Pre-filter with valve core

Abstract

A pre-filter with a valve core and designed to prevent clogging includes a cylindrical body. A valve body is connected to the head of the cylindrical body, and the valve body has a return channel connecting to the outlet end of the valve body. A filter element is housed within the cylindrical body, with one end open and the other closed. The open end connects to the return channel of the valve body. A frame surrounds the filter element, with a protruding connector at one end. A connector is located at the tail end of the cylindrical body, with one end inside the cylindrical body and the other extending outside. The connector has a cavity inside serving as a flow channel. The exposed end of the connector connects to a drain valve and is fitted with a rotating sleeve. The connector has a flow channel inside and fits within the flow channel of the connector. The frame, connector, and rotating sleeve form a linked rotating body. This invention eliminates the need for a rotating, irregularly shaped valve core instead of a stop valve, reducing the complexity of the filter and simplifying the filter mode switching process, resulting in significant improvements in cost and operability.

Description

Technical Field

[0001] This invention relates to the field of water purification system technology, and more specifically to an anti-clogging pre-filter with a valve core. Background Technology

[0002] Pre-filters are used at the front end of household pipes, or can be installed independently at the front end of water purifiers, dishwashers, water heaters, boilers, washing machines, underfloor heating, radiators, central air conditioning, etc.

[0003] Water is supplied through pipes, and the flow of water in these pipes naturally produces some impurities. This is especially true for urban water supply pipes, which are old and long-standing. Over time, the rust, silt, and other impurities in these pipes can lead to brown water, malfunctions in water-using equipment, and blockages or cracks in heat exchanger pipes. Furthermore, these impurities can settle on the pipes, providing a breeding ground for bacteria and forming electrochemical compounds that can cause corrosion or perforation of metal pipes within just a few months.

[0004] Current pre-filters have a single function, with only a unidirectional inlet and outlet. They are installed in systems to filter and trap impurities in the fluid, but cleaning the filter screen requires isolating it from the system. The current method involves installing shut-off valves at both the inlet and outlet to close them. However, these shut-off valves, along with the filter's usual drain valve for wastewater discharge, result in a complex overall structure and high cost.

[0005] Furthermore, the current regular cleaning of the filter cannot completely remove the impurities accumulated inside, mainly because the impurities accumulate and block the drainage channel. Therefore, it is currently necessary to completely isolate the filter from the system for disassembly and cleaning.

[0006] Therefore, the present invention provides an anti-clogging pre-filter with a valve core, which has a built-in rotatable valve core. By rotating the valve core, the flow path of the fluid inside the filter is changed, realizing the switching of the filter between different functions of filtration and sewage discharge. In sewage discharge mode, the inside of the filter can be cleaned without disassembling the filter to remove the blockage of impurities. Summary of the Invention

[0007] In response to the problems raised in the background art, the present invention provides an anti-clogging pre-filter with a valve core to solve these problems, and the present invention will be further described below.

[0008] A pre-filter with a valve core and designed to prevent clogging includes a cylindrical body with a valve body connected to its head. The valve body has a return channel that connects to the outlet end of the valve body. A filter element is installed inside the cylindrical body, with one end open and the other end closed. The open end connects to the return channel of the valve body. A frame is fitted over the filter element, with a protruding connector at one end. A connector is provided at the tail end of the cylindrical body, with one end inside the cylindrical body and the other end extending outside. The connector has a cavity inside that serves as a flow channel. The exposed end of the connector is connected to a drain valve and fitted with a rotating sleeve. The connector has a flow channel inside and fits into the flow channel of the connector. The frame, connector, and rotating sleeve form a rotating mechanism.

[0009] Preferably, the cylinder is made of a transparent material, allowing for a direct display of the amount of impurities accumulated inside the filter.

[0010] Preferably, a cleaning component is fixed to the frame, which contacts both the inside of the cylinder and the outer surface of the filter element. When the cleaning component moves, the bristles brush across the inner wall of the cylinder and the outer surface of the filter element, removing tightly attached impurities.

[0011] Preferably, the bottom of the skeleton is a bone surface, which is spaced from the inner wall of the cylinder. A second support is provided inside the cylinder, and a guide groove is provided on the second support. The skeleton is placed on this second support, and a flow port is provided on the side wall of the skeleton connector. The flow port of the second support is positioned higher than the connector. When the fluid washes away impurities, the impurities can flow with the fluid through the guide groove and the flow port into the inner channel of the connector, carrying away the impurities accumulated under the bone surface.

[0012] Preferably, a gasket ring is supported on the second support platform. The gasket ring is annular with a protruding locking protrusion on its bottom surface, which engages with the guide groove. The top surface of the gasket ring is wavy in the circumferential direction. Simultaneously, the bottom of the frame's skeleton surface has correspondingly wavy protrusions that contact the gasket ring surface. There is a gap between the skeleton surface and the filter element, within which an elastic element is provided. The elastic element is in a compressed state. When the frame is rotated in a controlled manner, the wavy protrusions on the frame rotate relative to the gasket ring, causing the frame to undulate on the wavy surface of the gasket ring. The brush's action path is a superposition of straight and circular paths, resulting in a higher impurity removal effect. The frame reciprocates with slight vibration, causing pressure changes in the impurities at the blockage point, which further loosens the impurities.

[0013] Preferably, the positioning protrusion has a flow-through barrier, and the bone surface is provided with a flow-through perforation.

[0014] The fluid has multiple flow channels: one is the flow guide groove and flow port into the inner flow channel of the connector; the second is the flow on the bone surface into the lower part of the bone surface and then into the inner flow channel of the connector through the flow port; the third is the flow on the bone surface through the flow isolation of the positioning protrusion and then into the inner flow channel of the connector.

[0015] Preferably, a valve cavity is formed inside the valve body, and a valve core is provided inside the valve cavity. The interior is a hollow cavity, and an outlet and a return port are provided on it. The outlet and the return port are both connected to the internal hollow cavity to form a return channel. It also includes a rotating shaft, the end of which extends through the valve body and is connected to a rotating wheel. There is a solid part inside the valve cavity, and an inlet groove is provided on the solid part near the water inlet end.

[0016] Preferably, the valve body has a cylindrical cavity with open ends. A valve cover is connected to the valve body, and the valve cover has a through-hole. The rotating shaft of the valve core passes through the through-hole, and the part of the rotating shaft exposed outside the valve cover is connected to a rotating wheel. The valve core has a parallel convex ring that contacts and engages with the inner wall of the valve cavity. The solid part of the valve body has a positioning part that protrudes into the valve cavity. A sealing element is built into the outlet end of the valve body, and a clamping element is also threaded into the outlet end. The clamping element presses the sealing element onto the spherical surface of the valve core.

[0017] Preferably, the valve core has a pressure-guiding port at a 90° position in the clockwise or counterclockwise direction of the outlet, and the valve body has a pressure-transmitting port on the solid part at a 90° rotation position of the inlet end, which connects to the valve cavity. A pressure gauge is connected to the pressure-transmitting port. Alternatively, the valve core has a pressure-guiding port at each of the 90° positions in the clockwise and counterclockwise directions of the outlet, and the valve body has a pressure-transmitting port on the solid part at a 90° rotation position of the inlet end, which connects to the valve cavity. A pressure gauge is installed on one of the pressure-guiding ports. The pressure gauge can monitor the system pressure.

[0018] The filter of this invention abandons the method of setting separate shut-off valves at the inlet and outlet, and instead uses a rotating valve core, which has significant advantages in terms of cost and operability. The operator only needs to rotate the wheel to switch the working mode of the filter. The types of working modes and the switching methods are as follows:

[0019] Filtration Mode: Rotate the wheel to the "Filtration" indicator. At this time, the valve core's outlet is aligned with the valve body's outlet, the pressure guide port is aligned with the pressure transmission port, and the drain valve is closed. Fluid enters the system from the inlet end into the inlet groove on the valve body. Guided by the groove wall, it enters the cavity outside the filter element inside the cylinder. Under pressure, the fluid enters the filter element and finally flows back to the system through the valve core's return port to the outlet. Impurities carried in the fluid are trapped by the filter element and accumulate at the drain valve under the flushing action of the fluid. The pressure gauge displays the current system pressure in real time.

[0020] Sewage Discharge Mode: Rotate the wheel 180° to point to the "Sewage Discharge" indicator. At this time, the outlet of the valve core is misaligned with the outlet of the valve body, but the pressure guide port and pressure transmission port are still aligned, and the sewage discharge valve opens. Fluid enters the inlet groove on the valve body from the inlet end of the system, and enters the cavity outside the filter element inside the cylinder under the guidance of the inlet groove wall. The fluid has multiple flow channels: one is the guide groove and flow port into the inner channel of the connector; the second is entering from the surface of the rib and then entering the inner channel of the connector through the flow port; the third is flowing from the surface of the rib through the flow isolation of the positioning protrusion and then entering the inner channel of the connector. After multiple diversions and convergences, the pressure gauge can display the system pressure in real time under the current sewage discharge mode. When the pressure gauge reading indicates that the sewage discharge is obstructed, the rotating wheel is controlled to rotate, which in turn causes the filter frame to rotate. During the rotation of the frame, it undergoes rotational motion and is also pressed tightly against the gasket ring under the elastic force of the spring. Under the action of the undulating surface of the gasket ring, the frame also undergoes axial reciprocating motion. The superposition of these two motions causes the brushes on the frame to thoroughly scrape off the impurities adhering to the filter screen surface and the inner wall of the cylinder. By scraping off the attached impurities, the rotating and slightly vibrating frame connector can loosen the impurities accumulated at the tail end during rotation. Under the combined effect, the impurities can be quickly discharged from the filter.

[0021] Beneficial effects: Compared with the prior art, the filter of the present invention eliminates the use of a rotating, irregularly shaped valve core instead of a shut-off valve, which reduces the complexity of the filter and simplifies the filter mode switching steps, resulting in significant improvements in cost and operability. The present invention also features a manually controlled rotating wheel outside the cylinder, which, in conjunction with the internal frame, rotates and vibrates, loosening clogged impurities to accelerate their discharge. Therefore, the filter of the present invention does not require complete isolation from the system for disassembly and cleaning. Attached Figure Description

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

[0023] Figure 2 : Filter in Figure 1 Structural cross-sectional view at point AA;

[0024] Figure 3 : Structural sectional view of the cylinder;

[0025] Figure 4 : Schematic diagram of the filter element structure;

[0026] Figure 5 : Structural cross-sectional view of the gasket;

[0027] Figure 6 : Figure 2 Enlarged schematic diagram of the structure at point B;

[0028] Figure 7 : Figure 2Sectional view of the structure at point C;

[0029] Figure 8 : Schematic diagram of the valve body;

[0030] Figure 9 : A sectional view of the valve body;

[0031] Figure 10 Schematic diagram of the valve core structure;

[0032] In the diagram: 1. Cylinder body; 101. Support platform; 102. Second support platform; 103. Guide channel; 104. Anti-rotation channel; 2. Valve body; 201. Return channel; 202. Valve cavity; 203. Solid part; 204. Inlet channel; 205. Pressure transmission port; 206. Positioning part; 3. Filter element; 301. Positioning protrusion; 302. Stop step; 303. Circular cutout; 304. Anti-rotation protrusion; 4. Drain valve; 5. Frame; 501. Connector; 502. Flow port 503, corrugated convex part 504, guide tube 505, flow isolation part 506, flow perforation part 507, connector 6, cap edge 601, rotating sleeve 7, washer ring 8, locking convex part 801, corrugated surface 802, elastic part 9, valve core 11, water outlet 111, water return port 112, rotating shaft 113, pressure guide port 114, convex ring part 115, rotating wheel 12, valve cover 13, sealing part 14, clamping part 15. Detailed Implementation

[0033] The following detailed description of a specific embodiment of the present invention is based on the accompanying drawings.

[0034] Reference Appendix Figure 1-2 A pre-filter with a valve core for preventing clogging includes a cylindrical body 1, one end of which is threadedly connected to a valve body 2. The valve body 2 has two connecting ends for inlet and outlet water, and the connecting ends are provided with threads for connecting to the pipeline of the system, so that the filter can be connected to the system. The fluid in the system flows into the filter from the inlet end, and after being filtered, it finally flows out of the filter from the outlet end.

[0035] The appendix Figure 2 There is a return channel 201, which is connected to the outlet end of the valve body. The valve body 2 is an irregular part, and its inlet end is not directly connected to the return channel. The fluid enters the magnetic filter at the inlet end and then flows back after being filtered by the filter element 3.

[0036] Reference Appendix Figure 2-3 The filter element 3 is built into the cylinder 1 and can be a simple single-layer filter screen or other filter element that can perform filtration. It is preferably densely covered with 40um mesh. One end of the filter element 3 is open and the other end is closed. The open end is connected to the return channel 201 of the valve body 2. That is, the filter element divides the inner cavity of the cylinder into two spaces, the inner and outer spaces of the filter element, which are connected by the mesh.

[0037] During filtration, the system fluid enters the space inside the outer cylinder of the filter element through the water inlet end of valve body 2, and then flows from the outside of the filter element through the mesh under pressure to enter the inside of the filter element. Impurities carried by the fluid are trapped on the outside of the filter element. The filtered fluid finally flows out of the filter through the return channel and returns to the system.

[0038] Impurities move towards the tail of the filter under the flushing of the fluid and gradually accumulate at the tail of the cylinder, which is different from the tail of the connected valve body 2. In order to clean the accumulated impurities periodically, a drain valve 4 is connected to the tail of the cylinder 1. The valve chamber of the drain valve is connected to the inner cavity of the cylinder. When the drain valve is opened, the filter enters the drain mode, and the impurities will be discharged by the drain valve under the flushing of the fluid.

[0039] In practice, the cleaning frequency of impurities is related to the degree of impurity accumulation. The fluid relied on for filter discharge comes from the system. Excessive impurity accumulation will breed bacteria. After the impurities accumulate, they gradually compact under fluid pressure and block the discharge channel. When the drain valve is opened in a controlled manner, the fluid cannot flush out the blocked impurities, and the pressure inside the filter rises. To avoid impurity accumulation, the cleaning frequency can be increased. However, frequent shutdowns of the system are not normal.

[0040] To visually display the amount of impurities accumulated inside the filter, the cylinder 1 is made of a transparent material, such as acrylic. When the impurities accumulate to an appropriate amount, they will be visible to the observer, and then the drain valve can be activated to perform a draining operation.

[0041] Reference Appendix Figure 2 and 6 To loosen the accumulated impurities, this embodiment includes a frame 5 surrounding the filter element 3. This frame 5 can be rotated in a controlled manner, loosening the impurities during rotation. A connector 6 is provided at the tail end of the cylinder 1. The connector is a rotating component, with one end inside the cylinder and the other end extending outside. The interior of the connector is a cavity serving as a flow channel. The exposed end of the connector has threads on its inner wall for threaded connection with the drain valve 4, while a rotating sleeve 7 is fitted on its outer wall. The rotating sleeve 7 serves as a control component for the operator's twisting action. When controlled, it rotates in place, causing the connector 6, which is connected to it, to rotate synchronously.

[0042] The frame 5 has a protruding connector 501 at its end. The connector is hollow and also serves as a flow channel. When the connector 501 is fitted into the flow channel of the connector 6, the frame and the connector form a synchronously rotating whole. In the example given in this embodiment, the cross-section of the connector flow channel and the connector is a regular quadrilateral. After fitting, the frame 5, the connector 6, and the rotating sleeve 7 form a linked rotating body.

[0043] When the rotating sleeve 7 is rotated under control, the linkage frame 5 rotates. The rotating frame changes the state of the fluid, and the fluid is violently disturbed to form complex turbulence. The turbulence washes away the impurities attached to the inner wall of the cylinder and the surface of the filter element. The frame has a loosening effect on the accumulated and blocked impurities, and finally they are discharged by the drain valve under the entrainment of the fluid.

[0044] Reference Appendix Figure 6 The connector 6, located inside the cylinder 1, has a radially enlarged end forming a cap 601. The tail end of the cylinder has a recessed, stepped support 101, and the cap 601 fits into this support 101. During installation, the connector is inserted from the open end of the cylinder (the end connected to the valve body) until the cap aligns with the support. This design prevents the connector from being dislodged under the influence of rotating sleeves and the scouring action of fluid.

[0045] The tail end of the cylinder 1 has a transition arc with a changing diameter. One side of the rotating sleeve 7 is in contact with the transition arc surface of the cylinder, and the other side is in contact with the protrusion of the drain valve. When the drain valve is connected to the connector, the cylinder and the drain valve provide axial restraint on the rotating sleeve 7, and the sleeve only has rotational freedom.

[0046] For impurities adhering to the filter element and cylinder that cannot be washed away by fluid, especially those at the filter element mesh, this embodiment utilizes a cleaning component, preferably a brush, fixed to a rotatable frame 5. The brush contacts both the inside of the cylinder and the outer surface of the filter element. As the brush moves, the bristles sweep across the inner wall of the cylinder and the outer surface of the filter element, removing the tightly adhering impurities. Furthermore, due to the flexible nature of the bristles, there is no force exerted on the filter element that causes deformation.

[0047] The bottom of the skeleton 5 has a bone surface 502, which is spaced from the inner wall of the cylinder. This is to prevent impurities from being hidden between the bone surface and the inner wall of the cylinder and thus difficult to be flushed into the drain valve by the fluid. A second support platform 102 is provided inside the cylinder 1. The second support platform 102 has a circumferential array of guide grooves 103. The skeleton 5 is placed on this second support platform. The side wall of the skeleton connector 501 has a flow port 503, and the flow port is positioned higher than the connector on the second support platform. When the fluid flushes away impurities, the impurities can flow with the fluid through the guide grooves and flow ports into the inner channel of the connector, carrying away the impurities accumulated under the bone surface.

[0048] Reference Appendix Figure 5-6 The second support 102 supports a gasket 8, which is annular and has a locking protrusion 801 on its bottom surface. The locking protrusion fits into the guide groove 103. The top surface of the gasket has a wavy surface 802 with a small undulation amplitude. At the same time, the bottom of the bone surface 502 of the skeleton 5 is also provided with a wave protrusion 504 with a corresponding amplitude. The wave protrusion 504 contacts the surface of the gasket 8. There is a gap between the bone surface 502 and the filter element 3. An elastic element 9 is provided in the gap. The elastic element is preferably a spring.

[0049] The spring is always in a compressed state, and its elastic force presses the washer 8 tightly against the second support 102. When the frame 5 is rotated in a controlled manner, the wave protrusion 504 on the frame rotates relative to the washer. Based on the washer's locking protrusion, it is locked at the guide groove 103 of the second support. The washer has no rotational freedom, forcing the frame 5 to move up and down on the wave surface of the washer.

[0050] The reaction is reflected in the frame 5, where the frame undergoes a combined motion of rotation and linear displacement along the cylinder axial direction. This results in the brush's action path on the inner wall of the cylinder and the filter element surface being a superposition of linear and circular paths, leading to a higher impurity removal efficiency, especially on the mesh surface of the filter element. Under the combined action of the spring and the washer ring, the frame reciprocates slightly, causing pressure changes in the impurities at the blockage points and further loosening them.

[0051] Reference Appendix Figure 4 and 6 The bottom surface of filter element 3 is provided with a protruding positioning protrusion 301, and a guide tube 505 is integrally provided on the skeleton surface 502. The positioning protrusion 301 is fitted inside the guide tube 505, which provides radial limiting effect on the skeleton, maintaining the stability of the filter element in the fluid and preventing it from shaking, especially maintaining the sealing at the connection between the filter element and the valve body. The spring 9 is sleeved on the positioning protrusion 301 to provide radial positioning of the spring. The bottom of the spring 9 abuts against the positioning protrusion, and the top abuts against the bottom surface of filter element 3.

[0052] Reference Appendix Figure 6 The guide tube 505 has a flow barrier 506, and the bone surface 502 is provided with a flow perforation 507. The fluid has multiple flow channels: one is that the fluid enters the inner channel of the connector through the guide groove 103 and the flow port 503; the second is that the fluid enters the inner channel of the connector through the flow port 503 after entering the bone surface; and the third is that the fluid enters the inner channel of the connector after passing through the flow barrier of the positioning protrusion 301 on the bone surface.

[0053] The filter of this invention has a filtration mode and a drain mode. In filtration mode, fluid enters the filter from the inlet, is filtered, and then flows out of the filter through the return channel back into the system. However, in drain mode, fluid still enters the filter from the inlet, but the return channel is blocked, and the fluid cannot return to the system through the return port; all fluid is flushed out through the drain valve. Current mainstream filters use a shut-off valve at the outlet to cut off the backflow. The filter of this invention replaces the shut-off valve with a valve core; rotating the valve core controls the opening and closing of the return channel.

[0054] Reference Appendix Figure 7-10A valve cavity 202 is formed within the valve body 2. A valve core 11 is disposed within the valve cavity. The valve core 11 is a rotating body with rotational freedom. The main body is a sphere with an internal cavity. An outlet 111 and a return outlet 112 are disposed on the sphere. Both the outlet and the return outlet are connected to the cavity inside the sphere, forming a return channel 201. The valve core 11 also includes a rotating shaft 113 integrally connected to the sphere. The end of the rotating shaft extends through the valve body and is connected to a rotating wheel 12. The rotating shaft and the rotating wheel rotate synchronously to control the rotation by a predetermined angle.

[0055] The valve body 2 has a solid part 203 inside the valve cavity, which separates the water inlet end from the valve cavity 202. The solid part is provided with an inlet groove 204 near the water inlet end. The inlet groove is connected to the water inlet end, and the valve cavity is connected to the water outlet end. The purpose is to deflect the fluid into the filter and then let it flow out through the valve core after filtration.

[0056] Reference Appendix Figure 7 The inlet channel 204 is preferably arc-shaped, with the arc and the return port 112 sharing the same center. The inlet end is connected to the middle of this arc-shaped inlet channel, and the central angle corresponding to the arc-shaped inlet channel is selected at 160°. This is intended to maximize the volume of the inlet channel while providing pressure transmission ports 205 connected to the valve cavity on the solid part at 90° on both sides of the inlet end of the valve body.

[0057] Reference Appendix Figure 8-9 The valve cavity 202 of the valve body is a cylindrical cavity. In this embodiment, both ends of the cylindrical cavity are open. The valve core is placed into the valve cavity through the open. A valve cover 13 is connected to the valve body 2 by a detachable connection method such as a threaded connection. The valve cover is provided with a through port. The rotating shaft 113 of the valve core 11 passes through the through port. The part of the rotating shaft 113 exposed outside the valve cover is fixedly connected to the rotating wheel 12 by fasteners. The rotating wheel 12 serves as the operator's control component. After being controlled to rotate, it links the valve core to rotate.

[0058] Reference Appendix Figure 10 The main body of the valve core 11 has a parallel convex ring 115 integrally connected to it. The convex ring 115 contacts and cooperates with the inner wall surface of the valve cavity 202, which is intended to limit the valve core radially. At the same time, there is a positioning part 206 protruding into the valve cavity 202 in the solid part 203 of the valve body 2. After the valve cover 13 is screwed onto the valve body 2, the convex ring 115 of the valve core 11 is pressed on the step surface formed by the positioning part 206. The step surface and the valve cover limit the valve core axially. In the end, the valve core only has the degree of freedom of rotation within the valve cavity.

[0059] Referring to valve body 7, a sealing element 14 is built into the outlet end of valve body 2. A clamping element 15 is also threadedly connected inside the outlet end. The clamping element presses the sealing element onto the spherical surface of valve core 11, aiming to improve the sealing performance of outlet 111 and isolate the fluid before and after filtration. The sealing element is cylindrical, and one end of the clamping element radially narrows to form a step. The inner and outer surfaces of the end of the sealing element 14 contact the clamping element and the inner wall surface of the outlet end of valve body 2, respectively, to install and stabilize the sealing element.

[0060] By relying on the irregularly shaped valve body 2 and valve core 11, the closure of the filter return channel of the present invention relies solely on the rotation of the valve core: as mentioned above, the position of the valve body 2 is fixed, and the position of the water inlet (inlet groove) provided on it is fixed. The flow state of the fluid does not change with the rotation of the valve core. However, the valve core 11 has a degree of rotational freedom, and the water outlet 111 provided on it rotates with it. When the water outlet rotates and is misaligned with the water outlet of the valve body, it can fit into the solid part of the valve body, at which time the return path is blocked.

[0061] Reference Appendix Figure 4 and 2 One end of the filter element 3 is connected to the return port 112 of the valve core 11. Specifically, the end of the filter element 3 is coaxially fitted in the positioning part 206 of the valve body 2. The end of the filter element has a stop step 302 formed by the change in diameter. The existence of this stop step is intended to allow the stop step to abut against the positioning part of the valve body after the filter element is axially fitted into the valve body 2. When installed in place, the end face of the filter element is spaced from the convex ring part 115 of the valve core to avoid the force exerted on the filter element after the valve core rotates.

[0062] The filter element 3 has a radially protruding circular hole 303 at its end. The circular hole has a flow groove to connect the spaces on both sides of the circular hole for fluid flow. The edge of the circular hole 303 is also arranged with anti-rotation protrusions 304 arranged radially outward in a circular array. At the same time, the end of the cylinder 1 is arranged with an anti-rotation groove 104 in a circular array. The anti-rotation protrusions 304 are fitted into the anti-rotation groove 104.

[0063] The anti-rotation groove of the cylinder and the positioning part 206 of the valve body 2 simultaneously axially position the end of the filter element, keeping the spring between the filter element and the skeleton surface in a compressed state to position the filter element in the cylinder; at the same time, the anti-rotation groove also has a rotation limiting function for the filter element, so that the filter element can remain stable under the flushing of fluid and the rotation of the rotating sleeve 7 and the linkage of the skeleton 4. At this time, the presence of the spring isolates the surface contact between the skeleton surface and the filter element.

[0064] As is well known, there are safe operating pressure limits for system operation. Generally, an independent pressure gauge is installed at one point in the system pipeline to monitor the system pressure. The filter of the present invention, as a working node in the system, can improve the system integration by installing the pressure gauge on the valve body 2.

[0065] Specifically, a pressure-guiding port 114 is provided on the ball of the valve core 11 at a position 90° in its rotation direction, while a pressure-transmitting port 205 is provided on the solid part of the valve body 2 at a 90° rotation position at the water inlet end, connecting to the valve cavity. A pressure gauge is connected to the pressure-transmitting port 205. In filtration mode, the fluid pressure inside the filter is reflected on the pressure gauge. The process of the fluid entering the filter and flowing back through the filter element makes the filter equivalent to a bend in the gauge, so the pressure gauge can be directly installed on the valve body. Only one pressure-guiding port 114 needs to be provided on the ball of the valve core 11. In drain mode, after the valve core rotates 180°, the pressure-guiding port 114 and the pressure-transmitting port 205 are misaligned, and the pressure gauge is isolated from the system.

[0066] Reference Appendix Figure 10 In a preferred embodiment, the valve core 11 ball has two opposing pressure guide ports 114, which are respectively installed with pressure gauges and other components such as exhaust valves, or directly sealed with plugs. In this case, after the valve core is rotated 180°, the pressure gauge can still monitor the system pressure. That is, regardless of the filtration mode or the sewage discharge mode, the pressure gauge monitors the system pressure. Especially in the sewage discharge mode, when impurities accumulate and block the filter and cannot be discharged smoothly, the pressure inside the filter increases. At this time, the increased pressure of the pressure gauge can intuitively indicate to the operator to rotate the rotating sleeve 7 to loosen the blocked impurities.

[0067] The filter of this invention abandons the method of setting separate shut-off valves at the inlet and outlet, and instead uses a rotating valve core, which has significant advantages in terms of cost and operability. The operator only needs to rotate the rotating wheel 12 to switch the working mode of the filter. The types of working modes and the switching methods are as follows:

[0068] Filtration Mode: Rotate wheel 12 to the "Filtration" indicator. At this time, the outlet 111 of valve core 11 is aligned with the outlet of valve body 2, and the pressure guide port 114 is aligned with the pressure transmission port 205. The drain valve is closed. Fluid enters the system from the inlet end into the inlet groove 204 on valve body 2. Guided by the groove wall, the fluid enters the cavity outside the filter element inside the cylinder. Under pressure, the fluid enters the filter element and finally flows back to the system through the return port 112 of the valve core to the outlet 111. Impurities carried in the fluid are trapped by the filter element and accumulate at the drain valve under the flushing action of the fluid. The pressure gauge displays the current system pressure in real time.

[0069] Sewage Discharge Mode: Rotating the wheel 12 180° to point to the "Sewage Discharge" indicator, the outlet 111 of the valve core 11 is misaligned with the outlet end of the valve body 2, while the pressure guide port 114 and the pressure transmission port 205 remain aligned, and the sewage discharge valve opens. Fluid enters the inlet groove 204 on the valve body 2 from the inlet end of the system, and enters the cavity outside the filter element inside the cylinder under the guidance of the inlet groove wall. The fluid has multiple flow channels: one is through the guide groove 103 and the flow port 503 into the inner channel of the connector; the second is through the surface of the rib and then into the inner channel of the connector through the flow port 503; the third is through the surface of the rib, passing through the flow isolation of the positioning protrusion 301, and then into the inner channel of the connector. After multiple diversions and convergences, the pressure gauge can display the system pressure in real time under the current sewage discharge mode. When the pressure gauge reading indicates that the sewage discharge is not smooth, the rotating wheel 12 is rotated under control, which in turn causes the frame to rotate. During the rotation of the frame, the frame is both rotating and pressed tightly against the gasket 8 by the elastic force of the spring 9. Under the action of the undulating surface of the gasket 8, the frame also has axial reciprocating motion. The superposition of these two motions causes the brushes on it to thoroughly scrape off the impurities adhering to the filter screen surface and the inner wall of the cylinder. While scraping off the attached impurities, the rotating and slightly vibrating frame connector can loosen the impurities accumulated at the tail end during rotation. Under the combined effect, the impurities can be quickly discharged from the filter.

[0070] The filter of this invention eliminates the need for a rotating, irregularly shaped valve core instead of a shut-off valve, reducing the filter's complexity and simplifying the mode switching process, resulting in significant improvements in cost and operability. Furthermore, this invention features a manually controlled rotating wheel outside the filter cylinder, which, in conjunction with the internal frame, rotates and vibrates, loosening clogged impurities and accelerating their discharge. Therefore, the filter of this invention does not require complete isolation from the system for disassembly and cleaning.

[0071] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A pre-filter with a valve core for preventing clogging, comprising a cylindrical body (1), a valve body (2) connected to the head of the cylindrical body, the valve body (2) having a return channel (201) connected to the outlet end of the valve body, and a filter element (3) built into the cylindrical body, wherein one end of the filter element (3) is open and the other end is sealed, and the open end is connected to the return channel (201) of the valve body (2); characterized in that: The filter element (3) is covered by a frame (5) and has a protruding connector (501) at the end; the cylinder (1) has a connector (6) at the tail end, one end of the connector is inside the cylinder and the other end extends outside the cylinder. The inside of the connector is a cavity that serves as a flow channel. The exposed end of the connector is connected to the drain valve (4) and is covered by a rotating sleeve (7); the connector (501) has a flow channel inside and is fitted into the flow channel of the connector (6). The frame (5), the connector (6) and the rotating sleeve (7) form a rotating body that is linked together. A cleaning component is fixed on the frame (5), and the cleaning component contacts the inside of the cylinder and the outer surface of the filter element respectively; The bottom of the skeleton (5) is a bone surface (502), which is spaced from the inner wall of the cylinder. The cylinder (1) is provided with a second support (102), and a guide groove (103) is provided on the second support (102). The skeleton (5) is placed on this second support. The side wall of the skeleton connector (501) is provided with a flow port (503). The second support is positioned higher than the connector. A pad ring (8) is supported on the second support (102). The pad ring is annular, with a protrusion on the bottom surface. The protrusion fits into the guide groove (103), and the top surface of the pad ring is wavy in the circumferential direction. The bottom of the bone surface (502) of the skeleton (5) is provided with a wave protrusion (504) with a corresponding amplitude. The wave protrusion (504) contacts the surface of the pad ring (8). There is a gap between the bone surface (502) and the filter element (3). An elastic element (9) is provided in the gap. The elastic element is in a compressed state.

2. The anti-clogging pre-filter according to claim 1, characterized in that: The cylindrical body (1) is made of transparent material.

3. The anti-clogging pre-filter according to claim 2, characterized in that: The connector (6) is radially expanded at one end inside the cylinder (1) to form a cap (601), and the tail end of the cylinder is provided with a recessed, stepped support (101), and the cap (601) fits into this support (101).

4. The anti-clogging pre-filter according to claim 3, characterized in that: The cylinder (1) has a transition arc with a changing diameter at its tail end. One side of the rotating sleeve (7) is in contact with the transition arc surface of the cylinder, and the other side is in contact with the protrusion of the drain valve.

5. The anti-clogging pre-filter according to claim 1, characterized in that: The elastic element is a spring. The bottom surface of the filter element (3) is provided with a protruding positioning protrusion (301). A guide tube (505) is integrally provided on the bone surface (502). The positioning protrusion (301) is fitted inside the guide tube (505), and the spring is sleeved outside the positioning protrusion (301).

6. The anti-clogging pre-filter according to claim 5, characterized in that: The guide tube (505) has a flow-through partition (506), and the bone surface (502) is provided with a flow-through perforation (507).

7. The anti-clogging pre-filter according to any one of claims 1-6, characterized in that: A valve cavity (202) is formed inside the valve body (2), and a valve core (11) is provided inside the valve cavity. The interior is a hollow cavity, and an outlet (111) and a return outlet (112) are provided on it. The outlet and the return outlet are both connected to the internal hollow cavity to form a return channel (201). It also includes a rotating shaft (113), the end of which extends through the valve body and is connected to a rotating wheel (12). There is a solid part (203) inside the valve cavity, and an inlet groove (204) is provided near the inlet end of the solid part. The valve cavity (202) of the valve body (202) 2) It is a cylindrical cavity with open ends. A valve cover (13) is connected to the valve body (2). The valve cover has a through port. The rotating shaft (113) of the valve core (11) passes through the through port. The part of the rotating shaft (113) exposed outside the valve cover is connected to the rotating wheel (12). The valve core (11) has a parallel convex ring (115). The convex ring (115) contacts and cooperates with the inner wall of the valve cavity (202). The solid part (203) of the valve body (2) has a positioning part (206) protruding into the valve cavity (202).

8. The anti-clogging pre-filter according to claim 7, characterized in that: The valve body (2) has a built-in sealing element (14) at the outlet end, and a pressing element (15) is also threadedly connected inside the outlet end. The pressing element presses the sealing element onto the spherical surface of the valve core (11). The sealing element is cylindrical, and one end of the pressing element is radially reduced to form a step. The inner and outer surfaces of the end of the sealing element (14) are in contact with the pressing element and the inner wall surface of the outlet end of the valve body (2), respectively.

9. The anti-clogging pre-filter according to claim 8, characterized in that: The open end of the filter element (3) is coaxially fitted in the positioning part (206) of the valve body (2), and there is a stop step (302) formed by the change in diameter at the end of the filter element, which abuts against the positioning part of the valve body.

10. The anti-clogging pre-filter according to claim 9, characterized in that: The filter element (3) has a circular hole (303) protruding radially at its end. There is a flow groove on the circular hole. An anti-rotation protrusion (304) is provided radially outward at the edge of the circular hole (303). At the same time, an anti-rotation groove (104) is provided at the end of the cylinder (1). The anti-rotation protrusion (304) fits in the anti-rotation groove (104).

11. The anti-clogging pre-filter according to claim 10, characterized in that: The valve core (11) is provided with a pressure guide port (114) at a position 90° in the clockwise or counterclockwise direction of the outlet. The valve body (2) is provided with a pressure transmission port (205) connected to the valve cavity on the solid part at a 90° rotation position of the inlet end. A pressure gauge is connected to the pressure transmission port (205). or, The valve core (11) is provided with a pressure guide port (114) at a position of 90° in the clockwise and counterclockwise rotation direction of the outlet. The valve body (2) is provided with a pressure transmission port (205) connected to the valve cavity on the solid part at a 90° rotation position of the inlet end. A pressure gauge is installed on one of the pressure guide ports (114).

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