Stable plug-in type glass steel air duct

Abstract

This invention provides a stable plug-in fiberglass duct. A filter vibration shaft extends vertically downwards along the center of the filter screen, and its lower end face is machined into a continuous wavy toothed structure. The fan of the airflow mechanism is an axial flow impeller, with its vibration shaft vertically fixed along the center of the fan hub. An arc-shaped protrusion, matching the wavy toothed surface of the filter vibration shaft, is fixed to the upper end face of the fan vibration shaft. Initially, the filter vibration shaft and the fan vibration shaft are in clearance fit, not in contact; the vibration spring suspends the filter screen at a high position, and a gap exists between the wavy toothed surface of the filter vibration shaft and the arc-shaped protrusion of the fan vibration shaft. When the filter screen becomes clogged to a certain extent, the fan continues to rotate, reducing the airflow through the filter screen. A pressure difference appears on the upper and lower sides of the filter screen, causing the filter screen to move downwards against the spring force of the vibration spring. This causes the wavy toothed surfaces of the fan vibration shaft and the filter vibration shaft to engage, achieving the effect of filter screen vibration and dust removal.

Description

Technical Field

[0001] This invention relates to the field of air conditioning equipment technology, and in particular to a robust plug-in fiberglass duct. Background Technology

[0002] Fiberglass reinforced plastic (FRP) ventilation ducts are widely used in industrial ventilation, exhaust gas emission, and air purification systems due to their corrosion resistance, lightweight, and high strength. To ensure the cleanliness of the exhaust gas or protect downstream equipment, filters are typically installed inside the duct to trap dust particles.

[0003] However, filters inevitably accumulate dust and become clogged during long-term operation, leading to a sharp increase in airflow resistance and a decrease in ventilation efficiency within the duct. In severe cases, this can even cause fan overload or system shutdown. Currently, the main methods for addressing filter clogging are as follows: Firstly, manual periodic shutdowns are required to clean or replace the filters. This method necessitates interrupting production, resulting in high maintenance costs and low efficiency. Furthermore, disassembly and assembly of filters installed inside pipes or at high altitudes are extremely inconvenient, failing to meet the needs of continuous industrial production.

[0004] Secondly, an external air source or reverse air blowing device can be added for reverse purging. This type of solution requires additional compressed air pipelines, solenoid valves, and control systems, which not only makes the structure complex and the modification cost high, but also the reverse airflow can interfere with the airflow stability in the main air duct, and the high-pressure gas may cause impact damage to the filter substrate.

[0005] Third, install an independent electric or electromagnetic vibrator to drive the filter screen vibration. Existing vibration cleaning devices usually rely on an external power source for continuous power supply, and the vibration motor is mostly fixed to the outer wall of the air duct or the filter screen frame. This method has significant drawbacks: on the one hand, once the vibrator is started, it works continuously, regardless of whether the filter screen is actually clogged. Long-term ineffective vibration will lead to filter screen fiber fatigue, loosening of the screen frame connectors, and shorten the service life of the equipment; on the other hand, the excitation force of the external vibration source needs to be transmitted to the filter screen through the air duct wall or support, resulting in large energy loss and difficulty in ensuring uniform amplitude throughout the filter screen, leading to unsatisfactory cleaning effect.

[0006] More importantly, the above-mentioned active cleaning solutions all rely on sensors or manual judgment to identify the filter clogging status. Once the sensor fails or the judgment is delayed, it is very easy to encounter the situation of "not cleaning when clogged" or "forcibly cleaning when not clogged", which leads to a decrease in system reliability.

[0007] To address the shortcomings of existing technologies, this invention provides a robust plug-in fiberglass duct, aiming to solve the technical problems of existing filter cleaning methods, such as complex structure, high energy consumption, inability to adaptively start the cleaning action according to the actual degree of filter clogging, and additional external energy consumption during the cleaning process. Summary of the Invention

[0008] In view of the above problems, the present invention is proposed to provide a robust plug-in fiberglass duct that overcomes or at least partially solves the above problems. It can solve the problems of existing duct filter cleaning methods being complex in structure, high in energy consumption, and unable to adaptively start the cleaning action according to the actual degree of filter clogging, thereby achieving a highly efficient self-cleaning effect for the duct filter.

[0009] Specifically, the present invention provides a stable plug-in fiberglass duct, the stable plug-in fiberglass duct comprising: An airflow duct, wherein the inner wall of the airflow duct is evenly distributed with multiple vibration grooves extending vertically along its axial direction; A filtration mechanism includes a filter screen, multiple vibration springs, and a filter vibration shaft; the filter screen has an extension block that can slide into the vibration groove on its peripheral wall; each vibration spring is installed in one of the vibration grooves and is fixedly connected to the extension block; the upper end of the filter vibration shaft is coaxially fixedly connected to the filter screen, and the lower end face has a wavy toothed surface structure. The flow diversion mechanism includes a flow diversion fan and a fan vibration shaft; the flow diversion fan is rotatably installed inside the airflow duct; the fan vibration shaft is coaxially fixed to the flow diversion fan, and its upper end face is provided with an arc-shaped protrusion that matches the wavy tooth surface of the filter vibration shaft, so that after the filter screen moves downward a preset distance, the wavy tooth surface of the filter vibration shaft fits the arc-shaped protrusion of the fan vibration shaft.

[0010] Optionally, the robust plug-in fiberglass ventilation duct also includes: The flow-dividing mechanism includes a flow-dividing hood, a flow-dividing mesh, a blocking ring, a flow-dividing spring, and a baffle plate. The flow-dividing hood is fixedly sleeved on the outside of the airflow duct, defining a flow-dividing cavity with its outer wall. The flow-dividing cavity is provided with an upper air inlet and a lower air outlet communicating with the inside of the airflow duct. The upper air inlet and the lower air outlet are located on the upper and lower sides of the filter screen, respectively. The blocking ring is installed at the upper air inlet and is used to control the opening and closing of the upper air inlet so that the upper air inlet closes when the blocking ring slides down to a preset position. The flow-dividing spring is used to connect the blocking ring and the airflow duct and is used to store and stretch force when the blocking ring slides down. The baffle plate is fixedly connected to the blocking ring and is located inside the airflow duct. It is used to drive the blocking ring to slide towards the filter screen under the action of airflow thrust. The flow-dividing mesh is disposed in the flow-dividing cavity and is located between the upper air inlet and the lower air outlet.

[0011] Optionally, the upper air inlet is ring-shaped, and a retaining ring groove extends upward from the upper end of the upper air inlet; the retaining ring is slidably inserted into the retaining ring groove; and the diverting spring is installed in the retaining ring groove.

[0012] Optionally, the airflow duct has multiple axially evenly distributed limiting grooves inside, and the limiting grooves are connected to the baffle ring groove; the baffle plate is fixedly connected to the baffle ring through the limiting groove.

[0013] Optionally, the diversion net is composed of two semi-circular ring nets spliced ​​together; the peripheral wall of the diversion hood is provided with an insertion groove; the two semi-circular ring nets can be inserted into the diversion cavity through the insertion groove and assembled into the diversion net.

[0014] Optionally, magnets are provided on the radial edges of the semicircular ring network.

[0015] Optionally, each of the semicircular rings has a handle on its outer arc edge.

[0016] Optionally, the lower air outlet opening area is smaller than the upper air inlet opening area.

[0017] Optionally, the diversion mechanism further includes multiple damping telescopic rods; a mounting boss is provided in the diversion cavity; the damping telescopic rod is vertically fixed on the mounting boss, and its upper end is connected to the blocking ring; the damping telescopic rod is configured to be damped only when it is extended, so as to slow down the upward sliding speed when the blocking ring slides upward.

[0018] Optionally, the diversion mechanism further includes a diversion gear and a diversion motor; the airflow duct is provided with an annular gear mounting groove; the diversion gear is rotatably mounted in the gear mounting groove and fixedly connected to the diversion fan; the diversion motor is mounted on the airflow duct and is gear-driven connected to the diversion gear.

[0019] In the robust plug-in fiberglass duct of the present invention, a vibration spring is vertically installed in each vibration groove, and its upper end is fixedly connected to the extension block, that is, the vibration spring is located below the extension block, and is used to be compressed and store force when the filter screen moves downward. The filter vibration shaft extends vertically and downward along the center position of the filter screen, and the lower end face of the filter vibration shaft is processed into a continuous wavy tooth surface structure.

[0020] The exhaust fan of the exhaust mechanism is an axial flow impeller. The fan's vibration shaft is vertically fixed along the center of the exhaust fan hub. An arc-shaped protrusion, matching the wavy toothed surface of the filter vibration shaft, is fixed to the upper end face of the fan vibration shaft. Initially, the filter vibration shaft and the exhaust fan vibration shaft are in clearance fit, not in contact; the vibration spring suspends the filter screen at a high position, and a gap exists between the wavy toothed surface of the filter vibration shaft and the arc-shaped protrusion of the fan vibration shaft. When the filter screen becomes clogged to a certain extent, the exhaust fan continues to rotate, reducing the airflow through the filter screen. A pressure difference appears on the upper and lower sides of the filter screen, causing the filter screen to move downwards against the spring force of the vibration spring. This causes the wavy toothed surfaces of the fan vibration shaft and the filter vibration shaft to engage, achieving the effect of filter screen vibration and dust removal.

[0021] Utilizing the physical phenomenon of increased pressure difference between upstream and downstream when the filter becomes clogged, the filter automatically moves towards the low-pressure side (the exhaust fan side), causing mechanical engagement between the filter's vibration shaft and the fan's vibration shaft. Once engaged, the continuous rotation of the exhaust fan, through the periodic pushing action of the wave-tooth and arc-shaped protrusions, converts the fan's rotational kinetic energy into high-frequency axial micro-vibration of the filter. This mechanism is a purely mechanical, self-adaptive triggering structure requiring no additional sensors, solenoid valves, or controllers, offering extremely high reliability and maintenance-free operation. Furthermore, the vibration cleaning action automatically intervenes only when the clog reaches a certain level, avoiding ineffective vibration when the filter is only slightly clogged, effectively extending the fatigue life of the mechanical components.

[0022] The above and other objects, advantages and features of the present invention will become more apparent to those skilled in the art from the following detailed description of specific embodiments of the invention in conjunction with the accompanying drawings. Attached Figure Description

[0023] The following sections will describe some specific embodiments of the invention in detail by way of example and not limitation, with reference to the accompanying drawings. The same reference numerals in the drawings denote the same or similar parts or portions. Those skilled in the art should understand that these drawings are not necessarily drawn to scale. In the drawings: Figure 1 This is a schematic structural diagram of a robust plug-in fiberglass ventilation duct according to an embodiment of the present invention; Figure 2 This is a schematic internal structure diagram of a robust plug-in fiberglass ventilation duct according to an embodiment of the present invention; Figure 3 yes Figure 2 A magnified view of a section at point A in the middle; Figure 4 This is a schematic structural diagram of a filter screen in a robust plug-in fiberglass duct according to an embodiment of the present invention; Figure 5 This is a schematic structural diagram of a diversion mesh in a robust plug-in fiberglass duct according to an embodiment of the present invention; Figure 6 This is a schematic structural diagram of the internal structure of an airflow duct in a robust plug-in fiberglass duct according to an embodiment of the present invention; Figure 7 This is a schematic structural diagram of a baffle ring and a baffle plate in a robust plug-in fiberglass duct according to an embodiment of the present invention.

[0024] In the diagram: 100, airflow duct; 110, vibration groove; 120, limiting groove; 130, retaining ring groove; 210, filter screen; 211, extension block; 220, vibration spring; 230, filter vibration shaft; 300, diversion mechanism; 310, diversion fan; 320, fan vibration shaft; 330, diversion gear; 340, diversion motor; 400, flow splitting mechanism; 410, flow splitting hood; 411, insert slot; 420, flow splitting net; 421, semi-circular ring net; 422, magnet; 423, handle; 430, blocking ring; 440, flow splitting spring; 450, baffle plate; 460, flow splitting chamber; 461, upper air inlet; 462, lower air outlet; 470, damping telescopic rod. Detailed Implementation

[0025] The following reference Figures 1 to 7 This invention describes a robust plug-in fiberglass ventilation duct according to embodiments of the present invention. In this description, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature, that is, include one or more of that feature. In the description of the present invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified. When a feature "includes or contains" one or more of the features it encompasses, unless otherwise specifically described, this indicates that other features are not excluded and may be further included.

[0026] Unless otherwise expressly specified and limited, the terms "set up," "install," "connect," "link," "fix," and "couple" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art should be able to understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0027] Furthermore, in the description of this embodiment, "above" or "below" the second feature can include direct contact between the first and second features, or it can include contact between the first and second features through another feature between them. That is, in the description of this embodiment, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," or "below" of the second feature can mean the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0028] In the description of this embodiment, the terms "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0029] Figure 1 This is a schematic structural diagram of a stable plug-in fiberglass ventilation duct, such as... Figure 1 As shown, and with reference Figures 2 to 7 The stable plug-in fiberglass duct includes an airflow duct 100, a filtration mechanism, and a diversion mechanism 300.

[0030] The inner wall of the airflow duct 100 is evenly distributed with multiple vibration grooves 110 extending vertically along its axial direction. The filtration mechanism includes a filter screen 210, multiple vibration springs 220, and a filter vibration shaft 230. The peripheral wall of the filter screen 210 is provided with extension blocks 211 that can slide and insert into the vibration grooves 110. Each vibration spring is installed in one vibration groove 110 and fixedly connected to the extension block 211. The upper end of the filter vibration shaft 230 is coaxially fixedly connected to the filter screen 210, and the lower end face has a wavy toothed structure.

[0031] The airflow diversion mechanism 300 includes an airflow fan 310 and a fan vibration shaft 320. The airflow fan 310 is rotatably installed inside the airflow duct 100. The fan vibration shaft 320 is coaxially fixed to the airflow fan 310, and its upper end face is provided with an arc-shaped protrusion that matches the wavy tooth surface of the filter vibration shaft 230, so that after the filter screen 210 moves downward a preset distance, the wavy tooth surface of the filter vibration shaft 230 fits with the arc-shaped protrusion of the fan vibration shaft 320.

[0032] Specifically, the airflow duct 100 is a cylindrical fiberglass component, and its inner wall is evenly provided with four vertical elongated vibration grooves 110 along the circumference. The filter screen 210 in the filtration mechanism is a circular metal mesh, and its outer edge is welded with the same number of extension blocks 211 as the vibration grooves 110. Each extension block 211 is slidably embedded in the corresponding vibration groove 110.

[0033] Each vibration groove 110 is vertically installed with a vibration spring 220, the upper end of which is fixedly connected to the extension block 211. That is, the vibration spring is located below the extension block 211 and is used to be compressed and store force when the filter screen 210 moves downward. The filter vibration shaft 230 extends vertically and downward along the center position of the filter screen 210, and the lower end face of the filter vibration shaft 230 is processed into a continuous wavy tooth surface structure.

[0034] The diversion fan 310 of the diversion mechanism 300 is an axial flow impeller. The fan vibration shaft 320 is vertically fixed along the center of the hub of the diversion fan 310. An arc-shaped protrusion adapted to the wavy tooth surface of the filter vibration shaft 230 is fixed on the upper end face of the fan vibration shaft 320. In the initial state, the filter vibration shaft 230 and the fan vibration shaft 320 are in clearance fit and do not contact each other. That is, the vibration spring 220 suspends the filter screen 210 at a high position, and there is a gap between the wavy tooth surface of the filter vibration shaft 230 and the arc-shaped protrusion of the fan vibration shaft 320. When the filter screen 210 is blocked to a certain extent, the diversion fan 310 continues to rotate, the airflow through the filter screen 210 decreases, and a pressure difference appears on the upper and lower sides of the filter screen 210. This causes the filter screen 210 to overcome the elastic force of the vibration spring and move downward. This causes the wavy tooth surfaces of the fan vibration shaft 320 and the filter vibration shaft 230 to engage, thereby achieving the effect of vibration cleaning of the filter screen 210.

[0035] Furthermore, the sliding fit between the extension block 211 and the vibration groove 110 provides precise vertical guidance for the filter screen 210, ensuring that the filter screen 210 can only move axially up and down under the action of pressure difference, and ensuring that the filter vibration shaft 230 and the fan vibration shaft 320 are always coaxially aligned. The vibration spring 220 serves as a reset and damping element in this structure. When the filter screen 210 moves downward due to pressure difference, the spring is compressed and stores energy, providing a rebound force for the subsequent reset of the filter screen 210. Simultaneously, the stiffness of the spring determines the pressure difference threshold at which the filter screen 210 starts vibrating. This embodiment utilizes the physical phenomenon of increased upstream and downstream pressure difference after the filter screen 210 becomes clogged as a driving force, causing the filter screen 210 to automatically move towards the low-pressure side (the side of the exhaust fan 310), thereby allowing the filter vibration shaft 230 to mechanically engage with the fan vibration shaft 320. After engagement, the continuous rotation of the duct fan 310, through the periodic pushing action of the wave teeth and arc-shaped protrusions, converts the rotational kinetic energy of the duct fan 310 into high-frequency axial micro-vibration of the filter screen 210. This mechanism is a purely mechanical adaptive trigger structure that requires no additional sensors, solenoid valves, or controllers, exhibiting extremely high reliability and maintenance-free operation. Furthermore, the vibration cleaning action automatically intervenes only when the blockage reaches a certain level, avoiding ineffective vibration when the filter screen 210 has only slight dust accumulation, effectively extending the fatigue life of mechanical components.

[0036] During operation, in the initial cleaning phase: the duct fan 310 operates, and the airflow smoothly passes through the filter screen 210. The pressure difference across the filter screen 210 is minimal, the vibration spring 220 is in a naturally extended or slightly compressed state, and the filter screen 210 remains in its initial high position. At this time, the wavy teeth on the lower end face of the filter vibration shaft 230 are separated from the arc-shaped protrusion on the upper end of the fan vibration shaft 320, with a gap between them, and there is no mechanical contact between the two.

[0037] Clogging and Downward Movement Stage: As filtration progresses, dust gradually accumulates on the windward side (upper surface) of filter 210, increasing its air permeability resistance. The pressure upstream (windward side) of filter 210 increases, while the pressure downstream (leeward side, i.e., the side of the exhaust fan 310) relatively decreases, creating a gradually increasing axial pressure difference. When the downward thrust generated by this pressure difference exceeds the preload of the vibration spring 220, filter 210 begins to move downward against the spring force, the extension block 211 slides down within the vibration groove 110, and the vibration spring 220 is compressed and stores energy. Filter 210 then drives the filter vibration shaft 230 to move downward synchronously.

[0038] Contact engagement stage: When the filter screen 210 moves downward to the preset stroke distance, the wavy toothed surface of the lower end face of the filter vibration shaft 230 and the arc-shaped protrusion of the upper end face of the fan vibration shaft 320 are in close contact and fit into engagement. At this time, the displacement of the filter screen 210 is limited by the limiting structure (or spring compression) to maintain this engagement state.

[0039] Vibration cleaning stage: The induced draft fan 310 rotates continuously, and the fan vibration shaft 320 rotates synchronously. During rotation, the arc-shaped protrusion at its top periodically pushes the wavy toothed surface of the filter vibration shaft 230 upwards, causing the filter screen 210 to be momentarily lifted upwards (further compressing or releasing the spring). As the protrusion passes the crest, the spring force and pressure differential thrust cause the filter screen 210 to rapidly fall back to its original position. Due to the high rotational speed of the induced draft fan 310, this periodic axial impact vibration is transmitted to the entire filter screen 210 in a high-frequency manner, shaking off dust particles embedded in the mesh and adhering to the surface of the filter screen 210.

[0040] Automatic reset phase: After the dust accumulated on the surface of filter screen 210 is shaken off, the air permeability resistance drops sharply, and the pressure difference between the upstream and downstream decreases accordingly. When the downward thrust generated by the pressure difference is insufficient to overcome the compression force of the vibration spring 220, the spring releases energy to push filter screen 210 upward to reset, returning to its initial high position. The filter vibration shaft 230 and the fan vibration shaft 320 disengage again and restore the clearance fit, and the vibration automatically stops, waiting for the next clogging cycle.

[0041] In some embodiments of the present invention, such as Figure 2 , Figure 3 , Figure 6 and Figure 7 As shown, the stable plug-in fiberglass duct also includes a flow-dividing mechanism 400, which includes a flow-dividing hood 410, a flow-dividing screen 420, a baffle ring 430, a flow-dividing spring 440, and a baffle plate 450. The flow-dividing hood 410 is fixedly sleeved on the outside of the airflow duct 100, and the outer wall of the flow-dividing hood 410 defines a flow-dividing cavity 460. The flow-dividing cavity 460 is provided with an upper air inlet 461 and a lower air outlet 462 that communicate with the inside of the airflow duct 100. The upper air inlet 461 and the lower air outlet 462 are located on the upper and lower sides of the filter screen 210, respectively. The baffle ring 430 is installed at the upper air inlet 461 and is used to control the opening and closing of the upper air inlet 461 so that the upper air inlet 461 is closed when the baffle ring 430 slides down to a preset position. The diversion spring 440 connects the baffle ring 430 and the airflow duct 100, and stores and stretches force when the baffle ring 430 slides downward. The baffle plate 450 is fixed to the baffle ring 430 and located inside the airflow duct 100, and is used to drive the baffle ring 430 to slide towards the filter screen 210 under the action of airflow thrust. The diversion screen 420 is disposed in the diversion cavity 460 and located between the upper air inlet 461 and the lower air outlet 462.

[0042] Specifically, a diverter hood 410 is coaxially fitted and fixed to the outer wall of the airflow duct 100. The inner wall of the diverter hood 410 and the outer wall of the airflow duct 100 form an annular diverter cavity 460. The diverter cavity 460 is connected to the interior of the airflow duct 100 through an upper air inlet 461 and a lower air outlet 462. A baffle plate 450 is located above the filter screen 210 (i.e., on the windward side). The baffle plate 450 is annular or fan-shaped, and its outer edge slides against the inner wall of the airflow duct 100 and is fixedly connected to a blocking ring 430. The blocking ring 430 is an annular piston structure and is installed at the upper air inlet 461 to control the opening and closing of the upper air inlet 461. One end of the diversion spring 440 is fixed to the airflow duct 100, and the other end is connected to the blocking ring 430. The diversion spring 440 always applies an upward pulling force to the blocking ring 430, so that the blocking ring 430 is at the uppermost position when it is not subjected to external force, thereby enabling the upper air inlet 461 to be in a closed state.

[0043] Furthermore, when the filter 210 is not clogged, the resistance to airflow passing through it is small, and the airflow velocity remains constant. Airflow above the filter 210 can also pass through it at a high speed. The high-speed airflow directly impacts the baffle 450 located above the filter 210, generating a significant downward aerodynamic thrust. This thrust overcomes the upward pull of the diverting spring 440, pushing the baffle 450 downwards and causing the blocking ring 430 to move synchronously downwards to its lowest position. At this point, the blocking ring 430 completely covers the upper air inlet 461, which is closed, and the diverting spring 440 is stretched and stores energy. All ventilation airflow is forced to pass through the filter 210, which then assumes all the filtering and ventilation functions.

[0044] When the filter screen 210 becomes clogged to a certain extent, the mesh of the filter screen 210 is heavily blocked by dust, and the air permeability resistance increases sharply. This causes the airflow velocity passing through the filter screen 210 to reach the baffle plate 450 to decrease significantly, and the downward aerodynamic thrust applied to the baffle plate 450 decreases accordingly. When this airflow thrust is less than the tension and reset force of the diverter spring 440, the diverter spring 440 contracts and resets, pulling the blocking ring 430 upward, and the upper air inlet 461 is opened. At this time, the induced draft fan 310 continues to operate, forming a negative pressure suction airflow in the channel between the upper air inlet 461 and the lower air outlet 462 in the diversion chamber 460. Part of the airflow bypasses the blocked filter screen 210, enters the diversion chamber 460 from the upper air inlet 461, and then flows back to the airflow duct 100 downstream of the filter screen 210 from the lower air outlet 462. This allows the dust under the vibration of the filter screen 210 to be sucked into the diversion chamber 460 and filtered and cleaned by the diversion net 420, thereby preventing the dust from clogging the filter screen 210 again and improving the dust removal efficiency.

[0045] In some embodiments of the present invention, such as Figure 2 and Figure 6 As shown, the upper air inlet 461 is ring-shaped, and a retaining ring groove 130 extends upward from the upper end of the upper air inlet 461. The retaining ring 430 is slidably inserted into the retaining ring groove 130, and the diverting spring 440 is installed in the retaining ring groove 130.

[0046] Specifically, the upper air inlet 461 is annular, and the inner wall of the diverter shroud 410 extends upward to form a downward-opening retaining ring groove 130. The retaining ring 430 slides vertically into the retaining ring groove 130. A diverter spring 440 is installed between the top of the retaining ring groove 130 and the upper end face of the retaining ring 430. The retaining ring groove 130 ensures that the retaining ring 430 slides vertically, closing downward when unblocked and opening upward when blocked. The retaining ring groove 130 provides guiding accuracy and sealing, and the spring is internally protected.

[0047] In some embodiments of the present invention, such as Figure 3 and Figure 6 As shown, multiple limiting grooves 120 are evenly distributed axially inside the airflow duct 100, and the limiting grooves 120 are connected to the baffle ring grooves 130. The baffle plate 450 is fixedly connected to the baffle ring 430 through the limiting grooves 120.

[0048] Specifically, the airflow duct 100 has multiple axial limiting grooves 120 evenly distributed inside, with the upper end of each limiting groove 120 communicating with a baffle ring groove 130. The baffle plate 450 is fixedly connected to the baffle ring 430 by passing through the limiting groove 120. The limiting groove 120 provides precise guidance for the up-and-down movement of the baffle plate 450 and restricts its circumferential rotation, ensuring that the baffle plate 450 can stably transmit its displacement to the baffle ring 430 in the outer interlayer when impacted by airflow, with synchronized and unobstructed movement.

[0049] In some embodiments of the present invention, such as Figure 3 and Figure 6 As shown, the diversion net 420 is composed of two semi-circular ring nets 421 spliced ​​together. The peripheral wall of the diversion shroud 410 is provided with an insertion slot 411, through which the two semi-circular ring nets 421 can be inserted into the diversion cavity 460 and assembled into the diversion net 420.

[0050] Specifically, a circumferentially extending insertion groove 411 is formed on the circumferential wall of the flow divider 410. The insertion groove 411 penetrates the wall thickness of the flow divider 410 and communicates with the flow divider cavity 460. The flow divider mesh 420 is composed of two identical semi-circular ring meshes 421. During installation, the worker inserts the two semi-circular ring meshes 421 into the flow divider cavity 460 one by one from the insertion groove 411, and splices them together along the circumferential direction in the cavity to form a complete circular annular filter mesh 210, thus dividing the flow divider cavity 460 laterally into upper and lower regions.

[0051] The design, employing two semi-circular ring meshes 421 assembled together, allows the diversion mesh 420 to be replaced, cleaned, or maintained without the need for a complete disassembly and reassembly of the diversion cover 410. The insert slots 411 provide convenient access for installation and removal. This structure significantly reduces maintenance difficulty and downtime, making it particularly suitable for installation environments with limited space or complex piping connections.

[0052] In some embodiments of the present invention, such as Figure 5 As shown, each radial edge of the semicircular ring mesh 421 is provided with a magnet 422. Specifically, in each of the two semicircular ring meshes 421, a bar magnet 422 is embedded and fixed inside the two radial straight edges of each semicircular ring mesh 421, and the magnets 422 on the two semicircular ring meshes 421 have opposite polarities. When the two semicircular ring meshes 421 are spliced ​​in the diversion cavity 460, the magnets 422 on opposite edges attract each other.

[0053] In some embodiments of the present invention, such as Figure 5 As shown, each semicircular ring mesh 421 has a handle 423 on its outer arc edge. Specifically, the handle 423 provides the operator with a clear grip and force application point, making the operation of pulling out the semicircular ring mesh 421 from the insertion slot 411 very effortless and safe.

[0054] In some embodiments of the present invention, such as Figure 6 As shown, the opening area of ​​the lower air outlet 462 is smaller than that of the upper air inlet 461. Specifically, the size of the lower air outlet 462 determines the airflow volume through the diversion chamber 460. Therefore, the smaller opening of the lower air outlet 462 prevents excessive airflow in the diversion chamber 460, thereby increasing the airflow velocity above the filter 210. Thus, the smaller area of ​​the lower air outlet 462 ensures negative pressure suction in the diversion chamber 460 while minimizing the impact on the pressure above the filter 210, preventing the filter 210 from rebounding and the baffle 450 from being pressed down by the airflow from the diversion chamber 460.

[0055] In some embodiments of the present invention, such as Figure 2 and Figure 7 As shown, the diversion mechanism 400 also includes a plurality of damping telescopic rods 470. A mounting boss is provided within the diversion cavity 460. The damping telescopic rods 470 are vertically fixed to the mounting boss, with their upper ends connected to the blocking ring 430. The damping telescopic rods 470 are configured to be damped only when extended, so as to reduce the upward sliding speed when the blocking ring 430 slides upward.

[0056] Specifically, the inner wall of the diversion cavity 460 has a ring-shaped mounting boss near the upper air inlet 461. Four damping telescopic rods 470 are vertically fixed to the mounting boss, and the damping telescopic rods 470 are evenly distributed along the circumference. The upper end of each damping telescopic rod 470 is fixedly connected to the lower end face of the blocking ring 430. The damping telescopic rod 470 is an oil-filled or air-filled single-acting damper.

[0057] The damping telescopic rod 470 provides a one-way buffer function. When the blocking ring 430 moves rapidly downward to close the air vent due to the airflow thrust, the damping telescopic rod 470 does not generate additional resistance, ensuring the rapid response and timely closure of the air vent. When the airflow thrust disappears and the diversion spring 440 drives the blocking ring 430 to quickly return to its original position, the extension damping effect of the damping telescopic rod 470 slows down the upward sliding speed of the blocking ring 430, preventing the blocking ring 430 from violently impacting the top of the ring groove 130 or the limiting structure, thereby effectively eliminating impact noise. At the same time, it can extend the opening time of the upper air inlet 461, preventing the upper air inlet 461 from suddenly opening completely, causing the airflow above the filter 210 to decrease, which in turn causes the filter 210 to rebound, resulting in a deterioration in the vibration effect of the filter 210.

[0058] In some embodiments of the present invention, such as Figure 2 As shown, the diversion mechanism 300 also includes a diversion gear 330 and a diversion motor 340; the airflow duct 100 is provided with an annular gear mounting groove; the diversion gear 330 is rotatably mounted in the gear mounting groove and fixedly connected to the diversion fan 310; the diversion motor 340 is mounted on the airflow duct 100 and is gear-driven connected to the diversion gear 330.

[0059] Therefore, those skilled in the art should recognize that although numerous exemplary embodiments of the present invention have been shown and described in detail herein, many other variations or modifications conforming to the principles of the present invention can be directly determined or derived from the disclosure of the present invention without departing from the spirit and scope of the invention. Thus, the scope of the present invention should be understood and construed as covering all such other variations or modifications.

Claims

1. A stable plug-in fiberglass ventilation duct, characterized in that, include: An airflow duct, wherein the inner wall of the airflow duct is evenly distributed with multiple vibration grooves extending vertically along its axial direction; A filtration mechanism includes a filter screen, multiple vibration springs, and a filter vibration shaft; the filter screen has an extension block that can slide into the vibration groove on its peripheral wall; each vibration spring is installed in one of the vibration grooves and is fixedly connected to the extension block; the upper end of the filter vibration shaft is coaxially fixedly connected to the filter screen, and the lower end face has a wavy toothed surface structure. The flow diversion mechanism includes a flow diversion fan and a fan vibration shaft; the flow diversion fan is rotatably installed inside the airflow duct; the fan vibration shaft is coaxially fixed to the flow diversion fan, and its upper end face is provided with an arc-shaped protrusion that matches the wavy tooth surface of the filter vibration shaft, so that after the filter screen moves downward a preset distance, the wavy tooth surface of the filter vibration shaft fits the arc-shaped protrusion of the fan vibration shaft.

2. The stable plug-in fiberglass ventilation duct according to claim 1, characterized in that, Also includes: The flow-dividing mechanism includes a flow-dividing hood, a flow-dividing mesh, a blocking ring, a flow-dividing spring, and a baffle plate. The flow-dividing hood is fixedly sleeved on the outside of the airflow duct, defining a flow-dividing cavity with its outer wall. The flow-dividing cavity is provided with an upper air inlet and a lower air outlet communicating with the inside of the airflow duct. The upper air inlet and the lower air outlet are located on the upper and lower sides of the filter screen, respectively. The blocking ring is installed at the upper air inlet and is used to control the opening and closing of the upper air inlet so that the upper air inlet closes when the blocking ring slides down to a preset position. The flow-dividing spring is used to connect the blocking ring and the airflow duct and is used to store and stretch force when the blocking ring slides down. The baffle plate is fixedly connected to the blocking ring and is located inside the airflow duct. It is used to drive the blocking ring to slide towards the filter screen under the action of airflow thrust. The flow-dividing mesh is disposed in the flow-dividing cavity and is located between the upper air inlet and the lower air outlet.

3. The stable plug-in fiberglass ventilation duct according to claim 2, characterized in that, The upper air inlet is ring-shaped, and a retaining ring groove extends upward from the upper end of the upper air inlet; the retaining ring is slidably inserted into the retaining ring groove; the diverting spring is installed in the retaining ring groove.

4. The stable plug-in fiberglass ventilation duct according to claim 3, characterized in that, The airflow duct has multiple axially evenly distributed limiting grooves inside, and the limiting grooves are connected to the baffle ring groove; the baffle plate is fixedly connected to the baffle ring through the limiting groove.

5. The stable plug-in fiberglass ventilation duct according to claim 2, characterized in that, The diversion mesh is composed of two semi-circular ring meshes spliced ​​together; the peripheral wall of the diversion hood is provided with an insertion groove; the two semi-circular ring meshes can be inserted into the diversion cavity through the insertion groove and assembled into the diversion mesh.

6. The stable plug-in fiberglass ventilation duct according to claim 5, characterized in that, Magnets are provided on the radial edges of the semicircular ring network.

7. The stable plug-in fiberglass ventilation duct according to claim 5, characterized in that, Each of the semicircular rings has a handle on its outer arc edge.

8. The stable plug-in fiberglass ventilation duct according to claim 2, characterized in that, The lower air outlet opening is smaller than the upper air inlet opening area.

9. The stable plug-in fiberglass ventilation duct according to claim 2, characterized in that, The diversion mechanism also includes multiple damping telescopic rods; a mounting boss is provided in the diversion cavity; the damping telescopic rod is vertically fixed on the mounting boss, and its upper end is connected to the blocking ring; the damping telescopic rod is configured to be damped only when it is extended, so as to slow down the upward sliding speed when the blocking ring slides upward.

10. The stable plug-in fiberglass ventilation duct according to claim 1, characterized in that, The flow diversion mechanism also includes a flow diversion gear and a flow diversion motor; the airflow duct is provided with an annular gear mounting groove; the flow diversion gear is rotatably installed in the gear mounting groove and fixedly connected to the flow diversion fan; the flow diversion motor is installed on the airflow duct and is connected to the flow diversion gear via gear transmission.

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