CN113958512A - Pump device - Google Patents

Abstract

A pump device capable of obtaining high positional accuracy between a stator and a resin sealing member. In a pump device (1), a resin seal member (60) covering a stator (3) is provided with a first opening (636) that reaches at least a part of the outer peripheral surface (311a) of a ring portion (311) and the end surface (311b) of the ring portion of a stator core (31) from the bottom wall portion (63) of the resin seal member. Therefore, when the resin sealing component is molded, the positioning component directly contacts with the outer peripheral surface (311a) and the end surface (311b) of the annular part (311) of the stator core (31) at the position corresponding to the first opening part, so that the stator can be positioned in the die. In addition, a protrusion (645) protruding outward in the radial direction is formed on the side wall portion (64) of the resin sealing member in a region overlapping from the radial direction outer side with a part of the outer peripheral surface (311a) of the annular portion that the first opening portion reaches.

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 radially inward from the annular portion, and a coil is wound around each salient pole portion via an insulator. The stator has a resin sealing member formed to cover the coil or the like by insert molding. In the resin sealing, the stator is positioned by a positioning member via an insulator in a mold. Therefore, in the resin sealing member, a portion where the positioning member is disposed is an opening portion (see patent document 1).

Documents of the prior art

Patent document

Patent document 1: japanese patent laid-open publication 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, a 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 problems, an object of the present invention is to provide a pump device capable of obtaining high positional accuracy between a stator and a resin seal member.

Technical scheme for solving technical problem

In order to solve the above problem, 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 on one side of the rotation central axis, the end portion being opposed to the stator on a radially inner side; and a resin seal member covering the stator from both sides in a radial direction and both sides in the rotational center axis direction, the stator including: a stator core including a ring portion and a salient pole protruding radially inward from the ring portion; an insulator covering at least the salient pole; and a coil wound around the salient pole via the insulator, wherein the resin seal member has a first opening portion reaching 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 from a bottom wall portion covering 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 reaching from the bottom wall portion to at least one of a part of the outer peripheral surface of the annular portion of the stator core and a part of the end surface on the other side of the rotation center axis of the annular portion, when the resin sealing member is molded, the positioning member is brought into direct contact with the stator core at a position corresponding to the first opening portion, whereby the stator can be positioned in the mold. Therefore, high positional accuracy can be obtained between the stator and the resin seal 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 where the protrusion overlaps a part of the outer peripheral surface of the annular portion that is reached from the first opening portion radially outward. According to this aspect, a sufficient thickness can be secured in the side wall portion even at the portion where the first opening is provided.

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 not to the 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 portion recessed radially inward is provided on an outer peripheral surface of the flange portion, and the first opening portion and the second opening portion are provided at angular positions overlapping the recess portion, respectively.

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 weld portion connecting circumferentially extending portions to each other, and the resin seal member is in contact with the weld portion from a 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 rotation center axis.

In the present invention, the following manner may be adopted: the partition wall portion of the resin seal member that forms the bottom portion of the pump chamber in which the impeller is disposed includes a conical surface that is inclined such that a radially outer portion is located closer to the pump chamber than a radially inner portion, and the resin seal 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 reaching from the bottom wall portion to at least one of a part of the outer peripheral surface of the annular portion of the stator core and a part of the end surface on the other side of the rotation center axis of the annular portion, when the resin sealing member is molded, the positioning member is brought into direct contact with the stator core at a position corresponding to the first opening portion, whereby the stator can be positioned in the mold. Therefore, high positional accuracy can be obtained between the stator and the resin seal member.

Drawings

Fig. 1 is a perspective view showing one 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 as viewed from the other side in the direction of the rotation center axis.

Fig. 6 is an exploded perspective view of the insulator and 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 viewed from the other side in the rotational center axis direction.

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

Fig. 9 is a vertical cross-sectional view of the vicinity of the first opening of the stator sealed by the resin sealing member shown in fig. 4, cut along the rotation center axis.

Description of the reference numerals

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

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 a direction in which the rotation center axis L extends, and the radial directions on the radially inner side and the radially outer side refer to radial directions centered on the rotation center axis L.

(Overall Structure)

Fig. 1 is a perspective view showing one 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 housing 2 having an inlet 21a and an outlet 22 a; a motor 10 including a stator 3 and a rotor 4; and an impeller 25 connected to an end portion of one side L1 in the direction of the rotational center axis L of the rotor 4. 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 is cylindrical. The motor 10 includes a resin partition member 6 covering the stator 3 and a support shaft 7 rotatably supporting the rotor 4. The support shaft 7 is made of metal or ceramic. In the pump device 1 of this embodiment, the fluid is a liquid, and the pump device 1 is used under conditions where the ambient temperature and the fluid temperature are likely to change.

The housing 2 constitutes a wall surface 23 of one side L1 in the direction of the rotational center axis L of the pump chamber 20 and a side wall 29 extending in the circumferential direction. The casing 2 includes an intake 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 intake pipe 21 and the discharge pipe 22 include an intake port 21a and a discharge port 22a at respective ends thereof. 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 has 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 salient poles protruding radially inward from the ring portion, as will be described in detail later. 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 coils 33 include 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 radially inward and facing the stator 3 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 on the radially inner side. In this embodiment, the rotor 4 is formed with the annular portion 41 overlapping the magnet 5 from one side L1 in the direction of the rotation center axis L and the annular protrusion 42 protruding from the outer edge of the annular portion 41 to the other side L2 in the direction of the rotation center axis L, and the protrusion 42 covers the end of the magnet 5 on the one side L1 in the direction of the rotation center axis L from the radially outer side. In accordance with this configuration, an annular portion 51 overlapping with the annular portion 41 inside the protruding portion 42 and an annular recessed portion 52 recessed radially outside the annular portion 51 toward the other side L2 in the direction of the rotation center axis L are formed at the end portion of one side L1 in the direction of the rotation center axis L of the magnet 5, and the protruding portion 42 overlaps with the recessed portion 52. At this time, an adhesive is applied between the magnet 5 and the rotor 4 to bond the magnet 5 and the rotor 4. The magnet 5 is, for example, a neodymium magnet. A ring 15 for preventing cracks and the like of the magnet 5 is attached to the 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 of one side L1 in the direction of the rotation center axis L of the cylindrical portion 40, and the disk 26 is connected to the flange 45 from one side L1 in the direction of the rotation center axis L. A central 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 the surface of the disk 26 facing the flange portion 45, the blade portions 261 extending radially outward while being curved in an arc shape from the periphery of the central hole 260. A convex portion 262 protruding toward the flange portion 45 is formed on each of the plurality of blade portions 261.

The flange 45 has a groove 451 into which the end of the blade 261 on the flange 45 side fits, and a hole 452 into which the projection 262 fits is formed in the bottom of the groove 451. Therefore, when the disk 26 is overlappingly fixed to the flange portion 45 so that the convex portion 262 is inserted into the hole 452, the impeller 25 connected to the cylindrical portion 40 of the rotor 4 is constituted by the flange portion 45 and the disk 26. In this embodiment, the disc 26 is inclined so that the radially outer side is positioned closer to the flange portion 45 side than the radially inner side. Therefore, the interval between the disc 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 inside 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 includes a first partition member 61 constituting the bottom wall 24 of the pump chamber 20 facing the wall surface 23, and a second partition member 62 interposed between the stator 3 and the magnet 5. In this embodiment, the partition member 6 is a resin seal member 60 that covers 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 with Polyphenylene Sulfide (PPS) 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, 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. In addition, a connector housing 69 is formed on the partition member 6. Therefore, if a connector is connected to the connector housing 69 for power supply or the like, the rotor 4 rotates about the rotation center axis L. Accordingly, when the impeller 25 rotates in the pump chamber 20, the inside of the pump chamber 20 becomes a negative pressure, and thus fluid is sucked into the pump chamber 20 from the suction pipe 21 and discharged from the discharge pipe 22.

(detailed construction of the cylindrical portion 40 of the rotor 4, etc.)

In the motor 10 of this embodiment, the cylindrical portion 40 of the rotor 4 is provided with a through hole 44 from the portion holding the magnet 5 to 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 into the pump chamber 20 along the bottom wall 24. Therefore, the air mixed in the fluid returns to the pump chamber 20. In this embodiment, the through-hole 44 is provided in the cylindrical portion 40 at two positions angularly displaced from each other by 180 degrees.

In the pump chamber 20, the bottom wall 24 formed by the first partition portion 61 of the partition 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 positioned closer to the pump chamber 20 side 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, foreign matter can be inhibited 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, a situation in which foreign matter is sandwiched between the magnet 5 and the second partition wall 62 and rotation of the rotor 4 is hindered is unlikely to occur.

In accordance with this configuration, an imaginary line P that linearly connects the end portion of the first flange portion 322e on the inner side in the radial direction of the insulator 32 on the pump chamber 20 side and the end portion of the second flange portion 322f on the outer side in the radial direction of the insulator 32 on the pump chamber 20 side is inclined along the conical surface 66 with respect to the rotation center axis L. In the present embodiment, the angle θ formed by 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 perpendicular to the rotation center axis L on the outer peripheral side of the conical surface 66. In this embodiment, the conical surface 66 overlaps the impeller 25 from a position in the middle of the radial direction to a position slightly inside the outer edge, and the annular outer peripheral region 67 is formed to protrude radially outward beyond the outer edge of the impeller 25. Therefore, the outer peripheral portion of the annular outer peripheral region 67 does not face the impeller 25, but directly overlaps the pump chamber 20. Therefore, the fluid can be smoothly discharged to the pump chamber 20 through the outer periphery of the impeller 25 on the outer periphery of the bottom wall 24.

(fixing Structure of fulcrum shaft 7)

As shown in fig. 2, the partition member 6 is provided with a shaft hole 65 into which a first end portion 71 of the support shaft 7 on the opposite side to the pump chamber 20 is fitted. On the other hand, the housing 2 is provided with a receiving portion 280, and the receiving portion 280 faces the second end 72 of the support shaft 7 on the pump chamber 20 side at the pump chamber 20 side to restrict the movable range of the support shaft 7 toward the pump chamber 20 side.

The shaft hole 65 includes a first hole portion 651 to which the first end portion 71 is fixed and a second hole portion 652 communicating with the first hole portion 651 on the side opposite to the pump chamber 20, and the second hole portion 652 is engaged 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 press-fitted into the first hole portion 651.

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

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

The housing 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 with the support shaft 7 positioned inside 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 in the direction of the rotation center axis L of the cylindrical portion 28. A gap is provided between the outer peripheral surface of the support shaft 7 and the inner peripheral surface of the tube portion 28. The receiving portion 280 faces the end surface of the support shaft 7 on the second end 72 side with a 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 in the rotational center axis L direction of the first end portion 71 located inside the second hole portion 652.

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 rotation of the thrust bearing 12 and the support shaft 7 is prevented.

In this way, in the pump device 1 of this embodiment, the first end portion 71 of the support shaft 7 is fixed to the first hole portion 651 of the shaft hole 65 of the partition member 6. Therefore, the support shaft 7 can be held by the partition wall member 6 without using insert molding that requires a mold having a complicated structure. Further, since the rotation of the support shaft 7 is prevented by the second hole portion 652 of the shaft hole 65, the support shaft 7 can be held by the partition member 6 in a stable state. Further, 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 direction of the rotational center axis L, even when the fixing of the support shaft 7 in the first hole portion 651 becomes loose due to a temperature rise and the support shaft 7 moves to the receiving portion 280 side, the first end portion 71 does not come out of the second hole portion 652. Therefore, 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 portion 651 includes an inner portion of a first tube portion 631 projecting from the bottom wall portion 63 toward the pump chamber 20, and the second hole portion 652 is provided in an inner portion of a second tube portion 632 with a bottom, which is formed in the bottom wall portion 63 so as to project toward the side opposite to the pump chamber 20. Therefore, an appropriate dimension can be secured in the direction of the rotation central axis L in each of the first hole portion 651 and the second hole portion 652. Further, since the bottom wall portion 63 is provided with the plurality of ribs 635 connected to the outer peripheral surface of the second cylindrical portion 632, even when a large load is applied to the support shaft 7, the second cylindrical portion 632 can receive the load.

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

(fixing structure of case 2 and partition member 6)

In the pump device 1 of this embodiment, the casing 2 and the partition member 6 are made of resin. Further, since the support shaft 7 is held in the shaft hole 65 of the partition 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. Therefore, since a play for relatively moving the case 2 and the partition member 6 is secured between the support shaft 7 and the case 2, the case 2 and the partition member 6 can be fixed by vibration welding in the manufacturing process of the pump device 1.

In the vibration welding, the case 2 and the partition member 6 are vibrated relatively to be welded. In this embodiment, in the partition 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 of the stator 3 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, which are surrounded from the outside in the radial direction, and an annular concave portion is provided on the other, and the convex portion is vibration-welded in the concave portion. In this embodiment, an annular convex portion 290 is provided at the end of the other side L2 in the direction of the rotational center axis L of the side wall 29, an annular concave portion 640 is provided at the end of the one side L1 in the direction of the rotational center axis L of the side wall 64, and the convex portion 290 is vibration-welded 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 as 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, the stator core 31 includes an annular portion 311 extending in an annular shape and a plurality of salient poles 312 protruding radially inward from the annular portion 311. The stator core 31 is a laminated core formed by laminating thin magnetic plates made of a magnetic material. A recess 315 extending in the direction of the rotation center axis L is formed in the outer peripheral surface 311a of the annular portion 311 in correspondence with the plurality of salient poles 312. The salient poles 312 are formed at equal angular intervals and arranged at a constant interval in the circumferential direction. The salient pole 312 includes a main body portion 313 extending in the radial direction and tip portions 314 extending in an arc shape on both sides in the circumferential direction with the main body portion 313 as the center.

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

The insulator 32 is composed of a first member 321 that overlaps the stator core 31 from the other side L2 in the direction of the rotational center axis L, and a second member 322 that overlaps the stator core 31 from the one side L1 in the direction of the rotational center axis L. The first member 321 and the second member 322 are each configured by resin members 321a and 322a that are disposed in the circumferential direction so as to cover each of the plurality of projecting poles 312.

Each of the plurality of resin members 321a includes a tube-shaped portion 321b that covers the salient pole 312 from the other side L2 in the direction of the rotation center axis L and covers the periphery of the body 313 from three directions, an inner circumferential portion 321c that is bent in the circumferential direction from the radially inner end of the tube-shaped portion 321b, and an outer circumferential portion 321d that is bent in the circumferential direction from the radially outer end of the tube-shaped portion 321 b. The plurality of resin members 321a each have a first flange portion 321e bent toward the other side L2 in the direction of the rotation center axis L on the radially inner side of the cylindrical portion-forming portion 321b, and a second flange portion 321f positioned on the other side L2 in the direction of the rotation center axis L with respect to the radially outer side of 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 center axis L. Protrusions 321g protruding radially outward are formed at both circumferential ends of the second flange portion 321f, and recesses 321h recessed radially inward are formed between the protrusions 321 g.

Each of the plurality of resin members 322a includes a cylindrical portion forming portion 322b that covers the salient pole 312 from one side L1 in the direction of the rotation center axis L and covers the periphery of the body portion 313 from three directions, an inner circumferential portion 322c that is bent in the circumferential direction from the radially inner end of the cylindrical portion forming portion 322b, and an outer circumferential portion 322d that is bent in the circumferential direction from the radially outer end of the cylindrical portion forming portion 322 b. The plurality of resin members 322a each have a first flange portion 322e bent toward the one side L1 in the direction of the rotational center axis L on the radially inner side of the cylindrical portion 322b and a second flange portion 322f positioned on the one side L1 in the direction of the rotational center axis L on the radially outer side of the cylindrical portion 322b, and the second flange portion 322f overlaps the annular portion 311 of the stator core 31 from the one side L1 in the direction of the rotational center axis L.

The terminal pin 34 protrudes from the other side L2 facing the direction of the rotational center axis L of the other side L2 of the direction of the rotational center axis L of the second flange portion 321 f. Further, on the outer peripheral surface of the second flange portion 322f, a wiring housing portion 322i through which the jumper 331 extending from the coil 33 passes is extended in the circumferential direction. The wiring housing 322i is provided in three rows in the direction along the rotation center axis L. Therefore, the jumper 331 extending from each of the U-phase coil, the V-phase coil, and the W-phase coil provided as the coil 33 can be passed through different wire housing portions 322 i. The second flange portion 322f has slits 322j formed at two locations on both sides in the circumferential direction, and wires drawn from both ends of the coil 33 can be drawn from the inside in the radial direction to the outside as jumper wires 331 and connected to the terminal pins 34.

When 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 and 322b are overlapped 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, 322e and the second flange portions 321f, 322f and between the inner peripheral side portions 321c, 322c and the outer peripheral side portions 321d, 322 d. In this state, the stator core 31 is in a state in which the outer peripheral surface 311a of the annular portion 311 is exposed radially outward from the insulator 32. Further, the outer peripheral portion of the end face 311c of the one L1 side in the direction of the rotation center axis L of the annular portion 311 of the stator core 31 is exposed from the second flange portion 322f of the insulator 32 toward the one L1 side in the direction of the rotation center axis L. Further, the outer peripheral portion of the end surface 311b of the other side L2 in the direction of the rotational center axis L of the annular portion is exposed from the second flange portion 321f of the insulator 32 toward the other side L2 in the direction of the rotational center axis L, and particularly, the end surface 311b is exposed in a wide range toward the other side L2 in the direction of the rotational center axis L in the recess 321h of the insulator 32.

(Structure of resin sealing Member 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, taken in a direction orthogonal to the rotation center axis L. Fig. 9 is a vertical cross-sectional view of the vicinity of the first opening 636 of the stator 3 sealed by the resin sealing member 60 shown in fig. 4, cut along the rotation center axis L. In fig. 7, the openings are indicated by thick lines, and the ring portion 311 of the stator core 31 exposed from the openings is indicated by a gray area. In the present 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 is positioned in the mold using the portion of the stator core 31 exposed from the insulator 32. Therefore, in the resin sealing member 60, the following opening is formed in the bottom wall portion 63 covering the stator 3 from the other side L2 in the direction of the rotation center axis L.

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 first openings 636 that extend from the bottom wall portion 63 to at least one of a portion of the outer peripheral surface 311a of the annular portion 311 of the stator core 31 and a portion of the end surface 311b of the other side L2 of the annular portion 311 in the direction of the rotation center 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 portion 311. That is, the first opening 636 reaches a position overlapping a part of the outer peripheral surface 311a of the annular portion 311 on the radially outer side. Therefore, a gap is present between a part of the outer peripheral surface 311a of the annular portion 311 and the resin seal member 60 in the radial direction by the first opening portion 636. In this embodiment, the first opening 636 reaches both a part of the outer peripheral surface 311a of the annular portion 311 and a part of the end surface 311b of the annular portion 311. Therefore, a part of the end surface 311b of the annular portion 311 is exposed from the resin seal member 60 toward the other side L2 in the direction of the rotation center axis L through the first opening 636. Here, the first opening portions 636 are provided at a plurality of locations 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 of the side wall portion 64 covering the stator 3 from the radially outer side, which overlaps with a part of the outer peripheral surface 311a of the annular portion 311 reaching the first opening portion 636 from the radially outer side. Therefore, even if the first opening 636 reaching the outer peripheral surface 311a of the annular portion 311 of the stator core 31 is provided, the wall thickness of the side wall portion 64 can be sufficiently ensured on the radially outer side of the first opening 636.

In this embodiment, the plurality of openings 639 further include 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 seal 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 circumferential positions.

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 to the other side L2 in the rotation center axis L direction with a large area in the first opening portion 636 and the second opening portion 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 does not contact the fluid flowing in the pump chamber 20, rust can be suppressed at the welded portion 310.

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

In forming the resin sealing member 60 configured as described above, when the stator 3 is disposed in the mold, the positioning member supports the stator 3 from the other side L2 in the direction of the rotation center axis L at a position corresponding to the opening 639 in the mold, and the stator is positioned in the direction of the rotation center axis L. The annular portion 311 of the stator core 31 is also radially supported by the positioning member at a position corresponding to the first opening 636, and is radially positioned. Further, at a position corresponding to the second opening 637, the pin-shaped member is supported from the other side L2 in the rotation center axis L direction and positioned in the rotation center axis L direction.

In this state, when the stator 3 is sealed inside the mold, the gate is set to the side L1 on the rotation center axis L of the resin seal member 60. Therefore, in the resin seal member 60, the gate mark G0 is present on a 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, the gate mark G0 exists on the conical surface 66. Further, as a surface facing the one side L1 of the rotation center axis L in the resin seal member 60, a gate may be set in the 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, when the resin sealing member 60 is molded, the terminal block 92 supporting the connector terminal 91 shown in fig. 7 is also insert-molded together with the stator 3.

(main action and Effect of the present embodiment)

As described above, in the pump device 1 of the present embodiment, since the resin seal member 60 covering the stator 3 is provided with the first opening 636 reaching the stator core 31 from the bottom wall portion 63, the stator 3 can be positioned in the mold by directly contacting the positioning member with the stator core 31 at the position corresponding to the first opening 636 when the resin seal member 60 is molded. Therefore, as 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 positioning member is brought into direct contact with 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, thereby supporting the stator 3 in the radial direction and the direction of the rotation center axis L and positioning the same in the radial direction and 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.

Further, since the 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 is provided in the resin seal member 60, the positioning member is directly brought into contact with the end surface 311b of the annular portion 311 of the stator core 31 at a position corresponding to the second opening 637, thereby supporting and positioning the stator 3 in the direction of the rotation center axis L. Therefore, the position of the stator 3 is not easily displaced by the pressure when the resin is filled from the one 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 a 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 direction of the rotational center axis L of the annular portion 311 from the bottom wall portion 63, but the first opening 636 may reach a 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 direction of the rotational center axis L of the annular portion 311. The first opening 636 may reach the end surface 311b of the other side L2 in the direction of the rotation center axis L of the annular portion 311 from the bottom wall 63 and may not reach a part of the outer peripheral surface 311a of the annular portion 311 of the stator core 31.

Claims (11)

1. A pump device, characterized in that,

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

the motor includes: a cylindrical stator; a rotor having the impeller connected to an end portion on one side of the rotation central axis, the end portion being opposed to the stator on a radially inner side; and a resin sealing member covering the stator from both sides in a radial direction and both sides in the direction of the rotation central axis,

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

the resin sealing member has a first opening portion that reaches 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 from a bottom wall portion that covers the stator from the other side of the rotation center axis.

2. Pump apparatus according to claim 1,

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. Pump apparatus according to claim 2,

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. Pump arrangement according to claim 2 or 3,

the resin sealing member includes a protrusion protruding radially outward from a region where the protrusion overlaps a part of the outer peripheral surface of the annular portion that reaches the first opening portion from the radial direction and from the outside.

5. Pump device according to any one of claims 1 to 4,

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

6. Pump device according to any one of claims 1 to 5,

the resin sealing member has a second opening portion that reaches a part of the end surface from the bottom wall portion not to the outer peripheral surface of the annular portion.

7. The pump arrangement according to claim 6,

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

a recess portion recessed inward in the radial direction is provided on the outer peripheral surface of the flange portion,

the first opening and the second opening are provided at positions overlapping the concave portion, respectively.

8. Pump arrangement according to claim 6 or 7,

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

9. Pump device according to any one of claims 1 to 8,

the stator core is provided with a welded portion that connects portions extending in the circumferential direction to each other,

the resin sealing member covers the welding portion.

10. Pump device according to any one of claims 1 to 9,

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

11. The pump arrangement according to claim 10,

a partition wall portion of the resin seal member that forms a bottom portion of a pump chamber in which the impeller is disposed includes a conical surface that is inclined such that a radially outer portion is located closer to the pump chamber than a radially inner portion,

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

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