A device for domestic use for purifying water by mass

Abstract

The utility model provides a kind of equipment of domestic quality use water purification, including shell and municipal water inlet on shell, washing water outlet, soft water outlet, ultrafiltration water outlet, pure water outlet, waste water outlet, shell inside is equipped with water supply main pipeline, soft water branch, domestic water branch and drinking water branch, water supply main pipeline is equipped with municipal water inlet, water pressure sensor, first PP cotton filter and flowmeter in proper order, the pipeline between first PP cotton filter and flowmeter is communicated with washing water outlet, the main pipeline connected at the outlet of flowmeter is communicated with soft water outlet by parallel resin tank I, resin tank II to form soft water branch, first PP cotton filter is communicated with ultrafiltration water outlet by ultrafiltration membrane filter to form domestic water branch, first PP cotton filter is communicated with pure water outlet by RO membrane filter to form drinking water branch, and the shell is equipped with unsaturated salt tank and saturated salt tank.The utility model can reduce the sodium ion content in drinking water, and adopt double-tank design to supply water for user without interruption.

Description

Technical Field

[0001] The invention belongs to the technical field of water purification equipment, and in particular relates to a household quality-based water purification equipment. Background Art

[0002] Household water purifiers have been on the market for decades, with numerous brands, severe homogeneity, and limited functionality, far from adapting to market changes. They generally utilize RO membrane technology or ultrafiltration membrane technology to provide single-function water. Due to China's vast territory, water quality varies significantly between the north and south. The south relies on surface water, which has lower calcium and magnesium ion content, while areas north of the Yangtze River rely on groundwater, which contains excessive calcium and magnesium ions due to geological factors. Currently, water purifiers sold in northern China are manufactured by southern manufacturers based on southern water quality and are not suitable for northern water quality. This results in frequent RO membrane filter replacements, increasing operating costs. Furthermore, excessive calcium and magnesium ion content can clog the RO membrane, increasing backwash frequency and wastewater volume, resulting in a waste of water resources. With the advancement of technology, people are no longer satisfied with single-function water purifiers and are seeking soft water in their homes to comprehensively improve their living standards. To address this issue, the quality-based water purification equipment used in northern China must first remove calcium and magnesium ions before passing them through the RO membrane. The technical means of removing calcium and magnesium ions is to flush the resin with saturated brine. However, because saturated brine contains a large amount of sodium ions, a large amount of sodium ions are adsorbed on the resin surface, resulting in excessive sodium ions on the resin surface. This, in turn, causes excessive sodium ions in the soft water after the resin is purified. At this time, large amounts of tap water are required to flush the water to reduce the sodium ion content, increasing the amount of wastewater. Furthermore, existing water softening equipment uses a single resin tank. When the resin tank needs to be flushed and regenerated or the resin needs to be replaced, the equipment must stop discharging water, affecting user water use. Summary of the Invention

[0003] In order to solve the technical problems existing in the prior art, the present invention provides a household water purification device for divided use by quality, which can not only effectively reduce the sodium ion content in water, but also adopts a dual-tank design of one for use and one for backup, which can provide water to users uninterruptedly.

[0004] The purpose of the present invention and the solution to its technical problems are achieved by adopting the following technical solutions. A household water purification device for divided water use according to the present invention includes a shell, which is provided with a municipal water inlet, a washing water outlet, a soft water outlet, an ultrafiltration water outlet, a pure water outlet, a waste water outlet and a control module. The shell is provided with a water supply main line, a soft water branch, a domestic water branch and a drinking water branch. The water supply main line is provided with a municipal water inlet, a water pressure sensor, a first PP cotton filter and a flow meter in sequence. The pipeline between the first PP cotton filter and the flow meter is connected to the washing water outlet. The main line connected to the flow meter outlet is connected to the soft water outlet through the resin tanks I and II connected in parallel to form the soft water branch. A first solenoid valve is provided on the pipeline between the flow meter and the first water inlet at the upper end of the resin tank I, and a solenoid valve is provided between the flow meter and the second water inlet at the upper end of the resin tank II. A second solenoid valve is provided on the pipeline, and the first water outlet at the lower end of the resin tank I is connected to the soft water outlet through the third solenoid valve and the second PP cotton filter, and the second water outlet at the lower end of the resin tank II is connected to the soft water outlet through the fourth solenoid valve and the second PP cotton filter; the first PP cotton filter is also connected to the ultrafiltration water purification port through the ultrafiltration membrane filter to form the domestic water branch; the first PP cotton filter is also connected to the pure water port through the RO membrane filter to form the drinking water branch; an unsaturated salt tank and a saturated salt tank are also provided in the shell, and the pipeline between the first PP cotton filter and the flowmeter is connected to the water inlet at the upper end of the saturated salt tank through the fifth solenoid valve, and the pipeline between the first PP cotton filter and the flowmeter is connected to the water inlet at the upper end of the unsaturated salt tank through the sixth solenoid valve. A first pump is provided at the bottom of the saturated salt tank, and the outlet of the first pump is connected to the unsaturated salt tank via a pipeline. A second pump and a third pump are provided at the bottom of the unsaturated salt tank, and the outlet of the second pump is connected to the first inlet at the upper end of the resin tank I via a pipeline, and the outlet of the third pump is connected to the second inlet at the upper end of the resin tank II via a pipeline; a first automatic exhaust valve is provided at the upper end of the resin tank I, and the first interface at the lower end of the resin tank I is connected to the wastewater outlet through a first pipe, and a seventh solenoid valve is provided on the first pipe; a second automatic exhaust valve is provided at the upper end of the resin tank II, and the second interface at the lower end of the resin tank II is connected to the wastewater outlet through a second pipe, and a seventh solenoid valve is provided on the second pipe. The eighth solenoid valve; the pipeline between the water pressure sensor and the first PP cotton filter is connected to the first interface through the ninth solenoid valve, and the pipeline between the water pressure sensor and the first PP cotton filter is connected to the second interface through the tenth solenoid valve; a first backwash outlet is provided at a position near the upper side of the resin tank I, and the first backwash outlet is connected to the wastewater outlet through a pipeline through the eleventh solenoid valve; a second backwash outlet is provided at a position near the upper side of the resin tank II, and the second backwash outlet is connected to the wastewater outlet through a pipeline through the twelfth solenoid valve; the control module is electrically connected to the first to thirteenth solenoid valves, the flow meter, and the water pressure sensor.

[0005] Furthermore, a booster water pump is installed on the pipeline between the municipal water inlet and the water pressure sensor, and the booster water pump is controlled by the control module.

[0006] Furthermore, the pipeline between the first PP cotton filter and the flow meter is also connected to the pipeline between the ultrafiltration membrane filter and the second PP cotton filter through a regulating valve.

[0007] Furthermore, a first high liquid level sensor and a first low liquid level sensor are provided on the side wall of the saturated salt tank in the vertical direction; a second high liquid level sensor and a second low liquid level sensor are provided on the side wall of the unsaturated salt tank in the vertical direction; each high liquid level sensor and each low liquid level sensor are electrically connected to the control module.

[0008] Furthermore, the wastewater pipe of the RO membrane filter is connected to the wastewater outlet, and a thirteenth solenoid valve is provided on the wastewater pipe of the RO membrane filter.

[0009] Furthermore, the control module includes a display module, a button module, and a wireless WIFI module.

[0010] Furthermore, the water supply main line, the washing water outlet line, the soft water outlet line and the waste water outlet line all use quarter-section stainless steel corrugated pipes.

[0011] Furthermore, the resin tank is filled with food-grade resin, the saturated salt box is filled with saturated salt water, and the unsaturated salt box is filled with unsaturated salt water.

[0012] By means of the above technical solution, the beneficial effects of the present invention are:

[0013] 1. According to the different water hardness in various regions of northern China, the present invention adopts a certain proportion of saturated salt water and municipal tap water to make a certain proportion of unsaturated salt water to clean and exchange the resin, which can ensure that the sodium ion content in the water outlet after passing through the resin tank, ultrafiltration membrane filter, and ultrafiltration water purification outlet does not exceed the standard. In addition, the amount of municipal water required for flushing is also reduced after flushing with unsaturated salt water, thereby saving water.

[0014] 2. The resin tanks in the present invention adopt a dual-tank design with one in use and one in reserve. When the water inflow of one of the resin tanks reaches the rated water volume, the resin needs to be cleaned and replaced. At this time, unsaturated brine flushing is required, and the other resin tank is automatically started to facilitate uninterrupted water use for users, changing the water outage phenomenon caused by cleaning and replacing the resin in a single tank.

[0015] 3. This invention combines various filter media, including soft water and purified water, into a single device. The device integrates an ultrafiltration membrane filter, an RO membrane filter, a PP cotton filter, and a resin tank, achieving a one-inlet, five-outlet, differentiated water supply. The five outlets provide washing water, soft water, ultrafiltration purified water, RO purified water, and wastewater, respectively, to meet user water needs. The entire device is automatically controlled and programmed through a control module, allowing it to further integrate with the Internet of Things to serve the public.

[0016] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present invention more obvious and easy to understand, the following preferred embodiments are specifically cited and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 The present invention is a schematic diagram of the structural principle of a household water purification device for use according to water quality. DETAILED DESCRIPTION

[0018] The technical solution of the present invention is further described in detail below in conjunction with the accompanying drawings and preferred embodiments.

[0019] like Figure 1 A household water purification device for different water quality levels includes a housing, a municipal water inlet 1, a washing water outlet 2, a soft water outlet 3, an ultrafiltration water outlet 4, a purified water outlet 5, a wastewater outlet 6, and a control module 7. The housing is internally provided with a main water supply line, a soft water branch, a domestic water branch, and a drinking water branch. The main water supply line is sequentially provided with the municipal water inlet 1, a booster pump 8, a water pressure sensor 9, a first PP cotton filter 10, and a flow meter 11. The line between the first PP cotton filter 10 and the flow meter 11 is connected to the washing water outlet 2. The water pressure sensor is used to measure the water pressure of the main water supply line in real time. The booster pump 8 is designed to start when the water pressure at the municipal water inlet falls below 1 MPa and to stop when the pressure exceeds 2.5 MPa.

[0020] The main line 111 connected to the outlet of flowmeter 11 is connected to the soft water outlet 3 through the parallel resin tanks I 12 and II 13, forming a soft water branch line. A first solenoid valve 01 is installed on the line between the flowmeter 11 and the first water inlet 121 at the upper end of resin tank I 12, and a second solenoid valve 02 is installed on the line between the flowmeter and the second water inlet 131 at the upper end of resin tank II 13. The first solenoid valve is located near the first water inlet, and the second solenoid valve is located near the second water inlet. The first water outlet 122 at the lower end of resin tank I is connected to the soft water outlet 3 through a third solenoid valve 03 and a second PP cotton filter 14, which are located near the first water outlet. The second water outlet 132 at the lower end of resin tank II is connected to the soft water outlet 3 through a fourth solenoid valve 04 and a second PP cotton filter 14, which are located near the second water outlet. Resin tanks I and II are designed to be used in a single unit and used in a backup unit. When one resin tank is in normal use and producing soft water, the other resin tank is on standby or undergoing resin exchange and flushing.

[0021] The first PP cotton filter 14 is also connected to the ultrafiltration water purification port 4 through the ultrafiltration membrane filter 15 to form the domestic water branch; the first PP cotton filter 14 is also connected to the pure water port 5 through the RO membrane filter 16 to form the drinking water branch.

[0022] The pipeline between the first PP cotton filter 10 and the flowmeter 11 is also connected to the pipeline between the ultrafiltration membrane filter 15 and the second PP cotton filter 14 via a regulating valve 17. Because the water is soft after being processed by the resin tank and the ultrafiltration membrane filter, the water flowing out of the ultrafiltration water purification port contains a low content of trace elements required by the human body. However, when making soup or porridge, it is often necessary to retain some trace elements required by the human body. By adding water with a certain hardness, the taste can be adjusted and the content of trace elements such as calcium and magnesium ions in domestic water can be increased to meet various user needs. By controlling the opening and closing degree of the regulating valve, the water quality can be arbitrarily controlled.

[0023] An unsaturated salt tank 18 and a saturated salt tank 19 are provided within the housing. The pipeline between the first PP cotton filter and the flowmeter is connected to the water inlet at the upper end of the saturated salt tank 19 via a fifth solenoid valve 05. The pipeline between the first PP cotton filter and the flowmeter is connected to the water inlet at the upper end of the unsaturated salt tank 18 via a sixth solenoid valve 06. A first pump 191 is provided at the bottom of the saturated salt tank 19. The outlet of the first pump 191 is connected to the unsaturated salt tank 18 via a pipeline. A second pump 181 and a third pump 182 are provided at the bottom of the unsaturated salt tank. The outlet of the second pump 181 is connected to the first inlet 123 at the upper end of the resin tank I via a connecting pipeline. The outlet of the third pump 182 is connected to the second inlet 133 at the upper end of the resin tank II via a connecting pipeline. Two capacitive liquid level sensors, one high and one low, are provided on the side wall of the saturated salt tank 19 in the vertical direction, wherein the first high liquid level sensor 192 is provided corresponding to the preset highest liquid level in the saturated salt tank, and the first low liquid level sensor 193 is provided corresponding to the preset lowest liquid level in the saturated salt tank; similarly, two capacitive liquid level sensors, one high and one low, are also provided on the side wall of the unsaturated salt tank in the vertical direction, wherein the second high liquid level sensor 183 is provided corresponding to the preset highest liquid level in the unsaturated salt tank, and the second low liquid level sensor 184 is provided corresponding to the preset lowest liquid level in the unsaturated salt tank; each high liquid level sensor and low liquid level sensor is electrically connected to the control module 7. The resin tanks contain food-grade resin, and the saturated salt tanks are filled with softening salt (ion exchange resin regeneration agent). The saturated salt tanks convert the soft water into highly concentrated brine, which then holds the saturated brine. They also provide a certain amount of highly concentrated brine for the unsaturated salt tanks, allowing the highly concentrated brine to be mixed with tap water to produce a 5%-8% diluted brine (unsaturated brine). The unsaturated salt tanks adjust the proportion of diluted brine required for rinsing each resin tank based on the varying water hardness in different regions. Due to the varying water hardness in different regions, the concentration of diluted brine in the unsaturated salt tanks and the amount of diluted brine used to clean the exchange resins can be adjusted based on the specific water quality. Because the present invention uses unsaturated brine to clean the calcium and magnesium ions from the exchange resins, the amount of unsaturated brine required is slightly greater than the saturated brine used in the prior art. Furthermore, the gaps between the resins are smaller, allowing the unsaturated brine to slowly penetrate the gaps, removing calcium and magnesium ions from the resins during the penetration process. The use of unsaturated brine in the present invention also increases the time the unsaturated brine spends penetrating the resins, extending the contact and exchange time between the unsaturated brine and the resins, resulting in more complete resin cleaning and exchange.

[0024] A first automatic exhaust valve 124 is installed at the top of resin tank I. A first port 125 at the bottom of resin tank I communicates with the wastewater outlet 6 via a first tube 126, which is equipped with a seventh solenoid valve 07. A second automatic exhaust valve 134 is installed at the top of resin tank II. A second port 135 at the bottom of resin tank II communicates with the wastewater outlet via a second tube 136, which is equipped with an eighth solenoid valve 08. These first and second automatic exhaust valves are conventional and primarily serve to balance the pressure inside the resin tank and the outside world. When draining wastewater, the automatic exhaust valves open, allowing atmospheric pressure to enter the resin tank and facilitate wastewater discharge.

[0025] The pipeline between the water pressure sensor and the first PP cotton filter is connected to the first port 125 via the ninth solenoid valve 09. The pipeline between the water pressure sensor and the first PP cotton filter is connected to the second port 135 via the tenth solenoid valve 010. A first backwash outlet 127 is located near the top of resin tank I and is connected to the wastewater outlet via a pipeline via the eleventh solenoid valve 011. A second backwash outlet 137 is located near the top of resin tank II and is connected to the wastewater outlet via a pipeline via the twelfth solenoid valve 012.

[0026] The waste water pipe of the RO membrane filter is also connected to the waste water outlet, and a thirteenth solenoid valve 013 is provided on the waste water pipe of the RO membrane filter.

[0027] The control module is electrically connected to the first to thirteenth solenoid valves, the water pressure sensor, the flow meter, the first high liquid level sensor, the second high liquid level sensor, the first low liquid level sensor, and the second low liquid level sensor. The control module includes a display module, a key module, and a wireless WIFI module.

[0028] In this invention, the main water supply line, the washing water outlet pipe, the soft water outlet pipe, and the wastewater outlet pipe all use quartered stainless steel bellows, which has a large water flow rate and can meet all household water needs. The water purification equipment of this invention has changed the existing single-function water purifier, with one water inlet and five outlets (washing water outlet, soft water outlet, ultrafiltration water outlet, pure water outlet, and wastewater outlet). The wastewater outlet can be connected to the toilet pipeline to realize wastewater flushing.

[0029] In summary, the present invention can use unsaturated brine of varying concentrations to treat municipal tap water of varying hardness, resulting in effluent water that meets sanitary drinking water standards. The present invention also uses unsaturated brine to clean the resin, thereby ensuring that sodium ion levels do not exceed the standard. This ensures superior effluent quality when used as an inlet source for RO or ultrafiltration membranes, and can extend the lifespan of these membranes.

[0030] The working principle of the present invention is as follows:

[0031] 1. The process of preparing washing water is as follows: the municipal water supply flows out through the pipeline formed by the booster pump, water pressure sensor, first PP cotton filter, and washing water outlet in sequence, thereby providing clean water for the taps in the home.

[0032] 2. The process of making soft water is as follows: municipal tap water passes through the water supply main line, any resin tank, and the second PP cotton filter to form a pipeline and then flows out from the soft water outlet. In this water treatment process, the resin in the resin tank is used to absorb impurities such as calcium and magnesium ions in the water. The water softened by the resin tank is discharged through the soft water outlet. The soft water outlet can be connected to the shower pipe and the faucet pipe on the bathroom cabinet after heating, and can also supply water to the washing machine and toilet.

[0033] Resin Tanks I and II serve as a backup system, one in active use. For example, when the control module detects 500L of water flowing into Resin Tank I via a flow meter, the first solenoid valve closes, stopping water flow into Resin Tank I. The second solenoid valve opens, allowing water flow into Resin Tank II. This activates Resin Tank II to produce soft water, while Resin Tank I begins the resin flushing process with salt water. During normal operation of Resin Tank I, the first and third solenoid valves are both open, providing soft water to the user. At this time, the second and fourth solenoid valves close, placing Resin Tank II in a standby state. This alternating operation of the two tanks ensures uninterrupted, differentiated water supply. While one tank is cleaning and regenerating the resin, the other tank is providing water, ensuring uninterrupted water access.

[0034] 3. The ultrafiltration water purification process is as follows: Municipal water flows through the water supply main, resin tank, second PP cotton filter, and ultrafiltration membrane filter to form a pipeline, and then flows out of the ultrafiltration water purification outlet. The domestic water production process passes through the ultrafiltration membrane filter and is then mixed with a certain amount of municipal tap water through a regulating valve to ensure the water has a certain hardness. Domestic water can be used for cooking, such as making soup. The second PP cotton filter can isolate the loose resin formed after multiple softening and exchange of water, thereby extending the service life of the RO membrane filter and ultrafiltration membrane filter.

[0035] 4. The process of producing pure water is as follows: municipal water passes through the water supply main line, any resin tank, the second PP cotton filter, and the RO membrane filter in sequence to form a pipeline and then flows out from the pure water outlet, so it can be drunk directly.

[0036] 5. The positive flushing process of the resin tank is as follows: when the flow rate of a certain resin tank reaches the preset value in the control module, it is necessary to use unsaturated salt water for positive flushing to soften the resin; for example, when resin tank I needs positive flushing, the first solenoid valve and the third solenoid valve are closed, and the seventh solenoid valve is opened, and the water in resin tank I is discharged to the wastewater outlet 6 along the first interface 125 and the first pipe 126; then the second pump 181 is started, and the unsaturated salt water in the unsaturated salt tank is pumped into the resin tank I by the second pump, the unsaturated salt water is mixed with the resin, and the resin is regenerated by sodium chloride, removing the calcium and magnesium ions on the resin to restore the adsorption capacity of the resin. Since the seventh solenoid valve is in the open state, the unsaturated salt water discharges the calcium and magnesium ions on the resin together from the first interface to the resin tank I. The first solenoid valve then opens, and municipal water, treated through the first PP cotton filter, flushes the resin forward. This water reduces the sodium ion content on the resin surface, preventing excess sodium ions from exceeding the standard during normal soft water production in Resin Tank I. This process requires less municipal water, conserving water. After flushing the resin, the municipal water is discharged through the pipeline connected to the seventh solenoid valve to the wastewater outlet. This completes the forward flushing process, and the seventh solenoid valve closes, placing Resin Tank I in standby mode. When Resin Tank II requires resin cleaning or replacement, Resin Tank I resumes normal operation, and the first and third solenoid valves reopen.

[0037] During this positive flushing process, the unsaturated brine in the unsaturated salt tank flushes and regenerates the resin. The capacity of the unsaturated salt tank is sufficient to flush and regenerate the resin once. After a positive flush, when the water level in the unsaturated salt tank reaches the second low liquid level sensor, the second low liquid level sensor sends a signal to the control module, indicating that the unsaturated salt tank needs to be replenished with saturated salt water. The first pump then opens, pumping a certain amount of saturated salt water from the saturated salt tank into the unsaturated salt tank. Simultaneously, the sixth solenoid valve opens, allowing municipal water to enter the unsaturated salt tank. The municipal water mixes with the saturated salt water to form a certain concentration of unsaturated salt water. The first high liquid level sensor is used to monitor the water level in the unsaturated salt tank to prevent overflow caused by excessive addition of municipal water. The saturated salt tank ensures that there is a certain amount of unsaturated salt water in the unsaturated salt tank after each flush of the resin tank.

[0038] The positive flushing process for Resin Tank II is identical to that for Resin Tank I and will not be further described here. Based on the resin parameters provided by the resin manufacturer and the varying water quality in the user's region, the resin tank loading volume is determined. The volume and concentration of unsaturated brine used for flushing the resin are determined by the local water hardness.

[0039] 6. The salt adding process of the saturated salt box is:

[0040] This embodiment illustrates the need to add salt to the saturated salt tank after five positive flushes. That is, after the saturated salt tank has provided saturated salt water to the unsaturated salt tank five times, the saturated salt water in the saturated salt tank will be exhausted and softening salt will need to be added. At this point, the first low liquid level sensor will detect that the saturated salt water is insufficient. Upon receiving this signal, the control module prompts the user to add a certain amount of softening salt to the saturated salt tank. After addition is complete, the fifth solenoid valve 05 opens, supplying water to the saturated salt tank 19. When the water level reaches the first high liquid level sensor 192, the control module controls the fifth solenoid valve 05 to close, restoring the original saturated salt water level in the saturated salt tank. If the user fails to replenish salt in time, the machine stops operating. After adding salt, the control module can resume normal function.

[0041] 7. The backwash process of the resin tank is:

[0042] After the unsaturated salt tank has been positively flushed four times on a resin tank, the resin will become compacted, reducing the water flow rate into the resin tank. If the positive flushing method is still used for the fifth time, the compacted resin cannot be dispersed by the unsaturated salt water of the positive flushing. At this time, the backwashing process needs to be started to loosen the resin, disperse the compacted resin, and increase the water flow rate into the resin tank. After the backwashing process, the fifth positive flushing can be performed.

[0043] Taking the backwash process for resin tank I as an example, when the backwash process begins, the seventh solenoid valve opens to drain the water from resin tank I. After draining, the seventh solenoid valve closes. Then, the ninth and eleventh solenoid valves open, allowing municipal water to enter resin tank I from first port 125. This water impacts the resin from bottom to top, loosening any compacted resin and increasing the water flow rate. This discharges calcium, magnesium, and other impurities from first backwash outlet 127 and then to the wastewater outlet. The ninth and eleventh solenoid valves close. The fifth forward flush process then begins. The control system controls the second pump to pump unsaturated brine from the unsaturated brine tank into resin tank I. The seventh solenoid valve opens, and the wastewater from the reaction between the unsaturated brine and resin is discharged through first pipe 126 to the wastewater outlet. It can be seen that the backwash process is carried out before the fifth forward flushing process. On the one hand, the backwashing process uses high-pressure water flow to impact the resin from bottom to top, so that the compacted resin is dispersed, the water flow rate of the softening water process is increased, and the blockage is reduced. On the other hand, the backwashing process can discharge impurities and scattered resin directly to the wastewater outlet, thereby improving the effect of the fifth forward flushing.

[0044] The backwash process of resin tank II is similar and will not be described here.

[0045] 8. Resin replacement process: When the resin has been flushed 300 times with unsaturated brine, the resin adsorption capacity is reduced and the softening effect does not meet the requirements, the resin needs to be replaced. The control module displays and reminds the user that the resin in the resin tank needs to be replaced.

[0046] Taking the replacement of the resin in resin tank I as an example, first close the first and third solenoid valves and the seventh solenoid valve. Under the action of gravity, the water in resin tank I is discharged from the first pipe to the wastewater outlet. The manufacturer can be responsible for the subsequent service of replacing the resin.

[0047] In summary, the existing water softener uses saturated salt water to flush and exchange the resin, while the present invention uses unsaturated salt water to exchange and regenerate the resin, which can reduce the sodium ion concentration in the soft water and ensure that the sodium ions in the water flowing out of the ultrafiltration water purification port do not exceed the standard. And because the resin is softened by unsaturated salt water, the amount of municipal tap water required for positive flushing is reduced, thereby achieving the purpose of water saving. The present invention uses two resin tanks to achieve the function of one in use and one in reserve. When one of the resin tanks needs to flush and soften the resin, the other resin tank can still provide the user with a steady supply of water. In addition, the present invention can modify the unsaturated salt water concentration and the amount of water used for a positive flush set in the control module according to the different water hardness in different regions.

[0048] The above description is only a preferred embodiment of the present invention, and any parts not described in detail are all prior art; any simple modifications, equivalent changes and modifications made to the above embodiments by any technician familiar with the profession based on the technical essence of the present invention without departing from the scope of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A household water purification device for use by different water quantities, comprising a housing, characterized in that: The shell is provided with a municipal water inlet, a washing water outlet, a soft water outlet, an ultrafiltration water outlet, a pure water outlet, a wastewater outlet and a control module. The inside of the shell is provided with a water supply main line, a soft water branch, a domestic water branch and a drinking water branch. The water supply main line is provided with a municipal water inlet, a water pressure sensor, a first PP cotton filter and a flow meter in sequence. The pipeline between the first PP cotton filter and the flow meter is connected to the washing water outlet. The main line connected to the flow meter outlet is connected to the soft water outlet through the resin tank I and the resin tank II connected in parallel to form the soft water branch. A first solenoid valve is provided on the pipeline between the flow meter and the first water inlet at the upper end of the resin tank I, and a second solenoid valve is provided on the pipeline between the flow meter and the second water inlet at the upper end of the resin tank II. The first water outlet at the lower end of the resin tank I is connected to the soft water outlet through the third solenoid valve and the second PP cotton filter, and the second water outlet at the lower end of the resin tank II is connected to the soft water outlet through the fourth solenoid valve and the second PP cotton filter. The first PP cotton filter is further connected to the ultrafiltration water purification port through an ultrafiltration membrane filter to form the domestic water branch; the first PP cotton filter is further connected to the pure water port through an RO membrane filter to form the drinking water branch; the pipeline between the first PP cotton filter and the flow meter is further connected to the pipeline between the ultrafiltration membrane filter and the second PP cotton filter through a regulating valve; An unsaturated salt tank and a saturated salt tank are further provided in the shell. The pipeline between the first PP cotton filter and the flow meter is connected to the water inlet at the upper end of the saturated salt tank through a fifth solenoid valve. The pipeline between the first PP cotton filter and the flow meter is connected to the water inlet at the upper end of the unsaturated salt tank through a sixth solenoid valve. The unsaturated salt tank can be adjusted to the proportion of light salt water required for flushing each resin tank according to the different water hardness in different regions. A first pump is provided at the bottom of the saturated salt tank, and the outlet of the first pump is connected to the unsaturated salt tank through a pipeline. A second pump and a third pump are provided at the bottom of the unsaturated salt tank, and the outlet of the second pump is connected to the first inlet at the upper end of the resin tank I through a pipeline. The outlet of the third pump is connected to the second inlet at the upper end of the resin tank II through a pipeline. The upper end of the resin tank I is provided with a first automatic exhaust valve, the first interface at the lower end of the resin tank I is connected to the wastewater outlet through a first pipe, and the first pipe is provided with a seventh solenoid valve; the upper end of the resin tank II is provided with a second automatic exhaust valve, the second interface at the lower end of the resin tank II is connected to the wastewater outlet through a second pipe, and the second pipe is provided with an eighth solenoid valve; the pipeline between the water pressure sensor and the first PP cotton filter is connected to the first interface through a ninth solenoid valve, and the pipeline between the water pressure sensor and the first PP cotton filter is connected to the second interface through a tenth solenoid valve; a first backwash outlet is provided at a position near the upper side of the resin tank I, and the first backwash outlet is connected to the wastewater outlet via a pipeline through an eleventh solenoid valve; a second backwash outlet is provided at a position near the upper side of the resin tank II, and the second backwash outlet is connected to the wastewater outlet via a pipeline through a twelfth solenoid valve; the control module is electrically connected to the first to thirteenth solenoid valves, the flow meter, and the water pressure sensor.

2. A household water purification device according to claim 1, characterized in that: A booster water pump is installed on the pipeline between the municipal water inlet and the water pressure sensor, and the booster water pump is controlled by the control module.

3. The household water purification device according to claim 1, characterized in that: A first high liquid level sensor and a first low liquid level sensor are provided on the side wall of the saturated salt tank in the vertical direction; a second high liquid level sensor and a second low liquid level sensor are provided on the side wall of the unsaturated salt tank in the vertical direction; each high liquid level sensor and each low liquid level sensor are electrically connected to the control module.

4. The household water purification device according to claim 1, characterized in that: The waste water pipe of the RO membrane filter is connected to the waste water outlet, and a thirteenth solenoid valve is provided on the waste water pipe of the RO membrane filter.

5. The household water purification device according to claim 1, characterized in that: The control module includes a display module, a button module, and a wireless WIFI module.

6. The household water purification device according to claim 1, characterized in that: The main water supply line, the washing water outlet line, the soft water outlet line and the waste water outlet line all use quarter-section stainless steel corrugated pipes.

7. The household water purification device according to claim 1, characterized in that: The resin tank is filled with food grade resin, the saturated salt box is filled with saturated salt water, and the unsaturated salt box is filled with unsaturated salt water.

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