| US 7,563,085 B2 | ||
| Multicylinder rotary compressor and compressing system and refrigerating unit provided with same | ||
| Masazumi Sakaniwa, Gunma (Japan); Akira Hashimoto, Gunma (Japan); Masayuki Hara, Gunma (Japan); Takahiro Nishikawa, Gunma (Japan); Hirotsugu Ogasawara, Gunma (Japan); and Akihiro Suda, Gunma (Japan) | ||
| Assigned to Sanyo Electric Co., Ltd., Osaka (Japan) | ||
| Filed on Mar. 14, 2005, as Appl. No. 11/79,929. | ||
| Claims priority of application No. 2004-073229 (JP), filed on Mar. 15, 2004; and application No. 2004-191210 (JP), filed on Jun. 29, 2004. | ||
| Prior Publication US 2005/0214137 A1, Sep. 29, 2005 | ||
| Int. Cl. F03C 2/00 (2006.01) | ||
| U.S. Cl. 418—60 [418/23; 418/24; 418/11] | 4 Claims |
| 1. A multicylinder rotary compressor comprising:
a closed vessel;
a refrigerant discharge pipe having a first end inside of the closed vessel;
first and second rotary compressing elements provided in said closed vessel;
said first rotary compressing element including a first cylinder with a first roller configured to rotate in said first cylinder
and a first vane accommodated by a first guide groove formed in said first cylinder to compress a refrigerant gas, said first
vane being biased against said first roller by a first spring member;
said second rotary compressing element including a second cylinder with a second roller configured to rotate in said second
cylinder and a second vane accommodated by a second guide groove formed in said second cylinder to compress a refrigerant
gas;
wherein the second rotary compressing element is not provided with a spring member that biases the second vane against said
second roller;wherein each of the first and second rotary compressing elements has a suction side input and a pressure side output;
a back pressure pipeline having a first end communicating with a back pressure chamber formed on a back surface side of the
second vane;
a motor coupled to said first and second rotary compressing elements, said motor configured to rotate said first and second
rotary compressing elements;
an accumulator tank
a first refrigerant pipeline having a first end inserted into an upper portion of the accumulator tank;
a first refrigerant introduction pipe having a first end communicating with the suction side input of the first rotary compressing
element and a second end opened in the accumulator tank;
a second refrigerant introduction pipe having a first end communicating with the suction side input of the second rotary compressing
element and a second end opened in the accumulator tank;
a second refrigerant pipeline having a first end coupled to a midway portion of the first refrigerant pipeline and a second
end coupled to the back pressure pipeline through a first valve;
a third refrigerant pipeline having a first end coupled to a midway portion of the refrigerant discharge pipe and second end
coupled to the back pressure pipe through a second valve; and
a controller coupled to the motor and configured to control a rotating speed of said motor and said first and second rollers,
said controller also configured to operate said first and second valves,
wherein said controller is configured to operate in a first mode of operation and open the first valve unit and close the
second valve unit to cause the second refrigerant pipeline to communicate with the back pressure pipeline such that a part
of the suction side refrigerants of the first and second rotary compressing elements, which flow in the first refrigerant
pipeline and flow into the accumulator tank, enter the second refrigerant pipeline and flow into the back pressure chamber
formed on the back surface side of the second vane through the back pressure pipeline, whereby suction side pressures of both
of the first and second rotary compressing elements are applied as the back pressure of the second vane, and
wherein said controller is configured to operate in a second mode of operation and close the first valve unit and open the
second valve unit to cause the refrigerant discharge pipe and the back pressure pipeline to communicate with each other and
a part of the discharge side refrigerants of the first and second rotary compressing elements, which are discharged from the
closed vessel and pass through the refrigerant discharge pipe, pass through the third refrigerant pipeline and flow into the
back pressure chamber through the back pressure pipeline and the discharge side pressures of the first and second rotary compressing
elements are applied as the back pressure of the second vane.
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