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US4529365: Compressor with longitudinally extending cooling fins

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Filing Information

Inventor(s) Peter Schutt · Klaus Nitsche · Horst Grindler · Hans-Joachim Hofmann ·
Assignee(s) Durr-Dental GmbH & Co., KG ·
Attorney/Agent(s) Robert E. Burns ·
Primary Examiner William L. Freeh ·
Assistant Examiner Paul F. Neils ·
Application Number US6555436
Filing date 11/25/1983
Issue date 07/16/1985
Predicted expiration date 07/16/2002
U.S. Classifications 417/313  · 417/368  ·
International Classifications F04B 3906  ·
Kind CodeA
International Classifications 417313;368;415;560;571 ·
Related U.S. Application DataThis application is a continuation of Ser. No. 06/297,360 filed 8-28-81 and now abandoned.
Foreign Priority DE3032518 - 08/29/1980 ·
17 Claims, No Drawings


Abstract

An oil-less gas compressor comprises at least one cylinder block mounted on a crankcase, the outer end of the cylinder block being closed by a cylinder head. A piston in the cylinder block bore is reciprocated by a motor-driven crankshaft in the crankcase. The cylinder blocks and cylinder heads are generally square in cross section. On all four sides of the cylinder block and cylinder head there are spaced cooling fins which extend in an axial direction. Axially extending cooling air passages between the fins communicated at their lower ends with the interior of the crankcase. Air drawn into the crankcase by a fan on the crank shaft flows into and through these cooling air passages to cool the cylinder block and head. In one corner portion of the cylinder block and head there is an integral axially extending suction bore containing a filter. In an adjacent corner portion of the cylinder block there is an axially extending compressed air bore. In the other two corner portions there are tubular air passages which likewise communicate with the interior of the crankcase.

Independent Claims | See all claims (17)

  1. 1. A compressor comprising a crankcase, a motor driven crankshaft rotatable in said crankcase, a cylinder block mounted on said crankcase with a cylinder bore perpendicular to the axis of rotation of said crankshaft, a cylinder head mounted on an outer end of said cylinder block to close the outer end of said cylinder bore, through bolts securing said cylinder block to said crankcase and securing said cylinder head to said cylinder block, inlet and outlet valve means associated with said cylinder head and a piston reciprocable in said cylinder bore by said crankshaft, said cylinder block and cylinder head having around their periphery means defining an array of aligned cooling air passages extending axially of said cylinder block and cylinder head, said cooling air passages comprising outwardly open spaces between peripherally spaced cooling fins that extend axially of said cylinder block and cylinder head and further comprising aligned, peripherally spaced, axially extending tubular openings through which said through bolts extend and are screwed into tapped holes in said crankcase to secure said cylinder head and cylinder block to said crankcase, said crankcase having cooling air inlet means, air blower means in said crankcase and driven by said crankshaft for drawing cooling air through said cooling inlet means into said crankcase, said crankcase further having an opening over which said cylinder block is mounted, said opening being of a size and shape to open not only into said cylinder bore but also into said axially extending cooling air passages of said cylinder block, whereby cooling air drawn into said crankcase by said blower means flows from said crankcase into and through said axially extending cooling air passages of said cylinder block and cylinder head to cool said cylinder block and cylinder head.
  2. 2. A compressor comprising a crankcase, a crankshaft rotatable in said crankcase, a motor at one end of the crankcase connected to said crankshaft for driving said crankshaft, an inlet air opening in an opposite end of said crankcase, a fan on said crankshaft inwardly of said air inlet opening to draw air through said inlet opening into the crankcase, said crankcase having an opening intermediate its ends for the mounting of a cylinder block, a cylinder block mounted on said crankcase over said intermediate opening of said crankcase, a piston reciprocable in said cylinder bore by said crankshaft, a cylinder head closing an outer end of said cylinder block, inlet and outlet valve means associated with said cylinder head, said cylinder block and cylinder head being generally square in cross section and having around their periphery an array of axially extending passages comprising axially extending bores in corner portions of the cylinder block and spaces between axially extending fins on sides of said cylinder block between corners, said passages comprising passages through which through bolts extend to secure said cylinder head and cylinder block to said crankcase and air cooling passages communicating at their inner ends through said intermediate opening with the interior of said crankcase to receive from said crankcase air drawn into said crankcase by said fan.
  3. 3. A compressor comprising a crankcase, a crankshaft rotatable in said crankcase, a motor at one end of the crankcase connected to said crankshaft for driving said crankshaft, inlet air openings in an opposite end of said crankcase, a fan on said crankshaft inwardly of said air inlet openings to draw air through said inlet openings into crankcase, said crankcase having an opening intermediate its ends for the mounting of a cylinder block, a cylinder block mounted on said crankcase over said intermediate opening with a cylinder bore opening into said intermediate opening of said crankcase, a piston reciprocable in said cylinder bore by said crankshaft, a cylinder head closing an outer end of said cylinder block, inlet and outlet valve means associated with said cylinder head, said cylinder block being generally square in cross section and formed with a plurality of axially extending cooling air passages surrounding said cylinder bore, said axially extending cooling air passages comprising axially extending bores in corner portions of said cylinder block and spaces between axially extending fins on sides of said cylinder block between corners thereof, and said cylinder head being formed with cooling air passages aligned with the axially extending cooling air passages of said cylinder block, through bolts extending through at least three of said axially extending cooling air passages of said cylinder block and cylinder head, spaced circumferentially from one another and screwed into tapped holes in said crankcase to secure said cylinder head and cylinder block to said crankcase, said axially extending cooling air passages communicating at their inner ends through said intermediate opening with the interior of said crankcase to receive from said crankcase air drawn into said crankcase by said fan.
  4. 6. A compressor comprising a crankcase, a motor driven crankshaft rotatable in said crankcase, a cylinder block mounted on said crankcase with a cylinder bore perpendicular to the axis of rotation of said crank shaft, a cylinder head mounted on an outer end of said cylinder block to close the outer end of said cylinder bore, inlet and outlet valve means associated with said cylinder head and a piston reciprocable in said cylinder bore by said crankshaft, said cylinder block having around its periphery means integral with said cylinder block defining an array of cooling air passages extending axially of said cylinder block, said crankcase having cooling air inlet means, air blower means in said crankcase and driven by said crankshaft for drawing cooling air through said cooling air inlet means into said crankcase, said crankcase further having an opening over which said cylinder block is mounted, said opening being of a size and shape to open not only into said cylinder bore but also into said axially extending cooling air passages of said cylinder block, whereby cooling air drawn into said crankcase by said blower means flows from said crankcase into and through said axially extending cooling air passages of said cylinder block to cool said cylinder block, said cylinder head and cylinder block having therein a suction bore which extends axially of said cylinder block, has an air inlet at its outer end and communicates through connecting means and said inlet valve means with said cylinder bore.
  5. 8. A compressor according to calim 6, in which said inlet valve means comprises a two-layer read valve plate between said cylinder head and cylinder block and reed valves mounted thereon, said reed valve plate comprising a lower steel plate and an upper plate of packing material, an inlet reed valve being mounted on the upper face of the upper layer and an outlet reed valve being mounted on the upper face of the lower layer.
  6. 10. A compressor comprising a crankcase, a motor-driven crankshaft rotatable in said crankcase, at least one cylinder block mounted on said crankcase with a cylinder bore perpendicular to the axis of rotation of said crankshaft, a cylinder head closing an outer end of said cylinder block, inlet and outlet valve means associated with said cylinder head, and a piston reciprocable in said cylinder bore by said crankshaft, said cylinder block having around its perimeter an array of cooling air passages extending axially of said cylinder block, a suction bore integral in said cylinder block extending axially of said cylinder block and communicating through connecting means and said inlet valve means with said cylinder bore, a compressed air bore integral in said cylinder block extending axially of said cylinder block and communicating through connecting means and said outlet valve means with said cylinder bore, said cylinder block being generally square in a cross section perpendicular to the axis of said cylinder bore, and said suction bore being integral in one corner portion of said cylinder block, said compressed air bore being integral in another corner portion of said cylinder block and said cooling air passages comprising cooling air bores in the other two corner portions of said cylinder block.
  7. 15. A compressor comprising a crankcase, a motor driven crankshaft rotatable in said crankcase, a cylinder block mounted on said crankcase with a cylinder bore perpendicular to the axis of rotation of said crankshaft, a cylinder head mounted on an outer end of said cylinder block to close the outer end of said cylinder bore, inlet and outlet valve means associated with said cylinder head and a piston reciprocable in said cylinder bore by said crankshaft, said cylinder block having around its periphery means integral with said cylinder block defining an array of cooling air passage extending axially of said cylinder block, said crankcase having cooling air inlet means, air blower means in said crankcase and driven by said crankshaft for drawing cooling air through said cooling iar inlet means into said crankcase, said crankcase further having an opening over which said cylinder block is mounted, said opening being of a size and shape to open not only into said cylinder bore but also into said axially extending cooling air passages of said cylinder block, whereby cooling air drawn into said crankcase by said blower means flows from said crankcase into and through said axially extending cooling air passages of said cylinder block to cool said cylinder block said cylinder block having a compressed air bore integral in said cylinder block which extends axially of said cylinder block and communicates through connecting means and said outlet valve means with said cylinder bore, and said crankcase having a compressed air chamber formed integrally inside said crankcase and communicating with said compressed air bore of said cylinder block.

References Cited

U.S. Patent Documents

Document NumberAssigneesInventorsIssue/Pub Date
US2134077 WESTINGHOUSE ELECTRIC & MFG CO Ehret Oct 1938
US2605044 TOKHEIM OIL TANK AND PUMP COMP Hill Jul 1952
US2899130 Sykes Aug 1959
US3145914 WORTHINGTON CORP Nicholas Aug 1964
US3375972 ZEFEX INC Raufeisen Apr 1968
US3521607 CONTINENTAL MOTORS CORP Wiseman et al. Jul 1970
US4190402 International Telephone and Telegraph Corporation Meece et al. Feb 1980
US4350475 International Telephone and Telegraph Corporation Meece et al. Sep 1982

Foreign Patent Documents

Document NumberAssigneesInventorsIssue/Pub Date
DE1255390DAIMLER BENZ AGNov 1967
DE3046434BOGE KOMPRESSORENJul 1982
GB160575ARTHUR JOHN BOHRINGERMar 1921
GB216157MARCEL PRETOTNov 1924
GB456502RHEINMETALL BORSIG AG WERK BORNov 1936

Patent Family

Document NumberAssigneeInventorsIssue/Pub Date
DE3032518 DUERR DENTAL GMBH CO KG SCHUETT PETER DR ING et al. May 1982
US4529365 Durr-Dental GmbH & Co., KG Peter Schutt et al. Jul 1985