Water purification device and reflux control method, device and computer readable storage medium thereof

Abstract

The application relates to a backflow control method and device of a water purification equipment, the water purification equipment, a computer readable storage medium and a computer program product. The method comprises the following steps: acquiring raw water quality parameter detection values and pure water quality parameter detection values; determining a maximum allowable change value of the pure water quality parameter according to the raw water quality parameter detection values; if the pure water quality parameter detection value exceeds the maximum allowable change value, adjusting a backflow control parameter to obtain an updated backflow control parameter; and after water production of the water purification equipment is completed, controlling a pure water backflow branch to be conducted according to the updated backflow control parameter. Wherein, the change amount of the pure water quality is greater than the change amount of the pure water quality in the process of backflow with the backflow control parameter before the update. The method can reduce the TDS concentration of the raw water side of the reverse osmosis device, and control the TDS concentration of the first cup of pure water.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of water purification equipment, in particular to a backflow control method and device of water purification equipment, water purification equipment, a computer readable storage medium and a computer program product. BACKGROUND

[0002] The reverse osmosis membrane water purifier mainly relies on a reverse osmosis device to filter raw water, and outputs filtered pure water for users to drink. When the water purifier produces water, there are raw water and pure water at both ends of the reverse osmosis device during the standby process, and the TDS (Total Dissolved Solids) concentration of the raw water is much higher than that of the pure water. Under the action of osmotic pressure, water salt ions on the raw water side of the reverse osmosis device penetrate to the pure water side, resulting in that the TDS concentration of the first cup of pure water is relatively high when the water purifier is started next time to produce pure water, which affects the health of users.

[0003] At present, in order to reduce the TDS concentration of the first cup of pure water, the pure water backflow method is generally used to reduce the TDS value of the raw water side after the water purifier is stopped for a period of time. The control parameter of the pure water backflow in the water purifier is a fixed value, but the water quality of the raw water is unstable, resulting in that the ion concentration difference between the raw water side and the pure water side of the reverse osmosis device is unstable, which may cause the TDS concentration of the first cup of water produced by the water purifier to be still relatively high, and the improvement effect cannot reach the expectation. SUMMARY

[0004] Therefore, it is necessary to provide a backflow control method and device of water purification equipment, water purification equipment, a computer readable storage medium and a computer program product to solve the problem of high TDS concentration of the first cup of pure water.

[0005] In a first aspect, the present application provides a backflow control method of water purification equipment. The water inlet end of a reverse osmosis device of the water purification equipment is communicated with a raw water branch, and the water outlet end is communicated with a pure water branch. A pure water backflow branch is arranged between the water outlet end and the water inlet end of the reverse osmosis device. When the pure water backflow branch is conducted, the pure water at the water outlet end of the reverse osmosis device backflows to the water inlet end. The backflow control method comprises the following steps:

[0006] obtaining a raw water quality parameter detection value and a pure water quality parameter detection value;

[0007] determining a maximum allowable change value of the pure water quality parameter according to the raw water quality parameter detection value;

[0008] if the pure water quality parameter detection value exceeds the maximum allowable change value, adjusting a backflow control parameter to obtain an updated backflow control parameter;

[0009] After the water purification device finishes producing water, the pure water backflow branch is controlled to be turned on according to the updated backflow control parameter; during the process in which the pure water backflow branch backflows according to the updated backflow control parameter, the change amount of the pure water quality is smaller than that during the process in which the pure water backflow branch backflows according to the backflow control parameter before being updated.

[0010] In one of the embodiments, the determining of the maximum allowable change value of the pure water quality parameter according to the detected value of the raw water quality parameter comprises:

[0011] During the process in which the water purification device produces water, the static standby time length between the time when the water production starts and the time when the last filtration of the reverse osmosis device ends is obtained.

[0012] The maximum allowable change value of the pure water quality parameter is determined according to the detected value of the raw water quality parameter and the static standby time length.

[0013] In one of the embodiments, the method for determining the initial value of the backflow control parameter comprises:

[0014] During the process in which the water purification device produces water for the first time, the detected value of the raw water quality parameter is obtained.

[0015] The initial value of the backflow control parameter is determined according to the relationship between the detected value of the raw water quality parameter and the water quality threshold value.

[0016] In one of the embodiments, the number of the water quality threshold values is at least two, and each of the water quality threshold values forms a water quality parameter threshold value range of multiple gears; the determining of the initial value of the backflow control parameter according to the relationship between the detected value of the raw water quality parameter and the water quality threshold value comprises:

[0017] The initial value of the backflow control parameter is determined according to the water quality parameter threshold value range corresponding to the detected value of the raw water quality parameter.

[0018] In one of the embodiments, after the determining of the maximum allowable change value of the pure water quality parameter according to the detected value of the raw water quality parameter, the method further comprises:

[0019] If the detected value of the pure water quality parameter is lower than the maximum allowable change value, the backflow control parameter is adjusted to obtain an updated backflow control parameter;

[0020] After the water purification device finishes producing water, the pure water backflow branch is controlled to be turned on according to the updated backflow control parameter; during the process in which the pure water backflow branch backflows according to the updated backflow control parameter, the change amount of the pure water quality is smaller than that during the process in which the pure water backflow branch backflows according to the backflow control parameter before being updated.

[0021] In one of the embodiments, the adjusting of the backflow control parameter comprises:

[0022] adjust the backflow control parameter according to the preset parameter variation amount.

[0023] In one of the embodiments, the adjusting the backflow control parameter to obtain an updated backflow control parameter comprises:

[0024] determining a variation amount of the backflow control parameter according to a relationship between the pure water quality parameter detection value and the maximum allowable variation value;

[0025] adjusting the backflow control parameter according to the variation amount of the backflow control parameter.

[0026] In one of the embodiments, the backflow control parameter comprises: a single backflow duration in the pure water backflow mode, a backflow waiting duration between a backflow starting time and a water production ending time of the water purification device, and a maximum standby duration allowed after the pure water backflow ends.

[0027] The adjusting the backflow control parameter comprises: adjusting at least one of the backflow duration, the backflow waiting duration, and the maximum standby duration.

[0028] In a second aspect, the present application further provides a backflow control device of a water purification device. The water purification device comprises a reverse osmosis device, a raw water branch connected to a water inlet end of the reverse osmosis device, and a pure water branch connected to a water outlet end of the reverse osmosis device; a pure water backflow branch is arranged between the water inlet end and the water outlet end of the reverse osmosis device, and when the pure water backflow branch is conducted, pure water at the water outlet end of the reverse osmosis device flows back to the water inlet end; the device comprises:

[0029] a parameter acquisition module configured to acquire a raw water quality parameter detection value and a pure water quality parameter detection value;

[0030] a threshold determination module configured to determine a maximum allowable variation value of the pure water quality parameter according to the raw water quality parameter detection value;

[0031] a parameter adjustment module configured to adjust a backflow control parameter to obtain an updated backflow control parameter if the pure water quality parameter detection value exceeds the maximum allowable variation value;

[0032] a backflow control module configured to control the pure water backflow branch to be conducted according to the updated backflow control parameter after water production of the water purification device ends; and a variation amount of pure water quality in a process in which the pure water backflow branch is conducted according to the updated backflow control parameter is greater than a variation amount of pure water quality in a process in which the pure water backflow branch is conducted according to a backflow control parameter before the update.

[0033] In a third aspect, the present application also provides a water purification device. The water purification device comprises a controller and a reverse osmosis device, wherein the water inlet end of the reverse osmosis device is connected with a raw water branch, the water outlet end of the reverse osmosis device is connected with a pure water branch, a pure water backflow branch is arranged between the water outlet end and the water inlet end of the reverse osmosis device, when the pure water backflow branch is conducted, the pure water at the water outlet end of the reverse osmosis device flows back to the water inlet end; the raw water branch is provided with a raw water parameter detection device connected with the controller, the pure water branch is provided with a pure water parameter detection device connected with the controller, and the pure water backflow branch is provided with a backflow switch connected with the controller.

[0034] The controller is configured to control the pure water backflow branch to be conducted according to the method.

[0035] In a fourth aspect, the present application also provides a computer readable storage medium. The computer readable storage medium stores a computer program, and the computer program is executed by a processor to implement the following steps:

[0036] Obtaining a raw water quality parameter detection value and a pure water quality parameter detection value;

[0037] Determining a maximum allowable change value of the pure water quality parameter according to the raw water quality parameter detection value;

[0038] If the pure water quality parameter detection value exceeds the maximum allowable change value, adjusting a backflow control parameter to obtain an updated backflow control parameter;

[0039] After water production of the water purification device is completed, controlling the pure water backflow branch to be conducted according to the updated backflow control parameter; during the process in which the pure water backflow branch flows back at the updated backflow control parameter, the change amount of the pure water quality is greater than that during the process in which the pure water backflow branch flows back at the backflow control parameter before being updated.

[0040] In a fifth aspect, the present application also provides a computer program product. The computer program product comprises a computer program, and the computer program is executed by a processor to implement the following steps:

[0041] Obtaining a raw water quality parameter detection value and a pure water quality parameter detection value;

[0042] Determining a maximum allowable change value of the pure water quality parameter according to the raw water quality parameter detection value;

[0043] If the pure water quality parameter detection value exceeds the maximum allowable change value, adjusting a backflow control parameter to obtain an updated backflow control parameter;

[0044] After the water making of the water purification device ends, the pure water backflow branch is controlled to be turned on according to the updated backflow control parameter; during the process in which the pure water backflow branch backflows according to the updated backflow control parameter, the change amount of the pure water quality is greater than that during the process in which the pure water backflow branch backflows according to the backflow control parameter before being updated.

[0045] The backflow control method, device, water purification device, computer readable storage medium and computer program product of the water purification device obtain a raw water quality parameter detection value and a pure water quality parameter detection value; determine a maximum allowable change value of the pure water quality parameter according to the raw water quality parameter detection value; if the pure water quality parameter detection value exceeds the maximum allowable change value, adjust the backflow control parameter to obtain an updated backflow control parameter; after the water making of the water purification device ends, control the pure water backflow branch to be turned on according to the updated backflow control parameter. During the process in which the pure water backflow branch backflows according to the updated backflow control parameter, the change amount of the pure water quality is greater than that during the process in which the pure water backflow branch backflows according to the backflow control parameter before being updated. Thus, the backflow control parameter is adjusted adaptively according to the actual values of the raw water quality and the pure water quality, so as to reduce the TDS concentration of the pure water side of the reverse osmosis device and realize the control of the TDS concentration of the first cup of pure water. BRIEF DESCRIPTION OF DRAWINGS

[0046] Figure 1 FIG. 1 is a structural schematic diagram of a water purification device in an embodiment;

[0047] Figure 2 FIG. 2 is a flow schematic diagram of a backflow control method of the water purification device in an embodiment;

[0048] Figure 3 FIG. 3 is a flow schematic diagram of a backflow control method of the water purification device in another embodiment;

[0049] Figure 4 FIG. 4 is a flow schematic diagram of a method for determining an initial value of a backflow control parameter in an embodiment;

[0050] Figure 5 FIG. 5 is a flow schematic diagram of a method for determining a maximum allowable change value of a pure water quality parameter according to a raw water quality parameter detection value in an embodiment;

[0051] Figure 6 FIG. 6 is a structural block diagram of a backflow control device of the water purification device in an embodiment;

[0052] Figure 7 FIG. 7 is a structural block diagram of a backflow control device of the water purification device in another embodiment. DETAILED DESCRIPTION

[0053] In order to make the purpose, technical scheme and advantages of the present application clearer, the present application will be further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and not to limit the present application.

[0054] In one embodiment, a water purification device is provided. As shown in the drawings, the water purification device comprises a controller (not shown) and a reverse osmosis device, the water inlet end of the reverse osmosis device is connected to a raw water branch, the water outlet end of the reverse osmosis device is connected to a pure water branch, a pure water backflow branch is provided between the water outlet end and the water inlet end of the reverse osmosis device, and when the pure water backflow branch is conducted, the pure water at the water outlet end of the reverse osmosis device flows back to the water inlet end. The raw water branch is provided with a raw water parameter detection device (not shown) connected to the controller, the pure water branch is provided with a pure water parameter detection device connected to the controller, and the pure water backflow branch is provided with a backflow switch connected to the controller. Figure 1

[0055] The raw water branch is used to access the raw water to be filtered, the reverse osmosis device can include a reverse osmosis membrane filter element and other filtering components, which are used to filter the raw water accessed by the water inlet end and output to the pure water branch through the water outlet end, and provide to the user from the pure water branch.

[0056] The water purification device further comprises a wastewater branch connected to the wastewater outlet of the reverse osmosis device. The structures of the raw water branch, the pure water branch, the wastewater branch and the pure water backflow branch can be set according to actual conditions in actual implementation. It can be understood that the raw water branch can also be provided with a pressure stabilizing pump and a raw water inlet electromagnetic valve. The pure water branch can also be provided with a pure water outlet. The wastewater branch can also be provided with a wastewater electromagnetic valve. The pure water backflow branch can also be provided with a check valve.

[0057] The raw water parameter detection device and the pure water parameter detection device can be selected as needed. In one embodiment, the raw water parameter detection device comprises a raw water TDS tester connected to the controller, and the pure water parameter detection device comprises a pure water TDS tester connected to the controller. The backflow switch can be an inlet electromagnetic valve.

[0058] The working state of the water purification device includes at least a normal water production mode, a standby state and a pure water backflow mode. In the process of normal water production, the reverse osmosis device filters the raw water introduced by the raw water branch and outputs to the pure water branch, the inlet electromagnetic valve in the pure water backflow branch is in a closed state, and the pure water does not backflow. In the pure water backflow process, the inlet electromagnetic valve in the pure water backflow branch is in an open state, the pure water at the water outlet end of the reverse osmosis device flows back to the water inlet end of the reverse osmosis device, the backflowing pure water mixes with the raw water of the raw water branch before the reverse osmosis membrane filter element, and the TDS of the raw water side is reduced. In the pure water backflow process, the wastewater is normally discharged. In the standby state, the reverse osmosis device is in a stationary state.

[0059] ​The backflow control method of the water purification device provided by the embodiments of the present application can be applied to the water purification device as shown in Figure 1 Specifically, the controller obtains the raw water quality parameter detection value through the raw water parameter detection device and the purified water quality parameter detection value through the purified water parameter detection device; determines the maximum allowable change value of the purified water quality parameter according to the raw water quality parameter detection value; adjusts the backflow control parameter if the purified water quality parameter detection value exceeds the maximum allowable change value to obtain an updated backflow control parameter; controls the backflow switch in the purified water backflow branch to be turned on according to the updated backflow control parameter after the water purification device finishes producing water, so that the purified water backflow branch is turned on; and the change amount of the purified water quality in the process of backflow of the purified water backflow branch with the updated backflow control parameter is greater than the change amount of the purified water quality in the process of backflow of the purified water backflow branch with the backflow control parameter before the update. Thus, the water quality on the raw water side of the reverse osmosis device is effectively improved, the TDS concentration on the raw water side is reduced, the backflow effect can be enhanced, the TDS concentration on the purified water side is reduced, and the control of the TDS concentration of the first cup of purified water is realized.

[0060] In one embodiment, as shown in Figure 2 A backflow control method of a water purification device is provided, and the controller in Figure 1 is taken as an example to illustrate the method, which includes the following steps 200-500.

[0061] Step 200: Obtain a raw water quality parameter detection value and a purified water quality parameter detection value.

[0062] The raw water quality parameter detection value can include a raw water TDS concentration detection value, and the purified water quality parameter detection value can include a purified water TDS concentration detection value.

[0063] The controller can obtain the raw water quality parameter detection value and the purified water quality parameter detection value during the water production process of the water purification device (i.e. in the normal water production mode) or after the water production of the water purification device is finished. The controller can obtain the raw water quality parameter detection value and the purified water quality parameter detection value once, and the obtaining time can be set according to the actual situation, for example, the raw water flow is stable, or a certain period of time after the water production is started, or at the moment when the water production is finished. The controller can also obtain the raw water quality parameter detection value and the purified water quality parameter detection value at intervals, which can be set according to the actual situation.

[0064] Step 300: Determine the maximum allowable change value of the purified water quality parameter according to the raw water quality parameter detection value.

[0065] It can be understood that if the raw water TDS concentration value is high, the salt of the water on the raw water side of the reverse osmosis membrane will penetrate to the pure water side under the action of osmotic pressure in the standby state of the water purification equipment. The longer the standby time, the more salt will penetrate, resulting in a higher TDS concentration value on the pure water side. When the water purification equipment restarts water production, the TDS value of the first cup of water will be high.

[0066] In this embodiment, when determining the maximum allowable change value of the pure water quality parameter according to the raw water quality parameter detection value, the maximum allowable change value of the pure water quality parameter can be calculated according to the raw water quality parameter detection value and the standby time. The standby time can be a preset fixed value; or the controller can calculate the value according to the water production start time of the current water production process and the last filtration end time of the reverse osmosis device when controlling the water purification equipment to enter the normal water production mode. The maximum allowable change value of the pure water quality parameter can be used to represent the maximum allowable change degree of the TDS concentration on the pure water side during the standby time.

[0067] Step 400, if the pure water quality parameter detection value exceeds the maximum allowable change value, adjust the backflow control parameter to obtain an updated backflow control parameter.

[0068] The backflow control parameter includes part or all of the backflow waiting time length between the backflow start time and the water purification equipment water production end time, the single backflow duration in the pure water backflow mode, and the allowed maximum standby time length after the pure water backflow ends.

[0069] Specifically, the controller starts timing at the water production end time, if the timing length reaches the backflow waiting time length, and no instruction to start the normal water production mode is received, the pure water backflow branch is turned on to enter the pure water backflow mode. The duration of each conduction of the pure water backflow branch is the single backflow duration, that is, the timing starts from the backflow start time, and when the single backflow duration is reached, the pure water backflow branch is controlled to be turned off, and the backflow ends. The controller also starts timing again from the backflow end time, if the timing length reaches the allowed maximum standby time length, and no instruction to start the normal water production mode is received, the pure water backflow branch is turned on again to enter the pure water backflow mode.

[0070] When adjusting the backflow control parameter, one of the backflow waiting time length, the single backflow duration, and the allowed maximum standby time length can be adjusted, and the other two are unchanged; two of them can be adjusted, and the other one is unchanged; or all three can be adjusted. When adjusting one, the single backflow duration can be increased, or the backflow waiting time length can be reduced, or the allowed maximum standby time length can be reduced. When adjusting two, two of them can be adjusted according to the actual situation.

[0071] Step 500, after water production of the water purification device is completed, the pure water backflow branch is controlled to be turned on according to the updated backflow control parameter.

[0072] Specifically, in the process of backflow of the pure water backflow branch with the updated backflow control parameter, the change amount of the pure water quality is greater than that in the process of backflow with the backflow control parameter before being updated.

[0073] It can be understood that if the pure water quality parameter detection value exceeds the maximum allowable change value, it indicates that the TDS concentration of the pure water side will be higher after the current backflow control parameter is used for backflow and standby for a length of time, resulting in a higher TDS concentration of the first cup of pure water. At this time, by adjusting the backflow control parameter, the change of the pure water quality can be made greater in the pure water backflow mode, thereby effectively reducing the TDS concentration of the raw water side of the reverse osmosis device.

[0074] For example, if the backflow control parameter is adjusted, specifically, the single backflow duration is increased, for the raw water side of the reverse osmosis device, the amount of pure water mixed with the raw water through backflow is increased, so that the TDS of the raw water side can be reduced to a lower value. Then in the process of standing by after backflow is completed, the amount of water salt ions permeating to the pure water side is reduced more, and the TDS of the raw water side is reduced more.

[0075] If the backflow control parameter is adjusted, specifically, the backflow waiting duration is reduced, thereby shortening the standing time between the backflow start time and the water production end time, so that the time for water salt ions of the raw water side of the reverse osmosis device to permeate to the pure water side is shortened, thereby the amount of water salt ions permeating to the pure water side is reduced more, and the TDS of the raw water side is reduced more.

[0076] If the backflow control parameter is adjusted, specifically, the maximum allowed standby duration is reduced, thereby shortening the standing time between the last backflow end time and the current backflow start time, which can also shorten the time for water salt ions of the raw water side of the reverse osmosis device to permeate to the pure water side, thereby the amount of water salt ions permeating to the pure water side is reduced more, and the TDS of the raw water side is reduced more.

[0077] The backflow control method of the water purification device obtains a raw water quality parameter detection value and a pure water quality parameter detection value; determines a maximum allowable change value of the pure water quality parameter according to the raw water quality parameter detection value; adjusts a backflow control parameter if the pure water quality parameter detection value exceeds the maximum allowable change value to obtain an updated backflow control parameter; and controls the pure water backflow branch to be turned on according to the updated backflow control parameter after water production of the water purification device ends. In the process of backflow of the pure water backflow branch with the updated backflow control parameter, the change amount of the pure water quality is greater than the change amount of the pure water quality in the process of backflow with the backflow control parameter before being updated. Therefore, the backflow control parameter is adjusted adaptively according to actual values of the raw water quality and the pure water quality, so as to reduce the TDS concentration on the pure water side of the reverse osmosis device and realize control of the TDS concentration of the first cup of pure water.

[0078] It can be understood that if the pure water quality parameter detection value is less than or equal to the maximum allowable change value, it indicates that the TDS concentration on the pure water side after the standby time is still able to meet the requirements, and in this case, the backflow control parameter can not be adjusted. In order to leave sufficient margin for the TDS concentration on the pure water side (so that the TDS concentration on the pure water side is low enough), the backflow control parameter can also be adjusted when the pure water quality parameter detection value is equal to the maximum allowable change value, for example, the single backflow duration is increased, so as to ensure that the first cup of pure water has a low TDS concentration.

[0079] In another embodiment, as shown in FIG. 6, after step 300, the backflow control method of the water purification device further includes steps 600 and 700. Figure 3

[0080] In step 600, if the pure water quality parameter detection value is lower than the maximum allowable change value, the backflow control parameter is adjusted to obtain an updated backflow control parameter.

[0081] Since in the pure water backflow mode, the pure water at the water outlet of the reverse osmosis device flows back to the water inlet of the reverse osmosis device, and the waste water branch is always discharging waste water, when the pure water quality parameter detection value is lower than the maximum allowable change value, the backflow control parameter can be adjusted correspondingly.

[0082] When the backflow control parameter is adjusted, one of the backflow waiting duration, the single backflow duration and the maximum allowable standby time can be adjusted, two of them can be adjusted, or all of them can be adjusted. When one of them is adjusted, the backflow waiting duration can be increased, or the single backflow duration can be reduced or the maximum allowable standby time can be increased. When two of them are adjusted, two of them can be selected for adjustment according to actual conditions.

[0083] In step 700, after water production of the water purification device ends, the pure water backflow branch is controlled to be turned on according to the updated backflow control parameter.

[0084] ​The variation of the raw water quality in the process of the pure water reflux branch refluxing with the updated reflux control parameter is less than the variation of the raw water quality in the process of the pure water reflux branch refluxing with the un-updated reflux control parameter.

[0085] It can be understood that although the variation of the raw water quality in the process of the pure water reflux branch refluxing with the updated reflux control parameter is less than the variation of the raw water quality in the process of the pure water reflux branch refluxing with the un-updated reflux control parameter, the improvement degree of the raw water quality in the process of the pure water reflux branch refluxing with the updated reflux control parameter still meets the requirements, that is, the requirement of reducing the TDS concentration of the raw water and ensuring that the first cup of pure water has a low TDS concentration.

[0086] In the embodiment, in the case that the pure water quality parameter detection value is lower than the maximum allowable variation value, the reflux control parameter is adjusted, and then the pure water reflux mode is entered based on the adjusted reflux control parameter, so that the discharge amount of the waste water can be reduced and the water resource can be saved.

[0087] Further, in an embodiment, the step 600 can further include: if the difference between the maximum allowable variation value and the pure water quality parameter detection value reaches a preset adjustment threshold, adjusting the reflux control parameter to obtain an updated reflux control parameter. The variation of the raw water quality in the process of the pure water reflux branch refluxing with the updated reflux control parameter is less than the variation of the raw water quality in the process of the pure water reflux branch refluxing with the un-updated reflux control parameter.

[0088] The preset adjustment threshold can be set according to actual needs. When the difference between the maximum allowable variation value and the pure water quality parameter detection value does not reach the preset adjustment threshold, the reflux control parameter is not adjusted, so that the TDS concentration of the pure water side is low enough and the first cup of pure water has a low TDS concentration. When the difference between the maximum allowable variation value and the pure water quality parameter detection value reaches the preset adjustment threshold, the reflux control parameter is adjusted, so that the water resource can be saved on the basis of ensuring that the first cup of pure water has a low TDS concentration.

[0089] Specifically, the way of adjusting the reflux control parameter is not unique. In an embodiment, the adjusting of the reflux control parameter in the step 400 includes: adjusting the reflux control parameter according to a preset parameter variation.

[0090] The preset parameter variation includes a preset single reflux duration increasing amount, a reflux waiting duration decreasing amount and an allowed longest standby duration decreasing amount. The values of the variations can be set according to actual situations.

[0091] When adjusting the single backflow duration, the single backflow duration can be increased by a single backflow duration increase amount. When adjusting the backflow waiting duration, the backflow waiting duration can be decreased by a backflow waiting duration decrease amount. When adjusting the allowed maximum standby duration, the allowed maximum standby duration can be decreased by an allowed maximum standby duration decrease amount.

[0092] In another embodiment, the adjusting the backflow control parameter in step 400 comprises: determining a variation amount of the backflow control parameter according to a relationship between the pure water quality parameter detection value and the maximum allowed variation value; and adjusting the backflow control parameter according to the variation amount of the backflow control parameter.

[0093] In this embodiment, the relationship between the pure water quality parameter detection value and the maximum allowed variation value can be a difference relationship or a proportional relationship. The controller is preset with variation amounts of each parameter corresponding to the relationship between the two, and after the relationship between the two is determined, the variation amount of each parameter can be obtained according to the relationship.

[0094] Since the variation amount of each parameter is set according to the actual situation detected at present, the variation amount adjustment of each parameter will be more accurate, so that the backflow quality can be better balanced and water resource waste can be reduced.

[0095] In one embodiment, the adjusting the backflow control parameter in step 600 comprises: adjusting the backflow control parameter according to a preset parameter variation amount.

[0096] The preset parameter variation amount includes a preset single backflow duration decrease amount, a backflow waiting duration increase amount, and an allowed maximum standby duration increase amount. The values of the variation amounts can be set in combination with the actual situation, the single backflow duration increase amount and the single backflow duration decrease amount can be equal or not equal, the backflow waiting duration decrease amount and the backflow waiting duration increase amount can be equal or not equal, and the allowed maximum standby duration decrease amount and the allowed maximum standby duration increase amount can be equal or not equal.

[0097] When adjusting the single backflow duration, the single backflow duration can be decreased by a single backflow duration decrease amount. When adjusting the backflow waiting duration, the backflow waiting duration can be increased by a backflow waiting duration increase amount. When adjusting the allowed maximum standby duration, the allowed maximum standby duration can be increased by an allowed maximum standby duration increase amount.

[0098] In another embodiment, the adjusting the backflow control parameter in step 600 comprises: determining a variation amount of the backflow control parameter according to a relationship between the pure water quality parameter detection value and the maximum allowed variation value; and adjusting the backflow control parameter according to the variation amount of the backflow control parameter.

[0099] The embodiment can refer to the above embodiment. The relationship between the pure water quality parameter detection value and the maximum allowable change value can be a difference relationship or a proportional relationship. The controller is preconfigured with the change amount of each parameter corresponding to the relationship between the two. After determining the relationship between the two, the change amount of each parameter can be obtained according to the relationship. The embodiment can realize accurate adjustment of the backflow control parameter.

[0100] In one embodiment, as shown in Figure 4 the initial value of the backflow control parameter is determined by the steps 810 and 820.

[0101] Step 810: During the initial water production of the water purification device, the raw water quality parameter detection value is obtained.

[0102] Step 820: The initial value of the backflow control parameter is determined according to the relationship between the raw water quality parameter detection value and the water quality threshold value.

[0103] The initial value of the backflow control parameter includes the initial value of the backflow waiting time, the initial value of the single backflow duration and the initial value of the maximum standby duration.

[0104] The water quality threshold value can be set according to actual needs. When determining the initial value of the backflow control parameter according to the relationship between the raw water quality parameter detection value and the water quality threshold value, the initial value of each parameter corresponding to the relationship between the raw water quality parameter detection value and the water quality threshold value can be determined. For example, the controller can compare the size relationship between the raw water quality parameter detection value and the water quality threshold value. When the raw water quality parameter detection value is greater than the water quality threshold value, a set of preconfigured parameter values is determined as the initial value of each parameter. When the raw water quality parameter detection value is less than or equal to the water quality threshold value, another set of preconfigured parameter values is determined as the initial value of each parameter. The two sets of preconfigured parameter values need to be set according to the water quality threshold value, the parameters of the water purification device and actual needs. The controller can first calculate the ratio relationship between the raw water quality parameter detection value and the water quality threshold value, and then determine the initial value of each parameter corresponding to the ratio relationship.

[0105] In actual implementation, the raw water quality parameter detection value can be obtained during the initial water production of the water purification device to determine the initial value of the backflow control parameter, and after the initial water production is completed, the pure water backflow mode is entered according to the initial value. During the second water production process, it is determined whether the initial value needs to be adjusted according to the actual situation of the water quality. If the updated backflow control parameter is obtained by adjustment, the pure water backflow mode is entered according to the updated backflow control parameter after the second water production is completed. It can be understood that during each water production process, it is determined whether the previous backflow control parameter needs to be adjusted according to the actual situation of the water quality, so that the backflow control parameter of the next pure water backflow is more in line with the actual situation, and the TDS concentration of the reverse osmosis device pure water side meets the requirements.

[0106] In this embodiment, the initial value of the backflow control parameter is determined according to the raw water quality parameter detection value and the water quality threshold value, so that the initial value is more matched with the water quality of the use environment, and the reliability of the initial value is higher.

[0107] In one embodiment, the number of water quality thresholds is at least two, and each water quality threshold forms a water quality parameter threshold range of multiple gears; step 820 comprises: determining the initial value of the backflow control parameter according to the water quality parameter threshold range corresponding to the raw water quality parameter detection value.

[0108] The number of water quality thresholds can be set according to the control needs, and each water quality threshold can be set according to the control needs and the parameters of the water purification equipment.

[0109] For example, the number of water quality thresholds is two, which are a first water quality threshold and a second water quality threshold, and the first water quality threshold is greater than the second water quality threshold. In this way, three gear water quality parameter threshold ranges can be formed by the first water quality threshold being greater than the second water quality threshold, the first gear range being greater than the first water quality threshold, the second gear range being greater than the second water quality threshold and less than or equal to the first water quality threshold, and the third gear range being less than or equal to the second water quality threshold.

[0110] If the raw water quality parameter detection value is greater than the first water quality parameter threshold, the initial value of the single backflow duration is set to T1s (seconds), the initial value of the backflow waiting duration is set to T4min (minutes) after the water production is completed, and the initial value of the allowed maximum standby duration is set to T7h (hours).

[0111] If the second water quality threshold is less than the raw water quality parameter detection value and less than or equal to the first water quality threshold, the initial value of the single backflow duration is set to T2, the initial value of the backflow waiting duration is set to T5min after the water production is completed, and the initial value of the allowed maximum standby duration is set to T8h.

[0112] If the raw water quality parameter detection value is less than or equal to the second water quality threshold, the initial value of the single backflow duration is set to T3, the initial value of the backflow waiting duration is set to T6min after the water production is completed, and the initial value of the allowed maximum standby duration is set to T9h.

[0113] The values of T1, T2, T3, T4, T5, T6, T7, T8 and T9 can be set according to actual conditions. Preferably, T1>T2>T3, T4

[0114] In this embodiment, the reflux control parameters of the pure water reflux mode can be set in different levels according to the raw water TDS. Then, by continuously comparing the pure water TDS during water production, the system can automatically adjust the relevant parameters of the pure water reflux mode, such as the single reflux duration, reflux waiting time, and maximum allowable standby time. This enables automatic adjustment of the pure water TDS for the first cup of water of different water qualities and users, ensuring that the TDS of the first cup of water meets the requirements.

[0115] In one embodiment, such as Figure 5 As shown, step 300 includes steps 310 and 320.

[0116] Step 310: During the water purification process of the water purification equipment, obtain the standby time between the start time of water production and the end time of the previous filtration of the reverse osmosis device.

[0117] In this embodiment, during the water production process, the controller records the start time of this water production and the standby time Tmin between the start time and the end time of the previous pure water reflux mode.

[0118] Step 320: Determine the maximum allowable variation value of the pure water quality parameters based on the raw water quality parameter test values ​​and the settling time.

[0119] Specifically, firstly, the parameters affecting the raw water quality are determined based on the measured values ​​of the raw water quality parameters and preset parameters; then, based on the settling time and the parameters affecting the raw water quality, the maximum allowable variation value of the pure water quality parameters is obtained according to the preset formula.

[0120] For example, the parameters affecting the raw water quality can be determined based on Equation 1 below:

[0121] c = TDS 原水 *(1-P) Equation 1

[0122] Where c represents the raw water quality influencing parameter, TDS 原水 This represents the measured value of raw water quality parameters, where P is a preset coefficient.

[0123] The preset relation can be:

[0124] A = aT 2 +bT+c Equation 2

[0125] Where A represents the maximum allowable variation of pure water quality parameters, T represents the standby time, and a and b are preset coefficients. a, b, and P can be set according to actual conditions, with a≥0 and 0<P≤1.

[0126] As can be seen from Equation 2 above, the maximum allowable variation value A of the pure water quality parameters can characterize the preset maximum allowable variation of the concentration of TDS in pure water during the standby time T.

[0127] In this embodiment, the maximum allowable change value of the pure water quality parameter is determined according to the actual detection value of the raw water, and then whether the current pure water backflow mode meets the requirements is evaluated according to the actually detected pure water TDS level, and the evaluation result is more accurate. In the case of not meeting the requirements, the backflow control parameter is adjusted according to the actual detection value of the pure water, the adaptive adjustment of the backflow control parameter is realized, and the TDS concentration of the pure water is truly reduced to meet the requirements of the user.

[0128] The backflow control method of the water purification device adjusts the maximum allowable change value dynamically in the manner of detecting the water quality of the raw water and the pure water, sets different backflow control parameters for different raw water qualities, and adaptively adjusts the flushing time of the filter element of the reverse osmosis device, which can avoid excessive flushing and ensure complete flushing. Moreover, the length of time, the starting time, and the maximum allowable standby time of the pure water backflow are adaptively adjusted, and the backflow effect of the water taken at different times is comprehensively ensured.

[0129] It should be understood that although each step in the flowchart involved in each of the above-described embodiments is displayed in sequence according to the arrow, these steps are not necessarily executed in sequence according to the arrow. Unless otherwise specified herein, the execution of these steps is not strictly limited in sequence, and these steps can be executed in other sequences. Moreover, at least part of the steps in the flowchart involved in each of the above-described embodiments can include multiple steps or stages, which are not necessarily executed at the same time, but can be executed at different times, and the execution sequence of these steps or stages is not necessarily sequential, but can be executed alternately or alternately with at least part of other steps or steps or stages in other steps.

[0130] Based on the same inventive concept, the embodiments of the present application also provide a backflow control device of a water purification device for implementing the above-mentioned backflow control method of the water purification device. The implementation scheme for solving the problem provided by the device is similar to the implementation scheme described in the above method, and therefore the specific limitations in one or more backflow control device embodiments of the water purification device provided below can refer to the limitations of the backflow control method of the water purification device described above, which will not be repeated here.

[0131] In one embodiment, as shown in Figure 6 A backflow control device of a water purification device is provided, a water inlet end of a reverse osmosis device of the water purification device is communicated with a raw water branch, and a water outlet end is communicated with a pure water branch; a pure water backflow branch is arranged between the water outlet end and the water inlet end of the reverse osmosis device, and when the pure water backflow branch is conducted, the pure water at the water outlet end of the reverse osmosis device flows back to the water inlet end. The backflow control device of the water purification device comprises a parameter acquisition module 910, a threshold determination module 920, a parameter adjustment module 930, and a backflow control module 940, wherein:

[0132] The parameter acquisition module 910 is configured to acquire the raw water quality parameter detection value and the pure water quality parameter detection value.

[0133] The threshold determination module 920 is configured to determine the maximum allowable change value of the pure water quality parameter according to the raw water quality parameter detection value.

[0134] The parameter adjustment module 930 is configured to adjust the backflow control parameter to obtain an updated backflow control parameter if the pure water quality parameter detection value exceeds the maximum allowable change value.

[0135] The backflow control module 940 is configured to control the pure water backflow branch to be turned on according to the updated backflow control parameter after water production of the water purification device ends, and a change amount of the pure water quality in a process in which the pure water backflow branch backflows according to the updated backflow control parameter is greater than a change amount of the pure water quality in a process in which the pure water backflow branch backflows according to a previous backflow control parameter.

[0136] In an embodiment, the threshold determination module 920 is further configured to acquire a static standby duration between a water production start time and a previous filtration end time of the reverse osmosis device in a water production process of the water purification device, and determine the maximum allowable change value of the pure water quality parameter according to the raw water quality parameter detection value and the static standby duration.

[0137] In an embodiment, as shown in FIG. 9, the backflow control device of the water purification device further includes an initial value determination module 950. The initial value determination module 950 is configured to acquire the raw water quality parameter detection value in a first water production process of the water purification device, and determine an initial value of the backflow control parameter according to a relationship between the raw water quality parameter detection value and a water quality threshold value. Figure 7

[0138] In an embodiment, the initial value determination module 950 is further configured to determine the initial value of the backflow control parameter according to a water quality parameter threshold value range corresponding to the raw water quality parameter detection value.

[0139] In an embodiment, the parameter adjustment module 930 is further configured to adjust the backflow control parameter to obtain an updated backflow control parameter if the pure water quality parameter detection value is lower than the maximum allowable change value.

[0140] The backflow control module 940 is further configured to control the pure water backflow branch to be turned on according to the updated backflow control parameter after water production of the water purification device ends, and a change amount of the pure water quality in a process in which the pure water backflow branch backflows according to the updated backflow control parameter is greater than a change amount of the pure water quality in a process in which the pure water backflow branch backflows according to a previous backflow control parameter.

[0141] In an embodiment, the parameter adjustment module 930 is further configured to adjust the backflow control parameter according to a preset parameter change amount. ​

[0142] In an embodiment, the parameter adjustment module 930 is further configured to determine a variation of the backflow control parameter according to a relationship between the pure water quality parameter detection value and the maximum allowable variation value; and adjust the backflow control parameter according to the variation of the backflow control parameter.

[0143] In an embodiment, the parameter adjustment module 930 is further configured to adjust at least one of the backflow duration, the backflow waiting duration, and the maximum standby duration.

[0144] The above modules in the backflow control device of the water purification device can be implemented wholly or partially by software, hardware, or a combination thereof. The above modules can be embedded in or independent of a processor in a computer device in hardware form, or stored in a memory in a computer device in software form, so as to be called and executed by the processor to perform the operations corresponding to the above modules.

[0145] In an embodiment, a computer readable storage medium is provided, which stores a computer program. The computer program is executed by a processor to implement the following steps:

[0146] obtain a raw water quality parameter detection value and a pure water quality parameter detection value;

[0147] determine a maximum allowable variation value of the pure water quality parameter according to the raw water quality parameter detection value;

[0148] if the pure water quality parameter detection value exceeds the maximum allowable variation value, adjust the backflow control parameter to obtain an updated backflow control parameter;

[0149] after water production of the water purification device ends, control the pure water backflow branch to be conducted according to the updated backflow control parameter; and during backflow of the pure water backflow branch with the updated backflow control parameter, a variation of the pure water quality is greater than a variation of the pure water quality during backflow with a backflow control parameter before the update.

[0150] In an embodiment, the computer program is executed by the processor to further implement the following steps: during water production of the water purification device, obtain a standby duration between a water production start time and a last filtration end time of the reverse osmosis device; and determine the maximum allowable variation value of the pure water quality parameter according to the raw water quality parameter detection value and the standby duration.

[0151] In an embodiment, the computer program is executed by the processor to further implement the following steps: during initial water production of the water purification device, obtain the raw water quality parameter detection value; and determine an initial value of the backflow control parameter according to a relationship between the raw water quality parameter detection value and a water quality threshold value.

[0152] In one embodiment, the computer program, when executed by the processor, further implements the following steps: determining the initial value of the backflow control parameter according to the water quality parameter threshold range corresponding to the raw water quality parameter detection value.

[0153] In one embodiment, the computer program, when executed by the processor, further implements the following steps: adjusting the backflow control parameter to obtain an updated backflow control parameter if the pure water quality parameter detection value is lower than the maximum allowable change value; controlling the pure water backflow branch to be turned on according to the updated backflow control parameter after water production of the water purification device ends; and the change amount of the pure water quality in the process of the pure water backflow branch backflowing with the updated backflow control parameter is less than the change amount of the pure water quality in the process of the pure water backflow branch backflowing with the backflow control parameter before being updated.

[0154] In one embodiment, the computer program, when executed by the processor, further implements the following steps: adjusting the backflow control parameter according to the preset parameter change amount.

[0155] In one embodiment, the computer program, when executed by the processor, further implements the following steps: determining the change amount of the backflow control parameter according to the relationship between the pure water quality parameter detection value and the maximum allowable change value; and adjusting the backflow control parameter according to the change amount of the backflow control parameter.

[0156] In one embodiment, the computer program, when executed by the processor, further implements the following steps: adjusting at least one of the backflow duration, the backflow waiting duration, and the longest standby duration.

[0157] In one embodiment, a computer program product is provided, comprising a computer program which, when executed by a processor, implements the following steps:

[0158] obtaining a raw water quality parameter detection value and a pure water quality parameter detection value;

[0159] determining a maximum allowable change value of the pure water quality parameter according to the raw water quality parameter detection value;

[0160] adjusting the backflow control parameter to obtain an updated backflow control parameter if the pure water quality parameter detection value exceeds the maximum allowable change value;

[0161] controlling the pure water backflow branch to be turned on according to the updated backflow control parameter after water production of the water purification device ends; and the change amount of the pure water quality in the process of the pure water backflow branch backflowing with the updated backflow control parameter is greater than the change amount of the pure water quality in the process of the pure water backflow branch backflowing with the backflow control parameter before being updated.

[0162] In one embodiment, the computer program, when executed by the processor, further implements the following steps: obtaining a static standby duration between a water production start time and a last filtration end time of the reverse osmosis device during water production by the water purification device; determining the maximum allowable variation value of the pure water quality parameter according to the raw water quality parameter detection value and the static standby duration.

[0163] In one embodiment, the computer program, when executed by the processor, further implements the following steps: obtaining a raw water quality parameter detection value during initial water production by the water purification device; determining an initial value of the backflow control parameter according to a relationship between the raw water quality parameter detection value and the water quality threshold value.

[0164] In one embodiment, the computer program, when executed by the processor, further implements the following steps: determining an initial value of the backflow control parameter according to a water quality parameter threshold value range corresponding to the raw water quality parameter detection value.

[0165] In one embodiment, the computer program, when executed by the processor, further implements the following steps: adjusting the backflow control parameter to obtain an updated backflow control parameter if the pure water quality parameter detection value is lower than the maximum allowable variation value; controlling the pure water backflow branch to be turned on according to the updated backflow control parameter after water production by the water purification device ends; and the change in the pure water quality during backflow of the pure water backflow branch with the updated backflow control parameter is less than the change in the pure water quality during backflow of the pure water backflow branch with the previous backflow control parameter.

[0166] In one embodiment, the computer program, when executed by the processor, further implements the following steps: adjusting the backflow control parameter according to a preset parameter variation.

[0167] In one embodiment, the computer program, when executed by the processor, further implements the following steps: determining a variation of the backflow control parameter according to a relationship between the pure water quality parameter detection value and the maximum allowable variation value; and adjusting the backflow control parameter according to the variation of the backflow control parameter.

[0168] In one embodiment, the computer program, when executed by the processor, further implements the following steps: adjusting at least one of the backflow duration, the backflow waiting duration, and the maximum standby duration.

[0169] Those skilled in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be completed by instructing the relevant hardware through a computer program. The computer program can be stored in a non-volatile computer readable storage medium, and when the computer program is executed, the processes of the above-mentioned embodiments of the methods can be included. Any reference to memory, database or other medium used in the embodiments provided in the present application can include at least one of non-volatile and volatile memory. Non-volatile memory can include read-only memory (Read-Only Memory, ROM), magnetic tape, floppy disk, flash memory, optical storage, high-density embedded non-volatile memory, resistive memory (ReRAM), magnetoresistive random access memory (Magnetoresistive Random Access Memory, MRAM), ferroelectric memory (Ferroelectric Random Access Memory, FRAM), phase change memory (Phase Change Memory, PCM), graphene memory, etc. Volatile memory can include random access memory (Random Access Memory, RAM) or external cache memory, etc. As an illustration but not limitation, RAM can be in various forms, such as static random access memory (Static Random Access Memory, SRAM) or dynamic random access memory (Dynamic Random Access Memory, DRAM), etc. The database involved in the embodiments provided in the present application can include at least one of a relational database and a non-relational database. The non-relational database can include a distributed database based on a block chain, etc., without being limited thereto. The processor involved in the embodiments provided in the present application can be a general-purpose processor, a central processing unit, a graphics processing unit, a digital signal processor, a programmable logic device, a data processing logic device based on quantum computing, etc., without being limited thereto.

[0170] Any combination of the technical features of the above embodiments can be made. In order to make the description simple, all possible combinations of the technical features in the above embodiments are not described, however, as long as the combination of the technical features does not exist contradictory, it should be considered as the scope of the present application.

[0171] The above embodiments only express several implementation manners of the present application, and the description is more specific and detailed, but it should not be understood as a limitation on the scope of the patent of the present application. It should be pointed out that for ordinary skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which are within the scope of protection of the present application. Therefore, the protection scope of the present application should be subject to the appended claims.

Claims

1. A backflow control method of a water purifying apparatus, characterized by, The water inlet end of the reverse osmosis device of the water purification equipment is connected with a raw water branch, and the water outlet end is connected with a pure water branch; a pure water backflow branch is arranged between the water outlet end and the water inlet end of the reverse osmosis device, and when the pure water backflow branch is conducted, the pure water at the water outlet end of the reverse osmosis device flows back to the water inlet end; The backflow control method comprises: obtaining a raw water quality parameter detection value and a pure water quality parameter detection value; determining a maximum allowable change value of the pure water quality parameter according to the raw water quality parameter detection value; if the pure water quality parameter detection value exceeds the maximum allowable change value, adjusting a backflow control parameter to obtain an updated backflow control parameter; after water production of the water purification equipment ends, controlling the pure water backflow branch to be conducted according to the updated backflow control parameter; during the process in which the pure water backflow branch flows back at the updated backflow control parameter, the change amount of the pure water quality is greater than that during the process in which the pure water backflow branch flows back at the backflow control parameter before being updated. The method for determining the maximum allowable change value of the pure water quality parameter according to the raw water quality parameter detection value comprises: obtaining a static standby time length between a water production start time and a last filtration end time of the reverse osmosis device during the process of water production of the water purification equipment; determining an influence parameter of the raw water quality according to the raw water quality parameter detection value and a preset parameter; and obtaining the maximum allowable change value of the pure water quality parameter based on a preset relationship according to the static standby time length and the influence parameter of the raw water quality.

2. The method of claim 1, wherein, The preset relationship is: A = aT 2 + bT + c; wherein A represents a maximum allowable variation value of a pure water quality parameter, T represents a static standby duration, c represents an influence parameter of the raw water quality, a and b are preset coefficients, and a > 0.

3. The method of claim 1, wherein, The method for determining the initial value of the backflow control parameter comprises: obtaining a raw water quality parameter detection value during the process of initial water production of the water purification equipment; determining the initial value of the backflow control parameter according to the relationship between the raw water quality parameter detection value and a water quality threshold value.

4. The method of claim 3, wherein, The number of the water quality threshold values is at least two, and each water quality threshold value forms a water quality parameter threshold value range of multiple gears; the method for determining the initial value of the backflow control parameter according to the relationship between the raw water quality parameter detection value and the water quality threshold value comprises: determining the initial value of the backflow control parameter according to the water quality parameter threshold value range corresponding to the raw water quality parameter detection value.

5. The method of claim 1, wherein, After the maximum allowable change value of the pure water quality parameter is determined according to the raw water quality parameter detection value, the method further comprises: if the pure water quality parameter detection value is lower than the maximum allowable change value, adjusting the backflow control parameter to obtain an updated backflow control parameter; after water production of the water purification equipment ends, controlling the pure water backflow branch to be conducted according to the updated backflow control parameter; during the process in which the pure water backflow branch flows back at the updated backflow control parameter, the change amount of the pure water quality is greater than that during the process in which the pure water backflow branch flows back at the backflow control parameter before being updated.

6. The method according to claim 1 or 5, characterized in that, The method for adjusting the backflow control parameter comprises: adjusting the backflow control parameter according to a preset parameter change amount.

7. The method according to claim 1 or 5, characterized in that, The method for adjusting the backflow control parameter to obtain an updated backflow control parameter comprises: determining a change amount of the backflow control parameter according to the relationship between the pure water quality parameter detection value and the maximum allowable change value; adjusting the backflow control parameter according to the change amount of the backflow control parameter.

8. The method of claim 1, wherein, The backflow control parameters include: a single backflow duration in the pure water backflow mode, a backflow waiting duration between a backflow starting time and a water production ending time of the water purification device, and a maximum standby duration allowed after the pure water backflow ends. The adjusting the backflow control parameters includes: adjusting at least one of the backflow duration, the backflow waiting duration, and the maximum standby duration.

9. A backflow control device for a water purification apparatus, characterized by comprising: The water purification device includes: The parameter acquisition module is configured to acquire raw water quality parameter detection values and pure water quality parameter detection values. The threshold determination module is configured to determine a maximum allowable change value of the pure water quality parameter based on the raw water quality parameter detection values. The parameter adjustment module is configured to adjust backflow control parameters if the pure water quality parameter detection values exceed the maximum allowable change value, to obtain updated backflow control parameters. The backflow control module is configured to control the pure water backflow branch to be turned on based on the updated backflow control parameters after water production of the water purification device ends. The controller and the reverse osmosis device, the water inlet end of the reverse osmosis device is communicated with the raw water branch, the water outlet end is communicated with the pure water branch, the water outlet end and the water inlet end of the reverse osmosis device are provided with pure water backflow branch, the pure water backflow branch is turned on, the pure water of the water outlet end of the reverse osmosis device backflows to the water inlet end, the raw water branch is provided with raw water parameter detection device connected with the controller, the pure water branch is provided with pure water parameter detection device connected with the controller, the pure water backflow branch is provided with backflow switch connected with the controller; The controller is configured to control the pure water backflow branch to be turned on according to the method in any one of claims 1 to 8.

10. A water purification apparatus characterized by comprising: The computer program is executed by the processor to implement the steps of the method in any one of claims 1 to 8. The computer program is executed by the processor to implement the steps of the method in any one of claims 1 to 8. ​ 11. A computer readable storage medium having stored thereon a computer program, characterized in that ​ 12. A computer program product comprising a computer program, characterized in that, ​

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