Scroll fluid machine and tip seal

Patent metadata

Field	Value
Publication number	US-11015601-B2
Application number	US-201716311087-A
Country	US
Kind code	B2
Filing date	Aug 25, 2017
Priority date	Aug 31, 2016
Publication date	May 25, 2021
Grant date	May 25, 2021

Abstract

The present invention improves performance of a scroll fluid machine by effectively exhibiting a function of a tip seal installed at a tooth tip of a wall body even when a continuous slope is provided to the wall body. A slope in which the distance between opposing surfaces of opposing end plates continuously reduces from the outer peripheral surface toward the inner peripheral surface is provided, and a tip seal (7) that comes into contact with an opposing tooth bottom so as to seal a fluid is provided to a tip seal groove (3d) formed at a tooth tip of a wall body (3b) corresponding to the slope. A groove bottom (3d1) of the tip seal groove (3d) is formed into a shape in which the center portion (3d2) in the groove width direction deepest. The tip seal (7) is formed such that the center portion (7a1), in the width direction, of the bottom (7a) of the tip seal (7) facing the groove bottom (3d1) projects farther than both side portions (7a2).

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;
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 second wall meshes with the first wall such that the second scroll member performs a revolution orbiting movement relative to the first scroll member; and
an inclined portion in which an inter-facing surface distance between the first end plate and the second end plate facing each other continuously decreases from outer peripheral sides of the first wall and the second wall toward inner peripheral sides thereof,
wherein a groove portion formed on a tooth tip of each of the first wall and the second wall corresponding to the inclined portion is provided with a tip seal which comes into contact with a facing tooth bottom so as to seal a fluid,
wherein a horizontal cross section of the groove portion in a direction orthogonal to a spiral direction of the first wall and the second wall is rectangular in shape and a groove bottom of the groove portion has an arc shape in which a center portion in a groove width direction is deepest, and
wherein a horizontal cross section of the tip seal in the direction orthogonal to the spiral direction of the first wall and the second wall is rectangular in shape and a center portion of the tip seal in a width direction of a tip seal bottom portion facing the groove bottom protrudes from both side portions of the tip seal in an arc shape.

2. The scroll fluid machine according to claim 1 ,
wherein in a case where an inclination in a spiral direction of the inclined portion is defined as φ and a groove width of the groove portion is defined as Tg,
a protrusion amount Δh of the center portion of the tip seal with respect to both side portions of the tip seal is (Tg/2)×tan φ.

3. The scroll fluid machine according to claim 2 ,
wherein a wall flat portion whose height is not changed is provided in an outermost peripheral portion and/or an innermost peripheral portion of each of the first wall and the second wall,
wherein an end plate flat portion corresponding to the wall flat portion is provided in each of the first end plate and the second end plate,
wherein the groove bottom of the groove portion corresponding to the end plate flat portion is a flat surface, and
wherein in the tip seal corresponding to the end plate flat portion, the tip seal bottom portion is a flat surface.

4. The scroll fluid machine according to claim 2 ,
wherein the tip seal is divided at a predetermined position in the spiral direction.

5. The scroll fluid machine according to claim 1 ,
wherein a wall flat portion whose height is not changed is provided in an outermost peripheral portion and/or an innermost peripheral portion of each of the first wall and the second wall,
wherein an end plate flat portion corresponding to the wall flat portion is provided in each of the first end plate and the second end plate,
wherein the groove bottom of the groove portion corresponding to the end plate flat portion is a flat surface, and
wherein in the tip seal corresponding to the end plate flat portion, the tip seal bottom portion is a flat surface.

6. The scroll fluid machine according to claim 5 ,
wherein the tip seal is divided at a predetermined position in the spiral direction.

7. The scroll fluid machine according to claim 1 ,
wherein the tip seal is divided at a predetermined position in the spiral direction.

8. A tip seal which is installed in a groove portion formed on a tooth tip of a spiral wall of a scroll fluid machine,
wherein the wall includes an inclined portion whose height is continuously changed in a spiral direction,
wherein a horizontal cross section of the groove portion in a direction orthogonal to a spiral direction of the first wall and the second wall is rectangular in shape and a groove bottom of the groove portion has an arc shape in which a center portion in a width direction is deepest,
wherein a horizontal cross section of the tip seal in the direction orthogonal to the spiral direction of the first wall and the second wall is rectangular in shape, and
wherein in a bottom portion of the tip seal facing the groove bottom, a center portion in a groove width direction protrudes from both side portions in an arc shape.

9. The tip seal which is installed in the groove portion formed on the tooth tip of the spiral wall of the scroll fluid machine, according to claim 8 ,
wherein the tip seal is divided at a predetermined position in the spiral direction.

Assignees

• Mitsubishi Heavy Ind Thermal Systems Ltd

Inventors

• Sato Hajime
• Kimata Yoshiyuki
• Hotta Yohei

Classifications

• F04C27/00

  Sealing arrangements in rotary-piston pumps specially adapted for elastic fluids · CPC title

• F04C18/0215 Primary

  where only one member is moving · CPC title

• F04C18/0269

  Details concerning the involute wraps · CPC title

• F04C18/0284 Primary

  Details of the wrap tips · CPC title

• F01C1/0215

  where only one member is moving · CPC title