Drainage device and system for controlling discharging of concentrated water in water purification process

Provided is a drainage device and a system for controlling discharging of concentrated water in a water purification process. The device includes a valve cavity, a flowmeter, a transmission shaft and a control unit. The control unit is used for controlling a motion of the transmission shaft to adjust a liquid flow of the flowmeter in the valve cavity. The device inhibits an instantaneous impact of a liquid on the valve cavity to relieve vibration generated by the instantaneous impact; a special structural design is employed, which is favorable for controlling a flow of the concentrated water; moreover, the device is suitable for different pressure environments, achieves the objectives of small volume, controllable fitting area and small friction force; prevents leakage, and is easy to maintain and clean; and abnormal discharging of the concentrated water caused by water hammer and liquid impact in a water purification system is solved.

TECHNICAL FIELD

The present application relates to the field of water purification, and more particularly, to a drainage device and a system for controlling discharging of concentrated water in a water purification process.

BACKGROUND

According to a traditional water purification system adopting a reverse osmosis membrane, a booster pump is used as power of the water purification system. When a fixed discharge ratio of concentrated water is used, due to a physical characteristic of the membrane, a recovery rate of purified water is decreased with the decrease of a water temperature, and the discharge ratio of the concentrated water is gradually increased, resulting in a large amount of waste of water resources. When an adjustable flow of the concentrated water is used, a discharge of the concentrated water is mainly adjusted by a valve. This method belongs to human intervention, and can only achieve simple fuzzy adjustment, but can not achieve precise control, which will either cause waste of purified water or unqualified purified water. At present, the water purification system, which adjusts the discharging of the concentrated water by automatic control, has a single control mode and great limitations, and belongs to a primary stage of controllable discharging.

For the water purification system adopting an ultra-low pressure membrane, the water purification system is driven by a tap water pressure. Since a tap water pressure of each household is quite different, different or unstable water pressure environments of a water purifier easily lead to an unstable water production rate of the membrane and an unstable water quality after recovery.

Meanwhile, in actual application, due to a design of the water purification system or an inlet water source, water in the water purification system contains gas or bubbles, and the persistent gas or bubbles are discharged from a concentrated water valve, generating water hammer and liquid hammer, so that a valve core of a concentrated water valve is worn and a jitter noise is generated, resulting in an abnormal discharge of the concentrated water over time.

SUMMARY

The present application provides a drainage device and a system for controlling discharging of concentrated water in a water purification process to solve a problem of abnormal discharging of the concentrated water caused by water hammer and liquid impact in a water purification system.

In order to solve the above technical problem, the present application provides the following technical solutions.

The present application provides the drainage device, which includes a valve cavity, a flowmeter, a transmission shaft, and a control unit, wherein:

an inner cavity wall of the valve cavity is provided with an inner shoulder, and the inner shoulder divides the inner cavity of the valve cavity into a first cavity and a second cavity which are communicated;

the first cavity is provided with a first water inlet hole penetrating through the cavity wall;

the second cavity is provided with a first water outlet hole penetrating through the cavity wall and a first shaft hole, and the first shaft hole is a cylindrical hole, and arranged on an opposite face of a communication port between the first cavity and the second cavity;

the flowmeter is arranged in a space formed by the first cavity and the second cavity, and includes a first cylinder, a first baffle, a first flow hole, and a second flow hole;

the first baffle forms an outer shoulder of the flowmeter; and the outer shoulder is matched, and hermetically, movably and fixedly connected with the inner shoulder of the first cavity;

the first cylinder penetrates through the first baffle, an inner cavity of the first cylinder is in a cylindrical shape, and the cylindrical shape is coaxial with the first shaft hole; the first cylinder includes a first portion and a second portion; the first portion extends into the first cavity, and a side wall of the first portion is provided with a through first flow hole; and the second portion extends into the second cavity, an opening of the second portion faces the first shaft hole, and a side wall of the second portion is provided with a through second flow hole; and

the transmission shaft is a cylinder, which passes through the first shaft hole and the first cylinder, and is hermetically and movably connected with the first shaft hole and the first cylinder, one end of the transmission shaft entering the first cylinder is provided with a diversion portion, and the other end of the transmission shaft extending from the first shaft hole outside the valve cavity is matched with the control unit to control a motion of the transmission shaft, so that the diversion portion is matched with the first flow hole and the second flow hole to control a liquid flow, so as to divert the liquid from the first cavity to the second cavity.

Preferably, the diversion portion is a flow through hole passing through the transmission shaft; the flow through hole includes a first diversion port and a second diversion port which are arranged in an outer wall of the transmission shaft; the first diversion port is matched with the first flow hole, and a liquid flow flowing from the flowmeter into the flow through hole is controlled by the motion of the transmission shaft; and the second diversion port is matched with the second flow hole to divert the liquid from the flow through hole to the second cavity.

Preferably, the flow through hole is a straight hole.

Preferably, the diversion portion is a flow channel; and the flow channel is matched with the first flow hole and the second flow hole through the motion of the transmission shaft to control a liquid flow entering the flow channel from the first flow hole, and divert the liquid from the flow channel to the second cavity through the second flow hole.

Preferably, a notch of the flow channel is gradually widened from the first flow hole to the second flow hole.

Preferably, the first flow hole is an isosceles triangular hole.

Preferably, the control unit controls an axial motion of the transmission shaft, and a bottom face of the isosceles triangular hole is perpendicular to an axis of the inner cavity of the first cylinder.

Preferably, the control unit controls a circumferential motion of the transmission shaft, and a bottom face of the isosceles triangular hole is parallel to an axis of the inner cavity of the first cylinder.

Preferably, a vertex angle of the isosceles triangle is an acute angle.

Preferably, the flowmeter further includes a second cylinder which is sleeved outside the first cylinder, one end of the second cylinder is hermetically and fixedly connected with the first baffle, and the other end of the second cylinder is opened and faces the inner wall of the first cavity, and is provided with a first water inlet hole penetrating through a side wall of the second cylinder.

Preferably, the first water inlet hole is arranged in a cylinder wall of the second cylinder far away from the first flow hole.

Preferably, an outer side wall of the second cylinder is movably connected with the inner wall of the first cavity.

Preferably, the opening of the second cylinder extends to a vicinity of the inner wall of the first cavity.

Preferably, the second cylinder further includes a plurality of splitter plates; and

the splitter plates are fixedly connected with the inner wall of the second cylinder and used for slowing down a flow rate of the liquid flowing into the flowmeter.

Preferably, an inner cavity of the second cylinder is in a cylindrical shape, and the splitter plates are evenly distributed along an axis of the cylindrical shape and are perpendicular to the inner wall of the second cylinder.

Preferably, the first flow hole is arranged between extended planes formed by two splitter plates; and the first water inlet hole is arranged between two splitter plates.

Preferably, a cavity wall of the first cavity opposite to an opening end of the second cylinder is a second baffle; and the second baffle plate is hermetically, movably and fixedly connected with the first cavity.

Preferably, the second cavity further includes a gas accommodation portion for collecting gas in the second cavity and discharging the gas from the first water outlet hole.

The present application provides the system for controlling discharging of concentrated water in the water purification process, wherein the system at least includes the drainage device according to any one of claims1to18, and a processor, a pressure gauge, a water purifier, a first switch, and a water delivery pipeline;

the control unit at least includes a transmission gear and a first motor;

the transmission gear is provided with a coaxial transmission through hole, the transmission through hole is movably connected with the transmission shaft, and an outer edge of the transmission gear is provided with first gear teeth;

the first motor is in signal connection with the processor, a driving rod of the first motor is provided with a driving gear, gear teeth of the driving gear are connected with the first gear teeth, and the first motor drives the driving gear to drive the transmission gear to rotate, so that the transmission shaft moves;

the water purifier at least includes a reverse osmosis membrane or an ultra-low pressure reverse osmosis membrane, a water inlet of the water purifier is used for inputting raw water, a first water outlet of the water purifier is used for outputting purified water, and a second water outlet of the water purifier is connected with the first water inlet hole of the drainage device for outputting concentrated water;

the pressure gauge is in signal connection with the processor, arranged in the first cavity, and used for collecting pressure information in the first cavity and transmitting the pressure information to the processor;

the first switch is in signal connection with the processor, arranged in the water delivery pipeline, and used for controlling the water purifier to produce water; and

the processor is used for acquiring a water production signal; acquiring first information according to the water production signal and transmitting opening information to the first switch, wherein the first information includes pressure information; and according to the first information and a preset control rule, driving the first motor to control the transmission shaft to move, so as to achieve a preset purified water discharge ratio of the concentrated water.

Preferably, the system further includes a first TDS measuring device, wherein the first TDS measuring device is in signal connection with the processor, arranged in the water delivery pipeline in front of the water purifier, and used for collecting first TDS information and transmitting the first TDS information to the processor; and

the first information further comprises the first TDS information.

Preferably, the system further includes a second TDS measuring device, wherein the first information further includes second TDS information; and

the second TDS measuring device is in signal connection with the processor, arranged in the water delivery pipeline behind the water purifier, and used for collecting the second TDS information and transmitting the second TDS information to the processor.

Preferably, one end of the transmission shaft extending out of the valve cavity from the first shaft hole is provided with an external thread; the transmission through hole is provided with an internal thread in threaded connection with the external thread of the transmission shaft; and the first motor drives the driving gear to drive the transmission gear to rotate, so that the transmission shaft moves axially.

Preferably, one end of the transmission shaft extending out of the valve cavity from the first shaft hole is provided with an external gear; the transmission through hole is provided with an internal gear in threaded connection with the external gear of the transmission shaft; and the first motor drives the driving gear to drive the transmission gear to rotate, so that the transmission shaft moves circumferentially.

Preferably, two sides of the transmission gear are provided with bearings.

Preferably, the pressure gauge includes a pressure switch device.

It can be known from the disclosures of the above embodiments that the embodiments of the present application have the following beneficial effects.

The present application provides the drainage device and the system for controlling discharging of concentrated water in the water purification process, the drainage device includes the valve cavity, the flowmeter, the transmission shaft, and the control unit; the inner cavity wall of the valve cavity is provided with the inner shoulder, and the inner shoulder divides the inner cavity of the valve cavity into the first cavity and the second cavity which are communicated; the first cavity is provided with the first water inlet hole penetrating through the cavity wall; the second cavity is provided with the first water outlet hole penetrating through the cavity wall and the first shaft hole, and the first shaft hole is the cylindrical hole, and arranged on the opposite face of the communication port between the first cavity and the second cavity; the flowmeter is arranged in the space formed by the first cavity and the second cavity, and includes the first cylinder, the first baffle, the first flow hole, and the second flow hole; the first baffle forms the outer shoulder of the flowmeter; the outer shoulder is matched, and hermetically, movably and fixedly connected with the inner shoulder of the first cavity; the first cylinder penetrates through the first baffle, the inner cavity of the first cylinder is in the cylindrical shape, and the cylindrical shape is coaxial with the first shaft hole; the first cylinder includes the first portion and the second portion; the first portion extends into the first cavity, and the side wall of the first portion is provided with the through first flow hole; the second portion extends into the second cavity, the opening of the second portion faces the first shaft hole, and the side wall of the second portion is provided with the through second flow hole; the transmission shaft is the cylinder, which passes through the first shaft hole and the first cylinder, and is hermetically and movably connected with the first shaft hole and the first cylinder, one end of the transmission shaft entering the first cylinder is provided with the diversion portion, and the other end of the transmission shaft extending from the first shaft hole outside the valve cavity is matched with the control unit to control the motion of the transmission shaft, so that the diversion portion is matched with the first flow hole and the second flow hole to control the liquid flow, so as to divert the liquid from the first cavity to the second cavity.

According to the device of the present application, an instantaneous impact of the liquid on the valve cavity is inhibited to relieve vibration generated by the instantaneous impact; a special structural design is employed, which is favorable for controlling a flow of the concentrated water; moreover, the device is suitable for different pressure environments, achieves the objectives of small volume, controllable fitting area and small friction force; prevents leakage, and is easy to maintain and clean; and a problem of abnormal discharging of the concentrated water caused by water hammer and liquid impact in the water purification system is solved.

REFERENCE NUMERALS

1refers to first cavity,2refers to second cavity,3refers to flowmeter,4refers to transmission shaft,5refers to transmission gear,6refers to first motor,7refers to drainage device,8refers to pressure gauge,9refers to water purifier,10refers to first TDS measuring device,11refers to second TDS measuring device,12refers to water delivery pipeline,13refers to first switch,14refers to valve cavity,15refers to bearing, and16refers to control unit;

101refers to first water inlet hole,102refers to inner shoulder, and103refers to second baffle;

201refers to first water outlet hole,202refers to first shaft hole, and203refers to gas accommodation portion;

301refers to first cylinder,302refers to first baffle,303refers to second cylinder,304refers to first water inlet hole,305refers to first flow hole,306refers to second flow hole, and307refers to splitter plate;

3011refers to first portion, and3012refers to second portion;

4011refers to flow through hole,4012refers to first diversion port,4013refers to second diversion port, and4014refers to flow channel;

501refers to transmission through hole, and502refers to first gear teeth; and

601refers to drive gear.

DETAILED DESCRIPTION

The specific embodiments of the present application are described in detail hereinafter with reference to the accompanying drawings, which are not used for limiting the present application.

It is to be understood that various modifications can be made to the embodiments disclosed herein. Therefore, the above specification should not be regarded as a limitation, but only as the examples of the embodiments. Those skilled in the art will think of other modifications within the scope and spirit of the present application.

The accompanying drawings included in and constitute a part of the specification illustrate the embodiments of the present application and, are used for explaining the principles of the present application with the general description of the present application given above and the detailed description of the embodiments given below.

These and other characteristics of the present application will become apparent from the following description of preferred forms of embodiments given as non-limiting examples with reference to the accompanying drawings.

It should also be understood that although the present application has been described with reference to some specific examples, those skilled in the art can certainly realize many other equivalent forms of the present application, which have the features in the claims and are therefore all within the scope of protection defined herein.

The above and other aspects, features and advantages of the present application will become more apparent in view of the following detailed description with reference to the accompanying drawings.

The specific embodiments of the present application are described hereinafter with reference to the accompanying drawings. However, it is to be understood that the disclosed embodiments are only examples of the present application, which can be implemented in various ways. Well-known and/or repetitive functions and structures are described in detail to avoid obscuring the present application by unnecessary or redundant details. Therefore, the specific structural and functional details disclosed herein are not intended to limit, but only used as the basis and representative basis of the claims for teaching those skilled in the art to variously use the present application in any suitable detailed structure virtually.

The specification may use the phrases “in an embodiment”, “in another embodiment”, “in yet another embodiment” or “in other embodiments”, which may all refer to one or more of the same or different embodiments according to the present application.

The present application provides a drainage device and a system for controlling discharging of concentrated water in a water purification process. The drainage device and the system are described in detail in the following embodiments one by one.

The first embodiment is provided for the present application, which is namely the embodiment of the drainage device.

The embodiment is described in detail hereinafter with reference toFIG. 1toFIG. 7.

With reference toFIG. 1toFIG. 2, the embodiment provides a drainage device, which includes a valve cavity14, a flowmeter3, a transmission shaft4, and a control unit16.

An inner cavity wall of the valve cavity14is provided with an inner shoulder102, and the inner shoulder102divides the inner cavity of the valve cavity14into a first cavity1and a second cavity2which are communicated.

The first cavity1is provided with a first water inlet hole101penetrating through the cavity wall.

The first water inlet hole101is used for being connected with a water purifier9and introducing concentrated water discharged from the water purifier9into the first cavity1.

The second cavity2is provided with a first water outlet hole201penetrating through the cavity wall and a first shaft hole202, and the first shaft hole202is a cylindrical hole, and arranged on an opposite face of a communication port between the first cavity1and the second cavity2.

The first water outlet hole201is used for discharging concentrated water entering the second cavity2out of the second cavity2.

Preferably, the second cavity2further includes a gas accommodation portion203for collecting gas in the second cavity2and discharging the gas from the first water outlet hole201.

The water purification system cannot avoid intrusion of flowing gas or bubbles in water sources and the water purification system on the system in actual work. Since most of the persistent gas or bubbles in the water purification system may generally enter the first cavity1and then enter the second cavity2, design of the gas accommodation portion203aims to smoothly discharge the gas from the second cavity2, thus avoiding an influence of the gas on the discharging of the concentrated water.

Preferably, the gas accommodation portion203is a gas accommodation ring, which is a groove arranged on an inner wall of the second cavity2, and the first water outlet hole201is located in the groove.

With reference toFIG. 3, the flowmeter3is arranged in a space formed by the first cavity1and the second cavity2, and includes a first cylinder301, a first baffle302, a first flow hole305, and a second flow hole306.

The first baffle302forms an outer shoulder3021of the flowmeter3; and the outer shoulder3021is matched, and hermetically, movably and fixedly connected with the inner shoulder102of the first cavity1, so that the flowmeter3may be taken out of the valve cavity14when cleaning. Meanwhile, in order to prevent the concentrated water from flowing from the first cavity1into the second cavity2through a gap between the outer shoulder3021and the inner shoulder102, in the embodiment, the outer shoulder3021is hermetically connected with the inner shoulder102to isolate a high-pressure area from a low-pressure area. For example, a silica gel ring or a rubber ring is employed between the outer shoulder3021and the inner shoulder102.

The first cylinder201penetrates through the first baffle302, an inner cavity of the first cylinder is in a cylindrical shape, and the cylindrical shape is coaxial with the first shaft hole202. The first cylinder301includes a first portion3041and a second portion3042. The first portion3041extends into the first cavity1, and a side wall of the first portion is provided with a through first flow hole305. The second portion3042extends into the second cavity2, an opening of the second portion faces the first shaft hole202, and a side wall of the second portion is provided with a through second flow hole306.

The first flow hole305is an isosceles triangular hole. The isosceles triangle is gradually enlarged from a vertex angle to a bottom edge, which is beneficial for controlling a flow of the concentrated water. Certainly, those skilled in the art may also control the flow step by step through other triangles, which is not limited in the present application.

Preferably, the vertex angle of the isosceles triangle is an acute angle.

The transmission shaft4is a cylinder, which passes through the first shaft hole202and the first cylinder301, and is hermetically and movably connected with the first shaft hole202and the first cylinder301, one end of the transmission shaft entering the first cylinder301is provided with a diversion portion401, and the other end of the transmission shaft extending from the first shaft hole202outside the valve cavity14is matched with the control unit16to control a motion of the transmission shaft4, so that the diversion portion401is matched with the first flow hole305and the second flow hole306to control a liquid flow, so as to divert the liquid from the first cavity1to the second cavity2.

The transmission shaft4is hermetically and movably connected with the first shaft hole202to avoid leakage of the concentrated water and damage to an external device. For example, the transmission shaft4and the first shaft hole202are sealed by oil seal.

Due to an excessively large distance between an inlet and an outlet of the diversion portion401, a sufficient fitting area exists between the diversion portion401and the flowmeter3, so that leakage caused by insufficient fitting and sealing due to an increased pressure will not occur.

Preferably, the control unit16controls a circumferential motion of the transmission shaft4, and a bottom face of the isosceles triangular hole of the first flow hole305is parallel to an axis of the inner cavity of the first cylinder301.

Preferably, the control unit16controls an axial motion of the transmission shaft4, and a bottom face of the isosceles triangular hole of the first flow hole305is perpendicular to an axis of the inner cavity of the first cylinder301.

A traditional faucet valve core adjusts the flow by adjusting openings of two fitted ceramic discs. For a pressurized reverse osmosis membrane water purification system, a fitting pressure and a contact area of the two fitted discs must be increased to ensure adaptation to different pressure environments, which will inevitably lead to a huge volume of a valve core and an increased friction resistance. The drainage device in the embodiment adapts to different pressure environments, and achieves the purposes of small volume, controllable fitting area, and small friction force.

A part of the transmission shaft4entering the valve cavity14and the flowmeter3may be made of corrosion-resistant and wear-resistant ceramic materials.

The diversion portion401is a flow through hole4011passing through the transmission shaft4. The flow through hole4011includes a first diversion port4012and a second diversion port4013which are arranged in an outer wall of the transmission shaft4. The first diversion port4012is matched with the first flow hole305, and a liquid flow flowing from the flowmeter3into the flow through hole4011is controlled by the motion of the transmission shaft4. The second diversion port4013is matched with the second flow hole306to divert the liquid from the flow through hole4011to the second cavity2.

The motion of the transmission shaft4includes an axial motion or a circumferential motion.

With reference toFIG. 6, preferably, the flow through hole4011is a straight hole.

With reference toFIG. 7, preferably, the diversion portion401is a flow channel4014. The flow channel4014is matched with the first flow hole305and the second flow hole306through the motion of the transmission shaft4to control a liquid flow entering the flow channel4014from the first flow hole305, and divert the liquid from the flow channel4014to the second cavity2through the second flow hole306.

Preferably, a notch of the flow channel4014is gradually widened from the first flow hole305to the second flow hole306, so that a flow of the concentrated water entering the flow channel4014is conveniently controlled.

With reference toFIG. 4, the flowmeter3further includes a second cylinder303, which is sleeved outside the first cylinder301, one end of the second cylinder is hermetically and fixedly connected with the first baffle302, and the other end of the second cylinder is opened and faces the inner wall of the first cavity1, and is provided with a first water inlet hole304penetrating through a side wall of the second cylinder.

Preferably, a cavity wall of the first cavity1opposite to an opening end of the second cylinder303is a second baffle103; and the second baffle plate103is hermetically, movably and fixedly connected with the first cavity1.

The first cavity1is a first device into which the concentrated water flows. Compared with raw water, highly concentrated water is more destructive to mechanical parts, especially has a corrosion effect on metal parts. In addition, the highly concentrated water is easy to form sediment and scale, especially has wearing damage to transmission parts, such as a confidential transmission thread, and bearings15. Design of the second baffle103aims to facilitate cleaning and maintenance of parts in the first cavity1.

Preferably, the first water inlet hole304is arranged in a cylinder wall of the second cylinder303far away from the first flow hole305.

An outer side wall of the second cylinder303is movably connected with the inner wall of the first cavity1, so that the parts in the first cavity1are cleaned and maintained conveniently, and the flowmeter3is also replaced conveniently.

The opening of the second cylinder303extends to a vicinity of the inner wall of the first cavity1.

Most of persistent gas or bubbles in a water purification process may generally enter the first cavity1. Due to an internal structure of the cavity, a mutually repulsive force with a pressure of the liquid in the cavity may be formed, and at the moment when the gas is discharged, the liquid may knock, causing liquid hammer on the parts in the valve cavity14. Especially when the drainage device7is dynamically adjusted, this phenomenon is more obvious.

With reference toFIG. 5, preferably, the second cylinder303further includes a plurality of splitter plates307.

The splitter plates307are fixedly connected with the inner wall of the second cylinder303and used for slowing down a flow rate of the liquid flowing into the flowmeter3.

The splitter plates307are used for dividing a liquid-gas mixture into several parts to slow down a flow rate into the diversion portion401, so that the liquid-gas mixture may not interfere normal flow adjustment after being isolated, thus inhibiting an instantaneous impact of the liquid on the valve cavity14, and slowing down vibration caused by the liquid.

Preferably, an inner cavity of the second cylinder303is in a cylindrical shape; and the splitter plates307are evenly distributed along an axis of the cylindrical shape and are perpendicular to the inner wall of the second cylinder303.

Preferably, the first flow hole305is arranged between extended planes formed by two splitter plates307; and the first water inlet hole304is arranged between two splitter plates307.

Corresponding to the first embodiment of the present application, the present application further provides the second embodiment, which is namely a system for controlling discharging of concentrated water in a water purification process. Since the second embodiment is basically similar to the first embodiment, the description is relatively simple. The relevant parts refer to the corresponding description of the first embodiment. The device embodiment described below is only exemplary. The embodiment is described in detail hereinafter with reference toFIG. 1,FIG. 2, andFIG. 8.

With reference toFIG. 8, the embodiment provides the system for controlling discharging of concentrated water in the water purification process. The system at least includes the drainage device7according to the first embodiment, and a processor, a pressure gauge8, a water purifier9, a first switch13, and a water delivery pipeline12.

With reference toFIG. 1andFIG. 2, in the first embodiment, the control unit16at least includes a transmission gear5and a first motor6.

The transmission gear5is provided with a coaxial transmission through hole501, the transmission through hole501is movably connected with the transmission shaft4, and an outer edge of the transmission gear5is provided with first gear teeth502.

The transmission gear5may be made of metal or ceramic.

The transmission shaft4may be displaced in a small range by displacing the transmission gear5in a large range, thus implementing precise control.

The first motor6is in signal connection with the processor, a driving rod of the first motor is provided with a driving gear601, gear teeth of the driving gear601are connected with the first gear teeth502, and the first motor6drives the driving gear601to drive the transmission gear5to rotate, so that the transmission shaft4moves.

A gap exists between the transmission shaft4and the transmission gear5, especially when the first motor6drives the transmission gear5to rotate forward and backward, it is easy to cause moving, wearing, and noise among the parts.

Preferably, two sides of the transmission gear5are provided with bearings15.

A shaking problem caused by a mutual motion among the first motor6, the transmission gear5, and the transmission shaft4is solved through the bearings15, thus reducing a working resistance of the first motor6and prolonging a service life of the first motor.

In the case of insufficient circumferential operation and repeated operation within a certain angle range, neither the bearings15nor the first motor6is inevitable from local wearing, resulting in transmission irregularity or eccentricity.

Preferably, a radius of the transmission gear5is much greater than that of the transmission shaft4, so that the first motor6may drive the transmission gear5to work with a very small force, and the first motor6has a wider application range and a smaller working torque, thus having a longer service life.

Meanwhile, since the radius of the transmission gear5is much greater than that of the transmission shaft4, a circumferential displacement of the transmission gear5in each cycle of rotation is greater than that of the transmission shaft4or the bearings15, so that the first motor6, the transmission gear5, and the bearings15may be fully operated during working, thus ensuring that the first motor6, the transmission gear5, and the bearings15are evenly stressed, and avoiding eccentricity. A service life of the bearings15may also be prolonged.

Arrangement of the transmission shaft4in the embodiment avoids axial deviation and shaking of the transmission shaft4caused by working of the first motor6.

The embodiment avoids direct contact between the transmission system and the concentrated water.

The embodiment solves impact jamming of the drainage device7caused by resistance or vibration in different pressure and water flow environments, so that the drainage device7is operated smoothly.

The water purifier9at least includes a reverse osmosis membrane or an ultra-low pressure reverse osmosis membrane, a water inlet of the water purifier is used for inputting raw water, a first water outlet of the water purifier is used for outputting purified water, and a second water outlet of the water purifier is connected with the first water inlet hole of the drainage device for outputting the concentrated water.

The pressure gauge8is in signal connection with the processor, arranged in the first cavity1, and used for collecting pressure information in the first cavity1and transmitting the pressure information to the processor;

Since impurities in the concentrated water are generally heavier than those in water, the impurities are easy to accumulate on a bottom of the first cavity1. In order to prevent the impurities from affecting a pressure measurement accuracy, preferably, the pressure gauge8is arranged on a top of the first cavity1.

Preferably, the pressure gauge8includes a pressure switch device.

The pressure switch device is in signal connection with the processor and used for transmitting pressure information to the processor when a collected pressure signal is within a preset pressure range.

Preferably, three pressure gauges8are arranged in the first cavity1, and the pressure gauges8are distributed in a triangular shape.

The processor drives the drainage device7to work in a corresponding working mode according to the pressure information.

The first switch13is in signal connection with the processor, arranged in the water delivery pipeline12, and used for controlling the water purifier9to produce water. When the first switch13is turned on, the system starts to produce purified water, and when the first switch13is turned off, the system stops producing the purified water.

The processor is used for acquiring a water production signal; acquiring first information according to the water production signal and transmitting opening information to the first switch13, wherein the first information includes pressure information; and according to the first information and a preset control rule, driving the first motor6to control the transmission shaft4to move, so as to achieve a preset purified water discharge ratio of the concentrated water.

The system further includes a first TDS measuring device10, wherein the first TDS measuring device is in signal connection with the processor, arranged in the water delivery pipeline12in front of the water purifier9, and used for collecting first TDS information and transmitting the first TDS information to the processor. The first information further includes the first TDS information.

The first TDS information is often used as a basis for the processor to control the discharging of the concentrated water.

The system further includes a second TDS measuring device11, wherein the first information further includes second TDS information.

The second TDS measuring device11is in signal connection with the processor, arranged in the water delivery pipeline12behind the water purifier9, and used for collecting the second TDS information and transmitting the second TDS information to the processor.

As a discharging effect of the concentrated water, the second TDS information is used as a basis for the processor to control the discharging of the concentrated water.

One end of the transmission shaft4extending out of the valve cavity14from the first shaft hole202is provided with an external thread. The transmission through hole501is provided with an internal thread in threaded connection with the external thread of the transmission shaft. The first motor6drives the driving gear601to drive the transmission gear5to rotate, so that the transmission shaft4moves axially.

One end of the transmission shaft4extending out of the valve cavity14from the first shaft hole202is provided with an external gear. The transmission through hole501is provided with an internal gear in threaded connection with the external gear of the transmission shaft4. The first motor6drives the driving gear601to drive the transmission gear5to rotate, so that the transmission shaft4moves circumferentially.

The external thread or the external gear may be processed by a metal pipe sleeved on a ceramic rod.

The above embodiments are only exemplary embodiments of the present application, and are not used to limit the present application. The scope of protection of the present application is defined by the claims. Those skilled in the art may make various modifications or equivalent substitutions within the essence and protection scope of the present application, and such modifications or equivalent substitutions should also be regarded as falling within the scope of protection of the present application.