Pump device

Abstract

Pumping device 100 comprising a motor 10 with a rotor 4, a stator 3 surrounding the outer circumference of the rotor 4, and a resin coating 6 covering the stator 3; an impeller 8 arranged in the first direction of the rotor 4 and rotating integrally with the rotor 4; a resin housing 2 covering the impeller 8 from the first direction of the coating 6 and inserted into the mounting opening of a mounting element from the second direction; an annular first sealing element 11 arranged in contact with the outer surface of the housing 2 and deforming elastically in a radial direction perpendicular to the axis of rotation between the housing 2 and the inner surface of the mounting opening;a first regulating section 5, which, situated in the first direction of the first sealing element 11, regulates the movement of the first sealing element 11 in that direction, and a second regulating section 9, which is provided separately from the first regulating section 5 and, situated in the second direction of the first sealing element 11, regulates the movement of the first sealing element 11 in the second direction.

Description

Technical field

[0001] The present invention relates to a pumping device. State of the art

[0002] A pumping device for circulating liquid is described in JP A 2021-120568. The pumping device in this document comprises a motor housing and a pump housing located at one axial end of the motor housing. The motor housing contains a motor unit that serves as the drive source for an electric pump. A pump rotor connected to a rotating shaft of the motor unit is housed within the pump housing. The pumping device is used with the motor housing inserted into a pump mounting opening. Brief description of the invention

[0003] In the pump device described in JP A 2021-120568, a sealing element, such as an O-ring, is provided between the motor housing and the pump mounting opening to prevent fluid from escaping the pump mounting opening. The sealing element deforms elastically and radially between the motor housing and the pump mounting opening. The sealing element is positioned in a groove on the outer surface of the motor housing. The axial movement of the sealing element is regulated by the axial inner wall of the groove.

[0004] If the motor housing is made of resin, a parting line forms within the groove when the resin is cast. This creates a step within the groove. If the sealing element is tightly seated on the inside of the groove, a gap can therefore form between the outer surface of the motor housing and the sealing element. This reduces the adhesion between the motor housing and the pump mounting port, increasing the likelihood of fluid leakage from the pump mounting port.

[0005] In view of the problems mentioned above, one object of the present invention is to provide a pumping device which is used while inserted into a mounting opening of a mounting element, in which movement in the axial direction is restricted and a reduction of the adhesion of a sealing element arranged on the outer surface of the resin housing is suppressed.

[0006] To solve the problems mentioned above, one embodiment of the pumping device of the present invention is characterized in that it has the following features: a motor consisting of a rotor, a stator surrounding the outer circumference of the rotor, and a resin coating covering the stator; an impeller arranged in the first direction of the rotor and rotating integrally with the rotor, the first direction running along the axis of rotation of the rotor and the second direction opposite to the first direction, a resin housing that covers the impeller from the first direction and is inserted from the second direction into a mounting opening provided in the mounting element, a first ring-shaped sealing element that is arranged in contact with the outer surface of the housing and deforms elastically in a radial direction perpendicular to the axis of rotation between the housing and the inner surface of the mounting opening, a first regulating section, which is arranged in the first direction of the first sealing element, to regulate the movement of the first sealing element in the first direction, and a second regulating section, which is arranged in the second direction of the first sealing element and is provided separately from the first regulating section, in order to regulate the movement of the first sealing element in the second direction. Brief description of the drawings

[0007] Embodiments are now described only by way of example with reference to the accompanying drawings, which are to be understood as exemplary and not limiting, and in which identical elements in several drawings are provided with the same reference numerals, wherein: Fig. Figure 1 shows a cross-sectional view of the pump device of this embodiment; Fig. 2 shows a perspective view of the pumping device of this embodiment from the first direction; Fig. 3 shows a perspective view of the pumping device of this embodiment from the second direction; Fig. 4 shows a perspective exploded view of the motor, the first sealing element and the housing; Fig. 5 shows a perspective view of the casing from the second direction; Fig. Figure 6 schematically shows the relationship between the first sealing element and the first and second regulating sections; and Fig. Figure 7 schematically shows the second projection in another embodiment. Description of the embodiments (overall structure)

[0008] Fig. Figure 1 shows a cross-sectional view of the pump device 100 according to the present embodiment. Fig. Figure 2 shows a perspective view of the pump device 100 according to the present embodiment from the first direction. Fig. Figure 3 shows a perspective view of the pump device 100 according to the present embodiment from the second direction. Fig. Figure 4 shows a perspective exploded view of the motor 10, the first sealing element 11 and the housing 2. Fig. Figure 5 shows a perspective view of housing 2 from the second direction. Fig. Figure 6 shows the relationship between the first sealing element 11, the first regulating section 5 and the second regulating section 9. In the drawings, L1 denotes the first direction along the axis of rotation L and L2 the second direction opposite to the first direction L1.

[0009] As in Fig. As shown in Figure 1, the pump device 100 of this embodiment is used in a state in which it is inserted into a mounting opening 510 of a mounting element 500. For example, the pump device 100 is used as a vehicle pump, where the ambient temperature and the fluid temperature are subject to fluctuations, and is attached to the mounting element 500, which is mounted on the main body of a vehicle or the like. The pump device 100 is attached to a mounting element 500, which also serves as a cover element. The pump device 100 has a dual structure in which the housing 2 is covered by a cover element and attached to a counterpart, such as a vehicle, via the cover element. When the pump device 100 is attached to a counterpart, such as a vehicle, using a cover element, the shape of the cover element can be modified to adapt to different shapes of the counterpart.

[0010] As in Fig. 1, Fig. 2, Fig. 3 to Fig. As shown in Figure 4, the pumping device 100 comprises a motor 10, an impeller 8 arranged in the first direction L1 of the motor 10, a housing 2 arranged in the first direction L1 of the motor 10 and defining a pumping chamber 20, a first sealing element 11 positioned between the housing 2 and the mounting opening 510, a first regulating section 5 arranged in the first direction L1 of the first sealing element 11, and a second regulating section 9 arranged in the second direction L2 of the first sealing element 11. The second regulating section 9 is provided separately from the first regulating section 5.

[0011] The motor 10 comprises a cylindrical stator 3, a rotor 4 arranged in the stator 3, a resin coating 6 surrounding the stator 3, and a round, rod-shaped support shaft 16 that rotatably supports the rotor 4. The support shaft 16 is made of metal or ceramic.

[0012] As in Fig. As shown in Figure 1, the stator 3 comprises a stator core 31, an insulator 32 held by the stator core 31 and a coil 35 wound around the stator core 31 via the insulator 32.

[0013] Rotor 4 rotates around a rotational axis L. As in Fig. As shown in Figure 1, the rotor 4 comprises a radial bearing 13 through which a support shaft 16 is inserted on its inner circumference, a tubular cylinder section 40 which holds the radial bearing 13 on its inner side, and a magnet 15 which is attached to the outer side of the cylinder section 40. The cylinder section 40 is a resin molded part into which the radial bearing 13 is cast. The cylinder section 40 opens towards the pump chamber 20. The impeller 8 is connected to the end of the cylinder section 40 in the first direction L1. The magnet 15 is a rare-earth magnet.

[0014] The casing 6 consists of a resin sealing element that covers the stator 3 on both radial sides and on both sides along the axis of rotation L. The resin sealing element is a resin section that is formed when the stator 3 is overmolded using polyphenylene sulfide (PPS) or the like.

[0015] As in Fig. 1, Fig. 2 to Fig. As shown in Figure 3, the casing 6 comprises a central section 61, which radially covers the stator 3 from the outside, and a tube section 62, which is provided at the end of the central section 61 in the second direction L2. A printed circuit board 19 is mounted inside the tube section 62 and is equipped with a circuit for controlling the power supply to the coil 35, etc. A cover 18 is attached to the end of the tube section 62 in the second direction L2.

[0016] The central section 61 has a second projection 63 and a flange 64. The second projection 63 and the flange 64 extend annularly from the outer surface of the central section 61. The second projection 63 is located further in the first direction L1 than the center of the central section 61 and near the end of the central section 61 in the first direction L1. The flange 64 is located further in the second direction L2 than the second projection 63. The outer diameter of the flange 64 is larger than the outer diameter of the second projection 63. When the housing 2 is inserted into the mounting opening 510, the flange 64 contacts the mounting surface 530 of the mounting element 500 to position the pump device 100 in the first direction L1 relative to the mounting element 500. In this embodiment, the second regulating section 9 is the second projection 63.The second projection 63 is arranged in the second direction L2 of the first sealing element 11 in order to regulate the movement of the first sealing element 11 in the second direction L2.

[0017] Housing 2 is made of resin. As in Fig. As shown in Figure 1, when mounting the pump device 100 to the mounting element 500, the housing 2 is inserted from the second direction L2 into a mounting opening 510 produced in the mounting element 500. As shown in Figure 1. Fig. 1, Fig. 2, Fig. 3, Fig. 4 to Fig. As shown in Figure 5, the housing 2 comprises a first side wall section 23, which radially surrounds the impeller 8 from the outside; an annular connecting plate section 24, which projects radially outwards from one end of the first side wall section 23 in the second direction L2 and faces a first end face 65 of the casing 6, which points in the first direction L1; and a second side wall section 25, which projects from the outer edge of the connecting plate section 24 in the second direction L2, surrounds the casing 6, and on whose outer surface the first sealing element 11 is attached. The second side wall section 25 is annular and centered on the axis of rotation L.

[0018] The housing 2 has a first projection 29 that extends radially outwards in an annular shape from the outer surface of the second side wall section 25. As in Fig. As shown in Figure 6, the outer diameter of the first projection 29 is essentially equal to the outer diameter of the second projection 63. In this embodiment, the first regulating section 5 is the first projection 29. The first projection 29 is arranged in the first direction L1 of the first sealing element 11 to regulate the movement of the first sealing element 11 in the first direction L1.

[0019] The housing 2 comprises an upper plate 26, located in the first direction L1 of the first side wall section 23 and covering the impeller 8 in the first direction L1; an intake pipe 21, projecting in the first direction from the center of the upper plate 26; and an outlet pipe 22, extending in a direction perpendicular to the axis of rotation L. The intake pipe 21 is cylindrical, with its center point being the axis of rotation L. The intake pipe 21 is inserted into a flow path pipe 520, which is provided inside the mounting opening 510. The outer surface of the intake pipe 21 has a step 211, which points in the first direction L1. An annular second sealing element 12 is arranged on the step 211. The second sealing element 12 is an O-ring. When the intake pipe 21 is inserted into the flow path pipe 520, the second sealing element 12 deforms elastically between the outer surface of the intake pipe 21 and the inner surface of the flow path pipe 520.The outlet pipe 22 is inserted into a drain pipe (not shown) which is located inside the mounting opening 510.

[0020] As in Fig. As shown in Figure 1, a fastening section 17 is provided between the connecting plate section 24 and the first end face 65, which fastens the housing 2 and the casing 6. In this embodiment, the fastening section 17 is a welded section 171, which is formed by welding a projection 27 provided on the connecting plate section 24 to the first end face 65. This creates a gap S between the second side wall section 25 and the outer surface of the central part 61 of the housing 6.

[0021] The first sealing element 11 is an O-ring. The first sealing element 11 is arranged in contact with the outer surface of the housing 2 and deforms elastically in a radial direction perpendicular to the axis of rotation L between the housing 2 and the inner surface of the mounting opening 510. As shown in Fig. As shown in Figure 6, when the housing 2 is not inserted into the mounting opening 510, the first sealing element 11 projects radially from the first projection 29 by a dimension that is less than half the radial width of the first sealing element 11, viewed in the second direction L2. In this embodiment, when the first sealing element 11 elastically deforms between the housing 2 and the inner surface of the mounting opening 510, it also comes into close contact with the first projection 29 and the second projection 63.

[0022] The impeller 8 is made of resin. The impeller 8 is driven by the motor 10 and rotates around the axis of rotation L. When the impeller 8 rotates around the axis of rotation L together with the rotor 4, the fluid flows in the pump chamber 20 in the direction of rotation. This creates a centrifugal force in the fluid, resulting in low pressure radially inside and high pressure radially outside. The fluid is drawn in through the suction opening of the suction pipe 21 and expelled through the outlet opening of the outlet pipe 22. (Effects)

[0023] The pumping device 100 of the present embodiment comprises a resin housing 2, which covers the impeller 8 from the first direction L1 of the casing 6 and is inserted from the second direction L2 into the mounting opening 510 formed in the mounting element 500, an annular first sealing element 11, which is arranged in contact with the outer surface of the housing 2 and is elastically deformed in a radial direction perpendicular to the axis of rotation between the housing 2 and the inner surface of the mounting opening 510, a first regulating section 5, which is arranged in the first direction L1 of the first sealing element 11 and regulates the movement of the first sealing element 11 in the first direction L1, and a second regulating section 9, which is provided separately from the first regulating section 5 and is arranged in the second direction L2 of the first sealing element 11 to regulate the movement of the first sealing element 11 in the second direction L2.The first regulating section 5 is a first projection 29 that extends radially outwards from the outer surface of the housing 2. The second regulating section 9 is a second projection 63 that extends radially outwards from the outer surface of the central part 61 of the casing 6.

[0024] This allows the first projection 29 and the second projection 63 to be provided separately, so that the resin housing 2, including the first projection 29, can be formed without a parting line forming on the outer surface of the central part 61 that contacts the first sealing element 11. This prevents steps from forming on the outer surface of the central part 61, which improves the adhesion between the first sealing element 11 and the outer surface of the central part 61 and can prevent fluid from leaking out of the mounting opening 510.

[0025] The housing 2 comprises a first side wall section 23, which radially surrounds the impeller 8 from the outside; an annular connecting plate section 24, which projects radially outward from the end of the first side wall section 23 in the second direction L2 and faces a first end face 65 of the housing 6, which points in the first direction L1; and a second side wall section 25, which projects from the outer edge of the connecting plate section 24 in the second direction L2 to surround the casing 6, and on whose outer surface a first sealing element 11 is arranged. A fastening section 17 is provided between the connecting plate section 24 and the first end face 65, which fastens the housing 2 and the casing 6. The fastening section 17 is a welded section 171, which is formed by welding the connecting plate section 24 and the first end face 65 together.A gap S is formed between the second side wall section 25 and the outer surface of the central part 61 of the casing 6. As a result, the resin that melts during the formation of the weld section 171 remains in the gap S, thus preventing the resin from escaping from the housing 2.

[0026] The housing 2 comprises an upper plate 26, which is arranged in the first direction L1 of the first side wall section 23 and covers the impeller 8 from the first direction L1, and a suction tube 21, which projects from the center of the upper plate 26 in the first direction L1 and is inserted into a flow path tube 520 provided inside the mounting opening 510. The second side wall section 25 and the suction tube 21 are shaped such that their axes of rotation L are coaxial. A second sealing element 12 is arranged at the tip of the suction tube 21. This allows the positions of the first sealing element 11, which is positioned on the outer surface of the second side wall section 25, and the second sealing element 12, which is arranged on the outer surface of the suction tube 21, to be controlled accordingly, thus preventing a reduction in adhesion between the first sealing element 11 and the second sealing element 12.

[0027] The first sealing element 11 is an O-ring. The first sealing element 11 projects radially from the first projection 29 by a dimension that is less than half the radial width of the first sealing element 11 compared to the radial width of the first projection 29. This allows the extent of the elastic deformation of the first sealing element 11 to be controlled accordingly. (Other embodiments)

[0028] Fig. Figure 7 shows the second projection 63A of another embodiment. As in Fig. As shown in Figure 7, in this further embodiment the second projection 63 is radially wider than the first projection 29 when viewed from the second direction L2. As a result, when the housing 2 is inserted into the mounting opening 510, the second projection 63 contacts the mounting surface 530 of the mounting element 500, allowing the pump device 100 to be positioned relative to the mounting element 500 in the first direction L1. (Variants)

[0029] In the embodiment described above, the first regulating section 5 was the first projection 29, which extended radially outward in an annular shape from the outer surface of the second side wall section 25 of the housing 2. However, the first regulating section 5 is not limited to the first projection 29. The first regulating section 5 can also be located at a position other than on the housing 2.

[0030] Although the second regulating section 9 is the second projection 63 that extends annularly from the outer surface of the housing 6, the second regulating section 9 is not limited to the second projection 63. The second regulating section 9 can have any configuration, as long as it is provided separately from the first regulating section 5.

[0031] In the embodiment above, the fastening section 17 is the welded section 171, which is formed by welding the connecting plate section 24 and the first end face 65 together. However, the fastening section 17 is not limited to the welded section 171. For example, the fastening section 17 could be a screw that fastens the connecting plate section 24 and the first end face 65 together.

[0032] In the embodiment described above, the second projection 63 is located further in the first direction L1 than the center of the central section 61 and close to the end of the central section 61 in the first direction L1. However, the position of the second projection 63 is not limited to this. The second projection 63 can be located close to the center of the central section 61 or further in the second direction L2 than the center of the central section 61.

[0033] The present technology can be configured as follows. (Addendum 1)

[0034] Pumping device characterized in that it has the following: a motor comprising a rotor, a stator surrounding the outer circumference of the rotor, and a resin coating covering the stator, an impeller arranged in the first direction of the rotor and rotating integrally with the rotor, wherein a first direction runs along the axis of rotation of the rotor and a second direction is opposite to the first direction, a resin housing that covers the impeller from the first direction of the casing and is inserted from the second direction into a mounting opening formed in a mounting element, a first annular sealing element, which is arranged in contact with the outer surface of the housing and deforms elastically in a radial direction perpendicular to the axis of rotation between the housing and the inner surface of the mounting opening, a first regulating section, which is arranged in the first direction of the first sealing element to regulate the movement of the first sealing element in the first direction, and a second regulating section, which is provided separately from the first regulating section and is arranged in the second direction of the first sealing element, in order to regulate the movement of the first sealing element in the second direction. (Addendum 2)

[0035] Pump device according to Supplement 1 characterized in that the first regulating section is a first projection which projects radially outwards from the outer surface of the housing, and the second regulatory section is a second projection that extends radially outwards from the outer surface of the casing. (Addendum 3)

[0036] Pump device according to Supplement 2, wherein the housing comprises a first side wall section radially surrounding the impeller from the outside, an annular connecting plate section projecting radially outwards from the end section of the first side wall section in the second direction and facing a first end face of the casing, which points in the first direction, and a second side wall section projecting in the second direction from the outer edge of the connecting plate section, surrounding the casing and on whose outer surface the first sealing element is arranged, characterized in that a fastening section for fastening the housing and the casing is provided between the connecting plate section and the first end face. (Addendum 4)

[0037] Pumping device according to Supplement 3, wherein the fastening section is a welded section formed by welding the connecting plate section to the first end face, and characterized by the fact that a gap is formed between the second side wall section and the outer surface of the housing. (Addendum 5)

[0038] Pumping device according to Supplement 3 or 4, wherein the housing comprises an upper plate section positioned in the first direction of the first side wall section and covering the impeller from the first direction, and a suction tube projecting from the center of the upper plate section in the first direction and inserted into a flow path tube provided in the mounting opening, and characterized in that the second side wall section and the suction tube are shaped such that their axes of rotation are coaxial, and that a second sealing element is arranged at the tip of the intake manifold. (Addendum 6)

[0039] Pumping device according to one of the amendments 2 to 5, characterized in that the first sealing element is an O-ring and extends radially outwards from the first projection by a dimension which is less than half the radial width compared to the radial width of the first projection. (Addendum 7)

[0040] Pumping device according to one of the amendments 2 to 6, wherein the second projection is wider in the radial direction outwards than the first projection. Reference symbol list 100 pump device, 2 cases, 3 Stator, 3 Addendum, 4 Rotor, 5 first regulatory section, 6. Sheathing, 8 wheel, 9 second regulatory section, 10 engine, 11 first sealing element, 12 second sealing element, 13 radial bearings, 15 magnets, 16 Support shaft, 17 Fastening section, 18 Cover, 19 printed circuit boards, 20 pump chambers, 21 Intake manifold, 22 Outlet pipe, 23 first side wall section, 24 connecting plate section, 25 second side wall section, 26 upper plate section, 27 lead, 29 first lead, 31 Stator core, 32 Insulator, 35 coils, 40 cylinder section, 61 Middle section, 62 pipe section, 63 / 63A second lead, 64 flange, 65 first front surface, 171 Welding section 211th level, 221 Outlet opening, 500 mounting elements, 510 Mounting opening, 520 Flow path tube, 530 mounting surface, L axis of rotation, S gap. QUOTES INCLUDED IN THE DESCRIPTION

[0000] This list of documents cited by the applicant was automatically generated and is included solely for the reader's convenience. The list is not part of the German patent or utility model application. The DPMA accepts no liability for any errors or omissions. Cited patent literature

[0000] JP A 2021-120568 [0002, 0003]

Claims

Pumping device (100), characterized in that it comprises: a motor (10) with a rotor (4), a stator (3) surrounding the outer circumference of the rotor (4), and a resin coating (6) covering the stator (3); an impeller (8) arranged in a first direction of the rotor (4) and rotating integrally with the rotor (4), the first direction being along the axis of rotation of the rotor (4), and the second direction opposite to the first direction; a resin housing (2) covering the impeller (8) from the first direction of the housing (2) and being inserted from the second direction into a mounting opening formed in a mounting element; a first annular sealing element (11) arranged in contact with an outer surface of the housing (2) and elastically deforming in a radial direction perpendicular to the axis of rotation between the housing (2) and the inner surface of the mounting opening; a first regulating section (5);a first regulating section (5) which is arranged in the first direction of the first sealing element (11) and regulates the movement of the first sealing element (11) in the first direction, and a second regulating section (9) which is provided separately from the first regulating section (5) and is arranged in the second direction of the first sealing element (11) and regulates the movement of the first sealing element (11) in the second direction. Pump device (100) according to claim 1, characterized in that the first regulating section (5) is a first projection which extends radially outwards from the outer surface of the housing (2), and in that the second regulating section (9) is a second projection which extends radially outwards from the outer surface of the casing (6). Pump device (100) according to claim 2, wherein the housing (2) comprises a first side wall section that surrounds the impeller (8) from the outside in a radial direction, an annular connecting plate section that projects radially outwards from the edge of the first side wall section in the second direction and faces a first end face of the casing (6) that points in the first direction, and a second side wall section that projects from the outer edge of the connecting plate section in the second direction to surround the casing (6), and on the outer surface of which the first sealing element (11) is arranged, and is characterized in that a fastening section is provided between the connecting plate section and the first end face, which fastens the housing (2) and the casing (6). Pump device (100) according to claim 3, characterized in that the fastening section is a welded section formed by welding the connecting plate section and the first end face, and that a gap is formed between the second side wall section and the outer surface of the casing (6). Pump device (100) according to claim 3 or 4, wherein the housing (2) comprises an upper plate section positioned in the first direction of the first side wall section and covering the impeller (8) from the first direction, and a suction tube projecting from the central section of the upper plate section in the first direction and inserted into a flow path tube provided inside the mounting opening, and is characterized in that the second side wall section and the suction tube are shaped such that their axes of rotation are coaxial, and a second sealing element (12) is arranged at the tip of the suction tube. Pump device (100) according to claim 2, characterized in that the first sealing element (11) is an O-ring, and the first sealing element (11) extends radially outwards from the first projection by a dimension that is less than half the radial width of the first sealing element (11) compared to the radial width of the first projection. Pump device (100) according to claim 2, characterized in that the second projection is wider in the radial direction outwards than the first projection.

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