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The main points of clean air conditioning system construction

2016-09-05 16:16:49
Article Source: Shenzhen Yong-clean Engineering Co., Ltd. Author: Admin Views: 1009
With the application of clean rooms, the use of clean air conditioners has become more and more widespread, and the level of cleanliness has also improved. Many clean air conditioners have succeeded through careful design and careful construction, but some clean air conditioner systems have been downgraded for use because they fail to meet the cleanliness requirements after design and construction, and even scrapped into general air conditioners. The clean air-conditioning system has high technical requirements, high construction quality requirements, and large investment. Once it fails, it will cause waste in terms of financial resources, material resources and manpower. Therefore, to clean the air-conditioning system, in addition to perfect design drawings, high quality High level of construction.

1.The material for making the air duct is the basic condition to ensure the cleanliness of the air conditioner

Material selection. The ducts of clean air-conditioning systems are generally processed with galvanized steel. Galvanized steel should be made of high-quality steel. The standard of galvanized layer should be> 314g / m2, and the coating should be uniform, without crusting and oxidation. Hangers, reinforcement frames, connecting bolts, washers, duct flanges, and rivets should be galvanized. Flange gaskets should be flexible, dust-free, soft rubber or latex sponge with a certain strength, and ducts. For external insulation, a flame-resistant PE board with a bulk density of more than 32K can be used. It can be pasted with special glue, and fiber products such as glass wool must not be used.

Physical inspection should also pay attention to material specifications, material smoothness, sheet material should also check flatness, corner angle squareness, galvanized layer adhesion and so on. During the transportation of materials after purchase, care should be taken to keep the packaging intact, moisture-proof, impact-proof, and pollution-proof.

Material storage. A dedicated warehouse for clean air-conditioning materials should be set up or centralized storage. The storage place should be clean, free of pollution sources, and avoid moisture, especially the damper, vent, muffler and other components should be tightly packed and stored. Clean air-conditioning materials should shorten the storage time of the warehouse. The board used for making the duct should be shipped to the site to avoid pollution caused by the handling of the parts.

2. Only when the air duct is made well can the system cleanliness be guaranteed.

2.1 Preparation before making duct.

The air duct of the clean system shall be processed in a relatively sealed room. The indoor walls should be smooth, not producing dust, and not accumulating dust. Thick plastic flooring can be laid on the ground, and the joint between the floor and the wall should be sealed with tape to avoid dust generation. Before the air duct is processed, the room must be clean, free of dust and pollution. It can be repeatedly cleaned with a vacuum cleaner after cleaning and scrubbing. Tools for making ducts must be cleaned with alcohol or non-corrosive detergent before entering the production room. It is impossible and unnecessary for the production equipment to enter the production room, but it must be kept clean and free of dust. Workers participating in the production should be relatively fixed. Persons entering the production site must wear disposable dust-free caps, gloves, masks, and work clothes should be changed frequently. Production materials should be scrubbed two or three times with alcohol or non-corrosive detergent before entering the production site for use.

2.2 Main points for making ducts of clean system.

After processing, the semi-finished product should be scrubbed again before entering the next process. The processing of air duct flanges must ensure that the plane of the flanges is flat and the specifications are accurate and match the air ducts to ensure that the joints are tight when the air ducts are combined. There should be no horizontal seams at the bottom of the air duct, and vertical seams should be avoided as much as possible. Large-sized air ducts should be made of the entire board as much as possible, and the ribs should be reduced as much as possible. Those that must be provided with ribs should not be used to strengthen the ribs and the ribs in the duct.

The joints or corner bites should be used as far as possible in the production of air ducts. Snap-type bites should not be used for clean air ducts of Class 6 or higher. Damage to the galvanized layer at the bite, damaged rivet holes and welded flanges must be repaired. Silicone seals shall be applied to the cracks in the flanges of the air duct seams and around the rivet holes. The flange of the air pipe must be flat and even. Flanging width and rivet holes, flange screw holes must be strictly in accordance with the requirements of the specification. The flexible short pipe must have a smooth inner wall. Generally, artificial leather or plastic can be used, and the rubber for the inspection of the air duct door should be soft rubber.

3. The handling and installation of clean air ducts is the key to ensuring cleanliness.

3.1 Preparation before installation. Before the installation of the clean air conditioning system, a schedule must be formulated in accordance with the main construction procedures of the clean room. The plan must be coordinated with other professions and implemented in strict accordance with the plan. The installation of clean air-conditioning systems must first be completed after the construction professional (including ground, wall, floor) paint, sound absorption, elevated floors and so on. Before installation, complete the work of positioning the air duct and installing the lifting points, and repair the paint on the walls and floors damaged during the installation of the lifting points.

3.2 After the room is cleaned, transport the system air duct in. Pay attention to the protection of the head during the transportation of the air duct, and clean the surface of the air duct before entering the site.

3.3 After participating in the installation, the workers must wear clean clothes, masks and shoe covers before construction. The tools, materials, and components used must be scrubbed with alcohol, checked with dust-free paper, and entered the construction site after meeting the requirements.

3.4 The connection of air pipe fittings and components shall be connected while opening the head. The air pipe shall be free of oil pollution. The flange gasket shall be a material that is not easily aged and has elastic strength, and shall not be spliced straight. After installation, the open end must remain sealed.

3.5 Air pipe insulation shall be performed after the system piping installation and air leak detection are qualified. After the insulation is completed, the room must be thoroughly cleaned.

4. Serious and orderly commissioning to ensure the successful commissioning of the clean air-conditioning system.

4.1 After the installation of the clean air-conditioning system is completed, the air-conditioning room and the air-conditioning room must be cleaned and cleaned. All irrelevant items must be removed, and the paint on the walls, ceiling, and floor of the air-conditioning room and the computer room must be carefully inspected for damage and supplemented. The filtering system of the equipment can be directly installed at the end of the air supply system (high-efficiency filters can be installed in systems with cleanliness of ISO 6 or higher), carefully check the electrical, automatic control system, power supply system, and verify that each system is in good condition before commissioning.

4.2 Develop a detailed commissioning plan, arrange personnel to participate in the commissioning, and prepare necessary tools, equipment, and measuring tools.

4.3 The test run must be conducted under unified organization and unified command. During the trial operation, the fresh air filter is replaced every 2 hours, and the end equipped with the high-efficiency filter should be replaced and cleaned regularly, usually once every 4 hours. The trial operation must be carried out continuously. The operating conditions can be understood from the data of each air-conditioning room and equipment room from the automatic control system, and adjusted by the automatic control system. The clean air commissioning time must meet the time specified in the GB50243-2002 specification.

4.4 After trial operation, the system can be tested for various indicators after it reaches stability. Test contents include air volume (wind speed), static pressure difference, air filter leakage, indoor air cleanliness level, indoor plankton and sediment bacteria, air temperature and humidity, indoor air flow manifold, indoor noise and other indicators. It can also be designed according to design cleanliness Grades or grades in the agreed acceptance status are required.

In short, to ensure the success of clean air conditioning system construction, the following principles should be grasped:

1. Strictly check the purchase of materials and check the dust-free process of the process.

2. Establish various systems to ensure clean air-conditioning construction.

3. Strengthen the technical and quality education of construction personnel.

4. Have a full range of tools and appliances.

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