Variable helical stack structure

Abstract

The present invention relates to a variable helical stack structure in which a plurality of layers having a unit cell lattice structure are rotatably coupled to a rotary shaft member so that each of the layers can be rotated at a predetermined arbitrary angle to form various patterns, the variable helical stack structure being characterized by comprising: a rotary center part; and a plurality of layers which have a unit cell lattice structure, are arranged stacked in the longitudinal direction of the rotary center part, and are rotatably coupled to the rotary center part, wherein each of the layers can be rotated at a predetermined angle around the rotary center part.

Description

Variable helical laminate structure

[0001] The present invention relates to a helical laminated structure having a lattice structure, and more particularly, to a variable helical laminated structure in which a plurality of layers having a unit cell lattice structure are rotatably coupled to a rotation center and each layer can be rotated at a preset arbitrary angle to have various patterns.

[0002] The existing developed microlattice has a structure having one unit cell, and the unit cell is composed of a structure including at least one unit cell among lattice structures in which lattice members are spatially connected, such as BBC, BCCz, FCC, FCCz, PFCC, F2BCC, FBCCz (FCC+BCC+z), FBCCXYZ (FCC+BCC+XYZ), Otect-truss, Kelvin, cubic, hexagonal, Otect, kagome, octahedron, dodecahedron, and TPMS (triply periodic minimal surface).

[0003] However, the conventional microlattice lattice structure described above is manufactured only in a pre-designed shape, and after manufacturing, the shape cannot but be fixed.

[0004] The object of the present invention is to provide a new type of invention that can replace the conventional lattice structure described above and can produce a helical structure having various lattice patterns depending on the intended use of the lattice structure.

[0005] A variable helical laminated structure according to the present invention comprises a rotation center; and a plurality of layers having a unit cell lattice structure, the layers being laminated in the longitudinal direction of the rotation center and being rotatably coupled to the rotation center; wherein each of the layers is characterized in that it can be rotated at a preset angle around the rotation center.

[0006] According to one embodiment of the present invention, the rotation center is characterized by including a first gear portion having a ring shape, the outer circumference of which is connected to the unit cell and the inner circumference of which has a first gear tooth; a second gear portion disposed at the center of the first gear portion and having a second gear tooth on the outer circumference; and a third gear portion gear-engaged with the first gear portion and the second gear portion.

[0007] In addition, according to one embodiment of the present invention, a shaft is formed at the center of the second gear portion so as to penetrate each layer and is fixed to the second gear portion.

[0008] In addition, according to one embodiment of the present invention, the number of gear teeth of the first gear part of each rotation center, the number of gear teeth of the second gear part, or the number of gear teeth of the third gear part in neighboring layers among the layers is set differently from each other.

[0009] In addition, according to one embodiment of the present invention, the rotation center is formed in the internal space of the unit cell, and the rotation center and the unit cell are connected to each other by an auxiliary member.

[0010] Meanwhile, according to one embodiment of the present invention, the rotation center includes a ring portion connected to the unit cell and having a first magnetic body fixedly disposed on the inner surface thereof; and a shaft located on the inner side of the ring portion and having a second magnetic body fixedly disposed on the outer surface thereof, the first magnetic body and the second magnetic body being capable of exerting a magnetic force, wherein the first magnetic body and the second magnetic body are characterized in that they are electromagnets.

[0011] In addition, according to one embodiment of the present invention, the first magnetic body and the second magnetic body are each composed of a plurality of pieces and are arranged in a circumferential direction with respect to the center of the ring portion.

[0012] In addition, according to one embodiment of the present invention, the first magnetic body and the second magnetic body are arranged in a position facing each other, but are characterized in that they are capable of contacting each other.

[0013] In addition, according to one embodiment of the present invention, the facing surfaces of the first magnetic body and the second magnetic body are formed with the same curvature.

[0014] In addition, according to one embodiment of the present invention, the magnetic force acting between the first magnetic body and the second magnetic body is greater than the frictional force acting between the first magnetic body and the second magnetic body.

[0015] In addition, according to one embodiment of the present invention, when electricity is applied to the first magnetic body and the second magnetic body, the ring part is characterized in that it rotates until the first magnetic body and the second magnetic body to which electricity is applied are arranged on the same radial line with respect to the center of the ring part.

[0016] In addition, according to one embodiment of the present invention, the rotation center is characterized in that it is formed at the center of the internal space of the unit cell, at the corner of the unit cell, or at the center of the side forming the unit cell.

[0017] In addition, according to one embodiment of the present invention, when the layers are rotated and laminated at a certain angle, the more layers there are until layers having the same grid pattern are laminated, the more complex the grid pattern appears when viewed from the stacking direction.

[0018] Additionally, according to one embodiment of the present invention, the rotation center is characterized in that it is formed at the center of each layer.

[0019] Additionally, according to one embodiment of the present invention, the rotation center is formed at a position spaced a certain distance from the center of each layer.

[0020] According to the present invention, a structure having various lattice patterns can be formed by rotating a plurality of layers having various unit cell lattice structures around a center of rotation.

[0021] Additionally, according to the present invention, it is possible to rotate each layer at a desired angle by means of a planetary gear or an electromagnet.

[0022] In addition, according to the present invention, compared to existing microlattice structures, there is an advantage in that the surface area is large in the same volume and various shapes can be formed depending on the rotation angle of the layer.

[0023] In addition, according to the present invention, when used as a filter, only fine particles smaller than a certain size are selectively captured, thereby preventing pressure drop from decreasing, and thus providing better performance and longer lifespan than conventional filters.

[0024] In addition, according to the present invention, since it has a micro-lattice structure, it is very light, has high specific strength, and can flexibly absorb external impacts, so it can be used in various industrial fields such as internal materials of airplanes, shock absorbing equipment such as heat and vibration damping, battery electrodes and catalysts, and structural reinforcement in automobile and aviation airport fields.

[0025] In addition, according to the present invention, when used as a filter, the adhered fine dust can be washed away using a washing solution or the like, so that it can be reused.

[0026] FIG. 1 is a side view of a variable helical laminate structure according to one embodiment of the present invention.

[0027] FIG. 2 is a drawing of a helical laminated structure having a lattice structure according to the present invention as viewed from above.

[0028] Figure 3 is a drawing showing various forms of layers according to the present invention.

[0029] FIG. 4 is an enlarged view of the X portion shown in FIG. 2, and is a drawing for explaining a rotation mechanism of a layer according to one embodiment of the present invention.

[0030] Figure 5 is a drawing showing a modified example in which the rotation center of the present invention is formed in a layer.

[0031] FIG. 6 is a drawing for explaining a rotation mechanism of a layer according to another embodiment of the present invention.

[0032] Figure 7 is a drawing showing the positions where the center of rotation can be located in various unit cell shapes.

[0033] Figure 8 is a drawing showing various formation positions of the center of rotation in a specific unit cell shape.

[0034] Figure 9 is a drawing showing the rotated state of each layer according to the present invention.

[0035] Figure 10 is a drawing showing a state in which each layer illustrated in Figure 9 is stacked.

[0036] Figures 11 to 14 are drawings showing a state in which each layer of a variable helical laminated structure according to the present invention is rotated at a certain angle.

[0037] FIG. 15 is a drawing showing a state in which a rotation axis member is formed at a position spaced a certain distance from the center of the layer in a variable helical stacked structure according to the present invention.

[0038] Fig. 16 is a graph showing the compressive strength of a helical laminated structure having a lattice structure according to one embodiment of the present invention.

[0039] Hereinafter, with reference to the attached drawings, a variable helical laminate structure according to an embodiment of the present invention according to a preferred embodiment will be described in detail. Herein, the same reference numerals are used for the same components, and a detailed description of well-known functions and components that may unnecessarily obscure the gist of the invention will be omitted. The embodiments of the invention are provided to more completely explain the present invention to those of ordinary skill in the art. Therefore, the shapes and sizes of elements in the drawings may be exaggerated for a clearer description.

[0040] FIG. 1 is a side view of a variable helical laminate structure according to the present invention, FIG. 2 is a top view of a helical laminate structure having a lattice structure according to the present invention, and FIG. 3 is a view showing various forms of layers according to the present invention.

[0041] As illustrated in FIG. 1, a variable helical laminate structure according to one embodiment of the present invention includes a plurality of layers (layers, 100) and a rotation center (120) connected in the stacking direction of the layers (100).

[0042] A plurality of layers (100) have a structure in which they are sequentially stacked and arranged. Specifically, as illustrated in FIG. 1, the first layer (100_1) to the n-th layer (100_n) are stacked and arranged, and a shaft (201) is connected to each layer (100) in the stacking direction (the longitudinal direction of the rotational shaft member). Here, as illustrated in FIG. 1, each layer (100) connected to the shaft (201) may be formed to be spaced apart from each other by a certain distance. Alternatively, according to an embodiment, each layer (100) may be formed to be in contact with each other.

[0043] The layer (110) is composed of a unit cell lattice structure. As illustrated in FIG. 2, in one embodiment of the present invention, the unit cell lattice structure may have a rectangular mesh structure having an internal space (S).

[0044] Meanwhile, the layer (100) may have various unit cell lattice structures. The layer (100) illustrated in (a) of FIG. 3 has a cubic monolith structure (the same structure as the structure illustrated in FIG. 2), the layer (100) illustrated in (b) of FIG. 3 has a hexagonal monolith structure, the layer (100) illustrated in (c) of FIG. 3 has a triangle monolith structure, and the layer (100) illustrated in (d) of FIG. 3 has a reentrant monolith structure.

[0045] Of course, the unit cell lattice structure of the layer (100) according to the present invention is not limited to the above-described form. The shape or number of the unit cells of the layer (100), the overall shape, thickness, etc. of the layer (100) may be formed in various ways depending on the intended use of the structure according to the present invention or the intention of the designer.

[0046] Meanwhile, depending on the embodiment, each layer (100) may have the same unit cell lattice structure, some layers (100) may have the same unit cell lattice structure and other layers (100) may have different unit cell lattice structures, or all layers (100) may have different unit cell lattice structures.

[0047] FIG. 4 is a drawing for explaining a rotation mechanism of a layer according to one embodiment of the present invention.

[0048] As described above, each layer (100) can be arranged at a certain distance apart from each other in the stacking direction of each layer (100) (or the longitudinal direction of the shaft) based on the rotation center (120). In addition, the layers (100) connected to the rotation center (120) can each rotate around the rotation center (120). Hereinafter, the mechanism by which each layer (100) rotates will be described with reference to FIG. 4. Meanwhile, FIG. 4 is a drawing of the layer (100) viewed from above.

[0049] According to one embodiment of the present invention, a rotation mechanism may use a planetary gear system.

[0050] As illustrated in FIG. 2, a rotation center (120) may be formed in each layer (100). The rotation center (120) may be formed at any location in each layer (100), but in the exemplary embodiment illustrated in FIGS. 2 and 4, it is described that the rotation center (120) is formed at a location where the grid members (101) of the layers (100) meet.

[0051] As illustrated in FIG. 4, the rotation center (120) may include a first gear portion (210), a second gear portion (220), and a third gear portion (230).

[0052] The first gear portion (210) may include a ring portion (212) formed in an annular shape. The first gear portion (210) may be a ring gear. A rotation space (P) may be formed inside the first gear portion (210). The gear portion (210) may be formed at a point where the grid members (101) intersect. The ring portion (212) of the first gear portion (210) or the outer circumferential surface of the first gear portion (210) may be connected to the grid member (101). On the inner circumferential surface of the first gear portion (210), a first gear tooth (G1) may be formed along the circumferential direction while facing the central axis (C1) of the first gear portion (210). The first gear tooth (G1) may have various shapes such as a trapezoid, a square, and a triangle. In addition, there is no limitation on the number of the first gear teeth (G1).

[0053] A second gear part (220) may be arranged at the center of the rotation space (P) of the first gear part (210). The second gear part (220) may have an approximately circular shape. On the outer surface of the second gear part (220), a second gear tooth (G2) may be formed along the circumferential direction with respect to the central axis (C2) of the second gear part (220). The second gear tooth (G2) may have various shapes such as a trapezoid, a square, a triangle, etc. In addition, there is no limitation on the number of second gear teeth (G2).

[0054] A shaft (201) may be formed at the center of the second gear unit (220). The shaft (201) and the second gear unit (220) may be fixed to each other. Therefore, when the shaft (201) rotates, the second gear unit (220) may also rotate. Meanwhile, in one embodiment of the present invention, the first gear unit (210) and the second gear unit (220) may have the same central axis (C1).

[0055] In the above rotation space (P), a third gear portion (230) may be arranged between the first gear portion (210) and the second gear portion (220) to mesh with the first gear portion (210) and the second gear portion (220). The third gear portion (230) may have an approximately circular shape. On the outer surface of the third gear portion (230), a third gear tooth (G3) may be formed along the circumferential direction with respect to the center of the third gear portion (220). The third gear tooth (G3) may mesh with the first gear tooth (G1) and the second gear tooth (G2). The third gear tooth (G3) may have various shapes, such as a trapezoid, a square, and a triangle. In addition, there is no limitation on the number of third gear teeth (G3).

[0056] Meanwhile, although FIG. 4 illustrates that one third gear portion (230) is formed in the rotation space (P), there is no limitation on the number of third gear portions (230). Even when a plurality of third gear portions (230) are formed, the gear teeth of each third gear portion can mesh with the first gear portion (210) and the second gear portion (220).

[0057] Looking at the rotation mechanism of the layer (100) according to the above-described configuration, when the shaft (201) rotates, the second gear part (220) can rotate in one direction (for example, the clockwise direction shown in FIG. 4) around its central axis (C1). Then, the third gear part (230) meshed with the second gear part (220) can rotate in another direction (for example, the counterclockwise direction shown in FIG. 4) around its central axis (C2). Then, the first gear part (230) meshed with the third gear part (230) can rotate in one direction (for example, the clockwise direction shown in FIG. 4) around its central axis (C1). The shaft (201), which is an input shaft, can be rotated manually or automatically.

[0058] Meanwhile, in one embodiment of the present invention, the first gear portion (210), the second gear portion (220), and the third gear portion (230) described above may be formed at each rotation center portion (120) of each layer (100). In addition, by changing the number of the first gear teeth (G1), the second gear teeth (G2), and the third gear teeth (G3) formed in each layer (100), the degree to which each layer (100) rotates around the shaft (201) may be set to be different from each other.

[0059] The rotation mechanism using the planetary gear method described above can be applied identically or differently to each layer.

[0060] Figure 5 is a drawing showing a modified example in which the rotation center of the present invention is formed in a layer.

[0061] The rotation center (120) described in FIGS. 2 and 4 is formed at the point where the grid members (101) meet each other. However, as illustrated in FIG. 5, when the rotation center (120) is formed in the internal space (S) between the grid members (101), an auxiliary member (107) may be formed so as to be connected to the rotation center (120) (more specifically, the outer surface of the first gear member (210)). The auxiliary member (107) may be formed to extend from each grid member (101). In FIG. 5, a plurality of auxiliary members (107) are connected to the rotation center (120) in a cross shape, but there is no limitation on the number of auxiliary members (107) formed and the positions at which they are connected to each grid member (101).

[0062] FIG. 6 is a drawing for explaining a rotation mechanism of a layer according to another embodiment of the present invention.

[0063] According to another embodiment of the present invention, a rotation mechanism may be an electromagnet type.

[0064] FIG. 6 illustrates a rotation center (120) according to another embodiment of the present invention, and this rotation center (120) can be applied to each layer (100). Accordingly, the position of the rotation center (120) formed in the layer (100) can be referred to as described above.

[0065] A rotation center (120) according to another embodiment of the present invention may include a ring portion (212). The ring portion (212) may be connected to the grid member (101) or the auxiliary member (107) of the layer (100) illustrated in FIGS. 3 to 5. On the inner surface of the ring portion (212), a plurality of first magnetic bodies (M1) may be formed so as to be arranged along the circumferential direction while facing the central axis (C1) of the ring portion (212). The first magnetic bodies (M1) may be configured as magnetic bodies and may be configured as electromagnets. Therefore, when electricity is selectively applied to each first magnetic body (M1), a magnetic force may be generated in the corresponding first magnetic body (M1). The first magnetic bodies (M1) may be fixed to the ring portion (212).

[0066] The first magnetic bodies (M1) may be arranged adjacent to each other along the inner circumference of the ring portion (212). In one embodiment of the present invention, the first magnetic bodies (M1) may be formed such that the width of the side facing the ring portion (212) (the first-first width) is greater than the width of the opposite side (the first-second width) so as to be arranged along the entire inner circumference of the ring portion (212). At this time, the curvature of the side of the first magnetic bodies (M1) facing the ring portion (212) and the opposite side may be formed to be the same. However, there is no limitation on the number, formation position, or shape of the first magnetic bodies (M1) formed on the inner circumference of the ring portion (212). A certain distance is formed between adjacent first magnetic bodies (M1), so that each first magnetic body (M1) can be distinguished.

[0067] A shaft (201) may be arranged on the inner central portion of the ring portion (212). The central axis (C1) of the shaft (201) may coincide with the central axis (C1) of the ring portion (212). On the outer circumferential surface of the shaft (212), a plurality of second magnetic bodies (M2) may be formed along the circumferential direction based on the central axis (C1). The second magnetic bodies (M2) may have a magnetic structure and may be configured as electromagnets. Therefore, when electricity is selectively applied to each second magnetic body (M2), a magnetic force may be generated in the corresponding first magnetic body (M1). The second magnetic bodies (M2) may be fixed to the shaft (201).

[0068] In one embodiment of the present invention, the second magnetic body (M2) may be formed so that the width of the side facing the shaft (201) (the second-1 width) is smaller than the width of the opposite side (the second-2 width) so that it is arranged around the entire outer circumference of the shaft (201). At this time, the curvature of the side facing the shaft (201) and the opposite side may be formed to be the same. However, there is no limitation on the number, formation position, or shape of the second magnetic bodies (M2) formed on the outer circumference of the shaft (201). A certain distance is formed between adjacent second magnetic bodies (M2), so that each second magnetic body (M1) can be distinguished.

[0069] The first magnetic body (M1) and the second magnetic body (M2) can be formed in the same number. Each of the first magnetic body (M1) and each of the second magnetic bodies (M2) can have a posture in which they face each other. At this time, the first-second width of the first magnetic body (M1) and the second-second width of the second magnetic body (M2) described above can have the same size and curvature.

[0070] The first magnetic body (M1) and the second magnetic body (M2) can be in contact with each other. A line (B) where the first magnetic body (M1) and the second magnetic body (M2) are in contact with each other is illustrated in Fig. 6. When the first magnetic body (M1) and the second magnetic body (M2) are in contact with each other and rotate relative to each other, a frictional force can be applied.

[0071] The first magnetic body (M1) and the second magnetic body (M2) may be arranged on the same line (radial line, for example, the first to third lines illustrated in FIG. 6) in the radial direction based on the central axis (C1) depending on the rotational state. Here, the radial line may mean an imaginary line passing through the centers of the first and second magnetic bodies (M1, M2) that are completely opposite to each other. As illustrated in FIG. 6, the first magnetic body (M1) and the second magnetic body (M2) may be arranged on the first line (L1), and the first magnetic body (M1) and the second magnetic body (M2) may be arranged on the second line (L2) or the third line (L3) formed at a position spaced apart from the first line in the circumferential direction. At this time, the angle between the first line (L1) and the second line (L2) may be X˚, and the angle between the first line (L1) and the third line (L3) may be 2X˚. In one embodiment of the present invention, the angle between neighboring radial lines may be X˚.

[0072] The rotation mechanism of the layer (100) according to the above-described configuration will be examined. Here, since the ring portion (212) is connected to the layer (100) as described above and can rotate integrally, the description will focus on the ring portion (212). When no electricity is applied to the first and second magnetic bodies (M1, M2), a magnetic force may not be applied between the first and second magnetic bodies (M1, M2). In this state, as illustrated in (a) of FIG. 6, when electricity is applied to the first magnetic body (M1) arranged on the first line (L1) and when electricity is applied to the second magnetic body (M1) arranged on the second line (L2) adjacent to the first line (L1), the first magnetic body (M1) and the second magnetic body (M2) become close to each other by attractive force. Then, the shaft (201) or the ring portion (211) can rotate in a direction that makes them closer to each other based on the central axis (C1). For example, assuming that the shaft (201) is fixed, the ring portion (212) can rotate until the second magnetic body (M2) located on the second line (L2) matches the first line (L1). At this time, when the ring portion (212) is located on the first line (L1), the first magnetic body (M1) and the second magnetic body (M2) to which electricity is applied take a posture of facing each other and do not rotate any more. In this case, as a result, the ring portion (212) and the layer (100) rotate by X˚.

[0073] In addition, as shown in (b) of FIG. 6, when electricity is applied to the first magnetic body (M2) positioned on the first line (L1) and the second magnetic body (M2) positioned on the third line (L3) while no electricity is applied to the first and second magnetic bodies (M1, M2), the ring portion (211) and the layer (100) connected thereto rotate around the central axis (C1), and as a result, the ring portion (212) and the layer (100) rotate by 2X˚ according to the above-described principle.

[0074] Meanwhile, as described above, the first magnetic body (M1) and the second magnetic body (M2) can be in contact with each other. Therefore, a frictional force due to rotation can be applied at the contact line (B) between the first magnetic body (M1) and the second magnetic body (M2). In one embodiment of the present invention, the attractive force between the first magnetic body (M1) and the second magnetic body (M2) to which electricity is applied can be set to be greater than the frictional force.

[0075] According to one embodiment of the present invention, the rotation angle of the layer (100) can be adjusted by applying electricity to the first and second magnetic bodies (M1, M2) located in different radial lines according to the rotation mechanism according to the above-described electromagnet method.

[0076] Meanwhile, the rotation mechanism using the electromagnet described above can be applied identically or differently to each layer.

[0077] In addition, if the neighboring layers (100) are in contact with each other, the force for driving each layer (100) in the rotation mechanism using the planetary gear method or electromagnet may be greater than the contact frictional force between the neighboring layers (100).

[0078] Figure 7 is a drawing showing the positions where the center of rotation can be located in various unit cell shapes.

[0079] FIG. 7 illustrates a case where the unit cell of a layer (100) is triangular ((a) of FIG. 7), square ((b) of FIG. 7), and hexagonal ((c) of FIG. 7), and the position of the center of rotation (120) in each unit cell shape is illustrated. The center of rotation (120) can be located at the center of gravity in each unit cell. At this time, since the center of rotation (120) is located in the internal space (S) of the lattice member (101), an auxiliary member can be used.

[0080] Meanwhile, when each layer (100) shown in FIG. 7 is laminated, when rotating around the shaft through the above-described rotation mechanism, the number of layers of layers laminated until a lattice pattern such as a specific layer is formed based on the lamination direction varies depending on the shape and rotation angle of the unit cell. At this time, a layer having a triangular unit cell must rotate up to 120 xn degrees, a layer having a square unit cell must rotate up to 90 xn degrees, and a layer having a hexagonal unit cell must rotate up to 60 xn degrees. Specifically, the number of layers that can form the same lattice pattern according to the rotation angle of each layer is as follows [Table 1].

[0081] Unit cell shape Rotation angle 5˚10 ˚20 ˚30 ˚40 ˚50 ˚60 ˚Triangle 2412643122Square 18993993Hexagon 12632361

[0082]

[0083] Figure 8 is a drawing showing various formation positions of the center of rotation in a specific unit cell shape.

[0084] In FIG. 8, in a layer (100) having a specific unit cell (e.g., a hexagonal unit cell), the rotation center (120) is shown as being formed at the center of the unit cell ((a) of FIG. 8), at the edge of the unit cell ((b) of FIG. 8), and at the center of the side forming the unit cell.

[0085] Here, when each layer (100) shown in FIG. 8 is laminated, when rotating around the shaft through the above-described rotation mechanism, the number of layers of layers laminated until a grid pattern similar to a specific layer appears based on the stacking direction is different depending on the position and rotation angle of each rotation center (120). At this time, when the rotation center (120) is located at the center of the unit cell, it must rotate up to 60 xn degrees for the same grid pattern to appear, when the rotation center (120) is located at the edge of the unit cell, it must rotate up to 120 xn degrees for the same grid pattern to appear, and when the rotation center (120) is located at the center of the side of the unit cell, it must rotate up to 180 xn degrees. Specifically, the number of layers that can produce the same grid pattern according to the rotation angle of each layer is as follows [Table 2].

[0086] Rotation axis positionRotation angle5˚10˚20˚30˚40˚50˚60˚Center12632361Corner2412643122Center of side3618969183

[0087]

[0088] In summary, Fig. 7 shows the number of layers in which the same grid pattern is formed when the center of rotation is formed at the center of the unit cell but the shape of the unit cell is different, and Fig. 8 shows the number of layers in which the same grid pattern is formed when the position of the center of rotation is different in the unit cell of the same shape.

[0089] Meanwhile, the greater the number of layers required to rotate until a consistent grid pattern is achieved, the more complex the structure appears when viewed from the stacking direction. This more complex shape leads to improved fine dust capture capacity, higher pressure drop, and greater mechanical strength. This will be discussed later.

[0090] FIG. 9 is a drawing showing a rotated state of each layer according to the present invention, and FIG. 10 is a drawing showing a stacked state of each layer illustrated in FIG. 9.

[0091] Hereinafter, with reference to FIGS. 9 and 10, the rotational state of the variable helical laminated structure according to the present invention will be described.

[0092] Meanwhile, FIGS. 9 and 10 illustrate the center position (C) of each layer (100) where the center of rotation (120) can be formed.

[0093] Fig. 9 illustrates a method for rotating each layer (100) according to the present invention. When each layer (100) according to the present invention is connected to a rotation center (120), each layer (100) can rotate around the shaft according to the rotation mechanism described above. However, for convenience of explanation, Fig. 9 illustrates each layer (100) in an individual state rather than a stacked state.

[0094] In (a) of Fig. 9, a first layer (100_1) is illustrated. The first layer (100_1) is not rotated relative to the reference line (L). In (b) of Fig. 9, a second layer (100_2) is illustrated. The second layer (100_2) is rotated in a plane by θ° with respect to the central axis (C) relative to the reference line (L). In (c) of Fig. 9, a third layer (100_3) is illustrated. The third layer (100_3) is rotated in a plane by 2θ° with respect to the central axis (C) relative to the reference line (L). As illustrated in Fig. 9, the difference in rotation angle between neighboring layers (100) in the longitudinal direction of the rotation center (120) is θ°.

[0095] In FIGS. 9 and 10, only three layers are shown rotated, but from the fourth layer onwards, additional layers rotated in a plane that differs by θ° from the previous layer can be formed.

[0096] In summary, in one embodiment of the present invention, the user rotates the first layer by a certain angle (θ°) around the shaft while each layer (100) is connected to the rotation center (120), rotates the second layer by x times the angle by which the first layer is rotated, rotates the third layer by 2x times the angle by which the first layer is rotated, and repeats this process up to the nth layer. At this time, the rotation direction of each layer may be the same. FIG. 10 shows a state in which each layer described with reference to FIG. 9 is stacked.

[0097] Of course, as described above, the user can set various rotation angles or rotation directions for each layer.

[0098] When a laminated structure in which each layer (100) is rotated at a preset angle is viewed from above, various grid patterns are formed. In Fig. 10, three layers are laminated, but as the number of layers (100) increases, the grid patterns appear in various ways. However, when a user rotates each layer (100) at a preset angle and then views the structure from above when reaching a preset number of layers (100), a grid pattern can be formed consistently.

[0099] Figures 11 to 14 are drawings showing a state in which each layer of a variable helical laminated structure according to the present invention is rotated at a certain angle.

[0100] The layers illustrated in FIGS. 11 to 14 use a square mesh structure as the unit cell lattice structure. In FIGS. 11 to 14, (a) is a top view of the structure, and (b) is a perspective view of the structure, in which it can be confirmed that each layer is rotated along the stacking direction (the longitudinal direction of the rotation axis member).

[0101] Figure 11 illustrates a case where the rotation angle of each layer in the variable helical laminate structure according to the present invention is 0° (non-rotated). This is called a monolithic structure. In this structure, the lattice pattern has a constant lattice pattern when viewed from above (or below) the structure.

[0102] FIG. 12 illustrates a state in which each layer is sequentially rotated by 45° in a variable helical laminated structure according to the present invention, FIG. 13 illustrates a state in which each layer is sequentially rotated by 30° in a variable helical laminated structure according to the present invention, and FIG. 14 illustrates a state in which each layer is sequentially rotated by 15° in a variable helical laminated structure according to the present invention.

[0103] Referring to FIGS. 11 to 14 and Tables 1 and 2 above, various grid patterns are formed depending on the rotation angle of each layer (100), and the density of the structure varies depending on the number of layers in which the same grid pattern is formed. Here, the grid pattern may include the size of the grid space. The grid space may mean a space formed by the grid pattern when viewed in the stacking direction of the layer (100).

[0104] Meanwhile, by controlling the rotation angle or number of layers of each layer (100), the density of the structure can be increased, and a complex grid pattern can be formed, thereby improving the performance of capturing substances (e.g., fine dust), pressure drop, and mechanical strength. This will be described later.

[0105] Meanwhile, a layer having a unit cell lattice structure according to one embodiment of the present invention can be manufactured with a 3D printer using 3D printing software. Among 3D printing methods, photocuring methods that use light energy to harden a polymer include PuSL (projection micro-stereolithography), DLP (digital light processing), SLA (Stereo Lithography Apparatus), SLS (Selective laser sintering), SPPW (Self-propagating photopolymer waveguide), etc., and methods for outputting materials include FDM (Fused deposition modeling, or FFF, Fused filament fabrication), Binder jetting, etc. Depending on the manufacturing method, the size of the unit cell and the thickness of the lattice member can be adjusted to various sizes.

[0106] FIG. 15 is a drawing showing a state in which a rotation center (120) is formed at a position spaced a certain distance apart from the center (C) of a layer (100) in a variable helical stacked structure according to the present invention.

[0107] As described above, the rotation center (120) can be formed at various locations on each layer (100). FIG. 15 illustrates a state in which the rotation center (120) is formed near one edge of each layer (100) (a location spaced a certain distance apart from the center position (C) of the layer), and the layers (100) in this state are stacked around the rotation center (120). FIG. 15 (a) and (b) are views of the structure according to the present invention viewed from above. When each layer (100) is not rotated to have a monolithic structure as in FIG. 15 (a), and each layer (100) is rotated at a certain angle around the rotation center (120) along the stacking direction as in FIG. 15 (b), various lattice patterns are formed when the structure is viewed from above due to interference between the layers (100).

[0108] Meanwhile, the variable helical laminated structure in which each layer (100) is rotated around the center of rotation (120) according to the above-described method can have its overall shape processed to suit the intended use.

[0109] Fig. 16 is a graph showing the compressive strength of a helical laminated structure having a lattice structure according to one embodiment of the present invention.

[0110] Referring to FIG. 16, the compressive strength among the mechanical properties of a helical laminated structure having a lattice structure according to one embodiment of the present invention will be examined.

[0111] Figure 16 shows a graph comparing the compressive strength of a monolithic structure and a helical laminated structure. As shown in Figure 12, when examining the magnitude of the axial load that the structure can withstand based on the same strain, it can be seen that the helical laminated structure is superior to the monolithic structure.

[0112] In addition to the above compressive strength, the helical laminated structure according to the present invention can have a low density by reducing the number of layers (100), has a high specific strength, and can flexibly absorb external impacts, so that it can be utilized in various industrial fields.

[0113] Meanwhile, as described above, the helical laminate structure according to the present invention can also be used as a filter for capturing fine dust. In this case, the surface on which the grid pattern is formed is arranged in the direction of fluid flow. Then, fine dust contained in the fluid passes through the helical laminate structure and adheres to the grid members constituting the grid pattern. The helical laminate structure according to the present invention can selectively capture only fine particles below a certain size among fine particles.

[0114] When fine particles collide with the helical laminate structure of the present invention, they adhere to the grid member due to static electricity generated by charging. The magnitude of the adhesive force varies depending on the size and speed of the fine particles. That is, the faster the speed and the larger the particle, the less likely it is to adhere to the grid member and the more likely it is to bounce off. Theoretically, the energy required for a particle to bounce off the grid member can be calculated using the mathematical formula below. However, in an actual experimental environment, it was confirmed that fine particles with a size of 2 to 15 μm adhere simply by colliding with the grid member.

[0115]

[0116] < Mathematical formula >

[0117]

[0118] Here, KEb is a string representing the kinetic energy required for the bounce to occur when a fine particle bounces off, dp is the particle diameter, x is the separation distance, A is the Hamaker constant, and e is the coefficient of restitution.

[0119] In one embodiment of the present invention, fine particles having a size smaller than or equal to a preset first particle size among fine particles are adhered when colliding with a grid member. In one embodiment of the present invention, the first particle size is 10 μm. On the other hand, particles having a size larger than the first particle size and smaller than the preset second particle size are not adhered when colliding with the grid member and can pass through the grid space. In one embodiment of the present invention, the second particle size may be set to 500 μm. However, the first particle size and the second particle size may be set in various ways according to the intention of the capture filter designer.

[0120] Meanwhile, pressure drop is generally considered as one of the performances of a filter. Pressure drop refers to the pressure difference before and after the filter, and the smaller the pressure drop, the better the filter performance. When a fluid passes through a helical laminate structure in the direction of the lamination, if the space between the lattice members is large, the fluid moves easily, resulting in a small pressure drop. Since the space through which the fluid passes in a conventional filter is smaller than that in a helical laminate structure, the helical laminate structure according to the present invention has superior performance than a conventional filter in terms of pressure drop.

[0121] Meanwhile, when the variable helical laminated structure according to the present invention is used as a filter, fine particles adhered to the collection filter can be washed away by a washing liquid such as water, so it is possible to reuse the collection filter.

[0122] The variable helical laminated structure according to the present invention can be used for various purposes considering the performance, mechanical strength, etc. of the filter. In addition, even when a conventional 3D three-dimensional structure is being used for a specific purpose (e.g., a filter, etc.), there was a problem that it had to be manufactured anew when the usage environment changed, but according to the present invention, even when the variable helical laminated structure is being used for a specific purpose, when the usage environment changes, it is possible to flexibly respond to changes in the usage environment by changing the rotation angle of at least one layer among each layer, or replacing and mounting a layer having a different unit cell lattice structure or a layer having a different position of a connection part.

[0123] A variable helical laminated structure according to one embodiment of the present invention can be used in blades for wind turbines, smoke reduction devices, soot reduction devices, fine particle collection devices, etc.

[0124] While the present invention has been described with reference to the embodiments illustrated in the accompanying drawings, these are merely exemplary, and those skilled in the art will appreciate that various modifications and equivalent embodiments are possible. Accordingly, the true scope of protection of the present invention should be determined solely by the appended claims.

Claims

1. Center of rotation; and It has a unit cell lattice structure, and includes a plurality of layers that are laminated in the length direction of the rotation center and are coupled to the rotation center; A variable helical laminate structure, wherein each of the above layers can be rotated at a preset angle around the rotation center.

2. In paragraph 1, The above rotation center is, A first gear part having a ring shape, the outer surface of which is connected to the unit cell and the inner surface of which has a first gear tooth; A second gear part arranged at the center of the first gear part and having a second gear tooth on the outer surface; and A variable helical laminated structure characterized by including a third gear portion that is gear-engaged with the first gear portion and the second gear portion.

3. In paragraph 2, A variable helical laminated structure characterized in that a shaft is formed at the center of the second gear portion so as to penetrate each layer and is fixed to the second gear portion.

4. In paragraph 2, A variable helical laminated structure, characterized in that the number of gear teeth of the first gear section, the number of gear teeth of the second gear section, or the number of gear teeth of the third gear section in each rotation center of adjacent layers among the above layers are set differently.

5. In paragraph 1, A variable helical laminated structure characterized in that the rotation center is formed in the internal space of the unit cell, and the rotation center and the unit cell are connected to each other by an auxiliary member.

6. In paragraph 1, The above rotation center is, A ring portion connected to the above unit cell and having a first magnetic body fixedly arranged on the inner surface; and A shaft is located on the inner side of the above ring portion, and has a first magnetic body and a second magnetic body that can exert a magnetic force on the outer surface thereof fixedly arranged; A variable helical laminated structure characterized in that the first and second magnetic bodies are electromagnets.

7. In paragraph 6, A variable helical laminated structure characterized in that the first and second magnetic bodies are each composed of a plurality of pieces and arranged in a circumferential direction based on the center of the ring portion.

8. In paragraph 6, A variable helical laminated structure characterized in that the first and second magnetic bodies are arranged in a position facing each other but are capable of contacting each other.

9. In paragraph 8, A variable helical laminated structure characterized in that the facing surfaces of the first magnetic body and the second magnetic body are formed with the same curvature.

10. In paragraph 8, A variable helical laminated structure characterized in that a magnetic force acting between the first magnetic body and the second magnetic body is greater than a frictional force acting between the first magnetic body and the second magnetic body.

11. In paragraph 6, A deformable helical laminated structure characterized in that when electricity is applied to the first and second magnetic bodies, the ring portion rotates until the first and second magnetic bodies to which electricity is applied are arranged on the same radial line with respect to the center of the ring portion.

12. In paragraph 1, A variable helical laminated structure characterized in that the center of rotation is formed at the center of the internal space of the unit cell, at a corner of the unit cell, or at the center of a side forming the unit cell.

13. In paragraph 1, A variable helical laminated structure characterized in that when the above layers are rotated and laminated at a certain angle, a complex lattice pattern appears when viewed from the stacking direction as the number of layers until layers having the same lattice pattern are laminated increases.

14. In paragraph 1, A variable helical laminated structure characterized in that the center of rotation is formed at the center of each layer.

15. In paragraph 1, A variable helical laminated structure, characterized in that the rotation center is formed at a position spaced a certain distance from the center of each layer.

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