Pre-filter and water purification system

Abstract

The utility model provides a pre-filter and a water purification system, the pre-filter comprises a machine head, an accommodating cavity is formed in the machine head, and the machine head is suitable for receiving tap water from a tap water pipeline and receiving waste water and tap water from an external water purifier; the filtering assembly is connected with the machine head, and the filtering assembly is suitable for mixing and filtering wastewater and tap water and discharging the mixed and filtered water from the machine head; the water quality detector is mounted in the accommodating cavity, and the water quality detector is suitable for acquiring the total dissolved solid matter value of the filtered water in real time; and the drainage assembly is arranged on the machine head, and the drainage assembly is suitable for draining at least part of the wastewater under the condition that the total dissolved solid substance value exceeds a preset value, so that the total dissolved solid substance value of the filtered water is kept within the preset value.

Description

Technical Field

[0001] At least one embodiment of this utility model relates to the field of pre-filter technology, and more particularly to a pre-filter and water purification system. Background Technology

[0002] Reverse osmosis water purifiers are highly efficient and safe water purification devices widely used in homes, industries, and other fields. However, during use, reverse osmosis water purifiers generate a large amount of wastewater, which not only wastes precious water resources but also increases the cost of wastewater treatment.

[0003] A pre-filter is the first coarse filtration device for the water supply throughout the house. It can filter out large particles such as sediment, rust, insect eggs, and red worms from tap water. Pre-filters are generally installed at the beginning of the pipe.

[0004] The wastewater discharge of a reverse osmosis water purifier depends primarily on factors such as the flux of its filter membrane, the pore size of the filter membrane, and the wastewater recycling method. In some related technologies, wastewater from a reverse osmosis water purifier is filtered through a pre-filter and then returned to the reverse osmosis water purifier, achieving wastewater recycling. However, in this technical solution, if the wastewater repeatedly circulates in the circulation pipe, it may cause the water quality of the circulating water entering the reverse osmosis water purifier to exceed standards, putting significant working pressure on the filter element of the reverse osmosis water purifier. Utility Model Content

[0005] In view of this, the present invention provides a pre-filter that can effectively improve the efficiency of wastewater recycling while ensuring that the quality of circulating water meets the working requirements of reverse osmosis water purifiers.

[0006] According to one aspect of the present invention, a pre-filter is provided, including a head having an internally formed receiving cavity adapted to receive tap water from a tap water pipe and wastewater from an external water purifier and the tap water; a filter assembly connected to the head, the filter assembly being adapted to mix and filter the wastewater and the tap water, and to discharge the mixed and filtered water from the head; a water quality detector installed in the receiving cavity, the water quality detector being adapted to acquire the total dissolved solids (TDS) value of the filtered water in real time; and a drainage assembly disposed in the head, the drainage assembly being adapted to discharge at least a portion of the wastewater when the TDS value exceeds a preset value, so that the TDS value of the filtered water remains within the preset value.

[0007] According to an embodiment of the present invention, the machine head is provided with: a first water inlet channel, which is connected to the filter assembly to introduce tap water into the filter assembly; a second water inlet channel, which is connected to the filter assembly to introduce wastewater into the filter assembly; and a one-way valve, which is placed in the receiving cavity and disposed in the second water inlet channel to prevent tap water from flowing back from the second water inlet channel.

[0008] According to an embodiment of the present invention, the drainage component includes: a drainage channel, one end of which is connected to the second water inlet channel and the other end of which is connected to an external sewer; and an electric valve disposed on the drainage channel, wherein the electric valve opens in response to the total dissolved solids value exceeding the preset value, thereby discharging at least a portion of the wastewater in the second water inlet channel through the drainage channel.

[0009] According to an embodiment of the present invention, the filter assembly includes: a housing with an internal cavity; a filter element placed inside the cavity, wherein an inlet channel is formed between the outer wall of the filter element and the inner wall of the housing; wherein the wastewater and the tap water from the machine head are filtered by the filter element through the inlet channel and then flow out through the outlet channel inside the filter element to the outlet channel on the machine head.

[0010] According to an embodiment of the present invention, the water outlet channel includes: a main water outlet channel connected to the water outlet flow channel; a first water outlet channel adapted to be connected to the main water outlet channel and to an external faucet to discharge the filtered water through the faucet; and a second water outlet channel adapted to be connected to the main water outlet channel and to the water inlet of the water purifier, so that at least a portion of the filtered water is used as the water inlet of the water purifier.

[0011] According to an embodiment of the present invention, the water quality detector is installed on the main water outlet channel, the first water outlet channel, or the second water outlet channel.

[0012] According to an embodiment of this utility model, the filter element is polypropylene fiber cotton, activated carbon, or an ultrafiltration membrane.

[0013] According to an embodiment of the present invention, the head includes: a base connected to the outer shell; a housing detachably connected to the base and defining the receiving cavity with the base; wherein a first water inlet channel and a second water inlet channel pass through the base to discharge the tap water and the wastewater into the filter assembly, and the filtered water passes through the base and is discharged from the drain channel.

[0014] According to an embodiment of the present invention, the pre-filter further includes a display, disposed on the head, for displaying the total dissolved solids value of the filtered water in real time.

[0015] As another aspect of the present invention, a water purification system is provided, comprising: a water purifier including an inlet and a wastewater outlet; and any of the above-mentioned pre-filters, wherein a second inlet channel of the pre-filter is connected to the wastewater outlet, and a second outlet channel of the pre-filter is connected to the inlet.

[0016] According to the pre-filter of this utility model embodiment, wastewater is mixed with tap water for filtration. A water quality detector is set to monitor the TDS value of the filtered water in real time. When the TDS exceeds the preset value, the drainage component automatically discharges part of the wastewater, keeping the TDS value of the filtered water within the preset value. This not only improves the recycling rate of water resources, but also ensures the quality of filtered water, reduces the direct discharge of wastewater, and extends the service life of the filter element of the external reverse osmosis water purifier, thereby reducing the replacement frequency and maintenance cost of the filter element of the reverse osmosis water purifier. Attached Figure Description

[0017] The above and other objects, features and advantages of the present invention will become clearer from the following description of embodiments of the present invention with reference to the accompanying drawings, in which:

[0018] Figure 1 A schematic diagram of a pre-filter according to an embodiment of the present invention is shown.

[0019] Figure 2 A perspective view of a pre-filter according to an embodiment of the present invention is shown schematically;

[0020] Figure 3 Schematic illustration Figure 2 The cross-sectional view of the pre-filter AA shown;

[0021] Figure 4 The diagram schematically shows a first-view perspective view of the removal housing of a pre-filter according to an embodiment of the present invention;

[0022] Figure 5 Schematic illustration Figure 4 A second-view perspective perspective of the pre-filter shown; and

[0023] Figure 6 A perspective view of a substrate according to an embodiment of the present invention is shown schematically.

[0024] The annotations in the attached figures are explained as follows:

[0025] 1. Machine head;

[0026] 11. First water inlet channel;

[0027] 111. First water outlet;

[0028] 12. Second water inlet channel;

[0029] 121. Second water inlet;

[0030] 13. Check valve;

[0031] 14. Matrix;

[0032] 141. Connecting part;

[0033] 15. Shell;

[0034] 16. Water outlet channel;

[0035] 161. First water outlet channel;

[0036] 162. Second water outlet channel;

[0037] 163. First water inlet end;

[0038] 2. Filter components;

[0039] 21. Outer shell;

[0040] 22. Filter element;

[0041] 23. Water inlet channel;

[0042] 24. Water outlet channel;

[0043] 3. Water quality detector;

[0044] 4. Drainage components;

[0045] 41. Drainage channels;

[0046] 42. Electric valve. Detailed Implementation

[0047] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0048] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of the invention. The terms “comprising,” “including,” etc., as used herein indicate the presence of the stated features, steps, operations, and / or components, but do not exclude the presence or addition of one or more other features, steps, operations, or components.

[0049] All terms used herein, including technical and scientific terms, have the meanings commonly understood by those skilled in the art, unless otherwise defined. It should be noted that the terms used herein are to be interpreted in a manner consistent with the context of this specification, and not in an idealized or overly rigid way.

[0050] When using expressions such as "at least one of A, B, and C," the meaning should generally be interpreted according to the understanding of someone skilled in the art. For example, "a system having at least one of A, B, and C" should include, but is not limited to, systems having A alone, having B alone, having C alone, having A and B, having A and C, having B and C, and / or having A, B, and C. Similarly, when using expressions such as "at least one of A, B, or C," the meaning should generally be interpreted according to the understanding of someone skilled in the art. For example, "a system having at least one of A, B, or C" should include, but is not limited to, systems having A alone, having B alone, having C alone, having A and B, having A and C, having B and C, and / or having A, B, and C.

[0051] It should also be noted that the directional terms mentioned in the embodiments, such as "up," "down," "front," "back," "left," and "right," are only for reference to the directions in the accompanying drawings and are not intended to limit the scope of protection of this utility model. Throughout the drawings, the same elements are represented by the same or similar reference numerals. Conventional structures or constructions will be omitted where they may cause confusion in understanding this utility model.

[0052] Figure 1 A schematic diagram of a pre-filter according to an embodiment of the present invention is shown. Figure 2 A perspective view of a pre-filter according to an embodiment of the present invention is shown schematically. Figure 1 The arrows in the diagram indicate the direction of water flow.

[0053] As one aspect of this utility model embodiment, a pre-filter is provided, such as... Figure 1 and Figure 2 As shown, the pre-filter includes a head unit 1, a filter assembly 2, a water quality detector 3, and a drain assembly 4. The head unit 1 has an internal receiving cavity, which is suitable for receiving tap water from a tap water pipe, as well as wastewater and tap water from an external water purifier. The filter assembly 2 is connected to the head unit and is suitable for mixing and filtering the wastewater and tap water, and discharging the mixed and filtered water from the head unit 1. The water quality detector 3 is installed in the receiving cavity and is suitable for real-time acquisition of the total dissolved solids (TDS) value of the filtered water. The drain assembly 4 is located on the head unit 1 and is suitable for discharging at least a portion of the wastewater when the TDS value exceeds a preset value, thus keeping the TDS value of the filtered water within the preset value.

[0054] According to the pre-filter of this utility model embodiment, wastewater is mixed with tap water for filtration. A water quality detector is set to monitor the TDS value of the filtered water in real time. When the TDS exceeds the preset value, the drainage component automatically discharges part of the wastewater, keeping the TDS value of the filtered water within the preset value. This not only improves the recycling rate of water resources, but also ensures the quality of filtered water, reduces the direct discharge of wastewater, and extends the service life of the filter element of the external reverse osmosis water purifier, thereby reducing the replacement frequency and maintenance cost of the filter element of the reverse osmosis water purifier.

[0055] In this field, depending on the region and the quality of the local tap water pipeline, the TDS value of tap water is generally 200~250mg / L. Pure water purified by a water purifier has a TDS value range of 0~50mg / L and is considered direct drinking water, which is also commonly referred to as "pure water" in this field.

[0056] According to embodiments of this utility model, the preset value can be set to 650mg / L, 700mg / L, 750mg / L or 800mg / L, depending on the region and the quality of the local tap water pipeline.

[0057] In this embodiment, the water quality detector can be a TDS sensor. The TDS sensor monitors the TDS value of the filtered water in real time. When the detected TDS value exceeds a preset value, the drainage component automatically discharges part of the wastewater, thereby inhibiting the further increase of the TDS value of the filtered water. When the detected TDS value is less than or equal to a low threshold (the low threshold can be set to 300 mg / L, 320 mg / L, 360 mg / L, 380 mg / L, or 390 mg / L), the drainage component stops discharging wastewater.

[0058] According to an embodiment of this utility model, the TDS value of tap water is less than the low threshold and less than the preset value.

[0059] According to embodiments of the present invention, such as Figure 1 and Figure 2 As shown, the head unit 1 includes a base 14 and a housing 15. The base 14 is detachably connected to the housing 21 of the filter assembly 2. The housing 15 is detachably connected to the base 14 and defines a receiving cavity with the base 14.

[0060] According to an embodiment of the present invention, the substrate 14 extends toward the filter assembly 2 to form a connecting portion 141.

[0061] In one illustrative embodiment, the head unit 1 and the filter assembly 2 can be threaded together. The connecting portion 141 forms an internal thread, and the housing 21 of the filter assembly 2 forms an external thread that engages with the internal thread of the connecting portion 141.

[0062] In one illustrative embodiment, the head unit 1 and the filter assembly 2 can be connected by a snap-fit ​​connection.

[0063] In this embodiment, the housing 15 is detachably connected to the base 14 (e.g., by threaded connection or snap-fit), allowing for quick opening of the housing when the water quality detector 3 and drainage assembly 4 need to be inspected or replaced, facilitating maintenance and upkeep. By detachably connecting the base 14 to the filter assembly 2, the base 14 can be easily separated from the filter assembly 2 when the filter element 22 needs to be cleaned or replaced, facilitating maintenance and upkeep.

[0064] According to an embodiment of the present invention, a sealing gasket may also be provided between the shell 15 and the base 14 to maintain the seal of the receiving cavity.

[0065] Figure 3 Schematic illustration Figure 2 The diagram shows a cross-sectional view of the pre-filter AA.

[0066] According to embodiments of the present invention, such as Figure 1 and Figure 3 As shown, the filter assembly 2 includes a housing 21 and a filter element 22. A cavity is formed inside the housing 21, and the filter element 22 is placed inside the cavity. A water inlet channel 23 is formed between the outer wall of the filter element 22 and the inner wall of the housing 21. Wastewater and tap water from the machine head 1 flow through the water inlet channel 23, are filtered by the filter element 22, and then flow out through the water outlet channel 24 inside the filter element 22 to the water outlet channel 16 on the machine head.

[0067] In one illustrative embodiment, the filter element 22 may be coaxially arranged with the housing 21. The water outlet channel 24 may be located at the center of the filter element 22.

[0068] In one illustrative embodiment, the filter element 22 can be pressed between the substrate 14 and the outer casing 21. Specifically, as shown... Figure 2 From the perspective shown, the filter element 22 can be pressurized between the lower wall of the substrate 14 and the bottom wall of the outer casing 21.

[0069] According to embodiments of this utility model, the filter element may include, but is not limited to, polypropylene fiber cotton (PP cotton), activated carbon, or ultrafiltration membrane.

[0070] Figure 4 This schematically illustrates a first-view perspective view of the removal housing of a pre-filter according to an embodiment of the present invention. Figure 5 Schematic illustration Figure 4 The image shown is a second-view perspective stereoscopic view of the pre-filter. Figure 6 A perspective view of a substrate according to an embodiment of the present invention is shown schematically.

[0071] According to embodiments of the present invention, such as Figure 4 , Figure 5 and Figure 6 As shown, the machine head is equipped with a first water inlet channel 11, a second water inlet channel 12, and a one-way valve 13. The first water inlet channel 11 is connected to the filter assembly 2 to introduce tap water into the filter assembly 2. The second water inlet channel 12 is connected to the filter assembly 2 to introduce wastewater into the filter assembly 2. The one-way valve 13 is placed in the receiving cavity and is located in the second water inlet channel 12 to prevent tap water from flowing back from the second water inlet channel 12.

[0072] According to an embodiment of the present invention, the first water inlet channel 11 and the second water inlet channel 12 pass through the base 14 to discharge tap water and wastewater into the filter assembly 2, and the filtered water passes through the base 14 (from the water outlet channel 16) from the water outlet channel 24 of the filter assembly 2.

[0073] In one illustrative embodiment, the first water inlet channel 11 has a first water outlet 111 communicating with the water inlet channel 23 of the filter assembly 2, and a first water inlet located on the side wall of the body 14. The first water inlet channel may be formed on the base 14, or the first water inlet and the first water outlet 111 may be formed on the base, and the first water inlet and the second water inlet may be connected by a pipeline.

[0074] Understandably, the first water inlet and the second water inlet channel 12 may have threaded structures to facilitate communication with external pipelines. Alternatively, both the first water inlet and the second water inlet channel 12 may protrude from the base and have internal or external threads to facilitate communication with external pipelines. Alternatively, the first water inlet and the second water inlet channel 12 may be connected to quick-connect fittings.

[0075] In one illustrative embodiment, the second inlet end 121 and the second outlet end of the second water inlet channel 12 can both be formed on the substrate 14.

[0076] like Figure 6 As shown, the second outlet of the second water inlet channel 12 can converge with the first outlet 111 of the first water inlet pipe 11. Alternatively, it can be connected to the water inlet channel 23 of the filter assembly 2 through a separate second outlet.

[0077] In some other illustrative embodiments, the water outlet channel includes a main water outlet channel, a first water outlet channel, and a second water outlet channel. The main water outlet channel is connected to the water outlet flow channel, the first water outlet channel is adapted to be connected to the main water outlet channel and to an external faucet to discharge filtered water through the faucet; the second water outlet channel is adapted to be connected to the main water outlet channel and to the water inlet of the water purifier, so that at least a portion of the filtered water is used as the water inlet of the water purifier.

[0078] In such an embodiment, without wastewater flowing into the pre-filter, the pre-filter can filter the tap water and discharge it as filtered water.

[0079] According to an embodiment of the present invention, the drainage assembly 4 includes a drainage channel 41 and an electric valve 42. One end of the drainage channel 41 is connected to the second water inlet channel 12, and the other end of the drainage channel 41 is connected to an external sewer. The electric valve 42 is disposed on the drainage channel 41, and the electric valve 42 opens in response to the total dissolved solids exceeding a preset value, discharging at least a portion of the wastewater in the second water inlet channel 162 through the drainage channel 41.

[0080] In one illustrative embodiment, the electric valve 42 can be a solenoid valve.

[0081] According to an embodiment of the present invention, the drainage channel 41 is connected to the second water inlet channel 12 upstream of the one-way valve 13.

[0082] Understandably, the outlet end of the drainage channel 41 may have a threaded structure to facilitate connection with external pipes. Alternatively, the outlet end of the drainage channel 41 may protrude from the base and have an internal or external threaded structure to facilitate connection with external pipes. Alternatively, the outlet end of the drainage channel 41 may be connected to a quick-connect fitting.

[0083] In this embodiment, the TDS sensor monitors the TDS value of the filtered water in real time. When the detected TDS value exceeds a preset value, the solenoid valve opens, and the wastewater flowing from the external water purifier's wastewater outlet is discharged into the sewer pipe through the drain channel 41, thereby suppressing the further increase in the TDS value of the filtered water. When the detected TDS value is below a low threshold, the solenoid valve closes, and the wastewater continues to flow into the filter assembly, mixing with the tap water.

[0084] According to embodiments of the present invention, such as Figure 6 As shown, the first inlet end of the water outlet channel 16 is connected to the water outlet channel 24 of the filter assembly 2. Filtered water from the filter assembly 2 flows into the water outlet channel 16 through the first inlet end 163.

[0085] In one illustrative embodiment, the outlet ends of the first and second water outlet pipes can be formed on the base. The outlet ends of the first and second water outlet pipes can have internal threads to facilitate communication with external pipelines. Alternatively, the outlet ends of the first and second water outlet pipes can protrude from the base 14, and the outlet ends of the first and second water outlet pipes can have internal or external threads to facilitate communication with external pipelines. Alternatively, the outlet end of the water outlet pipe 16 can be connected to a quick-connect fitting.

[0086] According to embodiments of the present invention, such as Figure 1 , Figure 4 , Figure 5 and Figure 6 As shown, the water outlet channel 16 includes a first water outlet channel 161 and a second water outlet channel 162. The first water outlet channel 161 is adapted to connect with an external faucet to discharge filtered water through the faucet. The second water outlet channel 162 is adapted to connect with the water inlet of the water purifier, so that at least a portion of the filtered water is used as the water inlet of the water purifier.

[0087] like Figure 6 As shown, the water outlet and water inlet of the first water outlet channel 161, and the water outlet and water inlet of the second water outlet channel 162 are all formed on the substrate.

[0088] In one illustrative embodiment, the first water outlet channel 161 and the second water outlet channel 162 can be formed in the substrate. Alternatively, the water outlet end and the water inlet end of the first water outlet channel 161 can be connected by a first pipe, and the water outlet end and the water inlet end of the second water outlet channel 162 can be connected by a second pipe.

[0089] In one illustrative embodiment, the first water outlet channel 161 and the second water outlet channel 162 may have a common first water inlet 163, or the first water outlet channel 161 and the second water outlet channel 162 may each have a water inlet that communicates with the water outlet channel 24 of the filter assembly 2.

[0090] According to an embodiment of the present invention, the water quality detector 3 is installed on at least one of the main water outlet channel, the first water outlet channel 161, and the second water outlet channel 162.

[0091] According to an embodiment of the present invention, there may be multiple water quality detectors 3, which are respectively installed on the first water outlet channel 161, the second water outlet channel 162 and the main water outlet channel.

[0092] According to an embodiment of the present invention, the pre-filter also includes a display (not shown in the figure), which is disposed on the head 1 to display the total dissolved solids value of the filtered water in real time.

[0093] In one illustrative embodiment, the display may be encapsulated on the base 14, exposing the display surface.

[0094] In one illustrative embodiment, the pre-filter provided by this invention can be installed under the sink.

[0095] Reverse osmosis water purifiers in related technologies waste at least 35% of tap water. The pre-filter provided by this utility model automatically collects and uses the wastewater from the reverse osmosis water purifier for mixed filtration and recycling, achieving the function of zero wastewater in the water purifier, without wasting tap water, and at the same time filtering the tap water and improving the water quality.

[0096] As another aspect of this utility model, a water purification system is provided, including a water purifier and any of the above-described pre-filters. The water purifier includes an inlet and a wastewater outlet. The second inlet channel of any of the above-described pre-filters is connected to the wastewater outlet, and the second outlet channel of the pre-filter is also connected to the wastewater outlet.

[0097] According to an embodiment of this utility model, the water purifier can be a reverse osmosis water purifier.

[0098] Compared to commercial water purifiers, household water purifiers have unique characteristics. Taking a family of five as an example, each person drinks approximately 2 liters of water daily. Adding in water used for cooking and brewing tea, the total daily water consumption is about 15-20 liters (corresponding to 15-20 liters of wastewater). Water usage is mostly concentrated in three time slots: 7-9 am, 11 am-1 pm, and 5-9 pm. Water purifiers include those with and without a pure water pressure tank. The former produces water in a concentrated period with a larger volume per cycle, for example, producing 3-5 times a day, each time producing 3-5 liters. The latter produces water more frequently but in smaller volumes per cycle, for example, 5-10 times a day, each time producing 0.2-3 liters.

[0099] Based on the aforementioned characteristics of water purifiers, this utility model installs a pre-filter between the wastewater inlet and the inlet of the water purifier. The pre-filter is also connected to the tap water pipe. The wastewater generated by the water purifier is mixed with tap water in the inlet channel of the pre-filter and filtered by the filter element of the pre-filter. The first outlet channel of the pre-filter can be connected to other household water facilities, such as washing machines, toilets, washbasins, water heaters, and showers. Based on this, the filtered water produced by the pre-filter can be replaced periodically, so that the impurity content of the filtered water entering the inlet of the water purifier, i.e., the TDS (Total Dissolved Solids) value, remains basically unchanged, thus achieving "zero wastewater" water production by the water purifier.

[0100] The embodiments of the present invention have been described above. However, these embodiments are for illustrative purposes only and are not intended to limit the scope of the present invention. Although various embodiments have been described above, this does not mean that the measures in the various embodiments cannot be used advantageously in combination. The scope of the present invention is defined by the appended claims and their equivalents. Various substitutions and modifications can be made by those skilled in the art without departing from the scope of the present invention, and all such substitutions and modifications should fall within the scope of the present invention.

Claims

1. A pre-filter, characterized in that, include: The head has an internal cavity for receiving tap water from a tap water pipe, as well as wastewater from an external water purifier and the tap water. A filter assembly is connected to the machine head. The filter assembly is adapted to mix and filter the wastewater and the tap water, and to discharge the mixed and filtered water from the machine head. A water quality detector is installed inside the receiving cavity, and the water quality detector is suitable for obtaining the total dissolved solids value of the filtered water in real time; as well as A drainage component is provided at the machine head. The drainage component is adapted to discharge at least a portion of the wastewater when the total dissolved solids value exceeds a preset value, so that the total dissolved solids value of the filtered water remains within the preset value.

2. The pre-filter according to claim 1, characterized in that, The machine head is equipped with: The first water inlet channel is connected to the filter assembly to introduce the tap water into the filter assembly; The second water inlet channel is connected to the filter assembly to introduce the wastewater into the filter assembly; as well as A one-way valve is placed inside the receiving cavity and located in the second water inlet channel to prevent the tap water from flowing back from the second water inlet channel.

3. The pre-filter according to claim 2, characterized in that, The drainage assembly includes: The drainage channel is connected at one end to the second water inlet channel and at the other end to the external sewer. An electric valve is installed on the drainage channel. The electric valve opens in response to the total dissolved solids value exceeding the preset value, and discharges at least a portion of the wastewater in the second inlet channel through the drainage channel.

4. The pre-filter according to claim 3, characterized in that, The filtering component includes: The outer shell has an internal cavity. A filter element is placed inside the cavity, and a water inlet channel is formed between the outer wall of the filter element and the inner wall of the outer shell; The wastewater and tap water from the machine head are filtered by the filter element through the inlet channel and then flow out from the outlet channel inside the filter element to the outlet channel on the machine head.

5. The pre-filter according to claim 4, characterized in that, The water outlet channel includes: The main water outlet channel is connected to the water outlet flow channel; A first water outlet channel is adapted to connect with the main water outlet channel and to an external faucet to discharge the filtered water through the faucet; and The second water outlet channel is adapted to be connected to the main water outlet channel and to the water inlet of the water purifier, so that at least a portion of the filtered water is used as the water inlet of the water purifier.

6. The pre-filter according to claim 5, characterized in that, The water quality detector is installed on the main water outlet channel, the first water outlet channel, or the second water outlet channel.

7. The pre-filter according to claim 5, characterized in that, The filter element is made of polypropylene fiber cotton, activated carbon, or an ultrafiltration membrane.

8. The pre-filter according to any one of claims 4-7, characterized in that, The machine head includes: The base material is connected to the outer shell; The housing is detachably connected to the base and defines the receiving cavity with the base; The first water inlet channel and the second water inlet channel pass through the substrate to discharge the tap water and the wastewater into the filter assembly, and the filtered water passes through the substrate and is discharged from the drainage channel.

9. The pre-filter according to any one of claims 1-7, characterized in that, Also includes: A display, located on the head of the machine, is provided to display the total dissolved solids (TDS) value of the filtered water in real time.

10. A water purification system, characterized in that, include: A water purifier includes an inlet and a wastewater outlet; as well as According to any one of claims 1 to 9, the second inlet channel of the pre-filter is connected to the wastewater outlet, and the second outlet channel of the pre-filter is connected to the inlet.

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