JP2022020100A - Pump device - Google Patents

Abstract

To provide a pump device capable of holding a support shaft for rotatably supporting a rotor on a resin-made partition wall member without using insert molding.SOLUTION: In a pump device 1, a first end 71 of a support shaft 7 is fixed to a first hole portion 651 of a shaft hole 65 of a resin-made partition wall member 6, and is prevented from rotation by a second hole portion 652 of the shaft hole 65. A gap G2 between the end face of a second end 72 and a receiving portion 280 is smaller than a dimension G1 in the direction of a rotation center axis L of the first end 71 located in the inside of the second hole portion 652, so that the first end 71 does not come out of the first hole portion 652 even when temperature rises to loosen fixing in the first hole portion 651 and the supporting shaft 7 is moved toward a receiving portion 280 side. The first hole portion 651 includes an inner portion of a first cylindrical part 631 which protrudes from a bottom plate portion 63 toward a pump chamber 20 side, and the second hole portion 652 is provided at an inner portion of a second bottomed cylindrical part 632 which protrudes at the bottom plate portion 63 toward the opposite side of the pump chamber 20.SELECTED DRAWING: Figure 2

Description

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

In the pump device, the impeller arranged in the pump chamber is rotated by the pump. In the pump, the stator is covered with a resin bulkhead member, and the rotor is rotatably supported by a support shaft supported by the bulkhead member. In the structure in which the support shaft is supported by the partition wall member, when the partition wall member is formed by insert molding so as to cover the stator, the support shaft is also insert-molded (see Patent Document 1).

Japanese Unexamined Patent Publication No. 2019-2368

The partition wall member used in the pump device needs to be provided with a first partition wall portion that covers the stator from the side of the pump chamber and a second partition wall portion that is interposed between the stator and the rotor. Therefore, the support shaft is arranged at the bottom of the recess surrounded by the second partition wall. Therefore, when the support shaft is insert-molded, the second partition wall portion is formed around the mold that holds the support shaft, so that there is a problem that the structure of the mold is complicated.

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 by a resin partition wall member without using insert molding. It is in.

In order to solve the above problems, the pump device according to the present invention includes a case provided with an suction port and a discharge port, and a motor provided with a stator and a rotor, and the motor covers the stator and the case. A resin partition wall member for partitioning a pump chamber in which an impeller is arranged is provided with a support shaft for rotatably supporting the rotor, and the partition wall member includes the pump chamber of the support shaft. Is formed with a shaft hole into which the first end on the opposite side is fitted, and in the case, the support shaft faces the second end on the pump chamber side of the support shaft on the side of the pump chamber. A receiving portion that limits the movable range to the pump chamber side is formed, and the shaft hole communicates with the first hole portion to which the first end portion is fixed and the first hole portion on the opposite side of the pump chamber. A second hole portion that engages with the first end portion to prevent the rotation of the support shaft is provided, and the gap between the second end portion and the receiving portion is inside the second hole portion. It is characterized in that it is narrower than the dimension in the rotation center axis direction of the first end portion located in.

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 used as a partition wall member without using insert molding that requires a mold having a complicated structure. Can be held in. Further, since the second hole portion of the shaft hole prevents the support shaft from rotating, the support shaft can be held in a stable state by the partition wall member. Further, since the gap between the second end portion and the receiving portion is narrower than the dimension in the rotation center axis direction of the first end portion located inside the second hole portion, the support shaft in the first hole portion due to temperature rise or the like. Even when the fixing is loosened and the support shaft moves to the receiving portion side, the first end portion does not come off from the second hole portion. Therefore, the rotation of the support shaft can be prevented.

In the present invention, the shaft hole is formed in the bottom plate portion of the partition wall member, and the first hole portion includes an inner portion of a first cylinder portion protruding from the bottom plate portion toward the pump chamber. As the second hole portion, an embodiment provided in the inner portion of the bottomed second cylinder portion that protrudes from the bottom plate portion toward the side opposite to the pump chamber can be adopted. According to such an aspect, it is possible to secure an appropriate dimension in the direction of the rotation center axis in each of the first hole portion and the second hole portion.

In the present invention, it is possible to adopt an embodiment in which the bottom plate portion is provided with a plurality of ribs connected to the outer peripheral surface of the second cylinder portion. According to this aspect, even when a large load is applied to the support shaft, the second cylinder portion can withstand the applied load.

In the present invention, the wall thickness of the first cylinder portion can be thinner than the wall thickness of the second cylinder portion.

In the present invention, in the second hole portion, the rotation of the support shaft is prevented by overlapping the flat surface portion formed on the inner peripheral surface of the second hole portion and the flat surface portion formed on the outer peripheral surface of the support shaft. Can be adopted.

In the present invention, it is possible to adopt an embodiment in which the opening edge of the shaft hole on the pump chamber side is an inclined surface. According to such an embodiment, the support shaft can be easily fitted into the shaft hole.

In the present invention, the partition wall member may be 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 support shaft can be fixed to the partition wall member by press fitting into the first hole portion.

In the present invention, the case and the partition wall member can be fixed by vibration welding. In this case, the case is formed with a tubular portion in which the support shaft is located inside, and the receiving portion is formed by the bottom portion of the tubular portion on one side in the direction of the rotation center axis. A mode in which a gap is provided between the outer peripheral surface and the inner peripheral surface of the tubular portion can be adopted.

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 used as a partition wall member without using insert molding that requires a mold having a complicated structure. Can be held in. Further, since the second hole portion of the shaft hole prevents the support shaft from rotating, the support shaft can be held in a stable state by the partition wall member. Further, since the gap between the second end portion and the receiving portion is narrower than the dimension in the rotation center axis direction of the first end portion located inside the second hole portion, the support shaft in the first hole portion due to temperature rise or the like. Even when the fixing is loosened and the support shaft moves to the receiving portion side, the first end portion does not come off from the second hole portion. Therefore, the rotation of the support shaft can be prevented.

The perspective view which shows one aspect of the pump device to which this invention is applied. The vertical sectional view of the pump device shown in FIG. An exploded perspective view of the pump device shown in FIG. 1. FIG. 3 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 center axis of rotation. An exploded perspective view of the motor shown in FIG. 2 as viewed from one side in the direction of the center axis of rotation. The exploded perspective view of the motor shown in FIG. 2 as seen from the other side in the rotation center axis L direction.

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

(overall structure)
FIG. 1 is a perspective view showing one aspect of the pump device 1 to which the present invention is applied. FIG. 2 is a vertical sectional view of the pump device 1 shown in FIG. FIG. 3 is an exploded perspective view of the pump device 1 shown in FIG. 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 rotation center axis L direction. FIG. 5 is an exploded perspective view of the motor 10 shown in FIG. 2 as viewed from one side L1 in the rotation center axis L direction. FIG. 6 is an exploded perspective view of the motor 10 shown in FIG. 2 as viewed from the other side L2 in the rotation center axis L direction.

In FIGS. 1, 2 and 3, the pump device 1 has a case 2 having a suction port 21a and a discharge port 22a, a motor 10 having a stator 3 and a rotor 4, and a rotation center axis L with respect to the motor 10. It is provided with an impeller 25 arranged in a pump chamber 20 provided on one side L1 in the direction. The stator 3 has a cylindrical shape. The motor 10 includes a resin partition wall 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 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 likely to change.

The case 2 constitutes a wall surface 23 of L1 on one side of the rotation center axis L direction of the pump chamber 20 and a side wall 29 extending in the circumferential direction. The case 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 are provided. Each end is provided with a suction port 21a and a discharge port 22a. The suction pipe 21 and the suction port 21a are provided concentrically 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 will be omitted, the stator core 31 includes an annular portion extending in an annular shape and a plurality of salient poles protruding inward in the radial direction from the annular portion. The coil 33 is wound between the radial inner first flange portion 321 and the radial outer second flange portion 322 of the insulator 32 that covers the salient pole. 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 radially inward from a position facing the stator 3 toward the pump chamber 20 along the rotation center axis L, and the cylindrical portion 40 is opened in the pump chamber 20. ing. The cylindrical portion 40 is concentric with respect to the suction pipe 21 and the suction port 21a. In this 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 on the inner side in the radial direction. In the present embodiment, the rotor 4 has an annular portion 41 that overlaps the magnet 5 from one side L1 in the rotation center axis L direction and an annular portion that protrudes from the outer edge of the annular portion 41 to the other side L2 in the rotation center axis L direction. A convex portion 42 is formed, and the convex portion 42 covers the end portion of L1 on one side in the rotation center axis L direction of the magnet 5 from the radial outside. Corresponding to such a configuration, the end portion of L1 on one side of the rotation center axis L direction of the magnet 5 is an annular portion 51 overlapping the annular portion 41 inside the convex portion 42 and a radial outer side of the annular portion 51. An annular recess 52 recessed in L2 on the other side of the rotation center axis L direction is formed, and the convex portion 42 overlaps the recess 52. At that time, an adhesive is applied between the magnet 5 and the rotor 4, and the magnet 5 and the rotor 4 are adhered to each other.

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 has a convex portion 43 (FIG. 6) that fits into the concave portion 53. See) is formed. Therefore, the convex portion 43 fits into the concave portion 53 to prevent the magnet 5 from rotating with respect to the rotor 4. In the present embodiment, the convex portion 43 has a trapezoidal cross-sectional shape in which the ends located on both sides in the circumferential direction are inclined surfaces, and the concave portion 53 has wall portions located on both sides in the circumferential direction as inclined surfaces. It has a trapezoidal cross section or a rectangular cross section. Further, when the convex portion 43 fits into the concave portion 53, the convex portion 43 comes into contact with the wall portion of the concave portion 53. Therefore, even if the height dimension of the convex portion 43 and the depth dimension of the concave portion 53 vary, the magnet 5 can be properly positioned in the rotation center axis L direction, and the magnet 5 rattles with respect to the rotor 4. Can be prevented.

In this embodiment, the magnet 5 is a neodymium bond magnet. The magnet is entirely covered with a resin skin layer. However, at the place where the gate was located when the magnet 5 was formed, the metal was not covered with the skin layer and the metal was exposed, so that rust was likely to occur. Therefore, in the present embodiment, the magnet 5 is formed by arranging a gate at the bottom of the recess 52 or the bottom of the recess 53 in the end face of L1 on one side in the rotation center axis L direction of the magnet 5. Therefore, the portion where the gate was located when the magnet 5 was formed is covered with the adhesive after the magnet 5 and the rotor 4 are adhered to each other. Therefore, it is possible to suppress the occurrence of rust at the place where the gate was located. As shown in FIGS. 5 and 6, a ring 15 for preventing the magnet 5 from cracking or the like is mounted on the surface of the magnet 5 opposite to the pump chamber 20.

As shown in FIGS. 2, 3 and 4, in the rotor 4 of the present embodiment, a disk-shaped flange portion 45 is formed at the end of L1 on one side in the rotation center axis L direction of the cylindrical portion 40. A disk 26 is connected to the flange portion 45 from one side L1 in the rotation center axis L direction. A central hole 260 is formed in the center of the disk 26, and the surface of the disk 26 facing the flange portion 45 extends radially outward from the periphery of the central hole 260 while being curved in an arc shape. A plurality of blade portions 261 are formed at equal angular intervals. Each of the plurality of blade portions 261 is formed with a convex portion 262 protruding toward the flange portion 45.

The flange portion 45 is formed with a groove 451 into which the end portion of the blade portion 261 on the flange portion 45 side is fitted, and the bottom portion of the groove portion 451 is formed with a hole 452 into which the convex portion 262 is fitted. Therefore, when the disk 26 is overlapped and fixed on the flange portion 45 so as to fit the convex portion 262 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. Will be done. In the present embodiment, the disk 26 is tilted 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 FIGS. 2, 5 and 6, the rotor 4 holds a cylindrical radial bearing 11 radially inside the cylindrical portion 40 by a method such as caulking, and the rotor 4 is a radial bearing 11. It is rotatably supported by the support shaft 7 via the support shaft 7. The support shaft 7 is held by the partition wall member 6 as described later.

The partition wall member 6 has a first partition wall portion 61 constituting a bottom wall 24 facing the wall surface 23 of the pump chamber 20, and a second partition wall 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 that covers the stator 3 from both sides in the radial direction and both sides in the rotation center axis L direction, and when the stator 3 is insert-molded by BMC (Bulk Molding Compound) or the like. It is the resin part of. In this embodiment, the material of the resin sealing member 60 is polyphenylene sulfide (PPS: Poly Phenylene Sulfide).

In the present embodiment, a cover 18 is fixed to the resin sealing member 60 from the other side L2 in the rotation center axis L direction, and a circuit for controlling power supply to the coil 33 between the cover 18 and the resin sealing member 60. The substrate 19 provided with the above is arranged. Further, a connector housing 69 is formed on the partition wall member 6. Therefore, when the connector is connected to the connector housing 69 to supply power or the like, the rotor 4 rotates around 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 a 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 the cylindrical portion 40 of the rotor 4 and the like)
In the motor 10 of the present 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 holes 44 are provided at two positions in the cylindrical portion 40, which are offset by 180 degrees from each other at an 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 is inclined so that the radial outside of the through hole 44 is located on the side of the pump chamber 20 from the radial inside. It has a conical surface 66. Corresponding to such a configuration, the end portion of the first flange portion 321 on the radial inner side of the insulator 32 on the pump chamber 20 side and the end portion of the second flange portion 322 on the radial outer side of the insulator 32 on the pump chamber 20 side are formed. The imaginary line P connecting linearly is inclined along the conical surface 66 with respect to the rotation center axis L. In this embodiment, the angle θ formed by the conical surface 66 and the rotation center axis L is 45 degrees or more.

Further, the bottom wall 24 is provided with an annular outer peripheral region 67 orthogonal to the rotation center axis L on the outer peripheral side of the conical surface 66. In the present embodiment, the conical surface 66 overlaps from an intermediate position in the radial direction of the impeller 25 to a position slightly inside the outer edge, and the annular outer peripheral region 67 is formed so as to project radially outward from the outer edge of the impeller 25. ing. Therefore, the outer peripheral portion of the annular outer peripheral region 67 does not face the impeller 25 but directly overlaps the pump chamber 20.

As described above, in the pump device 1 of the present embodiment, the cylindrical portion 40 of the rotor 4 is provided with a through hole 44 between the portion holding the magnet 5 and the impeller 25. Therefore, when the impeller 25 rotates, a part of the fluid flows from the pump chamber 20 into the cylindrical portion 40 of the rotor 4, and then passes through the through hole 44 of the cylindrical portion 40 and again along the bottom wall 24. Flow to. Therefore, the air mixed in 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 radial outer side of the through hole 44 is located on the side of the pump chamber 20 than the radial inner side. Therefore, since the pressure of the fluid 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, it is possible to prevent foreign matter from moving from the pump chamber 20 between the magnet 5 held by the rotor 4 and the second partition wall portion 62. Therefore, it is unlikely that a foreign substance is caught between the magnet 5 and the second partition wall portion 62 and the rotation of the rotor 4 is hindered.

Further, 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 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 has an annular outer peripheral region 67 orthogonal to the rotation center axis L on the outer peripheral side of the conical surface 66, the fluid passes through the outer peripheral side of the impeller 25 on the outer peripheral side of the bottom wall 24. It can be smoothly discharged to the pump chamber 20.

Further, a virtual connection between the end portion of the first flange portion 321 on the radial inner side of the insulator 32 on the pump chamber 20 side and the end portion of the second flange portion 322 on the radial outer side of the insulator 32 on the pump chamber 20 side is linearly connected. The line P is inclined along the conical surface 66 with respect to the rotation center axis L, and the structure of the insulator 32 and the shape of the bottom wall 24 correspond to each other. 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 is provided concentrically with respect to the rotation center axis L with an inner diameter φa larger than the inner diameter φb of the cylindrical portion 40, the fluid in the side wall 29 of the pump chamber 20 The speed can be reduced. Therefore, the foreign matter stays in the region along the side wall 29 of the pump chamber 20 and is difficult to flow into the cylindrical portion 40. Therefore, it is unlikely that the foreign matter moves from the cylindrical portion 40 through the through hole 44 between the magnet 5 and the second partition wall portion 62.

(Fixed structure of support shaft 7)
As shown in FIG. 2, the partition wall member 6 is formed with a shaft hole 65 into which a first end portion 71 on the side opposite to the pump chamber 20 of the support shaft 7 is fitted. On the other hand, in the case 2, the receiver that faces the second end portion 72 of the support shaft 7 on the pump chamber 20 side on the side of the pump chamber 20 and limits the movable range of the support shaft 7 toward the pump chamber 20 side. The portion 280 is formed.

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 that communicates with the first hole portion 651 on the opposite side of the pump chamber 20. The 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 wall member 6 by press fitting into the first hole portion 651.

In the present embodiment, in the second hole portion 652, the rotation of the support shaft 7 is prevented by overlapping the flat surface portion formed on the inner peripheral surface of the second hole portion 652 and the flat surface portion formed on the outer peripheral surface of the support shaft 7. To. For example, both the first end portion 71 and the second hole portion 652 are formed in a D-shaped 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 with each other, the second hole portion 652 engages with the first end portion 71 to rotate the support shaft 7. To prevent.

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

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

In this embodiment, the case 2 includes three support portions 27 extending from the inner peripheral surface of the suction pipe 21 to the side of the motor 10. At the end of the support portion 27, a tubular portion 28 in which the support shaft 7 is located inside is formed, and the receiving portion 280 is formed by the bottom portion of L1 on one side in the rotation center axis L direction of the tubular portion 28. .. A gap is provided between the outer peripheral surface of the support shaft 7 and the inner peripheral surface of the tubular portion 28, and the receiving portion 280 passes through the gap G2 on the end surface on the side of the second end portion 72 of the support shaft 7. Facing each other. 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 rotation center axis L direction of the first end portion 71 located inside the second hole portion 652.

An annular thrust bearing 12 is mounted on the second end 72 of the support shaft 7, and the thrust bearing 12 is arranged between the radial bearing 11 and the tubular portion 28. Here, the second end portion 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.

As described above, in the pump device 1 of the present 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 wall 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, in order to prevent the support shaft 7 from rotating by the second hole portion 652 of the shaft hole 65, the support shaft 7 can be held in a stable state by the partition wall member 6. 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 rotation center axis L direction of the first end portion 71 located inside the second hole portion 652, the temperature rises. Then, even when the support shaft 7 is loosened in the first hole portion 651 and the support shaft 7 moves to the receiving portion 280 side, the first end portion 71 does not come off from the second hole portion 652. Therefore, it is possible to prevent the support shaft 7 from rotating. Even when the temperature rises and the fixing of the support shaft 7 in the first hole portion 651 is loosened, if the temperature drops, the fixing of the support shaft 7 in the first hole portion 651 is tightened.

Further, the first hole portion 651 includes an inner portion of the first cylinder portion 631 protruding from the bottom plate portion 63 toward the pump chamber 20, and the second hole portion 652 is the bottom plate portion 63 on the opposite side of the pump chamber 20. It is provided on the inner portion of the bottomed second cylinder portion 632 that protrudes toward. Therefore, it is possible to secure appropriate dimensions in the rotation center axis L direction in each of the first hole portion 651 and the second hole portion 652. Further, since the bottom plate portion 63 is provided with a plurality of ribs 635 connected to the outer peripheral surface of the second cylinder portion 632, even when a large load is applied to the support shaft 7, the second cylinder portion 632 receives the load. Can withstand.

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.

(Fixed structure between case 2 and partition wall member 6)
In the pump device 1 of this embodiment, the case 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 case 2, and the outer peripheral surface of the support shaft 7 and the cylinder A gap is also secured between the inner peripheral surface of the portion 28 and the inner peripheral surface of the portion 28. Therefore, since a play for relatively moving the case 2 and the partition wall member 6 is secured between the support shaft 7 and the case 2, in the manufacturing process of the pump device 1, the case 2 and the partition wall member 6 are used. It can be fixed by vibration welding.

In vibration welding, the case 2 and the partition wall member 6 are relatively vibrated to perform welding. In this embodiment, in the partition wall member 6, the end of L1 on one side of the cylindrical body portion 64 that surrounds the stator 3 from the outside in the radial direction in the rotation center axis L direction, and the other end of the side wall 29 of the case 2 in the rotation center axis L direction. An annular convex portion is provided on one of the ends of the side L2, and an annular concave portion is provided on the other, and the convex portion is oscillatedly welded in the concave portion. In this embodiment, an annular convex portion 290 is provided at the end of the other side L2 of the side wall 29 in the rotation center axis L direction, and an annular concave portion is provided at the end of the one side L1 of the body portion 64 in the rotation center axis L direction. A 640 is provided, and the convex portion 290 is oscillatedly welded in the concave portion 640.

[Other embodiments]
In the above embodiment, the partition wall member 6 is a resin sealing member 60 that covers the stator 3 from both sides in the radial direction and both sides in the rotation center axis L direction, but the partition wall member 6 covers the stator 3 in the radial direction and inside. The present invention may be applied when the member covers only one side L1 in the rotation center axis L direction.

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 part, 28 ... cylinder part, 29 ... Side wall, 31 ... Stator core, 32 ... Insulator, 33 ... Coil, 40 ... Cylindrical part, 44 ... Through hole, 45 ... Flange part, 60 ... Resin sealing member, 61 ... First partition wall part, 62 ... Second partition wall part, 63 ... bottom plate, 64 ... body, 65 ... shaft hole, 66 ... conical surface, 67 ... annular outer peripheral region, 71 ... first end, 72 ... second end, 280 ... receiving, 321 ... first bearing 322 ... 2nd flange, 631 ... 1st cylinder, 632 ... 2nd cylinder, 635 ... rib, 651 ... 1st hole, 652 ... 2nd hole

Claims (10)

A case with a suction port and a discharge port,
With a motor with a stator and rotor,
Equipped with
The motor includes a resin partition member that covers the stator and partitions a pump chamber in which an impeller is arranged, and a support shaft that rotatably supports the rotor.
The partition wall member is formed with a shaft hole into which a first end portion of the support shaft opposite to the pump chamber is fitted.
In the case, a receiving portion is formed on the second end portion of the support shaft on the pump chamber side so as to face the pump chamber side and limit the movable range of the support shaft toward the pump chamber side.
The shaft hole communicates with the first hole portion to which the first end portion is fixed and the first hole portion on the opposite side of the pump chamber, and engages with the first end portion to form the support shaft. Equipped with a second hole to prevent rotation,
A pump device characterized in that the gap between the second end portion and the receiving portion is narrower than the dimension in the rotation center axis direction of the first end portion located inside the second hole portion. In the pump device according to claim 1,
The shaft hole is formed in the bottom plate portion of the partition wall member, and is formed.
The first hole portion includes an inner portion of the first cylinder portion protruding from the bottom plate portion toward the pump chamber.
The pump device is characterized in that the second hole portion is provided in an inner portion of a bottomed second cylinder portion that protrudes from the bottom plate portion toward a side opposite to the pump chamber. In the pump device according to claim 2,
A pump device characterized in that the bottom plate portion is provided with a plurality of ribs connected to an outer peripheral surface of the second cylinder portion. In the pump device according to claim 2 or 3.
A pump device characterized in that the wall thickness of the first cylinder portion is thinner than the wall thickness of the second cylinder portion. In the pump device according to any one of claims 1 to 4.
In the second hole portion, the rotation of the support shaft is prevented by overlapping the flat surface portion formed on the inner peripheral surface of the second hole portion and the flat surface portion formed on the outer peripheral surface of the support shaft. A featured pumping device. In the pump device according to any one of claims 1 to 5.
A pump device characterized in that the opening edge of the shaft hole on the pump chamber side is an inclined surface. In the pump device according to any one of claims 1 to 6.
The pumping device is characterized in that 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 pump device according to any one of claims 1 to 7.
The pump device is characterized in that the support shaft is fixed to the partition wall member by press fitting into the first hole portion. In the pump device according to any one of claims 1 to 8.
The case is a pump device characterized in that it is fixed to the partition wall member by vibration welding. In the pump device according to claim 9,
In the case, a tubular portion in which the support shaft is located inside is formed.
The receiving portion is formed by the bottom portion of the cylinder portion on one side in the direction of the rotation center axis.
A pump device characterized in that a gap is provided between the outer peripheral surface of the support shaft and the inner peripheral surface of the tubular portion.

Images