Principle of clean sampling vehicle

Clean sampling vehicle (also known as clean sampling vehicle) is a kind of vertical one-way flow local air purification equipment that can provide local clean environment It can flow flexibly in the workshop, making up for the cleanliness requirements of some spaces which cannot be achieved by fixed laminar flow hood, air purifier and other equipment The clean sampling vehicle is an ideal mobile equipment for sampling and goods delivery in the pharmaceutical and health, biological products, food, electronic industries, etc., and also an essential equipment specified in Article 22 of GMP According to GMP standard requirements, klcfilter's sampling car has a cleanliness level of 10000 (up to 100), and the electric components used at the same time comply with gb1497-85 (electric safety standard) and gb-191 (packaging standard) The structure of the clean sampling car is composed of stainless steel or spray plastic steel plate box The body is composed of prefilter, air supply unit, filter, lighting group, diffuser, combined electrical appliance, caster and other combinations The whole equipment is compact in structure and easy to operate Working principle of clean sampling vehicle: the working principle of clean sampling vehicle adopts the air flow form of vertical laminar flow The variable speed centrifugal fan presses the air filtered by the prefilter in the negative pressure box into the static pressure box, and then the air is filtered by the filter for the second time When the clean air flow from the air outlet of rfilter filter passes through the work area with a certain uniform cross-section wind speed, the dust particles and biological particles will be taken away, thus forming a dust-free and sterile work environment The structure features of the clean sampling car: 1 The upper half of the clean sampling car is the air supply static pressure box, the lower half is the clean area, and the box body is stainless steel The air supply body is equipped with a filter made of ultra-fine glass fiber filter material, a multi wing forward-looking low-noise variable-speed centrifugal fan, and a lighting fluorescent lamp and an ultraviolet sterilization lamp are installed on the diffuser of the air outlet surface In order to facilitate the work and observation of the staff, the baffles on both sides of the operation surface of the clean work area are made of transparent glass, and the front and rear windscreens are made of transparent environmental protection material plastic 2 Variable speed fan system with adjustable air volume is adopted for the clean sampling vehicle By adjusting the input voltage of variable speed fan and changing the working condition of the fan, the average wind speed in the purification working area is kept in the ideal range all the time, which can effectively extend the service life of the main components (air filter) of the clean sampling vehicle and reduce the operating cost of the clean sampling vehicle 3 The ultraviolet sterilization lamp used in the clean sampling vehicle can radiate a strong 2573a short wave ultraviolet It can kill not only the active cells of microorganisms, but also the spores (such as Bacillus subtilis) and other bacterial spores with strong heat resistance In addition, phage and virus can also be destroyed rapidly under the action of UV The installation and use conditions of the clean sampling vehicle 1 The storage place of the clean sampling vehicle shall be far away from the source, ventilated and dry, and the dust particles with the particle size ≥ 0.5 μ m in the air of each liter ≤ 3500 (equivalent to the 100000 class in the United States federal standard 209b) 2 The wind speed of the clean sampling vehicle has been adjusted to a good state (that is, the average wind speed of the clean working area is 0.32m/s-0.48m/s at this time) 3 after the installation of the clean sampling vehicle, The average wind speed in the purification work area can be measured with a tachometer The operating procedures and precautions of the clean sampling vehicle with the wind speed controlled between 0.32m/s and 0.48m/s (regulated voltage) shall be as follows: 1 When using the clean sampling vehicle, turn on the ultraviolet sterilization lamp 50 minutes in advance to deal with the microorganism accumulated on the surface area of the clean sampling vehicle in the purification work area; turn off the sterilization lamp 30 minutes later, Start the air blower 2 for the newly installed or long-term unused clean sampling vehicle, clean the vehicle and the surrounding environment before work, first use the ultra clean vacuum cleaner or the tool without fiber, carefully clean the vehicle, and then use the drug sterilization method or ultraviolet sterilization method for sterilization 3 it is strictly prohibited to store unnecessary articles in the purification work area, In order to keep the clean air flow pattern free from interference 4 Try to avoid disturbing the air flow pattern obviously in the purification work area 5 Measure the average wind speed of the work area with an anemometer regularly (usually once a month) If it is found that it does not meet the technical indicators, adjust the handle of the voltage regulator to change the input voltage of the fan, Make the clean sampling vehicle in good working condition 6 the service temperature of the clean sampling vehicle shall not be greater than 50 ℃ 1 according to the cleanliness of the environment, the filter materials in the coarse filter shall be removed and cleaned regularly The interval is generally 2-3 months In general, when the non-woven filter material contains a lot of dust particles and the surface is blackened, it can be removed for cleaning or replaced 2 Sterilize the environment regularly (usually for one week) 3 Measure the cleanliness of the working area with a dust particle counter every three months, and measure the average colony number of the clean sampling car with a plate method When the technical parameters are not met, find out the cause and repair in time 4 When the input voltage of the blower can not make the average wind speed of the purification work area reach 0.32m/s-0.48m/s, it means that the dust capacity of the air filter tends to be saturated and has failed, and it must be replaced 5 to replace the filter, the cover plate on the top of the clean sampling vehicle must be opened When installing the air filter, the arrow sign shall point to the flow direction, (i.e downward) 6 after replacing the filter, It is necessary to check with the dust particle counter whether the seal around the rim is good It is necessary to use silica gel for plugging Then adjust the input voltage of the fan to keep the average wind speed in the purification area within the range of 0.32m/s to 0.48m/s 7 Otherwise, it will affect the sterilization ability 8 for electrical faults, please refer to the electrical schematic diagram and electrical wiring diagram for maintenance 9 for maintenance and inspection once a month, fill in the instrument maintenance record 10 after each use, clean the instrument immediately, hang corresponding marks, and fill in the instrument use record in time 1 After the reclaiming, brush away the sundries and floating dust in the clean working area with a brush 2 Wipe the dirt and dirt on the inner surface of the working area with a fine soft cloth There is no detergent residue by visual inspection Wipe it dry with a clean cloth 3 Wipe the surface of UV sterilization lamp with gauze and alcohol frequently to keep the surface clean, otherwise it will affect the sterilization ability 4 Effect evaluation: the internal and external surfaces of the equipment shall be bright and clean without stains.