Pre-filter

Abstract

The utility model discloses a pre-filter which is applied to the technical field of pre-filters. Comprising a valve head, a filter bottle connected with a lower connector of the valve head, a filter element connected into the filter bottle, a sealing piece connected to a sewage draining exit of the filter bottle, a lower shell rotationally connected with the filter bottle, a transmission block axially and movably matched with the lower shell, and a transmission rod, wherein the lower end of the transmission rod is connected with the transmission block and moves synchronously with the transmission block; the flange is connected with the upper end of the transmission rod and moves synchronously with the upper end of the transmission rod, the transmission rod extends into a drainage channel of the sealing piece and is in sealed connection with the drainage channel during filtering, the lower shell rotates to drive the transmission block to rotate, the transmission block is in threaded connection with the sealing piece, and the sealing piece is in threaded connection with the transmission block. The sealing element is in threaded connection with the flange, and the piston at the lower part of the filter element is propped against the flange. According to the pre-filter, the transmission block and the transmission rod are matched with the sewage discharging and filtering states, so that the risk of water leakage is reduced, and the cost is saved.

Description

TECHNICAL FIELD

[0001] The utility model relates to prefilter technical field, in particular to a prefilter. BACKGROUND

[0002] The water supply pipeline of city is old and long, and the rust, silt and other impurities of pipeline can cause the control failure of water equipment, so the prefilter is usually installed on the household pipeline to improve the water quality and guarantee the water of rear.

[0003] The prefilter is the first rough filtration equipment of whole house water, can filter the silt, rust, large particle substance in tap water, prevents the harm of large amount of sediment impurities in city and community water supply pipe network to human body, and plays the positive preprotection role to the buried pipeline, faucet, water heating, water heater, boiler, central air conditioner, washing machine, dish washer, coffee machine and other water household appliances (water purifier, pure water machine, soft water machine) etc.

[0004] The existing laminated prefilter is rough, is used together with filter screen, the granular impurities are embedded in it and are difficult to clean or flush, and the cost is high and the process is many.

[0005] The existing prefilter basically discharges sewage through the ball valve, the ball valve is metal structure, cannot completely isolate the heavy metal ion precipitation problem in use process, the manufacturing cost is higher, the assembly process is more complex, the installation is more precise, is not assembled in place and is easy to cause the air leakage, freezing or high pressure environment under the sealing ring extrusion, and the installation is not in place and will cause the water leakage problem in later period.

[0006] In summary, how to effectively solve the problems such as high water leakage risk of existing prefilter, cannot completely isolate the heavy metal ion precipitation and the like is the urgent problem of the technical personnel in the field at present. UTILITY MODEL CONTENT

[0007] The utility model aims at providing a prefilter, the prefilter utilizes transmission block and transmission rod cooperation to discharge sewage and filter state, reduces the risk of water leakage and saves the cost.

[0008] To solve the above technical problem, the utility model provides the following technical scheme:

[0009] A pre-filter comprises a valve head, a filter bottle connected with the lower interface of the valve head, a filter core connected in the filter bottle, a sealing element connected at the blowdown port of the filter bottle, a lower shell rotatably connected with the filter bottle, a transmission block axially movably connected with the lower shell, a transmission rod with its lower end connected with the transmission block and synchronous movement, a flange connected with the upper end of the transmission rod and synchronous movement, the transmission rod extends in the blowdown channel of the sealing element and is sealingly connected with the blowdown channel during filtration, the lower shell rotates to drive the transmission block to rotate, the transmission block is connected with the sealing element through threads, the sealing element is connected with the flange through threads, and the lower piston of the filter core abuts against the flange.

[0010] Preferably, the inner thread of the transmission block is threadedly connected with the outer thread of the sealing element, the inner thread of the sealing element is threadedly connected with the outer thread of the flange, and the outer thread of the sealing element and the outer thread of the flange are opposite in rotation direction.

[0011] Preferably, the outer wall of the transmission block is provided with vertical ribs, the inner wall of the lower shell is provided with a sliding groove, the vertical ribs are connected in the sliding groove, and the vertical ribs and the sliding groove are slidingly connected.

[0012] Preferably, it further comprises a fixing element, the lower end of the transmission rod is provided with a square protruding rib, the fixing element is provided with a square hole, the square protruding rib of the transmission rod is inserted into the square hole of the fixing element, and the side wall of the fixing element and the inner wall of the transmission block are provided with vertical insertion holes and insertion blocks matched with each other.

[0013] Preferably, it further comprises a locking nut, the lower end of the transmission rod is provided with an outer thread, the locking nut is connected with the outer thread of the transmission rod, the locking nut presses the lower end surface of the fixing element, and the upper end surface of the fixing element abuts against the inner annular rib of the transmission block.

[0014] Preferably, the square hole is arranged at the center of the fixing element, the outer periphery of the fixing element is provided with a plurality of through holes communicated with the blowdown channel, the inner wall of the lower end of the through hole is lower than the outer wall, the locking nut abuts against the lower end surface of the inner wall, and the outer diameter of the locking nut is smaller than the inner diameter of the through hole away from the center.

[0015] Preferably, the lower end of the transmission block is provided with an inner thread, the upper end of the quick connector is provided with an outer thread matched with the inner thread of the transmission block, the height of the locking nut is smaller than the height difference between the outer wall and the inner wall of the fixing element, and the upper end surface of the quick connector abuts against the lower end surface of the outer wall of the fixing element.

[0016] Preferably, the upper end of the transmission rod is provided with a polygonal rod, the flange is provided with a polygonal groove, and the polygonal rod of the transmission rod is connected in the polygonal groove of the flange.

[0017] Preferably, the upper part of the side wall of the transmission rod is provided with an annular groove, and a sealing ring is installed in the annular groove to seal the gap of the drain hole of the sealing element.

[0018] Preferably, it further includes a retaining ring and a lower cover, the retaining ring being connected to the sealing element, the lower cover being fitted over the outer end of the filter bottle and fixedly connected to the retaining ring, and the lower cover being snapped into the lower housing.

[0019] The beneficial effects of this utility model are that the sealing element is connected to the drain port of the filter bottle, and the transmission rod extends into the drain channel of the sealing element. During filtration, the transmission rod and the drain channel of the sealing element maintain a sealed connection to ensure filtration efficiency. During backwashing, the drain channel of the transmission rod and the sealing element are opened, and impurities can be discharged through the drain channel.

[0020] The lower housing is rotatably connected to the filter bottle, and the rotation of the lower housing drives the transmission block to rotate. The transmission block is axially movable with the lower housing, and the transmission block is threadedly connected to the seal to realize the filter's sewage discharge and backwashing functions. The lower end of the transmission rod is connected to the transmission block and moves synchronously, while the upper end is connected to the flange and moves synchronously. The flange is threadedly connected to the seal.

[0021] When the lower housing rotates, the transmission block follows the rotation of the lower housing. The transmission block moves vertically relative to the lower housing and rotates relative to the sealing element, driving the transmission rod to move synchronously. The flange follows the movement of the transmission rod, moving vertically and rotating relative to the sealing element, thus achieving axial up-and-down movement of the flange. When the flange moves downward, its upper end abuts against the piston. At this time, the piston loses the abutting force and moves downward, and the discs spread out, entering the flushing mode. When the flange moves upward, its upper end abuts against the piston, at which time the discs are pressed together, and the filter is filtered by the disc filter element.

[0022] The pre-filter provided by this utility model allows raw water to enter through the valve inlet during filtration. The filtered water is then filtered by the disc filter element, reaching the interior of the filter element before being delivered to the downstream end of the water supply through the outlet. During wastewater discharge, the lower housing rotates in a set direction, causing the transmission block and transmission shaft to move, which in turn moves the flange downwards. This allows the filter element to enter a reverse flushing process, where the discs axially disperse, and water flows from the inside out through the oblique holes of the inner frame, simultaneously causing the discs to rotate. Dirt, impurities, and sludge are quickly flushed out and finally discharged. This pre-filter eliminates the ball valve structure, utilizing the transmission block and transmission rod in conjunction with the wastewater discharge and filtration processes. This reduces the risk of leakage and saves costs. Furthermore, since the transmission block and transmission rod are not made of metal, the problem of heavy metal leaching is avoided at the source. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 A schematic diagram of the structure of a pre-filter provided in a specific embodiment of this utility model;

[0025] Figure 2 for Figure 1 Schematic diagram of the central skeleton;

[0026] Figure 3 for Figure 1 Schematic diagram of the central rod;

[0027] Figure 4 for Figure 1 Schematic diagram of the middle and lower shell structure;

[0028] Figure 5 for Figure 1 Schematic diagram of the middle fixing component;

[0029] Figure 6 for Figure 1 Schematic diagram of the middle transmission block;

[0030] Figure 7 for Figure 1 Schematic diagram of the transmission rod;

[0031] Figure 8 for Figure 1 Schematic diagram of the middle sealing component;

[0032] Figure 9 for Figure 1 Schematic diagram of the structure of the middle flange;

[0033] Figure 10 This is a schematic diagram showing the filtering state of the pre-filter;

[0034] Figure 11 This is a schematic diagram of the pre-filter in backwashing mode.

[0035] Figure label:

[0036] 1. Valve head; 2. Frame; 3. Center rod; 4. Filter bottle; 5. Stacked discs; 6. Spring; 7. Lower cover; 8. Lower housing; 9. Fixing part; 10. Quick connector; 11. Locking nut; 12. Transmission block; 13. Transmission rod; 14. Snap ring; 15. Seal; 16. Flange; 17. Piston; 18. Pressure gauge; 19. Outer edge protrusion (201); 201. Snap fastener; 802. Slide groove; 901. Square hole; 1201. Internal thread; 1202. Internal thread; 1203. Annular rib; 1204. Vertical rib; 1301. Annular groove; 1302. Polygonal rod; 1303. Square protrusion; 1304. External thread; 1304. Drain hole; 1501. Annular groove; 1502. Lower annular groove; 1503. External thread; 1504. Internal thread; 1505. Polygonal groove; 1601. External thread; 1602. Detailed Implementation

[0037] The core of this invention is to provide a pre-filter that utilizes a transmission block and a transmission rod to coordinate sewage discharge and filtration, thereby reducing the risk of leakage and saving costs.

[0038] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0039] Please refer to Figures 1 to 11 This is a schematic diagram of the structure of a pre-filter and its components provided in a specific embodiment of this utility model.

[0040] In one specific embodiment, the pre-filter provided by this utility model includes a valve head 1, a filter bottle 4 connected to the lower interface of the valve head 1, a filter element connected inside the filter bottle 4, a sealing element 15 connected to the drain port of the filter bottle 4, a lower housing 8 rotatably connected to the filter bottle 4, a transmission block 12 axially movable in cooperation with the lower housing 8, a transmission rod 13 whose lower end is connected to the transmission block 12 and moves synchronously, and a flange 16 connected to the upper end of the transmission rod 13 and moves synchronously. The transmission rod 13 extends into the drain channel of the sealing element 15 and is sealed to the drain channel during filtration. The rotation of the lower housing 8 drives the transmission block 12 to rotate. The transmission block 12 is threadedly connected to the sealing element 15, and the sealing element 15 is threadedly connected to the flange 16. The piston 17 at the lower part of the filter element abuts against the flange 16. It also includes a reset element for quickly opening the piston 17 during backwashing.

[0041] In the above structure, a pre-filter is a water treatment and purification device whose main function is to remove impurities and particulate matter from the water before it enters the pipeline system, in order to protect the pipelines, pumps and other water treatment equipment.

[0042] The pre-filter includes a valve head 1, a filter bottle 4, a filter element, a seal 15, a lower housing 8, a transmission block 12, a transmission rod 13, and a flange 16. The filter bottle 4 receives filtered water and has internal threads for connection to the filter element assembly and threads for connection to the valve head 1. The internal thread of the valve head 1 engages with the external thread on the filter bottle 4, pressing against the sealing ring installed in the groove of the filter bottle 4 to form a seal, preventing water from flowing out of the filter bottle 4 through the gap between the two threads. The left side of the valve head 1 is the inlet, and the right side is the outlet; the diameter of the inlet is equal to the diameter of the outlet. A lead-resistant insert is welded to the inner wall of the valve head 1. The insert can be directly injection molded onto the inner wall of the valve head 1 to prevent heavy metal leaching.

[0043] The filter element is installed inside the filter bottle 4. The filter element includes a frame 2 connected inside the filter bottle 4, stacked plates 5 fitted onto the outer wall of the frame 2, a central rod 3 connected to the lower end of the frame 2, and a piston 17 connected to the lower end of the central rod 3. A protrusion 201 on the outer edge of the top of the frame 2 engages with a groove in the filter bottle 4 to prevent the frame 2 from moving downwards. Preferably, scale-inhibiting filter media can be placed inside the frame 2 to prevent scaling. Several neatly arranged stacked plates 5 fit onto the outer wall of the frame 2, forming a filter screen with a specific pore size to filter out small particles and suspended solids in the water, such as silt and rust. A high-quality filter element has high filtration accuracy and water flow performance, effectively removing fine impurities from the water and providing a clean water source.

[0044] The frame 2 is axially movable to the central rod 3. The internal thread of the piston 17 is connected to the thread of the central rod 3, which can drive the central rod 3 to move up and down axially. During the up and down movement, the filtration and backwashing modes can be switched. The outer annular edge of the piston 17 abuts against the bottom of the stacked discs 5. During filtration, the stacked discs 5 are pressed tightly. During backwashing, the piston 17 moves downward and the stacked discs 5 are dispersed. The reset element can be a spring 6, which is set between the lower end of the frame 2 and the upper end of the piston 17. During backwashing, it is used to quickly open the piston 17 to ensure the backwashing effect of the filter. The pressure gauge 18 is installed on the top of the valve head 1. The pressure gauge 18 is connected to the internal water supply and can detect the water pressure inside the filter bottle 4.

[0045] During use, water flows from the inlet of valve head 1 into the gap between filter bottle 4 and filter element, and after filtration, it flows into the center of filter element, and then from the center of filter element to the outlet of valve head 1.

[0046] The sealing element 15 is connected to the drain port of the filter bottle 4. A sealing ring is installed in the annular groove 1502 of the sealing element to seal the gap between it and the bottle body. The drive rod 13 extends into the drain channel of the sealing element 15. During filtration, the drive rod 13 and the drain channel of the sealing element 15 maintain a sealed connection to ensure filtration efficiency. During backwashing, the drive rod 13 and the drain channel of the sealing element 15 are opened, and impurities can be discharged through the drain channel.

[0047] The lower housing 8 is rotatably connected to the filter bottle 4. The rotation of the lower housing 8 drives the transmission block 12 to rotate. The transmission block 12 is axially movable with the lower housing 8. The transmission block 12 is threadedly connected to the seal 15 to realize the filter's sewage discharge and backwashing functions. The lower end of the transmission rod 13 is connected to the transmission block 12 and moves synchronously, while the upper end is connected to the flange 16 and moves synchronously. The flange 16 is threadedly connected to the seal 15.

[0048] When the lower housing 8 rotates, the transmission block 12 rotates with it. The transmission block 12 moves vertically relative to the lower housing 8 and rotates relative to the seal 15, driving the transmission rod 13 to move synchronously. The flange 16 moves with the transmission rod 13, moving vertically and rotating relative to the seal 15, thus achieving axial up-and-down movement of the flange 16. When the flange 16 moves downwards, its upper end abuts against the piston 17. At this time, the piston 17 loses its abutting force and moves downwards, causing the stacked discs 5 to disperse and enter the flushing mode. When the flange 16 moves upwards, its upper end abuts against the piston 17, pressing the stacked discs 5, which then filter the contents.

[0049] The pre-filter provided by this utility model allows source water to enter through the inlet of valve head 1 during filtration. The filtered water is then filtered by the filter element stacked on discs 5, and the purified water reaches the interior of the filter element before being delivered to the downstream end of the water supply through the outlet. During wastewater discharge, the lower housing 8 is rotated in a set direction. The lower housing 8 drives the transmission block 12 and the transmission shaft to move, causing the flange 16 to move downwards. The filter element enters a reverse flushing process, causing the discs 5 to axially disperse. Water flows from the inside out through the oblique holes of the inner frame 2, flushing and rotating the discs 5. Dirt, impurities, and sludge are quickly flushed out and finally discharged. The pre-filter eliminates the ball valve structure, utilizing the transmission block 12 and transmission rod 13 in conjunction with the wastewater discharge and filtration states. This reduces the risk of leakage and saves costs. Furthermore, since the transmission block 12 and transmission rod 13 are not made of metal, the problem of heavy metal leaching is avoided at the source.

[0050] Based on the above specific embodiments, the internal thread 1202 of the transmission block 12 is threadedly connected to the external thread 1504 of the seal 15, the internal thread 1505 of the seal 15 is threadedly connected to the external thread 1602 of the flange 16, and the external thread 1504 of the seal 15 and the external thread 1602 of the flange 16 have opposite directions of rotation.

[0051] In one specific embodiment, the internal thread 1202 at the upper end of the transmission block 12 engages with the external thread 1504 of the seal 15, and the internal thread 1505 of the seal 15 engages with the external thread 1602 of the flange 16. The external thread 1504 is a positive thread, and the external thread 1602 of the flange 16 is a negative thread. When the transmission rod 13 drives the flange 16 to rotate to the right, the flange 16 moves downward and its upper end abuts against the piston 17. At this time, the piston 17 loses the abutting force and moves downward, and the stacked plates 5 disperse and enter the flushing mode. Conversely, when the transmission rod 13 moves to the left, the flange 16 rises and presses the stacked plates 5.

[0052] The transmission rod 13 and the sewage discharge channel of the seal 15 are sealed by a sealing ring and a sealing gasket. When the external thread 1504 of the seal 15 and the external thread 1602 of the flange 16 rotate in opposite directions, the transmission rod 13 and the flange 16 move in opposite directions. At this time, the sealing ring and the sealing gasket are squeezed downwards, which is consistent with the flow direction of clean water. The sealing ring and the sealing gasket are in a compressed state under the pressure of water, resulting in better sealing.

[0053] Of course, the movement direction of the transmission rod 13 and the flange 16 can also be the same. In this case, the sealing ring and the sealing gasket need to be pressed upward, which is opposite to the flow direction of the clean water. The sealing ring and the sealing gasket between the transmission rod 13 and the sewage channel of the sealing element 15 require a large pre-tightening force to ensure the sealing performance.

[0054] Based on the above specific embodiments, the outer wall of the transmission block 12 is provided with a vertical rib 1204, and the inner wall of the lower housing 8 is provided with a sliding groove 802. The vertical rib 1204 is connected in the sliding groove 802, and the vertical rib 1204 and the sliding groove 802 are in sliding fit.

[0055] In one specific embodiment, the vertical ribs 1204 on the outer wall of the transmission block 12 serve as guides and supports, which can increase the strength of the transmission block 12. At the same time, they act as sliding guides to ensure that the movement trajectory of the transmission block 12 within the lower housing 8 is accurate.

[0056] The sliding groove 802 on the inner wall of the lower housing 8 cooperates with the vertical rib 1204, so that rotating the lower housing 8 can drive the transmission block 12 to rotate, thereby driving the transmission block 12 to move upward and downward in accordance with the teeth.

[0057] The chute 802 provides a sliding path for the vertical rib 1204. The shape and size of the chute 802 and the vertical rib 1204 are matched to ensure a smooth sliding fit between them. The sliding fit between the vertical rib 1204 and the chute 802 allows the transmission block 12 to move freely within the lower housing 8, enabling the backwashing function of the filter. During backwashing, the movement of the transmission block 12 drives the movement of the flange 16, thereby cleaning the filter element, removing impurities adhering to the filter element, and restoring the filter's filtration efficiency.

[0058] Based on the above specific embodiments, a fixing member 9 is also included. The lower end of the transmission rod 13 is provided with a square protrusion 1303. The fixing member 9 is provided with a square hole 901. The square protrusion 1303 of the transmission rod 13 is inserted into the square hole 901 of the fixing member 9. The side wall of the fixing member 9 and the inner wall of the transmission block 12 are provided with matching vertical insertion holes and insertion blocks.

[0059] In one specific embodiment, the internal square hole 901 of the fixing member 9 is engaged with the square protrusion 1303 of the transmission rod 13 to ensure that the transmission rod 13 and the fixing member 9 are circumferentially fixed and rotate synchronously, so that the fixing member 9 and the transmission rod 13 can stably transmit force.

[0060] The vertical insertion holes on the side wall of the fixing member 9 and the inner wall of the transmission block 12 mate with the insertion blocks to achieve a fixed connection between the fixing member 9 and the transmission block 12. The vertical insertion holes provide a guiding and positioning function, and the insertion blocks can be inserted into these holes to fix or guide the movement of the transmission block 12.

[0061] The precise positioning and fixation of the transmission rod 13 between the fixed part 9 and the transmission block 12 are achieved through the cooperation of the square protrusion 1303 and the square hole 901, as well as the cooperation of the vertical insertion hole and the insertion block, ensuring the stability and reliability of the mechanical system.

[0062] Based on the above specific embodiments, a locking nut 11 is also included. The lower end of the transmission rod 13 is provided with an external thread 1304. The locking nut 11 is connected to the external thread 1304 of the transmission rod 13. The locking nut 11 presses against the lower end face of the fixing member 9. The upper end face of the fixing member 9 abuts against the internal annular rib 1203 of the transmission block 12.

[0063] In one specific embodiment, the internal thread of the locking nut 11 engages with the external thread 1304 of the transmission rod 13. By rotating the locking nut 11, the locking nut 11 is fastened to the external thread 1304 of the transmission rod 13, thus fixing the fastener 99.

[0064] The locking nut 11 fixes the position of the transmission rod 13 by pressing the lower end face of the fixing member 9. The pressing can prevent the transmission rod 13 from shifting or loosening during operation, thus ensuring the stability and reliability of the transmission system.

[0065] Meanwhile, the transmission block 12 is provided with annular ribs 1203 inside. The upper end face of the fixing member 9 abuts against the annular ribs 1203 inside the transmission block 12, providing additional support and fixing, enhancing the connection strength between the fixing member 9 and the transmission block 12, and ensuring that the fixing member 9 is fixed in position in the transmission block 12.

[0066] The engagement of the external thread 1304 and the locking nut 11, as well as the engagement of the fixing member 9 and the internal annular rib 1203 of the transmission block 12, provides fixation and support in multiple directions, thereby enhancing the stability and reliability of the entire mechanical structure and realizing the precise positioning and fixation of the transmission rod 13 between the fixing member 9 and the transmission block 12.

[0067] Based on the above specific embodiments, the square hole 901 is located at the center of the fixing member 9, and the outer periphery of the fixing member 9 is provided with multiple through holes communicating with the sewage channel. The inner wall of the lower end of the through hole is lower than the outer wall, and the locking nut 11 abuts against the lower end surface of the inner wall. The outer diameter of the locking nut 11 is smaller than the inner diameter of the through hole on the side away from the center.

[0068] In one specific embodiment, the hole at the center of the fixing member 9 is a square hole 901, which is used to insert the square protrusion 1303 of the transmission rod 13 to achieve precise docking between the transmission rod 13 and the fixing member 9.

[0069] The outer periphery of the fastener 9 is provided with multiple through holes, which are connected to the drain channel to discharge impurities and dirt from the filter, helping to keep the inside of the filter clean and improve filtration efficiency.

[0070] The inner wall at the lower end of the through hole is lower than the outer wall, forming an inner cavity at the inner wall of the fastener 9. The locking nut 11 abuts against the lower end face of the inner wall of the through hole and is housed in the inner cavity. The locking nut 11 does not increase the overall size, resulting in a compact structure.

[0071] The locking nut 11 is fixed in position by abutting against the lower end face of the inner wall of the through hole, ensuring that the locking nut 11 is stable in the fixing member 9 and preventing displacement when pressure changes or vibrations occur.

[0072] The outer diameter of the locking nut 11 is smaller than the inner diameter of the through hole on the side furthest from the center. The locking nut 11 does not affect the unobstructed flow of the through hole, providing sufficient space for the sewage discharge channel, enabling effective sewage discharge and maintaining the cleanliness and efficient operation of the filter. At the same time, the locking nut 11 can rotate freely inside the through hole without interfering with the outer wall of the through hole, reducing friction and making the locking nut 11 easier to tighten and loosen.

[0073] Based on the above specific embodiments, the lower end of the transmission block 12 is provided with internal thread 1201, the upper end of the quick connector 10 is engaged with the internal thread 1201 of the transmission block 12, the height of the locking nut 11 is less than the height difference between the outer wall and the inner wall of the fixing member 9, and the upper end face of the quick connector 10 abuts against the lower end face of the outer wall of the fixing member 9.

[0074] In one specific embodiment, the upper external thread of the quick-connect 10 is threadedly connected to the internal thread 1201 of the transmission block 12, achieving a quick and secure connection. A drain pipe can be directly inserted into the bottom of the quick-connect 10 for convenient use. The height of the locking nut 11 is less than the height difference between the outer and inner walls of the fixing member 9, meaning that after installation, the locking nut 11 will not interfere with the lower end face of the outer wall of the fixing member 9, providing installation space for the locking nut 11.

[0075] The upper end face of quick connector 10 can abut against the lower end face of the outer wall of fastener 9, providing additional support and fixation for quick connector 10 and fastener 9, ensuring that quick connector 10 is fixed in position in fastener 9, and enhancing the stability of the structure.

[0076] Based on the above specific embodiments, the upper end of the transmission rod 13 is provided with a polygonal rod 1302, and the flange 16 is provided with a polygonal groove 1601. The polygonal rod 1302 of the transmission rod 13 is connected to the polygonal groove 1601 of the flange 16.

[0077] In one specific embodiment, the upper end of the transmission rod 13 is designed in a polygonal shape, which provides a larger contact area than a circle, thereby providing higher strength and torsional resistance at the connection. The flange 16 has a polygonal groove 1601 that matches the shape of the polygonal rod 1302, for receiving the polygonal rod 1302 of the transmission rod 13, ensuring a precise fit and stable connection between the transmission rod 13 and the flange 16. The polygonal rod 1302 at the upper end of the transmission rod 13 mates with the polygonal groove 1601 of the flange 16, typically achieved through insertion and fixing. Due to its large contact area and shape stability, the polygonal connection can transmit high torque. The polygonal connection can not only transmit torque but also effectively resist rotational and axial forces. Simultaneously, the polygonal shape can evenly distribute the load, reducing stress concentration at the connection.

[0078] Based on the above specific embodiments, an annular groove 1301 is provided on the upper part of the side wall of the transmission rod 13, and a sealing ring is installed in the annular groove 1301 to seal the gap of the drain hole 1501 of the sealing member 15.

[0079] In one specific embodiment, the drain hole 1501 is an opening in the drain channel on the seal 15, used to discharge impurities and dirt from the filter or other equipment. The function of the sealing ring is to ensure that contaminants can be discharged from the drain hole 1501 during the draining process; during filtration, the sealing ring seals the drain hole 1501 to prevent clean water from crossing with impurities. For example, when the transmission block 12 rotates to the right, it can drive the transmission rod 13 to rotate upward, and the drain hole 1501 will be opened at this time; conversely, it will be closed.

[0080] Based on the above specific embodiments, it also includes a retaining ring 14 and a lower cover 7. The retaining ring 14 is connected to the sealing member 15, the lower cover 7 is fitted onto the outer end of the filter bottle 4 and is fixedly connected to the retaining ring 14, and the lower cover 7 is snapped into the lower housing 8.

[0081] In one specific embodiment, the lower cover 7 is fitted over the outer ends of the filter bottle 4 and the sealing member 15, and finally, a retaining ring 14 is fitted into the lower annular groove 1503 of the sealing member 15 to fix the lower cover 7. The lower end of the lower cover 7 has a buckle, which engages with the buckle 801 of the lower housing 8 to connect the lower housing 8 and the filter bottle 4, making the connection convenient.

[0082] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0083] The pre-filter provided by this utility model has been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this utility model. The descriptions of the embodiments above are only for the purpose of helping to understand the method and core ideas of this utility model. It should be noted that those skilled in the art can make various improvements and modifications to this utility model without departing from its principles, and these improvements and modifications also fall within the protection scope of the claims of this utility model. Therefore, this utility model is not limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A pre-filter, characterized in that, The filter includes a valve head (1), a filter bottle (4) connected to the lower interface of the valve head (1), a filter element connected inside the filter bottle (4), a seal (15) connected to the drain port of the filter bottle (4), a lower housing (8) rotatably connected to the filter bottle (4), a transmission block (12) axially movable with the lower housing (8), a transmission rod (13) whose lower end is connected to the transmission block (12) and moves synchronously, and a flange (16) connected to the upper end of the transmission rod (13) and moves synchronously. The transmission rod (13) extends into the drain channel of the seal (15) and is sealed to the drain channel during filtration. The rotation of the lower housing (8) drives the transmission block (12) to rotate. The transmission block (12) is threaded to the seal (15), and the seal (15) is threaded to the flange (16). The piston (17) at the lower part of the filter element abuts against the flange (16).

2. The pre-filter according to claim 1, characterized in that, The internal thread (1202) of the transmission block (12) is threadedly connected to the external thread (1504) of the seal (15), the internal thread (1505) of the seal (15) is threadedly connected to the external thread (1602) of the flange (16), and the external thread (1504) of the seal (15) and the external thread (1602) of the flange (16) have opposite directions of rotation.

3. The pre-filter according to claim 1, characterized in that, The outer wall of the transmission block (12) is provided with a vertical rib (1204), and the inner wall of the lower housing (8) is provided with a sliding groove (802). The vertical rib (1204) is connected in the sliding groove (802), and the vertical rib (1204) slides in cooperation with the sliding groove (802).

4. The pre-filter according to claim 1, characterized in that, It also includes a fixing member (9), the lower end of the transmission rod (13) is provided with a square protrusion (1303), the fixing member (9) is provided with a square hole (901), the square protrusion (1303) of the transmission rod (13) is inserted into the square hole (901) of the fixing member (9), and the side wall of the fixing member (9) and the inner wall of the transmission block (12) are provided with matching vertical insertion holes and insertion blocks.

5. The pre-filter according to claim 4, characterized in that, It also includes a locking nut (11), the lower end of the transmission rod (13) is provided with an external thread (1304), the locking nut (11) is connected to the external thread (1304) of the transmission rod (13), the locking nut (11) presses against the lower end face of the fixing member (9), and the upper end face of the fixing member (9) abuts against the internal annular rib (1203) of the transmission block (12).

6. The pre-filter according to claim 5, characterized in that, The square hole (901) is located at the center of the fixing member (9). The outer periphery of the fixing member (9) is provided with multiple through holes that communicate with the sewage channel. The inner wall of the lower end of the through hole is lower than the outer wall. The locking nut (11) abuts against the lower end face of the inner wall. The outer diameter of the locking nut (11) is smaller than the inner diameter of the through hole on the side away from the center.

7. The pre-filter according to claim 6, characterized in that, The lower end of the transmission block (12) is provided with internal threads (1201), and the upper end of the quick connector (10) has external threads that cooperate with the internal threads (1201) of the transmission block (12). The height of the locking nut (11) is less than the height difference between the outer wall and the inner wall of the fixing member (9). The upper end face of the quick connector (10) abuts against the lower end face of the outer wall of the fixing member (9).

8. The pre-filter according to claim 1, characterized in that, The upper end of the transmission rod (13) is provided with a polygonal rod (1302), and the flange (16) is provided with a polygonal groove (1601). The polygonal rod (1302) of the transmission rod (13) is connected to the polygonal groove (1601) of the flange (16).

9. The pre-filter according to claim 1, characterized in that, The upper part of the side wall of the transmission rod (13) is provided with an annular groove (1301), and a sealing ring is installed in the annular groove (1301) to seal the gap of the drain hole (1501) of the sealing element (15).

10. The pre-filter according to claim 1, characterized in that, It also includes a retaining ring (14) and a lower cover (7). The retaining ring (14) is connected to the sealing element (15). The lower cover (7) is fitted onto the outer end of the filter bottle (4) and is fixedly connected to the retaining ring (14). The lower cover (7) is snapped into the lower housing (8).

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