Clean technology and electronic product production technology promote each other and develop together. The new national standard meets the requirements for clean technology in the production of electronic products in the new era. The implementation of the new national standard has brought my country's clean technology to a new level. Clean production environment (clean workshop, clean room) successively used concepts such as "clean room", "windowless workshop", "closed workshop", "room with controlled airborne particles". The design, construction and use of clean workshops should be such that no or less particles are introduced, no or less particles, no retention or less retention of particles. In addition, the clean workshop also controls temperature, humidity, pressure and other parameters according to product production requirements. According to product production requirements, it is necessary to control the airflow distribution, airflow speed, noise, vibration, and static electricity in the clean room. Product production promotes the evolution of clean technology The development of clean technology at home and abroad is constantly evolving with the development of science and technology and the upgrading of product production, especially the development of military industry, electronics, aerospace and biomedicine industries. Modern industrial products and modern scientific experiment activities require miniaturization, precision, high purity, high quality and high reliability. Taking miniaturization as an example, electronic computers have evolved from huge units placed in several rooms to portable notebooks today. At the same time, the electronic components used in it also range from electron tubes to discrete semiconductor devices, to integrated circuits and very large-scale integrated circuits; the line width of integrated circuits has also developed from a few microns to 45 nanometers today. These new technology products require a strict clean production environment. Clean technology is continuously developed in accordance with the increasingly stringent requirements of product production for the control of pollutants in the clean production environment, control methods, and control facilities. Clean technology is a comprehensive technology. Its core technology includes production process technology and process design, air purification, clean construction, and professional technology required for the production of various products (such as high-purity substances required for the production of microelectronic products --- High-purity water, high-purity gas, high-purity chemicals related professional technology, etc.). These professional technologies are indispensable in clean room design. They must cooperate closely, coordinate with each other and make overall arrangements around the needs of product production. The design and construction of clean workshops is to do a good job of various safety facilities-fire protection, fire protection,...
At present, the new control method is an adaptive control method. The airflow rate is kept at the minimum safety limit. The working condition of the fume hood is adjusted according to the user's state. The system responds sensitively, controls accurately, ensures the safety of personnel, and minimizes energy consumption. And maintenance costs. The primary problem to be solved by the ventilation design of the laboratory is the safety problem. The dust collection ability of the fume hood must meet certain standards and regulations. The airflow direction is to flow to the laboratory. The laboratory must maintain negative pressure at all times, in order to ensure the operator and the environment. The safety of modern laboratories needs to be considered as a key factor. 1. Stable wind speed on the fume hood In the constant air volume ventilation system, when the regulating door is lowered, excess surface wind speed will be generated, which will cause eddy current interference, affect the dust collection capacity of the fume hood, and release toxic particles. In a variable air volume ventilation control system, the exhaust air volume and the opening of the regulating door are linear functions. For example, 60% of the flow corresponds to 60% of the opening of the regulating door. Through this closed-loop control system, the surface wind speed of the fume hood opening can be maintained. Constant, eliminating the risk of excessive surface wind speed. The effective face wind speed setting value of the fume hood, the general industry standard is 60-100fpm (0.3-0.6m/s), generally 100pfm (0.5m/s) is accepted as a safe operation standard. As shown in Figure 1, the movement of the operator has almost no effect on dust collection when the face wind speed is 80-100 fpm, but there will be disturbance effects when the face wind speed is below 80 fpm. When there is no operator moving, general dust collection below 60 fpm can be achieved. 2. Fast system response time The response time mainly refers to the fume hood and its valve regulation system within the laboratory. The response time will directly determine the effect of airflow control. Fast and stable control will prevent toxic particles from escaping from the fume hood following possible oscillation or overshoot during the adjustment process. The quick response time of the exhaust air volume to the opening degree of the regulating door must reach its command value within 1 second after the regulating door is in place to effectively ensure the dust collection capacity of the fume hood. In Figure 2, the total response time from the movement of the regulating door to the exhaust air volume of the fume hood is about 0.6 seconds. Slow response time will produce excess surface wind speed, endangering the safety of the experiment, for example, the burner is blown out, the utensils are blown over, or the medicine is lost. 3. Ensure room pressure The net negative pressure in the room mainly controls the flow of airflow ...
The operating room is an important technical department of the hospital, which provides corresponding operations and rescue sites according to the patient's condition. With the rapid development of surgical technology, the operating room is becoming more modern, and the safe operating room of universities can meet the needs of organ transplantation, heart, blood vessel, artificial joint replacement and other large-scale operations under the aseptic environment of the operating room. In order to be able to rescue patients in time, the layout of the operating room should be connected to the surgical department, but also close to the blood bank, nursing room, anesthesia and resuscitation room, etc. And pay attention to the management of the four ways in the operating room, such as: the designated air cleanliness classification of the operating room; the items needed in the operating room; the professional operating skills of doctors and nurses; prevent infection and ensure the success rate of surgery. The air pressure of the operating room varies according to the cleanliness requirements of different areas (such as the operating room, sterile preparation room, hand brushing room, anesthesia room, and surrounding clean area, etc.). Different levels of laminar flow operating rooms have different air cleanliness standards. For example, the United States Federal Standard 1000 is the number of dust particles ≥0.5μm per cubic foot of air, ≤1000 particles or ≤35 particles per liter of air. The standard of 10,000-level laminar flow operating room is the number of dust particles ≥0.5μm per cubic foot of air, ≤10,000 particles or ≤350 particles per liter of air. And so on. The main purpose of ventilation in the operating room is to eliminate exhaust gas in each work room; to ensure the necessary amount of fresh air in each work room; to remove dust and microorganisms; to maintain the necessary positive pressure in the room. There are the following two mechanical ventilation methods that can meet the ventilation requirements of the operating room. Combined use of mechanical air supply and mechanical exhaust: This type of ventilation can control the number of air changes, air exchange volume and indoor pressure, and the ventilation effect is better. Mechanical air supply and natural exhaust air are used together. The air exchange and the number of air exchanges in this ventilation method are limited to a certain extent, and the ventilation effect is not as good as the former. The cleanliness level of the operating room is mainly distinguished by the number of dust particles and the number of biological particles in the air. Currently, the most commonly used is the NASA classification standard. Purification technology achieves the purpose of sterility by controlling the cleanliness of the positive pressure purification air flow. According to different air supply methods, purification technology can be divided into two types: turbulent flow system and laminar flo...
The air filter in the purification workshop is mainly responsible for removing particulate impurities in the air. When piston type machinery (internal combustion engine, reciprocating compressor, etc.) is working, if the inhaled air contains dust and other impurities, it will aggravate the wear of the parts, so an air filter must be installed. The air filter consists of two parts: a filter element and a shell. The main requirements of the air filter are high filtration efficiency, low flow resistance, and continuous use for a long time without maintenance. Its use is too wide, such as pharmaceuticals, scientific research, machinery, spraying, electronics, plastics, etc. Air filtration is used in all aspects. The air filter in the purification workshop needs to be replaced after it has been used for a long time. How to identify whether the air filter should be replaced? How to judge whether an air filter should be replaced? First of all, we should judge from the following points: 1. Carefully observe whether the air filter itself is dark or black. If the air filter is obviously black, then the air filter should be replaced at this time. 2. Generally, the air filter that is about to break down will be leaky. If it is found, it needs to be replaced. 3. There is a lot of dust around the air filter, so we need to clean the following at this time. If the effect of the filter is not good after cleaning, then it needs to be replaced. Specializing in clean room engineering, clean room materials of clean room partitioning systems、clean rooms false ceiling and stainless steel clean room doors etc.
The ultra-clean workbench is a facility that provides a sterile operating environment for laboratory work to protect the experiment from the external environment, while providing a certain degree of protection for the external environment to prevent contamination and protect the operator. To The ultra-clean workbench can be divided into vertical type, inside-out type and lateral type. In terms of operating quality and environmental impact, the vertical type is superior. The clean air provided by the air supply filter plate descends through the operation area at a specific speed, and is divided approximately in the middle of the operation area. It is sucked by the front air suction hole and the rear suction window, and the air sucked in the lower part of the operation area is mixed. Together, they are pumped into the rear positive pressure zone by a blower. In the upper part of the machine, 30% of the gas is discharged from the top through the exhaust filter plate, and about 70% of the gas is reentered into the operating area through the oxygen filter plate. In order to supplement the air discharged from the exhaust port, the same volume of air is replenished from the room air through the operating port. To Instructions for use of ultra-clean workbench 1. Before using the ultra-clean workbench, apply UV light for 30-40 minutes, and check that all openable doors and windows around the operating area are in working positions. The operation is best carried out in the center of the operating area, which is a safer area in design. 2. Before proceeding with the operation, you should have a preliminary understanding of the experimental materials, and understand the performance and safety level of the equipment you are using. Strictly implement laboratory safety regulations. The use of specific pathogens in any ultra-clean bench must undergo a safety assessment. If the experimental material will cause environmental pollution to the surrounding environment, it should be avoided in the model without exhaust filter plate, because operation in flowing air is no different from dispersing poison. 3. Any advanced equipment cannot guarantee the success of the experiment. The ultra-clean workbench of the animal quarantine laboratory is used for the purpose of sterility and avoiding cross-contamination. Therefore, skilled operation and clear aseptic essentials are essential. To The ultra-clean workbench is a relatively sophisticated electrical equipment, and it is very important to maintain and maintain it regularly. To Clean bench maintenance 1. Keep the room dry and clean. Moist air will not only cause corrosion of manufacturing materials, but also affect the normal operation of electrical circuits. Moist air is also conducive to the growth of bacteria and mold. 2. Regular cleaning of equipment is an important part of normal use. A clean environment can also extend the life of the filter plate. Cleaning should include routine cleaning before and after use a...
1. Required cleaning tools and products (1) Vacuum cleaner for clean room (2), clean paper, dust-free cloth (3), deionized water (4), alcohol (5), bucket (6), mop (7), mop bucket 2. Cleaning requirements (1) Clean room dust-free cloth should be used when cleaning the walls in the clean room; (2) Use 90% deionized water and 10% isopropanol to prepare cleaning agent; (3) Use an approved clean room special detergent; (4) Check the trash bins in the workshop and maintenance room every day and clear them away in time. (5) Every floor must be vacuumed. Every time a shift is transferred, the completion of the work should be marked on the map, such as where it ends and where it starts. (6) Special mop should be used to clean the floor of clean room. (7) A special vacuum cleaner with a high efficiency filter should be used for vacuuming in a clean room. (8) All doors need to be checked and wiped dry (9) Wipe the floor after absorbing the floor. Wipe the wall once a week. (10) Vacuum and wipe under the raised floor. (11) Wipe the pillars and supporting pillars under the raised floor once every three months. (12) When working, we must remember to always wipe from top to bottom, from the farthest place to the door. 3. Clean room cleaning procedures (1) Replace the special anti-static clothing, wear a mask, and remove the dust through the air bath dust collection channel before entering the clean room. (2) After preparing cleaning tools and supplies and placing them at the specified location, start cleaning. (3) Pick up ground garbage, one by one from the inside to the outside according to the order of the production line. (4) Dump and transport the garbage in the trash cans and garbage bins on time, and conduct inspections. After strict classification according to regulations, they will be transported to the designated garbage room for classification and placement after inspection by the production line manager or security. (5) Use clean paper or dust-free cloth from top to bottom to clean indoor glass, walls, shelves, (6) Use a clean dust pusher to push dust and clean the ground carefully from the inside out. If there are garbage, stains, water marks on the ground, etc., clean it with a dust-free cloth in time. (7) Clean up the production line, under the workbench, and under the chairs during the rest and dining time of the production line employees. (8). Regularly clean the ceiling, air-conditioning outlet, ceiling lamp cover, and under the raised floor. The cleaning procedures and materials used must be approved by the factory affairs department, and use holidays and work breaks as planned. (9) The floor waxing of the clean room must be carried out in strict accordance with the plan and cleaning procedures, and anti-static wax must be used. (10) After the completion of the cleaning work, all cleaning supplies must be received in the designated cleaning room, and stored separately from ordinary tools to avoid cross-contamination, and placed neatly and not ...
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