A non-destructive connecting device for a wind turbine

Abstract

The present application relates to the technical field of wind pipe installation, and discloses a wind pipe nondestructive connecting device, which comprises a connecting cylinder for connecting a wind pipe cloth, a mounting cylinder, one end of which is connected with the connecting cylinder through a first elastic piece, and the other end of which is used for connecting a fan or another connecting cylinder, wherein the connecting cylinder is movable along the axial direction of the mounting cylinder between a first position and a second position; when the connecting cylinder moves between the first position and the second position, the connecting cylinder moves along the axial direction of the mounting cylinder and rotates clockwise or counterclockwise along the circumferential direction of the mounting cylinder. The present application solves the technical problem that the wind pipe connection in the related art cannot effectively buffer the connection loosening caused by the downhole vibration and the wind pressure fluctuation.

Description

Technical Field

[0001] This invention relates to the field of ventilation duct installation technology, and in particular to a non-destructive connection device for ventilation ducts. Background Technology

[0002] A ventilation duct is a flexible pipe used in ventilation systems for confined spaces such as underground coal mines and tunnels. It is usually made of flame-retardant and anti-static coated fabric. Its main function is to guide fresh air delivered by local ventilation fans along the roadway to the tunneling or mining face to dilute methane, reduce dust concentration, and ensure the breathing safety of workers. It can also be used to exhaust harmful gases such as carbon monoxide.

[0003] A ventilation duct connection device is a specialized component used in ventilation systems such as those in underground coal mines and tunnels to quickly and reliably connect two flexible ventilation ducts or ventilation ducts to the outlet of a fan. Currently, existing ventilation duct connection devices are unable to effectively buffer loosening of connections caused by underground vibrations and fluctuations in air pressure, leading to easy failure of their seals and the creation of air leakage channels. Summary of the Invention

[0004] This application discloses a non-destructive connection device for ventilation ducts to solve the technical problems of ventilation duct connections in related technologies, such as the difficulty in effectively buffering the loosening of connections caused by downhole vibrations and the fluctuation of air pressure.

[0005] To solve the above problems, the present invention adopts the following technical solution: A non-destructive connection device for ventilation ducts, comprising: Connecting tube, used to connect the duct fabric; The mounting cylinder has one end connected to the connecting cylinder via a first elastic element, and the other end is used to connect to a fan or another connecting cylinder. The connecting cylinder can move between a first position and a second position along the axial direction of the mounting cylinder; when the connecting cylinder moves between the first position and the second position, the connecting cylinder moves along the axial direction of the mounting cylinder and rotates clockwise or counterclockwise along the circumference of the mounting cylinder.

[0006] In some solutions, the non-destructive connection device for the air duct includes a limiting component that abuts against the connecting tube when the connecting tube is in the first position, thereby limiting the movement of the connecting tube. When the force on the connecting cylinder exceeds the threshold, the limiting component separates from the connecting cylinder.

[0007] In some designs, the inner wall of the mounting cylinder is provided with a groove, and the outer side of the connecting cylinder is provided with a limiting protrusion; the limiting protrusion is embedded in the groove and can move along the extension direction of the groove. Both ends of the chute extend circumferentially toward the end furthest from the connecting cylinder along the mounting cylinder.

[0008] In some designs, the limiting assembly includes a connecting flange and a telescopic component. The connecting flange is located on the end face of the mounting cylinder, and the telescopic component is located inside the mounting cylinder and connected to the connecting flange. When the connecting cylinder is in the first position, the telescopic component and the limiting protrusion abut against each other; when the force on the connecting cylinder exceeds the threshold, the limiting protrusion separates from the telescopic component.

[0009] In some designs, the groove includes a locking portion and two sliding portions, which are located on opposite sides of the locking portion and extend circumferentially toward the end away from the connecting cylinder. The locking portion is used to restrict the movement of the connecting cylinder in a first position, and the connecting cylinder can be forcefully separated from the locking portion.

[0010] In some designs, the telescopic component includes a rod, a second elastic element, and a stop block. The rod is connected to a connecting flange, and the stop block is used to stop against a limiting protrusion and is slidably connected to the rod via the second elastic element.

[0011] In some designs, the snap-fit ​​portion has a first arcuate surface recessed on the side away from the connecting cylinder.

[0012] In some designs, the stop block has a second arc-shaped surface corresponding to the limiting protrusion, and the second arc-shaped surface is recessed towards the side closer to the connecting cylinder; And / or, guide surfaces are provided on both sides of the stop block, and the guide surfaces are used to guide the sliding of the limiting protrusion; And / or, the inner wall of the mounting cylinder is provided with a mounting groove that communicates with the slide groove, and the rod is embedded in the mounting groove; And / or, the rod body has a guide groove extending through one end away from the connecting flange, a second elastic element is installed in the guide groove, a stop block is embedded in the guide groove, and can move along the extension direction of the guide groove.

[0013] In some designs, the non-destructive connection device for the ventilation duct also includes damping components, which are located at both ends of the slide.

[0014] In some designs, the damping assembly includes a damping block and a third elastic element. The damping block is disposed at the end of the groove, and the third elastic element is sleeved on the damping block, or the third elastic element is disposed inside the damping block.

[0015] The technical solution adopted in this invention can achieve the following beneficial effects: The non-destructive connection device for ventilation ducts disclosed in this application comprises an installation cylinder, one end of which is elastically connected to a connecting cylinder via a first elastic element, and the other end of which is fixedly connected to a fan or another connecting cylinder. Under external force, the connecting cylinder can move axially between a first position and a second position along the installation cylinder, and simultaneously rotates clockwise or counterclockwise along the circumference of the installation cylinder during this movement. The first elastic element provides buffer stroke and reset force, enabling the connecting cylinder to flexibly absorb energy when subjected to downhole vibration or wind pressure impact, and automatically reset after the external force is removed. Through the combined motion of axial movement and synchronous bidirectional circumferential rotation of the connecting cylinder, the impact generated by downhole vibration and wind pressure fluctuations can be adaptively absorbed, avoiding loosening of the connection interface due to pure axial hard collision or pure circumferential jamming, significantly improving the reliability, sealing durability, and installation efficiency of the connection. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is an isometric view of a non-destructive connection device for a ventilation duct disclosed in some embodiments of this application; Figure 2 This is a top view of the non-destructive connection device for air ducts disclosed in some embodiments of this application; Figure 3 yes Figure 2 A sectional view of plane aa in the middle; Figure 4 This is a schematic diagram of the cooperation between the connecting cylinder and the limiting component disclosed in some embodiments of this application; Figure 5 This is an isometric view of the limiting component disclosed in some embodiments of this application; Figure 6 yes Figure 5 Enlarged view of point A in the middle; Figure 7 This is a bottom view of the limiting component disclosed in some embodiments of this application; Figure 8 yes Figure 7 A sectional view of the middle bb plane; Figure 9 This is an isometric view of the mounting cylinder disclosed in some embodiments of this application; Figure 10 This is a top view of the mounting cylinder disclosed in some embodiments of this application; Figure 11 yes Figure 10 A sectional view of the cc plane.

[0018] In the picture: 100 - Connecting cylinder; 110 - Limiting protrusion; 200-Mounting cylinder, 210-Sliding groove, 211-Sliding part, 212-Snap-fit ​​part, 2121-First arc-shaped surface, 220-Mounting groove, 230-First elastic element; 300-Limiting component, 310-Connecting flange, 320-Telescopic component, 321-Rod, 3211-Guide groove, 322-Stop block, 3221-Second arc surface, 3222-Guide surface, 323-Second elastic component; 400-Damping component. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be described in detail below. Obviously, the described embodiments are merely some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other implementation methods obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0020] The terms "first," "second," etc., used in the specification and claims of this application are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such use of data can be interchanged where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class and the number of objects is not limited; for example, a first object can be one or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0021] During the maintenance of ventilation ducts, the inventors discovered that existing ventilation duct connection devices (such as wire binding, rigid clamps, or zippers) typically employ rigid fixing methods, lacking specialized elastic damping elements and adaptive clamping mechanisms. Therefore, they are ineffective at buffering the wide-frequency vibrations generated by underground blasting, fan start-up and shutdown, and vehicle traffic. These vibrations are directly transmitted to the ventilation duct fabric and sealing interface through the connectors, causing slight relative displacement or localized loosening of the originally compressed contact surface. Repeated vibrations can even lead to loosening of binding points and displacement of clamps. Simultaneously, the tunnel air pressure is not constant but fluctuates with fan operating conditions and ventilation resistance. Rigid connections cannot dynamically adjust the clamping force of the sealing surface according to air pressure changes. When air pressure drops suddenly, insufficient rebound of the sealing ring creates gaps; when air pressure rises suddenly, it may blow open any unlocked connections. Thus, the combined effect of vibration and air pressure fluctuations keeps the sealing interface of traditional connections in a continuous unstable cycle of micro-movement, loosening, and re-tightening, ultimately leading to wear, fatigue, or partial detachment of the sealing ring, forming irreversible leakage channels, causing airflow loss and safety hazards.

[0022] The following is in conjunction with the appendix Figures 1 to 11 The present application provides a detailed description of a non-destructive connection device for a ventilation duct through specific embodiments and application scenarios.

[0023] Some embodiments of this application disclose a non-destructive connection device for a wind tunnel, including a connecting tube 100, a mounting tube 200, a limiting component 300, and a damping component 400.

[0024] like Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, the connecting cylinder 100 is used to connect the duct fabric. By setting an independent connecting cylinder 100 to connect with the duct fabric, a stable fixation can be achieved without damaging the duct fabric body, and a reliable interface can be provided for subsequent connection with the mounting cylinder 200.

[0025] In some embodiments, the outer wall of the end of the connecting cylinder 100 is coated with a flexible adhesive, the end of the duct cloth is fitted and bonded, and after curing, an airtight and flexible connection interface is formed, thereby completing the fixation of the connecting cylinder 100 and the duct cloth.

[0026] In some embodiments, the duct cloth is fitted onto the outer wall of the connecting cylinder 100, a rubber pad is wrapped around the outside, and then the pad and the duct cloth are pressed together onto the connecting cylinder 100 using a split clamp, thereby completing the fixation of the connecting cylinder 100 and the duct cloth.

[0027] like Figure 1 and Figure 3As shown, one end of the mounting cylinder 200 is connected to the connecting cylinder 100 through a first elastic element 230, and the other end is used to connect to a fan or another connecting cylinder 100; the connecting cylinder 100 can move between a first position and a second position along the axial direction of the mounting cylinder 200; when the connecting cylinder 100 moves between the first position and the second position, the connecting cylinder 100 moves along the axial direction of the mounting cylinder 200 and rotates clockwise or counterclockwise along the circumference of the mounting cylinder 200. One end of the mounting cylinder 200 is elastically connected to the connecting cylinder 100 via the first elastic element 230, and the other end is fixedly connected to a blower or another connecting cylinder 100. Under the action of external force, the connecting cylinder 100 can move between the first position and the second position along the axial direction of the mounting cylinder 200, and rotate clockwise or counterclockwise along the circumference of the mounting cylinder 200 during this movement. The first elastic element 230 provides buffer stroke and reset force, so that the connecting cylinder 100 can flexibly absorb energy when subjected to downhole vibration or wind pressure impact, and automatically reset after the external force is removed, thereby achieving adaptive locking and separation between the connecting cylinder 100 and the mounting cylinder 200 without tools.

[0028] When broadband vibrations occur during underground blasting, ventilation fan start-up and shutdown, or vehicle traffic, these vibrations are transmitted to the mating interface between the mounting cylinder 200 and the connecting cylinder 100 in the form of axial impact, radial disturbance, and torsional waves. If the connecting cylinder 100 can only move axially and cannot rotate (i.e., a purely axial rigid connection), the axial impact will directly cause a violent rigid collision between the connecting cylinder 100 and the mounting cylinder 200, resulting in a momentary separation gap or, in severe cases, plastic deformation or jamming of the mating surface. If the connecting cylinder 100 can only rotate circumferentially and cannot move axially (i.e., a purely circumferential constrained connection), radial or torsional vibrations will cause the connecting cylinder 100 to wobble or become stuck, unable to release the axial compressive energy, leading to localized wear or loosening of the connection interface due to stress concentration.

[0029] In this embodiment, the combined motion of the connecting cylinder 100 and the mounting cylinder 200 involves the connecting cylinder 100 simultaneously undergoing bidirectional circumferential rotation (clockwise or counterclockwise) during axial movement. This combined motion decomposes the complex impacts generated by vibration and wind pressure fluctuations into translational components along the axial direction of the mounting cylinder 200 and rotational components along the circumferential direction. When an axial impact occurs, the connecting cylinder 100 does not rigidly resist it but moves a certain distance along the axial direction, while simultaneously converting some of the impact energy into rotational kinetic energy through helical rotation, thereby avoiding stress concentration at a single point. When radial or torsional vibrations occur, the bidirectional rotation allows the connecting cylinder 100 to automatically follow the vibration direction and make slight rotational adjustments, eliminating jamming caused by skewness. Furthermore, the axial thrust caused by wind pressure fluctuations also drives the connecting cylinder 100 to rotate in the corresponding direction during axial movement, ensuring that the connecting cylinder 100 is always in a dynamic following state rather than rigidly locked. This composite motion method is equivalent to introducing an adaptive flexible buffer at the connection interface, which smoothly dissipates the sudden impact energy into the motion process, thereby avoiding loosening caused by pure axial hard collision and locking caused by pure circumferential jamming, and thus effectively buffering the connection loosening and wind pressure fluctuations caused by downhole vibration.

[0030] In some embodiments, the other end of the mounting cylinder 200 is used to connect to a fan. As a direct adapter between the fan and the duct, the mounting cylinder 200, through the buffer stroke and restoring force provided by the first elastic element 230, absorbs the vibration and wind pressure fluctuations generated by the fan's start-up, shutdown, or operation through the elastic fit between the mounting cylinder 200 and the connecting cylinder 100, preventing the vibration from being directly transmitted to the duct fabric. At the same time, the connecting cylinder 100 can move axially and rotate circumferentially along the mounting cylinder 200, so that the connection between the fan outlet and the duct can be quickly locked or separated without any tools, and can adaptively adjust the relative position, reducing the installation alignment requirements.

[0031] In some embodiments, the other end of the mounting cylinder 200 is also connected to another connecting cylinder 100 via a first elastic member 230. The mounting cylinder 200 serves to extend and segment the ventilation duct. When long-distance ventilation is required, the duct can be divided into several sections, with a connecting cylinder 100 fixed at the end of each section. Adjacent connecting cylinders 100 are connected by the mounting cylinder 200. This avoids the difficulties in handling, installation, and recycling caused by excessively long single-section ventilation ducts. At the same time, the two ends of the mounting cylinder 200 are respectively engaged with two connecting cylinders 100, allowing each section of the ventilation duct to move axially and rotate circumferentially independently when subjected to underground vibration or wind pressure fluctuations, without interfering with each other. This disperses stress and prevents local tearing or loosening caused by the overall rigid connection.

[0032] In this preferred embodiment, the first elastic element 230 is a helical spring.

[0033] like Figure 3 and Figure 4 As shown, when the connecting cylinder 100 is in the first position, the limiting component 300 abuts against the connecting cylinder 100 to restrict its movement; when the force on the connecting cylinder 100 exceeds a threshold, the limiting component 300 separates from the connecting cylinder 100. By limiting the connecting cylinder 100 in the first position with the limiting component 300 abutting, the connecting cylinder 100 can be reliably locked under normal working conditions (such as static placement or small-amplitude vibration), preventing it from moving or disengaging unexpectedly; when the external force applied by downhole blasting, blower impact, or human operation exceeds a preset threshold, the limiting component 300 can automatically separate from the connecting cylinder 100, allowing the connecting cylinder 100 to move axially along the mounting cylinder 200 and rotate circumferentially, thereby avoiding plastic deformation or jamming damage to the connecting cylinder 100 or mounting cylinder 200 due to excessive external force. At the same time, it realizes automatic unlocking and buffering under overload conditions, taking into account both stable locking under normal conditions and safety protection under abnormal conditions.

[0034] like Figure 9 , Figure 10 and Figure 11 As shown, the inner wall of the mounting cylinder 200 is provided with a groove 210, and the outer side of the connecting cylinder 100 is provided with a limiting protrusion 110. The limiting protrusion 110 is embedded in the groove 210 and can move along the extension direction of the groove 210. The two ends of the groove 210 extend circumferentially away from the connecting cylinder 100 along the mounting cylinder 200. By interlocking the groove 210 on the inner wall of the mounting cylinder 200 with the limiting protrusion 110 on the outer side of the connecting cylinder 100, the limiting protrusion 110 is forced to move along the extension direction of the groove 210 when the connecting cylinder 100 moves axially. Since the two ends of the groove 210 extend circumferentially away from the connecting cylinder 100 along the mounting cylinder 200, the movement trajectory of the limiting protrusion 110 is forcibly converted into a spiral, thereby driving the connecting cylinder 100 to rotate clockwise or counterclockwise circumferentially at the same time as moving axially. This design ensures a definite guiding relationship between the relative movement of the connecting cylinder 100 and the mounting cylinder 200, enabling the coupling of axial displacement and circumferential rotation without the need for additional locking elements. This limits the range of motion of the connecting cylinder 100 (with the two ends being the extreme positions) while allowing bidirectional rotation to adapt to different operations or force directions, thereby simplifying the structure and improving the smoothness and reliability of the connection and separation process.

[0035] Specifically, such as Figure 11 As shown, the slide groove 210 includes a locking part 212 and two sliding parts 211. The two sliding parts 211 are disposed on opposite sides of the locking part 212 and extend along the circumference of the connecting cylinder 100 toward the end away from the connecting cylinder 100. The locking part 212 is used to restrict the movement of the connecting cylinder 100 in a first position, and the connecting cylinder 100 can be separated from the locking part 212 by force.

[0036] When the connecting cylinder 100 is in the first position, its external limiting protrusion 110 is embedded in the locking portion 212 of the sliding groove 210. The locking portion 212 stops the limiting protrusion 110, thereby restricting the connecting cylinder 100 from continuing to move axially. When the connecting cylinder 100 is subjected to an external force exceeding a preset threshold, the limiting protrusion 110 overcomes the constraint of the locking portion 212 and separates from the locking portion 212, enters one of the sliding portions 211, and moves along the extension direction of the sliding portion 211, eventually reaching the end dead point position of the sliding portion 211 (the second position). Since the sliding portion 211 extends circumferentially away from the end of the connecting cylinder 100 along the mounting cylinder 200, the limiting protrusion 110 is forced to move along a spiral trajectory during the movement, thereby driving the connecting cylinder 100 to rotate clockwise or counterclockwise circumferentially at the same time as moving axially.

[0037] The locking part 212 provides a stable first position locking function for the connecting cylinder 100, preventing it from moving accidentally in non-working state or under slight vibration; the two symmetrical sliding parts 211 allow the connecting cylinder 100 to move axially and rotate circumferentially in both clockwise and counterclockwise directions after being subjected to force, realizing bidirectional unlocking and motion guidance; when the external force exceeds the threshold, it automatically separates, which not only ensures reliable locking under normal conditions, but also avoids structural damage or jamming caused by overload. At the same time, unlocking and compound movement can be completed without any tools, which significantly improves the reliability and adaptability of the connection.

[0038] Specifically, such as Figure 11 As shown, the locking part 212 has a first arc-shaped surface 2121 recessed on the side away from the connecting cylinder 100. The first arc-shaped surface 2121, through its recessed structure, allows the limiting protrusion 110 to form a curved surface fit during locking, which not only improves locking stability but also guides the limiting protrusion 110 to slide out smoothly when the force exceeds the threshold, avoiding jamming or impact damage.

[0039] like Figure 3 , Figure 4 and Figure 5As shown, the limiting assembly 300 includes a connecting flange 310 and a telescopic member 320. The connecting flange 310 is disposed on the end face of the mounting cylinder 200, and the telescopic member 320 is located inside the mounting cylinder 200 and connected to the connecting flange 310. When the connecting cylinder 100 is in the first position, the telescopic member 320 abuts against the limiting protrusion 110. When the force on the connecting cylinder 100 exceeds a threshold, the limiting protrusion 110 separates from the telescopic member 320. The connecting flange 310 is fixed to the end face of the mounting cylinder 200. One end of the telescopic member 320 is connected to the connecting flange 310, and the other end forms a stop contact with the limiting protrusion 110 on the outside of the connecting cylinder 100 when the connecting cylinder 100 is in the first position, thereby restricting the movement of the connecting cylinder 100. When the external force on the connecting cylinder 100 exceeds a preset threshold, the lateral or axial force applied by the limiting protrusion 110 to the telescopic member 320 overcomes its holding force, causing the telescopic member 320 to compress, deflect, or retract, thereby separating from the limiting protrusion 110 and releasing the constraint on the connecting cylinder 100. The elastic or movable stop of the telescopic member 320 achieves reliable locking under normal conditions and automatic unlocking under overload, preventing the connecting cylinder 100 from accidentally disengaging in a non-working state or under slight vibration, and avoiding plastic deformation or jamming of the connecting cylinder 100 or the mounting cylinder 200 due to excessive external force.

[0040] like Figure 3 , Figure 4 , Figure 5 and Figure 8 As shown, the telescopic member 320 includes a rod 321, a second elastic element 323, and a stop block 322. The rod 321 is connected to the connecting flange 310. The stop block 322 is used to stop against the limiting protrusion 110 and is slidably connected to the rod 321 through the second elastic element 323. The rod 321 is fixed to the connecting flange 310, and the stop block 322 is slidably connected to the rod 321 through the second elastic element 323. Under normal conditions, the second elastic element 323 pushes the stop block 322 to a position where it stops against the limiting protrusion 110 outside the connecting cylinder 100, thereby restricting the movement of the connecting cylinder 100 in the first position. When the connecting cylinder 100 is subjected to an external force exceeding a threshold, the limiting protrusion 110 squeezes the stop block 322, causing the stop block 322 to compress the second elastic element 323 and slide back along the rod 321, thereby separating from the limiting protrusion 110 and releasing the constraint on the connecting cylinder 100. The rod 321 provides guidance, the second elastic element 323 provides a resettable preload, and the stop block 322 directly bears the contact load. This achieves flexible contact and automatic separation from overload between the stop block 322 and the limiting protrusion 110, ensuring reliable locking under normal working conditions and smoothing out locking when the force exceeds the threshold, thus avoiding structural damage caused by hard impact.

[0041] In this preferred embodiment, the second elastic element 323 is a helical spring.

[0042] In this embodiment, as Figure 6 As shown, the stop block 322 has a second arc-shaped surface 3221 corresponding to the limiting protrusion 110, and the second arc-shaped surface 3221 is recessed towards the side close to the connecting cylinder 100. The second arc-shaped surface 3221 forms a curved surface fit with the limiting protrusion 110, which improves the locking stability and guides the limiting protrusion 110 to slide out smoothly when the force exceeds the threshold, avoiding jamming or impact damage.

[0043] In this embodiment, as Figure 6 As shown, guide surfaces 3222 are provided on both sides of the stop block 322. The guide surfaces 3222 are used to guide the sliding of the limiting protrusion 110. The guide surfaces 3222 provide a smooth guiding path when the limiting protrusion 110 contacts or separates from the stop block 322, reducing friction and jamming, and ensuring smooth bidirectional movement.

[0044] In this embodiment, as Figure 9 , Figure 10 and Figure 11 As shown, the inner wall of the mounting cylinder 200 is provided with a mounting groove 220 that communicates with the sliding groove 210, and the rod 321 is embedded in the mounting groove 220. By embedding the rod 321 into the mounting groove 220 on the inner wall of the mounting cylinder 200, the rod 321 is reliably positioned and fixed, while avoiding the occupation of extra space and simplifying the assembly structure.

[0045] In this embodiment, as Figure 8 As shown, the rod body 321 has a guide groove 3211 extending through one end away from the connecting flange 310. The second elastic element 323 is installed in the guide groove 3211, and the stop block 322 is embedded in the guide groove 3211 and can move along the extension direction of the guide groove 3211. The guide groove 3211 provides a precise linear motion track for the stop block 322 and is coaxially arranged with the second elastic element 323 to ensure the centering of the stop block 322 during compression and reset, thereby improving the smoothness and reliability of the movement.

[0046] like Figure 3 and Figure 11 As shown, damping components 400 are respectively provided at both ends of the slide groove 210. With damping components 400 provided at both ends of the slide groove 210, when the limiting protrusion 110 of the connecting cylinder 100 moves to the first position or the second position, the damping components 400 can absorb the impact energy between the limiting protrusion 110 and the end of the slide groove 210, avoiding wear, noise or structural damage caused by rigid collision, and at the same time providing a smooth limit stop and reverse start transition for the connecting cylinder 100, thereby improving the smoothness of reciprocating motion and extending the service life of the device.

[0047] The damping assembly 400 includes a damping block and a third elastic element. The damping block is disposed at the end of the slide groove 210, and the third elastic element is sleeved on the damping block, or disposed within the damping block. When the limiting protrusion 110 moves to the end of the slide groove 210, the damping block first bears the impact, while the third elastic element is compressed to absorb kinetic energy, thereby converting the rigid collision into elastic buffering. Both arrangements of the third elastic element (sleeved or embedded) can provide uniform elastic support, preventing the damping block from tilting or jamming, and the embedded arrangement can also save radial space. Through the setting of the damping block and the third elastic element, the impact energy of the limiting protrusion 110 and the end of the slide groove 210 is effectively absorbed, avoiding noise, wear or structural damage caused by hard collisions. At the same time, it provides a smooth limit stop and reverse start transition for the connecting cylinder 100, significantly improving the smoothness of reciprocating motion and the service life of the device.

[0048] In this embodiment, the damping block is preferably a rubber block, and the third elastic element is preferably a helical spring.

[0049] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0050] Furthermore, it should be noted that the scope of the methods and apparatus in the embodiments of this application is not limited to performing functions in the order shown or discussed, but may also include performing functions substantially simultaneously or in the reverse order, depending on the functions involved. For example, the described methods may be performed in a different order than described, and various steps may be added, omitted, or combined. In addition, features described with reference to certain examples may be combined in other examples.

[0051] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention.

Claims

1. A non-destructive connection device for ventilation ducts, characterized in that, include: Connecting tube, used to connect the duct fabric; The mounting cylinder has one end connected to the connecting cylinder via a first elastic element, and the other end is used to connect to a fan or another connecting cylinder. The connecting cylinder can move between a first position and a second position along the axial direction of the mounting cylinder; when the connecting cylinder moves between the first position and the second position, the connecting cylinder moves along the axial direction of the mounting cylinder and rotates clockwise or counterclockwise along the circumference of the mounting cylinder. The inner wall of the mounting cylinder is provided with a sliding groove, and the outer side of the connecting cylinder is provided with a limiting protrusion; the limiting protrusion is embedded in the sliding groove and can move along the extension direction of the sliding groove; Both ends of the groove extend circumferentially toward the end away from the connecting cylinder along the mounting cylinder; The non-destructive connection device for the air duct includes a limiting component, which includes a connecting flange and a telescopic component. The connecting flange is disposed on the end face of the mounting cylinder, and the telescopic component is located inside the mounting cylinder and connected to the connecting flange. When the connecting cylinder is in the first position, the telescopic member abuts against the limiting protrusion; when the force on the connecting cylinder exceeds a threshold, the limiting protrusion separates from the telescopic member. The groove includes a locking part and two sliding parts. The two sliding parts are disposed on opposite sides of the locking part and extend along the circumference of the mounting cylinder toward the end away from the connecting cylinder. The locking part is used to restrict the movement of the connecting cylinder in the first position, and the connecting cylinder can be separated from the locking part by force. The telescopic component includes a rod, a second elastic element, and a stop block. The rod is connected to the connecting flange, and the stop block is used to stop against the limiting protrusion and is slidably connected to the rod through the second elastic element.

2. The non-destructive connection device for a ventilation duct according to claim 1, characterized in that, The snap-fit ​​portion has a first arc-shaped surface recessed on the side away from the connecting cylinder.

3. The non-destructive connection device for a ventilation duct according to claim 1, characterized in that, The stop block has a second arc-shaped surface corresponding to the limiting protrusion, and the second arc-shaped surface is recessed towards the side close to the connecting cylinder; And / or, guide surfaces are provided on both sides of the stop block, and the guide surfaces are used to guide the sliding of the limiting protrusion; And / or, the inner wall of the mounting cylinder is provided with a mounting groove communicating with the sliding groove, and the rod is embedded in the mounting groove; And / or, the rod has a guide groove extending through one end away from the connecting flange, the second elastic element is installed in the guide groove, the stop block is embedded in the guide groove, and is movable along the extension direction of the guide groove.

4. The non-destructive connection device for a ventilation duct according to claim 1, characterized in that, The non-destructive connection device for the air duct also includes a damping component, which is disposed at both ends of the slide groove.

5. The non-destructive connection device for a ventilation duct according to claim 4, characterized in that, The damping assembly includes a damping block and a third elastic element. The damping block is disposed at the end of the slide groove, and the third elastic element is sleeved on the damping block, or the third elastic element is disposed inside the damping block.

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