CN206666253U - Water purifier and water cleaning systems - Google Patents

Abstract

The utility model discloses a water purifier and a water purifying system, wherein the water purifier comprises: a membrane filter element, which has a water inlet connected with a raw water pipe, a pure water port connected with a pure water pipe, and a waste water connected with a waste water pipe Backflow regulating valve, its water inlet is connected with the waste water port of the membrane filter element, and its water outlet is connected with the water inlet of the membrane filter element; the first TDS detector is installed in the raw water pipe to detect the DS value of the raw water passing through the raw water pipe; The controller is electrically connected with the backflow regulating valve and the first TDS detector respectively; the controller adjusts the opening degree of the backflow valve according to the result of the first TDS value detection. In this way, part of the wastewater discharged from the membrane filter element re-enters the membrane filter element for filtration, thereby improving the utilization rate of water.

Description

Water purifiers and water purification systems

technical field

The utility model relates to the technical field of water purification, in particular to a water purifier and a water purification system.

Background technique

Existing water purifiers usually include pre-filter elements, membrane filter elements, and post-filter elements; among them, the membrane filter element is the core component of the water purifier, and the membrane filter element is a reverse osmosis membrane filter element, also known as a spiral-wound reverse osmosis membrane. Filter element, the membrane filter element adopts cross-flow filtration, which also produces waste water while producing clean water.

The amount of wastewater discharged by the membrane filter element of the existing water purifier is fixed. However, when the TDS value of the influent water of the membrane filter element is high, that is, the salt content of the influent water of the membrane filter element is relatively high, which will lead to a decrease in the amount of wastewater discharged. Insufficient, and then it is easy to cause the reverse osmosis membrane surface membrane of the membrane filter element to be blocked; when the influent TDS value of the membrane filter element is low, the wastewater flow rate of the membrane filter element is relatively large, which will waste water resources and cause Water waste.

Utility model content

The main purpose of this utility model is to propose a water purifier, aiming at improving the utilization rate of water.

In order to achieve the above object, a kind of water purifier that the utility model proposes, it comprises:

The membrane filter element has a water inlet connected to the raw water pipe, a pure water port connected to the pure water pipe, and a waste water port connected to the waste water pipe;

A backflow regulating valve, the water inlet end of the backflow regulating valve communicates with the waste water port of the membrane filter element, and the water outlet end of the backflow regulating valve communicates with the water inlet of the membrane filter element;

A first TDS detector installed on the raw water pipe to detect the DS value of the raw water passing through the raw water pipe; and,

A controller is electrically connected to the backflow regulating valve and the first TDS detector respectively; the controller adjusts the opening degree of the backflow valve according to the detection result of the first TDS value.

Preferably, the waste water pipe is provided with a waste water regulating valve electrically connected to the controller and a second TDS detector, and the controller adjusts the waste water regulating valve according to the result detected by the second TDS detector of the opening.

Preferably, the water purifier further includes a pre-filter element, the water inlet of the pre-filter element communicates with the water source, and the water outlet of the pre-filter element communicates with the water inlet end of the raw water pipe.

Preferably, the water purifier further includes a booster pump, the water inlet end of the booster pump communicates with the raw water pipe and the water outlet end of the backflow regulating valve, and the water outlet end of the booster pump communicates with the The water inlet of the membrane filter element is connected.

Preferably, the water purifier further includes a rear filter element, the water inlet of the rear filter element communicates with the water outlet end of the pure water pipe.

Preferably, the water purifier also includes:

The water inlet valve is installed on the raw water pipe;

a water storage part connected to the water outlet end of the pure water pipe; and,

The first detection part is electrically connected with the controller, and the first detection part is arranged on the pipeline connecting the pure water pipe and the water storage part, and the controller detects the first detection part according to the The result controls the water inlet valve on/off.

Preferably, the water storage part is a pressure tank, the first detection part is a pressure switch, and the controller controls the on/off of the pressure switch according to the detection result of the pressure switch.

Preferably, the water purifier further includes a second detection part electrically connected to the controller, and the second detection part is arranged between the water pump and the external water outlet; the controller and the second detection part according to the first The detection results of the two detection parts control the on/off of the water pump.

Preferably, the water purifier further includes a flow-limiting valve electrically connected to the controller, the flow-limiting valve is set in parallel with the water pump; the controller controls The opening/closing of the restrictor valve.

The utility model also proposes a water purification system, the water purification system also includes, the water purifier includes:

The membrane filter element has a water inlet connected to the raw water pipe, a pure water port connected to the pure water pipe, and a waste water port connected to the waste water pipe;

A backflow regulating valve, the water inlet end of the backflow regulating valve communicates with the waste water port, and the water outlet end of the backflow regulating valve communicates with the water inlet;

A first TDS detector installed on the raw water pipe to detect the TDS value of the raw water passing through the raw water pipe; and,

A controller is electrically connected to the backflow regulating valve and the first TDS detector; when the first TDS detector detects that the raw water TDS value is greater than a first preset value, the controller controls the backflow regulating valve The opening of the valve increases; when the first TDS detector detects that the TDS value of the raw water is less than a first preset value, the controller controls the opening of the backflow regulating valve to decrease or remain unchanged.

The utility model detects the TDS value of the raw water entering the membrane filter element by setting the first TDS detector, and also sets the backflow regulating valve to connect the waste water port and the water inlet of the membrane filter element, so that the controller can detect the TDS value according to the first TDS detector. The raw water TDS value is used to control the opening of the backflow regulating valve, so that part of the wastewater discharged from the wastewater outlet of the membrane filter element re-enters the membrane filter element for filtration, so that the water entering the membrane filter element can be fully filtered, thereby improving water utilization.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description These are only some embodiments of the present utility model, and those skilled in the art can also obtain other drawings according to the structures shown in these drawings without creative work.

Fig. 1 is the structural representation of an embodiment of the utility model water purifier;

Fig. 2 is the structural representation of another embodiment of the utility model water purifier;

Fig. 3 is a structural schematic diagram of another embodiment of the water purifier of the present invention.

Explanation of reference numbers:

The realization of the purpose of the utility model, functional characteristics and advantages will be further described in conjunction with the embodiments and with reference to the accompanying drawings.

detailed description

The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Example. Based on the embodiments of the present utility model, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of the present utility model.

It should be noted that if there is a directional indication (such as up, down, left, right, front, back...) in the embodiment of the present utility model, the directional indication is only used to explain the position in a certain posture (as shown in the accompanying drawing). If the relative positional relationship, movement conditions, etc. between the components shown in the figure below are changed, if the specific posture changes, the directional indication will also change accordingly.

In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present utility model, the descriptions of "first", "second", etc. Implying their relative importance or implying the number of technical features indicated. Thus, the features defined as "first" and "second" may explicitly or implicitly include at least one of these features. In addition, the technical solutions of the various embodiments can be combined with each other, but it must be based on the realization of those skilled in the art. When the combination of technical solutions is contradictory or cannot be realized, it should be considered that the combination of technical solutions does not exist , also not within the scope of protection required by the utility model.

In order to improve the utilization rate of water, the utility model proposes a new water purifier, please refer to FIG. 1 , which shows a schematic structural diagram of an embodiment of the water purifier of the utility model.

The water purifier 100 includes a membrane filter element 1 , a backflow regulating valve 2 , a first TDS detector 3 , a controller (not shown) and other components.

The above-mentioned membrane filter element 1 has a water inlet a, a pure water outlet b and a waste water outlet c; its water inlet a is connected with the raw water pipe, that is, it is connected with the tap water pipe; its pure water outlet b is connected with the pure water pipe, and passes through the pure water pipe It flows into the water tank and is stored for use by users; the waste water port c is connected with the waste water pipe for the waste water in the membrane filter element 1 to be discharged.

The water inlet end of the backflow regulating valve 2 communicates with the waste water port c of the membrane filter element 1 , and the water outlet end of the backflow regulating valve 2 communicates with the water inlet a of the membrane filter element 1 . The opening of the backflow regulating valve 2 is adjustable, the maximum opening of the backflow regulating valve 2 is 1, the actual opening of the backflow regulating valve 2=the current opening of the backflow valve/100%, and the backflow regulating valve 2 can be a one-way The valve may also be a two-way valve, which is not specifically limited here.

The above-mentioned first TDS detector 3 is installed on the raw water pipe, which is mainly used to detect the TDS value of the raw water entering the membrane filter element 1 through the raw water pipe. The TDS value refers to the amount of total dissolved solids in water, and the measurement unit is mg/L, which indicates how many mg of dissolved solids are dissolved in 1 liter of water. The higher the TDS value, the more impurities are contained in the water. The TDS value of the raw water to be filtered will not only affect the filtration quality of the membrane filter element 1, but also affect the service life of the membrane filter element 1.

The above-mentioned controller is electrically connected to the backflow regulating valve 2 and the first TDS detector 3 , and the controller can be a single-chip microcomputer or a PW signal controller, which is not specifically limited here.

When the water purifier 100 performs water purification work, the first TDS detector 3 detects the TDS value of the raw water passing through the raw water pipe, and sends the detected result to the controller; the controller compares the detection result sent by the first TDS detector 3 with The first preset value is compared, that is, the raw water TDS value is compared with the first preset value. If the raw water TDS value is greater than the first preset value, it is determined that the raw water TDS value passing through the raw water pipe is too high. Filtration is performed quickly, and only a small part of the raw water entering the membrane filter element 1 is filtered as raw water. At this time, the controller controls the opening of the backflow regulating valve 2 to increase, which increases the discharge of wastewater in the membrane filter element 1. speed, and when the waste water is discharged from the waste water port c of the membrane filter element 1, it can also carry impurities out, which is beneficial to ensure the normal operation of the reverse osmosis membrane in the membrane filter element 1; a part of the waste water discharged from the waste water port c of the membrane filter element 1 passes through the waste water pipe The other part flows through the backflow regulating valve 2 and then flows back into the membrane filter element 1, so that the wastewater discharged from the membrane filter element 1 is filtered for the second time, that is, the water intake of the membrane filter element 1 is increased in disguise, and so on. Filtration improves the utilization rate of the raw water and ensures the service life of the membrane filter element 1 at the same time. If the TDS value of the raw water is less than the first preset value, it is determined that the TDS value of the raw water passing through the raw water pipe is relatively low, that is, the water quality of the raw water is relatively good. At this time, the controller can control the opening of the backflow regulating valve 2 to remain unchanged or decrease. This is beneficial to ensure that the raw water in the membrane filter element 1 is fully utilized, that is, the raw water in the membrane filter element 1 is filtered into clean water as much as possible, thereby improving the utilization rate of the raw water.

The utility model detects the TDS value of raw water entering the membrane filter element 1 by setting the first TDS detector 3, and at the same time also sets the backflow regulating valve 2 to connect the waste water port c and the water inlet a of the membrane filter element 1, so that the controller can be used according to the first TDS value. The TDS value of the raw water detected by the TDS detector 3 is used to control the opening of the backflow regulating valve 2, so that part of the wastewater discharged from the waste water outlet c of the membrane filter element 1 re-enters the membrane filter element 1 for filtration, so that it enters the membrane filter element The water in 1 can be fully filtered, thereby improving the utilization rate of water.

In an embodiment of the present utility model, the water purifier 100 is also provided with a waste water regulating valve 4 and a second TDS detector 5, the waste water regulating valve 4 and the second TDS detector 5 are both arranged on the waste water pipe, the The waste water regulating valve 4 controls the waste water flow size of the waste water pipe by adjusting its opening, and the second TDS detector 5 is used to detect the average TDS value of the waste water passing through the waste water pipe in the first preset time period, and the average TDS value of the waste water The TDS value is sent to the controller, and the controller controls the wastewater regulating valve 4 to work according to the average TDS value of the wastewater.

Specifically, when the water purifier 100 performs water purification work, the second TDS detector 5 detects the average TDS value of the waste water passing through the waste water pipe within the first preset time period, and sends the detected result to the controller; The device compares the average TDS value of the waste water sent by the second TDS detector 5 with the second preset value, and if the average TDS value of the waste water is less than the second preset value, then it is determined that the waste water discharged from the waste water port c of the membrane filter element 1 is still It can be reused, that is, the waste water discharged from the waste water port c of the membrane filter element 1 can also be filtered again. At this time, the controller controls the opening of the waste water regulating valve 4 to decrease or remain unchanged, so as to reduce or keep the waste water discharged from the membrane filter element 1 In this way, the amount of waste water flowing back into the membrane filter element 1 is increased in a disguised form, thereby improving the utilization rate of water. If the average TDS value of the wastewater detected by the second TDS detector 5 in the first preset time period is greater than or equal to the second preset value, the controller controls the wastewater regulating valve 4 to increase to a preset opening, and continues for the second 2. Preset time period. Preferably, when the average TDS value of the wastewater detected by the second TDS detector 5 within the first preset time period is greater than or equal to the second preset value, the controller controls the opening of the wastewater regulating valve 4 to the maximum opening. In this way, the wastewater discharge speed and discharge volume of membrane filter element 1 are increased, so that the wastewater in membrane filter element 1 can be discharged in time. The scale is washed out, which is beneficial to prolong the service life of the membrane filter element 1. In this embodiment, not only the utilization rate of water is further improved, but also the automatic cleaning of the water purifier 100 is realized, the service life of the membrane filter element 1 is prolonged, and thus the service life of the water purifier 100 is extended.

In order to prevent the waste water regulating valve 4 from being blocked by scale, the waste water pipe is also provided with an antiscalant module 6 located directly at the water inlet end of the waste water regulating valve 4 and the waste water pipe. Specifically, the antiscalant module 6 includes an antiscalant, and the antiscalant is preferably a phosphate substance, such as silicon phosphorus crystal. The scale inhibitor can precipitate phosphate substances to form soluble complexes with calcium and magnesium ions in water, thereby preventing the formation of calcium and magnesium salts and other scales. Of course, the antiscalant can also be a non-phosphate substance. In the embodiment of the present utility model, the type of the antiscalant is not limited, as long as the antiscalant can be used to prevent the formation of scale. In order to prevent the antiscalant from being washed away by the waste water, the antiscalant module 6 is also provided with a filter screen, which can be sheet-shaped, and is arranged between the waste water regulating valve 4 and the antiscalant to prevent the antiscalant from following The waste water flows out, and of course, the filter screen can also surround and form an accommodating chamber for placing the antiscalant.

Further, the waste pipe is also provided with a first one-way valve 7 between the antiscalant module 6 and the water inlet of the waste water pipe, and the water inlet of the waste water pipe is connected to the water inlet connected to the backflow regulating valve 2 And on the pipeline of the waste water port c of the membrane filter element 1. The setting of the first one-way valve 7 can not only prevent the waste water from flowing back to the backflow regulating valve 2; meanwhile, it can also prevent the scale inhibitor dissolved in the waste water from flowing back to the backflow regulating valve 2, thereby avoiding secondary pollution to the waste water.

In one embodiment of the present utility model, the water purifier 100 is also provided with a pre-filter 8, and the water inlet a of the pre-filter 8 communicates with an external water source, that is, communicates with a tap water pipe. The water outlet is connected with the water inlet end of the raw water pipe, that is, the water outlet of the pre-filter element 8 is connected with the water inlet a of the membrane filter element 1 . The pre-filter element 8 can be a PP cotton filter element, also known as a melt-blown PP filter element, which can effectively remove various particulate impurities in raw water, has a multi-layer deep structure, and has a large amount of dirt, and is suitable for water purification. pre-processing stage. Set the pre-filter 8 in front of the raw water pipe, so as to prevent the particle impurities in the raw water from being adsorbed on the first TDS detector 3 and affect the detection accuracy of the first TDS detector 3, and at the same time prevent the particle impurities in the raw water from flowing with the water impact on the first TDS detector 3 at the same time, which is beneficial to ensure the service life of the first TDS detector 3 .

It should be noted that the number of the above-mentioned pre-filter elements 8 may be one or multiple arranged in series, which may be set according to the actual situation, and no specific limitation is made here.

Further, the water outlet of the pre-filter 8 is also provided with a drain pipe, so that the water purifier 100 can provide water of various water qualities for users to use.

In an embodiment of the present utility model, the water purifier 100 is also provided with a booster pump 9 electrically connected to the controller, the water inlet end of the booster pump 9 is connected to the raw water pipe and the outlet end of the backflow regulating valve 2 The water outlet of the booster pump 9 communicates with the water inlet a of the membrane filter element 1 . The booster pump 9 is set so that the external raw water and the waste water flowing through the backflow regulating valve 2 are all pressurized when flowing through the booster pump 9, thus ensuring that the water entering the membrane filter element 1 has a certain pressure, thereby ensuring The water entering the membrane filter element 1 can quickly permeate the reverse osmosis membrane.

Further, the booster pump 9 adopts a variable frequency water pump 14. Since the rotating speed of the variable frequency water pump 14 is adjustable, the rotating speed of the variable frequency water pump 14 can be adjusted according to the water production speed of the membrane filter element 1, thereby facilitating the control of the speed of the membrane filter element 1. water intake.

In an embodiment of the present utility model, the water purifier 100 is also provided with a rear filter element 10, and the water inlet a of the rear filter element 10 communicates with the water outlet end of the pure water pipe, that is, the inlet of the rear filter element 10 The water port a communicates with the pure water port b of the membrane filter element 1, and the water outlet of the rear filter element 10 communicates with the external pipeline. In an embodiment of the present utility model, the post filter element 10 can be an activated carbon filter element, and the activated carbon filter element mainly uses activated carbon as the main raw material, which can remove residual chlorine, peculiar smell, etc. Improve user experience.

It should be noted that the number of the above-mentioned post-filter elements 10 may be one or multiple arranged in series, which may be set according to the actual situation, and no specific limitation is made here.

In an embodiment of the present utility model, please refer to FIG. 2 , the water purification device further includes a water inlet valve 11 , a water storage part 12 , a first detection part 13 and the like.

Specifically, the water inlet valve 11 is installed on the raw water pipe, and it is used to control the on-off of the raw water pipe, so that the work of the membrane filter element 1 can be controlled. The water storage part 12 is connected with the water outlet of the pure water pipe, and it is used to store the purified water filtered by the membrane filter element 1 for the user to take, which solves the problem that the user needs to wait when taking the purified water. The first detection part 13 is electrically connected with the controller, and the first detection part 13 is arranged on the pipeline connecting the pure water pipe and the water storage part 12 to detect the water volume in the water storage part 12 .

When the water purifier 100 is turned on and produces purified water, the purified water formed after being filtered by the membrane filter element 1 flows out from the pure water port b of the membrane filter element 1 and flows into the water storage element 12. At the same time, the first detection element 13 Detect the amount of water in the water storage part 12. The first detection part 13 can specifically detect the flow rate of clean water flowing into the water storage part 12 within a preset time, detect the water pressure in the water storage part 12, and detect the water pressure of the water storage part 12. The height of the liquid level inside, the weight of the water storage part 12, etc., that is, the first detection part 13 can be a pressure switch, a water level detection device, a weight detection device, etc., which are not specifically limited here. When the first detection part 13 detects that the water volume of the water storage part 12 reaches the preset value, the controller controls the water inlet valve 11 to close, so that the external raw water no longer flows in, and the controller also controls the booster pump 9 to stop working , so that the entire water purifier 100 stops working. Such setting realizes that the water purifier 100 can automatically produce purified water, making the water purifier 100 more intelligent and convenient for users to use.

The above-mentioned water storage part 12 can be a pressure tank. When the first detection part 13 is a pressure switch, when the pressure tank is full of water, the water can no longer enter the pressure tank and flow back. At this time, the pressure switch senses the pressure of the backflow water and will Send a signal to the controller, the controller controls the pressure switch to close according to the signal sent by the pressure switch, and at the same time controls the water inlet valve 11 to close, thus avoiding water overflow caused by the water purifier 100 still working when the pressure tank is full of water problem arises.

Please refer to Fig. 3, the above-mentioned water storage part 12 is a water bag, and the water purification device is also provided with a water pump 14 electrically connected to the controller, the water inlet end of the water pump 14 communicates with the water bag, and the water outlet end of the water pump 14 is connected to the outside The water outlet d is connected. When the user needs water, the controller controls the water pump 14 to start to extract the pure water in the water bag.

Further, the water purification device also includes a second detection part 15 arranged between the water pump 14 and the external water outlet d, the second detection part 15 is used to detect the switch of the external water outlet d, the controller and the second detection part 15 electrical connection. When the second detection part 15 detects that the external water outlet d is open, the controller controls the water pump 14 to turn on; when the second detection part 15 detects that the external water outlet d is closed, the controller controls the water pump 14 to close.

Specifically, the second detection element 15 can be a contact sensor, a pressure sensor, etc., that is, it senses whether the water outlet valve is open by contacting the water outlet valve at the external water outlet d, or judges whether the water outlet valve is opened by detecting the change in the pressure of the water outlet end. Whether the water outlet is open. Preferably, the second detection element 15 is a pressure switch, and a second one-way valve 16 is provided between the pressure switch and the water pump 14 , and the pressure switch is used to detect the pressure at the water outlet of the second one-way valve 16 . By setting the second one-way valve 16, the pure water flowing to the external water outlet d is prevented from backflowing. When the external water outlet d is closed, since the pure water continuously flows to the external water outlet d, the external water outlet d and the second The pressure in the pipeline between the one-way valves 16 increases; when the pressure switch detects that the pressure at the external water outlet d increases, it indicates that the user does not need to use pure water, so the controller controls the water pump 14 to stop working.

The water purification device also includes a flow limiting valve 17 electrically connected to the controller, and the flow limiting valve 17 is arranged in parallel with the water pump 14, that is, one end of the flow limiting valve 17 is connected between the water pump 14 and the water storage member 12, and the other end Connected between the water pump 14 and the second one-way valve 16; the controller controls the flow limiting valve 17 to close when the external water outlet d is open, and the controller controls the flow limiting valve 17 to open when the external water outlet d is closed. Specifically, when the external water outlet d is opened, if the flow limiting valve 17 is opened, the water pumped out by the water pump 14 will flow back from the flow limiting valve 17 to the water inlet of the water pump 14, so when the external water outlet d is opened, it is necessary to Close the flow limiting valve 17; when the external water outlet d is closed, if the water pump 14 is still working to extract the water in the water bag, it is necessary to open the flow limiting valve 17 so that the extracted water flows back through the flow limiting valve 17. In the water bag to avoid excessive water pressure at the external water outlet d.

In order to prevent the water from the external water outlet d from flowing back into the membrane filter element 1 , the water purifier is also provided with a third one-way valve 18 at the pure water pipe adjacent to the pure water port b of the membrane filter element 1 .

It should be noted that, in the embodiment of the present utility model, the control method of the controller controlling each component is an existing one, and in the present utility model, only the connection method of the above-mentioned components is protected.

The utility model also proposes a water purification system, the water purification system includes a water purifier, the specific structure of the water purifier refers to the above-mentioned embodiments, because the water purification system uses all the technical solutions of all the above-mentioned embodiments, so All the beneficial effects brought by the technical solutions of the above embodiments will not be repeated here.

The above is only a preferred embodiment of the utility model, and does not limit the patent scope of the utility model. Under the utility model concept of the utility model, the equivalent structural transformation made by using the specification of the utility model and the contents of the accompanying drawings, Or directly/indirectly used in other related technical fields are all included in the patent protection scope of the present utility model.

Claims (11)

1. A water purifier, characterized in that, comprising: The membrane filter element has a water inlet connected to the raw water pipe, a pure water port connected to the pure water pipe, and a waste water port connected to the waste water pipe; A backflow regulating valve, the water inlet end of the backflow regulating valve communicates with the waste water port of the membrane filter element, and the water outlet end of the backflow regulating valve communicates with the water inlet of the membrane filter element; A first TDS detector installed on the raw water pipe to detect the DS value of the raw water passing through the raw water pipe; and, A controller is electrically connected to the backflow regulating valve and the first TDS detector respectively; the controller adjusts the opening degree of the backflow valve according to the detection result of the first TDS value. 2. The water purifier according to claim 1, wherein the waste water pipe is provided with a waste water regulating valve and a second TDS detector electrically connected to the controller, and the controller according to the The result detected by the second TDS detector adjusts the opening degree of the wastewater regulating valve. 3. The water purifier according to claim 1, wherein the water purifier also includes a pre-filter, the water inlet of the pre-filter communicates with the water source, and the water outlet of the pre-filter communicates with the water source. The water inlet end of the raw water pipe is connected. 4. The water purifier according to claim 1, characterized in that, the water purifier also comprises a booster pump, and the water inlet end of the booster pump is connected to the water outlet of the raw water pipe and the return regulating valve. Both ends are connected, and the water outlet of the booster pump is connected with the water inlet of the membrane filter element. 5. The water purifier according to claim 1, further comprising a rear filter element, the water inlet of the rear filter element communicates with the water outlet end of the pure water pipe. 6. The water purifier according to any one of claims 1-5, wherein the water purifier further comprises: The water inlet valve is installed on the raw water pipe; a water storage part connected to the water outlet end of the pure water pipe; and, The first detection part is electrically connected with the controller, and the first detection part is arranged on the pipeline connecting the pure water pipe and the water storage part, and the controller detects the first detection part according to the The result controls the water inlet valve on/off. 7. The water purifier according to claim 6, wherein the water storage part is a pressure tank, the first detection part is a pressure switch, and the controller controls the pressure switch according to the detection result of the pressure switch. ON/OFF of the pressure switch described above. 8. The water purifier according to claim 6, wherein the water storage part is a water bag, the water purifier further comprises a water pump, and the water inlet end of the water pump communicates with the water storage part, The water outlet is communicated with the external water outlet. 9. The water purifier according to claim 8, characterized in that, the water purifier further comprises a second detection part electrically connected to the controller, and the second detection part is arranged on the water pump and the external Between the water outlets; the controller controls the on/off of the water pump according to the detection result of the second detection element. 10. The water purifier according to claim 9, wherein the water purifier further comprises a flow limiting valve electrically connected to the controller, and the flow limiting valve is arranged in parallel with the water pump; The controller controls the opening/closing of the flow limiting valve according to the detection result of the second detecting element. 11. A water purification system, characterized in that the water purification system comprises the water purifier according to any one of claims 1-10.