Filter core cleaning method of water purifier and water purifier

Abstract

The present application relates to a filter cleaning method and a water purifier, the filter cleaning method comprising: detecting the pollution degree of the filter in the water purifier to obtain a pollution index K, and when K is greater than or equal to K1, calculating the firmness of the pollutants on the filter, the cleaning intensity, the working voltage U of the booster pump during cleaning, and the cleaning time T; then setting the working voltage of the booster pump as U, cleaning the filter, and after the cleaning time reaches T, recording the current filter water inlet pressure p; determining whether p is less than or equal to a preset maximum pressure value, if yes, updating p as the initial filter water inlet pressure, and if no, prompting that the filter needs to be replaced. The filter cleaning method can achieve sufficient cleaning effect while minimizing damage to the filter, and can also determine whether the filter needs to be replaced to remind the user to handle it in time, facilitating the maintenance of the water purifier.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of water purification, in particular to a filter core cleaning method of a water purifier and the water purifier. BACKGROUND

[0002] As a water treatment equipment for deep filtration and purification of water quality, the water purifier provides users with higher quality and safer drinking water, and has played an increasingly important role in modern life. The water purifier purifies water through a filter core. Due to the particularity of the use environment, as the use time of the water purifier continuously accumulates or the water quality of the municipal pipe network fluctuates, pollutants will continuously adhere to the surface of the filter core, causing the service life of the filter core to continuously degrade. Especially when there are many impurities in the water quality, the service life and performance of the filter core will quickly degrade, and the filtration effect will also quickly decrease, thereby affecting the use experience of the water purifier.

[0003] In order to solve the cleaning of the filter core of the water purifier, a water purification preparation device and a control method thereof are disclosed in Chinese Patent Application No. CN202211564424.1 (Publication No. CN115845458A). The water purification preparation device includes a return pipe, one end of which is connected to a water inlet pipe, and the other end is connected to a concentrated water pipe. An air inlet assembly is configured to deliver air into the water inlet pipe, the concentrated water pipe, or the return pipe. The water purification preparation device can send air into the water purification preparation device through the air inlet assembly. The water-air mixture formed by the air and the water flows in the loop composed of the water inlet pipe, the water purification pipe, the concentrated water pipe, and the return pipe to flush the water purification filter core.

[0004] However, the filter core in the prior art usually adopts automatic flushing at a fixed time, and the flushing cycle and the flushing time are fixed. Therefore, the prior art has the following use limitations: since the dirt on the surface of the filter core is affected by factors such as water quality, user water frequency, filter material quality, whether a pre-filter is installed, etc., the pollution amount and firmness have large deviations. A large cleaning force will also cause damage to the filter material, affecting the overall service life and filtration efficiency of the filter core. A long cleaning cycle will also affect the filtration effect of the filter core, causing the water quality to deteriorate and affecting the water experience.

[0005] Although the above water purification preparation device can determine whether the turbidity value continues to increase during the flushing process, when the turbidity value no longer increases within the set time, it indicates that the cleaning has reached equilibrium, and the flushing of the water purification filter core can be stopped. Therefore, the flushing time is indefinite, which solves the technical problem of the prior art that the flushing time is fixed. However, since the water purifier does not appear in the following scenarios during actual use, for example: a large amount of silt is introduced during the maintenance of the water supply pipe network, so that the filter core accumulates pollutants in a relatively short time; and users with good water quality and small water consumption need a longer time to reach the cleaning condition, which will cause the deposition of pollutants on the filter surface into stubborn stains, which requires a higher cleaning mode. However, the above cleaning intensity is uncontrollable, and therefore is not suitable for the above scenarios. Therefore, the prior art needs to be further improved. SUMMARY

[0006] The first technical problem to be solved by the present application is to provide a filter core cleaning method for a water purifier, which can automatically match the cleaning intensity and cleaning time according to the firmness of the pollutants on the filter core, so as to ensure the cleaning effect while reducing the loss of the filter core.

[0007] The second technical problem to be solved by the present application is to provide a water purifier applying the filter core cleaning method of the water purifier.

[0008] The technical solution adopted by the present application to solve the above first technical problem is as follows: a filter core cleaning method for a water purifier, the water purifier comprising a water purification pipeline, a cleaning pipeline, a booster pump and a filter core, the booster pump and the filter core are both arranged on the water purification pipeline, and the booster pump is arranged upstream of the filter core, the water inlet end of the cleaning pipeline is connected in communication with the position between the booster pump and the filter core, and the water outlet end of the cleaning pipeline is connected with the filter core, characterized in that:

[0009] The filter core cleaning method for the water purifier comprises the following steps:

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

[0011] Step 2: determining whether K is greater than or equal to a preset pollution index K1, if yes, proceeding to step 3; if no, proceeding to step 1;

[0012] Step 3: calculating the firmness H of the pollutants on the filter core, and calculating the cleaning intensity S according to the firmness H;

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

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

[0015] Step 6, determine whether p is less than or equal to the preset maximum pressure value Pmax, if yes, update the current water inlet pressure p of the filter element as the water inlet initial pressure P0 of the filter element, the initial value of the water inlet initial pressure P0 of the filter element is the pressure value recorded when the pressure test is performed for the first time, and turn to step 1; if no, prompt that the filter element needs to be replaced, and end.

[0016] In the above scheme, the acquisition method of the pollution index K in step 1 is:

[0017]

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

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

[0020] ΔP=p′-P0

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

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

[0023]

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

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

[0026] S=a*H

[0027] Wherein, 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] Wherein, 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] Wherein, c is the flushing time coefficient.

[0034] The technical scheme adopted by the present application to solve the above-mentioned second technical problem is: a water purifier characterized by applying the above-mentioned filter core cleaning method.

[0035] To realize water purification and filter core cleaning at the same time, a two-position three-way valve is further arranged on the water purification pipeline upstream of the filter core, 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 connected with the water purification pipeline respectively, the third interface is connected with the water inlet end of the cleaning pipeline in communication, the filter core is further connected with a drainage pipeline, and the two-position three-way valve is configured to: when the first interface is in an open state, the third interface and the second interface are opened alternatively.

[0036] To realize drainage after filter core cleaning, a drainage valve is further arranged on the drainage pipeline.

[0037] To realize pressure detection, the water purifier further comprises a pressure sensor for detecting the water inlet pressure between the booster pump and the filter core.

[0038] To realize water quality detection, the water purifier further comprises a COD sensor for detecting the pollution amount between the booster pump and the filter core.

[0039] Compared with the prior art, the present application has the advantages that: the firmness of the pollutants on the filter core is calculated by the accumulated use time and the history of the inlet water quality, so as to set the cleaning strength and the cleaning time, so that the filter core cleaning method can achieve sufficient cleaning effect under the premise of minimizing the damage to the filter core, and can also judge whether the filter core needs to be replaced, so as to remind the user to handle in time, and facilitate the maintenance of the water purifier. BRIEF DESCRIPTION OF DRAWINGS

[0040] Figure 1 The water circuit diagram of the filter core cleaning system of the water purifier in the embodiment of the present application;

[0041] Figure 2 The flow chart of the filter core cleaning method of the water purifier in the embodiment of the present application. DETAILED DESCRIPTION

[0042] The present application will be further described in detail below in combination with the embodiments of the drawings.

[0043] As Figure 1As shown, the water purifier in the 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 in communication with a position between the booster pump 6 and the filter element 2, the water outlet end of the cleaning pipeline 4 is connected with the filter element 2, and the filter element 2 is cleaned by using the filter element cleaning method as described below.

[0044] The water purification pipeline 1 is further provided with a two-position three-way valve 3 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 with the water purification pipeline 1, and the third interface 33 is connected in communication with the water inlet end of the cleaning pipeline 4, and the filter element 2 is further connected with a drain pipeline 5, and the drain pipeline 5 is further provided with a drain valve 51, and the drain valve 51 is an electromagnetic valve; 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 opened alternately.

[0045] In addition, the water purifier further 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 pollution amount between the booster pump 6 and the filter element 2. COD is the chemical oxygen demand (Chemical Oxygen Demand, abbreviated as COD), which refers to the amount of strong oxidizing agent consumed by the reduced substances in the wastewater under certain conditions. The COD value is detected by the COD sensor to indirectly reflect the pollution amount.

[0046] The above-mentioned booster pump 6, two-position three-way valve 3, drain valve 51, pressure sensor 7 and COD sensor 8 are all connected with a controller, so that the controller can change different working conditions (corresponding to the normal water production, filter element pollution degree detection and filter element self-cleaning described below) according to different needs of the user.

[0047] The working process of the above-mentioned water purifier is as follows:

[0048] Normal water production: the booster pump 6 works, 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 does not work, and the drain valve 51 is closed;

[0049] Filter element pollution degree detection: the booster pump 6 works, 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 work, and the drain valve 51 is closed;

[0050] Filter element self-cleaning: the booster pump 6 works, 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] As Figure 2The filter core cleaning method of the water purifier in the embodiment includes the following steps as shown in the figure:

[0052] Step 1, detecting the pollution degree of the filter core in the water purifier to obtain a pollution index K, 0≤K≤100%;

[0053] It is set that the pollution degree of the filter core is detected once at the same interval during the non-working time of the water purifier, and the input voltage of the booster pump is equal to the set value U0 each time the pollution degree of the filter core is detected; this setting is to make the working state of the booster pump the same each time, so that the recorded water inlet pressure p of the filter core is more comparable and can more accurately reflect the pollution degree of the filter core; and the pollution index K is displayed on the control panel of the water purifier, so that the user can immediately understand the pollution degree of the filter core and play a reminding role; the interval time in the embodiment is 6 hours, for example, and the pollution degree of the filter core is detected once every 6 hours. Figure 1 As shown in the figure, the pollution degree of the filter core is detected as follows: the booster pump 6 is controlled to work, the first interface 31 and the second interface 32 of the two-way three-way valve 3 are opened, and the third interface 33 of the two-way three-way valve 3 is closed, so that the input voltage of the booster pump 6 is stabilized at U0.

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

[0055]

[0056] Wherein, ΔP is the difference between the current detected water inlet pressure p of the filter core and the initial water inlet pressure P0 of the filter core;

[0057] The calculation formula of ΔP is:

[0058] ΔP=p′-P0

[0059] Wherein, p′ is the average value of the current detected water inlet pressure of the filter core, p j is the water inlet pressure of the filter core obtained by the jth measurement, and n is the total number of measurements; in the embodiment, n=5;

[0060] Step 2, judging whether K is greater than or equal to a preset pollution index K1, if yes, turning to step 3; if no, turning to step 1.

[0061] Step 3, calculating the firmness H of the pollutants on the filter core, and calculating the cleaning strength S according to the firmness H;

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

[0063]

[0064] Wherein, t i is the end time of the ith cleaning of the filter core, and t i-1Let t be the end time of the (i-1)th cleaning of the filter element, and COD(t) be the amount of contamination in the filter element at time t.

[0065] The formula for calculating H is an integral formula. COD(t)dt can be regarded as the cumulative amount of pollution at time dt. i -t) 2 This can be viewed as pollution generated at time dt up to time t. i The cumulative effect of deposition over time is multiplied by the amount of deposition to characterize the overall firmness of the dirt. This reflects both the effect of time and the amount of deposition, with the time factor having a stronger influence, exhibiting a squared relationship.

[0066] The formula for calculating the cleaning intensity S is:

[0067] S = a * H

[0068] Where 'a' is the cleaning intensity coefficient; the specific value of 'a' is determined based on experimental calibration.

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

[0070] The formula for calculating the operating voltage U of the booster pump is:

[0071] U = b * S

[0072] Where b is the operating voltage coefficient of the booster pump during cleaning;

[0073] The formula for calculating the cleaning time T is:

[0074] T = c * S

[0075] Where c is the rinsing time coefficient;

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

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

[0078] Step 6: Determine if p is less than or equal to the preset maximum pressure value Pmax. If so, update the filter cartridge inlet initial pressure P0 with the current inlet pressure p. The initial value of the filter cartridge inlet initial pressure P0 is the pressure value recorded when the pressure test was first conducted, and proceed to step 1. If not, prompt that the filter cartridge needs to be replaced and end.

[0079] In the embodiment, the pollution index of the filter core (corresponding to the clogging degree of the filter core) is calculated by the water inlet pressure of the filter core. The pollution index is indirectly detected, the structure of the filter core is not damaged, too many redundant structures are not added, the detection method is not affected by water pressure fluctuations and user habits, and the detection method is reliable. In addition, the stubborn degree of dirt of the filter core can be determined according to the accumulated use time and the history of the inlet water quality, so that the cleaning effect is fully achieved under the premise of reducing the damage to the filter core as much as possible. The COD integral calculation method is used to calculate the dirt firmness. The calculation method considers the double influence factors of water impurities and time, so as to set the strength and time of the flushing. The dirt is removed, and the flushing is avoided to be too strong and too long, so as to avoid damaging the filter core. In addition, the above cleaning method fully considers that the dirt cannot be completely cleaned. P0 is updated after each flushing, and the filter core can be replaced according to the maximum pressure value Pmax.

Claims

1. A filter cleaning method for a water purifier, the water purifier comprising a water purification pipeline (1), a cleaning pipeline (4), a booster pump (6) and a filter (2), the booster pump (6) and the filter (2) are both arranged on the water purification pipeline (1), and the booster pump (6) is arranged upstream of the filter (2), the water inlet end of the cleaning pipeline (4) is connected to a position between the booster pump (6) and the filter (2), and the water outlet end of the cleaning pipeline (4) is connected to the filter (2), characterized in that: the filter cleaning method for the water purifier comprises the following steps: Step 1: detecting the pollution degree of the filter in the water purifier to obtain a pollution index K, 0≤K≤100%; The pollution index K is obtained in the following manner: Step 2: determining whether K is greater than or equal to a preset pollution index K1, if yes, proceeding to step 3; if no, proceeding to step 1; ； wherein, is a difference between the current detected filter inlet water pressure p and the filter inlet water initial pressure ; and is a preset maximum pressure value. Step 3: calculating the firmness H of the pollutants on the filter, and calculating the cleaning intensity S according to the firmness H; The formula for calculating the firmness H of the pollutants on the filter is: Step 4: calculating the working voltage U of the booster pump and the cleaning time T according to the cleaning intensity S; H = wherein, is the first cleaning end time of the filter element, is the second cleaning end time of the filter element, is the first cleaning end time of the filter element, is the second cleaning end time of the filter element, is the filter element pollution amount at time t; Step 5: setting the working voltage of the booster pump to U, cleaning the filter, and recording the current filter water inlet pressure p when the cleaning time reaches T. The formula for calculating the cleaning intensity S in step 3 is: Step 6, judge whether p is less than or equal to preset maximum pressure value If yes, update the current water inlet pressure p to the filter water inlet initial pressure , the initial value of the filter water inlet initial pressure is the pressure value recorded when the pressure test is performed for the first time, and go to step 1; if no, prompt that the filter needs to be replaced, and end.

2. The filter cartridge cleaning method of claim 1, wherein: The calculation formula is: in, This represents the average value of the currently detected inlet water pressure of the filter element. , For the first The filter cartridge inlet pressure is obtained from each measurement, where n is the total number of measurements. The input voltage of the booster pump is equal to the set value U0 each time the filter cartridge is tested for contamination.

3. The filter cartridge cleaning method of claim 2, wherein: S = a * H Wherein, a is the cleaning intensity coefficient. The formula for calculating the working voltage U of the booster pump in step 4 is:

4. The filter cartridge cleaning method of claim 3, wherein: U = b * S Wherein, b is the working voltage coefficient of the booster pump during cleaning. The formula for calculating the cleaning time T in step 4 is:

5. The filter cartridge cleaning method of claim 4, wherein: T = c * S Wherein, c is the cleaning time coefficient. The filter cleaning method according to any one of claims 1-5 is applied.

6. A water purifier characterized by comprising: The water purification pipeline (1) further comprises a two-position three-way valve (3) arranged upstream of the filter (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 water purification pipeline (1), and the third interface (33) is connected to the water inlet end of the cleaning pipeline (4), the filter (2) is further connected to a drain pipeline (5), and 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 opened alternately.

7. The water purifier according to claim 6, characterized in that: The drain pipeline (5) further comprises a drain valve (51).

8. The water purifier according to claim 7, 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 (2).

9. The water purifier according to claim 7, characterized in that: The water purifier further comprises a COD sensor (8) for detecting the pollution amount between the booster pump (6) and the filter (2).

10. The water purifier according to claim 9, characterized in that: ​

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