JP3387905B2 - Cone centrifuge basket - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cone-type continuous centrifuge basket used for solid-liquid separation in the chemical industry, pharmaceutical industry, food industry, etc. Cone-type continuous centrifugation capable of preventing solid particulates from accumulating on the cross section of the basket of a cone-type centrifuge in which a screen is arranged on the inner peripheral surface so as to connect to each other to form a slit It is about the basket of machines.

[0002]

2. Description of the Related Art In the chemical industry, pharmaceutical industry, food industry, etc., a cone type continuous centrifuge has been widely used for the separation treatment of solid-liquid.

In this cone type centrifuge, as shown in FIG. 6, a slit 1 is formed by connecting a number of ring-shaped parts with crosspieces 9.
A bottomed conical basket 1 to form 2
And a screen 2 arranged on the inner peripheral surface of the basket 1.
And the screw blade 32 on the outer peripheral surface disposed inside thereof.
A screw 3 having a conical shape and a slurry supply pipe 4 which is arranged so as to be substantially aligned with the central axis of the basket 1 and which opens toward the bottom of the basket 1; and a slurry supplied from the slurry supply pipe 4. A distributor 5 extending to the screw 3 for guiding the inner peripheral surface of the basket 1, that is, a space formed between the screen 2 and the screw 3, and a cleaning liquid supply pipe 6 for supplying the cleaning liquid to the inner peripheral surface of the screw 3. It consists of and.

In this cone type centrifuge, the basket 1 and the screw 3 are attached to the respective rotating shafts 11,
The slurry is rotated through 31 at a required rotation speed (in this case, the rotation speed of the screw 3 is usually set slightly higher than the rotation speed of the basket 1) by an electric motor (not shown). The slurry is supplied from the slurry supply pipe 4 through the distributor 5 to the inner peripheral surface of the basket 1, that is, the space formed between the screen 2 and the screw 3. As a result, the slurry supplied to the space formed between the screen 2 and the screw 3 has a liquid component passing through the screen 2 having innumerable fine holes due to centrifugal force, and is then formed in the basket 1. It is discharged into the separated liquid tank 7 through the slit 12. On the other hand, the solid component captured by the screen 2 is
By the action of the screw blades 32 of the screw 3 that rotates with a slight difference from the basket 1, the screw 3 is transferred toward the open end of the basket 1 and becomes a dehydrated cake and is discharged into the dehydrated cake discharge duct 8.

[0005]

By the way, as shown in FIG. 6, the basket 1 of this cone-type centrifuge has the following structure.
The cross section 9 is generally formed of a rib protruding from the outer peripheral surface of the basket 1, and the cross section 9 is formed of a non-formation portion of the slit 12 formed in the basket 1 as shown in FIG.

Of these, the one shown in FIG. 6 in which the crosspiece 9 is a rib protruding from the outer peripheral surface of the basket 1 is
A bottomed conical basket material provided with ribs that form the cross section 9 is created by casting or the like, and then penetrates from the inner peripheral surface side to the outer peripheral surface side of the basket material (however, the rib that forms the cross section 9 ( (A part of) is left.) The ring-shaped slit 12 is formed by cutting over the entire circumference to be manufactured.

By the way, if the ring-shaped slit 12 is formed by cutting along the entire circumference in this way, as shown in FIG.
As shown in (C), the rib screen 2 that becomes the cross section 9
The surface 91 opposed to is also similarly cut and formed into a curved surface having a depressed center.

On the other hand, the crosspiece 9 shown in FIG.
The non-formed portion of the slit 12 formed in the first step is made by first casting a bottomed cone-shaped basket material, and then the ring-shaped slit 12 penetrating from the inner peripheral surface side to the outer peripheral surface side of the basket material. Are formed by cutting while forming the non-formed portions of the slits 12 at substantially equal intervals.

By the way, if the ring-shaped slits 12 are formed by cutting while forming the non-formed portions of the slits 12 at substantially equal intervals, as shown in FIG. 8C, as in the above case. As shown, the slit 1 that becomes the crosspiece 9
The surface 91 of the second non-formation portion facing the screen 2 is also formed into a curved surface with a depressed center.

Then, ribs and slits 12 which become the crosspieces 9 are formed.
When the screen 2 is disposed on the inner peripheral surface of the basket 1 whose surface 91 facing the screen 2 of the non-forming part is formed in a curved surface having a depressed center, and solid-liquid separation treatment is performed, In the case where the particles have viscoelasticity such as synthetic resin powder (for example, polycarbonate), a small amount of solid fine particles that have escaped through the screen 2 and the rib screen 2 that serves as the cross section 9 of the basket 1. It is gradually deposited on the facing surface 91. In this state, if the solid-liquid separation process is continued as it is without disassembling and cleaning the basket 1 and the screen 2, the solid fine particles deposited on the surface 91 of the rib that will be the crosspiece 9 of the basket 1 facing the screen 2 will be removed. New solid particles are further deposited on the screen, and the screen 2 made of a thin plate is lifted due to the deposited solid particles, and the screen 2 is deformed, and the screw blade 32 of the screw 3 is attached to the deformed screen 2. Had a problem that the screen 2 and the screw blade 32 were damaged. In addition, in order to prevent the screw blade 32 of the screw 3 from coming into contact with the screen 2, it is conceivable to set the interval between the screen 2 and the screw blade 32 of the screw 3 larger than usual (about 1 mm), This way,
There is a problem that the thickness of the cake on the screen 2 is increased and the solid-liquid separation efficiency is reduced (the water content of the dehydrated cake is increased).

In view of the problems of the above-mentioned conventional cone type centrifuge, the present invention has a screen disposed on the inner peripheral surface in which a large number of ring-shaped portions are connected by crosspieces to form slits. The cone-type centrifuge basket that prevents solid particles from accumulating on the cross section of the cone-type centrifuge basket and prevents the screen from deforming or the screw blades of the screw coming into contact with the screen. The purpose is to provide.

[0012]

In order to achieve the above object, the basket of the cone type centrifuge of the first aspect of the present invention comprises:
In a basket of a cone-type centrifuge in which a screen is arranged on an inner peripheral surface in which a number of ring-shaped parts are connected by a crosspiece to form a slit, the surface of the crosspiece that faces the screen is projected. It is characterized in that it is formed on both inclined surfaces.

In order to achieve the same object, the basket of the cone type centrifuge of the second aspect of the present invention has a screen on the inner peripheral surface of which a large number of ring-shaped portions are connected by crosspieces to form slits. In the basket of the cone-type centrifuge in which is provided, the surface of the crosspiece facing the screen is formed as a convex one-sided surface.

Further, in the construction of the basket of the cone type centrifuge of the first and second inventions described above, the basket of the type in which the cross section is a rib projecting from the outer peripheral surface of the basket and the slit formed in the basket are formed. The present invention can be applied to any of the baskets having a non-forming part.

In the basket of the cone type centrifuge of the first and second aspects of the present invention, the surface of the crosspiece connecting the ring-shaped portions, which faces the screen, is formed as a convex double inclined surface or a convex single inclined surface. Therefore, even if the solid particles to be subjected to the solid-liquid separation treatment are those having viscoelasticity such as synthetic resin, the solid fine particles that have passed through the screen are not exposed on the surface of the cross section of the basket facing the screen. Without depositing, it flows out from the basket together with the liquid component and is discharged into the separated liquid tank.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of a basket of a cone type centrifuge of the present invention will be described below with reference to the drawings.

1 to 5 show an embodiment of a cone type centrifugal separator to which the present invention is applied. The basic structure of this cone-type centrifuge is the same as that of the conventional cone-type centrifuge, and a basket with a bottomed cone shape in which a large number of ring-shaped parts are connected by crosspieces to form slits. 1 and the inner peripheral surface of the basket 1, both ends of which are fixed members 13, 1
4, a screen 2 fixed to the basket 1 by means of 4, a conical screw 3 having screw blades 32 on the outer peripheral surface disposed therein, and a screen 2 disposed so as to substantially coincide with the central axis of the basket 1. In order to guide the slurry supply pipe 4 that opens toward the bottom of the basket 1 and the slurry supplied from the slurry supply pipe 4 to the inner peripheral surface of the basket 1, that is, the space formed between the screen 2 and the screw 3. It is composed of a distributor 5 extended to the screw 3 and a cleaning liquid supply pipe (not shown) which can be arranged as needed and supplies a cleaning liquid to the inner peripheral surface of the screw 3. In addition, on the screen 2,
In addition to the one integrally molded in advance according to the shape of the inner peripheral surface of the basket 1, those arranged along the inner peripheral surface of the basket 1 and attached by abutting the edges thereof can be used. 2 itself has high strength,
It is desirable to use one that is integrally formed in advance in conformity with the shape of the inner peripheral surface of the basket 1, which is difficult to deform.

In this cone type centrifuge, the basket 1 and the screw 3 are attached to the respective rotating shafts 11,
The slurry is rotated through 31 at a required rotation speed (in this case, the rotation speed of the screw 3 is usually set slightly higher than the rotation speed of the basket 1) by an electric motor (not shown). The slurry is supplied from the slurry supply pipe 4 through the distributor 5 and the slurry discharge port 33 to the inner peripheral surface of the basket 1, that is, the space formed between the screen 2 and the screw 3. As a result, the slurry supplied to the space formed between the screen 2 and the screw 3 has a liquid component passing through the screen 2 having innumerable fine holes due to centrifugal force, and is then formed in the basket 1. It is discharged into the separated liquid tank 7 through the slit 12. On the other hand, the solid components captured by the screen 2 are transferred toward the open end of the basket 1 by the action of the screw blades 32 of the screw 3 that rotates with a slight difference from the basket 1 to form a dehydrated cake, and the dehydrated cake is discharged. It is discharged into the duct 8.

In this case, the basket 1 of the cone-type centrifuge is not particularly limited, but a basket whose rib 9 projects from the outer peripheral surface of the basket 1 is used.

In the bucket having ribs projecting from the outer peripheral surface of the basket 1, the crosspiece 9 is first formed by casting a bottomed conical basket material having ribs to be the crosspiece 9 by a method similar to the conventional method. Then, the basket material is pierced from the inner peripheral surface side to the outer peripheral surface side (however, (a part of the rib which becomes the crosspiece 9 is left).
It is manufactured by forming the ring-shaped slit 12 by cutting over the entire circumference. In this state, in FIG.
As shown in (C), the rib screen 2 that becomes the cross section 9
The surface 91 opposed to is also similarly cut and formed into a curved surface having a depressed center.

In view of this, in this embodiment, the surface 91 of the crosspiece 9 of the basket 1 facing the screen 2 is post-processed, so that both convex sloped surfaces (substantially, as shown in FIG. 5A). It is formed to have a V-shape), or as shown in FIG.
Thereby, the solid particles to be subjected to the solid-liquid separation treatment,
Even in the case of a viscoelastic material such as a synthetic resin, the solid fine particles that have passed through the screen 2 are allowed to flow out of the basket 1 together with the liquid component without being deposited on the surface 91 of the crosspiece 9 of the basket 1 facing the screen 2 and separated. It can be discharged into the liquid tank 7.

By the way, as shown in FIG. 5B, the surface 91 of the crosspiece 9 of the basket 1 facing the screen 2 is
In the case of forming the convex one-sided inclined surface, it is desirable that the basket 1 is formed so as to be convex on the rotational direction side. As a result, the solid fine particles that have passed through the screen 2 can be more smoothly discharged from the basket 1 together with the liquid component without accumulating on the surface 91 of the crosspiece 9 of the basket 1 facing the screen 2.

The post-processing of the surface 91 of the crosspiece 9 of the basket 1 facing the screen 2 is performed in the present embodiment.
I tried to do it manually with a grinder on hand,
The present invention is not limited to this, and may be automated by machining.

Although the basket of the cone-type centrifuge of the present invention has been described above based on its embodiment, the present invention is not limited to the structure described in the above embodiment, and for example, the basket 1 Screen 2 of cross section 9
When the surface 91 facing the
In addition, the basket of the cone type centrifuge of the present invention can be formed into a substantially U shape or a polygonal shape as shown in FIG.
As shown in FIG. 8, a basket of the type in which the crosspiece 9 is formed of a non-formed portion of the slit 12 formed in the basket 1 (in this embodiment, it faces a screen (not shown) of the crosspiece 9 of the basket 1). The surface 91 is post-processed so as to be formed into both convex inclined surfaces (substantially V-shaped) as shown in FIG. 8B. (A modification of the shape of the surface 91 of the portion 9 facing the screen is included.) And the operation are the same as those of the embodiment shown in FIGS. 1 to 5.), and a crosspiece member and a ring, each of which is a separate member. The configuration can be appropriately changed within a range not departing from the gist thereof, such as being applied to a basket or the like that is integrated with welding the shaped portions.

[0025]

According to the basket of the cone type centrifuge of the first and second aspects of the present invention, the surface of the crosspiece connecting the ring-shaped portions, which faces the screen, is a convex double inclined surface or a convex single inclined surface. Since it is formed on the surface, even if the solid particles to be subjected to the solid-liquid separation treatment are those having viscoelasticity such as synthetic resin, the solid fine particles that have passed through the screen are used as the screen of the cross section of the basket. It is possible to allow the liquid component to flow out from the basket without being deposited on the facing surface and discharge it into the separation liquid tank. This prevents solid particles from accumulating and growing on the cross section of the basket, prevents the screen from being deformed, and prevents the screw blades of the screw from coming into contact with the screen. It is possible to obtain a cone-type centrifuge that can perform the separation treatment continuously and can efficiently perform the solid-liquid separation treatment.

The basket of the cone-type centrifuge of the first and second aspects of the present invention comprises a basket of a type in which the cross section is a rib projecting from the outer peripheral surface of the basket and a slit formed in the basket. It can be applied to any of the baskets of the non-forming part type.

[Brief description of drawings]

FIG. 1 is a side cross-sectional view showing an entire embodiment of a cone type centrifugal separator to which the present invention is applied (a screen and a cleaning liquid supply pipe are omitted for description).

FIG. 2 is a front view of a half-cut sheet showing the basket.

FIG. 3 is a partially sectional side view showing the basket.

FIG. 4 shows a main part of the basket, (A) of FIG.
FIG. 4B is an enlarged view of part B, and FIG.

FIG. 5 is a sectional view taken along the line CC of FIG. 4A, in which FIG.
(B) is an enlarged cross-sectional view showing a cross section of a basket to which the present second invention is applied, and (C) is an enlarged cross-sectional view showing a cross section of a conventional basket corresponding to (A) and (B).

FIG. 6 is a side sectional view showing an entire conventional cone type centrifugal separator.

FIG. 7 shows a basket of another embodiment of a cone type centrifuge to which the present invention is applied, (A) is a half-cut front view, and (B) is a basket.
Is a side view (DD line diagram of (A)) with a partial cross section.

FIG. 8 shows an essential part of the basket, FIG.
(B) is an enlarged view of part E, (B) is an FF diagram of (A), and is an enlarged cross-sectional view showing the cross section of the basket to which the first invention is applied, (C) is shown in (B). It is an expanded sectional view which shows the crosspiece part of the corresponding conventional basket.

FIG. 9 shows a basket of another conventional cone-type centrifuge, in which (A) is a front view and (B) is a side sectional view.

[Explanation of symbols]

1 basket 10 Ring-shaped part 11 rotation axis 12 slits 2 screen 3 screws 31 rotation axis 32 screw blades 33 Slurry outlet 4 Slurry supply pipe 5 distributors 7 Separation liquid tank 8 Dewatering cake discharge duct 9 cross section 91 Surface of the crosspiece facing the screen

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Claims (4)

(57) [Claims] 1. A basket of a cone-type centrifuge in which a screen is arranged on an inner peripheral surface of a plurality of ring-shaped portions connected by a crosspiece to form a slit, and the basket is opposed to the screen of the crosspiece. A basket for a cone-type centrifuge, characterized in that the surface to be formed is formed into both convex and inclined surfaces. 2. A basket of a cone-type centrifuge in which a screen is arranged on an inner peripheral surface in which a large number of ring-shaped parts are connected by a crosspiece to form a slit, and the basket is opposed to the screen of the crosspiece. The basket of the cone-type centrifuge characterized in that the surface to be formed is formed as a convex one-sided inclined surface. 3. The basket of the cone type centrifuge according to claim 1, wherein the crosspiece is formed of a rib protruding from the outer peripheral surface of the basket. 4. The basket of the cone type centrifuge according to claim 1 or 2, wherein the crosspiece comprises a non-slit portion formed in the basket.