Waterproof axial flow fan

• US 9,869,321 B2
• Filed: 12/15/2014
• Issued: 01/16/2018
• Est. Priority Date: 12/18/2013
• Status: Active Grant

• Current Assignee: Sanyo Denki Company Limited (Panasonic Holdings Corporation)
• Original Assignee: Sanyo Denki Company Limited (Panasonic Holdings Corporation)
• Inventors: Ishihara, Katsumichi, Nakayama, Akira, Midorikawa, Tatsuya, Kakeyama, Masato
• Primary Examiner(s): KRAMER, DEVON C
• Assistant Examiner(s): Doyle, Benjamin
• Application Number:
  US14/570,108
• Publication Number:
  US 20150167682A1
• Time in Patent Office: 1,128 Days
• Field of Search: 41742311, 4174235, 417354, 310 87, 310 88, 310 43, 310 67 R, 310 90, 310 85, 310 89, 3102611
• CPC Class Codes: F04D 19/002 Axial flow fans
• CPC Class Codes: F04D 25/0613 the electric motor being of the inside-out type, i.e. the rotor is arranged radially outside a central stator
• CPC Class Codes: F04D 25/0646 Details of the stator
• CPC Class Codes: F04D 25/0686 specially adapted for submerged use
• CPC Class Codes: F04D 29/023 especially adapted for elastic fluid pumps
• CPC Class Codes: H02K 15/10 Applying solid insulation to windings, stators or rotors
• CPC Class Codes: H02K 2205/09 Machines characterised by drain passages or by venting, breathing or pressure compensating means
• CPC Class Codes: H02K 5/08 Insulating casings
• CPC Class Codes: H02K 5/10 with arrangements for protection from ingress, e.g. water or fingers
• CPC Class Codes: H02K 5/12 specially adapted for operating in liquid or gas combined with cooling arrangements H02K9/00
• CPC Class Codes: H02K 5/16 Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields magnetic bearings H02K7/09

Abstract

A waterproof axial flow fan includes: a rotor having a rotating shaft pivotally supported by a bearing in a rotatable manner, an impeller provided to a tip of the rotating shaft and a rotor cover; a stator having a winding and a circuit board, a surface of which is coated with an electrically insulating synthetic resin; and at least one ring collection groove part formed in a resin surface opposing to the rotor cover at an apex of the stator so as to surround a tip of a bearing holding part for holding the bearing.

Claims

1. A waterproof axial flow fan comprising:

a rotor having a rotating shaft pivotally supported by a bearing in a rotatable manner, an impeller provided to a tip of the rotating shaft, and a rotor cover;

a stator having a winding and a circuit board, a surface of which is coated with an electrically insulating synthetic resin; and

a collection groove part recessed from a flat surface of the resin opposing to the rotor cover and at an apex of the stator, the collection groove part having a ring shape so as to surround a tip of a bearing holding part for holding the bearing, the flat surface of the resin being closer to the rotor cover in a direction of an axis of the rotating shaft than other surfaces of the resin,

wherein the collection groove part comprises an inner circle and an outer circle of the ring shape, and the inner circle and the outer circle are located at the flat surface of the resin.

2. The waterproof axial flow fan according to claim 1;

wherein the collection groove part is a plurality of collection groove parts, wherein the plurality of collection groove parts are concentrically formed around the tip of the bearing holding part in the resin surface opposing to the rotor cover at the apex of the stator.

3. The waterproof axial flow fan according to claim 1;

further comprising an exhaust groove part extended from the collection groove part outwardly in a radial direction of the stator.

4. The waterproof axial flow fan according to claim 3;

wherein the exhaust groove part is a plurality of exhaust groove parts, and wherein the plurality of exhaust groove parts are radially extended from the collection groove part outwardly in the radial direction of the stator.

5. The waterproof axial flow fan according to claim 4, wherein the plurality of exhaust groove parts are inclined downwardly and outwardly in the radial direction of the stator.

6. The waterproof axial flow fan according to claim 3;

wherein the exhaust groove part is a plurality of exhaust groove parts, and wherein the plurality of exhaust groove parts are spirally extended from the collection groove part outwardly in the radial direction of the stator.

7. The waterproof axial flow fan according to claim 6;

wherein the plurality of exhaust groove parts are formed so as to bend along a rotating direction of the rotor.

8. The waterproof axial flow fan according to claim 7;

wherein the plurality of exhaust groove parts are inclined downwardly and outwardly in the radial direction of the stator.

9. The waterproof axial flow fan according to claim 6;

wherein the plurality of exhaust groove parts are inclined downwardly and outwardly in the radial direction of the stator.

10. The waterproof axial flow fan according to claim 3;

wherein the exhaust groove part is inclined downwardly and outwardly in the radial direction of the stator.

11. A waterproof axial flow fan comprising:

a rotor having a rotating shaft pivotally supported by a bearing in a rotatable manner, an impeller provided to a tip of the rotating shaft, and a rotor cover;

a stator having a winding and a circuit board, a surface of which is coated with an electrically insulating synthetic resin;

a ring collection groove part formed in a resin surface opposing to the rotor cover at an apex of the stator so as to surround a tip of a bearing holding part for holding the bearing; and

an exhaust groove part extended from the ring collection groove part outwardly in a radial direction of the stator.

12. The waterproof axial flow fan according to claim 11;

wherein the exhaust groove part is a plurality of exhaust groove parts, and wherein the plurality of exhaust groove parts are radially extended from the ring collection groove part outwardly in the radial direction of the stator.

13. The waterproof axial flow fan according to claim 12;

wherein the plurality of exhaust groove parts are inclined downwardly and outwardly in the radial direction of the stator.

14. The waterproof axial flow fan according to claim 11;

wherein the exhaust groove part is a plurality of exhaust groove parts, and wherein the plurality of exhaust groove parts are spirally extended from the ring collection groove part outwardly in the radial direction of the stator.

15. The waterproof axial flow fan according to claim 14;

wherein the plurality of exhaust groove parts are formed so as to bend along a rotating direction of the rotor.

16. The waterproof axial flow fan according to claim 15;

wherein the plurality of exhaust groove parts are inclined downwardly and outwardly in the radial direction of the stator.

17. The waterproof axial flow fan according to claim 14;

wherein the plurality of exhaust groove parts are inclined downwardly and outwardly in the radial direction of the stator.

18. The waterproof axial flow fan according to claim 11;

wherein the exhaust groove part is inclined downwardly and outwardly in the radial direction of the stator.