Pump device and method for manufacturing pump device

Abstract

Provided are a pump device and a method for manufacturing the same, the pump device comprising an impeller having a first blade member on which a plurality of blades are formed, and a second blade member which is formed separately from the first blade member and is fixed to the first blade member, compared with the prior art, the relative position accuracy of the first blade part and the second blade part in the radial direction of the rotor can be improved. In this pump device, a first vane member (21) is provided with a positioning protrusion (21c) for positioning a second vane member (22) with respect to the first vane member, and the second vane member is formed with a positioning recess (22e) that engages with the positioning protrusion (21c). The inside surface of the positioning projection (21c) in the radial direction of the rotor is a positioning surface for positioning the second blade member (22) with respect to the first blade member (21) in the radial direction of the rotor, and the positioning surface is a concave curved surface having an arc shape with the axis of the impeller (2) as the center of curvature when viewed from the axial direction of the rotor.

Description

Technical Field

[0001] The present invention relates to a pump device having an impeller and a motor for rotating the impeller. The present invention also relates to a method for manufacturing such a pump device. Background Art

[0002] Conventionally, a pump device having a resin impeller disposed in a pump chamber and a motor for driving the impeller to rotate has been known (for example, refer to Patent Document 1). In the pump device described in Patent Document 1, the motor includes: a rotor having a drive magnet; and a stator having a drive coil. The impeller includes: a plurality of blades; a base portion integrally formed with the plurality of blades; and a cover portion (impeller cover) formed separately from the blades and the base portion. The base portion of the impeller is integrally formed with a magnet holding member that holds the drive magnet, and the impeller rotates together with the rotor. The axis of the impeller coincides with the axis of the rotor.

[0003] In the pump device described in Patent Document 1, the cover portion is fixed to the end faces of the plurality of blades (specifically, one end face of the plurality of blades in the axial direction of the rotor) by ultrasonic welding. Protrusions for welding and fixing the cover portion to the plurality of blades are formed on the end faces of the plurality of blades before fixing the cover portion. In addition, cylindrical positioning pins are formed on the end faces of the plurality of blades, and the positioning pins are used to position the cover portion relative to the blades and the base portion in the radial direction of the rotor and the circumferential direction of the rotor.

[0004] In the pump device described in Patent Document 1, the plurality of positioning pins are arranged, for example, on an imaginary circle having the axis of the impeller as the center of curvature when viewed from the axial direction of the rotor. The cover portion is formed with a plurality of engagement holes for engaging the positioning pins. In the pump device described in Patent Document 1, the outer peripheral surface of the positioning pin is used to position the cover portion relative to the blades and the base portion in the radial direction of the rotor and the circumferential direction of the rotor. Prior Art Documents Patent Documents

[0005] Patent Document 1: Specification of Chinese Patent Application Publication No. 113790161 Summary of the Invention

[0006] The inventors of the present application have developed a pump device, which includes an impeller disposed in a pump chamber and a motor for rotating the impeller. In this pump device, the impeller includes: a resin-made first blade member; and a resin-made second blade member formed separately from the first blade member. Similar to the impeller described in Patent Document 1, the first blade member includes: a plurality of blades arranged at a constant pitch in the circumferential direction of the rotor; and a base portion connected to the base ends of the plurality of blades. The second blade member is fixed, such as by welding, to one end surface of the plurality of blades in the axial direction of the rotor. In the pump device under development, in order to ensure the performance of the pump device, it is preferable to improve the relative position accuracy of the first blade member and the second blade member in the radial direction of the rotor.

[0007] Therefore, the problem to be solved by the present invention is to provide a pump device including an impeller having a resin-made first blade member formed with a plurality of blades and a resin-made second blade member formed separately from and fixed to the first blade member, and capable of achieving higher relative position accuracy of the first blade member and the second blade member in the radial direction of a rotor that rotates together with the impeller than in the past. Another problem to be solved by the present invention is to provide a manufacturing method for such a pump device.

[0008] To solve the above problems, the pump device of the present invention includes: a motor having a rotor and a stator; and an impeller that rotates together with the rotor. The impeller includes: a resin-made first blade member having three or more blades arranged at a constant pitch in the circumferential direction of the rotor; and a resin-made second blade member formed separately from the first blade member and fixed to the first blade member. The axis of the impeller coincides with the axis of the rotor. When one side in the axial direction of the rotor is defined as the first direction side and the opposite side of the first direction side is defined as the second direction side, the second blade member is disposed on the first direction side of the first blade member. The first blade member includes: a base portion to which the ends of the plurality of blades on the second direction side are connected; and three or more positioning protrusions for positioning the second blade member relative to the first blade member in the circumferential direction and the radial direction of the rotor. The positioning protrusions are formed on the surface of the three or more blades on the first direction side and protrude toward the first direction side. Positioning recesses that engage with the positioning protrusions are formed on the second blade member. The inner surface of the positioning protrusion in the radial direction of the rotor serves as a positioning surface for positioning the second blade member relative to the first blade member in the radial direction of the rotor. The positioning surface is a concave curved surface or a flat surface that is recessed toward the outer side in the radial direction of the rotor. When the positioning surface is a concave curved surface, the shape of the positioning surface when viewed from the axial direction of the rotor is an arc shape with the axis of the impeller as the center of curvature. An abutting surface that abuts against the positioning surface is formed in the positioning recess.

[0009] In the pump device of the present invention, the first blade member includes a plurality of positioning protrusions for positioning the second blade member relative to the first blade member in the circumferential direction and the radial direction of the rotor. A positioning recess is formed in the second blade member and engages with the positioning protrusion. Further, in the present invention, the inner side surface of the positioning protrusion in the radial direction of the rotor serves as a positioning surface for positioning the second blade member relative to the first blade member in the radial direction of the rotor, and a contact surface that contacts the positioning surface is formed in the positioning recess. Further, in the present invention, the positioning surface is a concave curved surface or a flat surface that is recessed toward the outer side in the radial direction of the rotor. When the positioning surface is a concave curved surface, the shape of the positioning surface as viewed from the axial direction of the rotor is an arc shape with the axis of the impeller as the center of curvature.

[0010] Therefore, in the present invention, the dimensional tolerance of the positioning surface relative to the axis of the impeller can be directly specified. In contrast, in the pump device described in Patent Document 1, the outer peripheral surface of the positioning pin is used to position the cover portion relative to the blade and the base portion in the radial direction of the rotor. The dimensional tolerance of the outer peripheral surface of the positioning pin relative to the axis of the impeller is the sum of the dimensional tolerance of the center of the positioning pin relative to the axis of the impeller and the dimensional tolerance of the outer diameter of the positioning pin. Therefore, in the present invention, compared with the deviation of the position of the outer peripheral surface of the positioning pin relative to the axis of the impeller in the pump device described in Patent Document 1, the deviation of the positioning surface relative to the axis of the impeller can be suppressed. As a result, in the present invention, the relative position accuracy of the first blade member and the second blade member in the radial direction of the rotor can be improved compared with the prior art.

[0011] In the present invention, it is preferable that the positioning surface is a concave curved surface, and when viewed from the axial direction of the rotor, the radius of curvature of all of the plurality of positioning surfaces is equal. If configured in this way, the shape of the first blade member can be simplified compared with the case where the positioning surfaces include positioning surfaces having different radii of curvature when viewed from the axial direction of the rotor.

[0012] In the present invention, for example, the positioning surface is a flat surface, and when viewed from the axial direction of the rotor, the perpendicular bisector of the positioning surface passes through the axis of the impeller.

[0013] In the present invention, it is preferable that the outer side surface of the positioning protrusion in the radial direction of the rotor constitutes a part of the outer peripheral surface of the first blade member. That is, in the present invention, it is preferable that the positioning protrusion is formed at the end portion on the outer peripheral side of the first blade member. If configured in this way, the relative position accuracy of the first blade member and the second blade member in the circumferential direction of the rotor can be improved.

[0014] In the present invention, it is preferable that a welding protrusion mark is formed on the first direction side of the blade. The welding protrusion mark is the root of the protrusion for welding that is melted when the second blade component is welded and fixed to multiple blades. The positioning surface is arranged at a position radially outside the welding protrusion mark on the rotor with a gap therebetween in the radial direction of the rotor. If configured in this way, compared with the case where the welding protrusion mark and the positioning surface are connected in the radial direction of the rotor (i.e., the case where the protrusion for welding and the positioning surface are connected in the radial direction of the rotor), the area of the positioning surface can be enlarged. Therefore, the first blade component and the second blade component can be positioned with higher precision in the radial direction of the rotor. In addition, if configured in this way, the second blade component can also be welded and fixed to the blade between the welding protrusion mark and the positioning surface.

[0015] In the present invention, it is preferable that a welding protrusion mark is formed on the first direction side of the blade. The welding protrusion mark is the root of the protrusion for welding that is melted when the second blade component is welded and fixed to multiple blades. The positioning surface is arranged at a position radially outside the welding protrusion mark on the rotor, and the width of the positioning protrusion in the circumferential direction of the rotor is wider than the width of the welding protrusion mark in the circumferential direction of the rotor. If configured in this way, the width of the positioning protrusion in the circumferential direction of the rotor can be enlarged, so the strength of the positioning protrusion can be improved. Therefore, damage to the positioning protrusion can be prevented when positioning the first blade component and the second blade component in a state where the positioning protrusion is engaged with the positioning recess.

[0016] In the present invention, it is preferable that the width of the positioning protrusion in the formation direction of the blade when viewed from the axial direction of the rotor is wider than the width of the positioning protrusion in the circumferential direction of the rotor. If configured in this way, the strength of the positioning protrusion can be improved. Therefore, damage to the positioning protrusion can be prevented when positioning the first blade component and the second blade component in a state where the positioning protrusion is engaged with the positioning recess.

[0017] In the present invention, it is preferable that the width of the positioning protrusion in the circumferential direction of the rotor is equal to the width of the blade in the circumferential direction of the rotor. If configured in this way, the width of the positioning protrusion in the circumferential direction of the rotor can be enlarged, so the strength of the positioning protrusion can be improved. Therefore, damage to the positioning protrusion can be prevented when positioning the first blade component and the second blade component in a state where the positioning protrusion is engaged with the positioning recess.

[0018] In the present invention, for example, the shape of the positioning protrusion when viewed from the axial direction of the rotor is a polygon.

[0019] In the present invention, for example, the blade includes: a blade body connected to a base; and a protrusion formed along the blade body on a surface of the blade body on the first direction side and protruding from the blade body toward the first direction side. A groove portion is formed on a surface of the second blade member on the second direction side, recessed toward the first direction side and for the protrusion to enter. The positioning protrusion is arranged radially outside the protrusion on the rotor, formed on the surface of the blade body on the first direction side and protruding from the blade body toward the first direction side. The height of the positioning protrusion in the axial direction of the rotor is higher than the height of the protrusion in the axial direction of the rotor. In this case, before the protrusion is completely inserted into the groove portion, the positioning protrusion is engaged with the positioning recess, so that the second blade member can be positioned relative to the first blade member in the circumferential direction and the radial direction of the rotor.

[0020] In the present invention, it is preferable that the positioning recess penetrates the second blade member in the axial direction of the rotor. If configured in this way, compared with the case where the positioning recess does not penetrate the second blade member in the axial direction of the rotor, the height of the positioning protrusion in the axial direction of the rotor can be increased, so that the strength of the positioning protrusion can be increased. Therefore, damage to the positioning protrusion can be prevented when positioning the first blade member and the second blade member in a state where the positioning protrusion is engaged with the positioning recess.

[0021] In the present invention, for example, the blade includes: a blade body connected to a base; and a protrusion formed along the blade body on a surface of the blade body on the first direction side and protruding from the blade body toward the first direction side. The surface of the blade body on the first direction side is an inclined surface that inclines toward the first direction side as it approaches the inner peripheral side of the impeller. The surface of the protrusion on the first direction side is a plane orthogonal to the axial direction of the rotor. The surface of the second blade member on the second direction side is an inclined surface that inclines toward the first direction side as it approaches the inner peripheral side of the impeller. A groove portion is formed on a surface of the second blade member on the second direction side, recessed toward the first direction side and for the protrusion to enter. The surface of the groove portion on the first direction side is a plane orthogonal to the axial direction of the rotor. The depth of the groove portion becomes shallower as it approaches the inner peripheral side of the impeller. On the surface of the protrusion on the first direction side, a welding protrusion trace is formed along the protrusion. The welding protrusion trace is the root of the protrusion for welding that melts when the second blade member is welded and fixed to multiple blades. The width of the welding protrusion trace becomes narrower as it approaches the inner peripheral side from the outer peripheral side of the impeller.

[0022] In this case, since the width of the welding protrusion trace becomes narrower as it approaches the inner peripheral side from the outer peripheral side of the impeller, the volume of the protrusion for welding before melting can be made smaller as it approaches the inner peripheral side from the outer peripheral side of the impeller. Therefore, even if the depth of the groove portion becomes shallower as it approaches the inner peripheral side of the impeller, it is possible to suppress the melted portion of the protrusion for welding from overflowing from the groove portion.

[0023] The pump device of the present invention is manufactured, for example, by a manufacturing method of a pump device including a welding and fixing process of welding and fixing a second vane member to a plurality of vanes. In this manufacturing method, a welding protrusion as a protrusion for welding is formed on the surface on the first direction side of the protrusion before the welding and fixing process. The height of the welding protrusion in the axial direction of the rotor is constant. The cross-sectional shape of the welding protrusion in the orthogonal direction, which is the direction orthogonal to the formation direction of the vane when viewed from the axial direction of the rotor, is a triangle or trapezoid whose width gradually narrows toward the first direction side. The angle formed by the two hypotenuses of the welding protrusion when viewed from the orthogonal direction gradually decreases toward the inner peripheral side of the impeller. The width of the second direction side of the welding protrusion gradually narrows toward the inner peripheral side of the impeller. In the welding and fixing process, the welding protrusion is melted in a state where the protrusion and the welding protrusion are disposed in the groove portion.

[0024] In this manufacturing method, the height of the welding protrusion in the axial direction of the rotor is constant. Further, in this manufacturing method, the cross-sectional shape of the welding protrusion in the orthogonal direction is a triangle or trapezoid whose width gradually narrows toward the first direction side. Moreover, in this manufacturing method, the angle formed by the two hypotenuses of the welding protrusion when viewed from the orthogonal direction gradually decreases toward the inner peripheral side of the impeller, and the width of the second direction side of the welding protrusion gradually narrows toward the inner peripheral side of the impeller. That is, the volume of the welding protrusion becomes smaller from the outer peripheral side to the inner peripheral side of the impeller. Therefore, if the pump device is manufactured by this manufacturing method, even if the depth of the groove portion becomes shallower toward the inner peripheral side of the impeller, it is possible to suppress the melted portion of the welding protrusion from overflowing from the groove portion.

[0025] In the present invention, it is preferable that the first direction side end of the positioning protrusion is disposed at a position on the first direction side with respect to the first direction side end of the welding protrusion. If configured in this way, the positioning protrusion engages with the positioning recess before the first direction side end of the welding protrusion contacts the surface on the first direction side of the groove portion, and it is possible to position the second vane member relative to the first vane member in the circumferential direction and the radial direction of the rotor by using the positioning protrusion and the positioning recess. That is, in a state where the first direction side end of the welding protrusion does not contact the surface on the first direction side of the groove portion, the second vane member can be positioned relative to the first vane member by the positioning protrusion and the positioning recess. Therefore, it is possible to prevent damage to the welding protrusion when the second vane member is positioned relative to the first vane member by the positioning protrusion and the positioning recess.

[0026] As described above, in the present invention, in a pump device having an impeller, the relative position accuracy in the radial direction between a first blade member and a second blade member of a rotor that rotates together with the impeller can be improved as compared with the prior art. The impeller has a resin-made first blade member formed with a plurality of blades and a resin-made second blade member that is separately formed from and fixed to the first blade member. Further, if a pump device is manufactured by the manufacturing method of the pump device of the present invention, even if the depth of a groove portion formed on the surface on the second direction side of the second blade member becomes shallower toward the inner peripheral side of the impeller, it is possible to suppress the molten portion of a welding projection formed on the first blade member from overflowing from the groove portion. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 is a cross-sectional view of a pump device according to an embodiment of the present invention. Figure 2 is Figure 1 a perspective view of the impeller shown in Figure 3 is Figure 2 a perspective view of the first blade member shown in Figure 4 is Figure 3 a top view of the first blade member shown in Figure 5 is Figure 4 an enlarged view of part E in Figure 6 is a perspective view showing the second blade member from different directions Figure 2 shown in Figure 7 is Figure 6 a bottom view of the second blade member shown in Figure 8 is a cross-sectional view for explaining Figure 3 the cross-sectional shape of the welding projection shown in DETAILED DESCRIPTION OF THE EMBODIMENTS

[0028] Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[0029] (Overall Structure of the Pump Device) Figure 1 is a cross-sectional view of a pump device 1 according to an embodiment of the present invention. In the following description, the Z1 direction side such as Figure 1 is set as the "upper" side, and the Z2 direction side such as Figure 1 which is the opposite side of the upper side is set as the "lower" side.

[0030] The pump device 1 of the present embodiment is a type of pump called a canned pump (canned motor pump), and is used, for example, to circulate a liquid for cooling. The pump device 1 includes an impeller 2, a motor 3 that rotates the impeller 2, and a circuit board 4 that controls the motor 3. The motor 3 includes a rotor 5 and a stator 6. The impeller 2, the motor 3, and the circuit board 4 are disposed inside a housing 10 formed by a housing 7, a cover 8 that covers the upper side of the housing 7, and a shroud 9 that covers the lower side of the housing 7.

[0031] The housing 7, the cover 8, and the shroud 9 are formed of resin. The cover 8 is joined to the upper end of the housing 7 by ultrasonic welding, and the shroud 9 is joined to the lower end of the housing 7 by ultrasonic welding. A fluid suction portion 8a and a fluid discharge portion 8b are formed in the cover 8. A pump chamber 11 is formed inside the housing 10, and the fluid sucked from the suction portion 8a passes through the pump chamber 11 toward the discharge portion 8b. The pump chamber 11 is defined by the housing 7 and the cover 8.

[0032] The rotor 5 includes: a cylindrical drive magnet 14; a magnet holding member 15 that holds the drive magnet 14; and a cylindrical sleeve 16 held by the magnet holding member 15. The magnet holding member 15 is formed in a cylindrical shape. Specifically, the magnet holding member 15 is formed in a substantially cylindrical shape. The axial direction of the drive magnet 14, the axial direction of the magnet holding member 15, and the axial direction of the sleeve 16 coincide with the vertical direction.

[0033] The magnet holding member 15 is formed of resin. The magnet holding member 15 includes: a first cylindrical portion 15a that constitutes the lower side portion of the magnet holding member 15; a second cylindrical portion 15b that constitutes the upper side portion of the magnet holding member 15; and a flange portion 15c disposed between the first cylindrical portion 15a and the second cylindrical portion 15b in the vertical direction. The magnet holding member 15 of the present embodiment is composed of the first cylindrical portion 15a, the second cylindrical portion 15b, and the flange portion 15c. The first cylindrical portion 15a and the second cylindrical portion 15b are formed in a cylindrical shape. The flange portion 15c is formed in a flange shape that expands toward the radial outside of the rotor 5. In addition, the flange portion 15c is formed in an annular shape. The outer diameter of the flange portion 15c is larger than the outer diameters of the first cylindrical portion 15a and the second cylindrical portion 15b.

[0034] The drive magnet 14 is disposed on the outer peripheral side of the first cylindrical portion 15a. The drive magnet 14 is fixed to the first cylindrical portion 15a. The upper end surface of the drive magnet 14 contacts the lower surface of the flange portion 15c. The sleeve 16 is disposed on the inner peripheral side of the first cylindrical portion 15a. The sleeve 16 is integrally formed with the first cylindrical portion 15a by insert molding, for example. The rotor 5 is rotatably supported on the fixed shaft 17 and can rotate about the fixed shaft 17 as the center of rotation. The fixed shaft 17 is arranged such that its axial direction coincides with the vertical direction. That is, the vertical direction is the axial direction of the rotor 5. In the present embodiment, the upper side (Z1 direction side) becomes one side of the axial direction of the rotor 5, i.e., the first direction side, and the lower side (Z2 direction side) becomes the opposite side of the first direction side, i.e., the second direction side.

[0035] The upper end portion of the fixed shaft 17 is held by the housing 8. The lower end portion of the fixed shaft 17 is held by the outer housing 7. The fixed shaft 17 is inserted into the inner peripheral side of the sleeve 16. A thrust bearing member 18 that contacts the upper end surface of the sleeve 16 is mounted on the fixed shaft 17. In the present embodiment, the sleeve 16 functions as a radial bearing of the rotor 5, and the sleeve 16 and the thrust bearing member 18 function as a thrust bearing of the rotor 5. The portion of the housing 8 that holds the upper end portion of the fixed shaft 17 and the thrust bearing member 18 are disposed on the inner peripheral side of the second cylindrical portion 15b.

[0036] The impeller 2 is disposed on the upper side of the rotor 5. The impeller 2 rotates together with the rotor 5. The axis of the impeller 2 coincides with the axis of the rotor 5. That is, the axis of the impeller 2 coincides with the axis of the fixed shaft 17. The impeller 2 and the rotor 5 are disposed in the pump chamber 11. The impeller 2 includes: a first blade member 21 having a plurality of blades 21a arranged at a constant pitch in the circumferential direction of the rotor 5; and a second blade member 22 that is formed separately from the first blade member 21 and is fixed to the first blade member 21. The impeller 2 of the present embodiment is composed of the first blade member 21 and the second blade member 22. The specific structure of the impeller 2 will be described later.

[0037] The stator 6 is integrally formed in a substantially cylindrical shape. The stator 6 is disposed on the outer peripheral side of the rotor 5. The stator 6 includes a drive coil 23, a stator core 24, and an insulator 25. The stator core 24 includes: an outer peripheral ring portion formed in a ring shape; and a plurality of salient pole portions that project radially inward from the outer peripheral ring portion toward the rotor 5. The front end surface of the salient pole portion faces the outer peripheral surface of the drive magnet 14 with a later-described cylindrical portion 7a that forms a part of the outer housing 7 interposed therebetween. The insulator 25 is formed of an insulating material such as resin. The drive coil 23 is wound around the salient pole portion of the stator core 24 with the insulator 25 interposed therebetween.

[0038] As described above, the housing 7 is formed of resin. The housing 7 is integrally formed with the stator 6 so as to cover the drive coil 23, the stator core 24, and the insulator 25. In the present embodiment, the housing 7 and the stator 6 are integrally formed by insert molding. The housing 7 includes: a cylindrical portion 7a that is disposed between the front end surface of the salient pole portion of the stator core 24 and the outer peripheral surface of the drive magnet 14; and a bottom portion 7b that closes the lower end of the cylindrical portion 7a. The circuit board 4 is disposed below the bottom portion 7b.

[0039] The circuit board 4 is a rigid board such as a glass epoxy board and is formed in a flat plate shape. The circuit board 4 is disposed such that the thickness direction of the circuit board 4 coincides with the vertical direction. Further, the circuit board 4 is disposed outside the pump chamber 11. The circuit board 4 is fixed to the housing 7 by fixing screws 27. The drive coil 23 is electrically connected to the circuit board 4. The housing 7 functions to prevent the fluid in the pump chamber 11 from flowing into the portions where the stator 6 and the circuit board 4 are disposed. The cover 9 is fixed to the lower end of the housing 7 so as to cover the circuit board 4 from below.

[0040] (Structure of the impeller) Figure 2 is Figure 1 a perspective view of the impeller 2 shown in Figure 3 is Figure 2 a perspective view of the first blade member 21 shown in Figure 4 is Figure 3 a top view of the first blade member 21 shown in Figure 5 is Figure 4 an enlarged view of part E of Figure 6 is shown from different directions Figure 2 a perspective view of the second blade member 22 shown in Figure 7 is Figure 6 a bottom view of the second blade member 22 shown in. In the following description, the radial direction of the rotor 5 is referred to as the "radial direction", and the circumferential direction (circumference direction) of the rotor 5 is referred to as the "circumferential direction".

[0041] As described above, the impeller 2 is composed of the first blade member 21 and the second blade member 22. The first blade member 21 and the second blade member 22 are formed of resin. The first blade member 21 is integrally formed with the magnet holding member 15 by injection molding. That is, the magnet holding member 15 and the first blade member 21 are one resin part integrally formed. The second blade member 22 is disposed above the first blade member 21 and is fixed above the first blade member 21. The second blade member 22 is fixed to the first blade member 21 by welding such as ultrasonic welding.

[0042] The first blade member 21 includes: more than three blades 21a; a base portion 21b to which the lower ends of the plurality of blades 21a are connected; and more than three positioning protrusions 21c for positioning the second blade member 22 relative to the first blade member 21 in the circumferential and radial directions. The first blade member 21 of the present embodiment is composed of a plurality of blades 21a, a base portion 21b, and a plurality of positioning protrusions 21c. In addition, the first blade member 21 of the present embodiment has ten blades 21a and ten positioning protrusions 21c.

[0043] As described above, the first blade member 21 is integrally formed with the magnet holding member 15 by injection molding. The base portion 21b is formed in a flange shape that extends radially outward from the upper end of the magnet holding member 15. That is, the base portion 21b is formed in a flange shape that extends radially outward from the upper end of the second cylindrical portion 15b, and the upper end of the second cylindrical portion 15b is connected to the base portion 21b. The base portion 21b is formed in an annular and flat shape. The thickness direction of the base portion 21b is the same as the up-down direction. The outer diameter of the base portion 21b is larger than the outer diameter of the flange portion 15c of the magnet holding member 15.

[0044] The ten blades 21a are arranged at regular intervals in the circumferential direction on the upper surface of the base portion 21b. The blades 21a project upward from the base portion 21b. The shape of the blade 21a when viewed from the up-down direction is curved. For example, the shape of the blade 21a when viewed from the up-down direction is arc-shaped. The blade 21a includes: a blade main body 21d that is connected to the base portion 21b and applies a centrifugal force to the fluid; and a protruding portion 21e that projects upward from the blade main body 21d.

[0045] The outer shape of the blade main body 21d when viewed from the up-down direction is the same as the outer shape of the blade 21a when viewed from the up-down direction. The blade main body 21d is formed in substantially the entire area between the inner circumferential surface and the outer circumferential surface of the base portion 21b. The end surface on the radially inner side of the blade main body 21d is arranged at a position slightly outside the inner circumferential surface of the base portion 21b in the radial direction. The end surface on the radially outer side of the blade main body 21d constitutes a part of the outer circumferential surface of the base portion 21b. That is, the end surface on the radially outer side of the blade main body 21d constitutes a part of the outer circumferential surface of the first blade member 21. The upper surface of the blade main body 21d is an inclined surface that is inclined upward as it approaches the inner circumferential side of the impeller 2.

[0046] The protrusion 21e is formed on the upper surface of the blade body 21d. Additionally, the protrusion 21e is formed along the blade body 21d. When viewed from the vertical direction, the shape of the protrusion 21e is curved. For example, when viewed from the vertical direction, the shape of the protrusion 21e is arc-shaped, and the radius of curvature of the protrusion 21e is approximately equal to the radius of curvature of the blade body 21d. The outer shape of the protrusion 21e is smaller than the outer shape of the blade body 21d. The upper surface of the protrusion 21e becomes a plane orthogonal to the vertical direction. Therefore, the height of the protrusion 21e (the height relative to the upper surface of the blade body 21d) gradually decreases as it approaches the inner circumferential side of the impeller 2.

[0047] The circumferential width of the protrusion 21e is slightly narrower than the circumferential width of the blade body 21d. In the radial direction, the inner end of the protrusion 21e is disposed at a position outside the inner end face of the blade body 21d. In the radial direction, the outer end face of the protrusion 21e is disposed at a position inside the outer end face of the blade body 21d. The protrusion 21e is disposed in a groove portion 22d (described later) formed in the second blade member 22.

[0048] As described above, the second blade member 22 is fixed by welding such as ultrasonic welding to the first blade member 21. Specifically, the second blade member 22 is fixed by welding such as ultrasonic welding to the ten blades 21a. In the first blade member 21 before the second blade member 22 is welded and fixed, a welding protrusion, that is, a welding protrusion 21f (refer to Figure 3 ) for welding and fixing the second blade member 22 to the first blade member 21 is formed on the upper surface of the protrusion 21e. Figure 3 The state of the first blade member 21 before the second blade member 22 is welded and fixed is shown. Figure 4 The state of the first blade member 21 after the second blade member 22 is welded and fixed is shown.

[0049] The welding protrusion 21f is formed along the protrusion 21e. For example, when viewed from the vertical direction, the shape of the welding protrusion 21f is arc-shaped, and the radius of curvature of the welding protrusion 21f is approximately equal to the radius of curvature of the protrusion 21e. The circumferential width of the welding protrusion 21f is narrower than the circumferential width of the protrusion 21e. In the radial direction, the inner end face of the welding protrusion 21f is disposed at a position outside the inner end of the protrusion 21e. In the radial direction, the outer end face of the welding protrusion 21f is disposed at a position inside the outer end of the protrusion 21e. In the circumferential direction, the welding protrusion 21f is formed at the center portion of the protrusion 21e.

[0050] When the second vane member 22 is fixed to the ten vanes 21a by welding, the welding protrusion 21f melts. In the first vane member 21 after the second vane member 22 is fixed by welding, a welding protrusion trace 21g is formed on the upper surface of the protrusion 21e (see Figure 4 ). The welding protrusion trace 21g is the root of the welding protrusion 21f that melted when the second vane member 22 was fixed by welding to the ten vanes 21a. That is, a welding protrusion trace 21g is formed on the upper side of the vanes 21a. The welding protrusion trace 21g is formed along the protrusion 21e. For example, when viewed from the up-down direction, the shape of the welding protrusion trace 21g is circular arc-shaped, and the radius of curvature of the welding protrusion trace 21g is substantially equal to the radius of curvature of the protrusion 21e.

[0051] As described above, in the radial direction, the inner end face of the welding protrusion 21f is disposed at a position outside the inner end of the protrusion 21e, and the outer end face of the welding protrusion 21f is disposed at a position inside the outer end of the protrusion 21e. Therefore, in the radial direction, the inner end of the welding protrusion trace 21g is disposed at a position outside the inner end of the protrusion 21e, and the outer end of the welding protrusion trace 21g is disposed at a position inside the outer end of the protrusion 21e. The width of the welding protrusion trace 21g (specifically, the width of the welding protrusion trace 21g in the circumferential direction) becomes narrower as it goes from the outer peripheral side to the inner peripheral side of the impeller 2 (see Figure 5 ).

[0052] The positioning protrusion 21c is formed on the upper surface of the vane 21a and protrudes upward from the upper surface of the vane 21a. Specifically, the positioning protrusion 21c is formed on the upper surface of the vane body 21d and protrudes upward from the upper surface of the vane body 21d. The positioning protrusion 21c is formed on each of the ten vanes 21a. The positioning protrusion 21c is formed at the outer end portion in the radial direction of the vane 21a and is disposed at a position outside the protrusion 21e in the radial direction. The radially outer surface of the positioning protrusion 21c is connected to the radially outer surface of the vane body 21d and constitutes a part of the outer peripheral surface of the first vane member 21.

[0053] The radially inner surface of the positioning protrusion 21c becomes a positioning surface 21h for positioning the second vane member 22 relative to the first vane member 21 in the radial direction. The positioning surface 21h is a concave curved surface that is recessed toward the radially outer side. When viewed from the up-down direction, the shape of the positioning surface 21h is circular arc-shaped with the axis of the impeller 2 as the center of curvature. When viewed from the up-down direction, the radius of curvature of all ten positioning surfaces 21h is equal. In addition, in the present embodiment, since the radius of curvature of the positioning surface 21h when viewed from the up-down direction is relatively large, the shape of the positioning surface 21h when viewed from the up-down direction is substantially linear.

[0054] As described above, the positioning protrusion 21c is arranged radially outside the protruding portion 21e. The positioning surface 21h is connected to the upper surface of the protruding portion 21e. The positioning surface 21h is arranged radially outside the welding protrusion mark 21g while being spaced apart from the radially outer end of the welding protrusion mark 21g. The shape of the positioning protrusion 21c when viewed from the vertical direction is a polygon. Specifically, the shape of the positioning protrusion 21c when viewed from the vertical direction is a quadrilateral.

[0055] The upper surface of the positioning protrusion 21c becomes a plane orthogonal to the vertical direction. When viewed from the vertical direction, the width W1 (see Figure 4 ) of the positioning protrusion 21c in the forming direction of the blade 21a is wider than the width W2 (see Figure 4 ) of the positioning protrusion 21c in the circumferential direction. The width W2 of the positioning protrusion 21c in the circumferential direction is wider than the width of the protruding portion 21e in the circumferential direction. That is, the width W2 of the positioning protrusion 21c is wider than the width of the welding protrusion mark 21g in the circumferential direction.

[0056] In addition, the width W2 of the positioning protrusion 21c is equal to the width of the blade body 21d in the circumferential direction. That is, the width W2 of the positioning protrusion 21c is equal to the width of the blade 21a in the circumferential direction. One surface of the positioning protrusion 21c in the circumferential direction is arranged on the same surface as one surface of the blade body 21d in the circumferential direction, and the other surface of the positioning protrusion 21c in the circumferential direction is arranged on the same surface as the other surface of the blade body 21d in the circumferential direction. As Figure 3 shown, the height (height in the vertical direction) of the positioning protrusion 21c is higher than the height (height in the vertical direction) of the protruding portion 21e, and the upper surface of the positioning protrusion 21c is arranged at a position above the upper surface of the protruding portion 21e.

[0057] The second blade member 22 includes a main body portion 22a formed in an annular shape and a cylindrical upper end portion 22b protruding upward from the central portion of the main body portion 22a (see Figure 2 ). The central portion of the second blade member 22 forms a through hole 22c through which the fluid inhaled from the suction portion 8a passes. The outer diameter of the main body portion 22a is substantially equal to the outer diameter of the first blade member 21. That is, the outer diameter of the second blade member 22 is substantially equal to the outer diameter of the first blade member 21.

[0058] The upper surface of the main body portion 22a becomes a plane orthogonal to the vertical direction. The lower surface of the main body portion 22a becomes an inclined surface that is inclined upward as it approaches the inner peripheral side of the impeller 2. That is, the lower surface of the second blade member 22 becomes an inclined surface that is inclined upward as it approaches the inner peripheral side of the impeller 2. A groove portion 22d into which the protruding portion 21e enters is formed on the lower surface of the second blade member 22. That is, ten groove portions 22d are formed on the lower surface of the second blade member 22.

[0059] The groove portion 22d is recessed upward. The shape of the groove portion 22d becomes a shape corresponding to the shape of the protruding portion 21e, and the shape of the groove portion 22d when viewed from the vertical direction is curved. The width of the groove portion 22d in the circumferential direction is slightly wider than the width of the protruding portion 21e in the circumferential direction. The upper surface of the groove portion 22d becomes a plane orthogonal to the vertical direction. As described above, since the lower surface of the main body portion 22a becomes an inclined surface that is inclined upward as it approaches the inner peripheral side of the impeller 2, the depth of the groove portion 22d (the depth with respect to the lower surface of the main body portion 22a) becomes shallower as it approaches the inner peripheral side of the impeller 2.

[0060] A positioning recess 22e with which the positioning projection 21c engages is formed on the main body portion 22a. That is, a positioning recess 22e is formed on the second blade member 22. In addition, ten positioning recesses 22e are formed on the second blade member 22. The positioning recess 22e penetrates the second blade member 22 in the vertical direction. In addition, the positioning recess 22e is formed from the outer peripheral surface of the second blade member 22 toward the inner peripheral side of the second blade member 22. That is, the positioning recess 22e of the present embodiment is a cutout. The positioning recess 22e is arranged radially outside the groove portion 22d. The positioning recess 22e is connected to the radially outer end of the groove portion 22d. The shape of the positioning recess 22e is a shape corresponding to the shape of the positioning projection 21c.

[0061] The radially inner surface of the positioning recess 22e becomes an abutting surface 22f against which the positioning surface 21h abuts. That is, an abutting surface 22f is formed on the positioning recess 22e. The shape of the abutting surface 22f is a shape against which the positioning surface 21h can abut. That is, the abutting surface 22f becomes a convex curved surface that bulges toward the radially outer side. The shape of the abutting surface 22f when viewed from the vertical direction is an arc shape with the axis of the impeller 2 as the center of curvature. In addition, when viewed from the vertical direction, the radius of curvature of the abutting surface 22f is equal to the radius of curvature of the positioning surface 21h. In the present embodiment, the second blade member 22 is positioned radially with respect to the first blade member 21 by the positioning surface 21h and the abutting surface 22f.

[0062] The second vane member 22 is fixed to the upper surface side of the ten vanes 21a. Specifically, the groove portion 22d is joined and fixed to the protruding portion 21e that enters the groove portion 22d by welding such as ultrasonic welding. Resin that melts when the groove portion 22d is welded to the protruding portion 21e accumulates in the groove portion 22d. That is, resin after melting of the welding protrusion 21f accumulates in the groove portion 22d.

[0063] (Manufacturing method of pump device) Figure 8 is a cross-sectional view for explaining Figure 3 the cross-sectional shape of the welding protrusion 21f shown.

[0064] The manufacturing method of the pump device 1 includes a welding and fixing process of welding and fixing the second vane member 22 to the ten vanes 21a. On the upper surface of the protruding portion 21e before the welding and fixing process, as described above, the welding protrusion 21f is formed. As described above, the upper surface of the protruding portion 21e becomes a plane orthogonal to the vertical direction. The height (vertical direction height) of the welding protrusion 21f is constant, and the upper end of the welding protrusion 21f is arranged at a constant position in the vertical direction.

[0065] The upper end of the welding protrusion 21f is arranged at a position lower than the upper surface of the positioning protrusion 21c. That is, the upper end of the positioning protrusion 21c is arranged at a position higher than the upper end of the welding protrusion 21f. When the direction orthogonal to the forming direction of the vane 21a when viewed from the vertical direction (specifically, the forming direction of the vane 21a formed from the outer peripheral surface of the first vane member 21 toward the inner peripheral side) is set as the "orthogonal direction", as Figure 8 shown, the cross-sectional shape of the welding protrusion 21f in the orthogonal direction becomes a triangle whose width gradually narrows toward the upper side.

[0066] The angle θ (refer to Figure 8 ) formed by the two hypotenuse sides of the welding protrusion 21f when viewed from the orthogonal direction gradually becomes smaller toward the inner peripheral side of the impeller 2, and the width of the lower side of the welding protrusion 21f gradually narrows toward the inner peripheral side of the impeller 2. For example, at the outer peripheral side end of the welding protrusion 21f, the angle θ is 60°, and at the inner peripheral side end of the welding protrusion 21f, the angle θ is 30°. Therefore, as described above, in the first vane member 21 after fixing the second vane member 22, the width of the welding protrusion trace 21g gradually narrows from the outer peripheral side toward the inner peripheral side of the impeller 2.

[0067] In the welding and fixing process, first, the protruding portion 21e and the welding protrusion 21f are arranged in the groove portion 22d. When the welding protrusion 21f is arranged in the groove portion 22d, the upper end of the welding protrusion 21f contacts the upper surface of the groove portion 22d. Further, in the welding and fixing process, ultrasonic welding is performed in this state to melt the welding protrusion 21f. As described above, the resin after melting the welding protrusion 21f accumulates in the groove portion 22d. The groove portion 22d functions to prevent the resin that has melted and solidified during welding from adhering to the lower surface of the second vane member 22 or the like.

[0068] (Main effects of this embodiment) As described above, in this embodiment, the first vane member 21 includes the positioning protrusion 21c for positioning the second vane member 22 relative to the first vane member 21 in the circumferential and radial directions, and the inner surface of the positioning protrusion 21c in the radial direction serves as the positioning surface 21h for positioning the second vane member 22 relative to the first vane member 21 in the radial direction. Further, in this embodiment, the positioning surface 21h is a concave curved surface that is recessed toward the outer side in the radial direction, and the shape of the positioning surface 21h when viewed from the vertical direction is an arc shape with the axis of the impeller 2 as the center of curvature.

[0069] Therefore, in this embodiment, the dimensional tolerance of the positioning surface 21h relative to the axis of the impeller 2 can be directly specified. Therefore, in this embodiment, compared with the pump device described in the above Patent Document 1, the deviation of the positioning surface 21h relative to the axis of the impeller 2 can be suppressed. That is, in this embodiment, compared with the prior art, the deviation of the positioning surface 21h relative to the axis of the impeller 2 can be suppressed. As a result, in this embodiment, compared with the prior art, the relative position accuracy of the first vane member 21 and the second vane member 22 in the radial direction can be improved.

[0070] In this embodiment, the outer surface of the positioning protrusion 21c in the radial direction constitutes a part of the outer peripheral surface of the first vane member 21. That is, in this embodiment, the positioning protrusion 21c is formed at the end portion on the outer peripheral side of the first vane member 21. Therefore, in this embodiment, the relative position accuracy of the first vane member 21 and the second vane member 22 in the circumferential direction can be improved.

[0071] In the present embodiment, the positioning surface 21h is arranged on the radially outer side of the welding protrusion mark 21g with a gap between the outer end in the radial direction of the welding protrusion mark 21g. That is, in the present embodiment, the positioning surface 21h is arranged at a position radially outside the welding protrusion 21f with a gap between the outer end in the radial direction of the welding protrusion 21f. Therefore, in the present embodiment, compared with the case where the welding protrusion 21f and the positioning surface 21h are connected in the radial direction, the area of the positioning surface 21h can be enlarged. Therefore, in the present embodiment, the first blade member 21 and the second blade member 22 can be positioned with higher precision in the radial direction. In addition, in the present embodiment, the second blade member 22 can also be welded and fixed to the blade 21a between the welding protrusion mark 21g and the positioning surface 21h.

[0072] In the present embodiment, when viewed from the up-down direction, the radius of curvature of all ten positioning surfaces 21h is equal. Therefore, in the present embodiment, compared with the case where the positioning surfaces 21h having different radii of curvature are included among the ten positioning surfaces 21h when viewed from the up-down direction, the shape of the first blade member 21 can be simplified.

[0073] In the present embodiment, the width W1 of the positioning protrusion 21c in the forming direction of the blade 21a is wider than the width W2 of the positioning protrusion 21c in the circumferential direction when viewed from the up-down direction. Therefore, in the present embodiment, the strength of the positioning protrusion 21c can be improved. In addition, in the present embodiment, the width W2 of the positioning protrusion 21c in the circumferential direction is wider than the width of the welding protrusion mark 21g in the circumferential direction and is equal to the width of the blade 21a in the circumferential direction, and the width W2 of the positioning protrusion 21c can be widened, so the strength of the positioning protrusion 21c can be improved.

[0074] In addition, in the present embodiment, the positioning recess 22e penetrates the second blade member 22 in the up-down direction, and the height of the positioning protrusion 21c can be increased, so the strength of the positioning protrusion 21c can be improved. Therefore, in the present embodiment, damage to the positioning protrusion 21c during the positioning of the first blade member 21 and the second blade member 22 in a state where the positioning protrusion 21c is engaged with the positioning recess 22e can be prevented.

[0075] In the present embodiment, the upper end of the positioning protrusion 21c is disposed at a position above the upper end of the welding protrusion 21f. Therefore, in the present embodiment, in the welding and fixing process, before the upper end of the welding protrusion 21f comes into contact with the upper surface of the groove portion 22d, the positioning protrusion 21c is engaged with the positioning recess 22e, so that the second vane member 22 can be positioned relative to the first vane member 21 in the circumferential and radial directions by the positioning protrusion 21c and the positioning recess 22e. That is, in the present embodiment, in a state where the upper end of the welding protrusion 21f does not contact the upper surface of the groove portion 22d, the second vane member 22 can be positioned relative to the first vane member 21 by the positioning protrusion 21c and the positioning recess 22e. Therefore, in the present embodiment, damage to the welding protrusion 21f can be prevented when the second vane member 22 is positioned relative to the first vane member 21 by the positioning protrusion 21c and the positioning recess 22e.

[0076] In the present embodiment, the height of the welding protrusion 21f in the vertical direction is constant. In addition, in the present embodiment, the cross-sectional shape of the welding protrusion 21f in the orthogonal direction is a triangle whose width gradually narrows upward. Further, in the present embodiment, the angle θ formed by the two hypotenuses of the welding protrusion 21f when viewed in the orthogonal direction gradually decreases toward the inner peripheral side of the impeller 2, and the width of the lower side of the welding protrusion 21f gradually narrows toward the inner peripheral side of the impeller 2. That is, in the present embodiment, the volume of the welding protrusion 21f decreases from the outer peripheral side toward the inner peripheral side of the impeller 2. Therefore, in the present embodiment, even if the depth of the groove portion 22d becomes shallower toward the inner peripheral side of the impeller 2, it is possible to suppress the molten portion of the welding protrusion 21f from overflowing from the groove portion 22d.

[0077] (Other embodiments) The above-described embodiment is an example of a preferred embodiment of the present invention, but is not limited thereto, and various modifications can be made without departing from the gist of the present invention.

[0078] In the above-described embodiment, the positioning recess 22e may not penetrate the second vane member 22 in the vertical direction. In this case, the positioning recess 22e is recessed upward from the lower surface of the second vane member 22. The amount of depression of the positioning recess 22e is larger than the amount of depression of the groove portion 22d, and the upper surface of the positioning recess 22e is disposed at a position above the upper surface of the groove portion 22d. In addition, in the above-described embodiment, when viewed from the vertical direction, the positioning surfaces 21h having different radii of curvature may be included in the ten positioning surfaces 21h.

[0079] In the above-described embodiment, the positioning surface 21h may also be a flat surface. In this case, the abutting surface 22f is a flat surface. Further, in this case, for example, when viewed from the up-down direction, the perpendicular bisector of the positioning surface 21h passes through the axis of the impeller 2. That is, the perpendicular bisector of the positioning surface 21h, which is linear when viewed from the up-down direction, passes through the axis of the impeller 2. Further, for example, the distances of each of the ten positioning surfaces 21h from the axis of the impeller 2 are equal to each other. Further, among the ten positioning surfaces 21h, there may be included a positioning surface 21h having a different distance from the axis of the impeller 2. Further, when viewed from the up-down direction, the perpendicular bisector of the positioning surface 21h may not pass through the axis of the impeller 2.

[0080] In the above-described embodiment, the width W2 of the positioning projection 21c in the circumferential direction may also be narrower than the width of the blade body 21d in the circumferential direction. In this case, the width W2 of the positioning projection 21c may be equal to the width of the protruding portion 21e in the circumferential direction. Further, in the above-described embodiment, when viewed from the up-down direction, the width W1 of the positioning projection 21c in the forming direction of the blade 21a may be equal to the width W2 of the positioning projection 21c, or the width W1 may be narrower than the width W2. Further, in the above-described embodiment, the shape of the positioning projection 21c when viewed from the up-down direction may also be a polygon other than a quadrilateral such as a triangle.

[0081] In the above-described embodiment, a gap may not be formed between the outer end of the welding projection trace 21g in the radial direction and the positioning surface 21h. Further, in the above-described embodiment, the width of the welding projection trace 21g may also be constant. That is, the angle θ formed by the two hypotenuses of the welding projection 21f when viewed from the orthogonal direction may also be constant. Further, in the above-described embodiment, the cross-sectional shape of the welding projection 21f in the orthogonal direction may also be a trapezoid whose width gradually narrows as it goes upward. For example, the cross-sectional shape of the welding projection 21f in the orthogonal direction may also be an isosceles trapezoid shape. In this case, for example, the angle θ formed by the two hypotenuses of the welding projection 21f when viewed from the orthogonal direction gradually decreases as it goes toward the inner peripheral side of the impeller 2.

[0082] In the above-described embodiment, the positioning protrusions 21c only need to be formed at least at three locations. That is, the positioning protrusions 21c only need to be formed on at least three blades 21a. Additionally, in the above-described embodiment, the first blade member 21 may also be formed separately from the magnet holding member 15. Moreover, in the above-described embodiment, the upper surface of the blade body 21d and the lower surface of the main body portion 22a may also be planes orthogonal to the vertical direction. Additionally, in the above-described embodiment, the shape of the blade 21a when viewed from the vertical direction may also be linear. For example, ten blades 21a may be formed radially. Additionally, in the above-described embodiment, the number of blades 21a included in the first blade member 21 only needs to be three or more, may be nine or less, or may be eleven or more.

[0083] (Configuration of the present technology) Note that the present technology may adopt the following configuration. (1) A pump device, comprising: a motor having a rotor and a stator; and an impeller that rotates together with the rotor, The impeller includes: a resin-made first blade member having a plurality of three or more blades arranged at constant intervals in the circumferential direction of the rotor; and a resin-made second blade member that is formed separately from the first blade member and is fixed to the first blade member, The axis of the impeller coincides with the axis of the rotor, One side in the axial direction of the rotor is set as the first direction side, and the opposite side of the first direction side is set as the second direction side, The second blade member is disposed on the first direction side of the first blade member, The first blade member includes: a base portion connected to the ends of the plurality of blades on the second direction side; and three or more positioning protrusions for positioning the second blade member relative to the first blade member in the circumferential direction and the radial direction of the rotor, The positioning protrusions are formed on the surfaces of three or more of the blades on the first direction side and protrude toward the first direction side from the blades, A positioning recess for engaging with the positioning protrusions is formed on the second blade member, The inner surface of the positioning protrusion in the radial direction of the rotor serves as a positioning surface for positioning the second blade member relative to the first blade member in the radial direction of the rotor, The positioning surface is a concave curved surface or a plane that is recessed toward the outer side in the radial direction of the rotor, When the positioning surface is a concave curved surface, the shape of the positioning surface when viewed from the axial direction of the rotor is an arc shape with the axis of the impeller as the center of curvature, An abutting surface that abuts against the positioning surface is formed in the positioning recess. (2) In the pump device according to (1), The positioning surface is a concave curved surface, When viewed from the axial direction of the rotor, the radius of curvature of all of the plurality of positioning surfaces is equal. (3) In the pump device according to (1), The positioning surface is a flat surface, When viewed from the axial direction of the rotor, the perpendicular bisector of the positioning surface passes through the axis of the impeller. (4) In the pump device according to any one of (1) to (3), The surface on the outer side in the radial direction of the rotor of the positioning projection constitutes a part of the outer peripheral surface of the first blade member. (5) In the pump device according to any one of (1) to (4), A welding projection trace is formed on the first direction side of the blade, and the welding projection trace is the root of the projection for welding that is melted when the second blade member is welded and fixed to the plurality of blades. The positioning surface is arranged at a position outside the welding projection trace in the radial direction of the rotor in a state of being spaced apart from the outer end in the radial direction of the rotor of the welding projection trace. (6) In the pump device according to any one of (1) to (5), A welding projection trace is formed on the first direction side of the blade, and the welding projection trace is the root of the projection for welding that is melted when the second blade member is welded and fixed to the plurality of blades. The positioning surface is arranged at a position outside the welding projection trace in the radial direction of the rotor. The width of the positioning projection in the circumferential direction of the rotor is wider than the width of the welding projection trace in the circumferential direction of the rotor. (7) In the pump device according to any one of (1) to (6), When viewed from the axial direction of the rotor, the width of the positioning projection in the formation direction of the blade is wider than the width of the positioning projection in the circumferential direction of the rotor. (8) In the pump device according to any one of (1) to (7), The width of the positioning projection in the circumferential direction of the rotor is equal to the width of the blade in the circumferential direction of the rotor. (9) In the pump device according to any one of (1) to (8), When viewed from the axial direction of the rotor, the shape of the positioning projection is a polygon. (10) In the pump device according to any one of (1) to (9), The blade includes: a blade body connected to the base; and a protrusion formed along the blade body on the surface of the blade body on the first direction side and protruding from the blade body toward the first direction side. A groove portion that is recessed toward the first direction side and into which the protrusion enters is formed on the surface of the second blade member on the second direction side. The positioning protrusion is disposed at a position radially outside the protrusion on the rotor, is formed on the surface of the blade body on the first direction side, and protrudes from the blade body toward the first direction side. The height of the positioning protrusion in the axial direction of the rotor is higher than the height of the protrusion in the axial direction of the rotor. (11) In the pump device according to any one of (1) to (10), The positioning recess penetrates the second blade member in the axial direction of the rotor. (12) In the pump device according to any one of (1) to (11), The blade includes: a blade body connected to the base; and a protrusion formed along the blade body on the surface of the blade body on the first direction side and protruding from the blade body toward the first direction side. The surface of the blade body on the first direction side is an inclined surface that is inclined so as to face the first direction side as it approaches the inner peripheral side of the impeller. The surface of the protrusion on the first direction side is a plane orthogonal to the axial direction of the rotor. The surface of the second blade member on the second direction side is an inclined surface that is inclined so as to face the first direction side as it approaches the inner peripheral side of the impeller. A groove portion that is recessed toward the first direction side and into which the protrusion enters is formed on the surface of the second blade member on the second direction side. The surface of the groove portion on the first direction side is a plane orthogonal to the axial direction of the rotor, and the depth of the groove portion becomes shallower as it approaches the inner peripheral side of the impeller. On the surface of the protrusion on the first direction side, a welding protrusion trace is formed along the protrusion. The welding protrusion trace is the root of a protrusion for welding that is melted when the second blade member is welded and fixed to a plurality of the blades. The width of the welding protrusion trace becomes narrower as it goes from the outer peripheral side to the inner peripheral side of the impeller. (13) In the manufacturing method of the pump device according to (12), There is a welding and fixing process for welding and fixing the second blade component to multiple blades. On the surface of the first direction side of the protruding portion before the welding and fixing process, a welding protrusion serving as the protrusion for welding is formed. The height of the welding protrusion in the axial direction of the rotor is constant. The cross-sectional shape of the welding protrusion in the orthogonal direction, which is the direction orthogonal to the formation direction of the blade when observed from the axial direction of the rotor, is a triangle or trapezoid whose width gradually narrows towards the first direction side. When observed from the orthogonal direction, the angle formed by the two hypotenuses of the welding protrusion gradually decreases towards the inner circumferential side of the impeller, and the width of the second direction side of the welding protrusion gradually narrows towards the inner circumferential side of the impeller. In the welding and fixing process, with the protruding portion and the welding protrusion arranged in the groove portion, the welding protrusion is melted. (14) In the manufacturing method of the pump device described in (13), The first direction side end of the positioning protrusion is arranged at a position on the first direction side closer to the first direction side than the first direction side end of the welding protrusion. Symbol Explanation

[0084] 1 Pump device 2 Impeller 3 Motor 5 Rotor 6 Stator 21 First blade component 21a Blade 21b Base 21c Positioning protrusion 21d Blade body 21e Protruding portion 21f Welding protrusion 21g Welding protrusion trace 21h Positioning surface 22 Second blade component 22d Groove portion 22e Positioning recess 22f Contact surface W1 Width of the positioning protrusion in the blade formation direction when observed from the axial direction of the rotor W2 Width of the positioning protrusion in the circumferential direction of the rotor Z1 First direction side Z2 Second direction side θ Angle formed by the two hypotenuses of the welding protrusion when observed from the orthogonal direction.

Claims

1. A pump device, characterized in that: The invention comprises: a motor having a rotor and a stator; and an impeller rotating together with the rotor, The impeller comprises: a first blade member made of resin, which has a plurality of blades of three or more arranged at a constant pitch in the circumferential direction of the rotor; and a second blade member made of resin, which is formed separately from the first blade member and fixed to the first blade member. The axis of the impeller is consistent with the axis of the rotor. One side of the rotor in the axial direction is defined as a first direction side, and the side opposite to the first direction side is defined as a second direction side. The second blade member is arranged on the first direction side of the first blade member, The first blade member comprises: a base portion connected to the ends of the plurality of blades on the second direction side; and three or more positioning protrusions for positioning the second blade member relative to the first blade member in the circumferential direction of the rotor and in the radial direction of the rotor. The positioning protrusion is formed on the surfaces of three or more blades on the first direction side and protrudes from the blades toward the first direction side. A positioning recess engaged with the positioning protrusion is formed on the second blade member. The inner surface of the positioning protrusion in the radial direction of the rotor serves as a positioning surface for positioning the second blade member relative to the first blade member in the radial direction of the rotor. The positioning surface is a concave curved surface or a flat surface that is recessed toward the radial outer side of the rotor. When the positioning surface is a concave curved surface, the shape of the positioning surface when viewed from the axial direction of the rotor is an arc shape with the axis of the impeller as the center of curvature. The positioning recess has a contact surface formed therein that contacts the positioning surface.

2. The pump device according to claim 1, characterized in that The positioning surface is a concave surface, When viewed from the axial direction of the rotor, all of the plurality of positioning surfaces have the same curvature radius.

3. The pump device according to claim 1, characterized in that The positioning surface is a plane, When observing from the axial direction of the rotor, a perpendicular bisector of the positioning surface passes through the axis of the impeller.

4. The pump device according to any one of claims 1 to 3, characterized in that An outer surface of the positioning protrusion in the radial direction of the rotor constitutes a part of the outer peripheral surface of the first blade member.

5. The pump device according to any one of claims 1 to 3, characterized in that A welding protrusion mark is formed on the first direction side of the blade, the welding protrusion mark being a root of a welding protrusion that melts when the second blade member is welded and fixed to the plurality of blades. The positioning surface is disposed outside the welding protrusion mark in the radial direction of the rotor with a gap therebetween from an outer end of the welding protrusion mark in the radial direction of the rotor.

6. The pump device according to any one of claims 1 to 3, characterized in that A welding protrusion mark is formed on the first direction side of the blade, the welding protrusion mark being a root of a welding protrusion that melts when the second blade member is welded and fixed to the plurality of blades. The positioning surface is arranged at a position outside the welding protrusion mark in the radial direction of the rotor. The width of the positioning protrusion in the circumferential direction of the rotor is wider than the width of the welding protrusion mark in the circumferential direction of the rotor.

7. The pump device according to any one of claims 1 to 3, characterized in that The width of the positioning protrusion in the direction in which the blade is formed when viewed from the axial direction of the rotor is wider than the width of the positioning protrusion in the circumferential direction of the rotor.

8. The pump device according to any one of claims 1 to 3, characterized in that The width of the positioning protrusion in the circumferential direction of the rotor is equal to the width of the blade in the circumferential direction of the rotor.

9. The pump device according to any one of claims 1 to 3, characterized in that The positioning protrusion has a polygonal shape when viewed from the axial direction of the rotor.

10. The pump device according to any one of claims 1 to 3, characterized in that The blade includes: a blade body connected to the base; and a protrusion formed along the blade body on a surface of the blade body on the first direction side and protruding from the blade body to the first direction side. A groove is formed on the surface of the second blade member on the second direction side. The groove is recessed toward the first direction side and the protrusion enters the groove. The positioning protrusion is arranged at an outer side than the protrusion in the radial direction of the rotor, is formed on the surface of the blade body on the first direction side, and protrudes from the blade body to the first direction side. The height of the positioning protrusion in the axial direction of the rotor is higher than the height of the protrusion in the axial direction of the rotor.

11. The pump device according to any one of claims 1 to 3, characterized in that The positioning recess penetrates the second blade member in the axial direction of the rotor.

12. The pump device according to any one of claims 1 to 3, characterized in that The blade includes: a blade body connected to the base; and a protrusion formed along the blade body on a surface of the blade body on the first direction side and protruding from the blade body to the first direction side. The surface of the blade body on the first direction side is an inclined surface that is inclined toward the first direction side as it goes toward the inner peripheral side of the impeller. The surface of the protrusion on the first direction side is a plane orthogonal to the axial direction of the rotor. The surface of the second blade member on the second direction side is an inclined surface that is inclined toward the first direction side as it goes toward the inner peripheral side of the impeller. A groove is formed on the surface of the second blade member on the second direction side. The groove is recessed toward the first direction side and the protrusion enters the groove. The surface of the groove portion on the first direction side is a plane orthogonal to the axial direction of the rotor, and the depth of the groove portion becomes shallower toward the inner circumference of the impeller. On the surface of the protrusion on the first direction side, a welding protrusion mark is formed along the protrusion, the welding protrusion mark being the root of the welding protrusion melted when the second blade member is welded and fixed to the plurality of blades. The width of the welding protrusion mark becomes narrower from the outer peripheral side toward the inner peripheral side of the impeller.

13. A method for manufacturing a pump device, which is the method for manufacturing a pump device according to claim 12, characterized in that: A welding and fixing step is provided to weld and fix the second blade member to the plurality of blades, A welding protrusion serving as the welding protrusion is formed on the surface of the protruding portion on the first direction side before the welding and fixing step. The welding protrusion has a constant height in the axial direction of the rotor. The cross-sectional shape of the welding protrusion in the direction perpendicular to the formation direction of the blade when viewed from the axial direction of the rotor, that is, the orthogonal direction, is a triangle or a trapezoid whose width gradually narrows toward the first direction side. The angle formed by the two oblique sides of the welding protrusion when viewed from the orthogonal direction gradually decreases toward the inner peripheral side of the impeller, and the width of the welding protrusion on the second direction side gradually narrows toward the inner peripheral side of the impeller. In the welding and fixing step, the welding protrusion is melted in a state where the protruding portion and the welding protrusion are arranged in the groove portion.

14. The method for manufacturing a pump device according to claim 13, characterized in that: The first direction side end of the positioning protrusion is arranged closer to the first direction side than the first direction side end of the welding protrusion.

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