What is an Oil-free Diaphragm Vacuum Pump? This Article is Enough!


An oil free diaphragm vacuum pump is a device that uses various methods to improve, generate and maintain vacuum in a closed space. According to the working principle of vacuum pumps, vacuum pumps can basically be divided into two types, namely gas capture pumps and gas transmission pumps. It is widely used in industrial automation, physical and chemical experiments, medical treatment, metallurgy, chemical industry, food, electronic coating, and other industries. Let's share with you the application knowledge of oil free diaphragm vacuum pumps.


Working Principle of Oil-free Diaphragm Vacuum Pump

The working principle of an oil free diaphragm vacuum pump is composed of main parts such as stator, rotor, rotary vane, cylinder, and motor. The rotor with the rotary vane is installed eccentrically in the fixed cylinder. When the rotor rotates at high speed, the four radially sliding rotary vanes in the rotor slot divide the pump cavity into four working rooms. The cylinder wall separates the inlet and outlet of the stator, rotates, again and again, changes the volume, and discharges the inhaled gas from the exhaust port, so as to achieve the purpose of pumping.



The oil free diaphragm vacuum pump is a mechanical vacuum pump that can run without any oil for lubrication. The oil free diaphragm vacuum pump has good durability. It is a vacuum pump, compression, and dual-purpose vacuum pump. It is basic equipment for obtaining a vacuum in a very wide range of applications. Compared with oil pumps, oil free diaphragm vacuum pumps have a low vacuum and small pumping capacity, but are small in size, easy to install, simple to maintain, easy to move, do not produce oily fumes, and do not pollute the environment, especially in the demanding scientific research, medical beauty And other industries use. It is also one of the most common equipment in the laboratory.


There is a large range from atmospheric to extremely high vacuum, and so far there is no vacuum system that can cover this range. In order to achieve the process indicators of different products, work efficiency and equipment working life requirements, different vacuum sections need to choose different vacuum system configurations.


Specific Application Industries of Oil-free Diaphragm Vacuum Pumps

(1) Leak detection test of various containers under vacuum.

(2) Gas analysis and physical and chemical experiments in universities, research institutes, factories, and mines laboratories.

(3) Supporting the use of various medical instruments, etc.

(4) Supporting the use of various medical machinery automatic lines.

(5) Airtightness test of the surface of the object under vacuum.

(6) Vacuum suction pulls out the bag and fills the material on the automatic packaging line.

(7) Photographic plate making under vacuum suction and fixation.

(8) Use pressure difference to guide gas analysis under vacuum.

(9) The label of cartons and bottles is vacuum sucked and pasted.

(10) Vacuum chuck fixture for non-magnetic parts clamping on processing.

(11) Vacuum forming of various plastic products.

(12) Application on food processing machinery.

(13) Vacuum distillation and drying in medicine factories.

(14) Vacuum suction in hospital operating room.

(15) Vacuum suction and feeding of paper on printing machinery.

(16) High-efficiency vacuum filling in which various liquids are injected into the bottle.


When Selecting an Oil-free Diaphragm Vacuum Pump, Consider the Following Factors

(1) The working pressure of the pump meets the ultimate vacuum and working pressure requirements of vacuum equipment.

(2) The working point of the pump. There is a certain working pressure range.

(3) Under its working pressure, the pump should exhaust all the gas generated during the process of the vacuum equipment.

(4) Vacuum pump unit. Due to the selective extraction of vacuum pumps, it is necessary to combine several pumps to complement each other to meet the pumping requirements. Some vacuum pumps cannot work under atmospheric pressure and need to pre-vacuum; some vacuum pump outlet pressure is lower than atmospheric pressure, and a backing pump is required, so it is necessary to combine the pumps for use.

(5) The requirements of vacuum equipment for oil pollution. If the equipment is strictly required to be oil-free, various oil-free pumps should be selected, such as water ring pumps, molecular sieve adsorption pumps, sputtering ion pumps, cryogenic pumps, etc. If the requirements are not strict, you can choose to have an oil pump, plus some anti-oil pollution measures, such as cooling traps, baffles, oil traps, etc., which can also meet the clean vacuum requirements.

(6) Know the composition of the gas to be pumped. The gas contains no condensable vapor, particle dust, corrosiveness, etc. When choosing a vacuum pump, you need to know the gas composition and select the appropriate pump for the gas to be pumped. If the gas contains steam, particles, and corrosive gases, you should consider installing auxiliary equipment, such as condensers, dust collectors, etc., on the inlet pipe of the pump.

(7) How does the oil vapor discharge from the vacuum pump affect the environment? If the environment does not allow pollution, you can choose an oil free diaphragm vacuum pump, or exhaust the oil vapor outdoors.

(8) Whether the vibration generated by the vacuum pump has an impact on the process and the environment. If the process does not allow, choose a vibration-free pump or take anti-vibration measures.

(9) The price, operation, and maintenance costs of the vacuum pump


Use and Maintenance of Oil-free Diaphragm Vacuum Pump

(1) There is enough surrounding space to facilitate the inspection, maintenance, assembly, and disassembly of the pump.

(2) The pump must be installed on a flat surface.

(3) No water, oil or other liquids will fall on the pump.

(4) Not directly exposed to sunlight.

(5) It should have adequate and good ventilation conditions and an ambient temperature below 40°C.

(6) A clean place free of dust and dirt.

(7) When connecting wires, pay attention to the specified wiring requirements on the motor nameplate. For three-phase electric pumps, note that the direction of rotation of the motor should be consistent with the direction of the arrow marked on the pump.

(8) It must be ensured that the pump does not cause vibration due to an unstable foundation.

(9). The pipeline connecting with the pump should not be too long or smaller than the inlet diameter of the pump, which will affect the pumping speed. At the same time, check whether the vacuum connecting pipeline has leaks.

(10). It is best to install the pump on a hard foundation similar to concrete. If there are no conditions, the pump can also be firmly installed on a steel or wooden frame.



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