Cylindrical rotating body for weight reduction type centrifugal dehydrator and weight reduction type centrifugal dehydrator

Abstract

The invention discloses a cylindrical rotating body for a weight-reducing centrifugal dehydrator and the weight-reducing centrifugal dehydrator. A cylindrical rotating body (100) according to the present invention is provided with: an inner member (140) made of stainless steel; a pair of fixing members (150) extending at both ends of the inner member so as to protrude along the edge of the inner member; a first outer member (160) integrated along the outer surface of the inner member and made of a composite material; a plurality of reinforcing members (170) disposed along the longitudinal direction on the outside of the first outer member so as to be equally spaced in the circumferential direction and fixed to the pair of fixing members with both ends thereof tightened; and a second outer member (180) formed of a composite material, the second outer member (180) being integrated along the outer surface of the first outer member so as to cover the plurality of reinforcing members. Thus, it is possible to reduce power consumption by reducing the overall weight and thereby maintain strength and rigidity while reducing CO2 emissions.

Description

Technical Field

[0001] The present invention relates to a cylindrical rotating body for a centrifugal dehydrator, and more particularly to a cylindrical rotating body for a centrifugal dehydrator which is constructed by using materials such as stainless steel and composite materials and reinforcing components, thereby maintaining strength and rigidity while reducing weight, and a manufacturing method thereof. In addition, the present invention also relates to a centrifugal dehydrator which is constructed by constructing the cylindrical rotating body in the above manner and constructing a screw conveyor in a hollow shape with a reinforcing structure, thereby maintaining strength and rigidity while reducing weight, and a manufacturing method thereof. Background Art

[0002] Currently, sewage discharged from households or projects is transported to sewage treatment plants for treatment. The sewage treatment process includes a water purification process, in which sewage is purified to a range that can activate the self-purification function of the river before being discharged into public waters such as rivers, and a sludge treatment process, in which sludge generated in the water purification process is treated through processes such as concentration and dehydration.

[0003] As one of the devices used in the sludge treatment process, the dewatering machine is used to separate the filtrate from the sludge. According to its working principle, it can be classified into belt filter press, filter press, screw filter press, centrifugal dewatering machine and electroosmotic dewatering machine, etc. Among them, the centrifugal dewatering machine is a device that uses centrifugal force to separate the filtrate from the sludge after injecting the sludge into the rotating body.

[0004] Specifically, the rotating body (outer cylinder) of the centrifugal dehydrator is provided with a uniform diameter portion extending in the front-to-back direction with a uniform diameter and a conical portion extending from the front end of the uniform diameter portion in a manner that the 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] In addition, a spiral conveyor belt is installed inside the rotating body, which rotates in the same direction as the rotating body and has a rotation speed lower than that of the rotating body. The sludge to be dehydrated will be supplied to the spiral conveyor belt, and the sludge will move to the inside of the rotating body. The sludge moved to the inside of the rotating body will be pressed against the inner side of the rotating body by the centrifugal force, and the filtrate with a relatively small density will be separated from the sludge pressed against the inner side of the rotating body. The sludge pressed against the inner side of the rotating body will be driven forward by the spiral wing of the spiral conveyor belt and discharged to the outside of the rotating body through the sludge discharge hole, while the filtrate will move backward along the surface of the spiral wing and be discharged to the outside of the rotating body through the water outlet hole.

[0006] The centrifugal dehydrator as described above has been disclosed in Korean registered patent No. 10-0877880 (solid-liquid separation type centrifugal dehydrator), Korean registered patent No. 10-1428762 (centrifugal dehydrator for sludge), Korean registered patent No. 10-1490746 (centrifugal dehydrator with improved dehydration performance) and Korean registered patent No. 10-0740608 (coagulation, concentration and centrifugal dehydration device).

[0007] In addition, the rotating body is made of stainless steel with excellent corrosion resistance, strength and rigidity. When the rotating body is manufactured using the stainless steel as described above, the stainless steel is manufactured by centrifugal casting, wherein the centrifugal casting is performed with a thickness greater than the thickness of the rotating body. For example, in the case where a rotating body with a thickness of 2 cm needs to be manufactured, a rotating body with a thickness of about 4 cm is manufactured by centrifugal casting. Next, precision machining is performed by a semi-automatic process in which the operator checks and adjusts the remaining thickness at any time. That is, uniform thickness is ensured in all parts by precision machining.

[0008] In addition, the rotating body must have a sufficient thickness to ensure that it can provide a degree of strength and rigidity that is sufficient to perform its original function normally without being deformed by external forces during operation. However, in order to manufacture a rotating body with the above conditions using stainless steel, there is a problem that the manufacturing cost including the cost of raw materials is too high. In addition, because the rotating body is manufactured using heavy stainless steel, more power is consumed during dehydration, which has a problem of increased operating costs.

[0009] According to analysis, the main reason for the rise in global average temperature since the mid-20th century is the sharp increase in the concentration of carbon dioxide (CO2) in the atmosphere due to human industrial activities. The methods of reducing CO2 in the atmosphere can be roughly divided into CO2 emission reduction and removal of emitted CO2, and the methods of reducing CO2 emissions include the use of new renewable energy and nuclear energy and the use of technologies such as energy efficiency.

[0010] Furthermore, when dehydrating with a centrifugal dehydrator, the rotating body usually rotates at 3,000 to 4,000 rpm, and the centrifugal gravity field at this time has 2,000 to 3,000G, which is about 2,000 to 3,000 times the earth's gravity (G). Since the G value in the centrifugal dehydrator is affected by weight, by reducing the weight of the rotating body and / or the spiral conveyor belt constituting the centrifugal dehydrator, not only can the fatigue applied to the product be reduced by reducing the centrifugal gravity field and thereby extending the service life of the product, but also by reducing the power consumption, it can contribute to reducing CO2 emissions. Therefore, there is an urgent need for a technology that can reduce the weight of the rotating body and / or the spiral conveyor belt constituting the centrifugal dehydrator while maintaining strength and rigidity. Summary of the invention

[0011] Therefore, the present invention aims to solve the problems existing in the prior art as described above, and its purpose is to provide a cylindrical rotating body for a lightened centrifugal dehydrator and a manufacturing method thereof, which is integrated along the outer side of an inner part made of stainless steel with an outer part made of a composite material, and has a structure having a plurality of reinforcing parts fixedly arranged in a taut form inside the outer part, thereby reducing power consumption by reducing the overall weight and thereby reducing CO2 emissions while maintaining strength and rigidity.

[0012] In addition, another object of the present invention is to provide a weight-reduced centrifugal dehydrator and its manufacturing method, which is constructed by constructing a cylindrical rotating body in the manner described above, with the outer side of the inner component being a straight cylindrical shape along the length direction, and the inner side of the inner component being a straight cylindrical shape and having a tapered shape in which the inner diameter gradually decreases from a certain position to a sludge discharge position, thereby reducing the weight of the cylindrical rotating body and reducing power consumption, thereby reducing CO2 emissions while maintaining strength and rigidity.

[0013] In addition, another object of the present invention is to provide a lightened centrifugal dehydrator and a manufacturing method thereof, wherein the central axis of the spiral conveyor belt is constructed in a hollow shape and reinforced with a plurality of supporting parts by dividing the hollow interior along the length direction to form partition walls, thereby reducing the weight of the spiral conveyor belt and reducing power consumption, thereby reducing CO2 emissions while maintaining strength and rigidity.

[0014] In addition, another object of the present invention is to provide a lightened centrifugal dehydrator and a method for manufacturing the same, which can reduce the weight of the spiral conveyor belt and reduce power consumption, thereby reducing CO2 emissions while maintaining strength and rigidity by utilizing a hollow first center axis made of a composite material and a second center axis made of a plastic material that is arranged in a form surrounding the outside of the first center axis and is integrally formed with the spiral wing to form the center axis of the spiral conveyor belt.

[0015] In order to achieve the above-mentioned object, the present invention is characterized in that: as a centrifugal dehydrator for dehydrating sludge injected into the inside by centrifugal force, the cylindrical rotating body for a centrifugal dehydrator dehydrates the sludge by rotating faster in the same direction as a spiral conveyor installed inside and utilizing the difference in rotation speed with the spiral conveyor belt to dehydrate the sludge, comprising: an inner member made of stainless steel; a pair of fixing members extending at both ends of the inner member in a state of protruding along the edge of the inner member; a first outer member integrated along the outer side surface of the inner member and composed of a composite material; a plurality of reinforcing members arranged along the length direction at equal intervals in the circumferential direction outside the first outer member and fixed to the pair of fixing members in a tightened state at both ends; and a second outer member integrated along the outer side surface of the first outer member in a state of covering the plurality of reinforcing members and composed of a composite material; the first outer member and the second outer member are integrated with each other in a state in which the plurality of reinforcing members are arranged inside.

[0016] Furthermore, in order to achieve the above-mentioned purpose, the manufacturing method of the cylindrical rotating body for a lightening-duty centrifugal dehydrator of the present invention is characterized in that it includes: a step of stacking the composite material constituting the first outer member along the outer side of the inner member to which the fixing members are respectively fixed at both ends; a step of arranging the multiple reinforcing members in a tightened form to the outside of the composite material constituting the first outer member by respectively embedding the two end portions of the multiple reinforcing members into the holes of the pair of fixing members and fastening and fixing them with nuts; a step of stacking the composite material constituting the second outer member along the outer side of the composite material constituting the first outer member in a form covering the multiple reinforcing members; and a step of putting the inner member stacked with the composite material in sequence into an autoclave in a vacuum state formed by wrapping it with a vacuum bag and taking out and removing the vacuum bag after curing it for a certain period of time, thereby manufacturing a cylindrical rotating body in which the first outer member, the multiple reinforcing members and the second outer member are stacked in sequence on the outer side of the inner member.

[0017] In addition, in order to achieve the purpose as described above, the cylindrical rotating body for the weight-reducing centrifugal dehydrator of the present invention is characterized in that: the sludge injected into the interior is dehydrated by utilizing centrifugal force, and is equipped with a cylindrical rotating body that dehydrates the sludge by utilizing the difference in rotation speed with the spiral conveyor belt installed inside by rotating faster in the same direction as the spiral conveyor belt, and the cylindrical rotating body is constructed in the manner described above.

[0018] Furthermore, in order to achieve the above-mentioned purpose, the manufacturing method of the lightening-duty centrifugal dehydrator of the present invention is characterized in that it includes: a step of stacking the composite material constituting the first outer member along the outer side of the inner member to which the fixing members are respectively fixed at both ends; a step of arranging the multiple reinforcing members in a tightened form to the outside of the composite material constituting the first outer member by respectively embedding the two end portions of the multiple reinforcing members into the holes of the pair of fixing members and fastening and fixing them with nuts; a step of using the composite material constituting the second outer member to cover the multiple reinforcing members along the outer side surface of the composite material constituting the first outer member The invention also provides a step of stacking the composite materials; putting the inner member stacked with the composite materials in sequence into an autoclave in a vacuum state formed by wrapping with a vacuum bag and curing it for a certain period of time, then taking out and removing the vacuum bag, thereby manufacturing a cylindrical rotating body in which the first outer member, the plurality of reinforcing members and the second outer member are stacked in sequence on the outer side of the inner member; the step of assembling the spiral conveyor belt in the interior of the cylindrical rotating body; and the step of arranging and assembling the spiral conveyor belt and the cylindrical rotating body inside the outer shell, wherein the arrangement and assembly are carried out in a manner that the sludge injected into the interior can be dehydrated by centrifugal force.

[0019] The present invention integrates an outer component made of composite material along the outer side of an inner component made of stainless steel, and has a structure having multiple reinforcing components fixedly arranged in a taut form inside the outer component, thereby reducing power consumption by reducing the overall weight and thereby reducing CO2 emissions while maintaining strength and rigidity.

[0020] In addition, the present invention constructs a cylindrical rotating body in the manner described above, and the outer side of the inner component is a cylindrical shape that is linear along the length direction, while the inner side of the inner component is a cylindrical shape that is linear and has a tapered shape in which the inner diameter gradually decreases from a certain position to the position where the sludge is discharged. This can reduce the weight of the cylindrical rotating body, reduce power consumption, and thereby maintain strength and rigidity while reducing CO2 emissions.

[0021] In addition, the present invention makes the central axis of the spiral conveyor belt into a hollow shape and reinforces it by means of multiple supporting parts that divide the interior of the hollow shape along the length direction to form partition walls. This can reduce the weight of the spiral conveyor belt and reduce power consumption, thereby maintaining strength and rigidity while reducing CO2 emissions.

[0022] In addition, the present invention utilizes a hollow first center axis made of a composite material and a second center axis made of a plastic material that is arranged in a form surrounding the outside of the first center axis and is integrally formed with the spiral wing to form the center axis of the spiral conveyor belt, thereby reducing power consumption by reducing the weight of the spiral conveyor belt and thereby maintaining strength and rigidity while reducing CO2 emissions. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic cross-sectional view illustrating the structural relationship of a weight-reducing centrifugal dehydrator according to one embodiment of the present invention.

[0024] Figure 2 Yes Figure 1 A schematic cross-sectional view illustrating the structural relationship between the cylindrical rotating body and the spiral conveyor belt shown in FIG.

[0025] Figure 3 Yes Figure 2 A schematic oblique view illustrating the structural relationship of the cylindrical rotating body shown in FIG.

[0026] Figure 4 as well as Figure 5 Yes Figure 3 2 are cross-sectional views of the cylindrical rotating body shown in FIG. 1 taken along line AA and line BB, respectively.

[0027] Figure 6 as well as Figure 7 Yes Figure 5 The manufacturing process of the cylindrical rotating body shown in the figure is respectively illustrated in the engineering drawings.

[0028] Figure 8 Yes Figure 2 A cross-sectional view illustrating the structural relationship between the central axis and spiral wings of the spiral conveyor belt shown in FIG.

[0029] Fig. 9 Yes Figure 8 A cross-sectional view illustrating a modification example of the central axis and the spiral blade shown in FIG.

[0030]

Explanation of symbols

[0031] 100: Cylindrical rotating body

[0032] 140: Inner parts

[0033] 150: Fixed parts

[0034] 160: First outer member

[0035] 170: Reinforcement parts

[0036] 180: Second outer part

[0037] 200: Shell

[0038] 300: Spiral conveyor belt

[0039] 400: Sludge guide channel DETAILED DESCRIPTION

[0040] Next, the preferred embodiments of the cylindrical rotating body for a weight-reducing centrifugal dehydrator and its manufacturing method, and the weight-reducing centrifugal dehydrator equipped with the cylindrical rotating body for a weight-reducing centrifugal dehydrator and its manufacturing method according to the present invention will be described in detail with reference to the accompanying drawings. The present invention is not limited to the embodiments disclosed in the following content, but can be implemented in a variety of different forms, and these embodiments are only used to more completely disclose the present invention and more completely introduce the scope of the invention to people with general knowledge.

[0041] Figure 1 is a cross-sectional schematic diagram illustrating the structural relationship of a weight-reducing centrifugal dehydrator according to one embodiment of the present invention, and Figure 2 Yes Figure 1 A schematic cross-sectional view showing the structural relationship between the cylindrical rotating body and the spiral conveyor belt shown in FIG. Figure 1 as well as Figure 2 As shown, a weight-reducing centrifugal dehydrator according to one embodiment of the present invention utilizes centrifugal force to dehydrate the sludge injected into the interior, and includes a cylindrical rotating body (hereinafter referred to as "cylindrical rotating body") 100 for a weight-reducing centrifugal dehydrator, an outer shell 220, a spiral conveyor belt 300, and a sludge guide channel 400.

[0042] The cylindrical rotating body (outer cylinder) 100 is accommodated in the interior of the housing 200, and includes: a first cylindrical rotating body 100a, which is cylindrical and has a uniform diameter with the inner side and the outer side being linear along the length direction; and a second cylindrical rotating body 100b, which is cylindrical and has a tapered shape with the outer side being linear along the length direction and the inner side being linear and the inner diameter gradually decreasing from a certain position to the position where the sludge is discharged. The first cylindrical rotating body 100a and the second cylindrical rotating body 100b as described above are preferably manufactured in an integrated form.

[0043] The first cylindrical rotating body 100a is a part having uniform inner and outer diameters and extending in the front-rear direction, and its rear end is rotatably coupled to the housing 200. In addition, a water outlet 110 for discharging the filtrate separated from the sludge is provided on the back 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 discharged to the outside of the housing 200 through the filtrate discharge port 210 provided on the housing 200.

[0044] The second cylindrical rotating body 100b is a portion extending forward from the front end of the first cylindrical rotating body 100a. As shown in the figure, it has a tapered shape with a linear shape inside and a gradually decreasing inner diameter from a certain position to the position where the sludge is discharged. By adopting the tapered shape toward the inside with the gradually decreasing inner diameter as described above, a force pushing inward can be applied to the sludge and thereby reduce the moisture content. The front end of the second cylindrical rotating body 100b as described above is rotatably coupled to the housing 200, and is equipped with a sludge discharge hole 120 for discharging the dehydrated sludge (sludge cake) to the outside. The sludge cake discharged to the outside of the second cylindrical rotating body 100b through the sludge discharge hole 120 will be discharged to the outside of the housing 200 through the sludge discharge port 220 equipped on the housing 200.

[0045] The front end of the cylindrical rotating body 100 constructed as described above is connected to the rotating body motor 130, so that when the rotating body motor 130 is in operation, the cylindrical rotating body 100 is rotated at a high speed, thereby applying a strong centrifugal force to the sludge inside the cylindrical rotating body 100. In addition, by means of the centrifugal force, the solid matter with a relatively high density will adhere to the inner side of the cylindrical rotating body 100, and the filtrate with a relatively low density will be separated from the solid matter by stratification inside the solid matter, thereby being physically separated from the solid matter.

[0046] The spiral conveyor 300 is installed inside the cylindrical rotating body 100 in order to move the sludge that is close to the inner side of the cylindrical rotating body 100 to the front (the direction where the sludge discharge hole is located), and includes a central shaft 320 and a spiral wing 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 spiral wing 310 includes a root and a tip, wherein the root is the inner end fixed to the central shaft 320, and the tip is the outer end that is a little distance away from the inner side of the cylindrical rotating body 100.

[0047] The rear end of the spiral conveyor 300 as described above is connected to the conveyor motor 330, so when the conveyor motor 330 is working, the spiral conveyor 300 will rotate at a high speed in the same direction as the cylindrical rotating body 100, but its rotation speed is lower than that of the cylindrical rotating body 100. Thereby, a speed difference will be formed between the spiral conveyor 300 and the cylindrical rotating body 100, so that the solid matter that can be closely attached to the inner side of the cylindrical rotating body 100 will be driven forward by the spiral wing 310. At this time, a space can be formed between the solid matter driven by the spiral wing 310 and the central axis 320, and with the help of the space, the filtrate will move backward along the surface of the spiral wing 310 and be discharged to the outside of the first cylindrical rotating body 100a through the water outlet 110.

[0048] The sludge guide passage 400 is provided inside the central shaft 320 in a manner extending in the front-rear direction along the center of the central shaft 320. A sludge supply pipe 410 for supplying sludge to be dehydrated is coupled to the front end of the central shaft 320 in a manner allowing the central shaft 320 to rotate, and the sludge supply pipe 410 is communicated with the front end of the sludge guide passage 400. In addition, the rear end of the sludge guide passage 400 is communicated with the interior of the first cylindrical rotating body 100a. Thus, the sludge supplied from the sludge supply pipe 410 moves backward along the sludge guide passage and further moves into the interior of the first cylindrical rotating body 100a.

[0049] As described above, in the weight-reducing centrifugal dehydrator, the sludge in the first cylindrical rotating body 100a will be driven forward by the spiral wing 310 and enter the second cylindrical rotating body 100b. Then, the sludge will gather to one side of the central axis 320 due to the gradually decreasing diameter of the second cylindrical rotating body 100b and be discharged through the sludge discharge hole 120.

[0050] Figure 3 The cylindrical rotating body shown in FIG. 1 is a cross-sectional view taken along line AA and line BB, respectively. Figure 4 as well as Figure 5 Yes Figure 3 The cylindrical rotating body shown in FIG. 1 is a cross-sectional view taken along line AA and line BB, respectively. Figures 3 to 5As shown, the first cylindrical rotating body 100a and the second cylindrical rotating body 100b of the cylindrical rotating body 100 of this embodiment are made in one piece. The cylindrical rotating body 100 as described above includes: an inner part 140 made of stainless steel; a pair of fixing parts 150 extending from both ends of the inner part 140 in a protruding shape along the edge of the inner part 140; a first outer part 160 integrated along the outer side of the inner part 140 and made of a composite material; a plurality of reinforcing parts 170 arranged along the length direction at equal intervals in the circumferential direction on the outer side of the first outer part 160 and fixed to the pair of fixing parts 150 in a tightened shape at both ends; and a second outer part 180 integrated along the outer side of the first outer part 160 in a shape covering the plurality of reinforcing parts 170 and made of a composite material. The first outer part 160 and the second outer ear part 180 are integrated with each other in a shape in which a plurality of reinforcing parts 170 are arranged inside. Furthermore, when the inner member 140 and the first outer member 160 are formed of two materials, stainless steel and a composite material, a separate bonding member may be disposed between the inner member 140 and the first outer member 160 in order to enhance the bonding strength therebetween.

[0051] The inner member 140 has a cylindrical shape with a straight outer side along the length direction, and a tapered shape with a straight inner side and an inner diameter gradually decreasing from a certain position to the position where the sludge is discharged. The inner member 140 as described above is made of stainless steel, and when the inner member 140 is made of the stainless steel, the stainless steel is centrifugally cast, wherein the centrifugation is performed with a thickness greater than the thickness of the thickest part of the inner member 140. Next, the inner member 140 is precisely machined and manufactured by a semi-automatic process in which the operator checks and adjusts the remaining thickness at any time. That is, the inner member 140 has a cylindrical shape with a straight outer side along the length direction, and the inner member 140 has a cylindrical shape with a straight inner side and a tapered shape with an inner diameter gradually decreasing from a certain position to the position where the sludge is discharged. The excess thickness of the inner side is precisely machined and manufactured. By adopting the above-mentioned inner member 140 having a straight cylindrical shape inside and a tapered shape with the inner diameter gradually decreasing from a certain position toward the inside, a force pushing inward can be applied to the sludge to reduce the moisture content.

[0052] The pair of fixing members 150 are fixed to both ends of the inner member 140, respectively, so that the multiple reinforcing members 170 can be fixed to both ends of each reinforcing member 170 in a tightened state, and can also be extended in a protruding form along the edge of the inner member 140, thereby playing the role of a barrier to prevent the first outer member 160 and the second outer member 180 from detaching to the outside of the inner member. The pair of fixing members 150 as described above can be composed of a disk with an inner diameter the same as the inner diameter of the two ends of the inner member 140 and a certain thickness and an outer diameter protruding at a certain height along the inner member 140. The pair of fixing members 150 as described above can be fixed to both ends of the inner member 140 by a method including a bolt 156 fixing method and a bolt / nut fastening method, such as welding. In addition, the pair of fixing members 150 can also be composed of a plurality of holes 152 for fixing the two ends of the multiple reinforcing members 170 in a nut fastening method. At this time, the plurality of holes 152 are formed at equal intervals (see Figure 6 ).

[0053] The first outer component 160 is made of a composite material and is integrated along the outer side surface of the inner component 140 . The specific structural relationship thereof will be described in the following content.

[0054] The plurality of reinforcing members 170 are arranged along the length direction at equal intervals in the circumferential direction on the outside of the first outer member 160 and both ends are fixed to the pair of fixing members 150 in a tight state, and can be made of steel wires with a certain diameter. At this time, both ends of the reinforcing members 170 can be formed in a manner of having threads (not shown) that can be fastened and fixed to the pair of fixing members 150 by nuts 154. That is, by respectively inserting the two threaded portions of the reinforcing member 170 into the holes 152 of the pair of fixing members 150 and then fastening and fixing to the pair of fixing members 150 by nuts 154, the plurality of reinforcing members 170 can be arranged on the outside of the first outer member 160 in a tight state. The plurality of reinforcing members 170 as described above can play a role in reducing the thickness of the inner member 140 and thereby reducing the weight by reinforcing the strength and rigidity of the inner member 140.

[0055] The second outer member 180 is made of a composite material and is integrated along the outer side surface of the first outer member 160 in a manner covering the plurality of reinforcing members 170 .

[0056] The first outer member 160 and the second outer member 180 are composed of composite materials, and composite materials refer to materials that have effective functions by combining two or more materials with different components or forms. The constituent elements of the material include fiber, particle, layer, matrix, etc., and the composite material composed of the above elements can generally be classified into layered composite materials, particle reinforced composite materials, and fiber reinforced composite materials (FRC). Fiber reinforced composite materials (FRC) are also called fiber reinforced plastics (FRP).

[0057] The first outer member 160 is integrated along the outer side of the inner member 140, and the second outer member 180 is integrated along the outer side of the first outer member 160 in the form of covering a plurality of reinforcing members 170, and is basically composed of reinforcing fibers and a matrix. Among them, as the reinforcing fibers, glass fibers, carbon fibers, aramid fibers, polyester fibers, and polyvinyl acrylic fibers can be used. As aramid fibers, Kevlar fibers (trade name, Dupont, USA), Spectra fibers (trade name, Honeywell, USA) and Dyneema fibers (trade name, DSM, Netherlands) can be used.

[0058] In addition, as the matrix, epoxy resin, polyester resin, vinyl ester resin, polyurethane resin, etc. can be used.

[0059] Figure 6 as well as Figure 7 Yes Figure 5 The engineering drawings respectively illustrating the manufacturing process of the cylindrical rotating body shown in the figure are engineering drawings illustrating the process of manufacturing the cylindrical rotating body by the simultaneous solidification method. Figure 6 as well as Figure 7 As shown, the cylindrical rotating body 100 of one embodiment can be manufactured by a simultaneous solidification method.

[0060] like Figure 6 As shown, in order to form the first outer member 160 along the outer side surface of the inner member 140 to which the fixing members 150 are respectively fixed at both ends, the composite material prepreg 162 having an appropriate stacking angle (such as 0°, 45°, and 90°, etc.) is wound and stacked. At this time, the composite material prepreg 162 for forming the first outer member 160 may be wound and stacked in a state where a separate adhesive member is applied to the outer side surface of the inner member 140 in order to improve the adhesive force.

[0061] Next, by inserting both ends of the reinforcing member 170 made of a steel wire having threads at both ends into the holes 152 of the pair of fixing members 150, and then fastening them with nuts 154 to fix them to the pair of fixing members 150, the plurality of reinforcing members 170 can be arranged and fixed in a taut state to the outside of the composite material prepreg 162 constituting the first outer member 160. Next, in order to form the second outer member 180, the composite material prepreg 182 having an appropriate stacking angle (such as 0°, 45°, and 90°) is wound around the outer side surface of the composite material prepreg 162 constituting the first outer member 160 to cover the plurality of reinforcing members 170 and stack them.

[0062] Next, the inner part 140 on which the composite material prepregs 162 and 182 are sequentially stacked is wrapped with a vacuum bag 190. At this time, the vacuum bag 190 is wrapped in a manner that it is closely attached to the outer side surface of the composite material prepreg 182. Next, a vacuum is formed in the vacuum bag 190 so that the composite material prepreg is closely attached to the outer side surface of the inner part 140 with the aid of the vacuum bag 190. By putting the inner part 140 in the above-described state into an autoclave and curing it for a certain period of time, and then taking out and removing the vacuum bag 190, the cylindrical rotating body 100 of this embodiment in which the first outer part 160, a plurality of reinforcing parts 170, and a second outer part 180 are sequentially stacked on the outer side surface of the inner part 140 can be manufactured. At this time, the first outer part 160 and the second outer ear part 180 are integrated with each other in the form of a plurality of reinforcing parts 170 arranged inside them.

[0063] As another way, Figure 7As shown, in order to form the first outer member 160 along the outer side surface of the inner member 140 to which the fixing members 150 are fixed at both ends, a plurality of reinforcing fibers 164 of the type described above are wound. At this time, the reinforcing fibers 164 are wound in multiple layers in multiple directions along the outer side surface of the inner member 140 as described above according to the specifications to be manufactured. Next, the outer side surface of the inner member 140 wound with the reinforcing fibers 164 is coated with the resin 166 of the type described above. If necessary, the process of winding the reinforcing fibers 164 and the process of coating the resin 166 as described above can be repeated multiple times. Through the process described above, the process for forming the first outer member 160 is completed.

[0064] Next, by inserting both ends of the reinforcing member 170 made of a steel wire having threads at both ends into the holes 152 of the pair of fixing members 150, and then fastening them with nuts 154 to fix them to the pair of fixing members 150, the plurality of reinforcing members 170 can be arranged and fixed in a taut state to the outside of the resin 166 constituting the first outer member 160. Next, the process of constituting the second outer member 180 is the same as the process of constituting the first outer member 160, wherein the reinforcing fiber 184 and the resin 186 are wound and applied along the outer side surface of the resin constituting the first outer member 160 in a manner covering the plurality of reinforcing members 170. The above-described process of winding the reinforcing fiber 184 and the process of applying the resin 186 can be repeated multiple times as needed. Through the above-described process, the process for constituting the second outer member 180 is completed.

[0065] Next, the inner member 140, which is sequentially wound and coated with the reinforcing fibers 164, 184 and the resins 166, 186, is wrapped with a vacuum bag 190. At this time, the inner member 140 is wound in such a way that the vacuum bag 190 is closely attached to the outer side of the resin 186. Next, a vacuum is formed in the vacuum bag 190, and the resins 166, 186 are filled between the reinforcing fibers 164, 184 and the plurality of reinforcing members 170 by means of the vacuum bag 190. By putting the inner member 140 in the above state into an autoclave and curing it for a certain period of time, and then taking it out and removing the vacuum bag 190, the cylindrical rotating body 100 of this embodiment in which the first outer member 160, the plurality of reinforcing members 170, and the second outer member 180 are sequentially stacked on the outer side of the inner member 140 can be manufactured. At this time, the first outer member 160 and the second outer ear member 180 are integrated with each other in a form in which the plurality of reinforcing members 170 are arranged inside.

[0066] Figure 8 Yes Figure 2 A cross-sectional view showing the structural relationship between the central axis and the spiral wings of the spiral conveyor belt. Figure 8 As shown, the spiral conveyor 300 includes a central shaft 320 and a spiral wing 310, and the central shaft 320 is preferably formed of a hollow stainless steel in order to reduce weight. The central shaft 320 as described above also preferably includes a plurality of support members 322 that form partition walls by dividing the hollow interior along the length direction. That is, the main body of the partition wall that divides the hollow interior along the length direction is formed by means of a plurality of support members 322, thereby reinforcing the strength and rigidity of the central shaft 320 when the central shaft 320 is formed in a hollow shape in order to reduce weight. The central shaft 320 as described above is made by welding a plurality of cylinders equipped with support members 322 on one side, and at this time, the portion where the sludge guide channel 400 is located can be made by using a cylinder equipped with a support member 322 in a shape that can be configured with the sludge guide channel 400.

[0067] Fig. 9 Yes Figure 8 A cross-sectional view showing a deformation example of the central axis and the spiral blade shown in FIG. Fig. 9 As shown, the spiral conveyor 300 of this embodiment includes a central shaft 320 and a spiral wing 310, wherein the central shaft 320 includes a hollow first central shaft 324 made of a composite material and a second central shaft 326 of a plastic material arranged in a form surrounding the outer side of the first central shaft 324 and integrally formed with the spiral wing 310. The first central shaft 324 can be manufactured and integrated in a general manner by using a composite material to make a cylinder and a partially deformed form of a cylinder. In addition, the second central shaft 326 and the spiral wing 310 can be manufactured by casting using a plastic material such as polyurethane. In addition, the spiral wing 310 is preferably reinforced by wrapping a portion of the surface of the spiral wing 310 with a steel plate or coating it with a separate film to form a reinforcement layer in consideration of the large load in the process of transferring the dehydrated sludge through the sludge discharge hole 120 and the friction between the spiral wing 310 and the inner side surface.

[0068] In addition, in the process of manufacturing the weight-reducing centrifugal dehydrator according to this embodiment, as Figure 6 as well as Figure 7 As shown, a process of assembling the spiral conveyor belt 300 in a manner such that the spiral conveyor belt 300 is arranged inside a cylindrical rotating body 100 manufactured by a simultaneous solidification method, and a process of assembling the spiral conveyor belt 300 and the cylindrical rotating body 100 in a manner such that the sludge injected into the interior can be dehydrated by utilizing centrifugal force.

[0069] Next, the operation of the weight-reducing centrifugal dehydrator of this embodiment constructed as described above will be described.

[0070] When the rotating body motor 130 and the conveyor belt motor 330 are working, the cylindrical rotating body 100 and the spiral conveyor belt 300 will rotate at high speed in the same direction. At this time, the rotation speed of the cylindrical rotating body 100 will be greater than the rotation speed of the spiral conveyor belt 300.

[0071] In the above state, sludge is supplied from the sludge supply pipe 410. The supplied sludge moves along the sludge guide channel 400 to the inside of the cylindrical rotating body 100, and adheres to the inner side of the cylindrical rotating body 100 by centrifugal force, so as to be stratified and separated from the filtrate. The sludge separated from the filtrate is brought forward by the spiral wing 310 and discharged through the sludge discharge hole 120 at the front end of the second cylindrical rotating body 100b, while the filtrate flows along the surface of the spiral wing 310 and is discharged through the water outlet hole 110.

[0072] As described above, in the weight-reducing centrifugal dehydrator, the sludge in the first cylindrical rotating body 100a will be driven forward by the spiral wing 310 and enter the second cylindrical rotating body 100b. Then, the sludge will gather to one side of the central axis 320 due to the gradually decreasing diameter of the second cylindrical rotating body 100b and be discharged through the sludge discharge hole 120.

[0073] In the embodiment described above, the inner side of the inner part 140 constituting the cylindrical rotating body 100 is a straight cylindrical shape, and the inner diameter gradually decreases from a certain position to the position where the sludge is discharged. However, the inner part 140 can also be deformed into a cylinder composed of the outer side and the inner side of the inner part 140 being a continuous straight cylindrical shape. In the above case, it is only necessary to adopt a structure in which the size of the central axis 320 and / or the spiral wing 310 is partially deformed so that the spiral conveyor 300 located inside the inner part 140 fits the inner part 140.

[0074] According to the cylindrical rotating body 100 for a weight-reducing centrifugal dehydrator of the present embodiment, a first outer part 150 and a second outer part 180 made of composite materials are integrated along the outer side of an inner part 140 made of stainless steel, and a plurality of reinforcing parts 170 are fixedly arranged in a taut form inside the first outer part 160 and the second outer part 180, thereby maintaining strength and rigidity while reducing CO2 emissions by reducing the overall weight.

[0075] According to the weight-reducing centrifugal dehydrator of the present embodiment, the cylindrical rotating body 100 is constructed in the manner as described above, and the outer side of the inner part 140 is a straight cylindrical shape along the length direction, while the inner side of the inner part 140 is a straight cylindrical shape and is constructed in a conical shape with an inner diameter gradually decreasing from a certain position to the position where the sludge is discharged. This can reduce the weight of the cylindrical rotating body 100, thereby reducing power consumption and maintaining strength and rigidity while reducing CO2 emissions.

[0076] In addition, according to the weight-reducing centrifugal dehydrator of this embodiment, the central axis 320 of the spiral conveyor belt 300 is formed by using hollow stainless steel, and is reinforced by means of multiple supporting parts 322 that divide the hollow interior along the length direction to form partition walls. This can reduce the weight of the spiral conveyor belt 300, reduce power consumption, and thereby maintain strength and rigidity while reducing CO2 emissions.

[0077] In addition, according to one embodiment of a weight-reducing centrifugal dehydrator, the center axis 320 of the spiral conveyor belt 300 is formed by using a hollow first center axis 324 made of a composite material and a second center axis 326 made of a plastic material that is configured in a form surrounding the outer side of the first center axis 324 and is integrally formed with the spiral wing 310, thereby reducing the weight of the spiral conveyor belt 300, thereby reducing power consumption and maintaining strength and rigidity while reducing CO2 emissions.

[0078] In the above content, the cylindrical rotating body for a weight-reducing centrifugal dehydrator and its manufacturing method, and the weight-reducing centrifugal dehydrator equipped with the cylindrical rotating body for a weight-reducing centrifugal dehydrator and its manufacturing method are described in detail in conjunction with the accompanying drawings, but this is only an exemplary description of the best embodiment of the present invention. Therefore, a person with general knowledge in the technical field should understand that the present invention is not limited to the embodiments described in the above content, but can be modified and deformed in various ways without departing from the idea and scope of the present invention, and the above-mentioned variations or modifications should be understood to be included in the scope of the claims of the present invention.

Claims

1. A cylindrical rotating body for a weight-reducing centrifugal dehydrator, characterized in that: A cylindrical rotating body for a centrifugal dehydrator, which is used to constitute a centrifugal dehydrator for dehydrating sludge injected therein by utilizing centrifugal force and dehydrating the sludge by utilizing the difference in rotation speed between the spiral conveyor installed therein and the spiral conveyor and the rotating body, comprising: The inner parts are made of stainless steel; A pair of fixing members extending from both ends of the inner member in a protruding manner along the edge of the inner member; a first outer member, which is integrated along the outer side surface of the inner member and is made of a composite material; a plurality of reinforcing members, which are arranged along the longitudinal direction at equal intervals in the circumferential direction on the outside of the first outer member and whose both ends are fixed to the pair of fixing members in a tightened state; and A second outer member is formed of a composite material and is integrated along the outer side surface of the first outer member so as to cover the plurality of reinforcing members; The first outer member and the second outer member are integrated with each other in a form in which the plurality of reinforcing members are arranged therein.

2. The cylindrical rotating body for a weight-reducing centrifugal dehydrator according to claim 1, characterized in that: The pair of fixing members further includes a plurality of holes for fixing the two ends of the plurality of reinforcing members respectively. The plurality of reinforcing members are configured to have threads at both ends for being fastened and fixed to the pair of fixing members by nuts, and are respectively fixed to the pair of fixing members by fastening them with nuts after the two threaded portions of the reinforcing members are respectively embedded in the holes of the pair of fixing members.

3. The cylindrical rotating body for a weight-reducing centrifugal dehydrator according to claim 2, characterized in that: The first outer member and the second outer member are formed by winding a composite material prepreg and curing it, 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, characterized in that: The method for manufacturing a cylindrical rotating body for a weight-reducing centrifugal dehydrator according to claim 2 or claim 3 comprises: A step of laminating a composite material constituting the first outer member along an outer surface of the inner member to which the fixing members are fixed at both ends; The step of placing the plurality of reinforcing members in a tightened state outside the composite material constituting the first outer member by respectively inserting both end portions of the plurality of reinforcing members into the holes of the pair of fixing members and fastening and fixing them with nuts; The step of laminating the composite material constituting the second outer member along the outer side surface of the composite material constituting the first outer member in a manner covering the plurality of reinforcing members; and The step of placing the inner component on which the composite materials are sequentially stacked in a vacuum state by wrapping it with a vacuum bag into an autoclave and curing it for a certain period of time, then taking out and removing the vacuum bag, thereby manufacturing a cylindrical rotating body in which the first outer component, the plurality of reinforcing components and the second outer component are sequentially stacked on the outer side surface of the inner component.

5. A weight-reducing centrifugal dehydrator, characterized in that: A centrifugal dehydrator equipped with a cylindrical rotating body that dehydrates the sludge injected into the inside by utilizing centrifugal force and dehydrates the sludge by utilizing the difference in rotation speed between the spiral conveyor installed inside and the spiral conveyor, 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 lightening type centrifugal dehydrator according to claim 5, characterized in that: The inner member has a cylindrical shape with a straight outer side along the length direction, and a conical shape with a straight inner side and an inner diameter gradually decreasing from a certain position to a position where the sludge is discharged. The spiral conveyor belt comprises a hollow central shaft and spiral wings.

7. The lightening type centrifugal dehydrator according to claim 6, characterized in that: The central shaft is made of hollow stainless steel and further includes a plurality of support members that divide the hollow interior along the length direction to form partition walls.

8. The lightening type centrifugal dehydrator according to claim 6, characterized in that: The central shaft includes a first central shaft of a hollow shape made of a composite material and a second central shaft of a plastic material arranged to surround and be fixed to the outside of the first central shaft and formed integrally with the spiral blade.

9. The lightening type centrifugal dehydrator according to claim 8, characterized in that: The reinforcing layer is formed by wrapping a portion of the surface of the spiral wing with a steel plate for reinforcement or by coating with a separate film.

10. A method for manufacturing a weight-reducing centrifugal dehydrator, characterized in that: As a manufacturing method of a weight-reducing centrifugal dehydrator according to claim 5, the method comprises: A step of laminating a composite material constituting the first outer member along an outer surface of the inner member to which the fixing members are fixed at both ends; The step of placing the plurality of reinforcing members in a tightened state outside the composite material constituting the first outer member by respectively inserting both end portions of the plurality of reinforcing members into the holes of the pair of fixing members and fastening and fixing them with nuts; A step of laminating the composite material constituting the second outer member along the outer side surface of the composite material constituting the first outer member in a manner covering the plurality of reinforcing members; The steps of placing the inner member on which the composite materials are sequentially stacked in a vacuum state by wrapping it with a vacuum bag into an autoclave and curing it for a certain period of time, then taking out and removing the vacuum bag, thereby manufacturing a cylindrical rotating body in which the first outer member, the plurality of reinforcing members and the second outer member are sequentially stacked on the outer side surface of the inner member; and The step of assembling in such a way that the spiral conveyor is located inside the cylindrical rotating body; and, The spiral conveyor and the cylindrical rotating body are arranged and assembled inside the housing, wherein the arrangement and assembly are performed in a manner that the sludge injected into the interior can be dehydrated by utilizing centrifugal force.

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