Scroll compressor

Patent metadata

Field	Value
Publication number	US-10066623-B2
Application number	US-201414766628-A
Country	US
Kind code	B2
Filing date	Feb 11, 2014
Priority date	Feb 15, 2013
Publication date	Sep 4, 2018
Grant date	Sep 4, 2018

Abstract

Scroll compressor with a stationary, stator scroll and a movable rotor scroll and a drive to move the rotor, whereby in each position places are formed with an instantaneous minimum opening between the rotor scroll and the stator scroll whereby at each height in a minimum opening there is a local transverse internal clearance (S), whereby at least one of the stator flanks or rotor flanks comprises an adapted flank section with an initial local stator flank deviation (ΔT 0 i, AT 0 u) or rotor flank deviation (ΔR 0 i/AR 0 u) that is different to zero at each point when the rotor is stationary, and during nominal operation of the scroll compressor corresponding instantaneous final local stator flank deviations (ΔT f i, ΔT f u) or rotor flank deviations (ΔR f i, ΔR f U) whose absolute values are smaller.

First claim

The invention claimed is:

1. A scroll compressor comprising a stationary stator scroll and a movable rotor scroll, each with a central axis,
whereby said stator scroll and said rotor scroll are formed by a strip that is wound spirally along a length and which is affixed upright with a certain height on a stator plate or a rotor plate respectively,
whereby each strip has two flanks, whereby intersecting lines of the flanks with the stator plate or the rotor plate concerned form spiral base edges, whereby a geometric location of points through which a perpendicular line on the stator plate intersects in an aforementioned spiral base edge determine ideal spiral flanks, whereby a radial distance between a point on the flank of the rotor scroll or the stator scroll and a closest ideal spiral flank defines a local flank deviation, respectively, a local stator flank deviation or a local rotor flank deviation,
whereby the scroll compressor comprises a drive to move a rotor whereby a central axis of the rotor circles eccentrically around the central axis of the stator scroll without the rotor hereby undergoing a rotation around its central axis,
whereby in each position of the rotor in a stator during this circling and eccentric movement of the rotor, places are formed to have either a maximum opening or a minimum opening between the rotor scroll and the stator scroll, whereby the places that have the maximum or the minimum opening are located in a facing plane; the facing plane comprises both aforementioned central axes,
whereby in the places with the minimum opening at each local height with respect to the stator plate, the rotor flank and the stator flank concerned are located at a certain radial distance from one another, wherein the radial distances form local transverse internal clearances,
whereby during a transition from an initial stationary state of the rotor to a final state in nominal service, pressures and temperatures in the scroll compressor change resulting in a deformation of the stator scroll and the rotor scroll and a change of the local stator flank deviations and the local rotor flank deviations, as well as the local transverse internal clearances,
wherein at least one of the stator flanks or the rotor flanks comprises an adapted flank section whose form is initially adapted by having a local initial rotor flank deviation or a local initial stator deviation that is different to zero at each point of the adapted flank section concerned in the initial stationary state of the scroll compressor, whereby upon the transition of the scroll compressor from the initial stationary state to the final state in nominal service, the stator scroll and the rotor scroll deform such that during the movement of the rotor in nominal service there is an instantaneous final local stator flank deviation or an instantaneous final local rotor flank deviation at each point of the aforementioned adapted flank section concerned and in each position of the rotor, whose absolute value is less than the corresponding local initial stator flank deviation or the local initial rotor flank deviation at the same point when the rotor is stationary.

2. Scroll compressor according to claim 1 , wherein at least one of the stator flanks or rotor flanks in its entirety forms an aforementioned adapted flank section.

3. Scroll compressor according to claim 1 , wherein more than one of the stator flanks or rotor flanks in its entirety forms an aforementioned adapted flank section.

4. Scroll compressor according to claim 1 , wherein the stator scroll and the rotor scroll are each provided with an aforementioned adapted flank section.

5. Scroll compressor according to claim 4 , wherein the stator scroll and the rotor scroll have an inward stator flank or an inward rotor flank respectively that is turned towards the centre of the scroll compressor and an outward stator flank or an outward rotor flank respectively that is turned away from the centre of the scroll compressor and whereby the outward stator flank and the outward rotor flank are provided with the aforementioned adapted flank sections.

6. Scroll compressor according to claim 1 , wherein for at least some of the positions occupied by the rotor during its movement, the local transverse internal clearances over the height of the stator flank concerned and rotor flank are constant during nominal service, so that these local transverse internal clearances over the height have a variation equal to zero in the positions concerned.

7. Scroll compressor according to claim 6 , wherein for all positions occupied by the rotor during its movement, the local transverse internal clearances over the height of the stator flank and rotor flank concerned are constant during nominal service, so that the local transverse internal clearances over the height have a variation equal to zero in all positions occupied by the rotor.

8. Scroll compressor according to claim 1 , wherein the stator scroll is profiled such that when the scroll compressor is stationary, an aforementioned adapted flank section of a stator flank presents a certain setback from the stator base formed by the edge of the stator strip at the stator plate up to the stator tip formed by a free edge of the stator strip or whereby this adapted flank section of the stator flank presents a certain inclination with respect to the stator plate, while an opposite flank section at the other flank of the stator scroll is made flat when stationary and is in a perpendicular position on the stator plate, so that the stator scroll has a thickness that is greater at the stator base than at the stator tip.

9. Scroll compressor according to claim 1 , wherein the rotor scroll is profiled such that when the scroll compressor is stationary, an aforementioned adapted flank section of a rotor flank presents a certain setback from the rotor base formed by the edge of the rotor strip at the rotor plate up to the rotor tip formed by a free edge of the rotor strip, or whereby this adapted flank section of the rotor flank presents a certain inclination with respect to the rotor plate, while an opposite flank section at the other flank of the rotor scroll when stationary is made flat and is in a perpendicular position on the rotor plate, so that the rotor scroll has a thickness that is greater at the rotor base than at the rotor tip.

10. Scroll compressor according to claim 8 , wherein the stator scroll and the rotor scroll have an inward stator flank or an inward rotor flank respectively that is turned towards the centre of the scroll compressor and an outward stator flank or an outward rotor flank respectively that is turned away from the centre of the scroll compressor, whereby the aforementioned adapted flank section of the stator flank with a setback or inclination forms part of the outward stator flank, and the aforementioned adapted section of the rotor flank with setback or inclination forms part of the outward rotor flank.

11. Scroll compressor according to claim 1 , wherein the rotor scroll or the stator scroll is constructed with rotor flanks or stator flanks respectively that are both, when the scroll compressor is stationary, perpendicular on the rotor plate or the stator plate respectively.

12. Scroll compressor according to claim 1 , wherein the rotor scroll or the stator scroll is constructed with rotor flanks or stator flanks respectively that, when the scroll compressor is stationary, both present a certain setback or inclination with respect to the rotor plate or the stator plate respectively, whereby the flanks concerned in their entirety form the aforementioned adapted flank sections.

13. Scroll compressor accord

Assignees

• Atlas Copco Airpower Nv
• Atlas Capco Airpower Naamloze Vennotschap

Inventors

• STOOP Koen
• Moens Benjamin

Classifications

• F04C2270/17

  Tolerance; Play; Gap · CPC title

• F04C18/0269 Primary

  Details concerning the involute wraps · CPC title

• F04C2250/20

  of the rotor · CPC title

• F04C18/0215

  where only one member is moving · CPC title

• F04C18/0246

  Details concerning the involute wraps or their base, e.g. geometry · CPC title