German fischer pump fischer model fischer price

fischer pumps are devices or equipment that use mechanical, physical, chemical, or physicochemical methods to evacuate gas from a chamber to achieve vacuum. In simple terms, a vacuum pump is a device that improves, generates, and maintains vacuum in a closed space using various methods. Based on working principles, vacuum pumps can be basically divided into two types: gas capture pumps and gas transfer pumps. They are widely used in industries such as metallurgy, chemical engineering, food processing, and electronic coating.

fischer pump system structure

The arrangement of the vacuum pump body determines the overall structure of the pump. In vertical structures, the inlet and outlet ports are arranged horizontally, making assembly and pipeline connection relatively convenient. However, the pump's center of gravity is higher, resulting in poor stability during high-speed operation; therefore, this type is mostly used for small pumps. In horizontal pumps, the inlet is at the top and the outlet is at the bottom. Sometimes, to facilitate the installation and connection of vacuum system pipelines, the outlet can be connected horizontally, meaning the inlet and outlet directions are perpendicular to each other. In this case, the outlet can open to the left or right; except for the end connected to the exhaust pipe, the other end is blocked or connected to a bypass valve. This pump structure has a low center of gravity and good stability during high-speed operation. Generally, large and medium-sized pumps adopt this structure. The two rotor shafts of the pump are installed perpendicular to the horizontal plane. This structure allows easy control of assembly clearances, convenient rotor assembly, and a small footprint. However, the pump's center of gravity is higher, gear disassembly and assembly are inconvenient, and the lubrication mechanism is relatively complex.

fischer pump features

1) Large pumping speed over a wide pressure range. 2) The rotors have good geometric symmetry, resulting in low vibration and smooth operation. There are clearances between the rotors and between the rotors and the housing, so no lubrication is required, friction losses are small, drive power can be significantly reduced, and higher speeds can be achieved. 3) No oil sealing or lubrication is required in the pump chamber, reducing oil vapor contamination of the vacuum system. 4) There is no compression in the pump chamber and no exhaust valve. The structure is simple and compact, and it is not sensitive to dust and water vapor in the evacuated gas. 5) The compression ratio is relatively low, resulting in poor pumping efficiency for hydrogen. 6) The rotor surface consists of complex curved cylindrical shapes, making machining and inspection difficult.

fischer pump usage precautions

1) Whether the vibration generated by the vacuum pump during operation affects the process and environment. If the process does not allow vibration, choose a non-vibrating pump or take anti-vibration measures. 2) Understand the composition of the gas being evacuated, including whether it contains condensable vapors, particulate dust, or corrosive components. When selecting a vacuum pump, the gas composition must be known to choose the appropriate pump for the specific gas. If the gas contains vapors, particles, or corrosive gases, consider installing auxiliary equipment such as condensers or dust collectors on the pump inlet pipeline. 3) The vacuum pump must be able to remove all gas generated during the vacuum equipment process at its operating pressure. 4) Combine vacuum pumps correctly. Since vacuum pumps have selective pumping capabilities, sometimes a single pump cannot meet the requirements, and several pumps must be combined to complement each other. For example, titanium sublimation pumps have high pumping speed for hydrogen but cannot pump helium, while triode sputter ion pumps (or diode asymmetric cathode sputter ion pumps) have certain pumping speed for argon; combining them results in better vacuum levels for the vacuum device. Additionally, some vacuum pumps cannot operate at atmospheric pressure and require pre-vacuum; some vacuum pumps have outlet pressures below atmospheric pressure and require a fore pump; therefore, pumps must be combined. 5) Requirements for oil contamination in vacuum equipment. If the equipment strictly requires oil-free operation, various oil-free pumps should be selected, such as water ring pumps, molecular sieve adsorption pumps, sputter ion pumps, and cryogenic pumps. If the requirements are not strict, oil-sealed pumps can be chosen with additional anti-oil contamination measures, such as adding cold traps, baffles, and oil mist traps, to meet clean vacuum requirements. 6) Correctly select the operating point of the vacuum pump. Each pump has a certain operating pressure range; for example, the operating pressure range of the 2BV series water ring vacuum pump is 760mmHg~25mmHg (absolute pressure). Within this wide pressure range, the pump's pumping speed varies with pressure (refer to the pump performance curve for detailed changes), and its stable operating pressure range is 760~60mmHg. Therefore, the pump's operating point should be selected within this range, and it should not operate long-term under 25~30mmHg. 7) The impact of oil vapor discharged from the vacuum pump on the environment. If environmental pollution is not allowed, select an oil-free vacuum pump or discharge the oil vapor outdoors. 8) The operating pressure of the vacuum pump should meet the ultimate vacuum and operating pressure requirements of the vacuum equipment. For example, if a vacuum drying process requires a working vacuum of 10mmHg, the selected vacuum pump's ultimate vacuum should be at least 2mmHg, and preferably reach 1mmHg. Typically, the pump's ultimate vacuum should be half an order of magnitude to one order of magnitude higher than the vacuum equipment's working vacuum.

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