Method for preventing water purification system from freezing and water purification system

Abstract

The application discloses a kind of freeze crack prevention methods of water purification system and water purification system, the freeze crack prevention method of water purification system includes: the water purification system includes reverse osmosis filter element, water inlet pipe, pure water pipe, wastewater pipe, prefilter, water inlet valve, the freeze crack prevention method includes: obtaining the water temperature of water in the prefilter;Determine that the water temperature is less than or equal to preset temperature value;Start freeze crack prevention mode.According to the freeze crack prevention method of water purification system of the application, by obtaining the water temperature of water in the prefilter, and when the water temperature is less than or equal to preset temperature value, start freeze crack prevention mode, to avoid the freeze crack of prefilter caused by the solidification of water in prefilter and the volume expansion of it, and further ensure the reliability and safety of water purification system.

Description

Technical Field

[0001] This invention relates to the field of household appliance technology, and in particular to a method for preventing freezing and cracking of a water purification system and the water purification system thereof. Background Technology

[0002] Most existing water purification systems are reverse osmosis systems, with the initial filtration unit being a pre-filter. When the water purification system is in standby mode, the pre-filter stores some water. When the temperature drops to freezing point, the stagnant water in the pre-filter gradually freezes and expands in volume, causing the pre-filter to crack and affecting the entire water purification system. Summary of the Invention

[0003] This invention aims to at least solve one of the technical problems existing in the prior art. To this end, this invention proposes a method for preventing the freezing and cracking of a water purification system, which can prevent the pre-filter from freezing and cracking at low temperatures.

[0004] The present invention also proposes a water purification system, which includes the above-described method for preventing freezing and cracking of the water purification system.

[0005] According to an embodiment of the present invention, a method for preventing freezing and cracking of a water purification system includes a reverse osmosis filter element, an inlet pipe, a pure water pipe, a wastewater pipe, a pre-filter element, and an inlet valve. The reverse osmosis filter element has a raw water inlet, a pure water outlet, and a wastewater outlet. One end of the inlet pipe is connected to the raw water inlet, and the other end is connected to a water source. The pure water pipe is connected to the pure water outlet, and the wastewater pipe is connected to the wastewater outlet. A wastewater valve is provided on the wastewater pipe. The pre-filter element is connected in series with the inlet pipe. The inlet valve is located on the inlet pipe to control the opening and closing of the inlet pipe. The inlet valve is located between the pre-filter element and the raw water inlet.

[0006] The method for preventing frost cracking includes:

[0007] Obtain the water temperature inside the pre-filter;

[0008] The water temperature is determined to be less than or equal to a preset temperature value;

[0009] Turn on anti-freeze crack mode.

[0010] According to the water purification system anti-freezing and cracking method of the present invention, the water temperature in the pre-filter is obtained, and the anti-freezing and cracking mode is activated when the water temperature is less than or equal to a preset temperature value, thereby avoiding the water in the pre-filter from freezing and expanding in volume, which would cause the pre-filter to freeze and crack, thus ensuring the reliability and safety of the water purification system.

[0011] In some embodiments of the present invention, the preset temperature value is 0-10℃.

[0012] In some embodiments of the present invention, activating the anti-freeze cracking mode includes: controlling the water flow in the pre-filter or reducing the volume of water stored in the pre-filter.

[0013] In some embodiments of the present invention, controlling the water flow within the pre-filter or reducing the volume of water stored in the pre-filter includes:

[0014] The inlet valve and the wastewater valve are opened and then closed after a first preset time.

[0015] The steps of opening the water inlet valve and the wastewater valve are repeated every second preset time interval.

[0016] In some embodiments of the present invention, the first preset time is 1-60 seconds.

[0017] In some embodiments of the present invention, the second preset time is 10-120 min.

[0018] In some embodiments of the present invention, a booster pump is connected in series on the water inlet pipe, and controlling the water flow in the pre-filter or reducing the volume of water stored in the pre-filter further includes: turning on the booster pump while opening the water inlet valve and the wastewater valve.

[0019] In some embodiments of the present invention, a main water inlet switch is provided between the water inlet pipe and the water source. After the water inlet valve and the wastewater valve are opened and then closed after a first preset time, the anti-freezing and cracking method further includes:

[0020] Determine whether the main water inlet switch is closed;

[0021] If not closed, the steps of opening the inlet valve and the wastewater valve will be repeated every second preset time interval;

[0022] If turned off, it will be in standby mode.

[0023] In some embodiments of the present invention, the water purification system further includes a return water pipe, one end of which is connected to the pure water pipe, and the other end of which is connected to the inlet water pipe. The connection point between the return water pipe and the inlet water pipe is located on the side of the inlet valve closer to the raw water inlet. A return water valve is provided on the return water pipe.

[0024] Controlling the water flow within the pre-filter or reducing the volume of water stored in the pre-filter includes:

[0025] The inlet valve and the return valve are opened and then closed after a third preset time.

[0026] The process of opening the inlet valve and closing the wastewater valve every fourth preset time interval is repeated after a fifth preset time interval.

[0027] In some embodiments of the present invention, the third preset time is 1-300s.

[0028] In some embodiments of the present invention, the fourth preset time is 10-120 min.

[0029] In some embodiments of the present invention, a booster pump is connected in series on the water inlet pipe, and controlling the water flow in the pre-filter or reducing the volume of water stored in the pre-filter further includes: turning on the booster pump while opening the water inlet valve and the water return valve, and turning on the booster pump while opening the water inlet valve and the wastewater valve.

[0030] In some embodiments of the present invention, a main water inlet switch is provided between the water inlet pipe and the water source. After the water inlet valve and the return valve are opened and then closed after a third preset time, the anti-freezing and cracking method further includes:

[0031] Determine whether the main water inlet switch is closed;

[0032] If not closed, the steps of opening the inlet valve and closing the wastewater valve after a fifth preset time are repeated every fourth preset time.

[0033] If turned off, it will be in standby mode.

[0034] A water purification system according to some embodiments of the present invention includes the above-described antifreeze cracking method, and further includes:

[0035] A reverse osmosis filter element, wherein the reverse osmosis filter element has a raw water inlet, a pure water outlet and a wastewater outlet;

[0036] The system includes an inlet pipe, a pure water pipe, and a wastewater pipe. One end of the inlet pipe is connected to the raw water inlet, and the other end is connected to a water source. The pure water pipe is connected to the pure water outlet, and the wastewater pipe is connected to the wastewater outlet. A wastewater valve is provided on the wastewater pipe.

[0037] A pre-filter element, which is connected in series to the water inlet pipe;

[0038] An inlet valve is provided on the inlet pipe to control the opening and closing of the inlet pipe. The inlet valve is located between the pre-filter and the raw water inlet.

[0039] A temperature detection device is provided on the water inlet pipe and located on the side of the water inlet valve away from the raw water inlet, or on the pre-filter element, for detecting water temperature.

[0040] According to the water purification system of the present invention, by setting the above-mentioned anti-freezing and cracking method, the anti-freezing and cracking mode is activated when the water temperature in the pre-filter is obtained and the water temperature is less than or equal to a preset temperature value, thereby avoiding the water in the pre-filter from freezing and expanding in volume, which would cause the pre-filter to freeze and crack, thus ensuring the reliability and safety of the water purification system.

[0041] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0042] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0043] Figure 1 This is a schematic diagram of a water purification system according to an embodiment of the present invention;

[0044] Figure 2 This is a schematic diagram of a water purification system according to another embodiment of the present invention;

[0045] Figure 3 This is a schematic diagram of a water purification system according to yet another embodiment of the present invention;

[0046] Figure 4 This is a flowchart of a method for preventing freezing and cracking of a water purification system according to an embodiment of the present invention.

[0047] Figure label:

[0048] 100. Water purification system;

[0049] 1. Reverse osmosis filter element; 11. Raw water inlet; 12. Pure water outlet; 13. Wastewater outlet;

[0050] 2. Water inlet pipe; 21. Water inlet valve; 22. Booster pump;

[0051] 3. Pure water pipe;

[0052] 4. Wastewater pipe; 41. Wastewater valve;

[0053] 5. Pre-filter;

[0054] 6. Temperature detection device;

[0055] 7. TDS detection device;

[0056] 8. Return water pipe; 81. Return water valve;

[0057] 9. Post-filter. Detailed Implementation

[0058] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0059] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, features defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0060] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0061] The following description, with reference to the accompanying drawings, illustrates an embodiment of the water purification system 100 and a method for preventing the water purification system 100 from freezing and cracking.

[0062] like Figures 1-3 As shown, a water purification system 100 according to an embodiment of the present invention includes a reverse osmosis filter element 1, an inlet pipe 2, a pure water pipe 3, a wastewater pipe 4, a pre-filter element 5, and an inlet valve 21.

[0063] Specifically, the reverse osmosis filter element 1 has a raw water inlet 11, a pure water outlet 12, and a wastewater outlet 13. One end of the inlet pipe 2 is connected to the raw water inlet 11, and the other end is connected to a water source. The pure water pipe 3 is connected to the pure water outlet 12, and the wastewater pipe 4 is connected to the wastewater outlet 13. It can be understood that the raw water in the inlet pipe 2 enters the reverse osmosis filter element 1 for treatment through the raw water inlet 11. The generated pure water flows out through the pure water outlet 12 and the pure water pipe 3 for user use, while the wastewater is discharged through the wastewater outlet 13 and the wastewater pipe 4.

[0064] Wastewater valve 41 is installed on wastewater pipe 4. It is understood that when wastewater valve 41 is open, the pressure inside wastewater pipe 4 increases, increasing the wastewater discharge rate and volume of reverse osmosis filter element 1. By controlling wastewater valve 41, the entire water purification system 100 can be drained through wastewater pipe 4, thus cleaning the system. Furthermore, when implementing anti-freezing measures, controlling wastewater valve 41 allows for the drainage of water from pre-filter element 5 through wastewater pipe 4, providing sufficient space for the water to solidify and preventing the pre-filter element 5 from cracking. It should be noted that when wastewater valve 41 is closed, a small amount of wastewater still flows through wastewater outlet 12, allowing it to be discharged into the sewer through wastewater pipe 4; when wastewater valve 41 is fully open, virtually no water flows out of pure water outlet 12.

[0065] The pre-filter element 5 is connected in series with the inlet pipe 2. The pre-filter element 5 is located between the reverse osmosis filter element 1 and the main inlet water (the end of the inlet pipe 2 connected to the water source), and is used for pre-filtration of the water entering the water purification system 100. It mainly removes rust, sediment, and adsorbs discoloration, odors, residual chlorine, and some organic matter in the water, further ensuring the water purification effect of the water purification system 100. Optionally, the pre-filter element 5 can be a PP cotton filter element, a carbon rod filter element, or a pre-filter FPC / PAC filter element, etc.

[0066] An inlet valve 21 is installed on the inlet pipe 2 to control the opening and closing of the inlet pipe 2. The inlet valve 21 is located between the pre-filter cartridge 5 and the raw water inlet 11. When the water purification system 100 is preparing pure water, the inlet valve 21 is in the open state, and the raw water treated by the pre-filter cartridge 5 enters the reverse osmosis filter cartridge 1 for further treatment through the raw water inlet 11. When the water purification system 100 is in standby mode, the inlet valve 21 can be in the closed state. Optionally, the inlet valve 21 can be a solenoid valve or a manually operated mechanical valve.

[0067] Furthermore, a post-filter element 9 is connected in series to the pure water pipe 3 of the water purification system 100. Specifically, the post-filter element 9 has an inlet end and an outlet end. The pure water produced by the reverse osmosis filter element 1 flows out from the pure water outlet 12, passes through the pure water pipe 3, enters the post-filter element 9 through the inlet end of the post-filter element, is filtered again, and then flows out from the outlet end of the post-filter element 9 and out through the pure water pipe 3, becoming drinking water. By connecting the post-filter element 9 in series to the pure water pipe 3, the water purification and filtration effect of the water purification system 100 is improved.

[0068] like Figure 4 As shown, the method for preventing the water purification system 100 from freezing and cracking according to an embodiment of the present invention includes:

[0069] S1: Obtaining the water temperature inside the pre-filter cartridge 5: The water temperature inside the pre-filter cartridge 5 can be obtained through a temperature detection device 6. Specifically, the temperature detection device 6 can be installed on the inlet pipe 2 and located on the side of the pre-filter cartridge 5 away from the inlet valve 21, or it can be installed on the pre-filter cartridge 5. In this case, the temperature of the water in the inlet pipe 2 located on the side of the inlet valve 21 away from the raw water inlet 11 is approximately the same as the temperature of the water accumulated in the pre-filter cartridge 5. The temperature detection device 6 can also be installed between the pre-filter cartridge 5 and the inlet valve 21, so that the temperature detection device 6 is located inside the water purification system 100, thereby protecting the temperature detection device 6 and increasing the service life of the water purification system 100.

[0070] Preferably, the temperature detection device 6 is a temperature sensor, which can obtain the actual water temperature in the pre-filter 5 in real time. Of course, other forms of temperature detection device 6 are also possible, and no specific limitation is made here, as long as they can detect the water temperature in the pre-filter 5.

[0071] S2: Determine whether the water temperature data obtained in step S1 for the water in the pre-filter cartridge 5 is less than or equal to a preset temperature value, and confirm that the water temperature is less than or equal to the preset temperature value; wherein, the preset temperature value is the temperature at which the water in the pre-filter cartridge 5 is prone to condensation. Optionally, the preset temperature value can be a single temperature value or a temperature range. It can be understood that when the water purification system 100 is in standby mode, it determines whether to activate the anti-freeze mode by comparing the water temperature in the pre-filter cartridge 5 with the preset temperature value.

[0072] S3: Activate the anti-freeze / crack mode. When the water temperature is determined to be less than or equal to a preset temperature value in step S2, the anti-freeze / crack mode is activated. This mode is used to prevent the pre-filter element 5 from freezing and cracking due to the expansion of water within it. It should be noted that the method for activating the anti-freeze / crack mode will be specifically described in subsequent embodiments.

[0073] According to the anti-freezing and cracking method of the water purification system 100 of the present invention, the water temperature in the pre-filter 5 is obtained, and the anti-freezing and cracking mode is activated when the water temperature is less than or equal to a preset temperature value, thereby preventing the water in the pre-filter 5 from freezing and expanding in volume, which would cause the pre-filter 5 to freeze and crack, thereby ensuring the reliability and safety of the water purification system 100.

[0074] In some embodiments of the present invention, the preset temperature value is 0-10℃. Specifically, the front end of the pre-filter 5 is connected to the main water inlet switch, and the rear end is connected to the water inlet valve 21. When the water purification system 100 is in standby mode, the water inlet valve 21 is closed, and some water will be stored in the pre-filter 5. When the temperature drops, the water in the pre-filter 5 will gradually solidify and expand in volume, causing the pre-filter 5 to freeze and crack. This determines that the water temperature in the pre-filter 5 is preferably higher than 0-10℃, for example, the preset temperature value is 1℃, 2℃, 3℃, 4℃, 5℃, 6℃, 7℃, 8℃ or 9℃.

[0075] In one specific embodiment, when the water purification system 100 is in standby mode, the water temperature inside the pre-filter 5 can be obtained through the temperature detection device 6. When the water temperature inside the pre-filter 5 is less than or equal to 1°C, the anti-freeze and cracking mode is activated to prevent the pre-filter 5 from freezing and cracking.

[0076] In some embodiments of the present invention, activating the anti-freeze-crack mode includes controlling the water flow within the pre-filter cartridge 5 or reducing the volume of water stored in the pre-filter cartridge 5. Activating the anti-freeze-crack mode can slow down the freezing process of the pre-filter cartridge 5 by controlling the water flow within it, thereby preventing the pre-filter cartridge 5 from freezing and cracking. Specifically, water flow can be achieved by controlling part or all of the devices in the water purification system 100, thereby providing a path for the water in the pre-filter cartridge 5 and enabling water flow within the pre-filter cartridge 5. Activating the anti-freeze-crack mode can also reduce the volume of water stored in the pre-filter cartridge 5, ensuring sufficient space for the water to solidify and preventing the outer shell of the pre-filter cartridge 5 from cracking.

[0077] In some embodiments of the present invention, controlling the water flow within the pre-filter 5 or reducing the volume of water stored in the pre-filter 5 includes:

[0078] After the inlet valve 21 and wastewater valve 41 are opened for a first preset time, they are closed. When the inlet valve 21 and wastewater valve 41 are opened, the water in the pre-filter 5 enters the reverse osmosis filter 1 through the inlet pipe 2, the inlet valve 21, and the raw water inlet 11. Then, it is discharged into the sewer through the wastewater outlet 13 and the wastewater valve 41 and the wastewater pipe 4. After the first preset time, the inlet valve 21 and wastewater valve 41 are closed, thereby controlling the water flow in the pre-filter 5 or reducing the volume of water stored in the pre-filter 5, thus preventing the pre-filter 5 from freezing and cracking.

[0079] The process of opening and closing the inlet valve 21 and wastewater valve 41 is repeated every second preset time interval. Specifically, after opening and closing the inlet valve 21 and wastewater valve 41 for a first preset time, the process repeats every second preset time interval. This means that when the anti-freeze / crack mode is activated, the inlet valve 21 and wastewater valve 41 are first opened and then closed. After a second preset time interval following the opening of the inlet valve 21 and wastewater valve 41, the process repeats, opening and closing the inlet valve 21 and wastewater valve 41 for the first preset time interval. Then, after the previous second preset time interval following the opening of the inlet valve 21 and wastewater valve 41, the process repeats again, until the water temperature inside the pre-filter 5 exceeds a preset temperature value, at which point the purification system 100 exits the anti-freeze / crack mode. Through the above steps, the water flow in the pre-filter 5 can be controlled or the volume of water stored in the pre-filter 5 can be reduced, thereby preventing the pre-filter 5 from freezing and cracking, which would affect the water purification system 100.

[0080] In some embodiments of the present invention, the first preset time is 1-60s. Specifically, when the water temperature in the pre-filter 5 is determined to be less than or equal to a preset temperature value through the preceding steps, the anti-freeze-crack mode is activated, that is, the inlet valve 21 and the wastewater valve 41 are opened for 1-60s and then closed. Then, the inlet valve 21 and the wastewater valve 41 are opened and closed again every second preset time interval, so as to realize the water flow in the pre-filter 5 or reduce the volume of water stored in the pre-filter 5, thereby preventing the pre-filter 5 from freezing and cracking. During this process, the water in the pre-filter 5 enters the reverse osmosis filter 1 through the inlet pipe 2, the inlet valve 21, and the raw water inlet 11, and then is discharged into the sewer through the wastewater outlet 13 and the wastewater valve 41 through the wastewater pipe 4. In order to discharge as much water as possible from the pre-filter 5, the first preset time is preferably 1-60s, for example, the first preset time is 5s, 10s, 20s, 30s, 40s, 50s or 55s.

[0081] In one specific embodiment, when the water temperature in the pre-filter 5 is less than or equal to a preset temperature, the inlet valve 21 and the wastewater valve 41 are opened for 30 seconds and then closed. The inlet valve 21 and the wastewater valve 41 are opened and closed again after a second preset time interval, thereby realizing the flow of water in the pre-filter 5 or reducing the volume of water stored in the pre-filter 5, and preventing the pre-filter 5 from freezing and cracking.

[0082] In some embodiments of the present invention, the aforementioned second preset time is 10-120 minutes. Specifically, when the anti-freeze-crack mode is activated, after opening and closing the inlet valve 21 and wastewater valve 41 for a first preset time, the step of opening and closing the inlet valve 21 and wastewater valve 41 for a first preset time is repeated every 10-120 minutes. This allows water to flow within the pre-filter element 5 or reduces the volume of water stored in the pre-filter element 5, thereby preventing the pre-filter element 5 from freezing and cracking. It is understood that if the interval between opening and closing the inlet valve 21 and wastewater valve 41 for a first preset time is too long, some water within the water purification system 100 may solidify, thereby reducing water flow and increasing the possibility of the pre-filter element 5 freezing and cracking. Therefore, the first preset time is preferably 10-120 minutes, for example, 20 minutes, 30 minutes, 60 minutes, 90 minutes, or 100 minutes.

[0083] In one specific embodiment, after the inlet valve 21 and the wastewater valve 41 are opened and closed for a first preset time, the inlet valve 21 and the wastewater valve 41 are opened and closed again every 30 minutes, thereby enabling water to flow in the pre-filter element 5 or reducing the volume of water stored in the pre-filter element 5, and preventing the pre-filter element 5 from freezing and cracking.

[0084] In some embodiments of the present invention, a booster pump 22 is connected in series to the inlet pipe 2 of the water purification system 100. The booster pump 22 is connected in series to the inlet pipe 2 to pressurize the raw water in the inlet pipe 2. Specifically, when the user uses the water purification system 100, the booster pump 22 drives the raw water in the inlet pipe 2 to flow into the reverse osmosis filter element 1, and at the same time increases the raw water pressure in the inlet pipe 2 to ensure that the raw water pressure flowing into the reverse osmosis filter element 1 is high enough, thereby ensuring that the water purification system 100 can normally produce pure water. When the anti-freeze mode is turned on, the booster pump 22 can drive the water in the pre-filter element 5 into the reverse osmosis filter element 1 and then discharge it through the wastewater outlet 13 and the wastewater pipe 4, thereby increasing the flow of water in the water purification system 100 and thus preventing the pre-filter element 5 from freezing and cracking.

[0085] Furthermore, the booster pump 22 is located between the inlet valve 21 and the raw water inlet 11. The inlet end of the booster pump 22 is connected to the inlet valve 21, and the outlet end is connected to the raw water inlet 11. This allows the raw water to be pressurized by the booster pump 22 and enter the reverse osmosis filter element 1 through the raw water inlet 11, ensuring the speed at which the water purification system 100 produces pure water. Simultaneously, it ensures the flow of water within the water purification system 100 during standby, ensuring the implementation of the anti-freeze / crack mode. This positioning also allows the water entering the booster pump 22 to be filtered by the pre-filter element 5, effectively preventing impurities such as sediment from clogging or damaging the booster pump 22, thus improving its operating performance and service life.

[0086] Optionally, the aforementioned booster pump 22 can be a variable frequency booster pump, whose speed can be adjusted according to different user needs. When the water purification system 100 produces pure water, the speed of the variable frequency booster pump increases, and the amount of water passing through the booster pump in the same time increases, thereby increasing the amount of raw water entering the reverse osmosis filter element 1, and thus increasing the speed of pure water production by the water purification system 100. When the anti-freeze mode is executed, the speed of the variable frequency booster pump can be reduced compared to when producing pure water, saving electricity while ensuring water flow.

[0087] Optionally, controlling the water flow within the pre-filter 5 or reducing the volume of water stored in the pre-filter 5 also includes:

[0088] The booster pump 22 is turned on simultaneously with the inlet valve 21 and the wastewater valve 41. Specifically, when the anti-freeze / crack mode is activated, the booster pump 22 is turned on simultaneously with the inlet valve 21 and the wastewater valve 41, and then turned off after a first preset time. That is, the water in the pre-filter 5, driven by the booster pump 22, flows through the inlet pipe 2, sequentially through the inlet valve 21, the booster pump 22, and the raw water inlet 11 into the reverse osmosis filter 1, and then flows through the wastewater outlet 13 and the wastewater valve 41 into the sewer through the wastewater pipe 4. This controls the water flow within the pre-filter 5 or reduces the volume of water stored in the pre-filter 5, thereby preventing the pre-filter 5 from freezing and cracking. Then, at every second preset time interval, the inlet valve 21 and the wastewater valve 41 are opened again, and the booster pump 22 is turned on. Under the action of the booster pump 22, the water in the pre-filter 5 is allowed to flow or the volume of water stored in the pre-filter 5 is reduced, thereby preventing the pre-filter 5 from freezing and cracking, which would affect the water purification system 100.

[0089] In some embodiments of the present invention, a main water inlet switch is provided between the water inlet pipe 2 and the water source. Specifically, one end of the main water inlet switch is connected to the water source, and the other end is connected to the water inlet pipe 2. The main water inlet switch is used to control whether the water source flows into the water purification system 100. When the main water inlet switch is open, raw water enters the water purification system 100 through the water inlet pipe 2, and after being filtered by a series of devices, pure water is generated for user use. Optionally, the main water inlet switch can be a manual mechanical valve or a solenoid valve.

[0090] Optionally, after the inlet valve 21 and the wastewater valve 41 are opened and then closed after a first preset time, the anti-freezing and cracking method further includes:

[0091] Determine whether the main water inlet switch is closed; after the water inlet valve 21 and wastewater valve 41 are opened and closed after a first preset time, determine the subsequent steps of the anti-freeze and cracking mode based on the state of the main water inlet switch.

[0092] Specifically, a TDS (Total Dissolved Solids) detection device 7 can be installed on the inlet pipe 2, on the side of the inlet valve 21 furthest from the raw water inlet 11. The difference between the TDS values ​​measured by the TDS detection device 7 at different times determines whether the main water inlet switch is closed. The TDS detection device 7 is used to detect the TDS value of the water in the inlet pipe 2. When the main water inlet switch is open, raw water flows into the raw water inlet 11 through the inlet pipe 2. At this time, the TDS value detected by the TDS detection device 7 is the TDS value of the raw water. When the difference between the TDS value detected by the TDS detection device 7 and the raw water TDS value at a certain time is higher than a preset TDS value, it is determined that the main water inlet switch is closed.

[0093] Optionally, the TDS detection device 7 is located on the side of the pre-filter 5 furthest from the inlet valve 21. In this case, the TDS value detected by the TDS detection device 7 is the TDS value of the tap water that has not been filtered by the pre-filter 5. This setting makes the detected TDS value difference more accurate. Of course, the location of the TDS detection device 7 is not limited to this. It can also be located between the pre-filter 5 and the inlet valve 21, or directly on the pre-filter 5, so that the TDS detection device 7 is located inside the water purification system 100, thereby protecting the TDS detection device 7 and increasing the service life of the water purification system 100.

[0094] Furthermore, the temperature detection device 6 and the TDS detection device 7 are integrated into one unit and installed on the inlet pipe 2. This allows for simultaneous detection of the inlet water temperature and TDS value, improving detection efficiency. This integrated design also effectively reduces the space occupied by separately installing the temperature detection device 6 and the TDS detection device 7, thus improving installation efficiency. Preferably, the integrated device is a temperature-TDS composite probe.

[0095] Depending on the source of the water, the preset TDS value is 20-300 ppm, for example, 30 ppm, 60 ppm, 100 ppm, 150 ppm, 200 ppm, 250 ppm, or 280 ppm. In a specific embodiment, the water source is tap water. When the main water inlet switch is turned on, tap water flows into the raw water inlet 11 through the inlet pipe 2. At this time, the TDS value detected by the TDS detection device 7 is 150 ppm. At a certain moment, the TDS value detected by the TDS detection device 7 is 50 ppm. At this time, the TDS difference is 100 ppm. Therefore, it can be determined that the main water inlet switch is in the closed state at a certain moment.

[0096] Of course, other judgment methods are also acceptable, and no specific restrictions are imposed here, as long as it can determine whether the main water inlet switch is in the open or closed state.

[0097] If the main water inlet switch is not closed, the steps of opening the inlet valve 21 and the wastewater valve 41 are repeated every second preset time interval. While the main water inlet switch is open, raw water continuously enters the water purification system 100 from the inlet pipe 2. Simply opening the inlet valve 21 and the wastewater valve 41 for the first preset time and then closing them only allows water to flow within the pre-filter cartridge 5; it does not reduce the volume of water in the pre-filter cartridge 5. Therefore, while the main water inlet switch is open, the inlet valve 21 and the wastewater valve 41 need to be opened repeatedly every second preset time interval to repeatedly create water flow within the pre-filter cartridge 5, slowing down the freezing process of the pre-filter cartridge 5 and thus preventing it from freezing and cracking.

[0098] If the main water inlet switch is closed, the system enters standby mode. The fact that the inlet valve 21 and wastewater valve 41 are opened and then closed after a first preset time in the previous steps reduces the volume of water stored in the pre-filter element 5, providing sufficient space for the water inside the pre-filter element 5 to solidify and preventing the outer shell of the pre-filter element 5 from cracking. Therefore, with the main water inlet switch closed, no raw water enters the pre-filter element 5 from the inlet pipe 2, and there is no need to reopen the inlet valve 21 and wastewater valve 41. In this state, the water purification system 100 can remain in standby mode to prevent the pre-filter element 5 from freezing and cracking.

[0099] Understandably, after activating the anti-freeze / crack mode, the inlet valve 21 and wastewater valve 41 are first forcibly opened for a first preset time and then closed. Then, depending on whether the main water inlet switch is closed, the system decides whether to repeat the process of opening and closing the inlet valve 21 and wastewater valve 41 every second preset time, or to leave the system in standby mode. This allows the system to determine subsequent steps based on whether the main water inlet switch is closed, avoiding the waste of electricity caused by reopening the inlet valve 21 and wastewater valve 41 after the water in the pre-filter element 5 has already been drained through them when the main water inlet switch is closed, thus improving the user experience.

[0100] The following will describe, by way of example, a method for preventing freezing and cracking of a water purification system 100 according to an embodiment of the present invention.

[0101] Implementation Method 1

[0102] The water temperature inside the pre-filter 5 is obtained; the water temperature inside the pre-filter 5 can be obtained through the temperature detection device 6.

[0103] Determine whether the water temperature data obtained in the pre-filter cartridge 5 is less than or equal to the preset temperature value, and confirm that the water temperature is less than or equal to the preset temperature value; wherein, the preset temperature value is the temperature at which the water in the pre-filter cartridge 5 is prone to solidification.

[0104] After the inlet valve 21 and wastewater valve 41 are opened for a first preset time, they are closed. Specifically, after the inlet valve 21 and wastewater valve 41 are opened, the water in the pre-filter 5 enters the reverse osmosis filter 1 through the inlet pipe 2, the inlet valve 21, and the raw water inlet 11, and then is discharged into the sewer through the wastewater outlet 13 and the wastewater valve 41 and the wastewater pipe 4. After the first preset time, the inlet valve 21 and wastewater valve 41 are closed.

[0105] Determine whether the main water inlet switch is closed; based on the state of the main water inlet switch, determine the subsequent steps for the anti-freeze cracking mode.

[0106] If not closed, the inlet valve 21 and wastewater valve 41 are repeatedly opened every second preset time interval. Specifically, with the main inlet switch open, raw water continuously enters the water purification system 100 from the inlet pipe 2. Therefore, the steps of repeatedly opening the inlet valve 21 and wastewater valve 41 every second preset time interval are necessary to repeatedly create water flow within the pre-filter element 5, slowing down the freezing process of the pre-filter element 5 and preventing it from freezing and cracking.

[0107] If closed, it will standby. Specifically, after the inlet valve 21 and wastewater valve 41 are opened for a first preset time in the previous steps, they are closed. With the main inlet switch closed, the volume of water stored in the pre-filter element 5 has been reduced, so that there is enough space for the water in the pre-filter element 5 to solidify, thus preventing the outer shell of the pre-filter element 5 from cracking.

[0108] Implementation Method 2

[0109] The water temperature inside the pre-filter 5 is obtained; the water temperature inside the pre-filter 5 can be obtained through the temperature detection device 6.

[0110] Determine whether the water temperature data obtained in the pre-filter cartridge 5 is less than or equal to the preset temperature value, and confirm that the water temperature is less than or equal to the preset temperature value; wherein, the preset temperature value is the temperature at which the water in the pre-filter cartridge 5 is prone to solidification.

[0111] After the inlet valve 21, wastewater valve 41, and booster pump 22 are opened for a first preset time, they are closed. Specifically, after the inlet valve 21, wastewater valve 41, and booster pump 22 are opened, the water in the pre-filter 5 is driven by the booster pump 22 and enters the reverse osmosis filter 1 through the inlet pipe 2, in sequence through the inlet valve 21 and the raw water inlet 11. Then, it is discharged into the sewer through the wastewater outlet 13 and the wastewater valve 41 through the wastewater pipe 4. After the first preset time, the inlet valve 21, wastewater valve 41, and booster pump 22 are closed.

[0112] Determine whether the main water inlet switch is closed; based on the state of the main water inlet switch, determine the subsequent steps for the anti-freeze cracking mode.

[0113] If not closed, the inlet valve 21, wastewater valve 41, and booster pump 22 are repeatedly opened every second preset time interval. When the main inlet switch is not closed, raw water continuously enters the water purification system 100 from the inlet pipe 2. Therefore, the steps of opening and closing the inlet valve 21, wastewater valve 41, and booster pump 22 need to be repeated every second preset time interval. This repeatedly creates water flow within the pre-filter element 5 under the drive of the booster pump 22, slowing down the freezing process of the pre-filter element 5 and preventing it from freezing and cracking.

[0114] If closed, it will standby. Specifically, after the inlet valve 21 and wastewater valve 41 are opened for a first preset time in the previous steps, they are closed. With the main inlet switch closed, the volume of water stored in the pre-filter element 5 has been reduced, so that there is enough space for the water in the pre-filter element 5 to solidify, thus preventing the outer shell of the pre-filter element 5 from cracking.

[0115] In some embodiments of the present invention, the water purification system 100 further includes a return water pipe 8, one end of which is connected to the pure water pipe 3, and the other end of which is connected to the inlet water pipe 2. The connection point between the return water pipe 8 and the inlet water pipe 2 is located on the side of the inlet water valve 21 near the raw water inlet 11. It can be understood that when the water purification system 100 is in standby mode, after the pure water flows out from the pure water outlet 12 of the reverse osmosis filter element 1, it flows through the pure water pipe 3 to the return water pipe 8, and then flows through the return water pipe 8 to the inlet water pipe 2 to mix with the raw water. This arrangement can drain the water in the reverse osmosis filter element 1 as much as possible, providing a path for the flow of water in the water purification system 100, thereby increasing the water flow rate and preventing the pre-filter element 5 from freezing and cracking.

[0116] A return water valve 81 is provided on the return water pipe 8. Specifically, the return water valve 81 is located between the pure water pipe 3 and the inlet water pipe 2. By setting the return water valve 81, the opening and closing of the return water pipe 8 can be controlled. That is, when the return water valve 81 is open, pure water flows out from the pure water outlet 12 of the reverse osmosis filter element 1 and then flows into the inlet water pipe 2 in sequence through the pure water pipe 3, the return water pipe 8, and the return water valve 81, thereby mixing with the raw water in the inlet water pipe 2 and providing a path for the flow of water in the water purification system 100.

[0117] Controlling the water flow within the pre-filter 5 or reducing the volume of water stored in the pre-filter 5 includes:

[0118] After the inlet valve 21 and return valve 81 are opened for a third preset time, they are closed. When the inlet valve 21 and return valve 81 are opened, the water in the pre-filter 5 enters the reverse osmosis filter 1 through the inlet pipe 2, in sequence through the inlet valve 21 and the raw water inlet 11. The water is then divided into a pure water stream and a wastewater stream. The wastewater flows out through the wastewater outlet 13 and is discharged into the sewer through the wastewater pipe 4. The pure water flows out through the pure water outlet 12 and flows through the pure water pipe 3 to the return pipe 8. It then flows back into the inlet pipe 2 and mixes with the raw water before entering the reverse osmosis filter 1 again. The process of pure water recirculation provides an outlet path for the water in the pre-filter 5, thereby discharging as much water as possible from the pre-filter 5 and the reverse osmosis filter 1. This controls the water flow in the pre-filter 5 or reduces the volume of water stored in the pre-filter 5, slows down the freezing process of the water in the pre-filter 5, and prevents the pre-filter 5 from freezing and cracking.

[0119] The process of opening and closing the inlet valve 21 and wastewater valve 41 for a fifth preset time is repeated every fourth preset time interval. This means that when the anti-freeze / crack mode is activated, the inlet valve 21 and return valve 81 are first opened for a third preset time and then closed. After a fourth preset time interval following the opening of inlet valve 21 and return valve 81, inlet valve 21 and wastewater valve 41 are opened for a fifth preset time and then closed. This process is repeated again after the previous fourth preset time interval following the opening of inlet valve 21 and wastewater valve 41, until the water temperature inside the pre-filter 5 exceeds a preset temperature value, at which point the water purification system 100 exits the anti-freeze / crack mode. After opening and closing inlet valve 21 and return valve 81 for a third preset time, this process is repeated every fourth preset time interval. Through the above steps, the water flow in the pre-filter 5 can be controlled or the volume of water stored in the pre-filter 5 can be reduced, thereby preventing the pre-filter 5 from freezing and cracking, which would affect the water purification system 100.

[0120] In some embodiments of the present invention, the aforementioned third preset time is 1-300s. Specifically, when the water temperature in the pre-filter 5 is determined to be less than or equal to a preset temperature through the preceding steps, the anti-freeze-crack mode is activated, that is, the inlet valve 21 and the return valve 81 are opened for 1-300s and then closed, so as to realize the flow of water in the pre-filter 5 or reduce the volume of water stored in the pre-filter 5, thereby preventing the pre-filter 5 from freezing and cracking. In this process, the water in the pre-filter 5 enters the reverse osmosis filter 1 through the inlet pipe 2, the inlet valve 21, and the raw water inlet 11 in sequence. The purified water flows through the purified water pipe 3 to the return pipe 8, and then flows back into the inlet pipe 2 to mix with the raw water and enter the reverse osmosis filter 1 again. The wastewater flows out through the wastewater outlet 13 and is discharged into the sewer through the wastewater pipe 4. In order to discharge as much water as possible from the pre-filter 5, the third preset time is preferably 1-300s. For example, the first preset time is 10s, 30s, 60s, 90s, 120s, 180s, 240s, or 290s. In a specific embodiment, when the water temperature in the pre-filter 5 is detected to be less than or equal to the preset temperature, the inlet valve 21 and the return valve 81 are opened for 120s and then closed.

[0121] In some embodiments of the present invention, the aforementioned fourth preset time is 10-120 minutes. Specifically, when the anti-freeze-crack mode is activated, after opening the inlet valve 21 and closing the return valve 81 after a third preset time, the step of opening the inlet valve 21 and closing the wastewater valve 41 after a fifth preset time is repeated every 10-120 minutes. This allows water to flow within the pre-filter element 5 or reduces the volume of water stored in the pre-filter element 5, thereby preventing the pre-filter element 5 from freezing and cracking. It is understood that if the interval between opening the inlet valve 21 and closing the wastewater valve 41 after the fifth preset time is too long, some water in the water purification system 100 may solidify, thereby reducing water flow and increasing the possibility of the pre-filter element 5 freezing and cracking. Therefore, the fourth preset time is preferably 10-120 minutes, for example, the first preset time is 20 minutes, 30 minutes, 60 minutes, 90 minutes, or 100 minutes.

[0122] In one specific embodiment, after the inlet valve 21 and the wastewater valve 41 are opened and closed after a third preset time, the inlet valve 21 and the wastewater valve 41 are opened and closed again after a fifth preset time every 30 minutes.

[0123] Furthermore, the aforementioned fifth preset time can be 1-60 seconds. Specifically, after opening the inlet valve 21 and closing the return valve 81 after the third preset time, the step of opening the inlet valve 21 and closing the wastewater valve 41 for 1-60 seconds is repeated every 10-120 minutes. In this process, the water in the pre-filter 5 enters the reverse osmosis filter 1 through the inlet pipe 2, the inlet valve 21, and the raw water inlet 11, and then is discharged into the sewer through the wastewater outlet 13 and the wastewater valve 41 via the wastewater pipe 4. In order to discharge as much water as possible from the pre-filter 5, the fifth preset time is preferably 1-60 seconds, for example, the fifth preset time is 5 seconds, 10 seconds, 20 seconds, 30 seconds, 40 seconds, 50 seconds, or 55 seconds. In one specific embodiment, the inlet valve 21 and the wastewater valve 41 are repeatedly opened for 1-60 seconds every 10-120 minutes and then closed, thereby enabling water flow in the pre-filter 5 or reducing the volume of water stored in the pre-filter 5, and preventing the pre-filter 5 from freezing and cracking.

[0124] In some embodiments of the present invention, a booster pump 22 is connected in series on the inlet pipe 2. The booster pump 22 is connected in series on the inlet pipe 2 to pressurize the raw water in the inlet pipe 2. Specifically, when the anti-freeze-crack mode is activated, the booster pump 22 can drive the water in the pre-filter 5 into the reverse osmosis filter 1 and then discharge it through the wastewater outlet 13 and the wastewater pipe 4, thereby improving the flowability of the water in the water purification system 100 and preventing the pre-filter 5 from freezing and cracking. Further, the booster pump 22 can be located between the inlet valve 21 and the raw water inlet 11. The specific beneficial effects of the booster pump 22 are similar to those of the booster pump 22 in the above embodiments, and will not be elaborated here.

[0125] Optionally, controlling the water flow in the pre-filter 5 or reducing the volume of water stored in the pre-filter 5 also includes turning on the booster pump 22 while opening the inlet valve 21 and the return valve 81, and turning on the booster pump 22 while opening the inlet valve 21 and the wastewater valve 41.

[0126] When the anti-freeze / crack mode is activated, the inlet valve 21 and return valve 81 are opened simultaneously with the booster pump 22. After a third preset time, the inlet valve 21, return valve 81, and booster pump 22 are closed. Specifically, water in the pre-filter 5, driven by the booster pump 22, flows through the inlet pipe 2, sequentially through the inlet valve 21, booster pump 22, and raw water inlet 11 into the reverse osmosis filter 1. Wastewater flows out through the wastewater outlet 13 and is discharged into the sewer through the wastewater pipe 4. Pure water flows through the pure water pipe 3 to the return pipe 8, then flows back into the inlet pipe 2 to mix with the raw water before re-entering the reverse osmosis filter 1 through the booster pump 22. The booster pump 22 pressurizes the water in the water purification system 100, increasing the drainage and return speed, thereby maximizing the discharge of water from the pre-filter 5 and reverse osmosis filter 1. Then, at every fourth preset time interval, the inlet valve 21 and the wastewater valve 41 are opened repeatedly, and the booster pump 22 is turned on. Under the action of the booster pump 22, the water in the pre-filter 5 is allowed to flow or the volume of water stored in the pre-filter 5 is reduced, thereby preventing the pre-filter 5 from freezing and cracking, which would affect the water purification system 100.

[0127] Of course, the embodiments of the present invention are not limited to this. In the embodiment of the water purification system 100 that does not include the booster pump 22, the water flow in the pre-filter cartridge 5 or the volume of water stored in the pre-filter cartridge 5 can also be controlled by relying on the pressure of the raw water itself.

[0128] In some embodiments of the present invention, a main water inlet switch is provided between the water inlet pipe 2 and the water source. Specifically, one end of the main water inlet switch is connected to the water source, and the other end is connected to the water inlet pipe 2. The main water inlet switch is used to control whether the water source flows into the water purification system 100.

[0129] Optionally, after the inlet valve 21 and the return valve 81 are opened and then closed after a third preset time, the anti-freezing and cracking method further includes:

[0130] Determine whether the main water inlet switch is closed; after the water inlet valve 21 and the return valve 81 are opened and closed after a third preset time, determine the subsequent steps of the anti-freeze and cracking mode based on the state of the main water inlet switch.

[0131] Specifically, a TDS detection device 7 can be installed on the inlet pipe 2, on the side of the inlet valve 21 away from the raw water inlet 11. The difference between the TDS values ​​measured by the TDS detection device 7 at different times can be used to determine whether the main water inlet switch is closed. The determination process of the TDS detection device 7 is similar to that in the above embodiment, and will not be described in detail here.

[0132] Of course, other judgment methods are also acceptable, and no specific restrictions are imposed here, as long as it can determine whether the main water inlet switch is in the open or closed state.

[0133] If not closed, the steps of opening the inlet valve 21 and closing the wastewater valve 41 after a fifth preset time are repeated every fourth preset time. When the main inlet switch is open, raw water continuously enters the water purification system 100 from the inlet pipe 2. Simply opening the inlet valve 21 and closing the return valve 81 after a third preset time in the previous steps only allows water to flow within the pre-filter cartridge 5; it does not reduce the volume of water in the pre-filter cartridge 5. Therefore, when the main inlet switch is open, the inlet valve 21 and wastewater valve 41 need to be opened and closed after a fifth preset time every fourth preset time to repeatedly create water flow within the pre-filter cartridge 5, slowing down the freezing process and preventing the pre-filter cartridge 5 from freezing and cracking.

[0134] If closed, it enters standby mode. Specifically, after the inlet valve 21 and return valve 81 are opened for a third preset time in the previous steps, they are closed. Water in the water purification system 100 is discharged into the sewer through the wastewater pipe 4. The return pipe 8 further reduces the volume of water stored in the pre-filter cartridge 5, providing sufficient space for the water in the pre-filter cartridge 5 to solidify, preventing the outer shell of the pre-filter cartridge 5 from cracking. Therefore, with the main inlet switch closed, no raw water enters the pre-filter cartridge 5 from the inlet pipe 2, and there is no need to reopen the inlet valve 21 and wastewater valve 41. At this time, the water purification system 100 remains in standby mode, thus preventing the pre-filter cartridge 5 from freezing and cracking.

[0135] Understandably, after activating the anti-freeze / crack mode, the inlet valve 21 and return valve 81 are first forcibly opened for a third preset time and then closed. Then, depending on whether the main water inlet switch is closed, the system decides whether to repeat the process of opening the inlet valve 21 and wastewater valve 41 every fourth preset time and then closing them for a fifth preset time, or to leave the system in standby mode. This allows the system to determine the subsequent steps based on whether the main water inlet switch is closed, avoiding the situation where, after the water in the pre-filter 5 has been drained through the inlet valve 21 and return valve 81 when the main water inlet switch is closed, the inlet valve 21 and wastewater valve 41 are reopened, resulting in wasted electricity and improving the user experience.

[0136] The following will describe, by way of example, a method for preventing freezing and cracking of a water purification system 100 according to an embodiment of the present invention.

[0137] Implementation Method 1

[0138] Get the water temperature inside the pre-filter 5;

[0139] Ensure the water temperature is less than or equal to the preset temperature value;

[0140] Open the inlet valve 21, the return valve 81, and the booster pump 22, and then close them after a third preset time.

[0141] Check if the main water inlet switch is closed;

[0142] If not closed, the steps of opening the inlet valve 21, wastewater valve 41 and booster pump 22 and then closing them after the fifth preset time will be repeated every fourth preset time.

[0143] If turned off, it will be in standby mode.

[0144] Implementation Method 2

[0145] Get the water temperature inside the pre-filter 5;

[0146] Ensure the water temperature is less than or equal to the preset temperature value;

[0147] Open the inlet valve 21 and the return valve 81 and then close them after the third preset time.

[0148] Check if the main water inlet switch is closed;

[0149] If not closed, the process of opening the inlet valve 21 and the wastewater valve 41 and then closing them will be repeated every fourth preset time interval.

[0150] If turned off, it will be in standby mode.

[0151] The following is for reference. Figures 1-3 A water purification system 100 according to an embodiment of the present invention is described.

[0152] The water purification system 100 according to an embodiment of the present invention operates in accordance with the above-described method for preventing freezing and cracking of the water purification system 100.

[0153] The water purification system 100 includes a reverse osmosis filter element 1, an inlet pipe 2, a pure water pipe 3, a wastewater pipe 4, a pre-filter element 5, and an inlet valve 21.

[0154] Specifically, the reverse osmosis filter element 1 has a raw water inlet 11, a pure water outlet 12, and a wastewater outlet 13. One end of the inlet pipe 2 is connected to the raw water inlet 11, and the other end is connected to a water source. The pure water pipe 3 is connected to the pure water outlet 12, and the wastewater pipe 4 is connected to the wastewater outlet 13. It can be understood that the raw water in the inlet pipe 2 enters the reverse osmosis filter element 1 for treatment through the raw water inlet 11. The generated pure water flows out through the pure water outlet 12 and the pure water pipe 3 for user use, while the wastewater is discharged through the wastewater outlet 13 and the wastewater pipe 4.

[0155] Wastewater valve 41 is installed on wastewater pipe 4. It is understood that when wastewater valve 41 is open, the pressure inside wastewater pipe 4 increases, increasing the wastewater discharge rate and volume of reverse osmosis filter element 1. By controlling wastewater valve 41, the entire water purification system 100 can be drained through wastewater pipe 4, thus cleaning the system. Furthermore, when implementing anti-freezing measures, controlling wastewater valve 41 allows for the drainage of water from pre-filter element 5 through wastewater pipe 4, providing sufficient space for the water to solidify and preventing the pre-filter element 5 from cracking. It should be noted that when wastewater valve 41 is closed, a small amount of wastewater still flows out of wastewater outlet 12, thus discharging into the sewer through wastewater pipe 4; when wastewater valve 41 is fully open, virtually no water flows out of pure water outlet 12.

[0156] The pre-filter 5 is connected in series with the inlet pipe 2. Located between the reverse osmosis filter 1 and the main inlet water, the pre-filter 5 pre-filters the tap water entering the water purification system 100, primarily removing rust, sediment, and adsorbing discoloration, odors, residual chlorine, and some organic matter, further ensuring the water purification effect of the water purification system 100. Optionally, the pre-filter 5 can be a PP cotton filter, a carbon rod filter, or a pre-filter FPC / PAC filter, etc.

[0157] An inlet valve 21 is installed on the inlet pipe 2 to control the opening and closing of the inlet pipe 2. The inlet valve 21 is located between the pre-filter cartridge 5 and the raw water inlet 11. When the water purification system 100 is preparing pure water, the inlet valve 21 is in the open state, and the raw water treated by the pre-filter cartridge 5 enters the reverse osmosis filter cartridge 1 for further treatment through the raw water inlet 11. When the water purification system 100 is in standby mode, the inlet valve 21 is in the closed state. Optionally, the inlet valve 21 can be a solenoid valve or a manually operated mechanical valve.

[0158] The temperature detection device 6 is installed on the water inlet pipe 2 and located on the side of the water inlet valve 21 away from the raw water inlet 11, or on the pre-filter cartridge 5, for detecting water temperature. Specifically, the temperature detection device 6 detects the water temperature inside the pre-filter cartridge 5, and when the detected temperature is lower than a preset temperature value, the aforementioned anti-freezing and cracking method of the water purification system 100 is activated.

[0159] According to the embodiment of the present invention, the water purification system 100 prevents freezing and cracking by adopting the above-described anti-freezing and cracking method. Based on the water temperature of the water in the pre-filter 5, the anti-freezing and cracking mode is activated when the water temperature is less than or equal to a preset temperature value, thereby preventing the water in the pre-filter 5 from freezing and cracking due to its volume expansion, thus ensuring the reliability and safety of the water purification system 100.

[0160] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0161] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A method for preventing freezing and cracking of a water purification system, characterized in that, The water purification system includes a reverse osmosis filter element, an inlet pipe, a pure water pipe, a wastewater pipe, a pre-filter element, and an inlet valve. The reverse osmosis filter element has a raw water inlet, a pure water outlet, and a wastewater outlet. One end of the inlet pipe is connected to the raw water inlet, and the other end is connected to a water source. The pure water pipe is connected to the pure water outlet, and the wastewater pipe is connected to the wastewater outlet. A wastewater valve is installed on the wastewater pipe. The pre-filter element is connected in series with the inlet pipe. The inlet valve is located on the inlet pipe to control the opening and closing of the inlet pipe. The inlet valve is located between the pre-filter element and the raw water inlet. The method for preventing frost cracking includes: Obtain the water temperature inside the pre-filter; The water temperature is determined to be less than or equal to a preset temperature value; Activating the anti-freeze / crack mode includes controlling the water flow within the pre-filter or reducing the volume of water stored in the pre-filter. The water purification system also includes a return water pipe, one end of which is connected to the pure water pipe, and the other end of which is connected to the inlet water pipe. The connection point between the return water pipe and the inlet water pipe is located on the side of the inlet valve closer to the raw water inlet. The return water pipe is equipped with a return water valve, and a main inlet switch is provided between the inlet water pipe and the water source. Controlling the water flow within the pre-filter or reducing the volume of water stored in the pre-filter includes: The inlet valve and the return valve are opened and then closed after a third preset time. Determine whether the main water inlet switch is closed; If not closed, the steps of opening the inlet valve and closing the wastewater valve after a fifth preset time are repeated every fourth preset time. If turned off, it will be in standby mode.

2. The method for preventing freezing and cracking of a water purification system according to claim 1, characterized in that, The preset temperature value is 0-10℃.

3. The method for preventing freezing and cracking of the water purification system according to claim 1, characterized in that, Controlling the water flow within the pre-filter or reducing the volume of water stored in the pre-filter includes: The inlet valve and the wastewater valve are opened and then closed after a first preset time. The steps of opening the water inlet valve and the wastewater valve are repeated every second preset time interval.

4. The method for preventing freezing and cracking of the water purification system according to claim 3, characterized in that, The first preset time is 1-60 seconds.

5. The method for preventing freezing and cracking of a water purification system according to claim 3, characterized in that, The second preset time is 10-120 minutes.

6. The method for preventing freezing and cracking of a water purification system according to claim 3, characterized in that, A booster pump is connected in series on the water inlet pipe. Controlling the water flow in the pre-filter or reducing the volume of water stored in the pre-filter also includes turning on the booster pump while opening the water inlet valve and the wastewater valve.

7. The method for preventing freezing and cracking of a water purification system according to any one of claims 3-6, characterized in that, The water inlet pipe is connected to the water source by a main water inlet switch. After the water inlet valve and the wastewater valve are opened and then closed after a first preset time, the anti-freezing and cracking method further includes: Determine whether the main water inlet switch is closed; If not closed, the steps of opening the inlet valve and the wastewater valve will be repeated every second preset time interval; If turned off, it will be in standby mode.

8. The method for preventing freezing and cracking of a water purification system according to claim 1, characterized in that, The third preset time is 1-300s.

9. The method for preventing freezing and cracking of a water purification system according to claim 1, characterized in that, The fourth preset time is 10-120 minutes.

10. The method for preventing freezing and cracking of a water purification system according to claim 1, characterized in that, A booster pump is connected in series on the water inlet pipe. Controlling the water flow in the pre-filter or reducing the volume of water stored in the pre-filter also includes: turning on the booster pump while opening the water inlet valve and the water return valve, and turning on the booster pump while opening the water inlet valve and the wastewater valve.

11. A water purification system, characterized in that, The water purification system utilizes the anti-freezing cracking method according to any one of claims 1-10, and includes: A reverse osmosis filter element, wherein the reverse osmosis filter element has a raw water inlet, a pure water outlet and a wastewater outlet; The system includes an inlet pipe, a pure water pipe, and a wastewater pipe. One end of the inlet pipe is connected to the raw water inlet, and the other end is connected to a water source. The pure water pipe is connected to the pure water outlet, and the wastewater pipe is connected to the wastewater outlet. A wastewater valve is provided on the wastewater pipe. A pre-filter element, which is connected in series to the water inlet pipe; An inlet valve is provided on the inlet pipe to control the opening and closing of the inlet pipe. The inlet valve is located between the pre-filter and the raw water inlet. A temperature detection device is provided on the water inlet pipe and located on the side of the water inlet valve away from the raw water inlet, or on the pre-filter element, for detecting water temperature.

Images