Rotary compressor drive line

Patent metadata

Field	Value
Publication number	US-2024344517-A1
Application number	US-202218291541-A
Country	US
Kind code	A1
Filing date	Jul 20, 2022
Priority date	Aug 12, 2021
Publication date	Oct 17, 2024
Grant date	—

Abstract

A drive train, specifically to a direct coupling of a drive shaft to a driven shaft provided in the drive train of a rotary compressor. Additionally, an integration of a lubricant circuit, including all associated channels and components, in the drive train.

First claim

1 - 19 . (canceled)

20 . A coupling for a drive train of an oil-free rotary compressor, configured to directly couple a driven shaft configured to drive a compression element, movably arranged in an oilfree compression chamber, and a drive shaft driven by a driving element such as a motor, the coupling comprising:
a coupling hub arranged over a driven end of the driven shaft, a coupling disc attached and/or integrated to a driving end of the drive shaft; wherein the drive shaft comprises a hollow passage over an entire length, and the coupling comprises an elongated stud arranged in the hollow passage of the drive shaft, the stud being coupled to the driven end of the driven shaft and configured to clamp the coupling disc to the coupling hub, wherein the coupling further comprises a tensioning element, mounted on the stud, which is configured to hold the stud against a non-driving end of the drive shaft to apply a clamping force to the coupling ( 3 ).

21 . The coupling according to claim 20 , wherein the stud comprises an externally threaded end over which the complementary internally threaded tensioning element that is able to be tightened to secure the stud against the non-driving end of the drive shaft.

22 . The coupling according to claim 20 , wherein the coupling comprises a friction disk arranged between a surface of the coupling hub and an abutting surface of the coupling disc, which is configured to increase the coefficient of friction between the abutting surfaces.

23 . The coupling according to claim 20 , wherein a surface of the coupling hub and an abutting surface of the coupling disk contain a plurality of mating radial grooves.

24 . The coupling according to claim 23 , wherein the mating radial grooves are of a Hirth type with a profile angle between 45° to 75°.

25 . The coupling according to claim 20 , wherein the coupling comprises a conical clamping ring arranged between the driven end of the driven shaft and the coupling hub, which is configured to clamp the driven shaft to the coupling hub; preferably comprises a plurality of sequentially arranged conical clamping rings.

26 . The coupling according to claim 20 , wherein the coupling comprises a fastening part, which is arranged between the driven end of the driven shaft and the stud, which has a larger diameter than the stud and is configured to couple the stud to the driven shaft.

27 . The coupling according to claim 26 , wherein the stud comprises an externally threaded end and the fastening part comprises a complementary internally threaded opening through which the stud is able to be screwed in; preferably wherein the fastening part comprises a bolt with a bolt head provided with an opening.

28 . The coupling according to claim 20 , wherein the coupling comprises a fastening element arranged between the driving end of the drive shaft and the coupling disc, which is configured to clamp the drive shaft to the coupling disc; preferably wherein the fastening element comprises a bolt screwed into the driving end of the drive shaft.

29 . The coupling according to claim 20 , wherein the coupling hub comprises a bevel arranged on a side face of the coupling hub and configured to direct injected lubricant to a component of the coupling requiring lubrication; preferably to a bearing arranged adjacent to the coupling hub.

30 . The coupling according to claim 20 , wherein the non-driving end of the drive shaft is configured for connection to a lubricant pump arranged over the drive shaft, and wherein the stud protrudes beyond the lubricant pump.

31 . An oil-free rotary compressor comprising a compression element movably arranged in an oil-free compression chamber, such as a tooth or set of teeth, and a driven shaft configured for driving the compression element;
a driving element, and a drive shaft driven by the driving element; a coupling according to claim 20 for directly coupling the driven shaft and the drive shaft.

32 . The coupling according to claim 31 , further comprising a lubricant injector having an injector nozzle configured to inject a lubricant such as oil onto a side face of a coupling hub; and wherein the coupling hub comprises a bevel arranged on a side surface of the coupling hub, configured to direct injected lubricant to a component of the coupling requiring lubrication; preferably to a conical clamping ring arranged adjacent to the coupling hub.

33 . The coupling according to claim 31 , further comprising a lubricant pump configured to drive a lubricant circuit; wherein the lubricant pump is arranged over a non-driving end of the drive shaft and is connected such that the drive shaft drives the operation of the lubricant pump.

34 . The coupling according to claim 33 , wherein the lubricant pump is connected to the drive shaft by means of a recess arranged in the lubricant pump, which is configured to connect with a projecting element arranged at the end of the drive shaft, or vice versa; preferably wherein the drive shaft comprises a keyway and a key arranged in the keyway.

35 . The coupling according to claim 33 , wherein the lubricant pump comprises an outer rotor and an inner rotor rotatably arranged in the outer rotor; wherein the outer rotor and inner rotor have complementary trochoidal profile shapes.

36 . A method for coupling comprising:
directly coupling a driven shaft and a drive shaft in the drive train of an oil-free rotary compressor using a coupling according to claim 20 .

37 . A method comprising:
using a rotary compressor according to claim 31 to generate oil-free compressed air.

Assignees

• Atlas Copco Airpower Nv

Inventors

• Mathys Flip Frans
• Swerts Thomas Luc
• JACOBS William Maria Dominic
• De Vloo Tom Raymond Jozef Hendrik
• Dewil Dimitri

Classifications

• F04C29/023

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

• F04C2240/603

  with internal channels for fluid distribution, e.g. hollow shaft · CPC title

• F04C2240/60

  Shafts · CPC title

• F04C29/025

  using a lubricant pump · CPC title

• F04C18/084

  Toothed wheels · CPC title