Fluid transfer device

Abstract

To provide a fluid transfer device which applies a propulsive force to fluid.SOLUTION: A fluid transfer device comprises a magnet body forming a magnetic field with an annular-shaped cross section, and a cylindrical coil extending in a direction in which a cylindrical body extends in the magnetic field. The magnetic field is formed between a cylindrical stator part and a cylindrical rotor part extending in the direction in which the cylindrical body extends by sandwiching the coil between each other in a radial direction, and the magnet body is composed of a plurality of magnets which are arranged with a prescribed space between each other in a circumferential direction on a peripheral wall surface of the rotor part. Or the magnetic field is formed between a cylindrical outer yoke and a cylindrical inner yoke extending in the direction in which the cylindrical body extends by sandwiching the coil between each other in the radial direction, and the magnet body is composed of a plurality of magnets which are arranged with a prescribed space between each other in the circumferential direction on an inner peripheral wall surface of the outer yoke or an outer peripheral wall surface of the inner yoke, or both the inner peripheral wall surface of the outer yoke and the outer peripheral wall surface of the inner yoke. The plurality of magnets constituting the magnet body is rotated in the circumferential direction by energizing the coil, and a propulsive force is applied thereto.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a fluid transfer device that applies a driving force to a fluid, such as a liquid or gas, flowing inside a fluid transfer pipe in the direction of flow. [Background technology]

[0002] An axial flow pump is known as a fluid transfer device that provides a driving force to a fluid, such as a liquid flowing inside a fluid transfer pipe, in the direction of the flow. An axial flow pump sends out a fluid in the direction of its central axis of rotation, and is known to be used, for example, to circulate cooling water in automobile engines (Patent Document 1).

[0003] The axial flow pump of Patent Document 1 is composed 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. Rotating blades that are disposed between the rotating shaft and the rotor and connect the rotating shaft and the rotor rotate with the rotation of the rotor, thereby applying a driving force to the fluid inside the cylindrical case in the flow direction. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 9-228977 Summary of the Invention [Problem to be solved by the invention]

[0005] An object of the present invention is to provide a fluid transfer device that imparts a driving force to a fluid, such as a liquid or gas, flowing inside a fluid transfer pipe in the direction of flow. [Means for solving the problem]

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

[0007] The fluid transfer device is a cylindrical body through which the fluid is transferred, and is equipped with a magnet body that forms a magnetic field with a circular cross section, and a cylindrical coil that extends in the direction of extension of the cylindrical body within the magnetic field with a circular cross section formed by the magnet body.

[0008] The magnetic body that forms the magnetic field having a circular cross section is formed from a plurality of magnets that are arranged at predetermined intervals from one another in the circumferential direction of a central axis that extends through the center of the cylindrical body.

[0009] By passing current through the cylindrical coil, the magnets constituting the magnetic body rotate in the circumferential direction according to the principle of a motor, thereby providing the fluid with a driving force to flow in the flow direction.

[0010] A plurality of magnets that rotate around the central axis of the cylindrical body through which the fluid is transported act as blades or propellers that provide the fluid with a driving force to move in the direction of flow.

[0011] The fluid transfer device of the present invention is typified by the following aspects. [1] A fluid transfer device that applies a propulsive force in the direction of flow to a fluid flowing inside a fluid transfer pipe made of a cylindrical body, The magnetic field has a circular cross section, and the coil extends in the direction of extension of the cylindrical body through the magnetic field having a circular cross section formed by the magnetic body. The magnetic field having a circular cross section is formed between a cylindrical stator portion and a cylindrical rotor portion that extend in the extension direction of the cylindrical body with the coil sandwiched between them in the radial direction, the magnet body is composed of a plurality of magnets arranged at predetermined intervals in the circumferential direction on a peripheral wall surface of the rotor section facing the stator section with the coil interposed therebetween, When the coil is energized, the magnets constituting the magnetic body rotate in the circumferential direction, thereby applying the driving force. Fluid transfer device.

[0012] [2] The plurality of magnets are arranged so as to extend obliquely across the peripheral wall surface of the rotor portion relative to the flow direction. [1] Fluid transfer device

[0013] [3] A fluid transfer device according to [2], wherein the coil winding constituting the coil is wound obliquely relative to the flow direction of the fluid in the same inclined direction as the magnet is inclined relative to the flow direction.

[0014] [4] The fluid transfer device according to any one of [1] to [3], wherein each of the plurality of magnets is screwed to the peripheral wall surface of the rotor portion.

[0015] [5] A fluid transfer device that applies a propulsive force in the direction of flow to a fluid flowing inside a fluid transfer pipe made of a cylindrical body, The magnetic field has a circular cross section, and the coil extends in the direction of extension of the cylindrical body through the magnetic field having a circular cross section formed by the magnetic body. The magnetic field having a circular cross section is formed between a cylindrical outer yoke and a cylindrical inner yoke that extend in the extension direction of the cylindrical body, with the coil sandwiched between them in the radial direction, the magnetic body is composed of a plurality of magnets arranged at predetermined intervals in the circumferential direction on the inner peripheral wall surface of the outer yoke or the outer peripheral wall surface of the inner yoke, or on both the inner peripheral wall surface of the outer yoke and the outer peripheral wall surface of the inner yoke, which face each other with the coil in between, When the coil is energized, the magnets constituting the magnetic body rotate in the circumferential direction, thereby applying the driving force. Fluid transfer device.

[0016] [6] The plurality of magnet bodies are arranged so as to extend obliquely along the inner peripheral wall surface of the outer yoke relative to the flow direction, or The plurality of magnet bodies are arranged to extend obliquely along the outer peripheral wall surface of the inner yoke relative to the flow direction, or The plurality of magnetic bodies are each arranged to extend obliquely along the inner peripheral wall surface of the outer yoke relative to the flow direction, and are also arranged to extend obliquely along the outer peripheral wall surface of the inner yoke relative to the flow direction.

[0017] [7] A fluid transfer device according to [6], wherein the coil winding constituting the coil is wound obliquely relative to the flow direction of the fluid in the same inclined direction as the magnet is inclined relative to the flow direction.

[0018] [8] Each of the plurality of magnet bodies is screwed to the outer yoke, or screwed onto the inner yoke, or The fluid transfer device according to any one of [5] to [7], which is screwed to the outer yoke and screwed to the inner yoke. [Effects of the Invention]

[0019] According to the present invention, it is possible to provide a fluid transfer device that applies a driving force to a fluid, such as a liquid or gas, flowing inside a fluid transfer pipe in the direction of flow. [Brief explanation of the drawings]

[0020] [Figure 1] 1 is a cross-sectional view of a fluid transfer device according to an embodiment of the present invention, with a portion thereof omitted; [Figure 2] 2 is a diagram showing the internal structure of the fluid transfer device shown in FIG. 1, with some parts omitted, as seen from the left to right direction in FIG. 1 (the direction indicated by arrow 41 in FIG. 1). FIG. [Figure 3] FIG. 2 is a partially omitted perspective view showing the internal structure of the fluid transfer device shown in FIG. [Figure 4] 2 is another perspective view showing the internal structure of the fluid transfer device shown in FIG. 1, with a portion thereof omitted. FIG. [Figure 5] FIG. 10 is a cross-sectional view of a fluid transfer device according to another embodiment of the present invention, with a portion thereof omitted. [Figure 6] FIG. 6 is a partially omitted perspective view showing the internal structure of the fluid transfer device shown in FIG. 5. [Figure 7] 1 is a partially omitted perspective view illustrating a schematic structure of an embodiment of a hollow cylindrical coil employed in a fluid transfer device according to an embodiment of the present invention; [Figure 8] 8 is a diagram showing an example of a cross-sectional structure of a wire material forming each of the multiple coil units that make up the coil shown in FIG. 7. [Figure 9] 8 is a view illustrating one embodiment of each of the multiple coil units constituting the coil shown in FIG. 7, viewed from a side direction (from the radial outside to the radial inside) perpendicular to the axial direction of the cylindrical coil. FIG. [Figure 10] 10(a) is a partially omitted view illustrating that the coil unit shown in FIG. 9 is formed by winding a wire material spirally multiple times around a winding axis, and FIG. 10(b) is a partially omitted view illustrating that the coil unit of an embodiment different from that shown in FIG. 10(a) is formed by winding a wire material spirally multiple times around a winding axis. [Figure 11] 10 is a diagram illustrating an example of a structure in which a cylindrical coil is formed from a plurality of coil units, and each coil unit is electrically connected to the next coil unit of the same phase in the circumferential direction. FIG. [Figure 12] FIG. 1 shows an example of an embodiment in which multiple magnets arranged on the peripheral wall surface of the rotor section, extending obliquely to the direction of fluid flow, act as blades or propellers that provide a driving force to the fluid in the direction of flow as the rotor section rotates, where (a) is a perspective view of the rotor section and (b) is a side view of the rotor section. [Figure 13]Figure 10 shows another example of an embodiment in which multiple magnets arranged on the peripheral wall surface of the rotor section, extending obliquely to the direction of fluid flow, act as blades or propellers that provide a driving force to the fluid in the direction of flow as the rotor section rotates, where (a) is an oblique view of the rotor section and (b) is a side view of the rotor section. [Figure 14] Figure 10 shows another example of an embodiment in which multiple magnets arranged on the peripheral wall surface of the rotor section, extending obliquely to the direction of fluid flow, act as blades or propellers that provide a driving force to the fluid in the direction of flow as the rotor section rotates, where (a) is an oblique view of the rotor section, (b) is a side view of the rotor section, and (c) is a right side view. [Figure 15] Figure 10 shows another example of an embodiment in which multiple magnets arranged on the peripheral wall surface of the rotor section, extending obliquely to the direction of fluid flow, act as blades or propellers that provide a driving force to the fluid in the direction of flow as the rotor section rotates, where (a) is an oblique view of the rotor section, (b) is a side view of the rotor section, and (c) is a right side view. [Figure 16] Figure 10 shows another example of an embodiment in which multiple magnets arranged on the peripheral wall surface of the rotor section, extending obliquely to the direction of fluid flow, act as blades or propellers that provide a driving force to the fluid in the direction of flow as the rotor section rotates, where (a) is an oblique view of the rotor section, (b) is a side view of the rotor section, and (c) is a right side view. [Figure 17] (a) A conceptual diagram with some parts omitted to illustrate the structure of a fluid transfer device according to one embodiment of the present invention, in which a plurality of magnets that form a magnetic field with a circular cross section are arranged to extend obliquely relative to the direction of fluid flow, and the coil windings that form the cylindrical coil are wound at a non-diagonal angle relative to the direction of fluid flow; (b) A conceptual diagram with some parts omitted to illustrate the structure of a fluid transfer device according to one embodiment of the present invention, in which a plurality of magnets that form a magnetic field with a circular cross section are arranged to extend obliquely relative to the direction of fluid flow, and the coil windings that form the cylindrical coil are also wound at a diagonal angle relative to the direction of fluid flow. [Figure 18]18(a) and 18(b) are conceptual diagrams illustrating the relationship between the direction in which the magnets are arranged and the direction in which the first axial winding portion and the second axial winding portion, which constitute the portion extending in the axial direction of the cylindrical coil, extend in the coil alone shown in FIG. 10 that constitutes the hollow cylindrical coil shown in FIG. 7; FIG. 18(a) is a conceptual diagram illustrating an arrangement in which the magnets, the first axial winding portion, and the second axial winding portion all extend in the axial direction; FIG. 18(b) is a conceptual diagram illustrating an arrangement in which, compared to the arrangement in FIG. 18(a), only the magnets are arranged obliquely relative to the axial direction; and FIG. 18(c) is a conceptual diagram illustrating an arrangement in which, compared to the arrangement in FIG. 18(a), the magnets, the first axial winding portion, and the second axial winding portion all extend obliquely relative to the axial direction. DETAILED DESCRIPTION OF THE INVENTION

[0021] (First embodiment) An embodiment of the fluid transfer device of the present invention will be described with reference to FIGS.

[0022] The fluid transfer device 1 shown in Figure 1 applies a driving force in the direction of flow to a fluid flowing inside a fluid transfer pipe made of a cylindrical body. Although not shown, in Figure 1, fluid transfer pipes made of cylindrical bodies (not shown) are continuous with the left side of the cylindrical portion 2a and the right side of the cylindrical portion 2b.

[0023] The fluid transfer device of this embodiment includes a magnet body that forms a magnetic field with a circular cross section, and a cylindrical coil that extends in the direction in which the cylindrical body extends within the magnetic field with a circular cross section formed by the magnet body.

[0024] In the illustrated embodiment, the cylindrical portion sandwiched between cylindrical portions 2a and 2b is the stator portion 3, and a cylindrical rotor portion 5 is arranged coaxially inside the stator portion 3.

[0025] A magnetic field with a circular cross section is formed between the stator section 3 and the rotor section 5, and within this magnetic field with a circular cross section, as shown in Figure 1, a cylindrical coil 4 extends in the same direction as the cylindrical body that constitutes the fluid transfer pipe.

[0026] In the illustrated embodiment, a magnet body is disposed on the outer peripheral wall surface of the rotor section 5, which faces the inner peripheral wall surface of the stator section 3. As a result, a magnetic field with a circular cross section is formed between the stator section 3 and the rotor section 5 by the magnet body.

[0027] Although not shown, the cylindrical portion 2a and the cylindrical portion 2b in FIG. 1 may be connected to form a fluid transfer pipe made of a cylindrical body, and the cylindrical stator portion 3 that constitutes the fluid transfer device 1 may be supported by a support cup that extends radially inward from the inner peripheral wall of the fluid transfer pipe and disposed inside the fluid transfer pipe.

[0028] The rotor section 5 is disposed coaxially with the stator section 3 and radially inside the stator section 3, and is disposed rotatably in the circumferential direction relative to the stator section 3.

[0029] In the illustrated embodiment, a rotary support shaft 9 extending in the fluid flow direction through the center of the stator section 3 is supported by support arms 8a, 8b, ... extending radially inward from the inner peripheral wall surface of the cylindrical section 2b. In this specification and drawings, the support arms 8a, 8b, ... may be collectively referred to as support arm 8.

[0030] A rotor support shaft 11 is rotatably supported at the tip end of the rotation support shaft 9. The rotor section 5 is supported by the radially outer portions 11d of rotor support arms 11a, 11b, and 11c, whose radially inner portions are supported by the rotor support shaft 11, and is thereby rotatable in the circumferential direction as shown by arrow 40 in Figure 2 around the rotation support shaft 9 and the rotor support shaft 11.

[0031] In the illustrated embodiment, the magnet body disposed on the outer peripheral wall surface of the rotor portion 5 and forming the above-described circular magnetic field is composed of a plurality of magnets 6a, 6b, 6c, 6d, 6e, 6f, 6g, and 6h arranged at predetermined intervals in the circumferential direction (FIG. 2). Each of the plurality of magnets 6a-6h can be configured to extend along the outer peripheral wall surface of the rotor portion 5 in the direction of fluid flow and be arranged at predetermined intervals in the circumferential direction of the rotor portion 5. The plurality of magnets 6a-6h are configured such that south-pole magnets and north-pole magnets are alternately arranged at predetermined intervals in the circumferential direction. Hereinafter, in this specification and drawings, the magnets 6a-6h may be collectively referred to simply as magnets 6.

[0032] Cylindrical coil 4 extends in the direction of extension of the cylindrical body constituting the fluid transfer pipe through the magnetic field having a circular cross section formed between stator section 3 and rotor section 5, and is arranged coaxially with stator section 3 and rotor section 5 as shown in Figure 1. Coil support sections 7a, 7b, and 7c extend radially inward from the inner circumferential wall surface of cylindrical section 2a, allowing cylindrical coil 4 to be arranged coaxially with stator section 3 and rotor section 5. In this specification and drawings, coil support sections 7a, 7b, and 7c may be collectively referred to as coil support section 7.

[0033] An example of a cylindrical coil 4 will be described with reference to Figures 7 to 11. The cylindrical coil 4 is hollow and can be formed from a plurality of coil units 50 (Figure 7). In this case, the peripheral wall 4a of the cylindrical coil 4 is formed by continuously arranging the plurality of coil units 50 in the circumferential direction of the cylindrical coil 4.

[0034] An example of the cylindrical coil 4 will be described with reference to Figures 7 to 11. As the cylindrical coil 4, a hollow cylindrical coil used in a motor, a generator, or the like can be used.

[0035] An example of a hollow cylindrical coil used in motors, generators, etc. is proposed in Japanese Patent No. 3704044. This hollow cylindrical coil body is formed by etching a conductive plate (e.g., a copper plate) to form a conductive band pattern on two thin metal plates, each of which is made into a cylinder, and then arranging the two cylinders concentrically as an inner cylinder and an outer cylinder.

[0036] Furthermore, Japanese Patent Application Laid-Open No. 2017-70140 proposes a hollow cylindrical coil body formed by folding a conductive sheet having a plurality of conductive bands and shaping the folded conductive sheet into a cylindrical shape.

[0037] The applicant's Japanese Patent Publication No. 6948748 and International Publication No. WO2021 / 152662A1 propose a hollow, cylindrical coil formed by winding wire concentrically around the rotating shaft of a rotating electric machine. This coil is configured such that a flat coil body is formed by winding wire multiple times in a spiral around a winding axis extending radially perpendicular to the rotating shaft, and multiple coils are arranged continuously circumferentially around the cylindrical coil body to surround the rotating shaft of the rotating electric machine. The wire is, for example, a bundle of conductive wires whose outer peripheries are covered with an enamel layer or the like, and then covered with a fibrous material such as glass fiber.

[0038] Here, an embodiment will be described in which a hollow cylindrical coil made by winding a wire rod and arranged concentrically with the rotation axis of the rotating electric machine is used as the cylindrical coil 4.

[0039] The cylindrical coil 4 is hollow and can be formed from multiple coil units 50 (FIG. 7). In this case, the multiple coil units 50 are continuously arranged in the circumferential direction of the cylindrical coil 4 to form the peripheral wall 4a of the cylindrical coil 4.

[0040] As an example, the coil unit 50 is made up of a conductive wire 51 whose periphery is insulated (FIG. 8). The wire 51 shown in FIG. 8 is made up of a bundle of copper wires 53 whose outer periphery is covered with an enamel layer 52, and these are covered with a fibrous material 54 such as glass fiber.

[0041] Before multiple coil units 50 are continuously arranged in the circumferential direction of the coil 4 to form the peripheral wall 4a of the hollow cylindrical coil 4, the coil unit 50 is a flat coil body as illustrated in Figure 9.

[0042] The flat coil unit 50 is formed by winding a wire 51 spirally multiple times around a winding axis 61 (Figs. 9 and 10) that is perpendicular to the direction in which the axis 60 (Fig. 7) of the cylindrical coil 4 extends, while leaving a hollow portion 59 on the side of the winding axis 61.

[0043] 9 and 10 illustrate and explain a flat coil unit 50 having 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.

[0044] The first axial winding portion 55 and the second axial winding portion 56 form portions of the cylindrical coil 4 in the direction in which the axis 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 axis 60 extends (the upper side in FIG. 9) and the 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 axis 60 extends (the lower side in FIG. 9) and the other side of the second axial winding portion 56.

[0045] 9 and 10, the first axial winding portion 55 and the second axial winding portion 56 extend linearly in the direction of extension of the axis 60 (FIG. 7) of the cylindrical coil 4. However, the present invention is not limited to such a structure or configuration, and it is also possible to employ a structure or configuration in which the windings extend in the direction of extension of the axis 60 (FIG. 7) in a curved, convex shape in the left-right direction in FIGS. 9 and 10. In this case, the windings will have an elliptical or oblong shape with a major axis formed by the axial winding portion in the up-down direction and a minor axis formed by the circumferential winding portion in the left-right direction in FIGS. 9 and 10.

[0046] When the fluid transfer device 1 is configured, for example, as a three-phase motor, the coil units 50 arranged in the circumferential direction of the cylindrical coil 4 each become a coil body constituting one of the U phase, V phase, or W phase.

[0047] In this case, as shown in Figure 11, multiple coil units 50 that are arranged continuously in the circumferential direction of the cylindrical coil 4 and form the cylindrical peripheral wall 4a of the coil 4 are electrically connected to the next coil unit 50 of the same phase in the circumferential direction.

[0048] FIG. 11 illustrates an example of this electrical connection configuration. In the figure, the elements designated by the reference numerals 50a to 50d each comprise a coil element 50, and form, for example, a U-phase in the cylindrical coil 4. As shown in the figure, the coil element 50a forming the U-phase is located next in the circumferential direction via the wire material 51a constituting the coil element 50a, and is electrically connected to the coil element 50b which also forms the U-phase. The coil element 50b is located next in the circumferential direction via the wire material 51b constituting the coil element 50b, and is electrically connected to the coil element 50c which also forms the U-phase. A similar structure is used for the V-phase and W-phase.

[0049] The cylindrical portion 2a is formed with an intake portion 12 (FIG. 1) for taking in control and drive conductors, through which a control signal cable and a power cable (not shown) are connected.

[0050] As described above, a magnetic field with a circular cross section is formed between the stator section 3 and the rotor section 5, which sandwich the coil 4 radially. When current is applied to the coil 4, the rotor section 5 rotates in the circumferential direction indicated by the arrow 40 in Figure 2 around the rotation support shaft 9 according to the principles of a motor.

[0051] As a result, the magnets 6a to 6h also rotate in the circumferential direction around the rotary support shaft 9, and a propulsive force is applied to the fluid, such as liquid or gas, flowing inside the fluid transfer pipe in the flow direction indicated by arrow 42 in Fig. 3. In Fig. 1, a propulsive force is applied in the flow direction from the left side to the right side of the drawing.

[0052] The plurality of magnets 6a to 6h that rotate in the circumferential direction of the rotor section 5 along with the rotation of the rotor section 5 act as blades or propellers that provide a driving force to the fluid to move in the flow direction.

[0053] When a fluid such as a liquid or gas flowing inside the fluid transfer pipe flows in the opposite direction to the direction indicated by arrow 42 in FIG. 3, by controlling the drive current to coil 4 to rotate rotor portion 5 in the circumferential direction opposite to that indicated by arrow 40, a propulsive force can be similarly applied to the fluid such as a liquid or gas flowing inside the fluid transfer pipe in the direction of flow.

[0054] As described above, the magnets 6a to 6h, which are arranged at predetermined intervals around the circumference of the cylindrical rotor section 5, act as blades or propellers that impart a driving force to the fluid flowing inside the fluid transfer pipe in the direction of flow.

[0055] Therefore, the magnets 6 can be arranged on the outer peripheral wall surface of the rotor section 5 so as to extend obliquely relative to the direction of fluid flow and to be spaced apart at a predetermined interval in the circumferential direction of the rotor section 5. Figure 3 illustrates an example of such an arrangement of magnets 6. Magnets 6a to 6h are arranged on the outer peripheral wall surface of the rotor section 5 so as to extend obliquely relative to the direction of fluid flow (from right to left in Figure 3), as shown in Figure 3.

[0056] As shown in Fig. 3, the magnets 6 are arranged on the outer peripheral wall surface of the rotor section 5, extending obliquely to the direction of fluid flow (from right to left in Fig. 3), so that the rotation of the rotor section 5 in the circumferential direction indicated by arrow 40 more effectively applies a propulsive force to the fluid flowing inside the fluid transfer pipe from right to left in Fig. 3. The arrangement of the magnets 6a-6h illustrated in Fig. 3 makes it possible to more effectively apply the propulsive force described above, which is caused by the rotation of the multiple magnets 6a-6h in the circumferential direction as the rotor section 5 rotates in the circumferential direction around the rotation support shaft 9.

[0057] Figures 12 to 16 show various modified examples of an embodiment in which a plurality of magnets 6a to 6h are arranged on the peripheral wall surface of the rotor section 5, extending obliquely to the direction of fluid flow, and function as blades or propellers that provide a driving force to the fluid to flow in the direction of flow as the rotor section 5 rotates.

[0058] Rotor unit 5 rotates in the direction of arrow 44 about its central rotation axis 43, and a flow driving force in the direction indicated by arrow 45 is applied to the fluid.

[0059] 15 and 16, each of the magnets 6a-6h is divided into two halves 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 formed between magnet 6a1 and magnet 6a2, which are divided into two halves in the direction of fluid flow, is a structure that promotes the flow of fluid, similar to the groove formed between magnet 6a1 and magnet 6b1, which are adjacent in the circumferential direction.

[0060] Similarly, the coil windings constituting the coil 4 can be wound obliquely to the direction in which the fluid flows.

[0061] FIG. 17(a) is a partially omitted conceptual diagram illustrating a structure of a fluid transfer device according to one embodiment of the present invention, in which multiple magnets 6a-6h that form a cross-sectionally annular magnetic field are arranged to extend obliquely relative to the fluid flow direction indicated by arrow 45, and the coil windings that form the cylindrical coil 4 are wound non-obliquely relative to the fluid flow direction. The magnets and coils are shown unfolded from the central axis of rotation, with only half of the magnets omitted. FIG. 17(b) is also a partially omitted conceptual diagram illustrating a structure in which multiple magnets 6a-6h are arranged to extend obliquely relative to the fluid flow direction indicated by arrow 45, and the coil windings that form the cylindrical coil 4 are also wound obliquely relative to the fluid flow direction indicated by arrow 45.

[0062] In Figure 17(b), both magnets are inclined in the same direction relative to the fluid flow direction indicated by arrow 45, and the angle at which the multiple magnets 6a to 6h are inclined relative 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 relative to the fluid flow direction indicated by arrow 45.

[0063] The inclination of both is in the same direction relative to the fluid flow direction indicated by arrow 45, but the inclination angles of both can also be different. By inclining both in the same direction relative to the fluid flow direction indicated by arrow 45 but at different inclination angles, it is possible to smoothly rotate rotor unit 5 in the direction indicated by arrow 44.

[0064] 7 to 11, the first axial winding portion 55 and the second axial winding portion 56 of each coil unit 50 extend in the direction in which the axis 60 of the cylindrical coil 4 extends, i.e., in the direction in which the rotation support shaft 9 (FIG. 1) extends, which is the direction in which the fluid flows through the fluid transfer pipe. In this manner, the coil winding that constitutes the coil 4 can be wound in the direction in which the fluid flows.

[0065] Furthermore, the coil winding constituting the coil 4 may be wound obliquely with respect to the direction of fluid flow. The extension directions of the first axial winding portion 55 and the second axial winding portion 56 are set to extend obliquely with respect to the direction of fluid flow. For example, the extension directions of the first axial winding portion 55 and the second axial winding portion 56 may be set to extend obliquely with respect to the direction of fluid flow within a range from 0 degrees with respect to the direction of fluid flow to the angle at which the magnet 6 extends obliquely with respect to the direction of fluid flow as described above. Figure 18 is a conceptual diagram illustrating the relationship between the direction in which the axis 60 of the coil 4 extends (i.e., the direction in which the first axial winding portion 55 and the second axial winding portion 56, which constitute the portion extending in the direction in which the fluid flows through the fluid transfer pipe), and the direction in which the magnets are arranged, in the coil unit 50 (Figure 10) that constitutes the hollow cylindrical coil 4 shown in Figure 7.

[0066] 18(a), first axial winding portion 55, second axial winding portion 56, and magnets 6a, 6b, and 6c all extend in the direction in which the fluid flows through the fluid transfer pipe. In this most basic arrangement, the magnets and the coils themselves have the same width (electrical angle).

[0067] 18(b), compared to the arrangement in Fig. 18(a), only magnets 6a, 6b, and 6c are arranged obliquely to the direction of fluid flow. This arrangement is advantageous in that magnets 6a, 6b, and 6c, which rotate as rotor unit 5 rotates, act as blades or propellers that provide a driving force to the fluid in the direction of flow.

[0068] However, the arrangement of the magnets 6a, 6b, and 6c relative 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 obliquely relative to the direction in which the first axial winding portion 55 and the second axial winding portion 56 of the coil unit 50 extend.

[0069] Therefore, as a fluid transfer device that applies a driving force to the fluid flowing inside the fluid transfer pipe by the rotation of the rotor portion 5, the efficiency is lower than that of the arrangement shown in FIG. 18(a).

[0070] 18(c), compared to the arrangement in Fig. 18(a), the magnets 6a, 6b, and 6c as well as the first axial winding portion 55 and second axial winding portion 56 of the coil unit 50 extend in an arrangement oblique to the fluid flow direction. In this structure, the coil windings constituting the coil are wound obliquely to the fluid flow direction in the same inclined direction as the magnets are inclined to the fluid flow direction.

[0071] As shown in the arrangement in Figure 18(a), the magnet and the coil alone have the same width (electrical angle), ensuring efficiency as a fluid transfer device that applies a propulsive force to the fluid flowing inside the fluid transfer pipe by the rotation of the rotor part 5.

[0072] In addition, the magnets 6a, 6b, and 6c rotate as the rotor section 5 rotates, and are arranged in a manner that is advantageous for them to function as blades or propellers that impart a driving force to the fluid in the flow direction.

[0073] When the fluid transfer device of this embodiment, which is composed of a rotor section 5 having magnets 6 on its peripheral wall and a hollow cylindrical coil 4 extending coaxially relative to the rotor section 5 in the direction in which the fluid flows through the cross-sectionally annular magnetic field formed by the magnets 6, is made of a coreless motor, as described above, by using a hollow cylindrical coil made of wound wire arranged concentrically around the rotation axis, it is possible to easily and accurately prepare a structure in which the coil windings that make up the coil are wound obliquely relative to the direction of fluid flow.

[0074] Generally, since coreless motors do not have an iron core, it is not easy to wind the coil windings that make up the cylindrical coil at an angle to the direction in which the cylindrical coil extends, making manufacturing difficult. In contrast, in this embodiment, by using the hollow cylindrical coil 4 with the structure described using Figures 7 to 11, it is possible to easily and accurately prepare a structure in which the coil windings that make up the coil are wound at an angle to the direction of fluid flow.

[0075] Each magnet 6 can be adhesively fixed to the outer peripheral wall surface of the rotor part 5, but it can also be attached to the rotor part 5 by screwing, etc. In case the centrifugal force caused by the rotation of the rotor part 5 acts to peel the magnet 6 from the outer peripheral wall surface of the rotor part, the attachment by screwing serves as reinforcement.

[0076] (Second embodiment) Another embodiment of the fluid transfer device of the present invention will be described with reference to FIGS.

[0077] The same reference numerals are used for the parts common to the fluid transfer device of the first embodiment described with reference to FIGS. 1 to 4, and the description thereof will be omitted.

[0078] 5 and 6 also apply a driving force in the flow direction to the fluid flowing inside a fluid transfer pipe made of a cylindrical body, and the fluid transfer device 1 shown in Fig. 5 is configured to be installed inside a cylindrical portion 20. Although not shown, the cylindrical portion 20 is configured to be connected to a fluid transfer pipe made of a cylindrical body, inside which the fluid flows, on the left and right sides of the figure.

[0079] The fluid transfer device of this embodiment also includes a magnet body that forms a magnetic field with a circular cross section, and a cylindrical coil that extends in the direction in which the cylindrical body extends within the magnetic field with a circular cross section formed by the magnet body.

[0080] In the illustrated embodiment, a cross-sectionally annular magnetic field is formed between a cylindrical outer yoke 27 that extends in the direction of extension of the cylindrical body that constitutes the fluid transfer device, and a cylindrical inner yoke 28 that is radially inside the outer yoke 27 and extends coaxially with the outer yoke 27 in the direction of extension of the cylindrical body, and within this cross-sectionally annular magnetic field, as shown in Figure 5, a cylindrical coil 4 extends in the direction of extension of the cylindrical body that constitutes the fluid transfer pipe.

[0081] In the illustrated embodiment, a magnet body is disposed on the inner peripheral wall surface of the outer yoke 27 facing the inner yoke 28. As a result, a magnetic field with a circular cross section is formed between the outer yoke 27 and the inner yoke 28 by the magnet body.

[0082] In the illustrated embodiment, a rotation center shaft 24 is disposed radially inside the cylindrical portion 20 and coaxial with the outer yoke 27, the cylindrical coil 4, and the inner yoke 28 so as to be rotatable relative to the cylindrical portion 20.

[0083] The rotation center shaft 24 is rotatably supported at both axial ends via bearings 32a, 32b on the radially inner side of support portions 22, 23 extending radially inward from the inner peripheral wall surface of the cylindrical portion 20.

[0084] The inner yoke 28 is supported by support arms 30 a , 30 b , . . . , 30 e , 30 f extending radially outward from the rotation center shaft 24 , and rotates in the circumferential direction within the cylindrical portion 20 together with the rotation center shaft 24 .

[0085] The outer yoke 27 is supported by the radially outer side of a support arm 29, the radially inner side of which is rotatably supported on the rotation center shaft 24 via a bearing 32c.

[0086] The magnetic body, which is disposed on the inner peripheral wall surface of the outer yoke 27 facing the inner yoke 28 and which forms a magnetic field with a circular cross section 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 in the circumferential direction, as in the first embodiment (FIG. 6). The plurality of magnets 6a to 6h are configured so that south pole magnets and north pole magnets are alternately arranged at predetermined intervals in the circumferential direction.

[0087] The cylindrical coil 4 extends in the direction in which the cylindrical body constituting the fluid transfer pipe extends through the magnetic field having a circular cross section formed between the outer yoke 27 and the inner yoke 28, and is arranged coaxially with the outer yoke 27 and the inner yoke 28, as in the first embodiment. The coil support portion 25 extends radially inward from the inner circumferential wall surface of the cylindrical portion 20, allowing for a configuration in which the cylindrical coil 4 is arranged coaxially with the outer yoke 27 and the inner yoke 28.

[0088] As in the first embodiment, a magnetic field with a circular cross section is formed between the outer yoke 27 and the inner yoke 28, which sandwich the coil 4 radially, and when current is applied to the coil 4, the outer yoke 27 rotates circumferentially around the rotation center axis 24 according to the principle of a motor.

[0089] As a result, the magnets 6a to 6h also rotate in the circumferential direction around the central rotation axis 24, thereby applying a propulsive force in the direction of flow to the fluid, such as liquid or gas, flowing inside the fluid transfer pipe.

[0090] As in the first embodiment, the multiple magnets 6a to 6h that rotate circumferentially around the central axis of rotation 24 as the outer yoke 27 rotates act as blades or propellers that provide a driving force to the fluid to move in the flow direction.

[0091] In the illustrated embodiment, a magnet body is disposed on the inner peripheral wall surface of outer yoke 27, which rotates in the circumferential direction about rotation center axis 24, and a magnetic field having a circular cross section is formed between inner yoke 28, which does not rotate about rotation center axis 24, and outer yoke 27. Alternatively, although not shown, a configuration may be adopted in which the radially inner sides of support arms 30a, ... 30f, which support inner yoke 28 on the radially outer side, are supported via bearings so as to be rotatable in the circumferential direction about rotation center axis 24, and the magnet body that forms the above-mentioned magnetic field having a circular cross section is disposed on the outer peripheral wall surface of inner yoke 28 that faces the inner peripheral wall surface of outer yoke 27.

[0092] In this way, when current is applied to the coil 4, the inner yoke 28 rotates circumferentially around the rotation center axis 24 according to the principle of a motor, and the multiple magnets 6a to 6h constituting the magnetic body arranged on the outer wall surface of the inner yoke 28 rotate circumferentially around the rotation center axis 24, thereby imparting a propulsive force in the flow direction to fluids such as liquids and gases flowing inside the fluid transfer pipe.

[0093] Furthermore, although not shown, a magnetic body may be disposed on both the inner peripheral wall surface of the outer yoke 27 facing the inner yoke 28 and the outer peripheral wall surface of the inner yoke 28 facing the outer yoke 27, thereby forming a magnetic field with a circular cross section between the outer yoke 27 and the inner yoke 28.

[0094] In either embodiment, a magnetic field having a circular cross section is formed between the outer yoke 27 and the inner yoke 28, and by passing current through the cylindrical coil 4 sandwiched between the outer yoke 27 and the inner yoke 28, the magnetic field described above is formed in accordance with the principle of a motor, and the multiple magnets 6 arranged at intervals in the circumferential direction rotate in the circumferential direction around the central rotation axis 24. This imparts a propulsive force in the flow direction to the fluid, such as a liquid or gas, flowing inside the fluid transfer pipe.

[0095] In the case where the outer yoke 27, which has a plurality of magnets 6 arranged on its inner peripheral wall surface, is configured to rotate circumferentially around the rotation center axis 24 according to the motor principle as described above, the inner yoke 28 can also be configured to be supported on the rotation center axis 24 so as to be rotatable circumferentially relative to the rotation center axis 24.

[0096] Similarly, if the inner yoke 28, which has multiple magnets 6 arranged on its outer wall surface, is configured to rotate circumferentially around the rotation center axis 24 using the motor principle as described above, the outer yoke 27 can also be configured to be supported on the rotation center axis 24 so as to be rotatable circumferentially relative to the rotation center axis 24.

[0097] In these cases, a magnetic field with a circular cross section is formed between the outer yoke 27 and the inner yoke 28, forming a magnetic circuit. Therefore, when the outer yoke 27 or the inner yoke 28, on which a plurality of magnets 6 are arranged, rotates in a circumferential direction around the central axis of rotation 24, the other inner yoke 28 or outer yoke 27 also rotates in the same circumferential direction at a slower rotational speed than the outer yoke 27 or the inner yoke 28 on which a plurality of magnets 6 are arranged.

[0098] In this embodiment, as in the first embodiment described above, the magnets 6 extend along the inner peripheral wall of the outer yoke 27 and the outer peripheral wall of the inner yoke 28 at an angle to the direction of fluid flow, and are arranged circumferentially around the outer yoke 27 and the inner yoke 28 with a predetermined distance between them, thereby making it possible to apply the above-mentioned propulsive force more effectively.

[0099] Similarly, the coil windings constituting the coil 4 can also be wound obliquely to the direction in which the fluid flows.

[0100] Furthermore, each magnet 6 can be attached not only by adhesive fixation to the inner peripheral wall of the outer yoke 27 or the outer peripheral wall of the inner yoke 28, but also by screwing, etc. In particular, if the magnet 6 is screwed to the outer peripheral wall of the inner yoke 28, the screwing can reinforce the magnet 6 against a force that tends to peel off the magnet 6 from the outer peripheral wall of the inner yoke 28 due to centrifugal force caused by the rotation of the inner yoke 28.

[0101] Although an embodiment of the present invention has been described above with reference to the accompanying drawings, the present invention is not limited to the above-described embodiment and can be modified in various ways within the technical scope grasped from the description of the claims.

Claims

1. A fluid transfer device that applies a propulsive force in the direction of flow to a fluid flowing inside a fluid transfer pipe made of a cylindrical body, a magnetic body that forms a magnetic field with a circular cross section; and a cylindrical coil that extends in the direction in which the cylindrical body extends through the magnetic field with a circular cross section formed by the magnetic body and is located within the fluid flowing inside the fluid transfer pipe, the magnetic field, which has a circular cross section, is formed between a cylindrical stator portion and a cylindrical rotor portion, which extend in the extension direction of the cylindrical body, sandwiching the coil therebetween in the radial direction, and are arranged coaxially with the coil; the cylindrical rotor portion is supported by a rotation support portion located in the fluid flowing inside the fluid transfer pipe so as to be rotatable in its circumferential direction, the magnet body is composed of a plurality of magnets arranged at predetermined intervals in the circumferential direction on a peripheral wall surface of the rotor section facing the stator section with the coil interposed therebetween, When the coil is energized, the magnets constituting the magnetic body rotate in the circumferential direction, thereby applying the driving force. Fluid transfer device.

2. The plurality of magnets are arranged so as to extend obliquely across the peripheral wall surface of the rotor portion relative to the flow direction. The fluid transfer device of claim 1 .

3. 3. The fluid transfer device according to claim 2, wherein the coil winding constituting the coil is wound obliquely relative to the direction of flow of the fluid in the same inclined direction as the magnet is inclined relative to the direction of flow.

4. 4. The fluid transfer device according to claim 1, wherein each of the plurality of magnets is fixed to a peripheral wall surface of the rotor portion by screws.

5. A fluid transfer device that applies a propulsive force in the direction of flow to a fluid flowing inside a fluid transfer pipe made of a cylindrical body, a magnetic body that forms a magnetic field with a circular cross section; and a cylindrical coil that extends in the direction in which the cylindrical body extends through the magnetic field with a circular cross section formed by the magnetic body and is located within the fluid flowing inside the fluid transfer pipe, the magnetic field having a circular cross section is formed between a cylindrical outer yoke and a cylindrical inner yoke, the outer yoke and inner yoke extending in the extension direction of the cylindrical body and arranged coaxially with the coil, with the coil sandwiched between them in the radial direction; the cylindrical outer yoke and / or the cylindrical inner yoke are supported by a rotation support portion located in the fluid flowing inside the fluid transfer pipe so as to be rotatable in the circumferential direction of each yoke, The magnetic body is an inner peripheral wall surface of the outer yoke that is supported so as to be rotatable in the circumferential direction and faces the outer peripheral wall surface of the inner yoke with the coil therebetween; or an outer peripheral wall surface of the inner yoke that is supported so as to be rotatable in the circumferential direction and faces the inner peripheral wall surface of the outer yoke with the coil therebetween; or The inner peripheral wall surface of the outer yoke is supported so as to be rotatable in the circumferential direction and faces the outer peripheral wall surface of the inner yoke with the coil sandwiched therebetween, and the outer peripheral wall surface of the inner yoke is supported so as to be rotatable in the circumferential direction and faces the inner peripheral wall surface of the outer yoke with the coil sandwiched therebetween. The magnets are arranged at predetermined intervals in the circumferential direction. When the coil is energized, the magnets constituting the magnetic body rotate in the circumferential direction, thereby applying the driving force. Fluid transfer device.

6. The plurality of magnet bodies are arranged so as to extend obliquely along the inner peripheral wall surface of the outer yoke relative to the flow direction, or The plurality of magnet bodies are arranged to extend obliquely along the outer peripheral wall surface of the inner yoke relative to the flow direction, or The plurality of magnet bodies are arranged to extend obliquely along the inner peripheral wall surface of the outer yoke relative to the flow direction, and are also arranged to extend obliquely along the outer peripheral wall surface of the inner yoke relative to the flow direction.

6. The fluid transfer device according to claim 5, wherein

7. 7. A fluid transfer device according to claim 6, wherein the coil winding constituting the coil is wound obliquely relative to the direction of flow of the fluid in the same inclined direction as the magnet is inclined relative to the direction of flow.

8. Each of the plurality of magnet bodies is screwed to the outer yoke, or screwed onto the inner yoke, or Screwed to the outer yoke and screwed to the inner yoke A fluid transfer device according to any one of claims 5 to 7.

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