JPS632108Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a cone-type continuous centrifuge.

BACKGROUND ART In recent years, continuous separators such as the one shown in Japanese Patent Publication No. 18974/1983 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 containing mostly large particles (100μ or more) and the rest small particles (100μ or less), most of the separation and dewatering is performed in the dewatering zone, and the dehydrated cake is separated from the screw. It is transported and discharged by. The residence time of the cake is about 1 second, so large particles are well dehydrated, but small particles are not separated enough, and the dehydrated cake becomes sticky and lump-like due to this poorly dehydrated cake. . Also, if there are many fine particles, the screen will become clogged. As a countermeasure, if you wash the screen with water from the cake washing section, the screen will be 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. Furthermore, even after washing with water, the sticky state of the particles does not disappear.

Furthermore, since the cake washing effect is limited in the amount of water washed and the cake residence time, it is difficult to obtain good results, and the range of application is also limited. In order to dehydrate and separate these fine particles without making them sticky, the applicant filed an application for the invention disclosed in Utility Model Registration No. 1572298 (Utility Model No. 1572-8756).

The object of the present invention is to dehydrate and separate the above-mentioned fine particles without making them sticky, and also to improve the cleaning effect of the cake.

Solution to the Problem The present invention was made in view of the above points, and includes a screen that is aligned with the inner peripheral surface of a cone-shaped first basket, and a screen holder is integrally provided at the outer end of the basket. A conical ball whose inner peripheral surface has a conical taper surface whose diameter decreases toward the outside is integrally provided on the outer surface of the screw, and the outer end of the screw disposed in the first basket is provided with a conical ball having an inner circumferential surface having a conical taper surface whose diameter decreases toward the outside. In a cone-type continuous centrifuge equipped with auxiliary blades shaped to follow a conical tapered surface, an automatic discharge type second basket is placed on the outer end surface of the first basket, and the second basket is placed on the same axis and center as the first basket. This second
To provide a cone type continuous centrifugal separator, characterized in that a basket has an inclination angle equal to or greater than that of a first basket.

Embodiments The present invention will be described below based on embodiments shown in the drawings.

In the figure, 1 is the first basket, which has a predetermined size according to the continuous centrifugal separation capacity, is cone-shaped, and has a cone-shaped outer circumferential surface relative to the horizontal axis of the separator. is provided on the main body of the separator with an inclination angle of about 20 degrees and rotates at high speed, and a screw 2 is provided within the first basket 1. This screw 2 rotates slightly faster than the first basket 1,
The solid matter separated and adhered to the screen surface attached to the inner peripheral surface of the first bathfoot is discharged 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, and a cleaning pipe 7 is arranged along this pipe 3 or independently to supply cleaning water. and a cleaning nozzle 8 is attached to this cleaning pipe.
is provided so that the cake can be washed. Furthermore, the slurry supplied from the liquid supply pipe 3 is transferred to the first slurry supply port at the inner end of the screw.
When the water is guided to the inner peripheral surface of the first basket and conveyed from the inner end to the outer end along the inner peripheral surface of the first basket, the desired separation and dehydration is performed.
The basket 1 is divided into a dewatering zone A and a washing zone B from its inner end to its outer end. Further, at the outer end of the screen presser 4 provided at the outer end of the first basket 1, there is provided a conical ball 5 whose inner peripheral surface is a slightly inclined inclined surface with a smaller diameter on the outer end side. An auxiliary blade 6 is provided at the outer end of the screw to match the conical tapered surface of the ball, and an auxiliary blade 6 is provided at the outer end of the basket, that is, near the position where the screen holder is provided. Drill a liquid hole h.

Further, the outer peripheral surface of the conical ball 5 has an inclination angle of the same angle as the first basket or a larger angle, for example, 20 to 50 degrees, preferably about 30 degrees, and a second basket of automatic ejection type. A screen 9 is provided protruding so as to be coaxial with the first basket, and a screen 10 is also attached to the inner peripheral surface of the second basket in the same manner as the first basket. Fixed.

When the cake dehydrated in the cone-shaped first basket 1, the liquid adhering to the fine particles, and the liquid running on the mating surface of the screen are conveyed to the largest diameter part of the first basket, the conical ball part These cakes and Shibuki liquid are temporarily retained. It is scraped out with the outer blades of the screw, that is, the auxiliary blades 6, but at this time, the shibuki liquid returns to the large diameter side and escapes to the outside through the screen, contrary to the conveyance 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. At this time, large particles (more than 100 μ)
The above-mentioned conical balls are highly effective in slurries containing 80 to 90% or more of. However, in slurries where fine particles increase, for example, 50% or less of particles under 100μ, it is difficult to completely prevent liquid squirting using only the first basket with the conical ball. The cake is washed by spraying the cleaning liquid onto the cake from a provided nozzle, but the residence time of the cake after the cleaning liquid is sprayed is short in the first basket, so dehydration after cleaning is insufficient. Since the second basket of automatic discharge type is installed protrudingly, after the cake is dehydrated, separated and washed in the first basket, it is transported to the next second basket via a conical ball, and then the cake is supplied by falling to the water diameter side of the second basket. The water is then excessively dehydrated here and then discharged.
Therefore, even a slurry containing many fine particles can improve the dehydration and separation effect.

Effects of the invention In accordance with the present invention, a second basket of automatic cake discharge type is integrally provided on the outside of the tip of the first basket, which is equipped with a conical ball at the tip. Even a slurry containing many fine particles which cannot be separated and dehydrated can be reliably separated and dehydrated, and the separation and dehydration after washing the cake can be sufficiently carried out in the second basket, which has the advantage of improving the cake washing effect.

[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...First basket, 2...Screw, 3
...Liquid supply pipe, 4...Screen holder, 5...
Conical ball, 5a... Conical tapered surface, 6... Auxiliary blade, 7... Cleaning pipe, 8... Cleaning nozzle, 9
...Second basket, 10...Screen, 11
...Screen presser, AC...Dehydration zone, B...
...Washing zone, h...Draining hole.

Claims (1)

[Scope of utility model registration request] A screen is aligned with the inner circumferential surface of a cone-shaped first basket, and a screen holder is integrally provided at the outer end of the basket, and a draining hole is bored at the outer end of the first basket. A conical ball having a conical taper surface whose inner circumferential surface becomes smaller toward the outside is integrally provided on the side surface, and a conical taper of the conical ball is provided at the outer end of the screw disposed in the first basket. In a cone-type continuous centrifuge equipped with auxiliary blades shaped to follow a surface, a second basket of an automatic discharge type is aligned with the same axis as the first basket on the outer end surface of the first basket. A cone-type continuous centrifugal separator characterized in that the second basket is provided in a protruding manner and the angle of inclination of the second basket is equal to or greater than that of the first basket.