Pre-filter and water purification system

Abstract

The invention provides a pre-filter which 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 the present disclosure relates to the technical field of pre-filters, and in particular, to a pre-filter and a water purification system. Background Art

[0002] Reverse osmosis water purifier is a highly efficient and safe water purification equipment widely used in household, industrial and other fields. However, during use, reverse osmosis water purifier will produce a large amount of wastewater, which not only wastes precious water resources, but also increases the cost of wastewater treatment.

[0003] The pre-filter is the first coarse filtration device for the water used in the whole house. It can filter out large particles such as sand, rust, insect eggs, and red worms in tap water. The pre-filter is usually installed at the front end of the pipe.

[0004] The amount of wastewater discharged from a reverse osmosis water purifier mainly depends on factors such as the flux of its filter membrane, the pore size of the filter membrane, and the way the wastewater is recycled. In the related art, the wastewater of some reverse osmosis water purifiers is filtered through a pre-filter and then returned to the reverse osmosis water purifier to achieve wastewater recycling. However, in such a technical solution, if the wastewater circulates repeatedly in the circulation pipeline, it may also cause the water quality of the circulating water entering the reverse osmosis water purifier to exceed the standard, causing greater working pressure on the filter element of the reverse osmosis water purifier. Summary of the invention

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

[0006] According to one aspect of an embodiment of the present disclosure, there is provided a pre-filter, comprising a machine head, an internal accommodating chamber formed therein, suitable for receiving tap water from a tap water pipe, and receiving waste water and the tap water from an external water purifier; a filter assembly connected to the machine head, the filter assembly being suitable for mixing and filtering the waste water with the tap water, and discharging the filtered water after mixing and filtration from the machine head; a water quality detector installed in the accommodating chamber, the water quality detector being suitable for obtaining the total dissolved solids value of the filtered water in real time; and a drainage assembly arranged on the machine head, the drainage assembly being suitable for at least partially discharging the waste water when the total dissolved solids value exceeds a preset value, so as to keep the total dissolved solids value of the filtered water within the preset value.

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

[0008] According to an embodiment of the present disclosure, 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; an electric valve, which is arranged on the drainage channel, and the electric valve is opened in response to the total dissolved solids value exceeding the preset value, so as to discharge 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 disclosure, the filter assembly includes: an outer shell, which forms a cavity inside; a filter element, which is placed in 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; wherein the waste water and the tap water from the machine head are filtered by the filter element from the water inlet channel and then flow out from the water outlet channel in the filter element to the water outlet channel on the machine head.

[0010] According to an embodiment of the present disclosure, the water outlet channel includes: a main water outlet channel, which is connected to the water outlet flow channel; a first water outlet channel, which is suitable for being connected to the main water outlet channel and to an external faucet so as to discharge the filtered water through the faucet; and a second water outlet channel, which is suitable for being 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 can be used as the inlet water of the water purifier.

[0011] According to an embodiment of the present disclosure, 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 the present disclosure, the filter element is polypropylene fiber cotton, activated carbon or ultrafiltration membrane.

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

[0014] According to an embodiment of the present disclosure, the above-mentioned pre-filter further includes: a display, which is arranged on the head of the machine to display the total dissolved solid matter value of the filtered water in real time.

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

[0016] According to the pre-filter of the embodiment of the present disclosure, waste water is mixed with tap water and then filtered, and 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 waste water to keep 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 waste water, 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. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The above and other objects, features and advantages of the present disclosure will become more apparent through the following description of the embodiments of the present disclosure with reference to the accompanying drawings, in which:

[0018] Figure 1 The schematic diagram of the pre-filter according to the embodiment of the present disclosure is shown;

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

[0020] Figure 3 Schematically shows Figure 2 A cross-sectional view of AA of the pre-filter shown;

[0021] Figure 4 Schematically shows a perspective view of a pre-filter according to an embodiment of the present disclosure with a housing removed from a first viewing angle;

[0022] Figure 5 Schematically shows Figure 4 A perspective view of the second viewing angle of the pre-filter shown; and

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

[0024] The following are the descriptions of the reference numerals:

[0025] 1. Machine head;

[0026] 11. The first water inlet channel;

[0027] 111, first water outlet;

[0028] 12. Second water inlet channel;

[0029] 121, second water inlet end;

[0030] 13. One-way 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;

[0038] 2. Filter components;

[0039] 21. 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 channel;

[0046] 42. Electric valve. DETAILED DESCRIPTION

[0047] In order to make the objectives, technical solutions and advantages of the present disclosure more clearly understood, the present disclosure is further described in detail below in combination with specific embodiments and with reference to the accompanying drawings.

[0048] The terms used herein are only for describing specific embodiments and are not intended to limit the present disclosure. The terms "comprise", "include", etc. used herein indicate the existence of the features, steps, operations and / or components, but do not exclude the existence 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 should be interpreted as having a meaning consistent with the context of this specification, and should not be interpreted in an idealized or overly rigid manner.

[0050] When using expressions such as "at least one of A, B, and C, etc.", it should generally be interpreted as the meaning of the expression generally understood by those skilled in the art. For example, "a system having at least one of A, B, and C" should include but not be limited to a system having A alone, B alone, C alone, A and B, A and C, B and C, and / or A, B, C, etc. When using expressions such as "at least one of A, B, or C, etc.", it should generally be interpreted as the meaning of the expression generally understood by those skilled in the art. For example, "a system having at least one of A, B, or C" should include but not be limited to a system having A alone, B alone, C alone, A and B, A and C, B and C, and / or A, B, C, etc.

[0051] It should also be noted that the directional terms mentioned in the embodiments, such as "upper", "lower", "front", "back", "left", "right", etc., are only reference directions of the drawings and are not intended to limit the scope of protection of the present disclosure. Throughout the drawings, the same elements are represented by the same or similar reference numerals. Conventional structures or configurations will be omitted when they may cause confusion in the understanding of the present disclosure.

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

[0053] As one aspect of the embodiments of the present disclosure, a pre-filter is provided, such as Figure 1 and Figure 2 As shown, the pre-filter includes a head 1, a filter assembly 2, a water quality detector 3 and a drainage assembly 4. A receiving chamber is formed inside the head 1, and the head 1 is suitable for receiving tap water from a tap water pipe, as well as receiving waste water and tap water from an external water purifier. The filter assembly 2 is connected to the head, and the filter assembly 2 is suitable for mixing and filtering waste water with tap water, and discharging the filtered water after mixing and filtering from the head 1. The water quality detector 3 is installed in the receiving chamber, and the water quality detector 3 is suitable for obtaining the total dissolved solids value (TDS) of the filtered water in real time. The drainage assembly 4 is arranged on the head 1, and the drainage assembly 4 is suitable for at least partially discharging the waste water when the total dissolved solids value (TDS) exceeds a preset value, so that the total dissolved solids value of the filtered water is kept within the preset value.

[0054] According to the pre-filter of the embodiment of the present disclosure, waste water is mixed with tap water and then filtered, and 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 waste water to keep 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 waste water, 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, the TDS value of tap water is generally 200~250mg / L, depending on the region and the quality of the local tap water pipeline. Pure water purified by a water purifier has a TDS value range of 0~50mg / L, which is direct drinking water, also commonly referred to as "pure water" in this field.

[0056] According to an embodiment of the present disclosure, the preset value can be set to 650 mg / L, 700 mg / L, 750 mg / L or 800 mg / L according to the region and the quality of the local tap water pipeline.

[0057] In this embodiment, the water quality detector can be a TDS sensor, which monitors the TDS value of the filtered water in real time. When the monitored TDS value exceeds a preset value, the drainage component automatically discharges part of the wastewater, thereby suppressing the continued increase of the TDS value of the filtered water. When the monitored 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 the present disclosure, the TDS value of tap water is less than the low threshold value and less than the preset value.

[0059] According to the embodiments of the present disclosure, Figure 1 and Figure 2 As shown, the head 1 includes a base 14 and a shell 15. The base 14 is detachably connected to the housing 21 of the filter assembly 2. The shell 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 disclosure, the base 14 extends toward the filter assembly 2 to form a connecting portion 141 .

[0061] In an illustrative embodiment, the head 1 and the filter assembly 2 can be threadedly connected. The connecting portion 141 forms an internal thread, and the outer shell 21 of the filter assembly 2 forms an external thread that matches the internal thread of the connecting portion 141.

[0062] In an illustrative embodiment, the head 1 and the filter assembly 2 can be combined in a snap-fit ​​connection manner.

[0063] In such an embodiment, the housing 15 is detachably connected to the base 14 (for example, it can be threaded or snap-connected), so that when the water quality detector 3 and the drainage assembly 4 need to be repaired or replaced, the housing can be quickly opened for easy maintenance and servicing. By detachably connecting the base 14 to the filter assembly 2, when the filter element 22 of the filter assembly 2 needs to be cleaned or replaced, the base 14 can be easily separated from the filter assembly 2 for easy maintenance and servicing.

[0064] According to the embodiment of the present disclosure, a sealing gasket may be provided between the housing 15 and the base 14 to keep the accommodating cavity sealed.

[0065] Figure 3 Schematically shows Figure 2 A cross-sectional view of AA of the pre-filter is shown.

[0066] According to the embodiments of the present disclosure, 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 in 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. The waste water 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 from the water outlet channel 24 in the filter element 22 to the water outlet channel 16 on the machine head.

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

[0068] In an exemplary embodiment, the filter element 22 may be pressed between the base 14 and the housing 21. Figure 2 From the perspective shown, the filter element 22 can be located between the lower wall surface of the base 14 and the bottom wall of the housing 21 at a low pressure.

[0069] According to an embodiment of the present disclosure, the filter element may include but is not limited to polypropylene fiber cotton (PP cotton), activated carbon or ultrafiltration membrane.

[0070] Figure 4 The figure schematically shows a perspective view of a pre-filter according to an embodiment of the present disclosure with the housing removed from the first perspective. Figure 5 Schematically shows Figure 4 A second perspective view of the pre-filter shown, Figure 6 A perspective view of a base body according to an embodiment of the present disclosure is schematically shown.

[0071] According to the embodiments of the present disclosure, Figure 4 , Figure 5 and Figure 6 As shown, the head is provided 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 communicated with the filter assembly 2 to introduce tap water into the filter assembly 2. The second water inlet channel 12 is communicated with the filter assembly 2 to introduce waste water into the filter assembly 2. The one-way valve 13 is placed in the accommodating cavity and is arranged 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 disclosure, the first water inlet channel 11 and the second water inlet channel 12 pass through the substrate 14 to discharge tap water and waste water into the filter assembly 2 , and the filtered water is discharged from the water outlet channel 24 of the filter assembly 2 through the substrate 14 (from the water outlet channel 16 ).

[0073] In an illustrative embodiment, the first water inlet channel 11 has a first water outlet end 111 connected to the water inlet channel 23 of the filter assembly 2, and a first water inlet end located on the side wall of the body 14. The first water inlet channel can be formed on the substrate 14, or the first water inlet end and the first water outlet end 111 are formed on the substrate, and the first water inlet end and the second water inlet end can be connected through a pipeline.

[0074] It is understood that the first water inlet end and the second water inlet channel 12 may have a threaded structure to facilitate communication with an external pipeline. Alternatively, the first water inlet end and the second water inlet channel 12 may both protrude from the base and have an internal thread or an external thread structure to communicate with an external pipeline. Alternatively, the first water inlet end and the second water inlet channel 12 may be connected to a quick-connect connector.

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

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

[0077] In other exemplary 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 channel, the first water outlet channel is adapted to be connected to the main water outlet channel and to be connected to an external faucet to discharge the filtered water through the faucet; the second water outlet channel is adapted to be connected to the main water outlet channel and to be connected 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, in the absence of waste water flowing into the pre-filter, the pre-filter may filter the tap water and discharge it as filtered water.

[0079] According to an embodiment of the present disclosure, 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 the external sewer. The electric valve 42 is arranged on the drainage channel 41, and the electric valve 42 is opened in response to the total dissolved solid matter value exceeding the preset value, and at least a part of the wastewater in the second water inlet channel 162 is discharged through the drainage channel 41.

[0080] In an illustrative embodiment, the electric valve 42 may be a solenoid valve.

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

[0082] It is understood that the outlet of the drainage channel 41 may have a threaded structure to facilitate communication with an external pipeline. Alternatively, the outlet of the drainage channel 41 may protrude from the base and have an internal or external threaded structure to communicate with an external pipeline. Alternatively, the outlet of the drainage channel 41 may be connected to a quick-connect connector.

[0083] In this embodiment, the TDS sensor monitors the TDS value of the filtered water in real time. When the monitored TDS value of the filtered water exceeds a preset value, the solenoid valve opens, and the wastewater flowing out of the wastewater outlet of the external water purifier is discharged into the sewer pipe through the drainage channel 41, thereby suppressing the continued increase of the TDS value of the filtered water. When the monitored TDS value is lower than the low threshold, the solenoid valve closes, and the wastewater continues to flow into the filter assembly and mixes with the tap water.

[0084] According to the embodiments of the present disclosure, Figure 6 As shown, the first water inlet end 163 of the water outlet channel 16 is in communication with the water outlet channel 24 of the filter assembly 2. The filtered water from the filter assembly 2 flows into the water outlet channel 16 through the first water inlet end 163.

[0085] In an illustrative embodiment, the outlet ends of the first water outlet pipe and the second water outlet pipe may be formed on the base. The outlet ends of the first water outlet pipe and the second water outlet pipe may form an internal thread structure to facilitate communication with an external pipeline. Alternatively, the outlet ends of the first water outlet pipe and the second water outlet pipe may protrude from the base 14, and the outlet ends of the first water outlet pipe and the second water outlet pipe may form an internal thread or an external thread structure to facilitate communication with an external pipeline. Alternatively, the outlet end of the water outlet pipe 16 may be connected to a quick-connect connector.

[0086] According to the embodiments of the present disclosure, Figure 1 , Figure 4 , Figure 5 and Figure 6As 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 suitable for communicating with an external faucet to discharge the filtered water through the faucet. The second water outlet channel 162 is suitable for communicating 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 end and the water inlet end of the first water outlet channel 161, and the water outlet end and the water inlet end of the second water outlet channel 162 are both formed on the base.

[0088] In an exemplary embodiment, the first water outlet channel 161 and the second water outlet channel 162 may be formed in the base, or the water outlet and water inlet of the first water outlet channel 161 may be connected via a first pipe, and the water outlet and water inlet of the second water outlet channel 162 may be connected via a second pipe.

[0089] In an illustrative embodiment, the first water outlet channel 161 and the second water outlet channel 162 may have a common first water inlet end 163 , or the first water outlet channel 161 and the second water outlet channel 162 may respectively have water inlet ends connected to the water outlet channel 24 of the filter assembly 2 .

[0090] According to an embodiment of the present disclosure, 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 disclosure, 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 disclosure, the pre-filter further includes a display (not shown in the figure), which is disposed on the machine head 1 to display the total dissolved solids value of the filtered water in real time.

[0093] In an exemplary embodiment, the display may be packaged on the base 14 and the display surface of the display may be exposed.

[0094] In an illustrative embodiment, the pre-filter provided by the present disclosure may be installed under the kitchen.

[0095] The reverse osmosis water purifier in the related technology wastes at least 35% of tap water. The pre-filter provided by the present invention realizes the overall automatic collection and utilization of the wastewater of the reverse osmosis water purifier for mixed filtration and recycling, thereby achieving the function of zero wastewater of the water purifier, not wasting tap water, and also filtering the domestic tap water to improve the water quality.

[0096] As another aspect of the embodiments of the present disclosure, a water purification system is provided, comprising a water purifier and any of the above-mentioned pre-filters. The water purifier comprises a water inlet and a wastewater outlet. The second water inlet channel of any of the above-mentioned pre-filters is connected to the wastewater outlet, and the second water outlet channel of the pre-filter is connected to the wastewater outlet.

[0097] According to an embodiment of the present disclosure, the water purifier may be a reverse osmosis water purifier.

[0098] In the relevant technology, compared with commercial water purifiers, household water purifiers have their own unique characteristics. For example, for a family of five, each person drinks about 2L of water per day. In addition to cooking, making tea, etc., the total daily water consumption of the family is about 15~20L (the corresponding amount of wastewater generated is about 15~20L), and the water use time is mostly distributed in three time periods: 7~9 am, 11~13 noon, and 5~9 pm. Among them, water purifiers include pure water pressure tank type and non-pure water pressure tank type. For the former, the water production time is concentrated and the one-time water production volume is large, for example, 3~5 times a day, 3~5L of water each time; for the latter, the water production time is relatively dispersed, and the number of water production times is large, and the water production volume is small each time, for example, 5~10 times a day, 0.2~3L each time.

[0099] Based on the above characteristics of the water purifier, the present invention provides a pre-filter between the wastewater outlet and the water inlet of the water purifier, and the pre-filter is connected to the tap water pipe at the same time, so that the wastewater generated by the water purifier is mixed with the tap water in the water inlet channel of the pre-filter and filtered by the filter element of the pre-filter, wherein the first water outlet channel of the pre-filter can be connected to other household water facilities, such as washing machines, toilets, washbasins, water heaters and showers, etc. Based on this, the filtered water generated by the pre-filter can be replaced from time to time, so that the impurity content of the filtered water entering the water inlet end of the water purifier, that is, the TDS (Total Dissolved Solids) value remains basically unchanged, thereby realizing "wastewater-free" water production of the water purifier.

[0100] The embodiments of the present disclosure are described above. However, these embodiments are only for illustrative purposes and are not intended to limit the scope of the present disclosure. Although the embodiments are described above separately, this does not mean that the measures in the various embodiments cannot be used in combination to advantage. The scope of the present disclosure is defined by the attached claims and their equivalents. Without departing from the scope of the present disclosure, those skilled in the art may make a variety of substitutions and modifications, which should all fall within the scope of the present disclosure.

Claims

1. A pre-filter, characterized in that: include: The head has a receiving cavity formed inside, which is suitable for receiving tap water from a tap water pipe, as well as receiving waste water from an external water purifier and the tap water; A filter assembly connected to the machine head, the filter assembly is suitable for mixing and filtering the waste water and the tap water, and allowing the mixed and filtered filtered water to be discharged from the machine head; A water quality detector is installed in the containing cavity, and the water quality detector is suitable for obtaining the total dissolved solid matter value of the filtered water in real time; as well as A drainage component is arranged on the machine head, and is suitable for discharging at least part of the wastewater when the total dissolved solids value exceeds a preset value, so that the total dissolved solids value of the filtered water is maintained within the preset value.

2. The pre-filter according to claim 1, characterized in that: The machine head is provided with: a first water inlet channel, connected to the filter assembly to introduce the tap water into the filter assembly; a second water inlet channel, communicating with the filter assembly to introduce the wastewater into the filter assembly; as well as A one-way valve is placed in the accommodating chamber and is arranged 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 comprises: 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; The electric valve is arranged on the drainage channel. The electric valve opens in response to the total dissolved solid matter value exceeding the preset value, so as to discharge at least a part of the wastewater in the second water inlet channel through the drainage channel.

4. The pre-filter according to claim 3, characterized in that: The filter assembly comprises: An outer shell, forming a cavity inside; A filter element is placed in the cavity, and a water inlet channel is formed between the outer wall of the filter element and the inner wall of the shell; Among them, the waste water and the tap water from the machine head are filtered by the filter element from the water inlet channel, and then flow out from the water outlet channel in the filter element to the water outlet channel on the machine head.

5. The pre-filter according to claim 4, characterized in that: The water outlet channel comprises: A main water outlet channel, connected to the water outlet flow channel; a first water outlet channel, adapted to communicate with the main water outlet channel and communicate with an external faucet so as 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 be connected to the water inlet of the water purifier, so that at least a portion of the filtered water can be used as the inlet water 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 polypropylene fiber cotton, activated carbon or ultrafiltration membrane.

8. The pre-filter according to any one of claims 4 to 7, characterized in that: The machine head comprises: A base body connected to the shell; A shell, detachably connected to the base body, and defining the accommodating cavity with the base body; The first water inlet channel and the second water inlet channel pass through the base to discharge the tap water and the waste water into the filter assembly, and the filtered water passes through the base and is discharged from the drainage channel.

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

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

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