Pump device

Abstract

A pump device is provided with an impeller having a first blade member made of a resin and having a plurality of blades formed thereon, and a second blade member made of a resin and formed separately from the first blade member and having a plurality of blades fixed thereto. The pump device can restrain a welding part from being formed on the part, where the blades are fixed, of the second blade component. In the pump device, a plurality of gate marks (22c) formed on the second blade member (22) are respectively formed at intermediate positions in the circumferential direction of the rotor between two adjacent blades in the circumferential direction of the rotor, and an even number of blades are arranged between the gate marks in the circumferential direction of the rotor. In addition, the plurality of gate marks are disposed further to the outside in the radial direction of the rotor than the outer peripheral surface of the portion of the cylindrical magnet holding member (15) that is connected to the second blade member (22). The invention provides a pump device which can restrain the formation of a welding part on a part of a second blade part fixed with a blade.

Description

Technical Field

[0001] The present invention relates to a pump device including an impeller and a motor for rotating the impeller. Background Art

[0002] In the past, a pump device having an impeller disposed in a pump chamber and an electric motor for driving the impeller to rotate is known (for example, refer to Patent Document 1). In the pump device described in Patent Document 1, the electric motor has a rotor and a stator disposed on the outer peripheral side of the rotor. The rotor has a driving magnet and a cylindrical retaining portion in which the driving magnet is embedded by insert molding. The impeller is formed of resin. The impeller has a plurality of blades, a cover portion integrally formed with the blades, and a base portion formed separately from the blades and the cover portion. The base portion is formed integrally with the retaining portion by injection molding. The end faces of the base side of the plurality of blades are fixed to the base portion by ultrasonic welding.

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: Chinese Patent Application Publication No. 115833416 Summary of the invention

[0006] Technical problem to be solved by the invention

[0007] The inventor of the present application has developed a pump device including an impeller disposed in a pump chamber and an electric motor for rotating the impeller. In the pump device, the rotor includes a resin magnet holding component having a driving magnet mounted on the outer peripheral side. The magnet holding component is formed, for example, in a substantially cylindrical shape. The impeller includes: a first blade component made of resin, which has a plurality of blades; and a second blade component made of resin, which is formed separately from the first blade component and fixes the first blade component. As in the pump device described in Patent Document 1, the second blade component is formed integrally with the magnet holding component by injection molding. The second blade component is formed in a flange shape that extends from one end of the magnet holding component to the radially outer side of the rotor.

[0008] The inventors of the present application have studied a case where, in a pump device under development, the end of a second blade component side of a plurality of blades is fixed to a second blade component by welding or the like, as in the pump device described in Patent Document 1. In addition, the inventors of the present application have studied a case where a gate is provided on the second blade component side of a mold for manufacturing a second blade component and a magnet holding component by integral molding. In this case, if the position of the gate is not properly set, a fragile weld portion may be formed in the portion of the second blade component that fixes the blade. In addition, if a weld portion is formed in the portion of the second blade component that fixes the blade, undesirable conditions such as a reduction in the fixing strength between the blade and the second blade component may occur.

[0009] Therefore, the subject of the present invention is to provide a pump device, which has an impeller, the impeller has a first blade component made of resin with multiple blades, and a second blade component made of resin that is formed separately from the first blade component and has multiple blades fixed thereto, and the pump device can suppress the formation of a welding portion at the portion of the second blade component to which the blades are fixed.

[0010] Technical solutions adopted to solve technical problems

[0011] In order to solve the above-mentioned problems, the pump device of the present invention comprises: an electric motor having a rotor and a stator; and an impeller rotating together with the rotor, the rotor having a cylindrical driving magnet and a cylindrical resin magnet holding component on the outer peripheral side of which the driving magnet is mounted, the impeller comprising: a resin first blade component having an even number of blades of more than 4 arranged at a constant pitch in the circumferential direction of the rotor; and a resin second blade component, which is formed separately from the first blade component and fixes the first blade component, the axial direction of the cylindrical magnet holding component being consistent with the axial direction of the rotor, when one side of the axial direction of the rotor is set as the first direction side and the opposite side of the first direction side is set as the second direction side The second blade component is formed integrally with the magnet holding component by injection molding, and is formed into a flange shape extending from the first direction end of the magnet holding component to the radially outer side of the rotor, and a plurality of blades are fixed to the first direction side of the second blade component, and a plurality of gate marks are formed on the surface of the first direction side of the second blade component, and the plurality of gate marks are arranged at a position radially outer side of the rotor than the outer peripheral surface of the portion of the magnet holding component connected to the second blade component, and are arranged in the circumferential direction of the rotor, and the plurality of gate marks are respectively formed on two adjacent blades in the circumferential direction of the rotor and in the middle position in the circumferential direction of the rotor, and an even number of blades are arranged between the gate marks in the circumferential direction of the rotor.

[0012] In the pump device of the present invention, a plurality of gate marks formed on the surface on the first direction side of the second blade component are respectively formed at the middle position of two blades adjacent in the circumferential direction of the rotor, and an even number of blades are arranged between the gate marks in the circumferential direction of the rotor. Therefore, in the present invention, it is possible to suppress the formation of a weld portion in the fixed blade portion of the second blade component. In addition, in this specification, "the middle position of two blades adjacent in the circumferential direction of the rotor" includes: the center position of two blades adjacent in the circumferential direction of the rotor (the complete center position) in the circumferential direction of the rotor; and the approximate center position of two blades adjacent in the circumferential direction of the rotor that is slightly deviated from the center position in the circumferential direction of the rotor.

[0013] In addition, in the present invention, a plurality of gate marks formed on the surface on the first direction side of the second blade component are arranged at a position that is closer to the outside of the rotor in the radial direction than the outer peripheral surface of the portion of the magnet holding component connected to the second blade component. Therefore, in the present invention, when the magnet holding component and the second blade component are integrally manufactured by injection molding, the resin that has just flowed in from the gate of the mold flows only in the radial direction of the rotor. Therefore, in the present invention, the flow of the resin formed in the second blade component can be simplified, and as a result, the flow of the resin formed in the second blade component can be easily controlled.

[0014] Therefore, in the present invention, when the magnet holding member and the second blade member are integrally manufactured by injection molding, the flow of resin can be controlled in such a way that a weld is formed at a portion of the second blade member that deviates from the portion of the fixed blade. Therefore, in the present invention, the formation of a weld at the portion of the fixed blade of the second blade member can be effectively suppressed.

[0015] In the present invention, it is preferred that a plurality of gate marks are formed at the same position in the radial direction of the rotor. When configured in this way, the flow of the resin formed in the second blade member is simplified and the flow of the resin formed in the second blade member is more easily controlled. Therefore, the formation of a welded portion in the portion of the second blade member to which the blade is fixed can be more effectively suppressed.

[0016] In the present invention, it is preferred that a plurality of gate marks are formed at a middle position of the second blade member in the radial direction of the rotor. If so configured, the distance that the resin formed on the second blade member flows in the radial direction of the rotor can be shortened. Therefore, the flow of the resin formed on the second blade member is simplified and the flow of the resin formed on the second blade member is easier to control, with the result that the formation of a welded portion in the portion of the second blade member to which the blades are fixed can be more effectively suppressed. In addition, in the present specification, "the middle position of the second blade member in the radial direction of the rotor" includes: the center position of the second blade member in the radial direction of the rotor (the complete center position); and the approximate center position of the second blade member in the radial direction of the rotor that is slightly deviated from the center position.

[0017] In the present invention, it is preferred that a plurality of gate marks are formed at equal intervals in the circumferential direction of the rotor. In this case, it is more preferred that the second blade member has gate marks half the number of blades of the first blade member. With this configuration, a homogeneous second blade member can be formed in the circumferential direction of the rotor. In addition, in this case, for example, the first blade member has 10 blades, and five gate marks are formed on the second blade member.

[0018] In the present invention, it is preferred that a groove portion is formed on the surface of the second blade member on the first direction side, into which the ends of the second direction side of the plurality of blades enter, and the ends of the second direction side of the blades are fixed to the groove portion by welding within a range outside the gate mark in the radial direction of the rotor. The fluid pressure acting on the outer peripheral portion of the impeller is higher than the fluid pressure acting on the inner peripheral portion of the impeller, but if it is configured in this way, the fixing strength of the blades and the second blade member in the outer peripheral portion of the impeller can be improved, so even if the fluid pressure acting on the outer peripheral portion of the impeller becomes high, the blades can be prevented from being separated from the second blade member.

[0019] Effects of the Invention

[0020] As described above, in the present invention, in a pump device having an impeller including a first blade member made of resin and having a plurality of blades formed thereon and a second blade member made of resin and having a plurality of blades fixed thereon, it is possible to suppress the formation of welded portions at portions of the second blade member to which the blades are fixed. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a cross-sectional view of the pump device according to the embodiment of the present invention.

[0022] Figure 2 yes Figure 1 An enlarged view of part E of FIG.

[0023] Figure 3 yes Figure 1 A bottom view of the first blade component is shown.

[0024] Figure 4 yes Figure 1 A top view of the second blade member and the magnet holding member is shown.

[0025] Figure 5A and Figure 5B It is a plan view of a second blade member and a magnet holding member according to another embodiment of the present invention.

[0026] Description of Reference Numerals

[0027] 1… pump device; 2… impeller; 3… motor; 5… rotor; 6… stator; 14… driving magnet; 15… magnet holding member; 21… first blade member; 21a… blade; 22… second blade member; 22a… groove; 22c… gate mark; Z1… first direction side; Z2… second direction side. DETAILED DESCRIPTION

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

[0029] (Overall structure of the pump device)

[0030] Figure 1 1 is a cross-sectional view of a pump device 1 according to an embodiment of the present invention. Figure 1 The Z1 direction side of the same is set as the "upper" side, and the side opposite to the upper side is set as Figure 1 The Z2 direction side of the same is set as the "downward" side.

[0031] The pump device 1 of this embodiment is a type of pump called a canned pump (canned electric pump), and is used, for example, to circulate a cooling liquid. The pump device 1 includes an impeller 2, an electric motor 3 for rotating the impeller 2, and a circuit board 4 for controlling the electric motor 3. The electric motor 3 is composed of a rotor 5 and a stator 6. The impeller 2, the electric motor 3, and the circuit board 4 are arranged inside a housing 10 composed of a housing 7, a shell 8 covering the upper side of the housing 7, and a cover 9 covering the lower side of the housing 7.

[0032] The housing 7, the case 8 and the cover 9 are formed of resin. The housing 8 is joined to the upper end of the housing 7 by ultrasonic welding, and the cover 9 is joined to the lower end of the housing 7 by ultrasonic welding. The housing 8 is formed with a fluid suction portion 8a and a fluid discharge portion 8b. A pump chamber 11 is formed inside the housing 10, and the fluid sucked from the suction portion 8a passes through the pump chamber 11 toward the discharge portion 8b. The pump chamber 11 is divided by the housing 7 and the housing 8. In the pump device 1, the fluid is sucked from the upper side of the pump device 1, and the fluid is ejected in a direction orthogonal to the up-down direction.

[0033] The rotor 5 includes a cylindrical driving magnet 14, a magnet holding component 15 for holding the driving magnet 14, and a cylindrical sleeve 16 held by the magnet holding component 15. The driving magnet 14 and the sleeve 16 are formed into a cylindrical shape. The magnet holding component 15 is formed into a cylindrical shape. Specifically, the magnet holding component 15 is formed into a roughly cylindrical shape. The axial direction of the driving magnet 14, the axial direction of the magnet holding component 15, and the axial direction of the sleeve 16 are consistent with the up and down directions. The driving magnet 14 is mounted on the outer peripheral side of the magnet holding component 15, and the sleeve 16 is mounted on the inner peripheral side of the magnet holding component 15. The specific structure of the magnet holding component 15 will be described below.

[0034] The rotor 5 is rotatably supported on the fixed shaft 17. The fixed shaft 17 is arranged so that the axial direction of the fixed shaft 17 coincides with the up-down direction. That is, the up-down direction is the axial direction of the rotor 5. The upper end of the fixed shaft 17 is held by the housing 8, and the lower end of the fixed shaft 17 is held by the outer shell 7. The fixed shaft 17 is inserted through the inner circumference of the sleeve 16. The thrust bearing component 18 in contact with the upper end surface of the sleeve 16 is mounted on the fixed shaft 17. In this embodiment, the sleeve 16 functions as a radial bearing of the rotor 5, and the sleeve 16 and the thrust bearing component 18 function as thrust bearings of the rotor 5. The upper side (Z1 direction side) of this embodiment becomes one side of the axial direction of the rotor 5, that is, the first direction side, and the lower side (Z2 direction side) becomes the opposite side of the first direction side, that is, the second direction side.

[0035] The impeller 2 is arranged on the upper side of the rotor 5. The impeller 2 rotates together with the rotor 5. The impeller 2 and the rotor 5 are arranged in the pump chamber 11. The impeller 2 includes: a first blade member 21, which has a plurality of blades 21a arranged at a constant pitch in the circumferential direction of the rotor 5; and a second blade member 22, which is formed separately from the first blade member 21 and fixes the first blade member 21. The impeller 2 of this embodiment is composed of the first blade member 21 and the second blade member 22. The specific structure of the impeller 2 will be described later.

[0036] The stator 6 is formed in a generally cylindrical shape as a whole. The stator 6 is arranged on the outer peripheral side of the rotor 5. In addition, the stator 6 is arranged so that the axial direction of the stator 6 coincides with the up-down direction. That is, the up-down direction is the axial direction of the stator 6. The stator 6 includes a drive coil 23, a stator core 24, and an insulator 25.

[0037] The stator core 24 includes an outer peripheral ring portion formed in an annular shape, and a plurality of salient pole portions protruding from the outer peripheral ring portion toward the radial inner side of the rotor 5. The front end surface of the salient pole portion (the radial inner side surface of the rotor 5) faces the outer peripheral surface of the driving magnet 14 via a cylindrical portion 7a described later constituting a part of the housing 7. The insulator 25 is formed of an insulating material such as resin. The driving coil 23 is wound around the salient pole portion of the stator core 24 via the insulator 25.

[0038] As described above, the housing 7 is formed of resin. The housing 7 is formed integrally with the stator 6 in a manner covering the drive coil 23, the stator core 24, and the insulator 25. In this embodiment, the housing 7 is formed integrally with the stator 6 by insert molding. The housing 7 has: a cylindrical portion 7a disposed between the front end surface of the salient pole portion of the stator core 24 and the outer peripheral surface of the drive magnet 14; and a bottom portion 7b that closes the lower end of the cylindrical portion 7a. The circuit board 4 is disposed on the lower side of the bottom portion 7b.

[0039] The circuit board 4 is a rigid board such as a glass epoxy board, and is formed in a flat plate shape. The circuit board 4 is arranged so that the thickness direction of the circuit board 4 coincides with the up-and-down direction.

[0040] In addition, the circuit board 4 is arranged outside the pump chamber 11. The circuit board 4 is fixed to the housing 7 by fixing screws 27. The driving coil 23 is electrically connected to the circuit board 4. The housing 7 has the function of preventing the fluid in the pump chamber 11 from flowing into the stator 6 and the arrangement position of the circuit board 4. The cover 9 is fixed to the lower end of the housing 7 in a manner covering the circuit board 4 from the lower side.

[0041] (Structure of magnet holding component and impeller)

[0042] Figure 2 yes Figure 1 An enlarged view of part E of FIG. Figure 3 yes Figure 1 A bottom view of the first blade member 21 is shown. Figure 4 yes Figure 1 A top view of the second blade member 22 and the magnet holding member 15 is shown.

[0043] The magnet holding component 15 is formed of resin. In addition, as described above, the magnet holding component 15 is formed in a substantially cylindrical shape. The magnet holding component 15 includes: a first cylindrical portion 15a, which constitutes the lower portion of the magnet holding component 15; a second cylindrical portion 15b, which constitutes the upper portion of the magnet holding component 15; and a flange portion 15c, which is arranged between the first cylindrical portion 15a and the second cylindrical portion 15b in the up-down direction. The magnet holding component 15 of this embodiment is composed of a first cylindrical portion 15a, a second cylindrical portion 15b and a flange portion 15c.

[0044] The first cylinder 15a and the second cylinder 15b are formed in a cylindrical shape. The inner diameter of the second cylinder 15b is larger than the inner diameter of the first cylinder 15a. The outer diameter of the second cylindrical portion 15b is larger than the outer diameter of the first cylindrical portion 15a. The flange portion 15c is formed in a flange shape that expands outward in the radial direction of the rotor 5. In addition, the flange portion 15c is formed in a circular ring shape. The outer diameter of the flange portion 15c is larger than the outer diameter of the second tubular portion 15b.

[0045] The driving magnet 14 is arranged on the outer peripheral side of the first cylindrical portion 15a. The upper end surface of the driving magnet 14 contacts the lower surface of the flange portion 15c. The driving magnet 14 is fixed to the first cylindrical portion 15a by, for example, bonding. The sleeve 16 is arranged on the inner peripheral side of the first cylindrical portion 15a. The sleeve 16 is formed integrally with the first cylindrical portion 15a by, for example, insert molding. The portion of the upper end portion of the housing 8 that holds the fixed shaft 17 is arranged on the inner peripheral side of the second cylindrical portion 15b. In addition, the driving magnet 14 can also be formed integrally with the first cylindrical portion 15a by insert molding.

[0046] As described above, the impeller 2 is composed of a first blade component 21 and a second blade component 22. The first blade component 21 is fixed to the upper side of the second blade component 22. The first blade component 21 is formed of resin. The first blade component 21 is composed of a plurality of blades 21a and a top plate portion 21b connected to the upper ends of the plurality of blades 21a. The first blade component 21 has an even number of blades 21a of more than 4. The first blade component 21 of this embodiment has 10 blades 21a. A through hole 21c is formed in the center of the top plate portion 21b for the fluid sucked from the suction portion 8a to pass through.

[0047] Ten blades 21a are arranged on the outer peripheral side of the through hole 21c. In addition, as described above, the ten blades 21a are arranged at a constant pitch in the circumferential direction of the rotor 5. The blades 21a protrude downward from the top plate 21b. The shape of the blade 21a when viewed from the top and bottom directions is curved. For example, the shape of the blade 21a when viewed from the top and bottom directions is arc-shaped. The blade 21a includes: a blade body 21d connected to the top plate 21b and applying centrifugal force to the fluid; and a protrusion 21e protruding downward from the blade body 21d.

[0048] The outer shape of the protrusion 21e is smaller than the outer shape of the blade body 21d. The protrusion 21e constitutes the lower end of the blade 21a. The protrusion 21e is arranged in the groove 22a formed in the second blade member 22. Three of the ten blades 21a are formed with positioning pins 21f, which are used to position the first blade member 21 relative to the second blade member 22 in a direction orthogonal to the up-down direction (see Figure 3 ). The positioning pin 21f protrudes downward from the protruding portion 21e.

[0049] The second blade member 22 is formed of resin. In addition, the second blade member 22 is formed integrally with the magnet holding member 15 by injection molding. That is, the magnet holding member 15 and the second blade member 22 are one integrally formed resin part. The second blade member 22 is formed into a flange shape extending from the upper end of the magnet holding member 15 to the radially outer side of the rotor 5.

[0050] That is, the second blade component 22 is formed into a flange shape extending from the upper end of the second cylinder 15b to the radial outer side of the rotor 5, and the upper end of the second cylinder 15b is connected to the second blade component 22. The second blade component 22 is formed into an annular and flat plate shape. The thickness direction of the second blade component 22 is consistent with the up and down direction. The outer diameter of the second blade component 22 is larger than the outer diameter of the flange portion 15c of the magnet holding component 15.

[0051] A groove 22a is formed on the upper surface of the second blade member 22, into which the protrusions 21e of each of the ten blades 21a enter. That is, ten grooves 22a are formed on the upper surface of the second blade member 22. The groove 22a is recessed toward the lower side. The shape of the groove 22a is a shape corresponding to the shape of the protrusion 21e, and the shape of the groove 22a when viewed from the upper and lower directions is a curved shape. A positioning hole 22b is formed in the groove 22a, into which the positioning pin 21f is inserted. The positioning hole 22b is recessed from the bottom surface of the groove 22a toward the lower side.

[0052] In addition, a plurality of gate marks (gate spots) 22c are formed on the upper surface of the second blade member 22. The gate marks 22c are marks of the inflow port of the resin when the magnet holding member 15 and the second blade member 22 are integrally formed by injection molding using a mold (i.e., marks of the gate of the mold). That is, in the mold for integrally forming the magnet holding member 15 and the second blade member 22, a plurality of gates are formed at a portion corresponding to the upper surface of the second blade member 22, and when the magnet holding member 15 and the second blade member 22 are integrally formed, the resin flows in from the upper side of the second blade member 22. The plurality of gate marks 22c are arranged along the circumferential direction of the rotor 5.

[0053] In this embodiment, five gate marks 22c are formed on the upper surface of the second blade member 22. That is, the gate marks 22c, which are half the number of the blades 21a of the first blade member 21, are formed on the upper surface of the second blade member 22. The five gate marks 22c are formed at equal intervals in the circumferential direction of the rotor 5. In addition, the five gate marks 22c are formed at the same position in the radial direction of the rotor 5.

[0054] like Figure 4 As shown, five gate marks 22c are formed at the middle positions of two grooves 22a adjacent to each other in the circumferential direction of the rotor 5. That is, five gate marks 22c are formed at the middle positions of two blades 21a adjacent to each other in the circumferential direction of the rotor 5. In this embodiment, five gate marks 22c are formed at the center positions of two blades 21a adjacent to each other in the circumferential direction of the rotor 5. Two grooves 22a are arranged between the gate marks 22c in the circumferential direction of the rotor 5 (that is, between two grooves 22a adjacent to each other in the circumferential direction of the rotor 5). That is, two blades 21a (even-numbered blades 21a) are arranged between the gate marks 22c in the circumferential direction of the rotor 5.

[0055] The five gate marks 22c are arranged at positions further outward than the outer peripheral surface of the second tube portion 15b in the radial direction of the rotor 5 (see Figure 4). That is, the five gate marks 22c are arranged at a position closer to the outside of the radial direction of the rotor 5 than the outer peripheral surface of the portion of the magnet holding member 15 connected to the second blade member 22. In addition, the five gate marks 22c are formed in the middle position of the second blade member 22 in the radial direction of the rotor 5. Specifically, the five gate marks 22c are formed at the center position of the second blade member 22 in the radial direction of the rotor 5.

[0056] The ten blades 21a are fixed to the upper surface side of the second blade member 22. Specifically, the protrusion 21e entering the groove 22a is welded to the groove 22a by ultrasonic welding or the like. A protrusion 21g for welding is formed on the protrusion 21e before being fixed to the groove 22a (see Figure 3 ). The protrusion 21g protrudes downward from the lower surface of the protrusion 21e. In this embodiment, the protrusion 21e is fixed to the groove portion 22a by welding in a range outside the gate mark 22c in the radial direction of the rotor 5. Therefore, the protrusion 21g is formed in a range outside the gate mark 22c in the radial direction of the rotor 5. In addition, when the protrusion 21e is welded to the groove portion 22a, the molten resin accumulates in the groove portion 22a. The groove portion 22a has the function of preventing the resin that is melted and solidified during welding from adhering to the upper surface of the second blade member 22.

[0057] (Main effect of this method)

[0058] As described above, in this embodiment, the lower end portion of the blade 21a, i.e., the protrusion 21e, is fixed to the groove portion 22a of the second blade member 22. In addition, in this embodiment, the five gate marks 22c formed on the upper surface of the second blade member 22 are respectively formed at the middle position of the circumferential direction of the rotor 5 between two adjacent groove portions 22a in the circumferential direction of the rotor 5, and two groove portions 22a are arranged between the gate marks 22c in the circumferential direction of the rotor 5. Therefore, in this embodiment, it is easy to form a welded portion between the groove portions 22a in the circumferential direction of the rotor 5. That is, in this embodiment, it is difficult to form a welded portion in the portion of the second blade member 22 to which the blade 21a is fixed (i.e., the groove portion 22a). Therefore, in this embodiment, it is possible to suppress the formation of a welded portion in the portion of the second blade member 22 to which the blade 21a is fixed.

[0059] In this embodiment, five gate marks 22c are arranged at a position outside the outer peripheral surface of the second barrel portion 15b in the radial direction of the rotor 5. Therefore, in this embodiment, when the magnet holding component 15 and the second blade component 22 are integrally manufactured by injection molding, the resin that has just flowed in from the gate of the mold flows only in the radial direction of the rotor 5. Therefore, in this embodiment, the flow of the resin formed in the second blade component 22 can be simplified, and as a result, the flow of the resin formed in the second blade component 22 can be easily controlled. Therefore, in this embodiment, when the magnet holding component 15 and the second blade component 22 are integrally manufactured by injection molding, the flow of the resin can be controlled in a manner that a weld portion is formed in a portion of the second blade component 22 that deviates from the portion where the blade 21a is fixed. Therefore, in this embodiment, the formation of a weld portion in the portion of the second blade component 22 where the blade 21a is fixed can be effectively suppressed.

[0060] In addition, when the five gate marks 22c are arranged at a position closer to the inside than the outer peripheral surface of the second barrel portion 15b in the radial direction of the rotor 5, when the magnet holding part 15 and the second blade part 22 are manufactured integrally by injection molding, the resin just flowing in from the gate of the mold flows in the radial and axial directions of the rotor 5, and thus the flow of the resin formed in the second blade part 22 becomes complicated.

[0061] Therefore, in this case, it is difficult to control the flow of the resin formed in the second blade component 22. As a result, when the magnet holding component 15 and the second blade component 22 are manufactured integrally by injection molding, it is difficult to control the flow of the resin in a manner that forms a weld portion at a portion of the second blade component 22 that deviates from the portion to which the blade 21a is fixed.

[0062] In this embodiment, five gate marks 22c are formed at the same position in the radial direction of the rotor 5. Therefore, in this embodiment, the flow of the resin formed in the second blade member 22 is simplified and it is easier to control the flow of the resin formed in the second blade member 22. Therefore, in this embodiment, it is possible to more effectively suppress the formation of a welded portion in the portion of the second blade member 22 to which the blade 21a is fixed.

[0063] In this embodiment, five gate marks 22c are formed at the middle position of the second blade member 22 in the radial direction of the rotor 5. Therefore, in this embodiment, the distance that the resin formed in the second blade member 22 flows in the radial direction of the rotor 5 can be shortened. Therefore, in this embodiment, the flow of the resin formed in the second blade member 22 is simplified, and the flow of the resin formed in the second blade member 22 is more easily controlled. As a result, in this embodiment, the formation of a welded portion in the portion of the second blade member 22 to which the blade 21a is fixed can be more effectively suppressed.

[0064] In this embodiment, the fluid pressure acting on the outer peripheral portion of the impeller 2 is higher than the fluid pressure acting on the inner peripheral portion of the impeller 2. However, since the protrusion 21e, which is the lower end of the blade 21a, is fixed to the groove portion 22a by welding in the range outside the gate mark 22c in the radial direction of the rotor 5, the fixing strength between the blade 21a and the second blade member 22 can be improved in the outer peripheral portion of the impeller 2. Therefore, in this embodiment, even if the fluid pressure acting on the outer peripheral portion of the impeller 2 becomes high, it is possible to prevent the blade 21a from being separated from the second blade member 22.

[0065] (Other embodiments)

[0066] The above-described embodiment is an example of a preferred embodiment of the present invention, but the present invention is not limited thereto and can be variously modified without departing from the spirit of the present invention.

[0067] In the above-mentioned manner, a plurality of gate marks 22c less than four may be formed on the upper surface of the second blade member 22. Figure 5A As shown in FIG. 1 , four gate marks 22c may be formed on the upper surface of the second blade member 22. In this case, the four gate marks 22c are not formed at equal intervals in the circumferential direction of the rotor 5, and there are portions where two blades 21a are arranged and portions where four blades 21a are arranged between the gate marks 22c in the circumferential direction of the rotor 5. Figure 5A In the figure, the positioning hole 22b and the like are omitted.

[0068] In the above-mentioned embodiment, the number of blades 21a included in the first blade member 21 may be an even number of 12 or more. For example, the number of blades 21a included in the first blade member 21 may be 12. In this case, for example, six gate marks 22c are formed at equal intervals in the circumferential direction of the rotor 5, and two blades 21a are arranged between the gate marks 22c in the circumferential direction of the rotor 5.

[0069] In addition, in this case, if Figure 5B As shown, three gate marks 22c may be formed on the upper surface of the second blade member 22. The three gate marks 22c are formed at equal intervals in the circumferential direction of the rotor 5, and four blades 21a are arranged between the gate marks 22c in the circumferential direction of the rotor 5. Even in this case, it is easy to form a welded portion between the grooves 22a in the circumferential direction of the rotor 5, so it is possible to suppress the formation of a welded portion in the portion of the second blade member 22 to which the blades 21a are fixed. In addition, Figure 5B In the figure, the positioning hole 22b and the like are omitted.

[0070] In addition, in the above-mentioned embodiment, the number of blades 21a of the first blade member 21 may be 4, 6, or 8. For example, when the number of blades 21a of the first blade member 21 is 6, three gate marks 22c are formed at equal intervals in the circumferential direction of the rotor 5, and two blades 21a are arranged between the gate marks 22c in the circumferential direction of the rotor 5. In addition, when the number of blades 21a of the first blade member 21 is 8, four gate marks 22c may be formed at equal intervals in the circumferential direction of the rotor 5, and two blades 21a may be arranged between the gate marks 22c in the circumferential direction of the rotor 5, or two gate marks 22c may be formed at 180° intervals in the circumferential direction of the rotor 5, and four blades 21a may be arranged between the gate marks 22c in the circumferential direction of the rotor 5.

[0071] In the above-mentioned embodiment, the gate mark 22c may be formed at a substantially central position slightly deviated from the central position of the second blade member 22 in the radial direction of the rotor 5. In addition, the gate mark 22c may be formed at a position deviated from the middle position of the second blade member 22 in the radial direction of the rotor 5. That is, the gate mark 22c may be formed at a position greatly deviated from the central position of the second blade member 22 in the radial direction of the rotor 5. In addition, in the above-mentioned embodiment, the five gate marks 22c may not be formed at the same position in the radial direction of the rotor 5.

[0072] In the above-mentioned embodiment, the five gate marks 22c may be respectively formed at the approximate center positions of two blades 21a adjacent to each other in the circumferential direction of the rotor 5, slightly deviated from the center position in the circumferential direction of the rotor 5. In addition, in the above-mentioned embodiment, the shape of the blade 21a when viewed from the top and bottom direction may be linear. That is, the ten blades 21a may be formed in a radial shape. Moreover, in the above-mentioned embodiment, the groove portion 22a may not be formed on the upper surface of the second blade member 22.

[0073] (Structure of this technology)

[0074] Furthermore, the present technology can adopt the following structures.

[0075] (1) A pump device, wherein:

[0076] The invention comprises: an electric motor having a rotor and a stator; and an impeller rotating together with the rotor,

[0077] The rotor includes a cylindrical drive magnet and a cylindrical resin magnet holding member to which the drive magnet is attached on the outer circumference side.

[0078] The impeller comprises: a first blade member made of resin, which has an even number of blades of 4 or more arranged at a constant pitch in the circumferential direction of the rotor; and a second blade member made of resin, which is formed separately from the first blade member and fixes the first blade member.

[0079] The axial direction of the cylindrical magnet holding member coincides with the axial direction of the rotor.

[0080] When one side of the axial direction of the rotor is set as a first direction side and the opposite side of the first direction side is set as a second direction side,

[0081] The second blade member is formed integrally with the magnet holding member by injection molding, and is formed in a flange shape extending from a first direction end of the magnet holding member toward the radially outer side of the rotor.

[0082] A plurality of blades are fixed on the first direction side of the second blade component,

[0083] A plurality of gate marks are formed on a surface of the second blade member on the first direction side, the plurality of gate marks are arranged at a position radially outside the rotor relative to an outer peripheral surface of a portion of the magnet holding member connected to the second blade member, and are arranged in a circumferential direction of the rotor.

[0084] The plurality of gate marks are respectively formed at the middle positions of two blades adjacent to each other in the circumferential direction of the rotor,

[0085] An even number of the blades are arranged between the gate marks in the circumferential direction of the rotor.

[0086] (2) The pump device according to (1), wherein the plurality of gate marks are formed at the same position in the radial direction of the rotor.

[0087] (3) The pump device according to (1) or (2), wherein a plurality of the gate marks are formed at intermediate positions of the second blade member in a radial direction of the rotor.

[0088] (4) The pump device according to any one of (1) to (3), wherein the plurality of gate marks are formed at equal intervals in the circumferential direction of the rotor.

[0089] (5) The pump device according to (4), wherein the gate traces are formed on the second blade member in a number half the number of the blades included in the first blade member.

[0090] (6) The pump device according to (5), wherein the first blade member has ten blades, and five gate marks are formed on the second blade member.

[0091] (7) The pump device according to any one of (5) to (6), wherein:

[0092] A groove portion is formed on the surface of the second blade member on the first direction side, into which the ends of the plurality of blades on the second direction side enter.

[0093] An end portion of the blade on the second direction side is fixed to the groove portion by welding within a range outside the gate mark in the radial direction of the rotor.

Claims

1. A pump device, characterized in that: The invention comprises: an electric motor having a rotor and a stator; and an impeller rotating together with the rotor, The rotor includes a cylindrical drive magnet and a cylindrical resin magnet holding member to which the drive magnet is attached on the outer circumference side. The impeller comprises: a first blade member made of resin, which has an even number of blades of 4 or more arranged at a constant pitch in the circumferential direction of the rotor; and a second blade member made of resin, which is formed separately from the first blade member and fixes the first blade member. The axial direction of the cylindrical magnet holding member coincides with the axial direction of the rotor. When one side of the axial direction of the rotor 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 formed integrally with the magnet holding member by injection molding, and is formed in a flange shape extending from a first direction end of the magnet holding member toward the radially outer side of the rotor. A plurality of blades are fixed to the first direction side of the second blade member, A plurality of gate marks are formed on a surface of the second blade member on the first direction side, the plurality of gate marks being arranged at a position radially outward of the rotor relative to an outer peripheral surface of a portion of the magnet holding member connected to the second blade member, and being arranged in a circumferential direction of the rotor, The plurality of gate marks are respectively formed at intermediate positions in the circumferential direction of the rotor and between two blades adjacent to each other in the circumferential direction of the rotor. An even number of the blades are arranged between the gate marks in the circumferential direction of the rotor.

2. The pump device according to claim 1, characterized in that The plurality of gate marks are formed at the same position in the radial direction of the rotor.

3. The pump device according to claim 1 or 2, characterized in that A plurality of the gate marks are formed at intermediate positions of the second blade member in a radial direction of the rotor.

4. The pump device according to claim 1 or 2, characterized in that The plurality of gate marks are formed at equal intervals in the circumferential direction of the rotor.

5. The pump device according to claim 4, characterized in that The second blade member is provided with the gate traces, the number of which is half the number of the blades included in the first blade member.

6. The pump device according to claim 5, characterized in that The first blade component has 10 blades, and the second blade component has five gate marks formed thereon.

7. The pump device according to claim 1 or 2, characterized in that A groove portion is formed on the surface of the second blade member on the first direction side, into which the ends of the plurality of blades on the second direction side enter. An end portion of the blade on the second direction side is fixed to the groove portion by welding within a range outside the gate mark in the radial direction of the rotor.

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