US20150369526A1 - Sealed compressor and refrigeration device - Google Patents
Sealed compressor and refrigeration device Download PDFInfo
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- US20150369526A1 US20150369526A1 US14/766,033 US201414766033A US2015369526A1 US 20150369526 A1 US20150369526 A1 US 20150369526A1 US 201414766033 A US201414766033 A US 201414766033A US 2015369526 A1 US2015369526 A1 US 2015369526A1
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- space
- communication pipe
- exit section
- sealed
- cylinder
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B31/00—Compressor arrangements
- F25B31/02—Compressor arrangements of motor-compressor units
- F25B31/023—Compressor arrangements of motor-compressor units with compressor of reciprocating-piston type
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- 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
- F04B35/00—Piston pumps specially adapted for elastic fluids and characterised by the driving means to their working members, or by combination with, or adaptation to, specific driving engines or motors, not otherwise provided for
- F04B35/04—Piston pumps specially adapted for elastic fluids and characterised by the driving means to their working members, or by combination with, or adaptation to, specific driving engines or motors, not otherwise provided for the means being electric
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- 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
- F04B37/00—Pumps having pertinent characteristics not provided for in, or of interest apart from, groups F04B25/00 - F04B35/00
- F04B37/10—Pumps having pertinent characteristics not provided for in, or of interest apart from, groups F04B25/00 - F04B35/00 for special use
-
- 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
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- 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
- F04B39/0066—Pulsation and noise damping means with a special shape of fluid passage, e.g. bends, throttles, diameter changes, pipes using sidebranch resonators, e.g. Helmholtz resonators
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- 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
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- 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
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- 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
- F04B39/06—Cooling; Heating; Prevention of freezing
- F04B39/062—Cooling by injecting a liquid in the gas to be compressed
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- 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
- F04B39/121—Casings
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- 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
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- 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
- F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
- F04B53/10—Valves; Arrangement of valves
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- 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
- F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
- F04B53/14—Pistons, piston-rods or piston-rod 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
- F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
- F04B53/16—Casings; Cylinders; Cylinder liners or heads; Fluid connections
Definitions
- the piston 132 inserted into the cylinder 133 is coupled to the coupling section 136 .
- the piston 132 is placed such that its axis crosses the axial direction of the crankshaft 140 .
- the crankshaft 140 is placed such that its center axis extends in the longitudinal direction
- the piston 132 is placed such that its center axis extends in the lateral direction. Therefore, the axial direction of the piston 132 is perpendicular to the axial direction of the crankshaft 140 .
- the coupling section 136 is coupled to the piston 132 and to the eccentric shaft 141 of the crankshaft 140 .
- the coupling section 136 transmits the rotational motion of the crankshaft 140 rotated by the electric component 120 to the piston 132 , and thereby the piston 132 reciprocates in the interior of the cylinder 133 .
- a muffling space 163 a of the suction muffler 160 is formed by the muffler body 163 .
- the tail pipe 161 is in communication with the internal space of the sealed container 101 , and serves to guide the refrigerant gas to the interior of the muffler body 163 .
- the communication pipe 162 is located at the upper side of the muffler body 163 .
- the communication pipe 162 is in communication with the compression chamber 134 via the suction hole 151 a of the valve plate 151 .
- the communication pipe 162 guides the refrigerant gas from the interior of the muffler body 163 to the interior of the compression chamber 134 .
- the refrigeration device 200 of the present embodiment incorporates the sealed compressor 100 of Embodiment 1.
- the sealed compressor 100 since the sealed compressor 100 includes the gas inflow space 152 b in the interior of the sealed container, a decrease in the volumetric efficiency can be suppressed effectively by suppressing a temperature increase in the refrigerant gas.
- the efficiency of the sealed compressor 100 is high.
- electric consumption in the refrigeration device 200 can be reduced, and hence energy saving can be realized.
Abstract
Description
- The present invention relates to a sealed compressor for use in a refrigeration cycle of refrigeration devices or the like, and a refrigeration device using the sealed compressor.
- Refrigeration devices including refrigeration cycles are widely used for household purposes or business purposes, as home electric freezers/refrigerators, or show cases. In recent years, there has been an increasing demand for global environment conservation. Under the circumstances, there has been a strong demand for the high efficiency of a sealed compressor used in the refrigeration cycle.
- Conventionally, as an example of a technique for preventing a decrease in the compression efficiency of the sealed compressor, an air compressor disclosed in
Patent Literature 1 is known. This air compressor is configured such that a cylinder head is provided with a discharge chamber and a suction chamber, and a peripheral wall defining the discharge chamber and a peripheral wall defining the suction chamber are separated from each other by a cooling groove. - Specifically, as shown in
FIG. 7 , the air compressor disclosed inPatent Literature 1 includes apiston 512, acylinder 513, avalve seat plate 514, acylinder head 518, asuction valve 529, adischarge valve 531, etc. - The
piston 512 reciprocates inside of thecylinder 513. The end surface of thecylinder 513 is provided with thevalve seat plate 514. Thevalve seat plate 514 includes asuction port 528 and a discharge port (not shown) and is provided with asuction valve 529 and adischarge valve 531. Thesuction port 528 is opened and closed by thesuction valve 529, while the discharge port is opened and closed by thedischarge valve 531. Acylinder head 518 is provided above thevalve seat plate 514. Thecylinder head 518 includes asuction chamber 515 which is in communication with thesuction port 528 and adischarge chamber 516 which is in communication with the discharge port. - The
cylinder head 518 is formed by a single member and fastened to thecylinder 513 together with thevalve seat plate 514. Thesuction chamber 515 defined by aperipheral wall 525 is provided at one side of thecylinder head 518. Thedischarge chamber 516 surrounds theperipheral wall 525 defining thesuction chamber 515, and is defined by aperipheral wall 517 extending over the entire upper surface of thecylinder head 518. Between theperipheral wall 525 and theperipheral wall 517, acooling groove 526 with a large depth is formed. -
- Patent Literature 1: Japanese Patent No. 2688809
- However, in the above-described configuration, since the
cylinder head 518 is formed by the single member, theperipheral wall 525 defining thesuction chamber 515 and theperipheral wall 517 defining thedischarge chamber 516 are in communication with each other, even though thecooling groove 526 is formed. For this reason, when theperipheral wall 517 is heated by a high-temperature refrigerant gas in the interior of thedischarge chamber 516, this heat is transferred from theperipheral wall 517 to theperipheral wall 525, which increases the temperature of theperipheral wall 525. The refrigerant gas suctioned into thesuction chamber 515 is also heated. As a result, volumetric efficiency is reduced. - The
valve seat plate 514 is provided with thesuction port 528. Thevalve seat plate 514 is also heated by the refrigerant gas in the interior of thedischarge chamber 516 and the compressed refrigerant gas in the interior of thecylinder 513. Since the suctioned refrigerant gas is also heated by the heat of thevalve seat plate 514, the volumetric efficiency is reduced as in the above case. - The present invention has been made to solve the above described problem, and an object of the present invention is to provide a sealed compressor with high efficiency which is capable of suppressing a temperature increase in a suctioned refrigerant gas to thereby effectively suppress a decrease in volumetric efficiency.
- To solve the above described problem, the present invention provides a sealed compressor comprising: a sealed container having a sealed space inside thereof; an electric component accommodated in the sealed container; and a compression component accommodated in the sealed container and driven by the electric component to compress a refrigerant gas, wherein the compression component includes: a crankshaft supported such that an axis of the crankshaft extends vertically, the crankshaft being rotated by the electric component; a piston which is provided such that an axis of the piston crosses an axial direction of the crankshaft and is reciprocatable according to a rotation of the crankshaft; a cylinder having a compression chamber inside thereof, the piston being reciprocatably inserted into the cylinder through one end of the cylinder; a valve plate which closes the other end of the cylinder and is provided with a suction hole and a discharge hole; a cylinder head which is fastened to the other end of the cylinder via the valve plate and has a discharge space inside thereof which is in communication with the discharge hole; and a suction muffler which is located below the cylinder, has a muffling space inside thereof, and includes a communication pipe coupled to the suction hole, wherein the communication pipe extends upward from the suction muffler toward the other end of the cylinder and includes a communication pipe exit section at an upper end of the communication pipe such that the communication pipe exit section is in communication with the suction hole, wherein a recess accommodating the communication pipe exit section inside thereof is provided on a lower portion of the cylinder head, and wherein a gas inflow space in an interior of the sealed container is formed between the communication pipe exit section and the recess and is in communication with the sealed space.
- The present invention provides a refrigeration device comprising a refrigeration circuit configured such that the sealed compressor having the above configuration, a heat radiator, a pressure-reducing device, and a heat absorbing unit are annularly coupled to each other by use of a pipe.
- The above and further objects, features and advantages of the present invention will more fully be apparent from the following detailed description of preferred embodiments with accompanying drawings.
- With the above described configuration, the present invention has an advantage that it is possible to provide a sealed compressor with high efficiency which is capable of suppressing a temperature increase in a suctioned refrigerant gas to effectively suppress a decrease in volumetric efficiency.
-
FIG. 1 is a schematic longitudinal sectional view showing a typical example of a sealed compressor according toEmbodiment 1 of the present invention. -
FIG. 2 is a schematic longitudinal sectional view showing in an enlarged manner the structure surrounded by a dotted line A, in the sealed compressor ofFIG. 1 . -
FIG. 3 is a schematic longitudinal sectional view showing the more specific configuration of a cylinder head ofFIG. 2 . -
FIG. 4 is a schematic plan view showing a state in which the configuration of a cylinder head and the configuration of the exit section of a suction muffler, in the sealed compressor ofFIG. 1 , when viewed from a block arrow B. -
FIG. 5 is a schematic cross-sectional view showing the modified example of the structure surrounded by the dotted line A, in the sealed compressor ofFIG. 1 . -
FIG. 6 is a schematic view showing the basis configuration of a refrigeration device according toEmbodiment 2 of the present invention. -
FIG. 7 is a longitudinal sectional view showing the exemplary configuration of a region in the vicinity of a cylinder head of a conventional air compressor. - The present invention provides a sealed compressor comprising: a sealed container having a sealed space inside thereof; an electric component accommodated in the sealed container; and a compression component accommodated in the sealed container and driven by the electric component to compress a refrigerant gas, wherein the compression component includes: a crankshaft supported such that an axis of the crankshaft extends vertically, the crankshaft being rotated by the electric component; a piston which is provided such that an axis of the piston crosses an axial direction of the crankshaft and is reciprocatable according to a rotation of the crankshaft; a cylinder having a compression chamber inside thereof, the piston being reciprocatably inserted into the cylinder through one end of the cylinder; a valve plate which closes the other end of the cylinder and is provided with a suction hole and a discharge hole; a cylinder head which is fastened to the other end of the cylinder via the valve plate and has a discharge space inside thereof which is in communication with the discharge hole; and a suction muffler which is located below the cylinder, has a muffling space inside thereof, and includes a communication pipe coupled to the suction hole, wherein the communication pipe extends upward from the suction muffler toward the other end of the cylinder and includes a communication pipe exit section at an upper end of the communication pipe such that the communication pipe exit section is in communication with the suction hole, wherein a recess accommodating the communication pipe exit section inside thereof is provided on a lower portion of the cylinder head, and wherein a gas inflow space in an interior of the sealed container is formed between the communication pipe exit section and the recess and is in communication with the sealed space.
- In accordance with this configuration, the heat insulating layer which is the gas inflow space in the interior of the sealed container is formed between the communication pipe exit section and the cylinder head. In this structure, it becomes possible to suppress heat transfer from the high-temperature cylinder head to the communication pipe exit section. Because of this, it becomes possible to suppress a temperature increase in the suctioned refrigerant gas flowing through the communication pipe, and to effectively suppress a decrease in the volumetric efficiency of the refrigerant gas. As a result, the efficiency of the sealed compressor can be improved.
- In the sealed compressor configured as described above, when the axial direction of the crankshaft is a longitudinal direction and an axial direction of the piston is a lateral direction, the gas inflow space in the interior of the sealed container may include a first space located below the discharge space and extending in the lateral direction to face an upper peripheral surface of the communication pipe exit section, and a second space extending in the longitudinal direction to face a side peripheral surface of the communication pipe exit section, and the first space may have a thickness larger than a thickness of the second space.
- In accordance with this configuration, the first space is located in the cylinder head upper section of the cylinder head, including the discharge space, while the second space is located in the cylinder head lower section of the cylinder head. The interior of the discharge space is in a higher-temperature state than the sealed space inside of the sealed container is. In view of this, by setting the thickness of the first space larger than the thickness of the second space, the heat transfer from the discharge space with a large heat amount to the refrigerant gas flowing through the communication pipe can be suppressed. Thus, a temperature increase in the refrigerant gas flowing through the communication pipe can be suppressed more effectively.
- In the sealed compressor configured as described above, the communication pipe exit section may have an opening section at a tip end, the opening section being inserted into the suction hole.
- In accordance with this configuration, since the opening section is inserted into the suction hole, the refrigerant gas flowing through the communication pipe exit section is suctioned into the compression chamber through the opening section without contacting the valve plate in a high-temperature state. Thus, the gas inflow space in the interior of the sealed container makes it possible to suppress a temperature increase in the refrigerant gas due to the heat transfer from the valve plate as well as a temperature increase in the refrigerant gas.
- In the sealed compressor configured as described above, the cylinder head may be formed with a hollow space on a projection plane formed by projecting the suction hole in the lateral direction to the lower portion of the cylinder head.
- In accordance with this configuration, between the cylinder head and the communication pipe exit section, a space defined by the hollow space as well as the gas inflow space in the interior of the sealed container is formed. This makes it possible to further suppress the heat transfer from the cylinder head in a high-temperature state to the communication pipe exit section.
- In the sealed compressor configured as described above, the communication pipe exit section may be provided with a heat insulating space isolated from the sealed space, on an outer periphery facing the valve plate, and a communication hole which provides communication between the heat insulating space and an interior of the communication pipe exit section.
- In accordance with this configuration, the heat insulating space into which the refrigerant gas is introduced is formed between the communication pipe exit section and the valve plate. This makes it possible to keep the temperature of the heat insulating space at a value which is substantially equal to that of the refrigerant gas. In this way, the heat transfer from the valve plate to the communication pipe exit section can be further suppressed.
- In the sealed compressor configured as described above, the suction muffler may be molded by use of a resin, and the heat insulating space may be formed integrally with the suction muffler, when the suction muffler is molded.
- In accordance with this configuration, the heat insulating space is formed integrally as a part of the shape of the communication pipe when the suction muffler is molded by use of a resin. This allows the heat insulating space to more effectively perform heat insulation.
- The sealed compressor may be configured to be driven at one of a plurality of operating frequencies.
- In accordance with this configuration, since the gas inflow space in the interior of the sealed container can suppress the heat transfer to the communication pipe exit section, a temperature increase in the refrigerant gas flowing through the communication pipe can be suppressed effectively, even when the refrigerant gas is flowing through the communication pipe at a low velocity. Therefore, even in the case of using the operating frequency at which the sealed compressor is inverter-driven by a low-speed rotation in which the flow velocity of the refrigerant gas is low, the efficiency of the sealed compressor can be improved.
- The present invention also provides a refrigeration device comprising a refrigeration circuit configured such that the sealed compressor having the above configuration, a heat radiator, a pressure-reducing device, and a heat absorbing unit are annularly coupled to each other by use of a pipe.
- In accordance with this configuration, since the refrigeration device includes the refrigeration circuit incorporating the sealed compressor having the above configuration, the refrigeration device is able to reduce electric power consumption and realize energy saving.
- Hereinafter, the preferred embodiment of the present invention will be described with reference to the drawings. Throughout the drawings, the same or corresponding components are identified by the same reference symbols, and will not be described repeatedly.
- [Exemplary Configuration of Sealed Compressor]
- Initially, the exemplary configuration of the sealed compressor according to the present embodiment will be described with reference to
FIGS. 1 to 4 . - As shown in
FIG. 1 , a sealedcompressor 100 according to the present embodiment includes anelectric component 120 and acompression component 130 which are accommodated in a sealedcontainer 101, and the sealedcontainer 101 is filled with, for example, a refrigerant gas and lubricatingoil 103. Theelectric component 120 and thecompression component 130 constitute a compressor body. The compressor body is placed inside of the sealedcontainer 101 such that the compressor body is elastically supported by asuspension spring 102 provided in the bottom portion of the sealedcontainer 101. - The sealed
container 101 is provided with asuction pipe 104 and adischarge pipe 105. One end of thesuction pipe 104 is in communication with the inner space of the sealedcontainer 101, while the other end thereof is connected to a refrigeration device which is not shown, thus constituting a refrigeration cycle. One end of thedischarge pipe 105 is connected to thecompression component 130, while the other end thereof is connected to a refrigeration device which is not shown. As will be described later, the refrigerant gas compressed by thecompression component 130 is guided to the refrigeration cycle through thedischarge pipe 105, and the refrigerant gas from the refrigeration cycle is guided to the inner space of the sealedcontainer 101 via thesuction pipe 104. - The specific configuration of the sealed
container 101 is not particularly limited. In the present embodiment, for example, the sealedcontainer 101 is manufactured by a drawing process of an iron plate. The refrigerant gas is filled in the sealedcontainer 101 under a pressure equal to a pressure at a lower-pressure side in the refrigeration cycle into which the sealedcompressor 100 is incorporated, and at a relatively low temperature. The lubricatingoil 103 is filled to lubricate a crankshaft 140 (which will be described later) included in thecompression component 130. As shown inFIG. 1 , the lubricatingoil 103 is reserved in the bottom portion of the sealedcontainer 101. - The kind of the refrigerant gas is not particularly limited, and a gas known in the field of the refrigeration cycle is suitably used. In the present embodiment, for example, hydrocarbon-based refrigerant gas such as R600a is suitably used. R600a has a low global warming potential and is one of refrigerant gases favorably used in terms of global environment conservation. In addition, the kind of the lubricating
oil 103 is not particularly limited, and lubricating oil known in the fields of the compressor may be suitably used. - As shown in
FIG. 1 , theelectric component 120 includes at least astator 121 and arotor 122. Thestator 121 is fastened to the lower side of a cylinder block 131 (which will be described later) included in thecompression component 130 by use of a fastening member such as a bolt. Therotor 122 is placed coaxially with thestator 121 in a location inward of thestator 121. Amain shaft 142 of a crankshaft 140 (which will be described later) included in thecompression component 130, is fastened to therotor 122, by, for example, shrink-fitting. Theelectric component 120 is connected to an external inverter driving circuit (not shown) and inverter-driven at one of a plurality of frequencies. - The
compression component 130 is driven by theelectric component 120 and compresses the refrigerant gas. As shown inFIG. 1 , thecompression component 130 includes acylinder block 131, apiston 132, acylinder 133, acompression chamber 134, abearing section 135, acoupling section 136, acrankshaft 140, avalve plate 151, acylinder head 152, asuction valve 153, asuction muffler 160, and others. - The
cylinder block 131 is provided with thecylinder 133 and thebearing section 135. When a vertical direction is a longitudinal direction and a horizontal direction is a lateral direction, in a state in which the sealedcompressor 100 is placed on a horizontal plane, thecylinder 133 is placed along the lateral direction and fastened to thebearing section 135 in the interior of the sealedcontainer 101. Thecylinder 133 is formed with a bore of a substantially cylindrical shape with a diameter substantially equal to that of thepiston 132. Thepiston 132 is reciprocatably inserted into thecylinder 133. Thecylinder 133 and thepiston 132 define thecompression chamber 134, and the refrigerant gas is compressed in the interior of thecompression chamber 134. Thebearing section 135 supports themain shaft 142 of thecrankshaft 140 such that themain shaft 142 is rotatable. - The
crankshaft 140 is supported in the interior of the sealedcontainer 101 in such a manner that its axis (axis of the crankshaft 140) extends in the longitudinal direction. Thecrankshaft 140 includes themain shaft 142, aneccentric shaft 141, anoil feeding mechanism 143, and others. As described above, themain shaft 142 is fastened to therotor 122 of theelectric component 120. Theeccentric shaft 141 is configured to be eccentric with respect to themain shaft 142. Theoil feeding mechanism 143 is provided so as to provide communication between the lower end of themain shaft 142 immersed in thelubricating oil 103 and the upper end of theeccentric shaft 141. Theoil feeding mechanism 143 includes an oil feeding pump, a spiral channel formed on the surface of themain shaft 142, etc. Theoil feeding mechanism 143 feeds the lubricatingoil 103 to thecrankshaft 140. - The
piston 132 inserted into thecylinder 133 is coupled to thecoupling section 136. Thepiston 132 is placed such that its axis crosses the axial direction of thecrankshaft 140. In the present embodiment, as shown inFIG. 2 , thecrankshaft 140 is placed such that its center axis extends in the longitudinal direction, while thepiston 132 is placed such that its center axis extends in the lateral direction. Therefore, the axial direction of thepiston 132 is perpendicular to the axial direction of thecrankshaft 140. Thecoupling section 136 is coupled to thepiston 132 and to theeccentric shaft 141 of thecrankshaft 140. Thecoupling section 136 transmits the rotational motion of thecrankshaft 140 rotated by theelectric component 120 to thepiston 132, and thereby thepiston 132 reciprocates in the interior of thecylinder 133. - As described above, the
piston 132 is inserted into one end portion (closer to the crankshaft 140) of thecylinder 133. The other end portion (end portion which is away from the crankshaft 140) of thecylinder 133 is closed by avalve plate 151 and thecylinder head 152. Thecylinder head 152 is fastened together with thevalve plate 151 to thecylinder 133 by use of a fastening member such as a head bolt. Thevalve plate 151 is placed between thecylinder 133 and thecylinder head 152. As shown inFIG. 2 , thevalve plate 151 is formed with asuction hole 151 a and adischarge hole 151 b. - The
cylinder head 152 is divided into a cylinder head upper section 152-1 and a cylinder head lower section 152-2 by a lateral broken line C ofFIGS. 2 , 3, and 4. This broken line C is on the basis of the upper end of agas inflow space 152 b in the interior of the sealed container, which will be described later. The cylinder head upper section 152-1 has a casing shape in which adischarge space 152 a is formed inside thereof. The cylinder head lower section 152-2 is formed with arecess 152 d in which the upper end (communicationpipe exit section 162 a) of acommunication pipe 162 of thesuction muffler 160 can be placed. For easier explanation of the description, therecess 152 d is surrounded by a broken-line area inFIG. 2 , while therecess 152 d is indicated by an arrow inFIGS. 3 and 4 . - Hereinafter, for easier description, the surface (surface closer to the
compression chamber 134 and closer to the cylinder 133) of thecylinder head 152 which contacts thevalve plate 151 will be referred to as a “contact surface 152 p” and a surface which is on an opposite side of thecontact surface 152 p will be referred to as “non-contact surface 152 q”. As shown inFIG. 3 , thedischarge space 152 a of thecylinder head 152 is opened in thecontact surface 152 p and closed by thenon-contact surface 152 q. As shown inFIG. 4 , thecontact surface 152 p is a flat surface positioned in the vicinity of the opening of thedischarge space 152 a. As shown inFIG. 2 , thecontact surface 152 p contacts thevalve plate 151 and thus thedischarge space 152 a is sealingly closed. - As described above, the
contact surface 152 p is the flat surface. Thenon-contact surface 152 q is also present in the cylinder head lower section 152-2. The upper portion of thenon-contact surface 152 q is acurved surface 152 q-1 protruding downward from the upper side ofFIG. 3 . The lower portion of thenon-contact surface 152 q includes a firstflat surface 152 q-2 which is substantially flat and extends vertically downward to be below thedischarge space 152 a and a secondflat surface 152 q-3 which is substantially flat and is located inward relative to the firstflat surface 152 q-2. In brief, as shown inFIG. 3 , thenon-contact surface 152 q includes thecurved surface 152 q-1, the firstflat surface 152 q-2, and the secondflat surface 152 q-3. - The inner surface of the
recess 152 d of the cylinder head lower section 152-2 is a curved surface conforming in shape to the communicationpipe exit section 162 a. In other words, the inner surface of therecess 152 d of the cylinder head lower section 152-2 faces the outer surface of the communicationpipe exit section 162 a. Hereinafter, the surface facing the outer surface of the communicationpipe exit section 162 a will be referred to as “opposed surface 152 r” for easier description. As shown inFIGS. 2 and 4 , thegas inflow space 152 b in the interior of the sealed container, which will be described later, is formed between the communicationpipe exit section 162 a and theopposed surface 152 r. In addition, as shown inFIGS. 2 and 4 , aheat insulating space 162 c which will be described later is formed between thevalve plate 151 and the communicationpipe exit section 162 a. Further, as shown inFIGS. 2 , 3, and 4, the cylinder head lower section 152-2 is formed with ahollow space 152 c (which will be described later) extending from the side of thenon-contact surface 152 q toward thegas inflow space 152 b in the interior of the sealed container (recess 152 d) such that thehollow space 152 c is in communication with thegas inflow space 152 b in the interior of the sealed container. - The
suction hole 151 a provides communication between the communication pipe 162 (the communicationpipe exit section 162 a) of thesuction muffler 160 and thecompression chamber 134. Asuction valve 153 for opening and closing thesuction hole 151 a is provided on the surface of thevalve plate 151 which is closer to thecompression chamber 134. Thesuction hole 151 a can be opened and closed by thesuction valve 153. The refrigerant gas is suctioned from thesuction muffler 160 into thecompression chamber 134, via thesuction hole 151 a, when thesuction valve 153 is opened. - The
discharge hole 151 b provides communication between thecylinder head 152 and thecompression chamber 134. Thedischarge hole 151 b is opened and closed by a discharge valve (not shown). Thecylinder head 152 is formed with thedischarge space 152 a inside thereof. The refrigerant gas is discharged from thecompression chamber 134 to thedischarge space 152 a through thedischarge hole 151 b. Thedischarge pipe 154 is coupled to thecylinder head 152 and to adischarge pipe 105. Therefore, thedischarge space 152 a is in communication with thedischarge pipe 105 via thedischarge pipe 154. Thesuction muffler 160 is located at a lower side in the interior of sealedcontainer 101, from the perspective of thecylinder 133 and thecylinder head 152. Thesuction muffler 160 is made of, for example, a composite material comprising a resin such as PBT (polybuthylene terephthalate) and reinforced fibers such as glass fibers added to the resin. Thesuction muffler 160 includes atail pipe 161, thecommunication pipe 162, amuffler body 163, and others. The material of thesuction muffler 160 is not limited to the composite material containing the PBT so long as thesuction muffler 160 is molded by use of least a resin. - A muffling
space 163 a of thesuction muffler 160 is formed by themuffler body 163. Thetail pipe 161 is in communication with the internal space of the sealedcontainer 101, and serves to guide the refrigerant gas to the interior of themuffler body 163. Thecommunication pipe 162 is located at the upper side of themuffler body 163. Thecommunication pipe 162 is in communication with thecompression chamber 134 via thesuction hole 151 a of thevalve plate 151. Thecommunication pipe 162 guides the refrigerant gas from the interior of themuffler body 163 to the interior of thecompression chamber 134. - The
communication pipe 162 of thesuction muffler 160 extends upward toward the other end portion (end portion which is away from the crankshaft 140) of thecylinder 133, in a location between thevalve plate 151 and thecylinder head 152. As shown inFIGS. 2 and 3 , the upper end of thecommunication pipe 162 is provided with the communicationpipe exit section 162 a. - As described above, the
cylinder head 152 is provided with therecess 152 d in a location that is closer to thecompression chamber 134. The communicationpipe exit section 162 a is inserted into therecess 152 d such that a specified space (thegas inflow space 152 b in the interior of the sealed container) is formed between the communicationpipe exit section 162 a and theopposed surface 152 r (inner surface of therecess 152 d). For example, an elastic member (not shown) is placed inside of therecess 152 d. This elastic member presses the communicationpipe exit section 162 a against thevalve plate 151, and thus the communicationpipe exit section 162 a is retained between the elastic member and thevalve plate 151. - An
opening section 162 b is provided at the tip end of the communicationpipe exit section 162 a. Theopening section 162 b is in communication with thesuction hole 151 a of thevalve plate 151. The state in which theopening section 162 b and thesuction hole 151 a are in communication with each other is not particularly limited. In the present embodiment, as shown inFIG. 2 , theopening section 162 b protrudes from the communicationpipe exit section 162 a and is inserted into thesuction hole 151 a. In this structure, theopening section 162 b does not contact the surface of thevalve plate 151 which is closer to thecylinder head 152, but is inserted into thesuction hole 151 a and exposed at the surface which is closer to thecylinder 133. - Since the
opening section 162 b of the communicationpipe exit section 162 a and thesuction hole 151 a are in communication with each other as described above, thecommunication pipe 162 and thecompression chamber 134 are in communication with each other via thesuction hole 151 a (and the suction valve 153). Therefore, thesuction muffler 160 is in communication with thecompression chamber 134 inside of thecylinder 133 via thecommunication pipe 162, and the upper end (the communicationpipe exit section 162 a) of thecommunication pipe 162 is placed in a biased manner inside of therecess 152 d of thecylinder head 152. In this way, thesuction muffler 160 is fastened to thevalve plate 151. - [Operation of Sealed Compressor]
- Next, the operation and advantages of the sealed
compressor 100 configured as described above will be specifically described. Although not shown inFIGS. 1 to 4 , the sealedcompressor 100 is incorporated into the refrigeration cycle in such a manner that thesuction pipe 104 and thedischarge pipe 105 are connected to the refrigeration device having a well-known configuration. - Initially, when the
electric component 120 is applied with a current from an external electric power supply, the current flows through thestator 121, to generate a magnetic field, causing therotor 122 to rotate. According to the rotation of therotor 122, themain shaft 142 of thecrankshaft 140 rotates, and then the rotational motion of themain shaft 142 is transmitted to thepiston 132 via theeccentric shaft 141 and thecoupling section 136. Thepiston 132 reciprocates in the interior of thecylinder 133. According to the reciprocation motion of thepiston 132, the refrigerant gas is suctioned, compressed and discharged in the interior of thecompression chamber 134. - This will be described more specifically. Now, of the direction in which the
piston 132 moves in the interior of thecylinder 133, a direction in which the volume of thecompression chamber 134 increases will be referred to as “increase direction” and a direction in which the volume of thecompression chamber 134 decreases will be referred to as “decrease direction”. When thepiston 132 moves in the increase direction, the refrigerant gas in the interior of thecompression chamber 134 expands. When a pressure in the interior of thecompression chamber 134 falls below a suction pressure, thesuction valve 153 starts to open due to a difference between the pressure in the interior of thecompression chamber 134 and the pressure in the interior of thesuction muffler 160. - According to this operation, the low-temperature refrigerant gas which has returned from the refrigeration device is released to the interior of the sealed
container 101 from thesuction pipe 104. Then, the refrigerant gas is suctioned from a suction port (not shown) provided on thesuction muffler 160 and introduced to the interior of the mufflingspace 163 a of themuffler body 163 via thetail pipe 161. At this time, since thesuction valve 153 starts to open as described above, the introduced refrigerant gas flows into thecompression chamber 134 through thecommunication pipe 162 and thesuction hole 151 a. After that, when thepiston 132 moves from a bottom dead center in the decrease direction in the interior of thecylinder 133, the refrigerant gas is compressed in the interior of thecompression chamber 134, so that the pressure in the interior of thecompression chamber 134 increases. In addition, due to a difference between the pressure in the interior of thecompression chamber 134 and the pressure in the interior of thesuction muffler 160, thesuction valve 153 is closed. - Then, when the pressure in the interior of the
compression chamber 134 exceeds the pressure in the interior of thedischarge space 152 a, the discharge valve (not shown) starts to open, due to a difference between the pressure in the interior of thecompression chamber 134 and the pressure in the interior of thedischarge space 152 a. - According to this operation, during a period that passes until the
piston 132 reaches a top dead center in the interior of thecylinder 133, the compressed refrigerant gas is discharged to thedischarge space 152 a through thedischarge hole 151 b. The refrigerant gas discharged to thedischarge space 152 a is sent out to the refrigeration device via thedischarge pipe 154 and thedischarge pipe 105. - After that, when the
piston 132 moves again in the increase direction from the top dead center in the interior of thecylinder 133, the refrigerant gas in the interior of thecompression chamber 134 expands, so that the pressure in the interior of thecompression chamber 134 decreases. When the pressure in the interior of thecompression chamber 134 falls below the pressure in the interior of thedischarge space 152 a, the discharge valve is closed. - The above described suction stroke, compression stroke and discharge stroke are repeatedly performed in every rotation of the
crankshaft 140, and thus the refrigerant gas is circulated within the refrigeration cycle. - [Configuration of Cylinder Head and Configuration of Communication Pipe Exit Section]
- Next, the
gas inflow space 152 b in the interior of the sealed container (gas inflow space 152 b), which is defined by thecylinder head 152 and the communicationpipe exit section 162 a, will be specifically described with reference toFIGS. 2 to 4 . - As shown in
FIGS. 2 and 4 , in therecess 152 d of thecylinder head 152, thegas inflow space 152 b is formed between theopposed surface 152 r (seeFIG. 3 ) and the communicationpipe exit section 162 a. Thegas inflow space 152 b includes afirst space 152 b-1 as a lateral space and asecond space 152 b-2 as a longitudinal space. - The
first space 152 b-1 is formed between the lower surface of thecylinder head 152 inside of therecess 152 d and the upper peripheral surface of the communicationpipe exit section 162 a. The lower surface of thecylinder head 152 inside of therecess 152 d corresponds to a curved surface (upper curved surface of therecess 152 d) of theopposed surface 152 r of therecess 152 d, which is closer to thedischarge space 152 a. Thesecond space 152 b-2 is formed between the side surface of thecylinder head 152 inside of therecess 152 d and the side peripheral surface of the communicationpipe exit section 162 a. The side surface of thecylinder head 152 inside of therecess 152 d corresponds to the inner peripheral curved surface of theopposed surface 152 r of therecess 152 d, which is other than the upper curved surface. Thefirst space 152 b-1 and thesecond space 152 b-2 constitute a continuous one space formed around the communicationpipe exit section 162 a, i.e., thegas inflow space 152 b. Thefirst space 152 b-1 and thesecond space 152 b-2 are in communication with the sealed space in the interior of the sealedcontainer 101. - Since the
first space 152 b-1 is the lateral space of thegas inflow space 152 b, thefirst space 152 b-1 is regarded as the space extending along the axial direction of thepiston 132 so as to face the upper peripheral surface of the communicationpipe exit section 162 a. In contrast, since thesecond space 152 b-2 is the longitudinal space of thegas inflow space 152 b, thesecond space 152 b-2 is regarded as the space extending along the axial direction of thecrankshaft 140 so as to face the side peripheral surface of the communicationpipe exit section 162 a. As shown inFIG. 2 , thegas inflow space 152 b is configured in such a manner that a thickness W1 of thefirst space 152 b-1 is larger than a thickness W2 of thesecond space 152 b-2. - The thickness W1 of the
first space 152 b-1 is set to the average value of the lengths of a plurality of perpendicular lines which are drawn from the upper curved surface of therecess 152 d to the upper peripheral surface of the communicationpipe exit section 162 a. Also, the thickness W2 of thesecond space 152 b-2 is set to the average value of the lengths of a plurality of perpendicular lines which are drawn from the inner peripheral curved surface of therecess 152 d to the side peripheral surface of the communicationpipe exit section 162 a. - Further, in the present embodiment, as shown in
FIGS. 2 , 3, and 4, the cylinder head lower section 152-2 of thecylinder head 152 is formed with thehollow space 152 c. As indicated by a dotted line ofFIG. 4 , thehollow space 152 c is formed in a location obtained by projecting theopening section 162 b of the communicationpipe exit section 162 a to the cylinder head lower section 152-2. As shown inFIG. 2 , theopening section 162 b is placed in communication with thesuction hole 151 a of thevalve plate 151. Therefore, thehollow space 152 c is formed in the location (on a projection plane) obtained by projecting thesuction hole 151 a to the cylinder head lower section 152-2. - As shown in
FIGS. 2 and 3 , thehollow space 152 c is provided to extend along the axial direction of thepiston 132, in the cylinder head lower section 152-2, and therefore constitutes an opening which is in communication with thesecond space 152 b-2 of thegas inflow space 152 b. As shown inFIG. 4 , the opening of thehollow space 152 c preferably includes theopening section 162 b of the communicationpipe exit section 162 a. Therefore, the size of the opening of thehollow space 152 c is preferably larger than the area of theopening section 162 b and the area of the correspondingsuction hole 151 a. Although in the example ofFIG. 4 , the opening of thehollow space 152 c has a laterally elongated shape, the shape of the opening of thehollow space 152 c is not limited to this. - In addition to the above, in the present embodiment, as shown in
FIGS. 2 and 4 , theheat insulating space 162 c is formed on the outer periphery of the communicationpipe exit section 162 a, which is immediately below theopening section 162 b (the outer periphery of the communicationpipe exit section 162 a, which faces the valve plate 151). Since theheat insulating space 162 c is formed as a recess in the outer periphery of the communicationpipe exit section 162 a, this recess may be formed integrally on the outer periphery of the communicationpipe exit section 162 a when thesuction muffler 160 is molded, for example. Further, the recess may be processed after thesuction muffler 160 is molded. Preferably, the recess is molded integrally with thesuction muffler 160, when thesuction muffler 160 is molded. - The interior of the
heat insulating space 162 c and the interior of thecommunication pipe 162 are in communication with each other via acommunication hole 162 d. In other words, on the outer periphery of the communicationpipe exit section 162 a, which is immediately below theopening section 162 b, theheat insulating space 162 c and thecommunication hole 162 d penetrating thecommunication pipe 162 are formed. As shown inFIGS. 2 and 4 , theheat insulating space 162 c is formed as the recess which opens toward thevalve plate 151. Since the communicationpipe exit section 162 a is in contact with thevalve plate 151, theheat insulating space 162 c is a sealed space isolated from the surrounding sealed space and thegas inflow space 152 b. The refrigerant gas inside of thecommunication pipe 162 is introduced into theheat insulating space 162 c via thecommunication hole 162 d, and does not leak from theheat insulating space 162 c. - The advantage attained by suppressing a temperature increase in the suctioned refrigerant gas and effectively suppressing a decrease in the volumetric efficiency, which is associated with the
gas inflow space 152 b, will be now described. - The
cylinder head 152 and thevalve plate 151 which is in sealing contact with thecylinder head 152 are heated by the high-temperature refrigerant gas in the interior of thedischarge space 152 a and raised in temperature. In addition, thevalve plate 151 is also heated by the compressed refrigerant gas in the interior of thecompression chamber 134 and raised in temperature. In a sealed compressor having a typical configuration, the refrigerant gas suctioned into thesuction muffler 160 is heated and its volume is increased by thevalve plate 151, while the refrigerant gas is flowing from the communicationpipe exit section 162 a and through thesuction hole 151 a of thevalve plate 151. For this reason, in the conventional sealed compressor, the volumetric efficiency is decreased. - In contrast, in the present embodiment, since the
gas inflow space 152 b in the interior of the sealed container is formed between the communicationpipe exit section 162 a and thecylinder head 152, thegas inflow space 152 b becomes a heat insulating layer which can suppress heat transfer from the high-temperature cylinder head 152 to the communicationpipe exit section 162 a. Since heating of the refrigerant gas can be suppressed effectively when the refrigerant gas is suctioned into thecompression chamber 134, the volumetric efficiency of the sealedcompressor 100 can be increased. - The space temperatures will now be described. The temperature of the
discharge space 152 a inside of thecylinder head 152 is the highest, and the temperature of the inner space of the sealedcontainer 101 is higher than the temperature of the interior of thecommunication pipe 162 of thesuction muffler 160. In order to suppress heat transfer to the refrigerant gas flowing through the communication pipe 162 (especially the communicationpipe exit section 162 a), thegas inflow space 152 b is configured in such a manner that the thickness W1 of thefirst space 152 b-1 extending along the axial direction (lateral direction) of thepiston 132 is set larger than the thickness W2 of thesecond space 152 b-2 extending along the axial direction (longitudinal direction) of thecrankshaft 140. In other words, by setting the thickness W1 of thefirst space 152 b-1 located below thedischarge space 152 a larger than the thickness W2 of thesecond space 152 b-2, it becomes possible to effectively suppress the heat transfer from thedischarge space 152 a with a large heat amount to the communicationpipe exit section 162 a. - As shown in
FIG. 2 , in the present embodiment, theopening section 162 b at the tip end of the communicationpipe exit section 162 a protrudes and is inserted into thesuction hole 151 a. This makes it possible to avoid a situation in which the low-temperature refrigerant gas directly contacts the high-temperature valve plate 151 when the refrigerant gas flowing through thecommunication pipe 162 is suctioned into thecompression chamber 134. - In accordance with the present embodiment, the
second space 152 b-2 of thegas inflow space 152 b suppresses the heat transfer from the cylinder head lower section 152-2 of thecylinder head 152 to the refrigerant gas flowing through the communicationpipe exit section 162 a, while thefirst space 152 b-1 of thegas inflow space 152 b suppresses the heat transfer from thedischarge space 152 a inside of the cylinder head upper section 152-1 to the refrigerant gas flowing through the communicationpipe exit section 162 a. Because of this, it becomes possible to effectively suppress a temperature increase in the refrigerant gas suctioned from theopening section 162 b to the interior of thecompression chamber 134 via thesuction hole 151 a. In addition, as described above, theopening section 162 b inserted into thesuction hole 151 a also serves as the heat insulating layer. Since it becomes possible to suppress the heat transfer from the high-temperature valve plate 151 to the refrigerant gas which has been suppressed in temperature increase, the low-temperature refrigerant gas which has been suppressed in temperature increase can be suctioned into thecompression chamber 134. - The cylinder head lower section 152-2 of the
cylinder head 152 is formed with thehollow space 152 c with a size including the opening area of thesuction hole 151 a, on the lateral projection plane of thesuction hole 151 a. In this structure, a portion of the high-temperature cylinder head 152 (cylinder head lower section 152-2) does not exist in the lateral direction, from the perspective of theopening section 162 b of the communicationpipe exit section 162 a. Further, thesecond space 152 b-2 of thegas inflow space 152 b is formed between the communicationpipe exit section 162 a and the cylinder head lower section 152-2, while thefirst space 152 b-1 of thegas inflow space 152 b is formed between the communicationpipe exit section 162 a and the cylinder head upper section 152-1. This structure can reduce the area of a portion of thecylinder head 152 and a portion of the communicationpipe exit section 162 a, which overlap with each other, with thegas inflow space 152 b located between thecylinder head 152 and the communicationpipe exit section 162 a. As a result, it becomes possible to more effectively suppress the heat transfer from the high-temperature cylinder head 152 to the communicationpipe exit section 162 a, and more effectively suppress a temperature increase in the refrigerant gas. - Further, the communication
pipe exit section 162 a is formed with theheat insulating space 162 c isolated from the sealed space, on the outer periphery immediately below theopening section 162 b. As described above, theheat insulating space 162 c is formed integrally when thesuction muffler 160 is manufactured by molding. The refrigerant gas is introduced into theheat insulating space 162 c through thecommunication hole 162 d. Therefore, theheat insulating space 162 c can be kept at a low temperature which is close to the temperature of the refrigerant gas by the low-temperature refrigerant gas introduced thereinto. In this way, it becomes possible to provide heat insulation between the outer periphery of the communicationpipe exit section 162 a which is closer to thevalve plate 151 and thevalve plate 151. Thus, the communicationpipe exit section 162 a can be thermally insulated from thecylinder head 152 by thegas inflow space 152 b and further thermally insulated by theheat insulating space 162 c. As a result, it becomes possible to more effectively suppress a temperature increase in the refrigerant gas flowing through the communicationpipe exit section 162 a. - As described above, in the present embodiment, since at least the
gas inflow space 152 b in the interior of the sealed container is formed, the heat transfer from thecylinder head 152 to the communicationpipe exit section 162 a can be suppressed. In addition, since the cylinder head lower section 152-2 of thecylinder head 152 is formed with thehollow space 152 c, the heat transfer to the communicationpipe exit section 162 a can be suppressed more effectively. Further, since theopening section 162 b of the communicationpipe exit section 162 a is inserted into thesuction hole 151 a, the heat transfer from thevalve plate 151 to the refrigerant gas inside of theopening section 162 b can be suppressed. Since theheat insulating space 162 c is provided immediately below theopening section 162 b of the communicationpipe exit section 162 a, the heat transfer from thevalve plate 151 to the communicationpipe exit section 162 a can be suppressed more effectively. Because of the above, in accordance with the present embodiment, it becomes possible to effectively suppress a temperature increase in the suctioned refrigerant gas, flowing though thecommunication pipe 162. As a result, the volumetric efficiency can be increased, and hence the efficiency of the sealedcompressor 100 can be increased. - Although in the present embodiment, the operating frequency of the sealed
compressor 100 is not particularly limited, the sealedcompressor 100 may be configured to be inverter-driven at one of a plurality of operating frequencies. As described above, in the present embodiment, since at least thegas inflow space 152 b in the interior of the sealing container is formed, the heat transfer from thecylinder head 152 and thevalve plate 151 which are in high-temperature states to the refrigerant gas flowing through the communicationpipe exit section 162 a can be suppressed. In this configuration, even when the refrigerant gas flows through thecommunication pipe 162 at a relatively low velocity, the heat transfer from thecylinder head 152 and thevalve plate 151 to the refrigerant gas can be suppressed effectively. Therefore, the sealedcompressor 100 can be inverter-driven to rotate at a low speed. - In the present embodiment, the
gas inflow space 152 b includes thefirst space 152 b-1 extending in the lateral direction (axial direction of the piston 132) and having the curved cross-section and thesecond space 152 b-2 extending in the longitudinal direction (axial direction of the crankshaft 140) and having the curved cross-section. However, the configuration of thegas inflow space 152 b is not limited to this, and may include thefirst space 152 b-1 and thesecond space 152 b-2, depending on the specific configuration of the sealedcompressor 100. - The
first space 152 b-1 of thegas inflow space 152 b thermally insulates the upper peripheral surface of the communicationpipe exit section 162 a, while thesecond space 152 b-2 of thegas inflow space 152 b thermally insulates the side peripheral surface of the communicationpipe exit section 162 a which is other than the location facing thevalve plate 151. Alternatively, the sealedcompressor 100 may include a space which thermally insulates another peripheral surface of the communicationpipe exit section 162 a or a space which thermally insulates the peripheral surface of a portion of thecommunication pipe 162 which is other than the communicationpipe exit section 162 a, depending on the configuration of the sealedcompressor 100. - Although in the present embodiment, the cylinder head lower section 152-2 of the
cylinder head 152 is formed with thehollow space 152 c, the cylinder head lower section 152-2 may not be formed with thehollow space 152 c, as shown inFIG. 5 . In this case, the thickness W2 of thesecond space 152 b-2 may be set larger than in a case where the cylinder head lower section 152-2 is formed with thehollow space 152 c (configuration ofFIG. 2 ). Therefore, in thegas inflow space 152 b, the thickness W1 of thefirst space 152 b-1 which is located closer to thedischarge space 152 a in a higher-temperature state is preferably larger than the thickness W2 of thesecond space 152 b-2. However, depending on the specific configuration of the sealedcompressor 100, the thickness W1 of thefirst space 152 b-1 may be equal to the thickness W2 of thesecond space 152 b-2, or the thickness W2 of thesecond space 152 b-2 may be larger the thickness W1 of thefirst space 152 b-1. - Further, a known spacer may be provided between the communication
pipe exit section 162 a and therecess 152 d of thecylinder head 152, to suitably maintain the thickness W1 and the thickness W2 of thegas inflow space 152 b. This spacer may have a low heat conductivity and have a stiffness which can maintain the shape between theopposed surface 152 r of therecess 152 d, facing the outer surface of the communicationpipe exit section 162 a, and the outer peripheral surface of the communicationpipe exit section 162 a. - In
Embodiment 2, an exemplary refrigeration device including the sealedcompressor 100 described inEmbodiment 1 will be described specifically with reference toFIG. 6 . - The sealed
compressor 100 of the present invention can be suitably incorporated into a refrigeration cycle or various devices (refrigeration devices) having a configuration similar to that of the refrigeration cycle. Specifically, for example, the devices may be a refrigerator (refrigerator for household use or refrigerator for business purpose), an ice making machine, a show case, a dehumidifier, a heat pump type hot water supply device, a heat pump type laundry/drying machine, an automatic vending machine, an air conditioner, an air compressor, etc. However, these are merely exemplary. In the present embodiment, the basic configuration of arefrigeration device 200 will be described in conjunction with an article storage device ofFIG. 6 , as an exemplary device into which of the sealedcompressor 100 of the present invention is incorporated. - The
refrigeration device 200 ofFIG. 6 includes arefrigeration device body 201 and a refrigeration circuit 205. Therefrigeration device body 201 includes a heat insulating casing having an opening and a door which opens and closes the opening of the casing. Therefrigeration device body 201 includes in the interior thereof astorage space 202 storing articles, amechanical room 203 storing the refrigerant circuit 205 and the like, and apartition wall 204 which defines thestorage space 202 and themechanical room 203. - The refrigeration circuit 205 is configured such that the sealed
compressor 100 ofEmbodiment 1, aheat radiator 206, a pressure-reducingdevice 207, and aheat absorbing unit 208 are connected together in an annular shape by use of apipe 209. In brief, the refrigeration circuit 205 is an exemplary refrigeration cycle using the sealedcompressor 100 of the present invention. - In the refrigeration circuit 205, the sealed
compressor 100, theheat radiator 206, and the pressure-reducingdevice 207 are placed in themechanical room 203, while theheat absorbing unit 208 is placed in thestorage space 202 including a blower (not shown inFIG. 6 ). As indicated by a broken line arrow, the blower agitates cooling heat of theheat absorbing unit 208 to circulate the cooling heat in the interior of thestorage space 202. - As described above, the
refrigeration device 200 of the present embodiment incorporates the sealedcompressor 100 ofEmbodiment 1. As described above, since the sealedcompressor 100 includes thegas inflow space 152 b in the interior of the sealed container, a decrease in the volumetric efficiency can be suppressed effectively by suppressing a temperature increase in the refrigerant gas. Thus, the efficiency of the sealedcompressor 100 is high. By operating the refrigeration circuit 205 by use of the sealedcompressor 100 with such high efficiency, electric consumption in therefrigeration device 200 can be reduced, and hence energy saving can be realized. - Numerous improvements and alternative embodiments of the invention will be apparent to those skilled in the art in view of the foregoing description. Accordingly, the description is to be construed as illustrative only, and is provided for the purpose of teaching those skilled in the art the best mode of carrying out the invention. The details of the structure and/or function may be varied substantially without departing from the spirit of the invention.
- The present invention can increase the efficiency of a sealed compressor, and therefore is suitably used in the fields of the sealed compressor. For example, the present invention can be widely suitably used in the fields of refrigeration devices including sealed compressors, such as refrigeration devices for household uses such as electric freezers/refrigerators or air conditioners, or refrigeration devices for business purposes such as a show case for business purpose or an automatic vending machine, etc.
-
- 100 sealed compressor
- 101 sealed container
- 104 suction pipe
- 105 discharge pipe
- 120 electric component
- 130 compression component
- 131 cylinder block
- 132 piston
- 133 cylinder
- 134 compression chamber
- 136 coupling section
- 140 crankshaft
- 141 eccentric shaft
- 142 main shaft
- 151 valve plate
- 151 a suction hole
- 151 b discharge hole
- 152 cylinder head
- 152-1 cylinder head upper section
- 152-2 cylinder head lower section
- 152 a discharge space
- 152 b gas inflow space in interior of sealed container
- 152 c hollow space
- 152 d recess
- 153 suction valve
- 154 discharge pipe
- 160 suction muffler
- 161 tail pipe
- 162 communication pipe
- 162 a communication pipe exit section
- 162 b opening section
- 162 c heat insulating space
- 163 muffler body
- 163 a muffling space
- 200 refrigeration device
- 205 refrigeration circuit
- 206 heat radiator
- 207 pressure-reducing device
- 208 heat absorbing unit
Claims (8)
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
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JP2013021887 | 2013-02-07 | ||
JP2013-021887 | 2013-02-07 | ||
PCT/JP2014/000633 WO2014122931A1 (en) | 2013-02-07 | 2014-02-06 | Sealed compressor and refrigerating apparatus |
Publications (1)
Publication Number | Publication Date |
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US20150369526A1 true US20150369526A1 (en) | 2015-12-24 |
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US14/766,033 Abandoned US20150369526A1 (en) | 2013-02-07 | 2014-02-06 | Sealed compressor and refrigeration device |
Country Status (4)
Country | Link |
---|---|
US (1) | US20150369526A1 (en) |
JP (2) | JP6065239B2 (en) |
CN (1) | CN104968937B (en) |
WO (1) | WO2014122931A1 (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20160201661A1 (en) * | 2013-09-03 | 2016-07-14 | Panasonic Intellectual Property Management Co., Ltd. | Sealed compressor and freezer device or refrigerator equipped with same |
EP3543530A4 (en) * | 2016-11-18 | 2019-11-13 | Panasonic Intellectual Property Management Co., Ltd. | Refrigerant compressor and refrigeration device provided with same |
CN113090493A (en) * | 2021-04-30 | 2021-07-09 | 黄石东贝压缩机有限公司 | Totally-enclosed piston refrigeration compressor |
US11959670B2 (en) | 2016-11-18 | 2024-04-16 | Panasonic Intellectual Property Management Co., Ltd. | Refrigerant compressor and freezer including same |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP3455497A1 (en) | 2016-05-10 | 2019-03-20 | Arçelik Anonim Sirketi | A hermetic compressor with improved sealing |
CN108457839A (en) * | 2018-05-30 | 2018-08-28 | 江苏白雪电器股份有限公司 | Compressor and its air suction silencer |
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US20030108438A1 (en) * | 2000-04-25 | 2003-06-12 | Young-Jong Kim | Compressor |
US20060039803A1 (en) * | 2003-08-26 | 2006-02-23 | Matsushita Electric Industrial Co., Ltd | Hermetic compressor |
US20060230782A1 (en) * | 2005-03-30 | 2006-10-19 | Satoshi Imai | Refrigerating device and refrigerator |
US20100239438A1 (en) * | 2007-12-06 | 2010-09-23 | Panasonic Corporation | Hermetic compressor |
US20110271709A1 (en) * | 2009-02-13 | 2011-11-10 | Panasonic Corporation | Sealed compressor and refrigeration device |
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JPS5660883A (en) * | 1979-10-18 | 1981-05-26 | Toshiba Corp | Compressor |
JPS58178477U (en) * | 1982-05-26 | 1983-11-29 | 株式会社日立製作所 | Hermetic electric compressor |
JP3126781B2 (en) * | 1990-12-12 | 2001-01-22 | エルジー電子株式会社 | Cylinder head of hermetic reciprocating compressor |
US5288212A (en) * | 1990-12-12 | 1994-02-22 | Goldstar Co., Ltd. | Cylinder head of hermetic reciprocating compressor |
JPH0599141A (en) * | 1991-10-02 | 1993-04-20 | Matsushita Refrig Co Ltd | Closed type motor-operated compressor |
IT241575Y1 (en) * | 1996-11-19 | 2001-05-09 | Zanussi Elettromecc | REFRIGERATED COMPRESSOR WITH HEAD AND SILENCER PERFECTED |
JP3776025B2 (en) * | 2000-11-29 | 2006-05-17 | 松下冷機株式会社 | Hermetic compressor |
JP4650186B2 (en) * | 2005-09-27 | 2011-03-16 | パナソニック株式会社 | Compressor |
JP2010242591A (en) * | 2009-04-03 | 2010-10-28 | Panasonic Corp | Hermetic compressor and refrigerating device |
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2014
- 2014-02-06 CN CN201480007903.0A patent/CN104968937B/en active Active
- 2014-02-06 JP JP2014560682A patent/JP6065239B2/en active Active
- 2014-02-06 US US14/766,033 patent/US20150369526A1/en not_active Abandoned
- 2014-02-06 WO PCT/JP2014/000633 patent/WO2014122931A1/en active Application Filing
-
2016
- 2016-07-14 JP JP2016139251A patent/JP6259498B2/en active Active
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US20030108438A1 (en) * | 2000-04-25 | 2003-06-12 | Young-Jong Kim | Compressor |
US20060039803A1 (en) * | 2003-08-26 | 2006-02-23 | Matsushita Electric Industrial Co., Ltd | Hermetic compressor |
US20060230782A1 (en) * | 2005-03-30 | 2006-10-19 | Satoshi Imai | Refrigerating device and refrigerator |
US20100239438A1 (en) * | 2007-12-06 | 2010-09-23 | Panasonic Corporation | Hermetic compressor |
US20110271709A1 (en) * | 2009-02-13 | 2011-11-10 | Panasonic Corporation | Sealed compressor and refrigeration device |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20160201661A1 (en) * | 2013-09-03 | 2016-07-14 | Panasonic Intellectual Property Management Co., Ltd. | Sealed compressor and freezer device or refrigerator equipped with same |
US11236740B2 (en) * | 2013-09-03 | 2022-02-01 | Panasonic Appliances Refrigeration Devices Singapore | Sealed compressor and freezer device or refrigerator equipped with same |
EP3543530A4 (en) * | 2016-11-18 | 2019-11-13 | Panasonic Intellectual Property Management Co., Ltd. | Refrigerant compressor and refrigeration device provided with same |
US11143442B2 (en) | 2016-11-18 | 2021-10-12 | Panasonic Intellectual Property Management Co., Ltd. | Refrigerant compressor and freezer including same |
EP4027014A1 (en) * | 2016-11-18 | 2022-07-13 | Panasonic Intellectual Property Management Co., Ltd. | Refrigerant compressor and freezer including same |
US11959670B2 (en) | 2016-11-18 | 2024-04-16 | Panasonic Intellectual Property Management Co., Ltd. | Refrigerant compressor and freezer including same |
CN113090493A (en) * | 2021-04-30 | 2021-07-09 | 黄石东贝压缩机有限公司 | Totally-enclosed piston refrigeration compressor |
Also Published As
Publication number | Publication date |
---|---|
JP2016200151A (en) | 2016-12-01 |
WO2014122931A1 (en) | 2014-08-14 |
CN104968937B (en) | 2017-08-04 |
JP6065239B2 (en) | 2017-01-25 |
JPWO2014122931A1 (en) | 2017-01-26 |
CN104968937A (en) | 2015-10-07 |
JP6259498B2 (en) | 2018-01-10 |
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Legal Events
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Owner name: PANASONIC CORPORATION, JAPAN Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD.;REEL/FRAME:041175/0010 Effective date: 20161212 |
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Owner name: PANASONIC APPLIANCES REFRIGERATION DEVICES SINGAPORE, SINGAPORE Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:PANASONIC CORPORATION;REEL/FRAME:044704/0857 Effective date: 20171206 Owner name: PANASONIC APPLIANCES REFRIGERATION DEVICES SINGAPO Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:PANASONIC CORPORATION;REEL/FRAME:044704/0857 Effective date: 20171206 |
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