Filter element cleaning method of water purifier and water purifier

Abstract

The filter element cleaning method comprises the following steps: recording the corresponding moment when the water purifier is powered on for the first time, detecting the pollution degree of a filter element in the water purifier to obtain a pollution index K, when K is greater than or equal to K1, obtaining the current accumulated time length T, and when T is greater than or equal to T0, obtaining the current accumulated time length T; the filter element is cleaned according to the first preset cleaning strength X1; on the contrary, the filter element is cleaned according to the second preset cleaning strength X2; after the filter element is cleaned for the corresponding time, the pollution index is obtained again, when K is smaller than or equal to K2, filter element cleaning is stopped, the pollution index K and the accumulated duration T are both set to be zero, the current moment is recorded, and timing is started from the current moment; according to the method, the cleaning strength and the cleaning time can be automatically matched according to the pollution degree of the filter element, the stubborn degree of dirt of the filter element can be judged according to the accumulated cleaning interval duration, and the cleaning effect is fully achieved on the premise that damage to the filter element is reduced as much as possible.

Description

Technical Field

[0001] The present invention relates to the technical field of water purification, and in particular to a filter element cleaning method of a water purifier and a water purifier. Background Art

[0002] As a water treatment device that deeply filters and purifies water, water purifiers provide users with higher quality and safer drinking water, and have played an increasingly important role in modern life. In water purifiers, water is purified through filter elements. Due to the particularity of the use environment, as the use time of the water purifier continues to accumulate or the water quality of the municipal pipe network fluctuates, pollutants will continue to adhere to the surface of the filter element, causing the service life of the filter element to continue to decline. Especially when there are more impurities in the water, the life and performance of the filter element will decline rapidly, and the filtering effect will also decline quickly, thus affecting the user experience of the water purifier.

[0003] In order to solve the problem of cleaning the filter element of the water purifier, a Chinese invention patent with application number CN202211564424.1 (application publication number CN115845458A) discloses a clean water preparation device and a control method thereof, wherein the clean water preparation device includes a return pipe, one end of which is connected to the water inlet pipe and the other end is connected to the concentrated water pipe; the air intake assembly is configured to deliver air to the water inlet pipe, the concentrated water pipe or the return pipe. The clean water preparation device can deliver air into the clean water preparation device through the air intake assembly, and the water-gas mixture formed by air and water flows in a loop composed of the water inlet pipe, the clean water pipe, the concentrated water pipe and the return pipe to flush the clean water filter element.

[0004] However, the filter element in the prior art usually adopts timed automatic flushing, and the flushing cycle and flushing time are fixed, so the prior art has the following limitations: since the dirt on the surface of the filter element is affected by factors such as the quality of the incoming water, the user's water use frequency, the material of the filter material, whether a pre-filter is installed, etc., the adhesion degree and adhesion time of the filter element pollution have large deviations, and frequent cleaning and greater cleaning intensity will also cause damage to the filter element, affecting the overall life and filtration efficiency of the filter element; a cleaning cycle that is too long will affect the filtration effect of the filter element, deteriorate the water quality, and affect the water use experience.

[0005] Although the above-mentioned pure water preparation device will determine whether the turbidity value continues to increase during the flushing process, when the turbidity value no longer increases within the set time, it means that the cleaning has reached a balance and the flushing of the water purification filter element can be stopped. Therefore, the flushing time is uncertain, which solves the technical problems existing in the prior art when the flushing time is fixed. However, the filter element cleaning force of the above-mentioned pure water preparation device is uncontrollable. Therefore, it is necessary to further improve the prior art. Summary of the invention

[0006] The first technical problem to be solved by the present invention is to provide a filter element cleaning method for a water purifier based on the above-mentioned prior art, which can automatically match the cleaning intensity and cleaning time according to the degree of contamination of the filter element to ensure the cleaning effect while reducing the loss of the filter element.

[0007] The second technical problem to be solved by the present invention is to provide a water purifier using the filter element cleaning method of the water purifier.

[0008] The technical solution adopted by the present invention to solve the above-mentioned first technical problem is: a filter element cleaning method for a water purifier, characterized by comprising the following steps:

[0009] Step 1: Record the time when the water purifier is powered on for the first time;

[0010] Step 2: Detect the pollution degree of the filter element in the water purifier to obtain the pollution index K, 0≤K≤100%;

[0011] Step 3: Determine whether K is greater than or equal to the first preset pollution index K1. If yes, proceed to step 4; if no, proceed to step 9;

[0012] Step 4, obtain the current accumulated time T, and determine whether T is greater than or equal to the preset time threshold T0. If so, clean the filter element according to the first preset cleaning intensity X1, and proceed to step 5; if not, clean the filter element according to the second preset intensity X2, and proceed to step 7; X1>X2;

[0013] Step 5: After the filter element cleaning reaches the preset first time t1, the pollution index K of the filter element is obtained again;

[0014] Step 6, determine whether K is less than or equal to the second preset pollution index K2, if yes, turn off the filter element cleaning and go to step 9; if no, continue to clean the filter element at the first cleaning intensity and go to step 5; K2<K1;

[0015] Step 7: After the filter element is cleaned for a preset second time t2, the pollution index K of the filter element is obtained again;

[0016] Step 8, determine whether K is less than or equal to the second preset pollution index K2, if so, turn off the filter element cleaning and go to step 9; if not, continue to clean the filter element at the second cleaning intensity and go to step 7;

[0017] Step 9: Set the pollution index K and the accumulated duration T to zero, record the current time, start timing from the current time, and proceed to step 2.

[0018] In the above scheme, the pollution index of the filter element in step 2 is obtained as follows:

[0019]

[0020] Among them, ΔP is the absolute value of the difference between the filter element water outlet pressure and the filter element water inlet pressure, and P0 is the absolute value of the pressure difference when the filter element filtering effect cannot meet the set requirements. Since the filter element pollution will affect the filter element filtering effect, and the worse the filter element filtering effect, the smaller the filter element water outlet, so the filter element water inlet pressure and water outlet pressure can be used to judge the degree of filter element pollution.

[0021] In order to more accurately reflect the degree of contamination of the filter element, the calculation formula of ΔP is:

[0022] ΔP=|P1-p′|

[0023] Among them, P1 is the water inlet pressure of the filter element, p' is the average water outlet pressure of the filter element, p i is the filter element outlet water pressure obtained by the i-th measurement, n is the total number of measurements, and the filter element inlet water pressure P1 is equal to the set value a each time the filter element pollution degree is detected. In this way, error interference is eliminated by calculating the average value, thereby improving accuracy.

[0024] In order to avoid interfering with the use of the water purifier, in step 2, it is set that the pollution degree of the filter element is detected once at the same interval during the non-working time of the water purifier.

[0025] In order to clean the water purifier when it has not been used for a long time, the step 4 further includes the following steps before determining the size between T and T0:

[0026] Step 4-1, determine whether T is greater than the maximum preset time T1, T1>T0, if yes, then go to step 4-2; if not, then execute step 4 to determine the size of T and T0;

[0027] Step 4-2, determine whether K is greater than or equal to the third preset pollution index K3, K2<K3<K1, if so, clean the filter element according to the second preset intensity X2, and proceed to step 7; if not, continue to accumulate time T.

[0028] In order to automatically match the cleaning time according to the degree of contamination of the filter element, the calculation formula of t1 in step 5 is:

[0029] t1=a*T0+b*(T-T0)

[0030] Wherein, a is the first pollution stubbornness coefficient, b is the second pollution stubbornness coefficient, and both a and b are determined by calibration of experimental data.

[0031] Furthermore, the calculation formula of t2 in step 5 is: t2=a*T.

[0032] The technical solution adopted by the present invention to solve the above-mentioned second technical problem is: a water purifier, including a water purification pipeline and a filter element arranged on the water purification pipeline, characterized in that: the filter element is cleaned by the filter element cleaning method as described in any one of claims 1 to 7 above.

[0033] In order to realize the cleaning of the filter element while producing water from the water purifier, a two-position three-way valve located upstream of the filter element is also provided on the water purification pipeline, and the two-position three-way valve has a first interface, a second interface and a third interface, the first interface and the second interface are respectively connected to the water purification pipeline, the third interface is also connected to the filter element through a cleaning pipeline, the filter element is also connected to a drainage pipeline, and the two-position three-way valve is configured: when the first interface is in an open state, the third interface and the second interface are selectively opened.

[0034] In order to achieve drainage after the filter element is cleaned, a drainage valve is also provided on the drainage pipeline.

[0035] In the above solution, the clean water pipeline is also provided with a booster pump located upstream of the two-position three-way valve.

[0036] Furthermore, the water purifier also includes a first pressure sensor for detecting the water inlet pressure between the booster pump and the filter element and a second pressure sensor for detecting the water outlet pressure of the filter element.

[0037] Compared with the prior art, the advantages of the present invention are: by calculating the pollution index of the filter element, and when the pollution index is greater than the first preset pollution index, the relationship between the accumulated time and the preset time threshold is compared, so that the filter element is cleaned according to different cleaning intensities, and different cleaning intensities correspond to different cleaning times, and the pollution index of the filter element is judged again to turn off the filter element cleaning or continue cleaning. Therefore, the filter element cleaning method can automatically match the cleaning intensity and cleaning time according to the degree of pollution of the filter element, and can judge the stubbornness of the filter element dirt through the accumulated cleaning interval time, and fully achieve the cleaning effect under the premise of minimizing the damage to the filter element. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 This is a water circuit diagram of a water purifier in an embodiment of the present invention;

[0039] Figure 2 This is a flow chart of a filter element cleaning method for a water purifier in an embodiment of the present invention;

[0040] Figure 3 4 is a flow chart of the contamination degree detection of the filter element in an embodiment of the present invention. DETAILED DESCRIPTION

[0041] The present invention is further described in detail below with reference to the accompanying drawings.

[0042] like Figure 1 As shown, the water purifier in this embodiment includes a water purification pipeline 1 and a filter element 2 arranged on the water purification pipeline 1, and the filter element 2 is cleaned using the filter element cleaning method as described above and below.

[0043] The clean water pipeline 1 is also provided with a two-position three-way valve 3 located upstream of the filter element 2 and a booster pump 6 located upstream of the two-position three-way valve 3. The two-position three-way valve 3 has a first interface 31, a second interface 32 and a third interface 33. The first interface 31 and the second interface 32 are respectively connected to the clean water pipeline 1, and the third interface 33 is also connected to the filter element 2 through a cleaning pipeline 4. The filter element 2 is also connected to a drain pipeline 5, and a drain valve 51 is also provided on the drain pipeline 5. The drain valve 51 adopts a solenoid valve; the two-position three-way valve 3 is configured: when the first interface 31 is in an open state, the third interface 33 and the second interface 32 are selectively opened.

[0044] In addition, the water purifier also includes a first pressure sensor 71 for detecting the water inlet pressure between the booster pump 6 and the filter element 2 and a second pressure sensor 72 for detecting the water outlet pressure of the filter element 2. In this way, the first pressure sensor 71 and the second pressure sensor 72 detect the filter element water inlet pressure and the filter element water outlet pressure to calculate the filter element pollution index.

[0045] The above-mentioned booster pump 6, two-position three-way valve 3, drain valve 51, first pressure sensor 71 and second pressure sensor 72 are all connected to the controller, so that the controller can change different working conditions according to different needs of users (corresponding to the normal water production, filter element contamination degree detection and filter element self-cleaning described below).

[0046] The working process of the above water purifier is:

[0047] Normal water production: the booster pump 6 is working, the first interface 31 and the second interface 32 of the two-position three-way valve 3 are open, the third interface 33 is closed, the first pressure sensor 71 and the second pressure sensor 72 are not working, and the drain valve 51 is closed;

[0048] Filter element contamination degree detection: the booster pump 6 is working, the first interface 31 and the second interface 32 of the two-position three-way valve 3 are opened, the third interface 33 is closed, the first pressure sensor 71 and the second pressure sensor 72 are working and feed back the detected pressure values ​​to the controller, and the drain valve 51 is closed;

[0049] Filter element self-cleaning: the booster pump 6 is working, the first interface 31 and the third interface 33 of the two-position three-way valve 3 are opened, the second interface 32 is closed, and the drain valve 51 is opened.

[0050] like Figure 2 As shown, the filter element cleaning method of the water purifier in this embodiment includes the following steps:

[0051] Step 1: Record the time when the water purifier is powered on for the first time;

[0052] Step 2: Detect the pollution degree of the filter element in the water purifier to obtain the pollution index K, 0≤K≤100%;

[0053] It is set that during the non-working hours of the water purifier, the pollution degree of the filter element is detected once at the same interval. Each time the pollution degree of the filter element is detected, the water inlet pressure of the filter element is controlled to be equal to the set value a. This setting is to make the water inlet pressure of the filter element the same each time, so that the recorded pressure difference ΔP is more comparative and can more accurately reflect the pollution degree of the filter element. In addition, by displaying the pollution index K on the control panel of the water purifier, the user can immediately understand the pollution degree of the filter element and play a reminder role. In this embodiment, the interval time is 6 hours. Figure 3 As shown, the specific detection method of the contamination degree of the filter element is: control the booster pump 6 to work, open the first interface 31 and the second interface 32 of the two-position three-way valve 3, close the third interface 33 of the two-position three-way valve 3, and adjust the working current of the booster pump 6 to make the filter element water inlet pressure P1 equal to the set value a;

[0054] The pollution index of the filter element is obtained as follows:

[0055]

[0056] Among them, ΔP is the absolute value of the difference between the filter element water outlet pressure and the filter element water inlet pressure, and P0 is the absolute value of the pressure difference when the filter element filtering effect cannot meet the set requirements; the calculation formula of ΔP is:

[0057] ΔP=|P1-p′|

[0058] Among them, P1 is the water inlet pressure of the filter element, p' is the average water outlet pressure of the filter element, p i is the filter element outlet water pressure obtained by the i-th measurement, and n is the total number of measurements. Due to the fluctuation of the filter element inlet water pressure, the filter element outlet water pressure is recorded every 5 seconds, so that the error effect can be reduced by taking the average value;

[0059] In this embodiment, the pollution index of the filter element (corresponding to the degree of blockage of the filter element) is calculated by the pressure difference. Indirect detection is adopted, which does not damage the structural parts of the filter element, does not add too much redundant structure, is not affected by water pressure fluctuations, booster pump performance and user habits, and the detection method is reliable; the power source during the detection directly adopts the booster pump structure of the water purifier, and no new power source is introduced; the pollution degree adopts the n-point mean method to prevent the pressure cycle fluctuation of the booster pump from affecting the test deviation, and during the test, the voltage and current of the booster pump are adjusted by the controller to keep the water inlet pressure of the filter element constant, so that the test conditions of each K value detection are the same, and the error is further eliminated;

[0060] Step 3, determine whether K is greater than or equal to the first preset pollution index K1, if yes, proceed to step 4; if no, proceed to step 9; the first preset pollution index K1 can be confirmed according to experiments, and in this embodiment, K1 can be a value equal to or close to 100%;

[0061] Step 4, obtain the current accumulated time T, and determine whether T is greater than or equal to the preset time threshold T0. If so, clean the filter element according to the first preset cleaning intensity X1, and proceed to step 5; if not, clean the filter element according to the second preset intensity X2, and proceed to step 7; X1>X2;

[0062] In this embodiment, two cleaning modes can be set, namely, a strong cleaning mode and a general cleaning mode. The strong cleaning mode corresponds to a cleaning mode of a first preset cleaning intensity X1, and the general cleaning mode corresponds to a cleaning mode of a second preset intensity X2. The specific values ​​of X1 and X2 can be obtained based on experimental confirmation. The above-mentioned preset time threshold T0 can be confirmed based on the user's usage habits.

[0063] Step 5: After the filter element cleaning reaches the preset first time t1, the pollution index K of the filter element is obtained again;

[0064] In this embodiment, the calculation formula of t1 is:

[0065] t1=a*T0+b*(T-T0)

[0066] Wherein, a is the first pollution stubbornness coefficient, b is the second pollution stubbornness coefficient, and both a and b are determined by calibration of experimental data;

[0067] Step 6, determine whether K is less than or equal to the second preset pollution index K2, if so, turn off the filter element cleaning and go to step 9; if not, continue to clean the filter element with the first cleaning intensity and go to step 5; K2 < K1; in this embodiment, K2 = 5%, K1 = 100%;

[0068] Step 7: After the filter element is cleaned for a preset second time t2, the pollution index K of the filter element is obtained again;

[0069] In this embodiment, the calculation formula of t2 is: t2 = a*T;

[0070] Step 8, determine whether K is less than or equal to the second preset pollution index K2, if so, turn off the filter element cleaning and go to step 9; if not, continue to clean the filter element at the second cleaning intensity and go to step 7;

[0071] Step 9: Set the pollution index K and the accumulated duration T to zero, record the current time, start timing from the current time, and proceed to step 2.

[0072] After the water purifier has been used for a period of time, it may not be used for a long time. At this time, the surface pollution of the water purifier filter will not continue to increase, and the K value will not reach 100%, but as time goes by, the accumulated dirt will gradually solidify and become stubborn dirt, which will be difficult to clean. Therefore, before judging the size between T and T0 in step 4, the following steps are also included:

[0073] Step 4-1, determine whether T is greater than the maximum preset time T1, T1>T0, if yes, then go to step 4-2; if not, then execute step 4 to determine the size of T and T0;

[0074] Step 4-2, determine whether K is greater than or equal to the third preset pollution index K3, K2<K3<K1, if so, clean the filter element according to the second preset intensity X2, and proceed to step 7; if not, continue to accumulate time T.

[0075] In this embodiment, T1 is 30 days; K3 = 20%; therefore, when T exceeds 30 days, the pollution level detection is triggered; when the detected pollution level K≥20%, cleaning is automatically triggered, and the cleaning mode is the same as the above, using general cleaning intensity; cleaning is triggered only when T≥30 days and K≥20% are met, and other situations are the same as the daily working mode.

[0076] The cleaning method in this embodiment fully considers the fact that the dirt cannot be completely cleaned, sets the last cleaning result as the initial value of the K value, and sets the pollution degree to zero, so that the pollution degree each time will increase by a maximum of K2 (5%) compared to the last time. The pollution degree is convergent under such calculation, that is, under the same conditions, the time for the filter element to reach the next cleaning will become shorter and shorter, which is also in line with the general loss law of the filter element. In addition, during the cleaning process, the stubbornness of the dirt on the filter element can be judged by the accumulated cleaning interval time, and the cleaning effect can be fully achieved under the premise of minimizing the damage to the filter element. And if the pollution degree of the timing filter element does not increase for a long time, it will also be cleaned to avoid stubborn deposition of pollutants.

Claims

1. A method for cleaning a filter element of a water purifier, characterized in that The steps include: Step 1: Record the time when the water purifier is powered on for the first time; Step 2: Detect the pollution degree of the filter element in the water purifier to obtain the pollution index K, 0≤K≤100%; Step 3: determine whether K is greater than or equal to the first preset pollution index K1, if so, proceed to step 4; If not, go to step 9; Step 4, obtain the current accumulated time T, and determine whether T is greater than or equal to the preset time threshold T0. If so, clean the filter element according to the first preset cleaning intensity X1, and proceed to step 5; if not, clean the filter element according to the second preset intensity X2, and proceed to step 7; X1>X2; Step 5: After the filter element cleaning reaches the preset first time t1, the pollution index K of the filter element is obtained again; Step 6: Determine whether K is less than or equal to the second preset pollution index K2. If so, turn off the filter element cleaning and proceed to step 9; if not, continue to clean the filter element at the first cleaning intensity and proceed to step 5; K2<K1; Step 7: After the filter element is cleaned for a preset second time t2, the pollution index K of the filter element is obtained again; Step 8, determine whether K is less than or equal to the second preset pollution index K2, if so, turn off the filter element cleaning and go to step 9; if not, continue to clean the filter element at the second cleaning intensity and go to step 7; Step 9: Set the pollution index K and the accumulated duration T to zero, record the current time, start timing from the current time, and proceed to step 2.

2. The filter element cleaning method according to claim 1, characterized in that: The pollution index of the filter element in step 2 is obtained by: Among them, ΔP is the absolute value of the difference between the filter element water outlet pressure and the filter element water inlet pressure, and P0 is the absolute value of the pressure difference when the filtering effect of the filter element cannot meet the set requirements.

3. The filter element cleaning method according to claim 2, characterized in that: The calculation formula of ΔP is: ΔP=|P1-p′| Among them, P1 is the water inlet pressure of the filter element, p' is the average water outlet pressure of the filter element, p i is the filter element outlet water pressure obtained by the ith measurement, n is the total number of measurements, and the filter element inlet water pressure P1 is equal to the set value a each time the contamination degree of the filter element is detected.

4. The filter element cleaning method according to claim 3, characterized in that: In the step 2, it is set that during the non-working hours of the water purifier, the pollution degree of the filter element is detected once at the same interval.

5. The filter element cleaning method according to any one of claims 1 to 4, characterized in that: Before determining the size between T and T0 in step 4, the following steps are also included: Step 4-1, determine whether T is greater than the maximum preset time T1, T1>T0, if yes, then go to step 4-2; if not, then execute step 4 to determine the size of T and T0; Step 4-2, determine whether K is greater than or equal to the third preset pollution index K3, K2<K3<K1, if so, clean the filter element according to the second preset intensity X2, and proceed to step 7; if not, continue to accumulate time T.

6. The filter element cleaning method according to claim 5, characterized in that: The calculation formula of t1 in step 5 is: t1=a*T0+b*(T-T0) Wherein, a is the first pollution stubbornness coefficient, b is the second pollution stubbornness coefficient, and both a and b are determined by calibration of experimental data.

7. The filter element cleaning method according to claim 6, characterized in that: The calculation formula of t2 in step 5 is: t2=a*T.

8. A water purifier, comprising a water purification pipeline (1) and a filter element (2) arranged on the water purification pipeline (1), characterized in that: The filter element (2) is cleaned using the filter element cleaning method described in any one of claims 1 to 7.

9. The water purifier according to claim 8, characterized in that: The clean water pipeline (1) is also provided with a two-position three-way valve (3) located upstream of the filter element (2); the two-position three-way valve (3) has a first interface (31), a second interface (32) and a third interface (33); the first interface (31) and the second interface (32) are respectively connected to the clean water pipeline (1); the third interface (33) is also connected to the filter element (2) via a cleaning pipeline (4); the filter element (2) is also connected to a drainage pipeline (5); the two-position three-way valve (3) is configured such that: when the first interface (31) is in an open state, the third interface (33) and the second interface (32) are selectively opened.

10. The water purifier according to claim 9, characterized in that: The drainage pipeline (5) is also provided with a drainage valve (51).

11. The water purifier according to claim 10, characterized in that: The clean water pipeline (1) is also provided with a booster pump (6) located upstream of the two-position three-way valve (3).

12. The water purifier according to claim 11, characterized in that: The water purifier further comprises a first pressure sensor (71) for detecting the water inlet pressure between the booster pump (6) and the filter element (2), and a second pressure sensor (72) for detecting the water outlet pressure of the filter element (2).

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