Pumping device

Abstract

To provide a pump device that allows for easy positioning of the blade members. [Solution] In this pump device, the impeller 3 comprises a first blade member 21 having a plurality of blades 21b, and a second blade member 22 formed separately and fixed to the first blade member 21. The first blade member 21 has a plurality of positioning protrusions 21d formed thereon for positioning the second blade member 22 relative to the first blade member 21 in a direction perpendicular to the axial direction of the rotor. A recess-side positioning surface 22g is formed on the side surface of the positioning recess 22f formed in the second blade member 22, which the side surface of the positioning protrusion 21d contacts, and the portion of the side surface of the positioning protrusion 21d that contacts the recess-side positioning surface 22g is the protrusion-side positioning surface 21g. When viewed from the axial direction of the rotor, a gap is formed between the portion of the side surface of the positioning recess 22f excluding the recess-side positioning surface 22g and the portion of the side surface of the positioning protrusion 21d excluding the protrusion-side positioning surface 21g.

Description

Technical Field

[0001] The present invention relates to a pump device.

Background Art

[0002] Conventionally, a pump device is known that includes a resin impeller disposed in a pump chamber and a motor that rotationally drives the impeller (see, for example, 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 formed integrally with the plurality of blades, and a cover portion (impeller cover) formed separately from the blades and the base portion. The blades and the base portion of the impeller are formed integrally 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. Cylindrical positioning pins for positioning the cover portion with respect to the blades and the base portion in a direction orthogonal to the axial direction of the rotor are formed on the end faces of the plurality of blades. The plurality of positioning pins are arranged, for example, on a virtual circle having the axis of the impeller as the center of curvature when viewed from the axial direction of the rotor. A plurality of engagement holes into which the positioning pins engage are formed in the cover portion. In the pump device described in Patent Document 1, the cover portion is positioned with respect to the blades and the base portion in a direction orthogonal to the axial direction of the rotor by the positioning pins and the engagement holes.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

[0005] The present inventor has developed a pump device comprising an impeller located in a pump chamber and a motor for rotating the impeller. In the pump device under development, the impeller comprises a first blade member and a second blade member formed separately from the first blade member. Similar to the impeller described in Patent Document 1, the first blade member comprises a plurality of blades arranged at a constant pitch in the circumferential direction of the rotor and a base portion to which the base ends of the plurality of blades are connected. The second blade member is fixed to one end face of the plurality of blades in the axial direction of the rotor.

[0006] In the pump device currently under development, similar to the pump device described in Patent Document 1, it is possible to position the second blade member relative to the first blade member in a direction perpendicular to the axial direction of the rotor by forming positioning pins on the end faces of multiple blades of the first blade member and forming engagement holes in the second blade member for the positioning pins to engage with. In this case, the multiple positioning pins and multiple engagement holes are arranged on a virtual circle with the axis of the impeller as the center of curvature when viewed from the axial direction of the rotor.

[0007] However, in this case, unless multiple positioning pins are accurately formed on the first blade member and multiple engagement holes are accurately formed on the second blade member, it becomes difficult to engage each of the multiple positioning pins with each of the multiple engagement holes during impeller assembly. In other words, in this case, unless the dimensional accuracy of the first and second blade members is improved, it becomes difficult to easily position the second blade member relative to the first blade member in a direction perpendicular to the axial direction of the rotor during impeller assembly.

[0008] Therefore, the object of the present invention is to provide a pump device comprising an impeller having a first blade member on which a plurality of blades are formed and a second blade member formed separately from the first blade member and fixed to the first blade member, and a motor for rotating the impeller, in which, even if the dimensional accuracy of the first blade member and the second blade member is relatively low, the second blade member can be easily positioned relative to the first blade member in a direction perpendicular to the axial direction of the rotor when assembling the impeller. [Means for solving the problem]

[0009] To solve the above problems, a pump device according to one aspect of the present invention comprises a motor having a rotor and a stator, and an impeller that rotates together with the rotor, wherein the impeller comprises a first blade member having a plurality of blades arranged at a constant pitch in the circumferential direction of the rotor, and a second blade member formed separately from the first blade member and fixed to the first blade member, wherein the axis of the impeller coincides with the axis of the rotor, and if one side in the axial direction of the rotor is designated as the first direction side and the opposite side of the first direction side as the second direction side, the second blade member is positioned on the first direction side of the first blade member, and the first blade member comprises a base to which the ends of the plurality of blades on the second direction side are connected, and a plurality of positioning protrusions for positioning the second blade member relative to the first blade member in a direction perpendicular to the axial direction of the rotor. The positioning projection is formed on the surface of the blade facing the first direction and protrudes from the blade in the first direction direction, and a positioning recess is formed on the surface of the second blade member facing the second direction direction, recessing toward the first direction direction and engaging with the positioning projection, and a recess-side positioning surface is formed on the side surface of the positioning recess, with contact between the side surface of the positioning projection and the recess-side positioning surface, and the portion of the side surface of the positioning projection that contacts the recess-side positioning surface is the projection-side positioning surface, and when viewed from the axial direction of the rotor, the recess-side positioning surface and the projection-side positioning surface are inclined with respect to the circumferential direction of the rotor, and when viewed from the axial direction of the rotor, a gap is formed between the portion of the side surface of the positioning recess excluding the recess-side positioning surface and the portion of the side surface of the positioning projection excluding the projection-side positioning surface.

[0010] In this embodiment of the pump device, a recess-side positioning surface is formed on the side surface of the positioning recess formed on the second blade member, and the side surface of the positioning projection formed on the first blade member contacts it. The portion of the side surface of the positioning projection that contacts the recess-side positioning surface becomes the projection-side positioning surface. Furthermore, in this embodiment, when viewed from the axial direction of the rotor, a gap is formed between the portion of the side surface of the positioning recess excluding the recess-side positioning surface and the portion of the side surface of the positioning projection excluding the projection-side positioning surface.

[0011] Therefore, in this embodiment, even if the dimensional accuracy of the first and second blade members is relatively low, it becomes possible to easily position the positioning protrusions in the positioning recesses during impeller assembly. Furthermore, in this embodiment, after positioning the positioning protrusions in the positioning recesses, the second blade member is moved relative to the first blade member until the recess-side positioning surface and the protrusion-side positioning surface come into contact, thereby making it possible to easily position the second blade member relative to the first blade member in a direction perpendicular to the axial direction of the rotor. Consequently, in this embodiment, even if the dimensional accuracy of the first and second blade members is relatively low, it becomes possible to easily position the second blade member relative to the first blade member in a direction perpendicular to the axial direction of the rotor during impeller assembly. [Effects of the Invention]

[0012] As described above, in one aspect of the present invention, in a pump device comprising an impeller having a first blade member on which a plurality of blades are formed and a second blade member formed separately from the first blade member and fixed to the first blade member, and a motor for rotating the impeller, even if the dimensional accuracy of the first blade member and the second blade member is relatively low, it becomes possible to easily position the second blade member relative to the first blade member in a direction perpendicular to the axial direction of the rotor when assembling the impeller. [Brief explanation of the drawing]

[0013] [Figure 1] Figure 1 is a cross-sectional view of a pump device according to an embodiment of the present invention. [Figure 2]Figure 2 is a perspective view of the magnet holding member and the first wing member shown in Figure 1. [Figure 3] Figure 3 is a plan view of the magnet holding member and the first wing member shown in Figure 2. [Figure 4] Figure 4 is a perspective view of the second wing member shown in Figure 1. [Figure 5] Figure 5 is a bottom view of the second wing member shown in Figure 4. [Figure 6] Figure 6 is a plan view illustrating the configuration of the impeller shown in Figure 1. [Figure 7] Figure 7 is an enlarged view of section E in Figure 6. [Figure 8] Figure 8 is a plan view illustrating the method for positioning the second blade member relative to the first blade member shown in Figure 1. [Modes for carrying out the invention]

[0014] Embodiments of the present invention will be described below with reference to the drawings.

[0015] (Overall configuration of the pump system) Figure 1 is a cross-sectional view of a pump device 2 according to an embodiment of the present invention. In the following description, the side in the Z1 direction as shown in Figure 1 will be referred to as the "upper" side, and the side in the Z2 direction as shown in Figure 1, which is opposite the upper side, will be referred to as the "lower" side. Note that the "upper and lower directions" in the following description are defined for the sake of explanation and do not necessarily coincide with the direction of the vertical line (vertical direction).

[0016] The pump device 2 of this embodiment is a type of pump called a canned pump (canned motor pump), and is used, for example, to circulate a cooling liquid such as cooling water. The pump device 2 includes an impeller 3, a motor 4 that rotates the impeller 3, and a circuit board 5 for controlling the motor 4. The motor 4 includes a rotor 6 and a stator 7. The impeller 3, the motor 4, and the circuit board 5 are disposed inside a case body 11 constituted by a housing 8, a case 9 that covers the upper side of the housing 8, and a cover 10 that covers the lower side of the housing 8. The axial direction of the rotor 6 coincides with the vertical direction. That is, the vertical direction is the axial direction of the rotor 6.

[0017] The housing 8, the case 9, and the cover 10 are formed of resin. The case 9 is joined to the upper end portion of the housing 8 by ultrasonic welding or vibration welding, and the cover 10 is joined to the lower end portion of the housing 8 by ultrasonic welding or vibration welding. The case 9 has a fluid (specifically, a liquid) suction portion 9b and a fluid discharge portion 9c formed therein. Inside the case body 11, a pump chamber 12 through which the fluid sucked from the suction portion 9b passes toward the discharge portion 9c is formed. The pump chamber 12 is defined by the housing 8 and the case 9. In the pump device 2, the fluid is sucked from the upper side of the pump device 2 and discharged in a direction orthogonal to the vertical direction.

[0018] The rotor 6 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.

[0019] The magnet holding member 15 is formed of resin. The magnet holding member 15 includes a first cylindrical portion 15b that constitutes the lower portion of the magnet holding member 15, a second cylindrical portion 15c that constitutes the upper portion of the magnet holding member 15, and a flange portion 15d disposed between the first cylindrical portion 15b and the second cylindrical portion 15c in the vertical direction. The magnet holding member 15 of the present embodiment is constituted by the first cylindrical portion 15b, the second cylindrical portion 15c, and the flange portion 15d. The first cylindrical portion 15b and the second cylindrical portion 15c are formed in a cylindrical shape. The flange portion 15d is formed in a flange shape that extends outward in the radial direction of the rotor 6. Also, the flange portion 15d is formed in an annular shape. The outer diameter of the flange portion 15d is larger than the outer diameters of the first cylindrical portion 15b and the second cylindrical portion 15c.

[0020] The drive magnet 14 is attached to the outer peripheral side of the magnet holding member 15. Specifically, the drive magnet 14 is disposed on the outer peripheral side of the first cylindrical portion 15b and is fixed to the first cylindrical portion 15b. The inner peripheral side of the lower end portion of the drive magnet 14 is caulked and fixed to the lower end portion of the first cylindrical portion 15b. The upper end surface of the drive magnet 14 is in contact with the lower surface of the flange portion 15d. The sleeve 16 is attached to the inner peripheral side of the magnet holding member 15.

[0021] The rotor 6 is rotatably supported by the fixed shaft 17 and rotates about the fixed shaft 17. The fixed shaft 17 is arranged such that the axial direction of the fixed shaft 17 coincides with the vertical direction. That is, as described above, the axial direction of the rotor 6 coincides with the vertical direction. The upper side (Z1 direction side) of the present embodiment is the first direction side which is one side of the axial direction of the rotor 6, and the lower side (Z2 direction side) is the second direction side which is the opposite side of the first direction side.

[0022] Case 9 has a recess formed therein where the upper end of the fixed shaft 17 is positioned. The lower end of the fixed shaft 17 is held in the housing 8. A portion of the fixed shaft 17 is positioned on the inner circumference side of the sleeve 16. A thrust bearing member 18 is attached to the fixed shaft 17, which contacts the upper end surface of the sleeve 16. In this embodiment, the sleeve 16 functions as a radial bearing for the rotor 6, and the sleeve 16 and the thrust bearing member 18 function as a thrust bearing for the rotor 6.

[0023] The impeller 3 is installed at the upper end of the rotor 6. The impeller 3 rotates together with the rotor 6. The axis of the impeller 3 coincides with the axis of the rotor 6. The impeller 3 and rotor 6 are located in the pump chamber 12. The impeller 3 comprises a first blade member 21 having a plurality of blades 21b arranged at a constant pitch in the circumferential direction of the rotor 6, and a second blade member 22 which is formed separately from the blade member 21 and fixed to the blade member 21. The impeller 3 in this embodiment is composed of the blade member 21 and the blade member 22. The specific configuration of the impeller 3 will be described later.

[0024] The stator 7 is formed in a cylindrical shape. Specifically, the stator 7 is formed in a substantially cylindrical shape. The stator 7 is located on the outer circumference side of the rotor 6. The stator 7 is positioned so that its axial direction coincides with its vertical direction. The stator 7 comprises a drive coil 23, a stator core 24, and an insulator 25. The stator core 24 comprises an annular outer ring portion and a plurality of salient pole portions that protrude radially inward from the outer ring portion toward the rotor 6. The tip surfaces of the salient pole portions (radially inward surfaces of the rotor 6) face the outer surface of the drive magnet 14 via a cylindrical portion 8b, which will be described later and constitutes a part of the housing 8. The insulator 25 is made of an insulating material such as resin. The drive coil 23 is wound around the salient pole portions of the stator core 24 via the insulator 25.

[0025] As described above, the housing 8 is made of resin. The housing 8 is integrally formed with the stator 7 so as to cover the drive coil 23, the stator core 24, and the insulator 25. In this embodiment, the housing 8 is integrally formed with the stator 7 by insert molding. The housing 8 includes a cylindrical portion 8b positioned between the tip surface of the salient pole of the stator core 24 and the outer circumferential surface of the drive magnet 14, and a bottom portion 8c that closes the lower end of the cylindrical portion 8b. The circuit board 5 is positioned below the bottom portion 8c.

[0026] The circuit board 5 is a rigid substrate such as a glass epoxy substrate and is formed in a flat plate shape. The circuit board 5 is positioned so that its thickness direction and vertical direction coincide. The circuit board 5 is also positioned outside the pump chamber 12. The circuit board 5 is fixed to the housing 8 by fixing screws 26. A drive coil 23 is electrically connected to the circuit board 5. The housing 8 serves to prevent fluid from the pump chamber 12 from flowing into the locations where the stator 7 and circuit board 5 are positioned. The cover 10 is fixed to the lower end of the housing 8 so as to cover the circuit board 5 from below.

[0027] (The structure of the impeller) Figure 2 is a perspective view of the magnet holding member 15 and the blade member 21 shown in Figure 1. Figure 3 is a plan view of the magnet holding member 15 and the blade member 21 shown in Figure 2. Figure 4 is a perspective view of the blade member 22 shown in Figure 1. Figure 5 is a bottom view of the blade member 22 shown in Figure 4. Figure 6 is a plan view illustrating the configuration of the impeller 3 shown in Figure 1. Figure 7 is an enlarged view of section E in Figure 6. Figure 8 is a plan view illustrating the method of positioning the blade member 22 relative to the blade member 21 shown in Figure 1. Note that in Figure 8, an enlarged view of the part corresponding to section E in Figure 6 is shown.

[0028] In Figures 6 to 8, the blade member 22 is shown with a dashed line for ease of explanation. In the following explanation, the radial direction of the rotor 6 will be referred to as the "radial direction," and the circumferential direction of the rotor 6 will be referred to as the "circumferential direction." Also, in the following explanation, the clockwise direction when viewed from above (CW direction in Figure 3, etc.) will be referred to as the "clockwise direction," and the opposite direction to the clockwise direction (CCW direction in Figure 3, etc.) will be referred to as the "counterclockwise direction."

[0029] As described above, the impeller 3 is composed of a blade member 21 and a blade member 22. The blade members 21 and 22 are made of resin. The blade member 21 is integrally formed with the magnet holding member 15 by injection molding. That is, the magnet holding member 15 and the blade member 21 are a single integrally molded resin part. The blade member 22 is positioned above the blade member 21 and is fixed to the upper side of the blade member 21. The blade member 22 is fixed to the blade member 21 by welding such as ultrasonic welding or vibration welding.

[0030] The blade member 21 comprises three or more blades 21b, a base 21c to which the lower ends of the multiple blades 21b are connected, and a plurality of positioning protrusions 21d for positioning the blade member 22 relative to the blade member 21 in a direction perpendicular to the vertical direction (i.e., a direction perpendicular to the axial direction of the rotor 6 (the radial and circumferential directions of the rotor 6)). In this embodiment, the blade member 21 is composed of multiple blades 21b, a base 21c, and a plurality of positioning protrusions 21d. In addition, the blade member 21 in this embodiment comprises six blades 21b and six positioning protrusions 21d.

[0031] The base portion 21c is formed in a flange shape that widens radially outward from the upper end of the magnet holding member 15. That is, the base portion 21c is formed in a flange shape that widens radially outward from the upper end of the second cylindrical portion 15c, and the upper end of the second cylindrical portion 15c is connected to the base portion 21c. The base portion 21c is formed in an annular and flat shape. The thickness direction of the base portion 21c coincides with the vertical direction. The outer diameter of the base portion 21c is larger than the outer diameter of the flange portion 15d of the magnet holding member 15.

[0032] The blades 21b impart centrifugal force to the fluid in the pump chamber 12. The six blades 21b are arranged on the upper surface of the base 21c at a constant pitch in the circumferential direction. The blades 21b protrude upward from the base 21c. The upper surface of the blades 21b is a plane perpendicular to the vertical direction. When viewed from above, the shape of the blades 21b is curved. Specifically, when viewed from above, the shape of the blades 21b is arc-shaped.

[0033] When viewed from above or below, the blades 21b are inclined with respect to the circumferential direction such that they are radially outward as they are viewed clockwise. That is, the counterclockwise end of a blade 21b is positioned radially inward than the clockwise end of a blade 21b. The counterclockwise end of one blade 21b is positioned radially inward of the blade 21b positioned counterclockwise to that blade 21b. The clockwise end of a blade 21b is positioned slightly radially inward from the outer circumferential surface of the base 21c.

[0034] As described above, the blade member 22 is fixed to the blade member 21 by welding. Specifically, the blade member 22 is fixed to the upper surface of the six blades 21b by welding. Before the blade member 22 is welded and fixed to the blade member 21, welding projections 21f, which are projections for welding and fixing the blade member 22 to the blade member 21, are formed on the upper surface of the blades 21b. Figures 2 and 3 illustrate the state of the blade member 21 before the blade member 22 is welded and fixed to it.

[0035] The welding projection 21f is formed along the blade 21b. For example, when viewed from above or below, the shape of the welding projection 21f is arc-shaped, and the radius of curvature of the welding projection 21f is approximately equal to the radius of curvature of the blade 21b. The welding projection 21f is formed clockwise from the midpoint of the blade 21b in the circumferential direction. When the blade member 22 is welded and fixed to the six blades 21b, the welding projection 21f melts. After the blade member 22 has been welded and fixed to the six blades 21b, the welding projection trace, which is the base of the melted welding projection 21f that was welded and fixed to the six blades 21b, is formed on the upper surface of the blade 21b.

[0036] The positioning projection 21d is formed on the upper surface of the blade 21b. The positioning projection 21d protrudes upward from the blade 21b. That is, the positioning projection 21d protrudes upward from the upper surface of the blade 21b. The positioning projection 21d is formed on each of the six blades 21b. The positioning projection 21d is formed on the clockwise end of the blade 21b. The positioning projection 21d is positioned counterclockwise from the clockwise end of the blade 21b. Also, in the blade member 21 before the blade member 22 is welded and fixed, the positioning projection 21d is positioned clockwise from the welding projection 21f.

[0037] The width of the positioning projection 21d in the radial direction narrows towards one side in the circumferential direction. Specifically, the width of the positioning projection 21d in the radial direction narrows towards the clockwise direction. The shape of the positioning projection 21d when viewed from above is triangular. The clockwise end of the positioning projection 21d is one of the three vertices of the triangular positioning projection 21d. The upper surface of the positioning projection 21d is a plane perpendicular to the vertical direction.

[0038] The radially inner surface of the positioning projection 21d is a projection-side positioning surface 21g for positioning the blade member 22 relative to the blade member 21 in a direction perpendicular to the vertical direction. The projection-side positioning surface 21g is a plane or curved surface that curves radially outward as it is directed toward one side in the circumferential direction. Specifically, the projection-side positioning surface 21g is a plane or a concave curved surface with a large radius of curvature that slopes radially outward as it is directed toward the clockwise direction. That is, when viewed from the vertical direction, the projection-side positioning surface 21g is inclined with respect to the circumferential direction as well as with respect to the direction perpendicular to the radial direction. Furthermore, when viewed from the vertical direction, the projection-side positioning surface 21g is also inclined with respect to the radial direction.

[0039] The radial outer surface 21h of the positioning projection 21d is, for example, a plane perpendicular to the radial direction. The circumferential surface 21j, which is the counterclockwise side of the positioning projection 21d, is a plane inclined with respect to the circumferential and radial directions. The width of the portion of the positioning projection 21d where the circumferential surface 21j is formed is equal to the width of the portion of the blade 21b where the circumferential surface 21j is formed. The apex surface 21k, which is the clockwise end of the positioning projection 21d, is a convex curved surface.

[0040] The side surface of the positioning projection 21d is composed of a projection-side positioning surface 21g, an outer surface 21h, a circumferential surface 21j, and a vertex surface 21k. The projection-side positioning surface 21g is in contact with the recess-side positioning surface 22g, which will be described later and is formed on the wing member 22. In other words, the portion of the side surface of the positioning projection 21d that is in contact with the recess-side positioning surface 22g is the projection-side positioning surface 21g.

[0041] The blade member 22 consists of a main body portion 22b formed in an annular shape and a cylindrical upper end portion 22c (see Figure 1) that protrudes upward from the center of the main body portion 22b. The center of the blade member 22 is a through hole 22d through which the fluid drawn in from the intake portion 9b passes. The outer diameter of the main body portion 22b is approximately equal to the outer diameter of the blade member 21. That is, the outer diameter of the blade member 22 is approximately equal to the outer diameter of the blade member 21.

[0042] The lower surface of the blade member 22 (i.e., the lower surface of the main body 22b) is a plane perpendicular to the vertical direction. Blade arrangement grooves 22e are formed on the lower surface of the blade member 22, where the upper end of the blade 21b is positioned. In other words, six blade arrangement grooves 22e are formed on the lower surface of the blade member 22. The blade arrangement grooves 22e are recessed upward from the lower surface of the blade member 22. The shape of the blade arrangement grooves 22e corresponds to the shape of the blade 21b, and when viewed from above, the shape of the blade arrangement grooves 22e is curved (specifically, arc-shaped). The bottom surface (upper surface) of the blade arrangement grooves 22e is a plane perpendicular to the vertical direction. The upper surface of the blade 21b is in contact with the bottom surface of the blade arrangement grooves 22e.

[0043] Furthermore, a positioning recess 22f is formed on the lower surface of the blade member 22, into which the positioning projection 21d engages. In other words, six positioning recesses 22f are formed on the lower surface of the blade member 22. The positioning recesses 22f are recessed upwards. Specifically, the positioning recesses 22f are recessed above the bottom surface of the blade arrangement groove 22e. The positioning recesses 22f are recessed to an intermediate position in the vertical direction of the blade member 22 and do not penetrate the blade member 22 in the vertical direction.

[0044] The positioning recess 22f is connected to one end of the blade arrangement groove 22e. Specifically, the positioning recess 22f is connected to the clockwise end of the blade arrangement groove 22e and is formed on the outer peripheral portion of the blade member 22. The positioning recess 22f is located above the clockwise end of the blade arrangement groove 22e. The positioning recess 22f does not connect to the outer peripheral surface of the blade member 22, and a wall is formed between the positioning recess 22f and the outer peripheral surface of the blade member 22. The width of the positioning recess 22f in the radial direction narrows towards one side in the circumferential direction. Specifically, the width of the positioning recess 22f in the radial direction narrows towards the clockwise side.

[0045] When viewed from above, the positioning recess 22f has a trapezoidal shape. The clockwise end of the positioning recess 22f is the upper bottom of the trapezoidal positioning recess 22f, and the counterclockwise end of the positioning recess 22f is the lower bottom of the trapezoidal positioning recess 22f. The bottom surface (upper surface) of the positioning recess 22f is a plane perpendicular to the vertical direction. The upper surface of the positioning projection 21d is in contact with the bottom surface of the positioning recess 22f.

[0046] The radial inner surface of the positioning recess 22f is the recess-side positioning surface 22g that the projection-side positioning surface 21g contacts. That is, the radial inner surface of the positioning recess 22f is the recess-side positioning surface 22g that the side surface of the positioning projection 21d contacts. The shape of the recess-side positioning surface 22g is such that the projection-side positioning surface 21g can contact it. That is, the recess-side positioning surface 22g is a flat or curved surface that curves radially outward as it moves toward one side in the circumferential direction.

[0047] Specifically, the recessed positioning surface 22g is a plane or a convex curved surface with a large radius of curvature that slopes outward in the radial direction as it is directed clockwise. That is, when viewed from above, the recessed positioning surface 22g is inclined with respect to the circumferential direction as well as with respect to the direction perpendicular to the radial direction. Furthermore, when viewed from above, the recessed positioning surface 22g is also inclined with respect to the radial direction. The recessed positioning surface 22g is located on the same plane as the radial inner surface of the blade arrangement groove 22e. In this embodiment, the blade member 22 is positioned relative to the blade member 21 in a direction perpendicular to the vertical direction by the projection-side positioning surface 21g and the recessed positioning surface 22g.

[0048] The radial outer surface 22h of the positioning recess 22f is, for example, a plane perpendicular to the radial direction. The outer surface 22h is located on the same plane as the radial outer surface of the blade arrangement groove 22e. The circumferential surface 22j, which is the counterclockwise side of the positioning recess 22f, and the circumferential surface 22k, which is the clockwise side of the positioning recess 22f, are planes inclined with respect to the circumferential and radial directions. The side surface of the positioning recess 22f is composed of the recess-side positioning surface 22g, the outer surface 22h, and the circumferential surfaces 22j and 22k.

[0049] When viewed from above, the outer shape of the positioning recess 22f is larger than the outer shape of the positioning projection 21d when viewed from above. When viewed from above, a gap is formed between the side surface of the positioning recess 22f, excluding the recess-side positioning surface 22g, and the side surface of the positioning projection 21d, excluding the projection-side positioning surface 21g. That is, when viewed from above, a gap is formed between the outer surface 22h of the positioning recess 22f and the outer surface 21h of the positioning projection 21d, between the circumferential side surface 22j of the positioning recess 22f and the circumferential side surface 21j of the positioning projection 21d, and between the circumferential side surface 22k of the positioning recess 22f and the apex side surface 21k of the positioning projection 21d (see Figure 7).

[0050] A portion of the blade arrangement groove 22e, positioned counterclockwise from the positioning recess 22f and connected to the positioning recess 22f, serves as a guide recess 22p for guiding the positioning projection 21d into the positioning recess 22f in the circumferential direction. In other words, a portion of the blade arrangement groove 22e is a guide recess 22p, and the guide recess 22p is formed on the lower surface of the blade member 22. The guide recess 22p is recessed on the upper side. The guide recess 22p is also connected to the positioning recess 22f. The radial width of the guide recess 22p is wider than the radial width of the positioning recess 22f.

[0051] The impeller 3 is assembled, for example, by an automatic assembly machine. For example, when assembling the impeller 3, first, the blade member 22 is placed on the blade member 21 such that the upper surface of the positioning projection 21d contacts the portion of the lower surface of the blade member 22 that is not in contact with the blade arrangement groove 22e and the positioning recess 22f (see Figure 8A). Then, the blade member 22 is rotated counterclockwise relative to the blade member 21. When the blade member 22 is rotated counterclockwise relative to the blade member 21, the positioning projection 21d eventually enters the guide recess 22p (see Figures 8B and 8C).

[0052] Subsequently, when the blade member 22 is rotated counterclockwise relative to the blade member 21, the positioning projection 21d engages with the positioning recess 22f (see Figure 8D). Then, when the blade member 22 is rotated counterclockwise further relative to the blade member 21, the projection-side positioning surface 21g and the recess-side positioning surface 22g come into contact, and the blade member 22 is positioned relative to the blade member 21 in a direction perpendicular to the vertical direction (see Figure 6).

[0053] When the blade member 22 is positioned relative to the blade member 21 in a direction perpendicular to the vertical direction, the blade member 22 is fixed to the upper surface of the six blades 21b by welding. Specifically, the blade arrangement groove 22e is joined and fixed to the upper end of the blade 21b that fits into the blade arrangement groove 22e by welding. Molten resin accumulates in the blade arrangement groove 22e when the blade arrangement groove 22e is welded to the upper end of the blade 21b. In other words, molten resin from the welding projection 21f accumulates in the blade arrangement groove 22e. The blade arrangement groove 22e serves to prevent the resin that has melted and hardened during welding from adhering to the lower surface of the blade member 22, etc.

[0054] (Main effects of this form) As described above, in this embodiment, a projection-side positioning surface 21g is formed on the positioning projection 21d of the blade member 21, and a recess-side positioning surface 22g is formed on the positioning recess 22f of the blade member 22 with which the positioning projection 21d engages, and the recess-side positioning surface 22g contacts the projection-side positioning surface 21g. Furthermore, in this embodiment, when viewed from above, a gap is formed between the side surface of the positioning recess 22f excluding the recess-side positioning surface 22g and the side surface of the positioning projection 21d excluding the projection-side positioning surface 21g.

[0055] Therefore, in this embodiment, even if the dimensional accuracy of the blade members 21 and 22 is relatively low, it becomes possible to easily position the positioning projection 21d in the positioning recess 22f when assembling the impeller 3. Furthermore, in this embodiment, after positioning the positioning projection 21d in the positioning recess 22f, the blade member 22 is moved relative to the blade member 21 until the recess-side positioning surface 22g and the projection-side positioning surface 21g come into contact, making it possible to easily position the blade member 22 relative to the blade member 21 in a direction perpendicular to the vertical direction. Thus, in this embodiment, even if the dimensional accuracy of the blade members 21 and 22 is relatively low, it becomes possible to easily position the blade member 22 relative to the blade member 21 in a direction perpendicular to the vertical direction when assembling the impeller 3.

[0056] In this embodiment, the radial inner surface of the positioning recess 22f becomes the recess-side positioning surface 22g, and the radial inner surface of the positioning projection 21d becomes the projection-side positioning surface 21g. Therefore, in this embodiment, even if an excessive load is applied to the recess-side positioning surface 22g, the excessive load acts radially inward on the blade member 22. Consequently, in this embodiment, even if an excessive load is applied to the recess-side positioning surface 22g, it is possible to prevent damage to the blade member 22.

[0057] In this embodiment, the recessed positioning surface 22g is a plane or a convex curved surface with a large radius of curvature that slopes radially outward as it moves clockwise, while the radial width of the positioning recess 22f narrows as it moves clockwise. Therefore, in this embodiment, even if the positioning recess 22f is formed on the outer peripheral portion of the blade member 22, it is possible to ensure the thickness (wall thickness) of the portion of the blade member 22 between the outer surface 22h of the positioning recess 22f and the outer peripheral surface of the blade member 22. Thus, in this embodiment, even if the positioning recess 22f is formed on the outer peripheral portion of the blade member 22, it is possible to ensure the strength of the blade member 22.

[0058] In this embodiment, a guide recess 22p is formed on the lower surface of the blade member 22 to guide the positioning projection 21d into the positioning recess 22f in the circumferential direction, and the guide recess 22p is connected to the positioning recess 22f in the circumferential direction. Therefore, in this embodiment, when assembling the impeller 3, by rotating the blade member 22 counterclockwise relative to the blade member 21, it becomes possible to more easily position the positioning projection 21d into the positioning recess 22f using the guide recess 22p. Consequently, in this embodiment, when assembling the impeller 3, it becomes possible to more easily position the blade member 22 relative to the blade member 21 in a direction perpendicular to the vertical direction.

[0059] In this embodiment, a portion of the blade arrangement groove 22e, where the upper end of the blade 21b is positioned, is a guide recess 22p. Therefore, in this embodiment, by utilizing a portion of the blade arrangement groove 22e where the upper end of the blade 21b is positioned, it becomes easier to position the positioning projection 21d in the positioning recess 22f during the assembly of the impeller 3. Thus, in this embodiment, compared to the case where the guide recess 22p is formed separately from the blade arrangement groove 22e, the configuration of the blade member 22 is simplified, while making it easier to position the positioning projection 21d in the positioning recess 22f during the assembly of the impeller 3.

[0060] (Other embodiments) The above-described embodiment is merely one example of a preferred embodiment of the present invention, and is not limited thereto. Various modifications can be made without altering the essence of the present invention.

[0061] In the above-described embodiment, the projection-side positioning surface 21g and the recess-side positioning surface 22g may be planes parallel to the radial direction. Also, in the above-described embodiment, the radial outer surface 21h of the positioning projection 21d may be the projection-side positioning surface for positioning the blade member 22 relative to the blade member 21 in a direction perpendicular to the vertical direction. In this case, the radial outer surface 22h of the positioning recess 22f becomes the recess-side positioning surface that the projection-side positioning surface contacts. Even in this case, when viewed from the vertical direction, a gap is formed between the side surface of the positioning recess 22f excluding the recess-side positioning surface and the side surface of the positioning projection 21d excluding the projection-side positioning surface, and a gap is formed between the radial inner surface of the positioning recess 22f and the radial inner surface of the positioning projection 21d.

[0062] Furthermore, in the above-described configuration, the circumferential side surface 21j of the positioning projection 21d may be the projection-side positioning surface, and the circumferential side surface 22j of the positioning recess 22f may be the recess-side positioning surface; or the apex side surface 21k of the positioning projection 21d may be the projection-side positioning surface, and the circumferential side surface 22k of the positioning recess 22f may be the recess-side positioning surface. Even in these cases, when viewed from above or below, a gap is formed between the portion of the side surface of the positioning recess 22f excluding the recess-side positioning surface and the portion of the side surface of the positioning projection 21d excluding the projection-side positioning surface.

[0063] In the above-described embodiment, the shape of the positioning projection 21d when viewed from above may be trapezoidal. Also, the shape of the positioning recess 22f when viewed from above may be triangular. Furthermore, in the above-described embodiment, the shape of the positioning projection 21d when viewed from above may be a shape other than trapezoidal or triangular, and the shape of the positioning recess 22f when viewed from above may be a shape other than trapezoidal or triangular.

[0064] In the above-described embodiment, the positioning recess 22f may penetrate the blade member 22 in the vertical direction. However, if the positioning recess 22f penetrates the blade member 22, a step may be created on the upper surface of the blade member 22, so it is preferable that the positioning recess 22f does not penetrate the blade member 22, as in the above-described embodiment. Also, in the above-described embodiment, the width of the positioning recess 22f in the radial direction may increase towards the clockwise direction or remain constant. In this case, the blade arrangement groove 22e and the positioning recess 22f may extend to the outer circumferential surface of the blade member 22. Also, in this case, the width of the positioning projection 21d in the radial direction may increase towards the clockwise direction or remain constant.

[0065] In the above-described embodiment, the positioning recess 22f does not have to be connected to one end of the blade arrangement groove 22e. In this case, a guide recess 22p may be formed separately from the blade arrangement groove 22e. In this case, the bottom surface (upper surface) of the positioning recess 22f and the bottom surface (upper surface) of the guide recess 22p may be positioned at the same location in the vertical direction. Furthermore, in the above-described embodiment, a guide recess for guiding the positioning projection 21d into the positioning recess 22f does not have to be formed in the blade member 22.

[0066] In the above-described embodiment, the positioning protrusions 21d only need to be formed in at least three locations. That is, the positioning protrusions 21d only need to be formed on at least three blades 21b. Also, in the above-described embodiment, the blade member 21, which is formed separately from the magnet holding member 15, may be fixed to the upper end of the magnet holding member 15. Furthermore, in the above-described embodiment, the shape of the blades 21b when viewed from above or below may be linear. In this case, for example, six blades 21b are arranged radially. Also, in the above-described embodiment, the number of blades 21b on the blade member 21 may be three or more, five or fewer, or seven or more.

[0067] In the above-described configuration, a wing corresponding to wing 21b and a positioning projection corresponding to positioning projection 21d may be formed on the wing member 22, and a positioning recess corresponding to positioning recess 22f may be formed on the wing member 21. In this case, wing member 21 becomes the second wing member, and wing member 22 becomes the first wing member. Also in this case, the upper side (Z1 direction side) becomes the second direction side, and the lower side (Z2 direction side) becomes the first direction side.

[0068] (Configuration of this technology) In this technology, it is preferable that the inner surface of the positioning recess in the radial direction of the rotor serves as the recess-side positioning surface, and the inner surface of the positioning projection in the radial direction of the rotor serves as the projection-side positioning surface. With this configuration, even if an excessive load is applied to the recess-side positioning surface, the excessive load acts toward the inside of the second blade member in the radial direction of the rotor. Therefore, even if an excessive load is applied to the recess-side positioning surface, it becomes possible to prevent damage to the second blade member.

[0069] In this technology, for example, the recessed positioning surface is a flat or curved surface that extends radially outward from the rotor as it moves toward one side in the circumferential direction of the rotor, and the width of the positioning recess and the width of the positioning projection in the radial direction of the rotor narrow as they move toward one side in the circumferential direction of the rotor. In this case, for example, even if the positioning recess is formed on the outer peripheral portion of the second blade member, it becomes possible to ensure the thickness (wall thickness) of the portion of the second blade member between the outer end of the positioning recess in the radial direction of the rotor and the outer peripheral surface of the second blade member. Therefore, even if the positioning recess is formed on the outer peripheral portion of the second blade member, it becomes possible to ensure the strength of the second blade member.

[0070] In this technology, for example, the shape of the positioning recess when viewed from the axial direction of the rotor and the shape of the positioning projection when viewed from the axial direction of the rotor are trapezoidal or triangular.

[0071] In this technology, it is preferable that a guide recess is formed on the second direction side surface of the second blade member to guide a positioning projection into a positioning recess in the circumferential direction of the rotor, and that the guide recess is recessed toward the first direction and connected to the positioning recess in the circumferential direction of the rotor. With this configuration, when assembling the impeller, by moving the second blade member in the circumferential direction of the rotor relative to the first blade member, it becomes possible to more easily position the positioning projection in the positioning recess using the guide recess. Therefore, when assembling the impeller, it becomes possible to more easily position the second blade member relative to the first blade member in a direction perpendicular to the axial direction of the rotor.

[0072] In this technology, the shape of the blades when viewed from the axial direction of the rotor is arc-shaped, and a blade arrangement groove is formed on the second direction side surface of the second blade member, which is recessed toward the first direction side and where the end of the blade toward the first direction is positioned. The positioning recess is connected to one end of the blade arrangement groove, and preferably a portion of the blade arrangement groove is a guide recess. With this configuration, it becomes possible to more easily position the positioning protrusion in the positioning recess during impeller assembly by utilizing a portion of the blade arrangement groove where the end of the blade toward the first direction is positioned. Therefore, compared to the case where the guide recess is formed separately from the blade arrangement groove, it becomes possible to simplify the configuration of the second blade member while more easily positioning the positioning protrusion in the positioning recess during impeller assembly. [Explanation of Symbols]

[0073] 2. Pumping device 3-Paddle Wheel 4 motors 6 rotors 7 Status 21. Blade member (first blade member) 21b Feather 21c base 21d Positioning projection 21g projection-side positioning surface 22. Blade member (second blade member) 22e Blade arrangement groove 22f Positioning recess 22g recessed side positioning surface 22p Guide recess Z1 1st direction side Z2 2nd direction side One side of the CW rotor in the circumferential direction

Claims

1. A motor having a rotor and a stator, and an impeller that rotates together with the rotor, The impeller comprises a first blade member having a plurality of blades arranged at a constant pitch in the circumferential direction of the rotor, and a 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. If one side of the rotor in the axial direction is designated as the first direction side, and the side opposite the first direction side is designated as the second direction side, The second blade member is positioned on the first direction side of the first blade member, The first blade member comprises a base portion to which the ends of the multiple blades on the second direction side are connected, and a plurality of positioning protrusions for positioning the second blade member relative to the first blade member in a direction perpendicular to the axial direction of the rotor. The positioning projection is formed on the surface of the blade on the first direction side and protrudes from the blade in the first direction side. On the surface of the second wing member on the second direction side, a positioning recess is formed that is recessed on the first direction side and engages with the positioning projection. A recess-side positioning surface is formed on the side surface of the positioning recess, which the side surface of the positioning projection contacts. The portion of the side surface of the positioning projection that contacts the recessed positioning surface is the projection-side positioning surface. When viewed from the axial direction of the rotor, the recessed positioning surface and the projection-side positioning surface are inclined with respect to the circumferential direction of the rotor. A pump device characterized in that, when viewed from the axial direction of the rotor, a gap is formed between the portion of the side surface of the positioning recess, excluding the recess-side positioning surface, and the portion of the side surface of the positioning projection, excluding the projection-side positioning surface.

2. The inner surface of the positioning recess in the radial direction of the rotor is the recess-side positioning surface. The pump device according to claim 1, characterized in that the inner surface of the positioning projection in the radial direction of the rotor is the projection-side positioning surface.

3. The recessed positioning surface is a flat or curved surface that extends outward in the radial direction of the rotor as it moves toward one side in the circumferential direction of the rotor. The pump device according to claim 2, characterized in that the width of the positioning recess in the radial direction of the rotor and the width of the positioning projection in the radial direction of the rotor narrow towards one side in the circumferential direction of the rotor.

4. The pump device according to claim 3, characterized in that the shape of the positioning recess and the shape of the positioning projection when viewed from the axial direction of the rotor are trapezoidal or triangular.

5. On the second direction side surface of the second blade member, a guide recess is formed for guiding the positioning projection into the positioning recess in the circumferential direction of the rotor. The pump device according to any one of claims 1 to 4, characterized in that the guide recess is recessed toward the first direction and is connected to the positioning recess in the circumferential direction of the rotor.

6. The shape of the blades when viewed from the axial direction of the rotor is arc-shaped. On the second direction side surface of the second blade member, a blade arrangement groove is formed that is recessed toward the first direction and where the end of the blade toward the first direction is positioned. The positioning recess is connected to one end of the blade arrangement groove, The pump device according to claim 5, characterized in that a portion of the blade arrangement groove is the guide recess.

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