Y-shaped filtering device for heating and ventilation pipeline

Abstract

The invention discloses a Y-shaped filter device for heating and ventilation pipelines, and belongs to the field of filters, the Y-shaped filter device comprises a pipe body, a filter cartridge and a support seat, the pipe body is of a Y-shaped structure, the upper end of the filter cartridge is open and is mounted in a filter chamber, a rotating shaft is arranged in the filter cartridge, the rotating shaft is fixedly connected with the filter cartridge through a plurality of connecting rods, and a paddle is arranged at the upper end of the rotating shaft; the lower end of the rotating shaft penetrates through the filter cartridge and is rotatably connected with the supporting seat through a bearing. The filter cartridge rotates in the filter chamber, so that each area in the circumferential direction of the filter cartridge is in uniform contact with a medium, and the problem of local blockage caused by concentrated accumulation of impurities in a traditional fixed filter cartridge is avoided; besides, in the rotating process of the filter cartridge, the washing direction of the medium to the surface of the filter cartridge is continuously changed along with the rotation of the filter cartridge, impurities are difficult to adhere and harden at a single position, the blocking period of the filter cartridge is effectively prolonged, long-term smoothness of a filter channel is ensured, and the stability of the filtering efficiency of the filter cartridge is improved; and the problems of system flow reduction, pressure loss increase and the like caused by blockage are reduced.

Description

Technical Field

[0001] This invention belongs to the field of filters, and specifically relates to a Y-type filter device for HVAC ducts. Background Technology

[0002] In urban heating and HVAC pipeline systems, media (such as hot water) are easily contaminated with mechanical impurities such as rust, sand, and solid particles during long-distance transport or circulation. If these impurities directly enter critical equipment or precision components such as pressure reducing valves, pressure relief valves, and level control valves, they can cause problems such as component wear, valve core jamming, and pipeline blockage, seriously affecting the operational stability of the equipment, shortening its service life, and even causing system failures leading to heating interruptions. Therefore, filtration devices have become an indispensable key component in pipeline systems.

[0003] Y-type filters are widely used in HVAC duct systems due to their compact structure, convenient installation, and low flow resistance loss. They are typically installed at the inlet of various functional valves or core equipment, serving as pre-filtration protection. Their working principle is as follows: the medium to be treated enters the Y-shaped body through the inlet, where impurities are intercepted by the built-in filter element (such as a stainless steel filter screen). The filtered clean medium is then transported downstream along the main flow channel, while the intercepted impurities are deposited in specific areas of the filter element, achieving the dual purpose of media purification and equipment protection.

[0004] A search revealed that CN112516677B discloses a Y-type filter, including a support base, an installation unit, a Y-shaped tube, a filter unit, and a connection unit. The support base is used to fix the Y-shaped tube through the installation unit. The filter unit is set on the left rear side inside the Y-shaped tube, and the left and right ends are connected to the external pipeline through the connection unit. Through a reasonable structural layout, it realizes the functions of media filtration and pipeline connection.

[0005] However, in practical applications, the installation position of the filter unit in the aforementioned existing technology and similar Y-type filter devices is fixed, and the medium can only flow through the filter element from a single direction. Impurities tend to accumulate in specific areas of the filter element, causing rapid blockage of the filter channel. This not only reduces filtration efficiency and flow capacity but also requires frequent shutdowns for cleaning, affecting the continuous operation of the system. Summary of the Invention

[0006] The purpose of this invention is to overcome the shortcomings of the prior art and provide a Y-type filter device for HVAC ducts to solve the problem that the filter element in the existing Y-type filter is prone to clogging in certain areas.

[0007] To achieve the above objectives, the technical solution adopted by the present invention is as follows: A Y-type filter device for HVAC ducts, comprising: The tube body has a Y-shaped structure, with a medium inlet at one end and a medium outlet at the other end, and a downwardly extending filter chamber between the medium inlet and the medium outlet. A filter cartridge, open at the top and installed inside a filter chamber, is used to filter impurities in the filter medium. The filter cartridge has a rotating shaft inside, which is fixedly connected to the filter cartridge by several connecting rods. The upper end of the rotating shaft is provided with blades. The support base is fixedly connected to the lower end of the filter chamber of the tube by bolts, and the lower end of the rotating shaft passes through the filter cylinder and is rotatably connected to the support base through a bearing.

[0008] Furthermore, the filter cartridge has a leakage hole at the bottom and a dirt storage chamber inside the support base. The upper end of the dirt storage chamber has a through hole that matches the leakage hole. When the filter cartridge rotates, the leakage hole and the through hole of the dirt storage chamber periodically align to form a communication channel, and impurities enter the dirt storage chamber through the leakage hole and the through hole.

[0009] Furthermore, the lower end of the support base is provided with a first drain hole, and an end cap is rotatably connected to one side of the support base. The end cap is provided with a second drain hole that cooperates with the first drain hole. When the first drain hole and the second drain hole are aligned, a drain channel is formed. When the drain hole and the through hole are aligned, the first drain hole and the second drain hole are offset. When the first drain hole and the second drain hole are aligned, the drain hole and the through hole are offset.

[0010] Furthermore, the end cap is provided with a rotating rod in the middle, and the rotating rod is connected to the end cap by a key. The upper end of the rotating rod is provided with a spline groove, and the lower end of the rotating shaft extends to the sludge storage cavity and is provided with a spline head that mates with the spline groove.

[0011] Furthermore, the lower end of the end cap is provided with a cylindrical pin, and the end of the rotating rod is provided with a pin hole that engages with the cylindrical pin. When draining sewage, after pressing the rotating rod upward, the cylindrical pin engages with the pin hole.

[0012] Furthermore, a third spring is sleeved on the outside of the rotating rod. One end of the third spring abuts against the end cap, and the other end abuts against the end of the rotating rod. The elastic force of the third spring is less than the frictional force after the cylindrical pin engages with the pin hole.

[0013] Furthermore, the filter cartridge is provided with a cleaning assembly, which includes at least one scraper. The upper end of the support base is provided with a boss that extends into the filter cartridge and is rotatably connected to the filter cartridge via a bearing. The rotating shaft is clearance-fitted with the boss. The lower end of the scraper is fixedly connected to the side wall of the boss via a connecting arm.

[0014] Furthermore, the rotating shaft adopts a reciprocating lead screw, and its outer circumferential surface is machined with reciprocating thread grooves that alternate between left-hand and right-hand threads. The rotating shaft is externally threaded with a reciprocating sleeve, one end of which is fixedly connected to a support arm. The end of the support arm away from the reciprocating sleeve is connected to a cleaning plate, and the scraping surface of the cleaning plate abuts against the scraping surface of the scraper.

[0015] Furthermore, a guide rod is fixedly connected to the connecting arm, and the support arm and the guide rod are in clearance fit.

[0016] Furthermore, the scraper has a guide groove on one side, which includes a vertical groove and a C-shaped groove that is continuously and smoothly connected to the vertical groove. The lower end of the C-shaped groove is an inclined groove, and the depth of the C-shaped groove gradually decreases from bottom to top. The cleaning plate has a slot on the side near the scraper, and a sleeve is provided in the slot. The sleeve and the slot are fitted with a clearance fit. One end of the sleeve is provided with a sliding rod that is fitted with the clearance fit. A second spring is sleeved on the outside of the sliding rod. One end of the second spring is fixedly connected to the sleeve, and the other end is fixedly connected to the inner wall of the cleaning plate.

[0017] The beneficial effects of this invention are: (1) The filter cartridge of the present invention rotates inside the filter chamber, so that the filter cartridge is in uniform contact with the medium in all circumferential areas, avoiding the problem of local blockage caused by the concentrated accumulation of impurities in traditional fixed filter cartridges; in addition, during the rotation of the filter cartridge, the scouring direction of the medium on the surface of the filter cartridge changes continuously with the rotation of the filter cartridge, making it difficult for impurities to adhere and clump in a single position, effectively extending the clogging cycle of the filter cartridge, ensuring the long-term unobstructed flow of the filtration channel, improving the stability of the filter cartridge filtration efficiency, and reducing problems such as reduced system flow rate and increased pressure loss caused by blockage.

[0018] (2) A leak hole is provided at the bottom of the filter cartridge and a through hole is provided at the top of the dirt storage chamber. When the filter cartridge rotates, the leak hole and the through hole of the dirt storage chamber are periodically aligned to form a communication channel. Impurities enter the dirt storage chamber through the leak hole and the through hole, thus avoiding impurities from being retained inside the filter cartridge.

[0019] (3) A first drain hole is provided at the lower end of the support base and a second drain hole is provided on the end cap. When the drain hole and the through hole are aligned, the first drain hole and the second drain hole are staggered. When the first drain hole and the second drain hole are aligned, the drain hole and the through hole are staggered. This avoids leakage of the medium inside the pipe during draining.

[0020] (4) A rotating rod is provided in the middle of the end cover. The rotating rod and the rotating shaft are detachably connected through the spline groove and the spline head. When sewage needs to be discharged, the rotating shaft is pushed upward so that the spline groove is sleeved outside the spline head. The rotating shaft is connected to the rotating rod and drives the rotating rod and the end cover to rotate together. During the rotation of the end cover, the first sewage hole and the second sewage hole are periodically aligned, realizing the periodic sewage discharge of the sewage storage chamber.

[0021] (5) By setting a cylindrical pin and a pin hole that engages with it, when draining sewage, after pressing the rotating rod upward, the cylindrical pin engages with the pin hole; this avoids the drawback of needing to manually press the rotating rod continuously during the sewage discharge process. After the operator completes the pressing and engaging, he / she can leave. The rotating shaft can continuously drive the end cover to rotate to achieve periodic sewage discharge, which greatly reduces the intensity of manual operation.

[0022] (6) By setting a third spring, the problem of the rotating rod accidentally moving upward and the spline mis-engaging caused by factors such as medium impact and device vibration during non-drainage periods is avoided, so that the first and second drain holes are always misaligned, and the problem of medium leakage in the sewage storage chamber due to accidental sewage discharge is avoided.

[0023] (7) A scraper is installed inside the filter cartridge. When the filter cartridge rotates, the scraper can scrape off the impurities attached to the inner wall of the filter cartridge in real time, so as to avoid the accumulation and blockage of impurities around the filter screen holes and ensure that the filter holes of the filter cartridge are always unobstructed. Compared with passive impurity removal that relies solely on centrifugal force, this active cleaning method can more thoroughly remove residual impurities on the surface of the filter screen, further improving the long-term stability of the filter cartridge filtration effect.

[0024] (8) The rotating shaft adopts a reciprocating screw, and a reciprocating sleeve is set on the outside of the rotating shaft. When the rotating shaft rotates, the reciprocating sleeve moves axially along the reciprocating thread groove, and then drives the cleaning plate to scrape up and down along the scraping surface of the scraper through the support arm, scraping away the impurities attached to the scraping surface of the scraper in real time, avoiding the accumulation and caking of impurities on the side wall of the scraper, and ensuring the efficient cleaning ability of the scraper.

[0025] (9) By setting a guide groove, when the cleaning plate moves downward to clean the scraper, the scraping surface of the cleaning plate abuts against the scraping surface of the scraper to clean the scraper; during the return of the cleaning plate, the slide rod is squeezed by the bottom of the C-shaped groove to push the cleaning plate away from the scraper, so that the cleaning plate and the scraper are separated, realizing the function of the cleaning plate scraping downward and separating upward. This not only reduces the friction when the cleaning plate returns, but also prevents the cleaning plate from carrying the impurities on the scraper upward. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the structure of a Y-type filter device for HVAC ducts according to the present invention.

[0027] Figure 2 This is a cross-sectional view of a Y-type filter device for HVAC ducts according to the present invention.

[0028] Figure 3 yes Figure 2 Enlarged view of point A in the middle.

[0029] Figure 4 yes Figure 2 Enlarged view of section B in the middle.

[0030] Figure 5 This is a schematic diagram of the support base.

[0031] Figure 6 This is a schematic diagram of the assembly of the end cap and the rotating rod.

[0032] Figure 7 This is a schematic diagram of the filter cartridge and cleaning components assembly.

[0033] Figure 8 This is a diagram of the cleanup components.

[0034] Figure 9 This is a schematic diagram of the scraper.

[0035] Figure 10 yes Figure 7 DD view in the middle.

[0036] In the diagram, 1. Pipe body; 2. Filter cartridge; 21. Rotating shaft; 22. Paddle; 23. Connecting rod; 24. Leakage hole; 25. Spline head; 3. Cleaning assembly; 31. Scraper; 32. Connecting arm; 33. Guide groove; 331. Vertical groove; 332. C-groove; 34. Cleaning plate; 35. Sleeve; 36. First spring; 37. Slide rod; 38. Second spring; 4. Reciprocating sleeve; 41. Support arm; 42. Guide rod; 5. Support base; 51. First drain hole; 52. Sludge storage chamber; 53. Through hole; 54. End cap; 55. Second drain hole; 56. Cylindrical pin; 6. Rotating rod; 61. Spline groove; 62. Third spring; 63. Pin hole. Detailed Implementation

[0037] The following will be combined with the appendix Figures 1-10 The technical solutions in the embodiments of the present invention are clearly and completely described herein. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0038] In the description of this invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this invention, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0039] like Figure 1 , Figure 2As shown, a Y-type filter device for HVAC ducts includes a pipe body 1, a filter cartridge 2, and a support base 5. The pipe body 1 has a Y-shaped structure, with a medium inlet at one end and a medium outlet at the other end. A downwardly extending filter chamber is provided between the medium inlet and the medium outlet. Figure 7 As shown, the filter cartridge 2 has an open top and is installed inside the filter chamber to filter impurities in the medium. The filter cartridge 2 has a rotating shaft 21 inside, which is fixedly connected to the filter cartridge 2 by several connecting rods 23. The upper end of the rotating shaft 21 is provided with a blade 22. The support base 5 is fixedly connected to the lower end of the filter chamber of the tube body 1 by bolts. The lower end of the rotating shaft 21 passes through the filter cartridge 2 and is rotatably connected to the support base 5 through a bearing.

[0040] In use, the medium enters the tube body 1 through the medium inlet and washes the impeller 22. The impeller 22 drives the rotating shaft 21 to rotate, which in turn drives the filter cartridge 2 to rotate. This ensures that the filter cartridge 2 is in uniform contact with the medium in all circumferential areas, avoiding the local clogging problem caused by the concentrated accumulation of impurities in traditional fixed filter cartridges 2. In addition, during the rotation of the filter cartridge 2, the direction of the medium washing the surface of the filter cartridge 2 changes continuously with the rotation of the filter cartridge 2. Impurities are difficult to adhere and clump in a single position, effectively extending the clogging cycle of the filter cartridge 2, ensuring that the filtration channel is unobstructed for a long time, improving the stability of the filtration efficiency of the filter cartridge 2, and reducing problems such as decreased system flow and increased pressure loss caused by clogging.

[0041] like Figure 2 As shown, the filter cartridge 2 has a leakage hole 24 at the bottom and a dirt storage chamber 52 inside the support base 5. The upper end of the dirt storage chamber 52 has a through hole 53 that cooperates with the leakage hole 24. When the filter cartridge 2 rotates, the leakage hole 24 and the through hole 53 of the dirt storage chamber 52 periodically align to form a communication channel. Impurities enter the dirt storage chamber 52 through the leakage hole 24 and the through hole 53, thus preventing impurities from being retained inside the filter cartridge 2.

[0042] like Figure 2 As shown, the lower end of the support base 5 is provided with a first drain hole 51, and an end cap 54 is rotatably connected to one side of the support base 5. The end cap 54 is provided with a second drain hole 55 that cooperates with the first drain hole 51. By rotating the end cap 54, when the first drain hole 51 and the second drain hole 55 are aligned, a drain channel is formed to discharge impurities in the sludge storage chamber 52. When the leakage hole 24 is aligned with the through hole 53, the first drain hole 51 and the second drain hole 55 are misaligned. When the first drain hole 51 and the second drain hole 55 are aligned, the leakage hole 24 and the through hole 53 are misaligned, thus preventing leakage of the medium inside the pipe body 1.

[0043] like Figure 2 , Figure 6 , Figure 7As shown, the end cap 54 has a rotating rod 6 in the middle. The rotating rod 6 is connected to the end cap 54 by a key, so that the rotating rod 6 can rotate synchronously with the end cap 54 and slide along its axial direction. The upper end of the rotating rod 6 is provided with a spline groove 61. The lower end of the rotating shaft 21 extends to the sludge storage chamber 52 and is provided with a spline head 25 that cooperates with the spline groove 61. When sludge needs to be discharged, the rotating shaft 21 is pushed upward so that the spline groove 61 is sleeved on the outside of the spline head 25. The rotating shaft 21 is connected to the rotating rod 6 and drives the rotating rod 6 and the end cap 54 to rotate together. During the rotation of the end cap 54, the first sludge discharge hole 51 and the second sludge discharge hole 55 are periodically aligned, realizing the periodic discharge of sludge from the sludge storage chamber 52.

[0044] like Figure 6 As shown, the lower end of the end cap 54 is provided with a cylindrical pin 56, and the end of the rotating rod 6 is provided with a pin hole 63 that engages with the cylindrical pin 56. When draining sewage, after pressing the rotating rod 6 upward, the cylindrical pin 56 engages with the pin hole 63. This avoids the drawback of needing to manually press the rotating rod 6 continuously during the sewage draining process. After the operator completes the pressing and engaging, they can leave. The rotating shaft 21 can continuously drive the end cap 54 to rotate to achieve periodic sewage draining, which greatly reduces the intensity of manual operation.

[0045] like Figure 6 As shown, a third spring 62 is sleeved on the outside of the rotating rod 6. One end of the third spring 62 abuts against the end cap 54, and the other end abuts against the end of the rotating rod 6. The elastic force of the third spring 62 is less than the friction force after the cylindrical pin 56 and the pin hole 63 are engaged. This avoids the problem of the rotating rod 6 accidentally moving upward or the spline mis-engaging due to factors such as medium impact and device vibration during non-drainage periods. It also ensures that the first and second drain holes 55 are always misaligned, thus preventing the problem of medium leakage in the sewage storage chamber 52 due to accidental sewage discharge.

[0046] like Figure 2 , Figure 7 As shown, the filter cartridge 2 is provided with a cleaning assembly 3 inside. The cleaning assembly 3 includes at least one scraper 31. The upper end of the support base 5 is provided with a boss, which extends into the interior of the filter cartridge 2 and is rotatably connected to the filter cartridge 2 through a bearing. The rotating shaft 21 is clearance-fitted with the boss. The lower end of the scraper 31 is fixedly connected to the side wall of the boss through a connecting arm 32.

[0047] In this design, when the filter cartridge 2 rotates, the scraper 31 is fixed to the upper end of the support base 5 and does not rotate with the filter cartridge 2. It forms a continuous relative friction with the inner wall of the rotating filter cartridge 2. The scraper 31 can scrape off the impurities (including stubborn hardened impurities and fine particle deposits) attached to the inner wall of the filter cartridge 2 in real time, avoiding the accumulation and blockage of impurities around the filter screen holes, and ensuring that the filter holes of the filter cartridge 2 are always unobstructed. Compared with passive impurity removal that relies solely on centrifugal force, this active cleaning method can more thoroughly remove residual impurities on the surface of the filter screen, further improving the long-term stability of the filtration effect of the filter cartridge 2.

[0048] like Figure 7 , Figure 8 As shown, the rotating shaft 21 adopts a reciprocating lead screw, and its outer circumferential surface is machined with reciprocating thread grooves that alternate between left-hand and right-hand threads. The rotating shaft 21 is externally threaded with a reciprocating sleeve 4. One end of the reciprocating sleeve 4 is fixedly connected to a support arm 41. The end of the support arm 41 away from the reciprocating sleeve 4 is connected to a cleaning plate 34. The scraping surface of the cleaning plate 34 abuts against the scraping surface of the scraper 31.

[0049] In this design, the rotating shaft 21 adopts a reciprocating screw structure. When the rotating shaft 21 rotates, the reciprocating sleeve 4 moves axially along the reciprocating thread groove, which in turn drives the cleaning plate 34 to scrape up and down along the scraping surface of the scraper 31 through the support arm 41, thereby scraping away the impurities attached to the scraping surface of the scraper 31 in real time, preventing impurities from accumulating and caking on the side wall of the scraper 31, and ensuring the efficient cleaning capability of the scraper 31.

[0050] like Figure 7 As shown, a guide rod 42 is fixedly connected to the connecting arm 32, and the support arm 41 is clearance-fitted with the guide rod 42 to provide rigid guiding constraint for the axial reciprocating motion of the reciprocating sleeve 4 driving the cleaning plate 34, so as to avoid the reciprocating sleeve 4 from radial displacement or torsion due to the helical force of the reciprocating thread groove, and ensure that the cleaning plate 34 and the scraping surface of the scraper 31 remain in contact, thereby ensuring the cleaning effect of the cleaning plate 34 on the scraper 31.

[0051] Furthermore, the scraper 31 has a guide groove 33 on one side, the guide groove 33 includes a vertical groove 331 and a C-shaped groove 332 that is continuously and smoothly connected to the vertical groove 331. The lower end of the C-shaped groove 332 is an inclined groove, and the depth of the C-shaped groove 332 gradually becomes shallower from bottom to top. The cleaning plate 34 has a slot on the side near the scraper 31, and a sleeve 35 is provided in the slot. The sleeve 35 is clearance-fitted with the slot. One end of the sleeve 35 is provided with a sliding rod 37 that is clearance-fitted with it. A second spring 38 is sleeved on the outside of the sliding rod 37. One end of the second spring 38 is fixedly connected to the sleeve 35, and the other end is fixedly connected to the inner wall of the cleaning plate 34.

[0052] like Figures 7-10As shown, when the cleaning plate 34 moves downward to clean the scraper 31, the sliding rod 37 is located in the vertical groove 331. At this time, the scraping surface of the cleaning plate 34 abuts against the scraping surface of the scraper 31. As the sliding rod 37 moves downward, the cleaning plate 34 cleans the scraper 31. When the cleaning plate 34 moves to the lower end of the scraper 31, the sliding rod 37 enters the interior of the C-shaped groove 332 along the inclined groove at the lower end of the C-shaped groove 332, and slides upward along the C-shaped groove 332 for a return stroke. During the return stroke of the cleaning plate 34, the sliding rod 37 is squeezed by the bottom of the groove in the C-shaped groove 332, pushing the cleaning plate 34... Push the cleaning plate 34 away from the scraper 31 to separate it from the scraper 31. When the cleaning plate 34 moves to the upper end of the scraper 31, the slide rod 37 moves to the upper end of the C-shaped groove 332. Under the action of the first spring 36, the slide rod 37 slides back into the vertical groove 331 along the upper end of the C-shaped groove 332. At this time, the cleaning plate 34 and the scraper 31 re-contact each other, realizing the function of the cleaning plate 34 scraping downwards and separating upwards. This not only reduces the friction of the cleaning plate 34 during the return stroke, but also prevents the cleaning plate 34 from carrying the impurities on the scraper 31 upwards.

[0053] The above description is merely an example and illustration of the structure of the present invention. Those skilled in the art can make various modifications or additions to the specific embodiments described or use similar methods to replace them, as long as they do not deviate from the scope defined by the structure of the present invention, they should all fall within the protection scope of the present invention.

Claims

1. A Y-type filter device for HVAC ducts, comprising: The tube body (1) has a Y-shaped structure, with a medium inlet at one end and a medium outlet at the other end, and a downwardly extending filter chamber between the medium inlet and the medium outlet. A filter cartridge (2) with an open top and installed inside a filter chamber for filtering impurities in a medium is characterized in that a rotating shaft (21) is provided inside the filter cartridge (2), and the rotating shaft (21) is fixedly connected to the filter cartridge (2) by several connecting rods (23), and a blade (22) is provided at the upper end of the rotating shaft (21). The support base (5) is fixedly connected to the lower end of the filter chamber of the tube body (1) by bolts. The lower end of the rotating shaft (21) passes through the filter cylinder (2) and is rotatably connected to the support base (5) through a bearing.

2. The Y-type filter device for HVAC ducts according to claim 1, characterized in that, The filter cartridge (2) has a leakage hole (24) at the bottom and a dirt storage chamber (52) inside the support base (5). The upper end of the dirt storage chamber (52) has a through hole (53) that matches the leakage hole (24). When the filter cartridge (2) rotates, the leakage hole (24) and the through hole (53) of the dirt storage chamber (52) periodically align to form a communication channel. Impurities enter the interior of the dirt storage chamber (52) through the leakage hole (24) and the through hole (53).

3. A Y-type filter device for HVAC ducts according to claim 2, characterized in that, The lower end of the support base (5) is provided with a first drain hole (51), and an end cap (54) is rotatably connected to one side of the support base (5). The end cap (54) is provided with a second drain hole (55) that cooperates with the first drain hole (51). When the first drain hole (51) and the second drain hole (55) are aligned, a drain channel is formed. When the drain hole (24) is aligned with the through hole (53), the first drain hole (51) and the second drain hole (55) are offset. When the first drain hole (51) and the second drain hole (55) are aligned, the drain hole (24) and the through hole (53) are offset.

4. A Y-type filter device for HVAC ducts according to claim 3, characterized in that, The end cap (54) is provided with a rotating rod (6) in the middle. The rotating rod (6) is connected to the end cap (54) by a key. The upper end of the rotating rod (6) is provided with a spline groove (61). The lower end of the rotating shaft (21) extends to the sludge storage chamber (52) and is provided with a spline head (25) that cooperates with the spline groove (61).

5. A Y-type filter device for HVAC ducts according to claim 4, characterized in that, The end cap (54) has a cylindrical pin (56) at its lower end, and the end of the rotating rod (6) has a pin hole (63) that engages with the cylindrical pin (56). When draining sewage, the cylindrical pin (56) engages with the pin hole (63) after the rotating rod (6) is pressed upward.

6. A Y-type filter device for HVAC ducts according to claim 5, characterized in that, A third spring (62) is sleeved on the outside of the rotating rod (6). One end of the third spring (62) abuts against the end cap (54), and the other end abuts against the end of the rotating rod (6). The elastic force of the third spring (62) is less than the friction force after the cylindrical pin (56) and the pin hole (63) are engaged.

7. A Y-type filter device for HVAC ducts according to any one of claims 1-6, characterized in that, The filter cartridge (2) is provided with a cleaning assembly (3), which includes at least one scraper (31). The upper end of the support base (5) is provided with a boss that extends into the filter cartridge (2) and is rotatably connected to the filter cartridge (2) through a bearing. The rotating shaft (21) is in clearance fit with the boss. The lower end of the scraper (31) is fixedly connected to the side wall of the boss through a connecting arm (32).

8. A Y-type filter device for HVAC ducts according to claim 7, characterized in that, The rotating shaft (21) is a reciprocating lead screw with a reciprocating thread groove that alternates between left-hand and right-hand threads on its outer circumference. The rotating shaft (21) is externally threaded with a reciprocating sleeve (4). One end of the reciprocating sleeve (4) is fixedly connected to a support arm (41). The end of the support arm (41) away from the reciprocating sleeve (4) is connected to a cleaning plate (34). The scraping surface of the cleaning plate (34) abuts against the scraping surface of the scraper (31).

9. A Y-type filter device for HVAC ducts according to claim 8, characterized in that, A guide rod (42) is fixedly connected to the connecting arm (32), and the support arm (41) is clearance-fitted with the guide rod (42).

10. A Y-type filter device for HVAC ducts according to claim 9, characterized in that, The scraper (31) has a guide groove (33) on one side. The guide groove (33) includes a vertical groove (331) and a C-shaped groove (332) that is continuously and smoothly connected to the vertical groove (331). The lower end of the C-shaped groove (332) is an inclined groove, and the depth of the C-shaped groove (332) gradually becomes shallower from bottom to top. The cleaning plate (34) has a slot on the side near the scraper (31). A sleeve (35) is provided in the slot. The sleeve (35) is clearance-fitted with the slot. One end of the sleeve (35) is provided with a sliding rod (37) that is clearance-fitted with it. A second spring (38) is sleeved on the outside of the sliding rod (37). One end of the second spring (38) is fixedly connected to the sleeve (35), and the other end is fixedly connected to the inner wall of the cleaning plate (34).

Images