EP0272229A1 - Motor-Kolbenverdichtereinheit - Google Patents

Motor-Kolbenverdichtereinheit Download PDF

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Publication number
EP0272229A1
EP0272229A1 EP19870850245 EP87850245A EP0272229A1 EP 0272229 A1 EP0272229 A1 EP 0272229A1 EP 19870850245 EP19870850245 EP 19870850245 EP 87850245 A EP87850245 A EP 87850245A EP 0272229 A1 EP0272229 A1 EP 0272229A1
Authority
EP
European Patent Office
Prior art keywords
piston
air
crank
case
stator
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP19870850245
Other languages
English (en)
French (fr)
Inventor
Walter Leslie Chamberlain
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Lyntex Ltd
Original Assignee
Lyntex Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Lyntex Ltd filed Critical Lyntex Ltd
Publication of EP0272229A1 publication Critical patent/EP0272229A1/de
Withdrawn legal-status Critical Current

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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
    • 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
    • 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
    • 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
    • F04B39/0016—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 with valve arranged in the piston

Definitions

  • THIS INVENTION relates to a motor-compressor set suffic­iently small and light to be capable of being carried by one person, and able to provide clean compressed air at a pressure of up to 1000 Kpa.
  • Compressor technology is nowadays at a sophisticated level.
  • many compressors are static installations or rely on oil lubrication for their operation. This prevents them being applied in the many fields of the present invention which calls for a light, relatively efficient source of clean cool compressed air.
  • An object of this invention is the provision of an improved motor-compressor set.
  • a motor-compressor set for supplying a stream of cool, compressed air at pressures up to 1000 Kpa and uncontaminated by dust or oil, comprises a compressor crank-case having two central apert­ures one of which is screened by an inlet air filter and the other of which supports one end of a stator of an electric motor which has its drive shaft extending into the crank-­case to a mechanism which converts rotational movement of the rotor into reciprocation of two aligned and rigidly connected, opposed piston heads working in respective cylinders disposed on diametrically-opposite sides of the motor shaft, each piston being surrounded by a flexible, friction-resistant sealing washer which seals against the cylinder during the compression stroke of the piston but allows air to flow past it during the aspiration stroke of the piston, the major part of the area of the piston being occupied by a disc closure of a poppet valve mounted in the piston head and which opens during the aspiration stoke of the piston, to allow parallel streams of air from the central zone of
  • the above invention relies on a combination of features which, together give the motor-compressor set the sought-for characteristics.
  • the mounting of the motor stator in one end of the crank-case reduces the weight and size of the set, while increasing its rigidity and robustness. It also assists cooling of the motor by the crank-case providing a heat sump for the motor stator at one end.
  • the large air inlet ensures a minimum air pressure drop for air entering the crank-case, and the use of a filter ensures that dust is filtered from the incoming air. Once the air is inside the central zone of the crank-case, it flows past and through the aspirating piston head.
  • crank-case poppet valve opens providing a large annular orifice through which air is pumped from the cylinder.
  • the discs of the poppet valves at each end of the crank-case are very close to one another at the top dead-centre position of the piston head, almost all the air is driven from the cylinder during the comp­ression stoke and the large outlet orifice, provided by the edge of the crank-case valve disc, minimises the pressure drop at this point to improve still further the efficiency of the motor-compressed set.
  • each of the rims of the poppet valves is of frusto-conical shape and seals against a complementary sealing surface when the valve is closed. This produces a large orifice through the open valve defined between the two opposed frusto-conical surfaces which separate during open­ing movement of the poppet valve.
  • the motor cooling circuit provides two separate streams of cooling air.
  • One stream flows around the outside of the stator and out through an orifice adjacent the crank- case.
  • the other stream is sucked from the interior of the crank-case by a second fan on the motor shaft, and flows via the rotor-stator gap to the fan which directs it through holes in the stator laminations opening into the outlet orifice adjacent the crank-case.
  • the two streams merge in the orifice and may be directed past cooling fins on the crank-case to maintain the outsides of the cylinders cool.
  • Figure 1 shows a motor-compressor set 1 driven by an electric motor 2 having drive shaft 3 which extends into a crank-case 4 of an air compressor 5.
  • the compressor 5 is designed to provide 5 1/Sec of clean air per minute, unpolluted by oil vapour or droplets, up to a pressure of 1000Kpa per square inch.
  • the motor is a 1120 watt electric motor having a shaft drive speed of 1428 revolutions per minute.
  • the compression ratio of the compressor is six to one.
  • the total weight of the unit is currently 22kg and its dimensions are: length 350 mm; width 200 mm; height 370 mm.
  • the motor is designed to be portable and may be provided with a handle (not shown).
  • the shaft 3 carries a rotor (not shown) mounted within a laminated stator 6 held in position by being keyed at one end into a central circular aperture 11 provided centrally in one wall of the crank-case 4.
  • End covers 7 and 8 are respectively provided at opposite ends of the stator 6 and support bearings for the shaft 3. One of these bearings is shown at 10.
  • the stator 6 is mounted within a cowl 12 attached to the crank-case and containing an air entry 13 at one end through which air is sucked by a first fan 14 attached to one end-­portion of the shaft 3 protruding through the cover 7.
  • This fan drives air around the outside of the stator laminations to maintain them cool, the air discharging through an annular outlet orifice formed between the outside of the crank case and the adjacent end of the cowl 12.
  • the shaft 3 carries a second fan 16 inside the cover 7 and which draws air from the interior of the crank-case 4 by way of a central opening 9 in the cover 8 and the rotor-stator gap of the motor.
  • the fan 16 forces the air through axially extending holes (not shown) in the stator which open out­wardly into the discharge orifice 15.
  • the air discharged from the orifice 15 flows past cooling fins on the outside of the crank-case to assist its cooling, as shown.
  • crank-case 4 is formed, diametrically opposite the motor cover 8, with a second central circular aperture 17 cont­aining a removable air filter 18 through which air enters the interior of the crank-case 4.
  • crank-case 4 provides two lineraly opposed co-axial cylinders 20, 21.
  • a piston assembly 22 has at its opposite ends respective piston heads 23, 24 which reciprocate in the cylinders, respectively, and are inter­connected by an articulated frame 25.
  • a mechanism driven by the shaft 3 reciprocates the frame in the direction of the axis of the cylinders.
  • the mechanism for converting the rotational movement of the shaft 3 into reciprocating movement of the pistons comprises an eccentric crank 26 mounted on the end of the shaft 3 and fitting within a ball-race 27.
  • the outside of the race 27 is formed by a big end 28 of a connecting rod 30 which is connected at its little end by a transverse gudgeon pin 31 to the frame 25.
  • Rotation of the shaft 3 reciprocates the rod 30 back and forth, and this movement is transferred by the gudgeon pin 31 to the frame 26 and piston heads.
  • the gudgeon pin 31 is able to rotate about its axis to accomm­odate the sideways throw of the big end 28 on the crank 26.
  • the rims of the piston heads 23, 24 are spaced radially inwardly of the inside walls of the cylinders and each is provided with a radially-flexible, friction-resistant, annular cup washer 32 made from a reinforced plastics material of high thermal capacity and available in Australa under the Trade Mark UNASCO 808.
  • the washer 32 has a 'feathered' upper edge. The washer 32 slides against the inside wall of the cylinder which is case hardened by anodising and "Teflon" coated, to make an air-tight seal therewith during the compression stroke of the piston.
  • the washer lies against the side rim of the piston to leave an annular orifice through which air from the central zone of the crank-case can flow into the cylinder.
  • This air flow assists cooling of the cylinder walls which is important as no lubricating oil is used, and too high a temperature of the cylinder lining could soften and damage the washer 32.
  • the bulk of the area of the piston head 23 is formed by a closure disc 33 of a poppet valve.
  • the valve has a stem 34 which passes through a gland 35 in the piston head.
  • the piston head is provided with a set of through ports, not shown, arranged around the gland 35 and beneath the poppet disc 33.
  • the edge of the disc 33 is bevelled and mates with a complem­entary bevelled valve seat provided in the piston, when the valve is closed.
  • the compression of the air in the cylinder during the compression stroke of the piston head 23 holds the valve closed.
  • the poppet valve opens to allow air to flow through the valve ports and peripheral orifice of the valve, into the compression chamber of the cylinder.
  • crank-case The ends of the crank-case are closed by cylinder heads 40, 41.
  • Each contains a poppet valve 42 having a closure disc 43 provided with a bevelled edge, and a stem 44 which passes through a gland 45. The movement of the disc in the valve­opening direction is limited by a nut 47 on the stem 44.
  • the marginal edge of the disc 43 is bevelled to provide it with a frusto-conical peripheral edge.
  • An annular air-­outlet orifice in the cylinder head 40 is formed between the edge of the disc and a complementary frusto-conical seat 50 formed in the head 40. This orifice is closed and opened by the movement of the poppet valve, and provides a compressed air outlet of relatively large cross-section and therefore relatively little impedance. The outlet leads to a comp­ressed air discharge connector 51.
  • the piston head 23 and the opposite face of the disc 43 almost touch one another when the piston head is in its top dead-centre postion. This ensures that almost all of the compressed air in the cylinder is discharged through the discharge connection 51.
  • the cylinders 20, 21 are lined preferably with hardened aluminium and the sealing washers 32 on the piston heads are made preferably from a reinforced plastics material and which is relatively friction-resistant. This does not need lubrication when running on hardened aluminium.
  • Figures 3 and 4 show a modification of the piston assembly used in the crank case 4.
  • the rotational drive of the motor shaft 3 is converted into reciprocating movement of the piston heads by a mechanism which comprises a balanced eccentric 55 to which is bolted a ball race 56 seating inside one part of a two-part slider, 57, 58.
  • the piston assembly comprises a flattened bar 60 having a piston head 61 at each end.
  • a rectangular slot 62 extends through the centre of the bar 60 and a plastics cylindrical surface 63 on the slider, having a low co-efficient of friction, is shaped to it within but being slidable along the slot by having its outside diameter substantially equal to the width of the slot 62.
  • Figure 4 shows one of the pistons 61. Its rim is provided with a flexible sealing washer 64 corresponding in function to the sealing washer 32 shown in figure 2.
  • the ends of the bar 60 are formed with rectangular windows 66 from each of which an annular bush 67 extends through the end of the adjacent piston head 61.
  • a stem 68 of a poppet valve 69 is slidable axially in the bush 67 and its movement in the valve-opening direction is limited by a nut 70 located in the window 66.
  • a closure disc 71 on the poppet valve 69 has a bevelled edge 72 which seals against a complementary frusto-conical seat on the piston head when the valve is closed.
  • Four ports 73 allow air to pass through the piston head 61 from the interior of the crank-case 4 and into a cavity 75 located between the valve disc 71 and the piston 61.
  • Figure 5 shows an alternative mechanism to that shown in figure 2 for reciprocating the piston assembly. Parts corresponding in function to similar parts of figure 2, are correspondingly referenced but in the hundred series.
  • the distinction between the mechanisms shown in figures 2 and 5 is that the latter mechanism uses an eccentric disc keyed to the motor shaft 3, to drive the connecting rod of the piston assembly, instead of the crank 26.
  • the sides of the frame 125 are provided with respective aligned and parallel slots which allows the shaft 3 to pass through the frame 125 while it is reciprocating.
  • the piston heads are not shown in figure 5 but are attached to opposite ends of the frame 125 and the stems of their poppet valves (also not shown) pass through the hole 101 provided at each end of the frame 125.
  • the rotational drive of the electric motor is converted into a reciprocating drive by a mechanism inside the crank-case and used to reciprocate the piston assembly.
  • Air is continuously drawn in through the filter 18 and flows in two streams respectively past and through the piston head performing its aspiration stroke.
  • the low pressure prevailing in the cylinder chamber at this time holds the outlet poppet valve closed.
  • a second part of the air stream entering the crank case flows through the orifice 9 and around the rotor before being discharged via the orifice 15 to atmosphere.
  • the piston head poppet valve closes and the cylinder head poppet valve opens.
  • the sealing washer around the piston head expands to seal against the cylinder wall so that virtually all of the air trapped in the cylinder chamber is pumped out through the discharge connector 51.
  • the motor is maintained cool during its operation, partly by the air sucked from within the crank-case, and partly by the second stream of air circulated around the outside of the stator 6 by the fan 14. Cooling of the crank-case is effected by the flows of air from the orifice 15 on the outside, and travelling past the outsides of the piston heads during their aspiration strokes.
  • Figures 6, 7 and 8 illustrate the external appearance of the motor-compressor set, generally referenced as in Figures 1 and 2.
  • the set has a carrying handle 76 and is mounted on feet 77.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Compressor (AREA)
  • Compressors, Vaccum Pumps And Other Relevant Systems (AREA)
EP19870850245 1986-12-19 1987-08-14 Motor-Kolbenverdichtereinheit Withdrawn EP0272229A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AU9582/86 1986-12-19
AU958286 1986-12-19

Publications (1)

Publication Number Publication Date
EP0272229A1 true EP0272229A1 (de) 1988-06-22

Family

ID=3700343

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19870850245 Withdrawn EP0272229A1 (de) 1986-12-19 1987-08-14 Motor-Kolbenverdichtereinheit

Country Status (2)

Country Link
EP (1) EP0272229A1 (de)
JP (1) JPS63162981A (de)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4955796A (en) * 1988-09-21 1990-09-11 Bristol Compressors, Inc. Refrigerant gas compressor construction
EP0459052A1 (de) * 1990-06-01 1991-12-04 Bristol Compressors Inc. Kältemittelkompressorkonstruktion
EP0661452A1 (de) * 1993-12-27 1995-07-05 BÜHLER & HOHL ENGINEERING AG Kompressor oder Vakuumpumpe
CN110513270A (zh) * 2019-09-29 2019-11-29 湖南省瑞柯电子科技有限公司 一种空压机机芯
CN111622918A (zh) * 2020-07-02 2020-09-04 衢州职业技术学院 一种自抵消振动型空压机

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4230601B2 (ja) * 1999-03-26 2009-02-25 株式会社日立製作所 空気圧縮機
JP4875683B2 (ja) * 2008-10-14 2012-02-15 株式会社日立産機システム 空気圧縮機
JP4448196B2 (ja) * 2009-12-14 2010-04-07 株式会社日立製作所 空気圧縮機

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1295529A (en) * 1919-02-25 James W Lawhead Air-compressor.
DE817013C (de) * 1948-10-02 1951-10-15 Willy Bayer Ungesteuertes Einlassventil fuer Kolbenluftpumpe
DE2821389A1 (de) * 1977-05-17 1978-11-30 Marco Grillini Kolbenverdichter
US4190402A (en) * 1975-05-06 1980-02-26 International Telephone And Telegraph Corporation Integrated high capacity compressor
DE3211318A1 (de) * 1981-03-31 1982-10-28 Grenco S.p.A., Torino Luftkompressoraggregat
WO1983003640A1 (en) * 1982-04-19 1983-10-27 Pettyjohn, Austin, E. Portable air compressor
EP0127585A2 (de) * 1983-03-11 1984-12-05 AIREL ITALIANA S.r.l. Luftkompressor mit gegenüber liegenden Verdichtungskammern

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1295529A (en) * 1919-02-25 James W Lawhead Air-compressor.
DE817013C (de) * 1948-10-02 1951-10-15 Willy Bayer Ungesteuertes Einlassventil fuer Kolbenluftpumpe
US4190402A (en) * 1975-05-06 1980-02-26 International Telephone And Telegraph Corporation Integrated high capacity compressor
DE2821389A1 (de) * 1977-05-17 1978-11-30 Marco Grillini Kolbenverdichter
DE3211318A1 (de) * 1981-03-31 1982-10-28 Grenco S.p.A., Torino Luftkompressoraggregat
WO1983003640A1 (en) * 1982-04-19 1983-10-27 Pettyjohn, Austin, E. Portable air compressor
EP0127585A2 (de) * 1983-03-11 1984-12-05 AIREL ITALIANA S.r.l. Luftkompressor mit gegenüber liegenden Verdichtungskammern

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4955796A (en) * 1988-09-21 1990-09-11 Bristol Compressors, Inc. Refrigerant gas compressor construction
US5106278A (en) * 1988-09-21 1992-04-21 Bristol Compressors, Inc. Refrigerant gas compressor construction
EP0459052A1 (de) * 1990-06-01 1991-12-04 Bristol Compressors Inc. Kältemittelkompressorkonstruktion
EP0661452A1 (de) * 1993-12-27 1995-07-05 BÜHLER & HOHL ENGINEERING AG Kompressor oder Vakuumpumpe
CN110513270A (zh) * 2019-09-29 2019-11-29 湖南省瑞柯电子科技有限公司 一种空压机机芯
CN110513270B (zh) * 2019-09-29 2024-07-05 湖南省瑞柯电子科技有限公司 一种空压机机芯
CN111622918A (zh) * 2020-07-02 2020-09-04 衢州职业技术学院 一种自抵消振动型空压机

Also Published As

Publication number Publication date
JPS63162981A (ja) 1988-07-06

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Inventor name: CHAMBERLAIN, WALTER LESLIE