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  • Clean room self-cleaning time detection

    Clean room self-cleaning time detection

    Jan 23, 2021

    1. What is self-purification time? Self-cleaning time, in English, cleanliness vecoverly characteristic, refers to the time when the cleanliness air conditioning system starts to operate to return to a stable and regulated indoor cleanliness level after the clean room is polluted. 2. How is the clean room's self-purification time tested? Clean room self-purification time 1. The clean room self-cleaning time detection is suitable for non-unidirectional flow clean rooms. 2. The clean room self-cleaning time detection should use artificial dust sources such as atmospheric dust or smoke generators as the benchmark, and should be detected by a particle counter, and the following requirements should be met: (1) When taking atmospheric dust as the reference, the side must stop the clean room for a considerable period of time. When the indoor dust concentration is close to the atmospheric concentration, measure the dust concentration in the clean room near the return air outlet, then turn on the machine, and read it regularly. (Generally, it can be set to read once every 6S), until the dust concentration at the return air outlet returns to the original stable state, record the required time (t). (2) When the artificial dust source is used as the reference, the smoke generator should be placed in the center of the room above 1.8m from the ground, and the smoke should be stopped after 1 to 2 minutes, and then wait 1 minute to measure the dust concentration in the clean room near the return air outlet ( N0). Then boot, the method is the same as above. 3. From the initial concentration (N0), the indoor stable concentration (N), and the actual number of air exchanges(n), the calculated self-cleaning time (t0) can be obtained, which is compared with the actual self-cleaning time (t), if t≤1.2t0 , Is qualified. 4. Self-cleaning time method In addition to the above methods, there are also particle concentration change rate evaluation methods. The self-cleaning time detection method should be negotiated and determined. Welcome to inquiry sliding doors for clean room、cleanroom wall partitions、clean rooms false ceiling and cleanroom ceiling grid system etc.

  • Discussion on Air Flow in Clean Room

    Discussion on Air Flow in Clean Room

    Jan 23, 2021

    The cleanliness of a clean room is often affected by airflow. In other words, the movement and diffusion of dust produced by people, machine compartments, and building structures are dominated by airflow. The clean room uses HEPA and ULPA to filter the air, and its dust collection rate is as much as 99.97~99.99995%, so the air filtered by this filter can be said to be very clean. However, in addition to people, there are sources of dust in the clean room, such as machines. Once the generated dust spreads, the clean space cannot be maintained. Therefore, airflow must be used to quickly discharge the generated dust outside. Wind speed control The airflow in the clean room is an important factor affecting the performance of the clean room. Generally, the airflow speed of the clean room is selected between 0.25~0.5m/s. This airflow speed belongs to the breeze area, which is susceptible to interference by people, machines, etc. and tends to be chaotic. , Although increasing the wind speed can suppress the influence of this disturbance and maintain cleanliness, the increase in wind speed will affect the increase in operating costs. Therefore, it should be able to supply at the most appropriate wind speed when the required cleanliness level is met. Achieve appropriate wind speed supply to achieve economic results. On the other hand, in order to achieve a stable effect of clean room cleanliness, the maintenance of uniform airflow is also an important factor. If uniform airflow cannot be maintained, it means that the wind speed is different. Especially on the wall, the airflow will generate vortex along the wall. Achieving high cleanliness is actually very difficult. To maintain a uniform air flow in the vertical laminar flow direction, it must be:  (A) There must be no difference in speed in the wind speed on the blowing surface; (B) There should be no difference in the wind speed on the suction surface of the floor return air plate. If the speed is too low or too high (0.2m/s, 0.7m/s), there will be eddy currents. At a speed of 0.5m/s, the airflow is more uniform. Generally, the wind speed of a clean room is 0.25~0.5m. /s between. Influencing factors There are many airflow factors that affect the clean room, such as process equipment, personnel,clean room assembly materials, lighting appliances, etc. At the same time, the diversion point of the airflow above the production equipment should also be considered. Generally, the air flow diversion point on the surface of the operating table or production equipment should be located at the distance between the clean room space and the clean room partition wall 2/3, so that the air flow can flow from the inside of the process area to the work area when the operator is working. The dust is taken away; if the diversion point is placed in front of the process area, it will become an improper air flow diversion. At this time, most of the air flow will flow to the process area, and the dust caused by the opera...

  • How to install the air filter in the hospital operating room

    How to install the air filter in the hospital operating room

    Dec 01, 2020

    Hospital operating rooms have very high environmental requirements. How is the air filter installed in the hospital operating room? Today we will introduce the installation principle of the air filter in the hospital operating room. To An air filter in a hospital operating room generally consists of two parts: three air conditioners and two purifiers. The working principle of medical air filters is divided into eight parts: Part 1: Return air section The return air section means that the air volume sent by the exhaust fan reaches the specified air volume, and the recovery system of the medical air filter can send out air. Part 2: Primary filtration Primary filtration is the first filtration procedure performed by non-wind. In this step, we need to replace or clean the equipment for a certain period of time. Part 3: Heating process The heating process is generally an electric heating process used for heating in winter. Part 4: The humidification stage of the medical air filter The humidification stage is mainly to humidify the blower unit through a humidifier, and then reach the temperature for people's affairs. Part 5: Secondary Filtration This is the final filtration stage of the air filter in the hospital operating room. This stage is the final pass to ensure air quality. The air is filtered once, then humidified, and finally filtered again. This ensures the purity of the air and can achieve the medical air filtration effect. Then the filtered air is output. Welcome to inquiry clean room doors&windows、cleanroom wall partitions、cleanroom ceiling grid system、clean room equipment etc.

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