A heating and plumbing duct filtering device

Abstract

The utility model discloses a kind of heating pipeline filtering devices, it is related to heating pipeline technical field, including detachably connected upper connecting sleeve and lower connecting sleeve, upper connecting sleeve is used to be set on the outside of upstream pipeline interface, the bottom of upper connecting sleeve is equipped with through hole, through hole is connected with communicating pipe, communicating pipe is inserted into the inside of lower connecting sleeve;Lower connecting sleeve is used to be embedded in the inside of downstream pipeline interface, the inside of lower connecting sleeve is equipped with first filter barrel and second filter barrel, first filter barrel is set on the periphery of communicating pipe, the bottom of first filter barrel is equipped with a plurality of first filter holes, second filter barrel is set on the periphery of first filter barrel bottom, the bottom of second filter barrel is equipped with a plurality of second filter holes, so that heating medium can sequentially pass through upstream pipeline interface, communicating pipe, first filter hole and second filter hole and flow into downstream pipeline interface.The utility model can fully purify impurities in heating medium, protect downstream equipment, and be convenient for maintenance.

Description

Technical Field

[0001] This utility model relates to the field of HVAC duct technology, and in particular to an HVAC duct filtration device. Background Technology

[0002] In the operation of HVAC systems, especially in scenarios with high requirements for equipment stability such as data centers, HVAC ducts, as the core channel for media transmission, directly affect the energy efficiency and safety of the entire HVAC system. Currently, existing HVAC ducts still have the following shortcomings in practical applications, which restrict the reliable operation of the system: On the one hand, existing HVAC ducts lack efficient and reasonable filtration structure designs, making it impossible to fully purify the circulating HVAC media. After long-term operation of the HVAC system, impurities such as metal shavings, welding slag, and scale particles easily mix into the media. These impurities flow with the media in the pipes, which not only reduces the media transmission efficiency but may also cause wear and blockage of downstream valves, compressors, and other critical components, leading to equipment failure and, in severe cases, even affecting the normal start-up and shutdown of the entire HVAC system.

[0003] On the other hand, although some HVAC ducts are equipped with simple filter components, these components are mostly fixed installations, making disassembly and assembly cumbersome and inconvenient for regular cleaning or replacement. Over time, accumulated impurities adhere to the filter surface, leading to a continuous decline in filtration efficiency. This further increases the resistance to medium flow within the ducts, affecting the heat exchange performance and operational stability of the HVAC system. Utility Model Content

[0004] To address one or more technical problems in the prior art, this utility model provides a HVAC duct filtration device, comprising a detachably connected upper connecting sleeve and a lower connecting sleeve: The upper connecting sleeve is used to be fitted on the outside of the upstream pipe interface. The bottom of the upper connecting sleeve is provided with a connecting hole, and a connecting pipe is connected through the connecting hole. The connecting pipe extends into the interior of the lower connecting sleeve. The lower connecting sleeve is used to be embedded inside the downstream pipe interface. The lower connecting sleeve is provided with a first filter barrel and a second filter barrel. The first filter barrel is sleeved around the outside of the connecting pipe. The bottom of the first filter barrel is provided with a plurality of first filter holes. The second filter barrel is sleeved around the bottom of the first filter barrel. The bottom of the second filter barrel is provided with a plurality of second filter holes, so that the heating and ventilation medium can flow into the downstream pipe interface in sequence through the upstream pipe interface, the connecting pipe, the first filter hole and the second filter hole.

[0005] Optionally, the bottom inner side of the upper connecting sleeve is provided with an annular ramp structure, and the upper end of the connecting hole is connected to the lower end of the annular ramp structure.

[0006] Optionally, the bottom inner side of the upper connecting sleeve is provided with a sealing groove for embedding a sealing ring, so that the bottom of the upstream pipe interface can abut against the sealing ring provided in the sealing groove.

[0007] Optionally, the first filter hole is connected to an external pipe, so that the heating and ventilation medium can flow into the downstream pipe interface in sequence through the upstream pipe interface, the connecting pipe, the first filter hole, the external pipe and the second filter hole.

[0008] Optionally, the top of the first filter barrel is threadedly connected to the bottom of the upper connecting sleeve.

[0009] Optionally, the top of the second filter barrel is threadedly connected to the bottom of the upper connecting sleeve.

[0010] Optionally, a drain groove is designed on the top outer side of the upper connecting sleeve, and a drain pipe is connected through the bottom of the drain groove.

[0011] Optionally, the second filter canister is filled with filter media.

[0012] Optionally, a fixing rod is detachably connected to the side wall of the first filter barrel, and a first hook is connected to the fixing rod through a connecting plate. The inner wall of the second filter barrel is provided with a hanging ring that cooperates with the first hook. The second filter barrel is sleeved on the outer periphery of the bottom of the first filter barrel through the cooperation of the hanging ring and the first hook.

[0013] Optionally, the outer wall of the connecting pipe is connected to a connecting cylinder, and the fixing rod passes through the side wall of the first filter barrel and is connected to the inner wall of the connecting cylinder.

[0014] The beneficial effects of this utility model are: This invention features a dual-filter gradient filtration structure, which effectively purifies impurities in HVAC media and protects downstream equipment. The detachable design of the upper and lower connecting sleeves and filter barrels facilitates maintenance. Attached Figure Description

[0015] The accompanying drawings are provided to further understand the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention and do not constitute a limitation thereof.

[0016] Figure 1 This is a schematic diagram of the external structure of the filtration device according to an embodiment of the present utility model. Figure 1 ; Figure 2 This is a schematic diagram of the external structure of the filtration device according to an embodiment of the present utility model. Figure 2 ; Figure 3This is a schematic diagram of the external structure of the filtration device according to an embodiment of the present utility model. Figure 3 ; Figure 4 This is a schematic diagram of the external structure of the filtration device according to an embodiment of the present utility model. Figure 4 ; Figure 5 This is a schematic diagram of the external structure of the filtration device according to an embodiment of the present utility model. Figure 5 ; Figure 6 This is a schematic diagram of the internal structure of the filtration device according to an embodiment of the present utility model. Figure 1 ; Figure 7 This is a schematic diagram of the internal structure of the filtration device according to an embodiment of the present utility model. Figure 2 ; Figure 8 This is a schematic diagram of the connection between the filter device and the HVAC duct according to an embodiment of the present utility model; Figure 9 yes Figure 8 Enlarged view of point A in the middle; Figure 10 This is a schematic diagram of the internal structure of the lower connecting sleeve according to an embodiment of the present utility model. Figure 1 ; Figure 11 This is a schematic diagram of the internal structure of the lower connecting sleeve according to an embodiment of the present utility model. Figure 2 ; Figure 12 This is a schematic diagram of the internal structure of the second filter barrel according to an embodiment of the present utility model. Figure 1 ; Figure 13 This is a schematic diagram of the internal structure of the second filter barrel according to an embodiment of the present utility model. Figure 2 ; Figure 14 This is a schematic diagram of the internal structure of the first filter barrel according to an embodiment of the present utility model. Figure 1 ; Figure 15 This is a schematic diagram of the internal structure of the first filter barrel according to an embodiment of the present utility model. Figure 2 ; Figure 16 This is a schematic diagram of the internal structure of the lower connecting sleeve according to an embodiment of the present utility model. Figure 3 ; Figure 17 This is a schematic diagram of the internal structure of the lower connecting sleeve according to an embodiment of the present utility model. Figure 4 ; Figure 18 This is a schematic diagram of the internal structure of the second filter barrel according to an embodiment of the present utility model. Figure 3 ; Figure 19This is a schematic diagram of the internal structure of the second filter barrel according to an embodiment of the present utility model. Figure 4 ; Figure 20 This is a schematic diagram of the internal structure of the first filter barrel according to an embodiment of the present utility model. Figure 3 ; Figure 21 This is a schematic diagram of the internal structure of the first filter barrel according to an embodiment of the present utility model. Figure 4 ; Figure 22 This is a schematic diagram of the internal structure of the first filter barrel according to an embodiment of the present utility model. Figure 5 ; Figure 23 This is a schematic diagram of the internal structure of the first filter barrel according to an embodiment of the present utility model. Figure 6 .

[0017] In the picture: 1. Upper connecting sleeve; 11. Connecting hole; 12. Connecting pipe; 13. Annular ramp structure; 14. Sealing groove; 15. Drainage groove; 16. Drainage pipe; 17. Connecting cylinder; 2. Lower connecting sleeve; 21. First filter barrel; 211. First filter hole; 212. External connecting pipe; 22. Second filter barrel; 221. Second filter hole; 222. Filter packing; 23. Fixing rod; 24. Connecting plate; 25. First hook; 26. Hanging ring; 27. Second hook; 28. Hanging rope; 3. Upstream pipeline interface; 4. Downstream pipe interface. Detailed Implementation

[0018] The present invention will now be described in detail with reference to the accompanying drawings and embodiments. Various examples are provided by way of explanation of the present invention and not by way of limitation. In fact, those skilled in the art will recognize that modifications and variations can be made to the present invention without departing from the scope or spirit of the invention. For example, a feature represented or described as part of one embodiment may be used in another embodiment to produce yet another embodiment. Therefore, it is desirable that the present invention encompass such modifications and variations that fall within the scope of the appended claims and their equivalents.

[0019] It should be noted that, in order to clearly show the structural relationship of the key internal components of this utility model, some pipes, lines, support brackets and other components of the actual product are omitted in the drawings. However, the specific design schemes of these omitted components are all easily implemented by those skilled in the art based on the technical solutions currently provided by this utility model and conventional design.

[0020] In the description of this utility model, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," and "bottom," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and do not require that this utility model be constructed and operated in a specific orientation; therefore, they should not be construed as limitations on this utility model. The terms "connected," "linked," and "set up" used in this utility model should be interpreted broadly. For example, they can refer to a fixed connection or a detachable connection; they can refer to a direct connection or an indirect connection through intermediate components. Those skilled in the art can understand the specific meaning of the above terms according to the specific circumstances.

[0021] Example 1: like Figures 1-23 As shown, this utility model provides a HVAC duct filtration device, including a detachably connected upper connecting sleeve 1 and a lower connecting sleeve 2: The upper connecting sleeve 1 is used to be fitted on the outside of the upstream pipe interface 3. The bottom of the upper connecting sleeve 1 is provided with a connecting hole 11, and a connecting pipe 12 is connected through the connecting hole 11. The connecting pipe 12 extends into the interior of the lower connecting sleeve 2. The lower connecting sleeve 2 is used to be embedded inside the downstream pipe interface 4. The lower connecting sleeve 2 is provided with a first filter barrel 21 and a second filter barrel 22. The first filter barrel 21 is fitted around the connecting pipe 12. The bottom of the first filter barrel 21 is provided with a plurality of first filter holes 211. The second filter barrel 22 is fitted around the bottom of the first filter barrel 21. The bottom of the second filter barrel 22 is provided with a plurality of second filter holes 221, so that the heating and ventilation medium can flow into the downstream pipe interface 4 in sequence through the upstream pipe interface 3, the connecting pipe 12, the first filter hole 211 and the second filter hole 221.

[0022] In practice, an internal thread can be provided inside the upper connecting sleeve 1, and an external thread that matches it can be provided outside the upstream pipe interface 3. The upper connecting sleeve 1 and the upstream pipe interface 3 can be fixedly fitted by thread engagement. Alternatively, an external thread can be provided outside the lower connecting sleeve 2, and an internal thread that matches it can be provided inside the downstream pipe interface 4. The lower connecting sleeve 2 and the downstream pipe interface 4 can be securely embedded by thread engagement.

[0023] The connecting hole 11 at the bottom of the upper connecting sleeve 1 and the connecting pipe 12 can be integrally formed or welded. The connecting pipe 12 extends into the interior of the lower connecting sleeve 2, allowing the HVAC medium transported by the upstream pipe interface 3 to be directly introduced into the filter structure inside the lower connecting sleeve 2. The connecting pipe 12 extending into the lower connecting sleeve 2 allows the HVAC medium transported by the upstream pipe interface 3 to be directly introduced into the first filter barrel 21, preventing leakage or eddy currents at the connection point of the upper and lower connecting sleeves. Simultaneously, it shortens the path of the medium into the filter structure, reduces flow resistance, ensures efficient medium transport, and ensures uniform distribution of the medium within the first filter barrel 21, improving the filtration effect.

[0024] The first filter barrel 21 inside the lower connecting sleeve 2 is fitted around the connecting pipe 12, and the second filter barrel 22 is fitted around the bottom of the first filter barrel 21. The inner diameter of the second filter hole 221 can be smaller than the inner diameter of the first filter hole 211, forming a gradient filtration structure.

[0025] In addition to threaded connection, the detachable connection between the upper connecting sleeve 1 and the lower connecting sleeve 2 can also be achieved by snap-fit. Specifically, an elastic claw can be set on the outer circumference of the bottom of the upper connecting sleeve 1, and a groove matching the elastic claw can be set on the inner circumference of the top of the lower connecting sleeve 2. The locking is achieved by the snap-fit ​​between the claw and the groove. The sleeve can be separated by pressing the elastic claw. Alternatively, a flange connection can be used. Flanges are set on the bottom of the upper connecting sleeve 1 and the top of the lower connecting sleeve 2 respectively. The sleeve can be fixed by bolts passing through the flanges. The sleeve can be separated by removing the bolts.

[0026] In addition to threaded connection, the detachable connection between the first filter barrel 21 and the upper connecting sleeve 1 can also be achieved by snap-fit. For example, an annular groove is provided on the inner side of the bottom of the upper connecting sleeve 1, and a matching locking platform is provided on the top of the first filter barrel 21. The locking platform is embedded into the groove to achieve fixation. Alternatively, a plug-in connection can be used, with a positioning pin provided at the bottom of the upper connecting sleeve 1 and a positioning hole provided at the top of the first filter barrel 21. The positioning pin is inserted into the positioning hole to achieve quick assembly.

[0027] The second filter barrel 22 and the lower connecting sleeve 2 can be connected by snap-fit, for example, by setting an axial groove on the inner wall of the lower connecting sleeve 2 and setting a protrusion on the outer periphery of the second filter barrel 22 that matches the groove, and the protrusion is inserted along the groove to achieve fixation; or they can be connected by threads, with an external thread on the outer periphery of the second filter barrel 22 and an internal thread on the inner wall of the lower connecting sleeve 2, and fixed by screwing.

[0028] When the device is connected to a vertical section of the pipeline, the upper connecting sleeve 1 is fitted on the outside of the upstream pipeline interface 3, and the lower connecting sleeve 2 is embedded in the inside of the downstream pipeline interface 4. Due to gravity, the medium passes through the connecting pipe 12, the first filter hole 211, and the second filter hole 221 from top to bottom, achieving gradient filtration. When connected to an inclined section of the pipeline, due to the guiding effect of the internal connecting pipe 12 and the structural design of the filter barrel, the medium can flow smoothly through the filter structure along the inclined direction, and there will be no dead angle in the filtration due to the inclination of the pipeline.

[0029] This utility model utilizes a gradient filtration structure with dual filter barrels (the first filter hole 211 filters large particulate impurities, and the second filter hole 221 filters small particulate impurities) to achieve thorough purification of impurities such as metal shavings, welding slag, and scale particles in HVAC media, thus solving the problem of insufficient filtration. Furthermore, the multiple detachable connection methods between the upper connecting sleeve 1 and the lower connecting sleeve 2, and between the filter barrel and the connecting sleeve, simplify the disassembly and assembly process, facilitating regular cleaning or replacement of filter components and resolving the issue of cumbersome disassembly and assembly.

[0030] Example 2: Furthermore, the bottom inner side of the upper connecting sleeve 1 is provided with an annular ramp structure 13, and the upper end of the connecting hole 11 is connected to the lower end of the annular ramp structure 13.

[0031] In specific implementation, the annular ramp structure 13 on the inner side of the bottom of the upper connecting sleeve 1 can be integrally formed with the upper connecting sleeve 1. The slope of the annular ramp structure 13 can be set to 30~45°. This slope range can ensure that the HVAC medium has less residue during flow and form a reasonable height difference. Based on this, after the medium flows into the upper connecting sleeve 1 from the upstream pipe interface 3, it flows along the ramp surface of the annular ramp structure 13 to the connecting hole 11. During this process, the medium flows from the inner channel of the upper connecting sleeve 1 with a larger inner diameter (corresponding to the upper end of the annular ramp structure 13) to the connecting hole 11 with a smaller inner diameter (corresponding to the lower end of the annular ramp structure 13), forming a "large inner diameter → small inner diameter" flow path. When the system stops running or the downstream pressure changes, if the downstream medium has a backflow tendency, the height difference formed by the annular ramp structure 13 will generate liquid column pressure, which will hinder the reverse flow of the medium. At the same time, the slope of 30~45° makes the medium flow smoothly and reduces residue, which can prevent the residual medium from forming a channel during backflow, further enhancing the anti-backflow effect.

[0032] Example 3: Furthermore, the bottom inner side of the upper connecting sleeve 1 is provided with a sealing groove 14 for embedding a sealing ring, so that the bottom of the upstream pipe interface 3 can abut against the sealing ring provided in the sealing groove 14.

[0033] In practical implementation, the sealing groove 14 on the inner side of the bottom of the upper connecting sleeve 1 can be designed as an annular shape and integrally formed with the upper connecting sleeve 1. The sealing ring embedded in the sealing groove 14 can be made of rubber material resistant to HVAC media corrosion (such as fluororubber). The size of the sealing ring can be customized according to the shape and size of the sealing groove 14 to ensure that the sealing ring can be tightly embedded in the sealing groove 14 without loosening.

[0034] The pressure at the upstream pipe interface 3 is greater than that at the downstream pipe interface 4, making it easier for the medium to leak from the connection between the upstream pipe interface 3 and the upper connecting sleeve 1. When the upstream pipe interface 3 and the upper connecting sleeve 1 are fixed by screwing them together, the bottom of the upstream pipe interface 3 will tightly abut against the sealing ring in the sealing groove 14. After being compressed, the sealing ring undergoes elastic deformation, filling the gap between the bottom of the upstream pipe interface 3 and the sealing groove 14, forming a reliable sealing structure to prevent high-pressure medium leakage.

[0035] Example 4: Furthermore, the first filter hole 211 is connected to the external pipe 212 so that the heating and ventilation medium can flow into the downstream pipe interface 4 through the upstream pipe interface 3, the connecting pipe 12, the first filter hole 211, the external pipe 212 and the second filter hole 221 in sequence.

[0036] In practice, there are multiple first filter holes 211 and multiple external pipes 212. The first filter holes 211 can be evenly distributed at the bottom of the first filter barrel 21, and the external pipes 212 can be designed as a semi-circular structure. The external pipes 212 create a height difference between the first filter holes 211 and the second filter holes 221. When the system stops running, the medium in the second filter barrel 22 is difficult to flow back through the external pipes 212 and the first filter holes 211 into the first filter barrel 21 due to the height difference, thus preventing backflow to the upstream pipe interface 3.

[0037] The semi-circular outer pipe 212 can guide the medium to flow in a specific direction to the upper part of the filter screen of the second filter barrel 22, so that impurities are evenly attached to the filter screen and avoid impurities from clogging a certain area. At the same time, the outer pipe 212 can reduce turbulence during the flow of the medium, reduce the probability of impurities accumulating around the first filter hole 211, and is less likely to clog deeper pipes.

[0038] Example 5: Furthermore, the top of the first filter barrel 21 is threadedly connected to the bottom of the upper connecting sleeve 1.

[0039] In practice, the external thread can be located on the top outer periphery of the first filter barrel 21, and the internal thread can be located on the bottom of the upper connecting sleeve 1. A fixed connection is achieved by screwing the external thread on the top of the first filter barrel 21 into the internal thread on the bottom of the upper connecting sleeve 1. Alternatively, the external thread can be located on the protruding outer periphery of the bottom of the upper connecting sleeve 1, and the internal thread can be located on the top inner periphery of the first filter barrel 21. A fixed connection is achieved by screwing the external thread on the protruding bottom of the upper connecting sleeve 1 into the internal thread on the top of the first filter barrel 21.

[0040] Example 6: Furthermore, the top of the second filter barrel 22 is threadedly connected to the bottom of the upper connecting sleeve 1.

[0041] In practice, the external thread can be located on the top outer periphery of the second filter barrel 22, and the internal thread can be located on the bottom of the upper connecting sleeve 1 (and located outside the connecting thread of the first filter barrel 21). The two are fixedly connected by screwing the external thread on the top of the second filter barrel 22 with the internal thread on the bottom of the upper connecting sleeve 1. Alternatively, the external thread can be located on the protruding outer periphery of the bottom of the upper connecting sleeve 1 (located outside the connecting thread of the first filter barrel 21), and the internal thread can be located on the top inner periphery of the second filter barrel 22. The two are fixedly connected by screwing the external thread on the protruding bottom of the upper connecting sleeve 1 with the internal thread on the top of the second filter barrel 22.

[0042] Example 7: Furthermore, a drain trough 15 is designed on the top outer side of the upper connecting sleeve 1, and a drain pipe 16 is connected through the bottom of the drain trough 15.

[0043] In practice, the drain trough 15 can be designed as an annular groove, and the drain trough 15 can be integrally formed with the upper connecting sleeve 1. The drain pipe 16 can be welded to the drain trough 15 or threadedly connected, and the other end of the drain pipe 16 can be connected to a waste liquid collection device or a drainage pipe.

[0044] In areas with strict humidity requirements, such as data centers, when media leakage occurs at the connection between the HVAC duct interface and the upper connecting sleeve 1, the leaked media will flow into the drain trough 15 on the outer side of the top of the upper connecting sleeve 1 due to gravity (the drain trough 15 surrounds the top of the upper connecting sleeve 1 and can collect the leaked media completely). Since the drain trough 15 is equipped with a drain pipe 16 at the bottom, and the drain pipe 16 is connected to a collection device or drainage pipe, the leaked media collected in the drain trough 15 will flow naturally along the drain pipe 16 and eventually be discharged to a designated location, preventing the leaked media from spreading to the surrounding environment and affecting the normal operation of the equipment in the data center.

[0045] Example 8: Furthermore, the second filter barrel 22 is filled with filter media 222.

[0046] In specific implementation, the filter media 222 filled inside the second filter barrel 22 can be selected from the following components: activated carbon, which can be granular activated carbon, has good adsorption performance and can adsorb odors, small organic matter and other impurities in the heating and ventilation medium; ceramic particles, which can be porous ceramic particles, have the characteristics of high temperature resistance and corrosion resistance, and can further filter small solid particles in the medium; fiber cotton, which can be glass fiber cotton or polyester fiber cotton, can intercept ultrafine particulate impurities in the medium and improve the filtration accuracy.

[0047] The filter media 222 fills the interior of the second filter chamber 22, located above the second filter holes 221, ensuring that the HVAC medium can fully pass through the filter media 222 for filtration. The filter media 222 inside the second filter chamber 22 further enhances the filtration accuracy based on the gradient filtration of the first filter chamber 21. While the first filter holes 211 and second filter holes 221 primarily intercept solid particulate impurities, the filter media 222 can deeply purify impurities such as tiny particles, organic matter, and odors, resulting in higher purity of the HVAC medium.

[0048] Example 9: Furthermore, a fixing rod 23 is detachably connected to the side wall of the first filter barrel 21. The fixing rod 23 is connected to a first hook 25 through a connecting plate 24. The inner wall of the second filter barrel 22 is provided with a hanging ring 26 that cooperates with the first hook 25. The second filter barrel 22 is fitted around the bottom of the first filter barrel 21 through the cooperation of the hanging ring 26 and the first hook 25.

[0049] In specific implementation, the fixed rod 23 is detachably connected to the side wall of the first filter barrel 21. Specifically, a through hole can be provided on the side wall of the first filter barrel 21, and the inner diameter of the through hole is adapted to the outer diameter of the fixed rod 23. After the fixed rod 23 passes through the through hole, it can be fixed by a nut (which engages with the external thread at the end of the fixed rod 23). Alternatively, an elastic retaining ring can be provided in the middle of the fixed rod 23. When the fixed rod 23 passes through the through hole, the elastic retaining ring pops out and abuts against the inner wall of the first filter barrel 21 to achieve fixation. When disassembling, the fixed rod 23 can be pulled out by pressing the elastic retaining ring.

[0050] Since the filtration level of the second filter cartridge 22 is higher than that of the first filter cartridge 21, its maintenance frequency is higher than that of the first filter cartridge 21. Therefore, the hook-type connection method facilitates quick replacement of the second filter cartridge 22, and can also reduce wear caused by repeated screwing and thread damage caused by HVAC medium corrosion.

[0051] Example 10: Furthermore, the outer wall of the connecting pipe 12 is connected to the connecting cylinder 17, and the fixing rod 23 passes through the side wall of the first filter barrel 21 and is connected to the inner wall of the connecting cylinder 17.

[0052] In practical implementation, the connecting cylinder 17 provides an additional support point for the fixing rod 23, preventing bending or breakage that may occur if the fixing rod 23 is supported only by the through hole in the side wall of the first filter barrel 21, thus improving the load-bearing capacity of the fixing rod 23. Connecting the first filter barrel 21 and the connecting cylinder 17 by the fixing rod 23 strengthens the relative fixation between the first filter barrel 21 and the connecting pipe 12, preventing relative displacement caused by media impact during operation and ensuring the stability of the filtration structure.

[0053] The fixing rod 23 and the inner wall of the connecting cylinder 17 can be connected in several ways: threaded connection, where an internal thread is provided on the inner wall of the connecting cylinder 17 and an external thread is provided on the end of the fixing rod 23, and the fixing is achieved by thread engagement, resulting in a strong connection stability; snap-fit, where an annular groove is provided on the inner wall of the connecting cylinder 17 and an elastic claw is provided on the end of the fixing rod 23, and when the fixing rod 23 is inserted into the connecting cylinder 17, the elastic claw engages in the groove to achieve fixation, making disassembly convenient; and plug-in, where an interference fit is used between the inner wall of the connecting cylinder 17 and the end of the fixing rod 23, and the fixing is achieved by plug-in, resulting in a simple structure and high assembly efficiency.

[0054] One end of the fixing rod 23 located outside the first filter barrel 21 can also be rotatably connected to the second hook 27 via a rotating shaft. Specifically, a shaft hole can be provided at the end of the fixing rod 23, and a rotating shaft can be provided at one end of the second hook 27. The rotating shaft is embedded in the shaft hole to ensure that the second hook 27 can rotate flexibly. The second hook 27 can be connected to the hanging rope 28 connected to the bottom of the upper connecting sleeve 1. The hanging rope 28 can be made of corrosion-resistant elastic material, such as fluororubber rope or polytetrafluoroethylene fiber rope, which can adapt to the corrosive environment of HVAC media, while its elastic properties can buffer vibrations during the operation of the device.

[0055] During assembly, firstly, all the first hooks 25 can be fastened to the hanging rings 26 on the inner wall of the second filter barrel 22. Then, the second hooks 27 can be hooked to the hanging rope 28 connected to the bottom of the upper connecting sleeve 1. Subsequently, the fixing rod 23 can be passed through the connecting plate 24 and the through hole on the side wall of the first filter barrel 21 in sequence, and finally snapped or inserted into the inner wall of the connecting cylinder 17. At this time, the fixing rod 23 can be provided with upward force by the second hooks 27 (through the hanging rope 28) and the connecting cylinder 17 respectively. The connecting plate 24, which is connected to the first hooks 25, is located between the second hooks 27 and the connecting cylinder 17. Its downward weight is shared by the connecting cylinder 17 and the second hooks 27, ensuring the overall structure is stable. Finally, the lower connecting sleeve 2 can be threaded to the bottom of the upper connecting sleeve 1.

[0056] During disassembly, the lower connecting sleeve 2 can be unscrewed from the bottom of the upper connecting sleeve 1, then the connection between the fixing rod 23 and the connecting cylinder 17 can be released, then the second hook 27 can be removed from the hanging rope 28, and finally the first hook 25 and the hanging ring 26 can be separated to achieve the separation of the second filter barrel 22, the first filter barrel 21 and the upper connecting sleeve 1.

[0057] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A HVAC duct filtration device, comprising a detachably connected upper connecting sleeve (1) and a lower connecting sleeve (2), characterized in that: The upper connecting sleeve (1) is used to be fitted on the outside of the upstream pipe interface (3). The bottom of the upper connecting sleeve (1) is provided with a connecting hole (11). The connecting hole (11) is connected to a connecting pipe (12). The connecting pipe (12) extends into the interior of the lower connecting sleeve (2). The lower connecting sleeve (2) is used to be embedded in the inner side of the downstream pipe interface (4). The lower connecting sleeve (2) is provided with a first filter barrel (21) and a second filter barrel (22). The first filter barrel (21) is fitted around the periphery of the connecting pipe (12). The bottom of the first filter barrel (21) is provided with a plurality of first filter holes (211). The second filter barrel (22) is fitted around the bottom of the first filter barrel (21). The bottom of the second filter barrel (22) is provided with a plurality of second filter holes (221), so that the heating and ventilation medium can flow into the downstream pipe interface (4) in sequence through the upstream pipe interface (3), the connecting pipe (12), the first filter hole (211) and the second filter hole (221).

2. The HVAC duct filtration device according to claim 1, characterized in that: The bottom inner side of the upper connecting sleeve (1) is provided with an annular ramp structure (13), and the upper end of the connecting hole (11) is connected to the lower end of the annular ramp structure (13).

3. The HVAC duct filtration device according to claim 1, characterized in that: The bottom inner side of the upper connecting sleeve (1) is provided with a sealing groove (14) for embedding a sealing ring, so that the bottom of the upstream pipe interface (3) can abut against the sealing ring provided in the sealing groove (14).

4. The HVAC duct filtration device according to claim 1, characterized in that: The first filter hole (211) is connected to an external pipe (212) so that the heating and ventilation medium can flow into the downstream pipe interface (4) through the upstream pipe interface (3), the connecting pipe (12), the first filter hole (211), the external pipe (212) and the second filter hole (221) in sequence.

5. The HVAC duct filtration device according to claim 1, characterized in that: The top of the first filter barrel (21) is threadedly connected to the bottom of the upper connecting sleeve (1).

6. The HVAC duct filtration device according to claim 1 or 5, characterized in that: The top of the second filter barrel (22) is threaded to the bottom of the upper connecting sleeve (1).

7. The HVAC duct filtration device according to claim 1, characterized in that: The upper connecting sleeve (1) has a drain groove (15) on its top outer side, and a drain pipe (16) is connected through the bottom of the drain groove (15).

8. The HVAC duct filtration device according to claim 1, characterized in that: The second filter barrel (22) is filled with filter media (222).

9. The HVAC duct filtration device according to claim 1 or 5, characterized in that: The side wall of the first filter barrel (21) is detachably connected to a fixing rod (23), and the fixing rod (23) is connected to a first hook (25) through a connecting plate (24). The inner wall of the second filter barrel (22) is provided with a hanging ring (26) that cooperates with the first hook (25). The second filter barrel (22) is sleeved on the periphery of the bottom of the first filter barrel (21) through the cooperation between the hanging ring (26) and the first hook (25).

10. The HVAC duct filtration device according to claim 9, characterized in that: The outer wall of the connecting pipe (12) is connected to the connecting cylinder (17), and the fixing rod (23) passes through the side wall of the first filter barrel (21) and is connected to the inner wall of the connecting cylinder (17).

Images