Filter element cleaning method of water purifier and water purifier

Abstract

The invention relates to a filter element cleaning method of a water purifier and the water purifier, and the filter element cleaning method comprises the following steps: detecting the pollution degree of a filter element in the water purifier to obtain a pollution index K, and when K is greater than or equal to K1, calculating the firmness of pollutants on the filter element, the cleaning strength, the working voltage U of a booster pump during cleaning and the cleaning time T; then the working voltage of the booster pump is set to be U, the filter element is cleaned, and after the cleaning time reaches T, the current water inlet pressure p of the filter element is recorded; judging whether p is smaller than or equal to a preset maximum pressure value, if so, updating the initial water inlet pressure of the filter element with p; if not, prompting that the filter element needs to be replaced. According to the filter element cleaning method, on the premise that damage to the filter element is reduced as much as possible, the cleaning effect is fully achieved, whether the filter element needs to be replaced or not can be judged, a user is reminded of timely treatment, and maintenance of the water purifier is facilitated.

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 amount of pollution and firmness vary greatly, and a greater cleaning force will also damage the filter material, 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 purified 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 equilibrium and the flushing of the water purification filter element can be stopped, so the flushing time is uncertain, which solves the technical problems existing in the prior art when the flushing time is fixed. However, since the following scenarios do not occur in the actual use of the water purifier, for example: a large amount of sediment is introduced during the maintenance of the water supply network, causing the filter element to accumulate pollutants in a relatively short period of time; and users with better water quality and less water consumption need a longer time to reach the cleaning conditions, which will cause the dirt to deposit on the surface of the filter material into stubborn stains, requiring a higher intensity cleaning mode to be matched, and the above cleaning intensity is uncontrollable, so it is not suitable for the above scenario. For this reason, further improvements to the prior art are needed. 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 firmness of the contaminants on 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 method for cleaning a filter element of a water purifier, the water purifier comprises a water purification pipeline, a cleaning pipeline, a booster pump and a filter element, the booster pump and the filter element are both arranged on the water purification pipeline, and the booster pump is arranged upstream of the filter element, the water inlet end of the cleaning pipeline is connected to the position between the booster pump and the filter element, and the water outlet end of the cleaning pipeline is connected to the filter element, characterized in that:

[0009] The filter element cleaning method of the water purifier comprises the following steps:

[0010] Step 1: Detect the pollution degree of the filter element in the water purifier to obtain the pollution index K, 0≤K≤100%;

[0011] Step 2: Determine whether K is greater than or equal to the preset pollution index K1. If yes, proceed to step 3; if not, proceed to step 1;

[0012] Step 3, calculate the firmness H of the pollutants on the filter element, and calculate the cleaning intensity S based on the firmness H;

[0013] Step 4: Calculate the working voltage U of the booster pump and the cleaning time T during cleaning according to the cleaning intensity S;

[0014] Step 5: Set the working voltage of the booster pump to U, clean the filter element, and after the cleaning time reaches T, record the current filter element inlet pressure p;

[0015] Step 6, determine whether p is less than or equal to the preset maximum pressure value Pmax. If so, update the filter element water inlet initial pressure P0 with the current water inlet pressure p. The initial value of the filter element water inlet initial pressure P0 is the pressure value recorded during the first pressure test, and proceed to step 1; if not, prompt that the filter element needs to be replaced and end.

[0016] In the above scheme, the pollution index K in step 1 is obtained as follows:

[0017]

[0018] Wherein, ΔP is the difference between the currently detected filter element water inlet pressure p and the filter element water inlet initial pressure P0.

[0019] In order to more accurately reflect the degree of contamination of the filter element, the calculation formula of ΔP is:

[0020] ΔP=p′-P0

[0021] Among them, p' is the average value of the water inlet pressure of the filter element currently detected, p j is the filter element water inlet pressure obtained by the jth measurement, n is the total number of measurements, and the input voltage of the booster pump is equal to the set value U0 each time the contamination degree of the filter element is detected.

[0022] In the above scheme, the calculation formula for the firmness H of the pollutants on the filter element in step 3 is:

[0023]

[0024] Among them, t i is the end time of the filter element cleaning for the i-th time, t i-1 is the end time of the filter element cleaning for the i-1th time, and COD(t) is the amount of filter element contamination at time t.

[0025] In the above scheme, the calculation formula of the cleaning intensity S in step 3 is:

[0026] S=a*H

[0027] Where a is the cleaning intensity coefficient.

[0028] In the above scheme, the calculation formula of the working voltage U of the booster pump in step 4 is:

[0029] U=b*S

[0030] Among them, b is the working voltage coefficient of the booster pump during cleaning.

[0031] In the above scheme, the calculation formula of the cleaning time T in step 4 is:

[0032] T=c*S

[0033] Where c is the flushing time coefficient.

[0034] The technical solution adopted by the present invention to solve the above-mentioned second technical problem is: a water purifier, characterized in that: the above-mentioned filter element cleaning method is applied.

[0035] In order to realize the cleaning of the filter element while the water purifier produces water, a two-position three-way valve located upstream of the filter element is 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 connected to the water inlet end of the 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.

[0036] In order to achieve drainage after the filter element is cleaned, a drainage valve is also provided on the drainage pipeline.

[0037] To achieve pressure detection, the water purifier also includes a pressure sensor for detecting the water inlet pressure between the booster pump and the filter element.

[0038] To detect water quality, the water purifier also includes a COD sensor for detecting the amount of contamination between the booster pump and the filter element.

[0039] Compared with the prior art, the advantages of the present invention are: the firmness of the pollutants on the filter element is calculated by the accumulated usage time and the history of incoming water quality, and the cleaning intensity and cleaning time are set accordingly. Therefore, the filter element cleaning method can fully achieve the cleaning effect while minimizing the damage to the filter element, and can also determine whether the filter element needs to be updated, so as to remind the user to deal with it in time, which is convenient for the maintenance of the water purifier. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 This is a water circuit diagram of a filter element cleaning system of a water purifier in an embodiment of the present invention;

[0041] Figure 2 The present invention is a flowchart of a filter element cleaning method for a water purifier according to an embodiment of the present invention. DETAILED DESCRIPTION

[0042] The present invention is further described in detail below with reference to the accompanying drawings.

[0043] like Figure 1As shown, the water purifier in this embodiment includes a water purification pipeline 1, a cleaning pipeline 4, a booster pump 6 and a filter element 2. The booster pump 6 and the filter element 2 are both arranged on the water purification pipeline 1, and the booster pump 6 is arranged upstream of the filter element 2. The water inlet end of the cleaning pipeline 4 is connected to the position between the booster pump 6 and the filter element 2, and the water outlet end of the cleaning pipeline 4 is connected to the filter element 2. The filter element 2 is cleaned using the filter element cleaning method described below.

[0044] A two-position three-way valve 3 located upstream of the filter element 2 is also provided on the clean water pipeline 1. 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 connected to the water inlet end of the cleaning pipeline 4. The filter element 2 is also connected to a drain pipeline 5. 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 as follows: when the first interface 31 is in an open state, the third interface 33 and the second interface 32 are selectively opened.

[0045] In addition, the water purifier also includes a pressure sensor 7 for detecting the water inlet pressure between the booster pump 6 and the filter element 2 and a COD sensor 8 for detecting the amount of pollution between the booster pump 6 and the filter element 2. COD is the chemical oxygen demand (Chemical Oxygen Demand, referred to as COD), which refers to the amount of strong oxidants consumed by reducing substances in the water when the wastewater is treated with strong oxidants under certain conditions. The COD value is detected by the COD sensor to indirectly reflect the amount of pollution.

[0046] The booster pump 6, two-position three-way valve 3, drain valve 51, pressure sensor 7 and COD sensor 8 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).

[0047] The working process of the above water purifier is:

[0048] 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 pressure sensor 7 is not working, and the drain valve 51 is closed;

[0049] 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 pressure sensor 7 and the COD sensor 8 are working, and the drain valve 51 is closed;

[0050] 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.

[0051] like Figure 2As shown, the filter element cleaning method of the water purifier in this embodiment includes the following steps:

[0052] Step 1: 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, and the input voltage of the booster pump is equal to the set value U0 each time the pollution degree of the filter element is detected; this setting is to make the working state of the booster pump the same each time, so that the recorded filter element water inlet pressure p is more comparable and can more accurately reflect the pollution degree of the filter element; and 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, which serves as a reminder; in this embodiment, the interval time is 6 hours, such as Figure 1 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 stabilize the input voltage of the booster pump 6 at U0;

[0054] In this embodiment, the pollution index K is obtained as follows:

[0055]

[0056] Among them, ΔP is the difference between the currently detected filter element water inlet pressure p and the filter element water inlet initial pressure P0;

[0057] The calculation formula of ΔP is:

[0058] ΔP=p′-P0

[0059] Among them, p' is the average value of the water inlet pressure of the filter element currently detected, p j is the filter element water inlet pressure obtained by the jth measurement, and n is the total number of measurements; in this embodiment, n=5;

[0060] Step 2: Determine whether K is greater than or equal to the preset pollution index K1. If yes, proceed to step 3; if not, proceed to step 1;

[0061] Step 3, calculate the firmness H of the pollutants on the filter element, and calculate the cleaning intensity S based on the firmness H;

[0062] The calculation formula for the firmness H of pollutants on the filter element is:

[0063]

[0064] Among them, t i is the end time of the filter element cleaning for the i-th time, t i-1is the end time of the filter element cleaning for the i-1th time, COD(t) is the contamination of the filter element at time t;

[0065] The calculation formula of H is an integral formula. COD(t)dt can be regarded as the accumulated pollution at time dt. i -t) 2 It can be regarded as the pollution generated at time dt to t i The time influence of the cumulative deposition at each moment is used as a multiplier to represent the overall firmness of the dirt, which reflects both the time influence and the deposition amount influence, and the influence of the time factor is stronger, which is a square relationship;

[0066] The calculation formula of cleaning intensity S is:

[0067] S=a*H

[0068] Wherein, a is the cleaning intensity coefficient; the specific value of a is determined according to experimental calibration;

[0069] Step 4: Calculate the working voltage U of the booster pump and the cleaning time T during cleaning according to the cleaning intensity S;

[0070] The calculation formula of the working voltage U of the booster pump is:

[0071] U=b*S

[0072] Wherein, b is the working voltage coefficient of the booster pump during cleaning;

[0073] The calculation formula of cleaning time T is:

[0074] T=c*S

[0075] Where c is the flushing time coefficient;

[0076] The specific values ​​of b and c are confirmed based on experimental calibration;

[0077] Step 5: Set the working voltage of the booster pump to U, clean the filter element, and after the cleaning time reaches T, record the current filter element inlet pressure p;

[0078] Step 6, determine whether p is less than or equal to the preset maximum pressure value Pmax. If so, update the filter element water inlet initial pressure P0 with the current water inlet pressure p. The initial value of the filter element water inlet initial pressure P0 is the pressure value recorded during the first pressure test, and proceed to step 1; if not, prompt that the filter element needs to be replaced and end.

[0079] In this embodiment, the pollution index of the filter element (corresponding to the degree of blockage of the filter element) is calculated by the water inlet pressure of the filter element. 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 and user habits, and the detection method is reliable; secondly, the stubbornness of the dirt on the filter element can be determined by the accumulated usage time and the history of inlet water quality, and the cleaning effect can be fully achieved under the premise of minimizing the damage to the filter element: the COD integral calculation method is adopted to calculate the dirt firmness, and the calculation method takes into account the dual influencing factors of water impurities and time, thereby setting the intensity and time of flushing, avoiding excessive and long flushing while removing scale, and avoiding damaging the filter element; in addition, the above cleaning method fully takes into account the factor that the dirt cannot be completely cleaned, updates P0 after each flushing, and can prompt to replace the filter element according to the maximum pressure value Pmax.

Claims

1. A method for cleaning a filter element of a water purifier, the water purifier comprising a water purification pipeline (1), a cleaning pipeline (4), a booster pump (6) and a filter element (2), the booster pump (6) and the filter element (2) being both arranged on the water purification pipeline (1), and the booster pump (6) being arranged upstream of the filter element (2), the water inlet end of the cleaning pipeline (4) being connected to the position between the booster pump (6) and the filter element (2), and the water outlet end of the cleaning pipeline (4) being connected to the filter element (2), characterized in that: The filter element cleaning method of the water purifier comprises the following steps: Step 1: Detect the pollution degree of the filter element in the water purifier to obtain the pollution index K, 0≤K≤100%; Step 2: Determine whether K is greater than or equal to the preset pollution index K1. If yes, proceed to step 3; if not, proceed to step 1; Step 3, calculate the firmness H of the pollutants on the filter element, and calculate the cleaning intensity S based on the firmness H; Step 4: Calculate the working voltage U of the booster pump and the cleaning time T during cleaning according to the cleaning intensity S; Step 5: Set the working voltage of the booster pump to U, clean the filter element, and after the cleaning time reaches T, record the current filter element inlet pressure p; Step 6, determine whether p is less than or equal to the preset maximum pressure value Pmax. If so, update the filter element water inlet initial pressure P0 with the current water inlet pressure p. The initial value of the filter element water inlet initial pressure P0 is the pressure value recorded during the first pressure test, and proceed to step 1; if not, prompt that the filter element needs to be replaced and end.

2. The filter element cleaning method according to claim 1, characterized in that: The pollution index K in step 1 is obtained as follows: Wherein, ΔP is the difference between the currently detected filter element water inlet pressure p and the filter element water inlet initial pressure P0.

3. The filter element cleaning method according to claim 2, characterized in that: The calculation formula of ΔP is: ΔP=p′-P0 Among them, p' is the average value of the water inlet pressure of the filter element currently detected, p j is the filter element water inlet pressure obtained by the jth measurement, n is the total number of measurements, and the input voltage of the booster pump is equal to the set value U0 each time the contamination degree of the filter element is detected.

4. The filter element cleaning method according to claim 3, characterized in that: The calculation formula for the firmness H of the pollutants on the filter element in step 3 is: Among them, t i is the end time of the filter element cleaning for the i-th time, t i-1 is the end time of the filter element cleaning for the i-1th time, and COS(t) is the amount of filter element contamination at time t.

5. The filter element cleaning method according to claim 4, characterized in that: The calculation formula of the cleaning intensity S in step 3 is: S=a*H Where a is the cleaning intensity coefficient.

6. The filter element cleaning method according to claim 5, characterized in that: The calculation formula of the working voltage U of the booster pump in step 4 is: U=b*S Among them, b is the working voltage coefficient of the booster pump during cleaning.

7. The filter element cleaning method according to claim 6, characterized in that: The calculation formula of the cleaning time T in step 4 is: T=c*S Where c is the flushing time coefficient.

8. A water purifier, characterized in that: The filter element cleaning method according to any one of claims 1 to 7 is applied.

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 connected to the water inlet end of the 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 9, characterized in that: The water purifier further comprises a pressure sensor (7) for detecting the water inlet pressure between the booster pump (6) and the filter element (2).

12. The water purifier according to claim 11, characterized in that: The water purifier further comprises a COD sensor (8) for detecting the amount of contamination between the booster pump (6) and the filter element (2).

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