JP2512683B2 - Screw type dehydrator - Google Patents

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 this type of dehydrator, the dehydrator is provided in an annular space between an inner cylinder and an outer cylinder, which are concentrically arranged, and both the inner and outer cylinders, and a base end portion is rotated between the inner and outer cylinders. A ribbon-shaped screw supported freely is provided, and the substance to be dehydrated introduced into the annular space from an inlet provided on the base end side of the annular space is squeezed and dehydrated by the ribbon-shaped screw, and the squeeze dehydration is performed. There is one in which the dehydrated product is discharged to the outside from a discharge port provided on the tip side of the annular space.

[0003]

SUMMARY OF THE INVENTION In the above conventional configuration,
The base end of the ribbon-shaped screw is only supported by both the inner and outer cylinders, and there is nothing to support the front end, so the front end is elastically deformed by the compression reaction force and easily contracts toward the base end. It is not possible to sufficiently squeeze the material to be dehydrated. Therefore, it is conceivable to increase the wall thickness of the entire ribbon-shaped screw to prevent elastic deformation. However, this increases the weight, and it is necessary to increase the strength of the dehydrator as a whole and the drive device for the ribbon-shaped screw. As a result, a large size is required, and there is a drawback that the manufacturing cost is high.

In view of the above-mentioned conventional problems, the present invention is a screw in which the tip end side of the ribbon-shaped screw is not contracted to the base end side by a crushing reaction force without increasing the thickness of the entire ribbon-shaped screw. The purpose is to provide a dehydrator.

[0005]

In order to achieve the above object, the invention according to claim 1 is arranged in a concentric inner cylinder and an outer cylinder, and in an annular space between the inner and outer cylinders. And a ribbon-shaped screw that transfers the substance to be dehydrated introduced into the annular space from the inlet provided on the proximal end side of the outer cylinder toward the outlet, and the proximal end in the annular space. The side is a squeezing dehydration zone for squeezing the substance to be dehydrated and draining the moisture to the outside from the drainage screen formed in one or both of the inner and outer cylinders, and the tip side in the annular space squeezes the substance to be dehydrated in a compacted manner. In a screw type dehydrator configured as a plug zone, a support ring is fitted to the tip end side of the ribbon screw, and the support ring is rotatably supported on the outer cylinder side. is there.

According to a second aspect of the present invention, the portion of the ribbon-like screw from the support ring fitting portion to the tip end side is formed thicker than the other portions.

[0007]

According to the first aspect of the present invention, the substance to be dehydrated, which has been charged from the charging port into the annular space between the inner and outer cylinders, is transferred toward the discharging port by the ribbon screw, and is squeezed and dehydrated during the transfer. It is squeezed and dehydrated in the zone, and the water generated by the dehydration is drained to the outside through the drainage screen formed in one or both of the inner and outer cylinders, and the dehydrated material is squeezed in the plug zone during the transfer. It is discharged to the outside through the discharge port after being made to be in a compacted state, but since the tip end side of the ribbon-like screw is rotatably supported by the outer cylinder via the support ring, the tip end side is It does not shrink toward the base end side due to the compression reaction force, and it is possible to reliably compress the product to be dehydrated without increasing the thickness of the ribbon-shaped screw.

According to the second aspect of the present invention, since the portion of the ribbon-shaped screw from the support ring fitting portion to the tip portion side is formed thicker than the other portions, the tip portion of the ribbon-shaped screw is formed. Does not shrink due to excessive squeezing reaction force, and it is possible to more reliably squeeze the material to be dehydrated in the plug zone.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 show a screw type dehydrator according to a first embodiment of the present invention, in which an inner cylinder 1 and an outer cylinder 2 are shown.
And a ribbon-shaped screw 4 rotatably disposed in an annular space 3 formed between the inner and outer cylinders 1 and 2.

The outer cylinder 2 has an outer cylinder body 2a having a drainage screen 5 consisting of a large number of drainage holes 5a, and a predetermined gap α is provided at the tip of the outer cylinder body 2a via a support frame 6. The outer cylinder tip portion 2b integrally concentrically connected,
The outer cylinder 2 is fixed on a base 8 via the support frame 6 and the support plate 7. An inlet 9 for the dehydrated product a is formed at the base end of the outer cylinder main body 2a, and a drainage for discharging the dehydrated dehydrated product a to the outside is provided at the tip opening of the outer cylinder front end 2b. An outlet 10 is formed. A water receiving tank (not shown) is provided below the outer cylinder 2.

The inner cylinder 1 has a drainage screen 12 consisting of a large number of drainage holes 12a, the tip of which protrudes from the outlet 10 to the outside and is fixed to the base 8 via a support plate 13, and The base end portion is the base end side end plate 14 of the outer cylinder body 2a.
The inner cylinder 1 is inserted into a through hole formed in the inner cylinder 1.
Are arranged concentrically with the outer cylinder 2.

A squeezing dehydration zone 3a is formed on the base end side of the annular space 3 corresponding to the drainage screens 5 and 12, and the substance to be dehydrated a is compacted corresponding to the outer cylinder tip 2b in the annular space 3. A plug zone 3b that is squeezed into is formed.

The ribbon-shaped screw 4 is arranged in the squeezing dehydration zone 3a, and a support ring 16 having the same diameter and the same diameter as the outer cylinder 2 is fitted to the tip end portion of the ribbon-shaped screw 4 and the support ring 16 supports the support frame. A ribbon-shaped screw support device 17 including a bearing ring 17a, a bush 17b, and a sealant 17c provided inside the body 6 is rotatably supported in a watertight state, and is attached to a ring gear 20 fitted on the rotary ring 16 by a pinion. 21 are meshed with each other, and by rotating the pinion 21 by a drive motor 22, the ribbon-shaped screw 4 is rotated in a direction indicated by an arrow in FIG.
The substance to be dehydrated a supplied from the charging port 9 into the annular space 3 is transferred toward the discharging port 10.

The cone valve 24 slidably fitted on the tip of the inner cylinder 1 is moved back and forth along the inner cylinder 1 by the cone valve drive cylinder 25, whereby the opening of the discharge port 10 is increased. It is supposed to be adjusted.

Explaining the procedure of squeezing and dehydrating, the substance to be dehydrated a, which has been charged from the charging port 9 into the annular space 3 between the inner and outer cylinders 1 and 2, is transferred toward the discharging port 10 by the ribbon screw 4. Squeezed and dehydrated in the squeezing and dehydrating zone 3a on the way, water generated by the dehydration is drained to the outside through the drainage screens 5 and 12 formed in the inner and outer cylinders 1 and 2,
Further, the dehydrated substance a to be dehydrated is squeezed by the cone valve 24 and the ribbon-shaped screw 4 in the plug zone 3b in the middle of transfer to be in a compressed state, and then discharged from the discharge port 10 to the outside.

When the material to be dehydrated a is squeezed as described above, an excessive squeezing reaction force generated by the squeezing is applied to the tip portion of the ribbon-shaped screw 4.
Since the ribbon-shaped screw 4 is rotatably supported by the outer cylinder 2, the tip end side of the ribbon-shaped screw 4 is not elastically deformed by the squeeze reaction force and is not contracted to the base end side. It is possible to reliably squeeze the dehydrated product a without increasing the size.

In the above embodiment, the supporting frame 6 having the ribbon-shaped screw supporting device 17 is provided at a position in contact with the plug zone 3b in the squeezing dehydration zone 3a, but as shown in FIG. You may provide 6 in the position near the center in the pressing dehydration zone 3a. Further, as the outer cylinder 2, a straight pipe whose base end portion and tip end portion have the same diameter is used, but as shown in FIG. 3, a tapered pipe which is tapered toward the tip end portion may be used. Good. According to this, the pressing rate of the dehydrated substance a can be further increased (second embodiment).

Further, as shown in FIG. 4, a ribbon-shaped screw supporting device 17 may be provided on the base end side of the ribbon-shaped screw 4. As a result, the ribbon-shaped screw 4 can be driven to rotate more smoothly (third embodiment).

Furthermore, as shown in FIG. 5, the thickness T of the portion of the ribbon-like screw from the support ring fitting portion to the tip end side may be made larger than the thickness t of the other portions.
As a result, the tip end portion of the ribbon-shaped screw 4 is prevented from contracting due to the excessive compression reaction force, and the plug zone 3
It is possible to more reliably squeeze the dehydrated material a in b. The ribbon-shaped screw supporting device 1 shown in FIG.
7 is a support ring 2 fitted to the ribbon-shaped screw 4.
6 has a slewing bearing 17d that bears the load and bending moment in the thrust and radial directions, and a pair of seal members 17e, 17e in contact with both side surfaces of the support ring 26. The pinion 21 meshing with the integrally formed ring gear 20 is connected to the drive motor 22.
The ribbon-shaped screw 4 can be rotationally driven by rotationally driving (4th Example).

In each of the above embodiments, the ring gear 20
Alternatively, a power transmission mechanism including a chain mechanism may be used instead of the pinion 21. Further, the power transmission mechanism may be provided at the base end portion of the ribbon-shaped screw 4, and the ribbon-shaped screw 4 may be rotationally driven from the base end portions of the inner and outer cylinders 1 and 2.

Although the inner and outer cylinders 1 and 2 are fixed and only the ribbon-shaped screw 4 is rotationally driven, either or both of the inner and outer cylinders 1 and 2 are rotated separately from the ribbon-shaped screw 4. It may be driven. According to this, the shearing resistance of the dehydrated substance a is increased, and the pressing dehydration can be performed more effectively. Although the drain screens 5 and 12 are formed on both the inner and outer cylinders 1 and 2, they may be formed on only one of them.

Further, as shown in FIG. 5, the thickness of the ribbon-shaped screw 4 is changed to T and t, but it can be changed in a plurality of steps as required.
Although the inner diameter of the ribbon screw 4 is shown as straight (cylindrical), the inner diameter of the ribbon screw 4 may be tapered and the inner cylinder 1 may be tapered.

[0023]

According to the first aspect of the present invention, since the tip end side of the ribbon-shaped screw is rotatably supported by the outer cylinder via the support ring, the tip end side is squeezed by the crushing reaction force. It does not shrink to the side, and it is possible to reliably squeeze the material to be dehydrated without increasing the thickness of the ribbon-shaped screw.

According to the second aspect of the invention, since the portion of the ribbon-like screw from the support ring fitting portion to the tip end side is formed thicker than the other portions, the tip end portion of the ribbon-like screw. Does not shrink due to excessive squeezing reaction force, and it is possible to more reliably squeeze the material to be dehydrated in the plug zone.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a screw type dehydrator that is a first embodiment of the present invention.

FIG. 2 is a view as viewed in the direction of arrows AA in FIG. 1;

FIG. 3 is a vertical sectional view of a screw type dehydrator which is a second embodiment of the present invention.

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

FIG. 5 is a vertical cross-sectional view of a screw type dehydrator which is a fourth embodiment of the present invention.

[Explanation of symbols]

 1 Inner Cylinder 2 Outer Cylinder 3 Annular Space 3a Squeeze Dewatering Zone 3b Plug Zone 4 Ribbon Screw 5 Drain Screen 9 Input Port 10 Discharge Port 12 Drain Screen 16 Support Ring 17 Ribbon Screw Support Device 24 Cone Valve 26 Support Ring a Dehydrated Thickness T Thickness

Claims (2)

(57) [Claims] 1. An inner cylinder and an outer cylinder, which are concentrically arranged, and an annular space between the inner and outer cylinders. And a ribbon-shaped screw for transferring the dehydrated substance that has been charged to the discharge port toward the discharge port, and the proximal end side in the annular space squeezes the dehydrated substance to form one or both of the inner and outer cylinders. In the screw type dehydrator, which is a compression dehydration zone for draining water from the drainage screen to the outside, and the tip side of the annular space is a plug zone for compressing the dehydrated material in a compacted manner, in which the tip portion of the ribbon screw is The screw type dehydrator is characterized in that a support ring is fitted on the side, and the support ring is rotatably supported on the outer cylinder side. 2. The screw type dehydrator according to claim 1, wherein a portion of the ribbon-shaped screw from a support ring fitting portion to a tip end side is formed thicker than other portions.