JP7488143B2 - Pumping equipment - Google Patents

Description

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

In the pump device, the impeller disposed in the pump chamber is rotated by the pump. In the pump, the stator has an annular portion and a plurality of salient pole portions protruding radially inward from the annular portion, and a coil is wound around the salient pole portions via an insulator. The stator has a resin sealing member formed by insert molding to cover the coil and the like. The resin sealing member has a first partition portion constituting a bottom wall located on the motor side with respect to the impeller in the pump chamber, and a second partition portion in which the rotor is disposed radially inside the stator, and the first partition portion is perpendicular to the central axis of rotation of the rotor. The rotor has a cylindrical portion that holds a magnet so as to face the stator radially inside via the second partition portion, and the tip of the cylindrical portion has a flange portion that constitutes the lower half of the impeller in the pump chamber. A through hole for venting air is formed in the cylindrical portion between the portion that holds the magnet and the flange portion.

JP 2009-296687 A

In the pump device described in Patent Document 1, when the impeller rotates, part of the fluid flows from the pump chamber into the cylindrical part of the rotor, and then flows through the through hole in the cylindrical part along the bottom wall back into the pump chamber. As a result, air mixed in the fluid is returned to the pump chamber and discharged from the pump chamber. Here, since the first partition part is perpendicular to the central axis of rotation of the rotor, the pressure of the fluid moving from the through hole along the bottom wall to the pump chamber is low. Therefore, if foreign matter is mixed in the fluid, the foreign matter may not flow out to the pump chamber and may get between the magnet held by the rotor and the second partition part. If such a situation occurs, the foreign matter may be caught between the magnet and the second partition part and hinder the rotation of the rotor, which is undesirable.

In view of the above problems, the objective of the present invention is to provide a pump device that can prevent foreign matter from entering between the magnet held by the rotor and the partition member.

In order to achieve the above object, a pump device according to the present invention includes a motor, and an impeller arranged in a pump chamber provided on one side of a rotational center axis of the motor, the motor includes a cylindrical stator having a stator core around which a coil is wound, and a case arranged on the one side of the stator to define the pump chamber and to house the impeller.
a rotor including a cylindrical portion extending from a position facing the stator on the radial inside toward the pump chamber along the central axis of rotation, the impeller being connected to the cylindrical portion; a magnet held in the cylindrical portion so as to face the stator on the radial inside; and a resin partition member covering the stator, the partition member having a first partition portion constituting a bottom wall of the pump chamber and a second partition portion interposed between the stator and the magnet, the case having a wall surface facing the first partition portion and a partition wall of the impeller. and a side wall extending circumferentially at a radially outer position, the cylindrical portion having a through hole between the portion that holds the magnet and the impeller, the bottom wall having a conical surface that is inclined radially outward of the through hole so that the radially outward is located closer to the pump chamber than the radially inner side, the through hole being provided in a range that overlaps with the conical surface when viewed from a direction perpendicular to the central axis of rotation, and as the impeller rotates, fluid in the pump chamber is discharged from a discharge pipe connected to the side wall .

In the pump device according to the present invention, the cylindrical part of the rotor has a through hole between the part that holds the magnet and the impeller. When the impeller rotates, a part of the fluid flows from the pump chamber into the cylindrical part of the rotor, and then flows through the through hole of the cylindrical part along the bottom wall back into the pump chamber. Therefore, even if air bubbles are mixed into the fluid, the air bubbles can be returned to the pump chamber. In addition, the bottom wall of the pump chamber has a conical surface that is inclined so that the radially outer side is located closer to the pump chamber than the radially inner side on the radially outer side of the through hole, so that the pressure of the fluid moving toward the pump chamber along the bottom wall is high. Therefore, even if a foreign object is mixed into the fluid, the foreign object flows into the pump chamber, and is therefore unlikely to get between the magnet held by the rotor and the second partition. Therefore, it is unlikely that a situation will occur in which a foreign object is caught between the magnet and the second partition and the rotation of the rotor is hindered.

In the present invention, the bottom wall may have an annular outer peripheral area on the outer periphery of the conical surface that is perpendicular to the central axis of rotation. According to this embodiment, the fluid can be smoothly discharged from the outer periphery of the bottom wall through the outer periphery of the impeller into the pump chamber.

In the present invention, the partition member may be a resin sealing member that covers the stator from both radial sides and both sides in the direction of the central axis of rotation.

In the present invention, the stator may have the coil wound around the stator core via an insulator that covers the stator core, and an imaginary line that linearly connects the pump chamber side end of the first flange portion on the radial inside of the insulator and the pump chamber side end of the second flange portion on the radial outside of the insulator may be inclined to follow the conical surface with respect to the rotation center axis. According to this aspect, the structure of the insulator corresponds to the shape of the bottom wall, so that the thickness of the first partition portion that constitutes the bottom wall can be made appropriate.

In the present invention, the suction port communicating with the pump chamber can be provided concentrically with the rotational center axis with an inner diameter larger than the inner diameter of the cylindrical portion. According to this aspect, the speed of the fluid on the side wall of the pump chamber can be reduced, so that foreign matter is less likely to enter the inside of the cylindrical portion of the rotor. Therefore, since foreign matter is likely to remain in the pump chamber, it is possible to prevent the foreign matter from moving from the pump chamber to between the magnet held by the rotor and the second partition portion.

In the present invention, an embodiment can be adopted in which the angle between the conical surface and the central axis of rotation is 45 degrees or more. For example, an embodiment can be adopted in which the angle between the conical surface and the central axis of rotation is 45 degrees or more and 60 degrees or less. According to this embodiment, it is possible to appropriately increase the pressure of the fluid flowing from the through hole along the bottom wall toward the pump chamber.

In the pump device according to the present invention, the cylindrical part of the rotor has a through hole between the part that holds the magnet and the impeller. When the impeller rotates, a part of the fluid flows from the pump chamber into the cylindrical part of the rotor, and then flows through the through hole in the cylindrical part along the bottom wall back into the pump chamber. Therefore, even if air bubbles are mixed in the fluid, the air bubbles can be returned to the pump chamber. In addition, the bottom wall of the pump chamber has a conical surface that is inclined so that the radially outer side is located closer to the pump chamber than the radially inner side on the radially outer side of the through hole, so that the pressure of the fluid moving toward the pump chamber along the bottom wall is high. Therefore, even if a foreign object is mixed in the fluid, the foreign object flows into the pump chamber and is unlikely to get between the magnet held by the rotor and the second partition. Therefore, it is unlikely that a situation will occur in which a foreign object is caught between the magnet and the second partition and the rotation of the rotor is hindered.

1 is a perspective view showing an embodiment of a pump device to which the present invention is applied; FIG. 2 is a vertical cross-sectional view of the pump device shown in FIG. 1 . FIG. 2 is an exploded perspective view of the pump device shown in FIG. 1 . 4 is a perspective view of the case and the like shown in FIG. 3 as viewed from the other side in the direction of the central axis of rotation. 3 is an exploded perspective view of the motor shown in FIG. 2 as viewed from one side in the direction of the central axis of rotation. 3 is an exploded perspective view of the motor shown in FIG. 2 as viewed from the other side in the direction of the central axis L of rotation.

Below, we will explain an example of an embodiment of the present invention in which the motor device according to the present invention is configured as a pump device.

(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 vertical cross-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 case 2 and the like shown in Fig. 3, as viewed from the other side L2 in the direction of the central axis L of rotation. 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 central axis L of rotation. 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 central axis L of rotation.

In Figures 1, 2 and 3, the pump device 1 includes a case 2 with an intake port 21a and an exhaust port 22a, a motor 10 with a stator 3 and a rotor 4, and an impeller 25 arranged in a pump chamber 20 provided on one side L1 of the motor 10 in the direction of the central axis L of rotation. The stator 3 is cylindrical. The motor 10 includes a resin partition member 6 that covers the stator 3, and a round bar-shaped support shaft 7 that rotatably supports the rotor 4. The support shaft 7 is made of metal or ceramic. In this embodiment of the pump device 1, the fluid is liquid, and the pump device 1 is used under conditions where the environmental temperature and the fluid temperature are likely to change.

The case 2 constitutes a wall surface 23 on one side L1 of the pump chamber 20 in the direction of the central axis L of rotation, and a side wall 29 extending in the circumferential direction. The case 2 has an intake pipe 21 extending along the central axis L of rotation, and an exhaust pipe 22 extending in a direction perpendicular to the central axis L of rotation, and the intake pipe 21 and the exhaust pipe 22 each have an intake port 21a and an exhaust port 22a at their ends. The intake pipe 21 and the intake port 21a are arranged concentrically with the central axis L of rotation.

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 has an annular portion extending in an annular shape and a number of salient poles protruding radially inward from the annular portion. The coil 33 is wound between a first flange portion 321 on the radial inner side of the insulator 32 that covers the salient poles and a second flange portion 322 on the radial outer side. In this 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 has a cylindrical portion 40 that extends from a position facing the stator 3 on the radial inside toward the pump chamber 20 along the central axis of rotation 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 21a. In this embodiment, the inner diameter φa of the suction port 21a that communicates 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 circumferential 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 an annular portion 41 overlapping the magnet 5 from one side L1 in the direction of the rotation central axis L, and an annular protruding portion 42 protruding from the outer edge of the annular portion 41 to the other side L2 in the direction of the rotation central axis L, and the protruding portion 42 covers the end of the magnet 5 on the one side L1 in the direction of the rotation central axis L from the radially outer side. In response to this configuration, the end of the magnet 5 on the one side L1 in the direction of the rotation central axis L is formed with an annular portion 51 overlapping the annular portion 41 inside the protruding portion 42, and an annular recessed portion 52 recessed on the other side L2 in the direction of the rotation central axis L on the radially outer side of the annular portion 51, and the protruding portion 42 overlaps 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 has recesses 53 (see FIG. 5) formed at multiple locations in the circumferential direction, and the annular portion 41 of the rotor 4 has protrusions 43 (see FIG. 6) that fit into the recesses 53. Therefore, the protrusions 43 fit into the recesses 53 to prevent the magnet 5 from rotating relative to the rotor 4. In this embodiment, the protrusions 43 have a trapezoidal cross section with inclined ends on both sides in the circumferential direction, and the recesses 53 have a trapezoidal or rectangular cross section with inclined walls on both sides in the circumferential direction. In addition, when the protrusions 43 fit into the recesses 53, the protrusions 43 abut against the walls of the recesses 53. Therefore, even if the height dimension of the protrusions 43 and the depth dimension of the recesses 53 vary, the magnet 5 can be properly positioned in the direction of the central axis L of rotation, and the magnet 5 can be prevented from rattling relative to the rotor 4.

In this embodiment, the magnet 5 is a neodymium bonded magnet. In such a magnet, the entire magnet is covered with a resin skin layer. However, the area where the gate was located when the magnet 5 was molded is not covered with the skin layer and the metal is exposed, making it prone to rust. Therefore, in this embodiment, the gate is placed at the bottom of the recess 52 or the bottom of the recess 53 on the end face of one side L1 of the magnet 5 in the direction of the rotation center axis L, and the magnet 5 is molded. Therefore, the area where the gate was located when the magnet 5 was molded is covered with adhesive after the magnet 5 and the rotor 4 are bonded. Therefore, it is possible to suppress the occurrence of rust at the area where the gate was located. As shown in Figures 5 and 6, a ring 15 is attached to the surface of the magnet 5 opposite the pump chamber 20 to prevent the magnet 5 from cracking.

As shown in Figures 2, 3 and 4, in the rotor 4 of this embodiment, a disk-shaped flange portion 45 is formed at the end of one side L1 in the direction of the central axis L of the cylindrical portion 40, and a disk 26 is connected to the flange portion 45 from one side L1 in the direction of the central axis L of the rotation. 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, which extend radially outward while curving in an arc from the periphery of the central hole 260. Each of the plurality of blade portions 261 is formed with a protrusion 262 protruding toward the flange portion 45.

A groove 451 is formed in the flange portion 45 into which the flange portion 45 side end of the blade portion 261 fits, and a hole 452 is formed at the bottom of the groove 451 into which the protrusion 262 fits. Therefore, when the disk 26 is stacked and fixed on the flange portion 45 so that the protrusion 262 fits into the hole 452, the flange portion 45 and the disk 26 form an impeller 25 connected to the cylindrical portion 40 of the rotor 4. In this embodiment, the disk 26 is inclined so that the radial outer side is located closer to the flange portion 45 than the radial inner side. Therefore, the distance between the disk 26 and the flange portion 45 is narrower on the radial outer side than on the radial inner side.

As shown in Figures 2, 5, and 6, the rotor 4 has a cylindrical radial bearing 11 held by crimping or other methods on the radial inside of the cylindrical portion 40, and the rotor 4 is rotatably supported on the support shaft 7 via the radial bearing 11. The support shaft 7 is held by the bulkhead member 6, as described below.

The partition member 6 has a first partition portion 61 constituting the bottom wall 24 facing the wall surface 23 of the pump chamber 20, and a second partition portion 62 interposed between the stator 3 and the magnet 5. In this embodiment, the partition member 6 is a resin sealing member 60 that covers the stator 3 from both radial sides and both sides in the direction of the central axis L of rotation, and is a resin portion formed when the stator 3 is insert molded using BMC (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 central axis L of rotation, and a board 19 on which a circuit for controlling the power supply to the coil 33 is provided is disposed between the cover 18 and the resin sealing member 60. In addition, a connector housing 69 is formed in the partition member 6. Therefore, when a connector is connected to the connector housing 69 to supply power, the rotor 4 rotates around the central axis L of rotation. As a result, when the impeller 25 rotates in the pump chamber 20, the inside of the pump chamber 20 becomes negative pressure, so that the fluid is sucked into the pump chamber 20 from the suction pipe 21 and discharged from the discharge pipe 22.

(Detailed configuration of cylindrical portion 40 of rotor 4, etc.)
In the motor 10 of this embodiment, the cylindrical portion 40 of the rotor 4 is provided with through holes 44 between the portion that holds the magnets 5 and the impeller 25. In this embodiment, the through holes 44 are provided in two locations in the cylindrical portion 40 that are angularly shifted 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 that is inclined so that the radially outer side is located closer to the pump chamber 20 than the radially inner side on the radially outer side of the through hole 44. In accordance with this configuration, an imaginary line P that linearly connects the pump chamber 20 side end of the radially inner first flange portion 321 of the insulator 32 and the pump chamber 20 side end of the radially outer second flange portion 322 of the insulator 32 is inclined to follow 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 also has an annular outer peripheral region 67 on the outer periphery of the conical surface 66, which is perpendicular to the central axis of rotation L. In this embodiment, the conical surface 66 overlaps with the impeller 25 from a midpoint 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 does not face the impeller 25, but directly overlaps with the pump chamber 20.

In this manner, in the pump device 1 of this embodiment, the cylindrical portion 40 of the rotor 4 has a through hole 44 between the portion that holds the magnet 5 and the impeller 25. Therefore, when the impeller 25 rotates, a portion of the fluid flows from the pump chamber 20 into the cylindrical portion 40 of the rotor 4, and then flows through the through hole 44 of the cylindrical portion 40 along the bottom wall 24 back into the pump chamber 20. Therefore, air that has mixed in with the fluid is returned to the pump chamber 20.

Here, the bottom wall 24 of the pump chamber 20 has a conical surface 66 that is inclined so that the radially outer side is located closer to the pump chamber 20 than the radially inner side on the radially outer side of the through hole 44. Therefore, since the pressure of the fluid flowing from the through hole 44 along the bottom wall 24 to the pump chamber 20 is high, even if foreign matter is mixed into the fluid, the foreign matter is likely to flow into the pump chamber 20. Therefore, it is possible to prevent the foreign matter from moving from the pump chamber 20 to between the magnet 5 held by the rotor 4 and the second partition portion 62. Therefore, it is difficult for a foreign matter to get caught between the magnet 5 and the second partition portion 62, hindering the rotation of the rotor 4.

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

The bottom wall 24 also has an annular outer peripheral region 67 on the outer periphery of the conical surface 66 that is perpendicular to the central axis of rotation L, so that the fluid can flow smoothly from the outer periphery of the bottom wall 24 through the outer periphery of the impeller 25 into the pump chamber 20.

In addition, an imaginary line P that linearly connects the end of the first flange 321 on the radial inside of the insulator 32 on the pump chamber 20 side to the end of the second flange 322 on the radial outside of the insulator 32 on the pump chamber 20 side is inclined to follow 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 portion 61 that constitutes the bottom wall 24 can be made appropriate.

In addition, the suction port 21a communicating with the pump chamber 20 is provided concentrically with the central axis of rotation L with an inner diameter φa larger than the inner diameter φb of the cylindrical portion 40, so that the speed of the fluid on the side wall 29 of the pump chamber 20 can be reduced. Therefore, foreign matter is retained in the area along the side wall 29 of the pump chamber 20 and is unlikely to flow into the inside of the cylindrical portion 40. Therefore, it is unlikely that foreign matter will move from the cylindrical portion 40 through the through hole 44 to between the magnet 5 and the second partition portion 62.

(Fixing structure of support shaft 7)
2, the partition member 6 is formed with a shaft hole 65 into which a first end 71 of the spindle 7 is fitted on the side opposite to the pump chamber 20. On the other hand, the case 2 is formed with a receiving portion 280 that faces the second end 72 of the spindle 7 on the pump chamber 20 side on the pump chamber 20 side and limits the movable range of the spindle 7 towards the pump chamber 20 side.

The shaft hole 65 has a first hole portion 651 to which the first end portion 71 is fixed, and a second hole portion 652 that communicates with the first hole portion 651 on the side opposite the pump chamber 20, and the second hole portion 652 engages with the first end portion 71 to prevent the support shaft 7 from rotating. In this embodiment, the support shaft 7 is fixed to the partition member 6 by being pressed into the first hole portion 651.

In this embodiment, in the second hole 652, the rotation of the spindle 7 is prevented by the overlap of a flat surface formed on the inner circumferential surface of the second hole 652 and a flat surface formed on the outer circumferential surface of the spindle 7. For example, the first end 71 and the second hole 652 are both formed with a D-shaped cross section. Therefore, the flat surface 652a of the second hole 652 overlaps with the flat surface 71a of the first end 71, so the second hole 652 engages with the first end 71 to prevent the spindle 7 from rotating.

In this embodiment, the shaft hole 65 is formed in the bottom plate portion 63 of the partition member 6. The first hole portion 651 includes an inner portion of the first tubular portion 631 that protrudes from the bottom plate portion 63 toward the pump chamber 20, and the second hole portion 652 is provided in an inner portion of the bottomed second tubular portion 632 that protrudes from the bottom plate portion 63 toward the side opposite the pump chamber 20. In this embodiment, the bottom plate portion 63 is provided with a plurality of triangular ribs 635 that are connected to the outer circumferential surface of the second tubular portion 632.

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

In this embodiment, the case 2 has three support parts 27 extending from the inner peripheral surface of the suction pipe 21 toward the motor 10. A cylindrical part 28 is formed at the end of the support part 27, and the support shaft 7 is located inside the cylindrical part 28. The bottom of the cylindrical part 28 on one side L1 in the direction of the central axis L of rotation forms the receiving part 28.
0 is configured. A gap is provided between the outer circumferential surface of the support shaft 7 and the inner circumferential surface of the tube portion 28, and the receiving portion 280 faces the end face of the support shaft 7 on the side of the second end portion 72 via a gap G2. Here, the gap G2 between the end face 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.

The second end 72 of the support shaft 7 is fitted with an annular thrust bearing 12, which is disposed between the radial bearing 11 and the cylindrical portion 28. The second end 72 of the support shaft 7 and the hole 121 of the thrust bearing 12 are formed with a D-shaped cross section, preventing the thrust bearing 12 and the support shaft 7 from rotating.

In this manner, in the pump device 1 of this embodiment, the first end 71 of the shaft 7 is fixed to the first hole 651 of the shaft hole 65 of the partition member 6. Therefore, the shaft 7 can be held in the partition member 6 without using insert molding, which requires a mold with a complex configuration. In addition, the second hole 652 of the shaft hole 65 prevents the shaft 7 from rotating, so the shaft 7 can be held in a stable state in the partition member 6. In addition, the gap G2 between the end face of the second end 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 71 located inside the second hole 652, so that even when the temperature rises and the fixation of the shaft 7 in the first hole 651 loosens, and the shaft 7 moves toward the receiving portion 280, the first end 71 does not come out of the second hole 652. Therefore, the shaft 7 can be prevented from rotating. Furthermore, even if the temperature rises and the fixation of the support shaft 7 in the first hole portion 651 becomes loose, the fixation of the support shaft 7 in the first hole portion 651 will tighten if the temperature falls.

The first hole 651 includes an inner portion of the first tubular portion 631 that protrudes from the bottom plate portion 63 toward the pump chamber 20, and the second hole 652 is provided in an inner portion of the bottomed second tubular portion 632 that protrudes from the bottom plate portion 63 toward the side opposite the pump chamber 20. This ensures that the first hole 651 and the second hole 652 each have appropriate dimensions in the direction of the central axis L of rotation. The bottom plate portion 63 is provided with a plurality of ribs 635 that are connected to the outer circumferential surface of the second tubular portion 632, so that even if a large load is applied to the support shaft 7, the second tubular portion 632 can withstand such load.

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

(Fixing structure between case 2 and partition member 6)
In the pump device 1 of this embodiment, the case 2 and the partition member 6 are made of resin. Furthermore, since the support shaft 7 is held in the shaft hole 65 of the partition member 6, a gap G2 is ensured between the support shaft 7 and the receiving portion 280 of the case 2, and a gap is also ensured between the outer circumferential surface of the support shaft 7 and the inner circumferential surface of the cylindrical portion 28. Therefore, a play is ensured between the support shaft 7 and the case 2 to allow the case 2 and the partition member 6 to move relative to each other, so that in the manufacturing process of the pump device 1, the case 2 and the partition member 6 can be fixed by vibration welding.

In vibration welding, the case 2 and the partition member 6 are welded by vibrating them relative to one another. In this embodiment, an annular convex portion is provided on one of the ends of the cylindrical body 64 surrounding the stator 3 from the radial outside in the partition member 6 on one side L1 in the direction of the rotation center axis L, and the ends of the other side L2 in the direction of the rotation center axis L of the side wall 29 of the case 2, and an annular recess is provided on the other side, and the convex portion is vibration welded within the recess. In this embodiment, an annular convex portion 290 is provided on the end of the other side L2 in the direction of the rotation center axis L of the side wall 29, and an annular recess 640 is provided on the end of the one side L1 in the direction of the rotation center axis L of the body 64, and the convex portion 290 is vibration welded within the recess 640.

[Other embodiments]
In the above embodiment, the partition member 6 was a resin sealing member 60 that covered the stator 3 from both radial sides and both sides in the direction of the rotation center axis L. However, the present invention may also be applied to a case in which the partition member 6 is a member that covers the stator 3 from the radial inside and only one side L1 in the direction of the rotation center axis L.

1...pump device, 2...case, 3...stator, 4...rotor, 5...magnet, 6...partition member, 7...support shaft, 10...motor, 11...radial bearing, 12...thrust bearing, 20...pump chamber, 21...suction pipe, 21a...suction port, 22...discharge pipe, 22a...discharge port, 23...wall surface, 24...bottom wall, 25...impeller, 26...disk, 27...support portion, 28...tubular portion, 29...side wall, 31...stator core, 32...insulator, 3 3...coil, 40...cylindrical portion, 44...through hole, 45...flange portion, 60...resin sealing member, 61...first partition wall portion, 62...second partition wall portion, 63...bottom plate portion, 64...body portion, 65...shaft hole, 66...conical surface, 67...annular outer peripheral region, 71...first end portion, 72...second end portion, 280...receiving portion, 321...first flange portion, 322...second flange portion, 631...first tube portion, 632...second tube portion, 635...rib, 651...first hole portion, 652...second hole portion

Claims (6)

The pump includes a motor and an impeller disposed in a pump chamber provided on one side of a rotation central axis of the motor,
the motor includes a cylindrical stator including a stator core around which a coil is wound; a case disposed on one side of the stator to define the pump chamber and to house the impeller; a rotor including a cylindrical portion extending from a position facing the stator on the radial inside toward the pump chamber along the central axis of rotation, the impeller being connected to the cylindrical portion; a magnet held in the cylindrical portion so as to face the stator on the radial inside; and a resin partition member covering the stator;
the partition member has a first partition portion constituting a bottom wall of the pump chamber, and a second partition portion interposed between the stator and the magnet,
The case has a wall surface facing the first partition portion and a side wall extending in a circumferential direction at a position radially outward of the impeller,
The cylindrical portion has a through hole between a portion that holds the magnet and the impeller,
the bottom wall has a conical surface that is inclined so that the radially outer side is located closer to the pump chamber than the radially inner side at the radially outer side of the through hole,
the through hole is provided in a range overlapping with the conical surface when viewed from a direction perpendicular to the rotation central axis,
A pump device, characterized in that , as the impeller rotates, the fluid in the pump chamber is discharged from a discharge pipe communicating with the side wall .
2. The pump device according to claim 1,
The pump device according to claim 1, wherein the bottom wall has an annular outer peripheral region on an outer circumferential side of the conical surface, the annular outer peripheral region being perpendicular to the central axis of rotation. 3. The pump device according to claim 1,
The pump device according to claim 1, wherein the partition member is a resin sealing member that covers the stator from both radial sides and from both sides in the direction of the central axis of rotation. A pump device according to any one of claims 1 to 3,
In the stator, the coil is wound around the stator core via an insulator that covers the stator core,
A pump device characterized in that an imaginary line linearly connecting an end of a first flange portion on the radial inner side of the insulator on the pump chamber side and an end of a second flange portion on the radial outer side of the insulator on the pump chamber side is inclined relative to the central axis of rotation so as to follow the conical surface. A pump device according to any one of claims 1 to 4,
A pump device characterized in that a suction port communicating with the pump chamber is provided concentrically with the central axis of rotation and with an inner diameter larger than an inner diameter of the cylindrical portion with respect to the pump chamber. A pump device according to any one of claims 1 to 5,
A pump device, characterized in that the angle between the conical surface and the central axis of rotation is 45 degrees or more.

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