EP2191134A1 - A compressor - Google Patents

A compressor

Info

Publication number
EP2191134A1
EP2191134A1 EP08787517A EP08787517A EP2191134A1 EP 2191134 A1 EP2191134 A1 EP 2191134A1 EP 08787517 A EP08787517 A EP 08787517A EP 08787517 A EP08787517 A EP 08787517A EP 2191134 A1 EP2191134 A1 EP 2191134A1
Authority
EP
European Patent Office
Prior art keywords
crankshaft
point
compressor
undercut
bearing portion
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP08787517A
Other languages
German (de)
French (fr)
Other versions
EP2191134B1 (en
Inventor
Erdem Turfan
Bora Abdik
Umit Fidan
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Arcelik AS
Original Assignee
Arcelik AS
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Arcelik AS filed Critical Arcelik AS
Priority to SI200830225T priority Critical patent/SI2191134T1/en
Publication of EP2191134A1 publication Critical patent/EP2191134A1/en
Application granted granted Critical
Publication of EP2191134B1 publication Critical patent/EP2191134B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
    • F04B39/0094—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00 crankshaft
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
    • F04B39/02—Lubrication
    • F04B39/0223—Lubrication characterised by the compressor type
    • F04B39/023—Hermetic compressors

Definitions

  • the present invention relates to a hermetic compressor wherein the mechanical losses due to friction of the movable components are reduced.
  • a bearing is formed between the inner surface of the cylinder block and the outer surface of the crankshaft during the movement of the crankshaft. Bearing forces are generated on the surfaces forming the bearing due to the forces transmitted from the motor to the crankshaft and the pressure of the gas compressed while the movement is transmitted from the crankshaft to the piston. Friction is present in the bearing resulting from hydrodynamic and/or boundary oiling even though the bearing is lubricated for easy movement of the crankshaft in the bearing.
  • Various implementations are developed in the technique in order to increase lubrication effectiveness and thereby reduce the friction between the crankshaft and the bearing.
  • the aim of the present invention is the realization of a compressor wherein the mechanical losses due to friction of the movable components are reduced.
  • the crankshaft comprises an undercut that is configured to be undulated in accordance with the changes in forces acting on the bearing during the rotation thereof and separates the crankshaft surface into two such that a bearing portion remains above and below.
  • the unnecessary surfaces on the crankshaft surface in the regions that do not support load or supporting small loads are reduced thereby decreasing the frictional losses and the energy yield of the compressor is increased.
  • crankshaft rotates with the drive received from the motor and moves the piston connected thereto back and forth (in the compression-suction direction).
  • the crankshaft connected thereto bends forward a small amount and leans against the bearing from the upper portion.
  • the part (A) of the lower bearing portion on the same side as the eccentric and the part (D) of the upper bearing portion on the opposite side of the eccentric are in contact with the bearing and support load.
  • the other sides (B, C) of the upper and lower bearing portions are neutral.
  • the A and D parts always support a large amount of load during the rotation of the crankshaft, the B and C parts support less load.
  • Figure 1 - is the schematic view of a compressor.
  • Figure 2 - is the front view of a crankshaft in the prior art.
  • Figure 3 - is the front view of a crankshaft.
  • Figure 4 - is the detailed schematic view of a crankshaft lateral surface.
  • Figure 5 - is the schematic view of the crankshaft when the piston is at the lower dead point.
  • Figure 6 - is the schematic view of the crankshaft when the piston is at the upper dead point.
  • the compressor (1) comprises a casing (2), an electric motor having a rotor (3) and a stator (4), a piston (9) that sucks and compresses the refrigerant fluid, moving with the drive received from the motor, a crankshaft (5) connected to the core of the rotor (3) and transmitting the rotational motion of the rotor (3) to the piston (9) as a linear motion, a eccentric (10) that connects the crankshaft (5) to the piston (9), a cylinder block (6) disposed on the upper part of the rotor (3) wherein the crankshaft (5) functions and a bearing (7) formed at the places where the cylinder block (6) and the crankshaft (5) are in contact with each other, providing the crankshaft (5) to bear on the cylinder block (6) in the radial direction and thereby enabling the cylinder block (6) to support the horizontal components of the forces generated during the rotation of the crankshaft (5) ( Figure 1).
  • the crankshaft (5) comprises an undercut (8) that is configured to be undulated in accordance with the changes in forces acting on the bearing (7) during the rotation thereof and separates the lateral side of the crankshaft (5) such that a bearing portion (K, K') is left at the upper and lower parts ( Figure 3).
  • the widest (a) point of the lower bearing portion (K) is in the more load supporting A part and the narrowest (b) point is in the less load supporting B part ( Figure 4).
  • the ratio (b/a) of the widths of the narrowest (b) point and the widest (a) point of the lower bearing portion (K) is within the range of 0,1 and 0,5, preferably 0,2.
  • the ratio (c/d) of the widths of the narrowest (c) point and the widest (d) point of the upper bearing portion (K') is within the range of 0,1 and 0,5, preferably 0,2.
  • the undercut (8) is shaped as a sinus wave.
  • the ratio (b/a) of the widths of the narrowest (b) point and the widest (a) point of the lower bearing portion (K) and the ratio (c/d) of the widths of the narrowest (c) point and the widest (d) point of the upper bearing portion (K') is equal to each other.
  • the frictional surfaces and thereby the mechanical losses are reduced and the compressor performance (COP.) is increased by widening the undercut (8) situated on the crankshaft (5) towards the regions of the bearing portions (K, K') not supporting load.
  • the problems encountered particularly at the initial start-up of the compressor (1) are decreased since the mechanical losses are reduced.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Compressor (AREA)
  • Compressors, Vaccum Pumps And Other Relevant Systems (AREA)
  • Applications Or Details Of Rotary Compressors (AREA)
  • Transition And Organic Metals Composition Catalysts For Addition Polymerization (AREA)

Abstract

The present invention relates to a compressor (1) that comprises a casing (2), an electric motor having a rotor (3) and a stator (4), and a cylinder block (6) enabling the crankshaft (5) to be beared radially by means of a bearing (7) and wherein the frictional forces generated in the bearing (7) during the rotation of the crankshaft (5) is decreased.

Description

Description
A COMPRESSOR
[0001] The present invention relates to a hermetic compressor wherein the mechanical losses due to friction of the movable components are reduced.
[0002] In the hermetic compressors used in cooling devices, a bearing is formed between the inner surface of the cylinder block and the outer surface of the crankshaft during the movement of the crankshaft. Bearing forces are generated on the surfaces forming the bearing due to the forces transmitted from the motor to the crankshaft and the pressure of the gas compressed while the movement is transmitted from the crankshaft to the piston. Friction is present in the bearing resulting from hydrodynamic and/or boundary oiling even though the bearing is lubricated for easy movement of the crankshaft in the bearing. Various implementations are developed in the technique in order to increase lubrication effectiveness and thereby reduce the friction between the crankshaft and the bearing.
[0003] In the European Patent No EP0227880, one of the implementations known in the technique, a cylindrical cut-out is made on the crankshaft for reducing the surface of the crankshaft in contact with the bearing and the bearing is separated into two by this cut-out. However, in this implementation in order for the upper and lower bearing parts to counterbalance the greatest force (oil pressure) acting thereon, the cylindrical shaped cut-out has to be sized not to be greater than the point wherein the force will be the greatest (Figure 2).
[0004] The aim of the present invention is the realization of a compressor wherein the mechanical losses due to friction of the movable components are reduced.
[0005] In the compressor realized in order to attain the aim of the present invention, explicated in the first claim and the respective claims thereof, the crankshaft comprises an undercut that is configured to be undulated in accordance with the changes in forces acting on the bearing during the rotation thereof and separates the crankshaft surface into two such that a bearing portion remains above and below. Thus, the unnecessary surfaces on the crankshaft surface in the regions that do not support load or supporting small loads are reduced thereby decreasing the frictional losses and the energy yield of the compressor is increased.
[0006] The crankshaft rotates with the drive received from the motor and moves the piston connected thereto back and forth (in the compression-suction direction). During this movement, when the piston comes to the rearmost position (lower dead point) wherein the refrigerant fluid is sucked the most, the crankshaft connected thereto bends forward a small amount and leans against the bearing from the upper portion. In this position, the part (A) of the lower bearing portion on the same side as the eccentric and the part (D) of the upper bearing portion on the opposite side of the eccentric are in contact with the bearing and support load. The other sides (B, C) of the upper and lower bearing portions are neutral.
[0007] The piston moves forward as the crankshaft rotates and when the furthermost position (upper dead point) of compressing the most refrigerant fluid is reached, this time the crankshaft leans backwards a very small amount. In this position, again the part of the lower bearing portion on the same side as the eccentric (A) and the part of the upper bearing portion on the opposite side of the eccentric (D) are in contact with the bearing and support load.
[0008] Therefore, the A and D parts always support a large amount of load during the rotation of the crankshaft, the B and C parts support less load.
[0009] By taking this property into consideration, friction is reduced in the compressor of the present invention by making the undercut more in the A and D parts of the crankshaft surface and less in the B and C parts thereby making an undercut in a wider area.
[0010] The compressor realized in order to attain the aim of the present invention is illustrated in the attached figures, where:
[0011] Figure 1 - is the schematic view of a compressor.
[0012] Figure 2 - is the front view of a crankshaft in the prior art.
[0013] Figure 3 - is the front view of a crankshaft.
[0014] Figure 4 - is the detailed schematic view of a crankshaft lateral surface.
[0015] Figure 5 - is the schematic view of the crankshaft when the piston is at the lower dead point. [0016] Figure 6 - is the schematic view of the crankshaft when the piston is at the upper dead point. [0017] The elements illustrated in the figures are numbered as follows:
1. Compressor
2. Casing
3. Rotor
4. Stator
5. Crankshaft
6. Cylinder block
7. Bearing
8. Undercut
9. Piston
10. Eccentric
[0018] The compressor (1) comprises a casing (2), an electric motor having a rotor (3) and a stator (4), a piston (9) that sucks and compresses the refrigerant fluid, moving with the drive received from the motor, a crankshaft (5) connected to the core of the rotor (3) and transmitting the rotational motion of the rotor (3) to the piston (9) as a linear motion, a eccentric (10) that connects the crankshaft (5) to the piston (9), a cylinder block (6) disposed on the upper part of the rotor (3) wherein the crankshaft (5) functions and a bearing (7) formed at the places where the cylinder block (6) and the crankshaft (5) are in contact with each other, providing the crankshaft (5) to bear on the cylinder block (6) in the radial direction and thereby enabling the cylinder block (6) to support the horizontal components of the forces generated during the rotation of the crankshaft (5) (Figure 1).
[0019] The crankshaft (5) comprises an undercut (8) that is configured to be undulated in accordance with the changes in forces acting on the bearing (7) during the rotation thereof and separates the lateral side of the crankshaft (5) such that a bearing portion (K, K') is left at the upper and lower parts (Figure 3).
[0020] During the rotation of the crankshaft (5), when the piston (9) comes to the rearmost position (lower dead point), the crankshaft (5) bends forward and leans against the bearing (7) from the upper portion. In this position, the part (A) of the lower bearing portion (K) on the same side (SE) as the eccentric (10) and the part (D) of the upper bearing portion (K') on the opposite side (SO) of the eccentric (10) are in contact with the bearing (7) and support load. The other sides (B, C) of the upper and lower bearing portions (K, K') do not lean on the bearing (7) (Figure 5).
[0021] The piston (9) moves forward as the crankshaft (5) rotates and when the furthermost position (upper dead point) is reached, this time the crankshaft (5) bends in the opposite direction. The parts of the bearing portions (K, K') that support load are the same since the crankshaft (5) rotates and the leaning direction becomes the opposite direction (Figure 6). In other words, during the rotation of the crankshaft (5), the A and D parts always support more load, the B and C parts support less load. In the compressor (1) of the present invention, an undulated undercut (8) shape is formed by also undercutting these regions that do not support load. Thus, friction is decreased and the compressor (1) operates more efficiently.
[0022] Therefore, the widest (a) point of the lower bearing portion (K) is in the more load supporting A part and the narrowest (b) point is in the less load supporting B part (Figure 4).
[0023] On the other hand, the widest (d) point of the upper bearing portion (K') is in the more load supporting D part and the narrowest (c) point is in the less load supporting C part (Figure 4).
[0024]
[0025] In an embodiment of the present invention, the ratio (b/a) of the widths of the narrowest (b) point and the widest (a) point of the lower bearing portion (K) is within the range of 0,1 and 0,5, preferably 0,2.
[0026] In an embodiment of the present invention, the ratio (c/d) of the widths of the narrowest (c) point and the widest (d) point of the upper bearing portion (K') is within the range of 0,1 and 0,5, preferably 0,2.
[0027] In an embodiment of the present invention, the undercut (8) is shaped as a sinus wave.
[0028] In another embodiment of the present invention, the ratio (b/a) of the widths of the narrowest (b) point and the widest (a) point of the lower bearing portion (K) and the ratio (c/d) of the widths of the narrowest (c) point and the widest (d) point of the upper bearing portion (K') is equal to each other.
[0029] In another embodiment of the present invention, there is a phase difference of around 0 to 45° between the upper side wave shape of the undercut (8) and the lower side wave shape.
[0030] In the compressor (1) of the present invention, the frictional surfaces and thereby the mechanical losses are reduced and the compressor performance (COP.) is increased by widening the undercut (8) situated on the crankshaft (5) towards the regions of the bearing portions (K, K') not supporting load. The problems encountered particularly at the initial start-up of the compressor (1) are decreased since the mechanical losses are reduced.

Claims

Claims
1. A compressor (1) that comprises; - a casing (2), - an electric motor having a rotor (3) and a stator (4), - a piston (9) that sucks and compresses the refrigerant fluid, moving with the drive received from the motor, - a crankshaft (5) connected to the core of the rotor (3) and transmitting the rotational motion of the rotor (3) to the piston (9) as a linear motion, - a eccentric (10) that connects the crankshaft (5) to the piston (9), - a cylinder block (6) disposed on the upper part of the rotor (3) wherein the crankshaft (5) functions and - a bearing (7) formed at the places where the cylinder block (6) and the crankshaft (5) are in contact with each other, providing the crankshaft (5) to bear on the cylinder block (6) in the radial direction and thereby enabling the cylinder block (6) to support the horizontal components of the forces generated during the rotation of the crankshaft (5) and - an undercut (8) that separates the lateral side of the crankshaft (5) such that a bearing portion (K, K') is left at the upper and lower parts and characterized by an undercut (8) is configured to be undulated in accordance with the changes acting on the bearing (7) during the rotation of the crankshaft (5).
2. A compressor (1) as in Claim 1 , characterized by an undercut (8) wherein the part of the lower bearing portion (K) on the opposite side (SO) of the eccentric (10) is wider than the part of the upper bearing portion (K') on the same side (SE) of the eccentric (10).
3. A compressor (1) as in Claim 1 or 2, characterized by an undercut (8) that is formed such that the widest (a) point of the lower bearing portion (K) is on the side (SE) of the eccentric (10) and the narrowest (b) point is on the opposite side (SO) of the eccentric (10).
4. A compressor (1) as in any one of the above Claims, characterized by an undercut (8) that is formed such that the widest (d) point of the upper bearing portion (K') is on the opposite side (SO) of the eccentric (10) and the narrowest (c) point is on the side (SE) of the eccentric (10).
5. A compressor (1) as in any one of the above Claims, characterized by an undercut (8) that is formed such that the ratio (b/a) of the widths of the narrowest (b) point and the widest (a) point of the lower bearing portion (K) is within the range of 0,1 and 0,5.
6. A compressor (1) as in any one of the above Claims, characterized by an undercut (8) that is formed such that the ratio (c/d) of the widths of the narrowest (c) point and the widest (d) point of the upper bearing portion (K') is within the range of 0,1 and 0,5.
7. A compressor (1) as in any one of the above Claims, characterized by an undercut (8) that is shaped as a sinus wave.
8. A compressor (1) as in any one of the Claims 1 to 7, characterized by an undercut (8) wherein the ratio (b/a) of the widths of the narrowest (b) point and the widest (a) point of the lower bearing portion (K) and the ratio (c/d) of the widths of the narrowest (c) point and the widest (d) point of the upper bearing portion (K') is equal to each other.
9. A compressor (1) as in any one of the Claims 1 to 7, characterized by an undercut (8) wherein there is a phase difference of around 0 to 45° between the upper side wave shape and the lower side wave shape.
EP08787517A 2007-08-31 2008-08-27 A compressor Active EP2191134B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
SI200830225T SI2191134T1 (en) 2007-08-31 2008-08-27 A compressor

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
TR200706032 2007-08-31
PCT/EP2008/061224 WO2009027435A1 (en) 2007-08-31 2008-08-27 A compressor

Publications (2)

Publication Number Publication Date
EP2191134A1 true EP2191134A1 (en) 2010-06-02
EP2191134B1 EP2191134B1 (en) 2011-01-19

Family

ID=39884726

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08787517A Active EP2191134B1 (en) 2007-08-31 2008-08-27 A compressor

Country Status (8)

Country Link
EP (1) EP2191134B1 (en)
CN (1) CN101842591B (en)
AT (1) ATE496219T1 (en)
BR (1) BRPI0815798A2 (en)
DE (1) DE602008004672D1 (en)
ES (1) ES2356884T3 (en)
SI (1) SI2191134T1 (en)
WO (1) WO2009027435A1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BR102012025039B1 (en) * 2012-10-01 2021-09-28 Embraco Indústria De Compressores E Soluções Em Refrigeração Ltda RADIAL BEARING IMPROVEMENTS IN AN ALTERNATIVE COOLING COMPRESSOR

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1023018A (en) * 1963-09-27 1966-03-16 Dkk Scharfenstein Veb Oil-delivery arrangement
JPS53130507A (en) * 1977-04-20 1978-11-14 Hitachi Ltd Totally-enclosed motor compressor
CN1143959C (en) * 1999-06-14 2004-03-31 松下冷机株式会社 Hermetic motor-driven compressor
CN1255630C (en) * 2001-12-17 2006-05-10 Lg电子株式会社 Crank shaft in dual capacity compressor

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2009027435A1 *

Also Published As

Publication number Publication date
ES2356884T3 (en) 2011-04-14
EP2191134B1 (en) 2011-01-19
WO2009027435A1 (en) 2009-03-05
ATE496219T1 (en) 2011-02-15
SI2191134T1 (en) 2011-05-31
CN101842591B (en) 2012-10-10
BRPI0815798A2 (en) 2015-02-18
DE602008004672D1 (en) 2011-03-03
CN101842591A (en) 2010-09-22

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