Hermetically sealed compressor having oil supply mechanism based on refrigerant pressure

• US 7,581,936 B2
• Filed: 03/16/2006
• Issued: 09/01/2009
• Est. Priority Date: 03/17/2005
• Status: Active Grant

• Current Assignee: Sanyo Electric Company Limited (Panasonic Holdings Corporation)
• Original Assignee: Sanyo Electric Company Limited (Panasonic Holdings Corporation)
• Inventors: Nishikawa, Takahiro, Kogure, Yoshihisa, Hashimoto, Akira, Yoshida, Hiroyuki, Hara, Masayuki, Ogasawara, Hirotsugu
• Primary Examiner(s): Trieu; Theresa
• Application Number:
  US11/378,800
• Publication Number:
  US 20060210408A1
• Time in Patent Office: 1,265 Days
• Field of Search: 418/63, 418/55.1, 418/55.6, 418/88, 418/94, 418/99, 418/270, 418/60, 184/6.18
• US Class Current: 418/63
• CPC Class Codes: F04C 18/3564 the surfaces of the inner and outer member, forming the working space, being surfaces of revolution
• CPC Class Codes: F04C 23/001 of similar working principle
• CPC Class Codes: F04C 23/008 Hermetic pumps
• CPC Class Codes: F04C 28/08 characterised by varying the rotational speed
• CPC Class Codes: F04C 29/02 Lubrication of machines or engines in general F01M; Lubricant separation separation in general B01D

Abstract

A hermetically sealed rotary compressor 100 including an electrically-driven element 2, a rotary compressing element 4 equipped with a cylinder 41 having a compression chamber 43 and a hermetically sealed container 1 in which oil 8 is stocked, is equipped with an oil path 62 for injecting the oil 8 into the compression chamber 43 when refrigerant is sucked into the compression chamber 43, and an opening/closing valve 80 for opening/closing the oil path 62 in accordance with the discharge pressure of the rotary compressing element 4 of the pressure of the compressed refrigerant compressed by the rotary compressing element 4.

Claims

1. A hermetically sealed compressor comprising:

an electrically-driven element;

a rotary compressing element driven by the electrically-driven element to compress refrigerant;

the rotary compressing element having a primary bearing, a secondary bearing and at least one cylinder that is sandwiched between the primary and secondary bearings and has a refrigerant inlet through which a refrigerant is adapted to flow under refrigerant suction pressure and a discharge outlet through which compressed refrigerant is adapted to flow under refrigerant discharge pressure and including a compression chamber in which the refrigerant is compressed;

a hermetically sealed container in which the electrically-driven element and the rotary compressing element are accommodated and oil is stocked,

a refrigerant suction path for sucking refrigerant and feeding the sucked refrigerant into the compression chamber;

an oil stock portion for stocking the oil;

an oil path for injecting the oil into the compression chamber when the refrigerant is sucked into the compression chamber of the cylinder constituting the rotary compressing element; and

an opening/closing valve for opening/closing the oil path in accordance with the refrigerant discharge pressure of the rotary compressing element or the pressure of the compressed refrigerant compressed by the rotary compressing element such that oil is supplied into the compression chamber when the refrigerant discharge pressure or the pressure of the compressed refrigerant is low, said valve including biasing means for moving the valve to the open position, wherein the opening/closing valve is disposed inside the cylinder, wherein the oil path includes an oil flowing groove that is formed between the cylinder and one of the primary bearing and the secondary bearing, wherein a part of the oil flowing groove is formed on an outer periphery of the opening/closing valve, and the oil flowing groove intercommunicates with the compression chamber and the oil stock portion, the opening/closing valve is disposed in the oil path, and the oil is adapted to flow from the oil stock portion through the oil flowing groove formed between the cylinder and one of the primary and secondary bearings into the compression chamber interlocking with the opening of the open/closing valve.

2. The hermetically sealed compressor according to claim 1, wherein the opening/closing valve is opened/closed in accordance with differential pressure between the refrigerant suction pressure and the reference discharge pressure of the compression chamber, and set to an open state when the differential pressure is low.

3. The hermetically sealed compressor according to claim 1, wherein the opening/closing valve is opened/closed in accordance with the pressure of the compressed refrigerant, and is set to an open state when the pressure of the compressed refrigerant is low.

4. The hermetically sealed compressor according to claim 3, further comprising a compressed refrigerant introducing path for applying the pressure of the compressed refrigerant discharged from a discharge pipe of the hermetically sealed container to the opening/closing valve.

5. The hermetically sealed compressor according to claim 1, wherein the oil flowing groove is formed at the outside of the opening/closing valve, and the oil is adapted to flow along the outside of the opening/closing valve into the compression element.

6. A hermitically sealed compressor comprising:

an electrically-driven element;

a rotary compressing element driven by the electrically-driven element to compress refrigerant;

the rotary compressing element having a primary bearing, a secondary bearing and at least one cylinder that is sandwiched between the primary and secondary bearings and has a refrigerant inlet through which a refrigerant is adapted to flow under refrigerant suction pressure and a discharge outlet through which compressed refrigerant is adapted to flow under refrigerant discharge pressure and including a compression chamber in which the refrigerant is compressed;

a hermetically sealed container in which the electrically-driven element and the rotary compressing element are accommodated and oil is stocked,

a refrigerant suction path for sucking refrigerant and feeding the sucked refrigerant into the compression chamber;

an oil stock portion for stocking the oil;

an oil path for injecting the oil into the compression chamber when the refrigerant is sucked into the compression chamber of the cylinder constituting the rotary compressing element; and

an opening/closing valve for opening/closing the oil path in accordance with the refrigerant discharge pressure of the rotary compressing element or the pressure of the compressed refrigerant compressed by the rotary compressing element such that oil is supplied into the compression chamber when the refrigerant discharge pressure or the pressure of the compressed refrigerant is low, said valve including biasing means for moving the valve to the open position, wherein the oil path includes an oil flowing groove that is formed between the cylinder and one of the primary bearing and the secondary bearing and intercommunicates with the compression chamber and the oil stock portion, the opening/closing valve is disposed in the oil path, and the oil is adapted to flow from the oil stock portion through the oil flowing groove formed between the cylinder and one of the primary and secondary bearings into the compression chamber interlocking with the opening of the open/closing valve;

wherein the oil flowing groove comprises a first oil path penetrating from the outer peripheral surface to the oil stock portion, a second oil path that penetrates through the primary bearing in the thickness direction of the primary bearing and intercommunicates with the first oil path at one end thereof, a third oil path that is formed in the cylinder so as to intercommunicate with the other end of the second oil path and the compression chamber, and a fourth oil path that is formed around an outer periphery of the opening/closing valve so as to intercommunicate with the third oil path when the refrigerant discharge pressure of the pressure of the compressed refrigerant is low.