CN113958510B

CN113958510B - Pump device

Info

Publication number: CN113958510B
Application number: CN202110811275.3A
Authority: CN
Inventors: 山本岳; 矢沢岳彦
Original assignee: Nidec Sankyo Corp
Current assignee: Nidec Instruments Corp
Priority date: 2020-07-20
Filing date: 2021-07-19
Publication date: 2023-11-17
Anticipated expiration: 2041-07-19
Also published as: CN113958510A; JP7493403B2; JP2022020100A

Abstract

A pump device is provided which can hold a support shaft for rotatably supporting a rotor on a resin partition wall member without using insert molding. In the pump device, a first end (71) of a support shaft (7) is fixed to a first hole (651) of a shaft hole (65) of a resin partition wall member (6), and rotation is prevented by a second hole (652) of the shaft hole. Since the gap (G2) between the end face of the second end portion (72) and the receiving portion (280) is narrower than the dimension (G1) of the first end portion located inside the second hole portion in the rotation center axis (L) direction, the first end portion does not come out from the second hole portion even when the fixation of the fulcrum shaft in the first hole portion loosens due to a temperature rise and the fulcrum shaft moves to the receiving portion side. The first hole part includes an inner part of a first tube part protruding from the bottom plate part (63) to the pump chamber side, and the second hole part is provided in an inner part of a second tube part with a bottom protruding from the bottom plate part to the opposite side of the pump chamber.

Description

Pump device

Technical Field

The present invention relates to a pump device in which an impeller is rotated by a motor.

Background

In the pump device, an impeller disposed in a pump chamber is rotated by a pump. In the pump, a stator is covered with a resin partition member, and a rotor is rotatably supported by a support shaft supported by the partition member. When the support shaft is supported by the partition wall member, the support shaft is also insert molded together when the partition wall member is insert molded so as to cover the stator (see patent document 1).

Prior art literature

Patent literature

Patent document 1: japanese patent application laid-open No. 2019-2368

Disclosure of Invention

Technical problem to be solved by the invention

A first partition wall portion that covers the stator from the pump chamber side and a second partition wall portion interposed between the stator and the rotor need to be provided on a partition wall member used in the pump device. Therefore, the support shaft is disposed at the bottom of the recess surrounded by the second partition wall. Therefore, in the case of the insert molding support shaft, the second partition wall portion is molded around the mold for holding the support shaft, and thus there is a problem that the structure of the mold is complicated, and the like.

In view of the above, an object of the present invention is to provide a pump device capable of holding a support shaft for rotatably supporting a rotor in a resin partition member without using insert molding.

Technical proposal adopted for solving the technical problems

In order to solve the above-described problems, a pump device according to the present invention includes: a housing having a suction port and a discharge port; and a motor including a stator and a rotor, the motor including: a resin partition member that covers the stator and partitions a pump chamber in which an impeller is disposed with the housing; and a support shaft rotatably supporting the rotor, wherein a shaft hole into which a first end portion of the support shaft opposite to the pump chamber is fitted is formed in the partition member, a receiving portion is formed in the housing, the receiving portion being opposed to a second end portion of the support shaft on the pump chamber side, the movable range of the support shaft toward the pump chamber side is restricted, and the shaft hole includes: a first hole portion in which the first end portion is fixed; and a second hole portion that communicates with the first hole portion on an opposite side to the pump chamber and engages with the first end portion to prevent rotation of the support shaft, a gap between the second end portion and the receiving portion being narrower than a dimension in a rotation center axis direction of the first end portion located inside the second hole portion.

In the present invention, since the first end portion of the support shaft is fixed to the first hole portion of the shaft hole, the support shaft can be held by the partition member without insert molding using a mold having a complicated structure. Further, the pivot shaft is prevented from rotating by the second hole portion of the shaft hole, so that the pivot shaft can be held by the partition member in a stable state. In addition, since the gap between the second end portion and the receiving portion is narrower than the first end portion located inside the second hole portion in the rotation center axis direction, the first end portion does not come out from the second hole portion even when the fixation of the fulcrum shaft at the first hole portion is loosened due to a temperature rise or the like and the fulcrum shaft moves to the receiving portion side. Therefore, the fulcrum shaft can be prevented from rotating.

In the present invention, the following manner may be adopted: the shaft hole is formed in a bottom plate portion of the partition wall member, the first hole portion includes an inner portion of a first tube portion protruding from the bottom plate portion toward the pump chamber side, the second hole portion is provided in an inner portion of a second tube portion having a bottom protruding toward an opposite side of the pump chamber at the bottom plate portion. According to this aspect, an appropriate dimension can be ensured in the rotation center axis direction in each of the first hole portion and the second hole portion.

In the present invention, the following manner may be adopted: the bottom plate portion is provided with a plurality of ribs connected to an outer peripheral surface of the second tube portion. According to this aspect, even when a large load is applied to the support shaft, the second cylindrical portion can receive the load.

In the present invention, the following manner may be adopted: the wall thickness of the first barrel portion is thinner than the wall thickness of the second barrel portion.

In the present invention, the following manner may be adopted: in the second hole portion, a flat portion formed on an inner peripheral surface of the second hole portion and a flat portion formed on an outer peripheral surface of the support shaft overlap, whereby rotation of the support shaft is prevented.

In the present invention, the following manner may be adopted: the opening edge of the shaft hole on the pump chamber side is an inclined surface. According to this aspect, the support shaft can be easily fitted into the shaft hole.

In the present invention, the following manner may be adopted: the partition wall member is a resin sealing member that covers the stator from both sides in the radial direction and both sides in the rotation center axis direction.

In the present invention, the following manner may be adopted: the support shaft is fixed to the partition member by being press-fitted into the first hole.

In the present invention, the following manner may be adopted: the housing and the partition wall member are fixed by vibration welding. In this case, the following manner may be adopted: the housing is provided with a cylindrical portion in which the support shaft is positioned, the receiving portion is formed by a bottom portion of the cylindrical portion on one side in the rotation center axis direction, and a gap is provided between an outer peripheral surface of the support shaft and an inner peripheral surface of the cylindrical portion.

Effects of the invention

In the present invention, since the first end portion of the support shaft is fixed to the first hole portion of the shaft hole, the support shaft can be held by the partition member without insert molding using a mold having a complicated structure. Further, the rotation of the support shaft is prevented by the second hole portion of the shaft hole, so that the support shaft can be held by the partition member in a stable state. In addition, since the gap between the second end portion and the receiving portion is narrower than the first end portion located inside the second hole portion in the rotation center axis direction, even when the fixation of the fulcrum shaft in the first hole portion is loosened due to a temperature rise or the like and the fulcrum shaft moves to the receiving portion side, the first end portion does not come out from the second hole portion. Therefore, the rotation of the support shaft can be prevented.

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 a perspective view of the housing and the like shown in fig. 3, as viewed from the other side in the rotation center axis direction.

Fig. 5 is an exploded perspective view of the motor shown in fig. 2, as seen from one side in the direction of the rotation central axis.

Fig. 6 is an exploded perspective view of the motor shown in fig. 2, as seen from the other side in the direction of the rotation center axis L.

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; 11 … radial bearings; 12 … thrust bearing; 20 … pump chambers; 21 … suction pipe; 21a … suction inlet; 22 … discharge tube; 22a … outlet; 23 … wall surfaces; 24 … bottom wall; 25 … impeller; 26 … disks; 27 … support; 28 … barrel portion; 29 … side walls; 31 … stator core; 32 … insulator; 33 … coil; 40 … cylinder part; 44 … through holes; 45 … flange portions; 60 … resin sealing member; 61 … first partition wall portions; 62 … second partition wall portions; 63 … floor portions; 64 … body portion; 65 … shaft holes; 66 … conical surface; 67 … annular peripheral region; 71 … first end; 72 … second end; 280 … receiver; 321 … first eaves; 322 … second eaves; 631 … a first barrel portion; 632 … second barrel portion; 635 … ribs; 651 … first aperture portion; 652 and … second hole portion

Detailed Description

Next, an example in which the motor device of the present invention is configured as a pump device will be described as an embodiment of the present invention.

(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. Fig. 4 is a perspective view of the housing 2 and the like shown in fig. 3, as viewed from the other side L2 in the direction of the rotation center axis L. Fig. 5 is an exploded perspective view of the motor 10 shown in fig. 2, as viewed from one side L1 in the direction of the rotation center axis L. Fig. 6 is an exploded perspective view of the motor 10 shown in fig. 2, as viewed from the other side L2 in the direction of the rotation center axis L.

In fig. 1, 2 and 3, the pump device 1 includes: a housing 2 having a suction port 21a and a discharge port 22a; a motor 10 including a stator 3 and a rotor 4; and an impeller 25 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. Although a detailed description is omitted, 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. The coil 33 is wound between a first eave 321 on the radial inner side and a second eave 322 on the radial 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. In the present embodiment, the inner diameter Φa of the suction port 21a communicating with the pump chamber 20 is larger than the inner diameter Φb of the cylindrical portion 40 of the rotor 4.

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.

Here, recesses 53 are formed in a plurality of portions in the circumferential direction in the annular portion 51 of the magnet 5 (see fig. 5), and projections 43 fitted into the recesses 53 are formed in the annular portion 41 of the rotor 4 (see fig. 6). Therefore, the protruding portion 43 prevents the magnet 5 from rotating relative to the rotor 4 by being fitted into the recessed portion 53. In the present embodiment, the convex portion 43 has a cross-sectional trapezoidal shape in which end portions located on both sides in the circumferential direction are inclined surfaces, and the concave portion 53 has a cross-sectional trapezoidal shape or a cross-sectional rectangular shape in which wall portions located on both sides in the circumferential direction are inclined surfaces. When the convex portion 43 is fitted into the concave portion 53, the convex portion 43 abuts against the wall portion of the concave portion 53. Therefore, even if there is a deviation in the height dimension of the protruding portion 43 and the depth dimension of the recessed portion 53, the magnet 5 can be properly positioned in the rotation center axis L direction, and the magnet 5 can be prevented from shaking with respect to the rotor 4.

In this embodiment, the magnet 5 is a neodymium magnet. In this magnet, the whole is covered with a skin layer of resin. However, the part where the gate is located when the magnet 5 is molded is not covered with the skin layer, and the metal is exposed, so that rust is likely to occur. In this embodiment, the gate is arranged at the bottom of the recess 52 or the bottom of the recess 53 on the end face of the magnet 5 on the side L1 in the direction of the rotation center axis L to mold the magnet 5. Therefore, when the magnet 5 is molded, the portion where the gate is located is covered with the adhesive after the magnet 5 and the rotor 4 are bonded. Therefore, rust at the portion where the gate is located can be suppressed. As shown in fig. 5 and 6, a ring 15 for preventing cracks or the like of the magnet 5 is attached to the surface of the magnet 5 opposite to the pump chamber 20.

As shown in fig. 2, 3 and 4, in the rotor 4 of the present embodiment, 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 cylindrical portion in the direction 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 an end portion of the blade 261 on the flange portion 45 side is fitted is formed in the flange portion 45, and a hole 452 into which the projection 262 is fitted is formed in a bottom portion 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 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 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.

As shown in fig. 2, 5 and 6, 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 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 at the time of insert molding the stator 3 by BMC (Bulk Molding Compound: bulk molding compound) or the like. In this embodiment, the material of the resin sealing member 60 is polyphenylene sulfide (PPS: poly Phenylene Sulfide).

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, when the connector is connected to the connector housing 69 for power supply 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. In this embodiment, the through-hole 44 is provided in the cylindrical portion 40 at two positions offset from each other by 180 degrees in angular position.

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, and the conical surface 66 is inclined radially outward of the through hole 44 so that the radially outward is located closer to the pump chamber 20 than the radially inward. In accordance with this configuration, an imaginary line P that linearly connects the pump chamber 20 side end of the first flange 321 on the radial inner side of the insulator 32 and the pump chamber 20 side end of the second flange 322 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.

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 directly overlaps the pump chamber 20 without facing the impeller 25.

As described above, in the pump device 1 of the present embodiment, the through hole 44 is provided between the portion holding the magnet 5 and the impeller 25 in the cylindrical portion 40 of the rotor 4. 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 into the fluid returns to the pump chamber 20.

Here, the bottom wall 24 of the pump chamber 20 has a conical surface 66, and the conical surface 66 is inclined radially outward of the through hole 44 so that the radially outward is located closer to the pump chamber 20 than the radially inward. Therefore, since the pressure of the fluid flowing from the through-hole 44 toward the pump chamber 20 along the bottom wall 24 is high, even when foreign matter is mixed in the fluid, the foreign matter easily flows into the pump chamber 20. Therefore, foreign matter can be restrained from moving from the pump chamber 20 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.

The angle between the conical surface 66 and the rotation center axis L is 45 degrees or more. For example, the angle between the conical surface 66 and the rotation center axis L is 45 degrees or more and 65 degrees or less. Accordingly, the pressure of the fluid from the through-hole 44 toward the pump chamber 20 along the bottom wall 24 can be appropriately increased.

Further, since the bottom wall 24 includes the annular outer peripheral region 67 orthogonal to the rotation center axis L on the outer peripheral side of the conical surface 66, fluid can smoothly flow to the pump chamber 20 through the outer peripheral side of the impeller 25 on the outer peripheral side of the bottom wall 24.

Further, an imaginary line P connecting the end portion on the pump chamber 20 side of the first flange 321 on the radial inner side of the insulator 32 and the end portion on the pump chamber 20 side of the second flange 322 on the radial outer side of the insulator 32 in a straight line is inclined with respect to the rotation center axis L so as to follow the conical surface 66, and the structure of the insulator 32 corresponds to the shape of the bottom wall 24. Therefore, the thickness of the first partition wall portion 61 constituting the bottom wall 24 can be set to an appropriate thickness.

Further, since the suction port 21a communicating with the pump chamber 20 has an inner diameter Φa larger than the inner diameter Φb of the cylindrical portion 40 and is concentric with respect to the rotation center axis L, the velocity of the fluid at the side wall 29 of the pump chamber 20 can be reduced. Therefore, foreign matter stays in the region of the pump chamber 20 along the side wall 29, and is less likely to flow into the inside of the cylindrical portion 40. Therefore, the foreign matter is less likely to move from the cylindrical portion 40 to the space between the magnet 5 and the second partition wall portion 62 through the through hole 44.

(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 this embodiment, the second hole 652 is formed such that a flat surface portion formed on the inner peripheral surface of the second hole 652 overlaps a flat surface portion formed on the outer peripheral surface of the support shaft 7, thereby preventing the support shaft 7 from rotating. 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 pivot shaft 7 from rotating.

In this embodiment, the shaft hole 65 is formed in the bottom plate 63 of the partition member 6. The first hole 651 includes an inner portion of the first tube portion 631 protruding from the bottom plate 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 protruding from the bottom plate 63 toward the opposite side of the pump chamber 20. In this embodiment, the bottom plate 63 is provided with a plurality of triangular ribs 635 connected to the outer peripheral surface of the second tube 632.

Here, the opening edge of the shaft hole 65 on the pump chamber 20 side is an inclined surface. The wall thickness of the first tube portion 631 is thinner than the wall thickness of the second tube portion 632.

In this embodiment, 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 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 tube 28, and the receiving portion 280 faces the end surface of the support shaft 7 on the second end 72 side via the gap G2. 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 direction of the rotation center axis L 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 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 in the direction of the rotation central axis L of the first end portion 71 located inside the second hole portion 652, even when the fixation of the support shaft 7 in the first hole portion 651 is loosened due to a temperature rise, the first end portion 71 does not come out from the second hole portion 652 when the support shaft 7 moves to the receiving portion 280 side. Therefore, the rotation of the support shaft 7 can be prevented. Further, even when the fixation of the fulcrum shaft 7 in the first hole portion 651 is loosened due to the temperature rise, if the temperature decreases, the fixation of the fulcrum 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 plate 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 bottom plate 63 toward the opposite side from the pump chamber 20. 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 plate 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 in 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 main body 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 one side L1 of the main body 64 in the rotation center axis L direction, and vibration welding is performed on the convex portion 290 in the concave portion 640.

Other embodiments

In the above embodiment, the partition wall member 6 is the 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, but the present invention can be applied to a case where the partition wall member 6 covers the stator 3 from only the inside in the radial direction and one side L1 in the direction of the rotation center axis L.

Claims

1. A pump device, comprising:

a housing having a suction port and a discharge port; and

an electric motor having a stator and a rotor,

the motor is provided with: a resin partition member that covers the stator and that partitions a pump chamber in which an impeller is disposed with the casing; and a support shaft rotatably supporting the rotor,

the partition member is formed with a shaft hole into which a first end portion of the support shaft on the opposite side of the pump chamber is fitted,

a receiving portion is formed in the housing, the receiving portion being opposed to the second end portion of the support shaft on the pump chamber side to limit a movable range of the support shaft toward the pump chamber side,

the shaft hole is provided with: a first hole portion to which the first end portion is fixed; and a second hole portion which communicates with the first hole portion on a side opposite to the pump chamber and engages with the first end portion to prevent rotation of the support shaft,

a gap between the second end portion and the receiving portion is narrower than a dimension of the first end portion located inside the second hole portion in a rotation center axis direction.

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

the shaft hole is formed in a bottom plate portion of the partition member,

the first hole portion includes an inner side portion of a first tube portion protruding from the bottom plate portion toward the pump chamber side,

the second hole portion is provided in an inner portion of a bottomed second tube portion protruding toward an opposite side of the pump chamber at the bottom plate portion.

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

the bottom plate portion is provided with a plurality of ribs connected to an outer peripheral surface of the second tube portion.

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

the wall thickness of the first barrel portion is thinner than the wall thickness of the second barrel portion.

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

in the second hole portion, a flat portion formed on an inner peripheral surface of the second hole portion and a flat portion formed on an outer peripheral surface of the support shaft overlap, whereby rotation of the support shaft is prevented.

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

the opening edge of the shaft hole on the pump chamber side is an inclined surface.

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

the partition wall member is a resin sealing member that covers the stator from both sides in a radial direction and both sides in a rotation center axis direction.

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

the support shaft is fixed to the partition member by being press-fitted into the first hole.

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

the case is fixed to the partition member by vibration welding.

10. The pump apparatus of claim 9, wherein the pump apparatus comprises a pump assembly,

the housing is formed with a cylindrical portion, the fulcrum is located inside the cylindrical portion,

the receiving portion is constituted by a bottom portion of one side of the cylindrical portion in the rotation center axis direction,

a gap is provided between an outer peripheral surface of the support shaft and an inner peripheral surface of the cylindrical portion.