EP0907022A2 - Device for avoiding disturbing back expansion in a piston compressor - Google Patents

Device for avoiding disturbing back expansion in a piston compressor Download PDF

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Publication number
EP0907022A2
EP0907022A2 EP98117617A EP98117617A EP0907022A2 EP 0907022 A2 EP0907022 A2 EP 0907022A2 EP 98117617 A EP98117617 A EP 98117617A EP 98117617 A EP98117617 A EP 98117617A EP 0907022 A2 EP0907022 A2 EP 0907022A2
Authority
EP
European Patent Office
Prior art keywords
valve
piston
connecting rod
cam
piston crown
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Withdrawn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
EP98117617A
Other languages
German (de)
French (fr)
Other versions
EP0907022A3 (en
Inventor
Heribert Dipl.-Ing. Möller (FH)
Manfred Dipl.-Ing. Pister (Fh)
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.)
MAN Truck and Bus SE
Original Assignee
MAN Nutzfahrzeuge 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 MAN Nutzfahrzeuge AG filed Critical MAN Nutzfahrzeuge AG
Publication of EP0907022A2 publication Critical patent/EP0907022A2/en
Publication of EP0907022A3 publication Critical patent/EP0907022A3/en
Withdrawn legal-status Critical Current

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    • 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

  • the invention relates to a device according to the preamble of the claim 1.
  • the invention has for its object a device for avoiding To design back expansion so that one with the least possible construction effort gets along.
  • a piston compressor essentially consists of a cylinder 1, a Crankcase 2, a piston 3, and a crankshaft 4 with a connecting rod 5.
  • An uncomfortable The characteristic of the piston compressor is that it has negative torques has, which therefore stir that after exceeding the piston in the OT a Back expansion occurs. This causes gears when the compressor is driven very unpleasant gear noise due to flanking. To do this It is necessary to avoid the compression space between piston 3 and one To connect the cylinder head base 6 to the atmosphere via the crankcase 2.
  • valve 7 which is in a piston crown 8 is arranged.
  • This valve 7 is actuated by a cam 9, which itself on a cam disk 10, or also directly on a connecting rod eye 11 of the Connecting rod 5 is located.
  • the cam disk 10 is connected in a rotationally fixed manner to the connecting rod eye 11.
  • the function is to be said that the movement of the valve 7 from the pivoting movement of the connecting rod 5 is derived. This leads to the pivoting movement of the connecting rod 5
  • Connecting rod eye 11 makes a rotary movement which is based on the rotation of the cam disk 10 and the cam 9 located thereon to raise the valve 7 in the area the TDC position of the piston 3 leads. Through this opening of the valve 7 in Compression room relaxes compressed air, so that a back expansion with the associated negative consequences are avoided.
  • Fig. 2 shows in detail an embodiment of the valve 7.
  • the valve 7 consists of a Valve plate 12 and the associated valve stem 13.
  • the valve plate 12 is by a compression spring 14 against a valve seat incorporated in the piston crown 15 pressed with holes 16.
  • the compression spring 14 is supported against the piston crown 8 and a spring plate 17, which is connected to the valve stem 13.
  • the valve 7 via the connecting rod eye 11 rotatably connected cam 10 with cam 9 raised.
  • the in Compression room air is blown off through the holes 16, and thus avoiding re-expansion.
  • FIG. 3 Another embodiment of the valve 7 is shown in FIG. 3.
  • a membrane 19 is provided, which by means of rivets 20 is anchored to the piston crown 8.
  • the membrane 19 closes the bore 16. If air is now to be blown off in the TDC position of the piston 3 (FIG. 1), then the Diaphragm 19 through the valve stem 13 by means of the cam 9 against the restoring force the compression spring 14 is raised and air escapes through the bore 16 in the piston crown 8, so that back expansion is avoided.
  • the device according to the invention can be used in series production Piston compressor only by installing valve 7 and attaching one Cam 10 on the connecting rod head 11 converted to a low-noise operation become.

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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)

Abstract

The compression chamber is connected to the atmosphere via a valve (7) located in the piston head (8). The valve is lifted by a cam (9) fastened to the eye (11) of a connecting rod (5). The valve has a shaft and a plate, which is pressed by a compression spring against a valve seat with bores in the piston head. The spring supports itself against the piston head and against a spring plate fastened to the valve shaft.

Description

Die Erfindung bezieht sich auf eine Vorrichtung gemäß dem Gattungsbegriff des Patentanspruches 1.The invention relates to a device according to the preamble of the claim 1.

Zur Vermeidung negativer Drehmomente als Folge von Rückexpansion ist es bekannt, bei Kolbenverdichtern die Möglichkeit vorzuseher, daß im Bereich von OT-Stellung des Kolbens der Verdichtungsraum mit der Atmosphare verbunden wird. Zu diesem Zweck werden im Zylinder über den Umfang verteilte Axialnuten vorgesehen, welche in der Nahe des OT den Verdichtungsraum über eine Ringnut im Kolben und einen Hohlraum im Kolben zum Druckausgleich mit der Umgebung verbinden. Eine derartige Vorrichtung zur Vermeidung der Rückexpansion hat den Nachteil, daß an einem bestehenden Verdichter erhebliche bauliche Veränderungen vorgenommen werden müssen. ( DE 39 02 658 A1)To avoid negative torques as a result of back expansion, it is known with piston compressors, the possibility to foresee that in the area of TDC position the piston the compression chamber is connected to the atmosphere. To this Purpose are provided in the cylinder over the circumference distributed axial grooves near the TDC the compression chamber via an annular groove in the piston and one Connect the cavity in the piston to the environment to equalize the pressure. Such Device to avoid back expansion has the disadvantage that at one existing compressor significant structural changes can be made have to. (DE 39 02 658 A1)

Der Erfindung liegt die Aufgabe zugrunde eine Vorrichtung zur Vermeidung von Rückexpansion so zu gestalten, daß man mit möglichst geringem baulichen Aufwand auskommt.The invention has for its object a device for avoiding To design back expansion so that one with the least possible construction effort gets along.

Gelöst wird diese Aufgabe durch die kennzeichnenden Merkmale des Patentanspruches 1.This object is achieved by the characterizing features of the claim 1.

Durch das im Kolbenboden eingebaute Ventil und dessen Betätigung durch einen mit dem Pleuelauge verbundenen Nocken läßt sich eine Rückexpansion an bestehenden Verdichtern mit geringem baulichen Aufwand verwirklichen.Through the valve built into the piston crown and its actuation by a the cam connected to the connecting rod eye can be re-expanded to existing ones Realize compressors with little construction effort.

Vorteilhafte Weiterbildungen sind den Unteransprüchen 2 bis 5 zu entnehmen. Advantageous further developments can be found in subclaims 2 to 5.

Ein Ausführungsbeispiel der Erfindung ist an Hand von Zeichnungen dargestellt. Es zeigt:

Fig. 1
einen Längsschnitt durch einen Kolbenverdichter
Fig. 2
ein Detail eines Ventils mit Ventilteller
Fig. 3
ein Detail eines Ventils mit einer Membran
An embodiment of the invention is illustrated with reference to drawings. It shows:
Fig. 1
a longitudinal section through a piston compressor
Fig. 2
a detail of a valve with valve disk
Fig. 3
a detail of a valve with a membrane

Ein Kolbenverdichter besteht nach Fig. 1 im wesentlichen aus einem Zylinder 1, einem Kurbelgehäuse 2, einem Kolben 3, sowie einer Kurbelwelle 4 mit Pleuel 5. Eine unangenehme Eigenschaft des Kolbenverdichters ist darin zu sehen, daß er negative Drehmomente aufweist, die daher rühren, daß nach Überschreiten des Kolbens im OT eine Rückexpansion auftritt. Diese verursacht bei Antrieb des Verdichters mittels Zahnrädern durch das Flankenschlagen sehr unangenehme Getriebegeräusche. Um dies zu vermeiden ist es erforderlich, den Kompressionsraum zwischen Kolben 3 und einem Zylinderkopfboden 6 über das Kurbelgehäuse 2 mit der Atmosphäre zu verbinden.According to FIG. 1, a piston compressor essentially consists of a cylinder 1, a Crankcase 2, a piston 3, and a crankshaft 4 with a connecting rod 5. An uncomfortable The characteristic of the piston compressor is that it has negative torques has, which therefore stir that after exceeding the piston in the OT a Back expansion occurs. This causes gears when the compressor is driven very unpleasant gear noise due to flanking. To do this It is necessary to avoid the compression space between piston 3 and one To connect the cylinder head base 6 to the atmosphere via the crankcase 2.

Erfindungsgemäß wird dies mit einem Ventil 7 bewerkstelligt, welches in einem Kolbenboden 8 angeordnet ist. Betätigt wird dieses Ventil 7 durch einen Nocken 9, welcher sich auf einer Nockenscheibe 10, oder auch direkt auf einem Pleuelauge 11 des Pleuels 5 befindet. Die Nockenscheibe 10 ist drehfest mit dem Pleuelauge 11 verbunden.According to the invention, this is accomplished with a valve 7, which is in a piston crown 8 is arranged. This valve 7 is actuated by a cam 9, which itself on a cam disk 10, or also directly on a connecting rod eye 11 of the Connecting rod 5 is located. The cam disk 10 is connected in a rotationally fixed manner to the connecting rod eye 11.

Zur Funktion ist zu sagen, daß die Bewegung des Ventils 7 von der Schwenkbewegung des Pleuel 5 abgeleitet wird. Durch die Schwenkbewegung des Pleuels 5 führt das Pleuelauge 11 eine Drehbewegung aus, die über die Drehung der Nockenscheibe 10 und des darauf befindlichen Nockens 9 zu einer Anhebung des Ventils 7 im Bereich der OT-Stellung des Kolbens 3 führt. Durch diese Öffnung des Ventils 7 wird die im Kompressionsraum verdichtete Luft entspannt, so daß eine Rückexpansion mit den damit verbundenen negativen Folgen vermieden wird. The function is to be said that the movement of the valve 7 from the pivoting movement of the connecting rod 5 is derived. This leads to the pivoting movement of the connecting rod 5 Connecting rod eye 11 makes a rotary movement which is based on the rotation of the cam disk 10 and the cam 9 located thereon to raise the valve 7 in the area the TDC position of the piston 3 leads. Through this opening of the valve 7 in Compression room relaxes compressed air, so that a back expansion with the associated negative consequences are avoided.

Fig. 2 zeigt im Detail eine Ausführung des Ventils 7. Das Ventil 7 besteht aus einem Ventilteller 12 und dem damit verbundenen Ventilschaft 13. Der Ventilteller 12 wird durch eine Druckfeder 14 gegen einen in den Kolbenboden eingearbeiteten Ventilsitz 15 mit Bohrungen 16 gepreßt. Die Druckfeder 14 stützt sich gegen Kolbenboden 8 und einen Federteller 17 ab, welcher mit dem Ventilschaft 13 verbunden ist. Im Bereich der OT-Stellung des Kolbens 3 ( Fig. 1 ) wird das Ventil 7 über die mit dem Pleuelauge 11 drehfest verbundene Nockenscheibe 10 mit Nocken 9 angehoben. Die im Kompressionsraum befindliche Luft wird über die Bohrungen 16 abgeblasen, und damit eine Rückexpansion vermieden.Fig. 2 shows in detail an embodiment of the valve 7. The valve 7 consists of a Valve plate 12 and the associated valve stem 13. The valve plate 12 is by a compression spring 14 against a valve seat incorporated in the piston crown 15 pressed with holes 16. The compression spring 14 is supported against the piston crown 8 and a spring plate 17, which is connected to the valve stem 13. In the area the TDC position of the piston 3 (Fig. 1), the valve 7 via the connecting rod eye 11 rotatably connected cam 10 with cam 9 raised. The in Compression room air is blown off through the holes 16, and thus avoiding re-expansion.

Eine weitere Ausführungsform des Ventils 7 ist in Fig. 3 dargestellt. In einer Ausnehmung 18 im Kolbenboden 8 ist eine Membran 19 vorgesehen, welche mittels Niete 20 mit dem Kolbenboden 8 verankert ist. Die Membran 19 verschließt die Bohrung 16. Soll nun in OT-Stellung des Kolbens 3 ( Fig. 1 ) Luft abgeblasen werden, so wird die Membran 19 durch den Ventilschaft 13 mittels des Nockens 9 gegen die Rückstellkraft der Druckfeder 14 angehoben und Luft entweicht über die Bohrung 16 im Kolbenboden 8, so daß wiederum Rückexpansion vermieden wird.Another embodiment of the valve 7 is shown in FIG. 3. In a recess 18 in the piston crown 8, a membrane 19 is provided, which by means of rivets 20 is anchored to the piston crown 8. The membrane 19 closes the bore 16. If air is now to be blown off in the TDC position of the piston 3 (FIG. 1), then the Diaphragm 19 through the valve stem 13 by means of the cam 9 against the restoring force the compression spring 14 is raised and air escapes through the bore 16 in the piston crown 8, so that back expansion is avoided.

Durch die erfindungsgemäße Vorrichtung können in Serienherstellung befindliche Kolbenverdichter nur durch den Einbau des Ventils 7 und die Anbringung einer Nockenscheibe 10 am Pleuelkopf 11 auf einen geräuscharmen Betrieb umgerüstet werden.The device according to the invention can be used in series production Piston compressor only by installing valve 7 and attaching one Cam 10 on the connecting rod head 11 converted to a low-noise operation become.

Claims (5)

Vorrichtung zur Vermeidung von Rückexpansion bei Kolbenverdichtern, bei der der Kompressionsraum im Bereich einer OT-Stellung des Kolbens mit der Atmosphäre verbunden wird, dadurch gekennzeichnet, daß diese Verbindung durch ein im Kolbenboden (8) eingebautes Ventil (7) erfolgt, und daß dieses Ventil (7) durch einen Nocken (9) angehoben wird, welcher drehfest mit einem Pleuelauge (11) einer Pleuelstange (5) verbunden ist.Device for avoiding back expansion in piston compressors, in which the compression space in the area of an TDC position of the piston is connected to the atmosphere, characterized in that this connection through a valve (7) installed in the piston crown (8), and that this valve (7) is raised by a cam (9) which is non-rotatable is connected to a connecting rod eye (11) of a connecting rod (5). Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß der Nocken (9) auf dem Pleuelauge (11) selbst angeordnet ist.Device according to claim 1, characterized in that the cam (9) is arranged on the connecting rod eye (11) itself. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß der Nocken (9) auf einer Nockenscheibe (10) angeordnet ist, und daß diese Nockenscheibe (10) drehfest mit dem Pleuelauge (11) verbunden ist.Device according to claim 1, characterized in that the cam (9) a cam disc (10) is arranged, and that this cam disc (10) is rotatably connected to the connecting rod eye (11). Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß das Ventil (7) aus Ventilschaft (13) mit Ventilteller (12) gebildet wird und der Ventilteller (12) mittels einer Druckfeder (14) gegen einen in den Kolbenboden (8) eingearbeiteten Ventilsitz (15) mit Bohrungen (16) gepreßt wird, wobei sich die Druckfeder (14) einerseits gegen den Kolbenboden (8) und andererseits gegen einen mit dem Ventilschaft (13) verbundenen Federteller (17) abstützt.Device according to claim 1, characterized in that the valve (7) is off Valve stem (13) is formed with valve plate (12) and the valve plate (12) by means of a compression spring (14) against one worked into the piston crown (8) Valve seat (15) with holes (16) is pressed, the Compression spring (14) on the one hand against the piston crown (8) and on the other hand against supports a spring plate (17) connected to the valve stem (13). Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß das Ventil (7) als eine Membran (19) ausgebildet ist, welche in einer Ausnehmung (18) des Kolbenbodens (8) angeordnet ist, daß die Membran (19) an einem Ende fest im Kolbenboden (8) verankert ist und am anderen Ende durch einen Ventilschaft (13) anhebbar ist und daß der Ventilschaft (13) mit einer Druckfeder (14) korrespondiert, welche den Ventilschaft (13) in einer Stellung halt, in welcher die Membran (19) eine Bohrung (16) im Kolbenboden (8) verschließt.Apparatus according to claim 1, characterized in that the valve (7) as a membrane (19) is formed which in a recess (18) of the Piston bottom (8) is arranged so that the membrane (19) fixed at one end is anchored in the piston crown (8) and at the other end by a valve stem (13) can be raised and that the valve stem (13) with a compression spring (14) corresponds which holds the valve stem (13) in a position in which the membrane (19) closes a bore (16) in the piston crown (8).
EP98117617A 1997-10-01 1998-09-17 Device for avoiding disturbing back expansion in a piston compressor Withdrawn EP0907022A3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19743444 1997-10-01
DE1997143444 DE19743444C2 (en) 1997-10-01 1997-10-01 Device for avoiding back expansion in piston compressors

Publications (2)

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EP0907022A2 true EP0907022A2 (en) 1999-04-07
EP0907022A3 EP0907022A3 (en) 2001-06-20

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EP98117617A Withdrawn EP0907022A3 (en) 1997-10-01 1998-09-17 Device for avoiding disturbing back expansion in a piston compressor

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DE (1) DE19743444C2 (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102016114511A1 (en) 2015-08-31 2017-03-02 Martin Maeser Reciprocating engine with inlet valve in the piston head

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3902658A1 (en) 1989-01-30 1990-08-02 Knorr Bremse Ag Piston compressor

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE229229C (en) *
GB248595A (en) * 1925-05-13 1926-03-11 Leon De Vooght Improved air compressor
US1607478A (en) * 1925-06-18 1926-11-16 Prestage Edwin Suction valve of air and gas compressors
DE3112386A1 (en) * 1981-03-28 1982-12-02 Fichtel & Sachs Ag, 8720 Schweinfurt Compressor
DE3514119A1 (en) * 1985-04-19 1986-10-23 Klöckner-Humboldt-Deutz AG, 5000 Köln Method for operating a compressor having at least two cylinders, and device for implementing the method
DE4018055A1 (en) * 1990-06-06 1991-12-12 Man Nutzfahrzeuge Ag METHOD FOR REDUCING GEARBOX NOISE IN PISTON COMPRESSORS, AND DEVICE FOR CARRYING OUT THIS METHOD

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3902658A1 (en) 1989-01-30 1990-08-02 Knorr Bremse Ag Piston compressor

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Publication number Publication date
DE19743444C2 (en) 1999-12-16
DE19743444A1 (en) 1999-04-08
EP0907022A3 (en) 2001-06-20

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