Scroll compressor and refrigeration cycle apparatus

Patent metadata

Field	Value
Publication number	US-10920774-B2
Application number	US-201716071270-A
Country	US
Kind code	B2
Filing date	Mar 8, 2017
Priority date	Mar 31, 2016
Publication date	Feb 16, 2021
Grant date	Feb 16, 2021

Abstract

A scroll compressor includes a crank shaft, an orbiting scroll, and a frame. The crank shaft has a lubricant channel. The orbiting scroll has an inner channel and a lubricant channel groove. The inner channel allows the lubricant supplied through the crank shaft to flow outward. The lubricant channel groove has an annular shape and allows the lubricant supplied through the inner channel to be supplied to the thrust surface. The lubricant channel groove is formed such that the lubricant channel groove stays within a region of the thrust surface while the orbiting scroll is orbiting.

First claim

The invention claimed is:

1. A scroll compressor comprising:
a crank shaft having a lubricant channel allowing lubricant to flow through the lubricant channel;
an orbiting scroll attached to the crank shaft and including a base plate that is discoidal; and
a frame having a thrust surface against which the orbiting scroll slides, wherein
the thrust surface has an annular shape and facing an outer circumferential region of one surface of the base plate of the orbiting scroll,
the orbiting scroll has
an inner channel allowing the lubricant supplied through the crank shaft to flow outward and
a lubricant channel groove, which has an annular shape in the outer circumferential region of the one surface of the base plate facing the thrust surface and which allows the lubricant supplied through the inner channel to be supplied to the thrust surface,

the lubricant channel groove is formed such that the lubricant channel groove stays within a region of the thrust surface while the orbiting scroll is orbiting,
the orbiting scroll has an orbit-scroll Oldham groove accommodating a part of an Oldham ring,
the orbit-scroll Oldham groove is formed in the one surface of the base plate, and
the lubricant channel groove is connected to the inner channel at one end and connected to the orbit-scroll Oldham groove at another end.

2. The scroll compressor of claim 1 ,
wherein the orbiting scroll has a cylindrical part projecting from the one surface of the base plate, and
wherein the inner channel is connected to an inside of the cylindrical part at one end and connected to the lubricant channel groove at another end.

3. The scroll compressor of claim 2 , wherein the cylindrical part of the orbiting scroll has a projection projecting from an end part of the cylindrical part close to the base plate toward a center of the cylindrical part.

4. The scroll compressor of claim 2 , further comprising a bushing connecting the orbiting scroll and the crank shaft to each other, wherein the bushing includes a weight part provided at a portion of the bushing further to an outside than is the cylindrical part.

5. The scroll compressor of claim 4 , wherein the frame has a lubricant discharge hole at a wall part of the frame facing the bushing.

6. The scroll compressor of claim 4 ,
wherein the bushing has a flat surface facing an inner wall surface of the cylindrical part of the orbiting scroll, and
wherein, when a sectional area of a lubricant flowing space defined by the flat surface and the inner wall surface of the cylindrical part is S 1 and a sectional area of the inner channel is S 2 , a relationship of S 1 >S 2 is satisfied.

7. The scroll compressor of claim 6 , wherein, when an amount of the lubricant flowing through the lubricant flowing space is M1 and an amount of the lubricant flowing through the inner channel is M2, a relationship of M1>M2 is satisfied.

8. The scroll compressor of claim 7 , wherein a relationship of 0.05<M2/(M1+M2)<0.3 is satisfied.

9. The scroll compressor of claim 1 ,
wherein the inner channel is formed along the one surface of the base plate, and
wherein the inner channel has a connection hole connected to the lubricant channel groove.

10. The scroll compressor of claim 9 , wherein the connection hole is inclined from the inner channel outward to be connected to the lubricant channel groove.

11. The scroll compressor of claim 9 ,
wherein the inner channel penetrates an outer end surface of the base plate, and a plug part is inserted into an outer end portion of the inner channel, and
wherein, when a length by which the plug part is inserted from the outer end surface of the base plate is D 1 and a minimum distance between the outer end surface of the base plate and the connection hole is D 2 , a relationship of D 1 >D 2 is satisfied.

12. The scroll compressor of claim 11 ,
wherein the inner channel includes a first inner channel and a second inner channel provided opposite to the first inner channel across an axis of the crank shaft, and
wherein the plug part is provided in the first inner channel, and an adjustment part adjusting a flow amount of the lubricant and allowing the lubricant to be discharged from a side surface of the base plate is provided in the second inner channel.

13. A refrigeration cycle apparatus including the scroll compressor of claim 12 , wherein refrigerant containing HFO-1234yf is used in the refrigeration cycle apparatus.

14. The scroll compressor of claim 1 , wherein the orbiting scroll has a first sliding surface provided at a portion further to an inside than is the lubricant channel groove and a second sliding surface provided at a portion further to an outside than is the lubricant channel groove and having a smaller width than a width of the first sliding surface.

15. The scroll compressor of claim 1 ,
wherein the frame further has a frame Oldham groove accommodating a part of the Oldham ring and a thrust plate provided on the thrust surface,
wherein a part of the frame Oldham groove is formed in the thrust surface,
wherein the orbiting scroll slides against the thrust plate, and
wherein the thrust plate covers at least a part of the frame Oldham groove.

16. A refrigeration cycle apparatus including the scroll compressor of claim 1 , wherein refrigerant containing R32 is used in the refrigeration cycle apparatus.

Assignees

• Mitsubishi Electric Corp

Inventors

• Matsui Tomokazu
• Tatsuwaki Kohei
• Takamura Yuji
• Morita Shinya

Classifications

• F04C18/02

  of arcuate-engagement type, i.e. with circular translatory movement of co-operating members, each member having the same number of teeth or tooth-equivalents · CPC title

• F04C18/0215 Primary

  where only one member is moving · CPC title

• F04C27/005

  Axial sealings for working fluid · CPC title

• F04C29/0057

  for eccentric movement · CPC title

• F04C29/023

  Lubricant distribution through a hollow driving shaft (F04C29/025 takes precedence) · CPC title