Power converting apparatus and capacitor cover thereof

• US 8,787,018 B2
• Filed: 04/11/2012
• Issued: 07/22/2014
• Est. Priority Date: 04/18/2011
• Status: Expired due to Fees

• Current Assignee: Kabushiki Kaisha Yaskawa Denki
• Original Assignee: Kabushiki Kaisha Yaskawa Denki
• Inventors: Nagano, Sumiaki, Kishimoto, Kazutaka, Kojyo, Makoto
• Primary Examiner(s): HOFFBERG, ROBERT JOSEPH
• Application Number:
  US13/443,885
• Publication Number:
  US 20120262877A1
• Time in Patent Office: 832 Days
• Field of Search: 361/679.48, 361/690, 361694-695, 361676-678, 363/141
• US Class Current: 361/690
• CPC Class Codes: H01G 2/10 Housing; Encapsulation
• CPC Class Codes: H01G 4/224 Housing; Encapsulation
• CPC Class Codes: H01G 4/28 Tubular capacitors
• CPC Class Codes: H05K 7/20918 the components being isolated from air flow, e.g. hollow heat sinks, wind tunnels or funnels

Abstract

A power converting apparatus includes a housing, a cylindrical capacitor, and a cylindrical capacitor cover. The housing includes a housing base, a main body, and an air duct. The main body includes a plurality of electronic components on a first surface of the housing base. The air duct is disposed on a second surface of the housing base. The capacitor penetrates through the housing base so that a part of the capacitor is disposed in the main body while a rest part of the capacitor is disposed in the air duct. The capacitor cover is disposed on the housing base and covers the rest part of the capacitor. The capacitor cover includes an elastic material and an inner surface. The capacitor cover includes a groove disposed on the inner surface in an axial direction of the capacitor cover.

Claims

1. A power converting apparatus configured to convert alternating current power into direct current power or convert direct current power into alternating current power, the power converting apparatus comprising:

a housing comprising;

a housing base having a first surface and a second surface;

a main body comprising a plurality of electronic components on the first surface of the housing base; and

an air duct through which cooling air flows on the second surface of the housing base;

a cylindrical capacitor penetrating through the housing base so that a part of the capacitor is disposed in the main body while a rest part of the capacitor is disposed in the air duct; and

a cylindrical capacitor cover on the housing base, the capacitor cover covering the rest part of the capacitor, the capacitor cover comprising;

an elastic material;

a cylindrical capacitor cover body being closed at one end and open at another end;

an inner surface defining an inner diameter approximately equal to an outer diameter of the capacitor such that the inner surface of the capacitor cover is in close contact with an outer surface of the capacitor when the capacitor cover is provided over the rest part of the capacitor;

at least one groove, on the inner surface, extending in an axial direction of the capacitor cover; and

an annular flange directly connected to and extending in a radially outward direction from the another end that is open,

wherein the one end of the capacitor cover that is closed being provided within the air duct, and the annular flange directly abuts and is secured to the first surface of the housing base.

2. The power converting apparatus according to claim 1, wherein the at least one groove of the capacitor cover comprises a plurality of grooves circumferentially spaced on the inner surface of the capacitor cover at equal intervals.

3. The power converting apparatus according to claim 2, wherein the capacitor cover comprises a rubber material.

4. The power converting apparatus according to claim 3, wherein the capacitor cover comprises a silicon rubber material.

5. The power converting apparatus according to claim 2, wherein the at least one groove being disposed on the cover body, and an annular flange integral with the cover body, and wherein the cover body is disposed through the housing base, and the flange is secured to the first surface of the housing base.

6. The power converting apparatus according to claim 5, further comprising an annular securing member clamping the capacitor and securing the capacitor to the housing base, the securing member comprising a plurality of first insertion holes, through which securing screws are inserted, at different positions in a circumferential direction of the securing member,

wherein the flange comprises a plurality of second insertion holes, through which the securing screws are inserted, at different positions respectively corresponding to the positions of the first insertion holes of the securing member, and

wherein the flange is held between the securing member and the housing base with the securing screws secured to the housing base through the respective first insertion holes and the respective second insertion holes.

7. The power converting apparatus according to claim 1, wherein the elastic material of the capacitor cover comprises a rubber material.

8. The power converting apparatus according to claim 7, wherein the rubber material of the capacitor cover comprises a silicone rubber material.

9. The power converting apparatus according to claim 7, wherein the at least one groove being disposed on the cover body, and an annular flange integral with the cover body, and wherein the cover body is disposed through the housing base, and the flange is secured to the first surface of the housing base.

10. The power converting apparatus according to claim 9, further comprising an annular securing member clamping the capacitor and securing the capacitor to the housing base, the securing member comprising a plurality of first insertion holes, through which securing screws are inserted, at different positions in a circumferential direction of the securing member,

wherein the flange comprises a plurality of second insertion holes, through which the securing screws are inserted, at different positions respectively corresponding to the positions of the first insertion holes of the securing member, and

wherein the flange is held between the securing member and the housing base with the securing screws secured to the housing base through the respective first insertion holes and the respective second insertion holes.

11. The power converting apparatus according to claim 1, wherein the at least one groove being disposed on the cover body, and an annular flange integral with the cover body, and wherein the cover body is disposed through the housing base, and the flange is secured to the first surface of the housing base.

12. The power converting apparatus according to claim 11, further comprising an annular securing member clamping the capacitor and securing the capacitor to the housing base, the securing member comprising a plurality of first insertion holes, through which securing screws are inserted, at different positions in a circumferential direction of the securing member,

wherein the flange comprises a plurality of second insertion holes, through which the securing screws are inserted, at different positions respectively corresponding to the positions of the first insertion holes of the securing member, and

wherein the flange is held between the securing member and the housing base with the securing screws secured to the housing base through the respective first insertion holes and the respective second insertion holes.

13. The power converting apparatus according to claim 11, wherein the cover body covers the rest part of the capacitor with a predetermined gap defined between a bottom of the capacitor and the closed end of the cover body in the axial direction of the capacitor cover.

14. The power converting apparatus according to claim 1, wherein the at least one groove defines an open air passage between the capacitor and the capacitor cover, each of the at least one groove having an end that that is open, the open end of the at least one groove located in the main body.

15. A cylindrical capacitor cover of a power converting apparatus, the power converting apparatus being configured to convert alternating current power into direct current power or convert direct current power into alternating current power, the power converting apparatus comprising:

a housing base having a first surface and a second surface;

a main body on the first surface of the housing base, the main body comprising a plurality of electronic components including a cylindrical capacitor penetrating through the housing base; and

an air duct through which cooling air flows on the second surface of the housing base,

wherein a part of the capacitor is disposed in the air duct, wherein the capacitor cover is disposed on the housing base so as to cover the part of the capacitor disposed in the air duct, the capacitor cover comprising;

an elastic material;

a cylindrical cover body that is closed at the one end and open at another end;

an inner surface defining an inner diameter approximately equal to an outer diameter of the capacitor such that the inner surface of the capacitor cover is in close contact with an outer surface of the capacitor when the capacitor cover is provided over the part of the capacitor;

at least one groove, on the inner surface, extending in an axial direction of the capacitor cover; and

an annular flange directly connected to and extending in a radially outward direction from the another end that is open,

wherein the one end of the cover body that is closed being provided within the air duct, and the annular flange directly abuts and is secured to the first surface of the housing base.

16. The cylindrical capacitor cover according to claim 15, wherein the at least one groove defines an open air passage between the capacitor and the capacitor cover, each of the at least one groove having an end that that is open, the open end of the at least one groove located in the main body.