CN115771976A - Water purification equipment and its control method - Google Patents

Abstract

This application relates to a water purification device and its control method. A water purification device includes: a liquid supply main circuit; a water purification branch circuit; a first detection device, a second detection device, a heating device and a membrane filter device. The clean water flow of the clean water branch circuit and the water temperature of the liquid supply main circuit control the opening and closing of the heating device. A control method for water purification equipment, comprising: filtering the water flow in the liquid supply main circuit, and outputting purified water from the water purification branch circuit; detecting the purified water flow rate of the water purification branch circuit; comparing the purified water flow rate with the flow preset value Comparison; when the clean water flow rate is less than the flow preset value, detect the water temperature of the liquid supply main circuit, and turn on the heating device when the water temperature of the liquid supply main circuit is lower than the temperature preset value. The above-mentioned water purification equipment and its control method are beneficial to improving the production rate of water purification and prolonging the service life of the water purification equipment.

Description

Water purification equipment and its control method

technical field

The present application relates to the technical field of water purification, in particular to a water purification device and a control method thereof.

Background technique

Because the membrane filter device is affected by water temperature, water quality and water volume, the water yield of the membrane filter device will be unstable under different water quality and different seasons, resulting in unstable water flow of the water purification equipment, which seriously affects the use of users, and the user experience is poor. Difference.

Contents of the invention

Based on this, it is necessary to provide a water purification device and a control method thereof for the problem of unstable outlet water flow rate of the water purification device.

A water purification device, comprising:

The main liquid supply road is used to input raw water;

The water purification branch communicates with the main liquid supply circuit;

The membrane filter device is arranged between the main liquid supply road and the water purification branch road and is used for filtering;

The first detection device is arranged in the water purification branch and is used to detect the clean water flow of the water purification branch;

The second detection device is arranged on the main liquid supply road and is used to detect the water temperature of the main liquid supply road;

A heating device is installed in the main liquid supply circuit and is used to raise the temperature;

A control unit, electrically connected to the first detection device, the second detection device, and the heating device; the control unit controls the The opening and closing of the heating device.

The above-mentioned water purification equipment outputs the collected purified water flow rate of the water purification branch circuit and the water temperature of the main liquid supply circuit to the control unit, and the control unit controls the heating device according to the purified water flow rate of the water purification branch circuit and the water temperature of the main liquid supply circuit The opening and closing of the membrane filter device keeps the water flow rate constant, which is conducive to improving the water production rate of purified water and prolonging the service life of the membrane filter device.

In one of the embodiments, the water purification equipment further includes a first control valve, the first control valve is set at the water inlet end of the main liquid supply circuit, and the control unit The clean water flow controls the operation of the first control valve.

In one of the embodiments, the water purification equipment further includes a pre-filter device, the pre-filter device is arranged between the first control valve and the heating device, and is used for the raw water of the main liquid supply circuit pre-filtered.

In one of the embodiments, the pre-filtration device includes a plurality of filter elements, the types of the plurality of filter elements are different, and each of the filter elements is connected in series to the main liquid supply path, and the filter membrane device is a reverse osmosis filter membrane or nano filter membrane.

In one of the embodiments, the water purification equipment further includes a pressure regulating device, the pressure regulating device is arranged on the main liquid supply road and located upstream of the membrane filtration device, and the control unit according to the water purification The clean water flow rate of the branch circuit and the water temperature of the main liquid supply circuit control whether the pressure regulating device is pressurized.

In one of the embodiments, the water purification equipment further includes a water quality detection device, a second control valve and a waste water branch, the waste water branch is connected to the main liquid supply road and is not connected to the water purification branch , the second control valve is set on the waste water branch, the water quality detection device is set on the main liquid supply road and is used to detect the raw water soluble total solids value of the main liquid supply road, and the control unit according to The raw water soluble total solids value of the main liquid supply path controls the opening degree of the second control valve.

In one of the embodiments, the water purification equipment further includes a post-filtering device, the post-filtering device is arranged on the water purification branch and is used for filtering the purified water in the water purification branch.

A control method for water purification equipment, comprising:

Filter the water flow in the main liquid supply circuit, and output purified water from the water purification branch circuit;

Detecting the purified water flow rate of the purified water branch;

Comparing the clean water flow with the flow preset value;

When the flow rate of the purified water is greater than the flow preset value, the control heating device is turned off; When the water temperature is lower than the temperature preset value, the heating device is turned on.

The above control method of the water purification equipment is beneficial to improving the production rate of the water purification and prolonging the service life of the water purification equipment at the same time.

In one of the embodiments, before the step of filtering the water flow in the main liquid supply circuit, the step of filtering the water flow in the main liquid supply circuit further includes: Whether the water flow is pressurized.

In one embodiment, including:

When the flow rate of the purified water is greater than the flow preset value, the pressure of the water flow in the main liquid supply circuit is controlled to be in a standard working condition and the heating device is turned off;

When the flow rate of the purified water is less than the flow preset value and the water temperature of the main liquid supply path is ≥25°C, the water flow in the main liquid supply path is controlled to be in pressurized condition and the heating device is turned off;

When the flow rate of the purified water is less than the flow preset value and the water temperature of the main liquid supply path is 15°C to 25°C, control the pressure of the water flow in the main liquid supply path to a standard working condition and turn on the heating device;

When the flow rate of the purified water is less than the preset flow rate and the water temperature of the main liquid supply circuit is ≤15° C., the water flow in the main liquid supply circuit is controlled to be in pressurized condition and the heating device is turned on.

In one of the embodiments, after the step of filtering the water flow in the main liquid supply road, it also includes: connecting the waste water branch with the main liquid supply road, and outputting waste water from the waste water branch; detecting the concentration of raw water in the main liquid supply road. total dissolved solids value, and adjust the waste water flow of the waste water branch according to the total dissolved solids value.

In one of the embodiments, when the total dissolved solids value of the raw water in the main liquid supply road is less than a fixed value, the waste water flow rate of the waste water branch is increased; when the solubility of the raw water in the main liquid supply road is When the total solid value is greater than a fixed value, reduce the waste water flow of the waste water branch; when the soluble total solid value of the raw water in the liquid supply main road is less than or equal to a fixed value, maintain the waste water flow of the waste water branch constant.

In one of the embodiments, the wastewater flow regulation of the wastewater branch is realized by adjusting the opening degree of the second control valve on the wastewater branch.

Description of drawings

Fig. 1 is a schematic diagram of water purification equipment in an embodiment.

Reference signs:

10. Liquid supply main road; 20. Waste water branch; 30. Water purification branch; 100. First detection device; 200. Heating device; 300. Second detection device; 400. Membrane filter device; 500. First control Valve; 600, pre-filter device; 700, pressure regulating device; 800, water quality detection device; 900, second control valve; 901, post-filter device.

Detailed ways

In order to make the above-mentioned purpose, features and advantages of the present application more obvious and understandable, the specific implementation manners of the present application will be described in detail below in conjunction with the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the application. However, the present application can be implemented in many other ways different from those described here, and those skilled in the art can make similar improvements without departing from the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", " Back", "Left", "Right", "Vertical", "Horizontal", "Top", "Bottom", "Inner", "Outer", "Clockwise", "Counterclockwise", "Axial" , "radial", "circumferential" and other indicated orientations or positional relationships are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the application and simplifying the description, rather than indicating or implying the referred device or Elements must have certain orientations, be constructed and operate in certain orientations, and thus should not be construed as limiting the application.

In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be interpreted as indicating or implying relative importance or implicitly specifying the quantity of indicated technical features. Thus, the features defined as "first" and "second" may explicitly or implicitly include at least one of these features. In the description of the present application, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

In this application, terms such as "initial", "connected", "connected" and "fixed" should be interpreted in a broad sense, for example, it may be a fixed connection or a detachable connection, unless otherwise clearly specified and limited. , or integrated; it may be mechanically connected or electrically connected; it may be directly connected or indirectly connected through an intermediary, and it may be the internal communication of two components or the interaction relationship between two components, unless otherwise specified limit. Those of ordinary skill in the art can understand the specific meanings of the above terms in this application according to specific situations.

In the present application, unless otherwise clearly specified and limited, a first feature being "on" or "under" a second feature may mean that the first and second features are in direct contact, or that the first and second features are indirect through an intermediary. touch. Moreover, "above", "above" and "above" the first feature on the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. "Below", "beneath" and "beneath" the first feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is less horizontally than the second feature.

It should be noted that when an element is referred to as being “fixed on” or “disposed on” another element, it may be directly on the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or intervening elements may also be present. As used herein, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions are for the purpose of illustration only and are not intended to represent the only embodiment.

Please refer to FIG. 1 , the water purification equipment in one embodiment includes a liquid supply main circuit 10, a water purification branch circuit 30, a first detection device 100, a heating device 200, a second detection device 300, a membrane filter device 400 and a control unit, The main liquid supply road 10 is used to input raw water, the water purification branch 30 communicates with the main liquid supply road 10, the membrane filter device 400 is arranged between the main liquid supply road 10 and the water purification branch 30 and is used for filtering, the first detection device 100 is located in the water purification branch 30 and is used to detect the purified water flow of the water purification branch 30, the second detection device 300 is located in the main liquid supply road 10 and is used to detect the water temperature of the main liquid supply road 10, and the heating device 200 is located in the water supply main road 10. The liquid main road 10 is also used for heating.

Wherein, the control unit is electrically connected with the first detection device 100, the second detection device 300, and the heating device 200, and the control unit controls the opening and closing of the heating device 200 according to the water purification flow rate of the water purification branch circuit 30 and the water temperature of the liquid supply main circuit 10. .

It should be noted that when the water purification equipment is in the water purification mode, the raw water in the main liquid supply path 10 is filtered and purified by the membrane filter device 400, and the flow rate and temperature of the water input to the membrane filter device 400 will affect the outlet water flow rate of the membrane filter device 40. .

The above-mentioned water purification equipment outputs the collected purified water flow rate of the water purification branch 30 and the water temperature of the liquid supply main circuit 10 to the control unit, and the control unit is based on the purified water flow rate of the water purification branch 30 and the temperature of the liquid supply main circuit 10. The water temperature controls the opening and closing of the heating device 200, so that the outlet water flow rate of the membrane filtration device 400 remains constant, which is beneficial to improving the water production rate of purified water and prolonging the service life of the membrane filtration device 400 at the same time.

In the above embodiment, no matter whether the first detection device 100, the heating device 200, the second detection device 300, and the filter membrane device 400 are turned on or not, the conduction state of the liquid supply main circuit 10, that is, the liquid supply main circuit will not be affected. The conduction state of 10 is not related to the opening and closing of the first detection device 100 , the heating device 200 , the second detection device 300 , and the filter membrane device 400 .

In this embodiment, the first detection device 100 is a flow meter, the second detection device 300 is a temperature probe, the control unit is a controller, and the heating device 200 is a tube heater or other types of heating equipment. In other embodiments, the first detection device 100 , the second detection device 300 , and the heating device 200 may also be other types of components.

Please refer to Fig. 1, the water purification equipment also includes a first control valve 500, the first control valve 500 is arranged at the water inlet end of the main liquid supply circuit 10, and the control unit controls the first control valve according to the purified water flow rate of the water purification branch circuit 30 500 opening.

It should be noted that the opening and closing of the main liquid supply circuit 10 is controlled by the first control valve 500 . For example, when the water purification device is in the water purification mode, the main liquid supply circuit 10 is controlled to be opened; when the water purification device is in the cleaning mode, the main liquid supply circuit 10 is controlled to be closed and then opened.

Further, the water flow rate of the main liquid supply circuit 10 can also be controlled through the first control valve 500 .

In this embodiment, the first control valve 500 is a solenoid valve. In other embodiments, the first control valve 500 may also be other types of automatic control valves or manually controlled mechanical valves.

Please refer to FIG. 1 , the water purification equipment further includes a pre-filter device 600 , which is arranged between the first control valve 500 and the heating device 200 and is used for pre-filtering the raw water in the liquid supply main circuit 10 .

Specifically, the pre-filter device 600 includes a plurality of filter elements of different types and each filter element is connected in series to the main liquid supply path 10 , and the filter membrane device 400 is a reverse osmosis filter membrane or a nanofiltration membrane.

Here, each filter element may be a PP cotton filter element, a granular activated carbon filter element, and a compressed activated carbon filter element connected in series in sequence. After the impurities in the raw water are preliminarily filtered by the pre-filter device 600 , the raw water is filtered and purified by the membrane filter device 400 , which effectively prevents large particles of impurities from clogging the membrane filter device 400 and can increase the service life of the membrane filter device 400 .

Please refer to Fig. 1, the water purification equipment also includes a pressure regulating device 700, the pressure regulating device 700 is located in the liquid supply main road 10 and is positioned at the upstream of the membrane filter device 400, the control unit according to the purified water flow and the liquid supply of the water purification branch 30 The water temperature of the main circuit 10 controls whether the pressure regulating device 700 is pressurized.

It can be understood that both the flow rate and the temperature of the water input into the membrane filtration device 400 will affect the flow rate of the water output from the membrane filtration device 40 . Before the water flow enters the membrane filtration device 400 , the water flow can be pressurized by the pressure regulating device 700 , so as to increase the outlet water flow rate of the membrane filtration device 400 . For example, when the water flow rate is too small and the temperature is too low, the outlet water flow rate of the membrane filter device 400 will be reduced. At this time, the pressure regulating device 700 can be used to pressurize the water flow, thereby increasing the outlet water flow rate of the membrane filter device 400 .

Optionally, the pressure regulating device 700 is an adjustable booster pump.

Please refer to Fig. 1, the water purification equipment also includes a water quality detection device 800, a second control valve 900 and a waste water branch 20, the waste water branch 20 is connected to the liquid supply main road 10, and the second control valve 900 is located at the waste water branch 20, The water quality detection device 800 is set in the main liquid supply road 10 and is used to detect the raw water soluble total solids value of the liquid supply main road 10, and the control unit controls the opening of the second control valve 900 according to the raw water soluble total solids value of the liquid supply main road 10. Spend.

It should be noted that after the raw water in the main liquid supply path 10 is filtered by the membrane filter device 400 , waste water will be discharged through the waste water branch path 20 . The water quality of the raw water can be judged by detecting the raw water soluble total solids value of the main liquid supply channel 10 by the water quality detection device 800 , and the opening degree of the second control valve 900 can be controlled according to the water quality.

For example, when the total dissolved solids value of the raw water is low, it indicates that the water quality is better. At this time, the opening degree of the second control valve 900 is increased, and the water purification equipment is in the mode of high recovery rate of waste water; when the total dissolved solids value of the raw water is high , it means that the water quality is poor. At this time, the opening of the second control valve 900 can be reduced, and the water purification equipment is in the low recovery rate mode of wastewater.

Optionally, the water quality detection device 800 is a TDS probe, and the second control valve 900 is a solenoid valve or a mechanical valve.

Further, please refer to FIG. 1 , the water purifying equipment further includes a post-filtering device 901 , and the post-filtering device 901 is arranged on the water purifying branch 30 and is used for filtering the purified water in the water purifying branch 30 .

Specifically, the post-filter device 901 is an ultrafiltration composite filter element or a granular activated carbon filter element. After the water in the main liquid supply path 10 is filtered by the membrane filter device 400 , purified water will be output through the water purification branch path 30 for use by users. Passing through the post-filtering device 901 can further improve the taste of the purified water and improve user experience.

Please refer to Fig. 1, the control method of the water purification equipment in an embodiment includes the following steps:

Filter the water flow in the liquid supply main circuit 10, and output purified water from the water purification branch circuit 30;

Detect the purified water flow of the purified water branch 30;

Compare the clean water flow with the flow preset value;

When the clean water flow is greater than the flow preset value, control the heating device 200 to turn off; when the clean water flow is less than the flow preset value, detect the water temperature of the liquid supply main circuit 10, and the water temperature in the liquid supply main circuit 10 is lower than the temperature preset Turn on the heating device 200 when the value is .

In the control method of the above-mentioned water purification equipment, the control unit controls the opening and closing of the heating device 200 according to the water purification flow rate of the water purification branch circuit 30 and the water temperature of the liquid supply main circuit 10, so that the water outlet flow rate of the water purification equipment remains constant, which is conducive to improving the water purification efficiency. The water production rate is improved, and the service life of the water purification equipment is extended at the same time.

Please refer to Fig. 1, before the step of filtering the water flow in the liquid supply main road 10, it also includes: according to the water flow of the purified water branch 30 and the water temperature of the liquid supply main road 10, it is determined whether to increase the water flow in the liquid supply main road 10. pressure.

It can be understood that both the flow rate and temperature of the water flow in the main liquid supply path 10 will affect the flow rate of the outlet water of the membrane filtration device 400 . Before the water flow enters the membrane filtration device 400 , the water flow can be pressurized by the pressure regulating device 700 , so as to increase the outlet water flow rate of the membrane filtration device 400 .

Specifically, as shown in Figure 1, when the flow of clean water is greater than the flow preset value, the pressure of the water flow in the main liquid supply circuit 10 is controlled to be in a standard working condition and the heating device 200 is turned off; when the flow of clean water is less than the flow preset value and the supply When the water temperature in the main liquid supply path 10 is ≥25°C, the water flow in the main liquid supply path 10 is controlled to be in pressurized condition and the heating device 200 is turned off; At 25°C, control the pressure of the water flow in the main liquid supply path 10 to be in the standard working condition and the heating device 200 is turned on; The water flow inside is in pressurized condition and the heating device 200 is turned on.

It should be noted that the difference between the standard working condition and the pressurized working condition is that the pressure on the water flow is different, and the pressure on the water flow is realized by adjusting the input voltage of the pressure regulating device 700 .

Please refer to Fig. 1, after the step of filtering the raw water in the liquid supply main road 10, it also includes: connecting the waste water branch 20 with the liquid supply main road 10, and outputting waste water from the waste water branch 20; detecting the raw water in the liquid supply main road 10 The total dissolved solids value, and adjust the waste water flow of the waste water branch 20 according to the total dissolved solids value.

It should be noted that after the raw water in the main liquid supply path 10 is filtered by the membrane filter device 400 , waste water will be discharged through the waste water branch path 20 . By detecting the total dissolved solids value of the raw water in the main liquid supply path 10 , the water quality of the raw water can be judged, and the waste water flow rate of the waste water branch 20 can be adjusted according to the water quality.

Specifically, as shown in Figure 1, when the total soluble solids value of raw water in the main liquid supply road 10 is less than a fixed value, increase the waste water flow rate of the waste water branch 20; when the total soluble solids of raw water in the main liquid supply road 10 When the solid value is greater than the fixed value, reduce the waste water flow of the waste water branch 20; when the total dissolved solids value of the raw water in the liquid supply main road 10 is less than or equal to the fixed value, keep the waste water flow of the waste water branch 20 unchanged.

Specifically in this embodiment, the wastewater flow adjustment of the wastewater branch 20 is realized by adjusting the opening of the second control valve 900 on the wastewater branch 20 .

For example, when the opening of the second control valve 900 increases, the waste water flow in the waste water branch 20 will increase; when the opening of the second control valve 900 decreases, the waste water flow in the waste water branch 20 will decrease.

The technical features of the above-mentioned embodiments can be combined arbitrarily. To make the description concise, all possible combinations of the technical features in the above-mentioned embodiments are not described. However, as long as there is no contradiction in the combination of these technical features, should be considered as within the scope of this specification.

The above-mentioned embodiments only represent several implementation modes of the present application, and the description thereof is relatively specific and detailed, but it should not be construed as limiting the scope of the patent for the invention. It should be noted that those skilled in the art can make several modifications and improvements without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the scope of protection of the patent application should be based on the appended claims.

Claims (13)

1. A water purification apparatus, comprising:

a main liquid supply path (10) for inputting raw water;

a water purification branch (30) communicated with the main liquid supply path (10);

the filter membrane device (400) is arranged between the main liquid supply path (10) and the water purification branch path (30) and is used for filtering;

the first detection device (100) is arranged on the water purification branch (30) and is used for detecting the water purification flow of the water purification branch (30);

the second detection device (300) is arranged on the liquid supply main circuit (10) and is used for detecting the water temperature of the liquid supply main circuit (10);

the heating device (200) is arranged in the liquid supply main path (10) and is used for heating;

a control unit electrically connected to the first detection device (100), the second detection device (300), and the heating device (200); the control unit controls the heating device (200) to be opened or closed according to the purified water flow of the purified water branch (30) and the water temperature of the liquid supply main path (10).

2. The water purification apparatus according to claim 1, further comprising a first control valve (500), wherein the first control valve (500) is disposed at a water inlet end of the main liquid supply path (10), and the control unit controls an opening degree of the first control valve (500) according to a purified water flow of the purified water branch path (30).

3. The water purification apparatus according to claim 2, further comprising a pre-filtering device (600), wherein the pre-filtering device (600) is disposed between the first control valve (500) and the heating device (200) and is used for pre-filtering raw water of the main liquid supply path (10).

4. The water purification apparatus of claim 3, wherein the pre-filtering device (600) comprises a plurality of filter elements, the filter elements are different in type and are connected in series with the main liquid supply path (10), and the filter membrane device (400) is a reverse osmosis filter membrane or a nanofiltration membrane.

5. The water purification apparatus according to claim 1, further comprising a pressure regulating device (700), wherein the pressure regulating device (700) is disposed in the main liquid supply path (10) and located upstream of the membrane device (400), and the control unit controls whether the pressure regulating device (700) is pressurized or not according to the purified water flow rate of the purified water branch (30) and the water temperature of the main liquid supply path (10).

6. The water purifying apparatus according to claim 1, further comprising a water quality detecting device (800), a second control valve (900) and a waste water branch (20), wherein the waste water branch (20) is connected to the main liquid supply path (10) and is not connected to the water purifying branch (30), the second control valve (900) is disposed in the waste water branch (20), the water quality detecting device (800) is disposed in the main liquid supply path (10) and is configured to detect a total solid value of raw water solubility of the main liquid supply path (10), and the control unit controls an opening degree of the second control valve (900) according to the total solid value of raw water solubility of the main liquid supply path (10).

7. The water purifying apparatus of claim 6, further comprising a post-filtering device (901), wherein the post-filtering device (901) is disposed on the water purifying branch (30) and is used for filtering purified water of the water purifying branch (30).

8. A control method of a water purifying apparatus, comprising:

filtering the water flow in the main liquid supply path (10), and outputting purified water by the purified water branch path (30);

detecting the purified water flow of the purified water branch (30);

comparing the purified water flow with a preset flow value;

when the flow of the purified water is greater than a preset flow value, controlling the heating device (200) to be closed; when the flow of the purified water is smaller than a preset flow value, the water temperature of the main liquid supply path (10) is detected, and the heating device (200) is started when the water temperature of the main liquid supply path (10) is smaller than a preset temperature value.

9. The control method of water purification apparatus according to claim 8, wherein the step of filtering the water flow in the main liquid supply path (10) is preceded by the steps of:

and determining whether the water flow in the main liquid supply path (10) is pressurized or not according to the purified water flow of the purified water branch (30) and the water temperature of the main liquid supply path (10).

10. The control method of a water purifying apparatus as claimed in claim 9, comprising:

when the flow rate of the purified water is greater than a preset flow rate value, controlling the water flow pressure in the main liquid supply path (10) to be in a standard condition and turning off the heating device (200);

when the flow of the purified water is smaller than a preset flow value and the water temperature of the main liquid supply path (10) is more than or equal to 25 ℃, controlling the water flow in the main liquid supply path (10) to be in a pressurization condition and turning off the heating device (200);

when the flow rate of the purified water is smaller than the preset flow rate value and the water temperature of the main liquid supply path (10) is 15-25 ℃, controlling the water flow pressure in the main liquid supply path (10) to be in a standard working condition and starting the heating device (200);

when the flow rate of the purified water is smaller than the preset flow rate and the water temperature of the main liquid supply path (10) is less than or equal to 15 ℃, controlling the water flow in the main liquid supply path (10) to be in a pressurization condition and starting the heating device (200).

11. The control method of water purification apparatus according to claim 10, wherein the step of filtering the water flow in the main liquid supply path (10) is followed by the steps of:

communicating a waste water branch (20) with the main liquid supply path (10), and outputting waste water by the waste water branch (20);

and detecting the total soluble solid value of raw water in the main liquid supply path (10), and adjusting the wastewater flow of the wastewater branch path (20) according to the total soluble solid value.

12. The control method of water purification apparatus as claimed in claim 11, wherein when the total solid value of solubility of raw water in the main liquid supply path (10) is less than a fixed value, the flow rate of the waste water in the waste water branch path (20) is increased; when the total dissolved solid value of raw water in the main liquid supply path (10) is larger than a fixed value, the flow of the waste water branch path (20) is reduced; when the total dissolved solid value of raw water in the main liquid supply path (10) is less than or equal to a fixed value, the flow rate of the waste water branch path (20) is kept unchanged.

13. The control method of a water purification apparatus according to claim 11, wherein the adjustment of the wastewater flow rate of the wastewater branch (20) is performed by adjusting the opening degree of a second control valve (900) on the wastewater branch (20).

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