Scroll fluid machine, and method for processing scroll member

Patent metadata

Field	Value
Publication number	US-10968908-B2
Application number	US-201716090951-A
Country	US
Kind code	B2
Filing date	Aug 23, 2017
Priority date	Aug 26, 2016
Publication date	Apr 6, 2021
Grant date	Apr 6, 2021

Abstract

Provided is a scroll fluid machine which is capable of inhibiting contact between tooth tip corners and tooth bottom corners. The present invention is provided with: a wall inclined portion ( 3 b 1 ) of which a facing surface has a distance to an end plate which continuously decreases from the outer circumferential side to the inner circumferential side; and an end plate inclined portion ( 5 a 1 ). Chamfered portions ( 8 a ) are provided to tooth tip corners ( 8 ) of a tooth tip of a wall ( 3 b ) which face tooth bottom corners ( 9 ) of bases of mating walls ( 5 b ). The chamfered portions ( 8 a ) have a shape which avoids contact with step parts ( 9 a ) which are formed at the tooth bottom, and which are adjacent to the tooth bottom corners ( 9 ).

First claim

The invention claimed is:

1. A scroll fluid machine comprising:
a first scroll member in which a spiral first wall is provided on a first end plate; and
a second scroll member in which a spiral second wall is provided on a second end plate disposed to face the first end plate and the spiral second wall meshes with the spiral first wall such that the second scroll member performs a revolution orbiting movement relative to the first scroll member,
wherein a first wall flat portion is provided each on an outermost peripheral portion and an innermost peripheral portion of the spiral first wall, the first wall flat portion having a height which is not changed, and a second end plate flat portion is provided on the second end plate so as to correspond to each of the first wall flat portion,
wherein a first wall inclined portion is provided over a region between the first wall flat portion provided on the outermost peripheral portion and the first wall flat portion provided on the innermost peripheral portion, the spiral first wall inclined portion having a height which continuously decreases from an outer peripheral side toward an inner peripheral side thereof,
wherein a second end plate inclined portion is provided over a region between the second end plate flat portion provided on the outermost peripheral portion and the second end plate flat portion provided on the innermost peripheral portion, the second end plate inclined portion having a tooth bottom surface which faces a tooth tip of the spiral first wall inclined portion and is inclined according to an inclination of the first wall inclined portion, and
wherein in a tooth tip of the spiral first wall, a chamfered portion is provided at a tooth tip corner facing a tooth bottom corner of a base of a meshing wall the second wall meshing with the spiral first wall.

2. The scroll fluid machine according to claim 1 ,
wherein the chamfered portion has a shape which avoids a contact with a step portion formed at the tooth bottom corner adjacent to the base of the second wall.

3. The scroll fluid machine according to claim 2 ,
wherein the chamfered portion is provided at the tooth tip corner of the first wall corresponding to the second end plate inclined portion, and
wherein the chamfered portion is not provided at the tooth tip corner of the first wall flat portion.

4. The scroll fluid machine according to claim 1 ,
wherein the chamfered portion is provided at the tooth tip corner of the first wall corresponding to the second end plate inclined portion, and
wherein the chamfered portion is not provided at the tooth tip corner of the first wall flat portion.

5. The scroll fluid machine according to claim 1 ,
wherein a second wall flat portion is provided each on an outermost peripheral portion and an innermost peripheral portion of the second wall, the second wall flat portion having a height which is not changed, and a first end plate flat portion is provided on the first end plate so as to correspond to each of the second wall flat portion,
wherein a second wall inclined portion is provided over a region between the second wall flat portion provided on the outermost peripheral portion and the second wall flat portion provided on the innermost peripheral portion, the second wall inclined portion having a height which continuously decreases from an outer peripheral side toward an inner peripheral side thereof, and
wherein a first end plate inclined portion is provided over a region between the first end plate flat portion provided on the outermost peripheral portion and the first end plate flat portion provided on the innermost peripheral portion, the first end plate inclined portion having a tooth bottom surface which faces a tooth tip of the second wall inclined portion and is inclined according to an inclination of the second wall inclined portion.

6. A method for processing a scroll member including an end plate, a spiral wall provided on the end plate,
wherein a wall flat portion is provided each on an outermost peripheral portion and an innermost peripheral portion of the spiral wall, the wall flat portion having a height which is not changed, and an end plate flat portion is provided on the end plate so as to correspond to each of the wall flat portion,
wherein a wall inclined portion is provided over a region between the wall flat portion provided on the outermost peripheral portion and the wall flat portion provided on the innermost peripheral portion, the wall inclined portion having a height which continuously decreases from an outer peripheral side toward an inner peripheral side thereof, and
wherein an end plate inclined portion is provided over a region between the end plate flat portion provided on the outermost peripheral portion and the end plate flat portion provided on the innermost peripheral portion, the end plate inclined portion having a tooth bottom surface which faces a tooth tip of the wall inclined portion and is inclined according to an inclination of the wall inclined portion,
the method comprising:
a first peripheral wall surface processing step of processing one peripheral wall surface of the spiral wall and a tooth bottom adjacent the one peripheral wall surface;
a second peripheral wall surface processing step of processing the other peripheral wall surface of the spiral wall and a tooth bottom adjacent to the other peripheral wall surface; and
a tooth bottom processing step of processing only a tooth bottom between the one peripheral wall surface and the other peripheral wall surface.

7. The method for processing a scroll member according to claim 6 , further comprising: a chamfering processing step of forming a chamfered portion at a tooth tip corner of the spiral wall.

Assignees

• Mitsubishi Heavy Ind Thermal Systems Ltd

Inventors

• Sato Hajime
• Kimata Yoshiyuki
• Hamano Masashi
• Ito Takahide

Classifications

• F04C18/0276 Primary

  Different wall heights · CPC title

• F04C18/0284

  Details of the wrap tips · CPC title

• F04C2230/10

  by removing material · CPC title

• F04C18/0215 Primary

  where only one member is moving · CPC title

• F04C27/005

  Axial sealings for working fluid · CPC title