1, process flow 2, construction method The installation of air ducts shall be carried out according to the specifications. System installation shall be carried out in strict accordance with the construction procedures and shall not be reversed. (1) After the duct is manufactured according to the measured size, it should be numbered according to this construction project and system to prevent mistakes in transportation and installation. The duct, pipe fittings and other components should be pre-assembled according to the design drawings or the measured sketches to check whether their specifications and quantities are consistent. If any omission or quality difference is found, the manufacturer shall be required to rework and make up for it. (2) Before the installation of air ducts and components, it should be further verified whether the elevations of air ducts and air supply (exhaust) outlets and other components are consistent with the design drawings. If not, immediately submit it to the construction unit and design institute for modification. Transport the racks (hangers), air ducts and components processed in the production workshop to the construction site for pre-assembly. (3) Construction of steam-water pipes ① The embedded parts or expansion bolts of steam-water pipes and components shall be located correctly, firmly and reliably, and the embedded parts shall be free of oil stains and shall not be painted to ensure firm combination. (2) The hanger boom should be straight, with complete threads and bright and clean. The suspenders are connected by lap welding, and the lap length is not less than 6 times the diameter of the suspenders, and both sides are welded. (3) The screw holes on the supports and hangers are machined, and electric welding is not allowed. (4), hanger shall not be set in tuyere, valve, inspection door, nor shall it be directly fixed on the flange. (4) The detachable interface and adjustment mechanism between the air duct and the fittings are not installed on the wall or floor. (5) The gasket of air duct connecting flange is made of soft rubber sheet with a thickness of 3mm ... The cushion should not extend into the air duct, so as not to increase the resistance, reduce the effective cross-sectional area of the air duct, form vortex and increase dust accumulation in the air duct. Minimize the seams of flange gaskets. (6) The allowable deviation of levelness of air duct after horizontal installation is not more than 3 mm per meter; The total deviation is not more than 20 mm, and the allowable deviation of verticality of vertical duct after installation is not more than 2mm per meter; The total deviation is not more than 20 mm. (7) The air duct shall be fixed with expansion bolts. When the big side of the air duct is greater than 400mm, the distance between the hanger and the bracket should not exceed 4 m (8) The exposed surface of the air outlet should be parallel to the indoor circuit, and the surface of the air outlet should not be fixed with bolts. (2) Construction method for installation of air duct valves 1. Process flow: support and hanger installation → valve hoisting → valve fixing → electrical wiring coordination. 2. Construction practice (1) Before installation, check whether the structure of all kinds of valves is firm and whether the regulating device is flexible, and the regulating valve should be installed in a position convenient for operation; Before installing the fire damper, test whether the valve plate is closed tightly. The fire damper is installed along the airflow direction, and the fusible parts are at the windward end. (2) The fire damper shall be provided with a hanger separately. (The installation method is as shown below) 3) An inspection port is set at the valve position in the ceiling to facilitate maintenance. (3) tuyere installation construction method 1. Process flow: decorate and leave holes → install tuyeres → level and align → fix tuyeres 2. Construction method (1) Various tuyere diffusers will be carried out with the renovation project. The tuyere end face, ceiling and fresh air tuyere will be installed on the wall flush with the wall. The hole in the wall shall not be larger than the size outside the tuyere. The fixing screw of tuyere should not be at the bottom of tuyere, but should be fixed at the inner side of tuyere. (2) The exposed surface of the tuyere shall be parallel to the indoor circuit. It is forbidden to fix the tuyere surface with bolts, and the tuyere fixing bolts should be hidden. (4) muffler installation construction method 1. Process flow: coordinate determination → support and hanger fixing → muffler hoisting → installation in place. 2. Construction practice (1) The outer surface of the muffler should be smooth, and there should be no obvious bumps, scratches and corrosion; (2) The glass fiber cloth wound on the sound-absorbing board should be smooth and undamaged, and the air guide strips set at both ends should be intact; (3) The screws for fastening the muffler components should be evenly distributed, and the joints should be smooth, and they should not be loose or fall off; (4) The surface of perforated plate should be clean, free from corrosion and hole plugging. (5) The muffler shall be installed in the right direction and shall not be damaged or affected with damp. (6) The site installation of large-scale combined muffler shall be carried out in the correct construction sequence. The layout, direction and position of muffler components should meet the design requirements, and individual muffler components should be firmly fixed. (7) Mufflers and muffling pipes should be supported separately, and their weight should not be borne by air pipes. (5) ventilator 1 construction method, process flow: 2. Construction method (1) The handling and hoisting of the ventilator shall comply with the following provisions: ① For the integrally installed fan, the ropes for handling and hoisting shall not be tied to the rings of the rotor and the housing bearing cover; (2) For the fan assembled on site, the binding of the rope will not damage the surface of the parts, and the rotor, journal and shaft seal will not be used as binding parts; (2) The air inlet, air outlet pipe and other devices of the ventilator have separate supports and are firmly connected with the foundation or other buildings; When the air duct is connected with the fan, it is not forced to face each other, and the casing does not bear the weight of other components. (3) The exposed part of the ventilator transmission device is provided with a protective cover; When the air inlet or air inlet pipe of the ventilator is directly connected with the atmosphere, a protective net should be installed or other safety measures should be taken. (4) If the ventilator base is directly installed on the basis of no isolation device, the pad iron should be used to increase the height. (5) The foundation and dimensions of each part of the ventilator meet the design requirements. Before grouting the reserved holes, sundries should be removed. Fine stone concrete shall be used for grouting, the strength grade of which is higher than that of foundation concrete, and it shall be compacted, and the anchor bolts shall not be skewed. (6) The motor shall be horizontally installed on the slideway or fixed on the foundation, and the alignment shall be subject to the ventilator. The motor located outside the house shall have a rain cover. (7) The disassembly, cleaning and assembly of the fan shall comply with the following provisions: ① Before cleaning, the casing and bearing box shall be disassembled, and the direct-drive fan shall not be disassembled and cleaned; (2) Clean and check the adjusting mechanism, and rotate flexibly; ③ The assembly accuracy of each component meets the requirements of product technical documents. (8) When the axial flow fan is assembled, the clearance between the impeller and the main air duct is evenly distributed and conforms to the provisions in the table below. The above is the explanation of "ventilation engineering process and main construction methods". For more information, please visit Zhong Da for consultation.

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