A rotary vane vacuum pump is a type of variable capacity mechanical vacuum pump that uses a rotary motion of a rotor and a vane that slides in a rotor slot to achieve a vacuum. When the task of liquid to stop smooth and fill the pump cavity, separating the exhaust valve and the atmosphere, the so-called oil seal rotary vane vacuum pump. No task liquid, that is dry rotary vane vacuum pump. In the oil seal vane vacuum pump, the international habit of belt drive for the rotary vane vacuum pump, and the pump indirect connection with the motor or with a coupling called the direct rotary vane vacuum pump. In each pump, there are single and two points. In single-stage pumps, the ultimate pressure and usefulness of the pump are also different due to the different constructional options and parameters. Their common feature is the structure is more complex, easy to use, can start from atmospheric pressure, can be indirectly discharged into the atmosphere, the fair quality of small, easy maintenance, two-stage pump ultimate pressure of 6 * 10-2 ~ 1 * 10- 2Pa, a single-stage pump up to about 4Pa, the other single-stage pump is about 50 ~ 200Pa. In the pump structure, in order to stop the pump to avoid back to the oil, and some can automatically cut off the oil check valve, and some with intake channel shut-off valve, and some in order to open the pump in the gas town Suddenly cut off gas automatically when the power cut to maintain the vacuum pump port and control structure. In the annex, a demister, breath filter, obstruction of broken glass and other debris with a population filter, dust filter, steam trap, chemical trap, there is control of the pump temperature to improve the water vapor extraction rate and maintenance pump The temperature control of water conditioning valve. Also introduced the oil filter, can monitor the oil temperature, oil pressure, oil and other electronic displays, or even with the computer, stop the automatic control, the use of forced smooth and air-cooled, the pump continued mission population pressure of 10KPA, or even Higher, the same pump is therefore more applicable. Two-stage rotary vane vacuum pump, can be widely used in refrigerators, air conditioners, bulbs, fluorescent lamps, bottle gall consumer and electronics, metallurgy, medicine, chemicals, oil filters, printing machinery, packaging machines and other industries, Pumps, molecular pumps and other fore pump, for electronic equipment, medical equipment and other supporting and experimental discussion. As the straight-line pump without belt friction dust purification, small size, light weight, waste of information, the function is maturing, more commonly used. First, the suction principle and structure Rotary vane vacuum pump, which has a fair and equidistant rotor in the stator cavity and rotor slot two or several rotary vanes, the rotor and the casing inside or outside the surface tangent or intersect, the rotor driven When the rotary vane is rotating, the rotary vane leans on its heart force (some also has the spring force) to the cylinder wall to connect the intake and exhaust ports, and the intake chamber container is cyclically expanded and inhaled, and the exhaust chamber volume is in a period To reduce and deflate gas sex, gas and oil pressure to open the exhaust valve exhaust to obtain a vacuum. Two-stage pump consists of two single-stage series, the intake pressure is high, the ordinary medium-sized pump, two can exhaust at the same time, the inlet pressure is low, the gas discharged from the primary low, and then discharged from the pump. As the pump is used to change the suction volume to suck the gas, the nominal pumping speed according to the geometric volume of the inspiratory design and calculation. Second, gas-town principle and structure As the vacuum pump pumping process is a contraction process, so when there is steam condensable gas like gas, if the discharge pump chamber to reach its saturated steam pressure, it will condense in the oil , So that the pump oil emulsified metamorphic, smooth sealing function worse, condensate in the suction chamber will be re-turned into a gaseous state, so that reduced the degree of vacuum. It is reported that when the water content exceeds 50%, it will also destroy the smooth function, resulting in frequent oil change and waste. After discussion, created a gas pump town. The principle is that the exhaust chamber pressure is divided by the partial pressure of air and steam partial pressure of two parts, as long as the sum of the two is sufficient to restrain the atmospheric pressure and elastic exhaust valve, the only time exhaust. The function of the gas ballast valve is to fill the exhaust cavity of the pump with a certain amount of air prior to the onset of the exhaust gas so as to reduce the partial pressure of steam in the exhaust gas pressure and when it is lower than the saturated vapor pressure under the pump temperature With the filling gas discharge pump, and to prevent condensation in the pump oil. In addition, when the closed pump operation, has been mixed with the condensable gas condensable gas or gas phase will be dissolved in the oil material, which will escape from the pump chamber, then open the town if the task, Can also be removed a certain amount of condensable substances, which play a role in pollution, extending the use of pump oil. Vacuum pump oil is more expensive, the supply is also unlimited, so the rational use of gas town has great economic significance. In the structure, the gas valve has a check valve to prevent the exhaust gas, gas and gas from the town hole discharge, the amount of gas designed to adjust the amount of gas and gas can be obtained at different pressures limit the town gas valve to open to facilitate the move to Pump suitable position, to complete the far interval operation. Gas ballast valve can reduce the micro-gas leakage, but also can be used as a deflation valve when the pump to stop or delay to stop the pump back to the oil. Gas volume and the pump geometry pumping speed, the geometric volume of air entrained gas-hole size, the size of the gap. Gas pressure limit and the pressure of the town is not the town gas pressure limit and the oil circuit design, and the gas volume related. Habitually there are "oil-immersed" and "oil-sealed" points. The former refers to the body immersed in the tank, its advantages are: many require airtight parts and components can be sealed by means of oil; easy to set to avoid stopping pump back to the oil body; Improve the gas town function, but also make the pump at a higher inlet pressure more secure mission. Others are called "oil seal", meaning that only the exhaust valve immersed in the oil, the exhaust port sealed with oil. In accordance with the rotor position of fairness, justice has the so-called fair and fair share of the points. Fair just above is just fair and fair on the positive side. The advantages of side fairness are: lower oil level, less oil quantity, less oil return to pump, smaller starting power and auxiliary power, more convenient for overhauling and maintenance of exhaust valve. Pay attention to the demolition process should be vertical method. On the fair structure, demolition can be used flip method, the application of rotor weight to find the demolition status. On the two-stage pump, upper and lower secondary rotor convergence methods and support methods are also different: one is four support, fork connection: the other is two bearings. Key connected drive. In the two bearing structure, the low-level rotor is mostly a structure with an inner hole, and is also useful for extending the journal on the side of the middle wall of the primary rotor as a low-level rotor. If the lower rotor diameter and the primary rotor on the contrary, the use of positive groove does not wear the shaft mode, the rotor diameter and cylinder mirror should have a larger ratio. When using the positive groove wear axis method can be smaller. At this point the rotor is grooved at one end and flanged at the other end. Some people also use two different levels to take different values, different diameter and rotor diameter approach. Or the use of lateral deflection groove structure. Due to the selection of different structures, the pump disassembly is not the same, the user must carefully read the use of instructions to prevent damage to the pump. On the primary rotor, where high-speed direct joint structure, consider the impact of dynamic equilibrium, should adopt a solid way. About low-speed pump, larger rotor, to increase the weight, should adopt the hollow way. The rotor has all, all through the shaft, splicing, welding and other constructions. A commonly used international structure is composed of two halves of the rotor plus two rotor plate with screws and splicing. A new structure is a rotor plate with a rotor splicing, with good rigidity, working hours, the advantages of good shape and position tolerance. Before using the dual-stage rotary vane vacuum pump, carefully read the product manual and check the shipping quality after unpacking. Collect the spare parts and technical documents and remove the exhaust port guard. According to the requirements device, wiring, test turn, water-cooled pump water. In order to avoid fuel injection due to the return and reverse rotation, the pump port should be opened first, and the pump oil should be turned to the fuel tank by hand to check the oil level at the same time, which should be above the oil standard center, but not full To release. Discriminant steering adjuvant approach. Pour the sheath on the pump port, such as after the pump was sucked, is positive, was blown off, is the reverse. Normal sound is positive, abnormal sound is the opposite. Such as the pump port equipped with inflatable solenoid valve, the general should be cross-loaded, and move with the pump at the same time. Gas ballast valve should be used when the absolute temperature is too high or condensable steam containing water vapor and other gases is pumped. According to the instructions recommended vacuum pump oil. Pay attention to vain vacuum pump oil can not be mixed with mineral oil vacuum pump oil and other oils, must be severely cleaned before entering the vain vacuum pump oil. Check the pressure limit pump to compact mercury vacuum gauge shall prevail. Full pressure gauge should pay attention to accountant and regulatory paired calibration and backup alignment regulation. It is recommended that a ball valve be installed between the regulated and the pump under test, and that the valve be closed when the pump is not in use, which can be extended to regulate the operation. Two-stage rotary vane vacuum pump maintenance
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