CN210313579U - Leading filter core that filters - Google Patents

Abstract

The utility model provides a front-mounted filter element, which comprises a shell, wherein the shell is provided with a water inlet and a water purifying port; leading filter core still includes filter screen subassembly, first filter core and the center tube shunt of setting in the casing, and the center tube shunt includes center tube and the shunt of setting in center tube one end, and the periphery of shunt is located to the filter screen subassembly cover, and first filter core cover is established in the periphery of center tube, is formed with central passage in the center tube, and the shunt has the inhalant canal of intercommunication central passage, and the filter screen subassembly sets up on the intercommunication route between water inlet and inhalant canal. The utility model discloses be in water treatment technical field, set up leading filter screen subassembly through the filtration front end at first filter core, carry out primary filter to rivers, can improve the life of first filter core like this, and then improve the life of whole leading filtration filter core, reduce the frequency of changing leading filtration filter core, reduce the cost of water purification.

Description

Leading filter core that filters

Technical Field

The utility model relates to a water treatment technical field, in particular to leading filter core that filters.

Background

In recent years, water purifiers are exploded in the water purification market and become the most potential products in the field of household appliances. Meanwhile, the updating pace of products is accelerated, the industry technology is continuously improved, and as the filter element on the water purifier belongs to consumables and needs to be replaced after being used for a period of time, the service life of the filter element and the cost of replacing the filter element become the common pain point of consumers and manufacturers. Along with the arrival of big flux water purifier era, composite filter element, long-term filter core come into effect, but do not fundamentally solve the pain point, just accomplish traditional two to tertiary filter core together simply, the volume increases, can't wash, large granule impurity and dirt incrustation scale remain on the filter core surface, perhaps for the water purifier front end increases a leading filter (being the filter of stainless steel net), can only user's manual going washes during washing, perhaps increases the stainless steel filter screen on inside filter core surface whole, with high costs, the processing degree of difficulty is big.

SUMMERY OF THE UTILITY MODEL

In order to solve at least one of the technical problems, the utility model provides a leading filter core, its built-in leading filter screen subassembly has promoted the life-span of filter core, has reduced the cost of water purification.

In order to achieve the purpose of the utility model, the utility model discloses the technical scheme who takes as follows:

a pre-filter cartridge comprising a housing having a water inlet and a water clean-out; leading filter core is still including setting up filter screen subassembly, first filter core and center tube shunt in the casing, the center tube shunt includes the center tube and sets up the shunt of center tube one end, the filter screen subassembly cover is located the periphery of shunt, first filter core cover is established the periphery of center tube, be formed with central passage in the center tube, the shunt has the intercommunication central passage's inhalant canal, the filter screen subassembly sets up the water inlet with on the intercommunication route between the inhalant canal.

Optionally, a clean water chamber and an inlet water chamber surrounding the outside of the clean water chamber are formed in the housing, and the strainer assembly is provided on a communication passage between the inlet water chamber and the inlet water passage.

Optionally, the casing is including the installation the barrel and the lid of center tube fit end cover on the barrel, be equipped with first annular muscle on the end cover, the one end of shunt with first annular muscle cooperation forms the water purification chamber, the periphery of first annular muscle forms the intake antrum, the intake antrum is located the filtration front end of filter screen subassembly, inhalant canal is located the filtration rear end of filter screen subassembly.

Optionally, the filter screen subassembly includes the filter screen base and sets up annular filter screen on the filter screen base, the end cover still be equipped with surround in the second annular muscle of the periphery of first annular muscle, annular filter screen keeps away from the one end of filter screen base is supported on the second annular muscle and sealed cooperation, filter screen base edge all around is supported on the inner peripheral surface of barrel and sealed cooperation.

Optionally, the screen base includes an end wall and an annular side wall connected to an edge of the end wall, and the flow diverter includes an end seal located within the annular side wall, the end seal abutting the end wall and in sealing engagement with the annular side wall.

Optionally, a first filtering channel located at the filtering front end of the first filter element is formed between the first filter element and the housing, a second filtering channel located at the filtering rear end of the first filter element is formed between the first filter element and the central tube, the first filtering channel is communicated with the central channel, and the second filtering channel is communicated with the water purifying port.

Optionally, the housing has a flushing port and a flushing cavity in communication with the flushing port, the flushing cavity surrounds the outside of the screen assembly, and the intake cavity is in communication with the flushing cavity.

Optionally, the front filter element further includes a second filter element disposed in the housing, the flow divider includes a water outlet channel connected to the filter rear end of the first filter element, and the second filter element is disposed on a communication path between the water outlet channel and the water purifying port.

Optionally, the second filter element is a scale inhibiting filter element, the scale inhibiting filter element includes a first support, a second support and a scale inhibiting material, a cavity for accommodating the scale inhibiting material is formed between the first support and the second support, and the first support and the second support are respectively provided with a water inlet and a water outlet.

Optionally, the second filter element is mounted within the screen assembly and is axially connected to the center tube splitter, the second filter element having a diameter greater than the diameter of the center tube.

After the technical scheme is adopted, the utility model discloses following beneficial effect has:

1. in the leading filter core, be equipped with the filter screen subassembly on the intercommunication passageway between the water inlet of casing and the inhalant canal of center tube shunt, the rivers that get into from the water inlet need filter through the filter screen subassembly earlier before getting into the center tube shunt like this, and the water after the filter screen subassembly filters gets into the inhalant canal, the center passage back of center tube shunt again, and the first filter core of flow direction utilizes first filter core to carry out secondary filter to rivers, and the clean water after filtering at last flows from the water purification mouth of casing.

In the leading filter core that filters, set up leading filter screen subassembly at the filtration front end of first filter core, carry out elementary filtration to rivers, can improve the life of first filter core like this, and then improve the life of whole leading filter core, reduce the frequency of changing leading filter core, reduce the cost of water purification.

2. Be equipped with first annular muscle on the end cover of casing, the shunt forms the water purification chamber with the cooperation of first annular muscle, and the periphery of first annular muscle forms the intake antrum, and the filter screen subassembly sets up on the intercommunication route between intake antrum and inhalant canal, and the intake antrum is located the filtration front end of filter screen subassembly, and the inhalant canal is located the filtration rear end of filter screen subassembly. Water flow firstly flows into a water inlet cavity positioned at the filtering front end of the filter screen assembly after entering from the water inlet, then flows through the filter screen assembly, then flows into a water inlet channel positioned at the filtering rear end of the filter screen assembly, then sequentially flows through the central channel, the first filter element and the water purification cavity, and finally is discharged from the water purification port.

3. The filter screen subassembly includes filter screen base and annular filter screen, the end cover still is equipped with the second annular muscle that encircles in the periphery of first annular muscle, second annular muscle can form a chamber wall of intake antrum, annular filter screen and second annular muscle butt and sealed cooperation, and filter screen base edge all around and the inner peripheral surface butt of the barrel of casing and sealed cooperation, the annular filter screen can be flowed through completely to the water of intake antrum like this, and can not follow and pass through between annular filter screen and the second annular muscle, also can not follow and pass through between the inner peripheral surface of filter screen base and barrel, make the filter screen subassembly can filter the rivers that get into are whole, the filter effect has been ensured.

4. The filter screen base includes end wall and annular side wall, and the end seal of shunt is located the annular side wall of filter screen base, and with the end wall butt of filter screen base, and usable center tube shunt supports the location to the filter screen subassembly like this.

5. The casing has and washes the mouth and wash the chamber, wherein washes the outside that the chamber encircles the filter screen subassembly, and the intake antrum with wash the chamber intercommunication for leading filter core can wash the filter screen subassembly. When the washing device is used for washing, water flows into the water inlet cavity from the water inlet, the filter screen assembly in the water inlet cavity is washed, and washing water after washing enters the washing cavity and flows out from the washing port.

The front-mounted filter element can automatically wash the filter screen assembly, the service life of the filter screen assembly is prolonged, the service life of the whole front-mounted filter element is prolonged, and the replacement frequency and the replacement cost of the front-mounted filter element are reduced.

6. The preposed filter element also comprises a second filter element, the scale inhibition filter element can be a scale inhibition filter element, the second filter element is arranged on a communication passage between the water outlet channel of the flow divider and the water purifying port of the shell, and after the filter screen assembly and the first filter element are utilized to filter, the second filter element can be utilized to further filter the water flow before the water flow flows out of the water purifying port, so that the filtering and purifying effect of the preposed filter element is improved. In addition, contain filter screen subassembly, first filter core and second filter core in the leading filter core, the integrated level is high.

Other features and advantages of the present invention will be set forth in the description that follows.

Drawings

The accompanying drawings are included to provide a further understanding of the technical solutions of the present invention, and are incorporated in and constitute a part of this specification, together with the embodiments of the present invention for explaining the technical solutions of the present invention, and do not constitute a limitation on the technical solutions of the present invention.

Fig. 1 is an exploded schematic view of a front filter cartridge according to an embodiment of the present invention;

FIG. 2 is a schematic cross-sectional view of the pre-filter cartridge of FIG. 1;

FIG. 3 is an enlarged schematic view of the upper portion of FIG. 2;

FIG. 4 is a cross-sectional schematic view of an assembled configuration of a screen assembly, a center tube splitter and a first filter cartridge of the pre-filter cartridge of FIG. 1;

FIG. 5 is a schematic view of a center tube flow diverter of the pre-filter cartridge of FIG. 1;

FIG. 6 is a cross-sectional structural schematic view of the base pipe splitter shown in FIG. 5;

FIG. 7 is a schematic view of a screen assembly of the pre-filter cartridge of FIG. 1;

fig. 8 is a schematic view of the first frame of the second cartridge of the pre-filter cartridge of fig. 1;

FIG. 9 is another schematic structural view of the first bracket shown in FIG. 8;

fig. 10 is a schematic view of a second frame of a second cartridge of the pre-filter cartridge of fig. 1;

FIG. 11 is a schematic view of the end cap of the housing of the pre-filter cartridge of FIG. 1;

FIG. 12 is a longitudinal cross-sectional structural schematic view of the end cap shown in FIG. 11;

FIG. 13 is a cross-sectional structural schematic view of the end cap of FIG. 11.

Reference numerals:

1-housing, 11-cartridge, 111-first filter channel, 112-second filter channel, 12-end cap, 120-third annular rib, 121-second annular rib, 122-first annular rib, 123-water inlet, 124-water outlet, 125-flushing port, 126-water inlet chamber, 127-water outlet chamber, 128-flushing chamber, 129-communication hole, 2-filter screen assembly, 21-filter screen base, 211-end wall, 212-annular side wall, 22-annular filter screen, 3-first filter element, 4-central tube diverter, 41-central tube, 411-central channel, 42-diverter, 421-water inlet channel, 422-water outlet channel, 43-end seal, 5-second filter element, 51-first support, 511-a water outlet port, 512-a sealing groove, 513-a welding surface, 52-a second bracket, 521-a water inlet port, 522-a support rib, 523-a welding rib and 6-an inner base.

Detailed Description

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

As shown in fig. 1 to 4, the present embodiment provides a pre-filter cartridge, which includes a housing 1, wherein the housing 1 has a water inlet 123 and a water purifying outlet 124.

Further, leading filter core still includes the filter screen subassembly 2, first filter core 3 and the center tube shunt 4 of setting in casing 1, center tube shunt 4 includes center tube 41 and the shunt 42 of setting in center tube 41 one end, the periphery of shunt 42 is located to filter screen subassembly 2 cover, first filter core 3 cover is established in the periphery of center tube 41, be formed with central passageway 411 in the center tube 41, shunt 42 has the inhalant canal 421 of intercommunication central passageway 411, filter screen subassembly 2 sets up on the intercommunication route between water inlet 123 and inhalant canal 421.

A first filter passage 111 at the filter front end of the first filter element 3 is formed between the first filter element 3 and the housing 1, and the first filter passage 111 communicates with the center passage 411. A second filtering channel 112 is formed between the first filter element 3 and the central tube 41 and is positioned at the filtering rear end of the first filter element 3, and the second filtering channel 112 is communicated with a water purifying opening 124.

The flow diverter 42 further comprises a water outlet channel 422 connected to the filtered end of the first filter cartridge 3, the water outlet channel 422 communicating the second filter channel 112 with the clean water port 124. Alternatively, as shown in fig. 5 and 6, the water outlet passage 422 of the flow divider 42 is located at the outer periphery of the central passage 411, the water inlet passage 421 of the flow divider 42 is radially disposed, and both ends of the water inlet passage 421 penetrate the peripheral wall of the flow divider 42 and the peripheral wall of the central pipe 41, respectively.

When the water purification of the front-mounted filter element is utilized, water enters the shell 1 from the water inlet 123, the water flow entering from the water inlet 123 needs to be filtered by the filter screen assembly 2 before entering the central tube flow divider 4, the water filtered by the filter screen assembly 2 enters the water inlet channel 421 and the central channel 411 of the central tube flow divider 4 again, then the water flows to the first filter element 3 through the first filter channel 111, the water flow is filtered again by the first filter element 3, and the finally filtered purified water flows out from the water purification port 124 of the shell 1 through the second filter channel 112 and the water outlet channel 422.

Through the filter screen subassembly 2 that sets up leading at the filtration front end of first filter core 3, carry out primary filter to rivers, can improve the life of first filter core 3 and whole leading filter core like this, reduce the frequency of changing leading filter core, reduce the cost of water purification.

Alternatively, as shown in fig. 3, a purified water chamber 127 and an inlet chamber 126 surrounding the outside of the purified water chamber 127 are formed in the housing 1, and the screen assembly 2 is provided on a communication path between the inlet chamber 126 and the inlet passage 421.

As shown in fig. 1, the housing 1 includes a cylinder 11 with a central tube 41 mounted thereon and an end cap 12 covering the cylinder 11, wherein the water inlet 123 and the water purifying opening 124 are both disposed on the end cap 12. As shown in fig. 3, 11-13, the end cap 12 is further provided with a first annular rib 122, and one end of the flow diverter 42 cooperates with the first annular rib 122 to form a clean water chamber 127. The periphery of the first annular rib 122 forms a water inlet chamber 126, the water inlet chamber 126 is located at the filtering front end of the filter screen assembly 2, and the water inlet passage 421 is located at the filtering rear end of the filter screen assembly 2.

After entering from the water inlet 123, the water flows into the water inlet cavity 126 at the front end of the filter screen assembly 2, then flows through the filter screen assembly 2, flows into the water inlet channel 421 at the rear end of the filter screen assembly 2, then flows through the central channel 411, the first filter channel 111, the first filter element 3, the second filter channel 112 and the purified water cavity 127 in sequence, and finally is discharged from the purified water outlet 124.

Alternatively, as shown in fig. 7, the screen assembly 2 includes a screen base 21 and an annular screen 22 provided on the screen base 21; as shown in fig. 11-13, the end cap 12 is further provided with a second annular rib 121 surrounding the outer periphery of the first annular rib 122; as shown in fig. 3, one end of the annular filter screen 22 away from the filter screen base 21 abuts against the second annular rib 121 and is in sealing fit, and the peripheral edge of the filter screen base 21 abuts against the inner peripheral surface of the cylinder 11 and is in sealing fit.

Second annular muscle 121 that surrounds in the periphery of first annular muscle 122 on end cover 12 can form a chamber wall of intake antrum 126, the upper end and the second annular muscle 121 butt of the annular filter screen 22 of filter screen subassembly 2 and sealed cooperation, and filter screen base 21 of filter screen subassembly 2 lower extreme edge all around and the inner peripheral surface butt of the barrel 11 of casing 1 and sealed cooperation, the water of intake antrum 126 can flow through annular filter screen 22 completely like this, and can not pass through between annular filter screen 22 and the second annular muscle 121, also can not pass through between the inner peripheral surface of filter screen base 21 and barrel 11, make filter screen subassembly 2 can filter the rivers that get into are whole, the filter effect has been ensured.

In addition, the peripheral edge of the strainer base 21 abuts against the inner peripheral surface of the cylindrical body 11 and is in sealing engagement, so that the strainer front end of the strainer assembly 2 is separated from the first filtering passage 111, and water mixing is prevented.

Alternatively, as shown in fig. 3 and 7, the screen base 21 includes an end wall 211 and an annular side wall 212 connected to an edge of the end wall 211, and an outer peripheral surface of the annular side wall 212 abuts and is in sealing engagement with an inner peripheral surface of the cylinder 11.

Optionally, as shown in fig. 3, 11 and 12, the end cap 12 is further provided with a third annular rib 120 surrounding the outer periphery of the second annular rib 121, and an inlet chamber 126 is formed between the second annular rib 121 and the third annular rib 120. The height of the third annular rib 120 can be higher than that of the second annular rib 121, so that the lower end of the third annular rib 120 can abut against the end wall 211 of the filter screen base 21, and the lower end of the second annular rib 121 can abut against and be in sealing fit with the upper end of the annular filter screen 22.

Optionally, the annular filter screen 22 is a stainless steel filter screen. The stainless steel filter screen has high structural strength, long service life and convenient cleaning. The annular filter screen 22 and the filter screen base 21 may be an integrated structure or a split structure. When the annular filter screen 22 and the filter screen base 21 are of a split structure, the annular filter screen 22 can be sleeved on the filter screen base 21 from above, and the lower end of the annular filter screen 22 is abutted to the end wall 211 of the filter screen base 21.

Alternatively, as shown in fig. 3-6, the flow diverter 42 includes an end seal 43, the end seal 43 being located within the annular sidewall 212 of the screen base 21, the end seal 43 abutting the end wall 211 of the screen base 21 and being in sealing engagement with the annular sidewall 212.

The end seal 43 of the flow diverter 42 is positioned within the annular side wall 212 of the screen base 21 and abuts the end wall 211 of the screen base 21 so that the screen assembly 2 can be supported in place by the center tube flow diverter 4. The end seal 43 sealingly engages the annular sidewall 212 of the screen base 21 to separate the first filter passage 111 from the filtered rear end of the screen assembly 2 to prevent mixing.

Optionally, as shown in fig. 3 and 11-13, the housing 1 further has a flushing port 125 and a flushing chamber 128 in communication with the flushing port 125, the flushing chamber 128 being surrounded on the outside of the screen assembly 2, and the inlet chamber 126 and the flushing chamber 128 being in communication.

A pre-filter cartridge having a flushing port 125 and a flushing chamber 128 allows flushing of the screen assembly 2. During flushing, water flows from the water inlet 123 into the water inlet chamber 126 to flush the screen assembly 2, and the flushed water enters the flushing chamber 128 and flows out of the flushing port 125.

The front-mounted filter element can automatically wash the filter screen assembly 2, the service life of the filter screen assembly 2 is prolonged, the service life of the whole front-mounted filter element is prolonged, and the replacement frequency and the replacement cost of the front-mounted filter element are reduced.

As shown in fig. 11-13, the flush port 125 and the flush chamber 128 may be formed on the end cap 12 of the housing 1. Wherein, a flushing cavity 128 is formed between the third annular rib 120 and the side wall of the end cover 12, and a communication hole 129 is arranged on the third annular rib 120 and is used for communicating the water inlet cavity 126 and the flushing cavity 128. The communication hole 129 may be provided at the lower end of the third annular rib 120, or may be provided at another position of the third annular rib 120.

Optionally, as shown in fig. 1-4, the pre-filter cartridge further includes a second cartridge 5 disposed in the housing 1, the second cartridge 5 being disposed on a communication path between the water outlet channel 422 of the flow divider 42 and the clean water port 124.

After utilizing filter screen subassembly 2, first filter core 3 to filter, still can utilize second filter core 5 to further filter rivers before rivers flow out water purification mouth 124, improved leading filtration filter core's filtration purifying effect. In addition, the preposed filtering filter element comprises a filter screen component 2, a first filter element 3 and a second filter element 5, and the integration level is high.

Optionally, as shown in fig. 3 and 4, the second filter element 5 is a scale inhibiting filter element, the scale inhibiting filter element includes a first support 51, a second support 52 and a scale inhibiting material, a chamber for accommodating the scale inhibiting material is formed between the first support 51 and the second support 52, and the first support 51 and the second support 52 are respectively provided with a water inlet 521 and a water outlet 511.

As shown in fig. 3 and 4, the first bracket 51 is located above and the second bracket 52 is located below. The first bracket 51 is provided with an upwardly protruding water outlet 511, and the water outlet 511 is inserted into and hermetically fitted with the first annular rib 122 forming the purified water cavity 127. As shown in fig. 8, a seal groove 512 for attaching a seal ring is provided on the outer peripheral surface of the water outlet port 511.

As shown in fig. 10, the second bracket 52 is provided with support ribs 522, and gaps between the support ribs 522 form water inlet ports 521. As shown in fig. 3 and 4, the lower end of the second bracket 52 fits over the flow diverter 42 and is in sealing engagement with the flow diverter 42. The inlet port 521 on the second bracket 52 communicates with the outlet passage 422 on the diverter 42.

The first and second brackets 51 and 52 are provided with nonwoven fabrics covering the water inlet port 521 and the water outlet port 511, respectively. As shown in fig. 9, the first holder 51 is provided with a welding surface 513, and the welding surface 513 of the first holder 51 is welded with a non-woven fabric. As shown in fig. 10, the support ribs 522 of the second frame 52 are used for supporting and welding the non-woven fabric.

Alternatively, the first bracket 51 and the second bracket 52 are hermetically connected by welding. As shown in fig. 9 and 10, the second bracket 52 is provided with a welding rib 523, and the welding rib 523 and the edge of the welding surface 513 are ultrasonically welded to realize the sealing connection between the first bracket 51 and the second bracket 52.

Optionally, the ratio of the diameter to the height of the second filter element 5 (i.e. the ratio of the diameter of the second filter element 5 to its height) is 1: 1-8: 1, the second filter element 5 is flat and is arranged in the end cover 12, so that the space can be saved.

Alternatively, as shown in fig. 3 and 4, the second filter element 5 is installed in the screen assembly 2, and the second filter element 5 is axially connected to the central pipe flow divider 4, and the diameter of the second filter element 5 is larger than that of the central pipe 41, so that the water inlet port 521 of the second filter element 5 is communicated with the water outlet passage 422 located at the outer periphery of the central pipe 41.

Optionally, the first filter element 3 is a cotton-carbon composite filter element or a carbon fiber filter element. When the first filter element 3 is a cotton-carbon composite filter element, a front filter element comprising the filter screen component 2, the cotton-carbon composite filter element and the second filter element 5 can form a four-in-one filter element; when first filter core 3 was the carbon fiber filter core, contained filter screen subassembly 2, carbon fiber filter core and the leading filter core of filtering of second filter core 5 and can form trinity filter core.

Optionally, the lower end of the first filter element 3 is provided with an inner base 6 for supporting the first filter element 3.

The working principle of the pre-filter cartridge of the present embodiment will be described in detail below with reference to the accompanying drawings.

The front-mounted filter element is provided with three ports: the water inlet 123, the clean water port 124 and the flushing port 125, and a ball valve is arranged at the flushing port 125 and is in a normally closed state.

The process of purifying water is as follows: water enters the water inlet cavity 126 from the water inlet 123, is filtered by the filter screen assembly 2, then reaches the central channel 411 of the central pipe 41 through the water inlet channel 421 of the flow divider 42, flows to the first filtering channel 111 from the bottom of the central pipe 41, then reaches the second filtering channel 112 after being filtered by the first filter element 3, then reaches the scale inhibition filter element through the water outlet channel 422 of the flow divider 42, and finally flows out from the water purifying port 124 after passing through the water purifying cavity 127. The arrows in fig. 2 indicate the direction of flow of water during the purification of water.

The process of washing the screen assembly 2 is: when the user stops using water, the normally closed ball valve connected to the flushing port 125 is opened to flush the pre-strainer. In the washing operation, water enters the water inlet chamber 126 through the water inlet 123, and then the filter screen assembly 2 is washed, and the washed water enters the washing chamber 128 through the communication hole 129 and finally is discharged from the washing port 125.

The front-mounted filter element of the embodiment has the following beneficial effects:

1. the preposed filter element is a three-in-one filter element or a four-in-one filter element, the integration level is high, and the filtering effect is good;

2. the service life of the preposed filter element is prolonged by the built-in preposed filter screen component;

3. the automatic flushing function of the filter screen assembly is realized, and the service life of the preposed filter element is prolonged;

4. the built-in dirt filter core that hinders has promoted the filtration purification effect.

The above-mentioned embodiments only express the exemplary embodiments of the present invention, and the description thereof is specific and detailed, but the contents described are only the embodiments adopted for the convenience of understanding the present invention, and are not used to limit the present invention. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims (10)

1. A pre-filter cartridge comprising a housing having a water inlet and a water clean-out; its characterized in that, leading filter core is still including setting up filter screen subassembly, first filter core and center tube shunt in the casing, the center tube shunt includes the center tube and sets up the shunt of center tube one end, the filter screen subassembly cover is located the periphery of shunt, first filter core cover is established the periphery of center tube, be formed with central passageway in the center tube, the shunt has the intercommunication the inhalant canal of central passageway, the filter screen subassembly sets up the water inlet with on the intercommunication route between the inhalant canal.

2. The pre-filter cartridge of claim 1, wherein a clean water chamber and an inlet chamber surrounding the outside of the clean water chamber are formed in the housing, and the screen assembly is provided in a communication passage between the inlet chamber and the inlet passage.

3. The prefilter cartridge according to claim 2 wherein said housing includes a body for mounting said center tube and an end cap covering said body, said end cap having a first annular rib thereon, one end of said diverter cooperating with said first annular rib to form said clear water chamber, said first annular rib having a periphery defining said inlet chamber, said inlet chamber being located at said filter front end of said screen assembly, said inlet passage being located at said filter rear end of said screen assembly.

4. The prefilter cartridge of claim 3 wherein said filter screen assembly includes a filter screen base and an annular filter screen disposed on said filter screen base, said end cap further having a second annular rib surrounding the outer periphery of said first annular rib, the end of said annular filter screen remote from said filter screen base abutting said second annular rib and sealingly engaging, said filter screen base having a peripheral edge abutting the inner peripheral surface of said cartridge body and sealingly engaging.

5. The pre-filter cartridge of claim 4, wherein the screen base includes an end wall and an annular side wall connected to an edge of the end wall, and wherein the flow splitter includes an end seal positioned within the annular side wall, the end seal abutting the end wall and in sealing engagement with the annular side wall.

6. The pre-filter cartridge of claim 1, wherein the first cartridge defines a first filter passage between the housing and the first cartridge at a filter front end of the first cartridge, and wherein the first cartridge defines a second filter passage between the housing and the center tube at a filter rear end of the first cartridge, the first filter passage communicating with the center passage, and the second filter passage communicating with the clean water port.

7. The pre-filter cartridge of claim 3, wherein the housing has a flush port and a flush chamber in communication with the flush port, the flush chamber surrounding the outside of the screen assembly, and the inlet chamber in communication with the flush chamber.

8. The pre-filter cartridge according to any one of claims 1-7 further comprising a second cartridge disposed within the housing, the flow diverter including a water outlet passage connected to the filtered rear end of the first cartridge, the second cartridge disposed on a communication path between the water outlet passage and the clean water port.

9. The pre-filter cartridge of claim 8, wherein the second cartridge is a scale inhibiting cartridge, the scale inhibiting cartridge comprises a first bracket, a second bracket and a scale inhibiting material, a chamber for accommodating the scale inhibiting material is formed between the first bracket and the second bracket, and the first bracket and the second bracket are respectively provided with a water inlet and a water outlet.

10. The prefilter cartridge of claim 8 wherein said second cartridge is mounted within said screen assembly and said second cartridge is axially connected to said center tube splitter, said second cartridge having a diameter greater than the diameter of said center tube.

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