US20100310394A1 - Compressor unit - Google Patents
Compressor unit Download PDFInfo
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- US20100310394A1 US20100310394A1 US12/864,250 US86425009A US2010310394A1 US 20100310394 A1 US20100310394 A1 US 20100310394A1 US 86425009 A US86425009 A US 86425009A US 2010310394 A1 US2010310394 A1 US 2010310394A1
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- Prior art keywords
- piston
- compressor unit
- compressor
- cylinder
- interior
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Classifications
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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
- F04B35/045—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 using solenoids
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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
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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
- 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
- F04B39/126—Cylinder liners
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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
- F04B53/12—Valves; Arrangement of valves arranged in or on pistons
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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
- F04B53/12—Valves; Arrangement of valves arranged in or on pistons
- F04B53/125—Reciprocating valves
- F04B53/127—Disc 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
Definitions
- the present invention relates to a compressor unit comprising a cylinder and a piston that delimit a compressor chamber, a linear drive for driving a relative movement of the cylinder and piston and a capsule that surrounds at least the cylinder and the piston.
- Such a capsule is conventionally used as a reservoir for gas to be compressed, from which the gas is sucked into the compressor chamber, and a pipeline for drawing off the compressed gas is guided out of the compressor chamber through the interior.
- a further problem is associated with the design of the conventional linear compressors.
- These generally include a permanent magnet armature which can be linearly moved to and fro in an air gap of an electromagnet.
- These linear drives are characterized in that the driving force acting on the armature can be directly transferred to the piston without interconnected levers or suchlike and consequently practically without any frictional losses, but, contrary to a conventional rotary drive, the amplitude of the piston movement is not predefined in a constructionally-specific fashion, but can instead be influenced by the intensity of the magnetic field acting on the armature.
- the compressor chamber at the upper dead center of the piston movement should be as small as possible, but it should also be prevented that the cylinder and piston strike one another at the dead center in order to keep the operating noise of the compressor and the stresses within a limit.
- the object of the present invention is to specify a compressor unit of the type cited in the introduction, which enables an efficient dissipation of the heat which is released in the compressor chamber and/or despite a high degree of efficiency prevents excessive stress on the material or noise development as a result of the cylinder and piston striking one another.
- the object is achieved by an outlet opening of the compressor chamber opening into an interior of the capsule instead of an intake opening, in the case of a compressor unit comprising a cylinder and a piston, which delimit a compressor chamber, a linear drive for driving a relative movement of the cylinder and piston and a capsule, which at least surrounds the cylinder and the piston.
- the compressed gas ejected by the compressor chamber is significantly warmer than the low pressure gas previously ingested, so that the cylinder and piston, if they essentially release their heat into the environment only by way of the gas in the interior, cannot be colder than this gas during stationary operation, its heat conductivity as a result of its high density is greater by a multiple than that of the uncompressed gas, so that an overheating of the cylinder and piston can consequently be reliably prevented.
- a further effect which results from the presence of the compressed gas in the capsule surrounding the cylinder and piston is that the high pressure of the compressed gas acts on the rear of the piston.
- the linear drive 1 must therefore essentially only provide driving power in an expansion phase of the compressor chamber, if the piston is withdrawn from the cylinder counter to the pressure of the compressed gas in the interior.
- the counter movement of the piston requires hardly any external drive force, since the pressure of the gas in the interior is essentially sufficient to repel the piston. If the linear drive were not to provide any driving power during the compression phase, the piston would then come to a standstill shortly before the upper dead center, if the pressures in the compression chamber and in the interior of the capsule become the same.
- a small amount of operating energy of the linear drive during the compression phase is sufficient to overcome this pressure equalization position and to expel the contents of the compressor chamber.
- the energy with which the cylinder and piston could strike one another in the case of pressure fluctuations lies in the order of magnitude of this drive energy and can therefore be kept significantly lower than in the case of a compressor, in which the linear drive in the compression phase must work against the pressure developing in the compressor chamber.
- the piston in the cylinder is preferably gas-pressure mounted.
- the gas pressure mounting is advantageous in that it enables a practically frictionless piston movement.
- the heat dissipation from the piston via a gas thrust bearing is less efficient than via an oil film, but this is not critical in the present case since the piston is able to output sufficient heat via the high pressure gas of the interior.
- bores are preferably provided in a casing of the cylinder, which connect a gap between the casing and a lateral surface of the piston to the interior.
- channels for supplying pressurized gas from the compressor chamber into the gap can extend between a face surface and the lateral face of the piston. These channels facilitate maintenance of the gas thrust bearing in the vicinity of the upper dead center, if, as a result of the pressure equalization and/or the overpressure in the compressor chamber, the inflow of gas from the interior via the bores of the casing ceases.
- the channels can be embodied as bores or as open grooves.
- the outlet opening of the compressor chamber can be formed in the piston.
- An entire face surface of the cylinder is thus available in order to accommodate there an inlet valve with a large cross-sectional surface and accordingly minimal drop in pressure.
- a suction gas line is preferably routed through the interior to the compressor chamber in order to supply the suction gas rapidly and with minimal heating by means of the pressurized gas from the interior of the compressor chamber.
- FIG. 1 shows a schematic section of an inventive compressor unit
- FIG. 2 shows an enlarged detail of the compressor unit according to a first embodiment
- FIG. 3 shows a top view onto the face surface of the piston of the compressor unit according to the first embodiment
- FIG. 4 shows the detail in FIG. 2 in accordance with a second embodiment
- FIG. 5 shows a top view onto the face surface of the piston in accordance with the second embodiment.
- the linear compressor unit shown in FIG. 1 has a linear drive 1 with a permanent magnet armature suspended so as to be oscillatable in a gap 2 between two opposite electromagnets 3 .
- the electromagnets 3 each have an E-shaped brace with windings surrounding a central arm of the brace.
- the armature 4 is excited by an alternating current applied to the electromagnets 3 by a supply circuit (not shown) to an oscillation movement in the longitudinal direction of the gap 2 which is controlled by the return springs 23 .
- a compressor includes a cylinder 7 and a piston 6 which can be moved in the cylinder 7 .
- the piston 6 is coupled to the armature 4 by way of a piston rod 5 .
- the cylinder 7 is fixedly connected to the electromagnet 3 by way of a frame part 24 , with which the return springs 23 also engage.
- the design comprising linear drive 1 and compressor is hermetically enclosed in a capsule 8 and suspended so as to be oscillatable by way of springs (not shown) which engage with the frame part 24 and the capsule 8 .
- An elastic pipeline 9 extends through a wall of the capsule 8 to a prechamber 10 of the cylinder.
- the prechamber 10 is separated from a compressor chamber 12 delimited by the cylinder 7 and the piston 6 by a non-return valve 11 .
- a further non-return valve 13 is arranged opposite the non-return valve in a face surface 14 of the piston 6 .
- This is embodied in the present case in the manner of a circular truncated cone and forms the valve seat with its lateral surface in a passage of the piston base.
- the smaller base surface of the circular truncated cone projects opposite the base of the piston 6 and forms a stop surface.
- the frequency of the alternating current is attuned to the resonance frequency of the oscillating system comprising linear drive 1 , compressor and return springs 23 .
- the amplitude of the oscillation movement is dependent on the electrical power fed by the supply circuit into the electromagnets 3 . This may be different in the positive and negative half wave of the alternating current, in particular, it may be larger in the half wave driving an expansion movement of the compressor, than in the half wave driving a compression movement.
- the linear drive 1 drives the piston 6 to an oscillation movement, in an expansion phase of the compression chamber 12 , low pressure gas is sucked into the compressor chamber 12 via the pipeline 9 and the prechamber 10 . If towards the end of a compression phase of the compressor the pressure in the compressor chamber 12 exceeds the pressure in the interior 16 sufficiently in order to overcome a closing force of the non-return valve 13 , the non-return valve 13 opens and the compressed gas escapes into the interior 16 of the capsule 8 .
- the pressure in the interior 16 is only marginally lower than the maximum pressure achieved in the compressor chamber 12 , so that the non-return valve 13 only opens briefly before the top dead center is reached.
- the linear drive 1 therefore operates during the overall expansion phase of the compressor chamber 12 against the pressure of the interior 16 , whereas in a compression phase, the pressure in the interior 16 is almost sufficient to compress the gas in the compressor chamber 12 .
- the power which the supply circuit feeds into the electromagnets 3 can therefore be significantly less in a half wave driving the compressor than in a half wave driving the expansion. No complicated monitoring of the piston movement is thus necessary in order to ensure that the piston 6 does not strike the face surface of the cylinder 7 , or at least does not do so with excessive force.
- FIG. 2 shows a significantly enlarged detailed representation of the compressor in FIG. 1 .
- a fragment of a casing 17 of the cylinder 7 and a lateral surface 18 and the front surface 14 of the piston are apparent.
- Numerous narrow bores 19 extend through the casing 17 , by means of which, provided the pressure in the compressor chamber 12 is lower than in the interior 16 , compressed gas flows out of the interior 16 into the compressor chamber 12 and/or into a gap 20 between the casing 17 and the lateral surface 18 , thereby forming a pressurized gas cushion.
- the flow direction of the gas in the gap 20 consequently reverses during the piston movement, while over a large part of the piston path, from the lower dead center to the pressure equalization position, the pressure in the compressor chamber 12 is lower than in the interior 16 and gas flows through the bores 19 and the gap 20 into the compressor chamber 12 , the gas flow in the vicinity of the upper dead center proceeds from the compressor chamber 12 to the interior 16 .
- the piston 6 is thus effectively gas pressure-mounted on both reversal points, if its speed is zero and the duration is accordingly high, and it is only if the piston passes through the pressure equalization position that the gas thrust bearing briefly breaks down. As the piston is moved at this point, the time at which the bearing effect is interrupted is short and the risk of the piston 6 sliding into the cylinder 7 before the bearing effect is used again is minimal
- FIG. 3 shows a top view of the face surface 14 of the piston 6 with the input openings of the bores 21 formed thereon. Dashed lines illustrate the radial course of the bores 21 inside the piston 6 toward the lateral surface 18 .
- FIGS. 4 and 5 each show views similar to FIGS. 2 and 3 in accordance with a second embodiment of the invention.
- the bores 19 of the piston 6 are replaced here by grooves 22 which are cut into the face and lateral surfaces of the piston at an angle from the outside.
- the function of the grooves 22 is the same as that of the bores 19 in the first embodiment.
- the grooves differ by comparison with the bores in that they are easier to manufacture.
- the bores have the smaller dead volume, so that a somewhat higher degree of efficiency can be achieved with the first embodiment than with the second.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Compressors, Vaccum Pumps And Other Relevant Systems (AREA)
- Compressor (AREA)
Abstract
A compressor unit having a cylinder and a piston, wherein the cylinder and the piston delimit a compressor chamber. The compressor unit also includes a capsule that surrounds at least the cylinder and the piston and a linear drive to drive a relative movement of the cylinder, the piston and the capsule. The compressor chamber has an outlet opening that opens into an interior of the capsule.
Description
- The present invention relates to a compressor unit comprising a cylinder and a piston that delimit a compressor chamber, a linear drive for driving a relative movement of the cylinder and piston and a capsule that surrounds at least the cylinder and the piston.
- Such a capsule is conventionally used as a reservoir for gas to be compressed, from which the gas is sucked into the compressor chamber, and a pipeline for drawing off the compressed gas is guided out of the compressor chamber through the interior.
- One problem with these conventional compressor units is that the gas-filled interior and the capsule surrounding the same not only absorb operating noise from the compressor, but also prevent the release of heat into the environment. Heat which is generated during operation of the compressor by means of adiabatic compression of the gas in the compressor chamber, partly passes over into the cylinder and piston and finally heats the gas in the interior around the cylinder and piston. This heating process reduces the quantity of gas which is sucked in and compressed in each movement cycle of the piston, thereby negatively affecting the degree of efficiency of the compressor.
- A further problem is associated with the design of the conventional linear compressors. These generally include a permanent magnet armature which can be linearly moved to and fro in an air gap of an electromagnet. These linear drives are characterized in that the driving force acting on the armature can be directly transferred to the piston without interconnected levers or suchlike and consequently practically without any frictional losses, but, contrary to a conventional rotary drive, the amplitude of the piston movement is not predefined in a constructionally-specific fashion, but can instead be influenced by the intensity of the magnetic field acting on the armature. To achieve a high degree of efficiency of the compressor, the compressor chamber at the upper dead center of the piston movement should be as small as possible, but it should also be prevented that the cylinder and piston strike one another at the dead center in order to keep the operating noise of the compressor and the stresses within a limit.
- The object of the present invention is to specify a compressor unit of the type cited in the introduction, which enables an efficient dissipation of the heat which is released in the compressor chamber and/or despite a high degree of efficiency prevents excessive stress on the material or noise development as a result of the cylinder and piston striking one another.
- The object is achieved by an outlet opening of the compressor chamber opening into an interior of the capsule instead of an intake opening, in the case of a compressor unit comprising a cylinder and a piston, which delimit a compressor chamber, a linear drive for driving a relative movement of the cylinder and piston and a capsule, which at least surrounds the cylinder and the piston. As a result, if the compressor unit is operated, the interior of the capsule is under high pressure. Although the compressed gas ejected by the compressor chamber is significantly warmer than the low pressure gas previously ingested, so that the cylinder and piston, if they essentially release their heat into the environment only by way of the gas in the interior, cannot be colder than this gas during stationary operation, its heat conductivity as a result of its high density is greater by a multiple than that of the uncompressed gas, so that an overheating of the cylinder and piston can consequently be reliably prevented.
- A further effect which results from the presence of the compressed gas in the capsule surrounding the cylinder and piston is that the high pressure of the compressed gas acts on the rear of the piston. The
linear drive 1 must therefore essentially only provide driving power in an expansion phase of the compressor chamber, if the piston is withdrawn from the cylinder counter to the pressure of the compressed gas in the interior. The counter movement of the piston requires hardly any external drive force, since the pressure of the gas in the interior is essentially sufficient to repel the piston. If the linear drive were not to provide any driving power during the compression phase, the piston would then come to a standstill shortly before the upper dead center, if the pressures in the compression chamber and in the interior of the capsule become the same. A small amount of operating energy of the linear drive during the compression phase is sufficient to overcome this pressure equalization position and to expel the contents of the compressor chamber. The energy with which the cylinder and piston could strike one another in the case of pressure fluctuations lies in the order of magnitude of this drive energy and can therefore be kept significantly lower than in the case of a compressor, in which the linear drive in the compression phase must work against the pressure developing in the compressor chamber. - The piston in the cylinder is preferably gas-pressure mounted. By comparison with oil lubrication, the gas pressure mounting is advantageous in that it enables a practically frictionless piston movement. The heat dissipation from the piston via a gas thrust bearing is less efficient than via an oil film, but this is not critical in the present case since the piston is able to output sufficient heat via the high pressure gas of the interior.
- To feed the gas thrust bearing, bores are preferably provided in a casing of the cylinder, which connect a gap between the casing and a lateral surface of the piston to the interior.
- Furthermore, channels for supplying pressurized gas from the compressor chamber into the gap can extend between a face surface and the lateral face of the piston. These channels facilitate maintenance of the gas thrust bearing in the vicinity of the upper dead center, if, as a result of the pressure equalization and/or the overpressure in the compressor chamber, the inflow of gas from the interior via the bores of the casing ceases.
- The channels can be embodied as bores or as open grooves.
- The outlet opening of the compressor chamber can be formed in the piston. An entire face surface of the cylinder is thus available in order to accommodate there an inlet valve with a large cross-sectional surface and accordingly minimal drop in pressure.
- A suction gas line is preferably routed through the interior to the compressor chamber in order to supply the suction gas rapidly and with minimal heating by means of the pressurized gas from the interior of the compressor chamber.
- Further features and advantages of the invention result from the subsequent description of exemplary embodiments with reference to the appended Figures, in which;
-
FIG. 1 shows a schematic section of an inventive compressor unit; -
FIG. 2 shows an enlarged detail of the compressor unit according to a first embodiment; -
FIG. 3 shows a top view onto the face surface of the piston of the compressor unit according to the first embodiment; -
FIG. 4 shows the detail inFIG. 2 in accordance with a second embodiment, and -
FIG. 5 shows a top view onto the face surface of the piston in accordance with the second embodiment. - The linear compressor unit shown in
FIG. 1 has alinear drive 1 with a permanent magnet armature suspended so as to be oscillatable in agap 2 between twoopposite electromagnets 3. Theelectromagnets 3 each have an E-shaped brace with windings surrounding a central arm of the brace. Thearmature 4 is excited by an alternating current applied to theelectromagnets 3 by a supply circuit (not shown) to an oscillation movement in the longitudinal direction of thegap 2 which is controlled by thereturn springs 23. - A compressor includes a cylinder 7 and a
piston 6 which can be moved in the cylinder 7. Thepiston 6 is coupled to thearmature 4 by way of apiston rod 5. The cylinder 7 is fixedly connected to theelectromagnet 3 by way of aframe part 24, with which thereturn springs 23 also engage. The design comprisinglinear drive 1 and compressor is hermetically enclosed in acapsule 8 and suspended so as to be oscillatable by way of springs (not shown) which engage with theframe part 24 and thecapsule 8. - An
elastic pipeline 9 extends through a wall of thecapsule 8 to aprechamber 10 of the cylinder. Theprechamber 10 is separated from acompressor chamber 12 delimited by the cylinder 7 and thepiston 6 by anon-return valve 11. A furthernon-return valve 13 is arranged opposite the non-return valve in aface surface 14 of thepiston 6. This is embodied in the present case in the manner of a circular truncated cone and forms the valve seat with its lateral surface in a passage of the piston base. The smaller base surface of the circular truncated cone projects opposite the base of thepiston 6 and forms a stop surface. - To drive the oscillation movement of the
armature 4 and of thepiston 6 effectively, the frequency of the alternating current is attuned to the resonance frequency of the oscillating system comprisinglinear drive 1, compressor andreturn springs 23. The amplitude of the oscillation movement is dependent on the electrical power fed by the supply circuit into theelectromagnets 3. This may be different in the positive and negative half wave of the alternating current, in particular, it may be larger in the half wave driving an expansion movement of the compressor, than in the half wave driving a compression movement. - If the
linear drive 1 drives thepiston 6 to an oscillation movement, in an expansion phase of thecompression chamber 12, low pressure gas is sucked into thecompressor chamber 12 via thepipeline 9 and theprechamber 10. If towards the end of a compression phase of the compressor the pressure in thecompressor chamber 12 exceeds the pressure in theinterior 16 sufficiently in order to overcome a closing force of thenon-return valve 13, thenon-return valve 13 opens and the compressed gas escapes into theinterior 16 of thecapsule 8. In variation, provision can also be made, if thenon-return valve 13 projects relative to the base of thepiston 6, for said non-return valve to be opened by striking the overhang on the front wall of the cylinder. During stationary operation, the pressure in theinterior 16 is only marginally lower than the maximum pressure achieved in thecompressor chamber 12, so that thenon-return valve 13 only opens briefly before the top dead center is reached. Thelinear drive 1 therefore operates during the overall expansion phase of thecompressor chamber 12 against the pressure of theinterior 16, whereas in a compression phase, the pressure in theinterior 16 is almost sufficient to compress the gas in thecompressor chamber 12. The power which the supply circuit feeds into theelectromagnets 3 can therefore be significantly less in a half wave driving the compressor than in a half wave driving the expansion. No complicated monitoring of the piston movement is thus necessary in order to ensure that thepiston 6 does not strike the face surface of the cylinder 7, or at least does not do so with excessive force. -
FIG. 2 shows a significantly enlarged detailed representation of the compressor inFIG. 1 . A fragment of acasing 17 of the cylinder 7 and alateral surface 18 and thefront surface 14 of the piston are apparent. Numerousnarrow bores 19 extend through thecasing 17, by means of which, provided the pressure in thecompressor chamber 12 is lower than in theinterior 16, compressed gas flows out of theinterior 16 into thecompressor chamber 12 and/or into agap 20 between thecasing 17 and thelateral surface 18, thereby forming a pressurized gas cushion. - Shortly before the
piston 6 reaches its upper dead center during the course of a compression movement of thepiston 6, a pressure equalization results between thecompressor chamber 12 and theinterior 16 and the gas flow through thebores 19 is disrupted.Numerous bores 21 extending diagonally from theface surface 14 toward thelateral surface 18 of thepiston 6 convey the flow of pressurized gas out of thecompressor chamber 12 into thegap 20, if thepiston 6 approaches the top dead center by way of the pressure equalization position. The flow direction of the gas in thegap 20 consequently reverses during the piston movement, while over a large part of the piston path, from the lower dead center to the pressure equalization position, the pressure in thecompressor chamber 12 is lower than in theinterior 16 and gas flows through thebores 19 and thegap 20 into thecompressor chamber 12, the gas flow in the vicinity of the upper dead center proceeds from thecompressor chamber 12 to theinterior 16. Thepiston 6 is thus effectively gas pressure-mounted on both reversal points, if its speed is zero and the duration is accordingly high, and it is only if the piston passes through the pressure equalization position that the gas thrust bearing briefly breaks down. As the piston is moved at this point, the time at which the bearing effect is interrupted is short and the risk of thepiston 6 sliding into the cylinder 7 before the bearing effect is used again is minimal -
FIG. 3 shows a top view of theface surface 14 of thepiston 6 with the input openings of thebores 21 formed thereon. Dashed lines illustrate the radial course of thebores 21 inside thepiston 6 toward thelateral surface 18. -
FIGS. 4 and 5 each show views similar toFIGS. 2 and 3 in accordance with a second embodiment of the invention. Thebores 19 of thepiston 6 are replaced here bygrooves 22 which are cut into the face and lateral surfaces of the piston at an angle from the outside. The function of thegrooves 22 is the same as that of thebores 19 in the first embodiment. The grooves differ by comparison with the bores in that they are easier to manufacture. By contrast, the bores have the smaller dead volume, so that a somewhat higher degree of efficiency can be achieved with the first embodiment than with the second.
Claims (18)
1-16. (canceled)
17. A compressor unit, comprising:
a cylinder;
a piston, the cylinder and the piston delimiting a compressor chamber;
a capsule surrounding at least the cylinder and the piston; and
a linear drive to drive a relative movement of the cylinder, the piston and the capsule;
wherein the compressor chamber has an outlet opening that opens into an interior of the capsule.
18. The compressor unit of claim 17 , wherein the piston is gas pressure-mounted in the cylinder.
19. The compressor unit of claim 18 , wherein the piston has a lateral surface, and wherein the cylinder has a casing with bores that connect a gap between the casing and the lateral surface with the interior of the capsule.
20. The compressor unit of claim 19 , wherein channels to supply pressurized gas from the compressor chamber into the gap extend between a front face and the lateral surface of the piston.
21. The compressor unit of claim 20 , wherein the channels are embodied as bores.
22. The compressor unit of claim 20 , wherein the channels are embodied as grooves.
23. The compressor unit of claim 17 , wherein the outlet opening is formed in the piston.
24. The compressor unit of claim 23 , wherein the outlet opening is formed on a base of the piston.
25. The compressor unit of claim 17 , further comprising a valve to seal the outlet opening.
26. The compressor unit of claim 25 , wherein the valve is a non-return valve.
27. The compressor unit of claim 25 , wherein the valve is a stop valve, and wherein the stop valve opens towards an interior of the piston.
28. The compressor unit of claim 26 , wherein at least one section of the non-return valve protrudes beyond a base of the piston.
29. The compressor unit of claim 28 , wherein the at least one section of the non-return valve is formed from a shock-absorbing material.
30. The compressor unit of claim 29 , wherein the shock-absorbing material is Viton.
31. The compressor unit of claim 26 , wherein the non-return valve is a circular truncated cone having a lateral surface, and wherein the circular truncated cone and the lateral surface form a valve seat in a base of the piston.
32. The compressor unit of claim 31 , wherein the circular truncated cone has a smaller base surface, and wherein the circular truncated cone and the smaller base surface protrude beyond the base of the piston.
33. The compressor unit of claim 17 , further comprising a suction gas line that is guided through the interior of the capsule to the compressor chamber.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102008007661.9 | 2008-02-06 | ||
DE102008007661A DE102008007661A1 (en) | 2008-02-06 | 2008-02-06 | compressor unit |
PCT/EP2009/050962 WO2009098157A1 (en) | 2008-02-06 | 2009-01-28 | Compressor unit |
Publications (1)
Publication Number | Publication Date |
---|---|
US20100310394A1 true US20100310394A1 (en) | 2010-12-09 |
Family
ID=40599913
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US12/864,250 Abandoned US20100310394A1 (en) | 2008-02-06 | 2009-01-28 | Compressor unit |
Country Status (6)
Country | Link |
---|---|
US (1) | US20100310394A1 (en) |
EP (1) | EP2240692A1 (en) |
CN (1) | CN101939542A (en) |
DE (1) | DE102008007661A1 (en) |
RU (1) | RU2010135408A (en) |
WO (1) | WO2009098157A1 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR20150017352A (en) * | 2012-05-11 | 2015-02-16 | 에어로라스 게엠베하, 에어로슈타티쉐 라거- 레이저테크닉 | Piston/cylinder unit |
US20150226203A1 (en) * | 2014-02-10 | 2015-08-13 | General Electric Company | Linear compressor |
US20180195502A1 (en) * | 2017-01-10 | 2018-07-12 | Lg Electronics Inc. | Linear compressor |
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DE102010032036B4 (en) * | 2010-07-19 | 2015-04-30 | Götz-Dieter Seydlitz | roof ventilators |
DE102012104165B3 (en) * | 2012-05-11 | 2013-08-08 | AeroLas GmbH Aerostatische Lager- Lasertechnik | Piston-cylinder unit for e.g. linear air compressor, has exhaust pipe deriving fluid into exhaust groove at pressure level lower than pressure in compression space if piston is moved to top dead center or proximity to top dead center |
DE102012104163B3 (en) * | 2012-05-11 | 2013-08-08 | AeroLas GmbH Aerostatische Lager- Lasertechnik | Piston cylinder unit of linear compressor, has bearing gap whose radial extent is greater than radial extent of compression space facing away from bearing gap section during piston approximation to top dead center of compression space |
DE102012104164B9 (en) * | 2012-05-11 | 2013-10-24 | AeroLas GmbH Aerostatische Lager- Lasertechnik | Piston-cylinder unit |
EP2700816B1 (en) | 2012-08-24 | 2016-09-28 | LG Electronics Inc. | Reciprocating compressor |
DE102013113557A1 (en) * | 2013-12-05 | 2015-06-11 | Knorr-Bremse Systeme für Schienenfahrzeuge GmbH | Compressor system for a railway vehicle and method for operating the compressor system with a safe emergency operation |
DE102013113555A1 (en) | 2013-12-05 | 2015-06-11 | Knorr-Bremse Systeme für Schienenfahrzeuge GmbH | Compressor system and method for operating the compressor system depending on the operating state of the rail vehicle |
CN107313919A (en) * | 2016-04-27 | 2017-11-03 | 青岛海尔智能技术研发有限公司 | Linearkompressor |
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- 2009-01-28 EP EP09707314A patent/EP2240692A1/en not_active Withdrawn
- 2009-01-28 WO PCT/EP2009/050962 patent/WO2009098157A1/en active Application Filing
- 2009-01-28 RU RU2010135408/06A patent/RU2010135408A/en not_active Application Discontinuation
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Publication number | Priority date | Publication date | Assignee | Title |
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KR20150017352A (en) * | 2012-05-11 | 2015-02-16 | 에어로라스 게엠베하, 에어로슈타티쉐 라거- 레이저테크닉 | Piston/cylinder unit |
KR20190062622A (en) * | 2012-05-11 | 2019-06-05 | 에어로라스 게엠베하, 에어로슈타티쉐 라거- 레이저테크닉 | Piston/cylinder unit |
KR102003442B1 (en) * | 2012-05-11 | 2019-07-24 | 에어로라스 게엠베하, 에어로슈타티쉐 라거- 레이저테크닉 | Piston/cylinder unit |
KR102110300B1 (en) * | 2012-05-11 | 2020-05-14 | 에어로라스 게엠베하, 에어로슈타티쉐 라거- 레이저테크닉 | Piston/cylinder unit |
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US20180195502A1 (en) * | 2017-01-10 | 2018-07-12 | Lg Electronics Inc. | Linear compressor |
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US10968907B2 (en) * | 2017-01-10 | 2021-04-06 | LG Electronics Inc. and Industry-Academic Cooperation | Linear compressor |
Also Published As
Publication number | Publication date |
---|---|
WO2009098157A1 (en) | 2009-08-13 |
CN101939542A (en) | 2011-01-05 |
RU2010135408A (en) | 2012-03-20 |
DE102008007661A1 (en) | 2009-08-13 |
EP2240692A1 (en) | 2010-10-20 |
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