CN117208985A - Water purifying device and control method - Google Patents

Abstract

The invention relates to the technical field of water purification, in particular to a water purification device and a control method, and aims to solve the problem that scaling of a filtering membrane in the existing water purification device is difficult to clean. For this purpose, the water purifying device provided by the invention comprises a first filter, wherein the first filter can purify water quality; the water purification device is connected with a cleaning tank, and a scale remover is filled in the cleaning tank and is configured to be injected into the water purification device and remove scale in the first filter. And injecting a descaling agent into the water purifying device, and enabling the descaling agent to flow through the filtering membrane of the first filter, so that scale on the filtering membrane is removed by using the descaling agent.

Description

Water purifying device and control method

Technical Field

The invention relates to the technical field of water purification, and particularly provides a water purification device and a control method.

Background

Along with the improvement of life quality of people, the requirements on the quality of drinking water are also higher and higher, so that the application of the water purifying device is also wider and wider.

Most of the filtration membranes in the current water purifying devices are reverse osmosis filtration membranes or nanofiltration membranes so as to purify raw water. Under the working condition that the raw water has high hardness, the ion concentration on the surface of the filtering membrane is high, and the surface of the filtering membrane is easy to scale after long-time use, so that the filtering capability of the filtering membrane is seriously reduced. Dirt on the surface of the filtering membrane is difficult to clean, and the filtering membrane needs to be replaced, so that the use cost of the water purifying device is high.

Therefore, a water purifying device and a control method are needed to solve the problem that the scaling of the filtering membrane in the existing water purifying device is difficult to clean.

Disclosure of Invention

The invention aims to solve the technical problems, namely the problem that the scaling of a filtering membrane is difficult to remove in the existing water purifying device.

In a first aspect, the present invention provides a water purification apparatus comprising a first filter capable of purifying water; the water purification device is connected with a cleaning tank, and the cleaning tank is filled with a descaling agent, wherein the descaling agent is configured to be injected into the water purification device and remove scale in the first filter.

In a specific embodiment of the water purifying device, the first filter is connected with a first water inlet pipe and a waste pipe, a first pipe is connected between the first water inlet pipe and the waste pipe, and a booster pump is arranged on the first water inlet pipe, the waste pipe or the first pipe; the first pipe, part of the first water inlet pipe, the first filter and part of the waste pipe can form a circulating pipeline, the cleaning tank is connected to the circulating pipeline or the first water inlet pipe, and the booster pump is connected to the circulating pipeline; the first water inlet pipe, the first filter and the waste pipe can form a water purifying pipeline.

In a specific embodiment of the water purifying device, the first pipe is provided with a first valve to control on-off of the first pipe, the first water inlet pipe is provided with a second valve to control on-off of the first water inlet pipe, and the waste pipe is provided with a third valve to control on-off of the waste pipe; the connection of the first pipe and the first water inlet pipe is positioned between the second valve and the first filter, and the connection of the first pipe and the waste pipe is positioned between the third valve and the first filter; the first, second, and third valves are configured to: the first valve is opened, the second valve and the third valve are closed, the circulation pipeline is opened, and the clean water pipeline is closed; the first valve is closed, the second valve and the third valve are opened, the clean water pipeline is opened, and the circulation pipeline is closed.

In the specific embodiment of the water purifying device, the first filter is further connected with a first water outlet pipe, a second pipe is connected between the first water outlet pipe and the waste water pipe, and a fourth valve is arranged on the second pipe to control the on-off of the second pipe; the fourth valve is configured to: the fourth valve is opened, and the first water outlet pipe is communicated with the waste pipe so that water flowing through the first water outlet pipe is discharged into the waste pipe; the fourth valve is closed, and the first water outlet pipe and the waste pipe are isolated from each other.

In a specific embodiment of the above water purifying device, the first water outlet pipe is provided with a switch valve to control on-off of the first water outlet pipe, and the switch valve is arranged between the second pipe and the first filter; and/or a third one-way valve is arranged on the first water outlet pipe and is configured to enable operation liquid to flow out of the first water outlet pipe.

In a specific embodiment of the above water purification device, a fourth one-way valve is further provided on the second pipe, the fourth one-way valve being configured to allow liquid to flow to the waste pipe.

In a specific embodiment of the water purifying device, a fifth valve is arranged at the outlet of the cleaning tank to control the on-off of the outlet of the cleaning tank; and/or the outlet of the purge tank is provided with a first one-way valve configured to allow liquid to flow out of the purge tank; and/or a second one-way valve is arranged on the first water inlet pipe, and the second one-way valve is configured to allow liquid to flow to the first filter; and/or the waste pipe is also provided with a waste valve, and the waste valve can control the flow of the waste pipe.

In a second aspect, the present invention provides a control method of a water purifying apparatus, the control method comprising: obtaining the filth blockage condition of a filter element in the first filter; and controlling the water purifying device to clean according to the dirt blocking degree of the filter element in the first filter.

In a specific embodiment of the above control method of a water purifying apparatus, "controlling the water purifying apparatus to clean according to the clogging degree of the filter element in the first filter" includes: if the filter element in the first filter is dirty and blocked, controlling the water purifying device to clean; and/or if the filter element of the first filter is not blocked, controlling the water purifying device not to clean.

In a specific embodiment of the above control method of a water purifying apparatus, "controlling the water purifying apparatus to perform cleaning" includes: the cleaning tank injects the descaling agent into the water purifying device; opening the circulation pipeline and closing the water purification pipeline to circulate the water containing the descaling agent in the circulation pipeline; and opening the water purifying pipeline and closing the circulating pipeline to enable the water containing the descaling agent to be discharged out of the water purifying device.

Compared with the prior art, the invention has the following beneficial effects:

the water purifying device provided by the invention comprises a first filter, wherein the first filter can purify water quality; the water purification device is connected with a cleaning tank, and a scale remover is filled in the cleaning tank and is configured to be injected into the water purification device and remove scale in the first filter. And injecting a descaling agent into the water purifying device, and enabling the descaling agent to flow through the filtering membrane of the first filter, so that scale on the filtering membrane is removed by using the descaling agent.

Further, the first filter is connected with a first water inlet pipe and a waste pipe, a first pipe is connected between the first water inlet pipe and the waste pipe, and a booster pump is arranged on the first water inlet pipe, the waste pipe or the first pipe; the first pipe, part of the first water inlet pipe, the first filter and part of the waste pipe can form a circulating pipeline, the cleaning tank is connected with the circulating pipeline or the first water inlet pipe, and the booster pump is connected with the circulating pipeline; the first inlet tube, the first filter and the waste can form a clean water line. The cleaning tank injects the descaling agent into the water purifying device, then the circulating pipeline is controlled to be opened, the water purifying pipeline is closed, and the booster pump is controlled to be opened, so that the water containing the descaling agent circulates in the circulating pipeline, and the descaling agent is ensured to be fully contacted with the scale on the surface of the filtering membrane, so that the descaling effect is ensured.

Drawings

Preferred embodiments of the present invention are described below with reference to the accompanying drawings, in which:

FIG. 1 is a circuit diagram of a water purifying apparatus according to an embodiment of the present invention;

FIG. 2 is a circuit diagram of a water purification apparatus according to some embodiments of the present invention;

FIG. 3 is a circuit diagram of a water purifying apparatus according to other embodiments of the present invention;

FIG. 4 is a flow chart of the main steps of the control method of the water purifying device of the present invention;

fig. 5 is a flowchart showing detailed steps of a control method of the water purifying apparatus of the present invention.

Reference numerals illustrate:

1. a first filter; 11. a first water inlet pipe; 111. a booster pump; 12. a first water outlet pipe; 121. a switch valve; 13. a waste pipe; 131. a waste water valve; 2. a second filter; 21. a second water inlet pipe; 22. a second water outlet pipe; 3. a first tube; 4. a cleaning tank; 51. a first valve; 52. a second valve; 53. a third valve; 54. a fourth valve; 55. a fifth valve; 56. a first one-way valve; 57. a second one-way valve; 58. a third one-way valve; 59. a fourth one-way valve; 6. and a second tube.

Detailed Description

Preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are merely for explaining the technical principles of the present invention, and are not intended to limit the scope of the present invention.

It should be noted that, in the description of the present invention, terms such as "upper," "lower," "left," "right," "inner," "outer," and the like indicate directions or positional relationships based on the directions or positional relationships shown in the drawings, which are merely for convenience of description, and do not indicate or imply that the apparatus or elements must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

Furthermore, it should be noted that, in the description of the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "configured," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be directly connected, can be indirectly connected through an intermediate medium, and can also be communicated with the inside of two elements. The specific meaning of the above terms in the present invention can be understood by those skilled in the art according to the specific circumstances.

The invention provides a water purifying device, which aims to solve the problem that scaling of a filtering membrane in the existing water purifying device is difficult to clean. As shown in fig. 1, the water purifying apparatus includes a first filter 1, a second filter 2, and a washing tank 4. The second filter 2 and the first filter 1 are connected in sequence, raw water firstly enters the second filter 2 for preliminary filtration, and then enters the first filter 1 for secondary filtration, so that pure water is obtained. The cleaning tank 4 is filled with a scale remover. The detergent in the cleaning tank 4 can be injected into the water purifying apparatus, and the detergent can react with scale to remove the scale. The scale is generally calcium carbonate, magnesium carbonate and the like, and the scale can be removed easily by using an acidic scale remover, such as hydroxy-tricarboxylic acid, acetic acid, citric acid or the like. Of course, in some other embodiments, the detergent may also use alkali or other solvents that react with the scale to dissolve the scale.

The filter element in the first filter 1 is generally activated carbon to realize preliminary filtration of impurities in raw water. The filter membrane in the filter cartridge of the second filter 2 is typically a reverse osmosis filter membrane or a nanofiltration membrane. After raw water flows through the reverse osmosis filter membrane or the nanofiltration membrane, part of water is filtered by the reverse osmosis filter membrane or the nanofiltration membrane to form pure water, and the impurity concentration in the rest of water is increased to form wastewater and then discharged.

The first filter 1 is connected with a first water inlet pipe 11, a first water outlet pipe 12 and a waste pipe 13, and the second filter 2 is connected with a second water inlet pipe 21 and a second water outlet pipe 22. Wherein the second outlet pipe 22 communicates with the first inlet pipe 11. The first inlet pipe 11, the first filter 1 and the waste pipe 13 can form a clean water line. The water flow first flows into the second filter 2 from the second water inlet pipe 21, flows into the first water inlet pipe 11 from the second water outlet pipe 22 after preliminary filtration in the second filter 2, enters the first filter 1, and is filtered in the first filter 1, the generated pure water flows out from the first water outlet pipe 12, and the rest of the waste water flows out from the waste water pipe 13.

The water flowing through the first water inlet pipe 11 and the waste pipe 13 is located at one side of the filtering membrane in the first filter 1, and the water flowing through the first water outlet pipe 12 is located at the other side of the filtering membrane in the first filter 1. The waste water pipe 13 is provided with a waste water valve 131, and the waste water valve 131 can adjust the opening degree to adjust the discharge speed of waste water through the waste water pipe 13. In the normal working process of the first filter 1, the waste water valve 131 keeps a smaller opening degree, and water can be always discharged from the waste water pipe 13 while the water pressure is kept, namely, a part of water entering the first water inlet pipe 11 always flows to the waste water pipe 13, so that waste water with higher concentration is discharged from the waste water pipe 13, and the service life of the filtering membrane is prevented from being influenced due to the fact that the impurity concentration of water at one side of the filtering membrane is too high. The scaling side of the filtering membrane is the side through which raw water and wastewater flow.

A first pipe 3 is connected between the first water inlet pipe 11 and the waste pipe 13, and the first pipe 3 can be communicated with the first water inlet pipe 11 and the waste pipe 13, so that the first pipe 3, part of the first water inlet pipe 11, the first filter 1 and part of the waste pipe 13 form a circulating pipeline. The first water inlet pipe 11 is provided with a booster pump 111, and the joint of the first pipe 3 and the first water inlet pipe 11 is positioned between the booster pump 111 and the second water outlet pipe 22. The cleaning tank 4 injects the descaling agent into the water purifying device, then controls the circulation pipeline to be opened and the water purifying pipeline to be closed, and the booster pump 111 is opened, so that the water containing the descaling agent circulates in the circulation pipeline, and the descaling agent is ensured to be fully contacted with the scale on the surface of the filtering membrane, so that the descaling effect is ensured. In addition, in the case where the circulation line is closed and the water purifying line is opened, the booster pump 111 can also boost the water pressure in the first filter 1 to enhance the water purifying efficiency.

The cleaning tank 4 firstly adds the scale remover into the water purifying device and then controls the circulation pipeline to be opened, and at the moment, the outlet of the cleaning tank 4 needs to be arranged on the first water inlet pipe 11. The cleaning tank 4 has no closed pipeline in the water purifying device in the process of adding the descaling agent, so that the water pressure in the pipeline of the water purifying device cannot be increased, and the pipeline is not easy to cause water pressure impact.

Of course, in other embodiments, the circulation line may be controlled to be opened first, and then the cleaning tank 4 may be made to add the detergent into the water purifying apparatus, and in this case, the outlet of the cleaning tank 4 needs to be disposed on the circulation line so that the detergent in the cleaning tank 4 can be added into the circulation line.

It should be noted that although the booster pump 111 is provided on the first water intake pipe 11 in the embodiment of the present invention, this is not a specific limitation of the present invention, and in other embodiments, the booster pump 111 may be provided at any position of the circulation line so that the water containing the detergent circulates in the circulation line by those skilled in the art without departing from the principles of the present invention.

In the embodiment of the present invention, the outlet of the purge tank 4 is connected to the first water inlet pipe 11 between the booster pump 111 and the first filter 1. It should be noted that this is not a specific limitation of the present invention, and in other embodiments, the outlet of the cleaning tank 4 may be connected to any position of the circulation line, as shown in fig. 2, to the waste liquid pipe between the first filter 1 and the first pipe 3, or to the first pipe 3, without departing from the principle of the present invention.

The water purifying device is also provided with a valve group, and the circulating pipeline can be opened and the water purifying pipeline is closed or the water purifying pipeline is opened and the circulating pipeline is closed by utilizing the valve group switching. Specifically, the valve block includes a first valve 51, a second valve 52, and a third valve 53. A first valve 51 is provided on the first pipe 3 to control the on-off of the first pipe 3. The second valve 52 is provided on the first inlet pipe 11 to control the on-off of the second inlet pipe 21. A third valve 53 is provided on the waste pipe 13 to control the on-off of the waste pipe 13. The connection between the first pipe 3 and the first water inlet pipe 11 is located between the second valve 52 and the first filter 1, and the connection between the first pipe 3 and the waste pipe 13 is located between the third valve 53 and the first filter 1. When the first valve 51 is opened and the second valve 52 and the third valve 53 are closed, the circulation line is opened and the clean water line is closed, the booster pump 111 is started, and the water containing the detergent can circulate in the circulation line, so that the detergent is fully contacted with the scale on the filtering membrane. Closing the first valve 51 and opening the second valve 52 and the third valve 53, the circulation line is closed and the clean water line is opened, and the booster pump 111 is started, so that the water pressure in the first filter 1 can be raised to raise the clean water efficiency.

In the example of the present invention, the waste water valve 131 is provided at a side of the third valve 53 remote from the first filter 1. As shown in fig. 3, in other examples, the waste water valve 131 may also be provided between the third valve 53 and the first filter 1.

In some embodiments, a second pipe 6 is also connected between the first water outlet pipe 12 and the waste pipe 13, the second pipe 6 being capable of communicating the first water outlet pipe 12 with the waste pipe 13. The valve block further includes a fourth valve 54, and the fourth valve 54 is disposed on the second pipe 6 to control on-off of the second pipe 6. During the circulation of the water containing the detergent in the circulation line, some of the ions may pass through the filtering membrane and enter the first water outlet pipe 12, thereby contaminating the water in the first water outlet pipe 12. After the fourth valve 54 is opened, the first water outlet pipe 12 can communicate with the waste pipe 13, and the contaminated water in the first water outlet pipe 12 is discharged into the waste pipe 13. It should be noted that, even if the water purifying device enters the water purifying mode after the descaling, the fourth valve 54 is still opened for a period of time, and the newly generated pure water is used to flush the first water outlet pipe 12, so as to ensure that the water flowing out from the first water outlet pipe 12 meets the requirement.

A TDS (Total dissolved solids) probe may be provided on the first outlet pipe 12, and the TDS probe is capable of detecting the total amount of soluble solids in water, i.e. detecting the water quality of the first outlet pipe 12. Whether the sewage in the first water outlet pipe 12 is discharged cleanly can be judged according to the water quality of the first water outlet pipe 12.

The valve block further comprises a fifth valve 55. A fifth valve 55 is provided at the outlet of the wash tank 4 to control the on-off of the outlet of the wash tank 4. The purge tank 4 is specifically a pressure tank, and since the rate of water output from the pressure tank is not uniform, the rate of water output decays from fast to slow, and as the number of times the fifth valve 55 is opened increases, the opening time of the fifth valve 55 also needs to be prolonged.

Although the cleaning tank 4 is a pressure tank in the embodiment of the present invention, this is not a specific limitation of the present invention, and in other embodiments, the cleaning tank 4 may be provided as another tank body, and a scale remover may be added to the water purifying apparatus by a plunger pump, a peristaltic pump, or the like, without departing from the principle of the present invention.

In addition, the outlet of the wash tank 4 is provided with a first non-return valve 56, the first non-return valve 56 being arranged between the fifth valve 55 and the first inlet pipe 11, the first non-return valve 56 being configured to allow liquid to flow out of the wash tank 4 in order to prevent the water pressure of the first inlet pipe 11 from being too high to cause a backflow of water into the wash tank 4. The first water inlet pipe 11 is provided with a second one-way valve 57, the second one-way valve 57 is arranged between the second valve 52 and the first filter 1, and the second one-way valve 57 is configured to allow liquid to flow to the first filter 1 so as to prevent water flowing in the circulation pipeline from flowing backwards to the second water outlet pipe 22 in the process of starting water circulation. A third one-way valve 58 is provided on the first outlet pipe 12, the third one-way valve 58 being configured to operate the outflow of liquid from the first outlet pipe 12 so as to prevent the pure water in the first outlet pipe 12 from flowing backwards to impinge on the filter membrane. The second pipe 6 is further provided with a fourth one-way valve 59, the fourth one-way valve 59 being arranged between the fourth valve 54 and the waste pipe 13, the fourth one-way valve 59 being configured to allow liquid to flow towards the waste pipe 13, so as to prevent water in the waste pipe 13 from flowing towards the first outlet pipe 12.

The first water outlet pipe 12 is also provided with a switch valve 121, and the switch valve 121 is arranged between the second pipe 6 and the first filter 1 to control the on-off of the first water outlet pipe 12.

The working process of the water purifying device provided by the invention is as follows:

first, the fifth valve 55 is opened, and the cleaning tank 4 adds a scale remover to the water purifying apparatus. After a period of time, the first valve 51 is opened and the second valve 52 and the third valve 53 are closed, the circulation line is opened and the clean water line is closed, the booster pump 111 is started, and the water containing the detergent can circulate in the circulation line, so that the detergent is fully contacted with the scale on the filtering membrane. Subsequently, when the first valve 51 is closed and the second valve 52 and the third valve 53 are opened, and the fourth valve 54 is opened, the circulation line is closed and the clean water line is opened, and the water containing the detergent is mainly discharged from the waste pipe 13, and the other part of the water is filtered by the filter membrane, enters the first water outlet pipe 12 and flows to the waste pipe 13 through the second pipe 6, and is discharged through the waste pipe 13.

As shown in fig. 4, the present invention further provides a control method of a water purifying device, which mainly includes the following steps:

s1, obtaining the filth blockage situation of the filter element in the first filter 1. In the example of the present invention, the clogging condition of the filter element in the first filter 1 can be judged according to the water pressure of the first water inlet pipe 11 and the water output of the first water outlet pipe 12. Under the condition that the water pressure of the first water inlet pipe 11 is unchanged, the lower the water yield of the first water outlet pipe 12 is, the more serious the dirt blocking condition of the filter element is. Of course, the method for judging the clogging condition of the filter element is not limited to the above method, and other methods capable of judging the clogging condition of the filter element are included in the scope of the present invention.

S2, controlling the water purifying device to clean according to the filth blockage degree of the filter element in the first filter 1, wherein the water purifying device specifically comprises: if the filter element in the first filter 1 is dirty and blocked, the water purifying device is controlled to clean the filter element of the first filter 1; if the filter element of the first filter 1 is not blocked, the water purifying device is controlled to normally perform water purifying operation without cleaning.

Wherein, "controlling the water purifying apparatus to perform cleaning" includes: the cleaning tank 4 injects a scale remover into the water purifying device; the circulating pipeline is opened, the water purifying pipeline is closed, so that the water containing the descaling agent circulates in the circulating pipeline, and the descaling agent is fully contacted with the scale on the filtering membrane in the first filter 1, so that the descaling effect is improved; the water purifying pipeline is opened, and the circulating pipeline is closed so that the water containing the descaling agent is discharged out of the water purifying device.

As shown in fig. 5, the control method of the water purifying device provided by the invention specifically comprises the following steps:

s1, judging whether the filter element in the first filter 1 is dirty or not. In the example of the present invention, the clogging condition of the filter element in the first filter 1 is judged according to the water pressure of the first water inlet pipe 11 and the water output of the first water outlet pipe 12. Under the condition that the water pressure of the first water inlet pipe 11 is unchanged, if the water yield of the first water outlet pipe 12 is not lower than the preset water yield, the filter element in the first filter 1 is not blocked, and the step S2 is executed; if the water output of the first water outlet pipe 12 is lower than the preset water output, the filter element in the first filter 1 is dirty and blocked, and step S3 is executed.

S2, the first, fourth and fifth valves 51, 54 and 55 are closed and the second and third valves 52 and 53 are opened. The first, fourth and fifth valves 51, 54 and 55 are closed and the second and third valves 52 and 53 are opened, the circulation line is closed and the purified water line is opened, raw water flowing out from the second water outlet pipe 22 of the second filter 2 can flow into the first filter 1 from the first water inlet pipe 11, after being filtered by the filter element in the first filter 1, a part of raw water forms pure water and flows out from the first water outlet pipe 12, and the impurity concentration in the other part of raw water is raised to form concentrated water and flows out from the waste water pipe 13.

S3, the fifth valve 55 is closed after being opened for a first preset time, and step S4 is executed. After the fifth valve 55 is opened, the detergent in the wash tank 4 can be injected into the water purifying apparatus. The first preset time is specifically 2S.

S4, the second valve 52 and the third valve 53 are closed and the first valve 51 is opened, the booster pump 111 is opened for a second preset time, and then step S5 is performed. The second valve 52 and the third valve 53 are closed and the first valve 51 is opened, the circulation line is opened and the clean water line is closed, the booster pump 111 is opened, and the water containing the detergent circulates in the circulation line, so that the detergent is fully contacted with the scale on the filtering membrane of the first filter 1, thereby improving the scale removal effect. The second preset time is specifically 30S.

S5, the first valve 51, the second valve 52 and the third valve 53 are opened, and then step S6 is performed. After the first, second and third valves 51, 52 and 53 are opened, raw water flowing out from the second water outlet pipe 22 of the second filter 2 can flow into the first pipe 3 from the first water inlet pipe 11 and finally into the waste pipe 13, and waste water in the first pipe 3 is discharged into the waste pipe 13.

S6, the first valve 51 is closed and the second valve 52, the third valve 53 and the fourth valve 54 are opened, after which step S7 is performed. The first valve 51 is closed and the second and third valves 52 and 53 are opened, raw water flowing out of the second water outlet pipe 22 of the second filter 2 can flow into the first filter 1 from the first water inlet pipe 11, a part of waste water containing a detergent is discharged from the waste pipe 13, and the other part is filtered by the filtering membrane and then enters the first water outlet pipe 12, and then is discharged into the waste pipe 13 through the second pipe 6.

S7, acquiring the water quality in the first water outlet pipe 12.

S8, judging whether the water quality in the first water outlet pipe 12 meets the standard, if the water quality in the first water outlet pipe 12 meets the standard, indicating that the wastewater in the first water outlet pipe 12 is completely discharged, and executing the step S9; if the water quality in the first water outlet pipe 12 does not meet the standard, it is indicated that the wastewater in the first water outlet pipe 12 is not completely discharged, and step S10 is performed.

And S9, closing the fourth valve 54. After the fourth valve 54 is closed, the first water outlet pipe 12 is disconnected from the waste pipe 13, and pure water in the first water outlet pipe 12 can be normally supplied.

S10, the fourth valve 54 remains open, and step S8 is re-performed after a period of time.

Thus far, the technical solution of the present invention has been described in connection with the preferred embodiments shown in the drawings, but it is easily understood by those skilled in the art that the scope of protection of the present invention is not limited to these specific embodiments. Equivalent modifications and substitutions for related technical features may be made by those skilled in the art without departing from the principles of the present invention, and such modifications and substitutions will fall within the scope of the present invention.

Claims (10)

1. A water purification device comprising a first filter (1), the first filter (1) being capable of purifying water; the water purification device is characterized in that the water purification device is connected with a cleaning tank (4), and the cleaning tank (4) is filled with a scale remover which can be injected into the water purification device and can remove scale in the first filter (1).

2. The water purification device according to claim 1, wherein the first filter (1) is connected with a first water inlet pipe (11) and a waste pipe (13), a first pipe (3) is connected between the first water inlet pipe (11) and the waste pipe (13), and a booster pump (111) is arranged on the first water inlet pipe (11), the waste pipe (13) or the first pipe (3);

-the first pipe (3), part of the first inlet pipe (11), the first filter (1) and part of the waste pipe (13) can form a circulation line, the purge tank (4) being connected to the circulation line or the first inlet pipe (11), the booster pump (111) being connected to the circulation line;

the first water inlet pipe (11), the first filter (1) and the waste pipe (13) can form a purified water pipeline.

3. A water purification apparatus according to claim 2, wherein the first pipe (3) is provided with a first valve (51) to control the on-off of the first pipe (3), the first water inlet pipe (11) is provided with a second valve (52) to control the on-off of the first water inlet pipe (11), and the waste pipe (13) is provided with a third valve (53) to control the on-off of the waste pipe (13);

the connection of the first pipe (3) and the first water inlet pipe (11) is positioned between the second valve (52) and the first filter (1), and the connection of the first pipe (3) and the wastewater pipe (13) is positioned between the third valve (53) and the first filter (1);

the first valve (51), the second valve (52) and the third valve (53) are configured to: -said first valve (51) is open and said second valve (52) and said third valve (53) are closed, said circulation line is open and the clean water line is closed; the first valve (51) is closed and the second valve (52) and the third valve (53) are open, the clean water line is open and the circulation line is closed.

4. The water purification device according to claim 2, wherein the first filter (1) is further connected with a first water outlet pipe (12), a second pipe (6) is connected between the first water outlet pipe (12) and the waste pipe (13), and a fourth valve (54) is arranged on the second pipe (6) to control the on-off of the second pipe (6);

the fourth valve (54) is configured to: -the fourth valve (54) is opened, the first outlet pipe (12) communicating with the waste pipe (13) so that water flowing through the first outlet pipe (12) is discharged into the waste pipe (13); the fourth valve (54) is closed, and the first water outlet pipe (12) and the waste pipe (13) are isolated from each other.

5. The water purification device according to claim 4, wherein the first water outlet pipe (12) is provided with a switch valve (121) to control on-off of the first water outlet pipe (12), and the switch valve (121) is provided between the second pipe (6) and the first filter (1); and/or the number of the groups of groups,

the first water outlet pipe (12) is provided with a third one-way valve (58), and the third one-way valve (58) is configured to enable operating liquid to flow out of the first water outlet pipe (12).

6. The water purification apparatus according to claim 4, wherein a fourth one-way valve (59) is further provided on the second pipe (6), the fourth one-way valve (59) being configured to allow liquid to flow to the waste pipe (13).

7. A water purification apparatus according to claim 2, wherein the outlet of the washing tank (4) is provided with a fifth valve (55) to control the on-off of the outlet of the washing tank (4); and/or the number of the groups of groups,

-the outlet of the washing tank (4) is provided with a first non-return valve (56), the first non-return valve (56) being configured to allow liquid to flow out of the washing tank (4); and/or the number of the groups of groups,

-the first inlet pipe (11) is provided with a second non-return valve (57), the second non-return valve (57) being configured to allow liquid to flow towards the first filter (1); and/or the number of the groups of groups,

the waste pipe (13) is further provided with a waste water valve (131), and the waste water valve (131) can control the flow of the waste pipe (13).

8. A control method of the water purifying apparatus according to claim 2 to 7, wherein the control method includes:

obtaining the filth blockage situation of a filter element in the first filter (1);

and controlling the water purifying device to clean according to the filth blockage degree of the filter element in the first filter (1).

9. The control method of a water purifying apparatus according to claim 8, wherein "controlling the water purifying apparatus to be cleaned according to the clogging degree of the filter element in the first filter (1)" includes:

if the filter element in the first filter (1) is dirty, controlling the water purifying device to clean; and/or the number of the groups of groups,

and if the filter element of the first filter (1) is not blocked, controlling the water purifying device not to clean.

10. The control method of a water purifying apparatus according to claim 8, wherein "controlling the water purifying apparatus to perform washing" includes:

the cleaning tank (4) is used for injecting the descaling agent into the water purifying device;

opening the circulation pipeline and closing the water purification pipeline to circulate the water containing the descaling agent in the circulation pipeline;

and opening the water purifying pipeline and closing the circulating pipeline to enable the water containing the descaling agent to be discharged out of the water purifying device.