Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
  • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
  • F02B33/00—Engines characterised by provision of pumps for charging or scavenging
  • F02B33/32—Engines with pumps other than of reciprocating-piston type
  • F02B33/34—Engines with pumps other than of reciprocating-piston type with rotary pumps
  • F02B33/36—Engines with pumps other than of reciprocating-piston type with rotary pumps of positive-displacement type
  • F02B33/38—Engines with pumps other than of reciprocating-piston type with rotary pumps of positive-displacement type of Roots type
• • 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
  • F04C18/00—Rotary-piston pumps specially adapted for elastic fluids
  • F04C18/08—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
  • F04C18/082—Details specially related to intermeshing engagement type pumps
  • F04C18/084—Toothed wheels
• • 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
  • F04C18/00—Rotary-piston pumps specially adapted for elastic fluids
  • F04C18/08—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
  • F04C18/12—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type
  • F04C18/14—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons
  • F04C18/16—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons with helical teeth, e.g. chevron-shaped, screw type
• • 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
  • F04C18/00—Rotary-piston pumps specially adapted for elastic fluids
  • F04C18/08—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
  • F04C18/12—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type
  • F04C18/14—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons
  • F04C18/18—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons with similar tooth forms
• • 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
  • F04C2240/00—Components
  • F04C2240/60—Shafts

Definitions

• the present invention relates to a screw compressor, especially adapted for use as a super charger for an internal combustion engine, which compressor is of the type mentioned in the preamble of the following claim 1.
• Screw compressors are known in many shapes as compressors, expanders, pumps, motors, etc. Common to these machines is the fact, that the rotors in one and the same machine are of two types, a male rotor and a female rotor. The both types of rotors have lobes or lands with a helix angle of about 250°. The lobes of the male rotor are broad, whereas the lobes of the female rotor are thin, in recent constructions even so thin that the machining of the lobes has become difficult, due to the fact that lobes have a tendency to yield under the influence of a pressure.
• the manufacturing of the rotors of a machine is complicated and necessitates a set of tools to each kind of rotor. Moreover, the rotors are designed to rotate only in the direction of rotation to which the rotors are dimensioned.
• the object of the invention is to achieve a screw compressor which is rugged and uncomplicated to manufacture in comparison with known screw compressors.
• the screw compressor has obtained the subject matter defined in the characterizing clause of claim 1, namely that the rotor bores are of equal diameter, and the rotors are quite alike and have a symmetrical profile with identically uniform cross sections.
• FIG. 1 is a side view of the screw compressor housing
• Figure 2 is a longitudinal sectional view of the housing right between the rotor bores
• Figure 3 is a longitudinal sectional view of the housing seen in a plane through the centre axis of the rotor bores
• Figure 4a is an end view of the two rotors in meshing relationship
• Figure 4b is a perspective view of said rotors
• Figure 5a is a side view of the rotors
• Figure 5b is a longitudinal sectional view through the two intermeshing rotors
• Figure 6 is a perspective view of a typical pair of rotors, known per se.
• Figure 1 shows the screw compressor adapted for super-charging of an internal combustion engine.
• the compressor has a housing 1 enclosing two rotors, which housing has a rear end wall 2, in which inlet channels are located, and a front end wall 3, in which rotor synchronizing gears are journalled in a manner known per se, and in which is journalled a driving shaft provided with an outside belt pulley 4 for driving the compressor by a belt driven by the engine.
• Fig.6 showing a known pair of rotors with a typical male rotor 21 and a known female rotor 22 provided with lobes 23 similar to leaves.
• a pair of rotors is efficient, but the female rotor 22 becomes weak, and the lobes 23 are difficult to machine due to the fact that the lobes are yielding at the required pressure stress.
• the invention is of course not limited to the embodiment shown and described here by way of example but can be modified in different ways within the scope of the invention defined by the patent claims. It is possible, for instance, to use more than two rotors in a screw compressor and more or less than four lobes on each rotor.
• the screw compressor according to the invention may also be adapted for other purposes than compressing, as mentioned earlier.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Chemical & Material Sciences (AREA)
• Combustion & Propulsion (AREA)
• Supercharger (AREA)
• Applications Or Details Of Rotary Compressors (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=39356795

Family Applications (1)

Country Status (2)

Cited By (1)

Citations (3)

• 2007
  • 2007-01-15 SE SE0700079A patent/SE530359C2/sv unknown
• 2008
  • 2008-01-14 WO PCT/SE2008/000026 patent/WO2008088269A1/en active Application Filing

Patent Citations (3)

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