Operational principle
The rotating axes system of this machine consists of outer shaft system and inner shaft system, and both of the two shaft systems rotate synchronistically. While rotating synchronistically with the outer shaft system, the inner shaft system can also move a distance of a drum along the axial direction. The outer shaft system is connected to the drum without filtration pore and its axial direction is fixed; the hollow filtration laminas are scattered uniformly in the annular area close to the inner wall of the drum, spokewise, and it is connected to the inner shaft system which can move in the axial direction via the fore and back baffles, on the surface of the filtration laminas is enwrapped the filtration medium. During filtration separation, different from the traditional filtration series centrifugal machine, the liquid phase of this machine doesn’t need to penetrate the solid filter cake in the radial direction, but penetrates the built-in filtration medium in the filter cake layers along the closest path with the minimal filtration resistance under the action of centrifugal force into the hollow filtration laminas and is led to liquor drainage holes at the bottom circumference of drum to vent out, the solid phase is held back by the filtration lamina at the fan-shaped area between the filtration laminas ( refer to figure 1 and 2) to form filter cake. When unloading, the rotate speed of the rotating axes system is reduced to the specified lower rotate speed, the inner shaft system pushes forward in the axial direction while synchronistically rotating, making the filter cakes scattered in each fan-shaped area expel from drum (refer to fig. 3). Then the inner shaft system retracts along the axial direction and is fastened tightly, and enters the next circle after raising speed.

Operational principle

The whole route consists of: feeding, filtration separation, washing, liquid excluding, speeding down, unloading, raising speed etc. operational processes. According to the condition of service, the operational control can be selected between manual and automatic control modes.

Typical technological process

Range of application
TN Series Auto In-Pass Fillter Centrifugal Machine is a kind of filter centrifugal machine which should be operated intermittently. Generally speaking, it can separate suspended liquid with solid particle between 5um and 2mm. When the content of solid phase (weight ratio) is from 2% to 50%, the recovery efficiency should be more than 99%.
It especially applies to solidliquid separation process for poisonous, explosive and excitant material or material hard to separate with thixotropy.

Performance and characteristics
1. High filtration efficiency .While filtration separation, the filtration laminas scattered spokewisely can expel from the drum, realizing the filtration with no filter cake and thin filter cake at low filtration resistance. Its filtration area is larger than the cylindrical filtration area of traditional centrifugal machine. So its indexes such as filtration efficiency, content of wet filter cake etc, obviously excels those of the traditional centrifugal machine with cylindrical filtration area.
2. The filter cake can be pushed forward automatically at low speed, and there is no mechanical components scraping the solid phase during unloading, so the crystal grain and purity of the solid phase are protected very well.
3. During unloading, the direction of the centrifugal force thrown on the filter cake is parallel to the surface of the filtration medium, so the filter cake has the trend of leaving the filtration laminas, and the filter cakes are scatted in fan shape between the filtration laminas, so the filter cakes can be unloaded completely, with no material deposit and no residue filter cake layers on the filtration medium. The filtration medium can be reused easily and has long service life.
4. The airtight operation of the overall process and the automatic control can be realized. According to the concrete technics and material characteristics, the operational parameters can be specified at one shot, that is to say that the exchange and control of each operational process can be automatically realized by PLC programmable controller (such as feeding, filtration, washing, liquid excluding, unloading etc), and the manual control operation can also be selected if necessary.
5. Characteristics of high filtration efficiency, short assistant work time and able to be operated with no worker. At the same time, realizing the airtight automatic operation, and the work environment and operational conditions being improved ultimately, and the labor cost is greatly reduced.
6. Relative to the inverting filter centrifugal machine with the similar function, because this machine can be unloaded without the filter bag being overturned repeatedly, so the life of the filtration medium can be obviously enhanced, and the axial distance moved during unloading is a width of a drum, that is only half of the distance which the inverting filter centrifugal machine moves in axial direction, so the length of the overall machine is decreased by width of two drums, and the floor space of this machine is greatly reduced compared with the inverting filter centrifugal machine.

Main technical parameters