Pumping equipment

Abstract

To provide a pump device comprising an impeller easy to weld.SOLUTION: In a pump device 1 according to an embodiment, an impeller 3 comprises: a circular first plate 31; a plurality of blade parts 32 protruding on one side from the first plate 31, and arranged at regular intervals in a circumferential direction; and a circular second plate 33 in contact with tip parts 321 on the one side of the blade parts 32. The second plate 33 comprises a first surface 331 facing the one side, and a second surface 335 facing the side opposite to the first surface 331. The first surface 331 comprises a flat surface part 332 that is a flat surface orthogonal to a rotation center axis direction, in an outer peripheral portion. The second surface 335 comprises a second surface side inclined part 336 that is an inclined surface approaching the first plate 31 toward the outside in a radial direction from the inside in the radial direction. The second surface 335 and the tip parts 321 are welded at positions overlapping with the flat surface part 332 in an axial direction.SELECTED DRAWING: Figure 7

Description

[Technical field]

[0001] The present invention relates to a pump device having an impeller with a plurality of blades provided between a pair of circular plates. [Background technology]

[0002] In the pump device, an impeller disposed in a pump chamber is rotated by a motor. Such a pump device is described in, for example, Patent Document 1. In this document, a resin impeller is disposed on one side of the axial direction along which the central axis of rotation of the rotor extends. More specifically, the impeller includes a first disk portion formed integrally with the rotor, a blade protruding from the first disk portion to one side, and a second disk portion abutting against the tip of the blade. In the second disk portion, the entire surface on one side in the axial direction and the entire surface on the other side in the axial direction are inclined surfaces inclined so that the radially inner side is located on one side of the radially outer side. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2018-108024 A Summary of the Invention [Problem to be solved by the invention]

[0004] The impeller of the pump device described in Patent Document 1 has a problem in that it is not easy to join the second disk part to the plate because both sides of the second disk part are entirely inclined. For example, when joining the second disk part to the plate by a method such as adhesion or welding, it is necessary to press the second disk part toward the blade. In this case, the second disk part is pressed via the inclined surface, so that the second disk part is likely to be displaced. In particular, when joining the second disk part to the plate by welding, it is necessary to press a welding head against the second disk part from one side, so it is necessary to position the second disk part using a pressing jig or the like.

[0005] In view of the above problems, an object of the present invention is to provide a pump device including an impeller in which a first plate and a second plate can be easily joined together via blade portions. [Means for solving the problem]

[0006] In order to solve the above problems, the pump device according to the present invention includes a motor having a rotor, a resin impeller that is arranged on one side of an axial direction in which a rotational center axis of the rotor extends and rotates integrally with the rotor, and a case that defines a pump chamber that houses the impeller. The impeller comprises a circular first plate, a plurality of blade portions protruding from the first plate towards the one side and extending radially at a plurality of points in a circumferential direction centered on the rotation central axis, and a circular second plate with which the tips of the plurality of blade portions on the one side abut, the second plate comprises a first surface facing the one side and a second surface facing the opposite side to the first surface, the second surface has a second surface side inclined portion that is inclined obliquely so that the radially inner side is located closer to the one side than the radially outer side and extends in the circumferential direction centered on the rotation central axis, the first surface has a flat portion that is perpendicular to the rotation central axis and extends in the circumferential direction centered on the rotation central axis, and the second plate is welded to the tip portion at a position where the plurality of blade portions and the flat portion overlap when viewed from the axial direction. The tip portion includes a first portion which is a plane perpendicular to the axial direction, and a second portion which is inclined obliquely on the radial inner side or radial outer side of the first portion so that the radial inner side is located closer to the one side than the radial outer side, and the abutted portion of the second plate with which the first portion abuts is a surface provided on the second surface and perpendicular to the rotation central axis, and the first portion and the abutted portion are welded. It is characterized by:

[0007] In the present invention, the second surface of the second plate used in the impeller on the side of the blade portion is provided with an inclined surface, while the first surface of the second plate on the side opposite the blade portion is provided with a flat surface perpendicular to the central axis of rotation of the rotor. Therefore, when joining the second plate and the tip of the blade portion by welding, the welding head of the welding device can be pressed against the flat surface to press the second plate against the blade portion in the axial direction. Therefore, welding of the second plate and the tip of the blade portion can be easily performed. Furthermore, according to this embodiment, both the first portion and the abutted portion are surfaces that are perpendicular to the rotation axis, so that they can be reliably welded.

[0008] In the present invention, a mode can be adopted in which a flat surface perpendicular to the central axis of rotation is provided in a region that overlaps with the flat portion when viewed from the axial direction on the surface of the first plate opposite the second plate. According to this mode, the surface of the first plate opposite the second plate can be easily supported when welding the second plate and the tip of the blade portion.

[0009] In the present invention, the blades may be integrally formed with the first plate. According to this embodiment, even when fluid pressure is applied to the blades, the fluid pressure is applied to the first plate. Therefore, the second plate is less likely to fall off the blades.

[0010] In the present invention, the rotor may include a magnet and a resin holder that holds the magnet, and the first plate may be provided integrally with the holder at the end of the holder on the one side. This makes it easy to integrate the rotor and the first plate.

[0012] In the present invention, a groove including a first housing groove into which the first portion fits can be provided on the second surface, and the abutted portion can be configured by a bottom surface of the first housing groove. According to this aspect, even if burrs are generated when the first portion and the abutted portion are welded together, the burrs are not exposed to the outside from the first housing groove. Therefore, it is possible to prevent the burrs from peeling off from the impeller when the impeller rotates.

[0013] In the present invention, the groove may include a second housing groove into which the second portion fits, and the bottom surface of the second housing groove may be an inclined surface such that the radially inner side is located closer to the one side than the radially outer side. According to this aspect, even if burrs are generated at the boundary between the first portion and the second portion when the first portion and the abutted portion are welded, the burrs are not exposed to the outside from the second housing groove. Therefore, it is possible to prevent the burrs from peeling off from the impeller when the impeller rotates.

[0014] In the present invention, a mode can be adopted in which the first portion is provided radially outward of the second portion.

[0015] In the present invention, a radially outer end of the groove may not reach the outer circumferential edge of the second plate. According to this embodiment, even if a burr is generated on the radially outer end of the first portion when the first portion and the abutted portion are welded together, the burr is not exposed to the outside from the groove. Therefore, it is possible to prevent the burr from peeling off from the impeller when the impeller rotates.

[0016] In the present invention, in the first surface, a radially inner or outer side of the flat portion is provided with a radially inward or outward groove. A first surface side inclined portion inclined so that the inner side is located on the one side from the outer side in the radial direction extends in the circumferential direction around the central axis of rotation, and a portion of the inner wall defining the pump chamber of the case that faces the impeller on the one side includes an inclined surface inclined along the first surface side inclined portion. According to this aspect, loss when the fluid in the pump chamber is moved by the impeller can be suppressed.

[0017] In the present invention, when an opening area of ​​a first opening portion on a radially inner side sandwiched between two of the blade portions adjacent in the circumferential direction between the first plate and the second plate is defined as A, and an opening area of ​​a second opening portion on a radially outer side sandwiched between two of the blade portions adjacent in the circumferential direction between the first plate and the second plate is defined as B, the opening areas A and B are expressed by the following conditional formula: 1.2A≦B≦1.5A According to this aspect, the opening area of ​​the second opening can be configured not to be much larger than the opening area of ​​the first opening, thereby making it possible to suppress a decrease in efficiency of the pump device. Effect of the Invention

[0018] In the present invention, the second surface of the second plate used in the impeller on the side of the blade portion is provided with an inclined surface, while the first surface of the second plate on the side opposite the blade portion is provided with a flat surface perpendicular to the central axis of rotation of the rotor. Therefore, when joining the second plate and the tip of the blade portion by welding, the welding head of the welding device can be pressed against the flat surface to press the second plate against the blade portion in the axial direction. Therefore, welding of the second plate and the tip of the blade portion can be easily performed. [Brief description of the drawings]

[0019] [Figure 1] 1 is a perspective view of a pump device to which the present invention is applied; [Diagram 2] FIG. 2 is a cross-sectional view of the pump device shown in FIG. [Diagram 3] FIG. [Figure 4] FIG. [Diagram 5] FIG. 2 is an exploded perspective view of the impeller as viewed from one side. [Figure 6] FIG. 4 is an exploded perspective view of the impeller as viewed from the other side. [Figure 7] 5A and 5B are diagrams for explaining the relationship between the blade portion and a second plate. [Figure 8] FIG. 13 is an exploded perspective view of the impeller of the first modified example. [Figure 9] 10A and 10B are diagrams illustrating a schematic relationship between the blade portion and a second plate in the first modification. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0020] A pump device including an impeller according to the present invention will be described below with reference to the drawings. In the following description, the direction in which the rotation axis L extends will be described as the axial direction. In the axial direction, one side will be labeled L1 and the other side will be labeled L2. In the following description, the radial direction and circumferential direction around the rotation axis will be simply referred to as the "radial direction" and the "circumferential direction", respectively.

[0021] (Overall composition) Fig. 1 is a perspective view of a pump device 1 to which the present invention is applied. Fig. 2 is a cross-sectional view of the pump device 1 shown in Fig. 1. As shown in Figs. 1 and 2, the pump device 1 has a motor 2 equipped with a rotor 5 that rotates about a central rotation axis L, a resin impeller 3 arranged on one side L1 in the axial direction of the rotor 5, and a case 4 that defines a pump chamber 20 that houses the impeller 3. The pump device 1 moves a fluid in the pump chamber 20 by the impeller 3 rotating integrally with the rotor 5.

[0022] (Motor) The motor 2 includes a rotor 5, a stator 6 located radially outside the rotor 5, a resin bulkhead member 7 covering the stator 6, and a support shaft 8 that rotatably supports the rotor 5. The rotor 5 includes a cylindrical holder 51 extending in the axial direction, and a cylindrical magnet 10 held on the outer circumferential surface of the holder 51.

[0023] The holder 51 is made of resin. The holder 51 has a small diameter portion 52 that holds the magnet 10 on its outer circumferential surface, a circular abutment portion 53 that abuts against an end of the magnet 10 on one side L1, and a large diameter portion 54 that protrudes from the outer circumferential edge of the abutment portion 53 to the one side L1, and the outer diameter dimension of the small diameter portion 52 is smaller than the outer diameter dimension of the large diameter portion 54. The small diameter portion 52 and the large diameter portion 54 are provided coaxially. The small diameter portion 52 holds a bearing 56 therein, and the rotor 5 is rotatably supported on the support shaft 8 via the bearing 56.

[0024] The magnet 10 is a neodymium bonded magnet. The entire magnet 10 is covered with a resin skin layer. The outer diameter of the magnet 10 is approximately the same as the outer diameter of the large diameter portion 54. The magnet 10 and the small diameter portion 52 are bonded together by applying an adhesive between them. At this time, the magnet 10 is positioned by abutting against the abutment portion 53.

[0025] The stator 6 has a stator core 61 and a coil 63 wound around the stator core 61 via an insulator 62. Although detailed description is omitted, the stator core 61 has an annular portion extending in an annular shape and a plurality of salient poles protruding radially inward from the annular portion. The coil 63 is wound between a first flange portion 621 on the radially inner side of the insulator 62 covering the salient poles and a second flange portion 622 on the radially outer side. In this embodiment, the motor 2 is a three-phase motor, and the coil 63 includes a U-phase coil, a V-phase coil, and a W-phase coil.

[0026] The partition member 7 includes a first partition portion 71 facing one side L1, a second partition portion 72 interposed between the stator 6 and the magnet 10, and a third partition portion 73 facing an end face of the other side L2 of the rotor 5. In this embodiment, the partition member 7 is a resin sealing member that covers the stator 6 from both radial and axial sides. The partition member 7 is formed, for example, by insert molding the stator 6 with polyphenylene sulfide (PPS). Alternatively, for example, the partition member 7 may be formed by insert molding the stator 6 with BMC (Bulk Molding Compound) or the like.

[0027] A cover 15 is fixed to the end of the other side L2 of the partition member 7. A board 16, on which a circuit for controlling the power supply to the coil 63 and the like are provided, is disposed between the cover 15 and the partition member 7. In addition, a connector housing 76 is provided in the partition member 7. By connecting a connector to the connector housing 76 to supply power and the like, the rotor 5 of the motor 2 rotates. This causes the impeller 3 to rotate in the pump chamber 20.

[0028] The support shaft 8 is a rod-shaped member made of metal. The central axis of the support shaft 8 coincides with the central axis of rotation of the rotor 5. The end of the other side L2 of the support shaft 8 is press-fitted into a hole 74 formed in the third partition wall 73. An annular plate member 81 is attached to the end of one side L1 of the support shaft 8. The plate member 81 abuts against the end of one side L1 of the bearing 56 protruding from the abutment portion 53.

[0029] (Impeller) Fig. 3 is a perspective view of the impeller 3. Fig. 4 is a cross-sectional view of the impeller 3. Fig. 5 is an exploded perspective view of the impeller 3 as viewed from one side L1. Fig. 6 is an exploded perspective view of the impeller 3 as viewed from the other side L2. Fig. 7 is a diagram for explaining the relationship between the blade portion 32 and the second plate 33. That is, the blade portion 32 extends in the radial direction while curving in the circumferential direction, In FIG. 7, the vanes 32 are shown as extending linearly in the radial direction.

[0030] As shown in FIG. 3 to FIG. 7, the impeller 3 includes a circular first plate 31, a plurality of blades 32 that protrude from the first plate 31 to one side L1 and are arranged at regular intervals in the circumferential direction, and a circular second plate 33 that abuts against the tip 321 of the blade 32 on the one side L1. Each of the plurality of blades 32 is a plate-like shape with its thickness direction facing the circumferential direction. The first plate 31 is integrally provided at the end of the one side L1 of the large diameter portion 54 of the holder 51 of the rotor 5, and protrudes radially outward from the end of the one side L1. That is, the first plate 31 and the holder 51 of the rotor 5 are integrally formed of a resin material. A hole 310 is formed in the center of the first plate 31. In this embodiment, the surface 311 on the one side L1 of the first plate 31 and the surface 312 on the other side L2 are both flat surfaces perpendicular to the axial direction.

[0031] In this embodiment, seven blades 32 are provided in the circumferential direction. When viewed from the axial direction, the blades 32 have a plate shape curved in the circumferential direction. In each blade 32, a radially inner side surface 324 is located radially outward from the hole 310. In each blade 32, a radially outer side surface 325 coincides with the outer peripheral surface of the first plate 31.

[0032] The tip portion 321 includes a first portion 323 perpendicular to the axial direction, and a second portion 322 inclined obliquely so that the radially inner side is located on one side L1 relative to the radially outer side on the radially inner side or radially outer side of the first portion 323. In this embodiment, the first portion 323 is provided radially outer of the second portion 322.

[0033] The second plate 33 has a circular plate shape. The second plate 33 has a hole 330 in the center. The second plate 33 has a first surface 331 facing one side L1 and a second surface 335 facing the other side L2. The first surface 331 has a flat surface 332 that is a plane perpendicular to the axial direction, and the flat surface 332 extends in the circumferential direction. In this embodiment, the first surface 331 extends in the circumferential direction to a first surface side inclined portion 333 that is inclined so that the radially inner side is located closer to the one side L1 than the radially outer side on the radially inner side or radially outer side of the flat surface 332. In this embodiment, the flat surface 332 is provided in an annular shape on the radially outer side of the first surface side inclined portion 333, and the flat surface 332 overlaps with the first portion 323 of the blade portion 32 when viewed from the axial direction.

[0034] In the second surface 335, a second surface side inclined portion 336 extends in the circumferential direction and is inclined obliquely so that the radially inner side is located closer to one side L1 than the radially outer side. In this embodiment, the entire second surface 335 is the second surface side inclined portion 336. Note that the second surface 335 may be configured to partially include the second surface side inclined portion 336. For example, the second surface 335 may include the second surface side inclined portion 336 and a flat portion perpendicular to the axial direction on the radially inner side or radially outer side of the second surface side inclined portion 336.

[0035] The second surface 335 is provided with a groove 334 including a first housing groove 337 that houses the first portion 323, and the groove 334 includes a second housing groove 338 that houses the second portion 322. The first housing groove 337 and the second housing groove 338 are grooves recessed on one side L1. In this embodiment, the first housing groove 337 is provided radially outside the second housing groove 338, and the first housing groove 337 extends to the outer circumferential edge of the second plate 33. When viewed from the axial direction, the first housing groove 337 overlaps with the first portion 323. The bottom surface of the first housing groove 337 is a surface perpendicular to the axial direction, and is an abutted portion 337a against which the first portion 323 of the tip portion 321 abuts. The bottom surface 338a of the second housing groove 338 is continuous with the abutted portion 337a of the first housing groove 337.

[0036] As shown in FIG. 3 and FIG. 4, the impeller 3 has a first opening 34 on the radially inner side sandwiched between two adjacent blade portions 32 in the circumferential direction between the first plate 31 and the second plate 33, and a second opening 34 on the radially inner side sandwiched between two adjacent blade portions 32 in the circumferential direction between the first plate 31 and the second plate 33. and second openings 35 on the radially outer side sandwiched between the blade portions 32. In this embodiment, seven first openings 34 and seven second openings 35 are formed. The opening area of ​​the second openings 35 is larger than the opening area of ​​the first openings 34. In this embodiment, the second surface 335 includes the second surface side inclined portion 336, so that the opening area of ​​the second openings 35 is not excessively larger than the opening area of ​​the first openings 34. More specifically, assuming that the opening area of ​​the first openings 34 is A and the opening area of ​​the second openings 35 is B, the opening areas A and B are configured to satisfy the following conditional formula. 1.2A≦B≦1.5A

[0037] Next, the welding of the impeller will be described. As shown in Fig. 7, the second surface 335 and the tip portion 321 are welded by the welding head 100 of the welding device at a position where they overlap with the flat portion 332 in the axial direction. As a result, the second plate 33 is fixed to the tip portion 321 on one side L1 of the blade portion 32. In this embodiment, the abutted portion 337a, which is the bottom surface of the first accommodating groove 337, is welded to the first portion 323 of the tip portion 321. In this embodiment, since the flat portion 332 is a plane perpendicular to the axial direction, during welding, the welding head 100 of the welding device is pressed against the flat portion 332, so that the second plate 33 can be pressed against the blade portion 32 in the axial direction.

[0038] Here, burrs are generated during welding. The generated burrs are accommodated in first accommodating groove 337 and are not exposed to the outside from first accommodating groove 337. Moreover, burrs generated at the end of first portion 323 connected to second portion 322 are also accommodated in second accommodating groove 338 and are not exposed to the outside from second accommodating groove 338.

[0039] (case) 1 and 2, the case 4 includes an inner wall 43 that constitutes the pump chamber 20, an opposing wall 45 that faces the impeller 3 on one side L1, and a side wall 44 that extends in the circumferential direction. The case 4 includes a suction pipe 41 that extends along the axial direction, and a discharge pipe 42 that extends in a direction perpendicular to the axial direction. The suction pipe 41 and the discharge pipe 42 each have a suction port 41a and a discharge port 42 at their ends. b The suction pipe 41 and the suction port 41a are provided concentrically with respect to the central axis L of rotation. The discharge pipe 42 is located outside the impeller 3 in the radial direction.

[0040] 2, when viewed from a direction perpendicular to the axial direction, the opposing wall 45 has a shape that follows the first surface 331 of the second plate 33. More specifically, the opposing wall 45 includes an inclined surface 451 that is inclined along the first surface side inclined portion 333 and a flat surface portion 452 that follows the flat surface portion 332. The flat surface portion 452 is a surface that is perpendicular to the central axis L of rotation.

[0041] (Action and effect) In the pump device 1 of this embodiment, the second surface 335 and the tip portion 321 are welded to each other at a position where they overlap with the flat portion 332 in the direction of the central axis of rotation. Therefore, even if the second surface 335 of the second plate 33 has the second surface side inclined portion 336 which is an inclined surface approaching the first plate 31 from the radially inner side toward the radially outer side, the second plate 33 can be pressed against the blade portion 32 in the axial direction by pressing the welding head 100 of the welding device against the flat portion 332, so that the second surface 335 and the tip portion 321 can be easily welded to each other.

[0042] In the pump device 1 of this embodiment, a flat surface perpendicular to the central axis of rotation is provided in a region that overlaps with the flat surface portion 332 when viewed from the axial direction on the surface 312 of the first plate 31 opposite to the second plate 33. With this configuration, the surface 312 of the first plate 31 opposite to the second plate 33 can be easily supported when the second plate 33 and the tip portion 321 of the blade portion 32 are welded to each other.

[0043] In the pump device 1 of this embodiment, the plurality of blades 32 are formed integrally with the first plate 31. With this configuration, even when fluid pressure is applied to the blades 32, the fluid pressure is applied to the first plate 31 side. Therefore, the second plate 33 is less likely to fall off the blades.

[0044] In the pump device 1 of this embodiment, the rotor 5 includes a holder 51 that holds the magnet 10, and the first plate 31 is provided integrally with the end of the holder 51 on the L1 side. With this configuration, the rotor 5 and the impeller 3 can be integrated, improving the connection strength compared to a configuration in which the rotor 5 and the impeller 3 are separate. In addition, the number of parts can be reduced.

[0045] In the pump device 1 of this embodiment, the tip portion 321 includes a second portion 322 that is an inclined surface approaching the first plate 31 from the radially inner side toward the radially outer side, and a first portion 323 that is a flat surface perpendicular to the axial direction from the second portion 322 toward the radially outer side. The second surface 335 includes a contact portion 337a that contacts the first portion 323. The contact portion 337a is a flat surface perpendicular to the axial direction, and the first portion 323 and the contact portion 337a are welded. With this configuration, the first portion 323 and the contact portion 337a are surfaces that are perpendicular to each other in the axial direction, so that when the second plate 33 is pressed against the blade portion 32 in the axial direction, they reliably contact each other. This makes it easy to weld the first portion 323 and the contact portion 337a.

[0046] In the pump device 1 of this embodiment, the second surface 335 is provided with a groove 334 including a first accommodating groove 337 into which the first portion 323 fits, and the bottom surface of the first accommodating groove 337 forms the abutted portion 337a. With this configuration, burrs generated when the first portion 323 and the abutted portion 337a are welded together are accommodated in the first accommodating groove 337, and are not exposed to the outside from the first accommodating groove 337. This makes it possible to prevent the burrs from peeling off from the impeller 3 when the pump device 1 is operated.

[0047] In the pump device 1 of this embodiment, the groove 334 includes a second housing groove 338 into which the second portion 322 fits, and a bottom surface 338a of the second housing groove 338 is inclined so that the radially inner side is located on one side L1 from the radially outer side. With this configuration, when the first portion 323 and the abutted portion 337a are welded together, burrs generated at the end of the first portion 323 connected to the second portion 322 are contained in the second housing groove 338 and are not exposed to the outside from the second housing groove 338. Therefore, it is possible to prevent the burrs from peeling off from the impeller 3 when the pump device 1 is operated.

[0048] In the pump device 1 of this embodiment, the first surface 331 has a first surface side inclined portion 333 that is inclined so that the radially inner side is located closer to one side L1 than the radially outer side on the radially inner side of the flat portion 332 and extends in the circumferential direction around the rotation central axis L. Of the inner walls 43 that define the pump chamber 20 of the case 4, the opposing wall 45 that faces the impeller 3 on the one side L1 includes an inclined surface 451 that is inclined along the first surface side inclined portion 333. With this configuration, it is possible to suppress loss when the fluid in the pump chamber is moved by the impeller.

[0049] In the pump device 1 of this embodiment, when the opening area of ​​the first opening 34 on the radially inner side sandwiched between the two circumferentially adjacent blade portions 32 between the first plate 31 and the second plate 33 is A, and the opening area of ​​the second opening 35 on the radially outer side sandwiched between the two circumferentially adjacent blade portions 32 between the first plate 31 and the second plate 33 is B, the opening areas A and B are expressed by the following conditional formula: 1.2A≦B≦1.5A With this configuration, the opening area of ​​the second opening 35 is set to be smaller than the opening area of ​​the first opening 34. The positive pressure can be prevented from becoming extremely larger than the positive pressure, thereby making it possible to suppress a decrease in the efficiency of the pump device.

[0050] (Variation 1) Fig. 8 is an exploded perspective view of the impeller 3 of the first modification. Fig. 9 is a diagram for explaining the relationship between the blade portion 32 and the second plate 33 in the first modification. The impeller 3 of the first modification is different from the above-mentioned impeller 3 in the configuration of the first accommodating groove 337 and the side surface portion 325, but the other configuration is the same. Therefore, in the explanation of the impeller 3 of the first modification, the same reference numerals are used to designate the configuration corresponding to the above-mentioned impeller 3, and the explanation thereof will be omitted.

[0051] As shown in Figs. 8 and 9, in the second plate 33, the radially outer end of the groove 334 does not reach the outer circumferential edge of the second plate 33. Therefore, the side surface portion 325 of the blade portion 32 has a notch portion 326 that is notched at the end of one side L1. The first housing groove 337 has an opposing wall portion 339 at the radially outer end. The opposing wall portion 339 closes the radially outer side of the first housing groove 337. As shown in Fig. 9, the opposing wall portion 339 covers the notch portion 326 from the radially outer side. In this embodiment, since the radially outer side of the first housing groove 337 is closed by the opposing wall portion 339, burrs generated at the radially outer end of the first portion 323 during welding are reliably accommodated in the first housing groove 337 compared to the above embodiment. Therefore, the burrs are not exposed to the outside from the first housing groove 337. Therefore, compared to the above embodiment, it is possible to further prevent the burrs from peeling off from the impeller 3 when the pump device 1 is operated.

[0052] (Other variations) In the embodiment described above, the second plate 33 is provided with the second accommodating groove 338, but the second plate 33 may not be provided with the second accommodating groove 338.

[0053] In the embodiment described above, the first plate 31 and the large diameter portion 54 of the rotor 5 are integrally formed from a resin material, but they may be configured as separate bodies. [Explanation of symbols]

[0054] Reference Signs List 1...pump device, 2...motor, 3...impeller, 4...case, 5...rotor, 6...stator, 7...partition member, 8...support shaft, 10...magnet, 15...cover, 16...substrate, 20...pump chamber, 31...first plate, 32...blade portion, 33...second plate, 34...first opening, 35...second opening, 41...suction pipe, 41a...suction port, 42...discharge pipe, 42 b...discharge port, 43...inner wall, 44...side wall, 45...opposing wall, 51...holder, 52...small diameter portion, 53...contact portion, 54...large diameter portion, 56...bearing, 61...stator core, 62...insulator, 63...coil, 71...first partition portion, 72...second partition portion, 73...third partition portion, 74...hole portion, 76...connector housing, 81...plate member, 100...welding head, 310...hole portion, 321...tip portion, 322...second portion minute, 323...first part, 324...side part, 325...side part, 326...notch part, 330...hole part, 331...first surface, 332...plane part, 333...first surface side inclined part, 334...groove, 335...second surface, 336...Second surface side inclined part, 337...First accommodation groove, 337a...Abutted part, 338...Second accommodation groove, 338a...Bottom surface, 339...Opposing wall part, 621...First flange, 622...Second flange, L...Rotation center axis

Claims

1. A motor having a rotor; a resin impeller disposed on one side of the axial direction in which the rotational center axis of the rotor extends and rotates integrally with the rotor; a case defining a pump chamber that houses the impeller; having the impeller includes a circular first plate, a plurality of blade portions protruding from the first plate toward the one side and extending radially at a plurality of locations in a circumferential direction centered on the central axis of rotation, and a circular second plate against which the tip portions of the plurality of blade portions on the one side abut, The second plate includes a first surface facing the one side and a second surface facing an opposite side to the first surface, In the second surface, a second surface side inclined portion inclined obliquely so that a radially inner side is located closer to the one side than a radially outer side extends in a circumferential direction around the rotation central axis, In the first surface, a planar portion perpendicular to the rotation central axis extends in a circumferential direction around the rotation central axis, the second plate is welded to the tip portion at a position where the plurality of blade portions and the flat portion overlap when viewed from the axial direction, The tip portion includes a first portion which is a plane perpendicular to the axial direction, and a second portion which is inclined obliquely on the radial inner side or the radial outer side of the first portion such that the radial inner side is located closer to the one side than the radial outer side, a contact portion of the second plate with which the first portion contacts is a surface that is provided on the second surface and is perpendicular to the rotation central axis, The first portion and the abutted portion are welded to each other, The second surface is provided with a groove including a first receiving groove into which the first portion fits, The abutment portion is configured by a bottom surface of the first accommodating groove, the groove includes a second receiving groove into which the second portion fits; a bottom surface of the second accommodating groove is a surface that is inclined obliquely so that a radially inner side is located closer to the one side than a radially outer side, A pump device, characterized in that a radially outer end of the groove does not reach an outer circumferential edge of the second plate.

2. 2. The pump device according to claim 1, a pump device characterized in that a plane perpendicular to the central axis of rotation is provided on a surface of the first plate opposite the second plate in an area overlapping with the planar portion when viewed from the axial direction.

3. 3. The pump device according to claim 1, The pump device, wherein the plurality of blade portions are integrally formed with the first plate.

4. A pump device according to any one of claims 1 to 3, The rotor includes a magnet and a resin holder that holds the magnet. The pump device according to claim 1, wherein the first plate is provided integrally with the holder at the one end of the holder.

5. A pump device according to any one of claims 1 to 4, The pump device, wherein the first portion is provided radially outward of the second portion.

6. A pump device according to any one of claims 1 to 5, In the first surface, a first surface side inclined portion inclined so that the radially inner side is located on the radially inner side or the radially outer side of the flat portion and is located on the radially one side relative to the radially outer side extends in a circumferential direction around the rotation central axis, A pump device characterized in that a portion of an inner wall of the case that defines the pump chamber and faces the impeller on the one side includes an inclined surface that is inclined along the first surface side inclined portion.

7. The pump device according to any one of claims 1 to 6, When an opening area of ​​a first opening portion on a radially inner side sandwiched between two of the blade portions adjacent in the circumferential direction between the first plate and the second plate is defined as A, and an opening area of ​​a second opening portion on a radially outer side sandwiched between two of the blade portions adjacent in the circumferential direction between the first plate and the second plate is defined as B, the opening areas A and B are expressed by the following conditional formula: 1.2A≦B≦1.5A A pump device characterized in that:

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