Control method of water purifying apparatus and water purifying apparatus

Abstract

The present application relates to water purification equipment technical field, specifically provide a kind of water purification equipment control method and water purification equipment.The water purification equipment of the present application includes reverse osmosis filter device, water pump, air pump and backflow pipeline, reverse osmosis filter device has raw water import, pure water port and waste water port, second, fourth and backflow pipeline are respectively provided with waste water, water inlet and backflow control valve, first or backflow pipeline is provided with the first air inlet pipeline with valve, air pump is arranged on second air inlet pipeline, control method includes: when satisfying preset starting condition, open waste water, water inlet, backflow control valve and water pump;When first preset condition, close waste water and water inlet control valve;When second preset condition, open waste water control valve and air pump drainage;After drainage is completed, open backflow control valve and water pump water replenishment, by pure water backflow flush reverse osmosis filter device, by air pump waste water, by water pump to reverse osmosis filter device water replenishment, can reduce the TDS value of pure water.

Description

Technical Field

[0001] This invention relates to the field of water purification equipment technology, specifically providing a control method for water purification equipment and water purification equipment. Background Technology

[0002] Reverse osmosis water purifiers, with their excellent filtration performance against impurities, salts, and heavy metals, are widely used in daily drinking water scenarios such as homes and offices. They can effectively purify tap water and produce pure water that meets drinking standards.

[0003] In the operation of existing reverse osmosis water purifiers, the raw water is purified and separated through the RO membrane. During operation, the raw water is filtered through the RO membrane, and the pure water side produces purified water for users. On the wastewater side, salt, impurities and other pollutants in the water are intercepted and formed into high TDS wastewater, thereby achieving the core function of water purification.

[0004] However, existing reverse osmosis water purifiers have significant technical flaws in practical use: when the purifier is left stagnant for a long time without anyone drawing water, a stable concentration difference forms on both sides of the RO membrane. The wastewater side accumulates a large amount of high-concentration salt and impurities, with a TDS value much higher than that of the pure water side. Based on the principle of osmosis, the high-concentration water molecules on the wastewater side slowly diffuse through the RO membrane to the pure water side, causing the salt and impurity content of the originally clean pure water to gradually increase, ultimately leading to a significant increase in the TDS value of the pure water retained inside the RO membrane.

[0005] When a user turns on the device again after a long period of inactivity, the first water to flow out is high-TDS water that has remained in the membrane, meaning the TDS value of the first cup of water is significantly high. This portion of water not only fails to meet purity standards but also directly affects the taste of the drinking water, resulting in a slightly astringent taste and a poorer overall flavor, severely reducing the user's drinking experience.

[0006] Therefore, there is an urgent need for a technical solution that can more accurately and promptly address the high TDS of the first cup of water. Summary of the Invention

[0007] The present invention aims to solve the above-mentioned technical problem, namely, to solve the problem of high TDS in the first cup of water after the existing water purification equipment has completed water purification and is in standby mode.

[0008] In a first aspect, the present invention provides a control method for a water purification device, the water purification device comprising a reverse osmosis filter, a water pump, an air pump, and a return pipeline. The reverse osmosis filter has a raw water inlet, a pure water outlet, and a wastewater outlet. The pure water outlet is connected to the outlet of the water purification device via a first pipeline, and the wastewater outlet discharges wastewater via a second pipeline. The outlet of the water pump is connected to the raw water inlet via a third pipeline, and the inlet of the water pump is connected to a water source via a fourth pipeline. A wastewater control valve is provided on the second pipeline, and an inlet control valve is provided on the fourth pipeline. The two ends of the return pipeline are respectively connected to the first pipeline and the fourth pipeline, and the return pipeline is connected to the fourth pipeline. The connection point of the pipeline is located between the inlet control valve and the inlet end of the water pump. A return control valve is provided on the return pipeline. The water purification equipment also includes a first air inlet pipeline, a second air inlet pipeline, and a valve installed on the first air inlet pipeline. The valve is either a first check valve or an air inlet control valve. The first check valve is open from the first end of the first air inlet pipeline towards the second end. The first end of the first air inlet pipeline is connected to the external environment. The second end of the first air inlet pipeline is connected to the first pipeline, and the connection point is located between the connection point of the return pipeline and the first pipeline and the pure water outlet. Alternatively, the second end of the first air inlet pipeline is connected to the return pipeline and... The point is located between the connection point of the return pipeline and the first pipeline and the return control valve. The first end of the second air inlet pipeline is connected to the external environment, and the second end of the second air inlet pipeline is connected to the first pipeline, the return pipeline, the third pipeline, or the fourth pipeline. When the second air inlet pipeline is connected to the fourth pipeline, the connection point between the second air inlet pipeline and the fourth pipeline is located between the water inlet control valve and the water pump. The air pump is installed on the second air inlet pipeline. The control method includes: after the water purification equipment completes water production, determining whether a preset start-up condition is met; when the preset start-up condition is met, opening the wastewater control valve. The system operates by setting up the inlet control valve and the return control valve, and starting the water pump. It then determines whether a first preset condition has been met. If the first preset condition is met, the system closes the wastewater control valve and the inlet control valve, and the water pump continues to run. The first preset condition includes the running time of the water pump or the TDS value of the water in the water purification device. Next, it determines whether a second preset condition has been met. If the second preset condition is met, the system reopens the wastewater control valve, stops the water pump, and starts the air pump to discharge the wastewater from the reverse osmosis filter. The second preset condition includes the running time of the water pump or the TDS value of the water in the water purification device.

[0009] In the preferred technical solution of the control method for the above-mentioned water purification equipment, the step of "determining whether a first preset condition is met, and closing the wastewater control valve and the inlet control valve when the first preset condition is met" specifically includes: obtaining the running time of the water pump; determining whether the running time of the water pump has reached a second preset time; and closing the wastewater control valve and the inlet control valve when the running time of the water pump reaches the second preset time.

[0010] In the preferred technical solution of the control method for the above-mentioned water purification equipment, the step of "determining whether a first preset condition is met, and closing the wastewater control valve and the inlet control valve when the first preset condition is met" specifically includes: obtaining the TDS value of the wastewater discharged from the wastewater outlet, denoted as the first TDS value T1; obtaining the TDS value of the raw water, denoted as the second TDS value T2; and determining whether to close the wastewater control valve and the inlet control valve based on the first TDS value T1 and the second TDS value T2.

[0011] In the preferred embodiment of the control method for the above-mentioned water purification equipment, the step of "determining whether to close the wastewater control valve and the inlet control valve based on the first TDS value T1 and the second TDS value T2" ​​specifically includes: calculating the difference ΔT between the first TDS value T1 and the second TDS value T2, where ΔT = T1 - T2; comparing the difference ΔT with a preset difference ΔTy; and closing the wastewater control valve and the inlet control valve if the difference ΔT is less than the preset difference ΔTy.

[0012] In the preferred technical solution of the control method for the above-mentioned water purification equipment, the judgment step of "determining whether the second preset condition is met, and when the second preset condition is met, closing the reflux control valve, reopening the wastewater control valve, stopping the water pump and starting the air pump" specifically includes: obtaining the TDS value of the water between the reverse osmosis filter and the water pump, denoted as the third TDS value T3; comparing the third TDS value T3 with the first preset value Ty1; if T3 < Ty1, closing the reflux control valve, reopening the wastewater control valve, stopping the water pump and starting the air pump.

[0013] In the preferred technical solution of the control method for the above-mentioned water purification equipment, the judgment step of "determining whether a second preset condition has been met, and when the second preset condition is met, closing the backflow control valve, reopening the wastewater control valve, stopping the water pump, and starting the air pump" specifically includes: obtaining the running time of the water pump; determining whether the running time of the water pump has reached a third preset time; when the running time of the water pump reaches the third preset time, closing the backflow control valve, reopening the wastewater control valve, stopping the water pump, and starting the air pump.

[0014] In a preferred embodiment of the control method for the aforementioned water purification equipment, the control method further includes: after all the wastewater from the reverse osmosis filtration device is discharged, stopping the air pump and starting the water pump to replenish water to the reverse osmosis filtration device, wherein, if the valve is the air inlet control valve, the air inlet control valve is opened; after the reverse osmosis filtration device is replenished with water, closing the wastewater control valve and the reflux control valve, and stopping the water pump, wherein, if the valve is the air inlet control valve, the air inlet control valve is closed.

[0015] In the preferred embodiment of the control method for the aforementioned water purification equipment, the water purification equipment further includes a pre-filter device, which is disposed on the fourth pipeline. The inlet control valve includes a first control valve and a second control valve. The first control valve is located downstream of the second control valve along the water flow direction. The pre-filter device is disposed between the first control valve and the second control valve. The step of "opening the wastewater control valve, the inlet control valve, and the return flow control valve and starting the water pump when the preset start-up condition is met" specifically includes: opening the wastewater control valve, the first control valve, the second control valve, and the return flow control valve and starting the water pump; "determining whether the first preset condition is met, and upon meeting the first preset condition..." The step of "closing the wastewater control valve and the inlet control valve and continuing to run the water pump under certain conditions" specifically includes: closing the wastewater control valve and the first control valve, and continuing to run the water pump; and / or the water purification equipment further includes a post-filter device, which is installed on the first pipeline and located between the connection point of the return pipeline and the first pipeline and the pure water outlet. When the first air inlet pipeline is connected to the first pipeline, the connection point of the first air inlet pipeline and the first pipeline is located between the pure water outlet and the post-filter device; and / or the water purification equipment further includes a second one-way valve installed on the second air inlet pipeline, which is open along the direction from the first end of the air inlet pipeline toward the second end.

[0016] In the preferred technical solution of the control method for the above-mentioned water purification equipment, the step of "closing the wastewater control valve and the inlet control valve" specifically includes: first closing the wastewater control valve, and then closing the inlet control valve after a fourth preset time; and / or the step of "determining whether the preset start-up condition is met" specifically includes: obtaining the standby time of the water purification equipment; determining whether the standby time has reached a first preset time; and when the standby time reaches the first preset time, determining that the preset start-up condition is met.

[0017] In a second aspect, the present invention also provides a water purification device, which further includes a controller configured to perform the control method described above.

[0018] Those skilled in the art will understand that the water purification device of the present invention, by setting up a return pipeline, a first air inlet pipeline, a second air inlet pipeline, and an air pump, enables pure water to return and, through four steps—rinsing the reverse osmosis filter with water and pure water from the pre-filter, circulating pure water filtration, discharging wastewater from the reverse osmosis filter through the air pump, and replenishing water to the reverse osmosis filter through the water pump—can significantly reduce the TDS value of wastewater and pure water in the reverse osmosis filter, ensuring the purity and taste of pure water in the standby state of the reverse osmosis filter, and improving the user experience.

[0019] Furthermore, the water purification device of the present invention determines whether the first and second preset conditions are met by measuring the running time of the water pump. The control structure is simple and convenient, saving the cost of the water purification device.

[0020] Furthermore, the water purification equipment of the present invention determines whether the first preset condition is met by using the TDS value of wastewater and the TDS value of raw water, and determines whether the second preset condition is met by using the TDS value of the water between the reverse osmosis filter and the water pump. This makes the judgment results more accurate, improves the control precision of the water purification equipment, and further ensures the purity and taste of the pure water in the standby state of the water purification equipment.

[0021] Furthermore, the water purification device of the present invention determines whether the preset start-up conditions are met by the standby time of the water purification device, making the control more convenient.

[0022] Furthermore, the water purification device of the present invention can replenish water in the water purification device by first closing the wastewater control valve and then closing the inlet water control valve, thereby ensuring water pressure. Attached Figure Description

[0023] The preferred embodiments of the present invention are described below with reference to the accompanying drawings, in which: Figure 1 This is a schematic diagram of the water purification device of the present invention; Figure 2 This is a flowchart of the control method for the water purification equipment of the present invention; Figure 3 This is a flowchart of a first embodiment of the control method for the water purification equipment of the present invention; Figure 4 This is a flowchart of a second embodiment of the control method for the water purification equipment of the present invention.

[0024] List of reference numerals in the attached diagram: 1. Reverse osmosis filtration device; 2. Water pump; 3. Return piping; 41. First pipe; 42. Second pipe; 43. Third pipe; 44. Fourth pipe; 45. First intake pipe; 46. Second intake pipe; 51. Wastewater control valve; 52. Second control valve; 53. Return control valve; 54. First control valve; 61. First check valve; 62. Second check valve; 63. Third check valve; 7. Pre-filter; 8. Post-filter; 9. Air pump. Detailed Implementation

[0025] Preferred embodiments of the present invention will now be described with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are merely illustrative of the technical principles of the present invention and are not intended to limit the scope of protection of the present invention.

[0026] Preferred embodiments of the present invention will now be described with reference to the accompanying drawings. Those skilled in the art should understand that although the steps of the control method of the present invention are described in a specific order in this application, this order is not restrictive, and those skilled in the art can perform the steps in different orders without departing from the basic principles of the present invention.

[0027] It should be noted that in the description of this invention, terms such as "inner," "outer," "upper," and "lower," which indicate direction or positional relationships, are based on the direction or positional relationships shown in the accompanying drawings. These are used merely for ease of description and do not indicate or imply that the device or element must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention. Furthermore, the terms "first," "second," "third," "fourth," and "fifth" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0028] Furthermore, it should be noted that, in the description of this invention, unless otherwise explicitly specified and limited, the terms "set," "connect," and "install" should be interpreted broadly, for example, referring to a fixed connection, a detachable connection, or an integral connection. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0029] Based on the background technology, existing water purification equipment suffers from high TDS (Total Dissolved Solids) in the first cup of water after water purification and standby mode. This invention provides a control method and equipment for a water purification system. By setting up a return pipeline, a first air inlet pipeline, a second air inlet pipeline, and an air pump, the system enables pure water to return. Through four steps—rinsing the reverse osmosis filter with water from the pre-filter and pure water, circulating pure water filtration, discharging wastewater from the reverse osmosis filter via the air pump, and replenishing water to the reverse osmosis filter via the water pump—the system significantly reduces the TDS value of both wastewater and pure water in the reverse osmosis filter. This ensures the purity and taste of the pure water produced by the reverse osmosis filter in standby mode, improving the user experience.

[0030] Specifically, such as Figure 1As shown, the present invention provides a water purification device, including a reverse osmosis filter 1, a water pump 2, an air pump 9, and a return pipeline 3. The reverse osmosis filter 1 has a raw water inlet, a pure water outlet, and a wastewater outlet. The pure water outlet is connected to the outlet of the water purification device through a first pipeline 41, and the wastewater outlet discharges wastewater through a second pipeline 42. The outlet of the water pump 2 is connected to the raw water inlet through a third pipeline 43, and the inlet of the water pump 2 is connected to a water source through a fourth pipeline 44. A wastewater control valve 51 is provided on the second pipeline 42, and an inlet control valve is provided on the fourth pipeline 44. The two ends of the return pipeline 3 are connected to the first pipeline 41 and the fourth pipeline 44, respectively. The connection point between the return pipeline 3 and the fourth pipeline 44 is located between the inlet control valve and the inlet of the water pump 2. A return control valve 53 is provided on the return pipeline 3. The water purification device also includes a first air inlet pipeline 45, a second air inlet pipeline 46, and a valve provided on the first air inlet pipeline 45. The valve is a first... One-way valve 61 or air intake control valve, the first one-way valve 61 is open from the first end of the first air intake pipe 45 toward the second end, the first end of the first air intake pipe 45 is connected to the external environment, the second end of the first air intake pipe 45 is connected to the first pipe 41 and the connection point is located between the connection point of the return pipe 3 and the first pipe 41 and the pure water outlet, or the second end of the first air intake pipe 45 is connected to the return pipe 3 and the connection point is located between the connection point of the return pipe 3 and the first pipe 41 and the return control valve 53, the first end of the second air intake pipe 46 is connected to the external environment, the second end of the second air intake pipe 46 is connected to the first pipe 41, the return pipe 3, the third pipe 43 or the fourth pipe 44, in the case where the second air intake pipe 46 is connected to the fourth pipe 44, the connection point of the second air intake pipe 46 and the fourth pipe 44 is located between the water intake control valve and the water pump 2, and the air pump 9 is installed on the second air intake pipe 46.

[0031] Preferably, such as Figure 1 As shown, the water purification equipment of the present invention also includes a pre-filter device 7, which is disposed on the fourth pipeline 44. The water inlet control valve includes a first control valve 54 and a second control valve 52. The first control valve 54 is located downstream of the second control valve 52 along the water flow direction. The pre-filter device 7 is disposed between the first control valve 54 and the second control valve 52.

[0032] Preferably, such as Figure 1 As shown, the water purification equipment of the present invention also includes a post-filter device 8, which is disposed on the first pipeline 41 and located between the connection point of the return pipeline 3 and the first pipeline 41 and the pure water outlet. When the first air inlet pipeline 45 is connected to the first pipeline 41, the connection point of the first air inlet pipeline 45 and the first pipeline 41 is located between the post-filter device 8 and the pure water outlet.

[0033] Preferably, such as Figure 1As shown, the water purification device of the present invention also includes a second one-way valve 62 disposed on the second air inlet pipe 46, the second one-way valve 62 being open along the direction from the first end of the second air inlet pipe 46 toward the second end.

[0034] For example, such as Figure 1 As shown, the water purification equipment of the present invention includes a reverse osmosis filter 1, a water pump 2, a pre-filter 7, and a post-filter 8. The pre-filter 7, water pump 2, reverse osmosis filter 1, and post-filter 8 are connected sequentially along the water flow direction. The water pump 2 is a booster pump. The two ends of the return pipe 3 are connected to the first pipe 41 and the fourth pipe 44, respectively. The second end of the first air inlet pipe 45 is connected to the first pipe 41. The second air inlet pipe 46 is connected to the third pipe 43. The pre-filter 7 is installed on the fourth pipe 44. The pre-filter 7 is located between the first control valve 54 and the second control valve 52. The post-filter 8 is located between the connection point of the return pipe 3 and the first pipe 41 and the connection point of the first air intake pipe 45 and the first pipe 41. The first air intake pipe 45 is equipped with a first one-way valve 61, and the second air intake pipe 46 is equipped with a second one-way valve 62. The first control valve 54 can disconnect the pre-filter 7 from the subsequent pipe. The air pump 9 is installed on the second air intake pipe 46 and can fill the second air intake pipe 46 with air.

[0035] It should be noted that when the water source is tap water, the tap water has water pressure, and a third one-way valve 63 needs to be installed on the return pipe 3. The third one-way valve 63 can only allow pure water to flow from the first pipe 41 to the fourth pipe 44, thereby preventing raw water from entering the first pipe 41 through the return pipe 3 and contaminating the pure water.

[0036] It should also be noted that the second end of the first air inlet pipe 45 can be connected to the return pipe 3, but the present invention preferably connects the second end of the first air inlet pipe 45 to the first pipe 41. This arrangement can provide more water to flush the wastewater of the reverse osmosis filter device 1.

[0037] It should also be noted that the second end of the second air inlet pipe 46 can be connected to the first pipe 41, the return pipe 3 or the fourth pipe 44. However, the present invention preferably connects the second end of the second air inlet pipe 46 to the third pipe 43. This arrangement can avoid wasting water in the water purification equipment.

[0038] It should also be noted that the valve in this invention can also be configured as an intake control valve, which can control the opening and closing of the first intake pipe 45.

[0039] It should also be noted that the wastewater control valve 51, the inlet control valve, and the return control valve 53 of the present invention can be configured as solenoid valves or shut-off valves, etc., and those skilled in the art can configure them according to their needs.

[0040] In this invention, the first control valve 54 is preferably configured as a shut-off valve, and the second control valve 52 is configured as a solenoid valve.

[0041] It should also be noted that air pump 9 can be a diaphragm air pump with a one-way valve, so that air cannot enter the second air intake pipe 46 through air pump 9 when air pump 9 is closed. Alternatively, air pump 9 can also be a regular air pump, such as... Figure 1 As shown, the present invention preferably provides a second one-way valve 62 on the second air intake pipe 46. The second one-way valve 62 is unidirectional, allowing air to enter the third pipe 43 only from the second air intake pipe 46. Such flexible adjustment and change do not deviate from the principle and scope of the present invention and should be limited to the protection scope of the present invention.

[0042] On the other hand, based on the water purification equipment described above, the present invention also provides a control method for the water purification equipment, such as... Figure 2 As shown, the control method of the present invention includes the following steps: S100: After the water purification equipment has finished producing water, obtain the standby time of the water purification equipment.

[0043] For example, after the water purification equipment of the present invention completes water purification, it enters a standby state. In the standby state, a stable concentration difference is formed on both sides of the RO membrane. The wastewater side accumulates a large amount of high-concentration salt and impurities, and the TDS value is much higher than that of the pure water side. Based on the principle of osmosis, the high-concentration water molecules on the wastewater side will slowly permeate and diffuse through the RO membrane to the pure water side, causing the salt content and impurity content of the originally clean pure water to gradually increase. Ultimately, this leads to a significant increase in the TDS value of the pure water retained inside the RO membrane. For example, after the water purification equipment completes water purification, the TDS value of the pure water is 40 ppm, but the TDS value of the wastewater is as high as 1200 ppm. The strong osmotic pressure will cause the TDS value of the pure water to increase. When the user takes the water, the TDS value of the first cup will be very high, resulting in a poor taste and affecting the user's drinking experience and health. The water purification equipment can continuously acquire the standby time and transmit it to the controller.

[0044] S200: When the standby time reaches the first preset time, open the wastewater control valve 51, the inlet control valve and the return control valve 53 and start the water pump 2.

[0045] In other words, after water purification is completed, it is first determined whether the preset start-up conditions are met. When the preset start-up conditions are met, the wastewater control valve 51, the inlet control valve, and the return control valve 53 are opened, and the water pump 2 is started. The specific steps for determining the preset start-up conditions can be as described above: obtaining the standby time of the water purification equipment and determining whether the standby time has reached the first preset time. When the standby time reaches the first preset time, it is determined that the preset start-up conditions are met. Alternatively, step S100 can be set to obtain the TDS value of the pure water from the reverse osmosis filter 1, compare the TDS value of the pure water with the preset value, and when the TDS value of the pure water is greater than the preset value, it indicates that the TDS value of the pure water is high, which will lead to a high TDS value in the first cup of water, making it unsuitable for drinking. Therefore, it is determined that the preset start-up conditions are met. Alternatively, step S100 can be set to obtain the TDS values ​​of pure water and raw water, calculate the desalination rate of the pure water, and when the desalination rate is greater than the preset value, it is determined that the preset start-up conditions are met, etc., where the desalination rate = (raw water TDS value - pure water TDS value) / raw water TDS value.

[0046] For example, before leaving the factory, the water purification equipment of the present invention will undergo a large number of tests to record the TDS value of pure water after the water purification equipment has completed water purification and at different standby times. As the standby time of the water purification equipment increases, the TDS value of pure water will also increase. When the TDS value of pure water rises to a preset value, the pure water tastes bad and is no longer suitable for drinking. The standby time of the water purification equipment is recorded and this standby time is used as the first preset time of the water purification equipment.

[0047] It should be noted that the water purification device of the present invention can also calculate the desalination rate of pure water in standby mode to determine the first preset time, wherein the desalination rate = (raw water TDS value - pure water TDS value) / raw water TDS value.

[0048] When the standby time reaches the first preset time, taking a standby time of 5 minutes (the first preset time varies for different models, please refer to the actual product), it is determined that the TDS value of the pure water is too high and is no longer suitable for drinking. At this time, the wastewater control valve 51, the second control valve 52, the first control valve 54 and the return control valve 53 are opened and the water pump 2 is started. The negative pressure generated by the water pump 2 can make the pure water from the pure water outlet and the water in the post-filter device 8 flow back to the fourth pipe 44 along the return pipe 3 and merge with the water in the pre-filter device 7. The TDS value of the merged water will decrease. The merged water enters the reverse osmosis filter device 1 for rinsing. The TDS value of the water on the pure water side of the reverse osmosis filter device 1 will continue to decrease. The wastewater side of the reverse osmosis filter device 1 will be discharged through the second pipe 42. The TDS value of the wastewater will continue to decrease and tend to stabilize.

[0049] It should be noted that the present invention does not limit the value of the first preset time. For example, those skilled in the art can set the first preset time to 2 minutes or 4 minutes, etc., as long as it is reasonably set according to the specific model. Such adjustment and change of the specific value of the first preset time does not deviate from the principle and scope of the present invention and should be limited to the protection scope of the present invention.

[0050] S300: Determine whether the first preset condition has been met, and if the first preset condition has been met, close the wastewater control valve 51 and the inlet control valve, and allow the water pump 2 to continue running.

[0051] For example, when the water purification device of the present invention reaches the first preset condition, the TDS value of the reverse osmosis filter 1 is stabilized by mixing pure water and water from the pre-filter 7 to rinse the reverse osmosis filter 1. However, the TDS value of the water on the wastewater side of the reverse osmosis filter 1 is still high, and the wastewater will still pollute the pure water through osmosis. At this time, by closing the wastewater control valve 51 and the first control valve 54 (wherein the second control valve 52 may be closed or not), and keeping the water pump 2 running, the water on the pure water side of the reverse osmosis filter 1 is circulated and filtered between the post-filter 8, the return pipe 3, the water pump 2, and the reverse osmosis filter 1, thereby significantly reducing the TDS value of the water on the pure water side of the reverse osmosis filter 1.

[0052] It should be noted that during the pure water circulation filtration stage, the post-filter 8 can be used as a water storage tank, and the post-filter 8 can store a large amount of pure water with very low TDS values.

[0053] Preferably, the steps of "closing the wastewater control valve 51 and the inlet control valve" of the present invention are as follows: first, close the wastewater control valve 51, and then close the inlet control valve after a fourth preset time.

[0054] For example, the water purification device of the present invention first closes the wastewater control valve 51, and then closes the inlet control valve after 10 seconds. Closing the inlet control valve afterward replenishes the water purification device with water, preventing insufficient water in the device and affecting its operation.

[0055] It should be noted that the present invention does not limit the value of the fourth preset time. For example, those skilled in the art can set the fourth preset time to 18s or 15s, etc. Such adjustments and changes to the specific value of the fourth preset time do not deviate from the principle and scope of the present invention and should be limited to the protection scope of the present invention.

[0056] S400: Determine whether the second preset condition has been met, and if the second preset condition has been met, open the wastewater control valve 51 again to stop the water pump 2 and start the air pump 9.

[0057] For example, when the water purification equipment of the present invention reaches the second preset condition, the TDS values ​​of the water on the pure water side of the reverse osmosis filter 1 and the water of the post-filter 8 are very low and tend to be stable. At this time, the wastewater control valve 51 is opened again, the water pump 2 is stopped and the air pump 9 is started. The air pump 9 can make air enter the third pipe 43 through the second air inlet pipe 46, thereby discharging the wastewater in the reverse osmosis filter 1.

[0058] It should be noted that when the second preset condition is met, the wastewater control valve 51 is opened again to stop the water pump 2 and start the air pump 9. The return control valve 53 may or may not be closed. The present invention preferably closes the return control valve 53 so that the water in the post-filter device 8 is not affected when the air pump 9 is turned on.

[0059] S500: After all the wastewater from the reverse osmosis filter 1 is discharged, the air pump 9 is stopped and the water pump 2 is started to replenish water to the reverse osmosis filter 1.

[0060] For example, after all the wastewater in the reverse osmosis filter 1 of the present invention is discharged, the reverse osmosis filter 1 is short of water. At this time, the air pump 9 is stopped and the water pump 2 is started. The water pump 2 can extract the water in the post-filter 8 and replenish the reverse osmosis filter 1 through the return pipe 3. The TDS value of the wastewater in the reverse osmosis filter 1 after replenishment is very low and close to the TDS value of pure water. The pollution of pure water by the wastewater through osmosis will be greatly reduced.

[0061] It should be noted that when the air pump 9 is stopped and the water pump 2 is started, if the valve is an air intake control valve, the air intake control valve needs to be opened.

[0062] It should also be noted that if the reflux control valve 53 is closed in the previous stage, it needs to be opened again in this stage.

[0063] S600: After the reverse osmosis filter unit 1 has finished replenishing water, close the wastewater control valve 51 and the return flow control valve 53, and stop the water pump 2.

[0064] For example, after the reverse osmosis filtration device 1 of the present invention is replenished with water, the wastewater control valve 51 and the return flow control valve 53 are closed, and the water pump 2 is stopped, so that the water purification equipment enters the standby state. In the standby state, the pollution of the water on the wastewater side of the reverse osmosis filtration device 1 to the pure water side of the reverse osmosis filtration device 1 can be greatly reduced through osmosis, so that the pure water can maintain a low TDS value for a long time, ensuring the purity and taste of the pure water and improving the user experience.

[0065] It should be noted that the present invention does not limit the judgment criteria for the first and second preset conditions. For example, those skilled in the art can use the running time of the water pump 2 as the judgment criterion, or the TDS value of the water in the water purification device as the judgment criterion, or a combination of the above two as the judgment criterion, etc. For example, when the TDS value of the water in the water purification device is used as the judgment criterion, one or more of the TDS values ​​of pure water, wastewater, raw water, water in the pipeline, or water in the post-filter device 8 can be used as the judgment basis. Such adjustments and changes to the specific judgment criteria of the first and second preset conditions do not deviate from the principle and scope of the present invention and should all be limited to the protection scope of the present invention.

[0066] It should also be noted that when the water pump 2 is stopped, if the valve is an air intake control valve, the air intake control valve needs to be closed.

[0067] In the first preferred case, Taking the running time of water pump 2 as an example, For example, such as Figure 3 As shown, step S300 includes steps S310 to S330.

[0068] S310: Obtain the running time of water pump 2.

[0069] For example, after the water purification equipment of the present invention has completed water production and has been in standby for 5 minutes, it opens the wastewater control valve 51, the second control valve 52, the first control valve 54 and the return flow control valve 53 and starts the water pump 2, continuously acquires the running time of the water pump 2 and transmits the running time to the controller.

[0070] S320: Determine whether the running time of water pump 2 has reached the second preset time.

[0071] For example, the controller of the water purification device of the present invention is provided with a second preset time. The controller can compare the obtained running time of the water pump 2 with the second preset time and perform the next control step according to the comparison result.

[0072] S330: When the running time of water pump 2 reaches the second preset time, close the wastewater control valve 51 and the inlet control valve.

[0073] For example, when the water pump 2 of the present invention runs for a second preset time, taking 5 minutes as an example, the water pump 2 runs for 5 minutes with the wastewater control valve 51, the second control valve 52, the first control valve 54 and the return control valve 53 open. During the 5 minutes, the water from the pre-filter device 7 and the pure water return water mix and rinse the reverse osmosis filter device 1. When the time reaches 5 minutes, the TDS value of the wastewater discharged from the wastewater outlet tends to stabilize. If rinsing is performed again, the change in the TDS value of the wastewater discharged from the wastewater outlet will not have a significant impact. At this time, it is determined that the first preset condition has been met, and the wastewater control valve 51, the second control valve 52 and the first control valve 54 are closed to allow pure water to circulate and filter.

[0074] For example, such as Figure 3 As shown, step S400 includes steps S410 to S430.

[0075] S410: Obtain the running time of water pump 2.

[0076] For example, after closing the wastewater control valve 51 and the second control valve 52 and the first control valve 54, the water purification equipment of the present invention continuously acquires the running time of the water pump 2 and transmits the running time to the controller.

[0077] S420: Determine whether the running time of water pump 2 has reached the third preset time.

[0078] For example, the controller of the water purification device of the present invention is provided with a third preset time. The controller can compare the obtained running time of the water pump 2 with the third preset time and perform the next control step according to the comparison result.

[0079] S430: When the running time of water pump 2 reaches the third preset time, the wastewater control valve 51 is opened again to stop water pump 2 and start air pump 9.

[0080] For example, the water pump 2 of the water purification equipment of the present invention runs for a third preset time. Taking the third preset time as 11 minutes as an example, that is, the water pump 2 runs for 5 minutes with the wastewater control valve 51, the second control valve 52, the first control valve 54 and the return control valve 53 open. Then the water pump 2 runs for another 6 minutes with the wastewater control valve 51, the second control valve 52 and the first control valve 54 closed. During the 6 minutes, pure water is circulated and filtered, and the TDS value of the water between the reverse osmosis filter device 1 and the water pump 2 tends to stabilize. Pure water is then circulated and filtered again, and the TDS value of the water does not change much. At this time, it is determined that the second preset condition has been met, and the wastewater control valve 51 is opened again to stop the water pump 2 and start the air pump 9.

[0081] It should be noted that the present invention does not limit the values ​​of the second preset time and the third preset time. For example, those skilled in the art can set the second preset time to 4 minutes or 6 minutes, and the third preset time to 4 minutes or 5 minutes, etc., as long as they are reasonably set according to the actual product and test data. Such adjustments and changes to the specific values ​​of the second preset time and the third preset time do not deviate from the principles and scope of the present invention and should be limited to the protection scope of the present invention.

[0082] In the second preferred scenario, Taking the TDS value of the water in the water purification equipment as an example, For example, such as Figure 4 As shown, step S300 includes steps S310 to S350.

[0083] S310: Obtain the TDS value of the wastewater discharged from the wastewater outlet, and record it as the first TDS value T1.

[0084] For example, the water purification equipment of the present invention is equipped with a TDS detection device. After the wastewater control valve 51, the second control valve 52, the first control valve 54 and the return control valve 53 are opened and the water pump 2 is started, the TDS detection device can detect the TDS value of the wastewater discharged from the wastewater outlet and transmit the detection result to the controller.

[0085] S320: Obtain the TDS value of the raw water, denoted as the second TDS value T2.

[0086] For example, the TDS detection device of the water purification equipment of the present invention can also detect the TDS value of the raw water and transmit the detection result to the controller.

[0087] S330: Calculate the difference △T between the first TDS value T1 and the second TDS value T2, where △T = T1 - T2.

[0088] For example, the first TDS value T1 detected by the water purification device of the present invention is 550 ppm, the second TDS value T2 is 400 ppm, and ΔT=T1-T2=550-400=150 ppm.

[0089] S340: Compare the difference △T with the preset difference △Ty.

[0090] For example, the water purification device of the present invention can directly compare the difference △T with the preset difference △Ty, or it can calculate the ratio between the two, etc.

[0091] S350: If the difference △T is less than the preset difference △Ty, then close the wastewater control valve 51 and the inlet control valve.

[0092] For example, the preset difference ΔTy of the water purification device of the present invention is 180ppm, the difference ΔT is 150ppm, and ΔT < ΔTy, indicating that the TDS value of the wastewater discharged from the wastewater outlet has become stable and is relatively close to the TDS value of the raw water. The purification and filtration capacity of the reverse osmosis filter device 1 has reached its limit. Even if it is rinsed again, the TDS value of the wastewater discharged from the wastewater outlet will not decrease significantly. At this time, the wastewater control valve 51, the second control valve 52 and the first control valve 54 are closed to allow the pure water to be circulated back for filtration in order to reduce the TDS value of the pure water.

[0093] For example, such as Figure 4 As shown, step S400 includes steps S410 to S430.

[0094] S410: Obtain the TDS value of the water between the reverse osmosis filter 1 and the water pump 2, and record it as the third TDS value T3.

[0095] For example, the TDS detection device of the water purification equipment of the present invention can also detect the TDS value of the water between the reverse osmosis filter device 1 and the water pump 2, and transmit the detection result to the controller.

[0096] S420: Compare the third TDS value T3 with the first preset value Ty1.

[0097] For example, the water purification device of the present invention can directly compare the third TDS value T3 with the first preset value Ty1, or it can calculate the difference between the two, etc.

[0098] S430: If T3 < Ty1, then open the wastewater control valve 51 again to stop the water pump 2 and start the air pump 9.

[0099] For example, the third TDS value T3 of the water purification device of the present invention is 150 ppm when the wastewater control valve 51 and the inlet control valve are just closed. After a period of pure water reflux circulation filtration, the third TDS value T3 is detected to be 50 ppm, the first preset value Ty1 is 60 ppm, and T3 < Ty1. This indicates that through pure water reflux circulation filtration, the TDS value of the water in the pipeline before the reverse osmosis filter device 1, as well as the return pipeline 3, the first pipeline 41 and the post-filter device 8, is already very low and stable. The TDS value of the pure water is also very low and will not decrease significantly. However, the TDS value of the wastewater is very high. At this time, the wastewater control valve 51 is closed and then reopened, causing the water pump 2 to stop running and the air pump 9 to start running. The wastewater of the reverse osmosis filter device 1 is discharged through the air pump 9.

[0100] It should be noted that the present invention does not limit the values ​​of the preset difference △Ty and the first preset value Ty1. For example, those skilled in the art can set the preset difference △Ty to 160ppm or 170ppm, etc., and the first preset value Ty1 to 50ppm or 70ppm, etc., as long as they are reasonably set according to the actual product and test data. Such adjustment and change of the specific values ​​of the preset difference △Ty and the first preset value Ty1 does not deviate from the principle and scope of the present invention, and should be limited to the protection scope of the present invention.

[0101] It should also be noted that although the present invention has described in detail the two embodiments based on the running time of the water pump 2 and the TDS value of the water in the water purification device as the judgment criteria, those skilled in the art can also use the two judgment criteria in combination. For example, when judging whether the first preset condition has been met, the running time of the water pump 2 or the TDS value of the water in the water purification device can be used as the judgment criteria; when judging whether the second preset condition has been met, the running time of the water pump 2 or the TDS value of the water in the water purification device can be used as the judgment criteria, and so on. Those skilled in the art can set them reasonably according to actual product needs. Such flexible adjustments and changes do not deviate from the principles and scope of the present invention and should be limited to the protection scope of the present invention.

[0102] Preferably, the water purification device of the present invention further includes a controller, which is capable of controlling the water purification device to perform any of the control methods described above.

[0103] Those skilled in the art will understand that although some embodiments described herein include certain features included in other embodiments but not others, combinations of features from different embodiments are intended to be within the scope of this application and form different embodiments. For example, any of the claimed embodiments in the claims of this application can be used in any combination.

[0104] The technical solution of the present invention has been described above with reference to the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the scope of protection of the present invention is obviously not limited to these specific embodiments. Without departing from the principles of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after such changes or substitutions will all fall within the scope of protection of the present invention.

Claims

1. A control method for a water purification device, characterized in that, The water purification equipment includes a reverse osmosis filter (1), a water pump (2), an air pump (9), and a return pipeline (3). The reverse osmosis filter (1) has a raw water inlet, a pure water outlet, and a wastewater outlet. The pure water outlet is connected to the outlet of the water purification equipment through a first pipeline (41). The wastewater outlet discharges wastewater through a second pipeline (42). The outlet of the water pump (2) is connected to the raw water inlet through a third pipeline (43). The inlet of the water pump (2) is connected to the raw water inlet through a fourth pipeline. The pipeline (44) is connected to the water source. The second pipeline (42) is equipped with a wastewater control valve (51). The fourth pipeline (44) is equipped with an inlet control valve. The two ends of the return pipeline (3) are connected to the first pipeline (41) and the fourth pipeline (44) respectively. The connection point between the return pipeline (3) and the fourth pipeline (44) is located between the inlet control valve and the inlet end of the water pump (2). The return pipeline (3) is equipped with a return control valve (53). The water purification equipment also includes a first air inlet pipe (45), a second air inlet pipe (46), and a valve installed on the first air inlet pipe (45). The valve is a first one-way valve (61) or an air inlet control valve. The first one-way valve (61) is open from the first end of the first air inlet pipe (45) toward the second end. The first end of the first air inlet pipe (45) is connected to the external environment. The second end of the first air inlet pipe (45) is connected to the first pipe (41), and the connection point is located between the connection point of the return pipe (3) and the first pipe (41) and the pure water outlet. Alternatively, the second end of the first air inlet pipe (45) is connected to the return pipe (3), and the connection point is located between the connection point of the return pipe (3) and the pure water outlet. Located between the connection point of the return pipeline (3) and the first pipeline (41) and the return control valve (53), the first end of the second air intake pipeline (46) is connected to the external environment, and the second end of the second air intake pipeline (46) is connected to the first pipeline (41), the return pipeline (3), the third pipeline (43), or the fourth pipeline (44). In the case where the second air intake pipeline (46) is connected to the fourth pipeline (44), the connection point of the second air intake pipeline (46) and the fourth pipeline (44) is located between the water inlet control valve and the water pump (2). The air pump (9) is installed on the second air intake pipeline (46). The control method includes: After the water purification equipment completes water production, it is determined whether the preset start-up conditions are met. When the preset start-up conditions are met, the wastewater control valve (51), the inlet control valve, and the return flow control valve (53) are opened, and the water pump (2) is started and running. Determine whether the first preset condition has been met, and when the first preset condition has been met, close the wastewater control valve (51) and the inlet control valve, and allow the water pump (2) to continue running. The first preset condition includes the running time of the water pump (2) or the TDS value of the water in the water purification equipment. Determine whether the second preset condition has been met, and when the second preset condition is met, open the wastewater control valve (51) again to stop the water pump (2) and start the air pump (9) to discharge the wastewater from the reverse osmosis filter (1). The second preset condition includes the running time of the water pump (2) or the TDS value of the water in the water purification equipment. After all the wastewater from the reverse osmosis filter (1) is discharged, the air pump (9) is stopped and the water pump (2) is started to replenish water to the reverse osmosis filter (1). In the case where the valve is the air intake control valve, the air intake control valve is opened. After the reverse osmosis filter (1) is replenished with water, the wastewater control valve (51) and the return flow control valve (53) are closed, and the water pump (2) is stopped. In the case where the valve is the air intake control valve, the air intake control valve is closed.

2. The control method for the water purification equipment according to claim 1, characterized in that, The steps of "determining whether the first preset condition has been met, and closing the wastewater control valve (51) and the inlet control valve when the first preset condition is met" specifically include: Obtain the operating time of the water pump (2); Determine whether the running time of the water pump (2) has reached the second preset time; When the water pump (2) has been running for the second preset time, the wastewater control valve (51) and the water inlet control valve are closed.

3. The control method for the water purification equipment according to claim 1, characterized in that, The steps of "determining whether the first preset condition has been met, and closing the wastewater control valve (51) and the inlet control valve when the first preset condition is met" specifically include: Obtain the TDS value of the wastewater discharged from the wastewater outlet, and record it as the first TDS value T1; Obtain the TDS value of the raw water and denote it as the second TDS value T2; Based on the first TDS value T1 and the second TDS value T2, determine whether to close the wastewater control valve (51) and the inlet control valve.

4. The control method for the water purification equipment according to claim 3, characterized in that, The step of "determining whether to close the wastewater control valve (51) and the inlet control valve based on the first TDS value T1 and the second TDS value T2" ​​specifically includes: Calculate the difference ΔT between the first TDS value T1 and the second TDS value T2, where ΔT = T1 - T2; Compare the difference △T with the preset difference △Ty; If the difference △T is less than the preset difference △Ty, then the wastewater control valve (51) and the inlet control valve are closed.

5. The control method for the water purification equipment according to claim 1, characterized in that, The judgment steps of "determining whether the second preset condition has been met, and when the second preset condition is met, opening the wastewater control valve (51) again to stop the water pump (2) and start the air pump (9)" specifically include: Obtain the TDS value of the water between the reverse osmosis filter device (1) and the water pump (2), and record it as the third TDS value T3; Compare the third TDS value T3 with the first preset value Ty1; If T3 < Ty1, then the wastewater control valve (51) is opened again, causing the water pump (2) to stop running and the air pump (9) to start running.

6. The control method for the water purification equipment according to claim 1, characterized in that, The judgment steps of "determining whether the second preset condition has been met, and when the second preset condition is met, opening the wastewater control valve (51) again to stop the water pump (2) and start the air pump (9)" specifically include: Obtain the operating time of the water pump (2); Determine whether the running time of the water pump (2) has reached the third preset time; When the water pump (2) has been running for the third preset time, the wastewater control valve (51) is opened again to stop the water pump (2) and start the air pump (9).

7. The control method for the water purification equipment according to claim 1, characterized in that, The water purification equipment also includes a pre-filter (7), which is installed on the fourth pipeline (44). The inlet control valve includes a first control valve (54) and a second control valve (52). The first control valve (54) is located downstream of the second control valve (52) along the water flow direction. The pre-filter (7) is installed between the first control valve (54) and the second control valve (52). The steps of "when the preset start-up conditions are met, opening the wastewater control valve (51), the inlet control valve, and the return control valve (53) and starting the water pump (2)" specifically include: Open the wastewater control valve (51), the first control valve (54), the second control valve (52) and the return control valve (53) and start the water pump (2); The steps of "determining whether the first preset condition has been met, and when the first preset condition is met, closing the wastewater control valve (51) and the inlet control valve, and allowing the water pump (2) to continue running" specifically include: Close the wastewater control valve (51) and the first control valve (54), and keep the water pump (2) running; and / or The water purification equipment further includes a post-filter (8), which is installed on the first pipeline (41) and located between the connection point of the return pipeline (3) and the first pipeline (41) and the pure water outlet. When the first air inlet pipeline (45) is connected to the first pipeline (41), the connection point of the first air inlet pipeline (45) and the first pipeline (41) is located between the post-filter (8) and the pure water outlet; and / or The water purification equipment also includes a second one-way valve (62) installed on the second air inlet pipe (46), the second one-way valve (62) being open along the direction from the first end of the second air inlet pipe (46) toward the second end.

8. The control method for the water purification equipment according to any one of claims 1 to 7, characterized in that, The steps of "closing the wastewater control valve (51) and the inlet control valve" specifically include: First, close the wastewater control valve (51), and then close the inlet control valve after a fourth preset time; and / or The steps for "determining whether the preset startup conditions are met" specifically include: Obtain the standby time of the water purification device; Determine whether the standby time has reached the first preset time; When the standby time reaches the first preset time, it is determined that the preset startup condition is met.

9. A water purification device, characterized in that, The water purification device includes a controller configured to perform the control method according to any one of claims 1 to 8.

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