A control method for a water purification device

Abstract

This application provides a control method for a water purification device, comprising: a pre-adjustment stage: receiving a user's water intake command, detecting and acquiring the cold water pump flow rate S1, and adjusting the flow output of the booster pump based on a comparison between the cold water pump flow rate S1 and a preset flow threshold S0; a temperature adjustment stage: adjusting the power output of the heating unit and / or the flow output of the cold water pump to make the actual outlet water temperature T1 of the mixing unit reach the target temperature T0 indicated by the water intake command; and a backflow adjustment stage: adjusting the flow output of the booster pump based on the current actual outlet water temperature T1, and maintaining the flow output of the booster pump until the user stops taking water when the actual outlet water temperature T0 reaches the target temperature T0 again. This application can minimize the amount of backflow water in the backflow path while ensuring the outlet water temperature.

Description

Technical Field

[0001] This application relates to the field of water purification equipment technology, and in particular to a control method for water purification equipment. Background Technology

[0002] As people's quality of life improves, water purifiers and other water purification equipment are being used more and more widely in people's daily lives.

[0003] Existing water purification equipment includes a purification unit, a mixing unit, and an outlet unit. The outlet unit includes a hot water outlet unit, and the mixing unit includes a heating unit. These units can be connected sequentially to form a hot water outlet circuit. When the equipment is operating, the purification unit outputs pure water to the mixing unit. The heating unit within the mixing unit heats the pure water, and the heated water is then output as hot water through the hot water outlet unit. In practice, due to the limited heating power of the heating unit, the hot water outlet circuit can only output a small flow of hot water. This means the purification unit only needs to output a small flow of pure water to the mixing unit. However, in reality, the purification unit outputs a larger flow of pure water. Therefore, a return water path is usually installed between the purification end and the outlet end of the purification unit to return excess pure water output by the purification unit.

[0004] However, when the return water flow rate is large, the pressure before the membrane in the filtration section of the water purification unit will increase, the overall power will increase, and the overall cost will increase. The water purification unit will also vibrate more during water production, resulting in excessive noise that affects the user experience. At the same time, it will shorten the life of the filter element and reduce the filtration efficiency, which will greatly reduce the user experience.

[0005] In existing technologies, the backflow can be reduced by directly decreasing the power of the booster pump. However, directly reducing the power will affect the hot water output flow, resulting in insufficient water output. At the same time, the water temperature will also be affected, impacting the user experience.

[0006] Therefore, there is an urgent need for a technical solution that can significantly reduce or eliminate backflow while ensuring the flow rate and temperature of the effluent. Summary of the Invention

[0007] The purpose of this application is to provide a control method for a water purification device that can minimize the amount of return water in the return water path while ensuring the outlet water temperature.

[0008] This application provides a control method for a water purification device. The water purification device includes a water purification unit, a water mixing unit, and a water outlet unit. The water mixing unit includes a cold water pump and a heating unit. The water purification unit includes a booster pump. A return water path is provided between the water outlet end and the water inlet end of the water purification unit.

[0009] The control method for the water purification equipment includes:

[0010] Pre-adjustment stage: Receive the user's water intake command, detect and obtain the real-time flow rate S1 of the cold water pump, and adjust the flow output of the booster pump according to the comparison result between the real-time flow rate S1 and the preset flow rate threshold S0.

[0011] Temperature regulation stage: Adjust the power output of the heating unit and / or the flow output of the cold water pump so that the actual outlet water temperature T1 of the mixing unit reaches the target temperature T0 indicated by the water intake command;

[0012] Backflow adjustment phase: Adjust the flow output of the booster pump according to the current actual outlet water temperature T1. When the actual outlet water temperature T1 reaches the target temperature T0 again, maintain the flow output of the booster pump until the user stops taking water.

[0013] In one embodiment, adjusting the flow output of the booster pump based on a comparison between the real-time flow rate S1 and a preset flow rate threshold S0 includes:

[0014] Gradually reduce the flow output of the booster pump until the difference between the real-time flow rate S1 and the preset flow threshold S0 meets the preset range, and record the current flow rate of the booster pump as the reference flow rate S;

[0015] Gradually increase the flow output of the booster pump until the flow multiple between the current outlet flow rate S2 and the reference flow rate S is equal to the preset adjustment coefficient.

[0016] In one embodiment, when the difference between the real-time flow rate S1 and the preset flow rate threshold S0 meets the preset range, the current duty cycle of the booster pump is recorded as the reference duty cycle P0; when the flow rate multiple between the current outlet flow rate S2 of the booster pump and the reference flow rate S is equal to the preset adjustment coefficient, the current duty cycle of the booster pump is recorded as the initial duty cycle P1.

[0017] In one embodiment, the method for obtaining the preset traffic threshold S0 is as follows:

[0018] After the water purification equipment is powered on, the cold water pump and the booster pump are turned on with the rated voltage. After the cold water pump has been working continuously for a preset time, the current flow output of the cold water pump is recorded as a preset flow threshold S0, which is used to adjust the flow output of the booster pump.

[0019] In one embodiment, during the temperature adjustment stage, the theoretical water flow rate S3 of the cold water pump is calculated based on the target temperature T0, the inlet water temperature T2, and the rated heating power P of the heating unit; the temperature adjustment method is determined based on the theoretical water flow rate S3 of the cold water pump and the preset flow rate threshold S0, and the power output of the heating unit and / or the flow rate output of the cold water pump are adjusted.

[0020] In one embodiment, the temperature regulation method is determined based on the theoretical outlet flow rate S3 of the cold water pump and the preset flow rate threshold S0, including:

[0021] Compare the theoretical outflow rate S3 with the preset flow threshold S0;

[0022] If the theoretical outflow rate S3 is greater than or equal to the preset flow threshold S0, the temperature adjustment method is to control the cold water pump to output water at the preset flow threshold S0 and adjust the heating power of the heating unit.

[0023] If the theoretical outflow rate S3 is less than the preset flow rate threshold S0, the temperature adjustment method is to control the heating unit to operate at the rated heating power P and adjust the real-time flow rate S1 of the cold water pump.

[0024] In one embodiment, the temperature regulation method specifically includes:

[0025] The actual outlet water temperature T1 of the mixing unit is detected. When the actual outlet water temperature T1 is greater than the target temperature T0, the heating power of the heating unit is reduced or the real-time flow rate S1 of the cold water pump is increased. When the actual outlet water temperature T1 is less than the target temperature T0, the heating power of the heating unit is increased or the real-time flow rate S1 of the cold water pump is decreased.

[0026] In one embodiment, adjusting the flow output of the booster pump according to the current actual outlet water temperature T1, by first gradually decreasing and then gradually increasing the flow output, includes:

[0027] When the actual outlet water temperature T1 stabilizes at the target temperature T0, the flow output of the booster pump is gradually reduced, and the actual outlet water temperature T1 remains unchanged.

[0028] The actual outlet water temperature T1 is continuously monitored, and the comparison result between the actual outlet water temperature T1 and the target temperature T0 is obtained. When the actual outlet water temperature T1 is detected to be greater than the target temperature T0, the flow output of the booster pump is gradually increased so that the actual outlet water temperature T1 reaches the target temperature T0 again.

[0029] In one embodiment, during the adjustment step of the booster pump, if the actual outlet water temperature T1 is detected to be equal to the target temperature T0 during the process of gradually increasing the flow output, the flow output of the booster pump is controlled again in a cyclic adjustment manner by first gradually decreasing and then gradually increasing the flow output.

[0030] In one embodiment, when the actual outlet water temperature T1 is maintained at the target temperature T0, the current duty cycle of the booster pump is recorded as the final duty cycle P3 and associated with the target temperature T0.

[0031] This application provides a control method for a water purification device. The method first controls the water purification unit to adjust the flow output of the booster pump based on a comparison between the real-time flow rate S1 of the cold water pump and a preset flow threshold S0, thus initially determining the output of the booster pump. Then, based on the user's desired hot water temperature, the actual outlet temperature of the mixing unit is adjusted. When the actual outlet temperature stabilizes at the user's desired hot water temperature, the flow output of the booster pump is further adjusted. With the adjustment of the water purification unit's outlet flow rate, the actual outlet temperature of the mixing unit also changes. When the actual outlet temperature of the mixing unit again equals the user's desired hot water temperature, the adjustment of the booster pump's flow output is stopped, and the booster pump continues to output water at the current flow rate. Specifically, after stopping the adjustment of the booster pump's outlet flow rate, the actual outlet temperature of the mixing unit reaches the user's desired hot water temperature, and there is no or only a small amount of backflow water in the return path.

[0032] In summary, it can be seen that controlling the hot water output of the water purification equipment according to the method of this application can minimize the amount of return water in the return path while ensuring the actual output water temperature. By reducing the amount of return water in the return path, the pressure before the membrane in the filtration section of the water purification unit is reduced, resulting in lower overall power consumption and lower overall cost compared to existing technologies. The vibration of the water purification unit during water production is significantly reduced, lowering noise during use. At the same time, the filter cartridge life is increased, filtration efficiency is improved, and the user experience is enhanced. Attached Figure Description

[0033] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments of this application will be briefly described below.

[0034] Figure 1 This is a schematic diagram of the water circuit of the water purification device provided in the first embodiment of this application;

[0035] Figure 2 This is a schematic diagram of the structure of a control unit provided in an embodiment of this application;

[0036] Figure 3 This is a schematic diagram of the water circuit of the water purification device provided in the second embodiment of this application;

[0037] Figure 4 A schematic flowchart illustrating the control method for the water purification equipment provided in the first embodiment of this application;

[0038] Figure label:

[0039] 1-Water purification equipment; 10-Water purification unit; 110-Boost pump; 120-RO filter element; 130-Pressure reducing valve; 20-Mixing unit; 210-Cold water pump; 220-Heating unit; 230-Blending area; 310-Hot water outlet unit; 320-Cold water outlet unit; 330-Wastewater outlet unit; 40-Return water path; 410-Return valve; 50-Inlet unit; 510-Inlet; 520-PP cotton; 530-Inlet valve; 610-Temperature sensor; 70-Control unit; 71-Bus; 72-Processor; 73-Memory. Detailed Implementation

[0040] The technical solutions in the embodiments of this application will now be described with reference to the accompanying drawings.

[0041] Similar reference numerals and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. Furthermore, in the description of this application, terms such as "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0042] Please refer to Figure 1 This is a schematic diagram of the water circuit of the water purification device 1 provided in the first embodiment of this application. Please refer to... Figure 2 This is a schematic diagram of the structure of the control unit 70 provided in an embodiment of this application. Please refer to... Figure 3 This is a schematic diagram of the water circuit of the water purification device 1 provided in the second embodiment of this application.

[0043] In one embodiment, such as Figure 1 As shown, the water purification equipment 1 is equipped with a water purification unit 10, a mixing unit 20, and a water outlet unit. The water purification unit 10 includes a booster pump 110, the mixing unit 20 includes a cold water pump 210 and a heating unit 220, and the water outlet unit includes a hot water outlet unit 310. The water purification unit 10, the cold water pump 210, the heating unit 220, and the hot water outlet unit 310 are connected in sequence to form a hot water outlet circuit. A return water path 40 is provided between the water outlet end and the water inlet end of the water purification unit 10.

[0044] In the above, the water purification unit 10 has a first water outlet and a second water outlet. The first water outlet is connected to the water inlet of the mixing unit 20, and the second water outlet is connected to the water inlet of the return water path 40.

[0045] After receiving a user's hot water request, water purifier 1 can use... Figure 1 The hot water outlet circuit shown outputs hot water. Specifically, the principle of hot water output is as follows:

[0046] The pure water output from the water purification unit 10 is divided into two parts. One part flows back to the inlet of the water purification unit 10 via the return water path 40, and the other part is sent to the mixing unit 20. After the pure water enters the mixing unit 20, the heating unit 220 in the mixing unit 20 heats the pure water to the target temperature required by the user. After successful heating, the hot water is output through the hot water outlet unit 310.

[0047] In another embodiment, such as Figure 3 As shown, in this embodiment, the water purification device 1 includes an inlet unit 50, a purification unit 10, a mixing unit 20, and an outlet unit. The inlet unit 50 includes an inlet 510, a PP cotton filter 520, and an inlet valve 530. The purification unit 10 includes a booster pump 110, an RO filter 120, and a pressure reducing valve 130. The mixing unit 20 includes a cold water pump 210, a mixing zone 230, and a heating unit 220. The outlet unit includes a hot water outlet unit 310, a cold water outlet unit 320, and a wastewater outlet unit 330. The inlet 510, PP cotton filter 520, and inlet valve are all included in the design. A hot water outlet circuit is formed by sequentially connecting the following components: 530, booster pump 110, RO filter 120, pressure reducing valve 130, cold water pump 210, mixing zone 230, heating unit 220, and hot water outlet unit 310. A cold water outlet circuit is formed by sequentially connecting the following components: inlet 510, PP cotton 520, inlet valve 530, booster pump 110, RO filter 120, and cold water outlet unit 320. A wastewater outlet circuit is formed by sequentially connecting the following components: inlet 510, PP cotton 520, inlet valve 530, booster pump 110, RO filter 120, and wastewater outlet unit 330. A return water path 40 is provided between the outlet and inlet of the water purification unit 10, and the return water path 40 includes a return valve 410. The water purification unit 10 has a first water outlet and a second water outlet. The first water outlet is connected to the water inlet of the mixing unit 20, and the second water outlet is connected to the water inlet of the return water path 40.

[0048] After receiving the user's instruction to dispense cold water, water purification device 1 can use... Figure 3 The cold water outlet circuit shown outputs cold water. Specifically, the principle of cold water output is as follows:

[0049] Raw water enters the water purification unit 10 through the water inlet unit 50. The RO filter element 120 in the water purification unit 10 filters the raw water, and after filtration, wastewater and pure water are formed. The wastewater is discharged through the wastewater outlet unit 330, and the pure water is output through the cold water outlet unit 320.

[0050] After receiving a user's hot water request, water purifier 1 can use... Figure 3 The hot water outlet circuit shown outputs hot water. Specifically, the principle of hot water output is as follows:

[0051] Raw water enters the water purification unit 10 through the inlet unit 50. The RO filter element 120 in the water purification unit 10 filters the raw water, resulting in wastewater and pure water. The wastewater is discharged through the wastewater outlet unit 330, while the pure water is divided into two parts: one part flows back to the inlet of the water purification unit 10 through the return valve 410, and the other part is sent to the mixing unit 20. After the pure water enters the mixing unit 20, the heating unit 220 heats the pure water to the target temperature required by the user. After heating, the hot water is output through the hot water outlet unit 310.

[0052] It is worth noting that, in the above Figure 1 and Figure 3 In this system, the flow rate of pure water supplied from the water purification unit 10 to the mixing unit 20 is determined by the outlet flow rate of the cold water pump 210; the flow rate of return water in the return water path 40 is determined by the outlet flow rate of the water purification unit 10 and the outlet flow rate of the cold water pump 210; and the flow rate of hot water output from the hot water outlet unit 310 is determined by the outlet flow rate of the cold water pump 210. For example, in theoretical calculations, if the flow rate of pure water output from the water purification unit 10 is A, and the outlet flow rate of the cold water pump 210 is B, then the water purification unit 10 will supply pure water at a flow rate of B to the mixing unit 20, the flow rate of return water in the return water path 40 will be AB, and the flow rate of hot water output from the hot water outlet unit 310 will be B.

[0053] In addition, in the above Figure 3 In the above calculations, the sum of the flow rate of wastewater from wastewater effluent unit 330 and the flow rate of pure water from water purification unit 10 equals the flow output of booster pump 110. The flow rate of pure water from water purification unit 10 equals the sum of the flow rate of cold water pump 210 and the flow rate of return water in return water path 40. Based on the above, it can be concluded that, in theoretical calculations, the sum of the flow rate of wastewater from wastewater effluent unit 330, the flow rate of cold water pump 210, and the flow rate of return water in return water path 40 equals the flow output of booster pump 110, and the flow output of booster pump 110 is greater than the flow rate of cold water pump 210. However, the flow rate of wastewater from wastewater effluent unit 330 is related to the operating pressure of booster pump 110. Different operating pressures of booster pump 110 will result in different flow rates of wastewater discharged from wastewater effluent unit 330. When the flow rate of wastewater discharged from wastewater effluent unit 330 is unstable, the flow output of booster pump 110 has no fixed relationship with the flow rate of cold water pump 210.

[0054] The above content shows that, in use Figure 1 and Figure 3When hot water is output from the hot water outlet circuit shown, backflow occurs, which increases the working pressure of the booster pump 110. When the booster pump 110 operates at a higher pressure, the pressure before the membrane in the filtration section of the water purification unit increases, leading to increased overall power consumption and cost. Furthermore, the water purification unit experiences greater vibration during water production, resulting in higher noise levels and negatively impacting user experience. This also shortens filter lifespan and reduces filtration efficiency, resulting in a poor user experience. Therefore, this application provides a control method for the water purification device 1. Using this method, the operating state of the water purification device 1 when outputting hot water can be controlled, effectively reducing the backflow rate of the water purification device 1 while ensuring the water flow rate and temperature.

[0055] like Figure 2 As shown, the water purification device 1 may include a control unit 70, which is used to execute the control method of the water purification device 1 in this application. Specifically, as... Figure 2 As shown, the control unit 70 includes at least one processor 72 and a memory 73. Figure 2 Taking a processor 72 as an example. The processor 72 and the memory 73 are connected via a bus 71. The memory 73 stores instructions that can be executed by the processor 72, and the instructions are executed by the processor 72.

[0056] The following is based on Figure 3 Taking the water circuit diagram shown below as an example, the working principle of the control method of water purification equipment 1 will be explained in detail:

[0057] Please refer to Figure 4 This is a flowchart illustrating the control method of the water purification device 1 provided in the first embodiment of this application. Figure 4 As shown, the method includes the following steps S210-S230.

[0058] Step S210: Pre-adjustment stage: Receive the user's water intake command, detect and obtain the real-time flow rate S1 of the cold water pump, and adjust the flow output of the booster pump according to the comparison result between the real-time flow rate S1 and the preset flow rate threshold S0.

[0059] The water intake command includes the target temperature T0 of the hot water required by the user, the real-time flow rate S1 is the real-time water flow rate at the outlet of the cold water pump 210 during the water production and output process, the preset flow threshold S0 is the maximum water flow rate of the cold water pump 210, and the flow output of the booster pump 110 can be the duty cycle of the booster pump 110 or the flow rate at the outlet of the booster pump 110.

[0060] Specifically, the method for obtaining the preset flow threshold S0 is as follows: after the water purification equipment is powered on, the cold water pump and the booster pump are turned on with the rated voltage. After the cold water pump has been working continuously for a preset time, the current flow output of the cold water pump is recorded as the preset flow threshold S0, which is used to adjust the flow output of the booster pump. By driving the cold water pump 210 with the rated voltage, the maximum water flow of the cold water pump 210 is obtained. The preset time is a fixed value preset in the control unit 70, and the specific size depends on the actual situation. It is not limited in this application.

[0061] In this step, when a user needs hot water, they can send a water-retrieving command to the control unit 70. For example, the water purifier 1 may have a water-retrieving button, which the user can trigger to send a water-retrieving command to the control unit 70. This water-retrieving button can be a hardware button or a software button. For example, the water purifier 1 can be connected to the user's mobile terminal network, allowing the user to send a water-retrieving command to the control unit 70 via the mobile terminal.

[0062] After receiving a water intake command, the control unit 70 detects and obtains the real-time flow rate S1 of the cold water pump 210 and compares it with a preset flow rate threshold S0 to control the flow output of the booster pump 110. Once the flow output of the booster pump 110 stabilizes, the control unit 70 can continue to execute the following step S220.

[0063] Step S220: Temperature adjustment stage: Adjust the power output of the heating unit 220 and / or the flow output of the cold water pump 210 so that the actual outlet water temperature T1 of the mixing unit reaches the target temperature T0 indicated by the water intake command.

[0064] In this step, after receiving a water intake command, the control unit 70 can parse the target hot water temperature T0 required by the user from the command. After successful parsing, the control unit 70 can adjust the actual outlet water temperature T1 of the mixing unit. Specifically, this is achieved by adjusting the power output of the heating unit 220 and / or the flow rate output of the cold water pump 210. When the actual outlet water temperature reaches the target hot water temperature T0 required by the user, the control unit 70 can stop adjusting the actual outlet water temperature T1. After the adjustment stops, the control unit 70 can continue to execute the following step S230. After the adjustment stops, the hot water outlet circuit outputs hot water at the target temperature T0, and simultaneously, the return water circuit 40 returns excess pure water output from the water purification unit 10.

[0065] Step S230: Reflux adjustment stage: Adjust the flow output of the booster pump according to the current actual outlet water temperature T1. When the actual outlet water temperature T0 reaches the target temperature T0 again, maintain the flow output of the booster pump until the user stops taking water.

[0066] In this step, the control unit 70 can adjust the flow output of the booster pump 110. Since the water flow rate of the water purification unit 10 is determined by the flow output of the booster pump 110, the water flow rate of the water purification unit 10 will also change when the control unit 70 adjusts the flow output of the booster pump 110. When the water flow rate of the water purification unit 10 changes, the flow rate of pure water flowing into the return water path 40 and the mixing unit 20 will also change, which in turn will cause the actual water temperature T1 of the mixing unit to change. Therefore, in this step, when the control unit 70 adjusts the flow output of the booster pump 110, it specifically adjusts the flow output of the booster pump by first gradually decreasing and then gradually increasing the flow output. During the adjustment process, the change in the actual water temperature T1 can be monitored in real time. Based on the change in the actual water temperature T1, the flow rate of pure water in the return water path 40 and the mixing unit 20 can be deduced. When the control unit 70 detects that the actual outlet water temperature T1 stabilizes at the target temperature T0 again, it can be inferred that there is little or no return water in the return water path 40, and at the same time, the flow rate of pure water in the mixing unit 20 is large enough to meet the user's water intake requirements. At this time, the control unit 70 can stop adjusting the flow output of the booster pump 110 and control the booster pump 110 to maintain the current outlet water flow rate after stopping the adjustment. When the user stops taking water, the control unit 70 can control the booster pump 110 to stop discharging water and at the same time control the water purification device 1 to stop working, or control the water purification device 1 to be in standby mode.

[0067] As can be seen from the above, when controlling the hot water output of the water purification device 1 according to the method of this application, the amount of return water in the return water path 40 can be minimized while ensuring the output water temperature and flow rate. By reducing the amount of return water in the return water path 40, the pre-membrane pressure of the RO filter element 120 in the water purification unit 10 is reduced, which lowers the overall power consumption and overall cost compared to existing technologies. The vibration of the water purification unit 10 during water production is significantly reduced, thus reducing noise during use. At the same time, the lifespan of the RO filter element 120 is increased, the filtration efficiency is improved, and the user experience is enhanced.

[0068] Furthermore, when there is a large amount of return water in the return water path 40, the operating power of the booster pump 110 will also increase, and the working efficiency of the water purification device 1 will be lower when the operating power of the booster pump 110 increases. By using the method in this application to control the hot water output of the water purification device 1, the working efficiency of the water purification device 1 can be improved while reducing the operating power of the booster pump 110.

[0069] In one embodiment, the control unit 70, when performing the above step S210, adjusts the flow output of the booster pump based on the comparison result between the real-time flow rate S1 and the preset flow rate threshold S0, including:

[0070] Step S310: Gradually reduce the flow output of the booster pump until the difference between the real-time flow S1 and the preset flow threshold S0 meets the preset range, and record the current flow of the booster pump as the reference flow S.

[0071] In step S310 above, the booster pump is started normally, the maximum output of the cold water pump is turned on, and its flow output is gradually reduced to obtain the minimum flow output of the booster pump to meet the maximum output of the cold water pump. Specifically, the difference between the real-time flow rate S1 of the cold water pump and the preset flow threshold S0 (i.e., the maximum flow output of the cold water pump) is used to determine whether the booster pump meets the above requirements. In the specific implementation of this embodiment, the preset range of the difference can be set to 5ml / min-10ml / min. At the same time, by continuously comparing the real-time flow rate S1 and the preset flow threshold S0, when the flow output of the booster pump is gradually reduced, the control of the booster pump is stopped when the real-time flow rate S1 is just less than the preset flow threshold S0.

[0072] As can be seen from the above, when the booster pump 110 discharges water at the reference flow rate S, the chilled water pump 210 can discharge water approximately at the preset flow rate threshold S0. Simultaneously, when both the booster pump 110 and the chilled water pump 210 discharge water at the preset flow rate threshold S0, there is almost no backflow water in the return water path 40, and all the pure water output by the water purification unit 10 will enter the mixing unit 20. Furthermore, it can be understood that when the booster pump 110 discharges water at the reference flow rate S, the chilled water pump 210 can discharge water at any flow rate, and the reference flow rate S is the minimum flow rate that allows the chilled water pump 210 to discharge water at any flow rate.

[0073] Step S311: Gradually increase the flow output of the booster pump until the flow multiple between the current outlet flow rate S2 and the reference flow rate S is equal to the preset adjustment coefficient.

[0074] In step S311 above, before the hot water is produced and the water flow rate and temperature are stable, the booster pump needs to be supplied with a flow rate greater than that of the cold water pump. Otherwise, problems such as excessively high temperature and jetting due to insufficient water supply from the booster pump may occur during the process of increasing the flow rate of the cold water pump, affecting the control of the cold water pump. Therefore, a certain margin needs to be left for the booster pump in the pre-adjustment stage. In this embodiment, the flow output of the booster pump is gradually increased after step S310 until the current water flow rate S2 of the booster pump meets the preset value.

[0075] In this embodiment, the outlet flow rate S2 is determined by the multiple relationship with the reference flow rate S. Specifically, an adjustment coefficient is set and obtained by multiplying the specific value of the reference flow rate S obtained in the aforementioned steps. This adjustment coefficient is a constant greater than or equal to 1. In this embodiment, the adjustment coefficient can be 1.3, so that the booster pump has a 30% margin to meet the water supply demand.

[0076] According to step S311 above, when the booster pump 110 operates at the reference flow rate S, the chilled water pump 210 can discharge water at any flow rate. Since the flow rate S2 of the booster pump is greater than the reference flow rate S, when the booster pump 110 discharges water at the flow rate S2, the chilled water pump 210 can also discharge water at any flow rate.

[0077] In steps S311 and S312 above, the following steps are also included: when the difference between the real-time flow rate S1 and the preset flow rate threshold S0 meets the preset range, the current duty cycle of the booster pump is recorded as the reference duty cycle P0; when the flow rate multiple between the current outlet flow rate S2 of the booster pump and the reference flow rate S is equal to the preset adjustment coefficient, the current duty cycle of the booster pump is recorded as the initial duty cycle P1. By recording the reference duty cycle P0 of the booster pump at the minimum flow rate output when the maximum output of the cold water pump is met, and the initial duty cycle P1 that meets the margin setting, it is convenient for users to directly use the reference duty cycle P0 and the initial duty cycle P1 as the starting conditions of the booster pump when using the water purification equipment 1, saving unnecessary steps, reducing the control process of the booster pump, and reducing energy consumption while speeding up the water output speed.

[0078] In one embodiment, the control unit 70 can adjust the actual outlet water temperature T1 of the mixing unit 20 by adjusting the operating parameters of the heating unit 220 or the cold water pump 210. Specifically, the control unit 70 can adjust the operating parameters of the heating unit 220 or the cold water pump 210 through temperature regulation. Before adjusting the operating parameters of the heating unit 220 or the cold water pump 210 through temperature regulation, the control unit 70 first determines the aforementioned temperature regulation method. The specific principle is explained in detail below:

[0079] Step S411: During the temperature regulation stage, the theoretical water flow rate S3 of the cold water pump 210 is calculated based on the target temperature T0, the inlet water temperature T2, and the rated heating power P of the heating unit 220.

[0080] Wherein, the inlet water temperature T2 is the temperature of the cold water pump outlet, that is, the temperature of the heating unit 220 inlet; the theoretical outlet water flow rate S3 is the theoretical outlet water flow rate that the cold water pump 210 needs to achieve when the actual outlet water temperature T1 of the mixing unit 20 is equal to the target temperature T0, and the heating unit 220 is running at the rated heating power P.

[0081] In this step, the control unit 70 can measure the outlet water temperature of the cold water pump 210 as the inlet water temperature T2 of the heating unit through the temperature sensor 610 in the mixing area 230. After obtaining the inlet water temperature T2, the control unit 70 can determine the temperature adjustment method based on the target hot water temperature T0 required by the user, the inlet water temperature T2, and the rated heating power P of the heating unit 220. When determining the temperature adjustment method, the control unit 70 can first calculate the theoretical outlet water flow rate that the cold water pump 210 needs to achieve in order for the actual outlet water temperature T1 of the mixing unit 20 to reach the target temperature T0, that is, first calculate the theoretical outlet water flow rate S3 of the cold water pump 210. Specifically, the control unit 70 can substitute the target temperature T0, the inlet water temperature T2, and the rated heating power P of the heating unit 220 into the following formula (1). After successful substitution, the theoretical outlet water flow rate S3 can be successfully calculated. After successful calculation, the control unit 70 can continue to execute the following step S412.

[0082]

[0083] In formula (1), c is the specific heat capacity and S is the theoretical outlet flow rate S3 of the cold water pump 210.

[0084] It is worth noting that c is the specific heat capacity of water; the above formula (1) is derived from the following formulas (2) to (4). When performing equation operations on formulas (2) and (3) and substituting formula (3) into formula (1), the above formula (1) can be obtained.

[0085] Q=cm(T0-T2) (2)

[0086] Q = ηPt (3)

[0087] m=Sρt (4)

[0088] Where Q is energy, m is mass, t is time, S is flow rate, ρ is density, and η is heating efficiency; in this embodiment, ρ = 1 g / ml and heating efficiency η = 1.

[0089] Step S412: Determine the temperature regulation method based on the theoretical water flow rate S3 of the cold water pump and the preset flow threshold S0, and adjust the power output of the heating unit and / or the flow output of the cold water pump.

[0090] Specifically, after successfully calculating the theoretical outlet flow rate S3, the control unit 70 can compare the theoretical outlet flow rate S3 with the preset flow rate threshold S0 that the cold water pump 210 can reach. If the comparison result shows that the theoretical outlet flow rate S3 is greater than or equal to the preset flow rate threshold S0, it indicates that the deviation between the target temperature T0 and the inlet water temperature T2 is small. Therefore, the temperature regulation method can be determined to control the cold water pump 210 to output water at the maximum outlet flow rate Smax, while simultaneously adjusting the heating power of the heating unit 220 according to the relationship between the actual outlet water temperature T1 and the target temperature T0. If the comparison result shows that the theoretical outlet flow rate S3 is less than the preset flow rate threshold S0, it indicates that the deviation between the target temperature T0 and the inlet water temperature T2 is large. Therefore, the temperature regulation method can be determined to control the heating unit 220 to operate at the rated heating power P, while simultaneously adjusting the outlet flow rate of the cold water pump 210 according to the relationship between the actual outlet water temperature T1 and the target temperature T0.

[0091] In a specific implementation of this embodiment, the specific adjustment method for the outlet flow rate of the cold water pump 210 and the heating power of the heating unit 220 is as follows: detect the actual outlet water temperature T1 of the mixing unit; when the actual outlet water temperature T1 is greater than the target temperature T0, reduce the heating power of the heating unit or increase the real-time flow rate S1 of the cold water pump; when the actual outlet water temperature T1 is less than the target temperature T0, increase the heating power of the heating unit or decrease the real-time flow rate S1 of the cold water pump.

[0092] Once the temperature regulation method is determined, the control unit 70 can adjust the actual outlet water temperature T1 of the mixing unit 20 according to the temperature regulation method. When the actual outlet water temperature T1 stabilizes at the target temperature T0, and the actual outlet water flow rate of the hot water outlet circuit tends to stabilize, the control unit 70 can stop adjusting the actual outlet water temperature T1.

[0093] When the actual outlet water temperature T1 of the mixing unit 20 is adjusted according to the adjustment method in this embodiment, the water flow rate of the hot water outlet circuit can also reach the maximum while ensuring that the actual outlet water temperature T1 reaches the target temperature T0, thus improving the user's water intake experience.

[0094] In one embodiment, when the control unit 70 adjusts the flow output of the booster pump 110, it adjusts it by first gradually decreasing and then gradually increasing the flow output. That is, when the actual outlet water temperature T1 is stable at the target temperature T0, the flow output of the booster pump is gradually decreased, while the actual outlet water temperature T1 remains unchanged at first.

[0095] Specifically, when the flow output of the booster pump 110 is initially reduced, the flow rate of the return water flowing into the return water path 40 is...

[0096] The flow rate of pure water flowing into the mixing unit 20 will gradually decrease, and the flow rate of pure water flowing into the mixing unit 20 will not change. When the flow rate of pure water flowing into the mixing unit 20 does not change, the actual outlet water temperature T1 of the mixing unit 20 will not change and will remain at the target temperature T0. After reducing the outlet water flow rate of the booster pump 110 for a period of time, there will be almost no return water in the return water path 40, and the flow rate of pure water flowing into the mixing unit 20 will gradually decrease.

[0097] In this embodiment, the method further includes continuously detecting the actual outlet water temperature T1 and obtaining a comparison result between the actual outlet water temperature T1 and the target temperature T0. Based on the comparison result, it is determined whether to stop the control process of gradually reducing the flow output of the booster pump, and whether to start gradually increasing the flow output of the booster pump. The final flow output size of the booster pump is determined. In this embodiment, the final duty cycle P3 represents the flow output size. When the control unit 70 does not receive other instructions, the booster pump is driven with the final duty cycle P3 until the current water intake stops.

[0098] In the above process, due to the continuous reduction of the flow output of the booster pump 110, the flow rate of pure water flowing into the mixing unit 20 decreases to a certain value, causing the actual outlet water temperature T1 to be higher than the target temperature T0. When the actual outlet water temperature of the mixing unit is higher than the target temperature T0, the control unit 70 can gradually increase the flow output of the booster pump 110. As the flow rate of the booster pump 110 increases, the flow rate of pure water flowing into the mixing unit 20 also gradually increases. After the flow rate of pure water flowing into the mixing unit 20 increases, the actual outlet water temperature of the mixing unit will gradually decrease. When the actual outlet water temperature of the mixing unit just drops to the target temperature T0, that is, when the actual outlet water temperature T1 reaches the target temperature T0 again, the increase in the flow output of the booster pump 110 stops. After the increase stops, the booster pump 110 continues to output water at the current flow rate until the user stops taking water.

[0099] It is worth noting that in this application, before the control unit 70 adjusts the flow output of the booster pump 110, the actual outlet water temperature of the mixing unit has stabilized at the target temperature T0, and the actual outlet flow rate of the hot water outlet circuit and the cold water pump 210 has stabilized at the preset flow threshold S0. When adjusting the flow output of the booster pump 110, if the actual outlet flow rate of the cold water pump 210 is less than the preset flow threshold S0, it indicates that the booster pump 110 cannot meet the flow rate required by the cold water pump 210, and at this time the actual outlet water temperature T1 of the mixing unit will be higher than the target temperature T0; if the actual outlet flow rate of the cold water pump 210 is equal to the preset flow threshold S0, it indicates that the booster pump 110 can meet the flow rate required by the cold water pump 210, and at this time the actual outlet water temperature T1 of the mixing unit will be equal to the target temperature T0.

[0100] In this embodiment, when the flow rate of the booster pump 110 is stopped from being adjusted, there is almost no backflow water or only a very small amount of backflow water in the return water path 40. At the same time, the actual outlet water temperature T1 and the actual outlet water flow rate of the mixing unit 20 can meet the user's water intake requirements. It can be seen that by adjusting the booster pump 110 to operate at the minimum flow rate, the user's water intake needs are met while the pre-membrane pressure of the RO filter element in the water purification unit 10 is reduced, the overall power and cost are reduced, the vibration of the water purification unit 10 during water production is significantly reduced, the noise during use is reduced, and the service life and filtration efficiency of the RO filter element are increased, improving the user experience.

[0101] In one specific embodiment of this example, when the booster pump is being adjusted, if the actual outlet water temperature T1 is detected to be equal to the target temperature T0 during the process of gradually increasing the flow rate output, the flow rate output of the booster pump is then controlled again by first gradually decreasing and then gradually increasing. By controlling the booster pump through this cyclic adjustment method, the flow rate and outlet water temperature are satisfied while minimizing the flow rate output of the booster pump, making the adjustment result more accurate. Alternatively, in another embodiment, if the temperature difference between the actual outlet water temperature T1 and the target temperature T0 is detected to be within a certain range, such as ±1℃, that is, the actual outlet water temperature T1 is approximately equal to the target temperature, the outlet water flow rate and outlet water temperature are approximately in line with the user's needs, and the adjustment process of the booster pump can be completed with only a single control, reducing the overall machine working time and speeding up the single water production and output speed.

[0102] During the aforementioned booster pump adjustment process, when the actual outlet water temperature T1 is maintained at the target temperature T0, the current duty cycle of the booster pump 110 can be recorded as the final duty cycle P3, which is used to drive the booster pump 110 and is associated with the target temperature T0. This association can be used for the user's next water intake. When the user selects the same target temperature T0 as the outlet water temperature for this water intake, the duty cycle can be directly used as the flow output of the booster pump 100, eliminating other steps. Only the flow output of the cold water pump 210 and the heating power of the heating unit 220 need to be adjusted.

[0103] In one embodiment, the control unit 70 can reduce the flow output of the booster pump 110 by decreasing its rotational speed; conversely, the control unit 70 can increase the flow output of the booster pump 110 by increasing its rotational speed. Specifically, the control unit 70 controls the rotational speed of the booster pump 110 primarily by sending a drive signal to the booster pump 110. When it is necessary to decrease the rotational speed of the booster pump 110, the control unit 70 can decrease the duty cycle of the drive signal. When it is necessary to increase the rotational speed of the booster pump 110, the control unit 70 can increase the duty cycle of the drive signal.

[0104] The apparatuses and methods disclosed in the several embodiments provided in this application can also be implemented in other ways. The apparatus embodiments described above are merely illustrative. For example, the flowcharts and block diagrams in the accompanying drawings illustrate the architecture, functionality, and operation of possible implementations of apparatuses, methods, and computer program products according to various embodiments of this application. In this regard, each block in a flowchart or block diagram may represent a module, segment, or portion of code, which contains one or more executable instructions for implementing a specified logical function. In some alternative implementations, the functions marked in the blocks may occur in a different order than those marked in the drawings. For example, two consecutive blocks may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. It should also be noted that each block in a block diagram and / or flowchart, and combinations of blocks in block diagrams and / or flowcharts, can be implemented using a dedicated hardware-based system that performs the specified function or action, or using a combination of dedicated hardware and computer instructions.

[0105] In addition, the functional modules in the various embodiments of this application can be integrated together to form an independent part, or each module can exist independently, or two or more modules can be integrated to form an independent part.

[0106] If a function is implemented as a software module and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or a portion of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods in the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as a USB flash drive, a portable hard drive, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk. The aforementioned memory 73 can be implemented by any type of volatile or non-volatile storage device or a combination thereof, such as Static Random Access Memory (SRAM), Electrically Erasable Programmable Read-Only Memory (EEPROM), Erasable Programmable Read Only Memory (EPROM), Programmable Red-Only Memory (PROM), Read-Only Memory (ROM), magnetic storage, flash memory, magnetic disk, or optical disk.

Claims

1. A control method of a water purification device, the water purification device being provided with a water purification unit, a water mixing unit and a water outlet unit, the water mixing unit comprising a cold water pump and a heating unit, the water purification unit comprising a booster pump, a backflow water path being provided between a water outlet end of the water purification unit and a water inlet end of the water purification unit; characterized in that the control method of the water purification device comprising: a pre-adjustment stage: receiving a water taking instruction of a user, detecting and obtaining a real-time flow S1 of the cold water pump, and adjusting a flow output of the booster pump according to a comparison result of the real-time flow S1 and a preset flow threshold S0; a temperature adjustment stage: adjusting a power output of the heating unit and / or a flow output of the cold water pump, so that an actual water outlet temperature T1 of the water mixing unit reaches a target temperature T0 indicated by the water taking instruction; a backflow adjustment stage: adjusting the flow output of the booster pump according to the current actual water outlet temperature T1, and keeping the flow output of the booster pump until the user stops taking water when the actual water outlet temperature T1 reaches the target temperature T0 again; adjusting the flow output of the booster pump according to the current actual water outlet temperature T1, comprising: when the actual water outlet temperature T1 is stable at the target temperature T0, gradually reducing the flow output of the booster pump, and the actual water outlet temperature T1 remains unchanged; continuously detecting the actual water outlet temperature T1, and obtaining a comparison result of the actual water outlet temperature T1 and the target temperature T0, and gradually increasing the flow output of the booster pump when it is detected that the actual water outlet temperature T1 is greater than the target temperature T0, so that the actual water outlet temperature T1 reaches the target temperature T0 again.

2. The control method of the water purifying apparatus according to claim 1, characterized by, adjusting the flow output of the booster pump according to the comparison result of the real-time flow S1 and the preset flow threshold S0, comprising: gradually reducing the flow output of the booster pump until a difference between the real-time flow S1 and the preset flow threshold S0 meets a preset range, and recording a current flow of the booster pump as a reference flow S; gradually increasing the flow output of the booster pump until a flow multiple between a current water outlet flow S2 of the booster pump and the reference flow S is equal to a preset adjustment coefficient.

3. The control method of the water purifying apparatus according to claim 2, characterized by, when the difference between the real-time flow S1 and the preset flow threshold S0 meets the preset range, recording a current duty cycle of the booster pump as a reference duty cycle P0; and when the flow multiple between the current water outlet flow S2 of the booster pump and the reference flow S is equal to the preset adjustment coefficient, recording a current duty cycle of the booster pump as an initial duty cycle P1.

4. The control method of the water purifying apparatus according to any one of claims 1 to 3, characterized by the method for obtaining the preset flow threshold S0 is: after the water purification device is powered on, the cold water pump and the booster pump are started at a rated voltage, and after the cold water pump continuously works for a preset time length, a current flow output of the cold water pump is recorded as the preset flow threshold S0, which is used to adjust the flow output of the booster pump.

5. The control method of the water purifying apparatus according to claim 1, wherein in the temperature adjustment stage, a theoretical water outlet flow S3 of the cold water pump is calculated according to the target temperature T0, an inlet water temperature T2 and a rated heating power P of the heating unit; a temperature adjustment mode is determined according to the theoretical water outlet flow S3 of the cold water pump and the preset flow threshold S0, and the power output of the heating unit and / or the flow output of the cold water pump are adjusted.

6. The control method of the water purifying apparatus according to claim 5, wherein Determine a temperature adjustment mode according to the theoretical water outlet flow S3 of the cold water pump and the preset flow threshold S0, including: Compare the theoretical water outlet flow S3 with the preset flow threshold S0; If the theoretical water outlet flow S3 is greater than or equal to the preset flow threshold S0, the temperature adjustment mode is to control the cold water pump to output water at the preset flow threshold S0, and adjust the heating power of the heating unit; If the theoretical water outlet flow S3 is less than the preset flow threshold S0, the temperature adjustment mode is to control the heating unit to operate at rated heating power P, and adjust the real-time flow S1 of the cold water pump.

7. The control method of the water purifying apparatus according to claim 6, characterized by, The temperature adjustment mode specifically includes: Detect the actual water outlet temperature T1 of the mixing unit, when the actual water outlet temperature T1 is greater than the target temperature T0, reduce the heating power of the heating unit or increase the real-time flow S1 of the cold water pump; when the actual water outlet temperature T1 is less than the target temperature T0, increase the heating power of the heating unit or decrease the real-time flow S1 of the cold water pump.

8. The control method of the water purifying apparatus according to claim 1, wherein In the adjusting step of the booster pump, if the actual water outlet temperature T1 is detected to be equal to the target temperature T0 in the process of gradually increasing the flow output, then the flow output of the booster pump is controlled again in the manner of gradually decreasing first and then gradually increasing, and the control is performed in a cyclic adjustment manner.

9. The control method of the water purifying apparatus according to claim 1 or 8, characterized by, When the actual water outlet temperature T1 is maintained at the target temperature T0, record the current duty cycle of the booster pump as the final duty cycle P3, and associate it with the target temperature T0.

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