CN104030475A - Water purification system with concentrated water making and backwashing functions and water purification method - Google Patents

Abstract

The water purification system and method with concentrated water production and backwashing functions of the present invention include raw water inlet pipes, water pumps, RO membrane filter elements, concentrated water storage tanks, pure water pressure tanks and circuit parts, concentrated water outlets of RO membrane filter elements and the purified water outlet are respectively connected with the concentrated water storage tank and the purified water pressure tank, and the water outlet of the purified water pressure tank is connected with the water extractor through the activated carbon filter element; The circuit is composed of a concentrated water production pipeline with one end extending to the bottom of the concentrated water storage tank and the other end communicating with the water inlet of the water pump. An electric control valve k14 is arranged on the concentrated water production pipeline. The water purification system of the present invention utilizes the concentrated water reprocessing circuit to re-produce water, avoiding the waste of water resources; by setting the L1, L2 and L3 filter element backwash circuits, and the RO filter element forward and backwash and the RO filter membrane backwash The flushing circuit not only ensures the filtering function, but also prolongs the service life, has remarkable beneficial effects, and is convenient for application and promotion.

Description

A water purification system and method with concentrated water production and backwashing functions

technical field

The present invention relates to a water purification system and method with concentrated water production and backwashing functions, more specifically, to a water purification system with concentrated water production and backwashing functions applied to water purification equipment and methods.

Background technique

At present, the known RO water purifier is composed of main components such as a low-pressure switch, a water pump, a water inlet solenoid valve, a high-pressure switch, a flushing solenoid valve, a check valve, a waste water proportional device, and a five-stage filter core. The water quality produced by this kind of machine is excellent, but most of them produce "waste water" (the correct term should be called concentrated water) with a ratio of pure water to waste water of 1:3 or higher during water production, resulting in a lot of waste of water resources. Due to the structure and operation mode, if the pure water produced by the water purifier itself is filtered again, it will also produce "waste water" of 1:3 or higher. This structure and operation mode are very unreasonable. sex. Also due to the structure and operation mode, the filter element needs to be replaced in about three months, resulting in high maintenance costs. There are also manufacturers who use the air bag contraction and release method to backwash the filter element, but because the pressure stored in the air bag is insufficient and uneven, the flushing effect on the filter element is not good.

Contents of the invention

In order to overcome the shortcomings of the above-mentioned technical problems, the present invention provides a water purification system and method applied to water purification equipment with functions of concentrated water production and backwashing.

The water purification system with concentrated water production and backwashing functions of the present invention includes raw water inlet pipes, water pumps, RO membrane filter elements, concentrated water storage tanks, pure water pressure tanks and circuit parts. The RO membrane filter element is provided with water inlets, Concentrated water outlet and purified water outlet; the raw water inlet pipe passes through the L1 filter element, L2 filter element and L3 filter element in turn, and then connects to the water inlet of the water pump. The water outlet of the water pump communicates with the water inlet of the RO membrane filter element. The pure water outlet is connected to the concentrated water storage tank and the pure water pressure tank respectively, and a waste water ratio regulator is installed on the pipeline between the concentrated water outlet of the RO membrane filter element and the concentrated water storage tank; the water outlet of the pure water pressure tank passes through the activated carbon filter element. L5 is connected to the water extractor, and an electric control valve k6 is set on the pipeline between the filter element of L3 and the water inlet of the water pump; its special feature is that it is provided with a concentrated water making circuit, and the concentrated water making circuit is extended from one end Concentrated water production pipeline to the bottom of the concentrated water storage tank, the other end of which communicates with the water inlet of the water pump. The electric control valve k14 is installed on the concentrated water production pipeline, and a water level sensor is provided on the concentrated water storage tank.

The water purification system with concentrated water production and backwashing functions of the present invention includes an L3 filter element backwashing circuit, an L2 filter element backwashing circuit and an L1 filter element backwashing circuit, and the L3 filter element backwashing circuit is connected from the water inlet of the water pump to the The pipeline at the bottom of the concentrated water storage tank, the pipeline connected to the outlet of the water pump and the outlet of the L3 filter element, and the pipeline connected to the water inlet of the L3 filter element and the waste water discharge pipe; the pipeline between the concentrated water storage tank and the water pump is provided with Electric control valve k14, an electric control valve k5 is set on the pipeline between the water pump and the L3 filter element, and an electric control valve k4 is set on the pipeline between the L3 filter element and the waste water discharge pipe; the backwash circuit of the L2 filter element is connected to the water pump The pipeline from the water inlet to the bottom of the concentrated water storage tank, the pipeline connected to the outlet of the water pump and the outlet of the L3 filter element, and the pipeline connected to the water inlet of the L2 filter element and the waste water discharge pipe; the pipeline between the concentrated water storage tank and the pump An electric control valve k14 is set on the road, an electric control valve k5 is set on the pipeline between the water pump and the L3 filter element, and an electric control valve k3 is set on the pipeline between the L2 filter element and the waste water discharge pipe; the backwash circuit of the L1 filter element is composed of The pipeline connected from the water inlet of the water pump to the bottom of the concentrated water storage tank, the pipeline connected to the water outlet of the water pump and the outlet of the L3 filter element, and the pipeline connected to the water inlet of the L1 filter element and the waste water discharge pipe; the connection between the concentrated water storage tank and the water pump An electric control valve k14 is set on the pipeline between the water pump and the L3 filter element, an electric control valve k5 is set on the pipeline between the L1 filter element and the waste water discharge pipe, and an electric control valve k2 is set on the pipeline between the L1 filter element and the waste water discharge pipe.

The water purification system with concentrated water production and backwashing functions of the present invention comprises an RO membrane filter element positive flushing circuit, an RO membrane filter element backwashing circuit and an RO filter membrane backwashing circuit; the RO membrane filter element positive flushing circuit is communicated with The pipeline from the water inlet of the water pump to the bottom of the concentrated water storage tank, the pipeline connected to the outlet of the water pump and the water inlet of the RO membrane filter element, and the pipeline connected to the concentrated water outlet of the RO membrane filter element and the concentrated water storage tank; the concentrated water storage tank An electric control valve k14 is set on the pipeline between the water pump and the water inlet of the RO membrane filter element, an electric control valve k8 is set on the pipeline between the water pump and the water inlet of the RO membrane filter element, and an electric control valve k8 is set on the pipeline between the RO membrane filter element concentrated water outlet and the concentrated water storage tank There is an electric control valve k13; the backwash circuit of the RO membrane filter element is composed of the pipeline connected from the water inlet of the water pump to the bottom of the concentrated water storage tank, the pipeline connected with the water outlet of the water pump and the concentrated water outlet of the RO membrane filter element, and the pipeline connected to the RO membrane The pipeline between the water inlet of the filter element and the waste water discharge pipe; the electric control valve k14 is set on the pipeline between the concentrated water storage tank and the water pump, and the electric control valve k14 is set on the pipeline between the water pump and the concentrated water outlet of the RO membrane filter element. Valve k7, an electric control valve k10 is set on the pipeline between the water inlet of the RO membrane filter element and the waste water discharge pipe; The pipeline between the water outlet and the pure water outlet of the RO membrane filter element and the pipeline connected between the water inlet of the RO membrane filter element and the waste water discharge pipe; the electric control valve k12 and The one-way check valve m4, the electric control valve k9 is set on the pipeline between the water pump and the RO membrane filter pure water outlet, and the electric control valve k10 is set on the pipeline between the RO membrane filter water inlet and the waste water discharge pipe.

The water purification system with concentrated water production and backwashing functions of the present invention includes a domestic water pipeline, which is connected to the pipeline that passes through the L1 filter element, the L2 filter element and the L3 filter element in sequence and is connected to the water inlet of the water pump. The water outlet of the water pump is composed of the pipeline of the water dispenser. .

In the water purification system with concentrated water production and backwashing functions of the present invention, a low-pressure switch, an electric control valve k1 and a one-way check valve m1 are sequentially arranged on the pipeline between the raw water inlet pipe and the L1 filter element. The water outlet of the water pump is provided with a high-pressure switch G1; the pipeline between the purified water outlet of the RO membrane filter element and the purified water pressure barrel is provided with an electric control valve k11, a one-way check valve m3, and a high-pressure switch G2 in sequence. A one-way check valve m2 is arranged on the pipeline between the water pressure barrel and the activated carbon filter element L5.

In the water purification system with concentrated water production and backwashing functions of the present invention, the L1 filter element is a PP cotton filter element or a ceramic filter element, the L2 filter element is an activated carbon or carbon rod filter element, and the L3 filter element is a carbon rod or PP cotton filter element.

In the water purification system with concentrated water production and backwashing functions of the present invention, the electric control valve is an electric valve or a solenoid valve.

The water purification method of the water purification system with concentrated water production and backwashing functions of the present invention is special in that it is realized through the following steps: a). One-time water production, the circuit part controls the electric control valves k1, k6, k8 and k11 are in the open state, and the rest of the electric control valves are in the closed state, start the water pump for a water production; b). Determine whether the water production stop condition is reached, when the circuit part detects that the water level of the concentrated water storage tank has been reached through the water level sensor When the pure water pressure tank is full, the high-pressure switch G2 sends out a water-full signal or the high-pressure switch G1 sends out a pipeline high-pressure fault signal, and the primary water production is stopped; c). Secondary water production, when the primary water production is completed, the pure water pressure tank is not When it is full, it enters the secondary water production stage. The circuit part controls the electric control valves k14, k8, and k11 to be in the open state, and the rest of the electric control valves are in the closed state. Secondary water production; d). Judging whether the secondary water production stop condition is reached. During the secondary water production process, when the circuit part detects that the liquid level in the concentrated water storage tank drops to a certain height through the water level sensor, the high-voltage switch G2 When the water full signal is sent out or the high-pressure switch G1 sends out the pipeline high-pressure fault signal, stop the secondary water production; e). Judge whether the flushing condition is met, and judge whether the number of times of continuous water production reaches the specified number of times. If it reaches a certain number of times and when When the water in the concentrated water storage tank is full, it indicates that flushing should be performed, and step f) is performed; if the number of times of water production does not reach the specified number of times, when the water level in the concentrated water storage tank is not full, continue to perform a water production; f) .Flushing steps, under the control of the circuit part, perform backwashing of the L3 filter element, L2 filter element backwashing, L1 filter element backwashing, RO membrane filter element forward flushing, RO membrane filter element backwashing and RO filter membrane backwashing; L3 filter element backwashing For flushing, the electric control valves k14, k5, and k4 are controlled by the circuit part to be in the open state, and the rest of the electric control valves are in the closed state, the water pump is started, and a certain amount of concentrated water is pumped to backwash the L3 filter element; the L2 filter element backwash is controlled by the circuit part Electric control valves k14, k5 and k3 are in the open state, the rest of the electric control valves are in the closed state, the water pump is started, and a certain amount of concentrated water is drawn to backwash the L2 filter element; the L1 filter element is backwashed, and the circuit part controls the electric control valves k14, K5 and k2 are in the open state, the rest of the electric control valves are in the closed state, the water pump is started, and a certain amount of concentrated water is drawn to backwash the L1 filter element; the RO membrane filter element is being flushed, and the electric control valves k14, k8, and k13 are controlled by the circuit part. In the open state, the rest of the electric control valves are in the closed state, the water pump is started, and a certain amount of concentrated water is drawn to flush the RO membrane filter element; the RO membrane filter element is backwashed, and the circuit part controls the electric control valves k14, k7, and k10 to be in the open state. The rest of the electronically controlled valves are closed, the water pump is started, and a certain amount of concentrated water is drawn to backwash the RO membrane filter element; when the RO filter membrane is backwashed, when the pure water pressure tank is full, the circuit part controls the electronically controlled valves k12 and k9 , k10 is in the open state, and the rest of the electric control valves are In the closed state, the water pump is started, and the RO filter membrane is backwashed with pure water; after the flushing is completed, it waits for a water production stage.

The primary water production is to use raw water for water production, and the secondary water production is to use concentrated water for water production.

The beneficial effects of the present invention are: in the water purification system of the present invention, the raw water inlet pipe communicates with the water inlet of the water pump through the L1 filter element, the L2 filter element and the L3 filter element in sequence, and the water outlet of the water pump passes through the RO membrane filter element to form a sterile and odor-free Purified water realizes the raw water production process; at the same time, due to the installation of the concentrated water production pipeline connecting the concentrated water storage tank and the water pump inlet, the loop of using concentrated water to remake water is realized, which will pass through L1, L2, L3 and The concentrated water filtered by the RO membrane is used for water production again, which avoids a large amount of waste of water resources in the existing pure water production process, and has obvious water-saving effects.

By setting the L1, L2 and L3 filter element backwashing circuits, the water pump can backwash the L1, L2 and L3 filter elements by pumping water from the concentrated water storage tank, which not only ensures that it has a good filtering effect on raw water, but also extends L1 , L2 and L3 filter life. By setting the positive flushing circuit, backwashing circuit and RO filter membrane backwashing circuit of the RO membrane filter element, the RO membrane filter element can be flushed regularly, which not only ensures that the RO membrane filter element always has excellent filtration function, but also prolongs the life of the RO membrane filter element. It avoids the high cost problem caused by the need to replace the RO membrane filter element in a short period of time, and the unreasonable disadvantages of the existing inflatable RO membrane filter element backwashing.

The water purification system and method of the present invention have the functions of concentrated water production and filter element flushing at the same time, and the piping arrangement is reasonable, which realizes the functions of saving water resources and prolonging the service life of the filter element of the water purifier, has significant beneficial effects, and is convenient for application and promotion.

Description of drawings

Fig. 1 is the schematic diagram of the water purification system with concentrated water production and backwashing functions of the present invention;

Fig. 2 is the schematic diagram of raw water water production (i.e.: primary water production) of the water purification system of the present invention;

Fig. 3 is a schematic diagram of concentrated water production (ie: secondary water production) of the water purification system of the present invention;

Fig. 4 is the schematic diagram of the backwashing of the L3 filter element of the water purification system of the present invention;

Fig. 5 is the schematic diagram of the backwashing of the L2 filter element of the water purification system of the present invention;

Fig. 6 is the schematic diagram of the backwashing of the L1 filter element of the water purification system of the present invention;

Fig. 7 is the schematic diagram of the positive flushing of the RO membrane filter element of the water purification system of the present invention;

Fig. 8 is the schematic diagram of the backwashing of the RO membrane filter element of the water purification system of the present invention;

Fig. 9 is the schematic diagram of the RO filter membrane backwash of the water purification system of the present invention;

Fig. 10 is a schematic diagram of the domestic water pipeline of the water purification system of the present invention.

In the figure: 1 low pressure switch, 2 water pump, 3 waste water proportional regulator, 4 water level sensor, 5 concentrated water storage tank, 6 pure water pressure tank, 7 L1 filter element, 8 L2 filter element, 9 L3 filter element, 10 RO membrane filter element L4, 11 Activated carbon filter element L5, 12 Water fetcher, 13 Raw water inlet pipe; k1~k14 are electric control valves, m1, m2, m3, m4 are one-way check valves, G1, G2 are high-pressure switches.

Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

As shown in Figure 1, the principle diagram of the water purification system with concentrated water production and backwashing functions of the present invention is provided, which includes a raw water inlet pipe 13, a low pressure switch 1, a water pump 2, a waste water proportional regulator 3, a water level Sensor 4, concentrated water storage tank 5, pure water pressure tank 6, L1 filter element 7, L2 filter element 8, L3 filter element 9, RO membrane filter element 10, activated carbon filter element L5 (11), water dispenser 12, raw water inlet pipe 13, electric control Valves k1~k14, one-way check valves (m1, m2, m3, m4), high-pressure switches G1 and G2, and the circuit part; the pipelines from the raw water inlet pipe 13 to the water inlet of the L1 filter element 7 are set in sequence with low-pressure Switch 1, electric control valve k1 and one-way check valve m1, the low-pressure switch 1 is set on the pipeline through the three-way fitting to realize the function of low-pressure detection of raw water. When the low-pressure switch 1 detects that the water pressure is too low, the water pump will be stopped 2 Pumping operation from the raw water inlet pipe 13; the electric control valve k1 controls the on-off state of the pipeline, and the one-way check valve m1 is used to ensure that the raw water always flows to one end of the filter element 7 of L1. The raw water flowing out of the one-way check valve m1 passes through the L1 filter element 7, the L2 filter element 8, the L3 filter element 9 and the electric control valve k6 in sequence, and then is delivered to the water inlet of the water pump 2, and the water outlet of the water pump 2 passes through the high pressure switch G1, the electric control The valve k8 is connected to the water inlet of the RO membrane filter element 10, and the high-pressure switch G1 realizes the high-pressure fault detection of the water outlet pipeline of the water pump. When the water pressure at the output end of the water pump is detected to be too high through the high-pressure switch G1, the operation of the water pump 2 will be stopped to avoid damage The water pump 2 and the pipeline; the electric control valve k8 realizes the on-off control of the pipeline between the water pump 2 and the RO membrane filter element 10 .

The concentrated water outlet of the shown RO membrane filter element 10 communicates with the concentrated water storage tank 5 through the waste water ratio regulator 3 . The water level sensor 4 is arranged in the concentrated water storage tank 5 for detecting the liquid level in the concentrated water storage tank 5 . The pure water outlet of the RO membrane filter element 10 is connected to the pure water pressure tank 6 through the electric control valve k11, the one-way check valve m3, and the high-pressure switch G2 in sequence. The high-pressure switch G2 is used to detect whether the pure water pressure tank 6 is full; The barrel mouth of the pure water pressure barrel 6 communicates with the water inlet of the activated carbon filter element L5 (11) through the one-way check valve m2, and the water outlet of the activated carbon filter element L5 (11) is connected with the water dispenser 12 to realize the taking of pure water.

As shown in Figure 2, the schematic diagram of raw water production in the present invention is provided. The raw water flowing in from the raw water inlet pipe 13 is pumped by the water pump 2, filtered by the L1 filter element, the L2 filter element and the L3 filter element successively, and then input To the water inlet of the RO membrane filter element 10, after being filtered by the RO membrane filter element 10, the pure water flows into the pure water pressure tank 6 through the purified water outlet of the RO membrane filter element 10, and the concentrated water flows into the purified water pressure tank 6 through the concentrated water outlet of the RO membrane filter element 10. In the concentrated water storage tank 5, the process of utilizing raw water to produce water is realized. The pipeline between the concentrated water outlet of the RO membrane filter element 10 and the concentrated water storage tank 5 is provided with a waste water proportional regulator 3, that is, a proportional valve, for controlling the purity. The ratio of water to concentrated water is generally about 1:3, that is, the ratio of pure water to concentrated water produced by the RO membrane filter element 10 is 1:3. Undoubtedly, a large amount of water will be generated during the production of pure water. It is undoubtedly a waste if a large amount of concentrated water is not re-filtered and utilized. During the raw water production process, the circuit part controls the electric control valves k1, k6, k8, and k11 to be open, and the rest of the electric control valves is off.

As shown in Figure 3, the schematic diagram of concentrated water production in the present invention is provided, one end of the shown concentrated water production pipeline extends into the bottom of the concentrated water storage tank 5, and the other end communicates with the water inlet of the water pump 2 , under the action of the water pump 2, the "concentrated water" in the concentrated water storage tank 5 is pumped to the water inlet of the RO membrane filter element 10 for re-filtering, so as to realize the purpose of making full use of the concentrated water to regenerate water. In the process of concentrated water production, except for the electric control valves k14, k8, and k11, which are in the open state, the rest of the electric control valves should be in the closed state.

As shown in Figure 4, the schematic diagram of the backwashing of the L3 filter element in the present invention is provided. The water outlet of the water pump 2 communicates with the water outlet of the L3 filter element 9 through the high pressure switch G1 and the electric control valve k5 successively, and the water inlet of the L3 filter element 9 The electric control valve k4 is connected to the waste water discharge pipe, and the water pump 2 pumps out the water in the concentrated water storage tank through the concentrated water making circuit, forcing the water to enter from the water outlet of the L3 filter element and discharge from the water inlet, and the washed water is discharged through the waste water The backwashing process of the L3 filter element is formed. During the backwashing process of the L3 filter element, except for the electric control valves k14, k5, and k4 which are in the open state, the rest of the electric control valves should be in the closed state.

As shown in FIG. 5 , the schematic diagram of the backwashing of the L2 filter element is given, and the water inlet of the L2 filter element 8 shown communicates with the waste water discharge pipe through a pipeline provided with a solenoid valve k3. The water pump 2 pumps out the water in the concentrated water storage tank 5, passes through the pipeline where the high-pressure switch G1 and the electric control valve k5 are located, and the L3 filter element 9, and then flows into the water outlet of the L2 filter element 8, and the passing water enters through the water outlet of the L2 filter element 8 , The water inlet is discharged to realize the backwashing of the L2 filter element 8. During the backwashing process of the L2 filter element, except the electric control valves k14, k5, and k3 are in the open state, the rest of the electric control valves should be in the closed state. During the backwashing process of the L2 filter element 8, although the water flows through the L3 filter element 9, the backwashing of the L2 filter element 8 will not be affected if the L3 filter element 9 is flushed first.

As shown in Figure 6, the schematic diagram of the backwashing of the L1 filter element is given. The water inlet of the L1 filter element 7 shown in the figure is connected to the waste water discharge pipe after passing through the pipeline where the electric control valve k2 is located. The water pump 2 pumps out the water in the concentrated water storage tank 5, and inputs it to the water outlet of the L1 filter element 7 through the pipeline where the high-pressure switch G1 and the electric control valve k5 are located, the L3 filter element 9, and the L2 filter element 8, and passes the water through the outlet of the L1 filter element 7. The water outlet flows in and the water inlet flows out to realize the backwashing of the L1 filter element 7, and the water after flushing flows out through the waste water discharge pipe. During the backwashing process of the L1 filter element, except the electric control valves k14, k5, and k2 are in the open state, the rest of the electric control valves should be in the closed state. During the backwashing process of the L1 filter element 7, although water flows through the L3 filter element 9 and the L2 filter element 8, if the L3 filter element 9 and the L2 filter element 8 are flushed first, the backwashing of the L1 filter element 7 will not be affected.

The activated carbon filter element L5 is installed at the water outlet end of the pure water pressure tank 6, which mainly plays the role of antibacterial and adjusting the taste of the water, making the purified water sweet and sweet; since the activated carbon filter element L5 always flows through pure water, there is no need to adjust the activated carbon filter element. L5 performs backwashing operation.

As shown in FIG. 7 , the principle diagram of the positive flushing of the RO membrane filter element in the present invention is given. The concentrated water outlet of the RO membrane filter element 10 shown in the figure communicates with the concentrated water storage tank 5 after passing through the pipeline where k13 is located. After the water pump 2 pumps out the water in the concentrated water storage tank 5, it is input to the water inlet of the RO membrane filter element 10 through the high pressure switch G1 and the electric control valve k8, and the incoming water is discharged into the concentrated water through the concentrated water outlet of the RO membrane filter element 10. In the water storage bucket 5, to realize the positive flushing of the RO membrane filter element. During the positive flushing process of the RO membrane filter element, except for the electric control valves k14, k8 and k13 which are in the open state, the rest of the electric control valves should be in the closed state.

As shown in Figure 8, the schematic diagram of backwashing of RO membrane filter element 10 in the present invention is provided, and the water outlet of water pump 2 shown is connected with the RO membrane filter element 10 after being provided with a high-pressure switch G1 and an electric control valve k7 pipeline. The concentrated water outlet is connected, and the water inlet of the RO membrane filter element 10 is connected to the waste water discharge pipe through the pipeline where the electric control valve k10 is located. The water pump 2 pumps out the water in the concentrated water storage tank 5 and inputs it to the concentrated water outlet of the RO membrane filter element 10 , and discharges it through the water inlet of the RO membrane filter element 10 to realize backwashing of the RO membrane filter element 10 . During the backwashing process of the RO membrane filter element, only the electric control valves k14, k7, and k10 are in the open state, and the rest of the electric control valves are in the closed state.

As shown in Figure 9, the schematic diagram of RO filter membrane backwashing in the present invention is given. The water outlet of the pure water pressure barrel 6 is connected to the water pump through the pipeline where the electric control valve k12 and the one-way check valve m4 are located. The water inlets of 2 are connected, and the water outlet of water pump 2 is connected with the pure water outlet of RO membrane filter element 10 after passing through the high pressure switch G1 and the electric control valve k9. The water pump 2 extracts the pure water in the pure water pressure tank 6, and sends it to the pure water outlet of the RO membrane filter element 10 through the pipeline where the electric control valve k9 is located. Drain to realize the backwash of the RO filter membrane. The purpose of installing the one-way check valve m4 on the pipeline between the pure water pressure tank 6 and the water inlet of the water pump 2 is to prevent the water that has not been filtered by the RO filter membrane from entering the pure water at the moment when the electric control valve k12 is turned on and off. 6 in the water pressure barrel. During the backwashing process of the RO filter membrane, only the electric control valves k12, k9, and k10 are in the open state, and the rest of the electric control valves are in the closed state.

As shown in Figure 10, the principle diagram of the domestic water circuit in the present invention is provided, the raw water in the raw water inlet pipe shown is filtered by the L1 filter element 7, the L2 filter element 8, and the L3 filter element 9, and then pumped to the water intake by the water pump 2 In the device 12, it is used as daily water. When taking domestic water, only the electric control valves k1 and k6 are in the open state, and the rest of the electric control valves are in the closed state.

The electric control valves k1~k14 mentioned above can be electric valves or solenoid valves, the L1 filter element 7 is a PP cotton filter element or a ceramic filter element, the L2 filter element 8 is an activated carbon or carbon rod filter element, and the L3 filter element 9 is a carbon rod or PP cotton filter element. Raw water production, concentrated water production, backwashing of L3 filter element, backwashing of L2 filter element, backwashing of L1 filter element, forward flushing of RO membrane filter element, backwashing of RO membrane filter element, and backwashing of RO filter element are all realized through the control of the circuit part.

Claims (8)

1. A water purification system with concentrated water production and backwashing functions, including raw water inlet pipe (13), water pump (2), RO membrane filter element (10), concentrated water storage tank (5), pure water pressure tank (6) As well as the circuit part, the RO membrane filter element is provided with a water inlet, a concentrated water outlet and a pure water outlet; the raw water inlet pipe passes through the L1 filter element (7), L2 filter element (8) and L3 filter element (9) in sequence, and then connects to the water pump The water inlet of the water pump is connected to the water inlet of the RO membrane filter element, the concentrated water outlet and the pure water outlet of the RO membrane filter element are respectively connected to the concentrated water storage tank and the pure water pressure tank, and the concentrated water outlet of the RO membrane filter element is connected to the concentrated water outlet. A waste water ratio regulator (3) is installed on the pipeline between the water storage tanks; the outlet of the pure water pressure tank is connected to the water dispenser (12) through the activated carbon filter element L5, and the pipeline between the L3 filter element and the water inlet of the water pump is installed There is an electric control valve k6; it is characterized in that it is provided with a concentrated water production circuit, and the concentrated water production circuit is composed of a concentrated water production pipeline with one end extending into the bottom of the concentrated water storage tank and the other end communicating with the water inlet of the water pump , the electric control valve k14 is set on the concentrated water production pipeline, and the water level sensor is set on the concentrated water storage tank. 2. The water purification system with concentrated water production and backwashing functions according to claim 1, characterized in that: it includes an L3 filter element backwash circuit, an L2 filter element backwash circuit and an L1 filter element backwash circuit; The backwash circuit of the L3 filter element is composed of a pipeline connected to the water inlet of the water pump (2) to the bottom of the concentrated water storage tank (5), a pipeline connected to the water outlet of the water pump and the outlet of the L3 filter element, and a pipeline connected to the water inlet of the L3 filter element and the waste water The pipeline composition of the discharge pipe; the electric control valve k14 is set on the pipeline between the concentrated water storage tank and the water pump, the electric control valve k5 is set on the pipeline between the water pump and the L3 filter element, and the electric control valve k5 is set on the pipeline between the L3 filter element and the waste water discharge pipe. An electric control valve k4 is set on the pipeline; The backwash circuit of the L2 filter element is composed of a pipeline connected to the water inlet of the water pump to the bottom of the concentrated water storage tank, a pipeline connected to the water outlet of the water pump and the outlet of the L3 filter element, and a pipeline connected to the water inlet of the L2 filter element and the waste water discharge pipe. ; An electric control valve k14 is set on the pipeline between the concentrated water storage tank and the water pump, an electric control valve k5 is set on the pipeline between the water pump and the L3 filter element, and an electric control valve k5 is set on the pipeline between the L2 filter element and the waste water discharge pipe. valve k3; The backwash circuit of the L1 filter element is composed of a pipeline connected to the water inlet of the water pump to the bottom of the concentrated water storage tank, a pipeline connected to the water outlet of the water pump and the outlet of the L3 filter element, and a pipeline connected to the water inlet of the L1 filter element and the waste water discharge pipe ; An electric control valve k14 is set on the pipeline between the concentrated water storage tank and the water pump, an electric control valve k5 is set on the pipeline between the water pump and the L3 filter element, and an electric control valve k5 is set on the pipeline between the L1 filter element and the waste water discharge pipe. Valve k2. 3. The water purification system with concentrated water production and backwashing functions according to claim 1 or 2, characterized in that: it includes a positive flushing circuit of RO membrane filter element, a backwashing circuit of RO membrane filter element and a backwashing circuit of RO membrane filter element ; The positive flushing circuit of the RO membrane filter element is composed of a pipeline connected to the water inlet of the water pump to the bottom of the concentrated water storage tank, a pipeline connected to the water outlet of the water pump (2) and the water inlet of the RO membrane filter element (10), and connected to the RO membrane filter element. Concentrated water outlet and pipeline of concentrated water storage tank; electric control valve k14 is set on the pipeline between the concentrated water storage tank and the water pump, and electric control valve k8 is set on the pipeline between the water pump and the water inlet of the RO membrane filter element. An electric control valve k13 is installed on the pipeline between the concentrated water outlet of the RO membrane filter element and the concentrated water storage tank; The backwash circuit of the RO membrane filter element is composed of a pipeline connected to the water inlet of the water pump to the bottom of the concentrated water storage tank, a pipeline connected to the water outlet of the water pump and the concentrated water outlet of the RO membrane filter element, and a pipeline connected to the water inlet of the RO membrane filter element and the waste water discharge. The pipeline between the pipes is composed of: an electric control valve k14 is set on the pipeline between the concentrated water storage tank and the water pump, an electric control valve k7 is set on the pipeline between the water pump and the concentrated water outlet of the RO membrane filter element, and the RO membrane filter element An electric control valve k10 is arranged on the pipeline between the water inlet and the waste water discharge pipe; The RO filter membrane backwash circuit is composed of a pipeline connected to the pure water pressure tank and the water pump inlet, a pipeline connected to the water pump outlet and the RO membrane filter element pure water outlet, and a pipeline connected to the RO membrane filter element water inlet and the waste water discharge pipe. The pipeline between the pure water pressure barrel and the water pump is equipped with an electric control valve k12 and a one-way check valve m4 in sequence, and the pipeline between the water pump and the purified water outlet of the RO membrane filter element is equipped with an electric control valve. Valve k9, an electric control valve k10 is arranged on the pipeline between the water inlet of the RO membrane filter element and the waste water discharge pipe. 4. The water purification system with concentrated water production and backwashing functions according to claim 1 or 2, characterized in that it includes domestic water pipelines, and the domestic water pipelines pass through L1 filter element (7) and L2 filter element ( 8) and the L3 filter element (9) and the pipeline connected to the water inlet of the water pump (2), and the pipeline connected to the water outlet of the water pump and the water dispenser. 5. The water purification system with concentrated water production and backwashing functions according to claim 1 or 2, characterized in that: the pipeline between the raw water inlet pipe (13) and the L1 filter element (7) is arranged in sequence There is a low-pressure switch (1), an electric control valve k1 and a one-way check valve m1, and the water outlet of the water pump (2) is provided with a high-pressure switch G1; the purified water of the RO membrane filter (10) is exported to the purified water The pipeline between the pressure tanks is equipped with an electric control valve k11, a one-way check valve m3, and a high-pressure switch G2 in sequence, and a one-way check valve m2 is set on the pipeline between the pure water pressure tank and the activated carbon filter element L5 (11). . 6. The water purification system with concentrated water production and backwashing functions according to claim 1 or 2, characterized in that: the L1 filter element (7) is a PP cotton filter element or a ceramic filter element, and the L2 filter element (8) is Activated carbon or carbon rod filter element, L3 filter element (9) is a carbon rod or PP cotton filter element. 7. The water purification system with concentrated water production and backwashing functions according to claim 1 or 2, wherein the electric control valve is an electric valve or a solenoid valve. 8. a kind of water purification method based on the water purification system with strong water production and backwashing function according to claim 1, is characterized in that, realizes by following steps: a). One-time water production, the circuit part controls the electric control valves k1, k6, k8, and k11 to be in the open state, and the rest of the electric control valves are in the closed state, and the water pump is started for one-time water production; b). Judging whether the primary water production stop condition is reached, when the circuit part detects that the water level of the concentrated water storage tank is full through the water level sensor, the pure water pressure tank sends a full water signal through the high-voltage switch G2 or the high-voltage switch G1 sends a pipeline high-voltage fault When signal, stop water production once; c). Secondary water production. When the primary water production is completed and the pure water pressure tank is not full, it enters the secondary water production stage. The circuit part controls the electric control valves k14, k8, and k11 to be open, and the rest of the electric control valves are closed. state, the water pump pumps out the water in the concentrated water storage tank and filters it through the RO membrane filter element for secondary water production; d). Judging whether the secondary water production stop condition is reached. During the secondary water production process, when the circuit part detects that the liquid level in the concentrated water storage tank drops to a certain height through the water level sensor, the high-voltage switch G2 sends out a water full signal Or when the high-pressure switch G1 sends a pipeline high-pressure fault signal, stop the secondary water production; e). Judging whether the flushing condition is met, judging whether the number of times of continuous water production reaches the specified number of times, if it reaches a certain number of times and when the water in the concentrated water storage tank is full, it indicates that flushing should be performed, and step f) is performed; if one time of water production When the number of times of water does not reach the specified number of times or the water level in the concentrated water storage tank is not full, the primary water production and secondary water production will continue; f). The flushing step, under the control of the circuit part, performs backwashing of the L3 filter element, L2 filter element backwashing, L1 filter element backwashing, RO membrane filter element forward flushing, RO membrane filter element backwashing and RO filter membrane backwashing; For backwashing of L3 filter element, the electric control valves k14, k5, and k4 of the circuit part are in the open state, and the rest of the electric control valves are in the closed state, the water pump is started, and a certain amount of concentrated water is drawn to backwash the L3 filter element; For backwashing of L2 filter element, the electric control valves k14, k5, and k3 of the circuit part are in the open state, and the rest of the electric control valves are in the closed state, the water pump is started, and a certain amount of concentrated water is pumped to backwash the L2 filter element; For backwashing of L1 filter element, the electric control valves k14, k5, and k2 of the circuit part are in the open state, the rest of the electric control valves are in the closed state, the water pump is started, and a certain amount of concentrated water is drawn to backwash the L1 filter element; The RO membrane filter element is flushing, the electronic control valves k14, k8, and k13 of the circuit part are in the open state, and the rest of the electric control valves are in the closed state, the water pump is started, and a certain amount of concentrated water is pumped to carry out positive flushing of the RO membrane filter element; Backwashing of the RO membrane filter element, when the pure water pressure tank is full, the circuit part controls the electric control valves k14, k7, k10 to be in the open state, the rest of the electric control valves are in the closed state, the water pump is started, and a certain amount of concentrated water is drawn to the RO The membrane filter element is backwashed; RO filter membrane backwashing, the circuit part controls the electric control valves k12, k9, k10 to be in the open state, the rest of the electric control valves are in the closed state, the water pump is started, and the RO filter membrane is backwashed with pure water; After flushing, wait to enter a water production stage.