Fluid transfer device and power generation device that also serves as a fluid transfer device.

Abstract

To provide a fluid transfer device which gives propulsive force in a flow direction to fluid flowing inside a fluid transfer pipe comprising a cylindrical body.SOLUTION: A fluid transfer device is provided with a magnet body forming a cross-sectionally annular field, and a cylindrical coil extending in the flow direction in the cross-sectionally annular field by the magnet body. The field is formed between a cylindrical stator part and a cylindrical rotor part extending in the flow direction while sandwiching the cylindrical coil therebetween in a radial direction. The magnet body comprises a plurality of magnets arranged in the peripheral wall surface of the rotor part facing the stator part by sandwiching the cylindrical coil in between. The plurality of magnets are constituted due to that a plurality of magnet rows extending in parallel to the flow direction at a prescribed interval therebetween in the circumferential direction of a rotor are arranged on the peripheral wall surface in a direction oblique to the flow direction. An angle θ made between line segments extending obliquely intersecting in the flow direction between the magnet rows adjacent in the circumferential direction, and the flow direction is 5 degrees to 85 degrees. The plurality of magnets constituting the magnet body are rotated in the circumferential direction by electrifying the cylindrical coil so as to apply propulsive force.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a fluid transfer device that applies a propulsive force flowing in the flow direction to a fluid such as liquid or gas flowing inside a fluid transfer pipe. The present invention also relates to a power generation device that also serves as the aforementioned fluid transfer device. [Background Art]

[0002] An axial flow pump is known as one type of fluid transfer device that applies a propulsive force flowing in the flow direction to a fluid such as liquid flowing inside a fluid transfer pipe. Axial flow pumps deliver fluid in the direction in which their central rotation axis extends, and for example, those used for circulating cooling water in automobile engines are known (Patent Document 1).

[0003] The axial flow pump of Patent Document 1 is configured of an electric motor that drives a rotating shaft disposed inside a cylindrical case. The electric motor includes a cylindrical stator disposed outside the cylindrical case, and a cylindrical rotor rotatably disposed inside the case. Moving blades, which are disposed between the rotating shaft and the rotor and connect the rotating shaft and the rotor, rotate along with the rotation of the rotor, and this configuration is such that a propulsive force in the flow direction is applied to the fluid inside the cylindrical case. [Prior Art Documents] [Patent Documents]

[0004] [Patent Document 1] Japanese Unexamined Patent Publication No. Hei 9-228977 [Summary of the Invention] [Problems to be Solved by the Invention]

[0005] The objective of this invention is to provide a fluid transfer device that provides a propulsive force to a fluid, such as a liquid or gas, flowing inside a fluid transfer pipe, in the direction of flow. Furthermore, the objective is to propose a power generation device that also functions as a fluid transfer device, such as the fluid transfer device described above. [Means for solving the problem]

[0006] The fluid transfer device of the present invention is used by being installed in the middle of a fluid transfer pipe through which a fluid such as a liquid or gas is transferred.

[0007] The fluid transfer device comprises a cylindrical body through which the fluid is transferred, a magnetic body that forms an annular cross-section magnetic field, and a cylindrical coil that extends in the direction in which the cylindrical body extends within the annular cross-section magnetic field formed by the magnetic body.

[0008] The magnetic body that forms the annular cross-section magnetic field is made up of a plurality of magnets arranged at predetermined intervals from each other in the circumferential direction of a central axis extending from the center of the cylindrical body.

[0009] By energizing the cylindrical coil, the multiple magnets constituting the magnetic body rotate in the circumferential direction according to the principle of a motor, thereby imparting a propulsive force to the fluid that flows in the direction of flow.

[0010] Multiple magnets rotating in the circumferential direction of the central axis of the cylindrical body through which the fluid is transported act as blades or propellers, providing a thrusting force that moves in the direction of fluid flow relative to the fluid.

[0011] The fluid transfer apparatus of the present invention is represented by the following embodiments. [1] A fluid transfer device that provides a propulsive force in the direction of flow to a fluid flowing inside a fluid transfer tube consisting of a cylindrical body, The device comprises a magnetic body that forms a magnetic field with an annular cross-section, and a cylindrical coil that extends in the flow direction within the annular magnetic field formed by the magnetic body. The annular cross-section magnetic field is formed between a cylindrical stator section and a cylindrical rotor section that extend in the flow direction, with the cylindrical coil sandwiched between them radially. The aforementioned magnet body consists of a plurality of magnets arranged on the peripheral wall surface of the rotor portion facing the stator portion, with the cylindrical coil sandwiched in between. Multiple rows of magnets extending parallel to the flow direction with a predetermined distance between them in the circumferential direction of the rotor are arranged on the circumferential wall surface in a direction oblique to the flow direction, thereby forming a plurality of magnets. Between adjacent magnet rows in the circumferential direction, the angle θ formed between a line segment extending obliquely in the flow direction and the flow direction is in the range of 5 to 85 degrees. By energizing the cylindrical coil, the multiple magnets constituting the magnet body rotate in the circumferential direction, thereby imparting the propulsive force. Fluid transfer device.

[0012] [2] A fluid transfer device [1] in which each of the magnet arrays is the same shape and size as the others.

[0013] [3] Each of the aforementioned magnet rows is formed by arranging multiple magnets at predetermined intervals between adjacent magnets in the flow direction [2].

[0014] [4] Among the multiple magnets arranged on the circumferential wall surface of the rotor at a predetermined distance from each other in the circumferential direction and in a direction oblique to the flow direction, no grooves are formed between adjacent magnets in the circumferential direction. The fluid transfer device [3], wherein grooves formed between adjacent magnets in the flow direction remain in place among a plurality of magnets arranged at predetermined intervals between adjacent magnets in the flow direction, thereby forming grooves extending obliquely to the flow direction on the peripheral wall surface of the rotor.

[0015] [5] The fluid transfer device according to [3] or [4], wherein a support member that raises a position of the magnet in a radial direction is interposed between the rotor half portion and the magnet.

[0016] [6] The fluid transfer device according to any one of [1] to [5], wherein a coil winding constituting the cylindrical coil is wound obliquely to the flow direction of the fluid in the same inclination direction as the direction in which the magnet rows are inclined with respect to the flow direction.

[0017] [7] The fluid transfer device according to [2], wherein each of the plurality of magnet rows is screwed to a peripheral wall surface of the rotor portion.

[0018] [8] A fluid transfer device that applies a propulsive force in a flow direction to a fluid flowing inside a fluid transfer pipe formed of a cylindrical body, comprising: a magnet body that forms an annular magnetic field in cross section; and a cylindrical coil that extends in the flow direction within the annular magnetic field in cross section formed by the magnet body, the annular magnetic field in cross section is formed between a cylindrical outer yoke and a cylindrical inner yoke that extend in the flow direction with the cylindrical coil interposed therebetween in a radial direction, the magnet body includes a plurality of magnets disposed on an inner circumferential wall surface of the outer yoke, an outer circumferential wall surface of the inner yoke, or both the inner circumferential wall surface of the outer yoke and the outer circumferential wall surface of the inner yoke that face each other with the cylindrical coil interposed therebetween, on the inner circumferential wall surface of the outer yoke, a plurality of magnet rows extending parallel to the flow direction at predetermined intervals from each other in a circumferential direction of the outer yoke are disposed on the inner circumferential wall surface of the outer yoke in a direction obliquely intersecting the flow direction to constitute the plurality of magnets, or on the outer circumferential wall surface of the inner yoke, a plurality of magnet rows extending parallel to the flow direction at predetermined intervals from each other in a circumferential direction of the inner yoke are disposed on the outer circumferential wall surface of the inner yoke in a direction obliquely intersecting the flow direction to constitute the plurality of magnets, or A plurality of magnet rows extending parallel to the flow direction at predetermined intervals from each other in the circumferential direction of the outer yoke are disposed on the inner peripheral wall surface of the outer yoke in a direction obliquely intersecting the flow direction, and a plurality of magnet rows extending parallel to the flow direction at predetermined intervals from each other in the circumferential direction of the inner yoke are disposed on the outer peripheral wall surface of the inner yoke in a direction obliquely intersecting the flow direction, thereby constituting the plurality of magnets, an angle θ formed between a line segment extending obliquely to the flow direction between adjacent magnet rows in the circumferential direction and the flow direction is in a range of 5 degrees to 85 degrees, when the cylindrical coil is energized, the plurality of magnets constituting the magnet body rotate in the circumferential direction, whereby the propulsive force is applied A fluid transfer device.

[0019] [9] The fluid transfer device according to [8], wherein each of the magnet rows has the same shape and the same size as each other.

[0020]

[10] The fluid transfer device according to [9], wherein each of the magnet rows is formed by disposing a plurality of magnets at predetermined intervals from adjacent magnets in the flow direction.

[0021]

[11] No groove is formed between circumferentially adjacent magnets among the plurality of magnets disposed on the peripheral wall surface in a direction obliquely intersecting the flow direction at predetermined intervals from each other in the circumferential direction of the rotor, grooves formed between flow-directionally adjacent magnets among the plurality of magnets disposed at predetermined intervals between flow-directionally adjacent magnets remain, whereby grooves extending in a direction obliquely intersecting the flow direction are formed on the peripheral wall surface of the rotor. The fluid transfer device according to

[10] .[

[0022]

[12] A fluid transfer device

[10] or

[11] wherein a support material is interposed between the rotor portion and the magnet to raise the radial position of the magnet.

[0023]

[13] The coil windings constituting the cylindrical coil are wound obliquely to the fluid flow direction in the same inclination direction as the magnet row is inclined with respect to the flow direction, in any of the fluid transfer devices [7] to

[10] .

[0024]

[14] Each of the aforementioned arrays of magnets is, The outer yoke is screwed to, or The inner yoke is screwed in, or It is screwed to the outer yoke and also screwed to the inner yoke. A fluid transfer device of any of the following types: [7] to

[10] .

[0025]

[15] A generator that also serves as a fluid transfer device, having the structure of [1] or [8]. [Effects of the Invention]

[0026] According to this invention, it is possible to provide a fluid transfer device that provides a propulsive force to a fluid, such as a liquid or gas, flowing inside a fluid transfer pipe, in the direction of flow. Furthermore, according to this invention, it is possible to provide a power generation device that is also a fluid transfer device and can be used as a power generation device. [Brief explanation of the drawing]

[0027] [Figure 1] A partially omitted cross-sectional view of a fluid transfer device according to one embodiment of this invention. [Figure 2] This diagram shows the internal structure of the fluid transfer device shown in Figure 1, with some parts omitted, as viewed from left to right in Figure 1 (indicated by arrow 41 in Figure 1). [Figure 3] A partially omitted perspective view showing the internal structure of the fluid transfer device illustrated in Figure 1. [Figure 4] Another perspective view, with some parts omitted, showing the internal structure of the fluid transfer device illustrated in Figure 1. [Figure 5] A cross-sectional view showing a fluid transfer device according to another embodiment of this invention, with some parts omitted. [Figure 6] A perspective view showing the internal structure of the fluid transfer device illustrated in Figure 5, with some parts omitted. [Figure 7] A partially omitted perspective view illustrating the schematic structure of one embodiment of a hollow cylindrical coil used in a fluid transfer device according to one embodiment of this invention. [Figure 8] Figure 7 shows an example of the cross-sectional structure of the wire material forming each individual coil in a plurality of individual coils that make up the cylindrical coil shown in the figure. [Figure 9] Figure 7 illustrates one embodiment of each individual coil in the cylindrical coil shown, viewed from a side direction perpendicular to the axial direction of the cylindrical coil (direction from the radial outside to the inside). [Figure 10] (a) is a partially omitted diagram illustrating that the coil shown in Figure 9 is formed by winding a wire spirally multiple times around a winding axis, and (b) is a partially omitted diagram illustrating that a coil of a different embodiment from Figure 10(a) is formed by winding a wire spirally multiple times around a winding axis. [Figure 11] This diagram illustrates an example of a structure in which a cylindrical coil is formed from multiple individual coils, and each individual coil is electrically connected to the next in-phase individual coil in the circumferential direction. [Figure 12] This figure shows an example of an embodiment in which multiple magnets, each consisting of multiple rows of magnets arranged obliquely to the fluid flow direction and with a predetermined distance between them in the circumferential direction of the peripheral wall, rotate in the circumferential direction to provide a propulsive force to the fluid that flows in the direction of the fluid flow, thereby acting as blades or propellers, with (a) being a perspective view and (b) being a side view. [Figure 13]This figure shows another example of an embodiment in which a plurality of magnets, each arranged in a direction oblique to the fluid flow direction and with a predetermined distance between them in the circumferential direction of the peripheral wall, rotate in the circumferential direction to provide a propulsive force to the fluid that flows in the direction of the fluid flow, thereby acting as a blade or propeller, with (a) being a perspective view and (b) being a side view. [Figure 14] This figure shows another example of an embodiment in which a plurality of magnets, each arranged in a direction oblique to the flow direction, rotate in the circumferential direction to provide a propulsive force to the fluid that flows in the flow direction, acting as blades or propellers, wherein (a) is a perspective view, (b) is a side view, and (c) is a view from the flow direction. [Figure 15] This figure shows another example of an embodiment in which a plurality of magnets, each arranged in a direction oblique to the flow direction, rotate in the circumferential direction to provide a propulsive force to the fluid that flows in the flow direction, acting as blades or propellers, wherein (a) is a perspective view, (b) is a side view, and (c) is a view from the flow direction. [Figure 16] This figure shows another example of an embodiment in which a plurality of magnets, each arranged in a direction oblique to the flow direction, rotate in the circumferential direction to provide a propulsive force to the fluid that flows in the flow direction, acting as blades or propellers, wherein (a) is a perspective view, (b) is a side view, and (c) is a view from the flow direction. [Figure 17](a) A conceptual diagram, partially omitted, illustrating a structure in which, in a fluid transfer device according to one embodiment of the present invention, a plurality of magnets forming an annular cross-section magnetic field are arranged extending obliquely to the direction of fluid flow, and the coil windings constituting the cylindrical coil are wound not obliquely to the direction of fluid flow. (b) A conceptual diagram, partially omitted, illustrating a structure in which, in a fluid transfer device according to one embodiment of the present invention, a plurality of magnets forming an annular cross-section magnetic field are arranged extending obliquely to the direction of fluid flow, and the coil windings constituting the cylindrical coil are also wound obliquely to the direction of fluid flow. [Figure 18] The following are conceptual diagrams illustrating the relationship between the direction in which the first axial winding portion and the second axial winding portion, which constitute the portion of the cylindrical coil shown in Figure 7 that extends in the direction in which the axis of the cylindrical coil extends, and the direction in which the magnet is arranged: (a) is an arrangement in which both the magnet and the first axial winding portion and the second axial winding portion extend in the direction in which the axis extends; (b) is an arrangement in which only the magnet is positioned at an angle to the direction in which the axis extends, compared to the arrangement in Figure 18(a); and (c) is a conceptual diagram illustrating an arrangement in which both the magnet and the first axial winding portion and the second axial winding portion extend at an angle to the direction in which the axis extends, compared to the arrangement in Figure 18(a). [Figure 19] A perspective view illustrating another embodiment of the structure of the rotor section in a fluid transfer device according to one embodiment of the present invention. [Figure 20] A perspective view illustrating yet another embodiment of the structure of the rotor section in a fluid transfer device according to one embodiment of the present invention. [Figure 21] A conceptual diagram illustrating the angle θ formed between a line segment extending obliquely in the flow direction and the flow direction, in a fluid transfer device according to one embodiment of this invention. [Figure 22] This figure illustrates another embodiment of a fluid transfer device according to one embodiment of the present invention, where (a) is a perspective view showing a part in cross-section, and (b) is a perspective view showing a part omitted to illustrate the structure of the rotor section. [Figure 23]This figure illustrates yet another embodiment of a fluid transfer device according to one embodiment of the present invention, where (a) is a perspective view showing a part in cross-section, (b) is a perspective view showing a part omitted to illustrate the structure of the rotor section, and (c) is a perspective view showing a part omitted to illustrate the rotor section viewed from a different direction than in Figure 23(b). [Figure 24] A conceptual diagram illustrating an example in which a generator that also serves as a fluid transfer device, according to one embodiment of this invention, is used. [Modes for carrying out the invention]

[0028] (First embodiment) An embodiment of the fluid transfer device of the present invention will be described with reference to Figures 1 to 4.

[0029] The fluid transfer device 1 shown in Figure 1 provides a thrusting force in the direction of flow to the fluid flowing inside a fluid transfer pipe made of a cylindrical body. Although not shown in the illustration, in Figure 1, fluid transfer pipes made of cylindrical bodies (not shown) are continuous to the left of cylindrical part 2a and to the right of cylindrical part 2b.

[0030] The fluid transfer device of this embodiment includes a magnetic body that forms a magnetic field with an annular cross-section, and a cylindrical coil that extends in the direction in which the cylindrical body extends, i.e., in the direction of fluid flow, within the annular magnetic field formed by the magnetic body.

[0031] In the illustrated embodiment, the cylindrical portion sandwiched between the cylindrical portion 2a and the cylindrical portion 2b forms the stator portion 3, and a cylindrical rotor portion 5 is arranged coaxially inside the stator portion 3.

[0032] A magnetic field with an annular cross-section is formed between the stator section 3 and the rotor section 5. As shown in Figure 1, the cylindrical coil 4 extends within this annular magnetic field in the direction in which the cylindrical body constituting the fluid transfer pipe extends, i.e., in the direction of fluid flow. The stator section 3 can be made of a material that does not lose its magnetic field, such as stainless steel. A magnetic material can be used for the rotor section 5.

[0033] In the illustrated embodiment, a magnet is arranged on the outer circumferential wall surface of the rotor 5, which faces the inner circumferential wall surface of the stator 3. As a result, an annular magnetic field is formed between the stator 3 and the rotor 5 by the magnet.

[0034] Although not shown in the diagram, the cylindrical parts 2a and 2b in Figure 1 can be connected to form a fluid transfer pipe consisting of a cylindrical body, and the cylindrical stator part 3 constituting the fluid transfer device 1 can be supported by a support bowl extending radially inward from the inner circumferential wall of the fluid transfer pipe and positioned inside the fluid transfer pipe.

[0035] The rotor section 5, which is arranged radially inward of the stator section 3 and coaxially with the stator section 3, is arranged to be rotatable in the circumferential direction relative to the stator section 3.

[0036] In the illustrated embodiment, the center of the stator portion 3 is supported by support arms 8a, 8b, ... extending radially inward from the inner circumferential wall surface of the cylindrical portion 2b, thereby supporting a rotating support shaft 9 that extends in the direction of fluid flow. In this specification and drawings, the support arms 8a, 8b, ... may be collectively referred to as support arm 8.

[0037] The rotor support shaft 11 is rotatably supported on the tip side of the rotation support shaft 9. The rotor section 5 is supported by the radially outer portion 11d of the rotor support arms 11a, 11b, and 11c, whose radially inner portions are supported by the rotor support shaft 11, thereby allowing it to rotate circumferentially around the rotation support shaft 9 and rotor support shaft 11, as shown by the arrow 40 in Figure 2.

[0038] The magnetic body that is arranged on the outer circumferential wall surface of the rotor section 5 and forms the annular cross-sectional magnetic field described above is composed of a plurality of magnets 6a, 6b, 6c, 6d, 6e, 6f, 6g, 6h arranged at predetermined intervals from each other in the circumferential direction in the illustrated embodiment (Figures 2 and 3). A plurality of magnet rows extending parallel to the flow direction at predetermined intervals from each other in the circumferential direction of the rotor section 5 are arranged on the outer circumferential wall surface of the rotor section 5 in a direction oblique to the flow direction, thereby forming a plurality of magnets 6a to 6h (Figure 3). Each magnet row constituting the plurality of magnets 6a to 6h is configured such that south pole magnets and north pole magnets are alternately arranged at predetermined intervals from each other in the circumferential direction of the rotor section 5. Grooves 36a, 36b, 37c, ... are formed between each magnet row as shown in Figure 3. As described above, since the magnets 6a to 6h are arranged on the outer circumferential wall surface of the rotor section 5 in a direction oblique to the flow direction, the grooves 36a, 36b, 37c, ... formed between each row of magnets are also formed on the outer circumferential wall surface of the rotor section 5 in a direction oblique to the flow direction, as shown in Figure 3.

[0039] Each of the magnet arrays constituting the multiple magnets 6a to 6h can be made to have the same shape and size as shown in Figures 3, 12 to 14.

[0040] Furthermore, as shown in Figures 15 and 16, each of the magnet rows constituting the multiple magnets 6a to 6h can be formed by arranging multiple magnets at predetermined intervals between adjacent magnets in the direction of fluid flow.

[0041] Hereafter, in this specification and in the drawings, the magnets 6a to 6h that constitute each magnet row may be collectively referred to simply as magnet 6.

[0042] Furthermore, the grooves 36a, 36b, 36c, ... formed between each magnet row are collectively referred to as grooves 36, or as skew grooves 36 because they are formed on the outer circumferential wall surface of the rotor section 5 in a direction oblique to the flow direction and are thus formed at an angle.

[0043] The cylindrical coil 4, which extends in the direction in which the cylindrical body constituting the fluid transfer tube extends within the annular cross-sectional magnetic field formed between the stator section 3 and the rotor section 5, is arranged coaxially with respect to the stator section 3 and the rotor section 5, as shown in Figure 1. The coil support sections 7a, 7b, and 7c, which extend radially inward from the inner circumferential wall surface of the cylindrical section 2a, enable the cylindrical coil 4 to be arranged coaxially with respect to the stator section 3 and the rotor section 5. In this specification and drawings, the coil support sections 7a, 7b, and 7c may be collectively referred to as the coil support section 7.

[0044] An example of a cylindrical coil 4 will be explained using Figures 7 to 11. The cylindrical coil 4 is hollow and can be formed from multiple individual coils 50 (Figure 7). In this case, the peripheral wall 4a of the cylindrical coil 4 is formed by continuously arranging the multiple individual coils 50 in the circumferential direction of the cylindrical coil 4.

[0045] As the cylindrical coil 4, a hollow cylindrical coil used in motors, generators, and the like can be used.

[0046] One example of a hollow cylindrical coil used in motors and generators is proposed in Japanese Patent Publication No. 3704044. This hollow cylindrical coil is formed by etching conductive plate-like materials (e.g., copper plates) to create conductive strips, then forming two thin metal plates into cylinders, and concentrically stacking these two cylinders as an inner and outer cylinder.

[0047] Furthermore, Japanese Patent Publication No. 2017-70140 proposes a hollow, cylindrical coil body formed by folding a conductive sheet having multiple conductive strips and shaping the folded conductive sheet into a cylindrical form.

[0048] In Japanese Patent Publication No. 6948748 and Japanese Patent Publication No. 6989204, the applicant proposes a hollow, cylindrical coil made by winding wire, which is arranged concentrically with respect to the rotation axis of a rotating electric machine. This coil is constructed by winding a wire spirally multiple times around a winding axis extending radially perpendicular to the rotation axis, and multiple flat coil bodies are arranged continuously in the circumferential direction of a cylindrical coil body to surround the rotation axis of the rotating electric machine. The wire is, for example, made by bundling multiple conductive wires, each with an enamel layer on its outer circumference, and then covering them with a fibrous material such as glass fiber.

[0049] Here, we will describe an embodiment in which a hollow, cylindrical coil made by winding wire is used as the cylindrical coil 4, arranged concentrically with respect to the rotation axis of the rotating electric machine.

[0050] The cylindrical coil 4 is hollow and can be formed from multiple individual coils 50 (Figure 7). In this case, the multiple individual coils 50 are arranged continuously in the circumferential direction of the cylindrical coil 4 to form the peripheral wall 4a of the cylindrical coil 4.

[0051] A coil unit 50 is, for example, composed of a conductive wire 51 whose periphery is insulated (Figure 8). The wire 51 shown in Figure 8 consists of multiple copper wires 53, each covered with an enamel layer 52 on its outer circumference, bundled together and then covered with a fibrous material 54 such as glass fiber.

[0052] Before multiple individual coils 50 are continuously arranged in the circumferential direction of the cylindrical coil 4 to form the peripheral wall 4a of the hollow cylindrical coil 4, the individual coils 50 are flat coil bodies, as illustrated in Figure 9.

[0053] A flat coil unit 50 is formed by winding a wire 51 multiple times in a spiral shape around a winding shaft 61 (Figures 9 and 10) that is perpendicular to the direction in which the axis 60 (Figure 7) of the cylindrical coil 4 extends, leaving a hollow portion 59 on the winding shaft 61 side.

[0054] Figures 9 and 10 illustrate and explain a flat coil unit 50 having a configuration comprising a first axial winding portion 55, a second axial winding portion 56, a first circumferential winding portion 57, and a second circumferential winding portion 58.

[0055] The first axial winding portion 55 and the second axial winding portion 56 form the portion of the cylindrical coil 4 in the direction in which the shaft 60 extends. The first circumferential winding portion 57 is formed between one side of the first axial winding portion 55 in the direction in which the shaft 60 extends (upper side in Figure 9) and the same one side of the second axial winding portion 56. The second circumferential winding portion 58 is formed between the other side of the first axial winding portion 55 in the direction in which the shaft 60 extends (lower side in Figure 9) and the other side of the second axial winding portion 56.

[0056] In the embodiments shown in Figures 9 and 10, the first axial winding portion 55 and the second axial winding portion 56 extend linearly in the direction in which the shaft 60 (Figure 7) of the cylindrical coil 4 extends. However, the structure is not limited to this form, and structures and forms in which the shaft 60 (Figure 7) extends in the direction in which it extends, curvilinearly in the left-right direction as shown in Figures 9 and 10, can also be adopted. In this case, the shape will be an ellipse or oblong shape in Figures 9 and 10, with a major axis consisting of the axial winding portion in the vertical direction and a minor axis consisting of the circumferential winding portion in the left-right direction.

[0057] If the fluid transfer device 1 is composed of, for example, a three-phase motor, then the individual coils 50 arranged in the circumferential direction of the cylindrical coil 4 will each constitute one of the U-phase, V-phase, or W-phase coils.

[0058] In this case, as shown in Figure 11, the multiple coil units 50 that are continuously arranged in the circumferential direction of the cylindrical coil 4 and form the peripheral wall 4a of the cylindrical coil 4 are electrically connected to the next in-phase coil unit 50 in the circumferential direction.

[0059] Figure 11 illustrates an example of this electrical connection configuration. In the figure, the components indicated by reference numerals 50a to 50d each consist of individual coils 50, which form, for example, a U-phase in the cylindrical coil 4. As shown in the figure, the individual coil 50a forming the U-phase is located next in the circumferential direction via the wire 51a that constitutes the individual coil 50a, and is electrically connected to the individual coil 50b that also forms the U-phase. The individual coil 50b is located next in the circumferential direction via the wire 51b that constitutes it, and is electrically connected to the individual coil 50c that also forms the U-phase. The V-phase and W-phase have a similar structure.

[0060] The cylindrical portion 2a has an intake section 12 for receiving control and drive wires (Figure 1), through which control signal cables and power cables (not shown) are connected. Note that the control and drive wires are not shown in each drawing.

[0061] As described above, under conditions where an annular magnetic field is formed between the stator section 3 and the rotor section 5, which sandwich the cylindrical coil 4 radially between them, the rotor section 5 rotates circumferentially around the rotation support shaft 9 in the direction indicated by arrow 40 in Figure 2, according to the principle of a motor, when current is passed through the cylindrical coil 4.

[0062] As a result, multiple magnets 6a to 6h also rotate circumferentially around the rotation support shaft 9, thereby imparting a thrusting force to the fluid, such as liquid or gas, flowing inside the fluid transfer pipe in the direction of flow indicated by arrow 42 in Figure 3. In Figure 1, the thrusting force is applied in the direction of flow from left to right in the diagram.

[0063] Multiple magnets 6a to 6h, which rotate in the circumferential direction of the rotor 5 along with the rotation of the rotor 5, act as blades or propellers that provide thrust to the fluid in the direction of flow.

[0064] If the fluid, such as liquid or gas, flowing inside the fluid transfer pipe is flowing in the opposite direction to the direction indicated by arrow 42 in Figure 3, the drive current to the cylindrical coil 4 can be controlled to rotate the rotor 5 in the circumferential direction opposite to arrow 40, thereby similarly imparting a thrust force in the direction of flow to the fluid, such as liquid or gas, flowing inside the fluid transfer pipe.

[0065] As described above, the magnets 6a to 6h, which are arranged in multiple quantities around the circumference of the cylindrical rotor section 5 at predetermined intervals from each other, act as blades or propellers that provide a thrusting force in the direction of flow to the fluid flowing inside the fluid transfer pipe.

[0066] Therefore, the magnet 6 can be configured such that multiple rows of magnets are arranged on the outer circumferential wall surface of the rotor 5, with predetermined spacings between them in the circumferential direction, and parallel to the direction of fluid flow, and are arranged obliquely to the direction of fluid flow. Figures 3 and 12 to 16 illustrate an example of such an arrangement of magnets 6. Magnets 6a to 6h are arranged on the outer circumferential wall surface of the rotor 5, extending obliquely to the direction of fluid flow (from right to left in Figure 3), as shown in Figure 3.

[0067] Figures 12 to 16 show various modifications of an embodiment in which multiple magnets 6a to 6h, which are arranged on the peripheral wall surface of the rotor 5 and extend obliquely to the direction of fluid flow, act as blades or propellers that provide thrust in the direction of fluid flow as the rotor 5 rotates.

[0068] As the rotor 5 rotates in the direction of arrow 44 relative to its rotational axis 43, a fluid propulsion force is imparted to the fluid in the direction indicated by arrow 45.

[0069] In the embodiment described above, since the rotor section 5 is tubular, as described above, when a fluid propulsion force is applied to the fluid and it flows, fluid flow occurs within the rotor section 5 in the same direction of flow.

[0070] Figure 19 shows an example in which, instead of a tubular rotor section 5, a rotor section 5a made of a solid cylindrical magnetic material has multiple magnets 6a, 6b, 6c, 6d, 6e, ... arranged on its outer circumference in a direction oblique to the flow direction.

[0071] If the skew grooves 36 formed between the magnets 6a, 6b, 6c, 6d, 6e, ... which are arranged around the outer circumference of the cylindrical rotor portion 5a at predetermined intervals from each other in the circumferential direction become deeper, the torque that imparts thrust to the fluid can be increased.

[0072] In the embodiments shown in Figures 15 and 16, each magnet 6a to 6h is divided into two parts in the direction of fluid flow, such as magnet 6a1 and magnet 6a2, magnet 6b1 and magnet 6b2, and magnet 6c1 and magnet 6c2. The groove 38 formed between magnet 6a1 and magnet 6a2, which are divided in the direction of fluid flow, has a structure that promotes fluid flow, similar to the groove 37 formed between magnet 6a1 and magnet 6b1, which are adjacent in the circumferential direction.

[0073] Figure 20 shows another embodiment in which, as shown in Figures 15 and 16, a plurality of magnet rows extending parallel to the flow direction with a predetermined distance between them in the circumferential direction of the rotor 5 are arranged on the circumferential wall surface in a direction oblique to the flow direction, and the plurality of magnets are divided in the direction of fluid flow as magnet 6a1, magnet 6a2, magnet 6a3, magnet 6b1, magnet 6b2, magnet 6b3, ...

[0074] Among the multiple magnets 6 arranged on the circumferential wall surface of the rotor 5, with a predetermined distance between them in the circumferential direction and in a direction oblique to the fluid flow direction, no skew grooves are formed between adjacent magnets in the circumferential direction.

[0075] On the other hand, the skew grooves formed between adjacent magnets in the direction of fluid flow among the multiple magnets 6 arranged at predetermined intervals in the direction of fluid flow remain, and as a result, grooves extending obliquely to the direction of fluid flow are formed on the peripheral wall surface of the rotor portion 5.

[0076] In the embodiments shown in Figures 15 and 16, the skew grooves 36 that were formed between adjacent magnets 6a1 and 6b1, between magnets 6a2 and 6b2, and between magnets 6a3 and 6b3 in the circumferential direction are filled in in the embodiment shown in Figure 20. On the other hand, the skew grooves 38 that were formed between adjacent magnets 6a1 and 6a2, between magnets 6a2 and 6a3, between adjacent magnets 6b1 and 6b2, and between adjacent magnets 6b2 and 6b3, which are separated in the flow direction, remain formed.

[0077] Because of this structure, the skew groove is not filled in the area indicated by reference numeral 39 in Figure 20.

[0078] In the embodiment shown in Figure 20, the skew groove 38 has a structure that promotes fluid flow.

[0079] Various materials can be used as the filling material 70 for the skew grooves 36 formed between adjacent magnets 6a1 and 6b1, between magnets 6a2 and 6b2, and between magnets 6a3 and 6b3 in the circumferential direction, as long as they are permeable to magnetism. For example, permeable synthetic resins, adhesives, ceramics, aluminum materials, etc., can be used to fill the skew grooves 36.

[0080] As described above, in this embodiment, the fluid transfer device has magnets that extend obliquely to the direction of fluid flow (from right to left in Figure 3) and are arranged on the outer circumferential wall surface of the rotor section 5. These magnets rotate in the circumferential direction indicated by arrow 40 on the rotor section 5, thereby providing a thrust force to the fluid flowing inside the fluid transfer pipe from right to left in Figure 3. Therefore, the fluid transfer device in this embodiment functions as a so-called screw pump.

[0081] As shown in Figures 3, 12-16, 19, and 20, the magnets 6 are positioned on the outer circumferential wall surface of the rotor section 5, extending obliquely to the direction of fluid flow (from right to left in Figure 3). This allows for more effective application of thrust to the fluid flowing from right to left in Figure 3 inside the fluid transfer pipe due to the circumferential rotation of the rotor section 5, indicated by arrow 40. The arrangement of magnets 6a-6h as exemplified in Figure 3 allows for more effective application of the aforementioned thrust by the rotation of multiple magnets 6a-6h in the circumferential direction as the rotor section 5 rotates around the rotation support shaft 9.

[0082] Figure 21 is a conceptual diagram illustrating a preferred arrangement of magnets 6, as described above, which are arranged on the outer circumferential wall surface of the rotor 5 in a manner that is oblique to the direction of fluid flow, with multiple rows of magnets extending parallel to the direction of fluid flow and spaced apart in the circumferential direction. In Figure 21, only the arrangement of magnets 6a and 6b that are adjacent in the circumferential direction is conceptually explained.

[0083] An angle, indicated by θ in Figure 19, is formed between the line segment 101, which extends diagonally between magnets 6a and 6b and intersects the fluid flow direction indicated by arrow 100, and the fluid flow direction 50.

[0084] According to the inventor's research, it was desirable to set the angle θ between 5 and 85 degrees. A smaller angle θ can increase the fluid flow rate, but an angle θ less than 5 degrees is undesirable because it reduces the pump's function. On the other hand, a larger angle θ increases the pressure on the liquid flow. An angle θ exceeding 85 degrees is undesirable because the pressure on the liquid flow becomes too high and obstructs the flow direction. From this viewpoint, it is more desirable to set the angle θ between 10 and 80 degrees.

[0085] Furthermore, the larger the angle θ, the greater the flow resistance from the fluid. Conversely, the smaller the angle θ, the smaller the flow resistance from the fluid.

[0086] Therefore, by selecting an angle θ that takes into account the physical properties of the fluid being flowed, the transfer effect (pump effect) of the fluid transfer device in this embodiment can be adjusted.

[0087] Corresponding to the preference that the magnet 6 is configured such that, as described above, multiple rows of magnets are arranged on the outer circumferential wall surface of the rotor 5, with predetermined spacings between them in the circumferential direction, and are parallel to the direction of fluid flow, and are arranged obliquely to the direction of fluid flow, the coil windings constituting the cylindrical coil 4 can also be wound obliquely to the direction of fluid flow.

[0088] Figure 17(a) is a conceptual diagram, partially omitted, illustrating a structure in which, in a fluid transfer device according to one embodiment of the present invention, a plurality of magnets 6a to 6h that form an annular cross-sectional magnetic field are arranged extending obliquely to the fluid flow direction indicated by arrow 45, and the coil winding constituting the cylindrical coil 4 is wound not obliquely to the fluid flow direction. The magnets and coil are shown unfolded from the rotational axis, with only half of the magnet's circumference omitted. Similarly, Figure 17(b) shows the magnets and coil unfolded from the rotational axis, with only half of the magnet's circumference omitted, but it is a conceptual diagram, partially omitted, illustrating a structure in which a plurality of magnets 6a to 6h are arranged extending obliquely to the fluid flow direction indicated by arrow 45, and the coil winding constituting the cylindrical coil 4 is also wound obliquely to the fluid flow direction indicated by arrow 45.

[0089] In Figure 17(b), both are inclined in the same direction with respect to the fluid flow direction indicated by arrow 45, and the angle at which the multiple magnets 6a to 6h are inclined with respect to the fluid flow direction indicated by arrow 45 is the same as the angle at which the coil windings constituting the cylindrical coil 4 are inclined with respect to the fluid flow direction indicated by arrow 45.

[0090] Although the inclination of both components is in the same direction with respect to the fluid flow direction indicated by arrow 45, it is also possible to arrange them in a configuration where the angles of inclination of both components are different. By having the inclination of both components be in the same direction with respect to the fluid flow direction indicated by arrow 45, but with different angles of inclination, the rotation of the rotor 5 in the direction indicated by arrow 44 can be made smoother.

[0091] In the cylindrical coil 4 illustrated in Figures 7 to 11, the first axial winding portion 55 and the second axial winding portion 56 of each individual coil 50 extend in the direction in which the axis 60 of the cylindrical coil 4 extends, that is, in the direction in which the rotational support shaft 9 (Figure 1), which is the direction in which the fluid flows through the fluid transfer pipe, extends. In this configuration, the coil windings constituting the coil 4 can be structured to be wound in the direction in which the fluid flows.

[0092] Furthermore, the coil windings constituting the coil 4 can also be structured so that they are wound obliquely to the direction in which the fluid flows. The direction in which the first axial winding portion 55 and the second axial winding portion 56 extend is oblique to the direction in which the fluid flows. For example, within the range of angles from 0 degrees relative to the direction in which the magnet 6 extends obliquely to the direction in which the fluid flows as described above, the direction in which the first axial winding portion 55 and the second axial winding portion 56 extend is oblique to the direction in which the fluid flows. Figure 18 is a conceptual diagram illustrating the relationship between the direction in which the axis 60 of the coil 4 extends, that is, the direction in which the first axial winding portion 55 and the second axial winding portion 56, which constitute the part extending in the direction in which the fluid flows within the fluid transfer pipe, extend, and the direction in which the magnet is positioned, in a single coil 50 (Figure 10) constituting the hollow cylindrical coil 4 shown in Figure 7.

[0093] In the arrangement shown in Figure 18(a), both the first axial winding section 55 and the second axial winding section 56, as well as the magnets 6a, 6b, and 6c, extend in the direction of fluid flow within the fluid transfer pipe. This is the most basic arrangement, and the magnets and the individual coils have the same width (electrical angle).

[0094] Figure 18(b) shows a configuration in which, compared to the arrangement in Figure 18(a), only the magnets 6a, 6b, and 6c are positioned obliquely to the direction of fluid flow. This arrangement is advantageous for the magnets 6a, 6b, and 6c, which rotate with the rotation of the rotor 5, to function as blades or propellers that provide thrust in the direction of fluid flow.

[0095] However, the arrangement of the magnets 6a, 6b, and 6c with respect to the direction in which the first axial winding portion 55 and the second axial winding portion 56 of the coil unit 50 extend is such that the magnets 6a, 6b, and 6c are arranged at an oblique angle with respect to the direction in which the first axial winding portion 55 and the second axial winding portion 56 of the coil unit 50 extend.

[0096] Therefore, as a fluid transfer device that applies thrust to the fluid flowing inside the fluid transfer pipe by the rotation of the rotor section 5, the efficiency is lower than that of the arrangement shown in Figure 18(a).

[0097] In Figure 18(c), compared to the arrangement in Figure 18(a), the magnets 6a, 6b, and 6c, as well as the direction in which the first axial winding portion 55 and the second axial winding portion 56 of the coil unit 50 extend, are arranged obliquely to the direction of fluid flow. The coil windings constituting the coil are wound obliquely to the direction of fluid flow in the same inclination direction as the magnets are inclined with respect to the direction of flow.

[0098] As shown in the arrangement in Figure 18(a), the magnet and the coil are given the same width (electrical angle), ensuring efficiency as a fluid transfer device by providing thrust to the fluid flowing inside the fluid transfer pipe through the rotation of the rotor section 5.

[0099] Furthermore, the magnets 6a, 6b, and 6c, which rotate in conjunction with the rotation of the rotor section 5, are arranged in a configuration that is advantageous for their role as blades or propellers that provide thrust in the direction of fluid flow.

[0100] In this embodiment, the fluid transfer device comprises a rotor section 5 with magnets 6 on its peripheral wall, and a hollow cylindrical coil 4 extending coaxially with respect to the rotor section 5 in the direction in which the fluid flows through the annular magnetic field formed by the magnets 6. When this device is made of a coreless motor, as described above, by employing a hollow cylindrical coil made by winding wire and arranged concentrically with respect to the rotation axis, a structure in which the coil windings constituting the coil are wound obliquely with respect to the direction of fluid flow can be easily and accurately prepared.

[0101] Generally, coreless motors lack an iron core, making it difficult to manufacture them by winding the coil wires that constitute the cylindrical coil at an angle to the direction in which the cylindrical coil extends. In contrast, in this embodiment, by creating a hollow cylindrical coil 4 with the structure described using Figures 7 to 11, a structure in which the coil windings constituting the coil are wound at an angle to the direction of fluid flow can be easily and accurately prepared.

[0102] Each magnet 6 can be fixed to the outer circumferential wall surface of the rotor 5 by adhesive, but it can also be attached to the rotor 5 by screws or other means. If the centrifugal force caused by the rotation of the rotor 5 tries to detach the magnets 6 from the outer circumferential wall surface of the rotor, screw fastening provides reinforcement.

[0103] (Second Embodiment) As explained with reference to Figure 19 in the first embodiment, if the skew grooves 36 formed between the magnets 6a, 6b, 6c, 6d, 6e, ... which are arranged around the outer circumference of the cylindrical rotor portion 5a at predetermined intervals from each other in the circumferential direction become deeper, the torque that imparts thrust to the fluid can be increased.

[0104] Therefore, instead of defining the depth of the skew groove solely by the radial thickness of the magnets 6 arranged on the outer circumference of the rotor sections 5 and 5a, a support section is formed on the outer circumference of the rotor sections 5 and 5a to support the magnets 6 or to serve as a base for the magnets 6, and the magnets are arranged radially outward from these support sections.

[0105] A support portion made of a magnetic material (for example, iron) is interposed between the outer circumference of the rotor portions 5 and 5a in the radial direction and the magnet 6, thereby raising the radial position of the magnet 6.

[0106] Parts common to the fluid transfer device of the first embodiment described using Figures 1 to 4 and Figures 7 to 21 will be referred to by the same reference numerals and their explanations will be omitted. An example of this embodiment will be explained by illustrating only the characteristic parts of this embodiment in Figures 22(a) and (b).

[0107] In the embodiment shown in Figure 22, an iron pipe 3a made of electromagnetic steel sheet is arranged around the inner circumference of the stator section 3. While this structure is advantageous for forming an annular cross-sectional magnetic field between the stator section 3 and the rotor section 5a, it is also possible to have a configuration in which the iron pipe 3a made of electromagnetic steel sheet is not arranged around the inner circumference of the stator section 3.

[0108] As shown in Figure 22(b), a support portion 71 made of a magnetic material (for example, iron) is interposed between the outer circumference of the rotor portion 5a and the magnet 6 to enable the formation of a magnetic path.

[0109] This increases the depth of the skew grooves 36 and 38, thereby increasing the torque that imparts thrust to the fluid, and making the fluid transfer device of the first embodiment, which functions as a screw pump, more advantageous.

[0110] Figure 23 illustrates another example of this embodiment. In the embodiment shown in Figure 22, both skew grooves 37 and skew grooves 38 were present, but in the embodiment shown in Figure 23, as in the embodiment shown in Figure 20, the portion corresponding to skew groove 36 is filled with the member 70 described in the embodiment of Figure 20, leaving only skew groove 38. The skew groove 38, which forms grooves extending in a direction oblique to the fluid flow direction, is formed on the peripheral wall surface of the rotor portion 5a.

[0111] In this structure, as explained in the embodiment shown in Figure 20, the grooves formed on the peripheral wall surface of the rotor portion 5a by the skew grooves 38, which extend in a direction oblique to the direction of fluid flow, promote fluid flow.

[0112] (Third embodiment) Other embodiments of the fluid transfer device of the present invention will be described with reference to Figures 5 and 6.

[0113] The fluid transfer apparatus of the first and second embodiments described using Figures 1 to 4, 7 to 21, and 22 uses common reference numerals for parts that are common to both and their descriptions are omitted.

[0114] The fluid transfer devices shown in Figures 5 and 6 also provide a thrusting force in the direction of flow to the fluid flowing inside the fluid transfer pipe, which is made of a cylindrical body. The fluid transfer device 1 shown in Figure 5 is configured to be installed inside the cylindrical part 20. Although not shown in the figure, the cylindrical part 20 is connected to the fluid transfer pipe, which is made of a cylindrical body through which the fluid flows, on the left and right sides of the figure, respectively.

[0115] The fluid transfer device of this embodiment also includes a magnetic body that forms a magnetic field with an annular cross-section, and a cylindrical coil that extends in the direction in which the cylindrical body extends within the annular magnetic field formed by the magnetic body.

[0116] In the illustrated embodiment, a magnetic field with an annular cross-section is formed between a cylindrical outer yoke 27 extending in the direction in which the cylindrical body constituting the fluid transfer device extends, and a cylindrical inner yoke 28 extending coaxially with respect to the outer yoke 27 in the direction in which the cylindrical body extends, located radially inside the outer yoke 27. Within this magnetic field with an annular cross-section, as shown in Figure 5, the cylindrical coil 4 extends in the direction in which the cylindrical body constituting the fluid transfer pipe extends.

[0117] In the illustrated embodiment, a magnet is placed on the inner circumferential wall surface of the outer yoke 27, which faces the inner yoke 28. As a result, a magnetic field with an annular cross-section is formed between the outer yoke 27 and the inner yoke 28 by the magnet.

[0118] In the illustrated embodiment, the rotational axis 24 is rotatably arranged with respect to the cylindrical portion 20, coaxially with the outer yoke 27, the cylindrical coil 4, and the inner yoke 28, on the radially inner side of the cylindrical portion 20.

[0119] The central axis of rotation 24 is rotatably supported at both ends in the axial direction via bearings 32a and 32b on the radially inward side of support portions 22 and 23 that extend radially inward from the inner circumferential wall surface of the cylindrical portion 20.

[0120] The inner yoke 28 is supported by support arms 30a, 30b, ..., 30e, 30f that extend radially outward from the rotational axis 24, and rotates circumferentially within the cylindrical portion 20 together with the rotational axis 24.

[0121] The outer yoke 27 is supported by the radially outer side of a support arm 29, whose radially inner side is rotatably supported on the rotational axis 24 via a bearing 32c.

[0122] The magnetic body, which is arranged on the inner circumferential wall surface of the outer yoke 27 facing the inner yoke 28 and forms an annular cross-sectional magnetic field between the outer yoke 27 and the inner yoke 28, is composed of a plurality of magnets 6a, 6b, 6c, 6d, 6e, 6f, 6g, and 6h arranged at predetermined intervals from each other in the circumferential direction, similar to the first embodiment (Figure 6). The plurality of magnets 6a to 6h are configured such that south pole magnets and north pole magnets are alternately arranged at predetermined intervals from each other in the circumferential direction.

[0123] The cylindrical coil 4, which extends in the direction in which the cylindrical body constituting the fluid transfer pipe extends within the annular cross-sectional magnetic field formed between the outer yoke 27 and the inner yoke 28, is arranged coaxially with respect to the outer yoke 27 and the inner yoke 28, similar to the first embodiment. The coil support portion 25, which extends radially inward from the inner circumferential wall surface of the cylindrical portion 20, allows the cylindrical coil 4 to be arranged coaxially with respect to the outer yoke 27 and the inner yoke 28.

[0124] Similar to the first embodiment, when current is applied to the coil 4, under conditions where an annular cross-sectional magnetic field is formed between the outer yoke 27 and the inner yoke 28 that sandwich the cylindrical coil 4 radially between them, the outer yoke 27 rotates circumferentially about the rotational axis 24 by the principle of a motor.

[0125] As a result, multiple magnets 6a to 6h also rotate circumferentially around the rotational axis 24, thereby imparting a propulsive force in the direction of flow to fluids such as liquids and gases flowing inside the fluid transfer pipe.

[0126] Similar to the first embodiment, multiple magnets 6a to 6h that rotate circumferentially around the rotational axis 24 together with the rotation of the outer yoke 27 act as blades or propellers that provide a thrusting force that flows in the direction of fluid flow.

[0127] In the illustrated embodiment, a magnet is arranged on the inner circumferential wall surface of the outer yoke 27, which rotates circumferentially with respect to the rotational axis 24, and an annular cross-sectional magnetic field is formed between the inner yoke 28, which does not rotate with respect to the rotational axis 24, and the outer yoke 27. In contrast, although not shown, the radially inner sides of the support arms 30a, ... 30f, which support the inner yoke 28 on the radially outer side, are supported via bearings so as to be circumferentially rotatable with respect to the rotational axis 24, and the magnet that forms the annular cross-sectional magnetic field described above is arranged on the outer circumferential wall surface of the inner yoke 28, which is opposite the inner circumferential wall surface of the outer yoke 27.

[0128] In this way, when current is applied to the coil 4, the inner yoke 28 rotates circumferentially around the rotation axis 24 according to the motor principle, and the multiple magnets 6a to 6h that make up the magnet body arranged on the outer circumferential wall surface of the inner yoke 28 rotate circumferentially around the rotation axis 24, thereby imparting a propulsive force in the direction of flow to the fluid, such as liquid or gas, flowing inside the fluid transfer pipe.

[0129] Furthermore, although not shown in the diagram, a configuration can also be made in which magnets are placed on both the inner circumferential wall surface of the outer yoke 27 facing the inner yoke 28 and the outer circumferential wall surface of the inner yoke 28 facing the outer yoke 27, thereby forming an annular magnetic field between the outer yoke 27 and the inner yoke 28.

[0130] In each embodiment, an annular cross-sectional magnetic field is formed between the outer yoke 27 and the inner yoke 28. By energizing the cylindrical coil 4 sandwiched between the outer yoke 27 and the inner yoke 28, the aforementioned magnetic field is formed by the principle of a motor, and multiple magnets 6, which are spaced apart from each other in the circumferential direction, rotate circumferentially around the rotational axis 24. This imparts a propulsive force in the direction of flow to the fluid, such as liquid or gas, flowing inside the fluid transfer pipe.

[0131] In the case where the outer yoke 27, on which multiple magnets 6 are arranged on its inner circumferential wall surface, rotates circumferentially around the rotational axis 24 by the principle of a motor as described above, the inner yoke 28 can also be configured to be supported by the rotational axis 24 so as to be circumferentially rotatable with respect to the rotational axis 24.

[0132] Similarly, if the inner yoke 28, on which multiple magnets 6 are arranged on the outer peripheral wall surface, is configured to rotate circumferentially around the rotational axis 24 by the principle of a motor as described above, then the outer yoke 27 can also be configured to be supported by the rotational axis 24 so as to be circumferentially rotatable with respect to the rotational axis 24.

[0133] In these cases, a magnetic circuit is formed by the formation of an annular cross-sectional magnetic field between the outer yoke 27 and the inner yoke 28. Therefore, when the outer yoke 27 or inner yoke 28, which is equipped with multiple magnets 6, rotates circumferentially about the rotational axis 24, the other inner yoke 28 or outer yoke 27 will also rotate in the same circumferential direction, but at a slower rotational speed than the rotational speed of the outer yoke 27 or inner yoke 28 equipped with multiple magnets 6.

[0134] In this embodiment as well, as described in the first embodiment above, the magnets 6 are arranged so that they extend obliquely to the direction of fluid flow along the inner circumferential wall of the outer yoke 27 and the outer circumferential wall of the inner yoke 28, and are positioned at a predetermined distance from each other in the circumferential direction of the outer yoke 27 and the inner yoke 28, thereby making the application of the thrust described above more effective.

[0135] Furthermore, as explained using Figure 21, the angle θ formed between a line segment extending obliquely in the direction of fluid flow between adjacent magnet rows in the circumferential direction and the direction of fluid flow can be set to a range of 5 to 85 degrees.

[0136] Furthermore, as described in the first embodiment, the coil windings constituting the coil 4 can also be wound obliquely to the direction in which the fluid flows.

[0137] Furthermore, each magnet 6 can be attached not only by adhesive fixing to the inner circumferential wall of the outer yoke 27 or the outer circumferential wall of the inner yoke 28, but also by screwing it in. In particular, screwing the magnet 6 to the outer circumferential wall of the inner yoke 28 provides reinforcement against the force that would cause the magnet 6 to detach from the outer circumferential wall of the inner yoke 28 due to the centrifugal force generated by the rotation of the inner yoke 28.

[0138] (Fourth embodiment) The fluid transfer device and screw pump of the present invention, as described in the first to third embodiments, are cylindrical bodies through which fluid is transferred, and comprise a magnetic body that forms an annular cross-section magnetic field, and a cylindrical coil that extends in the direction in which the cylindrical body extends within the annular cross-section magnetic field formed by the magnetic body. The magnetic body is formed from a plurality of magnets arranged at predetermined intervals from each other in the circumferential direction of a central axis extending from the center of the cylindrical body. By energizing the coil, the plurality of magnets constituting the magnetic body rotate in the circumferential direction according to the principle of a motor, and this circumferentially rotating magnetic body acts as blades or a propeller that provide a thrusting force to the fluid in the direction of flow.

[0139] The structure of such fluid transfer devices, or screw pumps, is what is known as a coreless motor structure.

[0140] The structure of the motor is basically the same as that of the generator. In the structure of the coreless motor that constitutes the fluid transfer device and screw pump of the present invention described in the first to third embodiments, the generator is one in which power is generated by the rotation of the rotor parts 5 and 5a by the input rotational force in the circumferential direction.

[0141] Therefore, in the present invention, it is possible to provide an embodiment of a generator that serves as both a fluid transfer device and a screw pump, having the above-described configuration and structure.

[0142] Figure 24 is a conceptual diagram illustrating one embodiment of such a power generation device that also serves as a fluid transfer device.

[0143] A first water source 80, located in a low-lying area, and a second water source 81, located in a higher area relative to the first water source 80, are connected by a water conduit 83 in which a switching valve 82 is interposed. Furthermore, the fluid transfer device and screw pump 84 of the present invention, as described in the first to third embodiments, are installed in the water conduit 83 between the switching valve 82 and the first water source 80.

[0144] When pumping water from the first water source 80 to the second water source 81 as indicated by arrow 85, the fluid transfer device and screw pump 84 described in the first to third embodiments are operated so that the water flows through the water conduit 83 in the direction indicated by arrow 85.

[0145] On the other hand, when water is flowed from the second water source 81 to the first water source 80 as indicated by arrow 86, the water flowing through the water conduit 83 causes the rotor sections 5, 5a of the fluid transfer device and screw pump 84 described in the first to third embodiments to rotate in the circumferential direction. This allows the fluid transfer device and screw pump 84 described in the first to third embodiments to function as a generator for generating electricity.

[0146] Thus, according to the present invention, it becomes possible to use a fluid transfer device, a screw pump, and a generator in the same unit.

[0147] Although embodiments of the present invention have been described above with reference to the attached drawings, the present invention is not limited to the embodiments described above and can be modified in various ways within the technical scope as understood from the claims.

Claims

1. A fluid transfer device that provides a propulsive force in the direction of flow to a fluid flowing inside a fluid transfer tube consisting of a cylindrical body, The system comprises a magnetic body that forms a magnetic field with an annular cross-section, and a cylindrical coil that extends in the flow direction within the annular magnetic field formed by the magnetic body and is located in the fluid flowing inside the fluid transfer pipe. The magnetic field, which has an annular cross-section, is formed between a cylindrical stator portion and a cylindrical rotor portion that are arranged coaxially with the cylindrical coil, extending in the flow direction with the cylindrical coil sandwiched between them radially. The cylindrical rotor portion is supported so as to be rotatable in its circumferential direction by a rotating support portion located in the fluid flowing inside the fluid transfer pipe. The aforementioned magnet body consists of a plurality of magnets arranged on the peripheral wall surface of the rotor portion facing the stator portion, with the cylindrical coil sandwiched in between. Multiple rows of magnets extending parallel to the flow direction with a predetermined distance between them in the circumferential direction of the rotor are arranged on the circumferential wall surface in a direction oblique to the flow direction, thereby forming a plurality of magnets. Between adjacent magnet rows in the circumferential direction, the angle θ formed between a line segment extending obliquely in the flow direction and the flow direction is in the range of 5 to 85 degrees. By energizing the cylindrical coil, the multiple magnets constituting the magnet body rotate in the circumferential direction, thereby imparting the propulsive force. Fluid transfer device.

2. The fluid transfer device according to claim 1, wherein each of the magnet rows is the same shape and size as the others.

3. Each of the aforementioned magnet rows is formed by arranging multiple magnets at predetermined intervals between adjacent magnets in the flow direction. The fluid transfer device according to claim 2.

4. Among the multiple magnets arranged on the circumferential wall surface of the rotor portion, with a predetermined distance between them in the circumferential direction and in a direction oblique to the flow direction, no grooves are formed between adjacent magnets in the circumferential direction. The grooves formed between adjacent magnets in the flow direction remain, as a result of the grooves extending obliquely to the flow direction being formed on the peripheral wall surface of the rotor portion. The fluid transfer device according to claim 3.

5. The fluid transfer device according to claim 3 or 4, wherein a support material is interposed between the rotor portion and the magnet to raise the radial position of the magnet.

6. The fluid transfer device according to any one of claims 1 to 4, wherein the coil winding constituting the cylindrical coil is wound obliquely to the flow direction of the fluid in the same inclination direction as the direction in which the magnet row is inclined with respect to the flow direction.

7. The fluid transfer device according to claim 1 or 2, wherein each of the multiple magnet rows is screwed to the peripheral wall surface of the rotor portion.

8. A fluid transfer device that provides a propulsive force in the direction of flow to a fluid flowing inside a fluid transfer tube consisting of a cylindrical body, The system comprises a magnetic body that forms a magnetic field with an annular cross-section, and a cylindrical coil that extends in the flow direction within the annular magnetic field formed by the magnetic body and is located in the fluid flowing inside the fluid transfer pipe. The magnetic field, which has an annular cross-section, is formed between a cylindrical outer yoke and a cylindrical inner yoke, which extend in the flow direction and are arranged coaxially with the cylindrical coil, with the cylindrical coil sandwiched between them radially. The cylindrical outer yoke and the cylindrical inner yoke are supported so as to be rotatable in their circumferential direction by a rotating support located in the fluid flowing inside the fluid transfer pipe. The magnetic body consists of a plurality of magnets that are positioned opposite each other with the cylindrical coil in between, on the inner circumferential wall surface of the outer yoke, or on the outer circumferential wall surface of the inner yoke, or on both the inner circumferential wall surface of the outer yoke and the outer circumferential wall surface of the inner yoke. Multiple magnets are arranged on the inner circumferential wall surface of the outer yoke, with a predetermined spacing between them in the circumferential direction of the outer yoke and extending parallel to the flow direction, and in a direction oblique to the flow direction, thereby forming a plurality of magnets, or Multiple magnets are arranged on the outer circumferential wall surface of the inner yoke, with a predetermined distance between them in the circumferential direction of the inner yoke and extending parallel to the flow direction, and in a direction oblique to the flow direction, thereby forming a plurality of magnets, or Multiple magnet rows are arranged on the inner circumferential wall surface of the outer yoke, extending parallel to the flow direction with predetermined spacings between them in the circumferential direction of the outer yoke, and are positioned obliquely to the flow direction. Similarly, multiple magnet rows are arranged on the outer circumferential wall surface of the inner yoke, extending parallel to the flow direction with predetermined spacings between them in the circumferential direction of the inner yoke, and are positioned obliquely to the flow direction, thereby forming a plurality of magnets. Between adjacent magnet rows in the circumferential direction, the angle θ formed between a line segment extending obliquely in the flow direction and the flow direction is in the range of 5 to 85 degrees. By energizing the cylindrical coil, the multiple magnets constituting the magnet body rotate in the circumferential direction, thereby imparting the propulsive force. Fluid transfer device.

9. The fluid transfer device according to claim 8, wherein each of the magnet rows is the same shape and size as the others.

10. Each of the aforementioned magnet rows is formed by arranging multiple magnets at predetermined intervals between adjacent magnets in the flow direction. The fluid transfer device according to claim 9.

11. A generator that also serves as a fluid transfer device, comprising the structure described in claim 1 or claim 8.

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