TWI665017B - Centrifugal dehydration apparatus - Google Patents

Abstract

A centrifugal dehydration device is provided, which comprises: a rotating body (2) having an outer carcass support cup (8) and an inner carcass screw provided with a fan blade member; and a valve body (17) so that The width of the discharge passage (27) is adjusted so as to be provided; and a group of disc springs (18) are provided with elastic force to the valve body in a direction that decreases the width of the discharge passage (27); and The cylindrical support body (20) is arranged to support a group of disk springs (18) on the opposite side of the valve body in the axial direction. The valve body (17) is provided with The conical portion (45) and the cylindrical portion (46), a group of disc springs (18), are each provided with a plurality of circular disc springs (37) each having a diameter-enlarged portion around the cylindrical portion. (46) A method of being inserted into the inner peripheral side of the enlarged diameter part, the other end of the axial direction of one group is connected to the conical part (45), and one end of the axial direction of one group is connected to the support body (20), It is arranged, and a disk-shaped spring (37) at one end connects the side of the diameter-expanded part facing one of the axial directions with the support (20), and the support (20) and the disk-shaped elastic (37) wherein the end of the contact places, which is a cross-sectional shape along the axis line direction of a semicircular shape.

Description

Centrifugal dewatering device

The present invention relates to a centrifugal dehydration device. This application claims priority based on Japanese Patent Application No. 2017-186469 filed in Japan on September 27, 2017, and the contents thereof are incorporated herein.

As a centrifugal dehydration device that uses centrifugal force to separate solids and liquids, it is known to apply centrifugal force and rotate solids and liquids by the rotation of the outer carcass support cup, and the weight including the solid amount and the liquid amount is performed by the inner carcass screw. Ingredients (such as dehydrated cake) are transported and discharged in the machine.此种 In this kind of centrifugal dehydration device, the dehydration of dehydrated cakes and the like is promoted simultaneously with the solid-liquid separation by the pressing force of the centrifugal force and the pressing force of the discharge resistance. In the dehydration caused 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 discharge opening has a narrow structure, so that the dewatering cake discharged from the discharge opening is given a compacting effect (for example, refer to Patent Document 1).

Patent Document 1 discloses a mechanism for applying a back pressure to the dehydrated cake at the discharge port. The back pressure is applied by a member such as a back pressure adjusting body having a tapered front end and a spring that presses the back pressure adjusting body. [Prior Art Literature] [Patent Literature]

[Patent Document 1] Japanese Patent Laid-Open No. 2001-29842

[Problems to be Solved by the Invention]

In addition, in Patent Document 1, members such as a spring that presses the back pressure adjusting body are not specifically disclosed. In addition, the installation of components such as springs may enumerate the possibility of several problems. However, if the structure is not based on the specific structure (type of spring and installation method, etc.), The clarification of the countermeasures may hinder the normal operation of the back pressure regulator or cause errors in the setting of the back pressure, and may adversely affect the stable operation of the device and the reduction of the water content.

An object of the present invention is to provide a centrifugal dehydration device that can easily adjust the back pressure applied to the dehydrated cake and can stably apply the back pressure to the dehydrated cake. [Means to solve the problem]

According to the first aspect of the present invention, it is a centrifugal dehydration device, which is characterized by comprising: a rotating body, a cylindrical outer bowl receiving bowl to which water is supplied, and A fan blade member is protrudingly provided on the peripheral surface of the rotating carcass housed in the outer carcass receiving cup, and the inner carcass screw is pushed toward one side of the axial direction of the inner carcass screw, and the centrifugal force is used while carrying the water And the valve body is arranged coaxially with the rotating body, and has a width in the axial direction of the water-containing material discharge path formed at one end of the axial direction of the outer body support cup The web is adjusted in a manner of adjusting the width; and a group of disc springs are arranged coaxially with the rotating body, and give elastic force to the valve body in a direction to reduce the wide width; and a cylindrical shape The supporting body is arranged coaxially with the rotating body, and is arranged so as to support the opposite side of the valve body of the group of disk springs in the axial direction from the valve body. Is provided with a conical portion that expands in diameter as it goes to one of the axial directions, and a circle that is smaller than the maximum diameter of the conical portion and is connected to one of the conical portions in one axial direction. The cylindrical part, the aforementioned group of disc springs, are provided with a plurality of circular disc springs having a plurality of diameter-enlarged portions that expand in diameter as they are directed in the axial direction, so that the cylindrical portion is inserted in The inner peripheral side of the enlarged diameter portion, the other end in the axial direction of the one group is connected to the conical portion, and one end in the axial direction of the one group is connected to the support, and is configured, and one end of the one The disc spring is such that the side of the enlarged diameter portion facing one of the axial directions is in contact with the support, and where the support is in contact with one of the ends, the section along the axial direction The shape is semicircular.

According to this configuration, a group of disk springs can be used to impart elastic force to the valve body. In addition, by increasing or decreasing the number of disc springs, the elastic force applied to the valve body can be easily changed. Furthermore, since the place where the support body is in contact with the disc spring is formed in a semicircular shape, the contact angle at the place where the disc spring is in contact with the support body is caused by the expansion and contraction of the disc spring. With the change, the friction coefficient and contact area also become constant. As a result, the compression force of the disc spring is stably transmitted, and the deformation operation of the disc spring can be made smooth.

It can be set as follows: that is, a group of disk springs includes a plurality of cells including a plurality of disk springs as a group, and a plurality of cells are arranged in series in the axial direction. And constitute it.

It can be set as follows. That is, a group of disk springs composed of a plurality of units includes a unit that contacts the front surface or the back surface of the disk spring with each other.

According to such a configuration, the number of disk springs required for a group of disk springs can be reduced.

The centrifugal dehydration device can be configured as follows: the centrifugal dehydration device further includes a to-be-slided cylinder connected to the outer carcass receiving cup, and a rotating carcass being inserted on the inner peripheral side, The support is fixed to the cylinder to be slid, and the cylinder to be slid is inserted into the inner peripheral side of the cylindrical portion of the valve body via the sleeve.

According to this structure, the valve body and the to-be-slided cylinder can be made to slide smoothly by sliding the valve body arrange | positioned through the sleeve at the outer peripheral side of the to-be-slided cylinder.

In the centrifugal dehydration device, the outer carcass support cup, the sliding cylinder, the valve body, the support body, and a group of disc springs may be rotated at a first speed, and the carcass may be rotated at a second speed. Rotation, the first speed is faster than the second speed. [Effect of the invention]

According to the present invention, since a group of disk springs are used to impart elastic force to the valve body, the elasticity imparted to the valve body can be easily increased or decreased by increasing or decreasing the number of disk springs. Force changes. In addition, since the place where the support and the disc spring are in contact is formed in a semicircular shape, even if the contact angle between the disc spring and the support changes due to the expansion and contraction of the disc spring, friction occurs. The coefficient and contact area also become constant. As a result, the compression force of the disc spring is stably transmitted, and the deformation operation of the disc spring can be made smooth.

Hereinafter, the centrifugal dewatering device 1 according to the embodiment of the present invention will be described in detail with reference to the drawings. As shown in FIG. 1, the centrifugal dewatering device 1 is called a so-called straight body type, and is provided with a rotating body 2 in which the inside is formed in a hollow shape and extends in the axial direction D, and A feed pipe 3 inserted into the inner portion of the rotating body 2 on the other side D2 from the axial direction thereof, a housing 4 accommodating the rotating body 2, and both ends provided in the axial direction D of the rotating body 2 A pair of supporting units 5 and a driving unit 6 for rotationally driving the rotating body 2.

The rotating body 2 is a water-containing substance such as sludge that is supplied to the inside, and is dehydrated by centrifugal force while being conveyed while being separated into a dehydrated cake and a separation liquid. The rotating body 2 is provided with a hollow cylindrical outer carcass cup 8 and an inner carcass screw 22 which is housed inside the outer carcass cup 8 and advances water content toward one side D1 in the axial direction. The centrifugal dehydration device 1 separates the water content introduced from the other side D2 (supply side) of the axial direction through the feed pipe 3 into solid-liquid, and dehydrates the cake from one of the axial directions of the outer carcass support cup 8 The water content on the side D1 is discharged in the front side (discharge side).

Water is supplied to the inside of the outer carcass support cup 8. The outer body cup 8 is provided with a cup body 9 having a hollow hollow frame body, and a hollow body provided from both ends of the cup body 9 in the axial direction D and protruding toward both sides. Outer carcass rotation axis 10. A separation liquid discharge hole 11 is provided at an end portion D2 on the other side in the axial direction of the cup body 9 to discharge the separation liquid separated from the water. A cake discharge hole 12 is provided at an end of one side D1 of the cup body 9 in the axial direction of the cup body 9 to discharge the dehydrated cake separated from the water content.

A protrusion 13 extending in the circumferential direction of the cup receiving body 9 is formed at the inner peripheral surface of the cup receiving body 9 and adjacent to the cake discharge hole 12. As shown in FIG. 2, the ridge 13 is provided so that the cross-sectional shape viewed from the circumferential direction becomes as narrow as the inner diameter of the cup body 9 as it goes toward one side D1 in the axial direction. The conical truncated cone-shaped reduced diameter surface 14 is connected to the reduced truncated surface 14 and becomes the general truncated cone-shaped enlarged diameter surface as the inner diameter of the cup body 9 increases as it goes toward one of the axial directions D1. 15 (valve seat surface). In other words, the shape of the reduced diameter surface 14 and the enlarged diameter surface 15 of the ridge 13 as viewed from the circumferential direction is a triangular shape that matches one side with the inner peripheral surface of the cup body 9.

As shown in FIG. 1, the outer carcass support cup 8 is arranged in such a manner that the outer carcass rotation axis 10 extends in a horizontal direction, and both ends of the outer carcass support 8 are supported by a support unit. 5 is supported from below to be rotatable around the shaft so that the cup body 9 is held at a specific height position from the installation surface F.

The inner carcass screw 22 is transported toward the discharge side while agitating the water content inside the outer carcass support cup 8. The inner carcass screw 22 is provided with a slightly cylindrical rotating carcass 23 formed at a central portion of the axial direction D with a slightly large diameter feed area 24, and a radial direction projecting from the peripheral surface of the rotating carcass 23 and The fan blade member 25 extending in a spiral shape in the axial direction D. At the rotating carcass 23, a supply hole 26 is formed so as to communicate with the outer carcass cup 8 and the feeding region 24. The corpus callosum screw 22 is housed inside the corpus callosum cup 8. The inner carcass rotation shafts 16 protruding from both ends of the inner carcass screw 22 in the axial direction D are respectively inserted into the outer carcass rotation shaft 10 inside the outer carcass support cup 8. The other side D2 of the inner corpus callosum rotation axis 16 has a hollow structure. The pitch of the fan blade member 25 in the axial direction D can be arbitrarily changed. For example, the pitch can be set to a certain pitch or a gradually decreasing pitch.

As shown in FIG. 2, the centrifugal dewatering device 1 is provided with a valve body 17 which is arranged coaxially with the rotating body 2 and is provided so as to be movable in the axial direction D, and is coaxial with the rotating body 2. The disk springs 18 are arranged on the ground and a group of springs is applied to the valve body 17 toward the other side D2 in the axial direction, and the disk springs 18 are arranged coaxially with the rotating body 2 and arranged in the axial direction D. A cylindrical support body 20 supporting the valve body 17 on the opposite side, a valve body 17, a group of disk springs 18, and a slidable tube 36 supporting the support body 20 from the inside in the radial direction. A group of coil springs 18 includes a plurality of coil springs 37 in combination with a specific number (four in this embodiment) as a group of units 35 arranged in series in the axial direction D in plural. The plural unit 35 constitutes it. Therefore, a group of the disc springs 18 may be constituted only by the same combination of units, and may also be constituted by a unit including a plurality of mutually different combinations.

The to-be-rolled cylinder 36 is a member which is arranged on the outer peripheral side of the inner body rotation shaft 16 and which supports the valve body 17 slidably in the axial direction D. The to-be-slung cylinder 36, the valve body 17, the group of disk springs 18, and the support body 20 are rotated at the same rotation speed as the outer body cup 8.

As shown in FIG. 3, each of the disc springs 37 is a circular donut-shaped disc spring provided with a plurality of diameter-enlarged portions 38 that increase in diameter as it goes toward the axial direction D. . In other words, the disc spring 37 has a conical shape with a disc perforated in the center, and the enlarged diameter portion 38 corresponds to the conical portion. The inner diameter d of the disc spring 37 is slightly larger than the outer diameter of the cylindrical portion 46 of the valve body 17 described later.

The slide tube 36 is connected to the outer body support cup 8 and rotates with the outer body support cup 8. As shown in FIG. 2, the to-be-rolled cylinder 36 is provided with a to-be-rolled cylinder body 39 formed in a cylindrical shape coaxial with the rotating body 2 and one side of the to-be-rolled cylinder body 39 in the axial direction. The flange portion 40 is formed at D1 so as to protrude outward in the radial direction and is fixed to the end wall 19 of the outer carcass support cup 8. The flange portion 40 can be fixed to the end wall 19 by, for example, a screw 41. The quilt-closing cylinder 36 is arranged on the outer side of the inner corpuscle rotating shaft 16 in the radial direction with the oil seal member 42 interposed therebetween. The to-be-slung cylinder 36 and the rotary carcass 23 can be rotated by different rotation numbers.

The support body 20 is fixed to the outer peripheral surface 36 a of the to-be-rolled cylinder 36. The support 20 includes a base portion 43 extending in the circumferential direction, and a support body 44 provided at the other side D2 in the axial direction of the base portion 43. The cymbal base portion 43 is formed in a ring shape, and an inner peripheral surface facing the inner peripheral side in the radial direction is fixed to the outer peripheral surface 36 a of the to-be-rolled cylinder 36.

The support body 44 has a cylindrical shape and is arranged coaxially with the rotating body 2. The end portion of one side D1 of the support body 44 in the axial direction is fixed to the surface of the pedestal portion 43 on the other side D2 of the axial direction covering the circumferential direction. The end portion D2 on the other side in the axial direction of the support body 44 is a place where one end D1 on one side in the axial direction of the group of disk springs 18 is supported. The support body 20 is formed such that the diameter of the support body 44 becomes approximately 1/2 of the sum of the inner diameter and the outer diameter of the disc spring 37. That is, the support body 20 is formed so that the end of the other side D2 of the support body 44 in the axial direction will support the center near the radial direction of the enlarged diameter portion 38 of the disc spring 37 in the radial direction. Where the support body 44 is in contact with a group of disc springs 18, the cross-sectional shape including the axis O is semicircular. That is, the cross-section viewed from the peripheral direction of the edge portion D2 on the other side of the axial direction of the cylindrical support body 44 which is a cylindrical shape is formed by the outer peripheral surface of the support body 44 and the inside of the support body 44. A peripheral surface and an arc surface that smoothly connects the outer peripheral surface of the support body 44 and the inner peripheral surface of the support body 44 smoothly.

The valve body 17 is provided with a conical portion 45 that expands in diameter as it goes toward one side D1 in the axial direction, and an outer diameter that is smaller than the maximum diameter of the conical portion 45 and is one side of the conical portion 45 in the axial direction D1 is a connected cylindrical portion 46. The conical portion 45 includes an inclined surface 21 that is a surface facing the other side D2 in the axial direction, and a vertical surface that is orthogonal to the axis O toward the one side D1 in the axial direction. The diameter of the inclined surface 21 of the conical portion 45 is increased as it goes toward one side D1 in the axial direction. The angle of the inclined surface 21 is equal to the angle of the enlarged diameter surface 15 of the protrusion 13 of the cup body 9. That is, the conical portion 45 of the valve body 17 is formed so that the inclined surface 21 and the enlarged diameter surface 15 come into surface contact by moving the valve body 17 toward the other side D2 in the axial direction. Accordingly, the enlarged diameter surface 15 functions as a valve seat surface of the valve body 17. The vertical surface of the conical portion 45 functions as a receiving surface for transmitting the elastic force of a group of coil springs 18 as a back pressure.

A sleeve 47 is fixed to the inner peripheral surface of the cylindrical portion 46. The sleeve 47 facilitates sliding between the cylindrical portion 46 of the valve body 17 and the sliding tube 36. The sleeve 47 is formed of, for example, a material suitable for a plain bearing such as copper and having good abrasion characteristics. A sealing member 48 is provided at the inner peripheral surface of the conical portion 45 to seal between the inner peripheral surface of the conical portion 45 and the outer peripheral surface of the sliding cylinder 36. As the sealing member 48, for example, an O-ring can be used.

A cake discharge path 27 is formed between the enlarged diameter surface 15 of the cup main body 9 and the conical portion 45 of the valve body 17 so as to squeeze the dehydrated cake toward the cake discharge hole 12. By using a group of disk springs 18 to exert a pressing force on the valve body 17, the interval G1 between the enlarged diameter surface 15 and the inclined surface 21 of the conical portion 45 depends on the pressure applied to the valve body 17. The thickness of each group of the disc springs 18 is changed. The valve body 17 is provided with an elastic force in a direction in which the width of the cake discharge passage 27 is reduced. In other words, the breadth of the cake discharge passage 27 (the cross-sectional area of the cake discharge passage 27 orthogonal to the axial direction D) varies depending on the pressure of the dehydrated cake applied to the valve body 17. The width of the cake discharge passage 27 in the axial direction D is adjusted by sliding the valve body 17 on the to-be-slided cylinder 36 in the axial direction D.

As shown in FIG. 1, the feed pipe 3 is for supplying water to the rotating body 2. The feed tube 3 is a hollow tube member having two openings at both ends, and is inserted into the inner carcass rotation shaft 16 from the inner carcass screw 22 from the end of the other side D2 in the axial direction of the rotary body 2. One of the ends reaches the feeding area 24 of the rotary carcass 23. On the other hand, the other end of the feed pipe 3 protruding from the end of the other side D2 on the other side in the axial direction of the rotating body 2 is supported by the support unit 5.

The casing 4 is a receiver for receiving the dehydrated cake 8 and the dehydrated cake and the separation liquid discharged from the outer cake holder 8. The casing 4 is a hollow frame. At the end of D2 on the other side in the axial direction of the casing 4, the casing 4 is provided to discharge the separation liquid recovered from the outer casing 8 to the outside for separation.液 斜槽 28。 Liquid chute 28. A cake chute 29 is provided at an end of one of the sides D1 in the axial direction of the casing 4 to discharge the dehydrated cake recovered from the outer carcass support cup 8.

The support unit 5 is a unit for rotatably supporting the rotating body 2 at both ends in the axial direction D. The support unit 5 is supported by a supply-side support unit 30 that supports the end portion D2 on the other side in the axial direction of the rotating body 2 and a discharge-side support that supports the end portion D1 on one side in the axial direction of the rotating body 2 Unit 31, and is constituted.

The driving unit 6 is a driver for rotating the outer carcass support cup 8 and the inner carcass screw 22 constituting the rotating body 2 at different speeds. The driving unit 6 is provided with a motor 32 as a driving source, a belt transmission mechanism 33 that transmits the rotational driving force of the motor 32 to the outer casing 8 and an oil pressure type that rotationally drives the inner casing screw 22. Differential device 34. The operation of the motor 32 is controlled by a control device (not shown).

If the water content is accumulated inside the outer body cup 8 by controlling the difference in the number of rotations of the outer body cup 8 and the inner body screw 22, it is possible to cover the water content for a longer period of time. Since it has a centrifugal effect, it is possible to further reduce the water content of the water. In the centrifugal dehydration device 1 of this embodiment, the outer carcass support cup 8, the sliding cylinder 36, the valve body 17, the support body 20, and a group of disc springs 18 rotate at a first speed, and the rotating carcass 23 rotates at a first speed. 2 speed while rotating. The first speed is faster than the aforementioned second speed.

In addition, in this embodiment, although the control is performed to keep the rotation torque of the inner carcass screw 22 constant, the number of rotations of the outer carcass support cup 8 and the inner carcass screw 22 may be replaced instead. The differential speed is maintained at a certain control.

Next, a combination of a group of coil springs 18 will be described. A group of coil springs 18 can obtain various load characteristics according to the combination. A group of disk springs 18 is a unit 35 in which a specific number of disk springs 37 are used as a group, and plural units are arranged in the axial direction D. The specific number is described here as four. However, the number can be changed according to the design, and it can also be two, three, or five or more. As shown in FIG. 4, the unit 35 can be combined in various forms. In addition, the units with the same configuration (units of the same kind) can be plurally arranged, and the units with different configurations (units of different kinds) can be mixed and plurally arranged. For example, only the second unit 35B of FIG. 4 (b) can be combined into a complex array, and only a group of disc springs 18 can be formed by the same type of unit. The first unit 35A of FIG. 4 (a) can also be combined. A plurality of different types of units from the second unit 35B of FIG. 4 (b) are combined to form a plurality of coil springs 18.

As shown in FIG. 4 (a), the first unit 35A is a unit in which a pair of disc springs 37 that make the back surfaces 37b of the disc springs 37 contact each other are arranged in series in the axial direction D .

As shown in FIG. 4 (b), the second unit 35B is a unit in which a pair of disc springs 37 that make the surfaces 37a of the disc springs 37 contact each other are arranged in series in the axial direction D. .

As shown in FIG. 4 (c), the third unit 35C is provided on both sides of the two disc springs 37 that make the back surfaces 37b contact each other, so that the front surfaces 37a and the back surfaces 37b are in contact with each other. In this way, the disc spring 37 is used as an overlapping unit.

As shown in FIG. 4 (d), the fourth unit 35D is provided on both sides of the two disc springs 37 that contact the surfaces 37a with each other, and further contacts the surfaces 37a and the back surfaces 37b. By the way, the disc spring 37 is an overlapping unit 35.

As shown in FIG. 4 (e), the fifth unit 35E is a unit 35 in which four disc springs 37 are overlapped in the same direction.

The above-mentioned units 35A to 35E can be appropriately selected according to the required load characteristics and the distance between the support 20 and the conical portion 45 of the valve body 17. For example, it is possible to set the disks required in a group of the disk springs 18 by making the surfaces 37a of the disk springs 37 or the back surfaces 37b contact each other like the first unit 35A. The number of the springs 37 is reduced.

In the centrifugal dehydration device 1 of the straight-body type constructed as described above, the outer carcass support cup 8 and the inner carcass screw 22 are rotationally driven by the drive unit 6 at different rotational speeds. The water content of the sludge and the like is supplied to the feeding area 24 of the rotary carcass 23 through the feeding pipe 3. In this way, the water content is subjected to centrifugal force, passes through the supply hole 26 from the feeding area 24, and moves toward the outer carcass support cup 8. After that, this water is transported from the supply side to the discharge side by the fan member 25 of the inner carcass screw 22 by the difference between the outer carcass support cup 8 and the inner carcass screw 22. One side is separated into separated water and dehydrated cake by centrifugal effect. Thereafter, the separation liquid is discharged from the separation liquid chute 28 to the outside of the device through the separation liquid discharge hole 11.

At the dewatered cake, the pressing force (back pressure) due to the discharge resistance is applied in the axial direction D by the valve body 17 during the process of being transported and discharged. In other words, the dehydrated cake transported by the blade member 25 of the inner body screw 22 toward one side D1 in the axial direction is caused by the fact that it touches the valve body 17 and presses it. Impeded with impedance.

As the moisture content of the dehydrated cake decreases, the pushing force of the dehydrated cake caused by the propulsive force of the inner carcass screw 22 becomes higher. If the pushing pressure of the dehydrated cake becomes greater than the discharge resistance caused by the group of disk springs 18, the disk springs 18 supporting one group of the valve body 17 are compressed, and the cake discharge path 27 is formed. That is, from the state in which the valve body 17 is closed as shown in FIG. 5 and the diameter-enlarged surface 15 and the inclined surface 21 are in surface contact, it is discharged as a cake as shown in FIG. 2. The state of the path 27. Accordingly, the dehydrated cake is discharged from the cake chute 29 to the outside of the device through the cake discharge passage 27 and through the cake discharge hole 12.

Here, the spring constant and the number of the disc springs 37 will be described. The spring constant and the number of the disc springs 37 are determined based on the specifications of the centrifugal dehydration device 1. For example, when the processing amount per unit time of the centrifugal dewatering device 1 is 50 m ³ , it is determined based on the processing of the water content of the processing amount, that is, based on the pushing pressure of the dehydrated cake during rated operation. Of it. Specifically, in the rated operation, the interval G1 between the enlarged diameter surface 15 and the inclined surface 21 is selected to be 1/3 of the interval G2 between the inner peripheral surface of the cup body 9 and the outer peripheral surface of the rotating carcass 23. Degree (hereinafter, referred to as the standard interval) and the number of spring constants. That is, the spring constant and the number of the disc springs 37 are set to make the elastic force of the entire group of the disc springs 18 and the pushing force of the dehydrated cake during the rated operation become standard intervals in the cake discharge path 27. Make choices in a balanced manner.

Here, if the moisture content of the dehydrated cake is further reduced, the pushing force of the dehydrated cake becomes larger, the interval G1 becomes larger than the standard interval, and the area of the cake discharge passage 27 increases. Due to the increase in the area of the cake discharge passage 27, the dehydrated cake is discharged more, and the residence time of the dehydrated cake becomes shorter. As a result, the moisture content of the dehydrated cake is restored from a low state to a high state, that is, the original state is restored. In addition, if the moisture content of the dehydrated cake increases, the pushing force of the dehydrated cake becomes smaller, the interval G1 becomes smaller than the standard interval, and the area of the cake discharge passage 27 decreases. Due to the decrease in the area of the cake discharge passage 27, the discharge amount of the dehydrated cake also decreased, and the residence time of the dehydrated cake became longer. As a result, the moisture content of the dehydrated cake is restored from a high state to a low state, that is, the original state is restored. That is, the retention time corresponds to the moisture content of the dehydrated cake, and the variation of the moisture content of the dehydrated cake is minimized.

If fibers or crystals are contained in the water, the fibers or crystals may accumulate in the cake discharge path 27. In this case, the area of the cake discharge passage 27 is temporarily reduced, and the discharge resistance is increased. As a result, the internal pressure system is increased, and the force for pressing the valve body 17 is increased. At this time, depending on the magnitude of the increased force, the valve body 17 moves backward toward one side D1 in the axial direction, and the area of the cake discharge passage 27 becomes large. That is, since the interval G1 between the enlarged diameter surface 15 and the inclined surface 21 becomes wider than the standard interval, the breadth of the cake discharge passage 27 is widened. As a result, the fibers and crystals accumulated in the cake discharge path 27 are removed. If the attachment is removed, the area of the cake discharge path 27 is restored to a standard interval by the elastic force of a group of disk springs 18.

Next, the effect by the shape of the support body 20 of this embodiment is demonstrated. (2) As described above, the support body 44 of the support 20 of this embodiment has a cylindrical shape. The end portion of the other side D2 of the support body 44 in the axial direction, that is, the cross-sectional shape including the axis O of the edge portion contacting the disc spring 37 is semicircular. As shown in FIG. 6, the support body 20 supports the disc spring 37 by one side D1 in the axial direction. Due to the deformation of the disc spring 37 from the state shown in FIG. 6 (a) to the generally compressed state shown in FIG. 6 (b), between the disc spring 37 and the support 20 The contact angle is changed. That is, the angle formed between the axis O at the contact point C1 and the enlarged diameter portion 38 (the disc spring 37), and the axis O at the contact point C2 and the enlarged diameter portion 38 (the disc spring 37) The angle between them will change. As shown in FIG. 7, along with the movement of the contact points C1 and C2, the contact angle also changes. Here, at the contact points C1 and C2, the disc spring 37 and the support 20 are in surface contact due to the elastic deformation of the support 20 slightly. At this time, when the cross-sectional shape of the support body 20 including the axis O is semicircular, the contact area between the disc spring 37 and the support body 20 does not change.

Next, as a comparative example, as shown in FIG. 8, the cross-sectional shape of the support body 44C including the axis O is rectangular, that is, the outer peripheral surface F1 of the support body 44C and the orientation axis of the support body 44C. The case where the surface F2 on the other side of the direction D2 is orthogonal to each other will be described. In this case, too, the disk spring 37 and the support 20C are deformed from the state shown in FIG. 8 (a) to the state shown in FIG. 8 (b), similarly. The contact angle between them is changed. Here, at the contact points C21 and C22, the disc spring 37 and the support 20 are in surface contact due to a slight elastic deformation of the support 20. At this time, when the cross-sectional shape of the support body 20C including the axis O is rectangular, the contact areas S21 and S22 between the disc spring 37 and the support body 20C are changed.

In this way, the contact angle between the disc spring 37 and the support 20C is changed due to the deformation of the disc spring 37, and the transmission system of the compression force of the disc spring 37 becomes unstable, so that the back pressure becomes unstable. . When the disc spring 37 is deformed, the ridge line between the outer peripheral surface F1 of the support body 44C and the surface F2 facing the other side D2 in the axial direction slides while contacting the disc spring 37, so friction occurs. The department is big. Because of this, abrasion due to friction occurs at the support body 44C side, and the deformation operation of the disc spring 37 is not smooth.

According to the above-mentioned embodiment, the place where the support body 20 is in contact with the disc spring 37 is formed in a semicircular shape, and even if the disc spring 37 and the support body 20 are caused by the expansion and contraction of the disc spring 37. When the contact angle of the contacted place changes, the friction coefficient and contact area also become constant. Therefore, when the disk spring 37 is deformed, the friction system between the disk spring 37 and the support 20 becomes small, and the wear system due to friction at the support 20 side is prevented, and the disk can be made. The deformation operation of the shape spring 37 becomes smooth. Accordingly, the compression force of the disc spring 37 can be stably transmitted to the valve body 17, and the back pressure caused by the disc spring 37 can be stabilized. In addition, the deformation operation of the disc spring 37 can be made smooth.

In addition, as a member that imparts elastic force to the valve body 17, the use of the disc spring 37 enables the centrifugal dewatering device 1 to be manufactured at a lower cost. In addition, since the disc spring 37 is provided so that the cylindrical portion 46 of the valve body 17 is fitted into the inner diameter surface, it can be reduced in size. In addition, since the system does not come into contact with a component (for example, the rotary body 23) having a difference in rotational speed with the disc spring 37 itself, the system can prevent abrasion.

In addition, since the valve body 17 is provided with the conical portion 45 and the cylindrical portion 46, the valve body 17 has a sufficient length in the axial direction D, and can prevent movement in a direction other than the axial direction D. With this, for example, even if a deviation occurs in the discharge pressure, the width of the cake discharge passage 27 is uniform at any position in the circumferential direction, and the water content can be discharged uniformly. In addition, since the water content can be discharged uniformly, it is possible to prevent abnormal vibrations caused by the imbalance in the weight inside the outer carcass support cup 8. That is, it is possible to prevent a situation in which the water content in the cake discharge passage 27 becomes uneven in the circumferential direction, which may adversely affect the operation performance of the centrifugal dewatering device 1.

The foregoing has described the embodiments of the present invention in detail with reference to the drawings. However, the structures and combinations of the various embodiments are only examples, and they do not depart from the gist of the present invention. Within the scope, the structure can be added, omitted, replaced, and other changes. The present invention is not limited by the embodiments, but is limited only by the scope of patent application.

1‧‧‧ Centrifugal Dewatering Device

2‧‧‧ rotating body

3‧‧‧Feeding tube

4‧‧‧shell

5‧‧‧ Support Unit

6‧‧‧Drive unit

8‧‧‧ Outer carcass bearing cup

9‧‧‧Cup body

10‧‧‧ Outer corpus callosum rotation axis

11‧‧‧ separation liquid discharge hole

12‧‧‧ Cake discharge hole

13‧‧‧ protrusion

14‧‧‧ Reduced diameter surface

15‧‧‧Expansion surface

16‧‧‧ Internal carcass rotation axis

17‧‧‧Valve body

18‧‧‧ cluster spring

19‧‧‧ end wall

20‧‧‧ support

21‧‧‧ bevel

22‧‧‧ Internal Carcass Screw

23‧‧‧rotating carcass

24‧‧‧Feeding area

25‧‧‧Fan blade member

26‧‧‧Supply hole

27‧‧‧ Cake discharge path

28‧‧‧ separating liquid chute

29‧‧‧cake chute

30‧‧‧ Supply-side support unit

31‧‧‧Discharge side support unit

32‧‧‧ Motor

33‧‧‧ with conduction mechanism

34‧‧‧ Differential device

Unit 35‧‧‧

36‧‧‧ was slid

37‧‧‧Disc spring

38‧‧‧Expansion Department

39‧‧‧ body

40‧‧‧ flange

41‧‧‧Screw

42‧‧‧oil seal member

43‧‧‧ pedestal

44‧‧‧ support body

45‧‧‧ cone

46‧‧‧Cylinder

47‧‧‧ sleeve

48‧‧‧sealing member

D‧‧‧axis direction

D1‧‧‧ One side of the axis

D2‧‧‧ the other side of the axis

O‧‧‧ axis

[Fig. 1] A sectional view of a centrifugal dehydration device according to an embodiment of the present invention. [Fig. 2] is a sectional view near the valve body of the centrifugal dehydration device according to the embodiment of the present invention. [Fig. 3] is a perspective view of a disc spring according to an embodiment of the present invention. [Fig. 4] is a diagram for explaining the combination type of the units constituting a group of coil springs according to the embodiment of the present invention. [Fig. 5] is a sectional view showing a state where the valve body according to the embodiment of the present invention is closed and the enlarged diameter surface and the inclined surface are in surface contact. [Fig. 6] is a diagram explaining the effect caused by the shape of the support in the embodiment of the present invention. [Fig. 7] is a diagram explaining the effect caused by the shape of the support of the embodiment of the present invention, and is a diagram explaining the contact area between the support and the disc spring. [Fig. 8] is a diagram explaining the effect caused by the shape of the support of the embodiment of the present invention, and is a diagram showing a comparative example. [Fig. 9] is a diagram explaining the effect caused by the shape of the support of the embodiment of the present invention, and is a diagram explaining the contact area between the support and the disc spring of the comparative example.

Claims (5)

A centrifugal dehydration device comprising a rotating body having a cylindrical outer carcass bowl to which water is supplied, and a rotating carcass housed in the outer carcass holder. A fan blade member is protruded on the peripheral surface, and an internal carcass screw for advancing the aforementioned water content toward one side of the axial direction is used to carry out dehydration by using centrifugal force while carrying the aforementioned water content; and the valve body is rotated with the aforementioned rotation The body is arranged coaxially, and is set in such a manner as to be able to adjust the width of the axial direction of the water-containing water discharge path formed at one end in the axial direction of the outer carcass support cup; and a group of A disc spring is arranged coaxially with the rotating body, and gives elastic force to the valve body in a direction that reduces the width; and a cylindrical support is made coaxially with the rotating body. The valve body is arranged so as to support the opposite side of the valve body of the group of coil springs in the axial direction from the valve body. The valve body is provided with a cone portion and a cylindrical portion. The tapered portion is provided with an inclined surface facing the other side in the axial direction and increasing in diameter as it goes toward one of the axial directions, and a vertical surface facing one of the axial directions. The cylindrical portion has an outer diameter of It is smaller than the maximum diameter of the conical portion, and is connected to one side of the conical portion in the axial direction. The group of disc springs is provided with an enlarged diameter around the conical portion. A plurality of circular disc springs, and the cylindrical part is inserted into the inner peripheral side of the enlarged diameter part, and the disc spring at the other end in the axial direction of the group of disc springs is connected to the conical part. In addition, one of the coil springs in the axial direction of the group of coil springs is arranged in such a manner that the coil springs are in contact with the support, and the coil springs at one end of the coil springs are directed toward the axial direction of the enlarged diameter portion. One side of the support body is in contact with the support body, and the place where the support body is in contact with the disc spring at one end of the support body extends in the peripheral direction at the other side in the axial direction as viewed from the peripheral direction. To the cross-sectional shape, semicircular line. The centrifugal dehydration device described in the first item of the patent application scope, wherein the aforementioned group of disc springs includes a plurality of disc springs as a group, and a plurality of the disc springs are arranged in series in the axial direction. Plural units. The centrifugal dehydration device according to item 2 of the scope of the patent application, wherein the aforementioned group of disc springs composed of the plurality of units includes a system in which the surfaces or back surfaces of the disc springs are in contact with each other. unit. The centrifugal dehydration device according to any one of claims 1 to 3, further comprising: a sliding cylinder connected to the outer carcass receiving cup, and the rotating carcass being The support body is inserted into the inner peripheral side, and the support body is fixed to the to-be-slided tube, and the to-be-slided tube is inserted into the inner peripheral side of the cylinder portion of the valve body via a sleeve. The centrifugal dehydration device according to item 4 of the scope of the patent application, wherein the outer body support cup, the to-be-slided cylinder, the valve body, the support body, and the group of disc springs rotate at a first speed. The rotating carcass rotates at a second speed, and the first speed is faster than the second speed.