Air pipe connecting structure and air pipe

Abstract

The utility model relates to an air duct connection structure and air duct, including sealing flange, sealing clamping strip, screw and right-angle air duct plate layer, the sealing flange is installed on the external corner side of right-angle air duct plate layer, the sealing clamping strip is installed on the internal corner side of right-angle air duct plate layer, the sealing flange is provided with a counter bore, the sealing clamping strip is provided with a blind hole, and the screw is connected with the screw. The screw nails penetrate through the counter bores, the blind holes and the right-angle air pipe plate layers, the air pipe connecting structure encircles the right-angle air pipe plate layers to form the air pipe, the phenomena of cold bridges, surface condensation, air leakage and the like at the right-angle connecting positions of the air pipe can be effectively avoided, and the fire endurance of the fireproof air pipe is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of air ducts, in particular to an air duct connection structure and an air duct. Background Art

[0002] The statements in this section merely provide background technical information related to the present invention and do not necessarily constitute prior art.

[0003] Traditional smoke exhaust system ducts are covered with fireproof insulation and protective panels, that is, the outer wall of the galvanized steel plate duct is covered with a certain thickness of rock wool or glass wool and other fire-resistant insulation and fire protection materials. Because rock wool and glass wool have poor appearance and are prone to falling off and poor sealing, they are generally covered with a layer of fireproof protective panel on the outside; steel-faced magnesium composite ducts came into being based on traditional fireproof coated ducts, that is, the structure of the duct from the inside to the outside is galvanized or color-coated steel plate layer, magnesium composite foam insulation layer, magnesium composite fireproof board protective layer, and F-type, pound-shaped flange angle, and snap-on profiles are often used around the duct to fix the duct plate layer firmly with bolts or rivets. However, the following technical problems often occur during use:

[0004] (1) The F-type and pound-shaped flange connectors used in the smoke exhaust system duct are generally metal parts formed by sheet metal die-casting or die-casting. Referring to a magnesium composite duct with the announcement number CN218761894U, the metal pound-shaped connecting flange is assembled and connected with the composite plate, and a sealant is applied between the side wall of the duct and the wall of the connecting flange to seal the gap between the connecting flange and the magnesium composite plate. After the duct is used for a long time, the sealant is prone to debonding and air leakage at the right-angle joint, and the inner surface insulation layer may fall off or collapse. During the operation of the duct, the internal temperature will change, especially in an environment with a large temperature difference. The insulation material may loosen or fall off due to thermal expansion and contraction; if the humidity inside the duct is too high, the insulation material may absorb moisture and soften, weaken the bonding force, and eventually fall off; the duct system may vibrate during operation, and long-term vibration will cause the bonding between the insulation layer and the inner wall of the duct to fail, thereby causing it to fall off; causing condensation on the duct surface, air leakage, and cold bridge phenomena.

[0005] (2) When a fire occurs, due to the high thermal conductivity of metal-formed connectors, metal easily transfers heat, causing the fireproof board layer inside the component to heat up quickly, resulting in a reduction in the time the fireproof board can play a fire-isolating role, which can easily reduce the heat resistance and thermal insulation performance of the fireproof board layer and reduce the fire resistance limit of the fireproof air duct. Utility Model Content

[0006] In order to overcome the above-mentioned deficiencies in the prior art, the utility model provides an air duct connection structure.

[0007] To achieve the above objectives, one or more embodiments of the present invention provide the following technical solutions:

[0008] A duct connection structure includes a sealing flange, a sealing strip, a screw and a right-angle duct plate layer. The sealing flange is installed on the positive angle side of the right-angle duct plate layer, and the sealing strip is installed on the negative angle side of the right-angle duct plate layer. The sealing flange is provided with a countersunk hole, and the sealing strip is provided with a blind hole. The screw passes through the countersunk hole, the blind hole and the right-angle duct plate layer.

[0009] It is further configured that the right-angle air duct plate layer includes a fire-resistant plate layer, an insulation layer and a metal plate layer, the metal plate layer is arranged close to the sealing card strip, the fire-resistant plate layer is arranged close to the sealing flange, and the insulation layer is arranged between the fire-resistant plate layer and the metal plate layer.

[0010] It is further configured that the sealing flange includes a slot, an inner sunken boss, a countersunk hole, fireproof and heat-insulating rubber and a metal body, the overall cross-section of the sealing flange is an angular metal body, an inner sunken boss is provided at the center of the metal body, a countersunk hole is provided on the inner sunken boss, slots are provided at both ends of the metal body, and fireproof and heat-insulating rubber is provided in the slots.

[0011] It is further configured that the sealing strip includes an inner guard, an outer guard, a slot, a blind hole and a U-shaped elastic strip. The sealing strip is an L-shaped structure composed of an inner guard and an outer guard. A slot is provided between the inner guard and the outer guard. A blind hole is provided in the center of the inner guard. A U-shaped elastic strip is provided on one side of the slot and inside the inner guard and the outer guard.

[0012] It is further configured that connecting screws are set through the sealing flange, the sealing strip and the right-angle air duct plate layer.

[0013] It is further configured that rivets are set through the sealing flange and the right-angle air duct plate layer.

[0014] It is further configured that an angle plate is provided on the outer side of the sealing flange.

[0015] It is further configured that a fireproof sealing material is filled between the corner plate and the sealing flange.

[0016] It is further configured that a bushing is provided on the outside of the screw nail.

[0017] In addition, the utility model also provides an air duct, including the above-mentioned air duct connection structure.

[0018] One or more of the above technical solutions have the following beneficial effects:

[0019] (1) The sealing flange on the side of the external angle and the Y-shaped sealing strip on the side of the internal angle are plugged into one body. The sealing flange is provided with an inner concave platform or a screw hole. The screw is connected to the blind hole in the Y-shaped sealing strip through the screw hole and locked to the sealing flange to form a whole. The connection point of the single-sided steel-magnesium composite air duct plate layer is covered, and the single-sided steel-magnesium composite insulation air duct plate layer connection on both sides of the air duct is fixed by rivets and connecting screws. The sealing flange and the Y-shaped sealing strip are both embedded elastic metal element bases, and are insulated, compressible, and elastic finished composite parts applied or molded on the outer wall of the base. They can effectively avoid the occurrence of cold bridges, surface condensation, air leakage, etc. at the right-angle connection of the air duct, improve the operation efficiency of the ventilation and smoke exhaust system, and increase the fire resistance limit time of the air duct, providing valuable time for the effective evacuation of people in the building, and achieving the purpose of reliable and stable operation of the smoke exhaust system.

[0020] (2) The sealing flange and sealing strip of the utility model are made of non-metallic materials, and the sealing strip and sealing strip are made of insulating, compressible, elastic polyurethane foam material, which has good thermal insulation performance. After a fire occurs, due to the low thermal conductivity of the sealing flange and sealing strip, it will not affect the fireproof board layer inside the component, thereby improving the fire resistance limit of the fireproof air duct. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention.

[0022] Figure 1 It is a structural diagram of the present utility model.

[0023] Figure 2 This is a schematic structural diagram of the sealing flange of the present invention.

[0024] Figure 3 This is a structural diagram of the sealing clip of the present invention.

[0025] Reference numerals:

[0026] 1 right-angle duct board layer; 11 fire-resistant board layer; 12 thermal insulation layer; 13 metal board layer;

[0027] 2 sealing flange; 21 slot; 22 internally sunken boss; 23 countersunk hole; 24 fireproof and heat-insulating rubber; 25 metal body;

[0028] 3 connecting screws; 4 rivets; 5 angle plates; 6 fireproof sealing; 7 screw nails; 8 bushings;

[0029] 9 Sealing card strip; 91 blind hole; 92 inner edge protection; 93 slot; 94 outer edge protection; 95 U-shaped elastic card strip. DETAILED DESCRIPTION

[0030] It should be noted that the following detailed descriptions are exemplary and are intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0031] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present invention.

[0032] In the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0033] Example 1

[0034] This embodiment discloses a duct connection structure. Figure 1 , including a sealing flange 2, a sealing strip 9, a screw 7 and a right-angle air duct plate layer 1. The sealing flange 2 is installed on the positive angle side of the right-angle air duct plate layer 1, and the sealing strip 9 is installed on the negative angle side of the right-angle air duct plate layer 1. The sealing flange 2 is provided with a countersunk hole 23, the sealing strip 9 is provided with a blind hole 91, and the screw 7 passes through the countersunk hole 23, the blind hole 91 and the right-angle air duct plate layer 1.

[0035] The right-angle air duct plate layer 1 includes a fire-resistant plate layer 11, an insulation layer 12 and a metal plate layer 13. The metal plate layer 13 is arranged close to the sealing strip 9, and the fire-resistant plate layer 11 is arranged close to the sealing flange 2. The insulation layer 12 is arranged between the fire-resistant plate layer 11 and the metal plate layer 13. The inner angle surfaces of the two right-angled sides of the sealing flange 2 are pressed tightly against the fire-resistant plate 11 on the outer side of the single-sided steel-magnesium air duct plate layer 1.

[0036] The sealing flange 2 includes a slot 21, an inner sunken boss 22, a countersunk hole 23, a fireproof and heat-insulating rubber 24 and a metal body 25. The size of the countersunk hole 23 is matched with the screw nail 7. The overall cross-section of the sealing flange 2 is an angular metal body 25. The inner sunken boss 22 is provided at the center of the embedded metal body 25. The inner sunken boss 22 is provided with a countersunk hole 23. Slots 21 are provided at both ends of the embedded metal body 25. Fireproof and heat-insulating rubber 24 is provided in the slot 21. The sealing flange 2 is a compressible, elastic finished composite part of the heat-insulating rubber 24 applied or molded on the outer wall of the metal body 25, and adopts a new self-flame-retardant and highly fire-resistant polyurethane insulation material.

[0037] See also Figure 3The sealing strip 9 includes an inner guard 92, an outer guard 94, a slot 93, a blind hole 91 and a U-shaped elastic strip 95. The sealing strip 9 is an L-shaped structure composed of an inner guard 92 and an outer guard 94. A slot 93 is set between the inner guard 92 and the outer guard 94. The width of the slot 93 is determined according to the thickness of the outer galvanized sheet or color steel sheet of the single-sided steel-magnesium composite air duct sheet. The groove width is 1.0~3.0mm. The slot 93 provides installation space for the metal plate layer 13.

[0038] A blind hole 91 is opened in the center of the inner guard 92, and a U-shaped elastic clip 95 is set on one side of the slot 93 and inside the inner guard 92 and the outer guard 94. The inner guard 92 has a certain slope in the direction of the groove width, and the slope is inclined toward the outer guard 94, with a slope value of 1 / 10-1 / 5. The formed slope facilitates the insertion of the metal plate layer 13 into the slot 93 formed by the inner guard 92 and the outer guard 94.

[0039] The metal plate layer of the right-angle air duct layer is made of outer galvanized steel plate or color steel plate layer, and the metal plate 13 layer is inserted into the plug-in groove 93 of the sealing card strip 9.

[0040] The slots 93 , the inner edge guards 92 and the outer edge guards 94 are connected by screws 3 to press and firmly connect the fire-resistant board layer 11 and the galvanized or colored metal board layer 13 of the right-angle air duct board layer 1 .

[0041] See also Figure 2 , connecting screws 3 are set through the sealing flange 2, the sealing strip 9 and the right-angle duct plate layer 1, and rivets 4 are set through the sealing flange 2 and the right-angle duct plate layer 1. The single-sided steel-magnesium composite insulation duct plate layer 1 on both sides of the right angle of the duct is fixed by the connecting screws 3 and rivets 4. The width direction dimension of the inner guard 92 of the sealing strip 9 is 10 to 15 mm smaller than the dimension of the outer guard 93. The part of the outer guard 94 that is larger than the inner guard 92 plays a bearing role for the metal plate layer 13.

[0042] An angle plate 5 is provided on the outer side of the sealing flange 2 , and the size and thickness of the angle plate 5 are matched with the size of the clamping groove 21 of the sealing flange 2 .

[0043] The space between the angle plate 5 and the sealing flange 2 is filled with fireproof sealing material 6, which prevents the screw nails 5 from loosening and being damaged, and plays a role in preventing cold bridges.

[0044] The angle plate 5 is an angled structural profile with a cross section of 90°, which is formed by bending, die-pressing or molding a metal plate layer.

[0045] A bushing 8 is provided outside the screw nail 7, and an outer wall of the screw nail 7 is provided with a heat-insulating, flame-retardant fireproof bushing 8, the specific material of which is a self-flame-retardant high-fireproof polyurethane insulation new material to improve the fire resistance and heat insulation performance of the screw nail 7.

[0046] Example 2

[0047] This embodiment discloses an air duct, in which mutually perpendicular right-angled air duct plate layers are installed in pairs through four groups of air duct connection structures described in the first embodiment. One group of air duct connection structures fixes two right-angled air duct plate layers. After the four right-angled air duct plate layers are installed, an air duct is formed.

[0048] The specific installation steps are as follows:

[0049] By plugging the sealing flange 2 on the side of the positive angle and the sealing strip 9 on the side of the negative angle into one body, a corner guard plate 5 is provided on the outside of the sealing flange 2, and fireproof and heat-insulating sealing materials are provided at the corner guard plate 5 and the inner sunken boss 22 of the sealing flange 2 and the nail cap of the screw nail 7. A new self-flame retardant and highly fire-resistant polyurethane thermal insulation material is used to cover the connection point of the single-sided steel-magnesium composite air duct right-angle plate layer 1, and fix it at the connection of the insulation air duct plate layer on both sides of the right angle of the air duct. This can effectively avoid the occurrence of cold bridges, surface condensation, air leakage and the like at the right-angle connection of the air duct. The density and fire resistance of the right-angle connection of the air duct are improved through structural settings, and the thermal insulation performance and fire resistance limit are improved through the selection of materials, thereby ensuring the efficient operation of the ventilation and smoke exhaust systems.

[0050] Although the above description of the specific implementation methods of the present invention is combined with the accompanying drawings, it does not limit the scope of protection of the present invention. Technical personnel in the relevant field should understand that on the basis of the technical solution of the present invention, various modifications or deformations that can be made by technical personnel in this field without creative work are still within the scope of protection of the present invention.

Claims

1. A duct connection structure, comprising a sealing flange, a sealing strip, a screw and a right-angle duct plate layer, characterized in that: A sealing flange is installed on the positive angle side of the right-angle air duct plate layer, a sealing strip is installed on the negative angle side of the right-angle air duct plate layer, the sealing flange is provided with a countersunk hole, the sealing strip is provided with a blind hole, and the screw nail passes through the countersunk hole, the blind hole and the right-angle air duct plate layer.

2. The air duct connection structure according to claim 1, characterized in that: The right-angle air duct plate layer includes a fire-resistant plate layer, a heat-insulating layer and a metal plate layer. The metal plate layer is arranged close to the sealing card strip, the fire-resistant plate layer is arranged close to the sealing flange, and the heat-insulating layer is arranged between the fire-resistant plate layer and the metal plate layer.

3. The air duct connection structure according to claim 1, characterized in that: The sealing flange includes a slot, an inner recessed boss, a countersunk hole, fireproof and heat-insulating rubber and a metal body. The overall cross-section of the sealing flange is an angular metal body. The inner recessed boss is arranged at the center of the metal body, and the countersunk hole is provided on the inner recessed boss. Slots are arranged at both ends of the metal body, and fireproof and heat-insulating rubber is arranged in the slots.

4. The air duct connection structure according to claim 1, characterized in that: The sealing clip includes an inner guard, an outer guard, a slot, a blind hole and a U-shaped elastic clip. The sealing clip is an L-shaped structure composed of an inner guard and an outer guard. A slot is arranged between the inner guard and the outer guard. A blind hole is arranged in the center of the inner guard. A U-shaped elastic clip is arranged on one side of the slot and inside the inner guard and the outer guard.

5. The air duct connection structure according to claim 1, characterized in that: Connecting screws are arranged through the sealing flange, the sealing clip and the right-angle air duct plate layer.

6. The air duct connection structure according to claim 1, characterized in that: Rivets are set through the sealing flange and the right-angle duct plate layer.

7. The air duct connection structure according to claim 1, characterized in that: An angle plate is arranged on the outer side of the sealing flange.

8. The air duct connection structure according to claim 7, characterized in that: Fireproof sealing material is filled between the corner plate and the sealing flange.

9. The air duct connection structure according to claim 1, characterized in that: A bushing is arranged outside the screw nail.

10. An air duct, characterized in that: It comprises the air duct connection structure as described in any one of claims 1 to 9.

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