JPS598756Y2 - Cone type continuous centrifuge - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a cone-type continuous centrifuge.

In recent years, continuous filtration separators have been widely used to save labor in solid-liquid separation processes in various industries.

However, the ability of this separator to separate depends on the particle size of the processed material, and even if separation is possible, the moisture content of the cake and the cake washing effect are inferior to the separation performance of conventional vertical centrifuges.

In addition, for example, when separating and dewatering a slurry in which the majority of large particles (100μ or more) and the rest are small particles (100μ or less) mixed in, most of the separation and dewatering is performed in the dehydration zone, and the dewatered cake is It is conveyed and discharged by a screw.

Since the residence time of the cake is about 1 second, large particles are well dehydrated and dusted, but small particles are not sufficiently separated.

This is because the dehydrated cake becomes sticky and lump-like when mixed with liquid shibuki.

Furthermore, if there are many fine particles (or if the particle size is large), the screen will become clogged.

As a countermeasure, if you wash the cake with water from the washing section,
The screen is washed and can be dehydrated.

However, if the amount of washing is large, the water will run over the screen surface and the moisture content of the entire cake will deteriorate.

Note that even after washing with water, the fine particles do not lose their sticky state.

Furthermore, the cake washing effect has the disadvantage that it is difficult to obtain good results because the amount of water washed and the residence time are limited, and the range of application is therefore limited.

In view of this, the present invention was devised to dehydrate and separate fine particles without making them sticky, and will be explained below with reference to the illustrated embodiments.

In the figure, 1 is a cone-shaped basket whose size is predetermined according to the continuous centrifugation capacity, and the outer peripheral surface of the basket is inclined at an angle of about 20° with respect to the horizontal axis of the separator. The basket 1 is provided with a corner on the main body of the separator so as to rotate at high speed, and a screw 2 is provided within the basket 1.

The screw 2 rotates slightly faster than the basket 1, and discharges the solid matter separated and attached to the screen surface attached to the inner peripheral surface of the basket toward the discharge port.

In addition, a liquid supply pipe 3 is arranged at the inner end of the center of the screw 2 so that slurry etc. can be supplied from the outside. When the basket 1 is guided to the peripheral surface and conveyed from the inner end to the outer end along the inner peripheral surface of the basket, the desired separation and dehydration is performed.
As shown in FIG. 2, it is divided into a dewatering zone A and a washing zone B from its inner end to its outer end.

Further, on the outer surface of the screen presser 4 provided at the outer end of the basket 1, the inner peripheral surface has a slightly inclined surface with a smaller diameter on the outer end side, for example, a conical taper surface 5a of about 5 degrees. In addition to providing a conical ball 5 with a tapered shape, an auxiliary blade 6 whose blade shape is tapered is provided at the outer end of the screw in conjunction with the conical tapered surface of the conical ball. In other words, a draining hole h is bored near the position where the screen holder is installed.

When the cake dehydrated in the cone-shaped basket, the liquid adhering to it together with fine particles, and the liquid that ran on the mating surface of the screen (without dehydration holes) are conveyed to the largest diameter part of the cone-shaped basket, the decanter These cakes and shibuki liquid temporarily remain in the conical ball part of the mold.

It is scraped out by the auxiliary blade 6', but at this time, the shibuki liquid returns to the large diameter side and escapes from the liquid removal hole h, contrary to the removal of the cake.

Therefore, it is possible to always discharge the cake in a stable state without forming a lump-like shape from the above-described separation operation.

According to the present invention, a conical ball whose inner peripheral surface is a conically tapered surface is provided at the outer end of the basket, and auxiliary blades are provided at the outer end of the screw in accordance with the inner peripheral surface of the conical ball, and furthermore, at the outer end of the basket. Since deliquing holes are drilled in the filter, even fine particles can be reliably separated and dehydrated, and a large amount of water can be added, making it easier to remove clogged screens and improving the cake cleaning effect. It has the following.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway external view of a cone-type continuous centrifuge, and FIG. 2 is an enlarged explanatory view of the main parts. 1...Basket, 2...Screw, 3...Liquid supply pipe, 4...Screen holder, 5...Conical ball, 5a・・・・・・
Conical tapered surface, 6... Auxiliary blade, A...
・Dehydration zone, B...Washing zone, h...
...Drainage hole.

Claims (1)

[Scope of utility model registration request] A draining hole is bored at the outer end of the cone-shaped basket, and a screen holder is integrally provided at the outer end of the basket,
A conical ball is integrally provided on the outer surface of the screen holder, the inner circumferential surface of which has a conical taper surface whose diameter becomes smaller toward the outside.
and a cone-type continuous centrifugal separator, wherein the outer end of the screw disposed in the basket is provided with auxiliary blades shaped to follow the conical tapered surface of the conical ball.