Assembled smoke prevention and exhaust air duct

Abstract

This utility model discloses a prefabricated smoke exhaust duct, including a duct body, with a first flange and a second flange installed at the front and rear ends of the duct body, respectively. A first limiting mechanism and a second limiting mechanism are respectively installed on the first and second flanges. The output end of the first limiting mechanism is provided with a push rod, which is slidably connected to the first flange, and a limiting rod is fixedly installed at one end of the push rod. The second limiting mechanism has a limiting hole that can be interference-fitted with the limiting rod. The duct body assembly and disassembly operation of this utility model is simplified, saving manpower; it eliminates the need for traditional duct welding or bolt fastening, and assembly can be completed simply by driving the first limiting mechanism, allowing for single-person operation; the duct body, flanges, and limiting mechanisms are all modular components (L-shaped limiting blocks and guide seats can be disassembled and replaced individually). When a component is damaged, there is no need to disassemble the entire duct system; only the locking mechanism needs to be released to replace a single section of duct or the limiting component, reducing maintenance costs.

Description

Technical Field

[0001] This utility model relates to the field of air duct technology, specifically to a prefabricated smoke exhaust air duct. Background Technology

[0002] In building fire protection systems, smoke control ducts are crucial equipment for ensuring safe evacuation of personnel and controlling the spread of smoke during a fire. Traditional smoke control ducts are mostly fabricated and installed on-site, which has the following main technical drawbacks:

[0003] Traditional air ducts are connected and fixed by bolts inserted into threaded holes. When maintenance or replacement is needed, the bolts need to be unscrewed one by one. Due to the long service time and the fact that the bolts are prone to rusting due to moisture, they are not easy to unscrew, making disassembly more inconvenient. Utility Model Content

[0004] The main objective of this invention is to provide a prefabricated smoke exhaust duct to solve the aforementioned technical problems.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a prefabricated smoke exhaust duct, comprising a duct body, wherein a first flange and a second flange are respectively installed at the front and rear ends of the duct body, and a first limiting mechanism and a second limiting mechanism are respectively installed on the first flange and the second flange; a push rod is provided at the output end of the first limiting mechanism, the push rod is slidably connected to the first flange, and a limiting rod is fixed at one end of the push rod; a limiting hole is provided on the second limiting mechanism, which can be interference-fitted with the limiting rod.

[0006] Based on the above scheme and as a preferred embodiment of the above scheme: the first limiting mechanism includes several fixed plates fixed on the duct body on one side of the first flange. A hinge support is fixed on the top of the fixed plate. Two sets of first hinge arms are rotatably mounted on the hinge support. A drive arm is hinged to the two sets of first hinge arms. Two sets of second hinge arms are hinged to the outer wall of the drive arm. A rotating shaft is provided between the bottom ends of the two sets of second hinge arms. A top rod is movably mounted on the rotating shaft. A limiting rod is fixed at the end of the top rod. A guide seat is provided on the fixed plate. The top rod and the guide seat are slidably connected.

[0007] Based on the above scheme and as a preferred embodiment of the above scheme: the limiting rod is provided with a through fixing groove.

[0008] Based on the above scheme and as a preferred embodiment of the above scheme: the second limiting mechanism includes a plurality of L-shaped limiting blocks fixed on the second flange, and limiting holes are opened on the side of the L-shaped limiting blocks; a through insertion hole is opened on the top of the L-shaped limiting blocks.

[0009] Based on the above scheme and as a preferred embodiment of the above scheme: a plug rod is movably connected inside the socket, and the plug rod can be interference-fitted with the fixing groove.

[0010] The beneficial effects of this utility model are as follows: The disassembly and assembly of the duct body in this utility model is simplified, saving manpower; it does not rely on the welding or bolt tightening of traditional ducts (which requires tightening nuts one by one and calibrating bolt holes), and the splicing can be completed by simply driving the first limiting mechanism, which can be operated by a single person; the duct body, flange, and limiting mechanism are all modular components (L-shaped limiting blocks and guide seats can be disassembled and replaced separately), and when a certain component is damaged, it is not necessary to disassemble the entire duct system, but only to unlock it to replace a single section of duct or limiting component, thus reducing maintenance costs. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0012] Figure 2 This is the utility model Figure 1 Enlarged view of point A in the middle;

[0013] Figure 3 This is a top-view perspective view of this utility model. Detailed Implementation

[0014] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions in the embodiments will be clearly and completely described below with reference to the accompanying drawings. However, the specific implementation methods and embodiments described below are for illustrative purposes only and are not intended to limit the present invention.

[0015] See attached diagram. Figures 1 to 3 In this embodiment, a prefabricated smoke exhaust duct includes a duct body 1. A first flange 2 and a second flange 3 are respectively installed at the front and rear ends of the duct body 1. A first limiting mechanism and a second limiting mechanism are respectively installed on the first flange 2 and the second flange 3. The output end of the first limiting mechanism is provided with a push rod 44, which is slidably connected to the first flange 2. A limiting rod 46 is fixedly provided at one end of the push rod 44. The second limiting mechanism is provided with a limiting hole 50 that can be interference-fitted with the limiting rod 46.

[0016] Furthermore, the first limiting mechanism includes several fixed plates 333 fixed on one side of the duct body 1 of the first flange 2. A hinge support 4 is fixed on the top of the fixed plate 333. Two sets of first hinge arms 40 are rotatably mounted on the hinge support 4. A drive arm 41 is hinged to the two sets of first hinge arms 40. Two sets of second hinge arms 42 are hinged to the outer side wall of the drive arm 41. A rotating shaft 43 is provided between the bottom ends of the two sets of second hinge arms 42. A top rod 44 is movably mounted on the rotating shaft 43. A limiting rod 46 is fixed at the end of the top rod 44. A guide seat 45 is detachably mounted on the fixed plate 333. The top rod 44 and the guide seat 45 are slidably connected.

[0017] Furthermore, a through-hole fixing groove 460 is provided on the limiting rod 46.

[0018] Furthermore, the second limiting mechanism includes several L-shaped limiting blocks 5 fixed to the second flange 3, with limiting holes 50 formed on the side of the L-shaped limiting blocks 5; a through insertion hole is formed on the top of the L-shaped limiting blocks 5. The L-shaped limiting blocks 5 can also be detachably connected to the second flange 3.

[0019] Furthermore, a plug rod 6 is movably connected inside the socket, and the plug rod 6 can be interference-fitted with the fixing groove 460.

[0020] In one possible implementation, a first limiting mechanism and a second limiting mechanism are respectively installed in the circumferential direction of the first flange 2 and the second flange 3.

[0021] This prefabricated smoke exhaust duct achieves rapid splicing and stable connection between ducts through flange reference positioning and multi-level limit locking structure. The specific workflow is as follows:

[0022] 1. Alignment of duct splicing reference: The core load-bearing component of a single duct section is the duct body 1, with the first flange 2 and the second flange 3 fixedly installed at its front and rear ends respectively. The two flanges serve as the reference surfaces for splicing adjacent ducts. When it is necessary to connect two duct body sections 1, align the second flange 3 of the previous duct body section with the first flange 2 of the subsequent duct section to ensure that the end faces of the two flanges are fully fitted.

[0023] 2. Movement of the first limiting mechanism: The driving arm 41 is driven manually or by a tool by external force. The two ends of the driving arm 41 are respectively hinged to two sets of first hinge arms 40 and two sets of second hinge arms 42. When the driving arm 41 is under force, it will drive the two sets of first hinge arms 40 to rotate around the hinge support 4. The hinge support 4 is fixed to the top of the fixed plate 333, and the fixed plate 333 is rigidly connected to the duct body 1 on one side of the first flange 2. The rotation of the first hinge arm 40 is synchronously transmitted to the second hinge arm 42 through the driving arm 41, so that the two sets of second hinge arms 42 drive the bottom rotating shaft 43 to move in the horizontal direction. The rotating shaft 43 is movably connected to the top rod 44, and the top rod 44 is constrained by the guide seat 45 on the fixed plate 333 and can only slide along the axial direction of the guide seat 45. Finally, the rotating shaft 43 pushes the top rod 44 to extend in the direction of the second flange 3 to avoid the top rod 44 from deviating.

[0024] 3. Initial locking of limit rod and limit hole with interference fit: A limit rod 46 is fixedly provided at one end of the top rod 44 near the second flange 3. When the top rod 44 extends, the limit rod 46 will be inserted into the limit hole 50 of the second limit mechanism. The second limit mechanism consists of several L-shaped limit blocks 5 fixed on the second flange 3. The limit hole 50 is opened on the side of the L-shaped limit block 5 facing the first flange 2, and the diameter of the limit hole 50 and the outer diameter of the limit rod 46 are designed to be interference fit - after insertion, it can directly limit the radial displacement of the two flanges, forming the initial locking of the duct splicing and preventing lateral loosening.

[0025] 4. Secondary reinforcement through the cooperation of the fixing groove and the insertion rod: The limiting rod 46 has a through fixing groove 460, and the top of the L-shaped limiting block 5 has an insertion hole aligned with the fixing groove 460. Insert the insertion rod 6 into the insertion hole. After the insertion rod 6 passes through the insertion hole, it forms an interference fit with the fixing groove 460. At this time, the insertion rod 6 can limit the axial displacement of the limiting rod 46 and prevent the limiting rod 46 from coming out of the limiting hole 50, thereby achieving dual locking in both radial and axial directions and further improving the connection stability.

[0026] 5. If it is necessary to disassemble or replace the air duct, simply reverse the operation: first pull out the insertion rod 6, then reverse the drive arm 41 of the first limiting mechanism, so that the second hinge arm 42 drives the rotating shaft 43 to pull the top rod 44 back, and the limiting rod 46 disengages from the limiting hole 50, thus separating the two sections of air duct. The operation is convenient and does not damage the air duct body 1.

[0027] The duct body assembly and disassembly operation in this embodiment is simplified, saving manpower; it does not rely on the welding or bolt tightening of traditional ducts, which requires tightening nuts one by one and calibrating bolt holes. The assembly can be completed by simply driving the first limiting mechanism, which can be operated by a single person; the duct body, flange, and limiting mechanism are all modular components, such as L-shaped limiting blocks and guide seats, which can be disassembled and replaced individually. When a component is damaged, there is no need to disassemble the entire duct system. Only the locking needs to be released to replace a single section of duct or the limiting component, thus reducing maintenance costs.

[0028] The above embodiments are merely preferred embodiments of the present utility model and are not intended to limit the scope of protection of the present utility model. Therefore, all equivalent changes made to the structure, shape, and principle of the present utility model should be covered within the scope of protection of the present utility model.

Claims

1. A prefabricated smoke exhaust duct, characterized in that: The duct body (1) includes a first flange (2) and a second flange (3) installed at its front and rear ends respectively. A first limiting mechanism and a second limiting mechanism are installed on the first flange (2) and the second flange (3) respectively. The output end of the first limiting mechanism is provided with a push rod (44), which is slidably connected to the first flange (2). One end of the push rod (44) is fixedly provided with a limiting rod (46). The second limiting mechanism is provided with a limiting hole (50) that can be interference-fitted with the limiting rod (46). The first limiting mechanism includes several fixed plates (333) fixed on the duct body (1) on one side of the first flange (2). A hinge support (4) is fixedly provided on the top of the fixed plate (333). Two sets of first hinge arms (40) are rotatably installed on the hinge support (4). A drive arm is hinged to the two sets of first hinge arms (40). 41) Two sets of second hinge arms (42) are hinged to the outer side wall of the drive arm (41). A rotating shaft (43) is provided between the bottom ends of the two sets of second hinge arms (42). A top rod (44) is movably installed on the rotating shaft (43). A limiting rod (46) is fixed at the end of the top rod (44). A guide seat (45) is provided on the fixed plate (333). The top rod (44) and the guide seat (45) are slidably connected. A through fixing groove (460) is opened on the limiting rod (46). The second limiting mechanism includes several L-shaped limiting blocks (5) fixed on the second flange (3). A limiting hole (50) is opened on the side of the L-shaped limiting block (5). A through insertion hole is opened on the top of the L-shaped limiting block (5). An insertion rod (6) is movably connected in the insertion hole. The insertion rod (6) can be interference-fitted with the fixing groove (460).

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