Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
  • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
  • F04C19/00—Rotary-piston pumps with fluid ring or the like, specially adapted for elastic fluids
  • F04C19/002—Rotary-piston pumps with fluid ring or the like, specially adapted for elastic fluids with rotating outer members
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
  • F01C—ROTARY-PISTON OR OSCILLATING-PISTON MACHINES OR ENGINES
  • F01C17/00—Arrangements for drive of co-operating members, e.g. for rotary piston and casing
  • F01C17/02—Arrangements for drive of co-operating members, e.g. for rotary piston and casing of toothed-gearing type
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
  • F01C—ROTARY-PISTON OR OSCILLATING-PISTON MACHINES OR ENGINES
  • F01C21/00—Component parts, details or accessories not provided for in groups F01C1/00 - F01C20/00
  • F01C21/08—Rotary pistons
  • F01C21/0809—Construction of vanes or vane holders
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
  • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
  • F04C19/00—Rotary-piston pumps with fluid ring or the like, specially adapted for elastic fluids
  • F04C19/004—Details concerning the operating liquid, e.g. nature, separation, cooling, cleaning, control of the supply
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
  • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
  • F04C19/00—Rotary-piston pumps with fluid ring or the like, specially adapted for elastic fluids
  • F04C19/005—Details concerning the admission or discharge
  • F04C19/008—Port members in the form of conical or cylindrical pieces situated in the centre of the impeller
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
  • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
  • F04C7/00—Rotary-piston machines or pumps with fluid ring or the like
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
  • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
  • F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
  • F04C29/04—Heating; Cooling; Heat insulation
  • F04C29/042—Heating; Cooling; Heat insulation by injecting a fluid

Definitions

• the present invention relates to Liquid Ring Compressors (LRCs) and more specifically to an LRC with a rotating casing.
• LRCs Liquid Ring Compressors
• U.S. Patent 5,636,523 discloses an LRC and expander having a rotating jacket, the teaching of which is incorporated herein by reference.
• a liquid ring rotating casing compressor comprising a shaft; an impeller having a core and a plurality of radially extending vanes rotatably coupled to said shaft, a tubular casing having an inner surface and an outer surface eccentrically rotatably disposed with said impeller, disc-shaped portions laterally coupled to said vanes and/or to said core; said casing defining with said impeller a compression zone wherein edges of said vanes rotate in increasing proximity to an inner surface of the casing and an expansion zone wherein edges of said vanes rotate in increasing spaced-apart relationship along an inner surface of the casing, an inlet port communicating with said expansion zone, an outlet port communicating with said compression zone, and a drive for imparting rotating motion to said casing.
• Fig. 1 is an isometric, partly exposed view, of the LRRCC, according to the present invention
• Fig. 2 is an isometric view of an impeller for the LRRCC, according to the present invention
• Fig. 3 is a cross-sectional view of the LRRCC along line III-III of Fig. 1, according to the present invention
• Fig. 4 is a cross-sectional view along line IV-IV of Fig. 3. Detailed Description of Preferred Embodiments
• FIG. 1 An isometric, partly exposed view of the LRRCC 2 according to the present invention is shown in Fig. 1.
• the compressor 2 having a general cylindrical shape, is composed of three major parts: an inner impeller 4 mounted on a shaft 6 and a casing 8, configured as a curved surface of a cylinder.
• the shaft 6 is stationary and advantageously hollow, and the impeller 4 is rotatably coupled thereon, as seen in detail in Fig. 3.
• the impeller 4 shown in Fig. 2 consists of a plurality of radially extending vanes 10 mounted about a core 14, and of ring-shaped side walls 12, having concentric inner edges 16 and outer edges 16'.
• the vanes 10 terminate shorter than the outer edges 16 for reasons that will be discussed hereinafter.
• Fig. 1 the casing 8 eccentrically rotatably coupled with the impeller 4 and extending across the outer edges of the vanes 10 between the side walls 12.
• the casing 8 is mechanically coupled to the impeller 4.
• the impeller 4 is fitted with lateral rings 18 having internal teeth 20, configured to mesh with outer teeth 22 made on rings 24, which are attached to the outer sides of the side walls 12.
• the impeller 4 will rotate about the shaft 6 at a constant velocity with respect to the velocity of the casing 8.
• the velocity of the casing 8 should be greater than 70% of the velocity of the impeller 4.
• a compression zone Z com where the edges of the vanes 10 are disposed and rotate in increasing proximity to the inner surface of the casing 8
• an expansion zone Z ex where the edges of the vanes 10 are disposed and rotate in increasing spaced-apart relationship along an inner surface of the casing 8.
• bearings 26 coupling the impeller 4 on the shaft 6, the hollow shaft inlet portion 6[ n and an outlet portion 6 0Ut separated from the inlet portion ⁇ m by a partition 28.
• the casing 8 is driven by an outside drive means such as a motor (not shown), coupled to the casing by any suitable means such as belts, gears, or the like.
• a casing, drive coupling means 30 mounted on the shaft 6 via bearings 32.
• the drive coupling means 30 may be provided on any lateral side of the casing 8, on both sides (as shown), or alternatively, the casing 8 may be driven by means provided on its outer surface.
• the ribs 34 are provided for guiding driving belts (not shown) leading to a motor.
• the radial liquid flow near the border between the compression zone Z com and expansion zone Z ex is associated with high liquid velocity variations between the vanes 10 and the casing 8.
• This tangential velocity variation is dissipative.
• the ends of the vanes 10 are shorter as compared with the impeller's side walls 12. In this way, the distance between the ends of the vanes 10 and the casing 8 increases, the dissipative velocity is reduced and the efficiency increases.
• shaft work is converted to heat.
• cold fluid can be introduced into the compression zone Z com , thus heat will be extracted from the compression zone by the cold liquid.
• the compressed gas will be colder, further increasing the compressor's efficiency, as less shaft work is required to compress cold gas than hot gas.
• the fluid (usually cold water) should be atomized and sprayed directly into the compression zone Z com .
• the droplet average diameter by volume should advantageously be smaller than 200 microns.
• the liquid mass flow ml (kg/s) should be comparable to the air mass flow, say ml>ma/3.
• Fig. 4 there are illustrated spray nozzles 36 formed in the core 14 about which the vanes 10 are mounted. As can be seen, the spray nozzles 36 may be formed on the partition 28, so as to direct atomized fluid in two directions.
• the waves are associated with leakage of compressed air to the expanding zone Z ex , which is dissipative in nature.
• the wave's amplitude and with it, the leakage increases with distance between two neighboring vanes.
• the vane numbers should be larger than 10.
• the leakage air will expand at the expanding zone Z ex .
• the vanes 10 should be close to the central shaft 6, so that the interval between the vanes and the duct will be small and the angle ⁇ between the narrow point Tec and the opening to the low pressure inlet Te exceeds 1 A radian.

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• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Structures Of Non-Positive Displacement Pumps (AREA)

Priority Applications (5)

Applications Claiming Priority (2)

Related Child Applications (3)

Publications (1)

Family

ID=36933489

Family Applications (1)

Country Status (6)

Cited By (5)

Families Citing this family (7)

Citations (7)

Family Cites Families (11)

• 2005
  • 2005-06-15 IL IL169162A patent/IL169162A/en not_active IP Right Cessation
• 2006
  • 2006-06-12 CN CN2006800212653A patent/CN101198792B/zh not_active Expired - Fee Related
  • 2006-06-12 WO PCT/IL2006/000680 patent/WO2006134590A1/en not_active Ceased
  • 2006-06-12 US US11/917,153 patent/US9181948B2/en active Active
  • 2006-06-12 EP EP06745142A patent/EP1896726A1/en not_active Withdrawn
  • 2006-06-12 JP JP2008516499A patent/JP2008544141A/ja active Pending
• 2014
  • 2014-09-22 US US14/492,325 patent/US9556871B2/en not_active Expired - Fee Related

Patent Citations (7)

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