A dust removal device for heating, ventilation and air conditioning

Abstract

The utility model discloses a kind of heating ventilation and air conditioning dust removal devices, it is related to heating ventilation and air conditioning technical field, including heating ventilation pipe, the inside of heating ventilation pipe is placed with filter screen plate and fixed frame, the middle part of fixed frame is rotatably connected with rotating rod, multiple blades are installed with array in the end of rotating rod away from filter screen plate, multiple scraping plate that are pasted with filter screen plate are installed with array in the other end of rotating rod, force accumulation trigger mechanism is arranged between rotating rod and fixed frame.In the utility model, through the linkage design of blade, rotating rod and scraping plate, the energy of airflow in pipeline is ingeniously utilized to drive cleaning mechanism, automatic cleaning of filter screen plate is realized, force accumulation trigger mechanism is set, the impact type scraping of this "energy storage-release" mechanism generates, dust cleaning force is large, and efficiency is high, completely solve the industry pain point of insufficient driving force of traditional wind-driven device under low wind pressure, especially suitable for square air pipe low wind pressure and dust condition with strong adhesion.

Description

Technical Field

[0001] This utility model relates to the field of heating, ventilation and air conditioning technology, and in particular to a dust removal device for heating, ventilation and air conditioning. Background Technology

[0002] During the operation of HVAC systems, the airflow in ventilation ducts often carries impurities such as dust and lint. These impurities not only reduce indoor air quality, but also accumulate on the filter devices, leading to increased system air resistance, significantly increased fan energy consumption, and decreased cooling and heating efficiency. Currently, the common maintenance method requires manual disassembly and cleaning of the filter devices after the system is shut down. This process is cumbersome, time-consuming, and costly, and it cannot achieve real-time online cleaning, affecting the continuous and stable operation of the system.

[0003] To address this issue, some self-cleaning filters have emerged in existing technologies. One type of solution relies on motor drive, which achieves automation but requires additional wiring and power supply, increasing system complexity and energy consumption. Its application is limited in special occasions such as explosion-proof environments, and the motor is prone to failure in the closed environment of the duct, making maintenance inconvenient. Another type of solution relies on wind power drive, but its design is usually based on continuous wind propulsion and is only suitable for high-pressure air (water) supply. In common square ventilation ducts, the airflow velocity and pressure are usually low and unstable, resulting in weak driving torque, which is difficult to directly overcome the static friction between the scraper and the filter screen and the starting friction of the rotating mechanism. This often leads to difficulty in starting or no operation at all. Furthermore, even if it can start, the continuous low-speed rotation is insufficient for dust removal, and the cleaning effect is poor for highly adhesive dust, which is prone to incomplete scraping and long-term wear. Utility Model Content

[0004] The purpose of this utility model is to provide a dust removal device for HVAC systems in order to solve the above-mentioned problems.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a dust removal device for HVAC, comprising a HVAC pipe, wherein a filter screen and a fixing frame are placed inside the HVAC pipe, a rotating rod is rotatably connected to the middle of the fixing frame, a plurality of blades are arrayed at one end of the rotating rod away from the filter screen, a plurality of scrapers that fit against the filter screen are arrayed at the other end of the rotating rod, and a force accumulation triggering mechanism is provided between the rotating rod and the fixing frame.

[0006] Preferably, the force accumulation triggering mechanism includes a fixed cylinder installed in the middle of the fixed frame, and a spiral spring is connected between the fixed cylinder and the rotating rod.

[0007] Preferably, a ratchet is installed on the outside of the fixed cylinder cavity of the rotating rod, and a pawl that cooperates with the ratchet is rotated inside the fixed cylinder.

[0008] Preferably, limit plates are installed at both ends inside the fixed cylinder, a sliding hole is provided at the lower end of the pawl, and a push rod with a through sliding hole and a spiral spring is slidably connected between the limit plates at both ends.

[0009] Preferably, a connecting plate is installed on the top of the filter screen and the fixing frame, the top of the HVAC pipe has an installation hole that matches the size of the connecting plate, and the top of the connecting plate has a bolt for threaded connection with the HVAC pipe.

[0010] Preferably, the top of the connecting plate has an insertion hole that matches the size of the filter screen.

[0011] Preferably, the bottom of the HVAC pipe has a through hole located at the lower end of the scraper, and a sliding plate is installed at both ends of the bottom of the HVAC pipe and at the through hole. A storage box is inserted between the two sliding plates. The top of the storage box has a connecting hole corresponding to the position of the through hole. A baffle is hinged to one end of the connecting hole, and an arc-shaped spring is connected between the bottom end of the baffle near the hinge point and the connecting hole.

[0012] In summary, due to the adoption of the above technical solution, the beneficial effects of this utility model are:

[0013] 1. Through the coordinated design of blades, rotating rods and scrapers, the cleaning mechanism is cleverly driven by the energy of the airflow in the pipeline, realizing automatic cleaning of the filter screen. This process does not require external power or manual intervention, which significantly reduces maintenance costs and energy consumption.

[0014] 2. In this application, a force accumulation triggering mechanism is set up, which stores and accumulates the weak and continuous blade rotation torque in a low-pressure environment through a spiral spring. When the energy accumulates to a preset threshold, the mechanism triggers the pawl to release the ratchet through the push rod, so that the energy stored in the spiral spring is released instantly, driving the scraper to rotate at high speed. This "energy storage-release" mechanism generates impact scraping, which has a strong cleaning force and high efficiency, and completely solves the industry pain point of insufficient driving force of traditional wind-driven devices under low wind pressure. It is especially suitable for square air ducts with low wind pressure and strong dust adhesion. Attached Figure Description

[0015] Figure 1 A schematic diagram of the overall structure according to an embodiment of the present utility model is shown;

[0016] Figure 2 A schematic diagram of the filter screen and fixing frame structure provided according to an embodiment of the present utility model is shown;

[0017] Figure 3 A cross-sectional view of a force accumulation triggering mechanism according to an embodiment of the present invention is shown;

[0018] Figure 4A cross-sectional view of a heating, ventilation, and air conditioning (HVAC) pipe structure according to an embodiment of the present invention is shown;

[0019] Figure 5 An enlarged cross-sectional view of a portion of the upper structure of a storage box according to an embodiment of the present invention is shown.

[0020] Legend:

[0021] 1. HVAC pipe; 101. Mounting hole; 102. Through hole; 2. Filter screen; 3. Fixing bracket; 4. Rotating rod; 5. Blade; 6. Scraper; 7. Force accumulation triggering mechanism; 701. Fixing cylinder; 702. Scroll spring; 703. Ratchet; 704. Pawl; 7041. Sliding hole; 705. Limiting plate; 706. Push rod; 8. Connecting plate; 801. Insertion hole; 9. Bolt; 10. Slide plate; 11. Storage box; 1101. Connecting hole; 12. Baffle; 13. Curved spring. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0023] Please see Figure 1-3 This utility model provides a technical solution: a dust removal device for HVAC, including a HVAC pipe 1, a filter screen plate 2 and a fixing frame 3 placed inside the HVAC pipe 1, a rotating rod 4 rotatably connected to the middle of the fixing frame 3, a plurality of blades 5 are arranged in an array at one end of the rotating rod 4 away from the filter screen plate 2, a plurality of scrapers 6 that are in contact with the filter screen plate 2 are arranged in an array at the other end of the rotating rod 4, and a force accumulation triggering mechanism 7 is provided between the rotating rod 4 and the fixing frame 3;

[0024] The force accumulation triggering mechanism 7 includes a fixed cylinder 701 installed in the middle of the fixed frame 3. A spiral spring 702 is connected between the inside of the fixed cylinder 701 and the rotating rod 4. A ratchet 703 is installed on the outside of the cavity of the fixed cylinder 701 on the rotating rod 4. A pawl 704 that works with the ratchet 703 is rotatably installed inside the fixed cylinder 701. Limiting plates 705 are installed at both ends inside the fixed cylinder 701. A sliding hole 7041 is opened at the lower end of the pawl 704. A push rod 706 that passes through the sliding hole 7041 and the spiral spring 702 is slidably connected between the two limiting plates 705.

[0025] In HVAC systems, the main air ducts for supply and return air, as well as the branch air ducts distributed to various rooms, are mostly square (rectangular) ducts to fit the building structure and save ceiling space. As the challenge of low air pressure conditions mentioned in the background art is more prominent in square ducts, this patent aims to solve the industry pain point of "insufficient wind drive efficiency of square ducts under low air pressure" and to more intuitively show the fixing bracket 3, slide plate 10 and storage box 11 in the figure. Therefore, in this patent, a square HVAC duct 1 is used as an example. In actual use, various shapes such as circles, squares and rectangles that are common in the art can also be applied. It should be noted that achieving similar functions in a round duct may require additional mounting brackets or flanges, but these are all conventional adaptive modifications that can be easily implemented by those skilled in the art.

[0026] In practice, the rotating rod 4 is set horizontally along the airflow direction, the installation angle of the blade 5 needs to be designed to ensure that it can capture the maximum wind energy and generate rotational torque even under low wind pressure, and the scraper 6 is made of a material with a certain degree of flexibility (such as nylon or polyurethane) to ensure that it can keep in close contact with the surface of the filter screen 2, while not excessively abrading the filter screen.

[0027] As an energy storage unit, the spiral spring 702 undergoes elastic deformation to store potential energy when the blade 5 rotates under wind force. When the pawl 704 is stuck in the tooth groove of the ratchet 703, it acts as a limit, allowing the rotating rod 4 to rotate in one direction to tighten the spiral spring 702, preventing it from rebounding when the wind force is insufficient. The push rod 706 acts as a trigger, limiting the push rod 706 to slide vertically up and down through the sliding hole 7041 and the limiting plate 705. When the spiral spring 702 is tightened, the gap between its coils gradually decreases, causing the push rod 706 to slide upward, realizing that the pawl 704 rotates and disengages from the ratchet 703, triggering the instantaneous release of the energy of the spiral spring 702. After the energy is released, the gap between the coils of the spiral spring 702 gradually increases, causing the push rod 706 to slide downward, waiting for the next accumulation cycle.

[0028] Specifically, such as Figure 4 As shown, a connecting plate 8 is installed on the top of the filter screen 2 and the fixing bracket 3. The top of the HVAC pipe 1 is provided with an installation hole 101 that matches the size of the connecting plate 8. The top of the connecting plate 8 is provided with a bolt 9 that is threadedly connected to the HVAC pipe 1. The top of the connecting plate 8 is provided with an insertion hole 801 that matches the size of the filter screen 2.

[0029] To facilitate installation and maintenance, a connecting plate 8 is installed on the top of the filter screen 2 and the fixing frame 3. The filter screen 2, fixing frame 3, scraper 6 and force accumulation triggering mechanism 7 are disassembled by bolts 9. An insertion hole 801 is provided so that the filter screen 2 can be pulled out from the insertion hole 801 without disassembling the entire mechanism, thus realizing quick replacement of the filter screen.

[0030] Specifically, such as Figure 4 and Figure 5 As shown, the bottom of the HVAC pipe 1 has a through hole 102 located at the lower end of the scraper 6. Slide plates 10 are installed at both ends of the bottom of the HVAC pipe 1 and at the through hole 102. A storage box 11 is inserted between the two slide plates 10. A connection hole 1101 corresponding to the position of the through hole 102 is opened on the top of the storage box 11. A baffle 12 is hinged to one end of the connection hole 1101. An arc spring 13 is connected between the bottom end of the baffle 12 near the hinge point and the connection hole 1101.

[0031] When dust accumulates to a certain level, the baffle 12 rotates under force to open the connection hole 1101. The elastic force of the arc spring 13 will cause the baffle 12 to automatically reset, tightly covering the connection hole 1101, preventing airflow short circuit or dust backflow, and ensuring the airtightness of the system.

[0032] In summary, the dust removal device for HVAC systems provided in this embodiment, when used:

[0033] Initial state: The spiral spring 702 is in a relaxed state, and the pawl 704 is stuck in the tooth groove of the ratchet 703 under gravity;

[0034] Energy storage stage: After the HVAC system is started, the airflow inside the HVAC pipe 1 pushes the blade 5, the blade 5 generates rotational torque, which drives the rotating rod 4 to rotate. When the rotating rod 4 rotates, the spiral spring 702 is tightened. This process is carried out slowly and can be achieved even with low wind pressure.

[0035] Triggering phase: When the spiral spring 702 is tightened, it pushes the push rod 706 to slide within the limiting plate 705 and the sliding hole 7041, causing the pawl 704 to rotate, thereby disengaging from the ratchet 703;

[0036] Release phase: Once the pawl 704 disengages, the lock on the ratchet 703 is immediately released, and the elastic potential energy stored in the spiral spring 702 is released violently in an instant, driving the rotating rod 4 to rotate at high speed, which in turn drives the scraper 6 to perform a rapid and thorough impact-type scraping on the surface of the filter screen 2, and the adhering dust is effectively removed.

[0037] Reset and cycle phase: After the dust removal action is completed, the energy of the spiral spring 702 is exhausted and it becomes loose. The gap between its coils increases again. Under the action of gravity, the push rod 706 slides down and returns to the initial position. Subsequently, the pawl 704 also falls back under the action of its reset mechanism and gets into the teeth of the ratchet 703, restoring the locked state.

[0038] Dust collection process: During the entire operation, the dust scraped off by the scraper 6 falls downwards to the through hole 102 at the bottom of the HVAC pipe 1 under the action of gravity. Under the action of the dust's own weight, the baffle 12 on the connection hole 1101 of the storage box 11 is pressed down, allowing the dust to fall into the storage box 11 below through the through hole 102 and the connection hole 1101 for centralized storage. When the operation stops, the baffle 12 automatically resets under the elastic force of the arc spring 13, tightly closing the connection hole 1101 to prevent backflow of air and ensure the airtightness of the system. Users only need to periodically remove the storage box 11 to clean the accumulated dust, achieving maintenance without disassembly.

[0039] The above description of the embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A dust removal device for HVAC systems, comprising HVAC pipes (1), characterized in that, The HVAC pipe (1) contains a filter screen (2) and a fixing frame (3). A rotating rod (4) is rotatably connected to the middle of the fixing frame (3). Multiple blades (5) are arranged in an array at one end of the rotating rod (4) away from the filter screen (2). Multiple scrapers (6) that fit against the filter screen (2) are arranged in an array at the other end of the rotating rod (4). A force accumulation triggering mechanism (7) is provided between the rotating rod (4) and the fixing frame (3). The force accumulation triggering mechanism (7) includes a fixed cylinder (701) installed in the middle of the fixed frame (3), and a spiral spring (702) is connected between the inside of the fixed cylinder (701) and the rotating rod (4). The rotating rod (4) is equipped with a ratchet (703) on the outside of the cavity of the fixed cylinder (701), and a pawl (704) that works with the ratchet (703) rotates inside the fixed cylinder (701). Both ends of the fixed cylinder (701) are equipped with limit plates (705), and the lower end of the pawl (704) is provided with a sliding hole (7041). A push rod (706) that passes through the sliding hole (7041) and the spiral spring (702) is slidably connected between the two limit plates (705).

2. The dust removal device for HVAC according to claim 1, characterized in that, A connecting plate (8) is installed on the top of the filter screen (2) and the fixing frame (3). The top of the heating pipe (1) is provided with an installation hole (101) that matches the size of the connecting plate (8). The top of the connecting plate (8) is provided with a bolt (9) that is threadedly connected to the heating pipe (1).

3. A dust removal device for HVAC according to claim 2, characterized in that, The top of the connecting plate (8) is provided with an insertion hole (801) that matches the size of the filter plate (2).

4. A dust removal device for HVAC according to claim 1, characterized in that, The bottom of the HVAC pipe (1) is provided with a through hole (102) located at the lower end of the scraper (6). Slide plates (10) are installed at both ends of the bottom of the HVAC pipe (1) and at both ends of the through hole (102). A storage box (11) is inserted between the two slide plates (10). A connection hole (1101) corresponding to the position of the through hole (102) is provided at the top of the storage box (11). A baffle (12) is hinged to one end of the connection hole (1101). An arc spring (13) is connected between the bottom end of the baffle (12) near the hinge point and the connection hole (1101).

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