Kitchen water purifier

Abstract

The utility model discloses a kitchen water purifier which comprises a filter element, a normal temperature water tank, a hot water tank and an instant heating faucet, a heating resistor and a temperature sensor are arranged in the hot water tank, and a heating film is arranged in the instant heating faucet; a water outlet of the filter element is respectively connected with a water inlet of the normal-temperature water tank, a water inlet of the hot water tank and a water inlet of the instant heating faucet; a water outlet of the normal-temperature water tank and a water outlet of the hot water tank are respectively connected with a water inlet of the instant heating faucet; and a water outlet of the normal-temperature water tank is connected with a water inlet of the filter element. The under-kitchen water purifier disclosed by the utility model not only can realize the functions of high short-time water outlet speed and sustainable water outlet of hot water, but also can reduce the scaling of the filter element and reduce the TDS (total dissolved solid) value of water in a head cup.

Description

Technical Field

[0001] The utility model belongs to the technical field of water purification equipment, and in particular relates to an under-sink water purifier. Background Art

[0002] Users have an increasingly higher demand for purified water, requiring water purifiers to provide not only room temperature water but also hot water.

[0003] Existing water purifiers generally provide hot water by setting up a separate hot water tank or using instant hot water faucets. The advantage of a hot water tank is that it can store a large amount of hot water and has a fast water output speed. However, it has the problems of high insulation energy consumption and large space occupation. In addition, when the user's demand for hot water is large, the hot water tank cannot continue to provide hot water to the user after the hot water is emptied. The advantage of an instant hot water faucet is that it does not consume heat preservation energy, but due to power limitations, its water output speed is slow. In most cases, users need to wait for a long time each time they use hot water.

[0004] Therefore, the existing water purifiers are all insufficient in terms of user experience, and it is necessary to conduct in-depth research on the existing water purifiers to solve the above problems. Utility Model Content

[0005] In order to overcome the above problems, the inventors conducted in-depth research and proposed an under-kitchen water purifier, which includes a filter element, a normal temperature water tank, a hot water tank and an instant hot water faucet, wherein the hot water tank is provided with a heating resistor and a temperature sensor, and the instant hot water faucet is provided with a heating film; the water outlet of the filter element is respectively connected to the water inlet of the normal temperature water tank, the water inlet of the hot water tank and the water inlet of the instant hot water faucet; the water outlet of the normal temperature water tank and the water outlet of the hot water tank are respectively connected to the water inlet of the instant hot water faucet; the water outlet of the normal temperature water tank is connected to the water inlet of the filter element.

[0006] Preferably, a clean water path is provided between the water outlet of the filter element and the water inlet of the normal temperature water tank, the water inlet of the hot water tank, and the water inlet of the instant hot water faucet, respectively; a first solenoid valve is provided on the clean water path between the water outlet of the filter element and the water inlet of the normal temperature water tank, a second solenoid valve is provided on the clean water path between the water outlet of the filter element and the water inlet of the hot water tank, and a third solenoid valve is provided on the clean water path between the water outlet of the filter element and the water inlet of the instant hot water faucet;

[0007] A normal temperature water path is provided between the water outlet of the normal temperature water tank and the water inlet of the instant hot water faucet, and a gear pump is provided on the normal temperature water path; a hot water path is provided between the water outlet of the hot water tank and the water inlet of the instant hot water faucet, and an impeller pump is provided on the hot water path; an instant hot water path is provided between the water outlet of the normal temperature water tank and the water inlet of the instant hot water faucet, and a diaphragm pump is provided on the instant hot water path;

[0008] A reflux waterway is provided between the water outlet of the normal temperature water tank and the water inlet of the filter element, and a fourth solenoid valve is provided on the reflux waterway.

[0009] Preferably, a first liquid level sensor is provided in the normal temperature water tank to detect the water level in the normal temperature water tank;

[0010] When the water level in the normal temperature water tank is higher than a preset first high water level value, the first solenoid valve is closed, and the filter element stops supplying water to the normal temperature water tank;

[0011] When the water level in the normal temperature water tank is higher than a preset first low water level value, the gear pump is started to discharge the normal temperature water in the normal temperature water tank along the normal temperature water path through the instant hot water faucet;

[0012] When the water level in the normal temperature water tank is lower than a preset first low water level value, the gear pump is closed, the third solenoid valve is opened, and the clean water produced by the filter element is discharged along the clean water waterway through the instant hot water faucet.

[0013] Preferably, a second liquid level sensor is provided in the hot water tank to detect the water level in the hot water tank;

[0014] When the water level in the hot water tank is higher than a preset second highest water level value, the second solenoid valve is closed, and the filter element stops supplying water to the hot water tank;

[0015] When the water level in the hot water tank is higher than a preset second lowest water level value, the impeller pump is started to discharge the hot water in the hot water tank along the hot water waterway through the instant hot water faucet;

[0016] When the water level in the hot water tank is lower than a preset second low water level value, the impeller pump is turned off and the diaphragm pump is started to discharge the normal temperature water in the normal temperature water tank along the instant hot water circuit through the instant hot water faucet. At the same time, the heating membrane in the instant hot water faucet works to heat the normal temperature water flowing through the instant hot water faucet.

[0017] Preferably, after the filter element completes filtering the tap water, the fourth solenoid valve is opened to transport the normal temperature water in the normal temperature water tank along the reflux waterway to the water inlet of the filter element, so that the water inlet of the filter element is clean water.

[0018] Preferably, when the normal temperature water in the normal temperature water tank is not used for more than a preset time, the fourth solenoid valve is opened to transport the normal temperature water in the normal temperature water tank along the reflux waterway to the water inlet of the filter element for re-filtration.

[0019] Preferably, the normal temperature water circuit, the instant hot water circuit, and the hot water circuit are respectively provided with flow meters to measure the flow of water.

[0020] Preferably, one-way valves are respectively provided on the normal temperature water circuit, the instant hot water circuit and the return water circuit, so that water can only flow along the water outlet of the normal temperature water tank toward the water inlet of the instant hot water faucet or the filter element.

[0021] Preferably, a TDS probe is provided in the normal temperature water tank to detect the TDS value of the normal temperature water in the normal temperature water tank; when the TDS value of the normal temperature water in the normal temperature water tank is higher than a preset value, an alarm is issued.

[0022] Preferably, the filter element comprises an RO membrane filter element, and a booster pump is provided at the water inlet of the filter element; a wastewater waterway is also provided at the water outlet of the filter element, and a wastewater regulating valve is provided on the wastewater waterway.

[0023] The utility model has the following beneficial effects:

[0024] The utility model discloses an under-kitchen water purifier, comprising a filter element, a normal temperature water tank, a hot water tank and an instant hot water faucet, wherein a heating resistor and a temperature sensor are arranged in the hot water tank, and a heating film is arranged in the instant hot water faucet; the water outlet of the filter element is respectively connected with the water inlet of the normal temperature water tank, the water inlet of the hot water tank and the water inlet of the instant hot water faucet; the water outlet of the normal temperature water tank and the water outlet of the hot water tank are respectively connected with the water inlet of the instant hot water faucet; the water outlet of the normal temperature water tank is connected with the water inlet of the filter element. The under-kitchen water purifier disclosed by the utility model can not only realize the function of fast and continuous hot water outlet in a short time, but also reduce the scaling of the filter element and reduce the TDS value of the first cup of water. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the utility model or the prior art, the following briefly introduces the drawings required for use in the embodiments or the prior art description. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. In addition, in the drawings, the same parts are marked with the same reference numerals, and the drawings are not drawn according to the actual scale.

[0026] Figure 1 It is a structural schematic diagram of an under-sink water purifier according to a specific embodiment of the utility model.

[0027] Description of Figure Numbers

[0028] 100-Under kitchen water purifier;

[0029] 10-filter element; 11-clean water circuit; 111-first solenoid valve; 112-second solenoid valve; 113-third solenoid valve; 12-waste water circuit; 121-waste water regulating valve; 13-boosting pump;

[0030] 20-normal temperature water tank; 21-normal temperature water circuit; 211-gear pump; 22-instant hot water circuit; 221-diaphragm pump; 23-return water circuit; 231-fourth solenoid valve; 24-first liquid level sensor; 25-TDS probe;

[0031] 30-hot water tank; 31-hot water circuit; 311-impeller pump; 32-heating resistor; 33-temperature sensor; 34-second liquid level sensor;

[0032] 40-Instant hot water tap;

[0033] L-flow meter; D-check valve. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical solution and advantages of the embodiments disclosed in the present utility model clearer, the technical solution in the embodiments of the present utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the present utility model. Obviously, the described embodiments are part of the embodiments of the present disclosure, not all of the embodiments. Based on the embodiments in the present utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present utility model.

[0035] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. Specific embodiments

[0037] The utility model provides an under-sink water purifier (100), such as Figure 1 As shown, it comprises a filter element (10), a normal temperature water tank (20), a hot water tank (30) and an instant hot water faucet (40); a heating resistor (32) and a temperature sensor (33) are arranged in the hot water tank (30), and a heating film is arranged in the instant hot water faucet (40); the water outlet of the filter element (10) is respectively connected to the water inlet of the normal temperature water tank (20), the water inlet of the hot water tank (30) and the water inlet of the instant hot water faucet (40); the water outlet of the normal temperature water tank (20) and the water outlet of the hot water tank (30) are respectively connected to the water inlet of the instant hot water faucet (40); and the water outlet of the normal temperature water tank (20) is connected to the water inlet of the filter element (10).

[0038] After extensive research, it was found that in most cases, the amount of hot water used by users at one time is not large, and the under-sink water purifier (100) is fully capable of supplying the amount of hot water using a separate hot water tank (30). In this case, the hot water flow rate is high, meeting the user's usage requirements. However, there are a few cases where the amount of hot water used by users at one time exceeds the carrying capacity of the hot water tank (30), but is generally less than twice the volume of the hot water tank (30). In this case, the solution of using a separate hot water tank (30) for heating will cause the user to wait for a long time for the hot water tank (30) to heat.

[0039] On one hand, the present embodiment makes up for the deficiencies of conventional water purifiers by using a hot water tank (30) and an instant hot water faucet (40) in combination, thereby achieving the function of hot water output at a fast speed and sustainable water output in a short time. Specifically, when a user takes hot water, hot water is first supplied through the hot water tank (30) to achieve a high flow rate of hot water supply. When the hot water in the hot water tank (30) is emptied, the instant hot water faucet (40) is used to continuously heat the room temperature water to produce hot water, thereby achieving a sustainable supply of hot water.

[0040] On the other hand, in this embodiment, a return water path (23) is provided between the water outlet of the normal temperature water tank (20) and the water inlet of the filter element (10), and concentrated tap water in the filter element (10) is replaced with clean water through the return water path (23), thereby reducing scaling of the filter element (10) and lowering the TDS value of the first cup of water.

[0041] In a more preferred embodiment, a clean water path (11) is provided between the water outlet of the filter element (10) and the water inlet of the normal temperature water tank (20), the water inlet of the hot water tank (30), and the water inlet of the instant hot water faucet (40), respectively; a first solenoid valve (111) is provided on the clean water path (11) between the water outlet of the filter element (10) and the water inlet of the normal temperature water tank (20), a second solenoid valve (112) is provided on the clean water path (11) between the water outlet of the filter element (10) and the water inlet of the hot water tank (30), and a third solenoid valve (113) is provided on the clean water path (11) between the water outlet of the filter element (10) and the water inlet of the instant hot water faucet (40);

[0042] A normal temperature water path (21) is provided between the water outlet of the normal temperature water tank (20) and the water inlet of the instant hot water faucet (40), and a gear pump (211) is provided on the normal temperature water path (21); a hot water path (31) is provided between the water outlet of the hot water tank (30) and the water inlet of the instant hot water faucet (40), and an impeller pump (311) is provided on the hot water path (31); an instant hot water path (22) is provided between the water outlet of the normal temperature water tank (20) and the water inlet of the instant hot water faucet (40), and a diaphragm pump (221) is provided on the instant hot water path (22);

[0043] A reflux water path (23) is provided between the water outlet of the normal temperature water tank (20) and the water inlet of the filter element (10), and a fourth solenoid valve (231) is provided on the reflux water path (23).

[0044] In this embodiment, the normal temperature water circuit (21) uses a gear pump (211), which can ensure the normal temperature water supply speed under low cost conditions; the hot water circuit (31) uses an impeller pump (311) to extract hot water, which has a simple structure and a long service life; the instant hot water circuit (22) uses a diaphragm pump (221), which makes the water flow entering the instant hot water faucet (40) more stable, thereby making the outlet temperature and flow of the heated hot water more stable.

[0045] In a more preferred embodiment, a first liquid level sensor (24) is provided in the normal temperature water tank (20) to detect the water level in the normal temperature water tank (20);

[0046] When the water level in the normal temperature water tank (20) is higher than a preset first high water level value, the first solenoid valve (111) is closed, and the filter element (10) stops supplying water to the normal temperature water tank (20);

[0047] When the water level in the normal temperature water tank (20) is higher than a preset first low water level value, the gear pump (211) is started to discharge the normal temperature water in the normal temperature water tank (20) along the normal temperature water path (21) through the instant hot water tap (40);

[0048] When the water level in the normal temperature water tank (20) is lower than a preset first low water level value, the gear pump (211) is closed, the third solenoid valve (113) is opened, and the clean water produced by the filter element (10) is discharged along the clean water path (11) through the instant hot water tap (40).

[0049] In this embodiment, when the user has a demand for normal temperature water, water is supplied through the normal temperature water tank (20), and the water output rate can be greater than 6L / min; when the normal temperature water tank (20) is emptied, water is directly supplied through the filter element (10) to ensure the continuity of water use.

[0050] In a more preferred embodiment, a second liquid level sensor (34) is provided in the hot water tank (30) to detect the water level in the hot water tank (30);

[0051] When the water level in the hot water tank (30) is higher than a preset second highest water level value, the second solenoid valve (112) is closed, and the filter element (10) stops supplying water to the hot water tank (30);

[0052] When the water level in the hot water tank (30) is higher than a preset second lowest water level value, the impeller pump (311) is started to discharge the hot water in the hot water tank (30) along the hot water water path (31) through the instant hot water tap (40);

[0053] When the water level in the hot water tank (30) is lower than a preset second lowest water level value, the impeller pump (311) is turned off and the diaphragm pump (221) is started to discharge the normal temperature water in the normal temperature water tank (20) along the instant hot water path (22) through the instant hot water faucet (40). At the same time, the heating membrane in the instant hot water faucet (40) is operated to heat the normal temperature water flowing through the instant hot water faucet (40).

[0054] In this embodiment, the hot water tank (30) can ensure the water supply speed when users need hot water in most cases. The hot water supply speed can be greater than 2L / min, which ensures the continuous water supply of users.

[0055] Specifically, if the volume of the hot water tank (30) is too large, it will lead to problems such as excessive heat preservation energy consumption and excessive volume occupation; if the volume of the hot water tank (30) is too small, it will be difficult to meet the user's demand for rapid hot water supply in most cases. According to a large number of surveys, the volume of the hot water tank (30) in this embodiment is 0.5-3L, preferably 1L.

[0056] In a more preferred embodiment, after the filter element (10) completes filtering the tap water, the fourth solenoid valve (231) is opened to transport the normal temperature water in the normal temperature water tank (20) along the return water path (23) to the water inlet of the filter element (10), so that the water inlet of the filter element (10) is clean water.

[0057] Specifically, when the water level in the normal temperature water tank (20) is higher than the preset first high water level value, and the water level in the hot water tank (30) is higher than the preset second high water level value, the filter element (10) stops producing water; at this time, a large amount of concentrated tap water with a high TDS value is stored in the filter element (10). If the filter element (10) does not work for a long time, scale is easily formed on the surface of the filter membrane in the filter element (10), which affects its service life, and the TDS value of the first cup of water when the user takes water next time is high. In this embodiment, the concentrated tap water in the filter element (10) is replaced with clean water through the reflux water path (23), which can effectively reduce the scaling of the filter element (10) and reduce the TDS value of the first cup of water.

[0058] In a more preferred embodiment, when the normal temperature water in the normal temperature water tank (20) is not used for more than a preset time, the fourth solenoid valve (231) is opened to transport the normal temperature water in the normal temperature water tank (20) along the return water path (23) to the water inlet of the filter element (10) for re-filtration.

[0059] Specifically, when the normal temperature water in the normal temperature water tank (20) is not used for a long time, bacteria are easily bred. In this embodiment, the normal temperature water in the normal temperature water tank (20) is re-filtered through the return water path (23) to ensure the cleanliness of the normal temperature water in the normal temperature water tank (20). More specifically, in this embodiment, the "preset time" is usually set to 24h, 48h, 72h, etc., and can be set according to the actual use scenario.

[0060] In a more preferred embodiment, flow meters (L) are respectively provided on the normal temperature water circuit (21), the hot water circuit (22), and the hot water circuit (31) to measure the flow rate of water.

[0061] In a more preferred embodiment, one-way valves (D) are respectively provided on the normal temperature water circuit (21), the instant hot water circuit (22), and the return water circuit (23), so that water can only flow along the water outlet of the normal temperature water tank (20) toward the water inlet of the instant hot water faucet (40) or the filter element (10), thereby preventing the purified water from being contaminated due to water circuit backflow.

[0062] In a more preferred embodiment, a TDS probe (25) is provided in the normal temperature water tank (20) to detect the TDS value of the normal temperature water in the normal temperature water tank (20); when the TDS value of the normal temperature water in the normal temperature water tank (20) is higher than a preset value, an alarm is issued. Specifically, when the TDS value of the normal temperature water in the normal temperature water tank (20) is higher than a preset value, the user can be reminded to re-filter the normal temperature water in the normal temperature water tank (20), or to replace the filter element (10) to ensure the safety of drinking water.

[0063] In a more preferred embodiment, the filter element (10) comprises an RO membrane filter element, the water inlet of the filter element (10) is provided with a booster pump (13); the water outlet of the filter element (10) is also provided with a wastewater waterway (12), and the wastewater waterway (12) is provided with a wastewater regulating valve (121). By adjusting the opening of the wastewater regulating valve (121), the pure waste ratio of the RO membrane filter element can be adjusted.

[0064] In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "front", "rear", etc. indicate positions or positional relationships based on the working state of the present invention, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third", "fourth", and "fifth" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0065] The above are only specific embodiments of the present invention, so that those skilled in the art can understand or implement the present disclosure. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An under-sink water purifier, characterized in that: The invention comprises a filter element (10), a normal temperature water tank (20), a hot water tank (30) and an instant hot water faucet (40); the hot water tank (30) is provided with a heating resistor (32) and a temperature sensor (33), and the instant hot water faucet (40) is provided with a heating film; the water outlet of the filter element (10) is respectively connected to the water inlet of the normal temperature water tank (20), the water inlet of the hot water tank (30) and the water inlet of the instant hot water faucet (40); the water outlet of the normal temperature water tank (20) and the water outlet of the hot water tank (30) are respectively connected to the water inlet of the instant hot water faucet (40); and the water outlet of the normal temperature water tank (20) is connected to the water inlet of the filter element (10).

2. The under-sink water purifier according to claim 1, characterized in that: A clean water path (11) is provided between the water outlet of the filter element (10) and the water inlet of the normal temperature water tank (20), the water inlet of the hot water tank (30), and the water inlet of the instant hot water faucet (40), respectively; a first solenoid valve (111) is provided on the clean water path (11) between the water outlet of the filter element (10) and the water inlet of the normal temperature water tank (20), a second solenoid valve (112) is provided on the clean water path (11) between the water outlet of the filter element (10) and the water inlet of the hot water tank (30), and a third solenoid valve (113) is provided on the clean water path (11) between the water outlet of the filter element (10) and the water inlet of the instant hot water faucet (40); A normal temperature water path (21) is provided between the water outlet of the normal temperature water tank (20) and the water inlet of the instant hot water faucet (40), and a gear pump (211) is provided on the normal temperature water path (21); a hot water path (31) is provided between the water outlet of the hot water tank (30) and the water inlet of the instant hot water faucet (40), and an impeller pump (311) is provided on the hot water path (31); an instant hot water path (22) is provided between the water outlet of the normal temperature water tank (20) and the water inlet of the instant hot water faucet (40), and a diaphragm pump (221) is provided on the instant hot water path (22); A reflux waterway (23) is provided between the water outlet of the normal temperature water tank (20) and the water inlet of the filter element (10), and a fourth solenoid valve (231) is provided on the reflux waterway (23).

3. The under-sink water purifier according to claim 2, characterized in that: A first liquid level sensor (24) is provided in the normal temperature water tank (20) to detect the water level in the normal temperature water tank (20); When the water level in the normal temperature water tank (20) is higher than a preset first high water level value, the first solenoid valve (111) is closed, and the filter element (10) stops supplying water to the normal temperature water tank (20); When the water level in the normal temperature water tank (20) is higher than a preset first low water level value, the gear pump (211) is started to discharge the normal temperature water in the normal temperature water tank (20) along the normal temperature water path (21) through the instant hot water tap (40); When the water level in the normal temperature water tank (20) is lower than a preset first low water level value, the gear pump (211) is closed, the third solenoid valve (113) is opened, and the clean water produced by the filter element (10) is discharged along the clean water path (11) through the instant hot water tap (40).

4. The under-sink water purifier according to claim 2, characterized in that: A second liquid level sensor (34) is provided in the hot water tank (30) to detect the water level in the hot water tank (30); When the water level in the hot water tank (30) is higher than a preset second high water level value, the second solenoid valve (112) is closed, and the filter element (10) stops supplying water to the hot water tank (30); When the water level in the hot water tank (30) is higher than a preset second lowest water level value, the impeller pump (311) is started to discharge the hot water in the hot water tank (30) along the hot water water path (31) through the instant hot water tap (40); When the water level in the hot water tank (30) is lower than a preset second low water level value, the impeller pump (311) is turned off and the diaphragm pump (221) is started to discharge the normal temperature water in the normal temperature water tank (20) along the instant hot water path (22) through the instant hot water faucet (40), and at the same time, the heating membrane in the instant hot water faucet (40) is operated to heat the normal temperature water flowing through the instant hot water faucet (40).

5. The under-sink water purifier according to claim 2, characterized in that: After the filter element (10) has completed filtering the tap water, the fourth solenoid valve (231) is opened to transport the normal temperature water in the normal temperature water tank (20) along the return water path (23) to the water inlet of the filter element (10), so that the water inlet of the filter element (10) is clean water.

6. The under-sink water purifier according to claim 2, characterized in that: When the normal temperature water in the normal temperature water tank (20) has not been used for a preset time, the fourth solenoid valve (231) is opened to transport the normal temperature water in the normal temperature water tank (20) along the return water path (23) to the water inlet of the filter element (10) for re-filtration.

7. The under-sink water purifier according to claim 2, characterized in that: The normal temperature water circuit (21), the instant hot water circuit (22), and the hot water circuit (31) are respectively provided with flow meters (L) to measure the flow of water.

8. The under-sink water purifier according to claim 2, characterized in that: The normal temperature water circuit (21), the instant hot water circuit (22), and the return water circuit (23) are respectively provided with a one-way valve (D) so that water can only flow along the water outlet of the normal temperature water tank (20) toward the water inlet of the instant hot water faucet (40) or the filter element (10).

9. The under-sink water purifier according to claim 1, characterized in that: A TDS probe (25) is provided in the normal temperature water tank (20) to detect the TDS value of the normal temperature water in the normal temperature water tank (20); When the TDS value of the normal temperature water in the normal temperature water tank (20) is higher than a preset value, an alarm is issued.

10. The under-sink water purifier according to claim 1, characterized in that: The filter element (10) comprises an RO membrane filter element (10), the water inlet of the filter element (10) is provided with a booster pump (13); the water outlet of the filter element (10) is also provided with a wastewater waterway (12), and the wastewater waterway (12) is provided with a wastewater regulating valve (121).

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