Water purification equipment and control method thereof

Abstract

The invention provides water purification equipment and a control method thereof, and belongs to the technical field of water purification equipment. The water purification equipment comprises a filtering unit and a backflow unit; the filter unit comprises a reverse osmosis filter element, and the reverse osmosis filter element is used for filtering and outputting pure water; the backflow unit comprises a water storage tank and a first backflow pipe section, the water inlet end of the water storage tank is communicated with the pure water end of the reverse osmosis filter element, the water inlet end of the first backflow pipe section is communicated with the water outlet end of the water storage tank, and the water outlet end of the first backflow pipe section is communicated with the water inlet end of the reverse osmosis filter element. By means of the backflow unit, it is guaranteed that the water inlet end and the pure water end of the reverse osmosis filter element and the interior of the reverse osmosis filter element are all pure water, the situation that residual concentrated water gradually forwards permeates to the pure water side through a reverse osmosis membrane is effectively avoided, it is guaranteed that first-section water is pure water with TDS meeting the requirement, the drinking requirement of a user is met, and the water using experience of the user is improved.

Description

Technical Field

[0001] This invention belongs to the field of water purification equipment technology, specifically relating to a water purification device and its control method. Background Technology

[0002] As people's requirements for drinking water quality increase, water purification equipment is gradually entering people's lives. Reverse osmosis filter cartridges can effectively filter impurities in water, and the filtered pure water can be drunk directly by users. Reverse osmosis filter cartridges are commonly used in water purification equipment.

[0003] However, reverse osmosis (RO) filter cartridges have a problem: they filter out pure water and concentrated water. When the filter cartridge is in standby mode, the residual concentrated water inside will gradually permeate through the RO membrane to the pure water side, causing stagnant water to form on the pure water side. This leads to a gradual increase in the TDS value of the pure water end of the RO filter cartridge. When users take pure water, the high TDS of the initial pure water fails to meet their pure water requirements, affecting the user experience. Summary of the Invention

[0004] In view of the problems existing in the prior art, the primary objective of this invention is to provide a water purification device. The technical problem to be solved by this invention is: how to ensure zero stagnant water, ensure that the TDS value of the first stage of pure water meets the requirements, and improve the user's water experience.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A water purification device, comprising: A filtration unit, the filtration unit including a reverse osmosis filter element, the reverse osmosis filter element being used to filter and output pure water; The reflux unit includes a water storage tank and a first reflux pipe section. The inlet end of the water storage tank is connected to the pure water end of the reverse osmosis filter element. The inlet end of the first reflux pipe section is connected to the outlet end of the water storage tank. The outlet end of the first reflux pipe section is connected to the inlet end of the reverse osmosis filter element.

[0006] In the aforementioned water purification device, the water purification device further includes a water inlet unit and a first water outlet unit; the water inlet unit includes a water inlet pipe section, the water inlet end of the water inlet pipe section is connected to an external device, and the water outlet end of the water inlet pipe section is connected to the water inlet end of the reverse osmosis filter element. The filtration unit also includes a pre-filter, a first connecting pipe section, a post-filter, and a second connecting pipe section. The inlet end of the pre-filter is connected to the outlet end of the inlet pipe section, the inlet end of the first connecting pipe section is connected to the outlet end of the pre-filter, and the outlet end of the first connecting pipe section is connected to the inlet end of the reverse osmosis filter. The outlet end of the first return pipe section is connected to the first connecting pipe section; The inlet end of the second connecting pipe section is connected to the outlet end of the water storage tank, the outlet end of the second connecting pipe section is connected to the inlet end of the post-filter element, and the inlet end of the first outlet unit is connected to the outlet end of the post-filter element.

[0007] In the aforementioned water purification device, the filtration unit further includes a filter valve and a booster pump; The filter valve and the booster pump are sequentially installed on the first connecting pipe section, and the outlet of the first return pipe section is located between the filter valve and the booster pump.

[0008] In the aforementioned water purification device, the filtration unit further includes a wastewater pipe section, a wastewater valve, and a first detection element; The inlet end of the wastewater pipe section is connected to the wastewater end of the reverse osmosis filter element, and the first detection element and the wastewater valve are sequentially installed on the wastewater pipe section.

[0009] In the aforementioned water purification device, the reflux unit further includes a first reflux valve and a first check valve; The first reflux valve and the first check valve are sequentially installed on the first reflux pipe section, with the first reflux valve located between the water inlet end of the second connecting pipe section and the first check valve.

[0010] In the aforementioned water purification device, the first water outlet unit includes a first water outlet pipe section, a second detection element, and a first water outlet valve; The inlet end of the first outlet pipe section is connected to the outlet end of the post-filter element, and the second detection element and the first outlet valve are sequentially arranged on the first outlet pipe section.

[0011] In the aforementioned water purification device, the filtration unit further includes a second return pipe section, a second return valve, and a second check valve; The inlet end of the second reflux pipe section is connected to the wastewater pipe section, and the outlet end of the second reflux pipe section is connected to the first connecting pipe section; the inlet end of the second reflux pipe section is located between the wastewater end of the reverse osmosis filter element and the first detection element, and the outlet end of the second reflux pipe section is located between the filter valve and the booster pump; the second reflux valve and the second check valve are sequentially arranged on the second reflux pipe section.

[0012] In the aforementioned water purification device, the water purification device further includes a second water outlet unit, which includes a second water outlet pipe section, a second water outlet valve, a flow regulating valve, and a sterilization module; The inlet end of the second outlet pipe section is connected to the first connecting pipe section, and the inlet end of the second outlet pipe section is located between the outlet end of the pre-filter and the filter valve. The second outlet valve, flow regulating valve, and sterilization module are located between the second outlet pipe sections.

[0013] In the aforementioned water purification equipment, the water purification equipment further includes a sterilization unit, which includes a sterilization pipe section and a three-way valve; The three-way valve is installed on the second water outlet pipe section, and the three-way valve is located behind the sterilization module; The inlet end of the sterilization pipe section is connected to the three-way valve, and the outlet end of the sterilization pipe section is connected to the inlet end of the post-filter cartridge.

[0014] The second objective of this invention is to provide a control method for a water purification device: A control method for a water purification device, applicable to the aforementioned water purification device, the control method comprising the following steps: When the water purification equipment is in the first state, the control water inlet unit stops water intake, opens the first backflow valve, starts the booster pump, pumps the water in the storage tank to the first connecting pipe section, and pushes it to the reverse osmosis filter element for filtration. Close the second return valve and open the wastewater valve to discharge the wastewater produced by the reverse osmosis filter through the wastewater pipe section. The pure water produced by the reverse osmosis filter enters the water storage tank. When the water inlet device is in the second state, control the water inlet unit to enter the water, close the first backflow valve, start the booster pump, and push the water input from the water inlet unit to the reverse osmosis filter element; Open the second return valve and close the wastewater valve. The wastewater produced by the reverse osmosis filter element flows back to the first connecting pipe section through the second return pipe section. The pure water produced by the reverse osmosis filter element enters the water storage tank. After the water storage tank is full of pure water, close the second reflux valve, open the wastewater valve, and the first water outlet unit will output pure water.

[0015] The beneficial effects of this invention are: The water purification device of this invention, through a reflux unit, ensures that the inlet and pure water ends of the reverse osmosis filter element, as well as the inside of the reverse osmosis filter element, are all pure water. This effectively prevents residual concentrated water from gradually permeating into the pure water side through the reverse osmosis membrane. When the user takes water again, zero stagnant water is guaranteed, ensuring that the first batch of water is pure water with TDS meeting the requirements, satisfying the user's drinking requirements, and improving the user's water experience.

[0016] This invention, through a control method for water purification equipment, ensures that the inlet and outlet of the reverse osmosis filter element, as well as the water inside the reverse osmosis filter element, are all pure water, guaranteeing zero stagnant water and ensuring that the first stage of water is pure water with TDS meeting the requirements, thus satisfying the user's drinking needs. Attached Figure Description

[0017] Figure 1 A schematic diagram of the water circuit when the return unit of the water purification equipment is working; Figure 2 A schematic diagram of the water circuit when the water purification equipment outputs pure water; Figure 3 A schematic diagram of the water circuit when the water purification equipment outputs domestic water; Figure 4 A schematic diagram of the water circuit when the sterilization unit of a water purification system is working; Figure 5 This is a schematic diagram of the water circuit when the pipeline unit of the water purification equipment is working.

[0018] In the diagram, 10 is the inlet water unit; 101 is the inlet water pipe section; 20 is the filtration unit; 201 is the reverse osmosis filter element; 202 is the pre-filter element; 203 is the first connecting pipe section; 204 is the post-filter element; 205 is the second connecting pipe section; 206 is the filter valve; 207 is the booster pump; 208 is the wastewater pipe section; 209 is the wastewater valve; 210 is the first detection element; 211 is the second return pipe section; 212 is the second return valve; 213 is the second check valve; 214 is the transition pipe section; 215 is the third return pipe section; 216 is the third return valve; 217 is the third check valve; 30 is the return unit; and 301 is the reflux unit. Water storage tank; 302, first reflux pipe section; 303, first reflux valve; 304, first check valve; 40, first water outlet unit; 401, first water outlet pipe section; 402, second detection element; 403, first water outlet valve; 50, second water outlet unit; 501, second water outlet pipe section; 502, second water outlet valve; 503, flow regulating valve; 504, sterilization module; 60, sterilization unit; 601, sterilization pipe section; 602, three-way valve; 70, water outlet element; 80, pipeline machine unit; 801, pipeline machine; 802, third water outlet pipe section; 803, high-pressure switch; 804, fourth check valve. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0020] In the description of the embodiments, it should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0021] In the description of the embodiments, it should be noted that when a component / part is referred to as being "set on" another component / part, it can be directly set on the other component / part or there may be an intervening component / part. When a component / part is referred to as being "connected / joined" to another component / part, it can be directly connected / joined to the other component / part or there may be an intervening component / part. The term "connected / joined" as used herein can include mechanical physical connections / joinings. The term "comprising / including" as used herein refers to the presence of a feature, step, or component / part, but does not exclude the presence or addition of one or more other features, steps, or components / parts. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0022] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of this application. Furthermore, in the description of this application, the terms "first," "second," etc., are used for descriptive purposes and to distinguish similar objects only; there is no order between them, nor should they be construed as indicating or implying relative importance. Additionally, in the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0023] Example 1: like Figure 1 and 2 As shown, this embodiment provides a water purification device, including a filtration unit 20 and a reflux unit 30; the filtration unit 20 includes a reverse osmosis filter element 201, which is used to filter and output pure water; the reflux unit 30 includes a water storage tank 301 and a first reflux pipe section 302, the inlet end of the water storage tank 301 is connected to the pure water end of the reverse osmosis filter element 201, the inlet end of the first reflux pipe section 302 is connected to the outlet end of the water storage tank 301, and the outlet end of the first reflux pipe section 302 is connected to the inlet end of the reverse osmosis filter element 201.

[0024] Understandably, the water inlet unit 10 of this water purification equipment takes in tap water, which is filtered by the reverse osmosis filter element 201 and then outputs pure water. The pure water can be supplied to users for direct drinking, or it can be connected to heating or cooling equipment to output hot or cold water to meet different drinking needs of users. In this embodiment, the reflux unit 30 includes a water storage tank 301 and a first reflux pipe section 302. The inlet end of the water storage tank 301 is connected to the pure water end of the reverse osmosis filter element 201. The inlet end of the first reflux pipe section 302 is connected to the outlet end of the water storage tank 301, and the outlet end of the first reflux pipe section 302 is connected to the inlet end of the reverse osmosis filter element 201. When the water purification equipment is in the state where the user has finished taking water, the water intake is stopped, and the water in the water storage tank 301 is pumped to the inlet end of the reverse osmosis filter element 201 through the first reflux pipe section 302. The tap water remaining in the filtration unit 20 and the water pumped from the water storage tank 301 to the filtration unit 20 both pass through the reverse osmosis filter element 201. 01. Filtration is performed, and wastewater is discharged through the wastewater end of the reverse osmosis filter element 201. The filtered pure water enters the storage tank 301. This process is repeated, ensuring that both the inlet and outlet of the reverse osmosis filter element 201 contain pure water, and the filter element 201 itself contains pure water without any concentrated water with high TDS. The storage tank 301 also contains pure water. When the user needs water again, tap water is input into the reverse osmosis filter element 201, and the filtered pure water is output from the outlet and fed into the storage tank 301, filling it to the brim. This ensures that the storage tank 301 contains pure water with TDS that meets the requirements. The pure water in the storage tank 301 is then output for the user's use. The reflux unit 30 ensures that the inlet and pure water ends of the reverse osmosis filter element 201, as well as the water inside the filter element 201, are all pure water. This effectively prevents residual concentrated water from gradually permeating into the pure water side through the reverse osmosis membrane. When the user draws water again, zero stagnant water is guaranteed, ensuring that the first batch of water is pure water with TDS meeting the requirements, satisfying the user's drinking needs and improving the user's water experience. As one embodiment, the inlet end of the first reflux pipe section 302 and the outlet end of the water storage tank 301 are connected by a transition pipe section 214.

[0025] like Figure 1 and 2 As shown, the water purification equipment also includes an inlet unit 10 and a first outlet unit 40; the inlet unit 10 includes an inlet pipe section 101, the inlet end of the inlet pipe section 101 is connected to an external device, and the outlet end of the inlet pipe section 101 is connected to the inlet end of the reverse osmosis filter element 201.

[0026] In this embodiment, the water inlet unit 10 includes a water inlet pipe section 101. The water inlet end of the water inlet pipe section 101 is connected to an external device, which can be a tap water supply device that supplies tap water into the water inlet pipe section 101. The water outlet end of the water inlet pipe section 101 is connected to the water inlet end of the reverse osmosis filter element 201. After the external device supplies tap water into the water inlet pipe section 101, it is transported to the reverse osmosis filter element 201 through the water inlet pipe section 101. The reverse osmosis filter element 201 then filters the tap water, outputting pure water at the pure water end of the reverse osmosis filter element 201 and discharging wastewater at the wastewater end of the reverse osmosis filter element 201. As one embodiment, an inlet valve can be installed on the inlet pipe section 101. The inlet valve can be a solenoid valve. The water purification equipment can be controlled by the inlet valve. When the inlet valve is open, tap water can enter the inlet pipe section 101 and the water purification equipment will work. When the inlet valve is closed, tap water cannot enter the inlet pipe section 101 and the water purification equipment will not work. This makes it convenient to control the opening and closing of the inlet pipe section 101.

[0027] like Figure 1 and 2 As shown, the filtration unit 20 further includes a pre-filter element 202 and a first connecting pipe section 203; the inlet end of the pre-filter element 202 is connected to the outlet end of the inlet pipe section 101, the inlet end of the first connecting pipe section 203 is connected to the outlet end of the pre-filter element 202, and the outlet end of the first connecting pipe section 203 is connected to the inlet end of the reverse osmosis filter element 201; the outlet end of the first return pipe section 302 is connected to the first connecting pipe section 203.

[0028] In this embodiment, the inlet end of the pre-filter 202 is connected to the outlet end of the inlet pipe section 101, and the inlet end of the first connecting pipe section 203 is connected to the outlet end of the pre-filter 202. Tap water enters the pre-filter 202 for filtration through the inlet pipe section 101. The water filtered by the pre-filter 202 is domestic water. The domestic water enters the first connecting pipe section 203. As one embodiment, the first connecting pipe section 203 can be connected to an outlet pipe, and the domestic water can be used by the user for washing, such as washing fruits and vegetables, dishes, etc. Preferably, the pre-filter 202 can be a PPC filter. The outlet end of the first connecting pipe section 203 is connected to the inlet end of the reverse osmosis filter 201. The domestic water filtered by the pre-filter 202 enters the reverse osmosis filter 201 through the first connecting pipe section 203 to form pure water. The outlet of the first return pipe section 302 is connected to the first connecting pipe section 203. After the user finishes taking water, the inlet unit 10 is closed, and the pure water in the storage tank 301 flows back to the first connecting pipe section 203 through the first return pipe section 302. The domestic water in the first connecting pipe section 203 and the pure water flowing back through the first return pipe section 302 enter the reverse osmosis filter element 201 for filtration. The pure water in the storage tank 301 continues to enter the first connecting pipe section 203 so that the first connecting pipe section 203 is filled with pure water. The inside of the reverse osmosis filter element 201 and the pure water section are also filled with pure water. In this way, it can effectively prevent concentrated water from seeping into the pure water end when the water purification equipment is in standby mode, thereby avoiding the problem of high TDS of the first water when the user takes water again.

[0029] like Figure 1 and 2 As shown, the filtration unit 20 further includes a post-filter element 204 and a second connecting pipe section 205; the inlet end of the second connecting pipe section 205 is connected to the outlet end of the water storage tank 301, the outlet end of the second connecting pipe section 205 is connected to the inlet end of the post-filter element 204, and the inlet end of the first water outlet unit 40 is connected to the outlet end of the post-filter element 204.

[0030] In this embodiment, the post-filter 204 is a PPC filter; the inlet end of the second connecting pipe section 205 is connected to the outlet end of the water storage tank 301, and the outlet end of the second connecting pipe section 205 is connected to the inlet end of the post-filter 204. The inlet end of the first water outlet unit 40 is connected to the outlet end of the post-filter 204. When pure water needs to be prepared, tap water enters the pre-filter 202 from the inlet pipe section 101. The tap water is filtered by the pre-filter 202 to form domestic water, and then enters the first connecting pipe section 203. Through the first connecting pipe section 203, it enters the reverse osmosis filter 201. After being filtered by the reverse osmosis filter 201, pure water is formed and enters the water storage tank 301. Then, through the water storage tank 301, it enters the post-filter 204 to complete the preparation of pure water. Finally, it enters the first water outlet unit 40, and pure water is output through the first water outlet unit 40. In this embodiment, further filtration through the post-filter 204 can further optimize the taste of the water and ensure drinking water safety.

[0031] like Figure 1 and 2 As shown, the filtration unit 20 further includes a filter valve 206 and a booster pump 207; the filter valve 206 and the booster pump 207 are sequentially arranged on the first connecting pipe section 203, and the outlet end of the first return pipe section 302 is located between the filter valve 206 and the booster pump 207.

[0032] In this embodiment, the filter valve 206 and the booster pump 207 are sequentially arranged on the first connecting pipe section 203. The filter valve 206 is located near the inlet end of the first connecting pipe section 203, and the booster pump 207 is located near the outlet end of the first connecting pipe section 203. When pure water needs to be prepared, the filter valve 206 is opened, and the booster pump 207 is started. The booster pump 207 works to pump the domestic water filtered by the pre-filter 202 to the reverse osmosis filter 201 and the post-filter 204 for filtration to prepare pure water. As one embodiment, the filter valve 206 is a solenoid valve, which facilitates the control of the opening and closing of the first connecting pipe section 203.

[0033] like Figure 1 and 2 As shown, the filtration unit 20 also includes a wastewater pipe section 208, a wastewater valve 209, and a first detection element 210; the inlet end of the wastewater pipe section 208 is connected to the wastewater end of the reverse osmosis filter element 201, and the first detection element 210 and the wastewater valve 209 are sequentially arranged on the wastewater pipe section 208.

[0034] Understandably, the domestic water filtered by the pre-filter 202 enters the reverse osmosis filter 201. While filtering out pure water, the reverse osmosis filter 201 generates wastewater, which is discharged from the wastewater end of the reverse osmosis filter 201. In this embodiment, the inlet end of the wastewater pipe section 208 is connected to the wastewater end of the reverse osmosis filter 201, and the outlet end of the wastewater pipe section 208 can be directly connected to the sewer to discharge the wastewater generated by the reverse osmosis filter 201. The wastewater valve 209 and the first detection element 210 are sequentially installed in the wastewater pipe section 208. The first detection element 210 is a TDS probe that can detect the medium TDS value of the discharged wastewater. When the TDS value of the wastewater is detected to be low, the wastewater valve 209 is closed, and a pipeline is connected to the first connecting pipe section 203 before the booster pump to return the water with the low TDS value. This effectively reduces water waste.

[0035] like Figure 1 and 2 As shown, the reflux unit 30 further includes a first reflux valve 303 and a first check valve 304; the first reflux valve 303 and the first check valve 304 are sequentially disposed on the first reflux pipe section 302, and the first reflux valve 303 is located between the water inlet end of the second connecting pipe section 205 and the first check valve 304.

[0036] In this embodiment, the first reflux valve 303 and the first one-way valve 304 are sequentially installed on the first reflux pipe section 302. When it is necessary to reflux the pure water in the water storage tank 301 back into the first connecting pipe section 203, the first reflux valve 303 is opened, and the booster pump 207 draws the pure water in the water storage tank 301 into the first reflux pipe section 302, and then into the first connecting pipe section 203 through the first reflux pipe section 302. The first one-way valve 304 can effectively prevent domestic water in the first pipe section from flowing back into the water storage tank 301 through the first reflux pipe section 302, thus avoiding contamination of the pure water in the water storage tank 301. When it is necessary to prepare pure water, the first reflux valve 303 is closed, and the pure water in the water storage tank 301 can enter the post-filter 204 through the second connecting pipe section 205, and then enter the first water outlet unit 40 through the post-filter 204, and is output by the first water outlet unit 40 for users to drink. As one embodiment, the first return valve 303 is a solenoid valve, which facilitates the control of the opening and closing of the first return pipe section 302.

[0037] like Figure 1 and 2 As shown, the first water outlet unit 40 includes a first water outlet pipe section 401, a second detection element 402, and a first water outlet valve 403; the water inlet end of the first water outlet pipe section 401 is connected to the water outlet end of the post-filter element 204, and the second detection element 402 and the first water outlet valve 403 are sequentially arranged on the first water outlet pipe section 401.

[0038] In this embodiment, the inlet end of the first water outlet pipe section 401 is connected to the outlet end of the post-filter cartridge 204. The purified water filtered by the post-filter cartridge 204 enters the first water outlet pipe section 401 and is then output from the first water outlet pipe section 401 for user use. As one embodiment, the outlet end of the first water outlet pipe section 401 is equipped with a water outlet component 70, which can be a faucet, allowing purified water to be supplied to the user. Alternatively, the outlet end of the first water outlet pipe section 401 can also be connected to a heating or cooling device. After the purified water passes through the second pipe section into the heating or cooling device, it is heated or cooled, thus outputting hot or cold water to meet different user needs. The second detection element 402 and the first water outlet valve 403 are sequentially installed on the first water outlet pipe section 401. The second detection element 402 can be a TDS probe to detect the TDS concentration of pure water. The first water outlet valve 403 can be a solenoid valve to control the opening and closing of the first water outlet pipe section 401, that is, to control the output of pure water through the first water outlet valve 403.

[0039] like Figure 1 and 2 As shown, the filtration unit 20 further includes a second reflux pipe section 211, a second reflux valve 212, and a second check valve 213; the inlet end of the second reflux pipe section 211 is connected to the wastewater pipe section 208, and the outlet end of the second reflux pipe section 211 is connected to the first connecting pipe section 203; the inlet end of the second reflux pipe section 211 is located between the wastewater end of the reverse osmosis filter element 201 and the first detection element 210, and the outlet end of the second reflux pipe section 211 is located between the filter valve 206 and the booster pump 207; the second reflux valve 212 and the second check valve 213 are sequentially arranged on the second reflux pipe section 211.

[0040] In this embodiment, after the user finishes taking water, the water inlet unit 10 is closed, and the pure water in the water storage tank 301 flows back to the first connecting pipe section 203 through the first return pipe section 302. The domestic water in the first connecting pipe section 203 and the pure water flowing back through the first return pipe section 302 enter the reverse osmosis filter element 201 for filtration. Pure water continuously enters the first connecting pipe section 203 from the water storage tank 301, so that the water in the first connecting pipe section 203, the inside of the reverse osmosis filter element 201, and the pure water section are all pure water, avoiding the infiltration of concentrated water. When the user takes water again... When the water inlet unit 10 is opened, tap water passes through the pre-filter 202 and enters the first connecting pipe section 203. Since both the first connecting pipe section 203 and the reverse osmosis filter 201 initially contain pure water, the pure water entering the reverse osmosis filter 201 will still generate wastewater. This wastewater has a low TDS (Total Dissolved Solids). Therefore, by opening the second return valve 212, the booster pump 207 draws this low-TDS water back into the first connecting pipe section 203 through the second return pipe section 211, effectively avoiding water waste. As one embodiment, the second return valve 212 is a solenoid valve, facilitating the control of the opening and closing of the second return pipe section 211.

[0041] like Figure 1 and 2 As shown in the illustration, in one embodiment, the filtration unit 20 further includes a third return pipe section 215, a third return valve 216, and a third check valve 217. The inlet end of the third return pipe section 215 is connected to the first outlet unit 40, and the outlet end of the third return pipe section 215 is connected to the inlet unit 10. The third return valve 216 and the third check valve 217 are sequentially arranged on the third return pipe section. When the user uses the water purifier again, since the inlet end of the third return pipe section 215 is connected to the first outlet unit 40, and the outlet end of the third return pipe section 215 is connected to the inlet unit 10, the first batch of water can be returned to the inlet unit 10 through the third return pipe section 215. After being filtered by the pre-filter 202, the reverse osmosis filter 201, and the post-filter 204, the problem of high TDS in the first cup of water when the water purifier is reused can be further solved, ensuring zero stagnant water and guaranteeing the user's water safety. In addition, a third return valve 216 is installed on the third return pipe section 215. The third return valve 216 can be a solenoid valve. The third return valve 216 is used to open and close the third return pipe section 215 to control the return of stale water. A third check valve 217 is installed on the third return pipe section 215. The third check valve 217 controls the direction of water flow on the third return pipe section 215. That is, stale water can only flow to the water inlet unit 10 through the third return pipe section 215 and cannot flow in the opposite direction to avoid mixing of stale water and pure water, thereby preventing the output pure water TDS from being too high.

[0042] like Figure 3As shown, the water purification equipment further includes a second water outlet unit 50, which includes a second water outlet pipe section 501, a second water outlet valve 502, a flow regulating valve 503, and a sterilization module 504. The water inlet end of the second water outlet pipe section 501 is connected to the first connecting pipe section 203, and the water inlet end of the second water outlet pipe section 501 is located between the water outlet end of the pre-filter 202 and the filter valve 206. The second water outlet valve 502, the flow regulating valve 503, and the sterilization module 504 are disposed between the second water outlet pipe section 501.

[0043] In this embodiment, the inlet end of the second outlet pipe section 501 is connected to the first connecting pipe section 203, and the inlet end of the second outlet pipe section 501 is located between the outlet end of the pre-filter 202 and the filter valve 206. Tap water enters the pre-filter 202 for filtration through the inlet pipe section 101. The water filtered by the pre-filter 202 is domestic water. When the user needs to use domestic water, the filter valve 206 is closed, and the domestic water enters the second outlet pipe section 501 through the first connecting pipe section 203. The outlet end of the second outlet pipe section 501 can be equipped with an outlet component 70. Furthermore, the outlet component 70 is a faucet, and the domestic water is output through the faucet for the user's use. The sterilization module 504 is installed on the second water outlet section 501. When domestic water needs to be output, tap water is filtered through the pre-filter 202 and enters the second water outlet section 501. At this time, the sterilization module 504 prepares sterilizing substances for the flowing domestic water. In other words, the output domestic water contains sterilizing substances to give it a sterilization function. When fruits and vegetables need to be washed, the domestic water containing sterilizing substances rinses and soaks the fruits and vegetables. The sterilizing substances further disinfect bacteria on the surface of the fruits and vegetables, ensuring that the fruits and vegetables are clean and free of pesticide and bacterial residues, thus ensuring the user's food safety. As one embodiment, the sterilization module 504 is an electrolytic sterilization module 504, which utilizes the principle of electrolysis to generate sterilizing substances. For example, ozone and hydroxyl radicals are generated through electrolysis between electrodes in water, or hypochlorous acid is formed through electrolysis and hydrolysis. The sterilization module 504 electrolyzes the flowing tap water to ensure that the tap water contains one of the sterilizing substances, namely ozone, hydroxyl radicals, or hypochlorous acid. Of course, the tap water may also contain multiple sterilizing substances, depending on the actual situation, and is not limited here. In addition, the flow regulating valve 503 is installed on the second water outlet pipe section 501. The flow regulating valve 503 can be used to regulate the flow rate of water in the second water outlet pipe section 501 to regulate the concentration of sterilizing substances in the output tap water, so as to ensure that the concentration of sterilizing substances is suitable and avoids that the concentration of sterilizing substances in the output domestic water is too high, resulting in a strong taste, or too low, resulting in an insignificant sterilization effect. The second water outlet valve 502 is a solenoid valve, which can control the opening and closing of the second water outlet pipe section 501.

[0044] like Figure 4As shown, the water purification equipment also includes a sterilization unit 60, which includes a sterilization pipe section 601 and a three-way valve 602. The three-way valve 602 is installed on the second outlet pipe section 501 and is located behind the sterilization module 504. The inlet end of the sterilization pipe section 601 is connected to the three-way valve 602, and the outlet end of the sterilization pipe section 601 is connected to the inlet end of the post-filter 204.

[0045] It is understandable that bacteria will grow in the first water outlet unit 40 under prolonged use of the water purification equipment, thus requiring regular sterilization. In this embodiment, the three-way valve 602 is installed on the second water outlet pipe section 501, and the three-way valve 602 is located behind the sterilization module 504. The inlet end of the sterilization pipe section 601 is connected to the three-way valve 602, and the outlet end of the sterilization pipe section 601 is connected to the second connecting pipe section 205. Thus, tap water is filtered by the pre-filter 202 to form domestic water, which flows into the second water outlet pipe section 501 and then through the sterilization module 504. The sterilization module 504 electrolyzes to generate sterilizing substances. To impart bactericidal substances to the drinking water, the three-way valve 602 closes the outlet of the second outlet pipe section 501 and opens the outlet of the sterilization pipe section 601. This allows the bactericidal drinking water to enter the sterilization pipe section 601, then the second connecting pipe section 205, and finally the post-filter 204. The post-filter 204 then enters the first outlet unit 40, thus sterilizing and disinfecting the first outlet unit 40. As an example, when the outlet of the first outlet unit 40 is connected to heating or cooling equipment, the bactericidal drinking water can also sterilize the heating or cooling equipment, improving the safety of the user's drinking water. It should be noted that, to prevent the bactericidal substances from entering the reverse osmosis filter element 201 and thus avoid damaging it, the outlet of the sterilization pipe section 601 is connected to the inlet of the post-filter element 204. This prevents the bactericidal substances from entering the reverse osmosis filter element 201 and protects it. Furthermore, the flow control valve is located upstream of the sterilization module 504. When it is necessary to control the concentration of the bactericidal substances in the domestic water, the flow control valve is adjusted, thereby regulating the flow rate of domestic water through the sterilization module 504. This prevents the bactericidal substance concentration from being too low, resulting in an insignificant sterilization effect on the first water outlet unit 40, or from being too high, causing a strong odor and affecting the drinking quality of the purified water.

[0046] like Figure 1-5As shown in the illustration, in one embodiment, the water purification device further includes a water outlet component 70, where the water outlet ends of the first water outlet unit 40 and the second water outlet unit 50 are both located within the water outlet component 70. The water outlet component 70 can be a faucet, integrating the outlets for both domestic water and purified water, allowing for the output of different types of water with a single faucet. Of course, when the outlet end of the first water outlet unit 40 is connected to a heating or cooling device, the outlet ends of both devices can also be integrated into the faucet, enabling the faucet to output domestic water, room temperature purified water, hot purified water, and cold purified water, thus greatly improving convenience.

[0047] like Figure 5 As shown in the figure, in one embodiment, the water purification equipment also includes a pipeline machine unit 80. The pipeline machine unit 80 includes a pipeline machine 801, a third outlet pipe section 802, and a high-pressure switch 803. The inlet end of the third outlet pipe section 802 is connected to the first outlet pipe section 401 and is located between the second detection element 402 and the first outlet valve 403. The outlet end of the third outlet pipe section 802 is connected to the pipeline machine 801. The high-pressure switch 803 is disposed on the third outlet pipe section 802. The water dispenser 801 controls the on / off state of the third outlet pipe section 802 via a high-pressure switch 803. When the water dispenser 801 is turned on, a pressure difference exists between the front and rear ends of the high-pressure switch 803, causing the switch to open and the third outlet pipe section 802 to connect. Pure water flows from the first outlet pipe section 401 into the third outlet pipe section 802 and is finally output from the water dispenser 801, thus enabling the water dispenser 801 to take water. A fourth one-way valve 804 is also installed on the third outlet pipe section 802 to control the direction of water flow, ensuring that water can only flow into the water dispenser 801 and not in the opposite direction. Of course, when sterilization of the water dispenser unit 80 is required, domestic water containing sterilizing substances enters the first outlet pipe section 401 and then flows through the first outlet pipe section 401 into the third outlet pipe section 802, thereby sterilizing the water dispenser unit 80 and ensuring its sterile state, thus guaranteeing the user's water safety.

[0048] Example 2: This embodiment provides a control method for a water purification device, applicable to the water purification device of Embodiment 1. The control method includes the following steps: S100: When the water purification equipment is in the first state, the control water inlet unit 10 stops water intake, opens the first reflux valve 303, starts the booster pump 207, pumps the water in the water storage tank 301 to the first connecting pipe section 203, and pushes it to the reverse osmosis filter element 201 for filtration.

[0049] Specifically, the first state is the state when the user has just finished taking water. At this time, the water inlet unit 10 is stopped from taking water, that is, no domestic water enters the first connecting pipe section 203. The first return valve 303 is opened and the booster pump 207 is started. The booster pump 207 pumps the pure water in the water storage tank 301 into the first connecting pipe section 203. The booster pump 207 continuously pushes the water in the first connecting pipe section 203 into the reverse osmosis filter element 201 so that the water in the first connecting pipe section 203 is pure water.

[0050] S200: Close the second reflux valve 212, open the wastewater valve 209, and discharge the wastewater produced by the reverse osmosis filter element 201 through the wastewater pipe section 208. The pure water produced after filtration by the reverse osmosis filter element 201 enters the water storage tank 301.

[0051] Specifically, the booster pump 207 continuously pushes the pure water in the first connecting pipe section 203 into the reverse osmosis filter element 201. The wastewater generated by the reverse osmosis filter element 201 is discharged through the wastewater pipe section 208. The pure water produced after filtration by the reverse osmosis filter element 201 enters the water storage tank 301. In this way, the first connecting pipe section 203, the reverse osmosis membrane, and the pure water end of the reverse osmosis filter element 201 are all pure water, effectively preventing concentrated water from seeping into the pure water section through the reverse osmosis filter element 201 and preventing the problem of high TDS in the first stage of the water purification equipment.

[0052] S300: When the water inlet device is in the second state, control the water inlet unit 10 to enter the water, close the first return valve 303, start the booster pump 207, and push the water input from the water inlet unit 10 to the reverse osmosis filter element 201.

[0053] Specifically, the second state is the state where the user takes water again. The water inlet unit 10 is controlled to input tap water, the first return valve 303 is closed, the booster pump 207 is started, the tap water enters the pre-filter 202 for filtration through the water inlet pipe section 101, and the domestic water produced after filtration by the pre-filter 202 enters the first connecting pipe section 203. The booster pump 207 continuously pushes the domestic water into the reverse osmosis filter 201 for filtration.

[0054] S400: Open the second reflux valve 212 and close the wastewater valve 209. The wastewater produced by the reverse osmosis filter element 201 is returned to the first connecting pipe section 203 through the second reflux pipe section 211. The pure water produced by the reverse osmosis filter element 201 enters the water storage tank 301.

[0055] Specifically, since the initial stage contains pure water in the first connecting pipe section 203 and the reverse osmosis filter element 201, the pure water entering the reverse osmosis filter element 201 will also generate wastewater. This wastewater is water with a low TDS. Therefore, by controlling the opening of the second return valve 212, the booster pump 207 draws out the water with a low TDS so that this part of the water flows back to the first connecting pipe section 203 through the second return pipe section 211. The pure water filtered by the reverse osmosis filter enters the water storage tank 301. In this way, water waste is effectively avoided.

[0056] S500: After the water storage tank 301 is full of pure water, close the second reflux valve 212, open the wastewater valve 209, and the first water outlet unit 40 outputs pure water.

[0057] Specifically, the pure water filtered by the reverse osmosis filter element 201 first fills the water storage tank 301. After the water storage tank 301 is full, the second return valve 212 is closed and the wastewater valve 209 is opened. Tap water enters the pre-filter element 202 for filtration through the inlet pipe section 101. The domestic water produced after filtration by the pre-filter element 202 enters the first connecting pipe section 203 and then enters the reverse osmosis filter element 201 for filtration through the first connecting pipe section 203. The wastewater after filtration by the reverse osmosis filter element 201 is discharged normally through the wastewater pipe section 208. The pure water after filtration by the reverse osmosis filter element 201 enters the water storage tank 301 and is then continuously output for users to drink through the first water outlet unit 40.

[0058] The control method of the water purification equipment in this embodiment ensures that the inlet and pure water ends of the reverse osmosis filter element 201, as well as the water inside the reverse osmosis filter element 201, are all pure water. This effectively prevents residual concentrated water from gradually permeating to the pure water side through the reverse osmosis membrane. When the user takes water again, zero stagnant water is guaranteed, ensuring that the first batch of water is pure water with TDS meeting the requirements, thus meeting the user's drinking requirements and improving the user's water experience.

[0059] The above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the present invention, and all such modifications and substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A water purification device, characterized in that, include: The filtration unit (20) includes a reverse osmosis filter element (201) for filtering and outputting pure water; The reflux unit (30) includes a water storage tank (301) and a first reflux pipe section (302). The inlet end of the water storage tank (301) is connected to the pure water end of the reverse osmosis filter element (201). The inlet end of the first reflux pipe section (302) is connected to the outlet end of the water storage tank (301). The outlet end of the first reflux pipe section (302) is connected to the inlet end of the reverse osmosis filter element (201).

2. The water purification equipment according to claim 1, characterized in that, The water purification equipment also includes an inlet unit (10) and a first outlet unit (40); the inlet unit (10) includes an inlet pipe section (101), the inlet end of the inlet pipe section (101) is connected to an external device, and the outlet end of the inlet pipe section (101) is connected to the inlet end of the reverse osmosis filter element (201). The filter unit (20) further includes a pre-filter (202), a first connecting pipe section (203), a post-filter (204), and a second connecting pipe section (205); The inlet end of the pre-filter (202) is connected to the outlet end of the inlet pipe section (101), the inlet end of the first connecting pipe section (203) is connected to the outlet end of the pre-filter (202), and the outlet end of the first connecting pipe section (203) is connected to the inlet end of the reverse osmosis filter (201). The outlet end of the first return pipe section (302) is connected to the first connecting pipe section (203); The inlet end of the second connecting pipe section (205) is connected to the outlet end of the water storage tank (301), the outlet end of the second connecting pipe section (205) is connected to the inlet end of the post filter element (204), and the inlet end of the first water outlet unit (40) is connected to the outlet end of the post filter element (204).

3. The water purification equipment according to claim 2, characterized in that, The filter unit (20) also includes a filter valve (206) and a booster pump (207). The filter valve (206) and the booster pump (207) are sequentially arranged on the first connecting pipe section (203), and the outlet of the first return pipe section (302) is located between the filter valve (206) and the booster pump (207).

4. The water purification equipment according to claim 3, characterized in that, The filtration unit (20) also includes a wastewater pipe section (208), a wastewater valve (209), and a first detection element (210). The inlet end of the wastewater pipe section (208) is connected to the wastewater end of the reverse osmosis filter element (201), and the first detection element (210) and the wastewater valve (209) are sequentially installed on the wastewater pipe section (208).

5. The water purification equipment according to claim 2, characterized in that, The reflux unit (30) further includes a first reflux valve (303) and a first check valve (304); The first reflux valve (303) and the first check valve (304) are sequentially disposed on the first reflux pipe section (302), with the first reflux valve (303) located between the water inlet end of the second connecting pipe section (205) and the first check valve (304).

6. The water purification equipment according to claim 2 or 5, characterized in that, The first water outlet unit (40) includes a first water outlet pipe section (401), a second detection element (402), and a first water outlet valve (403). The inlet end of the first outlet pipe section (401) is connected to the outlet end of the post-filter element (204), and the second detection element (402) and the first outlet valve (403) are sequentially arranged on the first outlet pipe section (401).

7. The water purification equipment according to claim 4, characterized in that, The filter unit (20) also includes a second return pipe section (211), a second return valve (212), and a second check valve (213). The inlet end of the second return pipe section (211) is connected to the wastewater pipe section (208), and the outlet end of the second return pipe section (211) is connected to the first connecting pipe section (203); the inlet end of the second return pipe section (211) is located between the wastewater end of the reverse osmosis filter element (201) and the first detection element (210), and the outlet end of the second return pipe section (211) is located between the filter valve (206) and the booster pump (207); the second return valve (212) and the second check valve (213) are sequentially arranged on the second return pipe section (211).

8. The water purification equipment according to claim 3, characterized in that, The water purification equipment also includes a second water outlet unit (50), which includes a second water outlet pipe section (501), a second water outlet valve (502), a flow regulating valve (503), and a sterilization module (504). The inlet end of the second outlet pipe section (501) is connected to the first connecting pipe section (203), and the inlet end of the second outlet pipe section (501) is located between the outlet end of the pre-filter (202) and the filter valve (206). The second outlet valve (502), the flow regulating valve (503), and the sterilization module (504) are located between the second outlet pipe section (501).

9. The water purification equipment according to claim 8, characterized in that, The water purification equipment also includes a sterilization unit (60), which includes a sterilization pipe section (601) and a three-way valve (602). The three-way valve (602) is installed on the second water outlet pipe section (501), and the three-way valve (602) is located behind the sterilization module (504); The inlet end of the sterilization pipe section (601) is connected to the three-way valve (602), and the outlet end of the sterilization pipe section (601) is connected to the inlet end of the post-filter (204).

10. A control method for a water purification device, characterized in that, The control method, applicable to any one of claims 1-9, comprises the following steps: When the water purification equipment is in the first state, the control water inlet unit (10) stops water inlet, opens the first return valve (303), starts the booster pump (207), pumps the water in the water storage tank (301) to the first connecting pipe section (203), and pushes it to the reverse osmosis filter element (201) for filtration; Close the second return valve (212), open the wastewater valve (209), and discharge the wastewater produced by the reverse osmosis filter element (201) through the wastewater pipe section (208). The pure water produced after filtration by the reverse osmosis filter element (201) enters the water storage tank (301). When the water inlet device is in the second state, control the water inlet unit (10) to inlet water, close the first return valve (303), start the booster pump (207), and push the water input from the water inlet unit (10) to the reverse osmosis filter element (201). Open the second return valve (212) and close the wastewater valve (209). The wastewater produced by the reverse osmosis filter element (201) is returned to the first connecting pipe section (203) through the second return pipe section (211). The pure water produced by the reverse osmosis filter element (201) enters the water storage tank (301). After the water storage tank (301) is full of pure water, close the second reflux valve (212), open the wastewater valve (209), and the first water outlet unit (40) outputs pure water.

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