CN115490345B - Control method for water purifier and water purifier - Google Patents

Abstract

The invention relates to the technical field of water purifying equipment, in particular to a control method for a water purifier and the water purifier, and aims to solve the problem that the prior water purifier cannot adjust the TDS value of filtered pure water and influences the use experience of users. For this purpose, the water proportion regulating valve of the invention comprises a first water inlet, a second water inlet and a water outlet, wherein two ends of the first water way are respectively communicated with the water outlet end and the first water inlet of the reverse osmosis membrane water purifying filter element, and two ends of the second water way are respectively communicated with the water outlet end and the second water inlet of the preposed filter element, and the control method of the invention comprises the following steps: acquiring a current TDS value of a water outlet; obtaining a target TDS value; and selectively adjusting the opening degree of the water proportion adjusting valve according to the current TDS value and the target TDS value. According to the invention, the opening of the water proportional regulating valve can be selectively regulated according to the current TDS value and the target TDS value to regulate the water inflow of the first waterway and the second waterway, so that the TDS value of the water outlet can be conveniently regulated, and the use experience of a user is improved.

Description

Control method for water purifier and water purifier

technical field

The invention relates to the technical field of water purification equipment, and specifically provides a control method for a water purifier and the water purifier.

Background technique

With the continuous development of the water purification industry, there are various types of water purifiers, but the fundamental purpose is to obtain healthy and clean drinking water. At present, the TDS value of pure water purified by RO membrane of RO water purifiers on the market has the greatest relationship with RO membrane, that is, the TDS value of pure water flowing out of the water purifier can only be the TDS of pure water purified by RO membrane value.

The TDS value of the pure water flowing out of the existing water purifier after being purified by the RO membrane cannot be adjusted according to the needs of the user, so that the user can only obtain pure water with a single TDS value, which affects the user experience.

Therefore, a new technical solution is needed in the art to solve the above problems.

Contents of the invention

The present invention aims to solve the above-mentioned technical problem, that is, the existing water purifier cannot adjust the TDS value of the filtered pure water, which affects the user experience.

In a first aspect, the present invention provides a control method for a water purifier, the water purifier includes a pre-filter element, a reverse osmosis membrane water purification element, a first waterway, a second waterway, a water ratio regulating valve and Water outlet waterway, the water outlet end of the pre-filter element communicates with the water inlet end of the reverse osmosis membrane water purification filter element, the water ratio regulating valve has a first water inlet, a second water inlet and a water outlet, and the first One end of a waterway communicates with the water outlet of the reverse osmosis membrane water purification filter element, the other end of the first waterway communicates with the first water inlet, and one end of the second waterway communicates with the pre-filter element. The water outlet is connected, the other end of the second waterway is connected with the second water inlet, the water outlet is connected with the water outlet, and the water intake of the first water inlet is adjusted according to the water ratio adjustment valve. The water intake of the second water inlet increases with the increase of the opening degree of the water proportional regulating valve, and the control method includes: acquiring the current TDS value of the water outlet E1; acquiring a target TDS value E0; selectively adjusting the opening of the water proportional regulating valve according to the current TDS value E1 and the target TDS value E0.

In the preferred technical solution of the above control method, the specific step of "selectively adjusting the opening degree of the water proportional regulating valve according to the current TDS value E1 and the target TDS value E0" includes: judging the current TDS Whether the value E1 is equal to the target TDS value E0; if the judgment result is "yes", the opening of the water proportional regulating valve is not adjusted; if the judgment result is "no", the opening of the water proportional regulating valve is adjusted opening.

In the preferred technical solution of the above control method, the specific steps of "adjusting the opening degree of the water proportional regulating valve" include: calculating the first difference Δ1=|E0-E1|; It is compared with the first preset value A1; according to the comparison result, a corresponding preset adjustment mode is selected to adjust the opening degree of the water proportional regulating valve; wherein, A1>0.

In the preferred technical solution of the above control method, the specific steps of "according to the comparison result, select the corresponding preset adjustment method to adjust the opening degree of the water proportional regulating valve" include: if Δ1>A1, then according to the The current TDS value E1 and the target TDS value E0 calculate a first target opening D ₁ ; and adjust the opening of the water proportional regulating valve to the first target opening D ₁ .

In the preferred technical solution of the above control method, the specific step of "calculating the first target opening degree D ₁ according to the current TDS value E1 and the target TDS value E0" includes: obtaining the current opening degree of the water proportional regulating valve D _t ; calculate the first demand adjustment amount ΔD ₁ =k1×(E0-E1); calculate the first target opening D ₁ =D _t +ΔD ₁ ; where k1 is a feedforward coefficient.

In the preferred technical solution of the above control method, the specific steps of "according to the comparison result, select the corresponding preset adjustment method to adjust the opening degree of the water proportional regulating valve" include: if △1≤A1, first set the The opening of the water proportional regulating valve is adjusted to a preset opening D ₀ ; the adjusted TDS value E2 of the water outlet is obtained; according to the preset opening D ₀ , the current TDS value E1, the target The TDS value E0 and the adjusted TDS value E2 of the water outlet calculate a second target opening D ₂ ; and adjust the opening of the water proportional regulating valve to the second target opening D ₂ .

In the preferred technical solution of the above control method, "calculate the second target according to the preset opening degree D ₀ , the current TDS value E1, the target TDS value E0 and the adjusted TDS value E2 of the water outlet The specific steps of the opening D ₂ ″ include: calculating the second demand adjustment amount ΔD ₂ =k2×(E0-E2)+k3×E0+k4×(E0-2×E2+E1); calculating the second target Opening degree D ₂ =D ₀ +ΔD ₂ ; where, k2 is a proportional coefficient, k3 is an integral coefficient, and k4 is a differential coefficient.

In the preferred technical solution of the above control method, the water purifier further includes an alarm device, and the control method further includes: acquiring the TDS value E4 of the water in the first waterway; The TDS value E4 and the target TDS value E0 selectively activate the alarm device.

In the preferred technical solution of the above control method, the specific step of "selectively activating the alarm device according to the TDS value E4 of the water in the first waterway and the target TDS value E0" includes: calculating the second difference Value Δ2=E0-E4; compare the second difference Δ2 with a second preset value A2; selectively activate the alarm device according to the comparison result; wherein A2≥0.

In a second aspect, the present invention provides a water purifier. The water purifier of the present invention includes a controller configured to execute the control method described above.

In the case of adopting the above-mentioned technical solution, the water purifier of the present invention can selectively adjust the opening degree of the water proportional regulating valve through the target TDS value set by the user and the current TDS value of the water outlet, thereby facilitating the adjustment from reverse osmosis Membrane water purification filter element and pre-filter element flow into the water ratio regulating valve to adjust the TDS value of the mixed water at the water outlet, so that users can get the water with the required TDS value and improve the user experience.

Further, by judging whether the target TDS value of the water outlet required by the user is equal to the current TDS value of the water outlet, it can be made that when the target TDS value required by the user is not equal to the current TDS value of the water outlet, by adjusting the water ratio regulating valve Adjust the water intake of the first water inlet and the second water inlet by adjusting the opening degree of the water outlet, so as to adjust the TDS value of the water outlet and make the TDS value of the water outlet match the target TDS value of the user's demand, so that the user can obtain the user's demand at the water outlet Water with the target TDS value; when the target TDS value required by the user is equal to the current TDS value of the water outlet, there is no need to adjust the opening of the water proportional regulating valve to obtain the water with the target TDS value required by the user at the water outlet.

Furthermore, by first calculating the first difference Δ1, and then comparing the first difference Δ1 with the first preset value A1, the gap between the current TDS value E1 and the target TDS value E0 can be judged. On the one hand , so that when the current TDS value E1 is relatively close to the target TDS value E0, the adjustment method of adjusting the opening of the water proportional regulating valve in a small range is adopted, so as to avoid the water whose target TDS value cannot be obtained due to the excessive adjustment range. When the difference between the target TDS value E0 is relatively large, the adjustment method of adjusting the opening of the water proportional control valve is adopted to avoid the adjustment time being too long due to the small adjustment range, which affects the adjustment efficiency; on the other hand, it is different from only one preset Compared with the situation of adjusting the adjustment method, according to the comparison result of the first difference Δ1 and the first preset value A1, selecting the corresponding preset adjustment method to adjust the opening of the water proportional regulating valve can make the TDS of the water outlet The value adjustment is more precise, the adjustment speed is faster, the efficiency is higher, and the user experience is better.

Still further, compared with the situation of obtaining the first target opening degree _D1 based on experience and adjusting the opening degree of the water proportional regulating valve 133 to the first target opening degree _D1 , first according to the TDS value E1 and the target TDS Value E0 calculates the first target opening degree D ₁ , and then adjusts the opening degree of the water proportional regulating valve 133 to the first target opening degree D ₁ , which can make the opening degree adjustment of the water proportional regulating valve faster and save the adjustment time of the TDS value , at the same time, it can also make the calculation of the first target opening value more accurate.

Still further, when the difference between the current TDS value E1 and the target TDS value E0 is relatively small, the TDS value E2 of the adjusted water outlet can be obtained by first adjusting the opening degree of the water proportional regulating valve to the preset opening degree _D0 , It is helpful to create the conditions of the PID control algorithm, and then calculate the second target opening according to the PID control algorithm through the preset opening D ₀ , the current TDS value E1, the target TDS value E0 and the adjusted water outlet TDS value E2 D ₂ , so that when the current TDS value E1 is very close to the target TDS value E0, the second target opening of the water proportional regulating valve can be accurately calculated, and the water proportional regulating valve can be adjusted to the calculated second target opening, thereby The TDS value of the water flowing out of the water outlet is made more accurate, and the user experience is further improved.

Furthermore, by setting an alarm device on the water purifier, when the TDS value E4 of the water in the first waterway is higher than the target TDS value E0, the alarm device can be activated in time to remind the user to replace the reverse osmosis membrane water purification filter element, so as to avoid affecting The normal use of the user further improves the user experience.

Still further, compared with directly comparing the TDS value E4 of the water in the first waterway with the target TDS value E0, first calculate the difference between the TDS value E4 of the water in the first waterway and the target TDS value E0 value, and then comparing the difference with the second preset value A2 can prevent misjudgment caused by the detection error of the TDS value E4 of the water in the first waterway, thereby improving the accuracy of the judgment.

In addition, the water purifier further provided by the present invention on the basis of the above-mentioned technical solution adopts the control method introduced above, and further possesses the beneficial effects of the above-mentioned control method. Compared with the water purifier before improvement, this The invented water purifier can quickly adjust the TDS value of the purified pure water according to the user's needs, and at the same time make the TDS value of the pure water obtained by the user closer to the target TDS value, and the user experience is better.

Description of drawings

Describe preferred embodiment of the present invention below in conjunction with accompanying drawing, in the accompanying drawing:

Fig. 1 is the structural representation of water purifier of the present invention;

Fig. 2 is the flowchart of control method of the present invention;

Fig. 3 is a flowchart of an embodiment of the control method of the present invention.

List of reference signs:

1. Shell; 11. Inlet; 12. Outlet; 13. Chamber; 131. Reverse osmosis membrane water purification filter element; 1311. First water inlet; 1312. First water outlet; 132. Pre-filter element; 1321 , the second water inlet; 1322, the second water outlet; 133, the water ratio regulating valve; 1331, the first water inlet; 1332, the second water inlet; 1333, the water outlet; 134, the water outlet; 1341, the first TDS Sensor; 135, first waterway; 1351, second TDS sensor; 136, second waterway; 137, first water inlet pipe; 1371, booster pump; 138, second water inlet pipe; 14, alarm device.

Detailed ways

Preferred embodiments of the present invention are described below with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are only used to explain the technical principles of the present invention, and are not intended to limit the protection scope of the present invention.

It should be noted that, in the description of the present invention, the terms "inner", "outer" and other terms indicating direction or positional relationship are based on the direction or positional relationship shown in the drawings, which are only for the convenience of description, rather than indicating Or imply that the device or element must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be construed as limiting the invention. In addition, the terms "first", "second", "third", and "fourth" are used for descriptive purposes only, and should not be construed as indicating or implying relative importance.

In addition, it should be noted that, in the description of the present invention, unless otherwise specified and limited, the terms "setting" and "connection" should be understood in a broad sense, and those skilled in the art can understand them according to specific situations The specific meanings of the above terms in the present invention.

Please refer to FIG. 1 , which is a schematic structural view of the water purifier of the present invention.

As shown in Figure 1, the water purifier of the present invention comprises a housing 1, a chamber 13 formed in the housing 1, a pre-filtration filter element 132 and a reverse osmosis membrane water purification filter element 131 arranged in the chamber 13 and water For the proportional regulating valve 133 , the housing 1 of the water purifier has an inlet 11 and an outlet 12 , and the water proportional regulating valve 133 has a first water inlet 1331 , a second water inlet 1332 and a water outlet 1333 .

As shown in Figure 1, the water inlet end of the reverse osmosis membrane water purification filter element 131 is marked as the first water inlet end 1311, the water outlet end of the reverse osmosis membrane water purification filter element 131 is marked as the first water outlet end 1312, and the front filter element 132 The water inlet of the water inlet is marked as the second water inlet 1321 , and the water outlet of the pre-filter element 132 is marked as the second water outlet 1322 . The second water inlet 1321 of the pre-filter element 132 communicates with the inlet 11 through the first water inlet pipe 137, and the second water outlet 1322 of the pre-filter element 132 communicates with the second water inlet 138 of the reverse osmosis membrane water purification element 131 through the second water inlet 138. A water inlet port 1311 is connected.

As shown in Figure 1, the water purifier also includes a first waterway 135, a second waterway 136 and an outlet waterway 134, and one end of the first waterway 135 communicates with the first water outlet 1312 of the reverse osmosis membrane water purification filter element 131, and the first waterway The other end of 135 communicates with the first water inlet 1331, and one end of the second waterway 136 communicates with the second water outlet 1322 of the pre-filter element 132, and the other end of the second waterway 136 communicates with the second water inlet 1332, and the water outlet 134 One end of the outlet channel 134 communicates with the water outlet 1333 , and the other end of the water outlet channel 134 communicates with the outlet 12 .

It should be noted that, in practical applications, the second waterway 136 can be set to communicate with the second water inlet pipe 138 so that one end of the second waterway 136 communicates with the second water outlet 1322 of the pre-filter element 132, or, also Two interfaces can be set at the second water outlet 1322 of the pre-filter element 132, wherein one interface communicates with the second water inlet pipe 138, so that the water filtered by the pre-filter element 132 can be sent to the reverse osmosis membrane water purification In the filter element 131, another interface communicates with the second waterway 136, so that the water filtered by the pre-filter element 132 is delivered to the water ratio regulating valve 133 through the second water inlet 1332, etc., this flexible adjustment and Changes that do not deviate from the principle and scope of the present invention should be included in the protection scope of the present invention.

Preferably, as shown in FIG. 1 , one end of the second water channel 136 is set to communicate with the second water inlet pipe 138 .

As shown in FIG. 1 , the water purifier further includes a booster pump 1371 disposed on the first water inlet pipe 137 , and the booster pump 1371 can deliver water to the pre-filter element 132 and the reverse osmosis membrane water purification filter element 131 .

It should be noted that, in practical application, the water ratio regulating valve 133 is not limited to be arranged in the casing 1, for example, the water ratio regulating valve 133 can also be arranged outside the casing 1, for example, in the casing A first water outlet pipe and a second water outlet pipe (not shown in the figure) are arranged on the body 1, and one end of the first water outlet pipe communicates with the first water outlet end 1312 of the reverse osmosis membrane water purification filter element 131, and the other end of the first water outlet pipe It communicates with the first water inlet 1331, one end of the second water outlet pipe communicates with the second water outlet 1322 of the pre-filter element 132, and the other end of the second water outlet pipe communicates with the second water inlet 1332, etc., this flexible Adjustments and changes that do not deviate from the principle and scope of the present invention should be included in the protection scope of the present invention. Of course, preferably, the water ratio regulating valve 133 is arranged in the casing 1 .

It should be noted that, in practical applications, those skilled in the art can set the water ratio regulating valve 133 so that the water intake of the first water inlet 1331 decreases as the opening of the water ratio regulating valve 133 increases, and the second water ratio regulating valve 133 increases. The water intake of the water inlet 1332 increases with the opening of the water ratio regulating valve 133, or the water ratio regulating valve 133 can also be set so that the water intake of the first water inlet 1331 increases with the opening of the water ratio regulating valve 133. The increase of the opening of the second water inlet 1332 decreases with the increase of the opening of the water proportional regulating valve 133, etc. This flexible adjustment and change does not deviate from the principle of the present invention The principle and scope should be included in the protection scope of the present invention.

Next, the water ratio regulating valve 133 is set so that the water intake of the first water inlet 1331 decreases as the opening of the water ratio regulating valve 133 increases, and the water intake of the second water inlet 1332 decreases with the opening of the water ratio regulating valve 133. The situation where the opening increases with the increase is taken as an example to introduce a specific embodiment of the control method of the present invention.

Referring next to FIG. 2 , FIG. 2 is a flow chart of the control method of the present invention.

As shown in Figure 2, the control method of the present invention comprises the following steps:

S1000: Obtain the current TDS value E1 of the water outlet 1333;

S2000: Obtain the target TDS value E0;

S3000: Selectively adjust the opening degree of the water proportional regulating valve 133 according to the current TDS value E1 and the target TDS value E0.

Through such a setting, the opening of the water ratio regulating valve 133 can be selectively adjusted through the target TDS value set by the user and the current TDS value of the water outlet 1333, thereby facilitating the adjustment of the reverse osmosis membrane water purification filter element 131 and the front The filter element 132 flows into the water ratio regulating valve 133 to adjust the TDS value of the mixed water at the water outlet 1333, so that the user can obtain the water with the required TDS value and improve the user experience.

It should be noted that in practical applications, those skilled in the art can set the target TDS value as a fixed value, or set the target TDS value as a set value input by the user, and obtain the target TDS value according to the value input by the user. TDS value and so on, such flexible adjustment and change do not deviate from the principle and scope of the present invention, should be included in the protection scope of the present invention.

Preferably, the target TDS value is set as a set value input by a user.

It should be noted that the TDS value refers to the concentration of total dissolved substances in water, and the unit is mg/L (mg/L).

It should also be noted that in practical applications, those skilled in the art can install a TDS detection sensor on the outlet waterway 134 to obtain the current TDS value of the water outlet 1333, or can also install a conductivity meter on the outlet waterway 134, through The value of the conductivity meter is used to feed back the current TDS value of the water outlet 1333. Alternatively, the water sample on the water channel 134 can be directly connected to directly measure the TDS value of the water sample to obtain the current TDS value of the water outlet 1333, etc. , such flexible adjustments and changes do not depart from the principle and scope of the present invention, and should be included within the protection scope of the present invention.

Preferably, as shown in FIG. 1 , a first TDS sensor 1341 is provided on the water outlet channel 134 , and the current TDS value of the water outlet 1333 is acquired through the value detected by the first TDS sensor 1341 .

Referring next to FIG. 3 , FIG. 3 is a flowchart of an embodiment of the control method of the present invention.

Preferably, as shown in FIG. 3 , the specific steps of "selectively adjusting the opening degree of the water proportional regulating valve 133 according to the current TDS value E1 and the target TDS value E0" include:

S3100: judging whether the current TDS value E1 is equal to the target TDS value E0;

S3110: If the judgment result is "Yes", then do not adjust the opening degree of the water proportional regulating valve 133;

S3120: If the judgment result is "No", adjust the opening degree of the water proportional regulating valve 133 .

Through such a setting, when the target TDS value required by the user is not equal to the current TDS value of the water outlet 1333, the water ratio of the first water inlet 1331 and the second water inlet 1332 can be adjusted by adjusting the opening degree of the water proportional regulating valve 133. Water intake, thereby adjusting the TDS value of the water outlet 1333 and making the TDS value of the water outlet 1333 consistent with the target TDS value of the user's demand, so that the user can obtain the water of the target TDS value of the user's demand at the water outlet 1333; when the target of the user's demand When the TDS value is equal to the current TDS value of the water outlet 1333 , the water with the target TDS value required by the user can be obtained at the water outlet 1333 without adjusting the opening degree of the water proportional regulating valve 133 .

It should be noted that in practical applications, those skilled in the art can set the current TDS value E1 equal to the target TDS value E0 to directly compare the current TDS value E1 with the target TDS value E0. If E1=E0, it means that the current TDS value E1 is equal to the target TDS value E0. The TDS value E1 is equal to the target TDS value E0, or the current TDS value E1 and the target TDS value E0 can also be set to be equal to the difference between the current TDS value E1 and the target TDS value E0, if the difference is within the preset range It means that the current TDS value E1 is equal to the target TDS value E0, etc. This kind of flexible adjustment and change does not deviate from the principle and scope of the present invention, and should be included in the protection scope of the present invention.

Preferably, the specific steps of judging whether the current TDS value E1 is equal to the target TDS value E0 include:

Calculate the third difference △3=E0-E1;

Comparing the third difference Δ3 with the third preset value A3 and the fourth preset value A4 respectively;

If A3≤△3≤A4, the current TDS value E1 is equal to the target TDS value E0;

Wherein A3<0, A4>0.

Through such an arrangement, misjudgment caused by the first TDS sensor 1341 detecting the TDS value of the water outlet 1333 can be avoided.

It should be noted that, in practical applications, those skilled in the art can adjust the opening degree of the water proportional regulating valve 133 to be adjusted by a preset adjustment method, such as in the form of multiple adjustments, each adjustment setting Alternatively, the difference between the current TDS value E1 and the target TDS value E0 can be calculated first, and then the corresponding preset adjustment method can be selected according to the difference to adjust the opening of the water proportional regulating valve 133. Etc., the adjustment and change of the specific adjustment method of the opening degree of the water proportional regulating valve 133 does not deviate from the principle and scope of the present invention, and should be included in the protection scope of the present invention.

Preferably, as shown in Figure 3, the specific steps of "adjusting the opening degree of the water ratio regulating valve 133" include:

S3121: Calculate the first difference △1=|E0-E1|;

S3122: Comparing the first difference Δ1 with the first preset value A1;

S3123: According to the comparison result, select a corresponding preset adjustment method to adjust the opening degree of the water proportional adjustment valve 133;

Among them, A1>0.

Through such a setting, on the one hand, the difference between the current TDS value E1 and the target TDS value E0 can be judged according to the comparison result of the first difference Δ1 and the first preset value A1, so that it is convenient to compare the current TDS value E1 and the target TDS value. When the value E0 is relatively close, the adjustment method of adjusting the opening degree of the water proportional regulating valve 133 is adopted in a small range, so as to avoid the water with the target TDS value being unable to be obtained due to the excessive adjustment range, and when the difference between the current TDS value E1 and the target TDS value E0 is relatively large. The adjustment method of adjusting the opening degree of the water proportional regulating valve 133 in a large scale avoids the adjustment time being too long due to too small adjustment range, which affects the water outlet efficiency of the water outlet 1333; According to the comparison result of the first difference Δ1 and the first preset value A1, selecting the corresponding preset adjustment mode to adjust the opening degree of the water proportional regulating valve 133 can make the TDS value of the water outlet 1333 The adjustment is more precise, the adjustment speed is faster, the efficiency is higher, and the user experience is better.

It should be noted that in practical applications, it is not limited to first calculating the absolute value of the difference between the current TDS value E1 and the target TDS value E0, and then comparing the absolute value of the difference with the first preset value. As a result, the corresponding preset adjustment method is selected to adjust the opening of the water proportional regulating valve 133, or, the absolute value of the ratio of the current TDS value E1 to the target TDS value E0 can also be calculated first, and then the absolute value of the ratio is compared with the first A preset value is compared, and the corresponding preset adjustment method is selected according to the comparison result to adjust the opening degree of the water proportional regulating valve 133, etc. This flexible adjustment and change does not deviate from the principle and scope of the present invention. Should be included within the protection scope of the present invention.

It should also be noted that in practical applications, it is not limited to first calculating the absolute value of the difference between the current TDS value E1 and the target TDS value E0, and then comparing the absolute value with the first preset value. For example, you can also First calculate the difference between the current TDS value E1 and the target TDS value E0, and then compare the difference with two preset values at the same time, and so on. This flexible adjustment and change does not deviate from the principle and scope of the present invention. All should be included within the protection scope of the present invention. Of course, preferably, the absolute value of the difference between the current TDS value E1 and the target TDS value E0 is calculated first, and then the absolute value is compared with the first preset value.

Preferably, the specific steps of "according to the comparison result, select the corresponding preset adjustment method to adjust the opening degree of the water proportional adjustment valve 133" include:

If Δ1>A1, then calculate the first target opening D ₁ according to the current TDS value E1 and the target TDS value E0;

The opening degree of the water ratio regulating valve 133 is adjusted to the first target opening degree D ₁ .

With such a setting, compared with the situation of obtaining the first target opening degree _D1 based on experience and adjusting the opening degree of the water proportional regulating valve 133 to the first target opening degree _D1 , first according to the TDS value E1 and the target TDS value E0 calculates the first target opening degree D ₁ , and then adjusts the opening degree of the water proportional regulating valve 133 to the first target opening degree D ₁ , which can make the opening degree adjustment of the water proportional regulating valve faster and save the adjustment of the TDS value At the same time, it can also make the calculation of the first target opening value more accurate.

It should be noted that in practical applications, it is not limited to calculating the first target opening D ₁ based on the current TDS value E1 and the target TDS value E0, for example, it is also possible to first find out multiple sets of first difference values Δ 1 and the corresponding value of the first target opening D ₁ , and then compare multiple sets of corresponding values to obtain the first target opening D ₁ , etc., this kind of adjustment and change of the specific acquisition method of the first target opening D ₁ Anything that does not deviate from the principle and scope of the present invention should be included in the protection scope of the present invention.

It should also be noted that, in practical applications, those skilled in the art can directly calculate the first target opening degree D ₁ of the water ratio regulating valve 133, or obtain the current opening degree of the water ratio regulating valve 133, and calculate the water ratio regulating valve 133 first. The demand adjustment amount of the proportional regulating valve 133, and then calculate the first target opening D ₁ , etc., this kind of flexible adjustment and change does not deviate from the principle and scope of the present invention, and should be included in the protection scope of the present invention .

Preferably, the specific steps of "calculating the first target opening D ₁ according to the current TDS value E1 and the target TDS value E0" include:

Obtain the current opening degree D _t of the water proportional regulating valve 133;

Calculate the first demand adjustment amount △D ₁ =k1×(E0-E1);

Calculate the first target opening D ₁ =D _t +ΔD ₁ ; wherein, k1 is a feedforward coefficient.

Through such a setting, that is, by first calculating the demand adjustment amount, and then calculating the first target opening D ₁ , compared with directly calculating the first target opening D ₁ , it is possible to reduce the impact of the error caused by the water proportional regulating valve 133 on the first target opening D 1 . The influence caused by the adjustment of the target opening degree _D1 makes the adjustment of the water proportional regulating valve 133 more accurate, thereby making the TDS value of the water outlet 1333 close to the target TDS value and improving the accuracy of TDS adjustment.

It should be noted that in practical applications, those skilled in the art can determine the specific value of k1 based on experience or experiments.

Exemplarily, the current TDS value of the water outlet is set to be E1 _i , assuming that the TDS value of the water outlet can be equal to the target TDS value after adjusting the opening of the water proportional regulating valve by n _i % (ie ΔD ₁ ), Measure the TDS value E0 _i of the water outlet after the opening of the water proportional regulating valve is adjusted to n _i %, repeat the above operations, and obtain multiple sets of data of E1 _i and E0 _i corresponding to n _i %, and substitute the multiple sets of data into In the following formula:

ΔD ₁ =k1×(E0-E1);

The following equation is obtained:

n ₁ %=k1×(E0 ₁ −E1 ₁ );

n ₂ %=k1×(E0 ₂ −E1 ₂ );

n ₃ %=k1×(E0 ₃ −E1 ₃ );

n _i %=k1×(E0 _i -E1 _i );

where i>0;

In the above equations, any one of the equations can be taken as a linear equation with unknown number k1, and the value of k1 can be obtained by solving the linear equation.

It should be noted that, in order to make the obtained k1 relatively accurate, multiple values of k1 can be calculated through different equations, and then the values of multiple k1 can be averaged to obtain a relatively accurate value k1, or, It is also possible to perform curve fitting on the above multiple sets of data, for example, take n _i % as the y-axis and E0 _i -E1 _i as the x-axis, and perform curve fitting to obtain a straight line with a slope of k1, which can be obtained The specific value of k1.

Preferably, the specific steps of "according to the comparison result, select the corresponding preset adjustment method to adjust the opening degree of the water proportional adjustment valve 133" include:

If △1≦A1, firstly adjust the opening degree of the water proportional regulating valve 133 to the preset opening degree D ₀ ;

Obtain the adjusted TDS value E2 of the water outlet 1333;

Calculate the second target opening D 2 according to the preset opening D ₀ , the current TDS value E1, the target TDS value E0 and the adjusted TDS value _E2 of the water outlet 1333;

The opening degree of the water ratio regulating valve 133 is adjusted to the second target opening degree D ₂ .

With such a setting, when the difference between the current TDS value E1 and the target TDS value E0 is relatively small, the TDS of the water outlet 1333 after adjustment can be obtained by first adjusting the opening of the water proportional regulating valve 133 to the preset opening D ₀ The value E2 is helpful to create the conditions of the PID control algorithm, and then calculate the first TDS value E2 according to the PID control algorithm through the preset opening D ₀ , the current TDS value E1, the target TDS value E0 and the adjusted TDS value E2 of the water outlet 1333 Two target openings D ₂ , so that when the current TDS value E1 is very close to the target TDS value E0, the second target opening D ₂ of the water proportional regulating valve 133 can be accurately calculated, and the water proportional regulating valve 133 can be adjusted to the calculated The second target opening D ₂ , so that the TDS value of the water flowing out of the water outlet 1333 is more accurate, and further improves the user experience.

It should be noted that, in practical applications, those skilled in the art can determine the opening value of the preset opening D ₀ based on experience or experiments, or directly set the preset opening D ₀ as a fixed value, etc. etc., such flexible adjustments and changes do not depart from the principle and scope of the present invention, and should be included within the protection scope of the present invention.

Preferably, the opening value of the preset opening D ₀ is determined empirically.

It should be noted that in practical applications, those skilled in the art can calculate the value of the second target opening D2 according to the positional PID control algorithm, or can also calculate the second target opening according to the incremental PID control algorithm The value of D2, etc., this kind of flexible adjustment and change does not deviate from the principle and scope of the present invention, and should be included in the protection scope of the present invention.

Preferably, the specific steps of "calculating the second target opening D 2 according to the preset opening D ₀ , the current TDS value E1, the target TDS value E0 and the adjusted TDS value _E2 of the water outlet 1333" include:

Calculate the second demand adjustment amount △D ₂ =k2×(E0-E2)+k3×E0+k4×(E0-2×E2+E1);

Calculate the second target opening D ₂ =D ₀ +ΔD ₂ ;

Among them, k2 is a proportional coefficient, k3 is an integral coefficient, and k4 is a differential coefficient.

With such a setting, compared with the situation where the second demand adjustment is calculated by the positional PID control algorithm, the calculation of the second demand adjustment by the incremental PID control algorithm can only be based on the TDS of the water outlet 1333 acquired three times. value can be used to calculate the second demand adjustment amount, the calculation is relatively simple, and the calculation error is reduced. At the same time, the second demand adjustment amount can be accurately calculated when the water purifier is faulty, thereby improving the calculation accuracy of the second target opening. performance, thereby improving the accuracy of the TDS value of the water outlet 1333, making the adjusted TDS value of the water outlet 1333 closer to the target TDS value required by the user, and further improving the user experience.

It should be noted that the unit of the opening degree of the water ratio regulating valve 133 is set as %, and the unit of the TDS value is mg/L, so the unit of k1, k2, k3, and k4 is L/100mg for unit unity.

It should also be noted that in practical applications, those skilled in the art can determine the specific values of k2, k3, and k4 based on experience or experiments.

Exemplarily, the current TDS value of the water outlet is set to E1 _j , and the TDS value of the water outlet after adjusting the opening of the water proportional regulating valve to the preset opening degree D ₀ is E2 _j , assuming that the water proportional regulating valve The TDS value of the water outlet can be equal to the target TDS value by adjusting the opening degree of m _j % (that is, △D ₂ ), and the TDS value of the water outlet after setting the opening degree of the water proportional regulating valve to be increased by m _j % is E0 _j , and measure the TDS value E0 _j of the water outlet after the opening of the water proportional regulating valve is increased by m _j %, repeat the above operation, and obtain multiple sets of data of E1 _j , E2 _j , E0 _j corresponding to m _j % , substitute multiple sets of data into the following formula:

ΔD ₂ =k2×(E0-E2)+k3×E0+k4×(E0-2×E2+E1);

The following equation is obtained:

m ₁ %=k2×(E0 ₁ −E2 ₁ )+k3×E0 ₁ +k4×(E0 ₁ −2×E2 ₁ +E1 ₁ );

m ₂ %=k2×(E0 ₂ −E2 ₂ )+k3×E0 ₂ +k4×(E0 ₂ −2×E2 ₂ +E1 ₂ );

m ₃ %=k2×(E0 ₃ −E2 ₃ )+k3×E0 ₃ +k4×(E0 ₃ −2×E2 ₃ +E1 ₃ );

m _j %＝k2×(E0 _j -E2 _j )+k3×E0 _j +k4×(E0 _j -2×E2 _j +E1 _j );

Wherein, j>0.

In the above equations, any three equations are chosen to form a ternary linear equation system containing unknowns k2, k3, k4, and the values of k2, k3, k4 can be calculated by solving the ternary linear equation system.

The specific embodiment of whether it is necessary to adjust the opening degree of the water ratio regulating valve 133 will be introduced in detail below in combination with several situations.

Set A3=-2mg/L, A4=2mg/L.

Scenario 1:

If the current TDS value E1 = 20 mg/L, and the target TDS value E0 = 20 mg/L, then E1 = E0, then the opening degree of the water ratio regulating valve 133 is not adjusted.

Scenario 2:

If the current TDS value E1=21mg/L, the target TDS value E0=20mg/L;

Then Δ3=E0-E1=20-21=-1 mg/L, A3<Δ3<A4, then the opening degree of the water proportional regulating valve 133 is not adjusted.

Case three:

If the current TDS value E1=15mg/L, the target TDS value E0=20mg/L;

Then Δ3=E0-E1=20-15=5mg/L, Δ3>A4, then select the corresponding preset adjustment mode to adjust the opening degree of the water proportional adjustment valve 133 .

Situation 4:

If the current TDS value E1=25mg/L, the target TDS value E0=20mg/L;

Then Δ3=E0-E1=20-25=-5mg/L, Δ3<A3, then select the corresponding preset adjustment mode to adjust the opening degree of the water proportional regulating valve 133 .

It should be noted that in practical applications, those skilled in the art can determine the specific value of A1 based on experience or experiments.

Exemplarily, A1=5mg/L.

A specific embodiment of adjusting the opening degree of the water proportional regulating valve 133 of the present invention will be described in detail below in combination with several situations.

Scenario 1:

If the current TDS value E1=30mg/L, the target TDS value E0=15mg/L;

Then the first difference △1=|E0-E1|=|15-30|=15mg/L, △1>A1;

Then first calculate the first demand adjustment amount ΔD ₁ , and then calculate the first target opening degree D ₁ according to the first demand adjustment amount ΔD ₁ and the current opening degree D _t .

Scenario 2:

If the current TDS value E1=5mg/L, the target TDS value E0=15mg/L;

Then the first difference △1=|E0-E1|=|15-5|=10mg/L, △1>A1;

Then first calculate the first demand adjustment amount ΔD ₁ , and then calculate the first target opening degree D ₁ according to the first demand adjustment amount ΔD ₁ and the current opening degree D _t .

Case three:

If the current TDS value E1=20mg/L, the target TDS value E0=15mg/L;

Then the first difference △1=|E0-E1|=|15-20|=5mg/L, △1=A1;

Then first adjust the opening of the water proportional regulating valve 133 to the preset opening D ₀ , then calculate the second demand adjustment △D ₂ , and then calculate according to the preset opening D0 and the second demand adjustment △D ₂ The second target opening D ₂ .

Situation 4:

If the current TDS value E1=18mg/L, the target TDS value E0=15mg/L;

Then the first difference △1=|E0-E1|=|15-18|=3mg/L, △1<A1;

Then first adjust the opening of the water proportional regulating valve 133 to the preset opening D ₀ , then calculate the second demand adjustment △D ₂ , and then calculate according to the preset opening D0 and the second demand adjustment △D ₂ The second target opening D ₂ .

Scenario five:

If the current TDS value E1=12mg/L, the target TDS value E0=15mg/L;

Then the first difference △1=|E0-E1|=|15-12|=3mg/L, △1<A1;

Then first adjust the opening of the water proportional regulating valve 133 to the preset opening D ₀ , then calculate the second demand adjustment △D ₂ , and then calculate according to the preset opening D0 and the second demand adjustment △D ₂ The second target opening D ₂ .

The calculation process of the first target opening degree _D1 and the second target opening degree _D2 will not be repeated here.

It should be noted that, in practical applications, with the use of the reverse osmosis membrane water purification filter element 131, the TDS value of the water purified by the reverse osmosis membrane water purification filter element 131 will gradually increase, especially when the reverse osmosis membrane water purification filter element 131 is used. After the service life of the filter element 131 reaches the theoretical service life, the TDS value in the first waterway 135 will increase. The water with the target TDS value required by the user, therefore, the user needs to replace the reverse osmosis membrane water purification filter element 131 in time.

It should also be noted that in practical applications, those skilled in the art can regularly replace the reverse osmosis membrane water purification filter element 131 according to experience, or an alarm device can be installed on the water purifier, according to the first waterway 135. The TDS value and the target TDS value selectively activate the alarm device, and the alarm device sends an alarm to prompt the user to replace the reverse osmosis membrane water purification filter element 131, etc. This flexible adjustment and change does not deviate from the principle of the present invention. and scope, should be included in the protection scope of the present invention.

Preferably, as shown in FIG. 1 , the water purifier further includes an alarm device 14 capable of sending an alarm to the user.

Preferably, the control method of the present invention also includes the following steps:

Obtain the TDS value E4 of the water in the first waterway 135;

According to the TDS value E4 of the water in the first waterway 135 and the target TDS value E0, the alarm device 14 is selectively activated.

Through such setting, when the TDS value E4 of the water in the first water channel 135 is higher than the target TDS value E0, no matter how the opening of the water proportional regulating valve 133 is adjusted, the target TDS value required by the user cannot be obtained. At this time, the alarm device 14 can be activated in time to remind the user to replace the reverse osmosis membrane water purification filter element 131, so as to avoid affecting the normal use of the user and further improve the user experience.

It should be noted that, in practical applications, those skilled in the art can set the alarm device 14 as a sound alarm unit, or, also can set the alarm device 14 as a light alarm unit, or, can also set the alarm device 14 as a The alarm unit combined with sound and light, etc., the adjustment and change of the specific setting type of the alarm device 14 do not deviate from the principle and scope of the present invention, and should be included in the protection scope of the present invention.

Preferably, the alarm device 14 is set as an alarm unit combining sound and light.

It should be noted that in practical applications, those skilled in the art can directly compare the TDS value E4 of the water in the first waterway 135 with the target TDS value E0, and selectively activate the alarm device 14 according to the comparison result, or, It is also possible to first calculate the difference between the TDS value E4 of the water in the first waterway 135 and the target TDS value E0, then compare the difference with the preset value, and selectively activate the alarm device 14 according to the comparison result, Alternatively, it is also possible to first calculate the ratio between the TDS value E4 of the water in the first waterway 135 and the target TDS value E0, and selectively start the alarm device 14 according to the comparison result, etc., this flexible adjustment and change Anything that does not deviate from the principle and scope of the present invention should be included in the protection scope of the present invention.

Preferably, the specific steps of "selectively activating the alarm device 14 according to the TDS value E4 of the water in the first waterway 135 and the target TDS value E0" include:

Calculate the second difference Δ2=E0-E4;

Comparing the second difference Δ2 with the second preset value A2;

According to the comparison result, selectively start the alarm device 14;

where A2≥0.

With such an arrangement, compared with the situation of directly comparing the TDS value E4 of the water in the first waterway 135 with the target TDS value E0, the difference between the TDS value E4 of the water in the first waterway 135 and the target TDS value E0 is calculated first. The difference between them, and then comparing the difference with the second preset value A2 can prevent misjudgment caused by the detection error of the TDS value E4 of the water in the first waterway 135, thereby improving the accuracy of judgment.

Preferably, the specific step of "selectively activating the alarm device 14 according to the comparison result" includes: if Δ2>A2, then not activating the alarm device 14 .

Through such setting, when △2>A2, it means that the TDS value of the water in the first water channel 135 is still lower than the target TDS value. , but the water with the target TDS value required by the user can still be called out, that is, the reverse osmosis membrane water purification filter element 131 can still be used continuously, which can reduce the frequency of replacing the reverse osmosis membrane water purification filter element 131, help users save costs, and further improve user performance. use experience.

Preferably, the specific step of "selectively activating the alarm device 14 according to the comparison result" includes: activating the alarm device 14 if Δ2≤A2, and the duration of Δ2≤A2 exceeds a preset time.

Through such setting, on the one hand, when △2≤A2, it means that the TDS value of the water in the first waterway 135 has risen to be relatively close to the target TDS value, and at this time it is very likely that the target TDS value required by the user cannot be obtained. Therefore, start the alarm device 14 to remind the user to replace the reverse osmosis membrane water purification filter element 131 in time, so as not to affect the normal use of the user; When the duration of 2≦A2 exceeds the preset time, the alarm device 14 is activated, which can avoid misjudgment caused by a certain detection error and further improve user experience.

It should be noted that, in practical applications, those skilled in the art can set a TDS sensor on the first waterway 135 to obtain the TDS value E4 in the first waterway 135, or can also set a conductivity meter on the first waterway 135 , feed back the TDS value in the first waterway 135 through the data of the conductivity meter, etc., such flexible adjustments and changes do not deviate from the principle and scope of the present invention, and should be included in the protection scope of the present invention.

Preferably, as shown in FIG. 1 , a second TDS sensor 1351 is provided on the first waterway 135 .

It should be noted that the water purifier of the present invention further includes a controller configured to execute the control method described above.

It should also be noted that in practical applications, those skilled in the art can set the controller to communicate with the first TDS sensor 1341 and the second TDS sensor 1351 in order to realize the intelligent data collection of the water purifier, or the control The controller is set to communicate with the water proportional regulating valve 133, so as to realize the automatic adjustment of the water proportional regulating valve 133, and the controller can also be set to communicate with the alarm device 14, so as to realize the intelligent reminder of the water purifier, thereby further improving the user's use experience.

So far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the accompanying drawings, but those skilled in the art will easily understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principles of the present invention, those skilled in the art can make equivalent changes or substitutions to relevant technical features, and the technical solutions after these changes or substitutions will all fall within the protection scope of the present invention.

Claims (7)

1. The control method for the water purifier is characterized in that the water purifier comprises a pre-filter element, a reverse osmosis membrane water purification filter element, a first waterway, a second waterway, a water proportion regulating valve and a water outlet waterway, wherein the water outlet end of the pre-filter element is communicated with the water inlet end of the reverse osmosis membrane water purification filter element, the water proportion regulating valve is provided with a first water inlet, a second water inlet and a water outlet, one end of the first waterway is communicated with the water outlet end of the reverse osmosis membrane water purification filter element, the other end of the first waterway is communicated with the first water inlet, one end of the second waterway is communicated with the water outlet end of the pre-filter element, the other end of the second waterway is communicated with the second water inlet, the water outlet waterway is communicated with the water outlet, the water inlet amount of the first water inlet is reduced along with the increase of the opening of the water proportion regulating valve, and the water inlet amount of the second water inlet is increased along with the increase of the opening of the water proportion regulating valve.

Acquiring a current TDS value E1 of the water outlet;

obtaining a target TDS value E0;

selectively adjusting the opening degree of the water proportion adjusting valve according to the current TDS value E1 and the target TDS value E0;

the specific step of selectively adjusting the opening degree of the water proportional adjustment valve according to the current TDS value E1 and the target TDS value E0 includes:

judging whether the current TDS value E1 is equal to the target TDS value E0 or not;

if the judgment result is yes, not adjusting the opening degree of the water proportion adjusting valve;

if the judgment result is NO, the opening degree of the water proportion regulating valve is regulated;

the specific steps of adjusting the opening degree of the water proportion adjusting valve comprise:

calculating a first difference Δ1= |e0-e1|;

comparing the first difference delta 1 with a first preset value A1;

according to the comparison result, selecting a corresponding preset adjusting mode to adjust the opening of the water proportion adjusting valve;

wherein A1 > 0;

the specific step of selecting a corresponding preset adjusting mode to adjust the opening degree of the water proportion adjusting valve according to the comparison result comprises the following steps:

if delta 1 is less than or equal to A1, firstly adjusting the opening of the water proportion adjusting valve to be a preset opening D ₀ ；

Obtaining a TDS value E2 of the water outlet after adjustment;

according to the preset opening D ₀ Calculating a second target opening D according to a PID control algorithm by the current TDS value E1, the target TDS value E0 and the adjusted TDS value E2 of the water outlet ₂ ；

Adjusting the opening degree of the water proportion adjusting valve to the second target opening degree D ₂ 。

2. The control method according to claim 1, wherein the specific step of "selecting a corresponding preset adjustment manner to adjust the opening degree of the water proportional adjustment valve according to the comparison result" includes:

if Δ1 > A1, then based on the current TDS value E1 and the target TDS valueE0 calculates a first target opening D ₁ ；

Adjusting the opening degree of the water proportion adjusting valve to the first target opening degree D ₁ 。

3. The control method according to claim 2, characterized in that a first target opening degree D is calculated from the current TDS value E1 and the target TDS value E0 ₁ The specific steps of "comprise:

acquiring the current opening D of the water proportion regulating valve _t ；

Calculating a first demand adjustment amount DeltaD ₁ =k1×( E0- E1)；

Calculating the first target opening D ₁ =D _t +△D ₁ ；

Where k1 is the feed forward coefficient.

4. The control method according to claim 1, characterized in that "according to the preset opening degree D ₀ Calculating a second target opening D from the current TDS value E1, the target TDS value E0 and the adjusted TDS value E2 of the water outlet ₂ The specific steps of "comprise:

calculating a second demand adjustment amount DeltaD ₂ =k2×（E0-E2）+k3×E0+k4×(E0-2×E2+E1)；

Calculating the second target opening D ₂ =D ₀ +△D ₂ ；

Where k2 is the scaling factor, k3 is the integration factor, and k4 is the differentiation factor.

5. The control method according to any one of claims 1 to 4, wherein the water purifier further comprises an alarm device, the control method further comprising:

acquiring a TDS value E4 of water in the first waterway;

and selectively starting the alarm device according to the TDS value E4 and the target TDS value E0 of the water in the first waterway.

6. The control method according to claim 5, wherein the specific step of selectively activating the alarm means according to the TDS value E4 and the target TDS value E0 of the water in the first waterway includes:

calculating a second difference Δ2=e0-E4;

comparing the second difference delta 2 with a second preset value A2;

selectively starting the alarm device according to the comparison result;

wherein A2 is more than or equal to 0.

7. A water purifier comprising a controller configured to be able to perform the control method of any one of claims 1 to 6.