Pump device

Abstract

In the pump assembly (1), a thrust bearing (13) is disposed at the end of the rotor assembly (51) on one axial side (L1), opposite to the second radial bearing (12). The rotor assembly (51) is provided with a through portion (7) extending axially between the magnet (52) and the rotating shaft (10). The through portion (7) communicates with the pump chamber (30) via a side opening (73) that opens at the end face of the rotor assembly (51) on one axial side (L1). The side opening (73) includes: an inner peripheral portion (73A) of the opening that is blocked by the thrust bearing (13); and an outer peripheral portion (73B) of the opening that opens at a position closer to the outer peripheral side than the outer peripheral edge of the thrust bearing (13).

Description

Technical Field

[0001] This invention relates to a pump device. Background Technology

[0002] Patent documents 1 and 2 describe a pump device that uses a motor to rotate an impeller disposed in a pump chamber. In the pump device of patent documents 1 and 2, a support shaft is fixed on the housing forming the pump chamber, and a rotor that rotates integrally with the impeller is rotatably supported on the support shaft via a bearing component disposed at the radial center.

[0003] In the pump assembly of Patent Documents 1 and 2, the rotor has a cylindrical portion (rotor hub in Patent Document 2) with a bearing component arranged at its radial center. One end of the cylindrical portion extends into the pump chamber and is connected to the impeller. A magnet is fixed to the outer circumferential surface of the portion of the cylindrical portion opposite to the impeller, and the cylindrical portion is housed in a recess provided in the housing.

[0004] The fluid flowing into the pump chamber also flows through the gap between the recess in the housing and the magnet. In Patent Documents 1 and 2, the rotor has through-sections formed by axially extending grooves in the gaps between the cylindrical section and the bearing components, and in the gaps between the bearing components and the support shaft. When fluid flows into the pump chamber, these through-sections form flow paths for the fluid, thereby cooling the high-temperature areas that become due to sliding contact during rotor rotation. Furthermore, air surrounding the sliding contact areas can escape to the pump chamber side through these through-sections. This prevents sliding contact from occurring in a dry state without liquid diffusion.

[0005] Existing technical documents

[0006] Patent documents

[0007] Patent Document 1: Japanese Patent Application Publication No. 2022-183753

[0008] Patent Document 2: Japanese Patent No. 7126467 Summary of the Invention

[0009] In the pump device of Patent Documents 1 and 2, as described above, the support shaft located at the radial center of the rotor is a fixed shaft fixed to the housing, and the bearing assembly rotates integrally with the rotor. A washer serving as a thrust bearing is provided at the fitting portion at the end of the support shaft, and the end face of the bearing assembly slides in contact with the washer during rotation.

[0010] In contrast, in pump devices with a rotating shaft that rotates integrally with the rotor, the bearing assembly is fixed to the housing and supports both ends of the rotating shaft. Washers serving as thrust bearings are disposed on the end face of the rotor assembly that holds the rotating shaft.

[0011] In pump devices with a rotating shaft, similar to pump devices with a fixed shaft, in order to prevent the rotating shaft from sliding contacting the bearing components in a dry state, it is preferable to provide a through portion that extends axially through the rotor components so that air around the bearing components can escape.

[0012] However, if the through-hole of the rotor assembly is open on the end face opposite to the bearing assembly, components such as washers configured as thrust bearings will overlap with the through-hole. If the thrust bearing completely blocks the through-hole, air cannot escape.

[0013] In view of the above problems, the object of the present invention is to prevent the exhaust passage in a pump device with a rotating shaft from being blocked by the thrust bearing.

[0014] To address the aforementioned problems, one aspect of the pump device of the present invention includes: a rotor having a rotating shaft, a rotor assembly, and a magnet, the rotating shaft being fixed to the radial center of the rotor assembly, and the magnet being disposed on the outer peripheral surface of the rotor assembly; an impeller disposed relative to the magnet on one side of the rotor's rotation axis along the axial direction and rotating integrally with the rotating shaft; a first housing having a concave partition wall recessed toward the other side of the axial direction, a first radial bearing for supporting the rotating shaft to rotate being disposed at the bottom of the partition wall; and a second housing covering the first housing from one side of the axial direction, housing the rotor assembly and the magnet between the second and the partition wall, and disposed thereon. The rotating shaft is supported by a second radial bearing capable of rotation; and a third housing covers the second housing from one side of the axial direction, forming a pump chamber for receiving the impeller between the third and third housings. A thrust bearing opposite to the second radial bearing is disposed at the end of the rotor component on one side of the axial direction. The rotor component has a through portion extending axially between the magnet and the rotating shaft. The through portion communicates with the pump chamber via a side opening that opens on one side of the end face of the rotor component on one side of the axial direction. The side opening includes: an inner periphery of the opening blocked by the thrust bearing; and an outer periphery of the opening that opens at a position closer to the outer periphery of the thrust bearing. Attached Figure Description

[0015] Figure 1 This is a cross-sectional view and a partially enlarged view of the pump device according to an embodiment of the present invention.

[0016] Figure 2 Viewed from one side of the axis Figure 1 An exploded perspective view of the pump assembly, including the impeller, the second housing with the second radial bearing, the rotor assembly with the rotating shaft, and the magnet.

[0017] Figure 3 Viewed from the other side of the axis Figure 1An exploded perspective view of the pump assembly, including the impeller, second housing, second radial bearing, rotor assembly with a fixed rotating shaft, and magnet.

[0018] Figure 4 It is an exploded perspective view of the thrust bearing and rotor components.

[0019] Figure 5 It is a three-dimensional view of a rotor assembly with a thrust bearing.

[0020] Figure 6 It is a sectional perspective view of a rotor assembly with a thrust bearing. Detailed Implementation

[0021] The implementation of pump device 1 will now be described with reference to the accompanying drawings.

[0022] (Overall structure)

[0023] Figure 1 This is a cross-sectional view and a partially enlarged view of the pump device 1 according to an embodiment of the present invention. For example... Figure 1 As shown, the pump assembly 1 includes: a motor 2; an impeller 3 driven to rotate by the motor 2; and a housing 4 housing the motor 2 and the impeller 3. The motor 2 includes a rotor 5 and a stator 6 surrounding the outer periphery of the rotor 5. The impeller 3 rotates integrally with the rotor 5. In this embodiment, the rotor 5 includes a rotating shaft 10 rotatably supported by the housing 4, and the impeller 3 is connected to the rotating shaft 10.

[0024] In the following description, the direction along the rotation axis L of the rotor 5 will be referred to as the axial direction, one side of the axial direction will be referred to as L1, and the other side of the axial direction will be referred to as L2. The rotor 5 includes a rotor component 51 extending axially and a magnet 52 disposed on the outer peripheral surface of the rotor component 51. A rotating shaft 10 is disposed at the radial center of the rotor component 51 and protrudes from the rotor component 51 toward one axial side L1 and the other axial side L2. In this embodiment, the rotating shaft 10 is fixed to the rotor component 51 by insert molding. An impeller 3 is disposed on one axial side L1 of the rotor component 51 and the magnet 52 and fixed to the end of the rotating shaft 10 on one axial side L1.

[0025] The stator 6 includes: an annular stator core 61 surrounding the outer periphery of the rotor component 51 and the magnet 52; and a coil 63 wound around the salient pole of the stator core 61 with an insulator 62 in between. A circuit board 64 for providing drive current to the coil 63 is disposed on the other axial side L2 of the stator 6.

[0026] The housing 4 includes: a first housing 41 having a concave partition wall 40 recessed towards the other axial side L2; a second housing 42 covering the first housing 41 from one axial side L1; and a third housing 43 covering the second housing 42 from one axial side L1. A pump chamber 30, equipped with an impeller 3, is formed by the second housing 42 and the third housing 43. A suction pipe 44 is provided at the radial center of the third housing 43, extending towards one axial side L1 of the pump chamber 30. The third housing 43 is provided with a discharge pipe (not shown) extending tangentially along the outer peripheral surface of the pump chamber 30.

[0027] The housing 4 is fastened with bolts at the axially abutting position where the outer peripheral end of the first housing 41 and the outer peripheral end of the third housing 43 meet. Thus, the third housing 43 is fixed to the first housing 41. The outer peripheral end of the second housing 42 is sandwiched between the first housing 41 and the third housing 43. Thus, the second housing 42 is fixed to both the first housing 41 and the third housing 43.

[0028] The first housing 41 includes: an annular plate portion 45 extending radially outward from one axial side L1 of the partition wall portion 40; and a cylindrical main body portion 46 extending radially outward from the outer periphery of the annular plate portion 45 to the other axial side L2 and surrounding the outer periphery of the stator 6. The second housing 42 abuts against the annular plate portion 45 from one axial side L1. The rotor component 51 and the magnet 52 are disposed on the inner periphery of the partition wall portion 40 and are housed between the second housing 42 and the partition wall portion 40. The space between the partition wall portion 40 and the second housing 42 communicates with the pump chamber 30 via a hole 47 penetrating the second housing 42.

[0029] The rotating shaft 10 of the rotor 5 is supported by a first radial bearing 11 disposed at the bottom center of the partition wall portion 40 and a second radial bearing 12 disposed at the radial center of the second housing 42, enabling it to rotate. The rotating shaft 10 extends through the second radial bearing 12 to one axial side L1 of the second housing 42 and is connected to the impeller 3 disposed in the pump chamber 30.

[0030] like Figure 1 As shown, a thrust bearing 13 is disposed opposite to the second radial bearing 12 at the end of the rotor component 51 on the axial side L1. The thrust bearing 13 is mounted on the end of the rotating shaft 10 and fixed to the end face of the rotor component 51 on the axial side L1. In this embodiment, the thrust bearing 13 is a washer. When the rotor 5 rotates, the rotor 5 is pushed axially towards the axial side L1 by the thrust acting on the impeller 3, causing the thrust bearing 13 to slide in contact with the second radial bearing 12.

[0031] Figure 2 Viewed from the axial side L1 Figure 1An exploded perspective view of the impeller 3, the second housing 42 with the second radial bearing 12 fixed, the rotor component 51 with the rotating shaft 10 fixed, and the magnet 52 of the pump device 1. Figure 3 Viewed from the other side of the axis Figure 1 An exploded perspective view of the pump assembly, including the impeller 3, the second housing 42, the second radial bearing 12, the rotor assembly 51 with the rotating shaft 10 fixed thereon, and the magnet 52.

[0032] like Figure 1 , Figure 2 , Figure 3 As shown, the impeller 3 includes: a disc component 31 fixed to the front end of the rotating shaft 10; and an impeller component 32 fixed to the disc component 31 from one axial side L1. The second housing 42 has a cylindrical bearing retaining portion 48 at its radial center for mounting a second radial bearing 12. A fitting cylindrical portion 49, fitted within a partition wall portion 40 of the first housing 41, is provided on the outer periphery of the bearing retaining portion 48. Multiple holes 47 are provided between the bearing retaining portion 48 and the fitting cylindrical portion 49, and on the outer periphery of the fitting cylindrical portion 49, penetrating the second housing 42 axially.

[0033] The rotor component 51 includes: a cylindrical portion 53 extending axially; and a seat portion 54 extending radially outward from an end L1 on one axial side of the cylindrical portion 53. The cylindrical portion 53 is fitted inside the cylindrical magnet 52 to hold the magnet 52. Figure 1 As shown, the seat 54 abuts against the magnet 52 from one axial side L1 and supports the magnet 52 from one axial side L1. Figure 3 As shown, the seat portion 54 has an anti-rotation protrusion 56, which engages with an anti-rotation recess 55 formed on the end face of the axial side L1 of the magnet 52.

[0034] (The shape of the opening in the through section of the rotor component)

[0035] Figure 4 This is an exploded perspective view of the thrust bearing 13 and the rotor assembly 51. Figure 5 This is a perspective view of the rotor assembly 51 with the thrust bearing 13 assembled. Figure 6 This is a sectional perspective view of the rotor assembly 51 with the thrust bearing 13 assembled. (See image below.) Figure 4 , Figure 6 As shown, the rotor component 51 is provided with a through portion 7 that extends through the cylindrical portion 53 along the axial direction. The through portion 7 has: a straight portion 71 that extends in a straight line along the axial direction; and a recess 72 that is recessed radially outward from the inner circumferential surface of the end of the straight portion 71 on the axial side L1.

[0036] The rotor component 51 is provided with multiple through portions 7. For example... Figure 4As shown, the multiple through portions 7 have the same shape. In this embodiment, there are four through portions 7, which are arranged at equal intervals along the circumference. Among the four through portions, the straight portions 71 are arc-shaped holes extending circumferentially around the axis of rotation L when viewed from the axial direction. The circumferential width of the recess 72 is narrower than the circumferential width of the straight portions 71, and it is recessed radially outward from the circumferential center of the straight portions 71.

[0037] The through portion 7 has a side opening 73 that opens at the end face of the axial side L1 of the rotor component 51. As described above, a recess 72 is provided at the end of the axial side L1 of the through portion 7, so the side opening 73 is an opening that connects the straight portion 71 and the recess 72.

[0038] like Figure 1 Enlarged view of the part and Figure 4 , Figure 6 As shown, a circular protrusion 57 protruding towards the axial side L1 is provided at the center of the end face of the rotor component 51 on one side L1. The opening 73 on one side of the through portion 7 opens at the front end face of the circular protrusion 57.

[0039] like Figure 1 Enlarged view of the part and Figure 6 As shown, the outer diameter of the circular protrusion 57 is larger than the outer diameter of the cylindrical portion 53 of the rotor component 51, and the outer peripheral end of the circular protrusion 57 extends to the inner peripheral portion of the seat portion 54. The recess 72 is recessed from the straight portion 71 to near the outer peripheral edge of the circular protrusion 57, and extends to a position closer to the outer peripheral side than the outer peripheral surface of the cylindrical portion 53. Figure 1 As shown in the enlarged view, the axial depth D of the recess 72 is less than the axial thickness t of the inner periphery of the seat 54, which has a circular protrusion 57. Therefore, the recess 72 does not penetrate the seat 54 in the axial direction.

[0040] like Figure 4 As shown, the thrust bearing 13 is a disc-shaped washer with multiple notches 14 cut off in an arc shape at various points in the circumferential direction. Figure 5 , Figure 6 As shown, a plurality of protrusions 58 provided near the outer periphery of the front end face of the circular protrusion 57 are respectively embedded in the notch 14 of the thrust bearing 13. Thus, when the thrust bearing 13 is mounted on the end face of the axial side L1 of the rotor component 51, it is possible to prevent the thrust bearing 13 from rotating relative to the rotor component 51.

[0041] like Figure 5 , Figure 6As shown, the thrust bearing 13 overlaps entirely with the straight portion 71 of the through portion 7 from the axial side L1, and blocks the straight portion 71 from the axial side L1. On the other hand, except for the inner peripheral end connected to the straight portion 71, most of the recess 72 of the through portion 7 is located on the outer peripheral side of the thrust bearing 13, maintaining a state where it is not blocked by the thrust bearing 13. Therefore, the opening 73 on one side of the through portion 7 includes: an inner peripheral portion 73A of the opening blocked by the thrust bearing 13; and an outer peripheral portion 73B of the opening not blocked by the thrust bearing 13.

[0042] At the end of the rotor assembly 51 on the pump chamber 30 side, when fluid flows through the through section 7, the fluid... Figure 1 The flow is as indicated by the arrow in the enlarged partial view. That is, since the inner periphery 73A of the opening 73 on one side of the through section 7 is blocked by the thrust bearing 13, a flow occurs from the straight section 71 through the recess 72 toward the radially outward side. Then, the fluid is discharged from the outer periphery 73B of the opening to the radially outward side of the second radial bearing 12.

[0043] like Figure 1 , Figure 3 As shown, a second thrust bearing 15 is disposed at the end of the rotor component 51 on the other axial side L2, opposite to the first radial bearing 11. The second thrust bearing 15 is mounted on the end of the rotating shaft 10 and disposed in a recess provided on the end face of the rotor component 51 on the other axial side L2. In this embodiment, the second thrust bearing 15 is a washer with the same shape as the thrust bearing 13 described above.

[0044] like Figure 1 , Figure 6 As shown, the through portion 7 has a groove 74 extending radially outward from the end of the straight portion 71 on the other side L2 axially. The groove 74 extends to a position radially outward beyond the outer periphery of the second thrust bearing 15 and opens into the outer peripheral surface of the cylindrical portion 53 of the rotor component 51. Therefore, at the end of the through portion 7 on the other side L2 axially, the straight portion 71 is blocked by the second thrust bearing 15, but a portion of the groove 74 is not blocked.

[0045] like Figure 1 As shown, the gap S between the bottom of the partition wall 40 and the end of the rotor component 51 on the other axial side L2 is connected to the through portion 7 via the slot 74. Therefore, when fluid in the pump chamber 30 flows into the bottom of the partition wall 40 through the gap between the partition wall 40 and the outer peripheral surface of the magnet 52, the air in the gap S is discharged from the through portion 7 to the axial side L1 of the rotor component 51 via the slot 74.

[0046] (Effects)

[0047] As described above, the pump device 1 of this embodiment includes: a rotor 5, which includes a rotating shaft 10, a rotor component 51, and a magnet 52, the rotating shaft 10 being fixed at the radial center of the rotor component 51, and the magnet 52 being disposed on the outer peripheral surface of the rotor component 51; an impeller 3, which is disposed on one side L1 of the axial direction along the rotation axis L of the rotor 5 relative to the magnet 52, and rotates integrally with the rotating shaft 10; a first housing 41, which has a concave partition wall portion 40 recessed towards the other side L2 of the axial direction, and a first radial bearing 11 supporting the rotating shaft 10 to be rotatable is disposed at the bottom of the partition wall portion 40; a second housing 42, which covers the first housing 41 from one side L1 of the axial direction, and houses the rotor component 51 and the magnet 52 between the second housing 42 and the partition wall portion 40, and is provided for the second radial bearing 12 supporting the rotating shaft 10 to be rotatable; and a third housing 43, which covers the second housing 42 from one side L1 of the axial direction, and forms a pump chamber 30 for housing the impeller 3 between the third housing and the second housing 43. At the end of the rotor component 51 on one axial side L1, a thrust bearing 13 is disposed opposite to the second radial bearing 12. The rotor component 51 is provided with a through portion 7 extending axially between the magnet 52 and the rotating shaft 10. The through portion 7 communicates with the pump chamber 30 via a side opening 73 that opens at the end face of the rotor component 51 on one axial side L1. The side opening 73 includes: an inner peripheral portion 73A of the opening that is blocked by the thrust bearing 13; and an outer peripheral portion 73B of the opening that opens at a position closer to the outer peripheral edge of the thrust bearing 13.

[0048] Thus, in this embodiment, the inner circumference of the opening (one-sided opening 73) at the end of the through-part 7 that penetrates the rotor component 51 axially on the pump chamber 30 side is blocked by the thrust bearing 13, while the outer circumference remains open. Therefore, it is possible to prevent the thrust bearing 13 from completely blocking the through-part 7. In addition, in this embodiment, when the inner circumference of the opening is blocked, the fluid blocked by the thrust bearing 13 in the through-part 7 will flow to the outer circumference side. Therefore, the fluid discharged from the through-part 7 to the area around the second radial bearing 12 can easily flow to the outer circumference side. Therefore, when air or foreign matter generated due to sliding contact around the first radial bearing 11 at the bottom of the partition wall 40 is discharged to the pump chamber 30 side through the through-part 7, the flow of air and foreign matter to the second radial bearing 12 side can be suppressed.

[0049] In this embodiment, the through portion 7 has a straight portion 71 extending axially and a recess 72 that is recessed radially outward from the inner surface of the end of the straight portion 71 on one axial side L1. The outer peripheral portion 73B of the opening is formed by the recess 72. In this way, by providing the recess 72 at the end of the through portion 7, a flow path shape that facilitates fluid flow to the outer peripheral side can be formed.

[0050] In this embodiment, the thrust bearing 13 covers the entire straight portion 71 and the inner peripheral end of the recess 72, but the position of the outer peripheral edge of the thrust bearing 13 may differ from that in this embodiment. That is, the position of the outer peripheral edge of the thrust bearing 13 may be the same as that of the outer peripheral edge of the straight portion 71. Alternatively, the outer peripheral edge of the thrust bearing 13 may be located further inward than the outer peripheral edge of the straight portion 71. In this case, the outer peripheral portion 73B of the opening is formed by the outer peripheral portion of the straight portion 71 and the entire recess 72.

[0051] In this embodiment, the rotor component 51 includes: a cylindrical portion 53 that fits into the inner circumferential side of the magnet 52; and a seat portion 54 that protrudes radially outward from one axial end of the cylindrical portion 53 and supports the magnet 52 from one axial side L1, with a straight portion 71 extending through the cylindrical portion 53 and a recess 72 extending to the seat portion 54. In this way, even if the outer diameter of the cylindrical portion 53 is small, the outer circumferential portion 73B of the opening can be positioned on the outer circumferential side.

[0052] In this embodiment, the thrust bearing 13 has a plurality of notches 14 on its outer periphery, and the end face of the rotor component 51 on the other axial side L2 has protrusions 58 that respectively engage with the plurality of notches 14. In this way, the thrust bearing 13 can be prevented from rotating relative to the rotor component 51.

[0053] In this embodiment, the rotor component 51 is provided with a plurality of through portions 7, which are uniformly arranged circumferentially around the rotation shaft 10. In this way, air around the first radial bearing 11 and foreign matter generated due to sliding contact can be discharged evenly.

[0054] In this embodiment, a second thrust bearing 15, opposite to the first radial bearing 11, is disposed at the end of the rotor component 51 on the other axial side L2. The through portion 7 has a groove 74 extending radially outward from the end of the straight portion 71 on the other axial side L2, extending to a position radially outward beyond the outer periphery of the second thrust bearing 15. In this way, even with the second thrust bearing 15 installed, air and foreign matter surrounding the first radial bearing 11 disposed at the bottom of the partition wall portion 40 can be discharged.

[0055] (Summary)

[0056] The present invention can be implemented in the following ways.

[0057] (1) A pump device, comprising: A rotor having a rotating shaft, a rotor component with the rotating shaft fixed at its radial center, and a magnet disposed on the outer peripheral surface of the rotor component; An impeller is disposed on one side of the rotor's axis of rotation relative to the magnet and rotates integrally with the axis of rotation; The first housing has a recessed partition wall portion recessed to the other side of the axial direction, and a first radial bearing for supporting the rotating shaft to be rotatable is disposed at the bottom of the partition wall. A second housing, which covers the first housing from one axial side, houses the rotor component and the magnet between itself and the partition wall, and is provided with a second radial bearing that supports the rotating shaft for rotatability; and A third housing covers the second housing from one axial side, forming a pump chamber for housing the impeller between the third and second housings. At the end of the rotor component on the axial side, a thrust bearing is disposed opposite to the second radial bearing. The rotor component has a through portion extending axially between the magnet and the rotating shaft, the through portion communicating with the pump chamber via a side opening on one end face of the rotor component on the axial side. The opening on one side includes: an inner peripheral portion of the opening blocked by the thrust bearing; and an outer peripheral portion of the opening that opens at a position closer to the outer peripheral edge of the thrust bearing.

[0058] (2) The pump device according to (1) above, wherein, The through portion includes: a straight portion extending along the axial direction; and a recess extending radially outward from the inner circumferential surface of the end of the straight portion on one side of the axial direction. At least a portion of the outer periphery of the opening is formed by the recess.

[0059] (3) The pump device according to (2) above, wherein, The rotor component includes: a cylindrical portion fitted into the inner circumference of the magnet; and a seat portion protruding radially outward from an end of the cylindrical portion on the axial side to support the magnet from the axial side. The straight section extends through the cylindrical section. The recess extends into the seat portion.

[0060] (4) The pump device according to any one of (1) to (3) above, wherein, The thrust bearing has multiple notches on its outer periphery. The rotor component has a protrusion on the other side of the axial direction for engaging with the plurality of notches.

[0061] (5) The pump device according to any one of (1) to (4) above, wherein, The rotor component is provided with a plurality of through portions, which are evenly arranged circumferentially around the rotation axis.

[0062] (6) The pump device according to (2) or (3) above, wherein, At the end of the rotor component on the other side of the axial direction, a second thrust bearing is disposed opposite to the first radial bearing. The through portion includes a groove extending radially outward from the end of the straight portion on the other side of the axial direction. The groove extends to a position further outward than the outer periphery of the second thrust bearing.

[0063] Symbol Explanation

[0064] 1...Pump assembly, 2...Motor, 3...Impeller, 4...Housing, 5...Rotor, 6...Stator, 7...Through section, 10...Rotating shaft, 11...First radial bearing, 12...Second radial bearing, 13...Thrust bearing, 14...Notch, 15...Second thrust bearing, 30...Pump chamber, 31...Disc assembly, 32...Impeller assembly, 40...Partition wall, 41...First housing, 42...Second housing, 43...Third housing, 44...Suction pipe, 45...Annular plate, 46...Main body, 47...Hole, 48...Bearing retainer, 49...Matching cylinder, 51...Rotor assembly, 52...Magnet, 53...Cylinder, 54...Seat, 55...Anti-rotation recess, 56...Anti-rotation protrusion 57... Circular convex part, 58... convex part, 61... stator core, 62... insulator, 63... coil, 64... circuit board, 71... straight part, 72... recessed part, 73... opening on one side, 73B... outer periphery of opening, 73A... inner periphery of opening, 74... slot, L... axis of rotation, L1... axial side, L2... axial side, S... gap.

Claims

1. A pump device, characterized in that, include: A rotor having a rotating shaft, rotor components, and magnets, the rotating shaft being fixed to the radial center of the rotor components, and the magnets being disposed on the outer peripheral surface of the rotor components; An impeller is disposed on one side of the rotor along the axis of rotation relative to the magnet and rotates integrally with the axis of rotation; A first housing having a recessed partition wall recessed to the opposite side of the axial direction, wherein a first radial bearing is disposed at the bottom of the partition wall to support the rotating shaft so that it can rotate; A second housing covers the first housing from one side of the axial direction, houses the rotor component and the magnet between the second housing and the partition wall, and is provided with a second radial bearing that supports the rotating shaft to be rotatable. as well as A third housing covers the second housing from one side of the axial direction, forming a pump chamber for housing the impeller between the third and second housings. At one end of the rotor assembly on one side of the axial direction, a thrust bearing is disposed opposite to the second radial bearing. The rotor assembly has a through portion extending axially between the magnet and the rotating shaft, the through portion communicating with the pump chamber via a side opening on one end face of the rotor assembly along the axial direction. The opening on one side includes: the inner periphery of the opening that is blocked by the thrust bearing; And an outer peripheral portion of the opening that opens at a position closer to the outer periphery than the outer periphery of the thrust bearing.

2. The pump device according to claim 1, characterized in that, The through portion includes: a straight portion extending along the axial direction; and a recess extending radially outward from the inner circumferential surface of one end of the straight portion along the axial direction. At least a portion of the outer periphery of the opening is formed by the recess.

3. The pump device according to claim 2, characterized in that, The rotor component includes: a cylindrical portion that fits into the inner circumferential side of the magnet; and a seat portion that protrudes radially outward from one end of the cylindrical portion along the axial direction to support the magnet from that side. The straight section extends through the cylindrical section. The recess extends into the seat.

4. The pump device according to claim 1, characterized in that, The thrust bearing has multiple notches on its outer periphery. On the end face of the rotor component on the other side of the axial direction, there are protrusions that respectively engage with the plurality of notches.

5. The pump device according to claim 1, characterized in that, The rotor component is provided with a plurality of through portions, which are evenly arranged circumferentially around the rotation axis.

6. The pump device according to claim 2, characterized in that, At the end of the rotor assembly on the other side of the axial direction, a second thrust bearing is disposed opposite to the first radial bearing. The through portion includes a groove extending radially outward from the end of the straight portion on the other side of the axial direction. The groove extends to a position further outward than the outer periphery of the second thrust bearing.

Images