CN113958510A

CN113958510A - Pump device

Info

Publication number: CN113958510A
Application number: CN202110811275.3A
Authority: CN
Inventors: 山本岳; 矢沢岳彦
Original assignee: Nidec Sankyo Corp
Current assignee: Nidec Sankyo Corp
Priority date: 2020-07-20
Filing date: 2021-07-19
Publication date: 2022-01-21
Anticipated expiration: 2041-07-19
Also published as: CN113958510B; JP2022020100A

Abstract

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

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 partition member made of resin, and a rotor is rotatably supported by a support shaft supported by the partition member. In the case of a structure in which the support shaft is supported by the partition member, when the partition member is formed by insert molding so as to cover the stator, the support shaft is also insert molded together (see patent document 1).

Documents of the prior art

Patent document

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

Disclosure of Invention

Technical problem to be solved by the invention

It is necessary to provide a first partition wall portion that covers the stator from the pump chamber side and a second partition wall portion that is interposed between the stator and the rotor in 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, which causes a problem of complicated structure of the mold.

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

Technical scheme for solving technical problem

In order to solve the above-described problems, a pump device according to the present invention includes: a housing provided with 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 between the housing and the stator; and a support shaft that rotatably supports the rotor, wherein a shaft hole into which a first end portion of the support shaft on the opposite side of the pump chamber is fitted is formed in the partition member, and a receiving portion that faces a second end portion of the support shaft on the pump chamber side and that restricts a movable range of the support shaft to the pump chamber side is formed in the housing, the shaft hole including: 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 the side opposite to the pump chamber and engages with the first end portion to prevent rotation of the support shaft, wherein a gap between the second end portion and the receiving portion is smaller than a dimension of the first end portion located inside the second hole portion in the direction of the rotation center axis.

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 using insert molding that requires a mold having a complicated structure. Further, since the rotation of the support shaft is prevented by the second hole portion of the shaft hole, the support shaft can be held by the partition member in a stable state. In addition, since the clearance between the second end portion and the receiving portion is narrower than the dimension of the first end portion located inside the second hole portion in the rotational center axis direction, even when the fixing of the support shaft at the first hole portion is loosened by a rise in temperature or the like and the support shaft moves to the receiving portion side, the first end portion does not come out of the second hole portion. Therefore, the support 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 member, the first hole includes an inner portion of a first tube portion protruding from the bottom plate portion toward the pump chamber, the second hole is provided in an inner portion of a second tube portion having a bottom, the second tube portion protruding from the bottom plate portion toward a side opposite to the pump chamber. According to this aspect, an appropriate dimension can be secured in the rotation center axis direction in each of the first hole and the second hole.

In the present invention, the following manner may be adopted: the bottom plate portion is provided with a plurality of ribs connected to the 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 tubular portion can receive the load.

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

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

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 member is a resin seal member that covers the stator from both sides in the radial direction and both sides in the rotational 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 member are fixed by vibration welding. In this case, the following manner may be adopted: the housing is formed with a cylindrical portion in which the support shaft is located inside, the receiving portion is formed by a bottom portion of the cylindrical portion on one side in the rotational 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 using insert molding that requires a mold having a complicated structure. In addition, since the rotation of the support shaft is prevented by the second hole portion of the shaft hole, the support shaft can be held by the partition member in a stable state. In addition, since the clearance between the second end portion and the receiving portion is narrower than the dimension of the first end portion located inside the second hole portion in the rotational center axis direction, even when the fixing of the support shaft in the first hole portion is loosened due to a temperature rise or the like and the support shaft moves to the receiving portion side, the first end portion does not come out of 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 direction of the rotation center axis.

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

Fig. 6 is an exploded perspective view of the motor shown in fig. 2 as viewed 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; 4 … rotor; 5 … a magnet; 6 … partition members; 7 … fulcrum; 10 … electric motor; 11 … radial bearing; 12 … thrust bearing; 20 … pump chamber; 21 … suction tube; 21a … suction inlet; 22 … discharge pipe; 22a … discharge port; 23 … wall surface; 24 … bottom wall; 25 … impeller; 26 … disks; 27 … a support portion; 28 … a barrel portion; 29 … side walls; 31 … stator core; a 32 … insulator; 33 … coil; a 40 … cylindrical portion; 44 … through holes; 45 … flange portion; 60 … resin sealing member; 61 … first partition wall part; 62 … a second partition wall portion; 63 … a bottom plate portion; 64 … a body portion; 65 … axle hole; 66 … conical surfaces; 67 … annular peripheral region; 71 … a first end; 72 … second end; 280, 280 … a receiving part; 321 … first eaves; 322 … second eave; 631 … a first tubular portion; 632 … a second tubular portion; 635 … ribs; 651 … a first aperture portion; 652 … second hole part

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.

(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. 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 casing 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 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. Although detailed description is omitted, the stator core 31 includes a ring portion extending in an annular shape and a plurality of salient poles protruding radially inward from the ring portion. The coil 33 is wound between a first flange 321 radially inside and a second flange 322 radially outside 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. In this embodiment, the inner diameter Φ a of the suction port 21a communicating with the pump chamber 20 is larger than the inner diameter Φ b 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 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.

Here, the annular portion 51 of the magnet 5 is formed with recesses 53 (see fig. 5) at a plurality of locations in the circumferential direction, and the annular portion 41 of the rotor 4 is formed with protrusions 43 (see fig. 6) that fit into the recesses 53. Therefore, the convex portion 43 prevents the magnet 5 from rotating with respect to the rotor 4 by fitting into the concave portion 53. In the present embodiment, the convex portion 43 has a trapezoidal cross section in which the end portions located on both sides in the circumferential direction are inclined surfaces, and the concave portion 53 has a trapezoidal cross section or a rectangular cross section in which the wall portions located on both sides in the circumferential direction are inclined surfaces. In addition, when the convex portion 43 is fitted into the concave portion 53, the convex portion 43 abuts against a wall portion of the concave portion 53. Therefore, even if there is a variation in the height dimension of the convex portion 43 and the depth dimension of the concave portion 53, the magnet 5 can be appropriately positioned in the direction of the rotation central axis L, and the magnet 5 can be prevented from rattling with respect to the rotor 4.

In this embodiment, the magnet 5 is a neodymium magnet. In this magnet, the entire magnet is covered with a skin layer of resin. However, the portion 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 develop. In this embodiment, the gate is disposed at the bottom of the recess 52 or the bottom of the recess 53 in the end surface of one side L1 in the direction of the rotation center axis L of the magnet 5 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, the portion where the gate is located can be inhibited from rusting. As shown in fig. 5 and 6, 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.

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 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 disc 26, and a plurality of blade portions 261 are formed at equal angular intervals on the surface of the disc 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 is fitted, and a hole 452 into which the projection 262 is fitted is formed in the bottom of the groove 451. Therefore, when the disc 26 is overlappingly 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 disc 26. In this embodiment, the disc 26 is inclined so that the radially outer side is positioned closer to the flange 45 side than the radially inner side. Therefore, the distance between the disc 26 and the flange 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 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 by Bulk Molding Compound (BMC) or the like. In this embodiment, the resin sealing member 60 is made of polyphenylene Sulfide (PPS).

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

The bottom wall 24 includes an annular outer peripheral region 67 that is 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 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 directly overlaps the pump chamber 20 without facing the impeller 25.

In this way, in the pump device 1 of this embodiment, the through hole 44 is provided in the cylindrical portion 40 of the rotor 4 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 into the pump chamber 20 again 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 such that the radially outward side is located closer to the pump chamber 20 side than the radially inward side. 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 if foreign matter is mixed in the fluid, the foreign matter easily flows into the pump chamber 20. Therefore, foreign matter can be prevented 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.

The angle formed by the conical surface 66 and the rotation center axis L is 45 degrees or more. For example, the angle formed by the conical surface 66 and the rotation center axis L is 45 degrees or more and 65 degrees or less. Therefore, the pressure of the fluid flowing 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 that is orthogonal to the rotation center axis L on the outer peripheral side of the conical surface 66, the fluid can smoothly flow to the pump chamber 20 on the outer peripheral side of the bottom wall 24 through the outer peripheral side of the impeller 25.

Further, an imaginary line P that linearly connects the end portion on the pump chamber 20 side of the first eaves 321 on the radially inner side of the insulator 32 and the end portion on the pump chamber 20 side of the second eaves 322 on the radially outer side of the insulator 32 is inclined along the conical surface 66 with respect to the rotation center axis L, and the structure of the insulator 32 corresponds to the shape of the bottom wall 24. Therefore, the thickness of the first partition wall 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 Φ a larger than the inner diameter Φ b 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, the foreign matter remains 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, foreign matter is less likely to move from the cylindrical portion 40 through the through hole 44 to between the magnet 5 and the second partition wall portion 62.

(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 this embodiment, second hole 652 has 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, and thereby rotation of support shaft 7 is prevented. 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 the rotation of the support shaft 7.

In this embodiment, the shaft hole 65 is formed in the bottom plate portion 63 of the partition member 6. The first hole 651 includes an inner portion of a first tube 631 projecting from the bottom plate 63 toward the pump chamber 20, and the second hole 652 is provided in an inner portion of a second tube 632 having a bottom and projecting from the bottom plate 63 toward the side opposite to 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 cylinder 632.

Here, the opening edge of the axial hole 65 on the pump chamber 20 side is an inclined surface. The first tube 631 has a smaller thickness than the second tube 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 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, and the receiving portion 280 faces the end surface of the support shaft 7 on the second end portion 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 rotational 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 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 in the direction of the rotation center axis L of the first end portion 71 located inside the second hole portion 652, 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 in 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 a first tube 631 projecting from the bottom plate 63 toward the pump chamber 20, and the second hole 652 is provided in an inner portion of a second tube 632 with a bottom, which projects from the bottom plate 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. Further, since the bottom plate 63 is provided with the plurality of ribs 635 connected to the outer peripheral surface of the second cylindrical portion 632, the second cylindrical portion 632 can receive a large load even when the load is applied to the support shaft 7.

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 body 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 body portion 64, and the convex portion 290 is vibration-welded in the concave portion 640.

[ other embodiments ]

In the above embodiment, the partition member 6 is the resin seal member 60 covering the stator 3 from both sides in the radial direction and both sides in the direction of the rotational center axis L, but the present invention can also be applied to a case where the partition member 6 covers the stator 3 only from the inner side in the radial direction and one side L1 in the direction of the rotational center axis L.

Claims

1. A pump device is characterized by comprising:

a housing provided with a suction port and a discharge port; and

an electric motor including a stator and a rotor,

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

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

a receiving portion that limits a movable range of the support shaft toward the pump chamber side by facing a second end portion of the support shaft on the pump chamber side is formed in the housing,

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

a clearance 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 the rotational center axis direction.

2. Pump apparatus according to claim 1,

the shaft hole is formed in the bottom plate portion of the partition 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 tubular portion having a bottom, and the second tubular portion protrudes from the bottom plate portion toward a side opposite to the pump chamber.

3. Pump apparatus according to claim 2,

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

4. Pump arrangement according to claim 2 or 3,

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

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

in the second hole, a flat portion formed on an inner peripheral surface of the second hole and a flat portion formed on an outer peripheral surface of the support shaft overlap each other, thereby preventing rotation of the support shaft.

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

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

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

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

8. Pump device according to any one of claims 1 to 7,

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

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

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

10. The pump arrangement according to claim 9,

the housing is formed with a cylindrical portion, the support shaft is located inside the cylindrical portion,

the receiving portion is formed by a bottom portion of the cylinder portion on one side in the direction of the rotational center axis,

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