Refrigerant pump and cooling device employing same

• US 20040253127A1
• Filed: 03/31/2004
• Published: 12/16/2004
• Est. Priority Date: 06/10/2003
• Status: Abandoned Application

• Current Assignee: Matsushita Electric Industrial Company Limited (Panasonic Holdings Corporation)
• Original Assignee: Matsushita Electric Industrial Company Limited (Panasonic Holdings Corporation)
• Inventors: Nakano, Masao, Ikeda, Akira, Ashitani, Hiromasa
• Application Number:
  US10/814,712
• Publication Number:
  US 20040253127A1
• Time in Patent Office: Days
• US Class Current: 417/423.7
• CPC Class Codes: F04B 17/03 driven by electric motors
• CPC Class Codes: F04C 29/0085 Prime movers

Abstract

A refrigerant pump employed in a semiconductor cooling device includes a sealed casing, an electric motor having a stator disposed outside the sealed casing and a rotor disposed within the sealed casing, a pump mechanism juxtaposed with the electric motor, and a drive shaft for transmitting a rotational force of the rotor to the pump mechanism. The stator is positioned closer to the pump mechanism than the rotor is.

Claims

1. A refrigerant pump comprising:

a sealed casing;

an electric motor having a stator disposed outside the sealed casing and a rotor disposed within the sealed casing;

a pump mechanism juxtaposed with the electric motor; and

a drive shaft for transmitting a rotational force of the rotor to the pump mechanism,

wherein the stator is positioned closer to the pump mechanism than the rotor is.

2. The refrigerant pump according to claim 1, wherein the drive shaft has a large-diameter portion having first and second end surfaces opposite to each other, the first end surface positioned remote from the electric motor having a higher precision than the second end surface.

3. The refrigerant pump according to claim 2, wherein a surface of the drive shaft is carburized or nitrided.

5. A refrigerant-circulating cooling device comprising a refrigerant pump according to any one of claims 1 to 4, wherein the refrigerant pump is free from oil.

4. A refrigerant pump comprising:

a sealed casing;

an electric motor having a stator disposed outside the sealed casing and a rotor disposed within the sealed casing;

a pump mechanism juxtaposed with the electric motor;

a drive shaft for transmitting a rotational force of the rotor to the pump mechanism; and

a bearing for rotatably supporting the drive shaft,

wherein at least one of the drive shaft ant the bearing has a carburized or nitrided surface.