KR102603564B1 - Cylindrical rotating body for weight reduction type centrifugal dehydrator and manufacturing method thereof and weight reduction type centrifugal dehydrator having the same - Google Patents

Abstract

The cylindrical rotating body 100 of this invention includes an inner member 140 made of stainless steel, a pair of fixing members 150 extending at both ends of the inner member in a protruding form along the edge of the inner member, and A first outer member 160 is integrated along the outer surface of the inner member and is made of a composite material, and is arranged longitudinally at equal intervals in the circumferential direction on the outer side of the first outer member, and both ends are tensioned by a pair of fixing members. By comprising a plurality of reinforcing members 170 fixed in a tensioned form, and a second outer member 180 made of a composite material and integrated along the outer surface of the first outer member in a form that covers the plurality of reinforcing members. , it has the advantage of maintaining strength and rigidity while reducing CO ₂ emissions by reducing power consumption through overall weight reduction.

Description

Cylindrical rotating body for weight reduction type centrifugal dehydrator and manufacturing method thereof and weight reduction type centrifugal dehydrator having the same}

This invention relates to a cylindrical rotor for a centrifugal dehydrator, and more specifically, to a cylindrical rotor for a weight-reducing centrifugal dehydrator that is composed of stainless steel, composite materials, reinforcing members, etc. to reduce weight while maintaining strength and rigidity, and the same. It is about manufacturing method. In addition, this invention also relates to a weight-reduction type centrifugal dehydrator having the above-mentioned cylindrical rotating body.

Currently, sewage discarded from homes or factories is sent to a sewage treatment plant and then treated. The sewage treatment process includes a water purification process and a sludge treatment process. In the water purification process, sewage is purified to the extent that the river's self-purifying effect can be activated and then discharged into public water bodies such as rivers. In the sludge treatment process, sewage is generated during the water purification process. The sludge is treated through processes such as concentration and dewatering.

Dehydrators, one of the devices used in the sludge treatment process, separate filtrate from sludge, and are classified into belt presses, filter presses, screw presses, centrifugal dehydrators, and electroosmotic dehydrators depending on their operating principles. Here, the centrifugal dehydrator is a device that injects sludge into the inside of a rotating body and then separates the filtrate from the sludge using centrifugal force.

To describe the centrifugal dehydrator in more detail, the rotating body (outer cylinder) has a uniform diameter portion extending in the front-back direction with a uniform diameter, and a conical portion extending from the front end of the uniform diameter portion so that the diameter gradually decreases. A sludge discharge hole is provided at the front end of the cone through which sludge separated from the filtrate, that is, a sludge cake, is discharged, and an outlet hole through which the filtrate is discharged is provided at the rear end of the uniform diameter section.

Additionally, a screw conveyor is installed inside the rotating body that rotates in the same direction as the rotating body, but whose rotation speed is slower than the rotating speed of the rotating body. Sludge to be dewatered is supplied to the central axis of this screw conveyor, and this sludge moves inside the rotating body. The sludge that moves inside the rotating body adheres to the inner surface of the rotating body due to centrifugal force, and at this time, the filtrate with a relatively low density is separated from the sludge that adheres to the inner surface of the rotating body. The sludge that adheres to the inner surface of the rotor is pulled forward by the screw blades of the screw conveyor and is discharged to the outside of the rotor through the sludge discharge hole, and the filtrate moves backward along the surface of the screw blade and flows out through the outlet hole. It is discharged to the outside of the rotating body.

These centrifugal dehydrators include Registered Patent No. 10-0877880 (solid-liquid separation type centrifugal dehydrator), Registered Patent No. 10-1428762 (centrifugal dehydrator for sludge), Registered Patent No. 10-1490746 (centrifugal dehydrator with improved dehydration performance), and Registered Patent No. It is disclosed in No. 10-0740608 (coagulation, concentration and centrifugal dehydration device).

Meanwhile, the rotating body is made of stainless steel, which has excellent corrosion resistance, strength, and rigidity. When manufacturing a rotating body using such stainless steel, the stainless steel is manufactured by centrifugal casting, and centrifugally cast to a size thicker than the thickness of the rotating body. For example, when it is desired to manufacture a rotating body with a thickness of 2 cm, centrifugal casting is performed to manufacture a rotating body with a thickness of approximately 4 cm. Then, the excess thickness is precisely processed and manufactured through a semi-automated process in which workers check and adjust it from time to time. In other words, precision processing is performed to ensure uniform thickness in all areas.

Additionally, the rotating body must have sufficient thickness to provide sufficient strength and rigidity to perform its function without being deformed by external forces applied during operation. However, manufacturing a rotating body with the above conditions from stainless steel has the disadvantage of requiring a lot of manufacturing costs, including raw material costs. Additionally, as the rotating body is made of heavy stainless steel, there is a problem in that a lot of power is consumed during dehydration, which increases operating costs.

The rise in global average temperature since the mid-20th century is believed to be mainly caused by a rapid increase in atmospheric carbon dioxide (CO ₂ ) concentration due to human industrial activities. Methods to reduce CO ₂ in the atmosphere can be largely divided into reduction of CO ₂ emissions and removal of emitted CO _2. Methods of reducing CO ₂ emissions include utilizing technologies such as renewable energy, nuclear energy, and energy efficiency. It is done.

Meanwhile, when dehydrating using a centrifugal dehydrator, the rotating body usually rotates at 3,000 to 4,000 rpm, and the centrifugal gravitational field at that time has 2,000 to 3,000 G, which is about 2,000 to 3,000 times the value of Earth's gravity (G). In a centrifugal dehydrator, the G value is affected by weight, so if you reduce the weight of the rotating body and/or screw conveyor that makes up the centrifugal dehydrator, you can reduce the centrifugal gravity field and reduce fatigue applied to the product, extending the product's service life. In addition, it can contribute to reducing CO ₂ emissions by reducing power consumption. Therefore, there is a need for technology that can maintain strength and rigidity while reducing the weight of the rotating body that constitutes the centrifugal dehydrator.

Registered Patent No. 10-0877880 Registered Patent No. 10-1428762 Registered Patent No. 10-1490746 Registered Patent No. 10-0740608

Therefore, this invention was developed to solve the problems of the prior art as described above, and integrates an outer member made of a composite material along the outer surface of an inner member made of stainless steel, but is tightly tensioned inside the outer member. A cylindrical rotor for a weight-reducing centrifugal dehydrator that can maintain strength and rigidity while reducing CO ₂ emissions by reducing power consumption through overall weight reduction by composing a structure with a plurality of reinforcing members fixedly arranged in a shape, and manufacturing thereof The purpose is to provide a method and a weight-reducing centrifugal dehydrator equipped with the same.

This invention to achieve the above object consists of a centrifugal dehydrator that dehydrates the sludge injected inside using centrifugal force, and rotates more quickly in the same direction as the screw conveyor installed inside, thereby rotating with the screw conveyor. In the cylindrical rotor for a centrifugal dehydrator that dehydrates sludge using a difference in speed, the inner member is made of stainless steel, and a pair of inner members extend at both ends of the inner member in a protruding form along the edge of the inner member. A fixing member, a first outer member integrated along the outer surface of the inner member and made of a composite material, disposed on the outer side of the first outer member in the longitudinal direction at equal intervals in the circumferential direction, and both ends of the pair of It includes a plurality of reinforcing members that are tightly tensioned to a fixing member, and a second outer member made of a composite material and integrated along the outer surface of the first outer member in a form that covers the plurality of reinforcing members, The first and second outer members are characterized in that they are integrated with each other in the form of the plurality of reinforcing members disposed therein.

In addition, according to this invention, the pair of fixing members further includes a plurality of holes for fixing both ends of the plurality of reinforcing members, respectively, and the plurality of reinforcing members are provided at both ends of the pair of fixing members. It is configured to have threads that can be fastened and fixed with a nut, and it is preferable to insert both threaded portions of the reinforcing member into the holes of the pair of fixing members and fasten them with nuts to respectively secure them to the pair of fixing members. do.

In addition, according to this invention, it is more preferable that the first and second outer members are formed by winding and curing a composite prepreg, or by winding multiple strands of reinforcing fibers and curing a resin covering the reinforcing fibers.

In addition, in order to achieve the above object, the method of manufacturing a cylindrical rotating body for a weight-reducing centrifugal dehydrator of this invention includes forming the first outer member along the outer surface of the inner member to which the fixing members are respectively fixed to both ends. Laminating the composite materials constituting the; Both ends of the plurality of reinforcing members are respectively inserted into the holes of the pair of fixing members and fastened with nuts to secure the plurality of reinforcing members to the outside of the composite material constituting the first outer member in a tautly tensed form. a placing step; Laminating the composite material constituting the second outer member along the outer surface of the composite material constituting the first outer member in a manner to cover the plurality of reinforcing members; And the inner member on which the composite material is sequentially laminated is wrapped with a vacuum bag, placed in an autoclave under vacuum, cured for a certain period of time, then taken out and the vacuum bag is removed, so that the first layer is sequentially applied to the outer surface of the inner member. It characterized by comprising the step of manufacturing a cylindrical rotating body in which an outer member, the plurality of reinforcing members, and the second outer member are stacked.

In addition, the weight-reducing centrifugal dehydrator of this invention for achieving the above object dehydrates the sludge injected inside using centrifugal force, but rotates more quickly in the same direction as the screw conveyor installed inside, so that the screw conveyor and It is provided with a cylindrical rotating body that dehydrates sludge using the difference in rotation speed, and the cylindrical rotating body is a cylindrical rotating body for a weight-reduction centrifugal dehydrator configured as described above.

This invention integrates an outer member made of a composite material along the outer surface of an inner member made of stainless steel, and constitutes a cylindrical rotating body with a structure having a plurality of reinforcing members fixed and arranged in a tightly tensioned form inside the outer member. By doing so, there is an advantage in that power consumption can be reduced by reducing the weight of the cylindrical rotating body, thereby reducing CO ₂ emissions while maintaining strength and rigidity.

1 is a cross-sectional schematic diagram showing the structural relationship of a weight-reducing centrifugal dehydrator according to an embodiment of the present invention;
Figure 2 is a schematic cross-sectional view showing the structural relationship between the cylindrical rotating body and the screw conveyor shown in Figure 1;
Figure 3 is a schematic perspective view showing the structural relationship of the cylindrical rotating body shown in Figure 2;
Figures 4 and 5 are cross-sectional views of the cylindrical rotating body shown in Figure 3 taken along line AA and line BB, respectively;
Figures 6 and 7 are process diagrams showing the manufacturing process of the cylindrical rotating body shown in Figures 3 to 5, respectively;
Figure 8 is a cross-sectional view showing the structural relationship between the central axis and the screw blades constituting the screw conveyor shown in Figure 2;
Figure 9 is a cross-sectional view showing a modified example of the central axis and screw blade shown in Figure 8.

Hereinafter, a cylindrical rotor for a weight-reduction type centrifugal dehydrator according to this invention, a method of manufacturing the same, and a preferred embodiment of a weight-reduction type centrifugal dehydrator equipped with the same will be described in detail with reference to the accompanying drawings. This invention is not limited to the embodiments disclosed below and may be implemented in various different forms, but these embodiments only serve to make the disclosure of this invention complete and to fully convey the scope of the invention to those skilled in the art. It is provided for information purposes only.

FIG. 1 is a schematic cross-sectional view showing the structural relationship of a weight-reducing centrifugal dehydrator according to an embodiment of the present invention, and FIG. 2 is a schematic cross-sectional view showing the structural relationship between the cylindrical rotating body and the screw conveyor shown in FIG. 1. As shown in Figures 1 and 2, the weight-reducing centrifugal dehydrator according to an embodiment of the present invention uses centrifugal force to dehydrate the sludge injected into the inside, and the cylindrical rotor for the weight-reducing centrifugal dehydrator (100, Hereinafter referred to as “cylindrical rotating body”), a case 200, a screw conveyor 300, and a sludge guideway 400.

The cylindrical rotating body 100 (outer cylinder) is accommodated inside the case 200, and includes a first cylindrical rotating body 100a having a cylindrical shape and a straight and uniform diameter on the inside and outside in the longitudinal direction, and a cylindrical shape. It has a second cylindrical rotating body (100b) whose outer side is straight in the longitudinal direction and whose inner side is straight and has a tapered inner diameter that gradually becomes smaller from a certain point to the point where sludge is discharged. It is preferable that the first and second cylindrical rotating bodies 100a and 100b are manufactured as one piece.

The first cylindrical rotating body 100a has uniform inner and outer diameters and extends in the front-back direction, and its rear end is rotatably coupled to the case 200. In addition, water discharge holes 110 are provided on the back of the first cylindrical rotating body 100a through which the filtrate separated from the sludge is discharged. The filtrate discharged to the outside of the first cylindrical rotating body 100a through the water outlet holes 110 is discharged to the outside of the case 200 through the filtrate discharge port 210 provided in the case 200.

The second cylindrical rotating body 100b is a portion extending forward from the front end of the first cylindrical rotating body 100a. As shown, the inside has a straight shape and its inner diameter extends from a certain point to the point where sludge is discharged. It has a tapered shape that gradually becomes smaller. By having an inwardly tapered shape in which the inner diameter gradually becomes smaller, the sludge can be given an inward pushing force, thereby smoothing the moisture content. The front end of the second cylindrical rotating body 100b is rotatably coupled to the case 200 and has sludge discharge holes 120 through which dewatered sludge (sludge cake) is discharged. The sludge cake discharged to the outside of the second cylindrical rotating body 100b through the sludge discharge holes 120 is discharged to the outside of the case 200 through the sludge discharge port 220 provided in the case 200.

The front end of the cylindrical rotating body 100 configured as above is connected to the rotating motor 130, so when the rotating motor 130 operates, the cylindrical rotating body 100 rotates at high speed, and then the cylindrical rotating body 100 rotates at high speed. A strong centrifugal force acts on the sludge located inside the rotating body 100. And, due to this centrifugal force, the relatively high-density solid comes into close contact with the inner surface of the cylindrical rotating body 100, and the relatively low-density filtrate forms a different layer from the solid material on the inside of the solid material and is physically separated from the solid material. .

The screw conveyor 300 is installed inside the cylindrical rotating body 100 to move the sludge in close contact with the inner surface of the cylindrical rotating body 100 forward (the direction in which the sludge discharge hole is located), and the central axis 320 ) and a screw wing 310. The rear end of the central axis 320 is rotatably coupled to the cylindrical rotating body 100, and the front end of the central axis 320 is also rotatably coupled to the cylindrical rotating body 100. The screw blade 310 has a root and a tip. The root is an inner end fixed to the central axis 320, and the tip is an outer end located slightly away from the inner surface of the cylindrical rotating body 100. .

The rear end of the screw conveyor 300 is connected to the conveyor motor 330, so when the conveyor motor 330 operates, the screw conveyor 300 rotates at high speed in the same direction as the cylindrical rotating body 100, It rotates more slowly than the cylindrical rotating body 100. Accordingly, there is a difference in rotation speed between the screw conveyor 300 and the cylindrical rotating body 100, and because of this, solid objects in close contact with the inner surface of the cylindrical rotating body 100 can be moved forward by being drawn by the screw blade 310. At this time, a space is secured between the solids drawn by the screw blade 310 and the central axis 320. Due to this space, the filtrate moves backward along the surface of the screw blade 310 and passes through the outlet hole 110. It is discharged to the outside of the first cylindrical rotating body 100a.

The sludge guideway 400 is provided inside the central axis 320 to extend in the front-back direction along the center of the central axis 320. At the front end of the central axis 320, a sludge supply pipe 410 that supplies sludge to be dewatered is coupled to allow rotation of the central axis 320. This sludge supply pipe 410 is connected to the front end of the sludge guide path 400. I'm in pain. Additionally, the rear end of the sludge guide path 400 communicates with the inside of the first cylindrical rotating body 100a. Accordingly, the sludge supplied from the sludge supply pipe 410 moves backward along the sludge guide path 400 and then moves inside the first cylindrical rotating body 100a.

As described above, in the weight-reducing centrifugal dehydrator, the sludge of the first cylindrical rotor (100a) is pulled forward by the screw blade 310 and enters the second cylindrical rotor (100b). After that, the sludge gradually moves. Due to the smaller diameter of the second cylindrical rotating body 100b, the sludge gathers toward the central axis 320 and is discharged through the sludge discharge hole 120.

FIG. 3 is a schematic perspective view showing the structural relationship of the cylindrical rotating body shown in FIG. 2, and FIGS. 4 and 5 are cross-sectional views of the cylindrical rotating body shown in FIG. 3 taken along line A-A and line B-B, respectively. As shown in Figures 3 to 5, the cylindrical rotating body 100 of this embodiment is constructed by manufacturing the first and second cylindrical rotating bodies 100a and 100b as one piece. This cylindrical rotating body 100 includes an inner member 140 made of stainless steel, and a pair of fixing members ( 150) and the first outer member 160, which is integrated along the outer surface of the inner member 140 and is made of a composite material, and is disposed in the longitudinal direction at equal intervals in the circumferential direction on the outer side of the first outer member 160. A plurality of reinforcing members 170 whose both ends are tautly fixed to a pair of fixing members 150, and an outer surface of the first outer member 160 in a form that covers the plurality of reinforcing members 170. It is integrated according to the structure and includes a second outer member 180 made of a composite material. Here, the first and second outer members 160 and 180 are integrated with each other with a plurality of reinforcing members 170 disposed therein. Meanwhile, in order to improve the adhesive strength between the inner member 140 and the first outer member 160 as they are composed of different materials of stainless steel and composite material, a separate adhesive member is installed between the inner member 140 and the first outer member ( 160).

The inner member 140 has a straight cylindrical shape on the outside and a straight cylindrical shape on the inside, and has a tapered shape whose inner diameter gradually becomes smaller from a certain point to the point where sludge is discharged. This inner member 140 is manufactured from stainless steel. When manufacturing the inner member 140 using this stainless steel, the stainless steel is manufactured by centrifugal casting, but the inner member 140 is thicker than the thickest part of the inner member 140. Centrifugally cast into thick sizes. Then, the excess thickness is precisely processed and manufactured through a semi-automated process in which workers check and adjust it from time to time. That is, the outside of the inner member 140 has a straight cylindrical shape in the longitudinal direction, and the inside of the inner member 140 has a straight cylindrical shape, and the inner diameter gradually decreases from a certain point to the point where the sludge is discharged. It can be manufactured by precisely machining the extra thickness on the inside to have a tapered shape that becomes smaller. In this way, the inside of the inner member 140 has a straight cylindrical shape and has an inwardly tapered shape whose inner diameter gradually becomes smaller from a certain point, so that the sludge can be given an inward pushing force to smooth the moisture content. You can.

The pair of fixing members 150 are respectively fixed to both ends of the inner member 140, and fix both ends of each reinforcing member 170 in a tightly tensioned form. In addition, it extends in a protruding form along the edge of the inner member 140, and also serves as a locking protrusion to prevent the first and second outer members 160 and 180 from deviating to the outside of the inner member 140. . This pair of fixing members 150 may be composed of a disk of a certain thickness having an inner diameter that is the same as the inner diameter of both ends of the inner member 140 and an outer diameter that protrudes at a certain height along the edge of the inner member 140. . This pair of fixing members 150 may be respectively fixed to both ends of the inner member 140 using a bolt 156 fixing method, a bolt/nut fastening method, or welding. Meanwhile, the pair of fixing members 150 may be configured to further have a plurality of holes 152 for fixing both ends of the plurality of reinforcing members 170 using a nut fastening method. At this time, the plurality of holes 152 are formed at equal intervals.

The first outer member 160 is made of a composite material and is integrated along the outer surface of the inner member 140, and the specific structural relationship will be described later.

The plurality of reinforcing members 170 are arranged in the longitudinal direction at equal intervals in the circumferential direction on the outside of the first outer member 160, and both ends are tightly fixed to a pair of fixing members 150. , can be composed of a steel wire with a certain diameter. At this time, both ends of the reinforcing member 170 may be configured to have threads (not shown) that can be fastened to the pair of fixing members 150 with nuts 154. That is, by inserting both threaded portions of the reinforcing member 170 into the holes 152 of the pair of fixing members 150 and tightening them with the nut 154 to secure them to the pair of fixing members 150, a plurality of Two reinforcing members 170 may be placed on the outside of the first outer member 160 in a tightly tensioned form. These plurality of reinforcing members 170 serve to reduce the weight by reinforcing the strength and rigidity of the inner member 140 and reducing the thickness of the inner member 140.

The second outer member 180 is made of a composite material and is integrated along the outer surface of the first outer member 160 in a form that covers a plurality of reinforcing members 170.

The first and second outer members 160 and 180 are made of a composite material. Composite material refers to a material that has an effective function by combining two or more types of materials with different components or shapes. Components of composite materials include fibers, particles, layers, and matrices. Composite materials composed of these elements are generally classified as layered composites, particle-reinforced composites, and fibers. It can be classified into reinforced composite material (Fiber Reinforced Composite Material, FRC), etc. FRC is also called fiber reinforced plastic (FRP).

The first outer member 160 is integrated along the outer surface of the inner member 140, and the second outer member 180 is formed to cover the plurality of reinforcing members 170. It is integrated along the outer surface and is basically composed of reinforcing fibers and matrix. Here, glass fiber, carbon fiber, aramid fiber, polyester fiber, polyvinyl acrylic fiber, etc. can be used as reinforcing fiber. Aramid fibers include Kevlar fiber (product name, Dupont, USA), Spectra fiber (product name, Honeywell, USA), and Dyneema fiber (product name, DSM, Netherlands). DSM), etc. may be applied.

And, as the matrix, epoxy resin, polyester resin, vinyl ester resin, polyurethane resin, etc. can be used.

Figures 6 and 7 are process charts showing the manufacturing process of the cylindrical rotating body shown in Figures 3 to 5, respectively, and are process charts showing the process of manufacturing the cylindrical rotating body by a co-curing method. As shown in FIGS. 6 and 7, the cylindrical rotating body 100 of this embodiment can be manufactured by a co-curing method.

As shown in FIG. 6, an appropriate stacking angle (0°, 45°) is used to form the first outer member 160 along the outer surface of the inner member 140, where the fixing members 150 are respectively fixed to both ends. , 90°, etc.) is wound and laminated. At this time, in order to improve adhesion on the outer surface of the inner member 140, a separate adhesive member may be applied and the composite prepreg 162 for forming the first outer member 160 may be wound and laminated.

Then, both ends of the plurality of reinforcing members 170 composed of steel wires with threads at both ends are inserted into the holes 152 of the pair of fixing members 150 and tightened with nuts 154 to form a pair. By fixing to the fixing member 150, the plurality of reinforcing members 170 are arranged and fixed to the outside of the composite material prepreg 162 constituting the first outer member 160 in a tightly tensioned form. Thereafter, in order to construct the second outer member 180, a composite material prepreg 182 having an appropriate stacking angle (0°, 45°, 90°, etc.) is prepared to cover the plurality of reinforcing members 170. 1 It is wound and laminated on the outer surface of the composite material prepreg 162 constituting the outer member 160.

Then, the inner member 140 on which the composite material prepregs 162 and 182 are sequentially laminated is wrapped with a vacuum bag 190. At this time, the vacuum bag 190 is wrapped so as to be in close contact with the outer surface of the composite material prepreg 182. Then, vacuum is applied to the vacuum bag 190 so that the composite prepreg is brought into close contact with the outer surface of the inner member 140 by the vacuum bag 190. The inner member 140 in this state is placed in an autoclave, cured for a certain period of time, then taken out and the vacuum bag 190 is removed, thereby sequentially forming a first outer member 160 and a plurality of pieces on the outer surface of the inner member 140. The cylindrical rotating body 100 of this embodiment in which the reinforcing member 170 and the second outer member 180 are laminated is manufactured. At this time, the first and second outer members 160 and 180 are integrated with each other with a plurality of reinforcing members 170 disposed therein.

In another method, as shown in FIG. 7, the same type as above is used to form the first outer member 160 along the outer surface of the inner member 140, where the fixing members 150 are respectively fixed to both ends. Multiple strands of reinforcing fibers 164 are wound. At this time, reinforcing fibers 164 are wound in various directions and in multiple layers along the outer surface of the inner member 140 as described above according to the specifications to be manufactured. Then, the outer surface of the inner member 140 around which the reinforcing fibers 164 are wound is coated with the same type of resin 166 as described above. If necessary, the process of winding the reinforcing fiber 164 and applying the resin 166 may be repeated several times. Through this process, the process for constructing the first outer member 160 is completed.

Then, both ends of the plurality of reinforcing members 170 composed of steel wires with threads at both ends are inserted into the holes 152 of the pair of fixing members 150 and tightened with nuts 154 to form a pair. By fixing to the fixing member 150, the plurality of reinforcing members 170 are arranged and fixed to the outside of the resin 166 constituting the first outer member 160 in a tightly tensioned form. Thereafter, the process of configuring the first outer member 160 to form the second outer member 180 is the same, but the reinforcing fibers 184 and resin 186 are used to cover the plurality of reinforcing members 170. The resin 166 constituting the first outer member 160 is wound and applied along the outer surface. If necessary, the process of winding the reinforcing fibers 184 and applying the resin 186 may be repeated several times. Through this process, the process for constructing the second outer member 180 is completed.

Then, the inner member 140, on which the reinforcing fibers 164 and 184 and the resins 166 and 186 are sequentially wound and applied, is wrapped with a vacuum bag 190. At this time, the vacuum bag 190 is wrapped so as to be in close contact with the outer surface of the resin 186. Then, a vacuum is applied to the vacuum bag 190 so that the resins 166 and 186 are filled between the reinforcing fibers 164 and 184 and the plurality of reinforcing members 170. The inner member 140 in this state is placed in an autoclave, cured for a certain period of time, then taken out and the vacuum bag 190 is removed, thereby sequentially forming a first outer member 160 and a plurality of pieces on the outer surface of the inner member 140. The cylindrical rotating body 100 of this embodiment in which the reinforcing member 170 and the second outer member 180 are laminated is manufactured. At this time, the first and second outer members 160 and 180 are integrated with each other with a plurality of reinforcing members 170 disposed therein.

FIG. 8 is a cross-sectional view showing the structural relationship between the central axis and screw blades constituting the screw conveyor shown in FIG. 2. As shown in FIG. 8, the screw conveyor 300 includes a central axis 320 and a screw blade 310, and the central axis 320 is made of hollow stainless steel to reduce weight. It is desirable. It is more preferable that the central axis 320 further includes a plurality of support members 322 that divide the hollow interior in the longitudinal direction to form partition walls. That is, in order to reinforce the strength and rigidity of the central axis 320 as the central axis 320 is configured as a hollow shape to reduce weight, the interior of the hollow shape is divided in the longitudinal direction through a plurality of support members 322. It formed the pillars of the bulkhead. This central axis 320 is manufactured by welding a plurality of cylinders each having a support member 322 on one side. At this time, the portion where the sludge guideway 400 is located is a space where the sludge guideway 400 can be placed. It can be manufactured using a cylinder having a shaped support member 322.

Figure 9 is a cross-sectional view showing a modified example of the central axis and screw blade shown in Figure 8. As shown in FIG. 9, the screw conveyor 300 of this embodiment includes a central axis 320 and a screw blade 310, and the central axis 320 is a hollow first center made of a composite material. It is preferable to consist of a shaft 324 and a second central shaft 326 made of plastic that is arranged to surround the outside of the first central shaft 324 and is integrated with the screw blade 310. Here, the first central axis 324 can be manufactured and integrated using a general method of manufacturing a cylinder and a partially modified form of the cylinder using a composite material. Additionally, the second central axis 326 and the screw blade 310 may be manufactured by casting a plastic material such as polyurethane. Meanwhile, the screw blade 310 takes into account the large load and the friction between the inner surface of the cylindrical rotating body 100 when transferring the dewatered sludge to the sludge discharge hole 120. It is desirable to reinforce some surfaces by wrapping them with steel plates or to form a reinforcing layer by coating them with a separate thin film.

Meanwhile, in manufacturing the weight-reducing centrifugal dehydrator according to this embodiment, the screw conveyor 300 is located inside the cylindrical rotating body 100 manufactured by the simultaneous curing method as shown in FIGS. 6 and 7. It is manufactured through a process of assembling the screw conveyor 300 and the cylindrical rotating body 100 inside the case 200 so that the sludge injected inside can be dewatered using centrifugal force. .

Below, the operating process of the weight-reducing centrifugal dehydrator of this embodiment configured as described above will be described.

When the rotating motor 130 and the conveyor motor 330 operate, the cylindrical rotating body 100 and the screw conveyor 300 rotate at high speed in the same direction. At this time, the cylindrical rotating body 100 rotates on the screw conveyor 300. ) rotates faster than

In this state, sludge is supplied from the sludge supply pipe 410. The supplied sludge moves into the interior of the cylindrical rotor 100 along the sludge guide path 400, adheres to the inner surface of the cylindrical rotor 100 by centrifugal force, and is separated from the filtrate to form a different layer. The sludge separated from the filtrate moves forward by being pulled by the screw blade 310 and is discharged through the sludge discharge hole 120 at the front end of the second cylindrical rotor 100b, and the filtrate flows backward along the surface of the screw blade 310. It flows and is discharged through the outlet hole (110).

As described above, in the weight-reducing centrifugal dehydrator, the sludge of the first cylindrical rotor (100a) is pulled forward by the screw blade 310 and enters the second cylindrical rotor (100b). After that, the sludge gradually moves. Due to the smaller diameter of the second cylindrical rotating body 100b, the sludge gathers toward the central axis 320 and is discharged through the sludge discharge hole 120.

In the previously described embodiment, the inside of the inner member 140 constituting the cylindrical rotating body 100 has a straight cylindrical shape and is configured to have a tapered shape whose inner diameter gradually becomes smaller from a certain point to the point where sludge is discharged. However, it is also possible to deform the inner member 140 into a cylinder in which the outer and inner sides of the inner member 140 continuously have a straight cylindrical shape. In this case, the screw conveyor 300 located inside the inner member 140 is configured by partially modifying the size of the central axis 320 and/or the screw blade 310 to suit the deformed inner member 140. Just do it.

The cylindrical rotating body 100 for a weight-reducing centrifugal dehydrator according to this embodiment has first and second outer members 160 and 180 made of a composite material along the outer surface of the inner member 140 made of stainless steel. By integrating the first and second outer members 160 and 180 into a structure with a plurality of reinforcing members 170 fixed and tightly placed inside the first and second outer members 160 and 180, power consumption is reduced through overall weight reduction, thereby reducing CO ₂ Strength and rigidity can be maintained while reducing emissions.

The weight-reducing centrifugal dehydrator according to this embodiment consists of a cylindrical rotating body 100 as described above, but the outer side of the inner member 140 is in the shape of a straight cylinder in the longitudinal direction, and the inner side of the inner member 140 is straight. By having a cylindrical shape and configuring it to have a tapered shape with the inner diameter gradually getting smaller from a certain point to the point where the sludge is discharged, power consumption is reduced by reducing the weight of the cylindrical rotating body 100, thereby reducing CO ₂ emissions. Strength and rigidity can be maintained.

In addition, the weight-reducing centrifugal dehydrator according to this embodiment consists of a central axis 320 of the screw conveyor 300 made of hollow stainless steel, and the interior of the hollow shape is divided in the longitudinal direction to form a partition wall. By reinforcing the support member 322, power consumption can be reduced by reducing the weight of the screw conveyor 300, thereby reducing CO ₂ emissions, while maintaining strength and rigidity.

In addition, the weight-reducing centrifugal dehydrator according to this embodiment has a central axis 320 of the screw conveyor 300, a hollow first central axis 324 made of a composite material, and an outer side of the first central axis 324. It is composed of a second central axis 326 made of plastic that is arranged in a form that surrounds the screw blade 310 and is integrated with it, thereby reducing power consumption by reducing the weight of the screw conveyor 300, thereby reducing CO ₂ emissions and improving strength. and rigidity can be maintained.

In the above, the cylindrical rotor for a weight-reduction type centrifugal dehydrator of this invention, the manufacturing method thereof, and the technical details of the weight-reduction type centrifugal dehydrator equipped with the same are described together with the accompanying drawings, but this is an example of the best embodiment of this invention. It has been explained. Therefore, this invention is not limited to the embodiments described above, and it is obvious to those skilled in the art that various modifications and variations can be made without departing from the spirit and scope of the invention, and such modifications Examples or modifications may also fall within the scope of the claims of this invention.

100: cylindrical rotating body 140: inner member
150: fixing member 160: first outer member
170: reinforcing member 180: second outer member
200: Case 300: Screw conveyor
400: Sludge guideway

Claims (5)

It consists of a centrifugal dehydrator that dehydrates sludge injected inside using centrifugal force. It rotates faster in the same direction as the screw conveyor installed inside and dehydrates sludge using the difference in rotation speed with the screw conveyor. In a cylindrical rotating body,
An inner member made of stainless steel,
a pair of fixing members extending at both ends of the inner member in a protruding form along an edge of the inner member;
a first outer member integrated along the outer surface of the inner member and made of a composite material;
A plurality of reinforcing members arranged in the longitudinal direction at equal intervals in the circumferential direction on the outside of the first outer member and both ends of which are tightly secured to the pair of fixing members, and
A second outer member is integrated along the outer surface of the first outer member to cover the plurality of reinforcing members and is made of a composite material,
A cylindrical rotating body for a weight-reducing centrifugal dehydrator, wherein the first and second outer members are integrated with each other in the form of the plurality of reinforcing members disposed therein. In claim 1,
The pair of fixing members further includes a plurality of holes for fixing both ends of the plurality of reinforcing members, respectively,
The plurality of reinforcing members are configured to have threads at both ends that can be fastened to the pair of fixing members with nuts. Insert both threaded portions of the reinforcing members into the holes of the pair of fixing members and attach the nuts. A cylindrical rotating body for a weight-reducing centrifugal dehydrator, characterized in that it is fastened to each of the pair of fixing members. In claim 2,
The first and second outer members are formed by winding and curing a composite prepreg, or by winding a plurality of strands of reinforcing fibers and curing a resin covering the reinforcing fibers. entire. A method for manufacturing a cylindrical rotor for a weight-reducing centrifugal dehydrator according to claim 2 or claim 3, comprising:
Laminating the composite material constituting the first outer member along the outer surface of the inner member to which the fixing members are respectively fixed to both ends;
Both ends of the plurality of reinforcing members are respectively inserted into the holes of the pair of fixing members and fastened with nuts to secure the plurality of reinforcing members to the outside of the composite material constituting the first outer member in a tautly tensed form. a placing step;
Laminating the composite material constituting the second outer member along the outer surface of the composite material constituting the first outer member in a manner to cover the plurality of reinforcing members; and
The inner member on which the composite material is sequentially laminated is wrapped with a vacuum bag, placed in an autoclave under vacuum, cured for a certain period of time, then taken out and the vacuum bag is removed, so that the first outer member is sequentially applied to the outer surface of the inner member. A method of manufacturing a cylindrical rotating body for a weight-reducing centrifugal dehydrator, comprising the step of manufacturing a cylindrical rotating body in which a member, the plurality of reinforcing members, and the second outer member are stacked. A centrifugal dehydrator equipped with a cylindrical rotating body that uses centrifugal force to dehydrate the sludge injected inside, but rotates more quickly in the same direction as the screw conveyor installed inside and dehydrates the sludge using the difference in rotation speed with the screw conveyor. Because,
A weight-saving centrifugal dehydrator, characterized in that the cylindrical rotor is a cylindrical rotor for a weight-saving centrifugal dehydrator according to any one of claims 1 to 3.

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