Composite air duct structure convenient to assemble

Abstract

The utility model discloses a kind of composite air pipe structures facilitating assembly, including the air pipe base body of outer side covering fireproof insulation board, air pipe base body both ends are provided with connecting flange, adjacent connecting flange corner is uniformly connected with L type corner code by bolt fixation, the L type corner code is provided with two connecting pieces;L type connecting plate is provided between both ends connecting flange and adjacent fireproof insulation board, and two connecting pieces are respectively attached with L type connecting plate surface;Polygonal counterbore and bolt hole are respectively opened in the position of each fireproof insulation board and the L type connecting plate of this side, and each fireproof insulation board and the L type connecting plate of this side are fixedly connected by polygonal bolt and nut.

Description

Technical Field

[0001] This utility model relates to the field of industrial air duct technology, and in particular to a composite air duct structure that is easy to assemble. Background Technology

[0002] Existing ductwork installations typically involve fixing flanges to angle brackets. These angle brackets are designed with connecting plates, which are then screwed onto the fire-resistant insulation board covering the ductwork substrate and the connecting plates at the four corners. Finally, screws are applied to the connecting plates, connecting plates, and fire-resistant insulation board to achieve a secure overall connection. However, this connection method is prone to screw loosening over time, resulting in a loose and unstable structure.

[0003] In our study, we used rivet nuts to pre-set the duct base, and then used bolts to directly connect the connecting plate to the rivet nuts of the duct base.

[0004] In order to achieve a smooth and complete inner wall of the inner duct substrate and to facilitate operation, we designed a composite duct structure that is easy to assemble. Utility Model Content

[0005] In view of the problems existing in the prior art, this utility model provides a composite duct structure that is easy to assemble, aiming to solve the problems of installation stability, integrity and smoothness of the inner wall of the duct substrate and ease of installation of existing industrial ducts.

[0006] To achieve the above objectives, the technical solution of this utility model is as follows: a composite duct structure that is easy to assemble, comprising a duct base covered with a fire-resistant insulation board on the outside, connecting flanges at both ends of the duct base, and L-shaped corner brackets fixedly connected to the corners of adjacent connecting flanges by bolts, wherein the L-shaped corner brackets are provided with two connecting pieces; an L-shaped connecting plate is provided between the connecting flanges at both ends and on the adjacent fire-resistant insulation board, and the two connecting pieces are respectively attached to the surface of the L-shaped connecting plate;

[0007] Each fire-resistant insulation board and the L-shaped connecting plate on that side are respectively provided with polygonal countersunk holes and bolt holes. The fire-resistant insulation board on each side is fixedly connected to the L-shaped connecting plate on that side by polygonal bolts and nuts.

[0008] Preferably, the polygonal bolt is a square-headed nut, and the countersunk hole is square.

[0009] Preferably, the polygonal bolts and nuts are made of PEEK material.

[0010] Preferably, the fire-resistant insulation board has two layers, with a countersunk hole on the layer closest to the duct substrate and bolt holes on the other layer.

[0011] Preferably, the surfaces of adjacent fire-resistant insulation boards are in contact and fully fit with the L-shaped connecting plate.

[0012] The beneficial effects of this utility model are: changing the fixing method and fixing relationship, not affected by the thickness of the connecting piece, connecting plate or duct base, the installation is firm and tight, and it is not easy to loosen after long-term use; the installation is convenient and the inner wall of the duct base is smooth. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the existing installation structure.

[0014] Figure 2 This is a schematic diagram of the structure of this utility model. Detailed Implementation

[0015] like Figure 1 , 2 As shown, a composite duct structure that is easy to assemble includes a duct base 3 covered with a fire-resistant insulation board 2 on the outside. The duct base 3 has connecting flanges bent at both ends. L-shaped corner brackets 4 are fixedly connected to the corners of adjacent connecting flanges by bolts. The L-shaped corner brackets 4 are provided with two connecting pieces 41. L-shaped connecting plates 1 are provided between the connecting flanges at both ends and on adjacent fire-resistant insulation boards 2. The surfaces of adjacent fire-resistant insulation boards 2 are in contact with each other to form a complete fit with the L-shaped connecting plates 1. The two connecting pieces 41 are respectively attached to the surface of the L-shaped connecting plates 1.

[0016] Each fire-resistant insulation board 2 and the L-shaped connecting plate 1 on that side have polygonal countersunk holes 5 and bolt holes respectively. Each fire-resistant insulation board 2 and the L-shaped connecting plate 1 on that side are fixedly connected by polygonal bolts 6 and nuts. The polygonal bolts 6 are square-head nuts, and the countersunk holes are square, so that the square-head nuts will not rotate when installed.

[0017] Preferably, the polygonal bolt 6 and nut are made of PEEK material; they are not easily corroded or rusted and are resistant to high temperatures.

[0018] This utility model changes the fixing method of the connecting piece 4 of the L-shaped corner bracket 3 to the L-shaped connecting plate 5 and the fire-resistant insulation board 1. It is not affected by the thickness of the connecting piece 41, the L-shaped connecting plate 1 or the duct base 3. The installation is firm, the tightness is high, and it is not easy to loosen after long-term use.

[0019] Holes are pre-drilled in the fire-resistant insulation board 2 and the corresponding L-shaped connecting plate 1. During installation, polygonal bolts 6 are first embedded in each, and then the L-shaped connecting plate 1 on that side is fixed. Compared with using rivet nuts, this method is not only easier to install, but also ensures that the inner wall of the duct base 3 is smooth.

[0020] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions or improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A composite duct structure that is easy to assemble, comprising a duct base (3) covered with a fire-resistant insulation board (2) on the outside, wherein the duct base (3) is bent at both ends and provided with connecting flanges, and L-shaped corner brackets (4) are fixedly connected to the corners of adjacent connecting flanges by bolts, wherein the L-shaped corner brackets (4) are provided with two connecting pieces (41); an L-shaped connecting plate (1) is provided between the connecting flanges at both ends and on the adjacent fire-resistant insulation board (2), and the two connecting pieces (41) are respectively attached to the surface of the L-shaped connecting plate (1); characterized in that, Each fire-resistant insulation board (2) and the L-shaped connecting plate (1) on that side are respectively provided with polygonal countersunk holes (5) and bolt holes. The fire-resistant insulation board (2) on each side and the L-shaped connecting plate (1) on that side are fixedly connected by polygonal bolts (6) and nuts.

2. The composite duct structure for easy assembly according to claim 1, characterized in that, The polygonal bolt (6) uses a square head nut, and the countersunk hole is square.

3. The composite duct structure for easy assembly according to claim 1, characterized in that, The polygonal bolt (6) and nut are made of PEEK material.

4. The composite duct structure for easy assembly according to claim 1, characterized in that, The fire-resistant insulation board (2) has two layers. The layer closest to the duct substrate (3) has countersunk holes, and the other layer has bolt holes.

5. The composite duct structure for easy assembly according to claim 1, characterized in that, The surfaces of adjacent fire-resistant insulation boards (2) come into contact and are fully fitted with the L-shaped connecting plate (1).

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