Control methods for water purification equipment and water purification equipment

Abstract

This invention relates to the field of water purification equipment technology, specifically providing a control method and a water purification device. The water purification device of this invention includes a reverse osmosis filter, a water pump, and a return pipeline. The reverse osmosis filter has a raw water inlet, a pure water outlet, and a wastewater outlet. A wastewater control valve is installed on a second pipeline, and an inlet control valve is installed on a fourth pipeline. The two ends of the return pipeline are connected to the pure water outlet and the inlet of the water pump, respectively. A return control valve is installed on the return pipeline. The control method includes: when preset start-up conditions are met, opening the wastewater control valve, the inlet control valve, and the return control valve to start the water pump; when a first preset condition is met, closing the wastewater control valve and the inlet control valve; and when a second preset condition is met, reopening the wastewater control valve and the inlet control valve. By setting up a return pipeline and using pure water return to flush the reverse osmosis filter multiple times, the TDS value of the pure water can be reduced, improving the user experience.

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 including a reverse osmosis filter, a water 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 through a first pipeline, the wastewater outlet discharges wastewater through a second pipeline, the outlet of the water pump is connected to the raw water inlet through a third pipeline, and the inlet of the water pump is connected to a water source through 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 pure water outlet and the inlet of the water pump, and a return pipeline control valve is provided on the return pipeline. The control method includes: after the water purification device 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 inlet control valve, and the return pipeline control valve. The system operates by: 1) activating the backflow control valve and starting the water pump; 2) determining whether a first preset condition has been met, and if so, closing the wastewater control valve and the inlet control valve, and allowing the water pump to continue running, wherein the first preset condition includes the pump's running time or the TDS value of the water in the water purification equipment; 3) determining whether a second preset condition has been met, and if so, reopening the wastewater control valve and the inlet control valve, and allowing the water pump to continue running, wherein the second preset condition includes the pump's running time or the TDS value of the water in the water purification equipment; 4) determining whether a third preset condition has been met, and if so, closing the wastewater control valve, the inlet control valve, and the backflow control valve, and stopping the water pump, wherein the third preset condition includes the pump's running time or the TDS value of the water in the water purification equipment.

[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 opening the wastewater control valve and the inlet control valve again when the second preset condition is met" specifically includes: obtaining the TDS value of the water between the reverse osmosis filter and the water pump, and recording it as the third TDS value T3; comparing the third TDS value T3 with the first preset value Ty1; if T3 < Ty1, then opening the wastewater control valve and the inlet control valve again.

[0013] 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 opening the wastewater control valve and the inlet control valve again when the second 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 the third preset time; and opening the wastewater control valve and the inlet control valve again when the running time of the water pump reaches the third preset time.

[0014] In the preferred technical solution of the control method for the above-mentioned water purification equipment, the step of "determining whether a third preset condition has been met, and when the third preset condition is met, closing the wastewater control valve, the inlet control valve, and the return flow control valve and stopping the water pump" specifically includes: obtaining the running time of the water pump; determining whether the running time of the water pump has reached a fourth preset time; and when the running time of the water pump reaches the fourth preset time, closing the wastewater control valve, the inlet control valve, and the return flow control valve and stopping the water pump.

[0015] In the preferred technical solution of the control method for the above-mentioned water purification equipment, the step of "determining whether a third preset condition is met, and when the third preset condition is met, closing the wastewater control valve, the inlet control valve, and the return flow control valve and stopping the water pump" specifically includes: obtaining the TDS value of the wastewater discharged from the wastewater outlet, denoted as the fourth TDS value T4; comparing the fourth TDS value T4 with the second preset value Ty2; if T4 < Ty2, closing the wastewater control valve, the inlet control valve, and the return flow control valve and stopping the water pump.

[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 fifth 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; 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, enables pure water to return, and through three steps—rinsing the reverse osmosis filter with raw water and pure water, circulating pure water for filtration, and rinsing the reverse osmosis filter with raw water and pure water again—it can significantly reduce the TDS value of the pure water in the reverse osmosis filter, ensuring the purity and taste of the 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 preset condition, the second preset condition, and the third preset condition 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, 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, and determines whether the third preset condition is met by using the TDS value of wastewater. 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 the water in the water purification device and ensure water pressure by first closing the wastewater control valve and then closing the inlet water control valve. 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 pipeline; 42. Second pipeline; 43. Third pipeline; 44. Fourth pipeline; 5. Wastewater control valve; 6. Inlet water control valve; 7. Reflux control valve; 8. Check valve; 9. Pre-filter device. 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 has a high TDS (Total Dissolved Solids) value in the first cup of water after water purification and standby. This invention provides a control method and a water purification device. By setting up a return pipeline, pure water can be returned. Through three steps—rinsing the reverse osmosis filter with raw water and pure water, circulating pure water filtration, and rinsing the reverse osmosis filter with raw water and pure water again—the TDS value of the pure water in the reverse osmosis filter can be significantly reduced. This ensures the purity and taste of the pure water in the standby state of the reverse osmosis filter, and improves the user experience.

[0030] Specifically, such as Figure 1 As shown, the present invention provides a water purification device, including a reverse osmosis filter 1, a water pump 2, 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 5 is provided on the second pipeline 42, and an inlet control valve 6 is provided on the fourth pipeline 44. The two ends of the return pipeline 3 are connected to the pure water outlet and the inlet of the water pump 2, respectively, and a return control valve 7 is provided on the return pipeline 3.

[0031] 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, and a pre-filter 9. The pre-filter 9, the water pump 2, and the reverse osmosis filter 1 are connected in sequence along the water flow direction. The water pump 2 is a booster pump. The pre-filter 9 is installed on the fourth pipeline 44 and is located between the water pump 2 and the inlet control valve 6. The return pipeline 3 is connected to the inlet end of the water pump 2 through the fourth pipeline 44, and the connection point is between the inlet control valve 6 and the pre-filter 9.

[0032] Water pipes contain large solid particles such as silt, rust, insect eggs, colloids, and plastic debris. The pre-filter 9 can intercept these coarse impurities in advance, preventing hard particles from scratching or clogging the RO membrane surface, preventing particles from wearing down the impeller of the water pump 2 and clogging the valve group flow channel, extending the service life of the core filter element and water circuit electrical components of the whole machine, and reducing the failure rate.

[0033] It should be noted that when the water source is tap water, the tap water has water pressure, and a one-way valve 8 needs to be installed on the return pipe 3. The one-way valve 8 can only allow pure water to flow from the pure water outlet toward the water inlet of the water pump 2, thereby preventing raw water from entering the first pipe 41 through the return pipe 3 and contaminating the pure water.

[0034] It should also be noted that the wastewater control valve 5, the inlet control valve 6, and the return control valve 7 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.

[0035] 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.

[0036] 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.

[0037] S200: When the standby time reaches the first preset time, open the wastewater control valve 5, the inlet water control valve 6 and the return flow control valve 7 and start the water pump 2.

[0038] 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 5, the inlet water control valve 6, and the return flow control valve 7 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.

[0039] 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 production and at different standby times. As the standby time of the water purification equipment increases, the TDS value of pure water will also increase under the action of osmosis. When the TDS value of pure water exceeds the 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 used as the first preset time of the water purification equipment.

[0040] 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), at this time, 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 5, the inlet water control valve 6, and the return control valve 7 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 flow back to the fourth pipe 44 along the return pipe 3 and merge with the raw water of the water source. The TDS value of the merged water will decrease. The merged water enters the reverse osmosis filter 1 for rinsing. The TDS value of the water on the pure water side of the reverse osmosis filter 1 will continue to decrease. The wastewater side of the reverse osmosis filter 1 will be discharged through the second pipe 42. The TDS value of the wastewater will continue to decrease and tend to stabilize.

[0041] 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.

[0042] S300: Determine whether the first preset condition has been met, and if the first preset condition has been met, close the wastewater control valve 5 and the inlet control valve 6, and allow the water pump 2 to continue running.

[0043] For example, when the water purification equipment of the present invention reaches the first preset condition, the TDS value of the water on the wastewater side of the reverse osmosis filter 1 will tend to stabilize by rinsing the reverse osmosis filter 1 with pure water and raw water. 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 5 and the inlet control valve 6 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 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.

[0044] It should be noted that during the pure water circulation filtration stage, the pre-filter 9 can be used as a water storage tank, and the pre-filter 9 can store a large amount of pure water with very low TDS values.

[0045] Preferably, the steps of "closing the wastewater control valve 5 and the inlet control valve 6" of the present invention are as follows: first, close the wastewater control valve 5, and then close the inlet control valve 6 after a fifth preset time.

[0046] For example, the water purification device of the present invention first closes the wastewater control valve 5, and then closes the inlet water control valve 6 after 10 seconds. Closing the inlet water control valve 6 afterwards can replenish water to the water purification device, preventing insufficient water in the water purification device from affecting its operation.

[0047] It should be noted that the present invention does not limit the value of the fifth preset time. For example, those skilled in the art can set the fifth preset time to 12s or 15s, etc. Such adjustments and changes to the specific value of the fifth 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.

[0048] S400: Determine whether the second preset condition has been met, and if the second preset condition has been met, reopen the wastewater control valve 5 and the inlet water control valve 6, and keep the water pump 2 running.

[0049] For example, when the water purification equipment of the present invention reaches the second preset condition, the TDS value of the water on the pure water side of the reverse osmosis filter 1 and the TDS value of the water between the reverse osmosis filter 1 and the pre-filter 9 are very low and tend to be stable. However, the TDS value of the water on the wastewater side of the reverse osmosis filter 1 is very high. At this time, the wastewater control valve 5 and the inlet control valve 6 are opened again, and the water pump 2 continues to run. The negative pressure generated by the water pump 2 can make the TDS value of the pure water outlet very low. The pure water flows back to the fourth pipe 44 along the return pipe 3 and merges with the raw water of the water source. The TDS value of the merged water will be lower. The merged water enters the reverse osmosis filter 1 for rinsing. The TDS value of the water on the pure water side of the reverse osmosis filter 1 will continue to decrease, and the TDS value of the water on the wastewater side of the reverse osmosis filter 1 will also continue to decrease.

[0050] S500: Determine whether the third preset condition has been met, and if the third preset condition is met, close the wastewater control valve 5, the inlet control valve 6 and the return control valve 7 and stop the water pump 2 from running.

[0051] For example, when the water purification equipment of the present invention reaches the third preset condition, the TDS value of the water on the wastewater side of the reverse osmosis filter 1 is very low and tends to be stable, and is close to the TDS value of the combined water. At this time, the wastewater control valve 5, the inlet control valve 6 and the return control valve 7 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 filter 1 to the pure water side of the reverse osmosis filter 1 can be greatly reduced through osmosis. The reduced osmosis has little impact on the TDS value of the pure water of the water purification equipment, ensuring the purity and taste of the pure water and improving the user experience.

[0052] It should be noted that the present invention does not limit the judgment criteria for the first, second, and third 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 equipment 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 equipment 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 pre-filter 9 can be used as the judgment basis. Such adjustments and changes to the specific judgment criteria of the first, second, and third preset conditions do not deviate from the principles and scope of the present invention and should all be limited to the protection scope of the present invention.

[0053] 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.

[0054] S310: Obtain the running time of water pump 2.

[0055] 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 5, the inlet water control valve 6, and the return flow control valve 7 and starts the water pump 2, continuously acquires the running time of the water pump 2, and transmits the running time to the controller.

[0056] S320: Determine whether the running time of water pump 2 has reached the second preset time.

[0057] For example, the controller of the water purification device of the present invention has 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.

[0058] S330: When the running time of water pump 2 reaches the second preset time, close wastewater control valve 5 and inlet water control valve 6.

[0059] For example, the water pump 2 of the present invention operates for a second preset time. Taking the second preset time as 5 minutes as an example, the water pump 2 operates for 5 minutes with the wastewater control valve 5, the inlet control valve 7 and the return control valve 7 open. During the 5 minutes, the raw water and pure water are mixed to rinse the reverse osmosis filter 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. At this time, the wastewater control valve 5 and the inlet control valve 6 are closed to allow pure water to circulate and filter.

[0060] For example, such as Figure 3 As shown, step S400 includes steps S410 to S430.

[0061] S410: Obtain the running time of water pump 2.

[0062] For example, after closing the wastewater control valve 5 and the inlet water control valve 6, 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.

[0063] S420: Determine whether the running time of water pump 2 has reached the third preset time.

[0064] For example, the controller of the water purification device of the present invention has a preset 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.

[0065] S430: When the running time of water pump 2 reaches the third preset time, the wastewater control valve 5 and the inlet water control valve 6 will be opened again.

[0066] 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 5, the inlet control valve 6 and the return control valve 7 open. Then the water pump 2 runs for another 6 minutes with the wastewater control valve 5 and the inlet control valve 6 closed. During the 6 minutes, pure water is circulated and filtered. The TDS value of the water between the reverse osmosis filter 1 and the pre-filter 9 tends to be stable and very low. Pure water is then circulated and filtered again. The TDS value of the water does not change much. At this time, it is determined that the second preset condition has been met. At this time, the wastewater control valve 5 and the inlet control valve 6 are opened again to allow the raw water and pure water to mix and rinse the reverse osmosis filter 1 again.

[0067] For example, such as Figure 3As shown, step S500 includes steps S510 to S530.

[0068] S510: Obtain the running time of water pump 2.

[0069] For example, after the wastewater control valve 5 and the inlet water control valve 6 are reopened, 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.

[0070] S520: Determine whether the running time of water pump 2 has reached the fourth preset time.

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

[0072] S530: When the running time of water pump 2 reaches the fourth preset time, close the wastewater control valve 5, the inlet water control valve 6 and the return flow control valve 7 and stop the water pump 2 from running.

[0073] For example, the water pump 2 of the water purification equipment of the present invention operates for a fourth preset time. Taking the fourth preset time as 13 minutes as an example, that is, the water pump 2 operates for 5 minutes with the wastewater control valve 5, the inlet water control valve 6, and the return flow control valve 7 open. Then, the water pump 2 operates for another 6 minutes with the wastewater control valve 5 and the inlet water control valve 6 closed. Then, the water pump 2 operates for another 2 minutes with the wastewater control valve 5 and the inlet water control valve 6 reopened. During the 2 minutes, the raw water and pure water mix and rinse the reverse osmosis filter 1 again. When the TDS values ​​of the pure water side and wastewater side of the reverse osmosis filter 1 tend to stabilize, further rinsing has little impact on the TDS value of the water in the reverse osmosis filter 1. At this point, it is determined that the third preset condition has been met. At this time, the TDS value of the wastewater side of the reverse osmosis filter 1 is low, and the impact on the pure water through osmosis is small. At this time, the wastewater control valve 5, the inlet control valve 6, and the return control valve 7 are closed, and the water pump 2 is stopped, so that the water purification equipment enters the standby state, and users can drink healthy and good-tasting pure water at any time.

[0074] It should be noted that the present invention does not limit the values ​​of the second preset time, the third preset time, and the fourth preset time. For example, those skilled in the art can set the second preset time to 4 minutes or 6 minutes, the third preset time to 4 minutes or 5 minutes, and the fourth preset time to 1 minute or 3 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, the third preset time, and the fourth preset time do not deviate from the principles and scope of the present invention and should all be limited to the protection scope of the present invention.

[0075] 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.

[0076] S310: Obtain the TDS value of the wastewater discharged from the wastewater outlet, and record it as the first TDS value T1.

[0077] For example, the water purification equipment of the present invention is equipped with a TDS detection device. After the wastewater control valve 5, the inlet control valve 6 and the return control valve 7 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.

[0078] S320: Obtain the TDS value of the raw water, denoted as the second TDS value T2.

[0079] 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.

[0080] S330: Calculate the difference △T between the first TDS value T1 and the second TDS value T2, where △T = T1 - T2.

[0081] 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.

[0082] S340: Compare the difference △T with the preset difference △Ty.

[0083] 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.

[0084] S350: If the difference △T is less than the preset difference △Ty, then close the wastewater control valve 5 and the inlet control valve 6.

[0085] 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 stabilized 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 after rinsing, the TDS value of the wastewater discharged from the wastewater outlet will not decrease significantly. At this time, the wastewater control valve 5 and the inlet control valve 6 are closed to allow the pure water to circulate back for filtration, thereby reducing the TDS value of the pure water.

[0086] For example, such as Figure 4 As shown, step S400 includes steps S410 to S430.

[0087] 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.

[0088] 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 pre-filter device 9, and transmit the detection result to the controller.

[0089] S420: Compare the third TDS value T3 with the first preset value Ty1.

[0090] 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.

[0091] S430: If T3 < Ty1, then reopen the wastewater control valve 5 and the inlet control valve 6.

[0092] For example, the third TDS value T3 of the water purification device of the present invention is 150 ppm when the wastewater control valve 5 and the inlet control valve 6 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 between the reverse osmosis filter device 1 and the pre-filter device 9 is already very low and stable, and 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 5 and the inlet control valve 6 are opened again, and the reverse osmosis filter device 1 is rinsed again by mixing the raw water and the pure water with a very low TDS value to reduce the TDS value of the wastewater.

[0093] For example, such as Figure 4 As shown, step S500 includes steps S510 to S530.

[0094] S510: Obtain the TDS value of the wastewater discharged from the wastewater outlet, and record it as the fourth TDS value T4.

[0095] For example, the TDS detection device of the water purification equipment of the present invention detects the TDS value of the wastewater discharged from the wastewater outlet again and transmits the detection result to the controller.

[0096] S520: Compare the fourth TDS value T4 with the second preset value Ty2.

[0097] For example, the water purification device of the present invention can directly compare the fourth TDS value T4 with the second preset value Ty2, or it can calculate the ratio between the two, etc.

[0098] S530: If T4 < Ty2, then close the wastewater control valve 5, the inlet control valve 6, and the return control valve 7, and stop the water pump 2.

[0099] For example, the fourth TDS value T4 of the water purification device of the present invention is 250 ppm, and the second preset value Ty2 is 260 ppm. T4 < Ty2, indicating that the TDS value of the wastewater of the reverse osmosis filter device 1 has been reduced to a very low level. Through osmosis, it will not cause a significant increase in the TDS value of the pure water. At this time, the wastewater control valve 5, the inlet control valve 6, and the return control valve 7 are closed, and the water pump 2 is stopped, so that the water purification device enters the standby state. Users can drink healthy and good-tasting pure water at any time without worrying about the high TDS of the first cup of water, thus improving the user experience.

[0100] It should be noted that the present invention does not limit the values ​​of the preset difference △Ty, the first preset value Ty1, and the second preset value Ty2. For example, those skilled in the art can set the preset difference △Ty to 160ppm or 170ppm, the first preset value Ty1 to 50ppm or 70ppm, and the second preset value Ty2 to 250ppm or 270ppm, 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 preset difference △Ty, the first preset value Ty1, and the second preset value Ty2 do not deviate from the principles and scope of the present invention and should all 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 of using the running time of the water pump 2 as the judgment standard and the TDS value of the water in the water purification device as the judgment standard, those skilled in the art can also use the two judgment standards 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 standard; 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 standard; and when judging whether the third 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 standard, etc. 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 all be limited to the protection scope of the present invention.

[0102] It should also be noted that the rinsing step of the wastewater from the reverse osmosis filter 1 in the water purification equipment of the present invention can be repeated. For example, after step S400 is completed, step S300 can be run again, and then step S400 can be run again. That is, the pure water return and raw water mixing rinsing step and the pure water circulation filtration step are repeated to repeatedly rinse the wastewater from the reverse osmosis filter 1, thereby further reducing the TDS value of the wastewater from the reverse osmosis filter 1 and improving the taste of pure water. Such flexible adjustment and change does not deviate from the principle and scope of the present invention and should be limited to the protection scope of the present invention.

[0103] It should also be noted that in step S500, the order of closing the wastewater control valve 5, the inlet control valve 6, and the return control valve 7 and stopping the water pump 2 can be set as follows: first, close the inlet control valve 6 and the return control valve 7 and stop the water pump 2. The water pressure in the water purification equipment will compress the wastewater side of the reverse osmosis filter 1, thereby discharging the water from the wastewater side of the reverse osmosis filter 1, which can further reduce the TDS value of the wastewater of the reverse osmosis filter 1. After a preset time, the wastewater control valve 5 is then closed.

[0104] 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.

[0105] 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.

[0106] 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 of a water purifying apparatus, characterized by, The water purification equipment includes a reverse osmosis filter (1), a water pump (2), 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 a water source through a fourth pipeline (44). A wastewater control valve (5) is provided on the second pipeline (42). An inlet control valve (6) is provided on the fourth pipeline (44). The two ends of the return pipeline (3) are connected to the pure water outlet and the inlet of the water pump (2), respectively. A return control valve (7) is provided on the return pipeline (3). 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 (5), the inlet control valve (6), and the return control valve (7) 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 (5) and the inlet control valve (6), 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 has been met, reopen the wastewater control valve (5) and the inlet control valve (6), and make the water pump (2) continue to run. 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. Determine whether the third preset condition has been met, and when the third preset condition is met, close the wastewater control valve (5), the inlet control valve (6) and the return control valve (7) and stop the water pump (2). The third preset condition includes the running time of the water pump (2) or the TDS value of the water in the water purification equipment.

2. The control method of the water purifying apparatus according to claim 1, characterized by, The steps of "determining whether the first preset condition has been met, and closing the wastewater control valve (5) and the inlet control valve (6) when the first preset condition is met" specifically include: Obtain the running 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 (5) and the water inlet control valve (6) 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 (5) and the inlet control valve (6) 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 (5) and the inlet control valve (6).

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 (5) and the inlet control valve (6) 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 (5) and the inlet control valve (6) are closed.

5. The control method for the water purification equipment according to claim 1, characterized in that, The judgment step of "determining whether the second preset condition has been met, and opening the wastewater control valve (5) and the inlet control valve (6) again when the second preset condition is met" specifically includes: 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 (5) and the inlet control valve (6) are opened again.

6. The control method for the water purification equipment according to claim 1, characterized in that, The judgment step of "determining whether the second preset condition has been met, and opening the wastewater control valve (5) and the inlet control valve (6) again when the second preset condition is met" specifically includes: Obtain the running 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 (5) and the water inlet control valve (6) are opened again.

7. The control method for the water purification equipment according to claim 1, characterized in that, The steps of "determining whether the third preset condition has been met, and when the third preset condition is met, closing the wastewater control valve (5), the inlet control valve (6), and the return control valve (7) and stopping the water pump (2)" specifically include: Obtain the running time of the water pump (2); Determine whether the running time of the water pump (2) has reached the fourth preset time; When the running time of the water pump (2) reaches the fourth preset time, the wastewater control valve (5), the water inlet control valve (6) and the return flow control valve (7) are closed and the water pump (2) stops running.

8. The control method for the water purification equipment according to claim 1, characterized in that, The steps of "determining whether the third preset condition has been met, and when the third preset condition is met, closing the wastewater control valve (5), the inlet control valve (6), and the return control valve (7) and stopping the water pump (2)" specifically include: The TDS value of the wastewater discharged from the wastewater outlet is obtained and denoted as the fourth TDS value T4; Compare the fourth TDS value T4 with the second preset value Ty2; If T4 < Ty2, then close the wastewater control valve (5), the inlet control valve (6), and the return control valve (7) and stop the water pump (2).

9. The control method for the water purification equipment according to any one of claims 1 to 8, characterized in that, The steps of "closing the wastewater control valve (5) and the inlet control valve (6)" specifically include: First, close the wastewater control valve (5), and then close the inlet control valve (6) after a fifth 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 equipment; 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.

10. 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 9.

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