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EP0069845B1 - Radialkolbenverdichter - Google Patents

Radialkolbenverdichter Download PDF

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Publication number
EP0069845B1
EP0069845B1 EP82104321A EP82104321A EP0069845B1 EP 0069845 B1 EP0069845 B1 EP 0069845B1 EP 82104321 A EP82104321 A EP 82104321A EP 82104321 A EP82104321 A EP 82104321A EP 0069845 B1 EP0069845 B1 EP 0069845B1
Authority
EP
European Patent Office
Prior art keywords
cylinder block
pressure
gap
fixed shaft
suction
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.)
Expired
Application number
EP82104321A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0069845A3 (en
EP0069845A2 (de
Inventor
Siegfried Schönwald
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.)
Siemens AG
Original Assignee
Siemens AG
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 Siemens AG filed Critical Siemens AG
Priority to AT82104321T priority Critical patent/ATE29769T1/de
Publication of EP0069845A2 publication Critical patent/EP0069845A2/de
Publication of EP0069845A3 publication Critical patent/EP0069845A3/de
Application granted granted Critical
Publication of EP0069845B1 publication Critical patent/EP0069845B1/de
Expired 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
    • F04B27/00—Multi-cylinder pumps specially adapted for elastic fluids and characterised by number or arrangement of cylinders
    • F04B27/04—Multi-cylinder pumps specially adapted for elastic fluids and characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement
    • F04B27/0404—Details, component parts specially adapted for such pumps
    • F04B27/0423—Cylinders
    • 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
    • F04B27/04—Multi-cylinder pumps specially adapted for elastic fluids and characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement
    • F04B27/0404—Details, component parts specially adapted for such pumps
    • F04B27/0451—Particularities relating to the distribution members
    • F04B27/0456—Particularities relating to the distribution members to cylindrical distribution members
    • 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
    • F04B27/04—Multi-cylinder pumps specially adapted for elastic fluids and characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement
    • F04B27/06—Multi-cylinder pumps specially adapted for elastic fluids and characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement the cylinders being movable, e.g. rotary
    • F04B27/0606—Multi-cylinder pumps specially adapted for elastic fluids and characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement the cylinders being movable, e.g. rotary having cylinders in star- or fan-arrangement, the connection of the pistons with an actuating element being at the outer ends of the cylinders
    • F04B27/0612—Multi-cylinder pumps specially adapted for elastic fluids and characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement the cylinders being movable, e.g. rotary having cylinders in star- or fan-arrangement, the connection of the pistons with an actuating element being at the outer ends of the cylinders rotary cylinder block
    • F04B27/0619—Multi-cylinder pumps specially adapted for elastic fluids and characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement the cylinders being movable, e.g. rotary having cylinders in star- or fan-arrangement, the connection of the pistons with an actuating element being at the outer ends of the cylinders rotary cylinder block cylinder block and actuating cam rotating together

Definitions

  • the invention relates to a radial piston compressor, with pistons which can be moved radially back and forth in the piston chambers of a cylinder block rotatably mounted on a fixed axis, the radial movement of which is controlled by a rotatable guide part arranged with its axis of rotation eccentrically to the axis of rotation of the cylinder block, in the region of which from the cylinder block on the fixed axis covered area each a suction and pressure slot extending over a partial circumference of the fixed axis is provided and oil is introduced into the gap existing between the cylinder block and the fixed axis, in which the individual piston spaces in their the fixed Axis adjacent floor have an opening that is at least on the bottom side facing the axis in the same plane as the suction and pressure slot.
  • Such a radial piston compressor is known from DE-C-2710734.
  • oil is also sucked in when the medium to be compressed is sucked in, which also passes between the cylinder block and the fixed axis via the opening in the bottom of the piston chambers and seals gaps present here. It has now been shown that the sealing effect of the oil thus obtained between the cylinder block and the fixed axis is unsatisfactory.
  • the compressed gas displaces the oil and blows it out of the gap between the cylinder block and the fixed axis.
  • the invention has for its object to design a radial piston compressor of the type described above so that a perfect seal is achieved by the oil located between the cylinder block and the fixed axis.
  • the object is achieved in a radial piston compressor in which the cylinder block is mounted on the fixed axis by means of a roller bearing according to the invention in that the gap has a cross section which decreases in the direction from the suction slot to the pressure slot and the oil is targeted in the area of the largest Gap cross-section is introduced into the gap, the decreasing gap cross-section being achieved in that the roller bearing is arranged eccentrically with respect to the fixed axis, or in that in the fixed axis at least one groove is provided on both sides of the suction slot, at a distance from the suction slot, at a distance from the same , which extends in the circumferential direction approximately from the beginning of the suction slot at least to the end of the pressure slot and whose depth and / or width decreases from the suction slot to the pressure slot.
  • the oil Due to its viscosity, the oil is carried away by the rotating cylinder block.
  • the reduction in the gap cross-section at least at one point leads to an increase in the pressure acting on the oil, which can be made equal or greater than the pressure increase of the gas to be compressed by appropriately dimensioning the cross-sectional reduction. Since the oil located between the cylinder block and the fixed axle is now under high pressure, it can no longer be blown out of the gap by the gas to be compressed.
  • the reduction in the gap is determined by the design. If the compressor works with different gas pressures, the reduction in cross-section of the gap must be dimensioned such that the hydrodynamically generated oil pressure corresponds approximately to the highest occurring compressor pressure of the gas. If the compressor works with low compression pressures, however, the oil penetrates against the gas due to the higher pressure and flows off to the piston chambers. The oil entering the piston chambers is pushed out together with the gas at the end of the compression stroke, which can lead to oil strikes. In order to prevent the oil from penetrating into the piston chambers, an automatic adjustment of the respective oil pressure to the compression pressure is necessary.
  • perfect sealing by the oil located between the cylinder block and the fixed axis at changing compression pressure is achieved in that the gap has a cross-section that decreases in the direction from the suction slot to the pressure slot and the oil is targeted in the area of the largest gap cross-section in the Gap is introduced, the decreasing gap cross-section being achieved in that the surface covered by the cylinder block is formed on the fixed axis as a bearing surface on which the cylinder block is directly rotatably supported, the effective load-bearing area B - D of the cylinder block being 0.8 to 1.3.
  • a / sin 7-c where B corresponds to the effective z total width of the gap between the cylinder block and the fixed axis, D the diameter of the gap, A the cross-sectional area of a piston and Z the number of pistons lying in a radial plane and is at least equal to 2.
  • the radial load of the cylinder block averaged over the circumference as the reaction force of the piston forces is approximately proportional to the compression pressure of the gas. Under this radial load, the cylinder block adjusts to the fixed axis in such a way that the pressure force that builds up hydrodynamically in the gap between the cylinder block and the fixed axis is in equilibrium with this radial load.
  • At least one channel is provided on both sides of the suction slot, the cross-section of which is larger than the largest possible cross-section of the gap existing between the cylinder block and the fixed axis, and into the front end in the direction of its rotation Oil is introduced.
  • the oil pressure is raised somewhat above the suction pressure towards the end of the suction slot.
  • the oil pressure then increases towards the pressure slot in proportion to the compression pressure.
  • An increase in the oil pressure in the channel is achieved in that the channel has a reduced cross section towards the end of the suction slot.
  • the sealing effect of the oil films, both between the fixed axis and the rotating cylinder block and between the pistons and the walls of the piston chambers can be further improved in that the cylinder block and the fixed axis are arranged in a closed, pressure-resistant housing and the pressure in the housing lies between the suction pressure and the compression pressure of the compressor.
  • a pressure equilibrium is established in such a closed housing under the effect of gap losses flowing in on the compression side and on the suction side.
  • a certain pressure is required in the housing in order to minimize the gap and ventilation losses.
  • Such a pressure can be set in the housing in a simple manner in that a passage opening into the housing space is provided on the fixed axis in the peripheral region lying between the suction and pressure slot. The passage is arranged in the peripheral area at the point where the desired pressure prevails in the piston spaces.
  • the bell is expediently attached to the laminated core of the external rotor. Little assembly effort results from the fact that the bell is made in one piece with the short-circuit ring of the external rotor. Since such a bell has a smooth surface, only slight friction losses occur, so that the ventilation losses are also reduced by such a bell.
  • the radial piston compressor consists of a cylinder block 2 rotatably arranged on a fixed axis 1.
  • a plurality of cylindrical piston chambers 3 are formed on the cylinder block 2, evenly distributed over its circumference.
  • a freely movable piston 4 is arranged in each piston chamber 3.
  • the pistons 4 consist of a cup-shaped support part 5, into which a ball 6 is inserted, which rolls on a guide ring 7.
  • the guide ring 7 is carried by a guide part 8, which is mounted eccentrically on the fixed axis 1 with respect to the cylinder block 2.
  • an external rotor motor is provided as the drive motor 11, the inner stand 9 of which is fixed on the fixed axis 1.
  • the outer rotor 10 is coupled to the cylinder block 2 via arms 13 connected at the end to the relevant short-circuit ring 12. That formed from the radial piston compressor and the drive motor 11 te compressor unit is inserted into a pressure-resistant housing 14.
  • the fixed axis 1 is hollow and serves as a feed channel 15 for the gas to be compressed.
  • the feed channel 15 is connected to the suction slot 17 of the radial piston compressor.
  • the surface covered by the cylinder block 2 on the fixed axis 1 is designed as a bearing surface 19.
  • the cylinder block 2 is mounted directly on this bearing surface 19 by means of a ring 21 on which the individual cylinders 20 are arranged.
  • the ring 21 simultaneously forms the bottom of the piston chambers 3.
  • a bore channel 24 extending up to its lower end is also formed.
  • Two cross bores 25 are connected to this bore channel. These cross bores 25 extend to the bearing surface 19 and are covered by the ring 21. Via the bore channel 24, oil is supplied by means of a pump, which passes through the transverse bores 25 between the bearing surface 19 and the ring 21 of the cylinder block 2.
  • FIG. 2 shows the surface 26 of the fixed axis 1 covered by the cylinder block 2 in one development.
  • the suction slot 17 extends almost to the bottom dead center UT.
  • the pressure slot 18 is much shorter and ends at the top dead center OT.
  • the gas is compressed on the route between the suction and pressure slots 17 and 18.
  • a groove 27 is formed on both sides of the suction slot 17, which extends beyond the pressure slot 18.
  • the cross section of the groove 27 is reduced by two width gradations 28 and, as the sectional illustration according to FIG. 3 shows, by several depth gradations 29.
  • the oil introduced into the groove 27 through the transverse bore 25 is carried along by the cylinder block 2.
  • the oil is exposed to an ever higher pressure, which corresponds approximately to the compression pressure built up between the suction and pressure slots 17 and 18, or even higher if the groove cross-section is appropriately dimensioned is the compression pressure of the gas.
  • the provision of the described grooves 27 on both sides of the suction slot 17 and the pressure slot 18 is particularly advantageous in a radial piston compressor in which the cylinder block 2 is mounted on the fixed axis 1 by means of a roller bearing.
  • a groove 30 is formed on both sides of the suction opening 17 in the fixed axis 1.
  • the cross bores 25 connected to the bore channel 24 in turn open into the two channels 30.
  • B. a depth gradation 31 and run at its end, as can be seen from Fig. 5, in a slope 32.
  • the reduction in cross-section of the channel 30 caused by the depth gradation 31 and / or the bevel 32 again leads to an increase in the pressure of the oil introduced into the channel 30 via the transverse bore 25.
  • the grooves 30 only extend approximately to the end of the suction slot 17.
  • An increase in the oil pressure at the end of the groove 30 is also achieved when the cross-sectional reduction is not made within the groove 30, but rather the cross-section of the gap between the cylinder block 2 and the fixed axis 1 following the channel 30 is smaller than the channel cross section. Since the cylinder block 2 is mounted directly on the bearing surface 19, an eccentric adjustment of the cylinder block relative to the bearing surface 19 takes place due to the compression pressure prevailing in the piston chambers. This eccentric adjustment results in a ring between the ring 21 of the cylinder block 2 and the bearing surface 19 Width decreasing from the suction slot 17 to the pressure slot 18. In the channels 30 with reduced cross-section, the oil pressure is already raised slightly above the suction pressure of the gas towards the end of the suction slot 17. As a result of the gap narrowing further towards the pressure slot 18, the oil pressure and the compression pressure of the gas in the piston chambers 3 increase continuously.
  • a transverse slot 33 is formed in the bearing surface 19, which extends at least to below the opening 22 in the bottom of the piston spaces 3.
  • a connection between the transverse slot 33 and the outer space surrounding the compressor is established via an axial bore 34.
  • a satisfactory seal between the cylinder block 2 and the bearing surface 19 is achieved by an increase in the oil pressure in the gap between the cylinder block 2 and the bearing surface 19 corresponding to the increase in the compression pressure between the suction and the pressure slots 17 and 18.
  • the increase in the oil pressure can be brought about by various measures. If the cylinder block 2 is mounted on the fixed axis by means of a roller bearing, then the Suction slot 17 grooves 27 are provided, the cross section of which is reduced towards the pressure slot 18. As a result of this reduction in cross section, there is an increase in pressure for the oil entrained by the cylinder block 2.
  • the rolling bearing and the formation of the grooves 27 define both the dimensions of the gap between the cylinder block 2 and the surface 26 of the fixed axis 1 which it covers, and the reduction in cross section of the grooves 27. Accordingly, the same oil pressure is always generated regardless of the respective compression pressure. By appropriately designing the cross section of the grooves 27, this oil pressure can be dimensioned such that it is above the highest compression pressure. If the compressor works with low compression pressures, there is a risk that the oil will penetrate into the piston chambers 3.
  • a pressure between the intake pressure and the compression pressure is established in the pressure-resistant housing 14 enclosing the compression unit. Since gases which have a higher specific weight than air are often compressed in such radial piston compressors, the ventilation losses also increase sharply with the increased pressure in the pressure-resistant housing 14.
  • a bell 35 is attached to the outer rotor 10 of the drive motor 11, which bell covers the cylinder block 2 at least partially.
  • the gas located in the interior of the bell 35 is set in rotation and has only a low relative speed in relation to the cylinder block 2, which also rotates, so that there are only slight losses of potential.
  • only slight ventilation losses occur on the smooth outside of the bell 35 compared to the gas in the pressure-resistant housing 14.
  • the bell 35 can be produced together with the short-circuit ring 12 and the arms 13 in one operation. If the wall of the bell 35 is inclined slightly outwards towards the open end of the bell, such a bell can be used to separate contaminants present in the oil. The oil emerging from the gap between the cylinder block 2 and the bearing surface 19 drips or splashes into the bell 35. The centrifugal force caused by the rotation of the bell 35 allows the oil to flow off on the outwardly inclined wall of the bell 35 towards its open end . On the other hand, the impurities that are heavier than the oil stick to the bell wall. The cleaning effect can be improved further by appropriately designing the bell wall, for example applying a rough covering or one or more circumferential grooves.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Compressor (AREA)
  • Compressors, Vaccum Pumps And Other Relevant Systems (AREA)
EP82104321A 1981-05-25 1982-05-17 Radialkolbenverdichter Expired EP0069845B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT82104321T ATE29769T1 (de) 1981-05-25 1982-05-17 Radialkolbenverdichter.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3120812A DE3120812C2 (de) 1981-05-25 1981-05-25 Radialkolbenverdichter
DE3120812 1981-05-25

Publications (3)

Publication Number Publication Date
EP0069845A2 EP0069845A2 (de) 1983-01-19
EP0069845A3 EP0069845A3 (en) 1984-02-22
EP0069845B1 true EP0069845B1 (de) 1987-09-16

Family

ID=6133195

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82104321A Expired EP0069845B1 (de) 1981-05-25 1982-05-17 Radialkolbenverdichter

Country Status (7)

Country Link
US (1) US4465436A (da)
EP (1) EP0069845B1 (da)
JP (1) JPS57200688A (da)
AT (1) ATE29769T1 (da)
DE (2) DE3120812C2 (da)
DK (1) DK151146C (da)
IE (1) IE53119B1 (da)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3316106A1 (de) * 1983-05-03 1984-11-08 Siemens AG, 1000 Berlin und 8000 München Radialkolbenverdichter
DE3431158A1 (de) * 1984-08-24 1986-03-06 Alfred Teves Gmbh, 6000 Frankfurt Radialkolbenmaschine, insbesondere kugelkolbenpumpe
JPH0631633B2 (ja) * 1987-08-12 1994-04-27 株式会社ユニシアジェックス タ−ビン型燃料ポンプ
US5979440A (en) 1997-06-16 1999-11-09 Sequal Technologies, Inc. Methods and apparatus to generate liquid ambulatory oxygen from an oxygen concentrator
US7204249B1 (en) * 1997-10-01 2007-04-17 Invcare Corporation Oxygen conserving device utilizing a radial multi-stage compressor for high-pressure mobile storage
US5988165A (en) * 1997-10-01 1999-11-23 Invacare Corporation Apparatus and method for forming oxygen-enriched gas and compression thereof for high-pressure mobile storage utilization
US8062003B2 (en) * 2005-09-21 2011-11-22 Invacare Corporation System and method for providing oxygen
AU2010284357A1 (en) * 2009-08-17 2012-03-08 Invacare Corporation Compressor
WO2013116820A1 (en) 2012-02-03 2013-08-08 Invacare Corporation Pumping device
DE102017128095A1 (de) * 2017-11-28 2019-05-29 Hoerbiger Automotive Komfortsysteme Gmbh Hydraulisches System

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1888860A (en) * 1927-07-26 1932-11-22 Arthur J Kercher Compressor
US1846360A (en) * 1928-01-27 1932-02-23 Walter H Rudolph Compressor
US1939057A (en) * 1930-02-24 1933-12-12 Arthur J Kercher Compressor
DE720485C (de) * 1936-10-07 1942-05-07 Gustav Stromeier Foerdereinrichtung fuer Fluessigkeiten
US2515033A (en) * 1948-05-25 1950-07-11 Connor Arthur Albert Reciprocating pump and compressor
US3037457A (en) * 1959-08-26 1962-06-05 Gen Electric Pumps
US3357361A (en) * 1965-10-21 1967-12-12 Bendix Corp High velocity pump
DE2239757A1 (de) * 1972-08-12 1974-02-21 Bosch Gmbh Robert Radialkolbenmaschine
DE2248312C3 (de) * 1972-10-02 1978-07-06 Robert Bosch Gmbh, 700 Stuttgart Hydrostatische Radialkolbenmaschine
DE2710734B2 (de) * 1977-03-11 1979-02-08 Siemens Ag, 1000 Berlin Und 8000 Muenchen Verdichteraggregat, bestehend aus einem Antriebsmotor und einem Verdichter mit exzentrisch geführten, frei beweglichen Kolben
DE2832017A1 (de) * 1978-07-20 1980-01-31 Siemens Ag Verdichteraggregat, bestehend aus einem antriebsmotor und einem radialkolbenverdichter
CH638590A5 (de) * 1979-02-26 1983-09-30 Sulzer Ag Hydrostatische kolbenmaschine.

Also Published As

Publication number Publication date
IE821236L (en) 1982-11-25
DK151146C (da) 1988-07-18
DK232082A (da) 1982-11-26
JPS57200688A (en) 1982-12-08
US4465436A (en) 1984-08-14
DE3120812C2 (de) 1984-04-19
IE53119B1 (en) 1988-07-06
ATE29769T1 (de) 1987-10-15
DE3277321D1 (de) 1987-10-22
EP0069845A3 (en) 1984-02-22
DE3120812A1 (de) 1982-12-23
EP0069845A2 (de) 1983-01-19
DK151146B (da) 1987-11-09

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