According to the working conditions of fabric expansion joints, its basic structure consists of four parts (shown as the attached pic): The inside baffle (it can be omitted some time), its role as a thermal insulation material bearing body and to avoid direct airflow scouring insulation material resulting in premature failure of fabric expansion joints; (2) Rack (it can be omitted for some structural forms and certain working conditions), on the one hand, which is associated with the smoke duct as part of fabric expansion joint, on the other hand, it is used as fixed bracket of fabric expansion joint. (3) Insulation material (medium temperature ≤ 150 ℃ can be omitted), it is mainly isolated heat of the rumors to improve the rack and outer cover of the working conditions, at the same time, possessed noise reduction effect. (4) Sealing pressure layer (cover), its role is to seal and pressure resistance. Main structural forms of fabric expansion joint is relatively wide, which can be summarized and divided into A, B, C, D four forms from its characteristics.
1—inside baffle；2—Rack；3—Insulation material；4一Sealing pressure layer
A type structure. High versatility, easy installation and replacement, good sealing performance, and large absorption displacement (axial and lateral). Two types, A2-type structure is mainly used to install the vertical pipe to prevent water corrosion at the flange.
B-type structure. Axial size is small, displacement amount absorbed per unit effective length is small. Installed in a vertical pipe at the flange is not easy to be waterlogging, and suitable for making negative pressure resistant type. At room temperature conditions, the rack can be omitted so that can reduce costs and installation time. But the device starts frequently and the displacement of the large amount of cases, which be easy to fatigue damage. It is mainly used for the entrance and exit of draught fan. As a vibration damping device, such as for starting frequent and large displacement conditions, in order to avoid premature failure of the expansion joint, special measures should be taken.
C type structure. With a great absorption of lateral displacement and axial displacement of the capacity. At room temperature conditions, the rack can be omitted so that can reduce costs and installation time. However, it consumes more materials (expensive), large size, should not be made resistant to negative pressure type. Its sealing performance can match B type.
D-type structure. Which is a special structure, its basic characteristics and A-type structure the same, but compared with human-type structurethe, installation of fabric of replacement time-consuming is too long. It is mainly used for internal replacement of non-metallic body of the occasion, which are not restricted with the surrounding space conditions reduce the workload of scaffolding system and so on.
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