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Pump is a wide noodle substantial general-purpose machinery and equipment, it is widely used in petroleum, chemical, power metallurgy, mining, ship selection, light industry, agriculture, civil and
Defense departments, in the national economy played an important role. According to statistics of 79 years, our country pump output reached 1,256,000 units, mainly in the category Centrifugal pumps Everyone probably knows, but also a variety of pumps may be more upset that they still use very broad, such as: aluminum nitrate magnesium nitrate pump pump pump iron nitrate denitrification Acid copper zinc nitrate pump pump pump mercury nitrate nitrate silver nitrate ferrous pump pump pump LiBr potassium bromate bromine water pump pump pump zinc bisulfite sodium pump linoleic acid
Linoleic acid nicotine lead pump pump pump pump nicotinic acid hydrochloride, aniline hydrochloride pump pump pump Ethanol Ethylbenzene Ethyl chloride pump acid pump pump pump acetylene stearic acid pump> oleic acid pump Sucrose in distilled water pump original pump pump pump potassium dichromate sodium dichromate detergent pump pump pump barium nitrate calcium nitrate potassium nitrate pump pump pump and so on These are a Points, the following is mainly to talk about all kinds of vacuum pump working principle
CG-17 three-glass high vacuum oil diffusion pump GG-17 glass of low expansion coefficient, better tolerance to high temperature difference variable, so the pump than the same type of pump can stand high temperature and also a longer service life. Relevance of the pump Used in electronic industry, such as tubes. Kinescope. X-ray tubes, as well as the purification of semiconductor silicon smelting, high boiling point oil distillation purification separation, fluorescent lamps, Vacuum Flask High Vacuum exhaust equipment. Working Principle By turning the system be able to get into vacuum pump 10-2Pa diffusion pump oil is heated boiling in order to speed the oil from the exhaust steam flow to keep the system within the gas molecules to the pump side Crook of the arm tube assembly foam Department when the gas density of the scope of work of mechanical vacuum pumps were out, and then to gradually obtain a high vacuum. Water Ring Vacuum Pump / liquid ring vacuum pump working principle Water ring vacuum pump (the water ring pump) is a rough vacuum pump, which can limit access to a vacuum for the 2000 ~ 4000Pa, tandem atmospheric jet up to 270 ~ 670Pa . Water ring pumps can also be used as compressor, known as the water ring compressor, are belong to low-pressure compressor, the pressure range of 1 ~ 2 × 105Pa stress table.
Water ring pump was originally used as a self-suction pumps, and then gradually for the petroleum, chemical, machinery, mining, light industry, medicine and food and many other industrial sectors. In industrial production Many processes, such as vacuum filter, vacuum water, vacuum feed, vacuum evaporation, vacuum concentration, vacuum and vacuum degassing resurgence and so on, water ring pumps have been Wide range of applications. Vacuum because of the rapid development of application technology, water ring vacuum pump in the rough access has been valued by people. Because of water ring pump gas compression are Isothermal, and it can be pumped in addition to flammable, explosive gas extraction can also dust, water content of gases, therefore, the application of water ring pumps increasing.
Equipped with a pump body in at the right amount of water as a working fluid. When the impeller according to the figure clockwise rotation, the water was thrown around the impeller, because of the role of centrifugal force, water-shaped Decided to become a pump cavity of similar shape, such as the thickness of the closed circle. The next part of the water ring coincided with the inner surface of the impeller wheel Tangent, water ring of the upper part of the inner surface Coincides with the leaves of the top contact (in fact the leaves in the water ring must have the insertion depth). At this point the impeller wheel and the water loop to form a crescent-shaped space between, and This space has been divided into the impeller and leaves an equal number of a number of small cavities. If the impeller bottom 0 ° as a starting point, then the impeller rotating at 180 ° before the small cavity Volume by the small size, and with the side surface of the mouth to inhale the same, when the gases are inhaled, when the suction end of a small cavity with the mouth inspiratory isolation; when the impeller continues to rotate Small cavity by small changes, so that the gas is compressed; When a small cavity connected with the exhaust port, the gas will be discharged outside the pump.
To sum up, water ring pumps are pumps on the change of cavity volume inspiratory implementation, compression and exhaust, so it belongs to varactor vacuum pump.
Roots pumps working principle: Roots pump at pump cavity, has two "8" shape of the rotor perpendicular to the installation at a pair of parallel-axis by the transmission ratio for a pair of one for each Reverse Driven Gear Synchronous rotation exercise. At the rotor between the rotor and pump between the shell wall, maintaining a certain gap, you can achieve high speed operation. Because of a Roots pump Vacuum without internal compression, the compression ratio is usually very low, so high, medium vacuum pump required before class. Roots vacuum pump in addition to the limit depends on the pump itself, the structure and manufacture of precision Thought, but also depends on the limits of the former class vacuum pump. In order to enhance the limit of vacuum pumps, Roots Vacuum Pump can be used in series.
Roots pumps working principle is similar with Roots Blower. Because of the continuous rotor rotation, has been pumping gas from the inlet to the rotor and pump inhalation shell space between v0, the Re-emitted by the exhaust port. Because of breathing space after the v0 are fully closed state, therefore, not at the gas pump cavity compression and expansion.
However, when the rotor turned at the top edge of exhaust port, v0 the same space and the exhaust side, the exhaust side because of higher gas pressure, then there is a part of the gas back into the space v0 Medium Go, so that a sudden increase in gas pressure. When the rotor continues to rotate, the gas discharge pump. Rotary Vane Vacuum Pump Principle Rotary Vane Vacuum Pump (referred to as rotary vane pump) is a mechanical vacuum pump oil seal. Its working pressure range of 101325 ~ 1.33 × 10-2 (Pa) belong to the low vacuum . It can be used alone, but also can be used as high-vacuum pumps or other ultra-high vacuum pump before the class. It has been widely used in metallurgy, machinery, military, electronics, Chemical industry, light industry, oil and pharmaceutical production and scientific research departments. Rotary vane pumps can be sealed container extraction in the dry gas, with gas if the town of devices can also be drawn in addition to a certain amount of condensable gas. But it was not suitable for oxygen extraction have been High, there is corrosive to metal on the pump oil from a chemical reaction, as well as gas containing dust particles. Rotary vane vacuum pumps are the most basic vacuum technology, one of access to equipment. Rotary vane pumps for many small and medium-sized pump. Rotary vane pump has a single-stage and dual-class two. The so-called dual-class, that is, At the structure will be two single-stage pumps in series together. Dual class generally do more in order to obtain a higher vacuum. Rotary vane pump of pumping speed and pressure of the relationship between the entrance requirements are as follows: pressure at the entrance to 1333Pa, 1.33Pa and 1.33 × 10-1 (Pa), its pumping speed values shall be separately Lower than the nominal pumping speed of pump 95%, 50% and 20%. Rotary vane pump by pump body, rotor, rotary vane, end caps, springs and other components. At rotary vane pump cavity eccentricity to install a rotor, rotor cylindrical surface with the pump cavity
Tangent (both have a very small space), equipped with the rotor shafts of the two rotary vane spring. Spins, by centrifugal force and spring tension so that the top and the rotary vane pump cavity
Wall to maintain contact, rotor rotation Driven Rotary Vane sliding along the wall cavity pump.
Put two rotary vane rotor, a pump chamber and two end caps surrounded by crescent-shaped space divided into A, B, C of three parts, when the rotor rotates in accordance with the direction of the arrow, and inspiratory mouth Connected space A Volume are gradually increased, and are in the process of breathing. Connected with the exhaust port of the space C of volume are gradually shrinking, and are in the process exhaust. The middle space
Between the B volume is gradually reduced, is in the compression process. A space because of the volume are gradually increased (ie, swelling), reduce the gas pressure, pump at the entrance to
External gas pressure is greater than the pressure inside the space A, so the gas inhalation. When the space A with the inspiratory port isolation, that is, to the location of the space B, the gas began to be pressure Shrinkage, the volume is gradually shrinking, and finally connected with the exhaust port. When more than the exhaust pressure compressed gases, the exhaust valve was open compressed gases, the gas through the fuel tank inside Pai reservoir to the atmosphere. Continuous operation by the pump to achieve the purpose of continuous ventilation. If the exhaust gases through the airway and transferred to another class (low vacuum level), by Low Vacuum class away, and then compressed by the low vacuum level back to the atmosphere, that is composed of a two-stage pump. Then the total compression ratio from 2 to burden, and thus enhance the limit Vacuum.