EP0333667A2 - Compresseurs d'air - Google Patents

Compresseurs d'air Download PDF

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Publication number
EP0333667A2
EP0333667A2 EP89830054A EP89830054A EP0333667A2 EP 0333667 A2 EP0333667 A2 EP 0333667A2 EP 89830054 A EP89830054 A EP 89830054A EP 89830054 A EP89830054 A EP 89830054A EP 0333667 A2 EP0333667 A2 EP 0333667A2
Authority
EP
European Patent Office
Prior art keywords
air compressor
casing
piston
compressor according
drive shaft
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Withdrawn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
EP89830054A
Other languages
German (de)
English (en)
Other versions
EP0333667A3 (fr
Inventor
Gianfranco Prevosto (It)
Giovanni Stantero (It)
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.)
CHINOOK SpA
Original Assignee
CHINOOK SpA
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 CHINOOK SpA filed Critical CHINOOK SpA
Publication of EP0333667A2 publication Critical patent/EP0333667A2/fr
Publication of EP0333667A3 publication Critical patent/EP0333667A3/fr
Withdrawn legal-status Critical Current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
    • 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
    • F04B39/066—Cooling by ventilation
    • 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
    • F04B39/10—Adaptations or arrangements of distribution members
    • F04B39/1066—Valve plates

Definitions

  • the present invention relates in general to air compressors and is particularly concerned with some improvements which are applied to a compressor in order to improve its operating characteristics, particularly as regards the cooling and lubricating functions, and also to simplify the assembly of the compressor and the periodic replacement of some parts (piston rings) which are subject to wear in use.
  • a piston air compressor is intended to be used for producing compressed air in an industrial environment, or possibly for semi-professional amateur use.
  • the compressor 1 is composed essentially of a casing defining within it two cylinders 2 in which two pistons 3 are sealingly mounted for reciprocal sliding.
  • the pistons 3 are connected by means of connecting rods 4 to the journals of a crankshaft 5 having an end 6 which projects from the casing of the compressor.
  • a pulley 7 is mounted on the end of the shaft and has two grooves situated remote from and near to the compressor 1 respectively.
  • a belt 8 passes around the outer groove and enables the pulley 7 (and the shaft 5 as a whole) to be rotated by an electric operating motor (not illustrated). The function of the inner groove will be described further below.
  • a plate 9 is provided in correspondence with the tops of the cylinders 2 and, also according to a widely known arrangement, two pairs of blade valves are mounted therein for regulating the passage of air to and from the cylinders 2 through two intake and delivery ducts 10, 11 in the head 12 of the casing.
  • two intake valves 13 are provided which are mounted on the lower face of the plate 9 in corresponding recesses thereof and have the function of enabling the passage of air from the intake duct 10 to the cylinders 2 when the pistons 3 move - alternately - downwards as a result of the rotation of the shaft 5;
  • two delivery valves 14 are provided on the upper face of the plate 9 for enabling the passage of air from the cylinders 2 to the delivery duct 11 when the pistons 3 move - alternately - upwards in a respective cylinders 2 as a result of the rotation of the shaft 5.
  • the plate 9 on which the valves 13 and 14 are mounted (usually by means of driven rivets of a relatively ductile material such as copper) is constituted by a pressure-cast aluminium part traversed by three longitudinal apertures 16 which extend through the entire length of the plate 9 (in the direction of alignment of the cylinders 2).
  • the apertures 16 are intended to convey a ventilating air flow in order to facilitate the cooling of the head part of the compressor.
  • the ventilating air flow is generated by a fan 17 mounted on a shaft or pin 18 and rotated by the pulley 7 by means of a belt 19 which passes around the inner groove of the pulley 7.
  • the fan 17 is mounted on the shaft 18 with the interposition of a bearing 20; more precisely, the shaft 18 is constituted by an S-shaped pin provided with an eccentric central portion 21 which is fixed to the casing of the compressor by the screwing of a threaded end portion 22 into a bush provided in the casing of the compressor 1.
  • crankcase 25 is therefore closed in correspondence with its base wall and has a main opening which enables the insertion of the shaft 5 and its associated members during the assembly of the compressor and only opens upwards, that is, towards the overlying central part 24.
  • the lower part 25 of the casing is provided with a plurality of bosses 26 which project like pillars in the lower part 25 itself (usually six are provided - that is, at the four vertical corners of the part 25, which is generally parallelepipedal in shape, and centrally of its two longer sides).
  • the bosses or pillars 26 are provided with internal sets of threads (only one of which, indicated 27, is visible in Figure 1) for the insertion of respective screws 28 (two of which are shown schematically in Figure 1).
  • the screws 28 extend from the head 12 through the valve plate 9 (which is purposely provided with corresponding through-holes 29, shown in Figure 2) and through the central part 24 of the casing so as to be engaged in the threads 27 provided in the bosses 26 in the lower part 25 of the casing.
  • the front wall of the part 25, facing the pulley 7, also has a hole with a horizontal axis for the mounting of a bearing 30 for supporting the shaft 5, with which oil seal members 31 are associated.
  • Another hole with a horizontal axis is provided in a corresponding position on the rear wall of the lower part 25 of the casing and a further bearing 32 is mounted therein, usually by driving, for supporting the rear end of the shaft 5.
  • the hole in which the bearing 32 is mounted communicates with a lubricant (oil) drainage space or sump 33 provided at the top with a threaded hole 34 in which an oil drainage and collection plug 35 of the type described in European patent application EP-A-0 232 688 is mounted.
  • a duct with a horizontal axis, indicated 36, extends through the upper part of the sump 33 and opens into the lower part 25 of the casing.
  • the duct 36 enables the lubricant to be fed into the lower part 25 of the casing, which serves as a crankcase.
  • the duct 36 is closed by the threaded shank of the plug 35 when the latter is screwed into hole 34.
  • the lubricant fumes which are generated during the operation of the compressor are therefore discharged from the lower part 25 of the casing through the bearing 32 and the sump 33, until they reach the plug 35.
  • the lubricant which collects in the plug 35 as a result of the trapping action of the latter can thus fall back into the compressor casing to ensure optimum lubrication of the bearing 32.
  • two screw plugs 25a and 25b are inserted in corresponding threaded holes provided in the part 25 beneath the aperture into which the bearing 32 is driven.
  • the plug 25a is of transparent material and thus enables the level reached by the lubricant inside the part 25 to be checked.
  • the plug 25b is mounted close to the base wall of the part 25 and - when it is removed - enables all the lubricant to be drained out.
  • Two lubricant drainage ducts extend from the cylinders 2 to two corresponding drainage apertures provided at the upper end of the plug 35.
  • Each of the ducts 37 extends from an intake aperture 38 (only one of which is visible in Figure 1) provided in a respective annular groove 39 in the inner wall of the cylinder, centrally thereof.
  • the grooves 39 are formed in positions determined in dependence on the geometrical characteristics of the pistons 3.
  • Each of these is constituted essentially by two elements, that is to say, a lower portion 40 connected to the upper end of the corresponding connecting rod 4 by a pin 41, and an upper portion 42 which is fixed to the lower portion 40 by means of a screw 43.
  • the screw 43 extends generally axially of the piston 3 and is kept in position by a locking screw 44.
  • each piston 3 is tapered at the top so as to form a bevelled shoulder 45 which converges towards the top of the respective cylinder 2.
  • the upper or head portion 42 is generally cylindrical in shape, with a lower axial appendage 46 which is coupled in the manner of a tenon to the narrower top part of the lower portion 40.
  • Similar rings 48 are provided in the head portion 42.
  • the piston structure illustrated enables operation with oil-film lubrication in correspondence with the lower portions of the pistons 2 and operation virtually without lubrication in correspondence with the head portions. This solution minimises the contamination of the compressed air by the lubricating oil.
  • sealing rings 48 are mounted on a head portion 42 which can be separated from the rest of the piston considerably simplifies the periodic replacement of the rings 48 which are subject to wear during the use of the compressor.
  • the head portions 42 can be put back in the cylinders and fixed to the respective lower portions 40 by means of the screws 43 and the screws 44; the compressor can then be closed again by the fitting of the valve plate 9 and the head 12.
  • the rings 48 can thus be replaced without the need to remove the pistons completely from the cylinders, thus avoiding an operation which, in the majority of cases, would require the almost complete dismantling of the compressor 1.
  • the grooves 39 which are intended to act as traps for the collection and recovery of the lubricating oil 37, to prevent excessive migration of the lubricant towards the top parts of the cylinders 2, are formed so as to open into the annular space between the head portion 42 and the bevelled shoulder 45 of the lower portion 40 of the piston.
  • annular recesses 39 are formed so as to be slightly above the position reached by the lower end of the shoulder 45 when the piston 3 is in the top dead centre position.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Compressor (AREA)
EP89830054A 1988-02-17 1989-02-14 Compresseurs d'air Withdrawn EP0333667A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT6712288 1988-02-17
IT67122/88A IT1219027B (it) 1988-02-17 1988-02-17 Perfezionamenti nei compressori d'aria

Publications (2)

Publication Number Publication Date
EP0333667A2 true EP0333667A2 (fr) 1989-09-20
EP0333667A3 EP0333667A3 (fr) 1989-12-13

Family

ID=11299773

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89830054A Withdrawn EP0333667A3 (fr) 1988-02-17 1989-02-14 Compresseurs d'air

Country Status (2)

Country Link
EP (1) EP0333667A3 (fr)
IT (1) IT1219027B (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT402089B (de) * 1991-01-02 1997-01-27 Hoerbiger Ventilwerke Ag Ventilsitzplatte für kolbenkompressoren
ITTO20100990A1 (it) * 2010-12-13 2012-06-14 Nu Air Compressors And Tools S P A Unita' di alimentazione di aria compressa
KR101390184B1 (ko) * 2012-12-03 2014-04-29 주식회사코핸즈 공랭효과가 향상된 공기압축기용 실린더헤드
CN104653438A (zh) * 2014-12-31 2015-05-27 东莞瑞柯电子科技股份有限公司 一种高效散热的直驱空压机

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114412784B (zh) * 2022-01-18 2023-12-01 江苏新凯晟机械设备有限公司 一种冷却调节式空压机

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR557006A (fr) * 1922-10-04 1923-08-01 Perfectionnements aux appareils compresseurs de fluides élastiques
GB273958A (en) * 1926-11-30 1927-07-14 Westinghouse Air Brake Co Improvements in or relating to fluid compressors
FR789561A (fr) * 1934-06-29 1935-10-31 Meaf Mach En Apparaten Fab Nv Presse-étoupe pour compresseurs de frigorifiques
US2243541A (en) * 1939-08-02 1941-05-27 Gen Refrigeration Corp Compound compressor
US2399571A (en) * 1944-10-09 1946-04-30 Albert M Porter Circulating compressor
GB719558A (en) * 1948-10-01 1954-12-01 Friedrich Heinreich Flottmann Improvements in and relating to air-cooled compressors
CH334057A (de) * 1955-09-23 1958-11-15 Sulzer Ag Kolbenkompressor
FR1257735A (fr) * 1960-02-23 1961-04-07 Perfectionnements apportés aux dispositifs de refroidissement des compresseurs d'air
GB1202615A (en) * 1968-02-29 1970-08-19 Zwickauer Maschinenfabrik Veb Improvements in or relating to air cooled piston compressors

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR557006A (fr) * 1922-10-04 1923-08-01 Perfectionnements aux appareils compresseurs de fluides élastiques
GB273958A (en) * 1926-11-30 1927-07-14 Westinghouse Air Brake Co Improvements in or relating to fluid compressors
FR789561A (fr) * 1934-06-29 1935-10-31 Meaf Mach En Apparaten Fab Nv Presse-étoupe pour compresseurs de frigorifiques
US2243541A (en) * 1939-08-02 1941-05-27 Gen Refrigeration Corp Compound compressor
US2399571A (en) * 1944-10-09 1946-04-30 Albert M Porter Circulating compressor
GB719558A (en) * 1948-10-01 1954-12-01 Friedrich Heinreich Flottmann Improvements in and relating to air-cooled compressors
CH334057A (de) * 1955-09-23 1958-11-15 Sulzer Ag Kolbenkompressor
FR1257735A (fr) * 1960-02-23 1961-04-07 Perfectionnements apportés aux dispositifs de refroidissement des compresseurs d'air
GB1202615A (en) * 1968-02-29 1970-08-19 Zwickauer Maschinenfabrik Veb Improvements in or relating to air cooled piston compressors

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT402089B (de) * 1991-01-02 1997-01-27 Hoerbiger Ventilwerke Ag Ventilsitzplatte für kolbenkompressoren
ITTO20100990A1 (it) * 2010-12-13 2012-06-14 Nu Air Compressors And Tools S P A Unita' di alimentazione di aria compressa
WO2012080955A1 (fr) * 2010-12-13 2012-06-21 Nu Air Compressors And Tools S.P.A. Unité d'alimentation en air comprimé
KR101390184B1 (ko) * 2012-12-03 2014-04-29 주식회사코핸즈 공랭효과가 향상된 공기압축기용 실린더헤드
CN104653438A (zh) * 2014-12-31 2015-05-27 东莞瑞柯电子科技股份有限公司 一种高效散热的直驱空压机

Also Published As

Publication number Publication date
IT8867122A0 (it) 1988-02-17
EP0333667A3 (fr) 1989-12-13
IT1219027B (it) 1990-04-24

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