EP0502487A1 - Motor-compressor unit with its cylinder head formed in parts of different materials - Google Patents
Motor-compressor unit with its cylinder head formed in parts of different materials Download PDFInfo
- Publication number
- EP0502487A1 EP0502487A1 EP92103641A EP92103641A EP0502487A1 EP 0502487 A1 EP0502487 A1 EP 0502487A1 EP 92103641 A EP92103641 A EP 92103641A EP 92103641 A EP92103641 A EP 92103641A EP 0502487 A1 EP0502487 A1 EP 0502487A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- motor
- cylinder head
- compressor unit
- portions
- cylinder
- 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
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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
- F04B39/12—Casings; Cylinders; Cylinder heads; Fluid connections
- F04B39/125—Cylinder heads
Definitions
- This invention relates to a motor-compressor unit, in particular for a refrigerator, comprising a cylinder body within which a piston moves to compress a gas, a cylinder head fixed to one end of said cylinder body, and a plate (valve plate) which is interposed between said cylinder head and body and with which usual valves are associated acting on the intake port and delivery port.
- Cavities are provided in the cylinder head.
- the intake cavity is positioned to correspond with the intake valve to collect the gas to be compressed within the cylinder body (or simply cylinder).
- a further cavity is positioned to correspond with the delivery valve, to receive the compressed gas which is to be discharged from the cylinder head.
- the cylinder head is constructed of metal (cast iron, pressed plate, aluminium), to reliably resist the mechanical stresses generated within it during gas compression and the thermal stresses deriving from the gas after its compression.
- metal cast iron, pressed plate, aluminium
- the high temperature of the compressed gas present in the discharge cavity is transferred by conduction through the material of the head to reach the part which defines its intake cavity.
- An object of the invention is therefore to provide a motor-compressor unit in which the heating of the cylinder head intake cavity is reduced, so preventing excessive heating of the intake gas.
- a further object is to provide a motor-compressor unit having a thermodynamic efficiency greater than motor-compressor units of the state of the art.
- a further object is to provide a motor-compressor unit of the stated type which is of simple construction, low cost and reliable operation.
- a motor-compressor unit of the aforesaid type characterised in that the cylinder head is formed of at least two mutually coupled hollow portions defining respectively at least one intake cavity and one discharge cavity, at least one of said portions being constructed of a material of low thermal conductivity.
- the compressor is indicated overall by 1 and comprises a casing 2 comprising two half-casings 3 and 4 joined together in known manner.
- the casing 2 contains a cylinder body 5 (or simply cylinder) within which a usual piston 6 moves, operated by a connecting rod 7 associated with a usual shaft (not shown) driven in known manner.
- the cylinder 5 is connected in the usual manner to a stator 8, the assembly thus formed being supported by usual springs 9 (only one of which is shown) secured in known manner to the half-casing 4.
- a cylinder head 10 is associated with one end of the cylinder 5. Between the cylinder and head 10 there is a plate 11 in which ports 12 and 13 are provided for the intake and discharge of the gas to be compressed respectively, and on which movable valves 14 and 15 (not shown in Figure 4) are positioned.
- the plate 11 therefore acts as a valve plate and is separated from the head 10 and cylinder 11 by seal members or gaskets 16 and 17.
- the body 18 of the cylinder head 10 is provided with holes 19 for receiving usual elements (screws) 19A for fixing the head 10 to the cylinder 5.
- a usual gas intake duct 20 is also connected to the head 10.
- the head 10 comprises at least two hollow portions 21 and 22 to be coupled together, a first portion 21 being constructed of metal and the second portion 22 being constructed of plastics material or in any event a material of low thermal conductivity.
- the two portions 21 and 22 are physically separated from each other by a space 23 and comprise cavities 21A and 22A acting as the discharge and intake cavity respectively.
- the first portion 21 comprises a flat part 25 containing the holes 19 for the elements or screws 19A for its fixing to the cylinder 5. From the part 25 there extends a raised part 26 (in which the discharge cavity 21A is formed) comprising a recess 28 to receive a projecting part or projection 29 of the second portion 22, which has a sunken part 31 from which there extends a raised part 32 provided with the projection 29. In this latter there is provided the intake cavity 22A, which is connected to other cavities 22B and 22C. The projection 29 is prolonged so that the intake cavity is positioned over the port 12 in the valve plate 11.
- projections 33 facing the interior of said recess, and undercuts 34.
- the projections are intended to cooperate with indentations 35 in the projection 29, whereas the undercuts 34 are intended to cooperate with shoulders 36 provided on the sides of said projection.
- This latter also comprises further lateral hollow seats 41 and 42 intended to cooperate with feet 44 provided on the sunken part 31 (overlying this latter).
- the cooperation between the feet 39 and 44 and the seats 40, 41 and 42 maintains the two portions 21 and 22 coupled to each other on tightening the screws 19A, and maintains the plastics portion 22 clamped against the gasket 16 and against the valve plate 5.
- the portion 21 presses against the foot 32 and feet 44. In this manner the clamping force of the screws against said portion 21 is also transferred to the portion 22, which is pressed against the gasket 16. By this means the portion 22 is secured to the body of the cylinder 5.
- feet 39 and 44 can deform under the action (pressing towards the plate 11) of the portion 21, ie under the clamping force of the screws in the holes 19.
- the feet 39 and 44 deform elastically by an amount which can be previously evaluated and be chosen by the designer.
- the relationship between deformation and elastic reaction of the material and the relationship between the elastic reaction and temperature of the material as a function of time enables the designer to determine the dimensions of the feet, the system for fixing the portion 22 onto the plate 11 and hence the dimensions of this portion and of its feet in a very reliable manner.
- the portion 22 is constructed of a material of low thermal conductivity (ie a poor heat conductor) and as it is physically separated from the metal portion 21 (by the space 23), there is no heat passage between said portions 21 and 22.
- Heat passage is further impeded by the presence of the usual refrigerant gas within the casing 2 of the motor-compressor unit and thus within the space 23.
- the portion 22 acts as a silencer as it does not function as a resonance box for the sounds generated by the fluid passing through it. This may allow the silencer present in known motor-compressor units to be dispensed with, thus reducing construction time, and contributes to noise reduction.
- a plastics muffler (indicated by 50 in Figure 4) can be provided, associated with the portion 22.
- the motor-compressor unit is of simpler construction than known units, is of lower cost than these and is very reliable in use.
- plastics portion 22 there are no mechanical strength problems associated with the cylinder head, as the gas present in the portion 22 is of low temperature and pressure such as not to generate within the head any stresses harmful to its mechanical integrity.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Compressor (AREA)
Abstract
Description
- This invention relates to a motor-compressor unit, in particular for a refrigerator, comprising a cylinder body within which a piston moves to compress a gas, a cylinder head fixed to one end of said cylinder body, and a plate (valve plate) which is interposed between said cylinder head and body and with which usual valves are associated acting on the intake port and delivery port.
- Cavities are provided in the cylinder head. One of these, the intake cavity, is positioned to correspond with the intake valve to collect the gas to be compressed within the cylinder body (or simply cylinder). A further cavity (discharge cavity) is positioned to correspond with the delivery valve, to receive the compressed gas which is to be discharged from the cylinder head. As is well known, the cylinder head is constructed of metal (cast iron, pressed plate, aluminium), to reliably resist the mechanical stresses generated within it during gas compression and the thermal stresses deriving from the gas after its compression. However, such a construction is detrimental to the thermodynamic efficiency of the compressor.
- In this respect, being completely of metal, the high temperature of the compressed gas present in the discharge cavity is transferred by conduction through the material of the head to reach the part which defines its intake cavity.
- Consequently, in this latter there is a state of high temperature which heats the intake gas, so reducing the efficiency of the compression process.
- Various methods have been devised to prevent heating of the intake gas.
- However, these methods have not adequately solved the problem. In addition, the known methods do not provide high reliability during the operation of the motor-compressor unit.
- Finally, the cylinder heads of known motor-compressor units generate intense noise, as they act as resonance boxes for the gas passing through them.
- An object of the invention is therefore to provide a motor-compressor unit in which the heating of the cylinder head intake cavity is reduced, so preventing excessive heating of the intake gas.
- A further object is to provide a motor-compressor unit having a thermodynamic efficiency greater than motor-compressor units of the state of the art.
- A further object is to provide a motor-compressor unit of the stated type which is of simple construction, low cost and reliable operation.
- These and further objects which will be apparent to the expert of the art are attained by a motor-compressor unit of the aforesaid type, characterised in that the cylinder head is formed of at least two mutually coupled hollow portions defining respectively at least one intake cavity and one discharge cavity, at least one of said portions being constructed of a material of low thermal conductivity.
- The present invention will be more apparent from the accompanying drawing, which is provided by way of non-limiting example and in which:
- Figure 1 is a partial view, shown in section on the line I-I of Figure 3, of a motor-compressor unit constructed in accordance with the invention;
- Figure 2 is an exploded view from above of part of the motor-compressor unit of Figure 1;
- Figure 3 is an assembled view from above of the part shown in Figure 2; and
- Figure 4 is a section on the line IV-IV of Figure 2.
- With reference to said figures the compressor is indicated overall by 1 and comprises a
casing 2 comprising two half-casings 3 and 4 joined together in known manner. - The
casing 2 contains a cylinder body 5 (or simply cylinder) within which ausual piston 6 moves, operated by a connectingrod 7 associated with a usual shaft (not shown) driven in known manner. Thecylinder 5 is connected in the usual manner to astator 8, the assembly thus formed being supported by usual springs 9 (only one of which is shown) secured in known manner to the half-casing 4. - A
cylinder head 10 is associated with one end of thecylinder 5. Between the cylinder andhead 10 there is aplate 11 in whichports movable valves 14 and 15 (not shown in Figure 4) are positioned. Theplate 11 therefore acts as a valve plate and is separated from thehead 10 andcylinder 11 by seal members orgaskets - The
body 18 of thecylinder head 10 is provided withholes 19 for receiving usual elements (screws) 19A for fixing thehead 10 to thecylinder 5. - A usual
gas intake duct 20 is also connected to thehead 10. According to the invention thehead 10 comprises at least twohollow portions first portion 21 being constructed of metal and thesecond portion 22 being constructed of plastics material or in any event a material of low thermal conductivity. - The two
portions space 23 and comprisecavities - Specifically, the
first portion 21 comprises aflat part 25 containing theholes 19 for the elements orscrews 19A for its fixing to thecylinder 5. From thepart 25 there extends a raised part 26 (in which thedischarge cavity 21A is formed) comprising a recess 28 to receive a projecting part orprojection 29 of thesecond portion 22, which has asunken part 31 from which there extends araised part 32 provided with theprojection 29. In this latter there is provided theintake cavity 22A, which is connected toother cavities projection 29 is prolonged so that the intake cavity is positioned over theport 12 in thevalve plate 11. - On the
edge 28A of the recess 28 there areprojections 33 facing the interior of said recess, and undercuts 34. The projections are intended to cooperate withindentations 35 in theprojection 29, whereas theundercuts 34 are intended to cooperate withshoulders 36 provided on the sides of said projection. - In addition, on the end of this latter there is a
depression 38 from which there extends afoot 39 intended to cooperate with ahollow seat 40 provided in theportion 21. - This latter also comprises further lateral
hollow seats feet 44 provided on the sunken part 31 (overlying this latter). The cooperation between thefeet seats portions screws 19A, and maintains theplastics portion 22 clamped against thegasket 16 and against thevalve plate 5. - In this respect, after suitably engaging the
portions foot 39 andfeet 44 in theseats valve plate 11 on which thegasket 16 is present. - Then by inserting the screws (or other fixing members) through the
holes 19 and tightening them, theportion 21 is clamped against this gasket. - Via the
seats portion 21 presses against thefoot 32 andfeet 44. In this manner the clamping force of the screws against saidportion 21 is also transferred to theportion 22, which is pressed against thegasket 16. By this means theportion 22 is secured to the body of thecylinder 5. - It should be noted that the
feet portion 21, ie under the clamping force of the screws in theholes 19. - The
feet - In this respect, the relationship between deformation and elastic reaction of the material and the relationship between the elastic reaction and temperature of the material as a function of time enables the designer to determine the dimensions of the feet, the system for fixing the
portion 22 onto theplate 11 and hence the dimensions of this portion and of its feet in a very reliable manner. - With such a construction it is not the clamping force of the screws but the elastic reaction of the component plastics material of the
portion 22 and said feet which ensures a sufficient force to keep theportion 22 retained (clamped) against thegasket 16 andplate 11. - The construction of the
cylinder head 10 is apparent from the aforegoing description. - During the use of the compressor, as the
portion 22 is constructed of a material of low thermal conductivity (ie a poor heat conductor) and as it is physically separated from the metal portion 21 (by the space 23), there is no heat passage between saidportions - Heat passage is further impeded by the presence of the usual refrigerant gas within the
casing 2 of the motor-compressor unit and thus within thespace 23. - High temperature is therefore not reached within the
intake cavity 22A of thecylinder head 10 of the motor-compressor unit 1. This prevents heating of the intake gas and improves the thermodynamic compression efficiency. - In addition, the
portion 22 acts as a silencer as it does not function as a resonance box for the sounds generated by the fluid passing through it. This may allow the silencer present in known motor-compressor units to be dispensed with, thus reducing construction time, and contributes to noise reduction. - In any event, to further increase noise reduction a plastics muffler (indicated by 50 in Figure 4) can be provided, associated with the
portion 22. - The motor-compressor unit is of simpler construction than known units, is of lower cost than these and is very reliable in use. In addition, with the
plastics portion 22 there are no mechanical strength problems associated with the cylinder head, as the gas present in theportion 22 is of low temperature and pressure such as not to generate within the head any stresses harmful to its mechanical integrity. - A particular embodiment of the invention has been described. However, modifications can be made such as joining the two
portions - This and equivalent embodiments are however to be considered as falling within the scope of the present document.
Claims (8)
- A motor-compressor unit, in particular for a refrigerator, comprising a cylinder body within which a piston moves to compress a gas, a cylinder head fixed to one end of said cylinder body, and a plate which is interposed between said cylinder head and body and with which usual valves are associated acting on the intake port (12) and delivery port (13), characterised in that the cylinder head (10) is formed of at least two mutually coupled hollow portions (21, 22) defining respectively at least one intake cavity (22A) and one discharge cavity (21A), at least one of said portions (22) being constructed of a material of low thermal conductivity.
- A motor-compressor unit as claimed in claim 1, characterised in that the portions (21, 22) of the cylinder head (10) are physically separated from each other, at least in part.
- A motor-compressor unit as claimed in claim 1, characterised in that a first portion (21) is constructed of metal and comprises a flat part (25) in which holes (19) are provided to allow the cylinder head (10) to be fixed to the cylinder body (5), from said flat part (25) there extending a raised portion (26) defining the discharge cavity (21A) and comprising a recess (28) to receive a projection (29) from a corresponding part (32) of the second portion (22) defining the intake cavity (22A), said second portion (22) being constructed of material of low thermal conductivity.
- A motor-compressor unit as claimed in claim 3, characterised in that the second portion (22) is of plastics material.
- A motor-compressor unit as claimed in claim 3, characterised in that on the edge (28A) of the recess (28) of the first portion (21) there are provided projecting elements (33) and undercuts (34) arranged to cooperate with indentations (35) and shoulders (36) of the second portion (22).
- A motor-compressor unit as claimed in claim 3, characterised in that the second portion (22) carries deformable projecting elements (39, 44) arranged to cooperate, by pressing, with seats (40, 44) provided in the first portion (21).
- A motor-compressor unit as claimed in claims 2 and 3, characterised in that between the portions (21, 22) of the cylinder head (10) there is provided a space (23), said space being advantageously between the projection (29) on the second portion (22) and the respective recess (28) in said first portion.
- A motor-compressor unit as claimed in claims 1 and 3, characterised in that the two portions (21, 22) of the cylinder head (10) are mechanically fixed together.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ITMI910170U | 1991-03-05 | ||
IT000170 IT221682Z2 (en) | 1991-03-05 | 1991-03-05 | MOTOR-COMPRESSOR WITH HEAD MADE OF DIFFERENT MATERIALS |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0502487A1 true EP0502487A1 (en) | 1992-09-09 |
EP0502487B1 EP0502487B1 (en) | 1995-05-17 |
Family
ID=11358248
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19920103641 Expired - Lifetime EP0502487B1 (en) | 1991-03-05 | 1992-03-03 | Motor-compressor unit with its cylinder head formed in parts of different materials |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP0502487B1 (en) |
AR (1) | AR247442A1 (en) |
BR (1) | BR9200703A (en) |
DE (1) | DE69202495T2 (en) |
IT (1) | IT221682Z2 (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2793848A1 (en) * | 1999-01-13 | 2000-11-24 | Toyota Motor Co Ltd | FLUID PUMP |
FR2800425A1 (en) * | 1999-10-27 | 2001-05-04 | Sanden Corp | Compressor, for refrigeration cycle using carbon dioxide as cooling fluid, has aluminum suction/air and steel discharge/suction separation chambers |
FR2847953A1 (en) * | 2002-11-28 | 2004-06-04 | Zexel Valeo Compressor Europe | Axial piston compressor, especially for vehicle air conditioning system, has cylinder head in two or more sections made from different materials |
FR2925623A1 (en) * | 2007-12-21 | 2009-06-26 | Danfoss Commercial Compressors | HEAD FOR REFRIGERATING COMPRESSOR WITH A PISTON, COMPRESSOR UNIT COMPRISING SAID HEAD, AND REFRIGERANT COMPRESSOR COMPRISING THE COMPRESSOR UNIT |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3332259A1 (en) * | 1983-09-07 | 1985-03-28 | Danfoss A/S, Nordborg | REFRIGERATOR COMPRESSORS |
EP0195486A2 (en) * | 1985-03-21 | 1986-09-24 | Whirlpool International B.V. | Hermetic motor-compressor unit for a refrigeration circuit |
GB2199620A (en) * | 1987-01-12 | 1988-07-13 | White Consolidated Ind Inc | Compressor head and suction muffler for hermetic compressor |
-
1991
- 1991-03-05 IT IT000170 patent/IT221682Z2/en active IP Right Grant
-
1992
- 1992-02-28 BR BR9200703A patent/BR9200703A/en not_active IP Right Cessation
- 1992-02-28 AR AR32185592A patent/AR247442A1/en active
- 1992-03-03 DE DE1992602495 patent/DE69202495T2/en not_active Expired - Fee Related
- 1992-03-03 EP EP19920103641 patent/EP0502487B1/en not_active Expired - Lifetime
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3332259A1 (en) * | 1983-09-07 | 1985-03-28 | Danfoss A/S, Nordborg | REFRIGERATOR COMPRESSORS |
EP0195486A2 (en) * | 1985-03-21 | 1986-09-24 | Whirlpool International B.V. | Hermetic motor-compressor unit for a refrigeration circuit |
GB2199620A (en) * | 1987-01-12 | 1988-07-13 | White Consolidated Ind Inc | Compressor head and suction muffler for hermetic compressor |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2793848A1 (en) * | 1999-01-13 | 2000-11-24 | Toyota Motor Co Ltd | FLUID PUMP |
FR2800425A1 (en) * | 1999-10-27 | 2001-05-04 | Sanden Corp | Compressor, for refrigeration cycle using carbon dioxide as cooling fluid, has aluminum suction/air and steel discharge/suction separation chambers |
FR2847953A1 (en) * | 2002-11-28 | 2004-06-04 | Zexel Valeo Compressor Europe | Axial piston compressor, especially for vehicle air conditioning system, has cylinder head in two or more sections made from different materials |
FR2925623A1 (en) * | 2007-12-21 | 2009-06-26 | Danfoss Commercial Compressors | HEAD FOR REFRIGERATING COMPRESSOR WITH A PISTON, COMPRESSOR UNIT COMPRISING SAID HEAD, AND REFRIGERANT COMPRESSOR COMPRISING THE COMPRESSOR UNIT |
WO2009081019A1 (en) * | 2007-12-21 | 2009-07-02 | Danfoss Commercial Compressors | Cylinder head for piston refrigeration compressor, compression unit including such cylinder head, and piston refrigeration compressor including said compression unit |
Also Published As
Publication number | Publication date |
---|---|
DE69202495D1 (en) | 1995-06-22 |
EP0502487B1 (en) | 1995-05-17 |
AR247442A1 (en) | 1994-12-29 |
IT221682Z2 (en) | 1994-09-13 |
ITMI910170V0 (en) | 1991-03-05 |
BR9200703A (en) | 1992-11-10 |
ITMI910170U1 (en) | 1992-09-05 |
DE69202495T2 (en) | 1996-02-01 |
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