MOTOR FAN

• US 20150369257A1
• Filed: 10/09/2013
• Published: 12/24/2015
• Est. Priority Date: 03/21/2013
• Status: Abandoned Application

• Current Assignee: Mitsubishi Heavy Industries Thermal Systems, Ltd. (Mitsubishi Heavy Industries, Ltd.)
• Original Assignee: Mitsubishi Heavy Industries Automotive Thermal Systems Co., Ltd.
• Inventors: FUJII, Yasuhiro, SUZUKI, Atsushi, KYUNO, Hiroaki, SAITO, Katsuhiro, WATANABE, Yoshinori
• Application Number:
  US14/759,964
• Publication Number:
  US 20150369257A1
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: F04D 19/002 Axial flow fans
• CPC Class Codes: F04D 25/06 the pump being electrically driven F04D25/08 takes precedence
• CPC Class Codes: F04D 25/068 Mechanical details of the pump control unit pump control details F04D27/00
• CPC Class Codes: F04D 27/004 by varying driving speed
• CPC Class Codes: F04D 29/325 for axial flow fans blade mountings F04D29/34, blades F04D29/38
• CPC Class Codes: F04D 29/522 especially adapted for elastic fluid pumps
• CPC Class Codes: F04D 29/5813 Cooling the control unit
• CPC Class Codes: F04D 29/582 specially adapted for elastic fluid pumps
• CPC Class Codes: H05K 7/20172 Fan mounting or fan specifications

Abstract

A motor fan 1 of the present invention includes: an impeller 7b that forms an air flow; an electric motor 6 that rotationally drives the impeller 7b; a shroud 10 including a cylindrical casing 16 that covers an outer periphery of the impeller 7b, and through which the air flow passes, and a base 11 that projects from a periphery of the casing 16; a control unit 40 that controls rotation of the electric motor 6 and is arranged on a discharge side of the base 11; and a heat sink 50 that dissipates heat from heat dissipation pins 52 to suppress heat generation of the control unit 40, wherein the heat dissipation pins 52 are exposed on a suction side in the heat sink 50.

Claims

1. A motor fan comprising:

an impeller that forms a first air flow from a suction side toward a discharge side that is a back side of the suction side;

an electric motor that rotationally drives the impeller;

a shroud including

a cylindrical casing that covers an outer periphery of the impeller, and through which the air flow passes, and

a base that projects from a periphery of the casing; and

a controller that is arranged on the discharge side of the base, controls rotation of the electric motor, and includes a heat generating element;

a heat dissipater that includes;

a flat plate-like sink body;

a plurality of heat dissipation pins provided on a first surface side of the sink body; and

a heat transfer projection provided on a second surface side of the sink body;

wherein a heat dissipater that is at least partially exposed on the suction side, and is thermally coupled to the heat generating element suppresses a temperature rise of the heat generating element.

2. The motor fan according to claim 1,

wherein the heat dissipater is exposed on the suction side via a through window that is formed in the base corresponding to the controller.

3. The motor fan according to claim 1,

wherein the heat dissipater is arranged only on the suction side of the base, and

is thermally connected to the heat generating element of the controller via a heat transfer body that penetrates the base.

4. The motor fan according to claim 1,

wherein the heat dissipater is formed integrally with the shroud.

5. The motor fan according to claim 1,

wherein the shroud includes a heat dissipater accommodation chamber that is retracted toward the discharge side with respect to the base, and

the heat dissipater is accommodated within the heat dissipater accommodation chamber.

6. The motor fan according to claim 1,

wherein the heat generating element is a switching device.

7. The motor fan according to claim 1,

wherein the heat dissipater includes a plurality of heat dissipation pins.

9. The motor fan according to claim 1,

wherein the heat dissipater is integrally formed by casting aluminum alloy.

8. (canceled)