Water purifier and control method

Abstract

A water purifier includes a pre-filter group, an RO membrane filter, and a post-filter group, which are connected in series via a pipeline from the water inlet of the water purifier; the purified water outlet of the pre-filter group is connected to the purified water outlet of the water purifier via a second purified water outlet pipeline, and the purified water outlet of the post-filter group is connected to the purified water outlet of the water purifier via a first purified water outlet pipeline, respectively, and a TDS water quality detector is provided downstream of the water outlet of the pre-filter group and downstream of the purified water outlet of the RO membrane filter, respectively, to perform corresponding tests on the water quality of the water filtered by the pre-filter group and the RO membrane filter. The present invention also relates to a control method for a water purifier, which performs a TDS water quality test on the water filtered by the pre-filter group, so that when the corresponding test value of the water filtered by the pre-filter group reaches a set standard value, the filtered water of the pre-filter group is controlled to flow out directly. Through the above-mentioned arrangement, the water purifier can perform corresponding operations according to raw water of different water qualities, so as to improve water production efficiency and extend the service life of the filter element.

Description

Technical Field

[0001] The present invention belongs to the technical field of water purifier equipment, and in particular relates to a water purifier equipped with a pre-filter group and an RO membrane filter and a control method thereof. Background Art

[0002] As we all know, the filters used in water purifiers have a limited lifespan. Once their lifespan reaches an upper limit, the filters can no longer effectively purify or process water. Existing water purifiers lack TDS water quality testing, leaving users unable to determine the water quality before and after purification. Regular filter replacements simply assume the water is in good condition and sufficient for their use. However, this does not reflect the specific degree of purification, nor does it clearly indicate whether the water is suitable for drinking after purification.

[0003] At the same time, the RO membrane filter of the existing water purifier will become clogged after working for a certain period of time. At this time, the filter element needs to be replaced; however, since the filter element of the RO membrane filter has a high manufacturing cost, it is easy to cause the user's use cost to be too high.

[0004] In view of this, the present invention is proposed. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to overcome the shortcomings of the existing technology and provide a water purifier to achieve corresponding filtering treatment of raw water of different water qualities, so as to quickly and efficiently produce purified water that meets the set requirements for users to use; at the same time, the present invention also provides a control method for the water purifier to achieve the purpose of reducing the working time of the filter element of the RO membrane filter and extending its service life.

[0006] In order to solve the above technical problems, the basic concept of the technical solution adopted by the present invention is:

[0007] A water purifier comprises a pre-filter group, an RO membrane filter and a post-filter group which are connected in series in sequence via pipelines from a water inlet of the water purifier; the purified water outlet of the pre-filter group is connected to the purified water outlet of the water purifier via a second purified water outlet pipeline, and the purified water outlet of the post-filter group is connected to the purified water outlet of the water purifier via a first purified water outlet pipeline in a manner that they can be switched on and off; a TDS water quality detector is provided downstream of the water outlet of the pre-filter group and downstream of the purified water outlet of the RO membrane filter respectively, so as to perform corresponding detection on the water quality of the water filtered by the pre-filter group and the RO membrane filter respectively.

[0008] Furthermore, the pre-filter group includes a first melt-blown polypropylene filter, a granular activated carbon filter and a second melt-blown polypropylene filter connected in series through a pipeline from the water inlet, and the filtration accuracy of the first melt-blown polypropylene filter is lower than that of the second melt-blown polypropylene filter.

[0009] Furthermore, the water outlet of the second melt-blown polypropylene filter is connected to the first connecting pipe and the second purified water outlet pipe respectively through a tee, the other end of the first connecting pipe is connected to the RO membrane filter, and the other end of the second purified water outlet pipe is connected to the purified water outlet of the water purifier; the first connecting pipe or the second purified water outlet pipe is provided with a first TDS water quality detector to detect the water quality of the filtered water flowing out of the pre-filter group.

[0010] Furthermore, the water inlet end of the first connecting pipeline is connected to the filtered water outlet of the pre-filter group, and the water outlet end is connected to the water inlet of the RO membrane filter; along the water flow direction of the first connecting pipeline, there are provided in sequence a low-pressure switch for controlling the on-off of the pipeline, an electromagnetic valve for controlling the water flow rate in the pipeline, a first TDS water quality detector for detecting the water quality of the filtered water of the pre-filter group, and a booster pump for increasing the pressure of the water flowing into the RO membrane.

[0011] Furthermore, the post-filter group includes at least a post-activated carbon filter, the water inlet of the post-activated carbon filter is connected to the purified water outlet of the RO membrane filter via a second connecting pipe, and the water outlet of the post-activated carbon filter is connected to the first purified water outlet pipe; the second connecting pipe or the first purified water outlet pipe is provided with a second TDS water quality detector to check the water quality of the filtered water flowing out of the RO membrane filter.

[0012] Furthermore, the concentrated water outlet of the RO membrane filter is connected to the drain pipe of the water purifier, the purified water outlet of the RO membrane filter is connected to the water inlet of the post-activated carbon filter via a second connecting pipe, and the water outlet of the post-activated carbon filter is connected to the first purified water outlet pipe; a second TDS water quality detector is provided on the second connecting pipe to detect the water quality of the filtered water flowing out of the RO membrane filter.

[0013] Furthermore, the water inlet end of the second connecting pipeline is connected to the purified water outlet of the RO membrane filter, and the water outlet end of the second connecting pipeline is connected to the water inlet of the post-filter; along the water flow direction of the second connecting pipeline, there are provided in sequence a high-pressure switch for controlling the on-off of the pipeline, a check valve for controlling the flow direction of water in the pipeline, and a second TDS water quality detector for detecting the water quality of the water filtered by the RO membrane filter.

[0014] The present invention also provides a control method for a water purifier, which includes a pre-filter group, an RO membrane filter and a post-filter group connected in series along the water flow direction; TDS water quality testing is performed on the water filtered by the pre-filter group, so that when the corresponding test value of the water filtered by the pre-filter group reaches a set standard value, the filtered water of the pre-filter group is controlled to flow directly out of the water purification outlet of the water purifier.

[0015] Furthermore, when the TDS water quality test value of the water filtered by the pre-filter group does not reach the set standard value, the filtered water of the pre-filter group is passed through the RO membrane filter for filtration, and the TDS water quality test of the water filtered by the RO membrane filter is performed again. When the corresponding test value of the water filtered by the RO membrane filter reaches the set standard value, the water filtered by the RO membrane filter is treated by the post-activated carbon filter and then flows out from the purified water outlet of the water purifier.

[0016] Furthermore, the specific working process of the water purifier includes the following steps:

[0017] S1, raw water flows in from the water purifier inlet;

[0018] S2, the raw water is filtered in sequence through a pre-filter group consisting of a first melt-blown polypropylene filter, a granular activated carbon filter, and a second melt-blown polypropylene filter, so that the raw water flowing into the water purifier flows through the first melt-blown polypropylene filter, the granular activated carbon filter, and the second melt-blown polypropylene filter in sequence;

[0019] S3. Perform a TDS water quality test on the filtered water flowing out of the second melt-blown polypropylene filter and after being filtered by the pre-filter group. If the test value reaches the set standard value, execute step S4; otherwise, execute step S5;

[0020] S4. The filtered water after being filtered by the pre-filter group flows directly to the purified water outlet of the water purifier through the second purified water outlet pipe for use by the user as purified water;

[0021] S5, the filtered water after the pre-filter group flows to the RO membrane filter and is filtered by the RO membrane filter;

[0022] S6, performing a TDS water quality test on the filtered water flowing out of the purified water outlet of the RO membrane filter and after filtration by the RO membrane filter again. When the test value reaches the set standard value, executing step S7;

[0023] S7, the filtered water after filtration by the RO membrane filter flows to the post-activated carbon filter, and after being filtered by the post-activated carbon filter, flows to the purified water outlet of the water purifier through the first purified water outlet pipe for use by the user as purified water;

[0024] Further preferably, when executing the above step S4, the RO membrane filter stops working, and the purified water outlet of the water purifier only supplies water through the second purified water outlet pipeline.

[0025] After adopting the above technical solution, the present invention has the following beneficial effects compared with the prior art.

[0026] Through the above-mentioned arrangement, the present invention realizes the purpose of performing TDS water quality detection on the water filtered by the pre-filter and the water filtered by the RO membrane filter of the water purifier respectively, and compares the detected value with the set value, so as to achieve the effect of directly using the water filtered by the pre-filter and meeting the water quality standards as the purified water output of the water purifier, thereby achieving the purpose of shortening the working time of the RO membrane filter and increasing the service life of the filter element of the RO membrane filter.

[0027] Furthermore, the present invention utilizes the aforementioned method to ensure that water filtered by the pre-filter unit meets the set quality standards and flows directly through the water purifier's purified water outlet for user access. This avoids the situation where water filtered by the pre-filter unit, even after meeting the quality standards, continues to be filtered through the RO membrane filter. This reduces energy consumption and improves water production efficiency. Furthermore, it shortens the use time of the RO membrane filter and extends its service life. Furthermore, the water purifier can operate according to the different water qualities of raw water, filtering the raw water rationally and efficiently, and producing purified water that meets the set quality standards for user access through the water purifier's purified water outlet.

[0028] At the same time, the present invention has a simple structure, significant effects, and is suitable for popularization and use.

[0029] The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The accompanying drawings are part of the present invention and are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention, but do not constitute an undue limitation of the present invention. Obviously, the drawings described below are only some embodiments. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without inventive effort. In the accompanying drawings:

[0031] Figure 1 Schematic diagram of the connection structure of the water purifier in an embodiment of the present invention;

[0032] Figure 2 is a flow chart of a water purifier control method according to an embodiment of the present invention;

[0033] Figure 3 This is a flow chart of a method for determining the service life of an RO membrane in a water purifier according to an embodiment of the present invention;

[0034] Main original description:

[0035] 1—first melt-blown polypropylene filter, 2—granular activated carbon filter, 3—second melt-blown polypropylene filter, 4—RO membrane filter, 5—post-activated carbon filter element, 6—first purified water outlet pipeline, 7—second purified water outlet pipeline, 8—first connecting pipeline, 9—second connecting pipeline, 10—drain pipe, 11—first TDS water quality detector, 12—second TDS water quality detector, 13—boosting pump, 14—low pressure switch, 15—high pressure switch, 16—solenoid valve, 17—temperature sensor, 18—first control valve, 19—second control valve, 20—purified water outlet.

[0036] It should be noted that these drawings and textual descriptions are not intended to limit the conceptual scope of the present invention in any way, but rather to illustrate the concept of the present invention for those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. The following embodiments are used to illustrate the present invention but are not used to limit the scope of the present invention.

[0038] Example 1

[0039] like Figure 1 As shown, this embodiment introduces a water purifier, which includes a pre-filter group, an RO membrane filter 4 and a post-filter group which are connected in series in sequence through pipelines from the water inlet of the water purifier; the filtered water outlet of the pre-filter group is connected to the clean water outlet 20 of the water purifier via the second clean water outlet pipeline 7, and the filtered water outlet of the post-filter group is connected to the clean water outlet 20 of the water purifier via the first clean water outlet pipeline 6 in a manner that can be switched on and off respectively, and TDS water quality detectors are provided downstream of the filtered water outlet of the pre-filter group and downstream of the filtered water outlet of the RO membrane filter respectively to perform corresponding detection on the water quality of the filtered water of the pre-filter group and the RO membrane filter respectively.

[0040] Through the above settings, the purpose of conducting TDS water quality testing on the water filtered by the pre-filter and the water filtered by the RO membrane filter of the water purifier is achieved, and the test value is compared with the set value, so as to achieve the effect of directly using the water filtered by the pre-filter and meeting the water quality standards as the purified water output of the water purifier, thereby achieving the purpose of shortening the working time of the RO membrane filter and increasing the service life of the filter element of the RO membrane filter.

[0041] In this embodiment, the pre-filter group includes a first melt-blown polypropylene filter 1, a granular activated carbon filter 2 and a second melt-blown polypropylene filter 3 connected in series through a pipeline from the water inlet. The filtration accuracy of the first melt-blown polypropylene filter 1 is lower than that of the second melt-blown polypropylene filter 3.

[0042] In this embodiment, the water outlet of the second melt-blown polypropylene filter 3 is connected to the first connecting pipe 8 and the second purified water outlet pipe 7 through a tee, the other end of the first connecting pipe 8 is connected to the RO membrane filter 4, and the other end of the second purified water outlet pipe 7 is connected to the purified water outlet 20 of the water purifier; the first connecting pipe 8 is provided with a first TDS water quality detector 11 to detect the water quality of the filtered water flowing out of the pre-filter group.

[0043] In this embodiment, the water inlet of the first connecting pipe 8 is connected to the filtered water outlet of the pre-filter group, i.e., the water outlet of the second melt-blown polypropylene filter 3, and the water outlet is connected to the water inlet of the RO membrane filter 4. The first connecting pipe 8 is provided with a low-pressure switch 14 for controlling the on-off of the pipe, a solenoid valve 16 for controlling the flow rate of the water in the pipe, a first TDS water quality detector 11 for testing the quality of the filtered water of the pre-filter group, and a booster pump 13 for increasing the pressure of the water flowing into the RO membrane. Preferably, a temperature sensor 17 is also provided in the pipe section between the solenoid valve 16 and the first TDS water quality detector 11 to monitor the temperature of the water flowing through the RO membrane filter in real time.

[0044] In this embodiment, the post-filter group includes at least a post-activated carbon filter 5, the water inlet of the post-activated carbon filter 5 is connected to the purified water outlet of the RO membrane filter 4 via a second connecting pipe 9, and the water outlet of the post-activated carbon filter 5 is connected to the first purified water outlet pipe 6; the second connecting pipe 9 is provided with a second TDS water quality detector 12 to check the water quality of the filtered water flowing out of the RO membrane filter 4.

[0045] In this embodiment, the concentrated water outlet of the RO membrane filter 4 is connected to the drain pipe 10 of the water purifier, and the purified water outlet of the RO membrane filter 4 is connected to the water inlet of the post-activated carbon filter 5 via the second connecting pipe 9, and the water outlet of the post-activated carbon filter 5 is connected to the first purified water outlet pipe 6; the second connecting pipe 9 is provided with a second TDS water quality detector 12 to detect the water quality of the filtered water flowing out of the RO membrane filter.

[0046] In this embodiment, the water inlet end of the second connecting pipe 9 is connected to the purified water outlet of the RO membrane filter 4, and the water outlet end of the second connecting pipe 9 is connected to the water inlet of the post-filter; the second connecting pipe 9 is provided with a check valve for controlling the flow direction of water in the pipe, a high-pressure switch 15 for controlling the on and off of the pipe, and a second TDS water quality detector 19 for detecting the water quality of the water filtered by the RO membrane filter 4 in sequence along the water flow direction.

[0047] In this embodiment, a first control valve 18 and a second control valve 19 are respectively provided on the first purified water outlet pipeline 6 and the second purified water outlet pipeline 7 to control the corresponding on-off of the first purified water outlet pipeline and the second purified water outlet pipeline, so as to achieve the purpose of controllable reversal of water supply from the second purified water outlet pipeline or the first purified water outlet pipeline of the water purifier. Preferably, the purified water outlet 20 is set as a water outlet faucet, and the water outlet faucet is provided with two interconnected water inlet joints and a water outlet joint, the two water inlet joints are respectively connected to the first purified water outlet pipeline 6 and the second purified water outlet pipeline 7, and the two water outlet joints are respectively provided with a first control valve 18 and a second control valve 19 for controlling the on-off of the pipeline.

[0048] Example 2

[0049] The difference between this embodiment and the above-mentioned embodiment 1 is that the first TDS water quality detector 11 is arranged on the second purified water outlet pipe 7, and the water quality of the filtered water flowing out of the pre-filter group and into the first purified water outlet pipe 7 is tested, which can also achieve the purpose of effectively testing the water quality of the filtered water of the pre-filter group.

[0050] In this embodiment, a second control valve 19 for controlling the on / off state of the second purified water outlet pipeline 7 is provided on the second purified water outlet pipeline, and a first TDS water quality detector 11 is provided on the upstream pipeline of the second control valve 19 to check the water quality of the water flow upstream of the second control valve, thereby achieving the purpose of still being able to effectively detect the water quality of the water in the second purified water outlet pipeline after the second control valve is closed.

[0051] Example 3

[0052] The difference between this embodiment and the above-mentioned embodiment 1 is that the second TDS water quality detector 12 is arranged on the first purified water outlet pipe 6 to effectively detect the water quality of the filtered water after filtration by the RO membrane filter 4 and post-treatment with the activated carbon filter element, and can also achieve the purpose of effectively detecting the water quality of the filtered water by the RO membrane filter 4.

[0053] In this embodiment, a first control valve 18 for controlling the on / off state of the first purified water outlet pipe 6 is provided, and a second TDS water quality detector 12 is provided on the upstream pipe of the first control valve 18 to check the water quality of the water flow upstream of the first control valve, thereby achieving the purpose of effectively detecting the water quality of the water in the first purified water outlet pipe after the first control valve is closed.

[0054] Example 4

[0055] This embodiment introduces a control method for a water purifier based on any one of the above embodiments one to three. The water purifier includes a pre-filter group, an RO membrane filter, and a post-filter group connected in series along the direction of water flow; the TDS water quality test is performed on the filtered water of the pre-filter group, so that when the corresponding test value of the filtered water of the pre-filter group reaches the set standard value, the filtered water of the pre-filter group is controlled to flow directly out of the water purification outlet of the water purifier.

[0056] Through this method, when the water quality of the pre-filter unit meets the set standard, it flows directly through the water purifier's purified water outlet and is available to users. This avoids the situation where the water filtered by the pre-filter unit still needs to be filtered through the RO membrane filter after the water quality meets the standard. This reduces energy consumption and improves water production efficiency. At the same time, it shortens the use time of the RO membrane filter and extends its service life. Furthermore, the water purifier can operate according to the different water quality of the raw water, filtering the raw water rationally and efficiently, and producing purified water that meets the set water quality standard for users to use through the water purifier's purified water outlet.

[0057] In this embodiment, when the TDS water quality test value of the water filtered by the pre-filter group does not reach the set standard value, the filtered water of the pre-filter group is filtered through the RO membrane filter, and the TDS water quality test of the water filtered by the RO membrane filter is performed again. When the corresponding test value of the water filtered by the RO membrane filter reaches the set standard value, the water filtered by the RO membrane filter is treated by the post-activated carbon filter and then flows out of the purified water outlet of the water purifier.

[0058] like Figure 2 As shown, in this embodiment, the specific working process of the water purifier includes the following steps:

[0059] S1, raw water flows in from the water purifier inlet;

[0060] S2, the raw water is filtered in sequence through a pre-filter group consisting of a first melt-blown polypropylene filter, a granular activated carbon filter, and a second melt-blown polypropylene filter, so that the raw water flowing into the water purifier flows through the first melt-blown polypropylene filter, the granular activated carbon filter, and the second melt-blown polypropylene filter in sequence;

[0061] S3. Perform a TDS water quality test on the filtered water flowing out of the second melt-blown polypropylene filter and after being filtered by the pre-filter group. If the test value reaches the set standard value, execute step S4; otherwise, execute step S5;

[0062] S4. The filtered water after being filtered by the pre-filter group flows directly to the purified water outlet of the water purifier through the second purified water outlet pipe for use by the user as purified water;

[0063] S5, the filtered water after the pre-filter group flows to the RO membrane filter and is filtered by the RO membrane filter;

[0064] S6, performing a TDS water quality test on the filtered water flowing out of the purified water outlet of the RO membrane filter and after filtration by the RO membrane filter again. When the test value reaches the set standard value, executing step S7;

[0065] S7. The filtered water after filtration by the RO membrane filter flows to the post-activated carbon filter. After filtration by the post-activated carbon filter, it flows to the purified water outlet of the water purifier through the first purified water outlet pipe for users to use as purified water.

[0066] In this embodiment, when executing the above step S4, the RO membrane filter stops working, and the purified water outlet of the water purifier is supplied with water only through the second purified water outlet pipe, so as to avoid repeated work of the water purifier and reduce energy consumption.

[0067] Example 5

[0068] This embodiment introduces a method for determining the life of the RO membrane filter element of a water purifier based on any one of the water purifiers in the above-mentioned embodiments one to three. The inlet water quality and outlet water quality of the RO membrane filter are respectively tested, and the test values are compared with preset values to obtain the life information of the OR membrane filter element of the RO membrane filter.

[0069] By detecting the TDS water quality of the inlet and outlet water of the RO membrane filter to determine the life of the RO membrane filter element, the RO membrane life expiration can be quickly and accurately determined. The RO membrane is then alerted to the user in real time by displaying a red alarm on the display panel of the water purifier and continuously sounding a buzzer, indicating that the RO membrane is due for replacement. At the same time, the machine is locked and no longer outputs water, conveniently and intuitively reminding the user that the element needs to be replaced, thereby ensuring the drinking water safety of the water purifier user. The RO membrane filter element service life determination method described in this embodiment can simply and accurately determine the life of the RO membrane filter element, eliminating the cumbersome operating steps of traditional filter element life determination methods, making it more user-friendly and improving the user experience.

[0070] like Figure 3 As shown, in this embodiment, the method for determining the life of the RO membrane filter element of the water purifier specifically includes the following steps:

[0071] S101: Real-time detection of the inlet water quality A1 and outlet water quality A2 of the RO membrane filter;

[0072] S102: Calculate the removal rate of the OR membrane filter element B = (A1-A2) / A1*100%;

[0073] S103: Compare the calculated removal rate B with the set value B'. When B < B', execute step S104; when B ≥ B', the water purifier works normally.

[0074] S104: Determine whether the cumulative time of the removal rate B < the set value B' exceeds the set time. If so, execute step S105; if not, execute step S101 again.

[0075] S105: The service life of the RO membrane filter element of the RO membrane filter expires, and the water purifier sends an RO membrane filter element replacement alarm signal;

[0076] In this embodiment, the life expiration of the RO membrane filter element is determined by detecting the water quality at the water inlet and outlet of the RO membrane filter. This is simple, effective, and highly feasible. When the RO membrane filter element is blocked, the water quality at the water inlet and outlet of the RO membrane filter does not change much. Once the difference between the two is less than a preset value, the water purifier will prompt the user to replace the RO membrane filter element. This not only protects the booster pump and other components of the water purifier from damage, but also ensures that users have access to safe drinking water.

[0077] In this embodiment, when the water purifier executes step S105, the water purifier stops working and is locked, and the water purifier sends an RO membrane filter element replacement alarm signal to the user; the RO membrane filter element replacement alarm signal includes one or a combination of an alarm prompt image, light, and graphic information displayed on the display device of the water purifier, and / or an alarm prompt audio information issued by the audio output device of the water purifier, and / or an alarm push information sent by the water purifier to the user's mobile terminal.

[0078] In this embodiment, when the water purifier executes step S105, the water purifier stops taking in water, the booster pump and the solenoid valve provided on the water purifier are in a closed state, and the control panel of the water purifier is in a locked state.

[0079] In this embodiment, when B ≥ B', the remaining life of the RO membrane filter element is calculated and fed back to the user according to the following formula: Remaining life of the RO membrane filter element = (Removal rate B - Set value B') * Corresponding constant ratio. The remaining life of the RO membrane filter element can vary between a linear line and a nonlinear curve. As the difference in water quality between the inlet and outlet of the RO membrane filter element decreases, the remaining life of the RO membrane filter element gradually decreases until it reaches zero.

[0080] In this embodiment, in step S104, if the removal rate B calculated in real time is consistently less than the set value B' within a continuous time period t, step S105 is executed; and / or, in step S104, if the cumulative time during which the removal rate B calculated in real time is less than the set value B' exceeds the set time value T, step S105 is executed. Preferably, if the removal rate B calculated in real time is greater than the set value B' within a continuous time period t, the duration timer for that time is reset to zero, and the process returns to step S101.

[0081] In step S104, if the removal rate B calculated in real time is greater than the set value B' within the set continuous time period t, the duration timer is reset and the process returns to step S101. Preferably, the set continuous time period t is set to 60 seconds and the set time value T is set to 600 seconds. It should be noted that the preset time is a feasible value set by the technician. In actual application, the preset time may also be other feasible values.

[0082] The processor compares the time during which the removal rate B of the OR membrane filter element remains less than the preset value B' with the preset continuous time period of 60 seconds. If the duration is greater than 60 seconds, the process proceeds to step S105; otherwise, the process returns to step S101 and resets the timer.

[0083] At the same time, the processor will calculate the time when the removal rate B of the OR membrane filter element is less than the preset value B', and compare the accumulated time with the set time value 600s. If the accumulated time is greater than 600s, it will enter step S105, otherwise it will return to step S101 and the water purifier will work normally.

[0084] The above description is merely a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as above in terms of a preferred embodiment, it is not intended to limit the present invention. Any technician familiar with this patent can make slight changes or modifications to equivalent embodiments using the above technical content without departing from the scope of the technical solution of the present invention. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the solution of the present invention.

Claims

1. A control method for a water purifier, comprising a pre-filter group, an RO membrane filter, and a post-filter group connected in series along a water flow direction; characterized in that: Perform TDS water quality testing on the water filtered by the pre-filter group, so that when the corresponding test value of the water filtered by the pre-filter group reaches the set standard value, the filtered water of the pre-filter group is controlled to flow directly out of the water purification outlet of the water purifier; When the TDS water quality test value of the water filtered by the pre-filter group does not reach the set standard value, the filtered water of the pre-filter group is passed through the RO membrane filter for filtration, and the TDS water quality test of the water filtered by the RO membrane filter is performed again. When the corresponding test value of the water filtered by the RO membrane filter reaches the set standard value, the water filtered by the RO membrane filter is treated by the post-activated carbon filter and then flows out of the purified water outlet of the water purifier; The control method further includes: S101: Real-time detection of the inlet water quality A1 and outlet water quality A2 of the RO membrane filter; S102: Calculate the removal rate of the RO membrane filter element B = (A1-A2) / A1*100%; S103: Compare the calculated removal rate B with the set value B'. When B < B', execute step S104; when B ≥ B', the water purifier operates normally. According to the following formula: Remaining life of RO membrane filter element = (removal rate B - set value B') * corresponding constant ratio, the remaining life of RO membrane filter element is output and fed back to the user; S104: Determine whether the cumulative time of the removal rate B < the set value B' exceeds the set time. If so, execute step S105; if not, reset the duration timer and return to step S101; S105: The service life of the RO membrane filter element of the RO membrane filter expires, the water purifier stops taking in water, the booster pump and solenoid valve on the water purifier are in the closed state, the control panel of the water purifier is in the locked state, and the water purifier sends an RO membrane filter element replacement alarm signal.

2. A water purifier control method according to claim 1, characterized in that: The specific working process of the water purifier includes the following steps: S1, raw water flows in from the water purifier inlet; S2, the raw water is filtered in sequence through a pre-filter group consisting of a first melt-blown polypropylene filter, a granular activated carbon filter, and a second melt-blown polypropylene filter, so that the raw water flowing into the water purifier flows through the first melt-blown polypropylene filter, the granular activated carbon filter, and the second melt-blown polypropylene filter in sequence; S3, performing a TDS water quality test on the filtered water flowing out of the second melt-blown polypropylene filter and after being filtered by the pre-filter group. When the test value reaches the set standard value, executing step S4; Otherwise, execute step S5; S4. The filtered water after being filtered by the pre-filter group flows directly to the purified water outlet of the water purifier through the second purified water outlet pipe for use by the user as purified water; S5, the filtered water after the pre-filter group flows to the RO membrane filter and is filtered by the RO membrane filter; S6, performing a TDS water quality test on the filtered water flowing out of the purified water outlet of the RO membrane filter and after filtration by the RO membrane filter again. When the test value reaches the set standard value, executing step S7; S7. The filtered water after filtration by the RO membrane filter flows to the post-activated carbon filter. After filtration by the post-activated carbon filter, it flows to the purified water outlet of the water purifier through the first purified water outlet pipe for users to use as purified water.

3. The control method of a water purifier according to claim 2, characterized in that: When executing the above step S4, the RO membrane filter stops working, and the purified water outlet of the water purifier only supplies water through the second purified water outlet pipeline.

4. A control method for a water purifier according to claim 3, wherein the water purifier comprises a pre-filter group, an RO membrane filter, and a post-filter group connected in series via a pipeline from a water inlet of the water purifier; characterized in that: The purified water outlet of the pre-filter group is connected to the purified water outlet of the water purifier via the second purified water outlet pipe, and the purified water outlet of the post-filter group is connected to the purified water outlet of the water purifier via the first purified water outlet pipe. TDS water quality detectors are respectively provided downstream of the water outlet of the pre-filter group and downstream of the purified water outlet of the RO membrane filter to perform corresponding detection on the water quality of the filtered water of the pre-filter group and the RO membrane filter.

5. The control method of a water purifier according to claim 4, characterized in that: The pre-filter group includes a first melt-blown polypropylene filter, a granular activated carbon filter, and a second melt-blown polypropylene filter which are sequentially connected in series through a pipeline from a water inlet. The filtering accuracy of the first melt-blown polypropylene filter is lower than that of the second melt-blown polypropylene filter.

6. A water purifier control method according to claim 5, characterized in that: The water outlet of the second melt-blown polypropylene filter is connected to the first connecting pipe and the second purified water outlet pipe respectively through a tee, the other end of the first connecting pipe is connected to the RO membrane filter, and the other end of the second purified water outlet pipe is connected to the purified water outlet of the water purifier; the first connecting pipe or the second purified water outlet pipe is provided with a first TDS water quality detector to detect the water quality of the filtered water flowing out of the pre-filter group.

7. A water purifier control method according to claim 6, characterized in that: The water inlet end of the first connecting pipeline is connected to the filtered water outlet of the pre-filter group, and the water outlet end is connected to the water inlet of the RO membrane filter; along the water flow direction, the first connecting pipeline is provided with a low-pressure switch for controlling the on-off of the pipeline, a solenoid valve for controlling the water flow rate in the pipeline, a first TDS water quality detector for detecting the water quality of the filtered water of the pre-filter group, and a booster pump for increasing the pressure of the water flowing into the RO membrane.

8. A water purifier control method according to any one of claims 3 to 7, characterized in that: The post-filter group includes at least a post-activated carbon filter, the water inlet of the post-activated carbon filter is connected to the purified water outlet of the RO membrane filter via a second connecting pipe, and the water outlet of the post-activated carbon filter is connected to the first purified water outlet pipe; a second TDS water quality detector is provided on the second connecting pipe or the first purified water outlet pipe to check the water quality of the filtered water flowing out of the RO membrane filter.

9. A water purifier control method according to claim 8, characterized in that: The concentrated water outlet of the RO membrane filter is connected to the drain pipe of the water purifier, and the purified water outlet of the RO membrane filter is connected to the water inlet of the post-activated carbon filter via a second connecting pipe, and the water outlet of the post-activated carbon filter is connected to the first purified water outlet pipe; a second TDS water quality detector is provided on the second connecting pipe to detect the water quality of the filtered water flowing out of the RO membrane filter.

10. The control method of a water purifier according to claim 9, characterized in that: The water inlet end of the second connecting pipeline is connected to the purified water outlet of the RO membrane filter, and the water outlet end of the second connecting pipeline is connected to the water inlet of the post-filter; along the water flow direction of the second connecting pipeline, there are successively provided a high-pressure switch for controlling the on-off of the pipeline, a check valve for controlling the flow direction of water in the pipeline, and a second TDS water quality detector for detecting the water quality of the water filtered by the RO membrane filter.

Images