CN205367922U - Water purifying system - Google Patents

Abstract

The utility model discloses a water purification system, which comprises: a composite filter element, a booster pump, a water inlet solenoid valve, a high pressure switch and a waste water valve. The composite filter element has a water source inlet, a pure water outlet and a concentrated water outlet, the booster pump is connected to the water source inlet of the composite filter element, the water inlet solenoid valve is connected in series with the booster pump, and the high pressure switch It is connected with the pure water outlet of the composite filter element, the high pressure switch is connected with the booster pump and the water inlet solenoid valve respectively, and the high pressure switch controls the booster pump and the water inlet solenoid valve according to the outlet water pressure. valve, and the waste water valve is connected with the concentrated water outlet of the composite filter element. According to the water purification system of the utility model, the water flow can enter from the water source inlet under the action of the high-voltage switch, and the pure water purified by the composite filter element can flow out through the pure water outlet for the user to drink, thereby better satisfying the user's needs drinking water quality requirements.

Description

water purification system

technical field

The utility model relates to the technical field of water purification, in particular to a water purification system.

Background technique

In related technologies, water purification equipment usually uses PP cotton, activated carbon, etc. as pre-filter elements, and then connects RO filter elements in series (wherein, RO is the abbreviation of Reverse Osmosis in English, and reverse osmosis in Chinese). The water purification system is formed, and the water is further purified by the water purification system. The pipeline connections of the entire water purification system are complicated, and it is inconvenient to install and replace parts. The risk of water leakage through multi-joint connections is high. Moreover, the service life of each component of the multi-stage filter element is inconsistent. When replacing the filter element, consumers need to replace as many as three to five levels. Frequent purchase of filter elements is required and professional installers need to replace them. Poor experience and high overall cost.

Utility model content

The utility model aims to solve one of the technical problems in the related art at least to a certain extent. Therefore, the utility model proposes a water purification system, which reduces the number of joints of the composite filter element and can meet the user's demand for water quality.

The water purification system according to the embodiment of the utility model includes: a composite filter element, the composite filter element has a water source inlet, a pure water outlet and a concentrated water outlet; a booster pump, the booster pump is connected to the water source inlet of the composite filter element Water inlet solenoid valve, the water inlet solenoid valve is connected in series with the booster pump; high pressure switch, the high pressure switch is connected with the pure water outlet of the composite filter element, and the high pressure switch is connected with the booster pump respectively It is connected with the water inlet solenoid valve, and the high pressure switch controls the booster pump and the water inlet solenoid valve according to the water outlet pressure; the waste water valve, the waste water valve is connected with the concentrated water outlet of the composite filter element.

According to the water purification system of the embodiment of the utility model, the water flow can enter the water purification system from the water source inlet under the action of the high-pressure switch, and the pure water purified by the composite filter element can flow out for the user to drink through the pure water outlet, while the purified water purified by the composite filter element The final concentrated water can flow out through the concentrated water outlet under the control of the waste water valve, thereby better meeting the user's requirements for drinking water quality.

In addition, the water purification system according to the above-mentioned embodiments of the utility model can also have the following additional technical features:

According to an embodiment of the present utility model, the water purification system further includes a pre-filter, and the pre-filter is connected in series upstream of the water inlet solenoid valve and the booster pump.

According to an embodiment of the present invention, the pure water outlet of the composite filter element is connected with a one-way valve connected in series with the high pressure switch.

According to an embodiment of the present utility model, the waste water valve is a combination valve that is a passageway in a fully open state and a waste water proportional valve in a closed state.

According to some embodiments of the present utility model, the composite filter element includes: a housing on which the water source inlet, the pure water outlet, and the concentrated water outlet are formed; a composite filter element body, the composite filter element body Set in the housing, the composite filter element body includes a plurality of filter element layers, the plurality of filter element layers include a pretreatment filter element and a fine filter layer, and the fine filter layer separates the water source inlet, the pure water outlet and the outlet of the concentrated water, and the pretreatment filter element is separated from the inlet of the water source and the fine filter layer.

Further, the composite filter element body also includes an upper end cover and a lower end cover arranged at intervals along the vertical direction, the upper end cover is connected to the fine filter layer, the lower end cover is connected to the pretreatment filter element, and the pretreatment filter element is connected to the lower end cover. The treatment filter element and the fine filter layer are nested in sequence from outside to inside.

Optionally, the upper end of the housing is open and the lower end is closed, and the upper end of the housing is provided with a gland for positioning the composite filter body, and the gland is detachably connected to the housing for positioning The composite filter body.

Further, the composite filter body also includes a handle.

Optionally, the plurality of filter core layers further include a folded PP layer, and the folded PP layer is arranged between the water source inlet and the pretreatment filter core.

Optionally, the pretreatment filter element includes a PP non-woven fabric wrapping layer and an activated carbon fiber wrapping layer sequentially stacked along the water flow direction, and the fine filtration layer is a reverse osmosis membrane, an ultrafiltration membrane or a nanofiltration membrane.

Description of drawings

Fig. 1 is a schematic diagram of a water purification system according to an embodiment of the present invention.

Fig. 2 is a schematic diagram of a composite filter element of a water purification system according to an embodiment of the present invention.

Fig. 3 is a schematic diagram of the composite filter element body of the water purification system according to the embodiment of the present invention.

FIG. 4 is a sectional view of FIG. 3 .

Reference signs:

Water purification system 100, composite filter element 110, water source inlet 111, pure water outlet 112, concentrated water outlet 113, water inlet 101, pure water inlet 102, concentrated water inlet 103, booster pump 120, water inlet solenoid valve 130, high pressure switch 140 , waste water valve 150, pre-filter 160, one-way valve 170, housing 114, composite filter body 115, pretreatment filter 116, fine filter layer 117, upper end cover 118, lower end cover 119, gland 104, handle 105, Folded PP layer 106, hook 108, slot 109, sealing ring 121, sealing cup 122, sealing pad 123, PP non-woven fabric winding layer 126, activated carbon fiber winding layer 127.

detailed description

Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary and are intended to explain the present invention, but should not be construed as limiting the present invention.

The water purification system 100 according to the embodiment of the present utility model will be described in detail below with reference to FIG. 1 to FIG. 4 .

1 to 4 , the water purification system 100 according to the embodiment of the present utility model includes a composite filter element 110 , a booster pump 120 , a water inlet solenoid valve 130 , a high pressure switch 140 and a waste water valve 150 .

Specifically, the composite filter element 110 can have a water source inlet 111, a pure water outlet 112 and a concentrated water outlet 113, the booster pump 120 can be connected to the water source inlet 111 of the composite filter element 110, and the water inlet solenoid valve 130 can be connected in series with the booster pump 120. Then, the high-pressure switch 140 can be connected with the pure water outlet 112 of the composite filter element 110, the high-pressure switch 140 can be connected with the booster pump 120 and the water inlet solenoid valve 130 respectively, and the high-pressure switch 140 can control the booster pump 120 and the water inlet according to the outlet water pressure. The solenoid valve 130 and the waste water valve 150 can be connected with the concentrated water outlet 113 of the composite filter element 110 .

Wherein, the water purification system 100 may further include a water inlet 101 , a pure water outlet 102 and a concentrated water outlet 103 respectively communicating with the water inlet 111 , the pure water outlet 112 and the concentrated water outlet 113 of the composite filter element 110 .

In addition, the water purification system 100 further includes an electric control board (not shown in the figure). When the user turns on the water tap, the high-voltage switch 140 is pressure-relieved and closed, and the high-voltage switch 140 can send a signal to the electric control board, and the electric control board can be turned on. The booster pump 120 is started simultaneously with the water inlet solenoid valve 130. At this time, the water purification system 100 starts to deliver water from the water inlet 101 to the composite filter element 110 for water production.

When the user closes the water tap, the high-pressure switch 140 is disconnected under pressure, and the high-voltage switch 140 can send a signal to the electric control board, and the electric control board will close the water inlet solenoid valve 130 and the booster pump 120. At this time, the water purification system 100 will stop. When the water is delivered into the composite filter element 110, the water production is stopped.

According to the water purification system 100 of the embodiment of the utility model, the water flow can enter the water purification system 100 under the action of the high-voltage switch 140, and the pure water purified by the composite filter element 110 can flow out for the user to drink through the pure water outlet 112, and after the composite The concentrated water purified by the filter element 110 can flow out through the concentrated water outlet 113 under the control of the waste water valve 150, thereby better meeting the user's requirements for drinking water quality.

In addition, the high pressure switch 140 is directly used to control the on-off of the booster pump 120 and the water inlet solenoid valve 130, without using a water storage tank to store water, thereby avoiding secondary pollution of pure water in the water storage tank. The utility model adopts the composite filter core 110 as the filter element, which can realize the purpose of supplying a large amount of pure water and improve the filtration efficiency, so that the user can obtain pure water quickly without setting a water storage tank.

Referring to FIG. 1 , the water purification system 100 may further include a pre-filter 160 , and the pre-filter 160 may be connected in series upstream of the water inlet solenoid valve 130 and the booster pump 120 . The pre-filter 160 can pre-filter the water entering the water purification system 100 from the water inlet 101, and can effectively prevent or reduce impurities such as sediment, particles, rust, etc. The service life of the booster pump 120 is extended. Here, it should be noted that “upstream” can be understood as upstream in the flow direction of water flowing through the water purification system 100 .

When the water purification system 100 is working normally, the water flow can first enter the pre-filter 160 through the water inlet 101 for pre-filtering, then flow through the water inlet solenoid valve 130, and then enter the composite filter element 110 after being pressurized by the booster pump 120 filter further. Thus, the content of impurities in the water entering the composite filter element 110 such as silt, particles, rust, etc. can be relatively reduced, thereby ensuring the filtering effect of the composite filter element 110 to a certain extent and prolonging the service life of the composite filter element 110.

Of course, the pre-filter 160 can also be other components with filtering function. The present invention does not limit the specific form of the pre-filter 160 , and it can be adaptively selected according to needs in practical applications.

As shown in FIG. 1 , the pure water outlet 112 of the composite filter element 110 may be connected with a one-way valve 170 connected in series with the high pressure switch 140 . The pure water filtered by the water purification system 100 can flow out from the pure water outlet 112 of the composite filter element 110, pass through the one-way valve 170 and the high pressure switch 140 in turn, and then flow out from the pure water port 102 for drinking by the user, thereby effectively preventing purification The final water flows back in the water purification system 100, so that the quality of the effluent water can be guaranteed.

Specifically, the waste water valve 150 may be a combined valve that is a passage in a fully open state and a waste water proportional valve in a closed state. In other words, the waste water valve 150 may include a waste water proportional valve and a normally closed solenoid valve connected in parallel, the normally closed solenoid valve is opened in the fully open state, and the normally closed solenoid valve is closed in the closed state. Thus, the on-off of the water channel in the water purification system 100 can be better controlled, thereby ensuring the quality of the purified water.

When the composite filter element 110 needs to be flushed, the waste water valve 150 can be fully opened, the water inlet solenoid valve 130 and the booster pump 120 can both be in an open state, and the composite filter element 110 can be cleaned by flushing with a large amount of water. Under normal conditions, the waste water valve 150 is in a closed state, leaving only small holes for water to pass through. In this way, not only can the user's demand for flushing the composite filter element 110 be met, but also the quality of the effluent water can be guaranteed to a certain extent.

Referring to FIGS. 2 and 3 , the composite filter element 110 may include a housing 114 and a composite filter element body 115 .

Specifically, a water source inlet 111, a pure water outlet 112 and a concentrated water outlet 113 can be formed on the housing 114, and the composite filter element body 115 can be arranged in the housing 114, and the composite filter element body 115 includes a plurality of filter core layers, and a plurality of filter core layers It can include a pretreatment filter element 116 and a fine filter layer 117, the fine filter layer 117 can separate the water source inlet 111, the pure water outlet 112 and the concentrated water outlet 113, and the pretreatment filter element 116 can separate the water source inlet 111 and the fine filter layer 117. Thus, the miniaturization of the composite filter element 110 can be achieved while satisfying the user's requirements for water quality.

Wherein, the water flow boosted by the booster pump 120 enters the composite filter element 110, first enters the composite filter element body 115 from the water source inlet 111 formed on the casing 114, and then passes through the pretreatment filter element 116 and the fine filter layer 117 successively. Filter the water layer by layer, which can further ensure the quality of the effluent water. Finally, the pure water filtered by the fine filter layer 117 can flow out from the pure water outlet 112, and the waste water can flow out from the concentrated water outlet 113. Under the action of the waste water valve 150 The concentrated water is discharged through the outlet 103, so that the user's requirements for drinking water quality can be better met.

Further, referring to FIG. 4 and in conjunction with FIG. 3 , the composite filter element body 115 can also include an upper end cover 118 and a lower end cover 119 arranged at intervals along the up and down direction, the upper end cover 118 can be connected with the fine filter layer 117, and the lower end cover 119 can be connected with the pre-filtering layer 119. The treatment filter element 116 is connected, and the pretreatment filter element 116 and the fine filter layer 117 can be nested in sequence from outside to inside.

For example, in the example of FIG. 4 , the upper end cover 118 may be provided with a hook 108 , and the fine filter layer 117 may be provided with a slot 109 adapted to the hook 108 , and through the hook 108 and the slot 109 The combination can realize the cooperation between the upper end cover 118 and the fine filter layer 117, and the connection is reliable and easy to disassemble. It flows through the pretreatment filter element 116 for primary filtration, and then further filters through the fine filter layer 117, thereby ensuring the quality of the effluent water and better meeting the needs of users.

In addition, the composite filter element body 115 may further include a central rod 124 and a plurality of sealing elements, and the plurality of sealing elements may include a sealing ring 121 , a sealing cup 122 and a sealing gasket 123 . The combined use of multiple seals can ensure good sealing performance of the composite filter body 115, and can effectively reduce the residual water in the composite filter body 115, thereby ensuring the quality of effluent water.

2 and 3, the upper end of the housing 114 is open and the lower end is closed, the upper end of the housing 114 can be provided with a gland 104 for positioning the composite filter body 115, and the gland 104 is detachably connected to the housing 114 for positioning Composite filter element body 115 . When the composite filter element 110 works normally, the gland 104 can compress the composite filter element body 115, thereby effectively preventing impurities such as dust from entering and ensuring the quality of purified water.

Further, as shown in FIG. 3 , the composite filter element body 115 may further include a handle 105 . The handle 105 is rotatably arranged on the composite filter element body 115. When the composite filter element body 115 works normally, the handle 105 can be rotated to a state where it fits with the upper end cover 118; Rotate to a state perpendicular to the upper end cover 118, thereby facilitating the removal of the composite filter element body 115 from the housing 114, easy replacement and a small number of joints, which can effectively reduce the risk of water leakage.

Referring to FIG. 3 , the plurality of cartridge layers may also include a pleated PP layer 106 that may be disposed between the water inlet 111 and the pretreatment cartridge 116 . The folded PP layer 106 in the direction of water flow can be arranged before the pretreatment filter element 116 . The folded PP layer 106 has a large membrane filtration area and strong dirt-holding capacity, and can retain impurities and dirt in the water, thereby protecting the pretreatment filter element 116 and the fine filter layer 117 to a certain extent.

Here, it should be noted that the folded PP layer 106 can be a separately selected and replaced part to be used as a spare part, and can be selectively installed according to the water quality, and the specific parameters of the folded PP layer 106 can also be adjusted according to different water qualities. adaptive selection.

Preferably, the pretreatment filter element 116 can be sleeved on the outer periphery of the fine filter layer 117 , and the folded PP layer 106 is sleeved on the outer periphery of the pretreatment filter element 116 . That is to say, the folded PP layer 106, the pretreatment filter element 116 and the fine filter layer 117 are nested from outside to inside, the folded PP layer 106 is on the outside, the fine filter layer 117 is on the inside, and the water flow direction is from outside to inside. Thus, the filtration accuracy of multiple filter core layers is refined layer by layer from the outside to the inside, and the outer filter core layer, such as the folded PP layer 106, can have a larger surface area and dirt-holding capacity, thereby effectively preventing the pretreatment filter core 116 from clogging, better To ensure the filtering effect.

As shown in FIG. 4 , the pretreatment filter element 116 may include a PP non-woven fabric winding layer 126 and an activated carbon fiber winding layer 127 sequentially stacked along the water flow direction. Wherein, the PP non-woven fabric winding layer 126 can be wound outside the activated carbon fiber winding layer 127 . The fine filter layer 117 may be a reverse osmosis membrane (ie RO membrane, ReverseOsmosis membrane), an ultrafiltration membrane (ie UF membrane, ultrafiltration membrane) or a nanofiltration membrane (ie NF membrane, nanofiltration membrane).

Among them, the reverse osmosis membrane is a membrane separation and filtration technology that uses the osmotic pressure difference as the driving force. Ultrafiltration membrane is a pressure-driven membrane separation process that uses the interception capacity of porous materials to separate particulate matter from fluid and dissolved components. The typical pore size of the ultrafiltration membrane is between 0.01-0.1 microns, and it has a very high removal rate for bacteria and most viruses, colloids, sludge, etc. Nanofiltration membrane is a pressure-driven membrane separation process between reverse osmosis and ultrafiltration. The pore size of nanofiltration membrane is in the range of several nanometers. The utility model does not limit the specific form of the fine filter layer 117, and it can be adaptively selected according to needs during practical application.

The filtration accuracy of the PP non-woven winding layer 126 can be set to 5 μm, and the filtration accuracy of the folded PP layer 106 can be set to be greater than that of the PP non-woven winding layer 126 to ensure the filtering effect. In addition, the thickness of multiple filter element layers can be set according to different regions and different water quality, so as to better meet the needs of users for water purification.

The working process of the water purification system 100 according to the embodiment of the present utility model will be described in detail below with reference to FIGS. 1 to 4 .

Specifically, when the user turns on the water tap, the high-pressure switch 140 is pressure-relieved and closed, and the high-voltage switch 140 can send a signal to the electric control board, and the electric control board can start the booster pump 120 while opening the water inlet solenoid valve 130. At this time, The water purification system 100 starts to deliver water from the water inlet 101 to the composite filter element 110 to prepare pure water.

Wherein, the water flow pressurized by the booster pump 120 enters the composite filter element 110, first passes through the folded PP layer 106, and then enters the pretreatment filter element 116. Due to the sealing of the sealing cup 122, the water passing through the pretreatment filter element 116 Can only flow through the fine filter layer 117 from top to bottom, the pure water filtered by the fine filter layer 117 flows out from the pure water outlet 112 of the composite filter element 110 through the central rod 124, and the concentrated water flows out from the concentrated water outlet 113 of the composite filter element 110. Thus, the user's requirements for drinking water quality can be better met.

When the user closes the water tap, the high-pressure switch 140 is disconnected under pressure, and the high-voltage switch 140 can send a signal to the electric control board, and the electric control board will close the water inlet solenoid valve 130 and the booster pump 120. At this time, the water purification system 100 will stop. The water is delivered into the composite filter element 110 to stop the preparation of pure water.

When the composite filter element 110 needs to be flushed, the waste water valve 150 can be fully opened, the water inlet solenoid valve 130 and the booster pump 120 can both be in an open state, and the composite filter element 110 can be cleaned by flushing with a large amount of water. Under normal conditions, the waste water valve 150 is in a closed state, leaving only small holes for water to pass through. In this way, not only can the user's demand for flushing the composite filter element 110 be met, but also the quality of the effluent water can be guaranteed to a certain extent. So far, the working process of the water purification system 100 according to the embodiment of the present utility model is completed.

In addition, the above-mentioned water purification system 100 can also add TDS (Total dissolved solids, also known as total dissolved solids, the measurement unit is mg/L, which indicates how many milligrams of dissolved solids are dissolved in 1 liter of water) detection module or WIFI module, so that real-time detection and intelligent operation can be realized.

In addition, the water purification system 100 can also add a water leakage detection module to achieve water leakage protection, so as to better meet the diverse needs of users and improve the market share and market competitiveness of the water purification system.

In describing the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "Back", "Left", "Right", "Vertical", "Horizontal", "Top", "Bottom", "Inner", "Outer", "Clockwise", "Counterclockwise", "Axial" The orientation or positional relationship indicated by , "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, rather than indicating or implying the referred device Or elements must have a specific orientation, be constructed and operate in a specific orientation, and thus should not be construed as limiting the invention.

In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be interpreted as indicating or implying relative importance or implicitly specifying the quantity of indicated technical features. Thus, the features defined as "first" and "second" may explicitly or implicitly include at least one of these features. In the description of the present utility model, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

In this utility model, unless otherwise specified and limited, terms such as "installation", "connection", "connection" and "fixation" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection. Connected, or integrated; may be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediary, and may be an internal communication between two elements or an interactive relationship between two elements, unless otherwise stated Clearly defined. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present utility model according to specific situations.

In the present invention, unless otherwise clearly specified and limited, the first feature may be in direct contact with the first feature or the first feature and the second feature through an intermediary indirect contact. Moreover, "above", "above" and "above" the first feature on the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. "Below", "beneath" and "beneath" the first feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is less horizontally than the second feature.

In the description of this specification, descriptions with reference to the terms "one embodiment", "some embodiments", "example", "specific examples", or "some examples" mean that specific features described in connection with the embodiment or example , structures, materials or features are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the described specific features, structures, materials or characteristics may be combined in any suitable manner in any one or more embodiments or examples. In addition, those skilled in the art can combine and combine different embodiments or examples and features of different embodiments or examples described in this specification without conflicting with each other.

Although the embodiments of the present invention have been shown and described above, it can be understood that the above-mentioned embodiments are exemplary, and should not be construed as limitations of the present invention, and those of ordinary skill in the art are within the scope of the present invention. Variations, modifications, substitutions and variations can be made to the above-described embodiments.

Claims (10)

1. A water purification system, characterized in that, comprising: A composite filter element, the composite filter element has a water source inlet, a pure water outlet and a concentrated water outlet; A booster pump, the booster pump is connected to the water source inlet of the composite filter element; A water inlet solenoid valve, the water inlet solenoid valve is connected in series with the booster pump; A high-pressure switch, the high-pressure switch is connected to the pure water outlet of the composite filter element, the high-pressure switch is respectively connected to the booster pump and the water inlet solenoid valve, and the high-pressure switch controls the booster pump according to the outlet water pressure pump and the water inlet solenoid valve; A waste water valve, the waste water valve is connected with the concentrated water outlet of the composite filter element. 2. The water purification system according to claim 1, wherein the water purification system further comprises a pre-filter, and the pre-filter is connected in series between the water inlet solenoid valve and the booster pump upstream. 3. The water purification system according to claim 1, characterized in that, the pure water outlet of the composite filter element is connected with a one-way valve connected in series with the high pressure switch. 4 . The water purification system according to claim 1 , wherein the waste water valve is a combination valve that is a passage in a fully open state and a waste water proportional valve in a closed state. 5. The water purification system according to any one of claims 1-4, wherein the composite filter element comprises: A housing, on which the water source inlet, the pure water outlet and the concentrated water outlet are formed; A composite filter element body, the composite filter element body is arranged in the housing, the composite filter element body includes a plurality of filter element layers, the plurality of filter element layers include a pretreatment filter element and a fine filter layer, and the fine filter layers are spaced apart The water source inlet, the pure water outlet and the concentrated water outlet, the pretreatment filter element separates the water source inlet and the fine filter layer. 6. The water purification system according to claim 5, wherein the composite filter element body also includes an upper end cover and a lower end cover arranged at intervals along the up and down direction, and the upper end cover is connected with the fine filter layer, so that The lower end cover is connected with the pretreatment filter element, and the pretreatment filter element and the fine filter layer are nested in sequence from outside to inside. 7. The water purification system according to claim 5, wherein the upper end of the housing is open and the lower end is closed, the upper end of the housing is provided with a gland for positioning the composite filter element body, the gland is The cover is detachably connected with the housing for positioning the composite filter element body. 8. The water purification system according to claim 7, wherein the composite filter body further comprises a handle. 9 . The water purification system according to claim 5 , wherein the plurality of filter core layers further comprise a folded PP layer, and the folded PP layer is arranged between the water source inlet and the pretreatment filter core. 10 . 10. The water purification system according to claim 5, wherein the pretreatment filter element comprises a PP non-woven fabric wrapping layer and an activated carbon fiber wrapping layer arranged sequentially along the water flow direction, and the fine filter layer is Reverse osmosis, ultrafiltration or nanofiltration membranes.