Pump device

Abstract

In a pump device, an impeller (3) comprises: a first blade member (21) having a plurality of blades (21b); and a second blade member (22) formed separately from the first blade member and fixed to the first blade member, the first blade member being formed with a plurality of positioning protrusions (21d) for positioning the second blade member with respect to the first blade member in a direction orthogonal to the axial direction of the rotor. On a side surface of a positioning recess (22f) formed in the second blade member, a recess-side positioning surface (22g) that is in contact with a side surface of the positioning protrusion is formed, and a portion of the side surface of the positioning protrusion that is in contact with the recess-side positioning surface (22g) is a protrusion-side positioning surface (21g). When viewed from the axial direction of the rotor, a gap is formed between a portion of the side surface of the positioning recess (22f) other than the recess-side positioning surface (22g) and a portion of the side surface of the positioning protrusion other than the protrusion-side positioning surface (21g).

Description

Technical Field

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

[0002] A pump assembly is known to include: a resin impeller disposed within a pump chamber; and a motor for driving the impeller to rotate (see, for example, Patent Document 1). In the pump assembly 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 integrally formed with the plurality of blades; and an impeller cover separately formed with the blades and the base. The impeller blades and the base are integrally formed with a magnet retaining 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 assembly described in Patent Document 1, the cover is fixed to the end faces of multiple blades (specifically, one end face of each blade in the rotor axial direction) by ultrasonic welding. Cylindrical locating pins are formed on the end faces of the multiple blades for positioning the cover relative to the blades and base in a direction orthogonal to the rotor axial direction. The locating pins are arranged, for example, on an imaginary circle with the impeller axis as the center of curvature when viewed from the rotor axial direction. The cover has multiple engaging holes for engaging the locating pins. In the pump assembly described in Patent Document 1, the cover is positioned relative to the blades and base in a direction orthogonal to the rotor axial direction by means of the locating pins and engaging holes. Existing technical documents Patent documents

[0004] Patent Document 1: Description of Chinese Patent Application Publication No. 113790161 Summary of the Invention

[0005] The inventors of this application have developed a pump assembly comprising an impeller disposed within a pump chamber and a motor for rotating the impeller. In the pump assembly under development, the impeller includes a first blade assembly and a second blade assembly separately formed from the first blade assembly. Similar to the impeller described in Patent Document 1, the first blade assembly includes: a plurality of blades arranged at a constant spacing along the circumference of the rotor; and a base for connecting the base ends of the plurality of blades. The second blade assembly is fixed to one end face of the plurality of blades in the axial direction of the rotor.

[0006] In the pump device under development, similar to the pump device described in Patent Document 1, locating pins are formed on the end faces of multiple blades of the first blade component, and engaging holes that engage with the locating pins are formed on the second blade component. This allows the second blade component to be positioned relative to the first blade component in a direction orthogonal to the rotor's axial direction. At this time, the multiple locating pins and engaging holes are arranged on an imaginary circle with the impeller's axis of curvature as its center when viewed from the rotor's axial direction.

[0007] However, in this situation, unless multiple locating pins are precisely formed on the first blade component and multiple engaging holes are precisely formed on the second blade component, it is difficult to engage each of the multiple locating pins with each of the multiple engaging holes during impeller assembly. Furthermore, without improving the dimensional accuracy of the first and second blade components, it is difficult to easily position the second blade component relative to the first blade component in a direction orthogonal to the rotor's axial direction during impeller assembly.

[0008] Therefore, the object of the present invention is to provide a pump device comprising: an impeller having a first blade component and a second blade component, the first blade component having a plurality of blades, the second blade component being separately formed from and fixed to the first blade component; and a motor that rotates the impeller, wherein even if the dimensional accuracy of the first blade component and the second blade component is low, the second blade component can be easily positioned relative to the first blade component in a direction orthogonal to the axial direction of the rotor during impeller assembly.

[0009] To address the aforementioned problems, a pump device according to one aspect of the present invention includes: a motor having a rotor and a stator; and an impeller rotating together with the rotor, the impeller comprising: a first blade component having a plurality of blades arranged at a constant spacing in the circumferential direction of the rotor; and a second blade component separately formed from and fixed to the first blade component, the impeller's axis coinciding with the rotor's axis, wherein one side of the rotor's axial direction is designated as a first direction side, and the opposite side of the first direction side is designated as a second direction side, the second blade component is disposed on the first direction side of the first blade component, the first blade component comprising: a base connected to the ends of the plurality of blades on the second direction side; and a plurality of positioning protrusions for positioning the second blade component relative to the first blade component. The component is positioned in a direction orthogonal to the rotor axis. A positioning protrusion is formed on the surface of the blade in the first direction and protrudes from the blade toward the first direction. A positioning recess is formed on the surface of the second blade component in the second direction. The positioning recess is recessed toward the first direction and engages with the positioning protrusion. A recess-side positioning surface is formed on the side of the positioning recess that contacts the side of the positioning protrusion. The part of the side of the positioning protrusion that contacts the recess-side positioning surface is called the protrusion-side positioning surface. When viewed from the rotor axis, the recess-side positioning surface and the protrusion-side positioning surface are inclined relative to the rotor circumferentially. When viewed from the rotor axis, a gap is formed between the part of the side of the positioning recess other than the recess-side positioning surface and the part of the side of the positioning protrusion other than the protrusion-side positioning surface.

[0010] In this pump assembly, a recess-side positioning surface is formed on the side of the positioning recess formed on the second blade member, which contacts the side of the positioning protrusion formed on the first blade member. The portion of the side of the positioning protrusion that contacts the recess-side positioning surface becomes the protrusion-side positioning surface. Furthermore, in this assembly, when viewed from the axial direction of the rotor, a gap is formed between the portion of the side of the positioning recess other than the recess-side positioning surface and the portion of the side of the positioning protrusion other than the protrusion-side positioning surface.

[0011] Therefore, in this method, even if the dimensional accuracy of the first and second blade components is low, the positioning protrusion can be easily positioned in the positioning recess during impeller assembly. Furthermore, in this method, after positioning the positioning protrusion in the positioning recess, by moving the second blade component relative to the first blade component until the positioning surface on the recess side contacts the positioning surface on the protrusion side, the second blade component can be easily positioned relative to the first blade component in a direction orthogonal to the rotor's axial direction. Therefore, in this method, even if the dimensional accuracy of the first and second blade components is low, the second blade component can be easily positioned relative to the first blade component in a direction orthogonal to the rotor's axial direction during impeller assembly.

[0012] As described above, in one aspect of the present invention, the pump device includes: an impeller having a first blade component and a second blade component, the first blade component having a plurality of blades, and the second blade component being separately formed from and fixed to the first blade component; and a motor that rotates the impeller, wherein even if the dimensional accuracy of the first blade component and the second blade component is low, the second blade component can be easily positioned relative to the first blade component in a direction orthogonal to the rotor axis during impeller assembly. Attached Figure Description

[0013] Figure 1 This is a cross-sectional view of the pump device according to an embodiment of the present invention. Figure 2 yes Figure 1 A perspective view of the magnet holding component and the first blade component shown. Figure 3 yes Figure 2 The top view of the magnet holding component and the first blade component shown. Figure 4 yes Figure 1 A perspective view of the second blade component shown. Figure 5 yes Figure 4 The bottom view of the second blade component shown. Figure 6 It is used for explanation Figure 1 The diagram shows a top view of the impeller structure. Figure 7 yes Figure 6 Enlarged view of section E in the middle. Figure 8A , Figure 8B , Figure 8C , Figure 8D It is used for explanation Figure 1 A top view showing the positioning method of the second blade component relative to the first blade component. Detailed Implementation

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

[0015] (Overall structure of the pump unit) Figure 1 This is a cross-sectional view of the pump device 2 according to an embodiment of the present invention. In the following description, Figure 1 The Z1 direction side in the equation is called the "upper" side, and the opposite side is... Figure 1 The Z2 direction side in the equation is called the "down" side. In the following explanation, "up and down direction" is defined for ease of explanation and does not necessarily coincide with the direction of the plumb line (vertical direction).

[0016] The pump assembly 2 of this embodiment is a type of pump known as a shielded pump, used for circulating cooling liquids such as cooling water. The pump assembly 2 includes: an impeller 3; a motor 4 for rotating 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 housing 11, which is composed of a housing 8, a shell 9 covering the upper side of the housing 8, and a cover 10 covering the lower side of the housing 8. The axial direction of the rotor 6 is aligned with the vertical direction. In other words, the vertical direction is the axial direction of the rotor 6.

[0017] The outer casing 8, shell 9, and cover 10 are made of resin. Shell 9 is joined to the upper end of outer casing 8 by ultrasonic welding or vibration welding, and cover 10 is joined to the lower end of outer casing 8 by ultrasonic welding or vibration welding. Shell 9 has a fluid (specifically liquid) intake section 9b and a fluid discharge section 9c. A pump chamber 12 is formed inside the casing 11, through which fluid drawn in from the intake section 9b flows to the discharge section 9c. The pump chamber 12 is formed by the division of outer casing 8 and shell 9. In the pump device 2, fluid is drawn in 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 generally 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 are aligned with the vertical direction.

[0019] The magnet holding member 15 is made of resin. The magnet holding member 15 includes: a first cylindrical portion 15b constituting the lower part of the magnet holding member 15; a second cylindrical portion 15c constituting the upper part of the magnet holding member 15; and a flange portion 15d disposed vertically between the first cylindrical portion 15b and the second cylindrical portion 15c. In this embodiment, the magnet holding member 15 is composed of 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 radially outward toward the rotor 6. Furthermore, the flange portion 15d is formed in an annular shape. The outer diameter of the flange portion 15d is larger than the outer diameter of the first cylindrical portion 15b and the second cylindrical portion 15c.

[0020] A drive magnet 14 is mounted on the outer periphery of the magnet holding member 15. Specifically, the drive magnet 14 is disposed on the outer periphery of the first cylindrical portion 15b and fixed to the first cylindrical portion 15b. The inner periphery of the lower end of the drive magnet 14 is fixed to the lower end of the first cylindrical portion 15b by riveting. The upper end face of the drive magnet 14 contacts the lower surface of the flange portion 15d. A sleeve 16 is mounted on the inner periphery of the magnet holding member 15.

[0021] The rotor 6 is rotatably supported by a fixed shaft 17 and rotates around the fixed shaft 17. The fixed shaft 17 is configured such that its axial direction is aligned with its vertical direction. That is, as described above, the axial direction of rotor 6 is aligned with the vertical direction. In this embodiment, the upper side (Z1 direction side) is one side of the axial direction of rotor 6, i.e., the first direction side, and the lower side (Z2 direction side) is the opposite side of the first direction side, i.e., the second direction side.

[0022] The housing 9 has a recess, and the upper end of the fixed shaft 17 is disposed in the recess. The lower end of the fixed shaft 17 is held by the housing 8. A portion of the fixed shaft 17 is disposed on the inner circumferential side of the sleeve 16. A thrust bearing component 18, which contacts the upper end face of the sleeve 16, is mounted on the fixed shaft 17. In this embodiment, the sleeve 16 functions as a radial bearing for the rotor 6, and the sleeve 16 and the thrust bearing component 18 function as a thrust bearing for the rotor 6.

[0023] Impeller 3 is mounted on the upper end of rotor 6. Impeller 3 rotates together with rotor 6. The axis of impeller 3 coincides with the axis of rotor 6. Impeller 3 and rotor 6 are disposed within pump chamber 12. Impeller 3 includes: a blade component 21 as a first blade component, having a plurality of blades 21b arranged at a constant spacing along the circumference of rotor 6; and a blade component 22 as a second blade component, which is separately formed from and fixed to blade component 21. The impeller 3 in this embodiment is composed of blade component 21 and blade component 22. The specific structure of impeller 3 will be described later.

[0024] The stator 7 is formed in a cylindrical shape. Specifically, the stator 7 is formed in a generally cylindrical shape. The stator 7 is disposed on the outer periphery of the rotor 6. The stator 7 is arranged in a manner that aligns with its axial direction and vertical direction. The stator 7 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 an annular shape; and a plurality of salient pole portions protruding radially inward from the outer peripheral ring portion toward the rotor 6. The front end face of the salient pole portion (the radially inward surface of the rotor 6) faces the outer peripheral surface of the drive magnet 14 via the cylindrical portion 8b, which forms part of the housing 8 (described later). The insulator 25 is made of an insulating material such as resin. The drive coil 23 is wound around the salient pole portion 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 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, which is cylindrical and disposed between the front end face of the salient pole portion of the stator core 24 and the outer peripheral surface of the drive magnet 14; and a bottom 8c, which closes the lower end of the cylindrical portion 8b. The circuit board 5 is disposed on the lower side of the bottom 8c.

[0026] Circuit board 5 is a rigid board such as glass epoxy board, formed into a flat plate shape. Circuit board 5 is arranged so that its thickness direction is consistent with its vertical direction. Additionally, circuit board 5 is disposed on the outside of pump chamber 12. Circuit board 5 is fixed to housing 8 by fixing screws 26. Drive coil 23 is electrically connected to circuit board 5. Housing 8 serves to prevent fluid in pump chamber 12 from flowing into the area where stator 7 and circuit board 5 are disposed. Cover 10 is fixed to the lower end of housing 8 to cover circuit board 5 from below.

[0027] (Structure of the impeller) Figure 2 yes Figure 1 A perspective view of the magnet holding component 15 and the blade component 21 shown. Figure 3 yes Figure 2 The top view of the magnet holding component 15 and the blade component 21 shown. Figure 4 yes Figure 1 The three-dimensional view of the blade component 22 shown. Figure 5 yes Figure 4 The blade component 22 shown is a bottom view. Figure 6 It is used for explanation Figure 1 The top view of the structure of impeller 3 shown. Figure 7 yes Figure 6 Enlarged view of section E in the middle. Figure 8A , Figure 8B , Figure 8C , Figure 8D It is used for explanation Figure 1 The top view shows the positioning method of blade component 22 relative to blade component 21. Figure 8A , Figure 8B , Figure 8C , Figure 8D It shows the relationship with Figure 6 The enlarged view of part E in the image.

[0028] For ease of explanation, Figure 6 -8 shows the blade component 22 with dashed lines. In the following description, the radial direction of the rotor 6 will be referred to as "radial," and the circumferential direction (circumferential direction) of the rotor 6 will be referred to as "circumferential." In the following description, the clockwise direction when viewed from above ( Figure 3 The CW direction in the equation is called the "clockwise direction," and the direction opposite to the clockwise direction ( Figure 3 The CCW direction in the equation is called the "counterclockwise direction".

[0029] As described above, the impeller 3 is composed of blade component 21 and blade component 22. Blade components 21 and 22 are formed of resin. Blade component 21 is integrally formed with magnet holding component 15 by injection molding. That is, magnet holding component 15 and blade component 21 are integrally molded resin components. Blade component 22 is disposed on the upper side of blade component 21 and fixed to the upper side of blade component 21. Blade component 22 is fixed to blade component 21 by welding such as ultrasonic welding and vibration welding.

[0030] The blade component 21 includes: three or more blades 21b; a base 21c connected to the lower end of the blades 21b; and a plurality of positioning protrusions 21d for positioning the blade component 22 relative to the blade component 21 in a direction orthogonal to the vertical direction (i.e., a direction orthogonal to the axial direction of the rotor 6 (radial and circumferential directions of the rotor 6)). In this embodiment, the blade component 21 is composed of a plurality of blades 21b, a base 21c, and a plurality of positioning protrusions 21d. Furthermore, in this embodiment, the blade component 21 includes six blades 21b and six positioning protrusions 21d.

[0031] The base 21c is formed as a flange extending radially outward from the upper end of the magnet holding member 15. Specifically, the base 21c is formed as a flange extending 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 21c. The base 21c is formed in an annular or flat shape. The thickness direction of the base 21c is consistent with the vertical direction. The outer diameter of the base 21c is larger than the outer diameter of the flange portion 15d of the magnet holding member 15.

[0032] Blade 21b applies centrifugal force to the fluid within pump chamber 12. Six blades 21b are arranged circumferentially at a constant spacing on the upper surface of base 21c. Blade 21b protrudes upward from base 21c. The upper surface of blade 21b is a plane orthogonal to the vertical direction. When viewed from the vertical direction, blade 21b has a curved shape. Specifically, blade 21b has an arc shape when viewed from the vertical direction.

[0033] When viewed from above, the blade 21b is tilted relative to the circumferential direction, thus moving radially outward as it travels clockwise. That is, the counterclockwise end of the blade 21b is positioned radially inward of the clockwise end of the blade 21b. The counterclockwise end of one blade 21b is positioned radially inward of another blade 21b positioned closer to the counterclockwise side than that blade 21b. The clockwise end of the blade 21b is positioned slightly closer to the radially inward side than the outer circumferential surface of the base 21c.

[0034] As described above, the blade component 22 is fixed to the blade component 21 by welding. Specifically, the blade component 22 is fixed to the upper surface of the six blades 21b by welding. Before welding the blade component 22 to the blade component 21, a welding protrusion 21f is formed on the upper surface of the blade 21b. This welding protrusion 21f is a welding protrusion used to weld the blade component 22 to the blade component 21. Figure 2 and Figure 3 The state of the blade component 21 before the blade component 22 is welded and fixed is shown.

[0035] The welding protrusion 21f is formed along the blade 21b. For example, the welding protrusion 21f is arc-shaped when viewed from above, and its radius of curvature is approximately equal to that of the blade 21b. The welding protrusion 21f is formed from the center of the circumference of the blade 21b toward the clockwise direction. When the blade component 22 is welded and fixed to the six blades 21b, the welding protrusion 21f melts. After the blade component 22 is welded and fixed to the blade component 21, a welding protrusion mark is formed on the upper surface of the blade 21b. This welding protrusion mark is formed at the root of the welding protrusion 21f that melted when the blade component 22 was welded and fixed to the six blades 21b.

[0036] A positioning protrusion 21d is formed on the upper surface of the blade 21b. The positioning protrusion 21d protrudes upward from the blade 21b. That is, the positioning protrusion 21d protrudes upward from the upper surface of the blade 21b. Each of the six blades 21b has a positioning protrusion 21d. The positioning protrusion 21d is formed at the clockwise end of the blade 21b. The positioning protrusion 21d is positioned further counterclockwise than the clockwise end of the blade 21b. In addition, in the blade component 21 before the blade component 22 is welded and fixed, the positioning protrusion 21d is positioned further clockwise than the welding protrusion 21f.

[0037] The positioning protrusion 21d narrows radially towards one side in the circumferential direction. Specifically, the positioning protrusion 21d narrows radially in a clockwise direction. When viewed from above, the positioning protrusion 21d is triangular. The clockwise end of the positioning protrusion 21d forms one of the three vertices of the triangular positioning protrusion 21d. The upper surface of the positioning protrusion 21d is a plane orthogonal to the vertical direction.

[0038] The radially inner surface of the positioning protrusion 21d is called the protrusion-side positioning surface 21g, which is used to position the blade component 22 relative to the blade component 21 in a direction orthogonal to the vertical direction. The protrusion-side positioning surface 21g is a plane or curved surface that extends radially outward toward the circumferential side. Specifically, the protrusion-side positioning surface 21g is a plane or a concave curved surface with a large radius of curvature that is inclined radially outward as it extends toward the clockwise side. That is, when viewed from the vertical direction, the protrusion-side positioning surface 21g is inclined relative to the circumferential direction and also inclined relative to the direction orthogonal to the radial direction. When viewed from the vertical direction, the protrusion-side positioning surface 21g is also inclined relative to the radial direction.

[0039] The radially outer surface 21h of the positioning protrusion 21d is, for example, a plane orthogonal to the radial direction. The counterclockwise side surface 21j of the positioning protrusion 21d, i.e., the circumferential side surface 21j, is a plane inclined relative to both the circumferential and radial directions. The width of the portion of the positioning protrusion 21d with the circumferential side surface 21j is equal to the width of the portion of the blade 21b with the circumferential side surface 21j. The end side surface 21k of the clockwise side of the positioning protrusion 21d, i.e., the apex side surface 21k, is formed as a convex curved surface.

[0040] The side surface of the positioning protrusion 21d is composed of a protrusion-side positioning surface 21g, an outer side surface 21h, a circumferential side surface 21j, and a vertex side surface 21k. The protrusion-side positioning surface 21g contacts the recessed side positioning surface 22g formed on the blade component 22 (described later). That is, the portion of the side surface of the positioning protrusion 21d that contacts the recessed side positioning surface 22g becomes the protrusion-side positioning surface 21g.

[0041] The blade component 22 consists of a main body 22b formed in a circular shape and a cylindrical upper end portion 22c protruding upward from the center of the main body 22b (see reference). Figure 1 The blade component 22 is composed of a through hole 22d at its center, through which fluid drawn in from the suction section 9b passes. The outer diameter of the main body 22b is approximately equal to the outer diameter of the blade component 21. That is, the outer diameter of the blade component 22 is approximately equal to the outer diameter of the blade component 21.

[0042] The lower surface of the blade component 22 (i.e., the lower surface of the main body 22b) is a plane orthogonal to the vertical direction. A blade mounting groove 22e is formed on the lower surface of the blade component 22, and the upper end of the blade 21b is positioned within this blade mounting groove 22e. That is, six blade mounting grooves 22e are formed on the lower surface of the blade component 22. The blade mounting grooves 22e are recessed upwards from the lower surface of the blade component 22. The shape of the blade mounting grooves 22e corresponds to the shape of the blade 21b, and the shape of the blade mounting grooves 22e when viewed from the vertical direction is curved (specifically, arc-shaped). The bottom surface (upper surface) of the blade mounting groove 22e is a plane orthogonal to the vertical direction. The upper surface of the blade 21b is in contact with the bottom surface of the blade mounting groove 22e.

[0043] Additionally, a positioning recess 22f is formed on the lower surface of the blade component 22 to engage with the positioning protrusion 21d. Specifically, six positioning recesses 22f are formed on the lower surface of the blade component 22. The positioning recesses 22f are recessed upwards. More specifically, the positioning recesses 22f are recessed upwards further than the bottom surface of the blade arrangement groove 22e. The positioning recesses 22f are recessed to the middle position of the blade component 22 in the vertical direction and do not penetrate the blade component 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 side of the blade member 22. The positioning recess 22f is disposed above the clockwise end of the blade arrangement groove 22e. The positioning recess 22f is not connected 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 radial width of the positioning recess 22f narrows towards the circumferential direction. Specifically, the radial width of the positioning recess 22f narrows in the clockwise direction.

[0045] The positioning recess 22f is trapezoidal in shape when viewed from above. The clockwise end of the positioning recess 22f forms the upper bottom of the trapezoidal positioning recess 22f, and the counterclockwise end forms the lower bottom of the trapezoidal positioning recess 22f. The bottom surface (upper surface) of the positioning recess 22f is a plane orthogonal to the vertical direction. The upper surface of the positioning protrusion 21d contacts the bottom surface of the positioning recess 22f.

[0046] The radially inner surface of the positioning recess 22f becomes a recess-side positioning surface 22g that contacts the protruding-side positioning surface 21g. That is, the radially inner surface of the positioning recess 22f becomes a recess-side positioning surface 22g that contacts the side surface of the positioning protrusion 21d. The recess-side positioning surface 22g is formed in a shape that allows it to contact the protruding-side positioning surface 21g. Specifically, the recess-side positioning surface 22g is a plane or curved surface that extends radially outward toward one circumferential side.

[0047] Specifically, the recessed side positioning surface 22g is either a plane that extends radially outward as it moves clockwise, or a convex surface with a large radius of curvature. That is, when viewed from above, the recessed side positioning surface 22g is inclined relative to the circumferential direction and also inclined relative to a direction orthogonal to the radial direction. Furthermore, when viewed from above, the recessed side positioning surface 22g is also inclined relative to the radial direction. The recessed side positioning surface 22g and the radially inner surface of the blade mounting groove 22e are disposed on the same plane. In this embodiment, the blade component 22 is positioned relative to the blade component 21 in a direction orthogonal to the above and below directions by means of the protruding side positioning surface 21g and the recessed side positioning surface 22g.

[0048] The radially outer surface 22h of the positioning recess 22f is, for example, a plane orthogonal to the radial direction. The outer surface 22h and the radially outer surface of the blade mounting slot 22e are disposed on the same plane. The counterclockwise side surface 22j and the clockwise side surface 22k of the positioning recess 22f are planes inclined relative to the circumferential and radial directions, respectively. The side surface of the positioning recess 22f is composed of the recess-side positioning surface 22g, the outer surface 22h, and the circumferential side surfaces 22j and 22k.

[0049] The locating recess 22f has a larger external shape when viewed from above than the locating protrusion 21d. When viewed from above, a gap is formed between the portion of the side of the locating recess 22f (excluding the recess-side locating surface 22g) and the portion of the side of the locating protrusion 21d (excluding the protrusion-side locating surface 21g). That is, when viewed from above, gaps are formed between the outer surface 22h of the locating recess 22f and the outer surface 21h of the locating protrusion 21d, between the circumferential side 22j of the locating recess 22f and the circumferential side 21j of the locating protrusion 21d, and between the circumferential side 22k of the locating recess 22f and the apex side 21k of the locating protrusion 21d (see reference). Figure 7 ).

[0050] The portion of the blade arrangement groove 22e located on the counterclockwise side of the positioning recess 22f and connected to the positioning recess 22f becomes a guide recess 22p for guiding the positioning protrusion 21d circumferentially to the positioning recess 22f. That is, a portion of the blade arrangement groove 22e becomes the guide recess 22p, which is formed on the lower surface of the blade member 22. The guide recess 22p is recessed upwards. Furthermore, the guide recess 22p is connected to the positioning recess 22f. The radial width of the guide recess 22p is greater than the radial width of the positioning recess 22f.

[0051] The impeller 3 is assembled, for example, by an automated assembly machine. For instance, when assembling the impeller 3, firstly, the blade component 22 is placed on the blade component 21 such that the upper surface of the positioning protrusion 21d contacts the portion of the lower surface of the blade component 22 located outside the blade arrangement groove 22e and the positioning recess 22f (see...). Figure 8A Subsequently, the blade component 22 is rotated counterclockwise relative to the blade component 21. As the blade component 22 rotates counterclockwise relative to the blade component 21, the positioning protrusion 21d eventually enters the guide recess 22p (see...). Figure 8B , Figure 8C ).

[0052] Subsequently, when the blade component 22 is rotated further counterclockwise relative to the blade component 21, the positioning protrusion 21d enters the positioning recess 22f (see...). Figure 8DSubsequently, as the blade component 22 rotates further counterclockwise relative to the blade component 21, the protruding side positioning surface 21g contacts the recessed side positioning surface 22g, and the blade component 22 is positioned relative to the blade component 21 in a direction orthogonal to the vertical direction (see...). Figure 6 ).

[0053] When the blade component 22 is positioned relative to the blade component 21 in a direction orthogonal to the vertical direction, the blade component 22 is fixed to the upper surface of the six blades 21b by welding. Specifically, the blade mounting groove 22e is joined and fixed to the upper end of the blade 21b that enters the blade mounting groove 22e by welding. The blade mounting groove 22e is used to accumulate the resin that melts when the blade mounting groove 22e is welded to the upper end of the blade 21b. That is, the resin that melts from the welding protrusion 21f is accumulated in the blade mounting groove 22e. The blade mounting groove 22e serves to prevent the resin that melts and solidifies during welding from adhering to the lower surface of the blade component 22, etc.

[0054] (Main effects of this implementation method) As described above, in this embodiment, a protrusion-side positioning surface 21g is formed on the positioning protrusion 21d of the blade component 21, and a recess-side positioning surface 22g that contacts the protrusion-side positioning surface 21g is formed in the positioning recess 22f of the blade component 22 that engages with the positioning protrusion 21d. Furthermore, in this embodiment, when viewed from above, 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.

[0055] Therefore, in this embodiment, even if the dimensional accuracy of the blade components 21 and 22 is low, the positioning protrusion 21d can be easily positioned in the positioning recess 22f when assembling the impeller 3. Furthermore, in this embodiment, after positioning the positioning protrusion 21d in the positioning recess 22f, the blade component 22 is moved relative to the blade component 21 until the recess-side positioning surface 22g contacts the protrusion-side positioning surface 21g. This allows for easy positioning of the blade component 22 relative to the blade component 21 in a direction orthogonal to the vertical direction. Therefore, in this embodiment, even if the dimensional accuracy of the blade components 21 and 22 is low, the blade component 22 can be easily positioned relative to the blade component 21 in a direction orthogonal to the vertical direction when assembling the impeller 3.

[0056] In this embodiment, the radially inner surface of the positioning recess 22f becomes the recess-side positioning surface 22g, and the radially inner surface of the positioning protrusion 21d becomes the protrusion-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 will act radially inward toward the blade component 22. Therefore, in this embodiment, even if an excessive load is applied to the recess-side positioning surface 22g, damage to the blade component 22 can be prevented.

[0057] In this embodiment, the recessed positioning surface 22g is a plane or a convex surface with a large radius of curvature, which tilts radially outward towards the clockwise direction. On the other hand, the radial width of the positioning recess 22f narrows towards the clockwise direction. Therefore, in this embodiment, even if the positioning recess 22f is formed on the outer peripheral side of the blade member 22, the thickness (wall thickness) of the portion of the blade member 22 located between the outer surface 22h of the positioning recess 22f and the outer peripheral surface of the blade member 22 can be ensured. Therefore, in this embodiment, even if the positioning recess 22f is formed on the outer peripheral side of the blade member 22, the strength of the blade member 22 can be ensured.

[0058] In this embodiment, a guide recess 22p is formed on the lower surface of the blade component 22 to guide the positioning protrusion 21d circumferentially to the positioning recess 22f. The guide recess 22p is connected to the positioning recess 22f circumferentially. Therefore, in this embodiment, when assembling the impeller 3, by rotating the blade component 22 counterclockwise relative to the blade component 21, the positioning protrusion 21d can be more easily positioned in the positioning recess 22f using the guide recess 22p. Therefore, in this embodiment, when assembling the impeller 3, it is easier to position the blade component 22 relative to the blade component 21 in a direction orthogonal to the vertical direction.

[0059] In this embodiment, the upper end portion of the blade 21b in the blade arrangement groove 22e becomes the guide recess 22p. Therefore, in this embodiment, by utilizing the upper end portion of the blade 21b in the blade arrangement groove 22e, the positioning protrusion 21d can be more easily positioned within the positioning recess 22f when assembling the impeller 3. Therefore, in this embodiment, compared to the case where the blade arrangement groove 22e and the guide recess 22p are formed separately, the structure of the blade component 22 can be simplified, and the positioning protrusion 21d can be more easily positioned within the positioning recess 22f when assembling the impeller 3.

[0060] (Other implementation methods) The above-described embodiment is an example of a preferred embodiment of the present invention, but the present invention is not limited to this embodiment. Various modifications can be made without changing the spirit of the present invention.

[0061] In the above embodiment, the protruding side positioning surface 21g and the concave side positioning surface 22g can be planes parallel to the radial direction. Furthermore, in the above embodiment, the radially outer surface 21h of the positioning protrusion 21d can be used as the protruding side positioning surface for positioning the blade component 22 relative to the blade component 21 in a direction orthogonal to the vertical direction. In this case, the radially outer surface 22h of the positioning recess 22f becomes the concave side positioning surface that contacts the protruding side positioning surface. Even in this case, when viewed from the vertical direction, a gap is formed between the portion of the side surface of the positioning recess 22f other than the concave side positioning surface and the portion of the side surface of the positioning protrusion 21d other than the protruding side positioning surface, and a gap is also formed between the radially inner surface of the positioning recess 22f and the radially inner surface of the positioning protrusion 21d.

[0062] Furthermore, in the above embodiments, the circumferential side surface 21j of the positioning protrusion 21d may be a protrusion-side positioning surface, and the circumferential side surface 22j of the positioning recess 22f may be a recess-side positioning surface; alternatively, the vertex side surface 21k of the positioning protrusion 21d may be a protrusion-side positioning surface, and the circumferential side surface 22k of the positioning recess 22f may be a recess-side positioning surface. Even in these cases, when viewed from above, a gap will form 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 protrusion 21d excluding the protrusion-side positioning surface.

[0063] In the above embodiment, the positioning protrusion 21d can be trapezoidal when viewed from the top and bottom. Additionally, the positioning recess 22f can also be triangular when viewed from the top and bottom. Furthermore, in the above embodiment, the positioning protrusion 21d and the positioning recess 22f can be any shape other than trapezoidal or triangular when viewed from the top and bottom.

[0064] In the above embodiment, the positioning recess 22f can penetrate the blade component 22 in the vertical direction. However, if the positioning recess 22f penetrates the blade component 22, a step may be formed on the upper surface of the blade component 22. Therefore, it is preferable that the positioning recess 22f does not penetrate the blade component 22, as in the above embodiment. Furthermore, in the above embodiment, the radial width of the positioning recess 22f can increase in the clockwise direction or remain unchanged. In this case, the blade placement groove 22e and the positioning recess 22f can also extend to the outer peripheral surface of the blade component 22. In this case, the radial width of the positioning protrusion 21d can increase in the clockwise direction or remain unchanged.

[0065] In the above embodiment, the positioning recess 22f may not be connected to one end of the blade placement groove 22e. In this case, the guide recess 22p may be formed separately from the blade placement 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 embodiment, the blade component 22 may not have a guide recess for guiding the positioning protrusion 21d to the positioning recess 22f.

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

[0067] In the above embodiment, a blade corresponding to the blade 21b and a positioning protrusion corresponding to the positioning protrusion 21d may be formed on the blade component 22, and a positioning recess corresponding to the positioning recess 22f may be formed on the blade component 21. In this case, the blade component 21 becomes the second blade component, and the blade component 22 becomes the first blade component. At this time, the upper side (Z1 direction side) is the second direction side, and the lower side (Z2 direction side) is the first direction side.

[0068] (Configuration of this technology) In this technology, preferably, the inner surface of the positioning recess in the rotor radial direction becomes the recess-side positioning surface, and the inner surface of the positioning protrusion in the rotor radial direction becomes the protrusion-side positioning surface. According to this structure, even if an excessive load is applied to the recess-side positioning surface, the excessive load will act towards the inner side of the second blade component in the rotor radial direction. Therefore, even if an excessive load is applied to the recess-side positioning surface, damage to the second blade component can be prevented.

[0069] In this technology, for example, the positioning surface on the recess side is a plane or a curved surface that extends radially outward from the circumferential side of the rotor. The width of the positioning recess in the rotor radial direction and the width of the positioning protrusion in the rotor radial direction narrow towards the circumferential side of the rotor. In this case, for example, even if the positioning recess is formed on the outer peripheral side of the second blade component, the thickness (wall thickness) of the portion of the second blade component located between the outer end of the positioning recess in the rotor radial direction and the outer peripheral surface of the second blade component can be ensured. Therefore, even if the positioning recess is formed on the outer peripheral side of the second blade component, the strength of the second blade component can be ensured.

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

[0071] In this technology, preferably, a guide recess is formed on the surface of the second blade component on the second direction side, which guides the positioning protrusion to the positioning recess in the circumferential direction of the rotor. The guide recess is recessed towards the first direction side and connects to the positioning recess in the circumferential direction of the rotor. According to this structure, when assembling the impeller, by moving the second blade component relative to the first blade component along the circumferential direction of the rotor, the positioning protrusion can be more easily positioned in the positioning recess using the guide recess. Therefore, when assembling the impeller, it is easier to position the second blade component relative to the first blade component in a direction orthogonal to the axial direction of the rotor.

[0072] In this technology, preferably, the blade shape is arc-shaped when viewed from the rotor's axial direction. A blade placement groove is formed on the second direction side surface of the second blade component. This blade placement groove is recessed towards the first direction side and is used to position the end of the blade on the first direction side. A positioning recess is connected to one end of the blade placement groove, and a portion of the blade placement groove serves as a guide recess. According to this structure, when assembling the impeller, the positioning protrusion can be more easily positioned within the positioning recess by utilizing the portion of the blade placement groove that positions the end of the blade on the first direction side. Therefore, compared to the case where the blade placement groove and the guide recess are formed separately, the structure of the second blade component can be simplified, and when assembling the impeller, the positioning protrusion can be more easily positioned within the positioning recess. Symbol Explanation

[0073] 2. Pump unit 3 Impeller 4 motors 6 rotors 7. Stator 21 Blade Component (First Blade Component) 21b blade 21c base 21d positioning protrusion 21g protruding side positioning surface 22-blade assembly (second blade assembly) 22e Blade Configuration Slot 22f Positioning recess 22g Recessed side positioning surface 22p Guide recess Z1 First Direction Side Z2 Second Direction Side The circumferential side of the CW rotor.

Claims

1. A pump device, characterized by Comprise: a motor having a rotor and a stator; and an impeller that rotates together with the rotor, the impeller including: 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 shaft center of the impeller coincides with the shaft center of the rotor, when one side of the rotor in the axial direction is set as a first direction side and the opposite side of the first direction side is set 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 includes: a base connected to the end portions of the plurality of blades on the second direction side; and a plurality of positioning protrusions for positioning the second blade member relative to the first blade member in a direction orthogonal to the axial direction of the rotor, the positioning protrusions are formed on the faces of the blades on the first direction side and protrude from the blades toward the first direction side, a positioning recess is formed on the face of the second blade member on the second direction side, the positioning recess is recessed toward the first direction side and engages with the positioning protrusions, on the side face of the positioning recess, a recess side positioning face is formed that contacts the side face of the positioning protrusions, the portion of the side face of the positioning protrusions that contacts the recess side positioning face becomes a protrusion side positioning face, when viewed in the axial direction of the rotor, the recess side positioning face and the protrusion side positioning face are inclined with respect to the circumferential direction of the rotor, when viewed in the axial direction of the rotor, a gap is formed between the portion of the side face of the positioning recess other than the recess side positioning face and the portion of the side face of the positioning protrusions other than the protrusion side positioning face.

2. The pump device according to claim 1, wherein the inner side face of the positioning recess in the radial direction of the rotor becomes the recess side positioning face, the inner side face of the positioning protrusions in the radial direction of the rotor becomes the protrusion side positioning face.

3. The pump device according to claim 2, wherein the recess side positioning face is a flat face or a curved face that extends to the outer side in the radial direction of the rotor as it goes toward one side in the circumferential direction of the rotor, the width of the positioning recess in the radial direction of the rotor and the width of the positioning protrusions in the radial direction of the rotor narrow as they go toward one side in the circumferential direction of the rotor.

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

5. The pump device according to any one of claims 1 to 4, wherein a guide recess is formed on the face of the second blade member on the second direction side, the guide recess being for guiding the positioning protrusions in the circumferential direction of the rotor to the positioning recess, the guide recess is recessed toward the first direction side and is connected to the positioning recess in the circumferential direction of the rotor.

6. The pump device according to claim 5, wherein The shape of the vane is circular arc-like when viewed in the axial direction of the rotor, A vane arrangement groove is formed on the side of the second direction of the second vane member, the vane arrangement groove being recessed toward the first direction side, and the end portion of the vane on the first direction side is arranged in the vane arrangement groove, The positioning recess is connected to one end portion of the vane arrangement groove, A portion of the vane arrangement groove becomes the guide recess.

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