The clean room's dust-free and aseptic condition is indispensable to most modern manufacturing industry. Without clean production conditions, products are polluted, either by malfunction or harmful to human body. Nowadays, people use various components made in clean rooms to apply to computers, automobiles, airplanes, space vehicles, televisions, CD players and other electronic devices and mechanical devices; clean rooms are also used to produce drugs, medical devices and fast food. Clean room is more and more widely used. The same level of clean room, due to the application of different fields, requirements are also very different. Clean air-conditioning system has high technical requirements, construction quality requirements and large investment. If it fails, it will cause waste in terms of financial, material and human resources. Therefore, in order to do a good job of clean air-conditioning system, besides perfect design drawings, it also requires high-quality and high-level construction.
Clean room technology can be divided into three parts: design, construction and operation. The construction requirements of clean rooms are higher than those of other buildings, and different kinds of products produced in clean rooms require different levels of air cleanliness, so there are certain differences in the construction contents of various clean rooms. But its basic construction contents such as clean room building decoration, purification air conditioning system, electrical lighting system, fire safety alarm system are basically the same, the difference is due to the different needs of the production process, the corresponding measures, supply system and so on. Next Ed purification and you talk about the construction of clean air conditioning system should pay attention to several issues.
1. Clean air conditioning must comply with the relevant norms and requirements
"Clean workshop design code", "clean room construction and acceptance code", "ventilation and air conditioning construction acceptance code", "hospital clean operation Department building technical code" and so on are the main specifications for cleanliness. The specifications strictly stipulate the requirements of clean room materials, structure and decoration, and the decorative surface of clean room. Quality requirements, etc. We must fully understand the design intention, strictly implement the spirit of national documents on project quality management, and strictly organize construction to ensure quality.
2. Strict Material Control
At present, most domestic clean rooms adopt metal panel assembly structure, and its greatest advantages are as follows:
(1) Tight seams, reduce indoor dust environment, suitable for high cleanliness rooms;
(2) Wall and room shapes can be designed according to user's needs, regardless of octagonal or rounded shapes are not limited by the size of the plate.
Common are stainless steel structure, carbon steel plate structure and electrolytic plate structure, aluminum plate and aluminum-plastic plate structure. In recent years, with the rapid development of material industry, the application of color steel plate is also increasing.
The air duct of clean air conditioning system is usually processed with galvanized steel sheet. The galvanized steel sheet should be of high quality. The standard of galvanized layer is more than 314g/m2. The galvanized steel sheet should have uniform coating, no shelling and no oxidation. Galvanized parts shall be used for hangers, reinforcement frames, connecting bolts, air duct flanges and rivets. Flexible, dust-free, strong soft rubber or latex sponge shall be used for flange cushions. Flame duct insulation shall be made of flame retardant PE sheets with a capacity of more than 32K, which shall be pasted with special adhesive and fiberglass products shall not be used.
Clean room floor is also an important part to ensure indoor cleanliness. Its material requirements are anti-skid, anti-static, wear-resistant, corrosion-resistant and easy to clean. Common clean room floor are: cast-in-situ copper bar terrazzo floor, plastic floor, and rubber floor (generally before the use of self-leveling materials flat floor).
In the process of material purchasing, the manufacturer's products with quality assurance in the same product must be selected according to plan and variety. In physical inspection, attention should also be paid to material specifications, material smoothness, plate smoothness, edge and corner squareness, adhesion of galvanized layer, etc. In the course of transportation and storage after purchasing, attention should also be paid to keeping intact packaging, moisture-proof, impact-proof and pollution-proof.

3. Reasonable arrangement of construction sequence is the basis of ensuring cleanliness.

The principles of reasonable construction procedure are as follows:
"Eight successively".
"Six simultaneity".
Namely: first clean up and install; first hoist the upper part and then install the middle part; first cut off and then hang the ceiling; first big equipment enter the field and then cut off and close; first clean up and install, then process installation; first decorate, first up and down, first inside and then out; clean room finish and then carry out ground treatment; first adjust and then test. "Six simultaneity" is: simultaneous organization of equipment and engineering; simultaneous production of accessories and material organization; simultaneous installation of air conditioning pipeline and process pipeline; simultaneous operation of clean system engineering and delivery air conditioning equipment; simultaneous trial operation of various specialties in clean system engineering, simultaneous adjustment and testing; and civil engineering closure project. Simultaneously with the clean installation part. In concrete construction, the finished and semi-finished products of the previous process must be guaranteed not to be damaged, and the construction cross-work between different specialties must be sincerely cooperated and highly unified command.
After the basic installation of various main pipes, the construction of the assembled clean system should thoroughly clean the indoor floor, column, wall and space once, so as to achieve clean and dust-free. Its process is divided into roof installation and wall panel installation.
Roof Installation: On-site preparation-measurement setting-out-roof opening-support suspension keel installation, adjustment-roof installation, protective opening installation-tuyere, lamp floor installation-lamp installation-tearing film, cleaning, gluing-air blowing, cleaning-high efficiency filter installation.
Wallboard Installation: On-site preparation-measurement setting-out-wallboard keel installation-professional embedded parts-doors and windows, air shower chamber installation-tearing film, cleaning, gluing-air blowing cleaning-return blinds, residual pressure valve installation.
4. The manufacture, handling and installation of clean air ducts are guaranteed.
Key to cleanliness
Many constructors will pay attention to the special requirements of the installation of clean system in construction, namely: clean installation site; clean installation of system (plastic film seal); clean clothing of site and installation personnel; selection of dust-free materials; tight seams to prevent air leakage, etc. But there are still several points to be noted:
Joints: Transverse joints are not allowed in pipelines, and longitudinal joints should be as few as possible. When the bottom is less than or equal to 800mm, no longitudinal joints are allowed at the bottom.
Bite: Joint angle or corner bite should be used as far as possible. No button bite should be used for clean air ducts above grade 6.
Sealing: All bite seams, flange flanges and rivets must be coated with sealant to prevent air leakage; all kinds of sealing gaskets are strictly prohibited from painting the surface;
Reinforcement bars: not in pipe;
Flange: Screw holes should be set at the four corners, the hole spacing is less than 100 mm, and the bolts, nuts, gaskets and rivets should be galvanized.
Measuring holes: Cleaning and all kinds of measuring holes should be set up when the diameter of the pipe is more than 500 mm; Storage: cleaning with neutral cleaning solution after making, sealing with plastic film after drying for installation;
Removal and sealing: Only the sealing film of the pipe port is allowed to be removed during installation, and the port should be sealed again when the installation stops.
Cleaning: When air duct parts are installed, oil and dust on the surface should be removed, and the inner surface of the system should be wiped many times with materials that are not easy to remove fibers.
Leakage inspection: After installation of the system, air leakage inspection should be carried out before insulation. (Class 1-5 system is implemented according to the regulations of air duct of high-pressure system, Class 6-9 system is implemented according to air duct of medium-pressure system). Light leakage detection can be carried out with low-pressure illumination lamp greater than 100W. Light leakage points of low-pressure system are not more than 2 in every 10-meter joint, and 16 in every 100-meter joint are qualified on average; light leakage points of medium-pressure system are not more than 1 in every 10-meter joint. The average number of qualified places per 100 meters is not more than 8.
5 Requirements for installation of high efficiency filters
Installation of high efficiency filters is also the key to clean room construction. The cleaning room must be cleaned again after 12 hours of system commissioning before the packing of high efficiency filter can be dismantled. After appearance inspection, leak detection (focusing on the sealing quality of filter frame) can be carried out on site, and then resistance allocation can be made.
6. Pressure difference control of clean room is an important condition to ensure cleanliness
In the Code for the Design of Clean Workshops in China, the pressure difference control of the clean room is stipulated as follows: the pressure difference between the clean room and the surrounding space must be maintained, and the positive or negative pressure difference must be maintained according to the requirements of the production process. The pressure difference between clean rooms of different grades and between clean areas and non-clean areas should be no less than 5 Pa, and between clean areas and outdoor areas should be no less than 10 Pa. When considering the pressure difference control of clean room, the determination of pressure difference air volume of clean room at home and abroad is mostly estimated by the number of room ventilation, which requires designers and builders to pay enough attention to the concept of the number of ventilation. The ventilation times of clean air conditioning system are at least more than 10 times per hour, even up to hundreds of times. In practical engineering, the resistance of air supply and return system is too large due to the protruding structure of columns and beams of buildings, which makes the number of air exchange fail to meet the design requirements. If the non-unidirectional flow double-wall return top air distribution form is adopted, this situation is more obvious.
After acceptance of the project, the maintenance work should also be done well.
After the construction of the clean room is completed, it is also very important for the operation and management of the clean room. Regular inspection of indoor and equipment, mainly monitoring of equipment, and indoor projects in addition to conventional indoor ceiling air supply ceiling (or efficient air supply) and wall air return port visual cleanliness must be monitored, more important should also be Including the number of dust particles, bacterial colonies, air supply, indoor positive (negative) pressure and so on. Daily management must ensure the correct operation of the clean room, so that the products manufactured are not polluted. This requires the correct implementation of the entrance of personnel and materials, the selection of clothing, the provisions of the clean room and the cleaning of the clean room. Maintenance personnel should also be trained when necessary.
The professional technicians of Ed Purification Engineering design a reasonable plan to adapt to the production process and the cost of the project. The design technical indicators meet the national standard of clean room. The experienced construction team of the purification project is fast and efficient, and the after-sales service is perfect. To learn more about the medical purification industry, please pay attention to the Wechat Public No. Aide-188 (Ed Purification and Oxygen Supply)