KR102037588B1 - Centrifugal dehydration device - Google Patents

Abstract

The wing member 25 is protruded and formed in the peripheral surface of the cylindrical external ball 8 to which water is supplied, and the rotational cylinder 23 accommodated in the external ball 8, and propels the water in the axial direction. Of the rotary body 2 which has the internal-dynamic screw 22, and dehydrates using centrifugal force, conveying water-containing water, and the discharge passage 27 of the water-containing water formed in the one end of the external direction ball 8 in the propulsion direction front side. A centrifugal dewatering device having a valve body (17) formed so as to be adjustable in an axial width thereof is provided.

Description

Centrifugal dewatering device {CENTRIFUGAL DEHYDRATION DEVICE}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a centrifugal dewatering device for separating solids and liquids using a centrifugal force as a means for dewatering various water sludges and the like.

This application claims priority about Japanese Patent Application No. 2014-004368 for which it applied on January 14, 2014, and uses the content here.

As a centrifugal dewatering device that separates solids and liquids using centrifugal force, solid-liquid separation is performed by applying centrifugal force by rotation of an external sinus bowl, and solid and liquid fractions are separated by an internal copper screw. BACKGROUND ART Centrifugal dewatering devices are known which carry out in-flight conveyance and discharge of a heavy component, for example, a dewatered cake.

In such a centrifugal dewatering device, dehydration of dewatered cakes and the like is promoted by solid-liquid separation and self-pressurization by centrifugal force and compression force of discharge resistance. In the dehydration by the pressing force using the discharge resistance, for example, the discharge resistance is increased by reducing the flow path area of the discharge port. That is, the condensation effect is given to the dewatered cake discharged | emitted from an outlet by making a discharge opening into a narrow structure (for example, refer patent document 1).

Japanese Unexamined Patent Publication No. 2002-153772

By the way, when the outlet is made into narrow structure, the phenomenon which the fiber powder and crystal | crystallization (magnesium phosphate) contained in a dehydration cake adhere to a narrow outlet is known. As this fiber powder or crystal grows, the flow path is blocked. In particular, when trying to further increase the pressing force to improve the performance, the discharge port is reduced or the length of the discharge port is long, the fiber powder or crystals are more adhered.

Moreover, the structure which automatically adjusts the width | variety of a discharge port is described in the centrifugal dewatering apparatus of patent document 1 according to the discharge pressure of a dehydration cake. This structure has the adjustment ring which can change the width | variety of a discharge port, and the spring which supports an adjustment ring, and adjusts the moisture content of a dewatering cake by changing the spring constant of a spring, for example. However, this structure has a problem that the discharge pressure of the dewatered cake is not sufficiently transmitted.

An object of the present invention is to provide a centrifugal dewatering device having a discharge structure in which fibers or crystals contained in the water are hardly adhered while maintaining sufficient discharge resistance to the water discharged from the centrifugal dewatering device.

According to the first aspect of the present invention, in the centrifugal dewatering device, a wing member protrudes from a cylindrical external ball to which water is supplied, and a circumferential surface of a rotary motion accommodated in the external ball, and is formed in the axial direction. A rotational body having an internally-driven screw to be propelled in the air, and dehydrating using centrifugal force while conveying the water-containing material, and an axial width of the discharge passage formed in one end of the forward direction of the externally-actuated ball. It is characterized by having a valve body formed as possible.

According to the said structure, even when a fiber powder or crystal | crystallization adheres to a discharge path, the fiber powder or crystal | crystallization adhered to a discharge path | path can be removed by moving the valve body which can adjust the width | variety of a discharge path. That is, the discharge passage is narrowed by the attachment, and the discharge pressure rises, the valve body moves, the width of the discharge passage is widened, and the obstruction at the time of discharging the water can be prevented by removing the deposit. In addition, the discharge resistance can be imparted to the water by narrowing the width of the discharge passage. In addition, the water content can also be adjusted by adjusting the width of the discharge passage.

In the centrifugal dewatering device, the valve body may have a configuration in which an elastic force is applied in a direction of decreasing the width.

According to the said structure, the width | variety of a discharge path increases by the increase of the pressure force accompanying a fall of the water content of water, and the residence time of water is shortened. In addition, the width of the discharge passage decreases due to the decrease in the pressure pressure accompanying the increase in the water content of the water, which leads to a long residence time of the water. Thereby, it becomes the residence time according to the water content of the water, and it is possible to minimize the fluctuation of the water content of the water.

For example, when elastic force is given by the spring, the moisture content of the water can be adjusted by adjusting the initial length of the spring (it can be arbitrarily selected whether the state of the spring at the time of assembly is a natural length or the compression side) and the spring constant. .

In the centrifugal dewatering device, the actuator may be configured to move the valve body in a direction of increasing or decreasing the width in accordance with the pressure of the water.

According to the above constitution, the width of the discharge passage is increased with increasing pressure pressure accompanying the decrease in the water content of the water, and the residence time of the water is shortened, and the pressure pressure accompanying the increase in the water content of the water is reduced. By reducing the width of the discharge passage, the residence time of the water can be extended. Thereby, it becomes the residence time according to the water content of the water, and it is possible to minimize the fluctuation of the water content of the water.

In the centrifugal dewatering device, a valve seat surface formed on the outer bowl and in surface contact with the valve body may be formed in a truncated conical shape as it extends toward the propulsion direction of the water-containing product. .

Since the discharge passage formed by the valve seat surface and the valve body is shaped to face radially outward along the direction in which the centrifugal force is applied, the discharge of the water is smoother.

According to the second aspect of the present invention, in the centrifugal dewatering device, a wing member protrudes from a cylindrical external ball to which water is supplied, and a circumferential surface of the rotary motion through which the external ball is inserted. A rotating body dehydrating using centrifugal force while conveying said water, a plurality of guide vanes disposed inclined with respect to the direction of propulsion of said water and narrowing each other toward downstream; And a water discharge hole formed at one end of the forward direction of the external ball in a forward direction and discharging the water content compressed by the plurality of guide vanes.

According to the above configuration, the discharge resistance is generated in the water content by colliding with the guide vanes in the process of pushing the water content, it is possible to impart a pressing force to the water. In addition, since the compressed water is discharged by the water discharge hole in front of the propulsion direction of the guide vane, it is possible to prevent clogging when discharging the water. In addition, the water content can be adjusted by changing the placement angle of the guide vanes.

In the said centrifugal dewatering apparatus, even if the said externally-actuated ball | bowl has a cylindrical linear motion part and a truncated taper part, the said some guide vane protrudes from the said taper part to the inner peripheral side, and it is set as the structure. do.

According to the said structure, a crimping force can be given to a water content by the discharge resistance by the guide vane formed in a taper part.

According to the present invention, sufficient discharge resistance can be given to the water discharged from the centrifugal dewatering device. Moreover, it can be set as the discharge structure to which the fiber powder and a crystal | crystallization contained in a water content do not adhere well. In addition, the water content can also be adjusted by adjusting the width of the discharge passage (of the first aspect) or the angle of the guide vane (of the second aspect).

1: is sectional drawing of the vertical direction which shows the centrifugal dewatering apparatus of 1st Embodiment of this invention.
It is sectional drawing which shows the cake discharge hole vicinity of the centrifugal dewatering apparatus of 1st Embodiment of this invention.
3 is a cross-sectional view showing a state where the back pressure valve of the first embodiment of the present invention is closed and the enlarged diameter surface and the inclined surface are in surface contact.
4 is a cross-sectional view showing a state in which the back pressure valve of the first embodiment of the present invention is opened and the distance between the enlarged diameter surface and the inclined surface is larger than the standard interval.
5 is a cross-sectional view showing a back pressure valve according to a modification of the first embodiment of the present invention.
It is sectional drawing of the vertical direction which shows the centrifugal dewatering apparatus of 2nd Embodiment of this invention.
It is sectional drawing which shows the cake discharge hole vicinity of the centrifugal dewatering apparatus of 2nd Embodiment of this invention.
8 is an exploded view illustrating the arrangement of guide vanes of the centrifugal dewatering device according to the second embodiment of the present invention.

(1st embodiment)

FIG. 1: is sectional drawing of the vertical direction which shows the centrifugal dehydration apparatus 1. As shown in FIG. The centrifugal dewatering device 1 is called a so-called linear type, and the feed body inserted into the inside from the supply side end part of the rotating body 2 formed in the cavity shape inside this cavity 2 is formed. A pipe 3, a casing 4 for accommodating a longitudinal center portion of the rotating body 2, a pair of support units 5 formed at both longitudinal ends of the rotating body 2, and a rotating body 2 ) Is provided with a drive unit 6 for rotationally driving.

The rotating body 2 is separated into a dewatered cake and a separation liquid by dewatering using centrifugal force while conveying the water, such as sludge supplied inside. This rotating body 2 is provided with the hollow cylindrical external moving ball 8 and the internal moving screw 22 which is accommodated in the inside of this external moving ball 8, and propels a water content in the axial direction.

The centrifugal dehydration apparatus 1 solid-liquid-separates the water-containing water introduced through the feed pipe 3 from the left side of FIG. 1, and makes the dewatering cake the front end of the water-propelling direction, while being the 1st end side of the external bowl 8. Eject from. In the following description, while it is the 1st end side of the external bowl 8, the propulsion direction front side of a water content is called a discharge side, and the 2nd end side opposite to a 1st end side is called a supply side. Moreover, the central axis O of the rotating body 2 is called the central axis O, and the longitudinal direction of the rotating body 2 is called the axial direction.

The water is supplied to the inside of the outer bowl 8. The external ball 8 is provided with the ball main body 9 which is a cylindrical hollow casing, and the hollow external rotating shaft 10 which protruded to both sides from the longitudinal direction both ends of the ball main body 9, and was formed.

At the supply side end of the ball main body 9, a separation liquid discharge hole 11 for discharging the separation liquid separated from the water is formed. At the discharge side end of the ball body 9, a cake discharge hole 12 for discharging the dewatered cake separated from the water is formed.

Moreover, the protrusion 13 extended in the circumferential direction of the ball main body 9 is formed in the inner peripheral surface of the ball main body 9 adjacent to the cake discharge hole 12. As shown in FIG. 2, the protrusion 13 has the shaft diameter surface 14 which forms the truncated conical shape which the cross-sectional shape seen from the circumferential direction narrows the inner diameter of the ball main body 9 from a supply side to a discharge side, It has an enlarged diameter surface 15 (valve seat surface) which forms a truncated cone shape which widens the inner diameter of the ball main body 9 from a supply side toward a discharge side. In other words, the protrusion 13 has the triangular shape in which the shape seen from the circumferential direction corresponds to the inner peripheral surface of the ball main body 9.

Returning to FIG. 1, in the state where the external rotating shaft 10 is arrange | positioned so that the external rotating shaft 10 may extend in a horizontal direction, the both ends are rotatably supported by the support unit 5 about the axis from below. . Thereby, the ball main body 9 is hold | maintained at the predetermined height position from the installation surface F. As shown in FIG.

The inner copper screw 22 conveys to the discharge | release side, stirring a water content in the inside of the outer bowl 8. The internal screw 22 projects in a radial direction from the circumferential surface of the substantially cylindrical rotary motion 23 and the circumferential surface of the rotary motion 23, in which a slightly large feed zone 24 is formed at the central portion in the longitudinal direction, and spirally axially. It has the wing member 25 extended by the. In the feed zone 24 of the rotary cylinder 23, a supply hole 26 communicating with the outer bowl 8 is formed through.

The internal motion screw 22 is accommodated in the inside of the external motion ball 8, and the internal motion rotation shaft 16 which protrudes from the axial direction both ends of the rotation motion 23 is the external motion rotation axis of the external motion ball 8 ( 10) are respectively inserted in the interior. The inner rotating shaft 16 on the supply side has a hollow structure. In addition, the pitch with respect to the axial direction of the blade member 25 can be changed arbitrarily, for example, it can be set as a fixed pitch or a taper pitch.

The back pressure valve 17 which is a valve body is formed in the ball main body 9 and in the vicinity of the end wall 19 of a discharge side. The back pressure valve 17 is attached to the end wall 19 of the discharge side of the ball body 9 via a plurality of compression coil springs 18. In other words, the back pressure valve 17 is connected to the end wall 19 via the compression coil spring 18. The back pressure valve 17 is not fixed to the ball main body 9 or the rotary motion 23.

As shown in FIG. 2, the back pressure valve 17 has a disk shape having a through hole 20 at the center thereof, and an internal moving screw 22 is inserted through the through hole 20. The back pressure valve 17 is an outer diameter slightly smaller than the inner diameter of the ball body 9.

Moreover, the inclined surface 21 extended in diameter from the supply side to the discharge side is formed in the edge part of the outer peripheral side of the back pressure valve 17. As shown in FIG. The angle of the inclined surface 21 is an angle equivalent to the angle of the enlarged diameter surface 15 of the protrusion 13 of the ball main body 9. That is, the inclined surface 21 of the back pressure valve 17 is formed so that the inclined surface 21 and the enlarged diameter surface 15 may surface-contact by moving the back pressure valve 17 to a supply side. Thereby, the diameter expansion surface 15 functions as a valve seat surface of the back pressure valve 17 which is a valve body.

Between the enlarged diameter surface 15 of the ball main body 9, and the inclined surface 21 of the back pressure valve 17, the cake discharge passage 27 which squeezes a dewatered cake toward the cake discharge hole 12 is formed. The back pressure valve 17 is attached to the ball body 9 via the compression coil spring 18, whereby the gap G1 between the enlarged diameter surface 15 and the inclined surface 21 is applied to the back pressure valve 17. The loss varies with the height of the compression coil spring 18 which is changed by the pressure. That is, the back pressure valve 17 is provided with an elastic force in the direction of reducing the width of the cake discharge passage 27.

In other words, the width (cross-sectional area orthogonal to the axial direction of the cake discharge passage 27) of the cake discharge passage 27 is varied according to the pressure of the dewatered cake applied to the back pressure valve 17. The back pressure valve 17 functions as a valve body which can adjust the width in the axial direction of the cake discharge passage 27.

In addition, the member which connects the back pressure valve 17 and the end wall 19 is not limited to the compression coil spring 18, but the elastic force in the direction which reduces the width | variety of the cake discharge passage 27 with respect to the back pressure valve 17. As shown in FIG. Can be given. For example, it may be a material having elasticity such as a leaf spring or an elastomer.

Returning to FIG. 1, the feed pipe 3 is a pipe for supplying water to the rotating body 2. The feed pipe 3 is a hollow pipe member having both ends opened, and is inserted into the inner rotational rotation shaft 16 of the inner motion screw 22 from the supply side end of the rotational body 2, and the first of the feed pipe 3. The end reaches the feed zone 24 of the rotary cylinder 23. On the other hand, the 2nd end part on the opposite side to the 1st end part of the feed pipe 3 which protruded from the supply side end part of the rotating body 2 is supported by the support unit 5.

The casing 4 accommodates the external bowl 8 and recovers the dewatered cake and the separation liquid discharged from the external bowl 8. The casing 4 is a hollow casing, and a separation liquid chute 28 for discharging the separation liquid recovered from the outer bowl 8 to the outside is formed at the supply side end thereof. At the discharge side end of the casing 4, a cake chute 29 for discharging the dewatered cake recovered from the outer bowl 8 is formed.

The support unit 5 is a unit which rotatably supports the rotating body 2 at the both ends of the longitudinal direction (axial direction). The support unit 5 is comprised from the supply side support unit 30 which supports the supply side edge part of the rotating body 2, and the discharge side support unit 31 which supports the discharge side edge part of the rotating body 2. As shown in FIG.

The drive unit 6 is a unit that rotationally drives the external balls 8 and the internal screws 22 constituting the rotating body 2 at different speeds. This drive unit 6 rotates the motor 32 as a drive source, the belt transmission mechanism 33 which transmits the rotational driving force of this motor 32 to the external ball 8, and the internal-drive screw 22 The hydraulic vehicle speed device 34 is provided. The operation of the motor 32 is controlled by a control device (not shown).

By controlling the vehicle speed of the rotational speeds of the external drive ball 8 and the internal drive screw 22, by depositing the water content inside the external drive ball 8, the centrifugal effect can be imparted to the water content over a longer time. Thereby, the water content of the water can be further reduced.

Moreover, in this embodiment, although the control which keeps the rotational torque of the internal dynamic screw 22 constant was implemented, instead, it maintains the vehicle speed of the rotational speed of the external dynamic ball 8 and the internal dynamic screw 22 constant. You may control.

In the linear centrifugal dewatering device 1 constituted as described above, in the state where the externally driven ball 8 and the internally driven screw 22 are rotationally driven at different rotational speeds by the drive unit 6, a function such as sludge may be used. Water is supplied to the feed zone 24 of the rotary motion through the feed pipe 3. Then, the water is moved by the centrifugal force from the feed zone 24 to the external ball 8 through the feed hole 26.

Thereafter, the water-containing water is conveyed from the supply side to the discharge side by the vane member 25 of the internal motion screw 22 by the vehicle speed of the external motion ball 8 and the internal motion screw 22, It is separated into water and dewatered cake. The separation water passes through the separation liquid discharge hole 11 and is discharged from the separation liquid chute 28 to the outside of the apparatus.

The dehydration cake is subjected to a pressing force (back pressure) attributable to the discharge resistance in the axial direction by the back pressure valve 17 in the process of being conveyed and discharged. In other words, resistance is imparted to the dewatering cake conveyed from the supply side to the discharge side by the vane member 25 of the inner movable screw 22 by hitting the back pressure valve 17 and pressing the back pressure valve 17.

As the water content of the dewatering cake is lowered, the pressing force of the dewatering cake due to the driving force of the inner copper screw 22 is increased. When the pressing force of the dewatering cake is larger than the discharge resistance by the compression coil spring 18, the compression coil spring 18 supporting the back pressure valve 17 is contracted, and the height of the compression coil spring 18 is lowered, resulting in a cake discharge passage. 27 is formed. That is, from the state in which the back pressure valve 17 as shown in FIG. 3 is closed and the diameter expansion surface 15 and the inclined surface 21 are in surface contact, the cake discharge passage 27 shown in FIG. 2 is formed. In this way, the dewatered cake passes through the cake discharge hole 12 through the cake discharge passage 27 and is discharged from the cake chute 29 to the outside of the apparatus.

Here, the spring constant and the number of the compression coil springs 18 are demonstrated.

The spring constant and the number of compression coil springs 18 are determined based on the specifications of the centrifugal dewatering device 1. For example, when the throughput per hour of the centrifugal dehydration apparatus 1 is 50 m <3>, it is determined based on the pressure of the dehydration cake at the time of rated operation during the process of the water content of this throughput.

Specifically, at rated operation, the gap G1 between the enlarged diameter surface 15 and the inclined surface 21 is 1/3 of the distance G2 between the inner circumferential surface of the ball body 9 and the outer circumferential surface of the rotary motion 23. The spring constant and number of degrees (hereinafter referred to as standard spacing) are selected.

That is, the spring constant and the number of springs of the compression coil spring 18 are the elastic force of the whole of the several compression coil springs 18, and the pressure of the dehydration cake at the time of rated operation is the cake discharge path 27 is standard. It is chosen to be balanced at intervals.

Here, when the water content of the dewatered cake is further lowered, the pressing force of the dewatered cake is further increased, and the interval G1 is larger than the standard interval so that the area of the cake discharge passage 27 increases. As the area of the cake discharge passage 27 increases, more dehydrated cake is discharged, and the residence time of the dehydrated cake is shortened. Thereby, it returns to the original state from the low water content of a dehydration cake.

In addition, when the water content of the dewatered cake increases, the pressing force of the dewatered cake decreases, the interval G1 becomes smaller than the standard interval, and the area of the cake discharge passage 27 decreases. As the area of the cake discharge passage 27 decreases, the discharge of the dehydrated cake also decreases, and the residence time of the dehydrated cake becomes long. Thereby, it returns to the original from the state with high water content of a dehydration cake.

That is, the residence time according to the moisture content of the dehydrated cake is obtained, and the variation of the moisture content of the dehydrated cake is minimized.

Moreover, when fiber powder or crystal | crystallization is contained in a water content, fiber powder or crystal | crystallization may adhere to the cake discharge path 27. In this case, the area of the cake discharge passage 27 temporarily decreases, the discharge resistance increases, and thus the internal pressure increases, and the force for pressing the back pressure valve 17 increases. At this time, as shown in FIG. 4, the back pressure valve 17 retreats to a discharge side according to the magnitude | size of the increased force, and the area of the cake discharge passage 27 becomes large. That is, the width | variety of the cake discharge path 27 becomes wider because the space | interval G1 of the enlarged diameter surface 15 and the inclined surface 21 becomes wider than a standard space | interval. Thereby, the fiber powder and crystal | crystallization adhering to the cake discharge path 27 are removed.

When the deposit is removed, by the elastic force of the compression coil spring 18, the area of the cake discharge passage 27 returns to the standard interval.

According to the above embodiment, even when fibers or crystals are attached to the cake discharge passage 27, the back pressure valve 17 that determines the width of the cake discharge passage 27 widens the cake discharge passage 27. By moving, the fiber powder and crystal | crystallization adhering to the cake discharge path 27 can be removed. That is, when the cake discharge passage 27 is narrowed by adhesion, and the discharge pressure rises, the back pressure valve 17 moves, the width | variety of the cake discharge passage 27 becomes wide, and when a dehydration cake is discharged | emitted by removing a deposit, Occlusion can be prevented.

In addition, the area of the cake discharge passage 27 increases due to an increase in the pressure force accompanying the decrease in the moisture content of the dehydrated cake, and the residence time of the dehydrated cake is shortened. In addition, the area of the cake discharge passage 27 decreases due to the decrease in the pressing pressure accompanying the increase in the moisture content of the dehydrated cake, and the residence time of the dehydrated cake becomes long. Thereby, it becomes the residence time according to the moisture content of a dehydration cake, and can fluctuate the fluctuation | variation of the moisture content of a dehydration cake.

In addition, the water content of the dewatered cake can be adjusted by adjusting the spring constant and initial length of the compression coil spring 18 (it can be arbitrarily selected whether the spring state at the time of assembly is a natural length or the compression side).

(Modification of 1st Embodiment)

Next, the centrifugal dehydration apparatus of the modification of 1st Embodiment is demonstrated. As shown in FIG. 5, the back pressure valve 17 of the centrifugal dewatering apparatus of the modification of 1st Embodiment is supported by the actuator 36. As shown in FIG. That is, the back pressure valve 17 and the end wall 19 of the ball main body 9 are connected by the actuator 36. The actuator 36 is a drive device that can change the position in the axial direction of the back pressure valve 17 to an arbitrary position.

The actuator 36 may employ a hydraulic cylinder, for example. Moreover, the back pressure valve 17 is provided with the pressure gauge (not shown) which can detect the pressure of the dehydration cake added to the back pressure valve 17. As shown in FIG. The stroke of the actuator 36 is controlled by a control device (not shown) in accordance with the pressure measured by the pressure gauge.

Next, the control method of the actuator 36 of this modification is demonstrated.

The control apparatus memorize | stores the pressure pressure (henceforth a standard pressure) of the dehydration cake at the time of rated operation. When the pressure measured by the pressure gauge was a standard pressure, the control apparatus checks the back pressure valve 17 so that the space | interval G1 (width of the cake discharge path 27) of the diameter-expansion surface 15 and the inclination surface 21 becomes a standard space | interval. ) Position.

If the measured pressure is lower than the standard pressure, the gap G1 is made narrower than the standard gap. On the other hand, when the pressure is larger than the standard interval, the interval G1 is made wider than the standard interval. Thereby, the residence time of a dehydrated cake becomes according to a moisture content, and the fluctuation of the moisture content of a dehydrated cake is minimized.

Also, even when fibers or crystals are attached to the cake discharge passage 27, the gap is widened by increasing the pressing force of the dehydrated cake, so that the fibers or crystals attached to the cake discharge passage 27 can be removed. Can be. That is, the blockage at the time of discharging the dehydrated cake can be prevented.

(2nd embodiment)

EMBODIMENT OF THE INVENTION Hereinafter, the centrifugal dewatering apparatus of 2nd Embodiment of this invention is demonstrated based on drawing. In addition, in this embodiment, it centers around difference with 1st embodiment mentioned above, and abbreviate | omits the description about the same part.

As shown in FIG. 6, the centrifugal dewatering apparatus 1B of this embodiment is called what is called a decanter type | mold, and the shape of the external ball 8 etc. compared with the linear centrifugal dehydration apparatus 1 of 1st Embodiment. , The discharge structure of the dewatered cake is different.

Specifically, the ball main body 9 of the external ball 8 of this embodiment has the cylindrical linear motion part 40 and the truncated-cone tapered part 41. As shown in FIG. In addition, the back pressure valve 17 (refer FIG. 1) is not formed in the discharge side of the ball main body 9. As shown in FIG. In addition, the end wall 19 (refer FIG. 1) of the discharge side of the ball main body 9 is not formed. The cake discharge hole 42 on the discharge side of the present embodiment is a circular cake discharge hole 42 formed by an end portion on the discharge side of the tapered portion 41. This cake discharge hole 42 is a little smaller than the flow path area of the linear body 40 of the ball main body 9.

In the taper part 41 of the ball main body 9 of this embodiment, the some guide vane 43 (pin) is formed in the circumferential direction at equal intervals. Each guide vane 43 is a plate-shaped member projecting from the inner circumferential surface of the tapered portion 41 to the radially inner circumferential side.

As shown in FIG. 7, the guide vane 43 has a rectangular shape in the shape viewed from the circumferential direction, and is formed of the blade short side 44 and the blade short side 44 formed in parallel with the outer circumferential surface of the rotary motion 23. The first end and the first end of the tapered portion 41 are connected to each other, and a shear edge 45 extending along a surface orthogonal to the central axis O and a first side opposite to the first end of the blade short side 44. The 2nd end part and the 1st end part of the taper part 41 have the rear end side 46 which connects the 2nd end part of the opposite side, and extends along the surface orthogonal to the center axis | shaft O. As shown in FIG. The guide vane 43 and the taper part 41 are connected via the connection edge 47 which connects the outer peripheral end of the front edge 45 of the guide blade 43 and the outer peripheral end of the rear edge 46. The guide vane 43 is formed so that the blade short side 44 may approach the rotary cylinder 23 as much as possible in the range which does not contact the rotary cylinder 23.

The guide vane 43 is not disposed on the same plane as the plane including the central axis O, and is formed to be inclined with respect to the propulsion direction of the dewatering cake. That is, the plurality of guide vanes 43 are formed such that the dewatered cake collides with the guide vanes 43 with the movement in the propulsion direction of the dewatered cake conveyed by the wing member 25 of the inner movable screw 22. It is.

FIG. 8 is a developed view of the truncated tapered portion 41 of the ball body 9 showing the position of the connecting edge 47 of the guide vane 43. In FIG. 8, the code | symbol 41a is the edge part of the axial direction supply side of the taper part 41, and the code | symbol 41b is the edge part of the axial discharge side of the taper part 41. In FIG. As shown in FIG. 8, the connecting edge 47 of the guide vane 43 is not parallel to the central axis O in the radial direction, but is inclined with respect to the central axis O in the radial direction.

Moreover, the space | interval of guide vanes 43 comrades is formed so that it may become larger than 1/3 of the space | interval G2 of the inner peripheral surface of the ball main body 9, and the outer peripheral surface of the rotary motion 23 even in the narrowest place. In other words, the minimum spatial dimension of the neighboring guide vanes 43 is larger than 1/3 of the distance G2 between the inner circumferential surface of the ball body 9 and the outer circumferential surface of the rotary motion 23.

In the decanter-type centrifugal dewatering device 1B configured as described above, the dewatering cake collides with the guide vanes 43 in the process of being carried out, and the dewatering cake generates discharge resistance, which can impart a pressing force to the dewatering cake. . On the other hand, since the cake discharge hole 42 is a little smaller than the flow path area of the linear motion part 40 of the ball main body 9, the blockage in the cake discharge hole 42 does not occur easily.

Moreover, the moisture content of a dewatering cake can be adjusted by changing the arrangement | positioning angle (alpha) of the guide vane 43 with respect to the flow direction D of a dewatering cake. That is, the residence time of the dehydrated cake can be adjusted by increasing the placement angle α to increase the resistance to the dewatered cake or by reducing the placement angle α to reduce the resistance to the dehydrated cake.

As mentioned above, although embodiment of this invention was described in detail with reference to drawings, each structure in each embodiment, its combination, etc. are an example, The addition of a structure and abbreviate | omitted within the range which does not deviate from the meaning of this invention. , Substitutions, and other changes are possible. In addition, this invention is not limited by embodiment and limited by only the range of a claim.

Industrial availability

According to this centrifugal dewatering apparatus, even when fiber powder or crystal adheres to the discharge passage, the fiber powder or crystal adhered to the discharge passage can be removed by moving the valve body which can adjust the width of the discharge passage. That is, the discharge passage is narrowed by the attachment, and the discharge pressure rises, the valve body moves, the width of the discharge passage is widened, and the obstruction at the time of discharging the water can be prevented by removing the deposit. In addition, the discharge resistance can be imparted to the water by narrowing the width of the discharge passage. In addition, the water content can also be adjusted by adjusting the width of the discharge passage.

1, 1B: centrifugal dewatering device
2: rotating body
3: feed pipe
4: casing
5: support unit
6: drive unit
8: single ball
9: ball body
10: external rotating shaft
11: separation liquid discharge hole
12: cake outlet
13: stone
14: mirror surface
15: diameter expansion surface (valve seat surface)
16: internal rotation axis
17: back pressure valve (valve body)
18: compression coil spring
19: end wall
20: through hole
21: slope
22: dynamic screw
23: rotating copper
24: Feed Zone
25: wing member
26: supply hole
27: cake discharge passage (discharge passage)
28: separation liquid chute
29: Cake Suit
32: motor
33: belt transmission mechanism
34: vehicle speed device
36: Actuator
40: direct motion
41: taper part
42: cake discharge hole (function discharge hole)
43: guide wings
44: wings short side
45: shear edge
46: trailing edge
47: connection side
F: mounting surface
G1, G2: interval
O: central axis

Claims (6)

And a cylindrical external ball to which the water is supplied, and a wing member protruding from the circumferential surface of the rotary motion through which the external ball is inserted, and an internal dynamic screw for propelling the water in the axial direction. A rotating body dehydrated using centrifugal force while being conveyed,
A plurality of guide vanes disposed to be inclined with respect to the propulsion direction of the water and narrowed with each other toward downstream;
It is formed in one end of the forward direction of the external ball in the propulsion direction, and has a water discharge hole for discharging the water-containing water compressed by the plurality of guide vanes,
The said externally-actuated ball | bowl has a cylindrical linear motion part and a tapered part of a truncated conical shape, and the taper part which makes the flow path area of the said water content small as it goes to the propulsion direction of the said water content,
The plurality of guide vanes are formed to protrude from the tapered portion to the inner circumferential side,
The plurality of guide vanes are formed in the circumferential direction of the tapered portion at equal intervals. delete delete delete delete delete

Images