Filtration Principle and Structural Features of Vacuum Pump

Vacuum filtration is the process that separates a solid from a liquid through a filter element. It is the vacuum that creates the force pulling the liquid through the filter while the solids stay on the surface of the filter. And vacuum pump is one of the important parts of the vacuum filtration system by providing the force of the vacuum.

Diaphragm pump which is also called membrane pump is the ecological replacement for water jet pumps in modern labs. To avoid wasting water or oil, diaphragm pumps utilize a dry compression process.

You can find two different kinds of Hawach vacuum filtration pumps, standard diaphragm vacuum pumps, and anti-corrosion diaphragm vacuum pumps, with the ideal vacuum degree, high airflow rate, and high working efficiency as while.

Filtration Principle of Vacuum Filter

Within 10 seconds after the vacuum pump is started, the vacuum negative pressure tank can be pumped into a negative pressure chamber of not less than 91.2KPa (68.4 mmHg), and then the solenoid valve 3 or 5 is connected to the pressure difference under the action of, the liquid in the filter tray can quickly penetrate the filter paper to achieve the purpose of dehydration.

SLVPGM050A-T-Anti-Corrosion Diaphragm-Vaccum-Pumps SLVPGM033A-Standard-Diaphragm-Vaccum-Pumps (1)  SLVPGM050B-Standard-Diaphragm-Vaccum-Pumps

Structural Features of Vacuum Filter

The machine is simple in structure and compact, and the vacuum system is reliable and has a relatively high degree of vacuum. In order to prevent the liquid in the vacuum negative pressure tank from entering the vacuum pump, the upper and lower contacts are set in the device. When the liquid reaches a predetermined degree, the vacuum pump is used. It will stop automatically, open the bleed solenoid valve at the same time, and start automatically after the liquid is drained. When filtering, the particles are absorbed in the pores after entering; sieve filtration means that the solid particles are easy to pass through once samples are small, and the filter medium cannot absorb solid particles infiltration process.

The diaphragm vacuum pump is a vacuum pump with dry operation and relatively low vacuum. The working principle is to change the volume of the diaphragm chamber by reciprocating the stretching-compression diaphragm, and then switch the gas path with the one-way valve to complete the vacuum extraction function. Since the rubber diaphragm itself is large in elasticity and cannot completely exhaust the gas, the vacuum degree of the diaphragm vacuum pump is generally not higher than 200 Pa, but it has the advantages of small volume, lightweight, convenient use, and the like, and all components in contact with the gas pass through. After the anti-corrosion treatment, the chemical corrosion resistance of the vacuum pump can be completely solved. It is especially suitable for applications requiring chemical resistance or long-term uninterrupted operation. It is mainly used in the food, chemical, pharmaceutical, aerospace, and automotive industries. The rubber diaphragm is a key component of the diaphragm vacuum pump. The use of long time and high vacuum requires higher requirements for the material of the diaphragm and the design of its related components.

Resistance to Strong Corrosion

Before purchasing products, you should pay attention to whether the filtered liquid will volatilize corrosive gas. If it is not corrosive or volatile, you can choose conventional products; if so, you should buy a vacuum filter device that is resistant to strong chemical corrosion, otherwise, it will corrode the internal parts of the vacuum pump, especially the air inlet and outlet valves. For example, it is recommended to use anti-corrosion diaphragm vacuum pumps.

Internal Structure of Vacuum Pump

The main part of the vacuum pump equipped with it is made of PTFE polytetrafluoroethylene material, which has good resistance to chemical corrosion. Since the liquid enters the vacuum pump, it will damage the equipment, so the user should pay special attention to the protection against back suction.

Common anti-suck-back protection is divided into two ways: one is to add a buffer bottle between the vacuum pump and the filter bottle. For example, you can use the anti-suck buffer bottle to recover the sucked liquid. If you accidentally suck the liquid directly into the vacuum pump, operate it as follows: If you suck in a small amount of liquid, do not shut down the vacuum pump immediately after use.

All motors of Hawach diaphragm vacuum pumps are provided by a professional motor export manufacturer, which keeps the pumps in good condition for a long time. With the surface treated with safe chemical resistance, you can find a gas-built-in filter material that ensures the purity of the air output. It’s easy to move, easy to operate, with the result of high wind speed, and a perfect vacuum. And Hawach diaphragm vacuum pumps also have designed of adjustable pressure which can provide certain vacuum and gas velocity ranges to meet your needs when putting vacuum filtration into practice.