Control method of water purification system

Abstract

The invention discloses a control method of a water purification system. The water purification system comprises a reverse osmosis filter assembly; the raw water pipe is used for inputting raw water into a raw water opening of the reverse osmosis filtering assembly, and the raw water pipe is provided with a raw water inlet valve and a booster pump; the concentrated water pipe is used for discharging concentrated water output from the concentrated water port of the reverse osmosis filtering assembly, and the concentrated water pipe is provided with a concentrated water outlet valve; the normal-temperature water pipe and the hot water pipe are connected in parallel and used for discharging pure water output from the pure water port of the reverse osmosis filtering assembly, the normal-temperature water pipe is provided with a normal-temperature water outlet valve, and the hot water pipe is provided with a flow control pump and a heating pipe; the control method comprises a normal-temperature water taking mode, and in the normal-temperature water taking mode, the flow control pump and the heating pipe are closed, and the raw water inlet valve, the booster pump, the concentrated water outlet valve and the normal-temperature water outlet valve are opened. The control method has the beneficial effects that the control method is optimized, the efficiency is improved, the water consumption is reduced, and the modes are enriched, so that the functions are richer.

Description

Technical Field

[0001] The invention relates to a water purification system and belongs to the technical field of kitchen appliances. Background Art

[0002] The household water purification system is one of the common water treatment equipment in modern households. It is mainly used to remove impurities and harmful substances in tap water, improve water quality, and ensure the safety and health of drinking water. According to different filtration technologies and functional requirements.

[0003] At present, the core component of the water purification system for water purification is the reverse osmosis filtration component, which adopts the reverse osmosis membrane technology. However, the water purification system in the prior art has a relatively complex structural design, especially the complicated layout of the pipeline, which leads to the complex control logic of the whole system, especially when taking hot water and backwashing, and there is also the problem of large water waste. In addition, the control contains fewer modes, making the functionality of the water purification system relatively poor. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a control method for a water purification system, optimize the control method, improve the efficiency and reduce the water consumption, and enrich the modes to make the functions more abundant.

[0005] The present invention is achieved through the following technical solutions.

[0006] A control method for a water purification system, the water purification system comprising:

[0007] A reverse osmosis filtration component, wherein a raw water passage, a pure water passage and a concentrated water passage are provided in the reverse osmosis filter element component; the raw water passage is provided with a reverse osmosis filter element, so that raw water in the reverse osmosis filter element generates pure water entering the pure water passage through a reverse osmosis flow direction, and generates concentrated water entering the concentrated water passage through a raw water flow direction; the volume of the pure water passage is variable and is proportional to the pure water pressure in the pure water passage;

[0008] A raw water pipe, used to input raw water into the raw water inlet of the reverse osmosis filtration component, wherein the raw water pipe is provided with a raw water inlet valve and a booster pump;

[0009] A concentrate water pipe, used for discharging concentrate water outputted from the concentrate water outlet of the reverse osmosis filtration assembly, wherein the concentrate water pipe is provided with a concentrate water outlet valve;

[0010] A normal temperature water pipe and a hot water pipe are arranged in parallel, and are used to discharge the pure water outputted from the pure water outlet of the reverse osmosis filtration assembly, wherein the normal temperature water pipe is provided with a normal temperature water outlet valve, and the hot water pipe is provided with a flow control pump and a heating pipe;

[0011] The control method includes a normal temperature water intake mode. In the normal temperature water intake mode, the flow control pump and the heating tube are turned off, and the raw water inlet valve, the booster pump, the concentrated water outlet valve and the normal temperature outlet valve are turned on.

[0012] As a further improvement of the present invention, the control method also includes a water storage mode, detecting the pure water outlet water pressure of the reverse osmosis filtration component, and starting the water storage mode when the pure water outlet water pressure is lower than a first threshold value. In the water storage mode, the normal temperature outlet valve, the flow control pump and the heating tube are closed, and the raw water inlet valve, the booster pump and the concentrated water outlet valve are opened, so that the volume of the pure water passage gradually increases until the pure water outlet water pressure of the reverse osmosis filtration component reaches a second threshold value.

[0013] As a further improvement of the present invention, the first threshold is set to 0.03-0.07 mPa, and the second threshold is set to 0.2-0.6 mPa.

[0014] As a further improvement of the present invention, the control method also includes a hot water intake mode. In the hot water intake mode, the raw water inlet valve, the booster pump, the concentrated water outlet valve and the normal temperature water inlet valve are closed, and the flow control pump and the heating tube are turned on.

[0015] As a further improvement of the present invention, if the pure water outlet water pressure of the reverse osmosis filtration component in the hot water intake mode is lower than the first threshold, the water storage mode is started.

[0016] As a further improvement of the present invention, a backwash water circuit is provided in the reverse osmosis component, and the backwash water circuit connects the pure water circuit and the raw water circuit, and can be blocked or connected; the control method also includes a backwash mode, and the backwash mode is started when the normal temperature water intake mode is stopped or the pure water outlet water pressure of the reverse osmosis filtration component reaches a second threshold value. In the backwash mode, the raw water inlet valve, the booster pump, the normal temperature water inlet valve, the flow control pump and the heating tube are closed, the concentrated water outlet valve is opened for a seconds and the backwash water circuit is connected, so that the pure water in the pure water circuit flows into the raw water circuit and flushes the reverse osmosis filter element.

[0017] As a further improvement of the present invention, in the backwash mode, the concentrated water outlet valve is opened for 3-10 seconds.

[0018] As a further improvement of the present invention, the water purification system further comprises:

[0019] A pre-filter element, used for pre-filtering the raw water in the raw water pipe;

[0020] A pure water pipe, used to output the pure water produced by the reverse osmosis filtration assembly;

[0021] The post-filter element is used for post-filtering the pure water in the pure water pipe, and delivering the pure water after post-filtration to the normal temperature water pipe and the hot water pipe.

[0022] As a further improvement of the present invention, the pre-filter element and the post-filter element are combined into a composite filter element.

[0023] As a further improvement of the present invention, a pressure sensor is provided on the pure water pipe for detecting the outlet water pressure of the pure water of the reverse osmosis filtration assembly.

[0024] Beneficial effects of the present invention:

[0025] The control method of the present application is based on the product of the optimized essence system structure, which includes a normal temperature water intake mode, a water storage mode, a hot water intake mode and a backwash mode, so that the control method is optimized, the efficiency is improved and the water consumption is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings to help understand the purpose and advantages of the present invention, wherein:

[0027] Figure 1 is a schematic diagram of the reverse osmosis filtration component in implementation case 1;

[0028] Figure 2 It is a schematic diagram of the filter element seat in implementation case 1;

[0029] Figure 3 A schematic diagram of a reverse osmosis filtration assembly with a water holding chamber in implementation case 1;

[0030] Figure 4 A schematic diagram of a reverse osmosis filtration assembly provided with a partition in implementation case 1;

[0031] Figure 5 Schematic diagram of the water purification system in implementation case 2. DETAILED DESCRIPTION

[0032] The present invention is further described in detail below based on the accompanying drawings and implementation examples.

[0033] The directional terms such as up, down, left, right, front, back, front, back, top, bottom, etc. mentioned or may be mentioned in this specification are defined relative to the structures shown in the drawings. The words "inside" and "outside" refer to the direction toward or away from the geometric center of a specific component, respectively. They are relative concepts, and therefore may change accordingly according to different locations and different usage conditions. Therefore, these or other directional terms should not be interpreted as restrictive terms.

[0034] Implementation Case 1:

[0035] A reverse osmosis filter assembly, referring to Figure 1-4 , comprising a filter container 1, the filter container 1 having a raw water inlet h1, a pure water inlet h2 and a concentrated water inlet h3, and the filter container 1 having a raw water passage r1, a pure water passage r2 and a concentrated water passage r3. The raw water passage r1 is connected to the raw water inlet h1, raw water is input into the filter container 1 through the raw water inlet h1, and the raw water flows along the raw water passage r1, the pure water passage r2 is connected to the pure water inlet h2, the pure water in the filter container 1 flows along the pure water passage r2, and is output from the filter container 1 through the pure water inlet h2, the concentrated water passage r3 is connected to the pure water inlet h2, the concentrated water in the filter container 1 flows along the concentrated water passage r3, and is output from the filter container 1 through the concentrated water inlet h3.

[0036] The raw water passage r1 is provided with a reverse osmosis filter element 13, which is also called a RO reverse osmosis water purifier filter element. It utilizes the principle of reverse osmosis technology. When water passes through the reverse osmosis membrane under a certain pressure, water molecules can pass through, while most soluble solids, inorganic salts, organic matter, colloids, bacteria, viruses and other larger molecules and particles cannot pass through, are blocked and discharged with concentrated water, so the reverse osmosis filter element 13 can filter the raw water to form pure water and concentrated water respectively. In this embodiment, the raw water flows through the reverse osmosis filter element 13 to generate pure water entering the pure water passage r2, and flows through the raw water passage r1 to generate concentrated water entering the concentrated water passage r3. In the filter container 1, the pure water passage r2 and the concentrated water passage r3 are equivalent to being connected in parallel with the raw water passage r1.

[0037] In this embodiment, the volume of the pure water passage r2 is variable and is proportional to the pure water pressure in the pure water passage r2. Therefore, the pure water passage r2 of this embodiment can store pure water by increasing the pure water pressure in the pure water passage r2. The most direct effect is that the instantaneous water pressure can be increased when releasing pure water, so that the user can obtain a more objective water output at the moment of taking water.

[0038] In the present embodiment, the pure water passage r2 and the raw water passage r1 are connected with a backwash water passage r4, and the backwash water passage r4 can be blocked or connected. When the backwash water passage r4 is blocked, the pure water flow of the pure water passage r2 and the raw water flow of the raw water passage r1 do not interfere with each other. When the backwash water passage r4 is connected, the pure water of the pure water passage r2 is allowed to flow into the raw water passage r1 through the backwash water passage r4, and the reverse osmosis filter element 13 of the raw water passage r1 is flushed. The flushing action can completely flush and replace the concentrated water in the reverse osmosis filter element 13, so that the reverse osmosis filter element 13 does not contain larger molecules and particles such as solids, inorganic salts, organic matter, colloids, bacteria, viruses, etc., thereby greatly reducing the TDS value of the first cup of water when the user takes water.

[0039] In this embodiment, the backwashing water path r4 is connected to the raw water path r1 at the upstream of the reverse osmosis filter element 13. When backwashing is required, the backwashing water path is connected, and the pure water in the pure water path r2 flows into the raw water path r1 at the upstream of the reverse osmosis filter element 13 through the backwashing water path r4, so that the pure water can flow in from the water inlet end of the reverse osmosis filter element 13 and flow out from the water outlet end, so that the reverse osmosis filter element 13 can be fully covered and flushed, thereby improving the cleanliness of the flushing of the reverse osmosis filter element 13 and avoiding the residual macromolecules and particles in the reverse osmosis filter element 13. In addition, in the prior art, backwashing is performed by returning pure water to the reverse osmosis filter element 13. The reverse osmosis filter element 13 is structurally composed of multiple layers of reverse osmosis membranes. Whether it is raw water filtration or pure water return, water is achieved by penetrating multiple layers of reverse osmosis membranes. During filtration, a large water pressure difference needs to be created to allow the raw water to penetrate these permeation membranes, while it is difficult to provide a large water pressure difference during backwashing, so that the penetration degree of pure water returning to the reverse osmosis filter element 13 is relatively low, and due to the high difficulty of penetration, a large amount of pure water needs to be consumed for reverse osmosis. In the present embodiment, since the pure water is not returned to the reverse osmosis filter element 13, but is introduced upstream of the reverse osmosis filter element 13 through the backwash water path r4, the pure water flushes the reverse osmosis filter element 13 along the original flow direction of the raw water, so that the flow resistance of the pure water for backwashing is greatly reduced compared with the prior art, which not only improves the flushing efficiency and can completely cover the reverse osmosis filter element 13 for flushing, but also greatly reduces the consumption of pure water compared with the prior art.

[0040] In this embodiment, the backwash water path r4 is provided with a one-way valve 16, which limits the flow from the pure water path r2 to the raw water path r1. The one-way valve 16 is set with a pressure difference threshold. When the water pressure difference between the pure water path r2 and the raw water path r1 reaches the pressure difference threshold, the one-way valve 16 opens, and when the water pressure difference between the pure water path r2 and the raw water path r1 does not reach the pressure difference threshold, the one-way valve 16 closes. Usually, when the raw water port h1 stops inputting raw water, the pure water port h2 stops outputting pure water, and the concentrated water port h3 continues to output concentrated water, the water pressure difference between the pure water path r2 and the raw water path r1 can reach the pressure difference threshold, so that the one-way valve 16 opens to enter the backwash state. It should be noted that, in the state of water storage, the pure water path r2 can not only reach the pressure difference threshold to open the one-way valve 16, but also provide sufficient pure water to flow into the raw water path r1 through the backwash water path r4 to flush the reverse osmosis filter element 13, thereby further optimizing the effect and efficiency of backwashing.

[0041] As for the specific structural composition of the filter container 1, in this embodiment, the filter container 1 includes a filter bottle 11 and a filter element seat 12. The filter bottle 11 is a structure with an opening and a hollow interior, the reverse osmosis filter element 13 is arranged in the filter bottle 11, and the filter element seat 12 is installed at the opening of the filter bottle 11, thereby forming a sealed structure with the filter bottle 11. The raw water inlet h1, the pure water inlet h2 and the concentrated water inlet h3 are all arranged on the filter element seat 12. The filter element seat 12 is provided with a raw water pipe 121, a pure water pipe 122 and a concentrated water pipe 123. The raw water pipe 121 is connected to the raw water inlet h1 and constitutes a part of the raw water passage r1. The other part of the raw water passage r1 is located in the filter bottle 11; the pure water pipe 122 is connected to the pure water inlet h2 and constitutes a part of the pure water passage r2. The other part of the pure water passage r2 is located in the filter bottle 11; the concentrated water pipe 123 is connected to the concentrated water inlet h3 and constitutes a part of the concentrated water passage r3. The other part of the concentrated water passage r3 is located in the filter bottle 11.

[0042] In this embodiment, the backwash water circuit r4 is arranged in the filter element seat 12 and connects the pure water pipe 122 and the raw water pipe 121, and the reverse osmosis filter element 13 is arranged in the filter bottle 11, so that the pure water in the backwash water circuit r4 flows into the upstream of the reverse osmosis filter element 13, so that the pure water can flush the reverse osmosis filter element 13.

[0043] In this embodiment, a central tube 14 is provided in the filter bottle 11, and the central tube 14 is located at the center of the filter bottle 11. The tube wall of the central tube 14 has a plurality of water holes 141, which can allow water to flow from the periphery of the central tube 14 into the central tube 14 through the water holes 141. The central tube 14 constitutes another part of the pure water passage r2 and is connected to the pure water pipeline 122. Therefore, the central tube 14 and the pure water pipeline 122 constitute a complete pure water passage r2. The reverse osmosis filter element 13 is annularly sleeved outside the central tube 14. The reverse osmosis filter element 13 constitutes another part of the raw water passage r1 and is connected to the raw water pipeline 121. Therefore, the reverse osmosis filter element 13 and the raw water pipeline 121 constitute a complete raw water passage r1. There is a gap 15 between the reverse osmosis filter element 13 and the inner wall of the filter bottle 11. The gap 15 is annular and constitutes another part of the concentrated water passage r3, and is connected to the concentrated water pipeline 123. Therefore, the annular gap 15 and the concentrated water pipeline 123 constitute a complete concentrated water passage r3.

[0044] In this embodiment, more specifically, the filter element seat 12 is arranged at the top of the filter bottle 11, and the central tube 14 is arranged vertically. The raw water enters from the raw water port h1 and flows downward along the raw water pipe 121 into the reverse osmosis filter element 13. A part of the raw water is reverse osmosis inward in the reverse osmosis filter element 13, and the pure water that has completed the reverse osmosis flows into the central tube 14 through the water hole 141. The pure water flows upward along the central tube 14 and flows into the pure water pipe 122, and is finally output from the pure water port h2. Another part of the raw water in the reverse osmosis filter element 13 forms concentrated water after flowing through the reverse osmosis filter element 13. The concentrated water flows upward along the gap 15 and flows into the concentrated water pipe 123, and is finally output from the concentrated water port h3.

[0045] For the variable volume setting of pure water passage r2, refer to Figure 3 In one embodiment, a water containing chamber 17 is provided in the filter bottle 11, and the water containing chamber 17 is connected to the central tube 14. The volume of the water containing chamber 17 is variable and is proportional to the water pressure of the pure water therein. By providing the water containing chamber 17 with a variable volume, the volume of the pure water passage r2 is variable. When the water pressure increases, the water containing chamber 17 gradually increases, thereby achieving the function of increasing the volume of the pure water channel and storing water.

[0046] More specifically, in this embodiment, the cavity wall of the water containing chamber 17 is a rigid structure, and an elastic diaphragm 171 is arranged in the water containing chamber 17. The elastic diaphragm 171 divides the space of the water containing chamber 17 into two parts, one part of which is connected to the central tube 14, the pure water pipeline 122 and the pure water inlet h2, and this part can change the pure water volume of the water containing chamber 17, and the other part has a compressible medium, and the compressible medium is set to a gas medium. The gas medium can be specifically set to an inert gas such as air or nitrogen. Nitrogen is the best choice. Nitrogen is a gas with very stable chemical properties. It is not easy to react chemically with other substances and has good stability during the compression process.

[0047] In this embodiment, the water containing chamber 17 is connected to the bottom end of the central tube 14 , that is, the water containing chamber 17 is connected to an end of the central tube 14 away from the filter element seat 12 and the pure water inlet h2 .

[0048] In this embodiment, the water chamber 17 is formed by expanding the central tube 14 toward the peripheral direction, so that the cross-sectional area of ​​the water chamber 17 is larger than the central tube 14 , and the water storage capacity of the water chamber 17 can be increased without increasing the size of the filter bottle 11 .

[0049] For the variable volume setting of pure water passage r2, refer to Figure 4In another embodiment, a partition 18 is provided in the central tube 14, the edge of the partition 18 is attached to the inner wall of the central tube 14, and the space of the central tube 14 is divided into two parts, one part is connected to the pure water pipeline 122 and the pure water port h2, and the other part is not connected to the pure water pipeline 122 and the pure water port h2, and is an independent space. The partition 18 can slide along the central tube 14 and be elastically supported, and the ratio of the two parts of the space separated by the partition 18 can be changed, so that the volume of pure water in the central tube 14 can be changed, and the elastically supported partition 18 can make the volume of the central tube 14 proportional to the pure water pressure. Both of these embodiments can realize that the volume of the pure water passage r2 can be changed, and is proportional to the pure water pressure in the pure water passage r2.

[0050] In this embodiment, the bottom end of the central tube 14 is a closed structure. In the space where the central tube 14 is separated by the partition 18 and is not connected to the pure water port h2, at least one elastic member 181 is provided. The two ends of the elastic member 181 respectively support the partition 18. The closed end of the central tube 14 is the bottom end. The elastic member 181 can be provided as a compression spring. If multiple elastic members 181 are provided, the parts supported by the multiple elastic members 181 on the partition 18 are symmetrically arranged about the center of the partition 18, so that the elastic support received by the partition 18 is balanced, thereby ensuring that the up and down sliding of the partition 18 is more stable and reliable.

[0051] In this embodiment, a plurality of guide structures are provided on the inner wall of the central tube 14, which are not shown in the figure. The guide structures are circumferentially spaced from each other and extend along the length direction of the central tube 14. The outer periphery of the partition 18 is slidably connected to the guide structures. The guide structures can be specifically configured as vertically extending slide bars, and the outer periphery of the partition 18 is provided with a slot at the corresponding slide bar and is slidably embedded in the slide bar, so that the sliding connection is realized; the slot can also be provided on the inner wall of the central tube 14, and the slide bar can be provided on the outer periphery of the partition 18. By providing the guide structures, the partition 18 can slide up and down smoothly, avoiding the occurrence of jamming, and can also avoid the partition 18 from tilting and causing the sealing failure of its separation.

[0052] Implementation Case 2:

[0053] A water purification system, referring to Figure 5 Combined with Figure 1-4, including a reverse osmosis filtration component 1, a raw water pipe t1, a concentrated water pipe t2, a normal temperature water pipe t3 and a hot water pipe t4. The reverse osmosis filtration component 1 is as shown in the implementation case 1, the raw water pipe t1 is used to input raw water to the raw water inlet h1 of the reverse osmosis filtration component 1, and the raw water pipe t1 is provided with a raw water inlet valve v1 and a booster pump p1; the concentrated water pipe t2 is used to discharge concentrated water output from the concentrated water inlet h3 of the reverse osmosis filtration component 1, and the concentrated water pipe t2 is provided with a concentrated water outlet valve v2; the normal temperature water pipe t3 and the hot water pipe t4 are arranged in parallel, and are used to discharge pure water output from the pure water inlet h2 of the reverse osmosis filtration component 1, the normal temperature water pipe t3 is provided with a normal temperature outlet valve v3, and the hot water pipe t4 is provided with a flow control pump p2 and a heating pipe c1.

[0054] By providing the above-mentioned pipe structure and the valve structure configured on the pipeline, as well as functional structures such as the booster pump p1 and the heating pipe c1, the water purification system can efficiently and quickly output normal temperature water and hot water. In addition, the structural composition of the entire water purification system has been streamlined and the pipeline line layout has also been optimized.

[0055] The water purification system of this embodiment also includes a pre-filter element f1, a post-filter element f2 and a pure water pipe t5. The pre-filter element f1 is arranged on the raw water pipe t1, and is used to pre-filter the raw water in the raw water pipe t1, and the raw water after pre-filtration is then transported to the reverse osmosis filtration component 1 for filtration; the pure water pipe t5 connects the reverse osmosis filtration component 1 and the post-filter element f2, and the pure water pipe t5 transports the pure water output by the reverse osmosis filtration component 1 to the post-filter element f2, and the post-filter element f2 performs post-filtration on the pure water; the normal temperature water pipe t3 and the hot water pipe t4 are connected in parallel to the post-filter element f2, and normal temperature water or hot water is output according to the user's choice.

[0056] This embodiment can remove larger impurities in the water, such as sand, rust, algae and other particulate matter visible to the naked eye, by setting a pre-filter element f1. The pre-filtration can effectively protect the reverse osmosis filter component 1 from the influence of large particle impurities, thereby extending the service life of the entire water purification system. The post-filter element f2 is responsible for intercepting finer pollutants in the pure water, including bacteria, viruses, heavy metal ions and other small molecules that are harmful to the human body. In addition to further purifying the water quality, the activated carbon or other special materials in the post-filter element f2 can also remove discoloration and odor in the water, making the purified water clearer and tastier.

[0057] In this embodiment, the pre-filter element f1 and the post-filter element f2 are combined into a composite filter element f. Combining the two into a composite filter element f can simplify the overall structural setting, simplify the pipeline layout and optimize the space required for the water purification system.

[0058] In this embodiment, a pressure sensor g is provided on the pure water pipe t5 for detecting the pure water outlet pressure of the reverse osmosis filtration component 1, so that the water purification system can judge whether the pure water passage r2 in the reverse osmosis filtration component 1 needs to store pure water according to the size of the pure water outlet pressure.

[0059] In this embodiment, the hot water pipe t4 is provided with a flow meter c2, which can be arranged between the flow control pump p2 and the heating pipe c1. The flow meter c2 can detect the flow rate of hot water in the hot water pipe t4, and cooperate with the flow control pump p2 to accurately control the hot water output of the hot water pipe t4.

[0060] Implementation Case 3:

[0061] A control method is based on the water purification system shown in implementation case 2.

[0062] The control method of this implementation case refers to Figure 5 Combined with Figure 1-4 , including normal temperature water intake mode, water storage mode, hot water intake mode and backwash mode.

[0063] In the normal temperature water intake mode of this embodiment, the flow control pump p2 and the heating tube c1 are closed, and the raw water inlet valve v1, the booster pump p1, the concentrated water outlet valve v2 and the normal temperature outlet valve v3 are opened. When the raw water inlet valve v1 and the booster pump p1 are opened, the raw water is transported by the raw water pipe t1, and the raw water passes through the pre-filtration of the composite filter element f and enters the reverse osmosis filtration component 1 for filtration to generate pure water and concentrated water. When the concentrated water outlet valve v2 is opened, the concentrated water is discharged from the concentrated water pipe t2. When the normal temperature outlet valve v3 is opened, the pure water is transported to the composite filter element f through the pure water pipe t5 for post-filtration, and the pure water after post-filtration is output from the normal temperature water pipe t3. In the normal temperature water intake mode, the volume of the pure water passage r2 is in a relatively low state, and the volumes of the two corresponding pure water passages r2 can be changed. In the first embodiment, the volume of the part of the space in the water containing chamber 17 connected to the central pipe 14 is relatively small, and the volume of the part of the space filled with the compressible medium is relatively large. In another embodiment, the partition 18 is at a higher level, so that the volume of the space of the central tube 14 connected to the pure water inlet h2 is smaller, and the volume of the undivided space not connected to the pure water inlet h2 is larger.

[0064] In the water storage mode of this embodiment, the pure water outlet pressure of the reverse osmosis filter assembly 1 is detected. When the pure water outlet pressure is lower than the first threshold, the water storage mode is started. In the water storage mode, the normal temperature outlet valve v3, the flow control pump p2 and the heating tube c1 are closed, and the raw water inlet valve v1, the booster pump p1 and the concentrated water outlet valve v2 are opened, so that the volume of the pure water passage r2 gradually increases until the pure water outlet pressure of the reverse osmosis filter assembly 1 reaches the second threshold. The pure water outlet pressure is detected by the pressure sensor g. When the pressure state is detected, the normal temperature outlet valve v3 and the flow control pump p2 are closed, so that the pure water cannot be output. When the raw water inlet valve v1, the booster pump p1 and the concentrated water outlet valve v2 are opened, the raw water is continuously input into the reverse osmosis filter assembly 1, and the raw water passage r1 maintains a high pressure state, so that the pure water can be continuously input into the pure water passage r2, thereby gradually increasing the volume of the pure water passage r2. In the water storage mode, the water storage capacity of the pure water passage r2 can be increased, so that the user can maintain a large water output in the initial stage of water extraction, whether it is water at room temperature or hot water, so that the user has a better experience. In the water storage and water extraction mode, the volume of the pure water passage r2 is in a relatively high state, and the volumes of the two corresponding pure water passages r2 can be changed. In the first embodiment, the volume of the part of the space in the water chamber 17 connected to the central tube 14 is larger, and the volume of the part filled with compressible medium is smaller. In another embodiment, the partition 18 is at a lower horizontal height, so that the volume of the part of the space connected to the pure water port h2 of the central tube 14 is larger, and the volume of the undivided space not connected to the pure water port h2 is smaller.

[0065] In this implementation case, the first threshold is set to 0.03-0.07mTa, the optimal value is set to 0.05mTa, the second threshold is set to 0.2-0.6mTa, and the optimal value is set to 0.4mTa.

[0066] In the hot water intake mode of this implementation case, the raw water inlet valve v1, the booster pump p1, the concentrated water outlet valve v2 and the normal temperature water inlet valve are closed, and the flow control pump p2 and the heating pipe c1 are turned on. In the hot water intake mode, since the raw water inlet valve v1, the booster pump p1, the concentrated water outlet valve v2 and the normal temperature water inlet valve are all in the closed state, the raw water stops being input to the reverse osmosis filter assembly 1, and the concentrated water stops being discharged. The reverse osmosis filter assembly 1 outputs the pure water stored in the pure water passage r2. After the pure water is post-filtered by the composite filter element f, it is output by the hot water pipe t4 under the control of the flow control pump p2. The pure water is heated by the heating pipe c1 and output after forming hot water. In most usage scenarios, the amount of water taken by users to take hot water is small, and there is no need to input raw water. The pure water stored in the reverse osmosis filter assembly 1 can meet the usage needs. In addition, compared with the prior art, since the volume of the pure water passage r2 can be changed in this embodiment, the flow rate of the heated water can be regulated without pure water reflux, the control logic is simplified, and no water is wasted.

[0067] It should be noted that in the present embodiment, if the user needs to take a large amount of hot water, the pure water output pressure of the reverse osmosis filter component 1 will continue to drop and drop to the first threshold value. Therefore, when the pressure value detected by the pressure sensor g is less than the first threshold value, the water storage mode is started again to increase the amount of pure water in the reverse osmosis filter component 1 and increase the pure water output pressure, so that the user can continuously take hot water.

[0068] The backwash mode of this embodiment has two start-up conditions: one is to stop the normal temperature water intake mode to drive the backwash mode; the other is to drive the backwash mode when the pure water outlet water pressure of the reverse osmosis filtration component 1 reaches a second threshold.

[0069] In the backwash mode of this embodiment, the raw water inlet valve v1, the booster pump p1, the normal temperature inlet valve, the flow control pump p2 and the heating tube c1 are closed, the concentrated water outlet valve v2a seconds are opened and the backwash water path r4 is connected, so that the pure water in the pure water path r2 flows into the raw water path r1 and flushes the reverse osmosis filter element 13. The raw water inlet valve v1 and the booster pump p1 are in a closed state, and the concentrated water outlet valve v2 is in an open state. Since the raw water passage r1 and the pure water passage r2 in the reverse osmosis filter element 13 component are directly connected, the reverse osmosis filtration component 1 is in a state of not inputting raw water but continuously outputting concentrated water, so that the water pressure of the raw water passage r1 is in a low pressure state. Since the normal temperature water inlet valve and the flow control pump p2 are in a closed state, the reverse osmosis filtration component 1 is in a state of not outputting pure water, so that the water pressure of the pure water passage r2 remains in a high pressure state. Therefore, the water pressure of the pure water passage r2 will be greater than the water pressure of the raw water passage r1, and the water pressure difference between the two reaches the pressure difference threshold, the pure water in the pure water passage r2 will flow into the raw water passage r1 through the backwash water passage r4, and flush the reverse osmosis filter element 13, and discharge all the large particles of impurities with the concentrated water out of the reverse osmosis filtration component 1, thereby playing a purification role.

[0070] In this implementation case, in the backwash mode, the concentrated water outlet valve v2 is opened for 3-10 seconds, so that all large particles in the reverse osmosis filter assembly 1 can be discharged and purified.

[0071] Finally, it should be noted that the above implementation cases are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned implementation cases, those skilled in the art should understand that they can still modify the technical solutions recorded in the aforementioned implementation cases, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the implementation cases of the present invention.

Claims

1. A control method for a water purification system, characterized in that: The water purification system comprises: A reverse osmosis filtration component (1), wherein a raw water passage (r1), a pure water passage (r2) and a concentrated water passage (r3) are provided in the reverse osmosis filter element (13); the raw water passage (r1) is provided with a reverse osmosis filter element (13), so that raw water in the reverse osmosis filter element (13) generates pure water entering the pure water passage (r2) through reverse osmosis flow direction, and generates concentrated water entering the concentrated water passage (r3) through raw water passage (r1) flow direction; the volume of the pure water passage (r2) is variable and is proportional to the pure water pressure in the pure water passage (r2); A raw water pipe (t1) for inputting raw water into the raw water inlet (h1) of the reverse osmosis filtration assembly (1), wherein the raw water pipe (t1) is provided with a raw water inlet valve (v1) and a booster pump (p1); A concentrate pipe (t2) for discharging concentrate outputted from the concentrate outlet (h3) of the reverse osmosis filtration assembly (1), wherein the concentrate pipe (t2) is provided with a concentrate outlet valve (v2); A normal temperature water pipe (t3) and a hot water pipe (t4) are arranged in parallel, and are used to discharge the pure water outputted from the pure water outlet (h2) of the reverse osmosis filtration assembly (1); the normal temperature water pipe (t3) is provided with a normal temperature water outlet valve (v3), and the hot water pipe (t4) is provided with a flow control pump (p2) and a heating pipe (c1); The control method includes a normal temperature water intake mode. In the normal temperature water intake mode, the flow control pump (p2) and the heating pipe (c1) are turned off, and the raw water inlet valve (v1), the booster pump (p1), the concentrated water outlet valve (v2) and the normal temperature outlet valve (v3) are turned on.

2. The control method of the water purification system according to claim 1, characterized in that: The control method also includes a water storage mode, which detects the pure water outlet pressure of the reverse osmosis filter component (1). When the pure water outlet pressure is lower than a first threshold, the water storage mode is started. In the water storage mode, the normal temperature outlet valve (v3), the flow control pump (p2) and the heating tube (c1) are closed, and the raw water inlet valve (v1), the booster pump (p1) and the concentrated water outlet valve (v2) are opened, so that the volume of the pure water passage (r2) gradually increases until the pure water outlet pressure of the reverse osmosis filter component (1) reaches a second threshold.

3. The control method of the water purification system according to claim 2, characterized in that: The first threshold is set to 0.03-0.07mTa, and the second threshold is set to 0.2-0.6mTa.

4. The control method of the water purification system according to claim 2, characterized in that: The control method also includes a hot water intake mode. In the hot water intake mode, the raw water inlet valve (v1), the booster pump (p1), the concentrated water outlet valve (v2) and the normal temperature water inlet valve are closed, and the flow control pump (p2) and the heating tube (c1) are opened.

5. The control method of the water purification system according to claim 4, characterized in that: If the pure water outlet pressure of the reverse osmosis filtration component (1) is lower than a first threshold value in the hot water intake mode, the water storage mode is started.

6. The control method of the water purification system according to claim 2, characterized in that: The reverse osmosis component is provided with a backwashing water circuit (r4), the backwashing water circuit (r4) connects the pure water circuit (r2) and the raw water circuit (r1), and can be blocked or connected; the control method also includes a backwashing mode, which is started when the normal temperature water intake mode is stopped or the pure water outlet water pressure of the reverse osmosis filtration component (1) reaches a second threshold value. In the backwashing mode, the raw water inlet valve (v1), the booster pump (p1), the normal temperature inlet valve, the flow control pump (p2) and the heating pipe (c1) are closed, the concentrated water outlet valve (v2) is opened for a second and the backwashing water circuit (r4) is connected, so that the pure water in the pure water circuit (r2) flows into the raw water circuit (r1) and flushes the reverse osmosis filter element (13).

7. The control method of the water purification system according to claim 6, characterized in that: In the backwash mode, the concentrated water outlet valve (v2) is opened for 3-10 seconds.

8. The control method of the water purification system according to any one of claims 1 to 7, characterized in that: The water purification system also includes: A pre-filter element (f1) is used for pre-filtering the raw water in the raw water pipe (t1); A pure water pipe (t5), used for outputting the pure water produced by the reverse osmosis filtration assembly (1); The post-filter element (f2) is used to post-filter the pure water in the pure water pipe (t5), and to transport the pure water after post-filtration to the normal temperature water pipe (t3) and the hot water pipe (t4).

9. The control method of the water purification system according to claim 8, characterized in that: The pre-filter element (f1) and the post-filter element (f2) are combined into a composite filter element (f).

10. The control method of the water purification system according to claim 8, characterized in that: The pure water pipe (t5) is provided with a pressure sensor (g) for detecting the outlet water pressure of the pure water of the reverse osmosis filtration assembly (1).

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