Two-stage rotary compressor

Patent metadata

Field	Value
Publication number	US-10883501-B2
Application number	US-201816019891-A
Country	US
Kind code	B2
Filing date	Jun 27, 2018
Priority date	Jun 27, 2017
Publication date	Jan 5, 2021
Grant date	Jan 5, 2021

Abstract

The present disclosure relates to a two-stage rotary compressor in which refrigerant inhaled into a compression space of a cylinder is compressed sequentially in two axially connected compression chambers and then is discharged. A rotary compressor according to an embodiment of the present disclosure includes a first compression unit and a second compression unit arranged on and along a single rotation shaft. Middle-pressure refrigerant discharged from the first compression unit flows into the second compression unit. A maximum gas force of the first compression unit and a maximum gas force of the second compression unit counteract with each other, thereby reducing a reaction force acting on a rotation shaft. According to the present disclosure, a single rotary compressor is configured to separately achieve the stroke volume increase and the compression period increase.

First claim

What is claimed is:

1. A rotary compressor, comprising:
a motor;
a rotation shaft coupled to the motor;
a first compression unit, comprising:
a first cylinder attached to the rotation shaft, the first cylinder including a first refrigerant receiving space defined therein;
a first roller rotatingly disposed in the first refrigerant receiving space to rotate integrally with the rotation shaft; and
a first plurality of vanes inserted into the first roller in a retractable or extendable manner, wherein rotation of the first roller allows the first vanes to extend out of the first roller to contact an inner circumferential face of the first cylinder to divide a first compression space into a first suction chamber and a first compression chamber; and

a second compression unit, comprising:
a second cylinder attached to the rotation shaft, the second cylinder has a second refrigerant receiving space defined therein;
a second roller rotatingly disposed in the second refrigerant receiving space to rotate integrally with the rotation shaft; and
a second plurality of vanes inserted into the second roller in a retractable or extendable manner, wherein rotation of the second roller allows the second vanes to extend out of the roller to contact an inner circumferential face of the second cylinder to divide a second compression space into a second suction chamber and a second compression chamber,
wherein refrigerant compressed in and discharged out of the first compression unit applies a back pressure to the second vanes of the second compression unit to extend out of the second roller of the second compression unit.

2. The compressor of claim 1 , wherein a suction position of the first compression unit and a suction position of the second compression unit have a phase difference of 150 to 210 degrees.

3. The compressor of claim 1 , wherein a number of the first vanes is larger than a number of the second vanes.

4. The compressor of claim 1 , wherein either the first roller or the second roller is integrally formed with the rotation shaft.

5. A rotary compressor comprising:
a motor;
a rotation shaft coupled to the motor;
a first compression unit comprising:
a first cylinder attached to the rotation shaft, the first cylinder including a first refrigerant receiving space defined therein;
a first roller rotatingly disposed in the first refrigerant receiving space to rotate integrally with the rotation shaft; and
a plurality of first vanes inserted into the first roller in a retractable or extendable manner, wherein rotation of the first roller allows the first vanes to extend out of the first roller to contact an inner circumferential face of the first cylinder to divide a first compression space into a first suction chamber and a first compression chamber, wherein a number of the first vanes is N+2 and

a second compression unit comprising:
a second cylinder attached to the rotation shaft, the second cylinder including a second refrigerant receiving space defined therein;
a second roller rotatingly disposed in the second refrigerant receiving space to rotate integrally with the rotation shaft; and
a plurality of second vanes inserted into the second roller in a retractable or extendable manner, wherein rotation of the second roller allows the second vanes to extend out of the second roller to contact an inner circumferential face of the second cylinder to divide a second compression space into a second suction chamber and a second compression chamber, wherein a number of the second vanes is N+1,
wherein N in the N+1 and N+2 is a same natural number, and
wherein refrigerant compressed in and discharged out of the first compression unit applies a back pressure to the second vanes of the second compression unit to extend out of the second roller of the second compression unit.

6. The compressor of claim 5 , comprising an intermediate spacer separating the first compression unit from the second compression unit,
the intermediate spacer including a middle-pressure refrigerant channel defined therein for communicatively coupling refrigerant compressed in and discharged out of the first compression unit with a suction port of the second compression unit.

7. The compressor of claim 6 , wherein the intermediate spacer further includes a back-pressure refrigerant channel defined therein for communicatively coupling the refrigerant compressed in and discharged out of the first compression unit with slots defined in the second compression unit.

8. The compressor of claim 7 , wherein one end of the back-pressure refrigerant channel is fluidly connected to the middle-pressure refrigerant channel.

9. The compressor of claim 7 , wherein the second vanes are slidably disposed in the slots defined in the second compression unit.

10. The compressor of claim 5 , wherein either the first roller or the second roller is integrally machined with the rotation shaft.

11. The compressor of claim 5 , further including:
a main bearing; and
an auxiliary bearing, the first cylinder and the second cylinder being disposed between the main bearing and the auxiliary bearing.

12. The compressor of claim 5 , further including an intermediate spacer disposed between the first cylinder and the second cylinder.

Assignees

• Lg Electronics Inc

Inventors

• Moon Seokhwan
• Noh Kiyoul
• Shin Jinung

Classifications

• F04C29/0042

  Driving elements, brakes, couplings, transmissions specially adapted for pumps (brakes, couplings, transmissions per se F16, B60) · CPC title

• F04C28/22

  by changing the eccentricity between cooperating members · CPC title

• F04C18/344 Primary

  with vanes reciprocating with respect to the inner member · CPC title

• F25B1/04

  with compressor of rotary type ({F25B1/005,} F25B1/10 take precedence) · CPC title

• F01C21/108

  with an axial surface, e.g. side plates · CPC title