JP2001066062A - Centrifugal film drier - Google Patents

Abstract

PROBLEM TO BE SOLVED: To lighten torsional stress and enhance scraping capacity. SOLUTION: This centrifugal film drier is provided with a main shaft 19 which is arranged rotatably, a fixed blade 37 which is attached to the main shaft 19, and a mobile blade 35 which rotates on the inner surface of a heat conductive drum 5 through the fixed blade 37, within the cylindrical heat conductive drum 5, and a hinge pin 49 is inserted into the hinge holes 45 and 46 which are provided at the blade hinge part 44 of the fixed blade 37 and the blade hinge part 43 of the mobile blade 35, respectively, and pierce them vertically, and the mobile blade 35 is coupled rotatably with the fixed blade 37, while the hinge hole 45 of the blade hinge 43 part of the mobile blade 35 is made in the shape of an ellipse orthogonal to the main axis of rotation extending from the center axis of the main shaft 19, and the large motion of the mobile blade 35 is secured by the play space of the ellipse.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a centrifugal thin film dryer.

[0002]

2. Description of the Related Art In general, a centrifugal thin-film dryer generally has an inner wall that is heated up and down to become a heat transfer cylinder.
A rotatable main shaft is arranged, and a blade is provided along the longitudinal direction of the main shaft. The upper part of the main body is an intake part for taking in sludge and the like, and the lower part is a take-out part for taking out sludge dried by evaporating water in the main body as dry powder.

[0003]

As shown in FIG. 7, the blade comprises a movable blade 101 and a fixed blade 103 formed in a plate shape. Fixed blade 10
3 is attached to the mounting seat 107 of the rotatable main shaft 105, and the movable blade 101 is attached to the fixed blade 103 by a hinge pin 109, respectively.
Is rotatable around a hinge pin 109 as a fulcrum.

As a result, the movable blade 101 is
As 05 rotates, it is shaken out by its centrifugal force,
The operating posture approaches the inner wall surface 113 serving as the heat transfer drum.
The movable blade in the operating position has the function of spouting wastewater sludge toward the heated inner wall surface and the dry blade adheres to the inner surface,
It has a function of scraping the grown sludge, and is disposed over the evaporating zone, the slurry zone, and the powder zone from above the vertically long main body 111. In particular, a large scraping resistance acts on the movable blade 101 from the slurry zone where the water content evaporates and the water content decreases to the powder zone.

[0005] The scraping resistance increases as it descends because the drying proceeds each time it descends, but it is not always uniform. Further, the thin film layer adhered and dried on the inner wall surface 113 is not uniform, and a torsional stress occurs in the vertically long movable blade 101 formed in a plate shape due to these resistance conditions.

The torsion stress causes an excessive load to be applied to the hinge pin 109. As a means to prevent damage from being caused by metal fatigue when it is repeated,
For example, as shown in FIG. 8, the hinge hole 113 into which the hinge pin 109 is inserted is provided with allowances in the X direction and the Y direction, so as to reduce the torsional stress.

[0007] The play allowance in the X direction is such that, with respect to the rotational direction, the upper side of the movable blade 101 with respect to the blade axis is forwardly inclined (solid line), and retracted backwardly inclined (chain line).
Movement to is possible.

The play allowance in the Y direction is determined by the movable blade 1
The movement between an approaching posture in which the upper end of 01 is closer to the inner wall surface (a chain line in FIG. 7) (at this time, the lower end is in a retracted posture away from the inner wall surface) and a moving posture in which the upper end of 01 is away from the inner wall surface 113 (in this case, an approaching posture approaching the lower end). By being possible, the torsional stress is reduced.

The movement of the movable blade 101 in the X direction and the Y direction has a function of easily scraping sludge adhering to the inner wall surface 113 by the movement and a function of scraping small pieces accumulated on the front surface of the movable blade 101. However, since the movement of the movable blade 101 in the X and Y directions is small, the scraping ability is small.

Accordingly, an object of the present invention is to provide a blade of a centrifugal thin film dryer capable of improving the scraping ability by a simple device.

[0011]

According to the first aspect of the present invention, there is provided a cylindrical heat transfer drum,
A main shaft rotatably arranged in the heat transfer drum, a fixed blade attached to the main shaft, a movable blade rotating the inner surface of the heat transfer drum through the fixed blade, and a fixed blade connecting the movable blade and the fixed blade. In a centrifugal thin film dryer having a blade hinge portion and a movable blade blade hinge portion, hinge blades penetrating vertically are provided in the movable hinge blade portion and the fixed blade blade hinge portion, respectively. A hinge pin is inserted into the hinge hole of the movable blade and the movable blade is rotatably coupled to the fixed blade, while the hinge hole of the blade hinge portion of the movable blade is orthogonal to the rotation main axis extending from the center axis of the main shaft. The shape should be a matching long hole.

[0012] Thus, the hinge hole in the long hole state,
Since a large play allowance can be secured in the long hole direction,
A large movement of the movable blade corresponding to the play allowance is obtained. As a result, during operation, a large lump accumulated on the front surface of the movable blade can be reliably crushed into small pieces, and the adhered layer that has adhered and grown on the inner wall surface can be efficiently scraped off.

According to a second aspect of the present invention, a cylindrical heat transfer cylinder, a main shaft rotatably disposed in the heat transfer cylinder, a fixed blade attached to the main shaft, and a fixed blade are provided. A movable blade rotating the inner surface of the heat transfer drum, and a centrifugal thin film dryer having a blade hinge portion of a fixed blade and a blade hinge portion of a movable blade connecting the movable blade and the fixed blade; With the blade hinge part of the fixed blade,
While providing hinge holes vertically penetrating, inserting a hinge pin into the hinge hole of each blade hinge portion, and rotatably coupling the movable blade to the fixed blade,
The fixed blade is attached to the main shaft so as to be rotatable by a predetermined angle around a rotation main axis extending from a center axis of the main shaft.

Accordingly, the movable blade can rotate by a predetermined angle, and a large movement corresponding to the rotation angle can be obtained. As a result, a large lump accumulated on the front surface of the movable blade during operation can be surely crushed into small pieces, and the adhesion layer that has adhered and grown on the inner wall surface can be efficiently scraped off.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a first embodiment of the present invention will be described in detail with reference to FIGS.

In FIG. 3, reference numeral 1 denotes a main body of the centrifugal thin film dryer 3. The main body 1 has a double structure,
Heated steam is fed between the inner wall surface 5 and the outer wall surface 7 having the double structure, so that the inner wall surface 5 constitutes a heated heat transfer cylinder.

The upper portion of the main body 1 has an upper body 13 provided with a steam outlet 9 and a sludge inlet 11. Inside the upper body 13, the sludge from the sludge inlet 11 is uniformly rotated by rotation. A dispersing ring 15 for dispersing and applying pressure downward is provided. The lower part of the main body 1 is a powder take-out section 17 for taking out dry powder.

Inside the main body 1, a vertically long main shaft 19 is provided.
The upper end of the main shaft 19 is rotatably supported by an upper bearing 21 provided on the upper body 13, and the lower end is rotatably supported by a lower bearing 23 provided on a lower end of the body 1. .

The main shaft 19 is extended upward from the upper body 13, and extends around the V pulley 25 provided on the extension shaft 19a and the V pulley 29 of the electric motor 27.
1, the rotational power of the electric motor 27 is provided.

Further, blades 33 are mounted on the main shaft 19 along the longitudinal direction, and the blades 33 thus mounted are arranged in four rows in this embodiment.

As shown in FIGS. 1 and 2, the blade 33 includes a vertically movable plate-like movable blade 35 and a fixed blade 37. The fixed blade 37 is
Is fixedly supported by a fixing bolt 41 on a mounting seat 39 provided at the bottom.

The fixed blade 37 and the movable blade 35 are provided with blade hinge portions 43 and 44, respectively.
The blade hinge portion 43 of the movable blade 35 has a pair of upper and lower shapes so as to sandwich the blade hinge portion 44 of the fixed blade 37 from above and below.

The hinge portions 43 and 44 of the movable blade 35 and the fixed blade 37 are provided with hinge holes 45 and 46 penetrating vertically, respectively.
The hinge hole 46 on the side is circular. Movable blade 3
5 has a long hole shape orthogonal to the rotation main axis Z extending radially from the main shaft axis P of the main shaft 19, and each of the hinge holes 45 and 46 has a movable blade 3.
A hinge pin 49 having a circular section serving as a rotation axis of No. 5 is inserted therethrough.

Thus, the movable blade 35 is moved in such a manner that the scraping surface 35a faces the rotation direction,
7 and a hinge hole 45.
Allows a large movement in the X direction relative to the Y direction.

On the other hand, a U-shaped notch 51 is provided substantially at the center of the blade tip of the movable blade 35 facing the inner wall surface 5 of the main body 1, and the scraping surface 35a is formed. On the tip side, the shape is divided into upper and lower parts.

According to the centrifugal thin film dryer 3 configured as described above, the movable blade 35 of the blade 33 receives the action of the centrifugal force by the rotation of the main shaft 19, and the tip of the blade approaches the inner wall surface 5. At the same time, the dispersing ring 15 is
The wastewater sludge sent from 1 is centrifuged and the inner wall 5
, And apply pressure downward. The drainage sludge dispersed by the dispersing ring 15 is further formed into a thin uniform liquid film by the movable blade 35, and descends along the inner wall surface 5 with a pressure from above. At this time, moisture is evaporated by heat given from the inner wall surface 5 serving as a heat transfer surface, and a slurry is formed. A part of the thin film layer which has been slurried and grown to a certain degree or more is scraped off by the movable blade 35, and the scraped product is subjected to the action of centrifugal force by the movable blade 35 to the inner wall 5 from the gap formed at the blade tip. Move down along. During the downward movement, the evaporation proceeds and loses water to solidify. The solidified sludge is
The water content further decreases, and is turned into powder by the action of the rotating movable blade 35, and is discharged from the powder outlet 17 as dry powder to the outside.

On the other hand, the evaporated vapor is discharged to the outside through the vapor discharge port 9 and then condensed by a condenser (not shown) or the like and collected and disposed.

In a series of these operations, the drainage sludge becomes a non-working area on the scraping surface 35a of the movable blade 35 when the sludge changes into a slurry, solidified, or powdered as the water content decreases. When the scraping resistance acts on the lower side or the upper side of the notch portion 51 in a biased manner, the movable blade 35 has a play margin of the hinge hole 45 as shown by a solid line in FIG. Then, it greatly moves in the X direction.

At the same time, by moving in the Y direction, the torsional stress is reduced, and the load acting on the hinge pin 49 can be reduced.

On the other hand, the movable blade 35 moves large in the X direction and moves small in the Y direction, so that a large lump accumulated on the front surface of the scraping surface 35a is surely crushed into small pieces. It passes through the gap created between the wall 5 and the wall 5 without any trouble. This greatly improves the scraping ability.

FIG. 6 shows a second embodiment of the blade 33.

That is, the upper and lower blade hinges 55 of the fixed blade 37 and the upper and lower blade hinges 57 of the movable blade 35 are hinged by hinge pins 61 inserted into upper and lower hinge holes 59 provided in the blade hinges 55, 57. While being rotatably connected, the base end of the fixed blade 37 is arranged along a rotation main axis Z extending radially from the center axis P of the main shaft 19, and the central portion of the end edge thereof is connected to the main shaft. The mounting shaft 63 fixed to the outer circumferential surface of the
5, it is fixedly supported so as to be rotatable by a predetermined angle in the direction of arrow A. The rotation range is set by hitting left and right stoppers 67 provided on the mounting seat 63.

Since the other components are the same as those of the first embodiment, the same reference numerals are used and the detailed description is omitted.

Therefore, according to the second embodiment, the scraping resistance acts on the scraping surface 35a, so that it largely moves in the X direction about the support shaft 65.
As a result, a large lump collected on the front surface of the scraping surface 35a can be efficiently and reliably crushed into small pieces, so that the blade tip and the inner wall surface pass through the gap formed therebetween without any trouble, and the scraping ability is improved. Significantly improved.

[0035]

As described above, according to the present invention, the movement of the blade for scraping the sludge can be increased, so that the torsional stress due to the scraping resistance can be reduced. As a result, the large movement of the blade makes it possible to efficiently and surely crush the large lump accumulated on the front surface of the scraping surface into small pieces. As a result, the scraping ability can be significantly improved.

[Brief description of the drawings]

FIG. 1 is a schematic side view of a part showing a blade structure of a centrifugal thin film dryer according to the present invention.

FIG. 2 is an explanatory diagram showing a relationship between a hinge pin and a hinge hole.

FIG. 3 is a schematic perspective view of the whole of the centrifugal thin film dryer with a part cut away.

FIG. 4 is a schematic plan view of FIG. 1 as viewed from above.

FIG. 5 is an explanatory view of the operation of the blade.

FIG. 6 is a schematic perspective view of a part of a blade showing a second embodiment.

FIG. 7 is a schematic side view similar to FIG. 1 showing a conventional example.

FIG. 8 is an operation explanatory diagram of a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Main body 3 Centrifugal thin film dryer 5 Inner wall surface (heat transfer cylinder) 19 Main shaft 33 Blade 35 Movable blade 37 Fixed blade 43/44 Blade hinge part 45 Hinge hole 49 Hinge pin 51 Notch Z Rotation main axis

Claims (2)

[Claims] 1. A cylindrical heat transfer drum, a main shaft rotatably arranged in the heat transfer drum, a fixed blade attached to the main shaft, and a movable blade rotating on the inner surface of the heat transfer drum via the fixed blade. And a centrifugal thin film dryer having a fixed blade blade hinge portion and a movable blade blade hinge portion connecting the movable blade and the fixed blade, wherein the movable blade blade hinge portion and the fixed blade blade hinge portion Are provided respectively, and a hinge pin is inserted into the hinge hole of each blade hinge part, and the movable blade is rotatably coupled to the fixed blade, while the hinge hole of the blade hinge part of the movable blade is A centrifugal thin film dryer characterized in that it has a long hole shape orthogonal to a rotating main axis extending from a center axis of the main shaft. 2. A cylindrical heat transfer drum, a main shaft rotatably disposed in the heat transfer drum, a fixed blade attached to the main shaft, and a movable blade rotating on the inner surface of the heat transfer drum via the fixed blade. And a centrifugal thin film dryer having a fixed blade blade hinge portion and a movable blade blade hinge portion connecting the movable blade and the fixed blade, wherein the movable blade blade hinge portion and the fixed blade blade hinge portion Hinge holes that penetrate through each of the blades, and a hinge pin is inserted into the hinge hole of each blade hinge portion to rotatably couple the movable blade to the fixed blade. Centrifugal thin-film drying device which is rotatably mounted at a predetermined angle about a rotation main axis extending from a central axis of the thin film. Machine.