JPH06292993A - Screw type dehydrater - Google Patents

Abstract

PURPOSE:To provide a screw type dehydrater in which a ribbon shaped screw is not shifted in the axial direction. CONSTITUTION:The material to be dehydrated (a) thrown in the annular space 3 from the throw in hole 10 provided on the base end side of the outside cylinder 2 is compressed and dehydrated and the dehydration resulting water is discharged to the outside through discharge water screens 9 and 20 of the inside and outside cylinders 1 and 2 by driving to turn the ribbon shaped screw 4 in a freely turnable state in the annular space 3 between the inside and outside cylinders 1 and 2. The dehydrated material (a) is discharged to the outside through a discharging port 11 provided on the front end side of the outside cylinder 2. A recessed part 27 is provided on an adequate position on the outer circumferential part of a ribbon shaped screw 4 and an annular projecting part 26 engaging with the recessed part 27 and by which shift of the ribbon shaped screw 4 in the axial direction is prevented is provided on the inner circumferential part of the outside cylinder 2.

Description

Detailed Description of the Invention

[0001]

The present invention relates to construction sludge, bottom sludge,
The present invention relates to a screw type dehydrator for compressing and dehydrating sludge such as sewage, night soil or pulp.

[0002]

2. Description of the Related Art Conventionally, as a dehydrator of this type, a cylindrical body having a drainage screen formed of a large number of drainage holes and screw blades with screw shafts arranged concentrically in the cylindrical body are provided. By rotationally driving the shaft, the object to be dehydrated introduced into the cylinder from the charging port provided on the base end side of the cylinder is transferred by the screw blades, and the object to be dehydrated is squeezed and dehydrated during the transfer, There is a device in which the dehydrated water is discharged to the outside from the drainage screen and the dehydrated substance to be dehydrated is discharged to the outside from a discharge port provided on the tip side of the cylindrical body.

In the above structure, since the screw blades are fixed to the screw shaft, the screw blades do not bend due to the compression reaction force and can squeeze the material to be dehydrated in a predetermined manner. There is a case where the substance to be dehydrated comes into close contact with the product to cause a so-called entrainment phenomenon, which makes it difficult to transfer the substance to be dehydrated.

Therefore, a ribbon-shaped screw is arranged in the cylinder to transfer the substance to be dehydrated.

[0005]

In the conventional dehydrator using the ribbon-shaped screw, since there is no screw shaft, it is possible to eliminate the so-called entrainment phenomenon of the object to be dehydrated, but on the other hand, the ribbon-shaped screw is used. Since there is nothing to support, the compression reaction force is concentrated on the ribbon-shaped screw, which displaces in the axial direction and bends, making it impossible to squeeze the material to be dehydrated as prescribed. In order to eliminate such difficulties, the thickness of the ribbon-shaped screw is increased to increase the rigidity to prevent it from bending, but this requires a large amount of high-quality and expensive ribbon-shaped screws. Therefore, there is a drawback that the production cost is high.

In view of the above-mentioned drawbacks, an object of the present invention is to provide a screw type dehydrator in which the ribbon-shaped screw is prevented from being displaced in the axial direction.

[0007]

In order to achieve the above object, the present invention rotatably arranges a ribbon screw in an annular space between an inner cylinder and an outer cylinder which are concentrically arranged. ,
By rotationally driving the ribbon-shaped screw, the substance to be dehydrated introduced into the annular space from the inlet provided on the base end side of the outer casing is squeezed and dehydrated, and the dehydrated water is removed from the inner and outer casings. In the dehydrator, the water is drained to the outside through a drain screen formed on one or both of the drains, and the dehydrated material to be dehydrated is discharged to the outside through an outlet provided on the tip side of the outer cylinder. A concave portion or a convex portion is provided at an appropriate position on the outer peripheral portion of the screw-shaped screw, and an annular convex portion or an annular concave portion that engages with the concave portion or the convex portion and prevents the ribbon-shaped screw from being displaced in the axial direction of the outer cylinder is formed. It is characterized in that it is provided in the inner peripheral portion.

[0008]

According to the above construction, after the substance to be dehydrated such as sludge is charged into the annular space between the inner and outer cylinders from the charging port, the screw is rotatably driven to squeeze the substance to be dehydrated. , In this case, since the concave portion or the convex portion provided on the outer peripheral portion of the ribbon screw and the annular convex portion or the annular concave portion provided on the outer cylinder are engaged with each other, the ribbon screw receives the compression reaction force. The object to be dehydrated can be surely squeezed and dehydrated without being displaced by being displaced in the axial direction and being distorted.

The water dehydrated as described above is drained to the outside through a drainage screen formed on one or both of the inner and outer cylinders, and the dehydrated substance to be dehydrated is disposed on the tip side of the outer cylinder. It is discharged from the outlet to the outside.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows a screw type dehydrator which is an embodiment of the present invention, and is rotatable in an inner cylinder 1 and an outer cylinder 2 and an annular space 3 formed between the inner and outer cylinders 1 and 2. And a ribbon-shaped screw 4 disposed on the.

[0011] the outer tube 2 is provided with a plurality of tubular bodies 2 ₁ to 2 ₅ arranged concentrically at predetermined intervals, each cylindrical member 2 ₁ to 2 _5, and between the base end side tubular member 2 ₁ a proximal end Each of the cylinders 2 arranged in the
A support member 8 in which ₁ to ₂₅ are fixed to a base 6 and a through hole 7 concentric with the cylindrical bodies 2 ₁ to ₂₅ is provided in the center thereof.
₁ to 8 ₅ and each of the cylinders 2 ₂ to 2 ₄ excluding the cylinders 2 ₁ and ₂₅ at the front and rear ends is formed with a drainage screen 9 including a large number of drainage holes 9 a. ₁ to be dehydrated a
Is formed, and a discharge port 1 for discharging the dehydrated dehydrated material a to the outside is formed at the opening of the distal end side cylinder body _25.
1 is formed. A water receiving tank (not shown) is provided below the outer cylinder 2.

The inner cylinder 1 is formed in a taper shape that spreads outward toward the front end side, and the front end of the inner cylinder 1 projects outside from the discharge port 11 and is fixed to the machine base 6 via the support frame 13a. At the same time, the base end portion is inserted through the seal material 19 into the central through hole 17 of the rotary wheel 16 that is rotatably disposed in the base end side tubular body 2 ₁ through the bearing 14 and the seal material 15. In addition, it is fixed to the base 6 via the support frame 13b, whereby the inner cylinder 1 and the outer cylinder 2 are arranged concentrically. Further, a drainage screen 20 including a large number of drainage holes 20a is formed in the central portion of the inner cylinder 4 excluding both ends.

The tip end of the ribbon screw 4 extends to the vicinity of the discharge port 11, and the base end thereof is fixed to the rotary wheel 16, and the gear 23 and the drive formed on the outer peripheral portion of the rotary wheel 16 are driven. The screw drive motor 25 is rotated in the direction shown by the arrow in FIG. 2 via the gear 24, and the substance to be dehydrated a supplied from the charging port 10 into the annular space 3 is transferred to the discharging port 11.

As shown in FIG. 3, the support member 8 for the outer cylinder 2 is also provided.
Of the ₁ to 8 ₅ , the annular convex portion 26 is provided on the inner surface of the through hole 7 of the supporting member 8 ₃ to 8 ₅ facing the tip portion from the central portion of the ribbon screw 4, and the outer peripheral portion of the ribbon screw 4 is provided. A concave portion 27 that engages with each annular convex portion 26 is formed in the concave portion 27.
The ribbon-like screw 4 is prevented from being displaced in the axial direction by the squeezing reaction force applied in the arrow B direction. The support members 8 ₃ to 8 ₅ are provided on the lower frame portion 35 fixed to the base 6.
And an upper frame portion 36 fixed to the lower frame portion 35 with a bolt 37.

As shown in FIG. 1, a cone valve 29 is slidably fitted over the tip of the inner cylinder 1, and a cylinder device 30 is provided between the cone valve 29 and the support frame 13a. By moving the cone valve 29 close to and away from the discharge port 11, the opening area of the discharge port 11 is appropriately adjusted so that the dehydrated product a can be squeezed with a desired squeezing force.

Explaining the procedure of squeezing and dehydrating, the inlet 10
The substance to be dehydrated a put into the annular space 3 between the inner and outer cylinders 1 and 2 is transferred toward the discharge port 11 by the ribbon screw 4, but the annular space 3 gradually narrows toward the tip. Therefore, it is squeezed and dehydrated during the transfer, and the water produced by the dehydration is drained to the outside through the drainage screens 9 and 20 formed in the inner and outer cylinders 1 and 2, and
The dehydrated substance a is discharged from the discharge port 11 to the outside.

In this case, the concave portion 27 provided on the ribbon-shaped screw 4 and the annular convex portion 26 provided on the outer cylinder are engaged with each other, and the ribbon-shaped screw 4 receives the squeezing reaction force and the axial direction. To be dehydrated a
Can be reliably squeezed and dehydrated, and the thickness of the ribbon-shaped screw 4 can be made thinner than in the conventional case.

In the above embodiment, the convex portion 26 is provided on the outer cylinder 2 side and the concave portion 27 is provided on the ribbon screw 4 side. Conversely, as shown in FIG. 4, an annular concave portion is provided on the outer cylinder 2 side. 32 may be provided, and a convex portion 33 that engages with the annular concave portion 32 may be provided on the ribbon-shaped screw 4 side.

Although both the inner and outer cylinders 1 and 2 are fixed and only the ribbon-shaped screw 4 is rotationally driven, both or one of the inner and outer cylinders 1 and 2 are ribbon-shaped screw 4.
It may be rotationally driven separately from. According to this, the shearing resistance of the dehydrated substance a is increased, and the pressing dehydration can be performed more effectively.

Further, although the drainage screens 9 and 20 are formed on both the inner and outer cylinders 1 and 2, they may be formed on only one of them.

[0021]

According to the present invention, the concave portion or the convex portion provided on the outer peripheral portion of the ribbon-shaped screw and the annular convex portion or the annular concave portion provided on the outer cylinder are engaged with each other, and the ribbon-shaped screw. Does not displace in the axial direction due to the crushing reaction force and do not squeeze, it is possible to squeeze and dehydrate the material to be dehydrated, and the high-quality and expensive ribbon-shaped screw thickness It can be made thinner and the production cost can be reduced.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a screw type dehydrator which is an embodiment of the present invention.

FIG. 2 is a view on arrow AA of FIG.

FIG. 3 is a perspective view of the same main part.

FIG. 4 is a vertical sectional view of a screw type dehydrator which is another embodiment of the present invention.

[Explanation of symbols]

 1 Inner Cylinder 2 Outer Cylinder 3 Annular Space 4 Ribbon Screw 9 Drainage Screen 10 Input Port 11 Discharge Port 20 Drainage Screen 26 Annular Convex Part 27 Recessed Part 32 Annular Recessed Part 33 Convex Part a

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Yoshihiro Utsu 5-3 28 Nishikujo, Konohana-ku, Osaka City, Osaka Prefecture Hitachi Shipbuilding Co., Ltd. No. 28 in Hitachi Shipbuilding Co., Ltd.

Claims (1)

[Claims] 1. A ribbon-shaped screw is rotatably disposed in an annular space between an inner cylinder and an outer cylinder, which are concentrically arranged, and the ribbon-shaped screw is rotatably driven to thereby rotate the outer cylinder. The material to be dehydrated introduced into the annular space from the inlet provided on the proximal side is squeezed and dehydrated, and the dehydrated water is drained to the outside through a drainage screen formed on one or both of the inner and outer tubes. In addition, in the dehydrator configured to discharge the dehydrated dehydrated material to the outside through the discharge port provided on the tip side of the outer cylinder, a concave portion or a convex portion is provided at an appropriate position on the outer peripheral portion of the ribbon screw. And an annular convex portion or an annular concave portion that engages with the concave portion or the convex portion and prevents the ribbon-shaped screw from being displaced in the axial direction, is provided on the inner peripheral portion of the outer cylinder. Type dehydrator.