Cylindrical rotating body for weight-reducing centrifugal dehydrator and method for manufacturing the same, and weight-reducing centrifugal dehydrator equipped with the same and method for manufacturing the same

Abstract

The cylindrical rotating body (100) of the present invention comprises an inner member (140) made of stainless steel, a pair of fixing members (150) extending from both ends of the inner member in a manner that protrudes along the edge of the inner member, a first outer member (160) made of a composite material and integrated along the outer surface of the inner member, a plurality of reinforcing members (170) arranged on the outside of the first outer member at equal intervals in the circumferential direction and in the longitudinal direction, with both ends fixed in a manner that the pair of fixing members are stretched tightly together, and a second outer member (180) made of a composite material and integrated along the outer surface of the first outer member in a manner that covers the plurality of reinforcing members. This configuration has the advantage of reducing power consumption and CO2 emissions by reducing the overall weight, while maintaining strength and rigidity.

Description

Technical Field

[0001] The present invention relates to a cylindrical rotor for a centrifugal dehydrator, and more specifically, to a cylindrical rotor for a weight-reduced centrifugal dehydrator that is composed of stainless steel, a composite material, a reinforcing member, etc., and can reduce weight while maintaining strength and rigidity, and a manufacturing method thereof. Further, the present invention relates to a weight-reduced centrifugal dehydrator that configures the cylindrical rotor as described above and reduces weight while maintaining strength and rigidity by making the screw conveyor into a hollow shape with a reinforcing structure, and a manufacturing method thereof.

Background Art

[0002] Currently, sewage discarded at home, factories, etc. is treated after being sent to a sewage treatment plant. The sewage treatment process includes a purification process and a sludge treatment process. In the purification process, sewage is purified until it reaches a range where the self-purification action of rivers can be activated, and then discharged into public waters such as rivers. In the sludge treatment process, the sludge generated in the purification process is treated through processes such as concentration and dehydration.

[0003] A dehydrator, which is one of the devices used in the sludge treatment process, separates filtrate from sludge, and is classified into a belt press, a filter press, a screw press, a centrifugal dehydrator, an electroosmotic dehydrator, etc. according to the operating principle. Here, a centrifugal dehydrator is a device that injects sludge into the inside of a rotating rotor and then separates the filtrate from the sludge using centrifugal force.

[0004] To describe the centrifugal dehydrator more specifically, the rotor (outer cylinder) has a uniform diameter portion that has a uniform diameter and extends in the front-rear direction, and a conical portion that extends from the front end of the uniform diameter portion such that its diameter gradually decreases. A sludge discharge hole for discharging sludge separated from the filtrate, i.e., sludge cake, is provided at the front end of the conical portion, and a water outlet hole for discharging the filtrate is provided at the rear end of the uniform diameter portion.

[0005] Furthermore, a screw conveyor is installed inside the rotating body, rotating in the same direction as the rotating body but at a slower rotational speed than the rotating body. Sludge to be dewatered is supplied to the central axis of the screw conveyor, and this sludge moves into the interior of the rotating body. Once inside the rotating body, the sludge adheres to the inner surface of the rotating body due to centrifugal force, and at this time, the filtrate, which has a relatively lower 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 rotating body is pulled forward by the screw blades of the screw conveyor and is discharged to the outside of the rotating body through the sludge discharge hole, while the filtrate moves backward along the surface of the screw blades and is discharged to the outside of the rotating body through the water outlet hole.

[0006] Such centrifugal dewatering machines are disclosed in Patent Document 1 (Solid-Liquid Separation Type Centrifugal Dewatering Machine), Patent Document 2 (Centrifugal Dewatering Machine for Sludge), Patent Document 3 (Centrifugal Dewatering Machine with Improved Dewatering Performance), Patent Document 4 (Agglutination, Concentration and Centrifugal Dewatering Apparatus), etc.

[0007] The rotating body is made of stainless steel, which has excellent corrosion resistance, strength, and rigidity. When manufacturing the rotating body using such stainless steel, the stainless steel is produced using a centrifugal casting method, and centrifugal casting is performed to a thickness greater than that of the rotating body. For example, if a rotating body with a thickness of 2 cm is to be manufactured, centrifugal casting is performed to produce a rotating body with a thickness of approximately 4 cm. Then, it is manufactured by precision machining using a semi-automated process in which an operator checks and adjusts the excess thickness as needed. In other words, precision machining is performed so that the thickness is uniform in all parts.

[0008] Furthermore, the rotating body must have sufficient thickness to provide enough strength and rigidity to perform its function properly without deforming due to external forces applied during operation. However, manufacturing a rotating body that meets the above conditions out of stainless steel has the disadvantage of high manufacturing costs, including raw material costs. In addition, because the rotating body is made of heavy stainless steel, a lot of power is consumed during dewatering, which leads to high running costs.

[0009] The rise in the Earth's average temperature since the mid-20th century has been analyzed to be mainly caused by the rapid increase in atmospheric carbon dioxide (CO2) concentration due to human industrial activities. Methods for reducing atmospheric CO2 can be divided into reducing CO2 emissions and removing emitted CO2. Methods for reducing CO2 emissions include utilizing new renewable energy and nuclear energy, and employing energy efficiency technologies.

[0010] On the other hand, when dewatering using a centrifugal dewatering machine, the rotating body typically rotates at 3,000 to 4,000 rpm, and the centrifugal gravitational field at that time has a value of 2,000 to 3,000 G, which is approximately 2,000 to 3,000 times the value of Earth's gravity G. In a centrifugal dewatering machine, the G value is affected by weight, so reducing the weight of the rotating body and / or screw conveyor that make up the centrifugal dewatering machine reduces the centrifugal gravitational field and the fatigue applied to the product, thereby extending the product's service life. In addition, it helps to reduce CO2 emissions by reducing power consumption. Therefore, there is a need for technology that can reduce the weight of the rotating body and / or screw conveyor that make up the centrifugal dewatering machine while maintaining its strength and rigidity. [Prior art documents] [Patent Documents]

[0011] [Patent Document 1] Korean Registered Patent Publication No. 10-0877880 [Patent Document 2] Korean Registered Patent Publication No. 10-1428762 [Patent Document 3] Korean Registered Patent Publication No. 10-1490746 [Patent Document 4] Korean Registered Patent Publication No. 10-0740608 [Overview of the project] [Problems that the invention aims to solve]

[0012] Therefore, the present invention has been made to solve the problems of the conventional technology described above, and its objective is to provide a cylindrical rotating body for a weight-reducing centrifugal dewatering machine and a method for manufacturing the same, which reduces power consumption and CO2 emissions by reducing the overall weight, while maintaining strength and rigidity, by integrating an outer member made of a composite material along the outer surface of an inner member made of stainless steel, and having a structure having a plurality of reinforcing members fixedly arranged in a form that is stretched inside the outer member.

[0013] Another object of the present invention is to provide a weight-reducing centrifugal dewatering machine and a method for manufacturing the same, which reduces power consumption and CO2 emissions by reducing the weight of the cylindrical rotating body, and reduces CO2 emissions by reducing the weight of the cylindrical rotating body, by configuring the cylindrical rotating body as described above, wherein the inner member has a cylindrical shape with a straight outer surface in the longitudinal direction, and the inner surface of the inner member has a cylindrical shape with a straight outer surface, and has a tapered shape in which the inner diameter gradually decreases from a predetermined point to a point where sludge is discharged.

[0014] Another object of the present invention is to provide a lightweight centrifugal dewatering machine and a method for manufacturing the same, which reduces power consumption and CO2 emissions by reducing the weight of the screw conveyor, while maintaining strength and rigidity, by making the central axis of the screw conveyor hollow and reinforcing it with multiple support members that divide the inside of the hollow in the longitudinal direction to form partition walls.

[0015] Furthermore, another object of the present invention is to provide a lightweight centrifugal dewatering machine and a method for manufacturing the same, which reduces power consumption and CO2 emissions by reducing the weight of the screw conveyor, while maintaining strength and rigidity, by configuring the central axis of the screw conveyor with a hollow first central axis made of composite material and a second central axis made of plastic that is arranged to surround the outside of the first central axis and is integrally formed with the screw blades. [Means for solving the problem]

[0016] To achieve the above objective, the present invention provides a centrifugal dewatering machine that uses centrifugal force to dewater sludge injected inside, and is a cylindrical rotating body for a centrifugal dewatering machine that dewaters sludge by rotating more rapidly in the same direction as a screw conveyor installed inside, thereby utilizing the difference in rotational speed with the screw conveyor to dewater the sludge, and includes an inner member made of stainless steel, a pair of fixing members extending from both ends of the inner member in a manner that protrudes along the edge of the inner member, a first outer member made of composite material that is integrated along the outer surface of the inner member, a plurality of reinforcing members arranged at equal intervals in the circumferential direction and longitudinally on the outside of the first outer member, with both ends fixed in a manner that is stretched to the pair of fixing members, and a second outer member made of composite material that covers the plurality of reinforcing members and is integrated along the outer surface of the first outer member, wherein the first and second outer members are integrated with each other in a manner that the plurality of reinforcing members are arranged inside them.

[0017] Furthermore, the present invention provides a method for manufacturing a cylindrical rotating body for a weight-reducing centrifugal dehydrator to achieve the above objectives, comprising the steps of: laminating composite material constituting the first outer member along the outer surface of the inner member, to which the fixing members are fixed at both ends; fitting the ends of the plurality of reinforcing members into the holes of the pair of fixing members and tightening them with nuts to position the plurality of reinforcing members on the outside of the composite material constituting the first outer member in a taut state; laminating composite material constituting the second outer member along the outer surface of the composite material constituting the first outer member so as to cover the plurality of reinforcing members; and wrapping the inner member, to which the composite material is sequentially laminated, in a vacuum bag, placing it in an autoclave under vacuum, curing it for a certain period of time, removing it, and removing the vacuum bag to manufacture a cylindrical rotating body in which the first outer member, the plurality of reinforcing members, and the second outer member are sequentially laminated on the outer surface of the inner member.

[0018] Furthermore, the weight-reducing centrifugal dewatering machine of the present invention, which achieves the above objectives, is equipped with a cylindrical rotating body that uses centrifugal force to dewater sludge injected inside and rotates more rapidly in the same direction as a screw conveyor installed inside, thereby utilizing the difference in rotational speed with the screw conveyor to dewater the sludge, and the cylindrical rotating body is a cylindrical rotating body for a weight-reducing centrifugal dewatering machine configured as described above.

[0019] Furthermore, the present invention provides a method for manufacturing a cylindrical rotating body for a weight-reducing centrifugal dehydrator to achieve the above objectives, comprising the steps of: laminating a composite material constituting the first outer member along the outer surface of the inner member, to which the fixing members are fixed at both ends; fitting the ends of the plurality of reinforcing members into the holes of the pair of fixing members and tightening them with nuts to position the plurality of reinforcing members on the outside of the composite material constituting the first outer member in a taut state; laminating a composite material constituting the second outer member along the outer surface of the composite material constituting the first outer member so as to cover the plurality of reinforcing members; and the composite material The method is characterized by comprising the steps of: manufacturing a cylindrical rotating body in which the first outer member, the plurality of reinforcing members, and the second outer member are sequentially laminated on the outer surface of the inner member by wrapping the sequentially laminated inner members in a vacuum bag, placing them in an autoclave under vacuum, curing them for a certain period of time, removing them, and removing the vacuum bag; assembling the screw conveyor so that it is located inside the cylindrical rotating body; and assembling the screw conveyor and the cylindrical rotating body by placing them inside a case and assembling them in a way that allows for the dewatering of sludge injected into the interior using centrifugal force. [Effects of the Invention]

[0020] The present invention forms a cylindrical rotating body with a structure having a plurality of reinforcing members integrally formed along the outer surface of an inner member made of stainless steel and fixed in a state of being stretched inside the outer member, thereby reducing power consumption and CO2 emissions due to the weight reduction of the cylindrical rotating body and maintaining strength and rigidity.

[0021] Further, the present invention configures the cylindrical rotating body as described above, where the outer side of the inner member has a linear cylindrical shape in the longitudinal direction, the inner side of the inner member has a linear cylindrical shape, and the inner diameter gradually decreases from a predetermined location to a location where sludge is discharged, so that the weight reduction of the cylindrical rotating body reduces power consumption and CO2 emissions, and at the same time, strength and rigidity can be maintained.

[0022] Also, the present invention makes the central axis of the screw conveyor hollow and reinforces it with a plurality of support members that divide the hollow interior in the longitudinal direction to form partitions, thereby reducing power consumption and CO2 emissions due to the weight reduction of the screw conveyor and maintaining strength and rigidity.

[0023] Furthermore, the present invention is composed of a hollow first central axis made of a composite material and a plastic second central axis that is arranged to surround the outside of the first central axis and is integrally formed with the screw blades, thereby reducing power consumption and CO2 emissions due to the weight reduction of the screw conveyor and maintaining strength and rigidity.

Brief Description of the Drawings

[0024] [[ID=第十九]] [Figure 1] It is a schematic cross-sectional view showing the configuration relationship of a weight-reduced centrifuge according to an embodiment of the present invention. [Figure 2] It is a schematic cross-sectional view showing the configuration relationship of the cylindrical rotating body and the screw conveyor shown in FIG. 1. [Figure 3]Figure 2 is a schematic perspective view showing the structural relationship of the cylindrical rotating body. [Figure 4] Figure 3 is a cross-sectional view of the cylindrical rotating body shown, obtained by cutting along line AA. [Figure 5] Figure 3 shows a cross-sectional view obtained by cutting the cylindrical rotating body along line BB. [Figure 6] Figures 3 to 5 are process diagrams illustrating the manufacturing process of the cylindrical rotating body. [Figure 7] Figures 3 to 5 are process diagrams illustrating the manufacturing process of the cylindrical rotating body. [Figure 8] Figure 2 is a cross-sectional view showing the configuration relationship between the central axis and screw blades that make up the screw conveyor. [Figure 9] Figure 8 is a cross-sectional view showing a modified example of the central axis and screw blades. [Modes for carrying out the invention]

[0025] Hereinafter, a cylindrical rotating body for a weight-reducing centrifugal dehydrator according to the present invention, a method for manufacturing the same, and preferred embodiments of a weight-reducing centrifugal dehydrator equipped therewith will be described in detail with reference to the accompanying drawings. The present invention is not limited to the embodiments disclosed below and can be realized in a variety of different forms, and these embodiments are provided to complete the disclosure of the present invention and to fully inform those in the ordinary skill of the scope of the invention.

[0026] Figure 1 is a schematic cross-sectional view showing the configuration of a weight-reducing centrifugal dewatering machine according to one embodiment of the present invention, and Figure 2 is a schematic cross-sectional view showing the configuration of the cylindrical rotating body and screw conveyor shown in Figure 1. As shown in Figures 1 and 2, the weight-reducing centrifugal dewatering machine according to one embodiment of the present invention dewaters sludge injected into it using centrifugal force, and comprises a cylindrical rotating body 100 (hereinafter referred to as "cylindrical rotating body"), a case 200, a screw conveyor 300, and a sludge guide path 400.

[0027] The cylindrical rotating body 100 (outer cylinder) is housed inside the case 200 and comprises a first cylindrical rotating body 100a which is cylindrical and has a uniform diameter that is linear in the longitudinal direction on both the inside and outside, and a second cylindrical rotating body 100b which is cylindrical and has a linear outer surface and a linear inner surface, and has a tapered shape in which its inner diameter gradually decreases from a predetermined location to a location where sludge is discharged. It is preferable that these first and second cylindrical rotating bodies 100a and 100b are manufactured and constructed as a single unit.

[0028] The first cylindrical rotating body 100a is a portion that extends in the front-rear direction while having a uniform inner and outer diameter, and its rear end is rotatably connected to the case 200. Furthermore, a water outlet 110 for discharging filtrate separated from the sludge is provided on the back surface of the first cylindrical rotating body 100a. The filtrate discharged to the outside of the first cylindrical rotating body 100a through the water outlet 110 is then discharged to the outside of the case 200 via a filtrate outlet 210 provided in the case 200.

[0029] The second cylindrical rotating body 100b is a portion that extends forward from the front end of the first cylindrical rotating body 100a, and as shown in the figure, it has a straight shape and a tapered shape in which its inner diameter gradually decreases from a predetermined point to the point where the sludge is discharged. By having a tapered shape in which the inner diameter gradually decreases inward, a force can be applied to press the sludge inward, thereby reducing the water content. The front end of this second cylindrical rotating body 100b is rotatably connected to the case 200 and has a sludge discharge hole 120 for discharging the dewatered sludge (sludge cake). The sludge cake discharged to the outside of the second cylindrical rotating body 100b through the sludge discharge hole 120 is discharged to the outside of the case 200 through a sludge discharge port 220 provided in the case 200.

[0030] As described above, the front end of the cylindrical rotating body 100 is connected to the rotating body motor 130. When the rotating body motor 130 is activated, the cylindrical rotating body 100 rotates at high speed, and a strong centrifugal force acts on the sludge located inside the cylindrical rotating body 100. Due to this centrifugal force, the relatively high-density solid matter adheres closely to the inner surface of the cylindrical rotating body 100, while the relatively low-density filtrate forms a separate layer inside the solid matter, physically separating it from the solid matter.

[0031] The screw conveyor 300 is installed inside the cylindrical rotating body 100 to move sludge adhering to the inner surface of the cylindrical rotating body 100 forward (in the direction in which the sludge discharge hole is located), and includes a central shaft 320 and screw blades 310. The rear end of the central shaft 320 is rotatably connected to the cylindrical rotating body 100, and the front end of the central shaft 320 is also rotatably connected to the cylindrical rotating body 100. The screw blades 310 have a root and a tip, the root being an inner end fixed to the central shaft 320, and the tip being an outer end located slightly away from the inner surface of the cylindrical rotating body 100.

[0032] The rear end of the screw conveyor 300 is connected to a conveyor motor 330. When the conveyor motor 330 is activated, the screw conveyor 300 rotates at high speed in the same direction as the cylindrical rotating body 100, but at a slower speed than the cylindrical rotating body 100. Therefore, a difference in rotational speed is created between the screw conveyor 300 and the cylindrical rotating body 100. As a result, solid matter adhering to the inner surface of the cylindrical rotating body 100 can be pulled forward by the screw blades 310. At this time, a space is created between the solid matter being pulled by the screw blades 310 and the central axis 320. Due to this space, the filtrate moves backward along the surface of the screw blades 310 and is discharged to the outside of the first cylindrical rotating body 100a through the outlet hole 110.

[0033] The sludge guide passage 400 is provided inside the central axis 320 so as to extend in the front-rear direction along the center of the central axis 320. A sludge supply pipe 410, which supplies sludge to be dewatered, is connected to the front end of the central axis 320 in such a way that it allows the rotation of the central axis 320, and this sludge supply pipe 410 is in communication with the front end of the sludge guide passage 400. The rear end of the sludge guide passage 400 is in communication with the inside of the first cylindrical rotating body 100a. Therefore, the sludge supplied from the sludge supply pipe 410 moves backward along the sludge guide passage 400 and moves into the inside of the first cylindrical rotating body 100a.

[0034] As described above, in the weight-reducing centrifugal dewatering machine, the sludge from the first cylindrical rotating body 100a is pulled forward by the screw blades 310 and moves into the second cylindrical rotating body 100b. Subsequently, due to the increasingly smaller diameter of the second cylindrical rotating body 100b, the sludge is collected towards the central axis 320 and discharged through the sludge discharge hole 120.

[0035] Figure 3 is a schematic perspective view showing the structural relationship of the cylindrical rotating body shown in Figure 2, and Figures 4 and 5 are cross-sectional views showing the cylindrical rotating body shown in Figure 3 cut along lines AA and BB, 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 a single unit. The cylindrical rotating body 100 includes an inner member 140 made of stainless steel, a pair of fixing members 150 extending from both ends of the inner member 140 in a manner that protrudes along the edge of the inner member 140, a first outer member 160 made of composite material and integrated along the outer surface of the inner member 140, a plurality of reinforcing members 170 arranged circumferentially at equal intervals and longitudinally on the outside of the first outer member 160, with both ends fixed in a manner that the pair of fixing members 150 are stretched taut, and a second outer member 180 made of composite material and integrated along the outer surface of the first outer member 160 in a manner that covers the plurality of reinforcing members 170. Here, the first and second outer members 160 and 180 are integrated with each other in a manner that the plurality of reinforcing members 170 are arranged inside them. Furthermore, by constructing the inner member 140 and the first outer member 160 from dissimilar materials, such as stainless steel and a composite material, a separate adhesive member may be positioned between the inner member 140 and the first outer member 160 to improve the adhesive strength between them.

[0036] The inner member 140 has a cylindrical shape with a straight longitudinal direction on the outside, and a tapered shape with a straight cylindrical shape on the inside, where the inner diameter gradually decreases from a predetermined point to a point where sludge is discharged. Such an inner member 140 is made of stainless steel, and in manufacturing the inner member 140 using such stainless steel, the stainless steel is manufactured by centrifugal casting, and centrifugal casting is performed to a thickness greater than the thickest part of the inner member 140. Next, it is manufactured by precision machining using a semi-automated process in which an operator checks and adjusts the excess thickness as needed. In other words, the inner member 140 should be manufactured by precision machining the inner excess thickness so that the outside of the inner member 140 has a cylindrical shape with a straight longitudinal direction, while the inside of the inner member 140 has a cylindrical shape with a straight longitudinal direction, and the inner diameter gradually decreases from a predetermined point to a point where sludge is discharged. Thus, the inner surface of the inner member 140 has a straight cylindrical shape, and from a predetermined point, it has an inwardly tapered shape where the inner diameter gradually decreases. This allows the sludge to be pushed inward, thus reducing its water content.

[0037] The pair of fixing members 150 are fixed to both ends of the inner member 140, respectively, and fix both ends of each of the multiple reinforcing members 170 in a taut manner. They also extend along the edge of the inner member 140, acting as locking projections to prevent the first and second outer members 160 and 180 from detaching from the inner member 140. Such a pair of fixing members 150 can be made of a disc of a certain thickness with an inner diameter the same as the inner diameter of both ends of the inner member 140 and an outer diameter that protrudes to a certain height along the edge of the inner member 140. Such a pair of fixing members 150 can be fixed to both ends of the inner member 140 by methods such as bolt fastening, bolt / nut fastening, or welding. On the other hand, the pair of fixing members 150 can also be configured to have a plurality of holes 152 for fixing both ends of the plurality of reinforcing members 170 using a nut fastening method. In this case, the plurality of holes 152 are formed at equal intervals (see Figure 6).

[0038] The first outer member 160 is made of a composite material and is integrated along the outer surface of the inner member 140; the specific relationship will be described later. The multiple reinforcing members 170 are arranged on the outside of the first outer member 160 at equal intervals in the circumferential direction and longitudinally, and are fixed in a form in which both ends are stretched tightly against a pair of fixing members 150, and can be made of steel wire having a predetermined diameter. In this case, both ends of the reinforcing members 170 can be configured to have threads (not shown) that can be tightened to the pair of fixing members 150 with nuts 154. That is, by fitting both threaded portions of the reinforcing members 170 into the holes 152 of the pair of fixing members 150 and tightening them with nuts 154 to fix them to the pair of fixing members 150, the multiple reinforcing members 170 can be arranged on the outside of the first outer member 160 in a stretched form. Such multiple reinforcing members 170 serve to reinforce the strength and rigidity of the inner member 140, reduce the thickness of the inner member 140, and reduce its weight.

[0039] 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 such a way that it covers the multiple reinforcing members 170. The first and second outer members 160 and 180 are made of composite material, which is a material that combines two or more materials with different components and forms to have an effective function. Examples of components of composite material include fiber, particle, lamina, and matrix, and composite materials consisting of these elements are generally classified into layered composite materials, particle-reinforced composite materials, and fiber-reinforced composite materials (FRC). FRC is also called fiber-reinforced plastic (FRP).

[0040] The first outer member 160 is integrated along the outer surface of the inner member 140, and the second outer member 180 is integrated along the outer surface of the first outer member 160 in a manner that covers a plurality of reinforcing members 170. The first outer member 160 is basically composed of reinforcing fibers and a matrix. Here, glass fiber, carbon fiber, aramid fiber, polyester fiber, polyvinyl acrylic fiber, etc. can be used as the reinforcing fibers. For aramid fibers, Kevlar fiber (manufactured by DuPont, USA), Spectra fiber (manufactured by Honeywell, USA), Dyneema fiber (manufactured by DSM, Netherlands), etc. can be used.

[0041] Furthermore, epoxy resin, polyester resin, vinyl ester resin, polyurethane resin, etc., can be used as the matrix.

[0042] Figures 6 and 7 are process diagrams showing the manufacturing process of the cylindrical rotating body shown in Figures 3 to 5, respectively, and are process diagrams showing the process of manufacturing the cylindrical rotating body by the co-curing method. As shown in Figures 6 and 7, the cylindrical rotating body 100 of this embodiment can be manufactured by the co-curing method.

[0043] As shown in Figure 6, in order to form the first outer member 160 along the outer surface of the inner member 140, to which fixing members 150 are fixed at both ends, a prepreg 162 of a composite material having an appropriate lamination angle (0°, 45°, 90°, etc.) is wound and laminated. At this time, in order to improve the adhesion to the outer surface of the inner member 140, a separate adhesive member may be applied before winding and laminating the prepreg 162 of the composite material for forming the first outer member 160.

[0044] Subsequently, the ends of multiple reinforcing members 170, each made of steel wire with threads at both ends, are fitted into the holes 152 of a pair of fixing members 150, and secured to the pair of fixing members 150 by tightening nuts 154, thereby arranging and fixing the multiple reinforcing members 170 in a taut state on the outside of the composite material prepreg 162 that constitutes the first outer member 160. After that, in order to form the second outer member 180, composite material prepreg 182 having an appropriate lamination angle (0°, 45°, 90°, etc.) is wound and laminated around the outer surface of the composite material prepreg 162 that constitutes the first outer member 160, covering the multiple reinforcing members 170.

[0045] Subsequently, the inner member 140, in which the composite material prepregs 162 and 182 are sequentially laminated, is wrapped in a vacuum bag 190. At this time, the vacuum bag 190 is wrapped so that it is in close contact with the outer surface of the composite material prepreg 182. Then, by applying a vacuum to the vacuum bag 190, the vacuum bag 190 causes the composite material prepreg to adhere to the outer surface of the inner member 140. The inner member 140 in this state is placed in an autoclave, cured for a certain period of time, and then removed. By removing the vacuum bag 190, the cylindrical rotating body 100 of this embodiment is manufactured in which the first outer member 160, a plurality of reinforcing members 170, and the second outer member 180 are sequentially laminated on the outer surface of the inner member 140. At this time, the first and second outer members 160 and 180 are integrated with each other in a form in which a plurality of reinforcing members 170 are arranged inside them.

[0046] In another embodiment, as shown in Figure 7, multiple reinforcing fibers 164 of the same type as described above are wound along the outer surface of an inner member 140, to which fixing members 150 are fixed at both ends, in order to construct a first outer member 160. At this time, the 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. After that, the outer surface of the inner member 140 on 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 fibers 164 and the process of applying the resin 166 may be repeated multiple times. These processes complete the process for constructing the first outer member 160.

[0047] Subsequently, the ends of multiple reinforcing members 170, each made of steel wire with threads at both ends, are fitted into the holes 152 of a pair of fixing members 150, and secured to the pair of fixing members 150 by tightening nuts 154, thereby arranging and fixing the multiple reinforcing members 170 in a taut state on the outside of the resin 166 that constitutes the first outer member 160. Then, in order to construct the second outer member 180, the process is the same as that for constructing the first outer member 160, and reinforcing fibers 184 and resin 186 are wound and applied along the outer surface of the resin 166 that constitutes the first outer member 160, covering the multiple reinforcing members 170. If necessary, the process of winding the reinforcing fibers 184 and the process of applying the resin 186 may be repeated multiple times. These processes complete the process for constructing the second outer member 180.

[0048] Next, the inner member 140, to which the reinforcing fibers 164, 184 and resins 166, 186 have been sequentially wound and coated, is wrapped in a vacuum bag 190. At this time, the vacuum bag 190 is wrapped so that it is in close contact with the outer surface of the resin 186. After that, a vacuum is applied to the vacuum bag 190, causing the resins 166, 186 to fill the spaces between the reinforcing fibers 164, 184 and the multiple reinforcing members 170. The inner member 140 in this state is placed in an autoclave, cured for a certain period of time, and then removed. The vacuum bag 190 is then removed, thereby manufacturing the cylindrical rotating body 100 of this embodiment, in which the first outer member 160, the multiple reinforcing members 170, and the second outer member 180 are sequentially laminated on the outer surface of the inner member 140. At this time, the first and second outer members 160 and 180 are integrated with each other in a form in which the multiple reinforcing members 170 are arranged inside them.

[0049] Figure 8 is a cross-sectional view showing the structural relationship between the central shaft and screw blades that constitute the screw conveyor shown in Figure 2. As shown in Figure 8, the screw conveyor 300 includes a central shaft 320 and screw blades 310, and the central shaft 320 is preferably made of hollow stainless steel to reduce weight. It is even more preferable that the central shaft 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 shaft 320, which is made hollow to reduce weight, the plurality of support members 322 form columns of partition walls that divide the hollow interior in the longitudinal direction. Such a central shaft 320 is manufactured by welding together a plurality of cylinders, each having a support member 322 on one side, and in this case, the location where the sludge guide passage 400 is located can be manufactured using a cylinder having a support member 322 in a form in which the sludge guide passage 400 can be arranged.

[0050] Figure 9 is a cross-sectional view showing a modified example of the central shaft and screw blades shown in Figure 8. As shown in Figure 9, the screw conveyor 300 of this embodiment includes a central shaft 320 and screw blades 310. Preferably, the central shaft 320 consists of a hollow first central shaft 324 made of composite material and a second central shaft 326 made of plastic that surrounds the outside of the first central shaft 324 and is integrally formed with the screw blades 310. Here, the first central shaft 324 can be manufactured and integrated using a conventional method of manufacturing a cylindrical shape and a deformed part of a cylinder using composite material. The second central shaft 326 and screw blades 310 can be manufactured by molding from a plastic material such as polyurethane. On the other hand, when transporting the dewatered sludge to the sludge discharge hole 120, it is preferable to reinforce a portion of the surface of the screw blades 310 by covering it with a steel plate or to form a reinforcing layer by coating it with a separate thin film, taking into consideration the large load and friction between the inner surfaces of the cylindrical rotating body 100.

[0051] On the other hand, in manufacturing the weight-reducing centrifugal dewatering machine according to this embodiment, as shown in Figures 6 and 7, the machine is manufactured by assembling a cylindrical rotating body 100 manufactured by a simultaneous curing method so that the screw conveyor 300 is located inside the cylindrical rotating body 100, and assembling the machine by arranging the screw conveyor 300 and the cylindrical rotating body 100 inside the case 200, and then assembling the machine in a way that allows the sludge injected inside to be dewatered using centrifugal force.

[0052] The following describes the operation process of the mass-reducing centrifugal dehydrator of this embodiment, which is configured as described above. When the motor 130 for the rotating body and the motor 330 for the conveyor are activated, the cylindrical rotating body 100 and the screw conveyor 300 rotate at high speed in the same direction, but at this time, the cylindrical rotating body 100 rotates at a higher speed than the screw conveyor 300.

[0053] In this state, sludge is supplied from the sludge supply pipe 410. The supplied sludge moves along the sludge guide path 400 into the interior of the cylindrical rotating body 100, and is separated from the filtrate by centrifugal force, adhering tightly to the inner surface of the cylindrical rotating body 100 and forming a different layer. The sludge separated from the filtrate is pulled forward by the screw blades 310 and discharged to the sludge discharge hole 120 at the front end of the second cylindrical rotating body 100b, while the filtrate flows backward along the surface of the screw blades 310 and is discharged to the water outlet hole 110.

[0054] As described above, in the weight-reducing centrifugal dewatering machine, the sludge from the first cylindrical rotating body 100a is pulled forward by the screw blades 310 and moves into the second cylindrical rotating body 100b. Subsequently, the sludge is collected towards the central axis 320 due to the increasingly smaller diameter of the second cylindrical rotating body 100b and discharged through the sludge discharge hole 120.

[0055] In the embodiment described above, the inner member 140 constituting the cylindrical rotating body 100 was configured to have a straight cylindrical shape on its inside and a tapered shape in which its inner diameter gradually decreases from a predetermined point to a point where sludge is discharged. However, the inner member 140 may be deformed to have a cylindrical shape in which the outer and inner surfaces are continuously straight cylindrical. In this case, the screw conveyor 300 located inside the inner member 140 can be configured by partially deforming the size of the central axis 320 and / or the screw blades 310 to match the deformed inner member 140.

[0056] The cylindrical rotating body 100 for the weight-reducing centrifugal dewatering machine according to this embodiment has a structure in which a plurality of reinforcing members 170 are fixedly arranged inside the first and second outer members 160 and 180, which are made of a composite material and are integrated along the outer surface of the inner member 140 made of stainless steel, thereby reducing power consumption and CO2 emissions while maintaining strength and rigidity.

[0057] In this embodiment, the weight-reducing centrifugal dewatering machine is configured such that the cylindrical rotating body 100 is as described above, with the outer surface of the inner member 140 being a straight cylindrical shape in the longitudinal direction, and the inner surface of the inner member 140 being a straight cylindrical shape, and having a tapered shape in which the inner diameter gradually decreases from a predetermined point to the point where sludge is discharged. By reducing the weight of the cylindrical rotating body 100, power consumption is reduced, CO2 emissions are reduced, and strength and rigidity are maintained.

[0058] Furthermore, in this embodiment of the weight-reducing centrifugal dewatering machine, the central axis 320 of the screw conveyor 300 is constructed of hollow stainless steel, and the hollow interior is divided longitudinally and reinforced with a plurality of support members 322 that form partition walls. This reduces power consumption and CO2 emissions by reducing the weight of the screw conveyor 300, while maintaining strength and rigidity.

[0059] Furthermore, in this embodiment, the weight-reducing centrifugal dewatering machine is constructed by composing the central axis 320 of the screw conveyor 300 with a hollow first central axis 324 made of composite material and a second plastic central axis 326 that surrounds the outside of the first central axis 324 and is integrally formed with the screw blades 310. This reduces power consumption and CO2 emissions by reducing the weight of the screw conveyor 300, while maintaining strength and rigidity.

[0060] The above description, along with the accompanying drawings, details of the cylindrical rotating body for a weight-reducing centrifugal dehydrator, its manufacturing method, and the weight-reducing centrifugal dehydrator equipped therewith. However, this is merely an illustrative description of preferred embodiments of the present invention. Therefore, the present invention is not limited to the embodiments described above, and it is obvious to those with ordinary skill in the art that it can be modified and transformed in various ways without departing from the spirit and scope of the invention. Thus, such modifications or variations should also be interpreted as falling within the scope of the claims of the present invention. [Explanation of Symbols]

[0061] 100 Cylindrical Rotating Body 140 Inner component 150 Fixing member 160 First outer member 170 Reinforcement member 180 Second outer member 200 cases 300 Screw Conveyor 400 Sludge Guideway

Claims

1. A centrifugal dewatering machine is constructed that uses centrifugal force to dewater sludge injected inside, and the cylindrical rotating body for the centrifugal dewatering machine rotates more rapidly in the same direction as the screw conveyor installed inside, thereby utilizing the difference in rotational speed between the two to dewater the sludge. Stainless steel inner components, A pair of fixing members extending from both ends of the inner member in a manner that protrudes along the edge of the inner member, A first outer member made of composite material is integrated along the outer surface of the inner member, A plurality of reinforcing members are arranged on the outside of the first outer member at equal intervals in the circumferential direction and in the longitudinal direction, and are fixed in such a manner that both ends are stretched to the pair of fixing members, A second outer member made of a composite material is integrated along the outer surface of the first outer member in a manner that covers the plurality of reinforcing members, and includes: A cylindrical rotating body for a weight-reducing centrifugal dewatering machine, characterized in that the first and second outer members are integrated with each other, with the plurality of reinforcing members arranged inside them.

2. The pair of fixing members further comprises a plurality of holes for fixing each of the plurality of reinforcing members, The cylindrical rotating body for a weight-reducing centrifugal dewatering machine according to claim 1, characterized in that 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, and the threaded portions of the reinforcing members are respectively fitted into holes in the pair of fixing members and fastened with nuts to fix them to the pair of fixing members.

3. The cylindrical rotating body for a weight-reducing centrifugal dewatering machine according to claim 2, characterized in that the first and second outer members are formed by winding and curing a prepreg of a composite material, or by winding a plurality of reinforcing fibers and curing a resin covering the reinforcing fibers.

4. A method for manufacturing a cylindrical rotating body for a weight-reducing centrifugal dehydrator according to claim 2 or 3, The steps include: laminating the composite material constituting the first outer member along the outer surface of the inner member, to which the fixing members are fixed at both ends; The steps include: fitting both ends of the plurality of reinforcing members into the holes of the pair of fixing members and tightening them with nuts to position the plurality of reinforcing members on the outside of the composite material constituting the first outer member in a taut state; The steps include laminating the composite material constituting the second outer member along the outer surface of the composite material constituting the first outer member in such a way that it covers the plurality of reinforcing members with the composite material constituting the second outer member, A method for manufacturing a cylindrical rotating body for a weight-reducing centrifugal dehydrator, comprising the steps of: wrapping the inner member, which is made of sequentially laminated composite material, in a vacuum bag, placing it in an autoclave under vacuum, curing it for a certain period of time, removing it, and removing the vacuum bag to manufacture a cylindrical rotating body in which the first outer member, the plurality of reinforcing members, and the second outer member are sequentially laminated on the outer surface of the inner member.

5. A centrifugal dewatering machine comprising a cylindrical rotating body that uses centrifugal force to dewater sludge injected inside, and rotates more rapidly in the same direction as a screw conveyor installed inside, thereby utilizing the difference in rotational speed between the two to dewater the sludge, A weight-reducing centrifugal dehydrator, characterized in that the cylindrical rotating body is a cylindrical rotating body for a weight-reducing centrifugal dehydrator according to any one of claims 1 to 3.

6. The inner member has a cylindrical shape with a straight longitudinal direction on the outside and a cylindrical shape with a straight inner surface, and has a tapered shape in which its inner diameter gradually decreases from a predetermined point to a point where sludge is discharged. The weight-reducing centrifugal dewatering machine according to claim 5, characterized in that the screw conveyor includes a hollow central shaft and screw blades.

7. The weight-reducing centrifugal dewatering machine according to claim 6, characterized in that the central axis is made of hollow stainless steel and further includes a plurality of support members that divide the inside of the hollow in the longitudinal direction to form partition walls.

8. The weight-reducing centrifugal dehydrator according to claim 6, characterized in that the central axis includes a hollow first central axis made of a composite material and a second central axis made of plastic that is positioned to surround and fix the outside of the first central axis and is formed integrally with the screw blades.

9. The weight-reducing centrifugal dewatering machine according to claim 8, characterized in that a portion of the surface of the screw blades is reinforced by wrapping it with a steel plate, or by coating it with a separate thin film to further form a reinforcing layer.

10. A method for manufacturing a weight-reducing centrifugal dehydrator according to claim 5, The steps include: laminating the composite material constituting the first outer member along the outer surface of the inner member, to which the fixing members are fixed at both ends; The steps include: fitting both ends of the plurality of reinforcing members into the holes of the pair of fixing members and tightening them with nuts to position the plurality of reinforcing members on the outside of the composite material constituting the first outer member in a taut state; The steps include laminating the composite material constituting the second outer member along the outer surface of the composite material constituting the first outer member in such a way that it covers the plurality of reinforcing members with the composite material constituting the second outer member, The process involves wrapping the inner member, which is made of sequentially laminated composite material, in a vacuum bag, placing it in an autoclave under vacuum, curing it for a certain period of time, removing it, and removing the vacuum bag to manufacture a cylindrical rotating body in which the first outer member, the plurality of reinforcing members, and the second outer member are sequentially laminated on the outer surface of the inner member, and The steps include assembling the screw conveyor so that it is located inside the cylindrical rotating body, The steps include: assembling the screw conveyor and the cylindrical rotating body by arranging them inside the case, and assembling them in a way that allows the sludge injected inside to be dewatered using centrifugal force; A method for manufacturing a weight-reducing centrifugal dehydrator, characterized by including the following:

Images