Smoke prevention and exhaust pipeline connecting structure
Through the memory alloy connector and annular spring structure, the problem of vibration misalignment at the smoke exhaust pipe connection is solved, stable connection and high-temperature seal are achieved, and the risk of flue gas leakage is reduced.
Patent Information
- Application Number
- CN202521245914.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-06-18
- Publication Date
- 2025-07-29
- Estimated Expiration
- 2035-06-18
AI Technical Summary
The existing smoke-proof and exhaust pipe connections are easily misaligned when vibrating, resulting in an increase in gaps, a high risk of smoke leakage, and it is difficult for ordinary fastening devices to effectively reset and seal.
Connectors made of memory alloy material and annular spring structure are used to buffer deformation during vibration using the shape memory effect of memory alloy, and sealing is restored during fire; the annular spring provides elastic reset and the sealing ring enhances sealing.
Stable connection under normal conditions to reduce vibration gaps; self-sealing during fires significantly reduce the risk of smoke leakage and improve safety.
Smart Images
Figure CN223165233U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of building fire protection, and particularly relates to a connection structure for smoke exhaust and inlet pipes. Background Art
[0002] Smoke exhaust and inlet pipes are an important part of the building fire protection system. They are mainly used to control the spread of smoke and discharge high-temperature and toxic gases during a fire, so as to gain time for personnel evacuation and fire fighting and rescue. Smoke exhaust and inlet pipes are usually made of fire-resistant materials, with high-temperature resistance and corrosion resistance. They are mainly installed in key areas such as stairwells, corridors, and basements of buildings through suspension rods and hangers. During a fire, the smoke and high-temperature gases in the fire area are pumped out of the building through a fan to prevent the smoke from filling the escape route and keep the evacuation route clear. At the same time, a positive pressure air supply system forms positive pressure air supply in key areas such as stairwells and refuge floors to block the intrusion of smoke into safe spaces, discharge high-temperature gases, delay the spread of fire, and reduce the risk of damage to the building structure.
[0003] In the prior art, smoke exhaust and inlet pipes are generally butt-jointed by multiple sections of air ducts. After the air ducts are hoisted by hangers, their joints are generally connected by bolts or other fastening devices. When the air ducts vibrate due to external force factors such as hangers, the joints of the air ducts may be misaligned to generate gaps, and ordinary fastening devices are difficult to reset the air ducts. The gaps will increase with the increase in the number of vibrations, and it is easy to cause smoke leakage during a fire, which is very dangerous. Content of the Utility Model
[0004] The main purpose of the utility model is to provide a connection structure for smoke exhaust and inlet pipes, which can effectively solve the above problems.
[0005] The utility model provides the following technical solution: a connection structure for smoke exhaust and inlet pipes, including two butt-jointed air ducts and a connecting piece. Docking flanges are fixedly arranged at both ends of the air ducts. The docking flanges extend from the edges of the air ducts to the outer sides all around. The connecting piece is located between the docking flanges of two adjacent air ducts. The two ends of the connecting piece are respectively inserted into the ends of two adjacent air ducts. The middle part of the connecting piece extends outwards. The docking flanges and the middle part of the connecting piece are fixedly connected by multiple groups of fasteners. Ring-shaped springs are respectively sleeved at both ends of the fasteners. The connecting piece is made of shape memory alloy.
[0006] Further, the fastener includes a screw and a nut. There are two ring-shaped springs, and the two ring-shaped springs are respectively located on both sides of the joint of adjacent air ducts. The ring-shaped springs are fixedly connected to the air ducts through screws and nuts.
[0007] Further, the ring-shaped spring includes an inner ring and two outer rings, and the two outer rings are symmetrically inserted at both ends of the inner ring.
[0008] Furthermore, tapered grooves are formed on both end surfaces of the inner ring, and the surface of one end of the outer ring close to the inner ring is a conical surface, and the conical surface of the outer ring is inserted into the corresponding grooves of the inner ring.
[0009] Furthermore, through holes are formed through the bottom of the grooves, and fastening holes are formed through the middle of the outer ring, and screws are inserted into the fastening holes and the through holes.
[0010] Furthermore, a flared groove is formed at the end of the air duct connected to the docking flange, a vertical plate is arranged in the middle of the connecting piece, connecting frames are fixedly arranged at both ends of the vertical plate, and the connecting frames are inserted into the corresponding flared grooves.
[0011] Furthermore, a plurality of docking holes are formed through the surface of the vertical plate at intervals in the circumferential direction, a plurality of connecting holes are formed through the surface of the docking flange at intervals in the circumferential direction, the plurality of connecting holes correspond to the plurality of docking holes one by one, and screws are inserted into the connecting holes and the docking holes.
[0012] Furthermore, a sealing ring is arranged between the connecting frame and the flared groove, the cross-sectional shape of the sealing ring is Z-shaped, and the outside of the sealing ring is clamped between the vertical plate and the docking flange.
[0013] Furthermore, the screw passes through the annular spring, the docking flange, the sealing ring, the vertical plate, another sealing ring, the docking flange of the adjacent air duct and another annular spring in sequence and then is connected with a nut, so as to tightly connect the annular spring, the sealing ring, the connecting piece and the adjacent two air ducts.
[0014] Compared with the prior art, the utility model has the following beneficial effects:
[0015] 1. In the utility model, the connecting piece is made of shape memory alloy. By utilizing the shape memory effect of the shape memory alloy, the connecting piece can undergo plastic deformation under vibration when there is no fire to play a buffering role, ensuring the stability of the air duct connection. When a fire occurs and the temperature rises, the connecting piece returns to its original shape, ensuring the sealing performance at the connection of the air ducts, greatly reducing the hidden danger of smoke leakage, and having stronger safety.
[0016] 2. In the utility model, the annular springs are arranged on both sides of the connection of the air ducts. When the air ducts vibrate, due to the elastic performance of the annular springs, the reset ability of the air ducts is further improved, greatly reducing the dislocation between adjacent two air ducts. At the same time, under the action of the connecting piece and in cooperation with the sealing ring, the sealing performance of the air ducts can be further enhanced. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] The following further describes the utility model with reference to the drawings.
[0018] Figure 1 is a schematic structural diagram of the utility model;
[0019] Figure 2 Schematic diagram of the disassembly structure of the present utility model;
[0020] Figure 3 Schematic diagram of the connecting member structure of the present utility model;
[0021] Figure 4 Schematic diagram of the disassembly structure of the fastener of the present utility model;
[0022] Figure 5 Schematic diagram of the sectional structure at the connection of the air duct of the present utility model.
[0023] In the figure: 1. Air duct; 11. Docking flange; 12. Connection hole; 13. Flared groove; 2. Connecting member; 21. Connection frame; 22. Vertical plate; 23. Docking hole; 3. Fastener; 31. Screw; 32. Nut; 33. Annular spring; 331. Inner ring; 3311. Groove; 3312. Through hole; 332. Outer ring; 3321. Fastening hole; 4. Sealing ring; 41. Round hole. Specific embodiments
[0024] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without making creative efforts belong to the scope of protection of the present utility model.
[0025] Specific embodiments are as Figures 1-5 shown: A connection structure for a smoke exhaust and prevention pipeline includes two docked air ducts 1 and a connecting member 2. Docking flanges 11 are fixedly provided at both ends of the air duct 1. The docking flanges 11 extend outward from the edge of the air duct 1 to the periphery. The connecting member 2 is located between the docking flanges 11 of two adjacent air ducts 1. Both ends of the connecting member 2 are respectively inserted into the ends of two adjacent air ducts 1. The middle part of the connecting member 2 extends outward. The docking flanges 11 and the middle part of the connecting member 2 are fixedly connected by multiple groups of fasteners 3. Annular springs 33 are respectively sleeved at both ends of the fastener 3. The material of the connecting member 2 is a shape memory alloy.
[0026] Furthermore, the fastener 3 includes a screw 31 and a nut 32. Two annular springs 33 are provided. The two annular springs 33 are respectively located on both sides of the connection of two adjacent air ducts 1. The annular springs 33 are fixedly connected to the air duct 1 through the screw 31 and the nut 32.
[0027] Furthermore, the annular spring 33 includes an inner ring 331 and two outer rings 332. The two outer rings 332 are symmetrically inserted at both ends of the inner ring 331.
[0028] Further, tapered grooves 3311 are provided on both end surfaces of the inner ring 331. One end surface of the outer ring 332 close to the inner ring 331 is a conical surface. The taper of the groove 3311 in the inner ring 331 is the same as that of the conical surface of the outer ring 332. The conical surface of the outer ring 332 is inserted and fitted with the corresponding groove 3311 of the inner ring 331.
[0029] Further, through holes 3312 are provided through the bottom of the groove 3311, and a fastening hole 3321 is provided through the middle of the outer ring 332. The screw 31 is inserted into the fastening hole 3321 and the through hole 3312.
[0030] Further, a flared groove 13 is provided at the end of the air duct 1 connected to the docking flange 11. A vertical plate 22 is provided in the middle of the connecting member 2. The vertical plate 22 is located between the docking flanges 11 of two adjacent air ducts 1. Connecting frames 21 are fixedly provided at both ends of the vertical plate 22. The connecting frames 21 are inserted and fitted with the corresponding flared grooves 13.
[0031] Further, a plurality of docking holes 23 are provided through the vertical plate 22 at intervals in the circumferential direction, and a plurality of connecting holes 12 are provided through the docking flange 11 at intervals in the circumferential direction. The plurality of connecting holes 12 correspond to the plurality of docking holes 23 one by one. The screw 31 is inserted into the connecting hole 12 and the docking hole 23.
[0032] Further, a sealing ring 4 is provided between the connecting frame 21 and the flared groove 13. The cross-sectional shape of the sealing ring 4 is Z-shaped. The sealing ring 4 is sleeved outside the connecting frame 21. The inner surface of the sealing ring 4 abuts against the outer surface of the connecting frame 21. The outer surface of the sealing ring 4 abuts against the inner surface of the flared groove 13. The outside of the sealing ring 4 is clamped between the vertical plate 22 and the corresponding docking flange 11. A plurality of round holes 41 are provided through the outer surface of the sealing ring 4 at intervals in the circumferential direction. The plurality of round holes 41 correspond to the plurality of docking holes 23 on the corresponding vertical plate 22 one by one. The screw 31 is inserted into the round holes 41. The provided annular springs 33 are located on both sides of the connection of the air duct 1. When the air duct 1 vibrates, due to the elastic performance of the annular springs 33, the reset ability of the air duct 1 is further improved, and the situation of misalignment between two adjacent air ducts 1 is greatly reduced. At the same time, under the action of the connecting member 2, the sealing performance of the air duct 1 can be further enhanced in cooperation with the sealing ring 4.
[0033] Further, the screw 31 passes through the annular spring 33, the docking flange 11, the sealing ring 4, the vertical plate 22, another sealing ring 4, the docking flange 11 of the adjacent air duct 1, and another annular spring 33 in sequence and is connected to the nut 32, so as to tightly connect the annular spring 33, the sealing ring 4, the connecting member 2 and two adjacent air ducts 1.
[0034] Further, the phase change temperature range of the connecting member 2 can be customized according to actual scenario requirements, for example, 150°C - 300°C. When the temperature in the air duct 1 is lower than the martensite phase change temperature of the connecting member 2, the connecting member 2 is in the martensite phase. At this time, the connecting member 2 is prone to plastic deformation and plays a shock-absorbing and buffering role when the air duct 1 vibrates. When the temperature in the air duct 1 is higher than the austenite phase change temperature of the connecting member 2, the inner surface of the connecting frame 21 returns to the pre-set original shape and is flush with the inner surface of the air duct 1. At this time, the connecting member 2 is in the austenite phase, and the connecting member 2 has strong rigidity and seals the connection of the air duct 1.
[0035] When a smoke-proof and exhaust air duct connection structure is in use, after hoisting an air duct 1 in place, the sealing ring 4 is sleeved on the outside of one side connecting frame 21 of the connecting member 2, and the connecting frame 21 sleeved with the sealing ring 4 is inserted into the flared groove 13 at one end of the hoisted air duct 1. Similarly, the sealing ring 4 is sleeved on the outside of the other side connecting frame 21 of the connecting member 2, and another air duct 1 is hoisted so that the flared groove 13 of the un-installed air duct 1 is inserted into the connecting frame 21 of the other side of the connecting member 2 sleeved with the sealing ring 4. At this time, the connection between two adjacent air ducts 1 and the connecting member 2 is completed. The screw 31 sequentially passes through the annular spring 33, the butt flange 11, the sealing ring 4, the vertical plate 22, another sealing ring 4, the butt flange 11 of the adjacent air duct 1, and another annular spring 33, and then is tightened with the nut 32. Similarly, the screws 31, nuts 32 and annular springs 33 are installed in other connection holes 12 to complete the installation of two adjacent air ducts 1;
[0036] When there is no fire, due to the shape memory effect of the shape memory alloy, when the temperature in the air duct 1 is lower than the martensite phase change temperature of the connecting member 2, if the air ducts 1 vibrate, the connecting member 2 undergoes plastic deformation due to the vibration and plays a buffering role. As the adjacent air duct 1 joints vibrate, the inner ring 331 of the annular spring 33 produces a squeezing effect, causing the outer ring 332 to expand outward. The elastic outer ring 332 will increase the pre-tightening force of the screw 31 when expanding outward, thereby increasing the friction force between the butt flange 11 and the vertical plate 22, effectively suppressing the generation of a large gap between the two air ducts 1, and at the same time, energy dissipation ability can also be generated during this process. After the vibration disappears, the annular spring 33 returns to its original size under the action of the elastic internal force, ensuring the stability of the connection between the air ducts 1. When a fire occurs, high-temperature smoke enters the air duct 1. At this time, the temperature in the air duct 1 gradually becomes higher than the austenite phase change temperature of the connecting member 2. The connecting member 2 is in the austenite phase and has strong rigidity, and will spontaneously return to the pre-set original shape, that is, the inner surface of the connecting frame 21 of the connecting member 2 is flush with the inner surface of the air duct 1, and cooperates with the sealing ring 4 to seal the connection of the adjacent air ducts 1 to prevent smoke leakage, with higher safety.
Claims
1. A connection structure for smoke exhaust and prevention ducts, characterized in that: It includes two butt - jointed air ducts and a connector. Docking flanges are fixedly arranged at both ends of the air ducts. The docking flanges extend outward from the edge of the air ducts to the periphery. The connector is located between the docking flanges of two adjacent air ducts. The two ends of the connector are respectively inserted into the ends of two adjacent air ducts. The middle part of the connector extends outward. The docking flanges and the middle part of the connector are fixedly connected by multiple groups of fasteners. Ring springs are respectively sleeved at both ends of the fasteners. The material of the connector is shape memory alloy.
2. The smoke prevention and exhaust duct connection structure according to claim 1, characterized in that: The fasteners include screws and nuts. There are two ring springs. The two ring springs are respectively located on both sides of the connection of adjacent air ducts. The ring springs are fixedly connected to the air ducts through screws and nuts.
3. The smoke exhaust and prevention duct connection structure according to claim 2, characterized in that: The ring spring includes an inner ring and two outer rings. The two outer rings are symmetrically inserted at both ends of the inner ring.
4. The connection structure of a smoke prevention and exhaust duct according to claim 3, characterized in that: Conical grooves are opened on the surfaces at both ends of the inner ring. The surface of the outer ring close to the inner ring is a conical surface. The conical surface of the outer ring is in interference fit with the corresponding grooves of the inner ring.
5. The connection structure of a smoke prevention and exhaust duct according to claim 4, characterized in that: Through holes are opened through the bottom of the grooves. Fastening holes are opened through the middle of the outer rings. The screws are inserted into the fastening holes and the through holes.
6. A smoke prevention and exhaust duct connection structure according to claim 1, characterized in that: A flared groove is arranged at the end of the air duct connected to the docking flange. A vertical plate is arranged in the middle of the connector. Connection frames are fixedly arranged at both ends of the vertical plate. The connection frames are inserted into the corresponding flared grooves.
7. A smoke prevention and exhaust duct connection structure according to claim 6, characterized in that: A plurality of docking holes are penetrated through the surface of the vertical plate at circumferential intervals. A plurality of connection holes are penetrated through the surface of the docking flange at circumferential intervals. The plurality of connection holes correspond to the plurality of docking holes one by one. The screws are inserted into the connection holes and the docking holes.
8. A smoke prevention and exhaust duct connection structure according to claim 7, characterized in that: A sealing ring is arranged between the connection frame and the flared groove. The cross - sectional shape of the sealing ring is Z - shaped. The outside of the sealing ring is clamped between the vertical plate and the docking flange.
9. The smoke prevention and exhaust duct connection structure according to claim 8, characterized in that: The screws pass through the ring spring, docking flange, sealing ring, vertical plate, another sealing ring, the docking flange of the adjacent air duct and another ring spring in sequence and then are connected to the nuts, thereby tightly connecting the ring spring, sealing ring, connector and two adjacent air ducts.