A bypassable multifunctional pre-filter

Abstract

A bypassable multifunctional pre-filter comprises a shell, one end of which is connected to a valve body, and the other end is connected to a sewage valve; the valve body is provided with two connecting ends, a valve core is built into the valve cavity, a valve cover is connected to the valve body, a through hole is provided in the middle of the valve cover, and a hand wheel is connected to the end of the rotating shaft portion after passing through the valve cover, and the hand wheel and the valve core form a synchronously rotating whole; a filter element is built into the shell, one end is open, and the other end is a closed end, and the open end cooperates with the positioning portion, and the filter element divides the inner cavity of the shell into two parts, an inner part and an outer part. The pre-filter of the present invention adopts a multifunctional valve core, and the hand wheel drives the valve core to rotate to select the corresponding function corresponding to the different function identification scales, and integrates the bypass function, the closing function, the cleaning function, and the filtering function, eliminating the need to install a switch valve at the front and rear ends of the pipeline, and at the same time, the outer frame can be controlled to rotate outside the filter to clear the sewage discharge passage.

Description

Technical Field

[0001] The present invention relates to the technical field of water purification systems, and in particular to a bypassable multifunctional pre-filter for meeting the usage requirements of users in different scenarios. Background Art

[0002] The pre-filter is used at the front end of household pipes, and can also be independently installed at the front end of water purifiers, dishwashers, water heaters, boilers, washing machines, floor heating, radiators, central air conditioners, etc.

[0003] Water is supplied through pipes. When water flows in the pipes, some pipe impurities will naturally be produced. Especially in urban water supply pipes, which are old and long, after long-term use, the rust, silt and other impurities in the pipes will not only cause brown water and water-using equipment control failure, heat exchanger pipe blockage and rupture, but also impurities will settle on the pipes, which provides a breeding ground for bacteria on the one hand, and forms electrochemical substances on the other hand, which can cause corrosion or perforation of metal pipes in just a few months.

[0004] Scale is the most important factor that damages equipment. As a killer of water pipes and containers, scale is mainly composed of calcium and magnesium. Water heaters, water boilers and other electrical appliances that need to heat water have particularly serious scale. The pre-filter can prevent the combination of calcium and magnesium ions and carbonate ions, play a role in preventing scale from forming, and can form a nano-level protective film on the inner wall of the water tank to repair the rust on the inner wall of the pipe and container. The filtration accuracy of the pre-filter is 5-100 microns, which can filter impurities visible to the naked eye, such as sand, rust, floating objects and other impurities, greatly extending the service life of subsequent equipment, such as faucets, showers, washing machines, water heaters, toilets, etc.

[0005] The current pre-filter has a single function, with only a one-way water inlet and a water removal end. It is installed in the system to filter and intercept impurities in the fluid. However, the filter needs to be isolated from the system to clean the filter. The current method is to set stop valves at both ends of the filter inlet and outlet to close the filter inlet and outlet respectively. However, the inlet and outlet are equipped with stop valves, and the filter is generally equipped with a sewage valve for sewage discharge, which makes the overall structure of the filter complex and the cost high. At the same time, the current cleaning of the filter requires blocking the fluid passage, so the filter needs to be cleaned when the system is in a stopped state, which does not conform to the actual situation.

[0006] Therefore, the present invention provides a multifunctional pre-filter with a built-in rotatable multi-way valve core, which can change the on-off and flow path of the fluid in the filter by rotating the valve core, thereby realizing the switching of the filter under different functions. Summary of the invention

[0007] According to the problem raised in the background technology, the present invention provides a bypassable multifunctional pre-filter to solve the problem, and the present invention will be further explained below.

[0008] A bypassable multifunctional pre-filter comprises a shell, one end of which is connected to a valve body, and the other end of which is connected to a drain valve;

[0009] The valve body is provided with two connecting ends, and a valve core is built in the valve cavity. The valve core includes a barrel wall portion matched with the inner wall of the valve cavity, and a communicating bypass port and a water outlet are arranged on the side wall of the barrel wall portion. The inner space of the barrel wall portion is divided into two non-circulating spaces by the partition portion and the flow channel walls of the two bypass ports in the valve core. A cylindrical protruding positioning portion is provided on the partition portion, and a water return port connected to the water outlet is formed in the positioning portion; the side wall of the barrel wall portion is also provided with adjacent water inlet and cleaning port, and the water inlet, cleaning port and water return port are located on the same space side in the barrel wall portion; the valve core also includes a rotating shaft portion on a side different from the positioning portion;

[0010] The valve body is connected with a valve cover, the middle of which is provided with a through hole, the end of the rotating shaft passes through the valve cover and is connected with a hand wheel, the hand wheel and the valve core form a synchronously rotating whole;

[0011] A filter element is built into the shell, one end of which is open and the other end is closed. The open end cooperates with the positioning part, and the filter element divides the inner cavity of the shell into two parts, inner and outer parts.

[0012] Preferably, the shell is made of transparent material to intuitively display the enrichment of impurities.

[0013] Preferably, the filter element outer shell is provided with an outer frame, the bottom is provided with a protruding prism, and the side wall of the prism is provided with a flow port; the outer shell is provided with a support platform at the port, and the support platform is provided with a flow slot, and the outer frame is against the support platform. When cleaning and draining, the fluid flushes the impurities accumulated in the outer shell of the filter element into the prism through the flow slot and the flow port, and finally discharged by the drain valve.

[0014] Preferably, a connecting piece is provided at the end of the outer shell, one end of which cooperates with the prism of the outer frame, and the other end is connected to the sewage valve. The connecting piece has a section exposed outside the outer shell, and a synchronously rotating seat is sleeved on the section. The rotating seat, the connecting piece and the outer frame form a linked swivel. The outer frame is given a controllable degree of freedom to rotate, and the operator can force the outer frame to rotate to clear the blocked sewage channel.

[0015] Preferably, a plurality of rubber strips are arranged on the outer frame along the axial direction, and the arrangement of the rubber strips is intended to further intensify the formation of fluid turbulence, intensify the loosening effect of blocking impurities, and scrape off impurities attached to the filter element and the inner wall of the housing.

[0016] The present invention replaces the stop valve of the filter inlet and outlet with a controlled rotating valve core. The fluid path can be selected by rotating the valve core to meet four different functions: filtration under normal system operation, filter element removal under system fluid bypass, filter element removal under a partition system, and sewage discharge by closing the water outlet.

[0017] Filtration state: When the system is working normally, the control hand wheel rotates, the water inlet of the valve core is aligned with the water inlet joint, the water outlet is aligned with the water outlet joint, the bypass port and the cleaning port are misaligned with the joint, and the drain valve is closed. In this state, the fluid first enters the cavity between the filter element and the housing from the water inlet, then flows through the filter element into the filter element, and finally flows out of the filter from the return port and the water outlet. The impurities carried in the fluid are retained by the filter element outside the filter element inside the housing.

[0018] Bypass state: When the system is working normally, the control hand wheel rotates, the two bypass ports of the valve core are directly opposite to the water inlet and outlet joints, the water outlet, water inlet, cleaning port and joints are misaligned, and the drain valve is closed. In this state, the fluid first enters the bypass port from the water inlet and then flows out directly from the other bypass port, and the fluid does not flow through the filter element. In this state, the flow state of the system is maintained unchanged, and the filter element can be disassembled for thorough cleaning and the drain valve can be thoroughly cleaned or repaired or replaced.

[0019] Drainage status: Cut off the circulation of the isolation system, control the hand wheel to rotate, the cleaning port of the valve core is directly opposite to the water inlet joint, the bypass port, the water outlet, the water inlet and the joint are misaligned, and the drain valve is opened. In this state, the fluid first enters the cavity between the filter element and the shell from the water inlet. Since the water outlet is closed, the fluid pushes the accumulated impurities to the drain valve at the other end under pressure. When the drainage channel is blocked, the pressure in the drain valve increases, the rotation of the rotating seat is controlled, and the rotating seat is linked to the external frame to rotate. The rubber strips on it scrape off the impurities attached to the filter element and the inner wall of the shell, and together with the loosened accumulated impurities on the prism, the impurities are finally discharged from the drain valve under the flushing of the fluid.

[0020] In the cut-off state, it is completely isolated from the system. The control hand wheel is turned, and the bypass port, water outlet, water inlet and cleaning port of the valve core are all misaligned with the joint. In this state, the filter is completely isolated from the system, and the drain valve and filter element can be disassembled for cleaning, maintenance or replacement. In this state, there is no loss of fluid in the system.

[0021] Beneficial effects: Compared with the prior art, the pre-filter of the present invention adopts a multifunctional valve core. By turning the hand wheel to drive the valve core to rotate the corresponding function identification scale, the corresponding function can be selected. It integrates bypass function, closing function, cleaning function and filtering function, eliminating the need to install a switch valve at the front and rear ends of the pipeline. At the same time, the external skeleton can be controlled to rotate outside the filter to clear the sewage discharge passage. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1: A schematic diagram of the structure of the pre-filter of the present invention;

[0023] Figure 2 : Schematic diagram of the structure explosion of the pre-filter of the present invention;

[0024] Figure 3 : A cross-sectional view of the structure of the filter of the present invention;

[0025] Figure 4 : Figure 3 The upper part of the cross-sectional view shown is an enlarged schematic diagram;

[0026] Figure 5 : Figure 3 The lower part of the cross-sectional view is enlarged schematic diagram;

[0027] Figure 6 : A structural diagram of the valve core;

[0028] Figure 7 : Another structural diagram of the valve core;

[0029] Figure 8 : Partial axial cross-sectional view of the filter in filtering state;

[0030] Fig. 9 : A partial radial cross-sectional view of the filter in filtering state;

[0031] Fig.10 : Partial axial cross-sectional view of the filter in bypass state;

[0032] Fig.11 : Partial radial cross-sectional view of the filter in bypass state;

[0033] Fig.12 : Partial axial cross-sectional view of the filter in the sewage discharge state;

[0034] Fig.13 : Partial radial cross-sectional view of the filter in the sewage discharge state;

[0035] Fig.14 : Partial axial cross-sectional view of the filter in the partition state;

[0036] Fig.15 : Partial radial cross-sectional view of the filter in the partition state;

[0037] In the figure: outer shell 1, step portion 101, support platform 102, flow groove 103, valve body 2, joint 3, first sealing ring 4, valve core 5, cylinder wall portion 501, bypass port 502, water outlet 503, partition portion 504, positioning portion 505, return water port 506, water inlet 507, cleaning port 508, shaft portion 509, notch 510, valve cover 6, second sealing ring 7, hand wheel 8, fastener 9, decorative beads 10, filter element 11, flange 111, third sealing ring 12, drain valve 13, outer frame 14, prism portion 141, flow port 142, connector 15, swivel seat 16, rubber strip 17, inner frame 18, fourth sealing ring 19. DETAILED DESCRIPTION

[0038] Next, a specific embodiment of the present invention is described in detail with reference to the accompanying drawings 1-15.

[0039] Reference Figure 1-5 A bypassable multifunctional pre-filter comprises a shell 1, one end of which is threadedly connected to a valve body 2, two connecting ends are provided on the valve body 2, and a connector 3 is threadedly connected to the connecting end. The connector 3 is used to connect with the pipeline in the system, connect the filter to the system, and the flow in the system flows into the filter from one of the connecting ends and finally flows out of the filter from the other connecting end.

[0040] A first sealing ring 4 is provided between the connecting end of the joint 3 and the valve body 2, in order to enhance the sealing performance of the connection between the joint and the valve body.

[0041] A valve core 5 is built into the valve cavity of the valve body 2. The valve core 5 is a special-shaped part and has rotational freedom in the valve cavity. It can be rotated at a predetermined angle in a controlled manner to achieve the purpose of fluid flow path selection and on-off control.

[0042] Referring to the valve body 6-7, the valve core 5 is preferably an integrally formed injection molded part, including a barrel wall portion 501 that cooperates with the inner wall of the valve cavity, and the side walls of the barrel wall portion 501 are relatively provided with a connected bypass port 502 and a water outlet 503. The internal space of the barrel wall portion in the valve core 5 is divided into two non-circulating spaces by the partition portion 504 and the flow channel walls of the two bypass ports 502. The partition portion is provided with a cylindrical protruding positioning portion 505, and a return port 506 connected to the water outlet 503 is formed in the positioning portion 505; the side walls of the barrel wall portion 501 are also provided with adjacent water inlet 507 and cleaning port 508, and the water inlet 507, the cleaning port 508 and the return port 506 are located on the same space side in the barrel wall portion 501; the valve core 5 also includes a rotating shaft portion 509 on a side different from the positioning portion 505, which is used to be non-rotatably connected to the handwheel.

[0043] One end of the valve body 2 is connected to the housing, and the other end is threadedly connected to a valve cover 6, which restricts the valve core 5 in the valve body, and a through hole is provided in the middle of the valve cover 6 for matching the rotating shaft 509 of the valve core, and the end of the rotating shaft 509 passes through the valve cover and is exposed to the valve body. A second sealing ring 7 is provided at the matching position between the rotating shaft 509 and the through hole of the valve cover to improve the sealing performance.

[0044] The valve core 5 has a rotational freedom relative to the valve body 2, and the power forcing it to rotate is a hand wheel 8 twisted by an operator. The hand wheel 8 is connected to the valve core 5 so that the two form a synchronously rotating whole.

[0045] In this embodiment, there is a notch 510 that destroys the roundness at the end of the shaft portion 509. Correspondingly, a slot that cooperates with the shaft portion 509 is provided on the handwheel 8. After the shaft portion 509 is inserted into the slot of the handwheel, a fastener 9 such as a screw is passed through the handwheel to lock it, aiming to prevent the handwheel from falling off. The two constitute a whole that rotates synchronously.

[0046] Preferably, the fastener 9 is embedded in the hand wheel after being matched, and the hand wheel is closed at the groove of the built-in fastener by a decorative bead 10, aiming to improve the aesthetics of the filter.

[0047] After the hand wheel is controlled to rotate, the linked valve core 5 rotates in the valve body 2, changing the corresponding relationship between the ports and the joints. A groove is provided at the end of the joint, and the first sealing ring 4 in the groove is used to isolate the joint and the valve core 5 to avoid mechanical contact between the two, and to improve the sealing performance of the joint and the valve core at the connection.

[0048] The housing 1 has a built-in filter element 11, which is cylindrical and densely covered with mesh holes, the size of which is preferably 40um. One end is open, and the open end fits in the positioning portion 505 of the valve core 5. The filter element and the positioning portion 505 are sealed by a third sealing ring 12. The return water port 506 is connected to the inner cavity of the filter element, and the other end of the filter element is a closed end.

[0049] The filter element 11 divides the inner cavity of the housing 1 into two parts, inner and outer, that is, there is a gap between the filter screen and the inner wall of the housing, and the gap is directly connected to the water inlet 507 and the cleaning port 508 of the valve core 5. The two spaces are connected through the mesh holes on the filter element. The fluid flows into the filter element from the outside through the mesh holes, and the impurities carried by the fluid are retained outside the filter element. The clean fluid after filtering is obtained in the filter element and flows out of the filter through the return port and the water outlet.

[0050] The filter element 11 has only one open end, and the open end is tightly matched with the positioning portion 505, and the other end is closed. In this state, the fluid to be filtered enters the filter element from the outside through the mesh, and its filtering effect is significantly higher than the current filter or magnetic filter. Because the current filter uses a filter screen with both ends open, the fluid flows from the outside into the filter screen, that is, the trapped impurities are inside the filter screen. Under this cleaning, the sealing and stability of both ends of the filter screen are difficult to ensure.

[0051] In the scheme of the present invention, impurities contained in the fluid are trapped outside the filter element 11, but the diameter of the filter element is close to the outer shell 1, that is, the volume outside the filter element where the impurities are located is much smaller than the volume inside the filter element, and the impurities are more likely to accumulate and block the flow path of the fluid. In order to intuitively display the enrichment of impurities, the outer shell 1 is made of a transparent material, such as acrylic.

[0052] Due to the fact that the wall of the filter element 11 is adjacent to the wall of the outer shell 1, impurities are easily enriched. When the amount of impurities reaches a certain level, they can be enriched to a level visible to the naked eye and can be cleaned in time. During cleaning, since the water outlet is closed, the fluid from the cleaning port 508 directly flushes on the enriched impurities. The flushing of the fluid can easily push the impurities to the drain valve at the end and remove them, and the direction and path of impurity removal are relatively single.

[0053] Again, refer to the attached Figure 2-5 , there is a radially protruding flange 111 at the end of the filter element 11, and a step portion 101 is provided at one end of the housing 1 connected to the valve body 2, and the flange 111 is fitted on the step portion 101, and there are multiple hollow settings on the flange 111 for fluid circulation. Based on the setting of the flange and the step portion, the matching setting at both ends of the filter element constitutes redundant positioning, which strengthens the position stability of the filter element under fluid flushing; this setting is more intended to guide the assembly of the filter. During assembly, the filter element is pre-installed into the housing along the axial direction until the flange fits on the step portion, and then the housing is rotated and connected to the valve body. During this process, the end of the filter element is forced to align with the positioning portion 505, and the matching accuracy is forced to be guaranteed.

[0054] Similarly, the connection between the housing 1 and the valve body 2 is also sealed by a fourth sealing ring 19 .

[0055] The other end of the housing 1 is connected to a drain valve 13, which communicates with the space where the impurities are located outside the filter element in the housing. Under normal filtering operation, the drain valve is in a cut-off state, and the impurities carried by the fluid are trapped in front of the drain valve. When the drain valve is activated, the water outlet is closed at the same time, and the fluid flowing into the water inlet flushes the impurities out of the drain valve, thereby achieving the purpose of sewage discharge.

[0056] The filter element 11 is stabilized in the housing 1 under the brushing of the fluid, and its closed end is limited axially and radially while ensuring that there is a passage for the fluid to flow to the drain valve. The filter element 11 is provided with an outer frame 14, which is composed of a plurality of staggered keels, and a protruding prism portion 141 is formed axially at the bottom, and a flow port 142 is provided on the side wall of the prism portion 141; the housing 1 is provided with a support 102 radially inward at the port, and the support 102 is provided with a flow groove 103 circumferentially, the outer frame 14 is against this support 102, and the flow groove 103 connects the space in the outer shell of the filter element with the valve cavity of the drain valve. When cleaning and draining, the fluid flushes the impurities accumulated in the outer shell of the filter element into the prism portion 141 through the flow groove 103 and the flow port 142, and finally discharged from the drain valve.

[0057] It can be seen that the flow path area of ​​the impurities when they are discharged is small and there are bends, which will increase the probability of impurities blocking the flow channel, especially at the turning point of the flow channel, which makes it difficult to clear the sewage channel even if the water inlet pressure is increased during sewage discharge. Based on this, this embodiment gives the exoskeleton 14 the freedom of controlled rotation, and the operator can force the exoskeleton to rotate to clear the blocked sewage channel. Specifically, a connector 15 is provided at the end of the outer shell 1, one end of the connector 15 cooperates with the prism portion 141 of the exoskeleton 14, and the other end is threadedly connected to the sewage valve. The connector has a section exposed to the outer shell 1, and a swivel 16 is sleeved on the section, and the swivel rotates synchronously with the connector. The synchronous rotation connection method can be that the connector is exposed on any non-circular surface of the section, so that the swivel 16, the connector 15 and the exoskeleton 14 form a linked swivel.

[0058] When the rotor is controlled to rotate, the exoskeleton stirs the fluid to create turbulence during rotation, and at the same time disturbs the accumulated and blocked impurities. At the turning point of the flow channel, based on the non-circular shape of the prism portion 141 of the exoskeleton, there is a periodic pushing effect on the surrounding impurities during its rotation. The accumulated impurities are loosened by the two-way action of the exoskeleton and the fluid until the flow channel is unblocked.

[0059] Furthermore, a plurality of rubber strips 17 are axially arranged on the outer frame 14. The thickness of the rubber strips 17 is greater than that of the outer frame, and protrusions are formed inside and outside the outer frame. The rubber strips are arranged to further intensify the formation of fluid turbulence when the swivel rotates, intensify the loosening of clogging impurities, and scrape off impurities attached to the filter element and the inner wall of the outer shell.

[0060] The diameter of the filter element 11 is smaller than the inner diameter of the outer frame, so that it can be axially placed in the outer frame under the premise of setting the rubber strip. An inner frame 18 is also arranged between the outer frame 14 and the filter element, which is used to axially and radially limit the closed end of the filter element. The edge of the inner frame 18 is L-shaped, forming a placement position, and a V-shaped sealing ring 19 is placed on the placement position. The V-shaped sealing ring seals the gap between the inner frame and the outer frame and radially positions the inner frame; the closed end of the filter element 11 is fixedly connected to the inner frame 18 by fasteners, that is, the end of the filter element is positioned by the inner frame. The inner frame isolates the filter element from the outer frame of the swivel, reduces the wear of the filter element, and prolongs the service life of the filter element.

[0061] The present invention replaces the stop valve of the filter inlet and outlet with a controlled rotating valve core 5. The fluid path can be selected by rotating the valve core to meet four different functions: filtration under normal system operation, filter element removal under system fluid bypass, filter element removal under the isolation system, and closing the outlet for sewage discharge.

[0062] Filter status: Refer to the attached Figure 8-9 When the system is working normally, the control hand wheel rotates, the water inlet 507 of the valve core is aligned with the water inlet joint, the water outlet 503 is aligned with the water outlet joint, the bypass port 502 and the cleaning port 508 are misaligned with the joint, and the drain valve 13 is closed. In this state, the fluid first enters the cavity between the filter element 11 and the housing 1 through the water inlet 507, then flows through the filter element into the filter element, and finally flows out of the filter through the return port 506 and the water outlet 503. The impurities carried in the fluid are retained by the filter element outside the housing.

[0063] Bypass status: Refer to the attached Figure 10-11 , when the system is working normally, the control hand wheel rotates, the two side ports 502 of the valve core are aligned with the water inlet and outlet joints, the water outlet 503, the water inlet 507, the cleaning port 508 and the joints are misaligned, and the drain valve 13 is closed. In this state, the fluid first enters the bypass port 502 from the water inlet 507 and then flows out directly from the other bypass port 502, and the fluid does not flow through the filter element. In this state, the flow state of the system is maintained unchanged, and the filter element can be disassembled for thorough cleaning and the drain valve can be thoroughly cleaned or repaired or replaced.

[0064] Discharge status: Refer to the attached Figure 12-13, cut off the circulation of the isolation system, control the hand wheel to rotate, the cleaning port 508 of the valve core is directly opposite to the water inlet joint, the bypass port 502, the water outlet 503, the water inlet 507 and the joint are misaligned, and the drain valve 13 is opened. In this state, the fluid first enters the cavity between the filter element 11 and the housing 1 from the water inlet 507. Since the water outlet is closed, the fluid pushes the accumulated impurities to the drain valve at the other end under pressure. When the drain channel is blocked, the pressure in the drain valve increases, the control seat 16 rotates, and the seat links the outer frame 14 to rotate. The rubber strip 17 arranged thereon scrapes off the impurities attached to the filter element and the inner wall of the housing, and together with the prism 141, loosens the accumulated impurities, and the impurities are finally discharged from the drain valve under the flushing of the fluid.

[0065] Partition status, see attached Figure 14-15 , completely isolated from the system, control the hand wheel to rotate, the bypass port 502, the outlet 503, the inlet 507 and the cleaning port 508 of the valve core are all misaligned with the joint. In this state, the filter is completely isolated from the system, and the drain valve and the filter element can be disassembled for cleaning, maintenance or replacement. In this state, there is no loss of fluid in the system.

[0066] The pre-filter of the present invention adopts a multifunctional valve core. The hand wheel drives the valve core to rotate the corresponding function identification scale to select the corresponding function. It integrates bypass function, closing function, cleaning function and filtering function, eliminating the need to install switch valves at the front and rear ends of the pipeline. At the same time, the external skeleton can be controlled to rotate outside the filter to clear the sewage discharge passage.

[0067] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A bypassable multifunctional pre-filter, comprising a housing (1), one end of the housing being connected to a valve body (2), and the other end of the housing being connected to a drain valve (13); Features: The valve body (2) is provided with two connection ends, and a valve core (5) is disposed in the valve cavity. The valve core (5) comprises a cylindrical wall portion (501) matched with the inner wall of the valve cavity, and a communicating bypass port (502) and a water outlet (503) are disposed on the side wall of the cylindrical wall portion (501). The internal space of the cylindrical wall portion is divided into two non-circulating spaces by a partition portion (504) and flow channel walls of the two bypass ports (502) in the valve core (5). A cylindrical protrusion is disposed on the partition portion to position the A portion (505) is formed in the positioning portion (505), and a water return port (506) connected to the water outlet (503) is formed therein; a water inlet (507) and a cleaning port (508) adjacent to each other are also provided on the side wall of the barrel wall portion (501), and the water inlet (507), the cleaning port (508) and the water return port (506) are located on the same side of the space in the barrel wall portion (501); the valve core (5) further includes a rotating shaft portion (509) on a side different from the positioning portion (505); The valve body (2) is connected to a valve cover (6), a through hole is provided in the middle of the valve cover (6), and the end of the rotating shaft (509) passes through the valve cover and is connected to a hand wheel (8), and the hand wheel (8) and the valve core (5) form a whole that rotates synchronously; The housing (1) has a filter element (11) built into it, one end of which is open and the other end of which is closed. The open end cooperates with the positioning portion (505), and the filter element (11) divides the inner cavity of the housing (1) into two parts, an inner part and an outer part. The end of the rotating shaft portion (509) has a notch (510) that destroys the roundness, and the hand wheel (8) is provided with a slot that matches the rotating shaft portion (509), and the rotating shaft portion is tightly locked in the slot; The filter element (11) has a radially protruding flange (111) at the end thereof, and the end of the housing (1) connected to the valve body (2) is provided with a step portion (101), the flange (111) is fitted on the step portion (101), and the flange (111) has a plurality of hollow portions for fluid circulation; The filter element (11) is provided with an outer frame (14) on its outer sleeve, and a protruding prism portion (141) is provided at the bottom, and a flow port (142) is provided on the side wall of the prism portion (141); the outer shell (1) is provided with a support platform (102) at the port, and the support platform (102) is provided with a flow channel (103), and the outer frame (14) is abutted against the support platform (102); A connecting piece (15) is provided at the end of the outer shell (1), one end of the connecting piece cooperates with the prism portion (141) of the outer frame (14), and the other end is connected to the drain valve. The connecting piece (15) has a section exposed outside the outer shell (1), and a synchronously rotating swivel seat (16) is sleeved on the section. The swivel seat (16), the connecting piece (15) and the outer frame (14) form a linked swivel.

2. The multifunctional pre-filter according to claim 1, characterized in that: It also includes a fastener (9), which is embedded in the hand wheel after being matched and is closed by a decorative bead (10).

3. The multifunctional pre-filter according to claim 1, characterized in that: The shell (1) is made of transparent material.

4. The multifunctional pre-filter according to claim 1, characterized in that: A plurality of rubber strips (17) are arranged on the outer frame (14) along the axial direction.

5. The multifunctional pre-filter according to claim 4, characterized in that: An inner frame (18) is also provided between the outer frame (14) and the filter element, and the edge of the inner frame is L-shaped, forming a placement position, on which a V-shaped sealing ring (19) is placed.

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