CN116078037A - Flushing control method of water purifying equipment and water purifying equipment - Google Patents

Abstract

The invention belongs to the technical field of water purification, and in particular relates to a flushing control method of water purification equipment and the water purification equipment. In the present invention, the water purification equipment includes: a pure water filter element and a post filter element arranged downstream of the pure water filter element, the water outlet of the pure water filter element is connected to the water inlet of the post filter element through a pure water branch, and the flushing control method includes the following steps : Start the flushing mode; in the flushing mode, close the pure water branch, control the raw water to enter the water inlet of the pure water filter element to flush the pure water filter element. In the present invention, when flushing the pure water filter element, the pure water branch between the pure water filter element and the rear filter element can be shut off, so as to prevent the flushing water of the pure water filter element from carrying the protection liquid into the rear filter element. In this way, the technical problem of abnormal oxygen consumption of the whole machine caused by the protection liquid being absorbed into the rear filter element during flushing is solved, ensuring the water quality safety of the effluent of the water purification equipment, and improving the user experience.

Description

Flushing control method of water purification equipment and water purification equipment

technical field

The invention belongs to the technical field of water purification, and in particular relates to a flushing control method of water purification equipment and the water purification equipment.

Background technique

Water purification equipment can effectively remove a variety of pollutants in tap water. The filter element of the water purification equipment contains protective fluid and other components, especially the pure water filter element such as the reverse osmosis membrane filter element contains more protective fluid, so it needs to be rinsed after the water purification equipment is installed to ensure that the water quality of the water purification equipment is qualified . However, at present, when the machine is installed and flushed, the protection liquid will enter the rear filter element and be absorbed by its activated carbon and other materials. The absorbed protection liquid will be desorbed after soaking, resulting in abnormal oxygen consumption of the whole machine and causing health and safety problems. In addition, the flushing process and flushing operation of the existing water purification equipment are very complicated, and users need to turn on and off the faucet several times to perform flushing operations, resulting in low flushing efficiency of the water purification equipment and easy user complaints.

Contents of the invention

The invention provides a flushing control method of water purification equipment and water purification equipment, which are used to solve the technical problem that the protection liquid enters the rear filter element and is adsorbed during flushing, resulting in abnormal oxygen consumption of the whole machine.

The first aspect of the present invention provides a flushing control method for water purification equipment, the water purification equipment includes: a pure water filter element and a rear filter element arranged downstream of the pure water filter element, the water outlet of the pure water filter element passes through The pure water branch is connected to the water inlet of the post filter element,

The flushing control method comprises the following steps:

Start flushing mode;

In the flushing mode, the pure water branch is shut off, and raw water is controlled to enter the water inlet of the pure water filter element to flush the pure water filter element.

In one embodiment, also include:

In the flushing mode, after the flushing of the pure water filter element is completed, the pure water branch is turned on, the water outlet mechanism connected to the water outlet of the rear filter element is opened, and the raw water is controlled to enter through the pure water filter element. The water inlet of the filter element is used to flush the post filter element.

In one embodiment, the water outlet of the pure water filter element is connected to the water inlet of the pure water filter element through a return branch,

In the flushing mode, the pure water branch is turned off, and the pure water filter is flushed in different modes by controlling the turning off and on of the return branch to control the raw water entering the water inlet of the pure water filter.

In one embodiment, by controlling the shutoff and conduction of the return branch to control the raw water entering the water inlet of the pure water filter element, performing different modes of flushing the pure water filter element includes:

Flushing in the first mode: disconnecting the return branch, controlling raw water to enter the water inlet of the pure water filter element, so as to flush the pure water filter element;

Flushing in the second mode: turning on the return branch, controlling raw water to enter the water inlet of the pure water filter element, so as to flush the pure water filter element; and

The third mode flushing: static soaking of the pure water filter element;

Wherein, the flushing in the first mode, the flushing in the second mode and the flushing in the third mode are operated according to a preset flushing control logic to flush the pure water filter element.

In one embodiment, running the flushing in the first mode, the flushing in the second mode and the flushing in the third mode according to the preset flushing control logic to flush the pure water filter element includes the following steps:

Step 11: Rinse the pure water filter element in the first mode for the first preset duration;

Step 12: Alternately perform flushing in the second mode for the second preset duration and flushing in the first mode for the third preset duration on the pure water filter element until the number of times of flushing in the second mode and flushing in the first mode reaches the preset first mode. a number of alternations;

Step 13: Rinse the pure water filter element in the third mode for the fourth preset duration;

Step 14: cyclically run step 11 to step 13 until the number of cycles from step 11 to step 13 reaches the preset first number of cycles;

Step 15: Alternately perform flushing in the second mode for the second preset duration and flushing in the first mode for the third preset duration on the pure water filter element until the number of times of flushing in the second mode and flushing in the first mode reaches the preset second number of alternations.

In one embodiment, running the flushing in the first mode, the flushing in the second mode and the flushing in the third mode according to the preset flushing control logic to flush the pure water filter element includes the following steps:

Step 101: flushing the pure water filter element in the first mode for a first preset duration;

Step 102: Alternately perform flushing in the second mode for the second preset duration and flushing in the first mode for the third preset duration on the pure water filter element, until the number of times of flushing in the second mode and flushing in the first mode reaches the preset first mode. a number of alternations;

Step 103: flushing the pure water filter element in a third mode with a fourth preset duration;

Step 104: cyclically run steps 101 to 103 until the number of cycles from step 101 to step 103 reaches the preset first number of cycles;

Step 105: Rinse the pure water filter element in the first mode for a fifth preset duration;

Step 106: Alternately perform flushing in the second mode of the sixth preset duration and flushing in the first mode of the seventh preset duration on the pure water filter element until the number of alternate times of flushing in the second mode and flushing in the first mode reaches the preset second Two alternate times;

Step 107: Rinse the pure water filter element in the third mode with an eighth preset duration;

Step 108: cyclically run steps 105 to 107 until the number of cycles from step 105 to step 107 reaches the preset second number of cycles;

Step 109: Alternately perform flushing in the second mode for the sixth preset duration and flushing in the first mode for the seventh preset duration on the pure water filter element until the number of times of flushing in the second mode and flushing in the first mode reaches the preset first mode. Three times of alternation.

In one embodiment, the water purification device starts the flushing mode when it is powered on for the first time; or, the water purification device starts the flushing mode according to a reset command.

The second aspect of the present invention provides a water purification device, which is controlled by the flushing control method as described above, including: a pure water filter element and a post filter element arranged downstream of the pure water filter element, the outlet of the pure water filter element The water inlet is connected to the water inlet of the rear filter element through a pure water branch, the water inlet of the pure water filter element is connected to the water supply pipeline, the water outlet of the rear filter element is connected to the water outlet mechanism, and the water outlet of the pure water filter element The water outlet is connected with the water inlet of the pure water filter element through a return branch.

In one embodiment, comprising: a three-way valve,

The three-way valve has a valve inlet, a first valve outlet and a second valve outlet, the valve water inlet is connected to the water outlet of the pure water filter element, the first valve outlet is connected to the pure water branch, The outlet of the second valve is connected to the water inlet of the pure water filter element through a return branch;

Wherein, the shut-off and conduction of the pure water branch and the return branch are controlled by the three-way valve.

In one embodiment, it includes: a pump body and a water inlet valve,

The water inlet of the water inlet valve is connected to the water supply pipeline, the water outlet of the water inlet valve is connected to the water inlet of the pump body, the water outlet of the pump body is connected to the water inlet of the pure water filter element, and the water outlet of the pump body is connected to the water inlet of the pure water filter element. The corresponding ends of the return branch are connected between the water outlet of the water inlet valve and the water inlet of the pump body.

Compared with the prior art, the present invention has the advantages that: in the present invention, when flushing the pure water filter element, the pure water branch between the pure water filter element and the rear filter element can be cut off, so that the flushing of the pure water filter element can be avoided. The water will not carry the protection liquid into the rear filter element, so as to solve the technical problem of abnormal oxygen consumption of the whole machine caused by the protection liquid entering the rear filter element when flushing, ensuring the safety of the water quality of the water purification equipment, and improving the use of users experience.

Description of drawings

Hereinafter, the present invention will be described in more detail based on the embodiments with reference to the accompanying drawings.

Fig. 1 is the flow chart of the flushing control method of the water purifying equipment in one embodiment of the present invention;

Fig. 2 is the structural representation of the water purifying equipment in an embodiment of the present invention;

Fig. 3 is the structural representation of the three-way valve in an embodiment of the present invention;

Fig. 4 is a schematic diagram of the internal structure of a three-way valve in one embodiment of the present invention;

Figure 5 is a second schematic diagram of the internal structure of the three-way valve in an embodiment of the present invention;

Fig. 6 is a schematic structural diagram of a water purification device in another embodiment of the present invention.

Reference signs:

1. Pure water filter element; 2. Rear filter element; 3. Front filter element; 4. Water outlet mechanism;

5. Pure water branch; 6. Backflow branch; 7. Three-way valve; 8. Water inlet valve;

9. Pump body; 10. Check valve; 11. Waste water valve;

12. Pure water valve; 13. Return valve;

71. Valve inlet; 72. First valve outlet; 73. Second valve outlet.

Detailed ways

The present invention will be further described below in conjunction with accompanying drawing. It should be noted that, as long as there is no conflict, each embodiment and each feature in each embodiment of the present invention can be combined with each other, and the formed technical solutions are all within the protection scope of the present invention.

A first aspect of the present invention provides a flushing control method for water purification equipment.

The water purification equipment includes a pure water filter element 1 and a post filter element 2 arranged downstream of the pure water filter element 1 , the water outlet of the pure water filter element 1 is connected to the water inlet of the post filter element 2 through a pure water branch 5 .

As shown in Fig. 1, flushing control method of the present invention comprises the following steps:

Step 0: Start flushing mode.

Step 1: In the flushing mode, turn off the pure water branch 5, and control the raw water to enter the water inlet of the pure water filter element 1 to flush the pure water filter element 1.

In the present invention, when the pure water filter element 1 is flushed, the pure water branch 5 between the pure water filter element 1 and the rear filter element 2 is shut off, so that the flushing water of the pure water filter element 1 will not flush with the protection liquid after entering. Put it in the filter element 2, so as to avoid the abnormal oxygen consumption of the whole machine caused by the absorption of the protection liquid by the rear filter element 2, ensure the water quality safety of the water outlet of the water purification equipment, and improve the user experience.

In step 1, raw water enters the water inlet of the pure water filter element 1 to rinse the pure water filter element 1, and the flushing water produced is discharged from the waste water outlet of the pure water filter element 1. That is, the pure water filter element 1 has a water inlet, a water outlet and a waste water outlet.

In addition, the flushing process and flushing operation of the flushing control method of the present invention are simple, can improve the flushing efficiency of the water purification equipment, and do not require the user to frequently turn on or off the faucet for manual flushing, which can effectively improve user experience.

In step 0, the water purification device starts the flushing mode when it is powered on for the first time. That is, the water purification equipment should be flushed after installation.

Alternatively, the water purification device starts the flushing mode according to the reset command. For example, the user flushes the water purification equipment after replacing a new filter element. Wherein, the user can send a reset command by pressing the reset key on the water purification device.

The flushing control method of the present invention also includes: step 2: in the flushing mode, after flushing the pure water filter element 1, turn on the pure water branch 5, and open the water outlet mechanism 4 connected to the water outlet of the rear filter element 2 , control the raw water to pass through the pure water filter element 1 and enter the water inlet of the rear filter element 2 to flush the rear filter element 2.

In step 2, after the flushing of the pure water filter element 1 is completed, the rear filter element 2 is then flushed, thereby preventing the protection liquid of the pure water filter element 1 from entering the rear filter element 2 during flushing, and at the same time, the raw water passes through the pure water filter element 1 After filtering, the rear filter element 2 is flushed, which improves the flushing effect.

Preferably, after the flushing of the post-filter element 2 is completed, the filter element light flashes to end in the lifting flushing mode, and the flushing of the water purification equipment is completed. Or, in the flushing mode, the filter light flashes to indicate that the water purification device is being flushed.

In one embodiment, the water outlet of the pure water filter element 1 is connected to the water inlet of the pure water filter element 1 through a return branch 6 . In the flushing mode, the pure water branch 5 is turned off, and the pure water filter 1 is flushed in different modes by controlling the turning off and on of the return branch 6 to control the raw water entering the water inlet of the pure water filter 1 .

Wherein, by setting the return branch 6 and controlling the closing and conducting of the return branch 6, automatic flushing of the pure water filter element 1 in different modes can be realized. When the backflow branch 6 is turned on, the pure water flowing out of the water outlet of the pure water filter element 1 mixes with the raw water and then enters the water inlet of the pure water filter element 1, which improves the water quality and is beneficial to improve the flushing effect.

Specifically, by controlling the shut-off and conduction of the return branch 6, to control the raw water entering the water inlet of the pure water filter 1, the different modes of flushing the pure water filter 1 include: first mode flushing: disconnect the return branch 6 , to control the raw water entering the water inlet of the pure water filter element 1, so as to flush the pure water filter element 1; the second mode of flushing: turn on the backflow branch 6, and control the raw water to enter the water inlet of the pure water filter element 1, so as to flush the pure water filter element 1 Rinsing; and the third mode of rinsing: statically soaking the pure water filter element 1 .

Wherein, the first mode of flushing, the second mode of flushing and the third mode of flushing are operated according to the preset flushing control logic to flush the pure water filter element 1 .

The flushing sequence of the above three modes can be arranged and combined arbitrarily, and can be specifically determined according to the type and quantity of the pure water filter element 1 .

When flushing the pure water filter element 1 in the first mode, when the return branch 6 is turned off, the raw water enters the water inlet of the pure water filter element 1 to flush the pure water filter element 1, and the rinsed water flows from the pure water filter element 1 The waste water is discharged from the outlet to realize the flushing of the filter membrane surface of the pure water filter element 1, that is, positive flushing and concentrated flushing.

When flushing the pure water filter element 1 in the second mode, when the return water branch is turned on, the raw water flows into the raw water side of the pure water filter element 1 from the water inlet of the pure water filter element 1, and then passes through the filter membrane of the pure water filter element 1 Pure water is produced on the water production side of the pure water filter element 1, and the pure water flows back to the raw water side through the return branch 6 and mixes with the raw water to flush the pure water filter element 1, so as to realize the membrane filtration of the pure water filter element 1. Deep flushing of the hole, that is, pure water backwashing. At the same time, when flushing in the second mode, the water quality is improved, thereby enhancing the flushing effect.

When flushing the pure water filter element 1 in the third mode, the inner cavity of the pure water filter element 1 is filled with water, and the water supply is stopped, so that the pure water filter element 1 is soaked statically, wherein the static soaking can effectively promote Components such as protection solution are separated out.

In addition, the water flow rate of the positive flushing and draining flushing is greater than the water flow rate of the pure water backwashing.

Embodiment one

In this embodiment, running the first mode flushing, the second mode flushing and the third mode flushing according to the preset flushing control logic to flush the pure water filter element 1 includes the following steps:

Step 11: flushing the pure water filter element 1 in the first mode for the first preset duration;

Step 12: Alternately perform flushing in the second mode for the second preset duration and flushing in the first mode for the third preset duration on the pure water filter element 1 until the number of alternate times between flushing in the second mode and flushing in the first mode reaches the preset the first number of alternations;

Step 13: flushing the pure water filter element 1 in the third mode for a fourth preset duration;

Step 14: cyclically run step 11 to step 13 until the number of cycles from step 11 to step 13 reaches the preset first number of cycles;

Step 15: Alternately perform flushing in the second mode for the second preset duration and flushing in the first mode for the third preset duration on the pure water filter element 1 until the number of times of flushing in the second mode and flushing in the first mode reaches the preset second Two alternate times.

In this embodiment, the pure water filter element 1 is first flushed in the first mode, that is, the positive flushing and concentrated washing, so as to quickly discharge the protective liquid on the filter membrane surface of the pure water filter element 1; then alternately perform the second mode flushing and the first mode flushing, to remove the protective liquid on the surface of the filter membrane of the pure water filter element 1 and the membrane pores; Then run the above-mentioned flushing operation in a cycle to fully remove the protection solution. Finally, the second mode of flushing and the first mode of flushing are alternately performed to remove components such as the protective solution precipitated by static immersion.

Wherein, the above-mentioned duration and times are set and changed according to actual needs. Preferably, the first preset duration can be set to 1-10min, the second preset duration can be set to 1-60min, the third preset duration can be set to 1-10min, and the fourth preset duration can be set to 1-10h , the first number of alternations can be set to 1-50 times, the first cycle number can be set to 1-50 times, and the second number of alternations can be set to 1-50 times.

Embodiment two

In this embodiment, running the first mode flushing, the second mode flushing and the third mode flushing according to the preset flushing control logic to flush the pure water filter element 1 includes the following steps:

Step 101: flushing the pure water filter element 1 in the first mode for a first preset duration;

Step 102: Alternately perform flushing in the second mode for the second preset duration and flushing in the first mode for the third preset duration c on the pure water filter element 1 until the number of times of flushing in the second mode and flushing in the first mode reaches the preset The first number of alternations;

Step 103: flushing the pure water filter element 1 in the third mode for a fourth preset duration;

Step 104: cyclically run steps 101 to 103 until the number of cycles from step 101 to step 103 reaches the preset first number of cycles;

Step 105: Rinse the pure water filter element 1 in the first mode for a fifth preset duration;

Step 106: Alternately perform flushing in the second mode of the sixth preset duration and flushing in the first mode of the seventh preset duration on the pure water filter element 1 until the number of times of flushing in the second mode and flushing in the first mode reaches the preset the second number of alternations;

Step 107: Rinse the pure water filter element 1 in the third mode with an eighth preset duration;

Step 108: cyclically run steps 105 to 107 until the number of cycles from step 105 to step 107 reaches the preset second number of cycles;

Step 109: Alternately perform flushing in the second mode of the sixth preset duration and flushing in the first mode of the seventh preset duration on the pure water filter element 1 until the number of times of flushing in the second mode and flushing in the first mode reaches the preset The third number of alternations.

In this embodiment, steps 101 to 104 are the first stage of flushing, and steps 105 to 109 are the second stage of flushing, wherein two stages of flushing are used to improve the flushing effect.

Wherein, compared with the first-stage flushing, the flushing duration of the second-mode flushing and the first-mode flushing can be set to be shorter, and the number of flushing times can also be set to fewer times. That is, the sixth preset duration is shorter than the second preset duration, and the seventh preset duration is shorter than the third preset duration. And/or, the second number of alternations is smaller than the first number of alternations.

It should be noted that the above duration and times are set and changed according to actual needs. Different flushing durations and flushing times can produce different flushing effects.

Preferably, in this embodiment, the first preset duration can be set to 1-10min, the second preset duration can be set to 1-60min, the third preset duration can be set to 1-10min, and the fourth preset duration can be set to Set to 1-10h, the fifth preset duration can be set to 1-10min, the sixth preset duration can be set to 1-60min, the seventh preset duration can be set to 1-10min, the eighth preset duration can be set to 1-10h, the first alternating times can be set to 1-50 times, the second alternating times can be set to 1-50 times, the third alternating times can be set to 1-50 times, the first cycle times can be set to 1-50 times times, the second cycle times can be set to 1-50 times.

As shown in FIG. 2 , the second aspect of the present invention provides a water purification device, which is controlled by the flushing control method above. The water purification equipment includes: a pure water filter element 1 and a post filter element 2 arranged downstream of the pure water filter element 1. The water outlet of the pure water filter element 1 is connected to the water inlet of the post filter element 2 through a pure water branch 5. The water inlet is connected with the water supply pipeline, the water outlet of the rear filter element 2 is connected with the water outlet mechanism 4, and the water outlet of the pure water filter element 1 is connected with the water inlet of the pure water filter element 1 through the return branch 6.

Wherein, the water outlet mechanism 4 includes a faucet, such as an electric control faucet or a mechanical faucet.

In one embodiment, the water purification equipment includes: a three-way valve 7 . As shown in Figure 3, the three-way valve 7 has a valve inlet 71, a first valve outlet 72 and a second valve outlet 73, the valve water inlet is connected to the water outlet of the pure water filter element 1, the first valve outlet 72 is connected to the pure water branch The outlet 73 of the second valve is connected with the water inlet of the pure water filter element 1 through the return branch 6 . Wherein, the shut-off and conduction of the pure water branch 5 and the return branch 6 are controlled by the three-way valve 7 .

In this embodiment, the water outlet of the pure water filter element 1 can be respectively connected to the pure water branch 5 and the return flow branch 6 through the three-way valve 7, and the structure is simple.

Specifically, as shown in FIGS. 4-5 , the three-way valve 7 has a spool, and the on-off control of the valve inlet 71 and the first valve outlet 72 and the second valve outlet 73 can be realized by adjusting the position of the spool.

As shown in FIG. 4 , the first valve outlet 72 is connected to the valve inlet 71 , and the second valve outlet 73 is disconnected from the valve inlet 71 , so that the pure water branch 5 is connected and the return branch 6 is closed. As shown in FIG. 5 , the first valve outlet 72 is disconnected from the valve inlet 71 , and the second valve outlet 73 is connected to the valve inlet 71 , so that the pure water branch 5 is closed and the return branch 6 is turned on.

In another embodiment, as shown in FIG. 6 , the water purification equipment includes: a pure water valve 12 and a return valve 13, and the pure water valve 12 is arranged on the pure water branch 5 to control the opening and closing of the pure water branch 5. The return valve 13 is set on the return branch 6 to control the turn-off and conduction of the return branch 6 .

Specifically, the water purification equipment includes: a pump body 9 and a water inlet valve 8 . The water inlet of the water inlet valve 8 is connected with the water supply pipeline, the water outlet of the water inlet valve 8 is connected with the water inlet of the pump body 9, the water outlet of the pump body 9 is connected with the water inlet of the pure water filter element 1, and the return flow branch 6 The corresponding ends are connected between the water outlet of the water inlet valve 8 and the water inlet of the pump body 9 .

Wherein, the water inlet valve 8 is used for controlling the water inlet, and the pump body 9 is used for boosting and stabilizing the pressure.

In one embodiment, the water purification device further includes a pre-filter 3 arranged upstream of the pure water filter 1 . The water outlet of the pre-filter element 3 is connected with the water inlet of the water inlet valve 8 .

Wherein, the pre-filter 3 can perform preliminary filtration on the raw water flowing into its water inlet, and the pre-filtered raw water flows out from its water outlet to flow into the pure water filter 1 . The rear filter element 2 further filters the pure water flowing into its water inlet, and the further filtered pure water flows out from the water outlet mechanism 4 (faucet) for use by users.

The pre-filter element 3 can be one or a combination of PP or origami PP, activated carbon/carbon fiber, carbon rod, ultrafiltration, and microfiltration. The pure water filter element 1 is a composite of one or more of ultrafiltration, microfiltration, nanofiltration and reverse osmosis. The rear filter element 2 is activated carbon, a carbon rod, an adsorption filter element or a filter element compounded with an adsorption filter element, etc. In addition, the number of the above-mentioned pre-filter element 3 , pure water filter element 1 and post-filter element 2 can be set to one or more.

It can be understood that since the pre-filter element 3 is arranged upstream of the pure water filter element 1, when the pure water filter element 1 is flushed, its protective liquid is not easy to enter the pre-filter element 3, therefore, the present invention mainly focuses on pure water The filter element 1 and its downstream post-filter element 2 are flushed.

Further, both the first branch and the return branch 6 are provided with a check valve 10 for controlling the flow of water. A water valve is arranged at the waste water outlet of the pure water filter element 1 to control the outflow of waste water.

Specifically, the above-mentioned three-way valve 7, water inlet valve 8 and waste water valve 11 are all electromagnetic valves.

The water purification equipment also includes a controller, which is used to realize the treatment and control functions. Specifically, the controller is used to shut off the pure water branch 5 in the flushing mode, and control the raw water to enter the water inlet of the pure water filter element 1 to flush the pure water filter element 1 .

In the description of the present invention, it should be noted that unless otherwise specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection. Connected, or integrally connected; may be mechanically connected; may be directly connected, or indirectly connected through an intermediary, and may be internal communication of two elements. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present invention in specific situations.

While the invention has been described with reference to a preferred embodiment, various modifications may be made and equivalents may be substituted for parts thereof without departing from the scope of the invention. In particular, as long as there is no structural conflict, the technical features mentioned in the various embodiments can be combined in any manner. The present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims (10)

1. A flushing control method for water purification equipment, characterized in that the water purification equipment comprises: a pure water filter element and a post filter element arranged downstream of the pure water filter element, the water outlet of the pure water filter element passes through the pure water filter element The water branch is connected to the water inlet of the post filter element, The flushing control method comprises the following steps: Start flushing mode; In the flushing mode, the pure water branch is shut off, and raw water is controlled to enter the water inlet of the pure water filter element to flush the pure water filter element. 2. The flushing control method according to claim 1, further comprising: In the flushing mode, after the flushing of the pure water filter element is completed, the pure water branch is turned on, the water outlet mechanism connected to the water outlet of the rear filter element is opened, and the raw water is controlled to enter through the pure water filter element. The water inlet of the filter element is used to flush the post filter element. 3. The flushing control method according to claim 1 or 2, characterized in that, the water outlet of the pure water filter element is connected to the water inlet of the pure water filter element through a backflow branch, In the flushing mode, the pure water branch is turned off, and by controlling the turning off and on of the return branch, the raw water enters the water inlet of the pure water filter element to perform different modes of cleaning on the pure water filter element. rinse. 4. The flushing control method according to claim 3, characterized in that, by controlling the shut-off and conduction of the return branch, the raw water is controlled to enter the water inlet of the pure water filter element to perform cleaning on the pure water filter element. The different modes of flushing include: Flushing in the first mode: disconnecting the return branch, controlling raw water to enter the water inlet of the pure water filter element, so as to flush the pure water filter element; Flushing in the second mode: turning on the return branch, controlling raw water to enter the water inlet of the pure water filter element, so as to flush the pure water filter element; and The third mode flushing: static soaking of the pure water filter element; Wherein, the flushing in the first mode, the flushing in the second mode and the flushing in the third mode are operated according to a preset flushing control logic to flush the pure water filter element. 5. The flushing control method according to claim 4, characterized in that, the flushing in the first mode, the flushing in the second mode and the flushing in the third mode are run according to the preset flushing control logic, so that the pure water Flushing the filter element involves the following steps: Step 11: Rinse the pure water filter element in the first mode for the first preset duration; Step 12: Alternately perform flushing in the second mode for the second preset duration and flushing in the first mode for the third preset duration on the pure water filter element until the number of times of flushing in the second mode and flushing in the first mode reaches the preset first mode. a number of alternations; Step 13: Rinse the pure water filter element in the third mode for the fourth preset duration; Step 14: cyclically run step 11 to step 13 until the number of cycles from step 11 to step 13 reaches the preset first number of cycles; Step 15: Alternately perform flushing in the second mode for the second preset duration and flushing in the first mode for the third preset duration on the pure water filter element until the number of times of flushing in the second mode and flushing in the first mode reaches the preset second number of alternations. 6. The flushing control method according to claim 4, characterized in that, the flushing in the first mode, the flushing in the second mode and the flushing in the third mode are run according to the preset flushing control logic, so that the pure water Flushing the filter element involves the following steps: Step 101: flushing the pure water filter element in the first mode for a first preset duration; Step 102: Alternately perform flushing in the second mode for the second preset duration and flushing in the first mode for the third preset duration on the pure water filter element, until the number of times of flushing in the second mode and flushing in the first mode reaches the preset first mode. a number of alternations; Step 103: flushing the pure water filter element in a third mode with a fourth preset duration; Step 104: cyclically run steps 101 to 103 until the number of cycles from step 101 to step 103 reaches the preset first number of cycles; Step 105: Rinse the pure water filter element in the first mode for a fifth preset duration; Step 106: Alternately perform flushing in the second mode of the sixth preset duration and flushing in the first mode of the seventh preset duration on the pure water filter element until the number of alternate times of flushing in the second mode and flushing in the first mode reaches the preset second Two alternate times; Step 107: Rinse the pure water filter element in the third mode with an eighth preset duration; Step 108: cyclically run steps 105 to 107 until the number of cycles from step 105 to step 107 reaches the preset second number of cycles; Step 109: Alternately perform flushing in the second mode for the sixth preset duration and flushing in the first mode for the seventh preset duration on the pure water filter element until the number of times of flushing in the second mode and flushing in the first mode reaches the preset first mode. Three times of alternation. 7. The flushing control method according to claim 1 or 2, characterized in that, the flushing mode is started when the water purification equipment is powered on for the first time; or, The water purification equipment starts the flushing mode according to a reset command. 8. A water purification device, which is controlled by the flushing control method according to any one of claims 1-7, characterized in that it comprises: a pure water filter element and a post filter element arranged downstream of the pure water filter element, The water outlet of the pure water filter element is connected to the water inlet of the rear filter element through a pure water branch, the water inlet of the pure water filter element is connected to the water supply pipeline, and the water outlet of the rear filter element is connected to the water outlet mechanism , the water outlet of the pure water filter element is connected with the water inlet of the pure water filter element through a return branch. 9. The water purification device according to claim 8, characterized in that it comprises: a three-way valve, The three-way valve has a valve inlet, a first valve outlet and a second valve outlet, the valve water inlet is connected to the water outlet of the pure water filter element, the first valve outlet is connected to the pure water branch, The outlet of the second valve is connected to the water inlet of the pure water filter element through a return branch; Wherein, the shut-off and conduction of the pure water branch and the return branch are controlled by the three-way valve. 10. The water purification device according to claim 8 or 9, characterized in that it comprises: a pump body and a water inlet valve, The water inlet of the water inlet valve is connected to the water supply pipeline, the water outlet of the water inlet valve is connected to the water inlet of the pump body, the water outlet of the pump body is connected to the water inlet of the pure water filter element, and the water outlet of the pump body is connected to the water inlet of the pure water filter element. The corresponding ends of the return branch are connected between the water outlet of the water inlet valve and the water inlet of the pump body.

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