Vacuum negative pressure filtration device is one of the effective filtration equipment applied to machine tool coolant filtration. Generally, recyclable filter belt disposable filter paper is used, the filtering accuracy is 5-15 μ M. The filtration accuracy of stainless steel wedge screen is about 50-80 μ M. The flow rate is generally more than 2000 L / min, which is suitable for centralized filtration of several kinds of machine tool coolant. The centralized filtering system generally adopts vacuum negative pressure filtering device, which is combined with water pump liquid supply system, pipeline system, emulsion distribution system electric control system.
The liquid is forced to penetrate the filter layer by pump suction, the dirty liquid enters the dirty liquid tank with mesh plate at the bottom, there is a vacuum chamber under the dirty liquid tank. A recyclable filter belt disposable filter paper is laid between the dirty liquid tank the vacuum chamber to filter solid particles. The centrifugal pump draws liquid the vacuum chamber for the use of machine tools, which can provide filtration liquid supply functions at the same time. Compared with the gravity tape filter, the smoke can produce higher pressure make the liquid permeate the filter medium. In contrast, the liquid flow rate of vacuum negative pressure paper tape filter with the same flow rate can reach 4-6 times of that of gravity paper tape filter, which has the advantage of saving a lot of space.
The vacuum negative pressure filter has the following four advantages in use
1. Using atmospheric pressure to force the liquid to pass through the filter layer, the dirty liquid enters the dirty liquid tank with mesh plate at the bottom, the vacuum chamber is under the dirty liquid tank. A recyclable filter belt disposable filter paper is laid between the dirty liquid tank the vacuum chamber to filter solid particles. The centrifugal pump pumps out liquid the vacuum chamber for machine tools. Vacuum negative pressure filtration device can provide filtration liquid supply functions at the same time.
2. The accumulation of porous filter cake on the filter media is helpful to enhance the ability of collecting particles improve the filtration efficiency. With the increase of impurities in the filter medium, the passing velocity of the liquid decreases the vacuum degree in the vacuum chamber changes. When the true space changes to the preset value, PLC control will automatically start the regeneration cycle. In this process, the water supply of the pump is affected, the new filter medium is input by the conveyor belt, the dirty filter medium is discharged. Due to the short cycle time of each renewal, only a small piece of filter media is discharged, a large number of filter cakes which can enhance the filtering effect are retained, which can continuously ensure the filtering quality. The seal between the dirty liquid tank the vacuum chamber is a simple reliable hydraulic seal without maintenance.
3. The transmission mechanism is only used to transport the used filter media impurities. The robust design can meet the heavy load transmission save the liquid consumption, because the filter medium regeneration travel time is short, the liquid can have enough time to return. The characteristics of solid impurities, permeability, liquid cleanliness cost considerations are very important for the selection of vacuum negative pressure filter gravity paper tape filter.
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