO membrane 60, the water production will be serious. Insufficient, only the RO membrane 60 can be replaced. And this water purifier can carry out medicine cleaning to RO membrane 60, prolong the service life of RO membrane 60 with this. The water yield of the RO membrane 60 cleaned by medicines has reached the level of the new RO membrane 60, and its service life has been extended by more than 3 times compared with the traditional model.

C. Because of the existence of a large-flow circulation system, when the water purifier is producing water, under the action of the circulation pump 140, the flow and velocity of the water passing through the surface of the RO membrane 60 are 3 times that of the traditional model, (100 gallons Take RO membrane 60 as an example: the concentrated water discharge of traditional models is 600--700 ml/min, that is, the flux of concentrated water passing through the surface of RO membrane 60 per unit time, and the concentrated water of this water purifier passes through the surface of RO membrane 60 per unit time The flux is 2000ml/min) Due to the increased flux, the TDS value of pure water produced is lower than that of traditional models.

Among them, the utility model can effectively increase the flow rate of domestic water: in the existing reverse osmosis water purifier without waste water discharge, the domestic water completely passes through the water purifier, and due to the resistance of the filter element, the water volume of domestic water is reduced. In order to increase the domestic water consumption of the utility model water purifier, a bypass pipeline 160 is added between the raw water pipeline 10 and the domestic water faucet 180 to increase the domestic water consumption. The ratio of the flow rate is 1:1, thus effectively increasing the flow rate of domestic water.

The flux of the circulating water of the water purifier passing through the RO membrane surface per unit time is 2.0L/min, that is, the circulation rate of the circulating pump is 2.0L/min, and the large flux of the circulating pump is used to make the water purifier of the present utility model It has the function of cleaning the RO membrane 60.

The water purifier also includes a cleaning solution for cleaning the RO membrane 60. The cleaning solution is food-grade citric acid or white vinegar, which is convenient for material collection and low in cleaning cost. The specific implementation is as follows: when the flow rate of the water produced by the water machine drops or is used as a maintenance drug for cleaning, first cut off the water and power, turn on the domestic water faucet 180 to remove the pressure in the water machine, and remove any pre-membrane pretreatment filter bottle, Drain the circulating water in the same proportion as the cleaning solution, reinstall the filter bottle after filling the liquid medicine, and only allow the circulating pump 140 to work after power transmission. The cleaning pharmaceutical industry circulates the drug to flush the RO membrane 60 under the action of the circulating pump 140. The cleaning time of the drug is determined according to the degree of clogging of the RO membrane 60. After the cleaning time is reached, the machine is shut down, and then the raw water ball valve is opened to completely clean the cleaning solution in all filter bottles with tap water. It is replaced from the faucet 180 for domestic use, so as to complete the work of cleaning the RO membrane 60 with the medicine.

The filter element mechanism in this embodiment includes a primary filter element 51 , a secondary filter element 52 and a tertiary filter element 53 connected in series in sequence.

In this embodiment, the primary filter element 51 is an origami filter element with a pore size of 20 μm, the secondary filter element 52 is an activated carbon filter element, the tertiary filter element 53 is a PP cotton filter element, and the post filter 120 is a post activated carbon filter element.

In addition, the non-wastewater reverse osmosis water purifier of the utility model has added a strong discharge protection function. When the consumption of domestic water is relatively small, that is, when the continuous production of pure water is 6 liters and the domestic water consumption does not reach 6 liters (use When the amount of domestic water reaches 6 liters, the concentrated water in the water machine can be completely replaced with raw water) through the electric control device 80, the forced discharge protection solenoid valve is opened for forced discharge, and the forced discharge protection solenoid valve is automatically closed after 6 liters are discharged and accumulated again The water production time is the water production volume, so as to solve the damage to the RO membrane 60 caused by abnormal use of the water machine, and to protect the RO membrane 60 .

The water purifier of the present utility model is powered on and started each time, the normally closed electromagnetic valve 110 is closed, the normally open electromagnetic valve 90 is opened, and the pure water is re-filtered before entering the booster pump 40, and the normally open electromagnetic valve 90 is closed after 2 minutes of water production. The normally closed solenoid valve 110 is opened to enter the normal water production state, and the water purification and return operation can effectively solve the problem of high TDS of water production by the RO membrane 60 in the first 2 minutes.

As shown in Figure 3-6, the change curve of the initial 2-minute water production volume and the TDS value of the water produced by the water purifier of the utility model, and the water production volume and the TDS value of the produced water after 2 minutes of water production The change curve, the following data table can be obtained:

Note: The pure water production conditions of 100 gallons (G) RO membrane under standard conditions are: water temperature 25°C, raw water TDS 500ppm, pure water flow rate 266ml/min.

Example 2

As shown in Figure 2, the filter element mechanism of the present embodiment comprises a secondary composite filter element 54 and a tertiary composite filter element 55 connected in parallel, and the water outlets of the secondary composite filter element 54 and the tertiary composite filter element 55 are respectively connected to the The water inlet end of the RO membrane 60 is connected, and the pre-filter 20 is an origami filter element with a pore size of 20 μm.

The first-stage filter element 51 of the present embodiment is an origami filter element with an aperture of 20 μm, and the second-stage composite filter element 54 and the third-stage composite filter element 55 are composite filter elements of activated carbon and PP cotton, and the outer layer of the composite filter element is a composite filter element with an aperture of 1- 5μm PP cotton, PP cotton is filled with sintered activated carbon.

The function of the origami filter element is to filter larger particles in the raw water, so that the whole filter system can perform coarse filtration first and then fine filtration, and the surface area of the origami filter element is several times larger than that of the PP cotton filter element, thus prolonging the service life. The function of the composite filter element is to filter small particles in the raw water. The inner layer is sintered activated carbon. Its main function is to absorb residual chlorine in the raw water. Compared with granular carbon, the adsorption capacity of sintered activated carbon is more than 2 times stronger. Connecting the secondary composite filter element 54 and the tertiary composite filter element 55 in parallel can exert their effects more effectively. By changing the connection mode and the structure of the filter element, the efficiency and service life of the pretreatment before the RO membrane 60 can be improved to the greatest extent.

The rest of this embodiment is the same as Embodiment 1, and will not be repeated here.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present utility model, rather than limiting the protection scope of the present utility model. Although the utility model has been described in detail with reference to the preferred embodiments, those skilled in the art Personnel should understand that the technical solution of the utility model can be modified or equivalently replaced without departing from the essence and scope of the technical solution of the utility model.

Claims (7)

1. A kind of waste water purifier, it is characterized in that: comprise the pre-filter connected successively by pipeline, water inlet electromagnetic valve, booster pump, filter element mechanism and RO membrane, described water purifier also comprises circulation pump , water flow switch, one-way valve, normally open solenoid valve, normally closed solenoid valve, high pressure switch, water storage tank and post filter, The pre-filter is connected to the raw water pipeline, the water purification outlet of the RO membrane is connected to a water purification outlet pipe, and the outlet end of the water purification outlet pipe is respectively connected to a pure water pipe and a water purification return pipe. The normally open solenoid valve and the one-way valve are arranged in turn in the direction of water flow, the outlet end of the clean water return pipe is connected to the outlet end of the water inlet solenoid valve, and the normally closed solenoid valve is arranged in turn in the pure water pipe along the direction of water flow. Electromagnetic valve, the one-way valve and the post-filter, the water outlet of the post-filter is connected with a pure water faucet, the pure water pipe at the water inlet of the post-filter passes through the water storage pipeline and the water storage bucket connected; the high pressure switch is set on the water storage pipeline; The concentrated water outlet of the RO membrane is connected with a concentrated water outlet pipe, the concentrated water outlet pipe is provided with the circulation pump, and the outlet ends of the concentrated water outlet pipe are respectively connected with a concentrated water return pipe, a domestic water pipeline and a forced discharge protection pipeline, The water outlet end of the concentrated water return pipe is connected to the water outlet end of the booster pump, the concentrated water return pipe is provided with the one-way valve, the water outlet end of the domestic water pipeline is connected with a domestic water faucet, and the strong discharge protection pipeline is provided with the described Normally closed solenoid valve, the outlet of the normally closed solenoid valve of the forced discharge protection pipeline is connected to the sewer pipe; A bypass pipeline is provided between the raw water pipeline and the domestic water pipeline, and the bypass pipeline is provided with the water flow switch and the one-way valve; The water purifier also includes an electric control device, the water inlet solenoid valve, the water flow switch, the high pressure switch, the normally closed solenoid valve, the normally open solenoid valve, the booster pump and the The circulating pumps are respectively electrically connected with the electric control device. 2. A non-waste water purifier according to claim 1, characterized in that: the outlet end of the bypass pipeline is connected to the faucet for domestic use. 3. A non-waste water purifier according to claim 1, characterized in that: said water purifier also includes a cleaning solution for cleaning the RO membrane, and the cleaning solution is food-grade citric acid or white vinegar. 4. The non-waste water purifier according to any one of claims 1-3, characterized in that: the filter element mechanism includes a primary filter element, a secondary filter element and a tertiary filter element which are sequentially connected in series. 5. A non-waste water purifier according to claim 4, characterized in that: the first-stage filter element is an origami filter element with a pore size of 20 μm, the second-stage filter element is an activated carbon filter element, and the third-stage filter element is PP cotton A filter element, the post filter is a post activated carbon filter element. 6. A kind of non-waste water purifier according to any one of claims 1-3, characterized in that: the filter element mechanism includes a secondary composite filter element and a tertiary composite filter element connected in parallel, and the secondary composite filter element The filter element and the water outlet end of the three-stage composite filter element are respectively connected to the water inlet end of the RO membrane, and the pre-filter is an origami filter element with a pore size of 20 μm. 7. A kind of waste water-free water purifier according to claim 6, characterized in that: said secondary composite filter element and said three-stage composite filter element are composite filter elements of activated carbon and PP cotton, and the outer layer of the composite filter element It is PP cotton with a pore size of 1-5 μm, and the PP cotton is filled with sintered activated carbon.