Patent Application
20050189287
1. Field of the Invention
The present invention relates to a slurry expressing and liquid displacing device, and particularly to a slurry expressing and liquid displacing device which expresses slurry and then separates out effluence and solid of the slurry through radial continuous filtration and washing for getting high purity solid.
2. Prior Art
One method that has been used for separating a mixture into solid and liquid component, is a separating apparatus which includes a filter permeable to the liquid component against which the mixture is urged to separate the liquid component. The solid component is substantially scraped from the filter wall, as for example as shown in U.S. Pat. Nos. 3,587,859, 4,491,462, 4,705,624, 6,467,305 and so on.
However, the constructions of the separating devices disclosed at above mentioned US patents have a common shortage that the transportation direction of slurry and the separated effluence of slurry are axially configured. Thus, during the course of effluence-solid separation, the slurry has to pass through a relatively long treatment path and so the operating time is relatively long. Furthermore, the slurry is transported by gravity in the above mentioned US patents, and so the transportation rate is low, which results in the low efficiency.
Accordingly, an object of the present invention is to provide a slurry expressing and liquid displacing device in which the direction of slurry treatment and the separated effluence of slurry are radially configured thereby shortening the path of displacing and so shortening the time required for operation and increasing separating efficiency through high transportation rate.
To achieve the above-mentioned object, a slurry expressing and liquid displacing device in accordance with the present invention is for expressing slurry and then separating out effluence and solid of the slurry through radial pore volume displacement of continuous filtration and washing. The slurry expressing and liquid displacing device includes a expressing mechanism, a displacing mechanism, a blender, a collecting tube, and first and second storage troughs. The expressing mechanism includes a driving motor, a transportation tube with a plurality of screens located on the periphery surface opposite to the collecting tube, which has an inlet at an end thereof near the driving motor and an outlet at the other end thereof, and a first helical transmission shaft rotatably connected with the driving motor. The first helical transmission shaft has a transportation zone at an end thereof near the inlet and a compression zone at the other end. The displacing mechanism disposed in the transportation tube includes a second helical transmission shaft rotatably connected with the first helical transmission. The second helical transmission shaft is hollow with a plurality of through holes being defined at the side surface thereof. A connecting port is formed at an end of the second helical transmission shaft. The blender is formed at the rear of the displacing mechanism and in the transportation tube corresponding to the outlet. The collecting tube is formed at the outside of the transportation tube between the compression zone and the displacing mechanism and kept properly spaced from the transportation tube for collecting effluence of slurry into the first storage trough. The first storage trough is near the compression zone and in communication with the transportation tube. The second storage trough is corresponding to the blender and in communication with the transportation tube.
Other objects, advantages and novel features of the present invention will be drawn from the following detailed embodiments of the present invention with attached drawings, in which:
Referring to
The displacing mechanism 3 is also disposed in the transportation tube 21 and includes a second helical transmission shaft 30 integrally formed with the first helical transmission shaft 22. The second helical transmission shaft 30 is hollow with a plurality of through holes 301 being disposed at the side surface thereof. Space between the through holes 301 is generally 0.5 mm. Each through hole 301 is formed with a slanting angle for facilitating the displacing liquid to flow out therethrough. A connecting port 302 is formed at an end of the second helical transmission shaft 30 for connecting with a complementary connecting port with displacing liquid such as water.
The blender 4 is disposed at the rear of the separating mechanism 3 and in the transportation tube 21 corresponding to the outlet 211 for scraping the separated solid congealing in the inner wall of the transportation tube 21 near the outlet 211 thereby collecting the solid in the second storage trough 7.
Thus, it is known from the above description that the slurry expressing and liquid displacing device 1 of the present invention is capable to express provided slurry into filtration cake through the quick and continuous helical transportation of the transportation zone A of the first helical transmission shaft 22 and through the compression zone B with gradually increased diameters of the first helical transmission shaft 22. The cake is radially pore volume displaced with external washing liquid (such as water) through the through holes 301 of the second helical transmission shaft 30 and thus the high purity solid are efficiently separated. During working in the transportation tube 21, separated the effluence of slurry into the first storage trough 6 through the screen 213 and the solid scraped from the wall of the blender 4 and collected into the second storage trough 7. Therefore, the slurry expressing and liquid displacing device of the present invention may be applied in fruit juice freeze-concentrating treatment, seawater desalting treatment, silt dehydration treatment and so on.
Referring to
It is understood that the invention may be embodied in other forms without departing from the spirit thereof. Thus, the present examples and embodiments are to be considered in all respects as illustrative and not restrictive, and the invention is not to be limited to the details given herein.
