CN113958512B - Pump device - Google Patents

Abstract

A pump device capable of achieving high positional accuracy between a stator and a resin sealing member. In the pump device (1), a first opening (636) is formed in a resin sealing member (60) covering a stator (3), and reaches at least a part of the outer peripheral surface (311 a) of a ring part (311) and an end surface (311 b) of the ring part of a stator core (31) from a bottom wall part (63) of the resin sealing member. Therefore, when the resin sealing member is molded, the stator can be positioned in the mold by directly abutting the positioning member against the outer peripheral surface (311 a) and the end surface (311 b) of the annular portion (311) of the stator core (31) at a position corresponding to the first opening. Further, a protrusion (645) protruding radially outward is formed on a region of the side wall portion (64) of the resin sealing member, which overlaps a part of the outer peripheral surface (311 a) of the annular portion reaching the first opening portion from the radially outward side.

Description

Pump device

Technical Field

The present invention relates to a pump device in which a stator is covered with a resin sealing member.

Background

In the pump device, an impeller disposed in a pump chamber is rotated by a motor. In a stator of an electric motor, a stator core includes an annular portion and a plurality of salient pole portions protruding inward from the annular portion in a radial direction, and a coil is wound around the salient pole portions via an insulator. The stator has a resin sealing member formed in such a manner as to cover the coil or the like by insert molding. In the resin sealing, the stator is positioned by the positioning member through the insulator in the mold. Therefore, in the resin sealing member, the portion where the positioning member is disposed is an opening (see patent document 1).

Prior art literature

Patent literature

Patent document 1: japanese patent application laid-open No. 2018-166365

Disclosure of Invention

Technical problem to be solved by the invention

In the technique described in patent document 1, since the insulator is made of resin, the insulator may be deformed when the stator is positioned by the positioning member via the insulator. In addition, misalignment may occur between the insulator and the stator core. Therefore, in the structure in which the stator core is positioned via the insulator at the time of resin sealing, the positional accuracy between the stator and the resin sealing member may be lowered.

In view of the above, an object of the present invention is to provide a pump device capable of obtaining high positional accuracy between a stator and a resin sealing member.

Technical proposal adopted for solving the technical problems

In order to solve the above-described problems, the present invention provides a pump device including a motor and an impeller disposed on one side of a rotation center axis with respect to the motor, the motor including: a cylindrical stator; a rotor having the impeller connected to an end portion of the radial inner side facing the stator and on one side of the rotation center axis; and resin sealing members that cover the stator from both sides in a radial direction and both sides in a rotation center axis direction, the stator having: a stator core having a ring portion and a salient pole protruding radially inward from the ring portion; an insulator covering at least the protruding electrode; and a coil wound around the protrusion via the insulator, wherein the resin sealing member has a first opening portion extending from a bottom wall portion to at least one of a part of an outer peripheral surface of the annular portion and a part of an end surface of the annular portion on the other side of the rotation center axis, and the bottom wall portion covers the stator from the other side of the rotation center axis.

In the present invention, since the resin sealing member covering the stator is provided with the first opening portion extending from the bottom wall portion to at least one of the part of the outer peripheral surface of the annular portion of the stator core and the part of the end surface of the other side of the rotation center axis of the annular portion, the stator can be positioned in the mold by directly abutting the positioning member against the stator core at a position corresponding to the first opening portion when the resin sealing member is molded. Therefore, high positional accuracy can be obtained between the stator and the resin sealing member.

In the present invention, the following manner may be adopted: the first opening portion extends from the bottom wall portion to at least a part of an outer peripheral surface of the annular portion.

In the present invention, the following manner may be adopted: the first opening portion extends from the bottom wall portion to both a part of the outer peripheral surface of the annular portion and a part of the end surface.

In the present invention, the following manner may be adopted: the resin sealing member includes a protrusion protruding radially outward from a region overlapping a part of an outer peripheral surface of the annular portion reaching from the first opening portion from the radial direction outward, the protrusion covering a side wall portion of the stator from the radial direction outward. According to this aspect, a sufficient thickness can be ensured even in the portion where the first opening is provided in the side wall portion.

In the present invention, the following manner may be adopted: the first opening portions are provided at a plurality of positions in the circumferential direction.

In the present invention, the following manner may be adopted: the resin sealing member has a second opening portion that reaches a part of the end surface from the bottom wall portion without reaching an outer peripheral surface of the annular portion.

In the present invention, the following manner may be adopted: the insulator includes a flange portion overlapping the annular portion from the other side in the rotation center axis direction, a recess recessed inward in a radial direction is provided in an outer peripheral surface of the flange portion, and the first opening and the second opening are respectively provided at angular positions overlapping the recess.

In the present invention, the following manner may be adopted: the second opening portions are provided at a plurality of positions in the circumferential direction.

In the present invention, the following manner may be adopted: the stator core includes a welded portion connecting circumferentially extending portions to each other, and the resin sealing member is in contact with the welded portion from the radially outer side.

In the present invention, the following manner may be adopted: the resin sealing member has a gate mark on one side of the rotational center axis.

In the present invention, the following manner may be adopted: the partition wall portion constituting the bottom of the pump chamber in which the impeller is disposed in the resin sealing member includes a conical surface inclined so that a radially outer portion is positioned closer to the pump chamber than a radially inner portion, and the resin sealing member has the gate mark on the conical surface.

Effects of the invention

In the present invention, since the resin sealing member covering the stator is provided with the first opening portion extending from the bottom wall portion to at least one of the part of the outer peripheral surface of the annular portion of the stator core and the part of the end surface of the other side of the rotation center axis of the annular portion, the stator can be positioned in the mold by directly abutting the positioning member against the stator core at a position corresponding to the first opening portion when the resin sealing member is molded. Therefore, high positional accuracy can be obtained between the stator and the resin sealing member.

Drawings

Fig. 1 is a perspective view showing an embodiment of a pump device to which the present invention is applied.

Fig. 2 is a longitudinal sectional view of the pump device shown in fig. 1.

Fig. 3 is an exploded perspective view of the pump device shown in fig. 1.

Fig. 4 is an explanatory view of the stator and the like shown in fig. 2.

Fig. 5 is a perspective view of the stator shown in fig. 2, viewed from the other side in the direction of the rotation center axis.

Fig. 6 is an exploded perspective view of the insulator or the like shown in fig. 4.

Fig. 7 is a bottom view of the stator sealed by the resin sealing member shown in fig. 4, as seen from the other side in the rotation center axis direction.

Fig. 8 is a cross-sectional view of the stator sealed by the resin sealing member shown in fig. 4, cut in a direction orthogonal to the rotation center axis.

Fig. 9 is a longitudinal sectional view taken along the rotation center axis and taken along the vicinity of the first opening of the stator sealed by the resin sealing member shown in fig. 4.

Description of the reference numerals

1 … pump device; 2 … shell; 3 … stator; a 4 … rotor; 5 … magnets; 6 … partition wall members; 7 … fulcrum; 10 … motor; 20 … pump chambers; 25 … impeller; 31 … stator core; 32 … insulator; 33 … coil; 60 … resin sealing member; 61 … first partition wall portions; 62 … second partition wall portions; 63 … bottom wall portions; 64 … side wall portions; 65 … shaft holes; 66 … conical surface; 67 … annular peripheral region; 311a … outer circumferential surface; 311b … end face; 312 … protruding poles; 313 … body part; a front end portion of 314 …;321 … first part; 321a, 322a … resin members; 321e, 322e … first flange portions; 321f, 322f … second flange portions; 321h … recess; 322 … second part; 636 … first opening portion; 637 … second opening portions; 639 … opening portions; g0 … gate mark; l … rotation central axis.

Detailed Description

Next, a pump device according to an embodiment of the present invention will be described with reference to the drawings. In the following description, the direction of the rotation center axis L refers to the direction in which the rotation center axis L extends, and the radial direction inside and outside the radial direction refer to the radial direction centered on the rotation center axis L.

(integral structure)

Fig. 1 is a perspective view showing an embodiment of a pump device 1 to which the present invention is applied. Fig. 2 is a longitudinal sectional view of the pump device 1 shown in fig. 1. Fig. 3 is an exploded perspective view of the pump device 1 shown in fig. 1. In fig. 1, 2 and 3, the pump device 1 includes: a casing 2 having a suction port 21a and a discharge port 22 a; a motor 10 including a stator 3 and a rotor 4; and an impeller 25 connected to an end of one side L1 of the rotor 4 in the direction of the rotation center axis L. The impeller 25 is disposed in the pump chamber 20 provided on one side L1 in the direction of the rotation center axis L with respect to the motor 10. The stator 3 has a cylindrical shape. The motor 10 includes a resin partition member 6 covering the stator 3 and a shaft 7 rotatably supporting the rotor 4. The support shaft 7 is made of metal or ceramic. In the pump device 1 of the present embodiment, the fluid is a liquid, and the pump device 1 is used under conditions in which the ambient temperature and the fluid temperature are liable to change.

The housing 2 constitutes a wall surface 23 of one side L1 of the pump chamber 20 in the direction of the rotation center axis L, and a side wall 29 extending in the circumferential direction. The housing 2 includes a suction pipe 21 extending along the rotation center axis L and a discharge pipe 22 extending in a direction orthogonal to the rotation center axis L, and the suction pipe 21 and the discharge pipe 22 include a suction port 21a and a discharge port 22a at end portions thereof, respectively. The suction pipe 21 and the suction port 21a are concentric with respect to the rotation center axis L.

In the motor 10, the stator 3 includes a stator core 31 and a coil 33 wound around the stator core 31 via an insulator 32. The stator core 31 includes a ring portion extending in a ring shape and a plurality of protruding poles protruding radially inward from the ring portion, which will be described later in detail. The coil 33 is wound between a first flange portion on the radially inner side and a second flange portion on the radially outer side of the insulator 32 covering the salient poles. In the present embodiment, the motor 10 is a three-phase motor, and the coil 33 includes a U-phase coil, a V-phase coil, and a W-phase coil.

The rotor 4 includes a cylindrical portion 40 extending from a position facing the stator 3 radially inward toward the pump chamber 20 along the rotation center axis L, and the cylindrical portion 40 opens into the pump chamber 20. The cylindrical portion 40 is concentric with the suction pipe 21 and the suction port 21 a.

A cylindrical magnet 5 is held on the outer peripheral surface of the cylindrical portion 40 so as to face the stator 3 radially inward. In this embodiment, the rotor 4 is formed with a circular ring portion 41 overlapping the magnet 5 from one side L1 in the direction of the rotation central axis L, and an annular convex portion 42 protruding from the outer edge of the circular ring portion 41 to the other side L2 in the direction of the rotation central axis L, and the convex portion 42 covers the end portion of the one side L1 in the direction of the rotation central axis L of the magnet 5 from the radially outer side. Corresponding to this configuration, an annular portion 51 overlapping the annular portion 41 on the inner side of the convex portion 42 and an annular concave portion 52 recessed toward the other side L2 in the rotation center axis L direction on the outer side of the annular portion 51 in the radial direction are formed at the end portion of one side L1 in the rotation center axis L direction of the magnet 5, and the convex portion 42 overlaps the concave portion 52. At this time, an adhesive is applied between the magnet 5 and the rotor 4, and the magnet 5 and the rotor 4 are bonded. The magnet 5 is, for example, a neodymium magnet. A ring 15 for preventing cracks or the like of the magnet 5 is attached to a surface of the magnet 5 opposite to the pump chamber 20.

In the rotor 4, a disk-shaped flange 45 is formed at an end portion of one side L1 of the cylindrical portion 40 in the direction of the rotation center axis L, and the disk 26 is connected to the flange 45 from the one side L1 of the rotation center axis L. A center hole 260 is formed in the center of the disk 26, and a plurality of blade portions 261 are formed at equal angular intervals on a surface of the disk 26 facing the flange portion 45, and the plurality of blade portions 261 are curved in an arc shape from the periphery of the center hole 260 and extend radially outward. A convex portion 262 protruding toward the flange portion 45 is formed on each of the plurality of blade portions 261.

A groove 451 into which the flange 45-side end of the blade 261 is fitted is formed in the flange 45, and a hole 452 into which the projection 262 is fitted is formed in the bottom of the groove 451. Therefore, when the disk 26 is overlapped and fixed to the flange portion 45 in such a manner that the convex portion 262 is fitted into the hole 452, the flange portion 45 and the disk 26 constitute the impeller 25 connected to the cylindrical portion 40 of the rotor 4. In this embodiment, the disk 26 is inclined so that the radially outer side is positioned closer to the flange 45 than the radially inner side. Therefore, the interval between the disk 26 and the flange portion 45 is narrower on the radially outer side than on the radially inner side.

In the rotor 4, a cylindrical radial bearing 11 is held radially inward of the cylindrical portion 40 by caulking or the like, and the rotor 4 is rotatably supported by the support shaft 7 via the radial bearing 11. As will be described later, the support shaft 7 is held by the partition member 6.

The partition member 6 has a first partition portion 61 constituting the bottom wall 24 of the pump chamber 20 facing the wall surface 23, and a second partition portion 62 interposed between the stator 3 and the magnet 5. In the present embodiment, the partition wall member 6 is a resin sealing member 60 covering the stator 3 from both sides in the radial direction and both sides in the direction of the rotation center axis L, and is a resin portion when the stator 3 is insert molded by polyphenylene sulfide (PPS: polyphenylene Sulfide) or the like.

In this embodiment, the cover 18 is fixed to the resin sealing member 60 from the other side L2 in the direction of the rotation center axis L, and the substrate 19 is disposed between the cover 18 and the resin sealing member 60, and the substrate 19 is provided with a circuit or the like for controlling the power supply to the coil 33. A connector housing 69 is formed on the partition member 6. Therefore, if a connector is connected to the connector housing 69 to supply power or the like, the rotor 4 rotates about the rotation center axis L. As a result, when the impeller 25 rotates in the pump chamber 20, the inside of the pump chamber 20 becomes negative pressure, and therefore, fluid is sucked into the pump chamber 20 from the suction pipe 21 and discharged from the discharge pipe 22.

(detailed structure of the cylindrical portion 40 of the rotor 4 and the like)

In the motor 10 of this embodiment, the cylindrical portion 40 of the rotor 4 is provided with a through hole 44 between the portion holding the magnet 5 and the impeller 25. Therefore, when the impeller 25 rotates, a part of the fluid flows from the pump chamber 20 into the cylindrical portion 40 of the rotor 4, passes through the through-hole 44 of the cylindrical portion 40, and flows again to the pump chamber 20 along the bottom wall 24. Thus, the air mixed in the fluid returns to the pump chamber 20. In this embodiment, the through-hole 44 is provided at two positions offset from each other by 180 degrees in the angular position in the cylindrical portion 40.

In the pump chamber 20, the bottom wall 24 formed by the first partition wall portion 61 of the partition wall member 6 has a conical surface 66 on the radially outer side of the through hole 44, and the conical surface 66 is inclined so that the radially outer portion is located closer to the pump chamber 20 than the radially inner portion. Therefore, the pressure of the fluid flowing from the through-hole 44 toward the pump chamber 20 along the bottom wall 24 is high, and therefore, even when foreign matter is mixed in the fluid, the foreign matter easily flows into the pump chamber 20. Therefore, the foreign matter can be restrained from moving from the pump chamber 20 to between the magnet 5 held by the rotor 4 and the second partition wall portion 62. Therefore, foreign matter is less likely to be trapped between the magnet 5 and the second partition wall 62, which prevents the rotor 4 from rotating.

In accordance with this configuration, an imaginary line P that linearly connects the pump chamber 20-side end portion of the first flange portion 322e on the radial inner side of the insulator 32 and the pump chamber 20-side end portion of the second flange portion 322f on the radial outer side of the insulator 32 is inclined along the conical surface 66 with respect to the rotation center axis L. In this embodiment, the angle θ between the conical surface 66 and the rotation center axis L is 45 degrees or more and 65 degrees or less.

The bottom wall 24 includes an annular outer peripheral region 67 orthogonal to the rotation center axis L on the outer peripheral side of the conical surface 66. In this embodiment, the conical surface 66 overlaps with the impeller 25 from a position halfway in the radial direction to a position slightly inside the outer edge, and the annular outer peripheral region 67 is formed to protrude radially outward from the outer edge of the impeller 25. Therefore, the outer peripheral portion of the annular outer peripheral region 67 is not opposed to the impeller 25, but is directly overlapped with the pump chamber 20. Therefore, on the outer peripheral side of the bottom wall 24, the fluid can smoothly flow out to the pump chamber 20 through the outer peripheral side of the impeller 25.

(fixing Structure of support shaft 7)

As shown in fig. 2, the partition member 6 is formed with a shaft hole 65 into which a first end 71 of the support shaft 7 opposite to the pump chamber 20 is fitted. In contrast, a receiving portion 280 is formed in the housing 2, and the receiving portion 280 is opposed to the second end 72 of the support shaft 7 on the pump chamber 20 side to limit the movable range of the support shaft 7 toward the pump chamber 20 side.

The shaft hole 65 includes a first hole 651 to which the first end portion 71 is fixed, and a second hole 652 communicating with the first hole 651 on the opposite side of the pump chamber 20, and the second hole 652 engages with the first end portion 71 to prevent rotation of the support shaft 7. In this embodiment, the support shaft 7 is fixed to the partition member 6 by being pushed into the first hole 651.

In the second hole 652, the rotation of the support shaft 7 is prevented by overlapping a flat surface portion formed on the inner peripheral surface of the second hole 652 and a flat surface portion formed on the outer peripheral surface of the support shaft 7. For example, each of the first end portion 71 and the second hole portion 652 is formed in a D-shape in cross section. Therefore, since the flat surface portion 652a of the second hole portion 652 and the flat surface portion 71a of the first end portion 71 overlap, the second hole portion 652 engages with the first end portion 71 to prevent the rotation of the support shaft 7.

The shaft hole 65 is formed in the bottom wall 63 of the partition member 6. The first hole 651 includes an inner portion of the first tube 631 protruding from the bottom wall 63 toward the pump chamber 20, and the second hole 652 is provided in an inner portion of the second tube 632 having a bottom protruding from the bottom wall 63 toward the opposite side of the pump chamber 20. Therefore, in each of the first hole 651 and the second hole 652, an appropriate size can be ensured in the rotation center axis L direction. The bottom wall 63 is provided with a plurality of triangular ribs 635 connected to the outer peripheral surface of the second tube 632. Therefore, even when a large load is applied to the support shaft 7, the second tube portion 632 can receive the load.

Here, the opening edge of the shaft hole 65 on the pump chamber 20 side is an inclined surface inclined obliquely inward so that the opening diameter becomes larger. Therefore, the support shaft 7 can be easily fitted into the shaft hole 65. The wall thickness of the first tube portion 631 is thinner than the wall thickness of the second tube portion 632.

The casing 2 includes three support portions 27 extending from the inner peripheral surface of the suction pipe 21 toward the motor 10. A cylindrical portion 28 in which the support shaft 7 is positioned is formed at an end of the support portion 27, and a receiving portion 280 is formed by a bottom portion of one side L1 of the cylindrical portion 28 in the direction of the rotation center axis L. A gap is provided between the outer peripheral surface of the support shaft 7 and the inner peripheral surface of the cylindrical portion 28. The receiving portion 280 faces the end surface of the support shaft 7 on the second end 72 side with the gap G2 therebetween. Here, the gap G2 between the end surface of the second end portion 72 and the receiving portion 280 is narrower than the dimension G1 of the first end portion 71 located inside the second hole portion 652 in the rotation center axis L direction.

An annular thrust bearing 12 is attached to the second end 72 of the support shaft 7, and the thrust bearing 12 is disposed between the radial bearing 11 and the cylindrical portion 28. Here, the second end 72 of the support shaft 7 and the hole 121 of the thrust bearing 12 are formed in a D-shaped cross section, and the thrust bearing 12 and the support shaft 7 are prevented from rotating.

As described above, in the pump device 1 of the present embodiment, the first end 71 of the support shaft 7 is fixed to the first hole 651 of the shaft hole 65 of the partition wall member 6. Therefore, the support shaft 7 can be held by the partition member 6 without using insert molding which requires a mold having a complicated structure. Further, since the rotation of the support shaft 7 is prevented by the second hole 652 of the shaft hole 65, the support shaft 7 can be held in a stable state by the partition member 6. In addition, since the gap G2 between the end surface of the second end portion 72 and the receiving portion 280 is narrower than the dimension G1 of the first end portion 71 located inside the second hole portion 652 in the rotation center axis L direction, even when the fixation of the fulcrum 7 in the first hole portion 651 is loosened due to the temperature rise and the fulcrum 7 moves to the receiving portion 280 side, the first end portion 71 does not come out from the second hole portion 652. Therefore, the rotation of the support shaft 7 can be prevented. Further, even when the fixation of the support shaft 7 at the first hole portion 651 is loosened due to the temperature rise, if the temperature is lowered, the fixation of the support shaft 7 at the first hole portion 651 becomes firm.

The first hole 651 includes an inner portion of the first tube portion 631 protruding from the bottom wall 63 toward the pump chamber 20, and the second hole 652 is provided in an inner portion of the second tube portion 632 having a bottom, and the second tube portion 632 having a bottom protrudes toward the side opposite to the pump chamber 20 at the bottom wall 63. Therefore, in each of the first hole 651 and the second hole 652, an appropriate dimension can be ensured in the rotation center axis L direction. Further, since the plurality of ribs 635 connected to the outer peripheral surface of the second tube portion 632 are provided in the bottom wall portion 63, even when a large load is applied to the support shaft 7, the second tube portion 632 can receive the load.

Further, since the opening edge of the shaft hole 65 on the pump chamber 20 side is an inclined surface, the support shaft 7 can be easily fitted into the shaft hole 65.

(fixing Structure of housing 2 and partition wall Member 6)

In the pump device 1 of the present embodiment, the casing 2 and the partition wall member 6 are made of resin. Further, since the support shaft 7 is held by the shaft hole 65 of the partition wall member 6, a gap G2 is secured between the support shaft 7 and the receiving portion 280 of the housing 2, and a gap is also secured between the outer peripheral surface of the support shaft 7 and the inner peripheral surface of the tube portion 28. Accordingly, since a play for relatively moving the housing 2 and the partition wall member 6 is secured between the support shaft 7 and the housing 2, the housing 2 and the partition wall member 6 can be fixed by vibration welding in the manufacturing process of the pump device 1.

In vibration welding, the case 2 and the partition wall member 6 are vibrated relatively to perform welding. In this embodiment, in the partition wall member 6, an annular convex portion is provided on one of an end portion of one side L1 in the direction of the rotation center axis L of the cylindrical side wall portion 64 surrounding the stator 3 from the radially outer side and an end portion of the other side L2 in the direction of the rotation center axis L of the side wall 29 of the housing 2, an annular concave portion is provided on the other side, and vibration welding is performed on the convex portion in the concave portion. In this embodiment, an annular convex portion 290 is provided at the end portion of the other side L2 of the side wall 29 in the rotation center axis L direction, an annular concave portion 640 is provided at the end portion of the side wall portion 64 at the one side L1 in the rotation center axis L direction, and vibration welding is performed on the convex portion 290 in the concave portion 640.

(Structure of stator 3)

Fig. 4 is an explanatory view of the stator 3 and the like shown in fig. 2. Fig. 5 is a perspective view of the stator 3 shown in fig. 2 viewed from the other side L2 in the direction of the rotation center axis L. Fig. 6 is an exploded perspective view of the insulator 32 and the like shown in fig. 4.

In fig. 4, 5 and 6, stator core 31 includes annular portion 311 extending in an annular shape and a plurality of protruding poles 312 protruding radially inward from annular portion 311. The stator core 31 is a laminated core formed by laminating thin magnetic plates made of a magnetic material. The outer peripheral surface 311a of the annular portion 311 has a recess 315 extending in the direction of the rotation center axis L, corresponding to the plurality of protruding poles 312. The protruding poles 312 are formed at equal angular intervals, and are arranged at regular intervals in the circumferential direction. The protruding pole 312 includes a main body portion 313 extending in the radial direction and a tip portion 314 extending in an arc shape around the main body portion 313 on both sides in the circumferential direction.

In this embodiment, the stator core 31 is formed by bending a linearly extending member into an annular shape, and then welding the ends of the annular portions 311 to each other. Therefore, stator core 31 includes welded portion 310 connecting portions extending in the circumferential direction to each other at one portion in the circumferential direction of annular portion 311.

The insulator 32 is composed of a first member 321 overlapping the stator core 31 from the other side L2 in the rotation center axis L direction, and a second member 322 overlapping the stator core 31 from the one side L1 in the rotation center axis L direction. The first member 321 and the second member 322 are each configured by disposing resin members 321a and 322a covering each of the plurality of protruding poles 312 in the circumferential direction.

The plurality of resin members 321a each include a cylindrical portion forming portion 321b that covers the protrusion 312 from the other side L2 in the rotation center axis L direction and covers the periphery of the main body portion 313 from three directions, an inner circumferential portion 321c that is bent in the circumferential direction from the radially inner end of the cylindrical portion forming portion 321b, and an outer circumferential portion 321d that is bent in the circumferential direction from the radially outer end of the cylindrical portion forming portion 321 b. The plurality of resin members 321a each include a first flange portion 321e that is bent toward the other side L2 in the direction of the rotation central axis L on the radial direction inside the cylindrical portion forming portion 321b, and a second flange portion 321f that is positioned toward the other side L2 in the direction of the rotation central axis L with respect to the radial direction outside the cylindrical portion forming portion 321b, and the second flange portion 321f overlaps the annular portion 311 of the stator core 31 from the other side L2 in the direction of the rotation central axis L. The second flange 321f has protrusions 321g protruding radially outward at both ends in the circumferential direction, and recesses 321h recessed radially inward between the protrusions 321 g.

The plurality of resin members 322a each include a cylindrical portion forming portion 322b that covers the protrusion 312 from one side L1 in the rotation center axis L direction and covers the periphery of the main body portion 313 from three directions, an inner circumferential portion 322c that is curved in the circumferential direction from the radially inner end of the cylindrical portion forming portion 322b, and an outer circumferential portion 322d that is curved in the circumferential direction from the radially outer end of the cylindrical portion forming portion 322 b. The plurality of resin members 322a each include a first flange portion 322e that is bent on one side L1 in the direction of the rotation center axis L on the radial direction inside of the tube portion forming portion 322b, and a second flange portion 322f that is positioned on one side L1 in the direction of the rotation center axis L with respect to the radial direction outside of the tube portion forming portion 322b, and the second flange portion 322f overlaps the annular portion 311 of the stator core 31 from one side L1 in the direction of the rotation center axis L.

The terminal pin 34 protrudes from the other side L2 of the second flange portion 321f in the rotation center axis L direction, which faces the other side L2 in the rotation center axis L direction. Further, on the outer peripheral surface of the second flange portion 322f, a wire accommodating portion 322i through which the jumper wire 331 extending from the coil 33 passes is extended in the circumferential direction. The wiring accommodation portions 322i are provided in three rows in a direction along the rotation center axis L. Accordingly, the jumper wires 331 extending from the U-phase coil, V-phase coil, and W-phase coil provided as the coil 33 can be respectively passed through the different wiring accommodating portions 322i. The second flange portion 322f is formed with slits 322j at two positions on both sides in the circumferential direction, and can lead out wiring lines led out from both ends of the coil 33 as jumper wires 331 from the inside to the outside in the radial direction, and can be connected to the terminal pins 34.

If the first member 321 and the second member 322 of the insulator 32 configured as described above are overlapped with the stator core 31, the cylindrical portion forming portions 321b, 322b overlap with the main body portion 313 of the salient pole 312 from four directions. Further, the coil 33 is wound around the main body portion 313 of the salient pole 312 via the insulator 32 between the first flange portions 321e and 322e and the second flange portions 321f and 322f and between the inner peripheral side portions 321c and 322c and the outer peripheral side portions 321d and 322d. In this state, the stator core 31 is exposed from the insulator 32 to the radial outside on the outer peripheral surface 311a of the annular portion 311. The outer peripheral portion of the end surface 311c of the annular portion 311 of the stator core 31 on one side in the direction of the rotation center axis L is exposed from the second flange portion 322f of the insulator 32 toward the one side L1 in the direction of the rotation center axis L. The outer peripheral portion of the end surface 311b of the other side L2 of the annular portion in the rotation center axis L direction is exposed from the second flange portion 321f of the insulator 32 toward the other side L2 in the rotation center axis L direction, and in particular, the end surface 311b is exposed in a wide range toward the other side L2 in the rotation center axis L direction in the recess 321h of the insulator 32.

(Structure of resin seal 60)

Fig. 7 is a bottom view of the stator 3 sealed by the resin sealing member 60 shown in fig. 4, as viewed from the other side L2 in the direction of the rotation center axis L. Fig. 8 is a cross-sectional view of the stator 3 sealed by the resin sealing member 60 shown in fig. 4, cut in a direction orthogonal to the rotation center axis L. Fig. 9 is a longitudinal sectional view taken along the rotation center axis L in the vicinity of the first opening 636 of the stator 3 sealed by the resin sealing member 60 shown in fig. 4. In fig. 7, the opening is indicated by a thick line, and the annular portion 311 of the stator core 31 exposed from the opening is indicated by a gray area. In this embodiment, as described below, when the stator 3 is insert-molded in a mold and sealed by the resin sealing member 60, the stator 3 in the mold is positioned using the portion of the stator core 31 exposed from the insulator 32. Accordingly, the resin sealing member 60 has the following opening formed in the bottom wall 63 that covers the stator 3 from the other side L2 in the rotation center axis L direction.

Specifically, as shown by thick lines in fig. 7, a plurality of openings 639 are formed in the bottom wall portion 63, and the plurality of openings 639 include a first opening 636 extending from the bottom wall portion 63 to at least one of a part of the outer peripheral surface 311a of the annular portion 311 of the stator core 31 and a part of the end surface 311b of the other side L2 of the annular portion 311 in the direction of the rotation central axis L. In this embodiment, as shown in fig. 8 and 9, the first opening 636 reaches at least a part of the outer peripheral surface 311a of the annular part 311. That is, the first opening 636 reaches a position overlapping a part of the outer peripheral surface 311a of the annular ring portion 311 radially outward. Therefore, a portion of the outer peripheral surface 311a of the annular portion 311 is in a gap with the resin sealing member 60 in the radial direction through the first opening 636. In this embodiment, the first opening 636 reaches both a part of the outer peripheral surface 311a of the annular part 311 and a part of the end surface 311b of the annular part 311. Therefore, a part of the end surface 311b of the annular portion 311 is exposed from the resin sealing member 60 toward the other side L2 in the rotation center axis L direction through the first opening 636. Here, the first opening 636 is provided at a plurality of portions in the circumferential direction. In this embodiment, the first openings 636 are provided at three positions at equal angular intervals.

In the resin sealing member 60, a protrusion 645 protruding outward in the radial direction is formed in a region overlapping a part of the outer peripheral surface 311a of the annular portion 311 reaching from the first opening 636 from the radial direction outside in the side wall portion 64 covering the stator 3 from the radial direction outside. Therefore, even if the first opening 636 reaching the outer circumferential surface 311a of the annular part 311 of the stator core 31 is provided, the wall thickness of the side wall part 64 can be sufficiently ensured radially outward of the first opening 636.

In this embodiment, the plurality of openings 639 further includes a second opening 637 that does not reach the outer peripheral surface 311a of the annular portion 311 but reaches the end surface 311b of the annular portion 311, and a part of the end surface 311b of the annular portion 311 is exposed from the resin sealing member 60 toward the other side L2 in the rotation center axis L direction through the second opening 637. The second openings 637 are provided at a plurality of positions in the circumferential direction.

Here, the first opening 636 and the second opening 637 are provided at positions corresponding to the recesses 321h formed in the first member 321 of the insulator 32 shown in fig. 6 and the like. Therefore, the annular portion 311 of the stator core 31 is exposed at the other side L2 in the rotation center axis L direction in a large area in the first opening 636 and the second opening 637. However, the first opening 636 and the second opening 637 are provided at positions separated from the welded portion 310 of the stator core 31 in the circumferential direction. Therefore, the resin sealing member 60 covers the welded portion 310 of the stator core 31, and is not exposed from the resin sealing member 60. Therefore, since the welded portion 310 is not in contact with the fluid flowing in the pump chamber 20, rust at the welded portion 310 can be suppressed.

In this embodiment, the insulator 32 is not exposed when viewed from the other side L2 in the rotation center axis L direction.

When the stator 3 is disposed in the mold in forming the resin sealing member 60 having such a structure, the stator 3 is supported by the positioning member from the other side L2 in the rotation center axis L direction at a position corresponding to the opening 639 in the mold, and is positioned in the rotation center axis L direction. The annular portion 311 of the stator core 31 is also supported by the positioning member in the radial direction at a position corresponding to the first opening 636, and is positioned in the radial direction. The pin-shaped member is supported from the other side L2 in the rotation center axis L direction at a position corresponding to the second opening 637, and is positioned in the rotation center axis L direction.

In this state, when the stator 3 is sealed inside the mold, the gate is set on one side L1 of the rotation center axis L of the resin sealing member 60. Therefore, in the resin sealing member 60, the gate mark G0 is present on the surface of the side L1 facing the rotation center axis L. In this embodiment, the gate is set at a position corresponding to the conical surface 66 in the resin sealing member 60. Therefore, a gate mark G0 exists on the conical surface 66. In addition, as a surface of the resin sealing member 60 facing the side L1 of the rotation center axis L, a gate may be set in an annular outer peripheral region 67 located radially outward of the conical surface 66, and in this case, a gate mark may be present in the annular outer peripheral region 67. In addition, at the time of molding the resin sealing member 60, the terminal block 92 supporting the connector terminal 91 shown in fig. 7 is also insert molded together with the stator 3.

(the main effects of the present embodiment)

As described above, in the pump device 1 of the present embodiment, since the first opening 636 extending from the bottom wall 63 to the stator core 31 is provided in the resin sealing member 60 covering the stator 3, the stator 3 can be positioned in the mold by directly abutting the positioning member against the stator core 31 at a position corresponding to the first opening 636 when molding the resin sealing member 60. Therefore, compared with a structure in which the positioning member is brought into contact with the stator core 31 via the insulator 32, high positional accuracy can be obtained between the stator 3 and the resin sealing member 60. In this embodiment, the stator 3 is supported in the radial direction and the rotation center axis L direction by directly abutting the positioning member against the outer peripheral surface 311a and the end surface 311b of the annular portion 311 of the stator core 31 at a position corresponding to the first opening 636, and is positioned in the radial direction and the rotation center axis L direction. Therefore, high positional accuracy can be obtained between the stator 3 and the resin sealing member 60.

Further, since the resin sealing member 60 is provided with the second opening 637 which does not reach the outer peripheral surface 311a of the annular portion 311 but reaches the end surface 311b of the annular portion 311, the stator 3 is supported and positioned in the rotation center axis L direction by directly abutting the positioning member against the end surface 311b of the annular portion 311 of the stator core 31 at a position corresponding to the second opening 637. Therefore, the position of the stator 3 is less likely to deviate due to the pressure when filling resin from the side L1 in the direction of the rotation center axis L. Therefore, high positional accuracy can be obtained between the stator 3 and the resin sealing member 60.

Other embodiments

In the above embodiment, the first opening 636 reaches both of the part of the outer peripheral surface 311a of the annular portion 311 of the stator core 31 and the end surface 311b of the other side L2 in the rotation central axis L direction of the annular portion 311 from the bottom wall portion 63, but the first opening 636 may reach the part of the outer peripheral surface 311a of the annular portion 311 of the stator core 31 from the bottom wall portion 63 and not reach the end surface 311b of the other side L2 in the rotation central axis L direction of the annular portion 311. The first opening 636 may extend from the bottom wall 63 to the end surface 311b of the other side L2 of the annular portion 311 in the direction of the rotation center axis L, and may not extend to a part of the outer circumferential surface 311a of the annular portion 311 of the stator core 31.

Claims (11)

1. A pump device is characterized in that,

comprises a motor and an impeller disposed on one side of a rotation center axis relative to the motor,

the motor is provided with: a cylindrical stator; a rotor having the impeller connected to an end portion of the radial inner side facing the stator and on one side of the rotation center axis; and resin sealing members covering the stator from both sides in a radial direction and both sides in a direction of the rotation center axis,

the stator has: a stator core having a ring portion and a salient pole protruding radially inward from the ring portion; an insulator covering at least the protruding electrode; and a coil wound on the salient pole via the insulator,

the resin sealing member has a first opening portion extending from a bottom wall portion to at least one of a part of an outer peripheral surface of the annular portion and a part of an end surface of the annular portion on the other side of the rotation center axis, and the bottom wall portion covers the stator from the other side of the rotation center axis.

2. A pump apparatus according to claim 1, wherein,

the first opening portion extends from the bottom wall portion to at least a part of an outer peripheral surface of the annular portion.

3. A pump apparatus according to claim 2, wherein,

the first opening portion extends from the bottom wall portion to both a part of the outer peripheral surface of the annular portion and a part of the end surface.

4. A pump apparatus according to claim 2 or 3, wherein,

the resin sealing member includes a protrusion protruding radially outward from a region overlapping a part of an outer peripheral surface of the annular portion reaching from the first opening from the radial outside, the protrusion covering the side wall portion of the stator from the radial outside.

5. A pump apparatus according to any one of claims 1 to 3,

the first opening portions are provided at a plurality of positions in the circumferential direction.

6. A pump apparatus according to any one of claims 1 to 3,

the resin sealing member has a second opening portion that reaches a part of the end surface from the bottom wall portion without reaching an outer peripheral surface of the annular portion.

7. The pump apparatus of claim 6, wherein the pump apparatus comprises a pump unit,

the insulator includes a flange portion overlapping the annular portion from the other side in the rotation center axis direction,

a concave part recessed inward in the radial direction is arranged on the outer peripheral surface of the flange part,

the first opening and the second opening are respectively provided at positions overlapping the recess.

8. The pump apparatus of claim 6, wherein the pump apparatus comprises a pump unit,

the second opening portions are provided at a plurality of positions in the circumferential direction.

9. A pump apparatus according to any one of claims 1 to 3,

the stator core is provided with welding parts for connecting parts extending in the circumferential direction,

the resin sealing member covers the welded portion.

10. A pump apparatus according to any one of claims 1 to 3,

the resin sealing member has a gate mark on one side of the rotational center axis.

11. The pump apparatus of claim 10, wherein the pump apparatus comprises a pump assembly,

the partition wall portion constituting the bottom of the pump chamber in which the impeller is disposed in the resin sealing member has a conical surface inclined so that a radially outer portion is positioned closer to the pump chamber than a radially inner portion,

the resin sealing member has the gate mark at the conical surface.