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Structural characteristics of the air sampling pump: The pump body includes a motor. The motor we use is an eccentric motor. The working principle of the eccentric motor is that the motor drives the eccentric wheel to rotate and reciprocates the air diaphragm inside the pump through a mechanical device so as to compress the air in a fixed volume pump cavity, Stretching to form a vacuum (negative pressure), generating a pressure difference with the outside atmospheric pressure at the air inlet of the pump, and drawing gas into the pump cavity under the action of pressure difference, and then discharging the air from the exhaust port. The flow rate of the inhaled gas depends on the motor speed Of the speed to control the installation of a pressure sensor at the outlet pipe to sense the pressure of the trachea. The motor rotates the shaft to drive the eccentric wheel to rotate at a constant speed. The bigger the eccentricity is, the larger the stroke of the pump is. The more the gas is drawn each time, the larger the starting torque is. Therefore, to find the proper motor and eccentric distance to balance the minimum flow rate With the highest flow rate. According to the motor parameters, speed, torque, voltage selection motor. We use the motor model is 236661,20W, 12V when 4660rpm. Eccentric eccentric distance with 0.8mm, 1.0mm, 1.5mm, 1.6mm, 2.5mm. In order to avoid the motor speed is too large may idle, the motor rotating shaft made a gap, the rotating shaft fixed on the eccentric, to ensure that the motor driven eccentric wheel together, and then bring the pump on both sides of the film up and down motion bearing fixed Eccentric wheel. Air sampling pump operation Note: (1) bearing the attention should be flat, then press, then find a platform, leveling well. After the bearing when fitted to the eccentric, pay attention to the bearing is placed in front of, to find a good location, but also leveling, so that the center of the two bearings (in a straight line). There are self-screws left out in the above, the following is the two relative bearings, then you have to use calipers to measure the total diameter, and then respectively measure the radius of the two sides, take a look at the center of the bearings are not, adjust the Finally, use glue to fix the bearing. (2) When the eccentric wheel to the motor when the pole (to put the bearing rod on both sides), you can see the pole has a tilting table children, then to align the platform self-screw eccentric Screw up, fixed well. (3) the center of the standard, and then the two sides of the flat cover to the bearing rod, pay attention to set and then set aside, as attached to the eccentric, so the bearing rod is moving back and forth, so do not put on the end Pressure in the bottom, so it is easy to make the two bearings off center, to the two black film must be all the bearings, and then a support fixed to the bearing, both are so fixed, to prevent the motor shaft to the Press crooked, damage to the motor. (4) Flat cover above also put on the plastic film and aluminum platform, screwed together, the film edge along the mold edge to avoid pressure or seal is not good. After the installation of gas outlet and the top cover. Air sampling pump Note: (1) intake air cover above the two small film, one for intake, one for the outlet, according to the press from the middle, according to flat, according to strict, can not have a supporting part , Otherwise leak, then ease the film, pay attention to the size of the cavity, do not An anti. Buffer film also press from the middle, according to strict, can not leak. (2) the side of the suction side of the chamber is larger than the exhaust side, the shell also has a film, the shell of the chamber and membrane play a buffer role, once the exhaust or exhaust there is a temporary block, not smooth, it Can help buffer (that is, there is a range of pressure alarm, not fixed, change the value of the alarm, its buffer can be compensated in the subsequent exhaust or exhaust back). The lids on both sides are the same, but with a different barrier, one end has a long exhaust port and a short exhaust port; the other end is not. Installation should pay attention to the isolation layer and the lid, because the sub-size so be sure to align again, otherwise it will not play the role of isolation, and closed before to confirm good, on both sides of the two black rubber gasket In the absence of the rubber gasket easy to bounce, so hang the screws, hand squeeze the gasket side, then tighten the screws. Screws should be evenly screwed, and finally with a tight, see the end of the screw cap is flat, whether there is a leak. But note that it is best not to screw back on after screwing, so easily lead to leaks. (3) to the lid and insulation layer security membrane: to be very careful, the seal is good or bad is the key. The sealing film on the lid is first centered on the middle edge and then parallel to the edges on both sides of it. Then it will be perpendicular to the upper and lower ribs in the middle and will follow the principle of rushing from the center to both sides. The barrier film is two small rectangular film, one deep (try to enlarge suitable small, no flash film, so as not to leak), one side of the shallow, are fixed by the three rods. First set the film to the pole child, then use the word screwdriver from the middle to both sides of the pressure rod on both sides, let the film into the set, followed by pressing the middle of the rough place, and then see if there is no fitting light Close place (pressure changes at the same time).