A HVAC duct filter and dirt remover

Abstract

This invention discloses a HVAC duct filter and cleaner, belonging to the technical field of HVAC duct components. It includes an oblique tee, a stainless steel filter screen, a sealing base, a cleaning valve, and a drain pipe assembly. The oblique tee has a neck on its inner side; a retaining edge is provided near the input end of the neck; the stainless steel filter screen has a cylindrical structure, with one end installed to the neck and the other end fitting against the retaining edge; the other end of the stainless steel filter screen connects to the inclined end of the oblique tee; the sealing base includes a pipe seat body screwed to the inclined end of the oblique tee, and the front end of the pipe seat body is integrally formed with a guide ring seat that fits against the inner wall of the stainless steel filter screen; the stainless steel filter screen fits against the end of the pipe seat body; the cleaning valve includes a cavity seat screwed to the lower end of the pipe seat body. This HVAC duct filter and cleaner uses flow pressure to achieve online cleaning of the stainless steel filter screen, and the discharge of impurities from the flow medium will not affect the normal operation of the HVAC system.

Description

Technical Field

[0001] This invention specifically relates to a filter and desiccant for HVAC ducts, belonging to the field of HVAC duct component technology. Background Technology

[0002] HVAC duct filtration and cleaning is a crucial part of HVAC systems. Its purpose is to filter and remove solid particles, sediments, impurities, and contaminants from pipes to maintain the normal operation of pipes and equipment, extend their lifespan, and ensure efficient system operation. Existing duct cleaners, such as the one disclosed in Chinese Patent Publication No. CN222489134U, include a main pipe with external threads at its top. A cap is movably connected to the top of the main pipe, and a positioning block is fixedly connected above the cap. A filter screen is connected inside the cap, and a connecting pipe is connected above the filter screen. This structure, by designing the cleaner in sections, facilitates quick disassembly for internal cleaning. It also uses control components to control the water flow, allowing for discharge as needed. Another example is the self-cleaning HVAC filter disclosed in Chinese Patent Publication No. CN218047044U, which can automatically clean itself, effectively improving filter cleaning efficiency. However, this structure requires a motor drive, and the roller brush can cause filter clogging. Furthermore, the HVAC system needs to be shut down for wastewater discharge. Summary of the Invention

[0003] To address the aforementioned issues, this invention proposes a HVAC duct filter cleaner that uses flow pressure to clean the stainless steel filter screen online. When the flow medium containing impurities is discharged, it will not disrupt the normal operation of the HVAC system.

[0004] The HVAC duct filter and decontaminator of the present invention comprises:

[0005] An oblique tee, wherein a neck is provided on the inner side of the oblique tee; a retaining edge is provided on the neck near the input end;

[0006] The stainless steel filter screen has a cylindrical structure. One end of the stainless steel filter screen is installed with the neck opening and the end end is fitted with the baffle. The other end of the stainless steel filter screen is connected to the inclined end of the oblique tee.

[0007] A sealing tube seat; the sealing tube seat includes a tube seat body that is screwed to the inclined end of a tee, and the front end of the tube seat body is integrally formed with a guide ring seat that fits against the inner wall of a stainless steel filter screen; the stainless steel filter screen fits against the end of the tube seat body.

[0008] A decontamination valve includes a cavity seat screwed to the lower end of a tube seat body. The cavity seat has multiple drain ports near the guide ring seat. A limiting seat is integrally formed on the outside of the cavity seat and inside the drain ports. A downwardly protruding spring tube chamber is integrally formed at the center of the cavity seat. A first spring body is disposed inside the spring tube chamber. A sealing plate is attached to the bottom of the guide ring seat. A protruding post is fixed at the center of the bottom surface of the sealing plate. The protruding post is movably engaged with the spring tube chamber. The narrow end of the protruding post movably passes through the first spring body and extends out of the bottom of the spring tube chamber.

[0009] The drain pipe assembly is fixed to the bottom of the spring tube compartment.

[0010] In use, the inlet and outlet of the oblique tee are connected in series to the heating pipeline. The medium from the heating pipeline enters the oblique tee through the inlet and is filtered through a stainless steel filter screen. The medium then exits through the outlet of the oblique tee, where impurities are filtered and intercepted. When the outlet of the oblique tee is closed, the inlet of the oblique tee maintains pipe pressure. Under the pressure of the medium, the sealing plate is pushed down. At this time, the first spring body is compressed, and the protrusion slides down in the spring tube chamber. The medium carrying impurities enters the interior of the tube seat through the drain port and is finally discharged into the drain pipe assembly. When the drain pipe assembly is filled with medium, the overall pipe pressure is balanced. When the outlet of the oblique tee is reopened, the water pressure on the sealing plate decreases. At this time, the first spring body drives the sealing plate to reset, and the sealing plate and the guide ring seat are pressed together, completely sealing the flow channel. The sealing plate can only be reopened when sewage containing impurities is discharged from the drain pipe assembly.

[0011] Furthermore, the drain pipe assembly includes a drain pipe section, with a first valve body and a second valve body fixed at both ends of the drain pipe section, and the first valve body is fixed to the bottom of the spring tube compartment.

[0012] The drain pipe assembly adopts a structure consisting of a drain pipe section, a first valve body, and a second valve body. At any given time, only one of the first and second valve bodies can be opened; that is, when the first valve body is open, the second valve body is closed, and vice versa. This ensures that the third end of the oblique tee is always in a closed state. Through the cooperation of the first and second valve bodies, sewage containing impurities in the drain pipe assembly can be discharged without affecting the normal operation of the HVAC system.

[0013] Furthermore, the drain pipe section is a tee pipe; a second filter is fixed at the third end of the tee pipe, and the second filter is connected to the return pipe network; the tee pipe can be cleaned periodically. During cleaning, the first valve body and the valve between the second filter and the return pipe network are closed, while the second valve body is opened to flush the inside of the tee pipe. In addition, the tee pipe can be replaced periodically; when replacing, the first valve body needs to be locked, and the entire replacement process does not affect the normal operation of the HVAC system; the second filter is connected to the third end of the tee pipe, and after the impurities in the drain pipe section are filtered by the second filter, the filter medium is sent back into the return pipe network, and the impurities can be discharged through the second valve body at the bottom of the tee pipe.

[0014] Furthermore, a first electrically controlled valve is fixed to the drain end of the second filter; the first electrically controlled valve is connected to the return pipe network; a pressure transmitter is also installed on the three-way pipe; the pressure transmitter is linked to the first electrically controlled valve through a controller; the pressure transmitter monitors the pipe pressure of the three-way pipe in real time, and when the pipe pressure reaches the set value, the first electrically controlled valve is opened to discharge the filtrate into the return pipe network, which can keep the three-way pipe in a low-pressure state, thereby enabling the filter to be cleaned periodically; at this time, the filter filter as a whole is used as a heat-consuming end, and after the first electrically controlled valve is opened, it is closed within a set time; this avoids the long-term overlap of the opening of the sealing plate and the opening of the first electrically controlled valve, which would lead to energy waste.

[0015] Furthermore, the diagonal sides of the oblique tee are integrally formed with oblique pipe sections, and an automatic cleaning unit is fixed at the top of the oblique pipe sections. The automatic cleaning unit includes a pressure chamber, and a guide tube is integrally formed at the bottom of the pressure chamber. A drive rod is slidably arranged inside the oblique pipe section, and a plug is fixed at the top of the drive rod through the guide tube. A second spring body is sleeved between the drive rod and the plug and the oblique pipe section. A scraper ring is movably fitted to the inner wall of the stainless steel filter screen. A grid is fixed inside the scraper ring. The drive rod is fixed at the center of the grid. A pressure sampling tube connected to the heating pipeline is provided on the pressure chamber.

[0016] When the outlet end of the oblique tee is closed, the inlet end of the oblique tee maintains the pipe pressure. The medium enters the pressure chamber through the pressure sampling pipe and is stored in the pressure chamber. When the water pressure reaches the set value, the driving plunger moves down along the guide pipe, thereby causing the driving rod to move down synchronously and driving the scraper ring to move down along the stainless steel filter screen. The scraper ring scrapes away impurities from the stainless steel filter screen. When the scraper ring reaches the bottom of the stainless steel filter screen, it pushes down the sealing plate, thereby opening the third end flow channel of the oblique tee. The scraped impurities are sent into the pipe seat through the medium and then into the drain pipe assembly.

[0017] Furthermore, a second electrically controlled valve is installed on the heating pipeline; the second electrically controlled valve can be opened periodically to clean the dirt separator online.

[0018] Furthermore, a brush is provided on the outside of the scraper ring, and the brush is in movable contact with the inner wall of the stainless steel filter screen.

[0019] Furthermore, the scraper ring has multiple contacts fixed to its inner bottom that move in contact with the sealing plate; when the scraper ring moves to the bottom, the contacts can drive the scraper ring downward, thereby opening the flow channel at the third end of the oblique tee.

[0020] Furthermore, the top of the stainless steel filter screen is integrally formed with a threaded tube section, which is movably screwed to the neck.

[0021] Compared with existing technologies, the HVAC duct filter and decontaminator of this invention uses flow pressure to trigger the opening of the sealing plate and to clean the stainless steel filter screen online. The impurity-laden flow medium is introduced into the drain pipe assembly, and during HVAC system operation, the impurity-laden flow medium in the drain pipe assembly can be discharged without interfering with the normal operation of the HVAC system. This achieves online cleaning of the stainless steel filter screen. When pipe pressure fluctuates, such as when the opening of the terminal valve changes, the stainless steel filter screen can be automatically and dynamically cleaned. Furthermore, during stainless steel filter screen cleaning, the decontaminator can be used as a heat source. After the impurity-laden flow medium enters the drain pipe assembly, it is directly returned to the return pipe network through filtration, allowing the cleaning and filtration water to flow back, forming a closed-loop decontamination system. Impurities can be discharged through the first valve body or the tee pipe can be replaced periodically. During replacement, the first valve body needs to be locked, and the entire replacement process does not affect the normal operation of the HVAC system. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall structure of Embodiment 1 of the HVAC duct filter and dirt remover of the present invention.

[0023] Figure 2 For the present invention Figure 1 A magnified schematic diagram of the structure at point A in the middle.

[0024] Figure 3 For the present invention Figure 1 A magnified schematic diagram of the structure at point B in the middle.

[0025] Figure 4 This is a schematic diagram of the installation structure of the sealing seat and the decontamination valve of the present invention.

[0026] Figure 5 This is a schematic diagram of the structure of the HVAC duct filter and dirt remover connected to the return pipe network according to the present invention.

[0027] Figure 6 This is a schematic diagram of the overall structure of Embodiment 2 of the HVAC duct filter and dirt remover of the present invention.

[0028] Figure 7 This is a schematic diagram of the overall structure of the execution components of the automatic decontamination unit of the present invention.

[0029] Figure 8 This is a schematic diagram of the overall structure of the HVAC duct filter and the second electrically controlled valve of the present invention.

[0030] Reference numerals: 1. Slanted tee, 2. Neck, 3. Baffle, 4. Stainless steel filter screen, 5. Pipe seat, 6. Guide ring seat, 7. Tube seat, 8. Drain port, 9. Limiting seat, 10. Spring tube compartment, 11. First spring body, 12. Sealing plate, 13. Protrusion, 14. Drain section, 15. First valve body, 16. Second valve body, 17. Contact, 18. Second filter, 19. First solenoid valve, 20. Pressure transmitter, 21. Slanted tube section, 22. Pressure compartment, 23. Guide tube, 24. Drive rod, 25. Plug, 26. Second spring body, 27. Scraper ring, 28. Grille, 29. Pressure sampling tube, 30. Second solenoid valve, 31. Brush. Detailed Implementation

[0031] Example 1:

[0032] like Figures 1 to 5 The HVAC duct filter shown includes:

[0033] An oblique tee 1 has a neck 2 on its inner side; a retaining edge 3 is provided near the input end of the neck 2.

[0034] Stainless steel filter screen 4, the stainless steel filter screen 4 has a cylindrical structure, one end of the stainless steel filter screen 4 is installed with the neck 2 and the end is attached to the baffle 3; the other end of the stainless steel filter screen 4 is connected to the inclined end of the oblique tee 1.

[0035] The sealing tube seat includes a tube seat body 5 that is screwed to the inclined end of the oblique tee 1. The front end of the tube seat body 5 is integrally formed with a guide ring seat 6 that fits against the inner wall of the stainless steel filter screen 4. The stainless steel filter screen 4 fits against the end of the tube seat body 5.

[0036] The drain valve includes a cavity seat 7 screwed to the lower end of the tube seat body 5. The cavity seat 7 has multiple drain ports 8 at one end near the guide ring seat 6. The cavity seat 7 is integrally formed with a limiting seat 9 on the outside and inside the drain ports 8. A downwardly protruding spring tube chamber 10 is integrally formed at the center of the cavity seat 7. A first spring body 11 is provided inside the spring tube chamber 10. A sealing plate 12 is attached to the bottom of the guide ring seat 6. A protruding post 13 is fixed at the center of the bottom surface of the sealing plate 12. The protruding post 13 is movably fitted with the spring tube chamber 10. The narrow end of the protruding post 13 moves through the first spring body 11 and moves out of the bottom of the spring tube chamber 10.

[0037] The drain pipe assembly is fixed to the bottom of the spring tube compartment 10.

[0038] In use, the inlet and outlet of the oblique tee 1 are connected in series to the heating pipeline. The medium from the heating pipeline enters the oblique tee 1 through the inlet and is filtered by the stainless steel filter screen 4. The medium then exits the oblique tee 1 through the outlet. Impurities in the medium are filtered and intercepted by the stainless steel filter screen 4. When the outlet end of the oblique tee 1 is closed, the inlet end of the oblique tee 1 maintains pipe pressure. Under the action of the medium pressure, the sealing plate 12 is pushed down. At this time, the first spring body 11 is compressed, and the protrusion 13 is in the spring. The fluid slides downward within the tube chamber 10, and the fluid carrying impurities enters the tube chamber 7 through the drain port 8 of the tube chamber seat 7, and is finally discharged into the drain pipe group. When the drain pipe group is filled with fluid, the pressure of the entire pipe is kept in balance. When the outlet end of the oblique tee 1 is reopened, the water pressure of the sealing plate 12 decreases. At this time, the first spring body 11 drives the sealing plate 12 to reset, and the sealing plate 12 and the guide ring seat 6 are closed. The sealing plate 12 can only be reopened when the sewage containing impurities in the drain pipe group is discharged.

[0039] The drain pipe assembly includes a drain pipe section 14, with a first valve body 15 and a second valve body 16 fixed at both ends of the drain pipe section 14. The first valve body 15 is fixed to the bottom of the spring tube compartment 10.

[0040] The drain pipe assembly adopts a structure consisting of a drain pipe section 14, a first valve body 15, and a second valve body 16. Only one of the first valve body 15 and the second valve body 16 can be opened at a time. When the first valve body 15 is open, the second valve body 16 is closed; when the second valve body 16 is open, the first valve body 15 is closed, thus ensuring that the third end of the oblique tee 1 is always in a closed state. Through the cooperation of the first valve body 15 and the second valve body 16, sewage containing impurities in the drain pipe assembly can be discharged.

[0041] The drain pipe section 14 is a tee pipe; a second filter 18 is fixed at the third end of the tee pipe, and the second filter 18 is connected to the return pipe network; the tee pipe can be cleaned periodically. During cleaning, the first valve body 15 and the valve between the second filter 18 and the return pipe network are closed. At the same time, the second valve body 16 is opened to flush the inside of the tee pipe. In addition, the tee pipe can be replaced periodically. When replacing, the first valve body 15 needs to be locked. The replacement process does not affect the normal operation of the HVAC system. The second filter 18 is connected to the third end of the tee pipe. After the impurities in the drain pipe section 14 are filtered by the second filter 18, the filter medium is sent back into the return pipe network. The impurities can be discharged through the second valve body 16 at the bottom of the tee pipe.

[0042] The second filter 18 is connected to the return pipe network through the first solenoid valve 19; a pressure transmitter 20 is also installed on the three-way pipe; the pressure transmitter 20 is linked to the first solenoid valve 19 through a controller; the pressure transmitter 20 monitors the pipe pressure of the three-way pipe in real time, and when the pipe pressure reaches the set value, the first solenoid valve 19 is opened to discharge the filtrate into the return pipe network, so that the three-way pipe is always in a low-pressure state, thereby enabling the filter to remove dirt periodically; after the first solenoid valve 19 is opened, it is closed within a set time; this avoids the opening of the sealing plate 12 and the opening of the first solenoid valve 19 overlapping for a long time, resulting in energy waste.

[0043] Example 2:

[0044] like Figures 6 to 8 The HVAC duct filter shown has an inclined tee 1 with an integrally formed inclined pipe section 21 on the diagonal side. An automatic cleaning unit is fixed to the top of the inclined pipe section 21. The automatic cleaning unit includes a pressure chamber 22. A guide tube 23 is integrally formed at the bottom of the pressure chamber 22. A drive rod 24 is slidably arranged inside the inclined pipe section 21. The top of the drive rod 24 passes through the guide tube 23 and is fixed with a plug 25. A second spring body 26 is sleeved between the drive rod 24, the plug 25, and the inclined pipe section 21. A scraper ring 27 is movably fitted to the inner wall of the stainless steel filter screen 4. A grid 28 is fixed inside the scraper ring 27. The drive rod 24 is fixed to the grid 28. A pressure sampling tube 29 connected to the heating pipeline is provided on the pressure chamber 22.

[0045] When the outlet end of the oblique tee 1 is closed, the inlet end of the oblique tee 1 maintains the pipe pressure. The medium enters the pressure chamber 22 through the pressure sampling pipe 29. The medium is stored in the pressure chamber 22. When the water pressure reaches the set value, the driving plunger 25 moves down along the guide pipe 23, thereby causing the driving rod 24 to move down synchronously. The driving scraper ring 27 moves down along the stainless steel filter screen 4. The scraper ring 27 scrapes away impurities from the stainless steel filter screen 4. When the scraper ring 27 reaches the bottom of the stainless steel filter screen 4, it pushes down the sealing plate 12, thereby opening the third end flow channel of the oblique tee 1. The scraped impurities are sent into the pipe seat 7 and into the drain pipe assembly through the medium.

[0046] A second electrically controlled valve 30 is installed on the pressure sampling tube 29. The second electrically controlled valve 30 can be opened periodically to achieve online cleaning of the dirt separator.

[0047] A brush 31 is provided on the outside of the scraper ring 27, and the brush 31 is in contact with the inner wall of the stainless steel filter screen 4.

[0048] The scraper ring 27 has multiple contacts 17 fixed at the bottom inner side that move in contact with the sealing plate 12; when the scraper ring 27 moves to the bottom, the contacts 17 can drive the scraper ring 27 downward, thereby opening the flow channel at the third end of the oblique tee 1.

[0049] The top of the stainless steel filter screen 4 is integrally formed with a threaded tube section, which is movably screwed to the neck 2.

[0050] The above embodiments are merely preferred embodiments of the present invention. Therefore, all equivalent changes or modifications made to the structure, features and principles described in the claims of the present invention are included within the scope of the present invention.

Claims

1. A filter and dirt remover for HVAC ducts, characterized in that: include: An oblique tee, wherein a neck is provided on the inner side of the oblique tee; a retaining edge is provided on the neck near the input end; The stainless steel filter screen has a cylindrical structure. One end of the stainless steel filter screen is installed with the neck opening and the end end is fitted with the baffle. The other end of the stainless steel filter screen is connected to the inclined end of the oblique tee. A sealing tube seat; the sealing tube seat includes a tube seat body that is screwed to the inclined end of a tee, and the front end of the tube seat body is integrally formed with a guide ring seat that fits against the inner wall of a stainless steel filter screen; the stainless steel filter screen fits against the end of the tube seat body. A decontamination valve includes a cavity seat screwed to the lower end of a tube seat body. The cavity seat has multiple drain ports near the guide ring seat. A limiting seat is integrally formed on the outside of the cavity seat and inside the drain ports. A downwardly protruding spring tube chamber is integrally formed at the center of the cavity seat. A first spring body is disposed inside the spring tube chamber. A sealing plate is attached to the bottom of the guide ring seat. A protruding post is fixed at the center of the bottom surface of the sealing plate. The protruding post is movably engaged with the spring tube chamber. The narrow end of the protruding post movably passes through the first spring body and extends out of the bottom of the spring tube chamber. A drain pipe assembly is fixed to the bottom of a pipe cavity seat. The drain pipe assembly includes a discharge pipe section, with a first valve body and a second valve body fixed at both ends. The first valve body is fixed to the bottom of the pipe cavity seat. The discharge pipe section is a three-way pipe, with the end not connected to the first and second valve bodies designated as the third end. A second filter is fixed to the third end of the three-way pipe, and the second filter is connected to a return pipe network. A first electrically controlled valve is fixed to the discharge end of the second filter. The first electrically controlled valve is connected to the return pipe network. A pressure transmitter is also installed on the three-way pipe. The pressure transmitter is linked to the first electrically controlled valve via a controller. The diagonal side of the inclined end of the inclined three-way pipe... The system is integrally formed with an inclined tube section. An automatic cleaning unit is fixed to the top of the inclined tube section. The automatic cleaning unit includes a pressure chamber. A guide tube is integrally formed at the bottom of the pressure chamber. A drive rod is slidably disposed inside the inclined tube section. The top of the drive rod passes through the guide tube and is fixed with a plug. A second spring is sleeved between the drive rod and the plug and the inclined tube section. A scraper ring is movably fitted to the inner wall of the stainless steel filter screen. A grid is fixed inside the scraper ring. The drive rod is fixed at the center of the grid. A pressure sampling tube connected to a heating pipeline is provided on the pressure chamber. Multiple contacts that movably abut against a sealing plate are fixed to the bottom of the inner side of the scraper ring. A second electrically controlled valve is provided on the heating pipeline. The system uses flow pressure to trigger the opening of the sealing plate and perform online cleaning of the stainless steel filter screen. The flow containing impurities is directed into the drain pipe assembly, and the impurities within the drain pipe assembly can be discharged while the HVAC system is operating, without interfering with the normal operation of the HVAC system. This achieves online cleaning of the stainless steel filter screen. When the pipe pressure fluctuates, the stainless steel filter screen can be automatically and dynamically washed. Only one of the first and second valve bodies can be opened at a time. Through the cooperation of the first and second valve bodies, the sewage containing impurities in the drain pipe group is discharged. After the impurities in the drain pipe section are filtered by the second filter, the filter medium is sent back into the return pipe network, and the impurities are discharged through the second valve body at the bottom of the three-way pipe. The pipe pressure of the three-way pipe is monitored in real time by the pressure transmitter. When the pipe pressure reaches the set value, the first solenoid valve is opened to discharge the filtrate into the return pipe network, which can keep the three-way pipe in a low-pressure state and realize the periodic cleaning of the dirt separator.

2. The HVAC duct filter and decontaminator according to claim 1, characterized in that: A brush is provided on the outside of the scraper ring, and the brush is in contact with the inner wall of the stainless steel filter screen.

3. The HVAC duct filter and decontaminator according to claim 1, characterized in that: The top of the stainless steel filter screen is integrally formed with a threaded tube section, which is movably screwed to the neck.

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