CN218636750U - Multifunctional pre-filter capable of bypassing - Google Patents

Abstract

A bypass multifunctional prefilter comprises a shell, wherein one end of the shell is connected with a valve body, and the other end of the shell is connected with a drain valve; the valve body is provided with two connecting ends, a valve core is arranged in the valve cavity, the valve body is connected with a valve cover, the middle part of the valve cover is provided with a through hole, the end part of the rotating shaft part penetrates through the valve cover and then is connected with a hand wheel, and the hand wheel and the valve core form a whole body which rotates synchronously; the shell is internally provided with a filter element, one end of the filter element is open, the other end of the filter element is closed, the open end is matched with the positioning part, and the inner cavity of the shell is divided into an inner part and an outer part by the filter element. The utility model discloses a leading filter adopts multifunctional valve core, rotates the hand wheel and drives the case and rotate and correspond different function sign scales and can select the function that corresponds, collects the bypass function, closes function, cleaning function, filtering capability in an organic whole, has saved the setting at pipeline front and back end installation ooff valve, can control the exoskeleton rotation outside the filter simultaneously, mediation blowdown route.

Description

Multifunctional pre-filter capable of bypassing

Technical Field

The utility model relates to a water purification system technical field, concretely relates to but multi-functional leading filter of bypass for satisfy the user demand of the different scenes of user.

Background

The pre-filter is applied to the front end of a household pipeline, and can be independently arranged at the front ends of a water purifier, a dish washer, a water heater, a boiler, a washing machine, a floor heating device, a radiating fin, a central air conditioner and the like.

The water supply is through the pipeline, and water flows in the pipeline and can also produce some pipeline impurities naturally, especially urban water supply pipeline, old and long, through long-term use, the impurity such as corrosion of pipeline, silt not only can lead to brown water and water equipment control failure, heat exchanger pipeline jam, fracture, and impurity can deposit on the pipeline, provides the hotbed for breeding of bacterium on the one hand, on the other hand can form the electro-chemical substance, can cause the corruption or the perforation of metal pipeline in short several months.

The scale is the most important factor for damaging equipment, the components of the scale are mainly calcium and magnesium as a large killer of a water pipeline and a container, and the scale of electric appliances needing to heat water such as a water heater, a water boiler and the like is particularly serious. The pre-filter can prevent the combination of calcium and magnesium ions and carbonate ions, play a role in preventing scale from being generated, and can form a nano-scale protective film on the inner wall of the water storage tank, so as to play a role in repairing the rust on the inner walls of the pipeline and the container. The pre-filter has a filtering precision of 5-100 microns, can filter impurities such as silt, rust, flotage and the like seen by naked eyes, and greatly prolongs the service life of subsequent equipment such as a faucet, a shower head, a washing machine, a water heater, a closestool and the like.

The existing pre-filter has a single function and only has a one-way water inlet end and a water removal end, and accordingly is installed in a system and used for filtering and intercepting impurities in fluid, but a filter screen in the system needs to be cleaned and separated from the system. However, the inlet and the outlet are provided with stop valves, and the filter is generally provided with a drain valve for draining sewage, so that the integral structure of the filter is complex and the cost is high; meanwhile, the current filter cleaning needs to block a fluid passage, so that the filter cleaning needs to be in a state that the system stops working, which is not in accordance with the actual situation.

Therefore, the utility model provides a multi-functional leading filter embeds a rotatable many-way case, changes the interior fluidic break-make and the circulation route of filter through rotating this case, has realized the switching of filter under different functions.

Disclosure of Invention

According to the problem that the background art provided, the utility model provides a but multi-functional leading filter of bypass solves, it is right next the utility model discloses do further to explain.

A multifunctional pre-filter capable of bypassing comprises a shell, wherein one end of the shell is connected with a valve body, and the other end of the shell is connected with a drain valve;

the valve body is provided with two connecting ends, a valve core is arranged in the valve cavity, the valve core comprises a cylindrical wall part matched with the inner wall of the valve cavity, the side wall of the cylindrical wall part is provided with a communicated by-pass port and a water outlet, the inner space of the cylindrical wall part is divided into two spaces which are not communicated by a partition part and a flow channel wall of the two by-pass ports in the valve core, the partition part is provided with a cylindrical protruding positioning part, and a water return port communicated to the water outlet is formed in the positioning part; the side wall of the cylindrical wall part is also provided with a water inlet and a cleaning opening which are adjacent, and the water inlet, the cleaning opening and the water return opening are positioned at the same space side in the cylindrical wall part; the valve core also comprises a rotating shaft part which is different from one side of the positioning part;

the valve body is connected with a valve cover, the middle part of the valve cover is provided with a through hole, the end part of the rotating shaft part penetrates through the valve cover and is connected with a hand wheel, and the hand wheel and the valve core form a synchronously rotating whole;

the shell is internally provided with a filter element, one end of the filter element is open, the other end of the filter element is closed, the open end is matched with the positioning part, and the inner cavity of the shell is divided into an inner part and an outer part by the filter element.

Preferably, the shell is made of transparent materials, and the enrichment condition of impurities is visually displayed.

Preferably, the filter element is sleeved with an outer framework, the bottom of the filter element is provided with a convex prism part, and the side wall of the prism part is provided with a flow port; the shell is provided with a bearing platform at a port, the bearing platform is provided with a flow passing groove, and the outer framework is abutted against the bearing platform. When the filter element is cleaned and drained, the fluid washes impurities accumulated in the outer shell of the filter element into the ridge part through the overflow groove and the overflow port, and finally the impurities are drained through the drain valve.

Preferably, the end of the outer casing is provided with a connecting piece, one end of the connecting piece is matched with the frustum pyramid part of the outer framework, the other end of the connecting piece is connected with the drain valve, the connecting piece is provided with a section exposed out of the outer casing, a rotating seat rotating synchronously is sleeved on the section, and the rotating seat, the connecting piece and the outer framework form a linkage rotating body. Giving the exoskeleton a degree of freedom for controlled rotation, enabling the exoskeleton to be forced by an operator to rotate to unblock a blocked trapway

Preferably, a plurality of rubber strips are arranged on the outer framework along the axial direction. The provision of the rubber strip is intended to further exacerbate the formation of turbulent flow of the fluid, the loosening action of clogging impurities, and the scraping of impurities adhering to the filter element and the inner wall of the housing.

The utility model discloses a controlled pivoted case has replaced the stop valve of filter inlet outlet, but through rotating case selection fluid route, satisfies the filtration under the normal work of system, and the filter core under the system's fluid bypass is dismantled, cuts off the filter core dismantlement under the system to and close four kinds of different functions of the blowdown of delivery port.

And (3) filtering state: when the system works normally, the hand wheel is controlled to rotate, the water inlet of the valve core is opposite to the water inlet joint, the water outlet of the valve core is opposite to the water outlet joint, the bypass port and the cleaning port are staggered with the joints, and the drain valve is closed. In this state, the fluid enters the cavity between the filter element and the shell through the water inlet, then flows through the filter element to enter the filter element, and finally flows out of the filter through the water return port and the water outlet, and impurities carried in the fluid are intercepted outside the filter element in the shell by the filter element.

A bypass state: when the system works normally, the control hand wheel rotates, the openings at two sides of the valve core are opposite to the water inlet and outlet joints, the water outlet, the water inlet, the cleaning port and the joints are staggered, and the drain valve is closed. In this state, the fluid enters the bypass port from the water inlet and then directly flows out from the other bypass port, and the fluid does not flow through the filter element. In this state, the circulation state of the system is maintained unchanged, and the filter element can be disassembled to be thoroughly cleaned and the drain valve can be thoroughly cleaned or maintained and replaced.

And (3) pollution discharge state: the circulation of the system is cut off, the hand wheel is controlled to rotate, the cleaning port of the valve core is opposite to the joint of water inlet, the by-pass port, the water outlet, the water inlet and the joint are staggered, and the drain valve is opened. Under this state, fluid gets into the chamber between filter core and the shell by the water inlet earlier, because the delivery port is closed, fluid will pile up the impurity under pressure and push the blowoff valve to the other end, when the blowdown channel blocks up, pressure increase in the blowoff valve, the control swivel mount rotates, swivel mount linkage exoskeleton rotates, the adhesive tape that establishes strikes off the impurity of attaching to on filter core and the shell inner wall, and with the not hard up accumulational impurity of prismatic portion, impurity is finally discharged by the blowoff valve under the fluid is washed.

And the valve core is in a cut-off state, the valve core is completely isolated from the system, the hand wheel is controlled to rotate, and the bypass port, the water outlet, the water inlet and the cleaning port of the valve core are staggered with the joint. In this state, the filter is completely isolated from the system, the blowoff valve and the filter element can be detached for cleaning, maintenance or replacement, and the fluid in the system is not lost in this state.

Has the advantages that: compared with the prior art, the utility model discloses a leading filter adopts multifunctional valve core, rotates the hand wheel and drives the case and rotate and correspond different function sign scales and can select the function that corresponds, collects bypass function, closing function, cleaning function, filtering capability in an organic whole, has saved the setting at pipeline front and back end installation ooff valve, can control outer skeleton rotation outside the filter simultaneously, dredge the blowdown route.

Drawings

FIG. 1: the structure schematic diagram of the pre-filter of the utility model;

FIG. 2: the structure of the pre-filter of the utility model is shown schematically in an explosion way;

FIG. 3: the utility model discloses a structural section view of the filter;

FIG. 4: FIG. 3 is an enlarged top view of the cross-sectional view;

FIG. 5 is a schematic view of: FIG. 3 is an enlarged view of the lower portion of the cross-sectional view;

FIG. 6: a schematic structure diagram of the valve core;

FIG. 7 is a schematic view of: the valve core is further structurally represented;

FIG. 8: a partial axial cross-sectional view of the filter in the filtered state;

FIG. 9: a partial radial section of the filter in the filtered state;

FIG. 10: a partial axial cross-sectional view of the filter in a bypass state;

FIG. 11: a partial radial cross-sectional view of the filter in a bypass state;

FIG. 12: a partial axial cross-sectional view of the filter in a blowdown condition;

FIG. 13: a partial radial cross-sectional view of the filter in a blowdown condition;

FIG. 14: a partial axial cross-sectional view of the filter in the blocked state;

FIG. 15: a partial radial cross-sectional view of the filter in the blocked state;

in the figure: the valve comprises a housing 1, a step part 101, a bearing platform 102, a flow passage groove 103, a valve body 2, a joint 3, a first sealing ring 4, a valve core 5, a cylinder wall part 501, a bypass port 502, a water outlet 503, a partition part 504, a positioning part 505, a water return port 506, a water inlet 507, a cleaning port 508, a rotating shaft part 509, a notch 510, a valve cover 6, a second sealing ring 7, a hand wheel 8, a fastening piece 9, a decorative bead 10, a filter element 11, a flange 111, a third sealing ring 12, a blow-off valve 13, an outer framework 14, a frustum part 141, a flow passage port 142, a connecting piece 15, a rotary seat 16, a rubber strip 17, an inner framework 18 and a fourth sealing ring 19.

Detailed Description

A specific embodiment of the present invention will be described in detail with reference to fig. 1-15.

Referring to the attached drawings 1-5, a multifunctional bypass prefilter comprises a housing 1, one end of which is connected with a valve body 2 in a threaded manner, two connecting ends are arranged on the valve body 2, the connecting ends are connected with a joint 3 in a threaded manner, the joint 3 is used for being connected with a pipeline in a system, the filter is connected into the system, the circulation in the system flows into the filter through one connecting end, and finally flows out of the filter through the other connecting end.

Be equipped with first sealing washer 4 between joint 3 and the 2 link of valve body, aim at the reinforcing and connect the leakproofness with the valve body junction.

The valve cavity of the valve body 2 is internally provided with a valve core 5, the valve core 5 is a special-shaped piece, and the valve core 5 has a rotational degree of freedom in the valve cavity and can be controllably rotated by a set angle, so that the aims of selecting and controlling the on-off of a fluid flow path are fulfilled.

Referring to the valve body 6-7, the valve core 5 is preferably an integrally formed injection molding, and includes a cylinder wall portion 501 matched with the inner wall of the valve cavity, a communicated bypass port 502 and a water outlet 503 are oppositely arranged on the side wall of the cylinder wall portion 501, the inner space of the cylinder wall portion is divided into two non-communicated spaces by a partition portion 504 and the flow channel walls of the two bypass ports 502 in the valve core 5, a cylindrical protruding positioning portion 505 is arranged on the partition portion, and a water return port 506 communicated with the water outlet 503 is formed in the positioning portion 505; the side wall of the cylindrical wall part 501 is also provided with a water inlet 507 and a cleaning port 508 which are adjacent, and the water inlet 507, the cleaning port 508 and the water return port 506 are positioned at the same space side in the cylindrical wall part 501; the valve core 5 further comprises a rotating shaft part 509 different from one side of the positioning part 505 and used for being connected with a hand wheel in a non-rotating mode.

One end of the valve body 2 is connected to the shell, the other end of the valve body is in threaded connection with a valve cover 6, the valve core 5 is limited in the valve body by the valve cover 6, a through hole is formed in the middle of the valve cover 6 and used for being matched with a rotating shaft part 509 of the valve core, and the end part of the rotating shaft part 509 penetrates through the valve cover and then is exposed out of the valve body. The matching part of the rotating shaft part 509 and the valve cover through hole is provided with a second sealing ring 7 for improving the sealing performance.

The valve core 5 has a rotational degree of freedom relative to the valve body 2, the rotational power of the valve core is forced to be a hand wheel 8 twisted by an operator, and the hand wheel 8 and the valve core 5 are connected to form a whole body rotating synchronously.

In this embodiment, a notch 510 that breaks the roundness is formed at the end of the rotating shaft 509, and correspondingly, a slot that is matched with the rotating shaft 509 is formed in the hand wheel 8, after the rotating shaft 509 is clamped into the slot of the hand wheel, and a fastening member 9, such as a screw, penetrates through the hand wheel to be locked tightly, so as to prevent the hand wheel from falling off, and the two form a whole that rotates synchronously.

Preferably, the fastener 9 is embedded in the hand wheel after being matched, and the hand wheel is sealed at the notch of the built-in fastener through the decorative bead 10, so that the attractiveness of the filter is improved.

After the hand wheel is controlled to rotate, the linkage valve core 5 rotates in the valve body 2, and the corresponding relation between each port and the joint arranged on the linkage valve core is changed. The joint end is provided with a groove, and a first sealing ring 4 in the groove is used for isolating the joint and the valve core 5 to avoid mechanical contact between the joint and the valve core and improving the sealing performance of the joint and the valve core at the joint.

The shell 1 is provided with a filter element 11 in a built-in manner, the filter element 11 is cylindrical, meshes are densely distributed on the filter element 11, the filter element has a size of preferably 40um, one end of the filter element is open, the open end is matched with the positioning part 505 of the valve element 5, the tightness between the filter element and the positioning part 505 is ensured through a third sealing ring 12, a water return port 506 is communicated with the inner cavity of the filter element, and the other end of the filter element is a closed end.

The filter element 11 divides the inner cavity of the shell 1 into an inner part and an outer part, namely, a gap is arranged between the filter screen and the inner wall of the shell, the gap is directly connected with the water inlet 507 and the cleaning port 508 of the valve element 5, the two spaces are communicated through meshes on the filter element, fluid flows into the filter element from the outside of the filter element through the meshes, the wrapped impurities are intercepted outside the filter element, and the filtered clean fluid is obtained in the filter element and flows out of the filter through the water return port and the water outlet.

In the state that only one end of the filter element 11 is open, the open end is tightly matched with the positioning part 505, and the other end is closed, the fluid to be filtered enters the filter element from the outside of the filter element through the meshes, and the filtering effect of the filter element is obviously higher than that of the current filter or magnetic filter. Because of what current filter adopted is that both ends are open filter screen, the fluid by the outflow income filter screen in, inside the impurity that held back was in the filter screen promptly, under this washing, the leakproofness and the steadiness at filter screen both ends are difficult to guarantee.

The utility model discloses a under the scheme, the impurity that the fluid was wrapped up in and is held back outside filter core 11, the diameter of natural filter core is close shell 1, and the volume outside the filter core at impurity place is far less than the volume in the filter core promptly, and impurity changes and piles up and block up fluidic runner. In order to visually display the enrichment condition of impurities, the shell 1 is made of transparent materials, such as acrylic.

Due to the characteristic that the wall of the filter element 11 is adjacent to the wall of the shell 1, so that impurities are easy to enrich, the impurities can be enriched to the extent that the impurities can be seen by naked eyes in the case of the impurities are in the existing amount, the impurities can be cleaned in time, in the cleaning process, because the water outlet is closed, the fluid from the cleaning port 508 directly washes the enriched impurities, the washing of the fluid is easy to push the impurities to a drain valve at the end part and is removed, and the direction path for removing the impurities is single.

Referring to fig. 2-5 again, a radially protruding flange 111 is provided at an end of the filter element 11, a step 101 is provided at an end of the housing 1 connected to the valve body 2, the flange 111 is fitted on the step 101, and a plurality of hollow portions are provided on the flange 111 for fluid circulation. Based on the arrangement of the flanges and the step parts, the flange and the step parts are matched with the two end parts of the filter element to form redundant positioning, so that the position stability of the filter element under the fluid scouring is enhanced; the filter is more designed to guide the assembly of the filter, the filter element is arranged into the shell along the axial direction in advance during the assembly until the flange is matched on the step part, then the shell is connected on the valve body in a rotating mode, the end part of the filter element is forcibly aligned to the positioning part 505 in the process, and the matching precision is forcibly guaranteed.

Similarly, the joint between the housing 1 and the valve body 2 is also enhanced in sealing performance by the fourth sealing ring 19.

The other end of the shell 1 is connected with a blowoff valve 13 which is communicated with the space where the impurities outside the filter element in the shell are located. Under normal filtration work, the blowoff valve is in the off state, and the impurity that the fluid was carried is held back before the blowoff valve, and after starting the blowoff valve, the delivery port was closed simultaneously, and the fluid that the water inlet flowed in flushes impurity from the blowoff valve, reaches the purpose of blowdown.

The filter element 11 is stabilized in the housing 1 under the brush of the fluid, and the closed end of the filter element is axially and radially limited while ensuring that a passage exists for the fluid to flow to the drain valve. An outer framework 14 is sleeved outside the filter element 11 and consists of a plurality of staggered keels, a convex frustum part 141 is axially formed at the bottom of the outer framework, and a flow passing opening 142 is formed in the side wall of the frustum part 141; the end opening of the shell 1 is provided with a bearing platform 102 in the radial inward direction, the bearing platform 102 is provided with a flow passing groove 103 in the circumferential direction, the outer framework 14 is abutted against the bearing platform 102, and the flow passing groove 103 communicates the space in the outer shell of the filter element with the valve cavity of the drain valve. During cleaning and sewage discharge, the impurities accumulated in the outer shell of the filter element are washed into the frustum part 141 by the fluid through the overflowing groove 103 and the overflowing opening 142 and finally discharged by the sewage discharge valve.

It can be seen that the small area of the flow passage and the folded direction of the path when the impurities are discharged will increase the probability of the impurities blocking the flow passage, especially at the turning part of the flow passage, which makes it difficult to dredge the sewage passage even if the water inlet pressure is increased during sewage discharge. Based on this, the present embodiment provides the outer frame 14 with a controlled rotational degree of freedom, and the operator can force the outer frame to rotate to dredge the blocked sewage draining channel, specifically, the end of the housing 1 is provided with a connecting member 15, one end of the connecting member 15 is matched with the frustum 141 of the outer frame 14, and the other end is in threaded connection with the sewage draining valve, the connecting member has a section exposed out of the housing 1, the section is sleeved with a swivel base 16, and the swivel base and the connecting member rotate synchronously, and the connection mode of synchronous rotation can be that the connecting member is exposed out of the section as any non-circular surface, so that the swivel base 16, the connecting member 15 and the outer frame 14 form a linkage swivel body.

After the rotating body is controlled to rotate, the outer framework stirs fluid to cause turbulence in the rotating process, simultaneously disturbs accumulated and blocked impurities, the ridge part 141 based on the outer framework is in a non-circular shape at the turning part of the flow passage, and periodically pushes the peripheral impurities in the rotating process, so that the accumulated impurities are loosened in the two-way action of the outer framework and the fluid until the flow passage is dredged.

Further, be provided with many adhesive tapes 17 along the axial on the exoskeleton 14, this adhesive tape 17 thickness is greater than the exoskeleton, forms the bulge in the exoskeleton inside and outside, and the setting of adhesive tape is aimed at when rotating along with turning, further aggravates the formation of fluid turbulent flow, aggravates the not hard up to stopping up impurity to strike off attached to the impurity of filter core and shell inner wall.

The diameter of the filter element 11 is smaller than the inner diameter of the outer framework, the outer framework can be axially placed under the condition that the rubber strips are arranged, and an inner framework 18 is further arranged between the outer framework 14 and the filter element and used for axially and radially limiting the closed end of the filter element. The edge of the inner framework 18 is L-shaped to form a placing position, a V-shaped sealing ring 19 is placed on the placing position, and the V-shaped sealing ring seals the interval between the inner framework and the outer framework and radially positions the inner framework; the closed end of the filter element 11 is fixedly connected with the inner frame 18 through a fastener, that is, the end of the filter element is positioned through the inner frame. The inner frame separates the filter element from the outer frame of the rotating body, reduces the abrasion of the filter element and prolongs the service life of the filter element.

The utility model discloses a controlled pivoted case 5 has replaced the stop valve of filter inlet outlet, but through rotating case selection fluid route, satisfies the filtration under the normal work of system, and the filter core under the system's fluid bypass is dismantled, cuts off the filter core dismantlement under the system to and close four kinds of different functions of the blowdown of delivery port.

And (3) filtering state: referring to fig. 8-9, in normal operation of the system, the control handwheel rotates, the water inlet 507 of the valve core faces the water inlet joint, the water outlet 503 faces the water outlet joint, the bypass port 502 and the cleaning port 508 are staggered with the joints, and the blowoff valve 13 is closed. In this state, fluid 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 water return port 506 and the water outlet 503, and impurities carried in the fluid are trapped outside the filter element in the housing by the filter element.

A bypass state: referring to fig. 10-11, under normal operation of the system, the control hand wheel rotates, the two side ports 502 of the valve core are opposite to the water inlet and outlet joints, the water outlet 503, the water inlet 507 and the cleaning port 508 are staggered with the joints, and the blowoff valve 13 is closed. In this state, the fluid enters the bypass port 502 from the water inlet 507 and then directly flows out from the other bypass port 502, and the fluid does not flow through the filter element. In this state, the circulation state of the system is maintained unchanged, and the filter element can be detached for complete cleaning and the blowdown valve can be completely cleaned or maintained and replaced.

And (3) pollution discharge state: referring to fig. 12-13, the system flow is cut off, the handwheel is controlled to rotate, the cleaning port 508 of the valve core is opposite to the joint of water inlet, the bypass port 502, the water outlet 503 and the water inlet 507 are staggered with the joint, and the blowoff valve 13 is opened. Under this state, the fluid enters the cavity between the filter element 11 and the shell 1 through the water inlet 507, because the water outlet is closed, the fluid pushes the accumulated impurities to the blow-off valve at the other end under the pressure, when the blow-off channel is blocked, the pressure in the blow-off valve is increased, the rotation of the rotary seat 16 is controlled, the rotary seat is linked with the outer framework 14 to rotate, the adhesive tape 17 arranged on the rotary seat scrapes the impurities attached to the inner walls of the filter element and the shell and loosens the accumulated impurities together with the prism part 141, and the impurities are finally discharged through the blow-off valve under the fluid flushing.

And (3) a separation state, referring to fig. 14-15, completely isolating the system, controlling the hand wheel to rotate, and staggering the bypass port 502, the water outlet 503, the water inlet 507 and the cleaning port 508 of the valve core with the joint. In this state, the filter is completely isolated from the system, the blowoff valve and the filter element can be detached for cleaning, maintenance or replacement, and the fluid in the system is not lost in this state.

The utility model discloses a leading filter adopts multifunctional valve core, rotates the hand wheel and drives the case and rotate and correspond different function sign scales and can select the function that corresponds, collects the bypass function, closes function, cleaning function, filtering capability in an organic whole, has saved the setting at pipeline front and back end installation ooff valve, can control the exoskeleton rotation outside the filter simultaneously, dredge the blowdown route.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (9)

1. A multifunctional pre-filter capable of bypassing comprises a shell (1), wherein one end of the shell is connected with a valve body (2), and the other end of the shell is connected with a drain valve (13);

the method is characterized in that:

the valve body (2) is provided with two connecting ends, a valve core (5) is arranged in the valve cavity, the valve core (5) comprises a cylinder wall part (501) matched with the inner wall of the valve cavity, the side wall of the cylinder wall part (501) is provided with a communicated by-pass port (502) and a water outlet (503), the inner space of the cylinder wall part is divided into two non-circulating spaces by a partition part (504) and the flow channel walls of the two by-pass ports (502) in the valve core (5), the partition part is provided with a cylindrical protruding positioning part (505), and a water return port (506) communicated with the water outlet (503) is formed in the positioning part (505); the side wall of the cylinder wall part (501) is also provided with a water inlet (507) and a cleaning port (508) which are adjacent, and the water inlet (507), the cleaning port (508) and the water return port (506) are positioned at the same space side in the cylinder wall part (501); the valve core (5) also comprises a rotating shaft part (509) which is different from one side of the positioning part (505);

the valve body (2) is connected with a valve cover (6), the middle part of the valve cover (6) is provided with a through hole, the end part of the rotating shaft part (509) penetrates through the valve cover and then is connected with a hand wheel (8), and the hand wheel (8) and the valve core (5) form a whole body which rotates synchronously;

a filter element (11) is arranged in the shell (1), one end of the filter element is open, the other end of the filter element is closed, the open end is matched with the positioning part (505), and the inner cavity of the shell (1) is divided into an inner part and an outer part by the filter element (11).

2. The multifunctional prefilter of claim 1 wherein: a notch (510) for destroying roundness is formed in the end portion of the rotating shaft portion (509), a clamping groove matched with the rotating shaft portion (509) is formed in the hand wheel (8), and the rotating shaft portion is tightly locked on the clamping groove.

3. The multifunctional prefilter of claim 2 wherein: the rotating shaft part (509) is clamped in a clamping groove of a hand wheel and passes through the hand wheel through a fastener (9) to be locked tightly, and the fastener (9) is embedded in the hand wheel after being matched and is sealed through a decorative bead (10).

4. The multifunctional prefilter of claim 1 wherein: the shell (1) is made of transparent materials.

5. The multifunctional prefilter of claim 1 wherein: the end of the filter element (11) is provided with a flange (111) protruding in the radial direction, one end of the shell (1) connected with the valve body (2) is provided with a step part (101), the flange (111) is matched on the step part (101), and the flange (111) is provided with a plurality of hollow parts for fluid circulation.

6. The multifunctional prefilter of claim 5 wherein: an outer framework (14) is sleeved outside the filter element (11), a protruded frustum pyramid part (141) is arranged at the bottom of the filter element, and a flow through opening (142) is formed in the side wall of the frustum pyramid part (141); the end opening of the shell (1) is provided with a bearing platform (102), the bearing platform (102) is provided with a flow passing groove (103), and the outer framework (14) is abutted against the bearing platform (102).

7. The multifunctional prefilter of claim 6 wherein: the end part of the shell (1) is provided with a connecting piece (15), one end of the connecting piece is matched with the frustum pyramid part (141) of the outer framework (14), the other end of the connecting piece is connected with the drain valve, the connecting piece (15) is exposed out of one section of the shell (1), a synchronously rotating swivel seat (16) is sleeved on the section, and the swivel seat (16), the connecting piece (15) and the outer framework (14) form a linked swivel body.

8. The multifunctional prefilter of claim 7 wherein: and a plurality of rubber strips (17) are arranged on the outer framework (14) along the axial direction.

9. The multifunctional prefilter of claim 8 wherein: still be provided with an inner frame (18) between exoskeleton (14) and the filter core, the inner frame edge is the L type, forms one and places the position, should place and place a V type sealing washer (19).

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