A method for judging the service life of a resin-type water purification filter element

Abstract

The present invention provides a method for judging the service life of a resin-type water purification filter element. When evaluating the service life of the resin-type water purification filter element, the above method presets the threshold value of the change in the electrical signal before and after the preset water sample passes through the resin-type water purification filter element, and uses this as a consideration index for judging whether the water purification filter element reaches the service life, so that the remaining service life of the water purification filter element is directly related to the change amount of the electrical signal of the water sample by the water purification filter element. Taking the electrical signal of the water sample as the object of data collection, the collection of electrical signal data is convenient to implement, without involving the use of titrants and pre-calibration operations, and has low requirements for hardware equipment, and has the advantages of simple operation, high reliability, and environmental protection.

Description

Technical Field

[0001] The present invention belongs to the technical field of water purification, and specifically relates to a method for judging the service life of a resin-type water purification filter element. Background Art

[0002] Currently, generally, the service life of a water purification filter element is tested in a laboratory, and the obtained service life value is used as the standard service life of the same type of filter element. In the actual application of the filter element, a timer is usually used to calculate the actual service duration of the filter element in use. When the service duration reaches the standard service life, a prompt to replace the filter element is given. Generally, the standard service life of the filter element is set to 1 month. However, the water quality in different regions is different, and the service life of the filter jug filter element is also different. In areas with good water quality, the filter jug filter element can be used for up to 6 months without frequent replacement. If the water purification filter element is replaced too frequently, it will not only cause waste of the water purification filter element and increase the cost of water purification, but also add many unnecessary cumbersome operations during the use of the product using the water purification filter element. In regions where the water quality is alkaline and hard, the water purification filter element has no effect after about 1 month of use, and a new water purification filter element needs to be replaced in time. If a new water purification filter element is not replaced in time, the water purification filter element that has lost its water purification ability cannot ensure that the water sample passing through it can achieve a qualified water purification effect. In view of this, it is particularly important to propose an effective and reliable method for judging the service life of a water purification filter element. Summary of the Invention

[0003] The purpose of the present invention is to provide a method for judging the service life of a resin-type water purification filter element to accurately judge the replacement time of the resin-type water purification filter element.

[0004] According to one aspect of the present invention, a method for judging the service life of a resin-type water purification filter element is provided, including a threshold presetting step, an electrical signal detection step, an electrical signal comparison step, and a service life judgment step; the threshold presetting step: preset a first threshold and a second threshold, where the first threshold refers to the change threshold of the electrical signal of the water sample, and the second threshold refers to the limit value of the service life of the water sample; the electrical signal detection step: detect the numerical value of the electrical signal of the water sample before and after the water sample passes through the resin-type water purification filter element, and calculate the change value of the electrical signal of the water sample accordingly; the electrical signal comparison step: compare the change value of the electrical signal with the first threshold; if the change value of the electrical signal is lower than the first threshold, the service life judgment step is executed; if the change value of the electrical signal is higher than the first threshold, a judgment is made that the resin-type water purification filter element can continue to be used; the service life judgment step: compare the actual service duration of the resin-type water purification filter element with the second threshold; if the actual service duration is higher than the second threshold, a judgment is made that the resin-type water purification filter element needs to be replaced; if the actual service duration is lower than the second threshold, the electrical signal comparison step of the water sample is executed again.

[0005] When evaluating the service life of a resin-type water purification filter element, the present invention presets the threshold value of the change in the electrical signal before and after the preset water sample passes through the resin-type water purification filter element, and uses this as a consideration index for judging whether the water purification filter element has reached the service life. As a result, the remaining service life of the water purification filter element is directly related to the change in the electrical signal of the water sample by the water purification filter element. Taking the electrical signal of the water sample as the data collection object, the collection of electrical signal data is convenient to implement, without involving the use of titrants and pre-calibration operations, and has low requirements for hardware equipment, and has the advantages of simple operation, high reliability, and environmental friendliness. It should be noted that the change in the electrical signal before and after the water sample passes through the filter element reflects the actual water purification ability of the water purification filter element. Therefore, the judgment method provided by the present invention can actually evaluate the real-time water purification ability of the water purification filter element, and thus can flexibly and reliably confirm the time when the service life of the water purification filter element has expired according to different water sample qualities, so that the water purification filter element can be fully utilized. Compared with the prior art that uses the cumulative use duration of the filter element as a single service life judgment parameter, the present invention avoids the situation where a water purification filter element that still has water purification ability is replaced. By presetting a second threshold to set the minimum use duration of the water purification filter element, the situation of giving a replacement instruction to a water purification filter element with water purification ability due to misjudgment of the change in the electrical signal is avoided, further ensuring the reliability of the judgment result.

[0006] Generally, the resin-type water purification filter elements on the market achieve the water treatment effects of reducing the hardness, alkalinity, etc. of the water sample by making the water purification material interact with the water sample entering the water inlet filter element and performing chemical adsorption or physical adsorption on the materials in the water sample. Hardness and alkalinity are both important indicators for judging water quality and water treatment control. If the hardness and alkalinity of drinking water are too high, it will cause the water heating utensils for heating drinking water to produce scale more easily, which not only shortens the service life of the water heating utensils, but also has an adverse impact on the physical health of the drinkers. There is a strong correlation between the changes in the hardness and alkalinity of the water body and the changes in the electrical signal of the water body. The change in the electrical signal before and after the water sample enters the resin-type water purification filter element can accurately and sensitively reflect the water treatment ability of the resin-type water purification filter element.

[0007] Optionally, the electrical signal includes the electrical performance parameters of the water sample, such as parameters directly characterizing the electrical signal of the water sample, such as conductivity, resistivity, voltage, current, potential, etc., as well as parameters, functions, etc. deduced and constructed using the electrical performance parameters of the water sample.

[0008] In the above method for judging the service life of the resin-type water purification filter element, preferably, the electrical signal of the water sample includes at least one of the conductivity change value or the function constructed from the conductivity change value. The above two electrical signals both show a highly linear correlation with the alkalinity and hardness of the water sample, making the judgment result have high reliability and sensitivity, and the collection operation is simple and easy to implement.

[0009] Preferably, a first threshold is determined according to a water quality change threshold, where the water quality change threshold includes at least one of a water sample hardness change threshold and a water sample alkalinity change threshold; the water sample hardness change threshold is a preset minimum value of the hardness decrease amount corresponding to the water sample before and after passing through the resin-type water purification filter element, and the water sample alkalinity change threshold is a preset minimum value of the alkalinity decrease amount corresponding to the water sample before and after passing through the resin-type water purification filter element.

[0010] When evaluating the service life of a resin-type water purification filter element, the present invention presets a change threshold related to the water treatment ability of the resin-type water purification filter element for the hardness or alkalinity of the water sample, and uses this as a consideration index for judging whether the water purification filter element has reached the service life, so as to ensure that the resin-type water purification filter element in the normal use state can provide sufficient hardness and alkalinity removal capabilities, and avoid the problem that the water sample still has a high hardness or alkalinity after passing through the filter element, resulting in scale formation in the boiling vessel or other drinking water safety problems.

[0011] Preferably, the water sample hardness change threshold is not less than 15%. When the water sample hardness change is less than 15%, it indicates that the resin-type water purification filter element at this time can no longer effectively reduce the hardness of the water sample.

[0012] Preferably, the water sample alkalinity change threshold is not less than 25%. When the water sample alkalinity change is less than 25%, it indicates that the resin-type water purification filter element at this time can no longer effectively reduce the alkalinity of the water sample.

[0013] Preferably, the first threshold is not less than 5%. The main function of the kettle filter element is to prevent scale formation in the kettle when boiling water. When the influence range of the resin-type water purification filter element on the TDS of the water sample passing through it does not exceed 5%, it indicates that the alkalinity decrease rate of the water sample after being treated by the resin-type water purification filter element is less than 20%, and the hardness decrease rate is less than 10%. This means that the resin-type water purification filter element at this time can no longer provide an effective purification effect, and the drinking water passing through the above resin-type water purification filter element will also have a high hardness and alkalinity. Boiling and consuming such drinking water will greatly increase the probability of scale formation in the boiling vessel. At this time, it should be timely reminded that the service life of the resin-type water purification filter element has ended, and a new resin-type water purification filter element should be replaced.

[0014] Preferably, the water sample purification active material in the resin-type water purification filter element includes acidic resin.

[0015] Preferably, the acidic resin includes weak acid-type resin, and at least one of carboxylic acid resin, phosphoric acid resin, boric acid resin, and silicic acid resin is selected as the weak acid-type resin.

[0016] Preferably, the weak acid-type resin contains non-ionic weak acid groups and ionic weak acid salt groups. Calculated by mole percentage, the proportion of the non-ionic weak acid groups in the acidic resin is not less than 10%.

[0017] Preferably, the weakly acidic resin is carboxylic acid resin.

[0018] According to another aspect of the present invention, there is provided a filter element service life judgment system applicable to a resin-type water purification filter element, including a data acquisition module, a service life judgment module, and a filter element replacement reminder module. The data acquisition module is used to collect the electrical signal values before and after the water sample passes through the resin-type water purification filter element, and calculate the change value of the electrical signal of the water sample by using the collected electrical signal values. The service life judgment module is used to perform the comparison between the change value of the electrical signal and the first threshold, and perform the comparison between the actual service duration of the resin-type water purification filter element and the second threshold, and judge whether the service duration of the resin-type water purification filter element reaches the service life according to the comparison result. The first threshold refers to the change threshold of the electrical signal of the water sample, and the second threshold refers to the limit value of the service life of the water sample. The filter element replacement reminder module is used to send an alarm signal to the user to prompt that the resin-type water purification filter element needs to be replaced when the service duration of the resin-type water purification filter element exceeds the service life.

[0019] Preferably, the alarm signal includes one or a combination of an alarm prompt image displayed by a display device, a light, graphic information, and / or alarm prompt audio information emitted by an audio output device, and / or an alarm push message sent by the machine to the user's mobile terminal. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 The linear relationship diagram between the alkalinity change rate of the water sample and the conductivity change rate of the water sample constructed for Example 1;

[0021] Figure 2 The linear relationship diagram between the hardness change rate of the water sample and the conductivity change rate of the water sample constructed for Example 1. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0022] In order to enable those skilled in the art to better understand the solution of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.

[0023] Example 1

[0024] The water sample used in this embodiment is the national standard water efficiency water carrying acidic substances, and the filter element under test is a resin-type water purification filter element. The water purification material of this resin-type water purification filter element is 30% of weak acid resin sodium type (-COONa) + 70% of weak acid resin hydrogen type (-COOH).

[0025] Before and after filtering by the kettle filter element

[0026] (1) Construct a mathematical model of the alkalinity change and conductivity change of the water sample

[0027] S1. Before the water sample to be tested enters the inlet of the resin-type water purification filter element, take a water sample for conductivity test and alkalinity test, record the measured conductivity value as C1, and record the measured alkalinity value as A1;

[0028] S2. Then make the water sample pass through the tested resin-type water purification filter element;

[0029] S3. After the water sample to be tested exits the outlet of the resin-type water purification filter element, take a water sample for conductivity test and alkalinity test, record the measured conductivity value as C2, and record the measured alkalinity value as A2;

[0030] S4. Repeat the above S1 to S3, and accumulate the amount of water passing through the tested resin-type water purification filter element;

[0031] S5. Organize the water sample conductivity change rate data and water sample alkalinity change rate data. Take the water sample alkalinity change value as the abscissa and the water sample conductivity change value as the ordinate value, and fit a linear relationship curve. Use the obtained linear relationship curve as a mathematical model for correlating the alkalinity and conductivity change values of the water body.

[0032] (2) Construct a mathematical model for the change of water sample hardness and the change of water sample conductivity

[0033] S1. Before the water sample to be tested enters the inlet of the resin-type water purification filter element, take a water sample for conductivity test and hardness test, record the measured conductivity value as C1, and record the measured hardness value as B1;

[0034] S2. Then make the water sample pass through the tested resin-type water purification filter element;

[0035] S3. After the water sample to be tested exits the outlet of the resin-type water purification filter element, take a water sample for conductivity test and hardness test, record the measured conductivity value as C2, and record the measured hardness value as B2;

[0036] S4. Repeat the above S1 to S3, and accumulate the amount of water passing through the tested resin-type water purification filter element;

[0037] S5. Organize the water sample conductivity change rate data and water sample hardness change rate data. Take the water sample hardness change value as the abscissa and the water sample conductivity change value as the ordinate value, and fit a linear relationship curve. Use the obtained linear relationship curve as a mathematical model for correlating the hardness and conductivity change values of the water body.

[0038] In this embodiment:

[0039] The removal rate of the alkalinity change involved is obtained according to the following operation method: (A1 - A2) / A1;

[0040] The removal rate of the hardness change involved is obtained according to the following operation method: (B1 - B2) / B1;

[0041] The conductivity change rate involved is obtained according to the following operation method: (C1 - C2) / C1.

[0042] The data collected in this embodiment is shown in Table 1, and the linear relationship obtained by fitting the data listed in Table 1 is as Figure 1 and Figure 2 shown. The data fitting result shows that both the alkalinity change rate and the hardness change rate can show a highly correlated linear relationship with the conductivity change rate. According to Figure 1 the shown linear relationship, when the alkalinity change rate threshold is set to 25%, the calculated conductivity change rate is approximately 7.0%. According to Figure 2 the shown linear relationship, when the hardness change rate threshold is set to 15%, the calculated conductivity change rate is approximately 6.5%.

[0043] Table 1 Test water sample data collection results of Example 1

[0044]

[0045]

[0046] Example 2

[0047] This embodiment provides a method for judging the service life of a resin-type water purification filter element, which specifically includes the following steps;

[0048] Threshold presetting step: Preset a first threshold and a second threshold; In this embodiment, the calculation method of the first threshold is, based on Figure 1 the shown linear relationship formula, when the alkalinity change rate is set to 25%, the calculated conductivity change rate is approximately 7.0%, and the conductivity change rate at this time is used as the first threshold; The second threshold refers to the limit value of the service life of the water sample. In this embodiment, the second threshold is set to 30 days;

[0049] Electric signal detection step: Detect the water sample conductivity of the water sample before and after passing through the resin-type water purification filter element, and calculate the conductivity change rate of the water sample accordingly;

[0050] Electric signal comparison step: Compare the conductivity change rate with the first threshold; If the conductivity change rate is lower than the first threshold, execute the service life judgment step; If the conductivity change rate is higher than the first threshold, make a judgment that the resin-type water purification filter element can continue to be used;

[0051] Service life judgment step: Compare the actual use duration of the resin-type water purification filter element with the second threshold; If the actual use duration is higher than the second threshold, make a judgment that the resin-type water purification filter element needs to be replaced; If the actual use duration is lower than the second threshold, execute the water sample electric signal comparison step again.

[0052] Example 3

[0053] This embodiment provides a method for judging the service life of a resin-type water purification filter element, which specifically includes the following steps;

[0054] Threshold presetting step: preset a first threshold and a second threshold; in this embodiment, the calculation method of the first threshold is based on Figure 2 the shown linear relationship. When the hardness change rate is set to 15%, the calculated conductivity change rate is about 6.5%. Take the conductivity change rate at this time as the first threshold; the second threshold refers to the limit value of the service life of the water sample. In this embodiment, the second threshold is set to 30 days;

[0055] Electric signal detection step: detect the conductivity of the water sample before and after the water sample passes through the resin-type water purification filter element, and calculate the conductivity change rate of the water sample accordingly;

[0056] Electric signal comparison step: compare the conductivity change rate with the first threshold; if the conductivity change rate is lower than the first threshold, execute the service life judgment step; if the conductivity change rate is higher than the first threshold, make a judgment that the resin-type water purification filter element can continue to be used;

[0057] Service life judgment step: compare the actual use duration of the resin-type water purification filter element with the second threshold; if the actual use duration is higher than the second threshold, make a judgment that the resin-type water purification filter element needs to be replaced; if the actual use duration is lower than the second threshold, execute the water sample electric signal comparison step again.

[0058] Embodiment 4

[0059] In this embodiment, by changing the water purification material composition of the tested resin-type water purification filter element, data collection and processing are carried out according to the following steps:

[0060] S1. After the tested resin-type water purification filter element filters 20 L of national standard water efficiency water, at the inlet of the water sample to be tested entering the resin-type water purification filter element, take a water sample for conductivity test, alkalinity test and hardness test. Record the measured conductivity value as C1, the measured alkalinity value as A1, and the hardness value as B1;

[0061] S2. Then let the water sample pass through the tested resin-type water purification filter element;

[0062] S3. At the outlet of the water sample to be tested discharged from the resin-type water purification filter element, take a water sample for conductivity test, alkalinity test and hardness test. Record the measured conductivity value as C2, the measured alkalinity value as A2, and the hardness value as B2;

[0063] S4. Using the data collected in S1 to S3, calculate the conductivity change rate, alkalinity change rate and hardness change rate of the water sample, and the calculation results are recorded in Table 2.

[0064] Table 2 Sampling Results of Test Water Samples in Example 4

[0065]

[0066]

[0067] The experimental data in Table 2 show that: the filter element of 100% ionic sulfonic acid type or carboxylic acid type resin can remove the hardness in water, but cannot remove the alkalinity in water, and the conductivity remains unchanged before and after filtration; when the non-ionic -COOH group of the weak acid resin accounts for 10% molar ratio, although both the alkalinity and hardness are removed by more than 30%, the change in its conductivity is very small; when the molar ratio of the non-ionic -COOH group of the weak acid resin exceeds 10%, the change in conductivity increases significantly, and the removal effect of the alkalinity and hardness of the water sample can be significantly characterized by the change value of TDS.

[0068] Finally, it should be noted that: the embodiments of the present invention are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for judging the service life of a resin-type water purification filter element, characterized in that: It includes a threshold presetting step, an electrical signal detection step, an electrical signal comparison step, and a service life judgment step; The threshold presetting step: preset a first threshold and a second threshold; the first threshold refers to the change threshold of the water sample electrical signal, and the water sample electrical signal includes at least one of the conductivity change value or a function constructed by the conductivity change value. The first threshold is determined according to the water quality change threshold, and the water quality change threshold includes at least one of the water sample hardness change threshold and the water sample alkalinity change threshold. The water sample hardness change threshold is the preset minimum value of the hardness decrease corresponding to the water sample before and after passing through the resin-type water purification filter element, and the water sample alkalinity change threshold is the preset minimum value of the alkalinity decrease corresponding to the water sample before and after passing through the resin-type water purification filter element; The second threshold refers to the limit value of the service life of the water sample; The electrical signal detection step: detect the value of the water sample electrical signal of the water sample before and after passing through the resin-type water purification filter element, and calculate the change value of the water sample electrical signal accordingly; The electrical signal comparison step: compare the electrical signal change value with the first threshold; if the electrical signal change value is lower than the first threshold, execute the service life judgment step; if the electrical signal change value is higher than the first threshold, make a judgment that the resin-type water purification filter element can continue to be used; The service life judgment step: compare the actual use duration of the resin-type water purification filter element with the second threshold; if the actual use duration is higher than the second threshold, make a judgment that the resin-type water purification filter element needs to be replaced; if the actual use duration is lower than the second threshold, execute the water sample electrical signal comparison step again.

2. The method for judging the service life of a resin-type water purification filter element according to claim 1, characterized in that: The water sample hardness change threshold is not less than 15%.

3. The method for judging the service life of a resin-type water purification filter element according to claim 1, characterized in that: The water sample alkalinity change threshold is not less than 25%.

4. The method for judging the service life of a resin-type water purification filter element according to claim 1, characterized in that: The first threshold is not less than 5%.

5. The method for judging the service life of a resin-type water purification filter element according to any one of claims 1 to 4, characterized in that: The water sample purification active material in the resin-type water purification filter element includes acidic resin.

6. The method for judging the service life of a resin-type water purification filter element according to claim 5, characterized in that: The acidic resin includes weak acidic resin, and at least one of carboxylic acid resin, phosphoric acid resin, boric acid resin, and silicic acid resin is selected as the weak acidic resin.

7. The method for judging the service life of a resin-type water purification filter element according to claim 6, characterized in that: The weak acidic resin contains non-ionic weak acid groups and ionic weak acid salt groups. Calculated by mole percentage, the proportion of the non-ionic weak acid groups in the acidic resin is not less than 10%.

8. The method for judging the service life of a resin-type water purification filter element according to claim 6, characterized in that: The weak-acid resin is a carboxylic acid resin.

9. A filter element service life judgment system applicable to resin-type water purification filter elements, characterized in that: The filter element service life judgment system realizes the judgment of the filter element service life by using the method for judging the service life of a resin-type water purification filter element according to any one of claims 1 to 8; the filter element service life judgment system includes a data acquisition module, a service life judgment module, and a filter element replacement reminder module; The data acquisition module is used for acquiring the electrical signal values before and after the water sample passes through the resin-type water purification filter element, and calculating the electrical signal change value of the water sample by using the acquired electrical signal values; The service life judgment module is used for performing the comparison between the electrical signal change value and the first threshold, and performing the comparison between the actual use duration of the resin-type water purification filter element and the second threshold, and judging whether the use duration of the resin-type water purification filter element reaches the service life according to the comparison result; the first threshold refers to the change threshold of the electrical signal of the water sample, and the second threshold refers to the limit value of the service life of the water sample; The filter element replacement reminder module is used for sending an alarm signal to the user to prompt that the resin-type water purification filter element needs to be replaced when the use duration of the resin-type water purification filter element exceeds the service life.

10. The filter element service life judgment system applicable to a resin-type water purification filter element according to claim 9, characterized in that: The alarm signal includes one or a combination of the alarm prompt light and graphic information displayed by the display device, and / or the alarm prompt audio information emitted by the audio output device, and / or the alarm push information sent by the machine to the user's mobile terminal.

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