JPH0817963B2 - Cleaning device for dehydrated cake in cone-type continuous centrifuge - Google Patents

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention improves the washing effect of a dehydrated cake in a cone-type continuous centrifuge used for solid-liquid separation treatment in the chemical industry, pharmaceutical industry, and food industry.
The present invention relates to a dehydrated cake cleaning device designed to improve quality.

[0002]

2. Description of the Related Art Conventionally, cake washing in a cone type continuous centrifuge is performed by injecting a washing liquid flowing out from a washing pipe port of a washing pipe into a cone-shaped frame in a screw to form a plurality of pieces provided on a slope of the cone type screw. The cleaning cake is discharged from the cleaning hole and is sprinkled on the dehydrated cake that is continuously conveyed from the small diameter portion to the large diameter portion of the basket on the inner peripheral surface of the screen mounted on the inner surface of the cone-shaped basket.

[0003]

According to this method, the width of the cleaning water discharged from the plurality of cleaning holes is narrow and not uniform, and the dehydrated cake is continuous from the small diameter portion to the large diameter portion of the basket. As it is transported, it passes through instantly. Therefore, there is a drawback that the cleaning liquid is very small and the cleaning effect on the dehydrated cake is very low, and sufficient cake cleaning cannot be obtained.

An object of the present invention is to effectively wash a dehydrated cake and to enhance the washing effect on the dehydrated cake to improve the quality of the dehydrated cake.

[0005]

The present invention has been made to achieve the above-mentioned object, and a filtration screen is attached to the inner peripheral surface of a cone type basket of a cone type continuous centrifuge, and A screw with an opening for passing the cleaning liquid is arranged on the inside of the screw, a water tank with a partition plate divided into a receiving tank and an overflow tank is fixed inside the screw, and a cleaning water screen is installed between the water tank and the screw. , The cleaning liquid flowing out from the cleaning pipe port is introduced into the receiving tank of the water tank, the lower part of the partition plate provided in the water tank is dipped into the overflow tank, and overflows from each edge of the weir plate in the axial direction of the overflow tank. The gist of the present invention is to effectively wash the dehydrated cake by spraying the cleaning liquid on the dehydrated cake that has been passed through the cleaning water screen and the opening of the screw and is conveyed on the inner peripheral surface of the filtration screen.

[0006]

The cleaning liquid flowing out from the cleaning pipe port is introduced into the receiving tank of the water tank, and centrifugal force is applied by the rotation of the water tank. This cleaning liquid that has entered the receiving tank dives under the partition plate provided in the water tank and flows into the overflow tank, and centrifugal force is applied until it begins to overflow from each edge of the weir plate in the axial direction of the overflow tank. Therefore, when the cleaning liquid overflows from each edge of the weir plate in the axial direction of the overflow tank, it has a large velocity energy due to the centrifugal force and is radially separated from each edge. The cleaning liquid passes while being dispersed by a cleaning water screen, and further passes through the opening of the screw cylinder. Then, the dewatering cake surface conveyed in the large diameter direction of the basket on the inner peripheral surface of the cone type basket is sprayed extensively with this cleaning liquid and strongly washed, so that the cleaning effect is high and good cake cleaning is performed. be able to.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below based on the embodiments shown in the drawings. In the figure, reference numeral 1 designates a basket, which has a predetermined cone shape in accordance with the continuous centrifugal separation capacity and has a required inclination angle with respect to the horizontal axis of the separator. Is provided in the separator body so as to rotate at high speed, and a screw 2 is provided in the basket 1. The screw 2 rotates slightly faster than the basket 1, and the dehydrated cake separated and attached on the inner surface of the filtration screen 11 mounted on the inner peripheral surface of the basket 1 is removed by the cake discharge cover 1
It is designed to be conveyed inward. A liquid supply pipe 3 is arranged so that the slurry is supplied from the outside to the inner end portion of the center of the screw 2. The slurry supplied from the liquid supply pipe 3 is guided to the inner peripheral surface of the basket 1 from the slurry supply port at the inner rear end of the screw 2, and is conveyed along the inner peripheral surface of the basket 1 from the inner end to the outer end. When this is done, the desired separation dehydration is carried out.

An open portion is provided in the body of the screw 2, and a cylindrical washing water screen 10 is mounted inside. The screen 10 is detachable, and a wash water passage hole is formed in the width of the open portion of the body of the screw 2. This washing water passage hole is selected and attached so that the length of the opening of the body of the screw 2 required for the width of the opening portion, the size of the hole, the position, and the like, which are suitable for the cake washing effect, are selected and installed. I am trying.

Further, a water tank 7 having a partition plate 8 which is divided into a receiving tank 71 and a plurality of overflow tanks 72 is fixed to the screw 2 inside thereof, and rotates integrally with the screw 2.
The cleaning liquid flowing out from the cleaning pipe port of the cleaning pipe 13 provided on the side of the liquid supply pipe 3 is introduced into the receiving tank 71 of the water tank 7, and at the same time, a hole or a gap in the lower part of the partition plate 8 provided in the water tank 7 while centrifugal force is applied. 8h is dipped into the overflow tank 72 and accumulated to the inner diameter D1 of each edge of the weir plate 9 in the axial direction of the overflow tank L,
It has a centrifugal force from the width of the gap and overflows uniformly.
Further, the length L of each edge inner diameter D1 of the dam plate 9 in the axial direction of the overflow tank 72 may be a sawtooth shape in addition to the linear shape. The relationship between the inner diameter D1 of the barrier plate 9, the inner diameter D2 of the partition plate 8 and the inner diameter D3 of the outer wall 73 of the water tank 7 is set to D1>D2> D3, whereby the inner peripheral edge of D3 overflows and the cake outlet side. Prevents the inflow of cleaning liquid into.

The cleaning liquid thus separated from each edge of the weir plate 9 in the axial direction of the overflow tank 72 with the velocity energy due to the centrifugal force is dispersed by the cleaning water screen 10 provided on the outer peripheral side. The dehydrated cake that has passed through the holes of the screen 10, passed through the opening of the screw cylinder, and is conveyed on the inner peripheral surface of the filtration screen is sprayed evenly and evenly, and thus the dehydrated cake is washed strongly.

On the outer surface of the screen retainer 4 provided at the outer end portion of the basket 1, there is provided a conical ball 5 having an inclined surface having an inner peripheral surface having a small diameter on the outer end side. An auxiliary blade 6 having a tapered blade shape is provided at the outer end of the screw 2 together with the conical tapered surface. Thus, the dehydrated cake separated and dehydrated in the cone-shaped basket 1 is subjected to effective cake cleaning as described above, and the dehydrated cake of excellent quality is scraped out by the outer blades of the screw 2, that is, the auxiliary blades 6, to form a conical ball. The cake is discharged into the cake discharge cover 12 from the outer edge of No. 5.

[0012]

In the cone-type continuous centrifuge equipped with the cleaning apparatus of the present invention, the cleaning liquid is evenly sprayed on the entire surface or a necessary portion of the dehydrated cake conveyed in the cone-shaped basket. In addition, since the dehydrated cake is strongly washed with the cleaning liquid having the velocity energy due to the centrifugal force, there is an advantage that the cake cleaning effect can be greatly improved and a dehydrated cake of excellent quality can be obtained.

[Brief description of drawings]

FIG. 1 is a partially broken external view of a cone-type continuous centrifuge body.

FIG. 2 is a cross-sectional explanatory view of a basket portion.

FIG. 3 is an outer side view of the basket portion.

FIG. 4 is a cross-sectional view of the overflow tank of the water tank as viewed from the right side surface.

[Explanation of symbols]

 1 Basket 2 Screw 3 Liquid Supply Pipe 4 Screen Presser 5 Conical Ball 6 Auxiliary Blade 7 Water Tank 8 Partition Plate 9 Overflow Tank Axial Dam Plate 10 Cleaning Water Screen 11 Filtration Screen 12 Cake Discharge Cover 13 Cleaning Pipe L Water Tank Length of the weir plate in the axial direction of the overflow tank D1 Inner diameter of the liquid surface of the washing water in the water tank D2 Inner diameter of the partition plate D3 Inner diameter of the outer wall of the water tank

Claims (1)

[Claims] 1. In a continuous centrifuge having a cone-shaped basket, a filtration screen is mounted on the inner peripheral surface of the cone-shaped basket, and a screw provided with an opening through which a washing liquid passes is arranged in the basket. In addition, fix a water tank with a partition plate that divides the water level differently between the receiving tank and the overflow tank in the screw, install a washing water screen between this water tank and the screw, and flow out from the washing pipe port. Introduce the cleaning liquid to the receiving tank of the water tank, and form holes or gaps in the partition plate to allow the lower part of the partition plate to flow into the overflow tank, and the cleaning liquid overflowing from each edge of the weir plate in the axial direction of the overflow tank. In a cone-type continuous centrifuge characterized in that the dehydrated cake is washed by passing it through the washing water screen and the opening of the screw and spraying it on the inner peripheral surface of the filtering screen. Cleaning device for dehydrated cake.