Pumping apparatus

• US 10,458,413 B2
• Filed: 09/29/2016
• Issued: 10/29/2019
• Est. Priority Date: 09/30/2015
• Status: Active Grant

• Current Assignee: Nidec Sankyo Corporation (Nidec Corporation)
• Original Assignee: Nidec Sankyo Corporation (Nidec Corporation)
• Inventors: Otsubo, Keishi
• Primary Examiner(s): Mullins, Burton S
• Application Number:
  US15/279,440
• Publication Number:
  US 20170093252A1
• Time in Patent Office: 1,125 Days
• Field of Search: 310194, 310 86, 41742311, 41742314, 4174241
• CPC Class Codes: F04D 13/0606 Canned motor pumps
• CPC Class Codes: F04D 13/0626 Details of the can
• CPC Class Codes: F04D 13/064 Details of the magnetic circuit
• CPC Class Codes: F04D 29/22 specially for centrifugal pumps
• CPC Class Codes: F04D 29/628 especially adapted for liquid pumps
• CPC Class Codes: H02K 1/14 Stator cores with salient poles
• CPC Class Codes: H02K 1/146 consisting of a generally annular yoke with salient poles
• CPC Class Codes: H02K 1/18 Means for mounting or fastening magnetic stationary parts on to, or to, the stator structures
• CPC Class Codes: H02K 11/0094 Structural association with other electrical or electronic devices
• CPC Class Codes: H02K 5/10 with arrangements for protection from ingress, e.g. water or fingers
• CPC Class Codes: H02K 5/128 using air-gap sleeves or air-gap discs
• CPC Class Codes: H02K 7/08 Structural association with bearings
• CPC Class Codes: H02K 7/086 radially supporting the rotor around a fixed spindle; radially supporting the rotor directly H02K7/09 takes precedence
• CPC Class Codes: H02K 7/14 Structural association with mechanical loads, e.g. with hand-held machine tools or fans with fan or impeller for cooling the machine H02K9/06

Abstract

In the pumping apparatus of the invention, a circuit board is secured to a portion of a partition wall member on a side of a first direction, and disposed closer to the side of the first direction than a stator core and an insulation member. A portion of a terminal pin on the side of the first direction is secured to the circuit board, and a portion of the terminal pin on a side of a second direction is secured to the insulation member. A first contact surface facing the side of the first direction is formed on the insulation member. A second contact surface is formed on the partition wall member. The second contact surface faces the side of the second direction. Also, the first contact surface is in contact with the second contact surface to restrict a movement of the stator in the first direction.

Claims

1. A pumping apparatus, comprising:

an impeller;

a rotor, installed with the impeller and having a driving magnet;

a stator, formed in a tubular shape and disposed on an outer circumference side of the rotor, and having a driving coil;

a pump chamber, disposed with the impeller and the rotor, and allowing a fluid to pass through;

a partition wall member, disposed between the stator and the pump chamber, and preventing the fluid in the pump chamber from flowing into a position where the stator is disposed;

a circuit board, disposed outside the pump chamber, and secured on the partition wall member; and

a resin sealing member made by a resin, covering the stator and the circuit board, and

the stator comprising;

an insulation member;

a stator core, having a plurality of salient poles, wherein the driving coil is wound on the plurality of salient poles through the insulation member; and

a plurality of terminal pins, electrically connected to an end portion of the driving coil, and disposed in parallel to an axial direction of the stator formed in the tubular shape,

wherein the stator has a first side and a second side opposite to the first side, one direction of the axial direction is set as a first direction and an opposite direction of the first direction is set as a second direction, the first side of the stator that faces the first direction is set as a first direction side and the second side of the stator that faces the second direction is set as a second direction side,

the circuit board is secured on a portion of the partition wall member on the first direction side and disposed closer to the first direction side than the stator core and the insulation member,

a portion of the terminal pin on the first direction side is secured to the circuit board,

a portion of the terminal pin on the second direction side is secured to the insulation member,

a first contact surface facing the first direction side is formed on the insulation member,

a second contact surface is formed on the partition wall member, the second contact surface faces the second direction side, and the first contact surface is in contact with the second contact surface to restrict a movement of the stator in the first direction,

wherein a third contact surface facing the second direction side is formed on the insulation member,

a fourth contact surface is formed on the partition wall member, the fourth contact surface faces the first direction side, and the third contact surface is in contact with the fourth contact surface to restrict a movement of the stator in the second direction,

the stator core comprises an outer circumference ring formed in a ring shape and a plurality of the salient poles protruding from the outer circumference ring to an inner side of a radial direction of the stator,

the third contact surface is formed on an axial covering portion, and the axial covering portion covers a part of the outer circumference ring in a circumferential direction of the stator from the second direction side,

the partition wall member comprises a cylindrical portion disposed between the rotor and the stator, a bottom for sealing an end of the cylindrical portion in the first direction, and a flange portion expended from an end of the cylindrical portion in the second direction to an outer side of the stator in the radial direction,

wherein the first contact surface is formed on the axial covering portion, and

the second contact surface and the fourth contact surface are formed on the flange portion.

2. The pumping apparatus according to claim 1, wherein

the third contact surface and the fourth contact surface are formed in a planar shape.

3. The pumping apparatus according to claim 1, wherein

the insulation member comprises a plurality of divided insulation members which are divided in the circumferential direction of the stator,

a number of the divided insulation members among the plurality of divided insulation members are a restrictive divided insulation member formed with the first contact surface in contact with the second contact surface, and

the third contact surface in contact with the fourth contact surface is formed at least on the restrictive divided insulation member.

4. The pumping apparatus according to claim 3, wherein

the partition wall member comprises a cylindrical portion disposed between the rotor and the stator, a bottom for sealing an end of the cylindrical portion in the first direction, and a flange portion expended from an end of the cylindrical portion in the second direction to an outer side of the stator in the radial direction,

wherein a projection having a quantity equal to a total of the divided insulation members is formed on a surface of the flange portion on the first direction side separating from one another in the circumferential direction by a predetermined pitch and protruding to the first direction side,

a surface of the projection on the first direction side is the fourth contact surface,

the third contact surface in contact with the fourth contact surface is formed on all of the divided insulation members, and

the third contact surfaces of adjacent two of the divided insulation members in the circumferential direction are in contact with the fourth contact surface of one of the projection.

5. The pumping apparatus according to claim 1, wherein

the partition wall member comprises a cylindrical portion disposed between the rotor and the stator, a bottom for sealing an end of the cylindrical portion in the first direction, and a flange portion expended from an end of the cylindrical portion in the second direction to an outer side of the stator in a radial direction of the stator,

wherein a projection having a quantity equal to a total of the salient poles is formed on a surface of the flange portion on the first direction side separating from one another in a circumferential direction of the stator by a predetermined pitch and protruding to the first direction side, and

a surface of the projection on the first direction side is the fourth contact surface.

6. A pumping apparatus comprising:

an impeller;

a rotor, installed with the impeller and having a driving magnet;

a stator, formed in a tubular shape and disposed on an outer circumference side of the rotor, and having a driving coil;

a pump chamber, disposed with the impeller and the rotor, and allowing a fluid to pass through;

a partition wall member, disposed between the stator and the pump chamber, and preventing the fluid in the pump chamber from flowing into a position where the stator is disposed;

a circuit board, disposed outside the pump chamber, and secured on the partition wall member; and

a resin sealing member made by a resin, covering the stator and the circuit board, and

the stator comprising;

an insulation member;

a stator core, having a plurality of salient poles, wherein the driving coil is wound on the plurality of salient poles through the insulation member; and

a plurality of terminal pins, electrically connected to an end portion of the driving coil, and disposed in parallel to an axial direction of the stator formed in the tubular shape,

wherein the stator has a first side and a second side opposite to the first side, one direction of the axial direction is set as a first direction and an opposite direction of the first direction is set as a second direction, the first side of the stator that faces the first direction is set as a first direction side and the second side of the stator that faces the second direction is set as a second direction side,

the circuit board is secured on a portion of the partition wall member on the first direction side and disposed closer to the first direction side than the stator core and the insulation member,

a portion of the terminal pin on the first direction side is secured to the circuit board,

a portion of the terminal pin on the second direction side is secured to the insulation member,

a first contact surface facing the first direction side is formed on the insulation member,

a second contact surface is formed on the partition wall member, the second contact surface faces the second direction side, and the first contact surface is in contact with the second contact surface to restrict a movement of the stator in the first direction, wherein

the insulation member comprises a first engaging portion formed with the first contact surface,

the partition wall member comprises a second engaging portion formed with the second contact surface, and

at least one of the first engaging portion and the second engaging portion is elastically deformable in a radial direction of the stator to engage the first engaging portion and the second engaging portion together through a snap-fit,

the stator core comprises an outer circumference ring formed in a ring shape and a plurality of the salient poles protruding from the outer circumference ring to an inner side of the radial direction,

the first engaging portion is formed on an axial covering portion, and the axial covering portion covers a part of the outer circumference ring in a circumferential direction of the stator from the second direction side.

7. The pumping apparatus according to claim 6, wherein

the first engaging portion is engaged with the second engaging portion at an inner side of the radial direction,

a first inclined surface is formed on an outer portion in the radial direction of a surface of the first engaging portion on the second direction side, and the first inclined surface is inclined toward the first direction side facing an outer side of the radial direction.

8. The pumping apparatus according to claim 6, wherein

the first engaging portion is engaged with the second engaging portion at an inner side of the radial direction,

a second inclined surface is formed on an inner portion in the radial direction of a surface of the second engaging portion on the first direction side, and the second inclined surface is inclined toward the second direction side facing the inner side of the radial direction.

9. The pumping apparatus according to claim 6, wherein

the second engaging portion is disposed on two positions by sandwiching a center of the stator when inspecting from the axial direction,

wherein if an orthogonal direction of a direction passing through the second engaging portions disposed on the two positions in the radial direction is set as a third direction,

a gate track is formed on one of lateral surfaces of the resin sealing member in the third direction, and the gate track is a track of an inlet for the resin used when the resin sealing member is formed by an injection molding.

10. The pumping apparatus according to claim 6, wherein

a width of one of the first contact surface and the second contact surface in the radial direction is narrower than a width of another one of the first contact surface and the second contact surface in the radial direction.

11. The pumping apparatus according to claim 6, wherein

the axial covering portion comprises:

two contact surfaces forming portions, formed with the third contact surface facing the second direction side, and disposed on two sides of the first engaging portion in the circumferential direction, respectively; and

a first connecting portion, connecting the two contact surfaces forming portions with the first engaging portion on the first direction side,

wherein a fourth contact surface is formed on the partition wall member, the fourth contact surface faces the first direction side, and the third contact surface is in contact with the fourth contact surface to restrict a movement of the stator in the second direction,

wherein the first engaging portion is formed in an elastic sheet shape elastically deformable in the radial direction, and

the second engaging portion is formed as a portal which comprises two upstanding portions and a second connecting portion, wherein the two upstanding portions are disposed separating from each other in the circumferential direction by a predetermined pitch and rising to the first direction side, the second connecting portion connects ends of the two upstanding portions in the first direction to each other,

a surface of the second connecting portion on the second direction side is the second contact surface,

the first engaging portion is engaged with the second engaging portion, and

a space between the two contact surfaces forming portions on the side of a lateral surface of the first engaging portion in the circumferential direction is wider than a width of the second engaging portion in the circumferential direction.

12. The pumping apparatus according to claim 6, wherein

the axial covering portion comprises:

two contact surfaces forming portions, formed with the third contact surface facing the second direction side, and disposed on two sides of the first engaging portion in the circumferential direction, respectively; and

a first connecting portion, connecting the two contact surfaces forming portions with the first engaging portion on the first direction side,

wherein a fourth contact surface is formed on the partition wall member, the fourth contact surface faces the first direction side, and the third contact surface is in contact with the fourth contact surface to restrict a movement of the stator in the second direction,

wherein a circumferential direction contact portion is formed on the partition wall member, wherein the circumferential direction contact portion is in contact with a lateral surface, which is opposite to a lateral surface of the first engaging portion, of each of the two contact surfaces forming portions.

13. The pumping apparatus according to claim 6, wherein

the axial covering portion comprises:

two contact surfaces forming portions, formed with the third contact surface facing the second direction side, and disposed on two sides of the first engaging portion in the circumferential direction, respectively; and

a first connecting portion, connecting the two contact surfaces forming portions with the first engaging portion on the first direction side,

wherein a fourth contact surface is formed on the partition wall member, the fourth contact surface faces the side of the first direction side, and the third contact surface is in contact with the fourth contact surface to restrict a movement of the stator in the second direction,

wherein the first engaging portion is formed in an elastic sheet shape elastically deformable in the radial direction, and a front end portion of the first engaging portion has a projection protruding to an outer side of the radial direction,

wherein a surface of the projection on the first direction side is the first contact surface, and

the second engaging portion is formed as a portal which comprises two upstanding portions and a second connecting portion, wherein the two upstanding portions are disposed separating from each other in the circumferential direction by a predetermined pitch and rising to the first direction side, the second connecting portion connects ends of the two upstanding portions in the first direction to each other,

a surface of the second connecting portion on the second direction side is the second contact surface, and

the first engaging portion is engaged with the second engaging portion.