EP3017194B1 - Thermally improved reciprocating hermetic compressor - Google Patents

Thermally improved reciprocating hermetic compressor Download PDF

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Publication number
EP3017194B1
EP3017194B1 EP13735006.2A EP13735006A EP3017194B1 EP 3017194 B1 EP3017194 B1 EP 3017194B1 EP 13735006 A EP13735006 A EP 13735006A EP 3017194 B1 EP3017194 B1 EP 3017194B1
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EP
European Patent Office
Prior art keywords
shaft
cylinder head
hole
exhaust
hermetic compressor
Prior art date
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Active
Application number
EP13735006.2A
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German (de)
French (fr)
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EP3017194A1 (en
Inventor
Bilgin Hacioglu
Ozkan OZTURK
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
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Arcelik AS
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Priority to SI201330630A priority Critical patent/SI3017194T1/en
Publication of EP3017194A1 publication Critical patent/EP3017194A1/en
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Publication of EP3017194B1 publication Critical patent/EP3017194B1/en
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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
    • F04B39/0027—Pulsation and noise damping means
    • F04B39/0055—Pulsation and noise damping means with a special shape of fluid passage, e.g. bends, throttles, diameter changes, pipes
    • F04B39/0072—Pulsation and noise damping means with a special shape of fluid passage, e.g. bends, throttles, diameter changes, pipes characterised by assembly or mounting
    • 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
    • F04B39/0027—Pulsation and noise damping means
    • F04B39/0055—Pulsation and noise damping means with a special shape of fluid passage, e.g. bends, throttles, diameter changes, pipes
    • 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
    • F04B39/0027—Pulsation and noise damping means
    • F04B39/0055—Pulsation and noise damping means with a special shape of fluid passage, e.g. bends, throttles, diameter changes, pipes
    • F04B39/0061—Pulsation and noise damping means with a special shape of fluid passage, e.g. bends, throttles, diameter changes, pipes using muffler volumes
    • 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
    • F04B39/123—Fluid connections
    • 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

  • the present invention relates to a reciprocating compressor for use in refrigeration appliance such as a domestic refrigerator, and particularly to a coupling suitable for hermetically joining an exhaust tube directly to a cylinder head of the reciprocating compressor.
  • a refrigeration appliance such as a domestic refrigerator typically utilizes a reciprocating compressor to convey the refrigerant from an evaporator to a condenser.
  • the reciprocating compressor e.g. as disclosed in US 5,205,719 (A ) generally comprises a compression chamber, a suction chamber, and an exhaust chamber.
  • the suction chamber is located on a downstream side of the evaporator whereas the exhaust chamber is located on an upstream side of the condenser.
  • the compression chamber is formed within the cylinder block.
  • the suction chamber and the exhaust chamber are separately formed within the cylinder head.
  • a valve plate is interposed between the cylinder block and the cylinder head. By virtue of the valve plate, the compression chamber is selectively brought into fluid connection with the suction chamber and the exhaust chamber.
  • the valve plate generally comprises an intake port and exhaust port.
  • the intake port and exhaust port are typically configured by diaphragm check valves which allow the refrigerant to flow only in a single direction.
  • the intake port fluidly connects the suction chamber with the compression chamber upon suction of a piston located in the compression chamber.
  • the exhaust port fluidly connects the compression chamber with the exhaust chamber upon compression of the piston.
  • the reciprocating movement of the piston induces pressure waves in the refrigerant, which have a detrimental effect on the components of the compressor. Therefore, the refrigerant in the exhaust chamber is initially guided through an exhaust passage to an exhaust silencer for attenuating the pressure pulsation of the refrigerant, prior to returning the same to the refrigeration circuit of the refrigeration appliance.
  • the temperature of the refrigerant in the exhaust chamber is considerably higher than the temperature of the refrigerant in the suction chamber due to the compression effectuated to the refrigerant by the piston. Consequently, the excess heat of the refrigerant in the exhaust passage is partly released to the other components of the compressor such as the compression chamber, the suction chamber, a motor and the like which are in the vicinity of the exhaust passage. Hence, an overall efficiency of the compressor decreases. Therefore, heat transfer from the exhaust refrigerant to the aforementioned critical components of the compressor must be reduced.
  • US 5,288,212 (A ) discloses a hermetic reciprocating compressor which includes an exhaust chamber and a suction chamber wherein the cover walls of the exhaust chamber and a suction chamber are spaced apart from each other by a predetermined clearance.
  • a thermal insulation plate is installed in the suction chamber.
  • An objective of the present invention is to provide a reciprocating compressor, and a refrigeration appliance having the same, which overcomes the aforementioned problems, and effectively reduces heat transfer from the exhaust refrigerant to the critical components of the compressor.
  • the exhaust silencer for attenuating pressure pulsation of refrigerant received from the exhaust chamber is separately provided from the cylinder head.
  • the reciprocating compressor according to the present invention further comprises a metal exhaust tube for guiding the refrigerant from the exhaust chamber to the exhaust silencer; and a metal coupling for fluidly connecting an interior of the exhaust chamber with the exhaust tube.
  • the coupling according to the present invention includes: a metal body penetrating throughout a through hole formed in a wall portion of the cylinder head; a hollow part being formed in the metal body, defining a refrigerant flow path from the exhaust chamber to the exhaust tube; a first fixing part integrally provided with the metal body, threadably securing the body to the cylinder head; and a second fixing part integrally provided with the metal body, for gas-tightly joining, an opening of the exhaust tube to the hollow part by a welding joint.
  • the coupling is provided in form of a metal bolt, preferably made of steel.
  • the bolt has a threaded shaft which is threadably engaged with an internal thread of the through hole formed into the wall portion of cylinder head.
  • the shaft has a through bore along its axis which serves as the refrigerant flow path.
  • the shaft partly projects out of the cylinder head.
  • the exhaust tube is joined, by welding to a tip end of the shaft projecting out of the cylinder head.
  • An opening of the exhaust tube is in fluid communication with an opening of the through bore of the shaft.
  • the bolt has a head which secures the shaft to the through hole in the wall portion of the cylinder head.
  • the bolt is firmly screwed into the wall portion.
  • the bolt is alternatively fastened to the wall portion of the exhaust chamber by a nut screwed onto the threaded shaft projecting out of the cylinder head. In this embodiment, it is has been dispensed with to form an internal thread into the wall portion enclosing the through hole.
  • the inner diameter of the through bore is substantially constant along the shaft and matches with an inner diameter of the exhaust tube. Thereby, uniform flow impedance is attained. A pressure drop in the exhaust refrigerant flow is prevented and an efficient operation of the compressor is safeguarded.
  • the cylinder head is made of aluminum.
  • the aluminum cylinder head has improved corrosion resistance.
  • both the exhaust tube and the coupling are made of steel. Thereby, the exhaust tube can be joined to the coupling by welding. Such welding joint is robust and also reliable in view of gas-tightness.
  • the reciprocating hermetic compressor (1) is suitable for use in a refrigeration appliance, in particular a domestic refrigerator (not shown) comprises a cylinder block (2) having a compression chamber (3), a cylinder head (4) having a suction chamber (5) and separately therefrom, an exhaust chamber (6), each being in fluid connection with the compression chamber (3) through a valve plate (7) interposed between the cylinder block (2) and the cylinder head (4) an exhaust silencer, separately provided from the cylinder head (4) for attenuating pressure pulsation of refrigerant received from the exhaust chamber (6) ( Fig. 1 ).
  • the reciprocating hermetic compressor (1) further comprises a metal exhaust tube (8) for guiding the refrigerant in the exhaust chamber (6) to the exhaust silencer (not shown), a metal coupling (9) for fluidly connecting an interior of the exhaust chamber (6) with the exhaust tube (8), said coupling (9) including a metal body penetrating throughout a through hole (10) formed in a wall portion (11) of the cylinder head (4), a hollow part formed in the metal body, defining a refrigerant flow path from the exhaust chamber (6) to the exhaust tube (8), a first fixing part integrally provided with the metal body, threadably securing the body to the cylinder head (4) and a second fixing part integrally provided with the metal body, gas-tightly joining, an opening of the exhaust chamber (6) to the hollow part by a welding joint ( Figs. 2 and 3 ; Figs. 9 and 10 ).
  • the coupling (9) is manufactured as a metal bolt, preferably made from steel ( Figs. 4 and 5 ).
  • the bolt includes a shaft (12) which penetrates throughout said through hole (10) ( Figs. 2, 3 , 5 , and 8 ).
  • a through bore (13) is formed along the shaft (12), which configures the hollow part ( Fig. 5 ).
  • the bolt further includes a head (14) which abuts against an inner wall portion (11) of the cylinder head (4), surrounding the through hole (10) ( Figs. 5 and 8 ).
  • the bolt further includes a first thread (15) which is formed on the shaft (12) for threadably engaging with a second thread (16) which is formed inside said through hole (10) of the cylinder head (4) ( Figs.
  • the head (14) and the first tread (15) configure the first fixing part.
  • a tip end of the shaft (12) projects out of the through hole (10) ( Figs. 2, 3 , and 8 ).
  • a tip end of the shaft (12) configures the second fixing part.
  • the exhaust tube (8) is welded to said tip end of the shaft (15) ( Figs. 2, 3 , and 8 )
  • the first thread (15) is formed just behind the head (14) of the bolt to oppose said second thread (16) when the head (14) abuts against the inner wall portion (11) ( Fig. 5 to 7 ). Thereby, a tight engagement between the wall portion (11) and the bolt is attained.
  • a second thread (16) has not been formed inside the through hole (10) of the cylinder head (4) ( Figs. 11 and 12 ). Instead, a nut (17) is used for fastening the bolt ( Fig. 13 ).
  • the coupling (9) is also provided in form of a metal bolt ( Figs. 4 and 5 ).
  • the bolt includes a shaft (12) which penetrates throughout said through hole (10) in the cylinder head (4) ( Figs. 9, 10 , and 13 ).
  • a through bore (13) is formed along the shaft (12), which configures the hollow part ( Fig. 5 ).
  • the bolt further includes a head (14) which abuts against an inner wall portion (11) of the cylinder head (4), surrounding the through hole (10) ( Figs. 5 and 13 ).
  • the bolt further includes a first thread (15) formed on the shaft (12), which receives a nut (17) that abuts against an outer wall portion (11) of the cylinder head (4), surrounding the through hole (10) ( Figs. 5 , 9 to 13 ).
  • the head (14), the first tread (15), and the nut (17) configure the first fixing part.
  • a tip end of the shaft (12) projects out of the through hole (10) ( Figs. 9, 10 , and 13 ).
  • said tip end of the shaft (12) configures the second fixing part.
  • the exhaust tube (8) is welded to said tip end of the shaft (12) ( Figs. 9, 10 , and 13 ).
  • the first thread (15) is formed on a portion of the shaft (12) which projects out of the through hole (10) ( Figs. 9, 10 , and 13 ). Thereby, the nut (17) can be tightly screwed onto the shaft (12).
  • an inner diameter of the through bore (16) is constant along the shaft (12) and matches with an inner diameter of the exhaust tube (8) ( Fig. 5 , 8 and 13 ).
  • the head (14) has a flange (18) ( Fig.5 ).
  • the flange (18) abuts against an inner wall portion (11) of the cylinder head (4) which surrounds the through hole (10) ( Figs. 8 and 13 ).
  • the bolt is not provided with a flange (18).
  • a washer (not shown) is used. The washer is placed between the head (14) and an inner wall portion (11) of the cylinder head (4), which surrounds the through hole (10).
  • the cylinder head (4) is made of aluminum.
  • both the exhaust tube (8) and the coupling (9) are made of steel. Thereby, the exhaust tube (8) and the coupling (9) can be welded to establish a gas-tight refrigerant flow path.
  • the refrigeration appliance (not shown) according to the present invention has a refrigeration circuit which includes a reciprocating hermetic compressor (1) as described in any one of the above embodiments.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Compressor (AREA)

Description

  • The present invention relates to a reciprocating compressor for use in refrigeration appliance such as a domestic refrigerator, and particularly to a coupling suitable for hermetically joining an exhaust tube directly to a cylinder head of the reciprocating compressor.
  • A refrigeration appliance such as a domestic refrigerator typically utilizes a reciprocating compressor to convey the refrigerant from an evaporator to a condenser. The reciprocating compressor, e.g. as disclosed in US 5,205,719 (A ), generally comprises a compression chamber, a suction chamber, and an exhaust chamber. The suction chamber is located on a downstream side of the evaporator whereas the exhaust chamber is located on an upstream side of the condenser. The compression chamber is formed within the cylinder block. The suction chamber and the exhaust chamber are separately formed within the cylinder head. A valve plate is interposed between the cylinder block and the cylinder head. By virtue of the valve plate, the compression chamber is selectively brought into fluid connection with the suction chamber and the exhaust chamber. The valve plate generally comprises an intake port and exhaust port. The intake port and exhaust port are typically configured by diaphragm check valves which allow the refrigerant to flow only in a single direction. The intake port fluidly connects the suction chamber with the compression chamber upon suction of a piston located in the compression chamber. The exhaust port fluidly connects the compression chamber with the exhaust chamber upon compression of the piston.
  • The reciprocating movement of the piston induces pressure waves in the refrigerant, which have a detrimental effect on the components of the compressor. Therefore, the refrigerant in the exhaust chamber is initially guided through an exhaust passage to an exhaust silencer for attenuating the pressure pulsation of the refrigerant, prior to returning the same to the refrigeration circuit of the refrigeration appliance. However, the temperature of the refrigerant in the exhaust chamber is considerably higher than the temperature of the refrigerant in the suction chamber due to the compression effectuated to the refrigerant by the piston. Consequently, the excess heat of the refrigerant in the exhaust passage is partly released to the other components of the compressor such as the compression chamber, the suction chamber, a motor and the like which are in the vicinity of the exhaust passage. Hence, an overall efficiency of the compressor decreases. Therefore, heat transfer from the exhaust refrigerant to the aforementioned critical components of the compressor must be reduced.
  • US 5,288,212 (A ) discloses a hermetic reciprocating compressor which includes an exhaust chamber and a suction chamber wherein the cover walls of the exhaust chamber and a suction chamber are spaced apart from each other by a predetermined clearance. In addition, a thermal insulation plate is installed in the suction chamber.
  • The technical measures implemented in the above prior art arrangement, increase a size of the hermetic reciprocating compressor, and incur additional costs. This is, however, not desired.
  • An objective of the present invention is to provide a reciprocating compressor, and a refrigeration appliance having the same, which overcomes the aforementioned problems, and effectively reduces heat transfer from the exhaust refrigerant to the critical components of the compressor.
  • This objective has been achieved by the reciprocating compressor according to the present invention as defined in claim 1, and the refrigeration appliance according to the present invention as defined in claim 11. Further achievements have been attained by the subject-matters respectively defined in the dependent claims.
  • In the reciprocating compressor according to the present invention, the exhaust silencer for attenuating pressure pulsation of refrigerant received from the exhaust chamber is separately provided from the cylinder head. The reciprocating compressor according to the present invention further comprises a metal exhaust tube for guiding the refrigerant from the exhaust chamber to the exhaust silencer; and a metal coupling for fluidly connecting an interior of the exhaust chamber with the exhaust tube. The coupling according to the present invention includes: a metal body penetrating throughout a through hole formed in a wall portion of the cylinder head; a hollow part being formed in the metal body, defining a refrigerant flow path from the exhaust chamber to the exhaust tube; a first fixing part integrally provided with the metal body, threadably securing the body to the cylinder head; and a second fixing part integrally provided with the metal body, for gas-tightly joining, an opening of the exhaust tube to the hollow part by a welding joint. Thereby, the refrigerant in the exhaust chamber is just guided away from the compressor main body, and directly fed into the remote exhaust silencer.
  • In an embodiment, the coupling is provided in form of a metal bolt, preferably made of steel. The bolt has a threaded shaft which is threadably engaged with an internal thread of the through hole formed into the wall portion of cylinder head. The shaft has a through bore along its axis which serves as the refrigerant flow path. The shaft partly projects out of the cylinder head. The exhaust tube is joined, by welding to a tip end of the shaft projecting out of the cylinder head. An opening of the exhaust tube is in fluid communication with an opening of the through bore of the shaft. The bolt has a head which secures the shaft to the through hole in the wall portion of the cylinder head. The bolt is firmly screwed into the wall portion. Thereby, the coupling of the present invention enables a direct fluid connection between the exhaust chamber and the exhaust silencer. In addition, the coupling of the present invention can be easily mounted to the cylinder head.
  • In another embodiment, the bolt is alternatively fastened to the wall portion of the exhaust chamber by a nut screwed onto the threaded shaft projecting out of the cylinder head. In this embodiment, it is has been dispensed with to form an internal thread into the wall portion enclosing the through hole.
  • In another embodiment, the inner diameter of the through bore is substantially constant along the shaft and matches with an inner diameter of the exhaust tube. Thereby, uniform flow impedance is attained. A pressure drop in the exhaust refrigerant flow is prevented and an efficient operation of the compressor is safeguarded.
  • In another embodiment, the cylinder head is made of aluminum. The aluminum cylinder head has improved corrosion resistance. In this embodiment both the exhaust tube and the coupling are made of steel. Thereby, the exhaust tube can be joined to the coupling by welding. Such welding joint is robust and also reliable in view of gas-tightness.
  • Additional advantages of the reciprocating compressor according to the present invention will now become apparent with the detailed description of the embodiments with reference to the accompanying drawings in which:
    • Figure 1 - is a schematic cross sectional side view, taken along a vertical line, of a reciprocating hermetic compressor according to an embodiment of the present invention.
    • Figure 2 - is a schematic enlarged partial perspective view of the cylinder block shown in Fig. 1.
    • Figure 3 - is a schematic enlarged partial front view of the cylinder block shown in Fig. 1.
    • Figure 4 - is schematic enlarged top view of a coupling according to an embodiment of the present invention.
    • Figure 5 - is schematic cross sectional view, taken along the line A-A, of the coupling shown in Fig. 4.
    • Figure 6 - is a schematic perspective top view of the cylinder head shown in Figs. 2 and 3, prior to mounting the coupling shown in Figs. 4 and 5.
    • Figure 7 - is a schematic perspective bottom view of the cylinder head shown in Figs. 2 and 3, prior to mounting the coupling shown in Figs. 4 and 5.
    • Figure 8 - is a schematic partial perspective bottom view of the cylinder head, the coupling and the exhaust tube shown in Figs. 2 and 3.
    • Figure 9 - is a schematic enlarged partial perspective view of a cylinder block according to another embodiment of the present invention.
    • Figure 10 - is a schematic enlarged partial front view of the cylinder block shown in Fig. 9.
    • Figure 11 - is a schematic perspective top view of the cylinder head shown in Figs. 9 and 10, prior to mounting the coupling shown in Figs. 4 and 5 and a nut.
    • Figure 12 - is a schematic perspective bottom view the cylinder head shown in Figs. 9 and 10, prior to mounting the coupling shown in Figs. 4 and 5 and a nut.
    • Figure 13 - is a schematic partial perspective bottom view the cylinder head, the coupling, the nut, and the exhaust tube shown in Figs. 9 and 10.
  • The reference signs appearing on the drawings relate to the following technical features.
    • 1.
    Reciprocating hermetic compressor
    2.
    Cylinder block
    3.
    Compression chamber
    4.
    Cylinder head
    5.
    Suction chamber
    6.
    Exhaust chamber
    7.
    Valve plate
    8.
    Exhaust tube
    9.
    Coupling
    10.
    Through hole
    11.
    Wall portion
    12.
    Shaft
    13.
    Through bore
    14.
    Head
    15.
    First thread
    16.
    Second thread
    17.
    Nut
    18.
    Flange
  • The reciprocating hermetic compressor (1) is suitable for use in a refrigeration appliance, in particular a domestic refrigerator (not shown) comprises a cylinder block (2) having a compression chamber (3), a cylinder head (4) having a suction chamber (5) and separately therefrom, an exhaust chamber (6), each being in fluid connection with the compression chamber (3) through a valve plate (7) interposed between the cylinder block (2) and the cylinder head (4) an exhaust silencer, separately provided from the cylinder head (4) for attenuating pressure pulsation of refrigerant received from the exhaust chamber (6) (Fig. 1).
  • The reciprocating hermetic compressor (1) according to the present invention further comprises a metal exhaust tube (8) for guiding the refrigerant in the exhaust chamber (6) to the exhaust silencer (not shown), a metal coupling (9) for fluidly connecting an interior of the exhaust chamber (6) with the exhaust tube (8), said coupling (9) including a metal body penetrating throughout a through hole (10) formed in a wall portion (11) of the cylinder head (4), a hollow part formed in the metal body, defining a refrigerant flow path from the exhaust chamber (6) to the exhaust tube (8), a first fixing part integrally provided with the metal body, threadably securing the body to the cylinder head (4) and a second fixing part integrally provided with the metal body, gas-tightly joining, an opening of the exhaust chamber (6) to the hollow part by a welding joint (Figs. 2 and 3; Figs. 9 and 10).
  • In an embodiment of the present invention, the coupling (9) is manufactured as a metal bolt, preferably made from steel (Figs. 4 and 5). The bolt includes a shaft (12) which penetrates throughout said through hole (10) (Figs. 2, 3, 5, and 8). A through bore (13) is formed along the shaft (12), which configures the hollow part (Fig. 5). The bolt further includes a head (14) which abuts against an inner wall portion (11) of the cylinder head (4), surrounding the through hole (10) (Figs. 5 and 8). The bolt further includes a first thread (15) which is formed on the shaft (12) for threadably engaging with a second thread (16) which is formed inside said through hole (10) of the cylinder head (4) (Figs. 5 to 7). In this embodiment, the head (14) and the first tread (15) configure the first fixing part. A tip end of the shaft (12) projects out of the through hole (10) (Figs. 2, 3, and 8). In this embodiment, a tip end of the shaft (12) configures the second fixing part. The exhaust tube (8) is welded to said tip end of the shaft (15) (Figs. 2, 3, and 8)
  • In another embodiment of the present invention, the first thread (15) is formed just behind the head (14) of the bolt to oppose said second thread (16) when the head (14) abuts against the inner wall portion (11) (Fig. 5 to 7). Thereby, a tight engagement between the wall portion (11) and the bolt is attained.
  • In an alternative embodiment of the present invention, a second thread (16) has not been formed inside the through hole (10) of the cylinder head (4) (Figs. 11 and 12). Instead, a nut (17) is used for fastening the bolt (Fig. 13). In this embodiment of the present invention, the coupling (9) is also provided in form of a metal bolt (Figs. 4 and 5). The bolt includes a shaft (12) which penetrates throughout said through hole (10) in the cylinder head (4) (Figs. 9, 10, and 13).
  • A through bore (13) is formed along the shaft (12), which configures the hollow part (Fig. 5). The bolt further includes a head (14) which abuts against an inner wall portion (11) of the cylinder head (4), surrounding the through hole (10) (Figs. 5 and 13). The bolt further includes a first thread (15) formed on the shaft (12), which receives a nut (17) that abuts against an outer wall portion (11) of the cylinder head (4), surrounding the through hole (10) (Figs. 5, 9 to 13). In this embodiment, the head (14), the first tread (15), and the nut (17) configure the first fixing part. A tip end of the shaft (12) projects out of the through hole (10) (Figs. 9, 10, and 13). In this embodiment, said tip end of the shaft (12) configures the second fixing part. The exhaust tube (8) is welded to said tip end of the shaft (12) (Figs. 9, 10, and 13).
  • In another embodiment of the present invention, the first thread (15) is formed on a portion of the shaft (12) which projects out of the through hole (10) (Figs. 9, 10, and 13). Thereby, the nut (17) can be tightly screwed onto the shaft (12).
  • In another embodiment of the present invention, an inner diameter of the through bore (16) is constant along the shaft (12) and matches with an inner diameter of the exhaust tube (8) (Fig. 5, 8 and 13).
  • In another embodiment of the present invention, the head (14) has a flange (18) (Fig.5). The flange (18) abuts against an inner wall portion (11) of the cylinder head (4) which surrounds the through hole (10) (Figs. 8 and 13).
  • In alternative embodiment of the present invention, the bolt is not provided with a flange (18). In this embodiment, alternatively a washer (not shown) is used. The washer is placed between the head (14) and an inner wall portion (11) of the cylinder head (4), which surrounds the through hole (10).
  • In another embodiment of the present invention, the cylinder head (4) is made of aluminum.
  • In another embodiment of the present invention, both the exhaust tube (8) and the coupling (9) are made of steel. Thereby, the exhaust tube (8) and the coupling (9) can be welded to establish a gas-tight refrigerant flow path.
  • The refrigeration appliance (not shown) according to the present invention has a refrigeration circuit which includes a reciprocating hermetic compressor (1) as described in any one of the above embodiments.

Claims (11)

  1. A reciprocating hermetic compressor (1) for use in a refrigeration appliance, in particular a domestic refrigerator, comprising a cylinder block (2) having a compression chamber (3), a cylinder head (4) having a suction chamber (5) and separately therefrom, an exhaust chamber (6), each being in fluid connection with the compression chamber (3) through a valve plate (7) interposed between the cylinder block (2) and the cylinder head (4) and an exhaust silencer, separately provided from the cylinder head (4), for attenuating pressure pulsation of a refrigerant received from the exhaust chamber (6), characterized in that
    - a metal exhaust tube (8) for guiding the refrigerant in the exhaust chamber (6) to the exhaust silencer
    - a metal coupling (9) for fluidly connecting the exhaust chamber (6) with the metal exhaust tube (8), said coupling (9) comprising:
    - a metal body penetrating throughout a through hole (10) formed in a wall portion (11) of the cylinder head (4),
    - a hollow part formed in the metal body, defining a refrigerant flow path from the exhaust chamber (6) to the exhaust tube (8),
    - a first fixing part integrally provided with the body, threadably securing the body to the cylinder head (4) and
    - a second fixing part integrally provided with the body, gas-tightly joining, an opening of the exhaust tube (6) to the hollow part by a welding joint.
  2. The reciprocating hermetic compressor (1) according to claim 1, characterized in that
    the coupling (9) is manufactured as a metal bolt, wherein the coupling (9) comprising:
    - a shaft (12) penetrating throughout said through hole (10), wherein the shaft (12) configures said metal body,
    - a through bore (13) formed along the shaft (12), wherein the through bore (13) configures said hollow part,
    - a head (14) abutting against an inner wall portion (11) of the cylinder head (4), surrounding the through hole (10),
    - a first thread (15) formed on the shaft (12), threadably engaging with a second thread (16) formed inside said through hole (10) of the cylinder head (4), wherein the head (14) and the first tread (15) configure the first fixing part and
    - a tip end of the shaft (12) projecting out of the through hole (10), gas tightly joining the exhaust tube (8) to said tip end of the shaft (12) by the welding joint, wherein said tip end of the shaft (12) configures the second fixing part.
  3. The reciprocating hermetic compressor (1) according to claim 2, characterized in that the first thread (15) is formed at a portion of the shaft (12) just behind the head (14) of the bolt.
  4. The reciprocating hermetic compressor (1) according to claim 1, characterized in that the coupling (9) is manufactured as a metal bolt, wherein the coupling (9) comprising:
    - a shaft (12) penetrating throughout said through hole (10), wherein the shaft (12) configures said metal body,
    - a through bore (13) formed along the shaft (12), wherein the through bore (13) configures the hollow part,
    - a head (14) abutting against an inner wall portion (11) of the cylinder head (4), surrounding the through hole (10),
    - a first thread (15) formed on the shaft (12), threadably engaging with a nut (17) abutting against an outer wall portion (11) of the cylinder head (4), surrounding the through hole (10), wherein the head (14), the first tread (15), and the nut (17) configure the first fixing part and
    - a tip end of the shaft (12) projecting out of the through hole (10), gas-tightly joining the exhaust tube (8) to said tip end of the shaft (12) by the welding joint, wherein said tip end of the shaft (12) configures the second fixing part.
  5. The reciprocating hermetic compressor (1) according to claim 4, characterized in that the first thread (15) is formed on a portion of the shaft (12) projecting out of the through hole (10).
  6. The reciprocating hermetic compressor (1) according to any one of claims 2 to 5, characterized in that the inner diameter of the through bore (16) is constant along the shaft (12) and matches with the inner diameter of the exhaust tube (8).
  7. The reciprocating hermetic compressor (1) according to any one of claims 2 to 6, characterized in that the head (14) has a flange (18) abutting against the inner wall portion (11) of the cylinder head (4), surrounding the through hole (10).
  8. The reciprocating hermetic compressor (1) according to any one of claims 2 to 6, characterized in that the coupling (9) includes a washer placed between the head (14) and the inner wall portion (11) of the cylinder head (4), surrounding the through hole (10).
  9. The reciprocating hermetic compressor (1) according to any one of claims 1 to 8, characterized in that the cylinder head (4) is made of aluminum.
  10. The reciprocating hermetic compressor (1) according to any one of claims 1 to 9, characterized in that both the exhaust tube (8) and the coupling (9) are made of steel.
  11. A refrigeration appliance, in particular a domestic refrigerator, comprising a refrigeration circuit for circulating a refrigerant, which includes the reciprocating hermetic compressor (1) as defined in any one of the preceding claims 1 to 10.
EP13735006.2A 2013-07-04 2013-07-04 Thermally improved reciprocating hermetic compressor Active EP3017194B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
SI201330630A SI3017194T1 (en) 2013-07-04 2013-07-04 Thermally improved reciprocating hermetic compressor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP2013/064205 WO2015000523A1 (en) 2013-07-04 2013-07-04 Thermally improved reciprocating hermetic compressor

Publications (2)

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EP3017194A1 EP3017194A1 (en) 2016-05-11
EP3017194B1 true EP3017194B1 (en) 2017-02-08

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP13735006.2A Active EP3017194B1 (en) 2013-07-04 2013-07-04 Thermally improved reciprocating hermetic compressor

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EP (1) EP3017194B1 (en)
ES (1) ES2623063T3 (en)
SI (1) SI3017194T1 (en)
WO (1) WO2015000523A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3617515A4 (en) * 2018-06-29 2020-08-12 Anhui Meizhi Compressor Co., Ltd. Cylinder head of piston type compressor and piston type compressor

Families Citing this family (2)

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Publication number Priority date Publication date Assignee Title
CN110645165B (en) * 2019-09-23 2021-05-25 广州万宝集团压缩机有限公司 Cylinder head assembly, compressor and refrigerating device
EP4194695B1 (en) * 2021-12-07 2024-06-26 Arçelik Anonim Sirketi A hermetic compressor with improved vibration tube assembly

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JPS5395730A (en) * 1977-02-01 1978-08-22 Toshiba Corp Golf training machine
JPS60111074A (en) * 1983-11-18 1985-06-17 Toshiba Corp Reciprocating compressor
US5205719A (en) * 1992-01-13 1993-04-27 Copeland Corporation Refrigerant compressor discharge muffler
KR20020045741A (en) * 2000-12-11 2002-06-20 윤종용 Compressor with discharge muffler
EP2616681A1 (en) * 2010-09-14 2013-07-24 Arçelik Anonim Sirketi A compressor comprising a body with reduced heat transmission

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3617515A4 (en) * 2018-06-29 2020-08-12 Anhui Meizhi Compressor Co., Ltd. Cylinder head of piston type compressor and piston type compressor

Also Published As

Publication number Publication date
WO2015000523A1 (en) 2015-01-08
ES2623063T3 (en) 2017-07-10
EP3017194A1 (en) 2016-05-11
SI3017194T1 (en) 2017-06-30

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