Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
  • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
  • F04B9/00—Piston machines or pumps characterised by the driving or driven means to or from their working members
  • F04B9/02—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being mechanical
• • 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
  • F04B25/00—Multi-stage pumps
  • F04B25/005—Multi-stage pumps with two cylinders
• • 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
  • F04B25/00—Multi-stage pumps
  • F04B25/02—Multi-stage pumps of stepped piston type
• • 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
  • F04B27/00—Multi-cylinder pumps specially adapted for elastic fluids and characterised by number or arrangement of cylinders
  • F04B27/02—Multi-cylinder pumps specially adapted for elastic fluids and characterised by number or arrangement of cylinders having cylinders arranged oppositely relative to main shaft
• • 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
  • F04B27/00—Multi-cylinder pumps specially adapted for elastic fluids and characterised by number or arrangement of cylinders
  • F04B27/04—Multi-cylinder pumps specially adapted for elastic fluids and characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement
  • F04B27/0404—Details, component parts specially adapted for such pumps
  • F04B27/0428—Arrangements for pressing or connecting the pistons against the actuated cam
• • 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
  • F04B39/0005—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 adaptations of pistons
• • 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
  • F04B39/0005—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 adaptations of pistons
  • F04B39/0022—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 adaptations of pistons piston rods
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
  • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
  • F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
  • F04B39/0094—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00 crankshaft
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
  • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
  • 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
  • F04B53/006—Crankshafts
• • 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
  • F04B53/14—Pistons, piston-rods or piston-rod connections
  • F04B53/144—Adaptation of piston-rods
• • 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
  • F04B53/144—Adaptation of piston-rods
  • F04B53/147—Mounting or detaching of piston rod

Definitions

• the present invention relates to the field of compressors, and more particularly to the field of axial double piston compressors.
• Compressors for compressing fluids typically comprise a piston, or a multitude of pistons, that move within a cylinder to compress the fluid.
• the pistons are operated by a connecting rod that is connected to a lower side of the piston by means of a piston pin, or a gudgeon pin, that is directed transversely to a piston axis.
• the piston pin passes through a ring at the small end of the piston rod such that the piston rod can rotate with respect to the piston pin.
• the pistons have a relatively large longitudinal extension in order to prevent tilting of the piston with respect to the longitudinal axis and possible sticking in within the cylinder.
• a big end of the connecting rod is freely connected to a crank that is driven by another mechanism, e.g., an electrical motor or an internal combustion engine.
• Such types of compressors suffer from a disadvantage that they are formed from a large number of parts, a fact that requires precisely produced parts, thus increasing their cost, and, a laborious assembly, which takes a lot of time and costs more. Furthermore, this structure creates large transverse force between the piston and the cylinder.
• the compressor according to the present invention acquires the following advantages: reduced number of parts, no need of exact precision between assembled parts, and no need of laborious assembly.
• the invention provides a compressing unit having an integral flexible pivot between a connecting rod and one piston. This is enabled due to relatively large length of the connecting rod with respect to a crank that is connected thereto.
• This construction enables to eliminate, or reduce to a minimum, any transverse forces exerted by the pistons on the cylinder.
• the longitudinal extension of the sliding surface of the pistons may be reduced to a minimum.
• a compressing unit including a cylinder, a first piston configured to slide along the cylinder, and a connecting rod attached to the first piston at a first end and to a crank at a second end.
• the crank is configured to be directly attached to a motor shaft.
• a length L of the connecting rod is substantially greater than an operating radius R of the crank.
• the length L of the connecting rod is at least five times greater than the operating radius R of the crank.
• the length L of the connecting rod is at least ten times greater than the operating radius R of the crank.
• the first end of the connecting rod includes an integral flexible pivot. Additionally, the integral flexible pivot is integral with the first piston.
• the first piston includes a sliding surface with a substantially reduced longitudinal extension in contact with the cylinder.
• the sliding surface may be integral with the first piston.
• the compressing unit includes a second piston configured to slide along the cylinder.
• the compressing unit includes a piston rod connecting the first piston to the second piston.
• the length L of the connecting rod is greater than half the length of the piston rod.
• the motor shaft includes an electric motor shaft.
• a method of producing a compressing unit including integrally.
• the connecting rod is integral with the first piston at a first end and connects to a crank at a second end.
• the crank is configured to be directly attached to a motor shaft.
• a length L of the connecting rod is substantially greater than an operating radius R of the crank.
• the method includes using injection molding to integrally mold the first piston with the flexible pivot and the connecting rod.
• the method includes integrally molding a piston rod with the first piston.
• the method includes integrally molding a second piston with the piston rod.
• a method of using a compressing unit includes rotating a crank connected directly to a motor shaft at a substantially high speed, translating rotational motion from the crank to linear motion using a connecting rod attached to a first piston at a first end and to a crank at a second end, and sliding the first piston forward and backward inside a cylinder.
• Fig. 1 is a side cross-sectional view of the compressing unit of a compressor according to the present invention
• Fig. 2 is a perspective view of the compressing unit of Fig. 1 according to the present invention.
• Fig. 3 is a side cross-sectional enlarged view of the crank of Fig. 1 according to the present invention.
• FIGs. 1 , 2 and 3 show a compressing unit 10 of a compressor 12 (that, for a matter of simplicity, is not shown as a whole) according to the present invention.
• the compressing unit 10 comprises an elongated cylinder 14 having a longitudinal axis A.
• a pair of pistons 16 is located within the cylinder 14 and are co-axial with the longitudinal axis A.
• the pistons 16 are connected therebetween by means of a piston rod 18.
• the piston rod 18 consists of a single piece.
• the piston rod 18 consists of two individual rods that connect between the two pistons 16.
• Each piston 16 comprises a front compressing surface 20, a rear surface 22, and, a sliding surface 24 which is in contact with the cylinder 14 and slides thereon.
• the sliding surface 24 of each piston 16 has a longitudinal extension of 1mm.
• the sealing portion between the pistons 16 and the cylinder 14 may be mounted on the sliding surfaces 24 of the pistons, or, may advantageously form an integral portion therewith.
• the compressing unit 10 is operated by means of an electric motor (not shown in the figures) that is located out of the cylinder 14 and directed perpendicularly to the longitudinal axis A.
• the shaft of the electric motor is connected directly into an electric motor shaft seating 26 of a crank 28.
• the crank 28 has a crank pin 30 that is inserted into a corresponding pin hole in a first end 32 of a connecting rod 34 that is adjacent a rear surface 22 of a first piston 36.
• the connecting rod 34 having a length L, is relatively large and extends almost to the entire length of the piston rod 18.
• a second end 38 of the connecting rod 34 is connected to the rear surface 22 of the second piston 40 through an integral flexible pivot 42.
• the connecting rod 34, the integral flexible pivot 42, the pistons 16 and the piston rod 18 are all formed from a single unitary piece that is formed by injection molding or other methods known in the art and which may include three- dimensional printing.
• the crank 28 has an operating radius R which is defined between an electric motor axis B and a crank pin axis C. Since the length L of the connecting rod 34 is much larger than the operating radius R of the crank 28, the rotation of the first end 32 of the connecting rod 34, together with the crank 28, around the electric motor axis B causes only a little rotational and translational movements of the second end 38 of the connecting rod 34 with respect to the rear surface 22 of the second piston 40. Thus, it is possible to form the connecting rod 34, the integral flexible pivot 42 and the piston 16, and also the piston rod 18 and the other piston 16, as a single unitary piece, thus enabling to reduce production and assembling costs, from one side, and enabling long service life of the integral flexible pivot 42, from another side.
• crank 28 Since the crank 28 is connected directly to the electric motor shaft, and not via a speed-reducing mechanism, various advantages are obtained: (1) the crank 28 rotates at a relatively very high speed thus creating fast compression action of the pistons 16 and compensation for the small stroke, (2) money saving, due to the unnecessary speed-reducing mechanism, (3) longer service life due to the lack of a need to use a speed-reducing mechanism, (4) much quieter action of the entire compressor due to the avoidance of using a speed- reducing mechanism.
• the compressing unit 10 operates efficiently with an alternating-stroke effect, i.e., when the first piston 36 makes a compression stroke, then, the second piston 40 makes a suction stroke, and, when the second piston 40 makes a compression stroke, then, the first piston 36 makes a suction stroke.
• the second end 38 of the connecting rod 34 does not have to be connected to the rear surface 22 of the second piston 40 through an integral flexible pivot 42.
• the second end 38 of the connecting rod 34 may be connected to the rear surface 22 of the second piston 40 through another type of joint that is not necessarily integral therewith.
• the second end 38 of the connecting rod 34 does not have to be connected to the rear surface 22 of the second piston 40 through an integral flexible pivot 42.
• the second end of the connecting rod may be connected to a connecting link that connects between the piston rods and is directed substantially perpendicular to the longitudinal axis A.
• the connecting link does not have to be connected to the rear surface of the piston.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Compressors, Vaccum Pumps And Other Relevant Systems (AREA)
• Compressor (AREA)
• Transmission Devices (AREA)

Priority Applications (5)

Applications Claiming Priority (2)

Publications (1)

Family

ID=60478083

Family Applications (1)

Country Status (6)

Citations (6)

Family Cites Families (12)

• 2017
  • 2017-05-15 RU RU2018144251A patent/RU2018144251A/ru not_active Application Discontinuation
  • 2017-05-15 EP EP17806014.1A patent/EP3458715A4/en not_active Withdrawn
  • 2017-05-15 JP JP2019513504A patent/JP2019516910A/ja active Pending
  • 2017-05-15 US US16/301,658 patent/US20190285061A1/en not_active Abandoned
  • 2017-05-15 WO PCT/IL2017/050534 patent/WO2017208222A1/en unknown
  • 2017-05-15 CN CN201780044021.5A patent/CN109477471A/zh active Pending

Patent Citations (6)

Non-Patent Citations (1)

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