EP3516231B1 - Screw compressor for a utility vehicle - Google Patents

Screw compressor for a utility vehicle Download PDF

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Publication number
EP3516231B1
EP3516231B1 EP17769063.3A EP17769063A EP3516231B1 EP 3516231 B1 EP3516231 B1 EP 3516231B1 EP 17769063 A EP17769063 A EP 17769063A EP 3516231 B1 EP3516231 B1 EP 3516231B1
Authority
EP
European Patent Office
Prior art keywords
screw compressor
oil
air
housing
relief valve
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.)
Active
Application number
EP17769063.3A
Other languages
German (de)
French (fr)
Other versions
EP3516231A1 (en
Inventor
Gilles Hebrard
Jean-Baptiste Marescot
Jörg MELLAR
Thomas Weinhold
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.)
Knorr Bremse Systeme fuer Nutzfahrzeuge GmbH
Original Assignee
Knorr Bremse Systeme fuer Nutzfahrzeuge GmbH
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Publication of EP3516231A1 publication Critical patent/EP3516231A1/en
Application granted granted Critical
Publication of EP3516231B1 publication Critical patent/EP3516231B1/en
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C18/00—Rotary-piston pumps specially adapted for elastic fluids
    • F04C18/08—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
    • F04C18/12—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type
    • F04C18/14—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons
    • F04C18/16—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons with helical teeth, e.g. chevron-shaped, screw type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C28/00—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids
    • F04C28/28—Safety arrangements; Monitoring
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
    • F04C29/02—Lubrication; Lubricant separation
    • F04C29/026—Lubricant separation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2210/00—Fluid
    • F04C2210/10—Fluid working
    • F04C2210/1005—Air
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2210/00—Fluid
    • F04C2210/22—Fluid gaseous, i.e. compressible
    • F04C2210/221—Air
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2240/00—Components
    • F04C2240/30—Casings or housings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2280/00—Arrangements for preventing or removing deposits or corrosion
    • F04C2280/04—Preventing corrosion
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
    • F05B2210/00—Working fluid
    • F05B2210/10—Kind or type
    • F05B2210/12—Kind or type gaseous, i.e. compressible
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
    • F05B2210/00—Working fluid
    • F05B2210/16—Air or water being indistinctly used as working fluid, i.e. the machine can work equally with air or water without any modification
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
    • F05B2260/00—Function
    • F05B2260/98—Lubrication
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05C—INDEXING SCHEME RELATING TO MATERIALS, MATERIAL PROPERTIES OR MATERIAL CHARACTERISTICS FOR MACHINES, ENGINES OR PUMPS OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES
    • F05C2201/00—Metals
    • F05C2201/02—Light metals
    • F05C2201/021—Aluminium
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05C—INDEXING SCHEME RELATING TO MATERIALS, MATERIAL PROPERTIES OR MATERIAL CHARACTERISTICS FOR MACHINES, ENGINES OR PUMPS OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES
    • F05C2201/00—Metals
    • F05C2201/04—Heavy metals
    • F05C2201/0433—Iron group; Ferrous alloys, e.g. steel
    • F05C2201/0436—Iron
    • F05C2201/0439—Cast iron
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05C—INDEXING SCHEME RELATING TO MATERIALS, MATERIAL PROPERTIES OR MATERIAL CHARACTERISTICS FOR MACHINES, ENGINES OR PUMPS OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES
    • F05C2225/00—Synthetic polymers, e.g. plastics; Rubber

Definitions

  • the present invention relates to a screw compressor for a commercial vehicle with at least one housing and with at least one air oil separator holder arranged on the housing.
  • Screw compressors for commercial vehicles are already known from the prior art. Such screw compressors are used to provide the necessary compressed air for example for the braking system of the commercial vehicle.
  • oil-filled compressors in particular also screw compressors, are known in which the task is to regulate the oil temperature.
  • This is usually achieved by having an external oil cooler that is connected to the oil-filled compressor and the oil circuit via a thermostatic valve.
  • the oil cooler is a heat exchanger which has two separate circuits, the first circuit being provided for the hot liquid, that is to say the compressor oil, and the second being provided for the cooling liquid.
  • air, water mixtures with an antifreeze agent or another oil can be used as the coolant.
  • This oil cooler must then be connected to the compressor oil circuit via pipes or hoses and the oil circuit must be secured against leaks.
  • This external volume must also be filled with oil, so that the total amount of oil is also increased. This increases the system inertia.
  • the oil cooler must be housed and fastened mechanically, either by means of brackets located around it or by a separate bracket, which requires additional fastening means, but also installation space.
  • a compressor device for generating compressed air in a rail vehicle comprising a housing with a screw compressor arranged therein with an air inlet for sucking in ambient air and an outlet orifice for ejecting compressed air, an underside of the housing in relation to the gravitational direction with an oil sump arranged therein for collection and return from the screw compressor lubricating oil and at least two oil separation devices arranged on the output side of the screw compressor.
  • an oil separator silencer for a compressor is also disclosed, more precisely an oil separator silencer which separates oil from the gaseous medium by means of an impact principle.
  • the object of the present invention is to advantageously develop a screw compressor for a utility vehicle of the type mentioned at the outset, in particular to the effect that corrosion of components of the screw compressor can be prevented or does not even occur.
  • a screw compressor for a commercial vehicle is provided with at least one housing and with at least one air oil separator holder arranged on the housing, a relief valve being provided in the Air oil separator holder is arranged, by means of which the interior of the screw compressor can be relieved of pressure, thereby characterized in that the air oil separator holder is made of non-corrosive material, wherein the relief valve is connected to the air inlet of the screw compressor and wherein the relief valve can be connected to the atmosphere via the air inlet, wherein the housing is made of a different material than the air oil separator holder consists.
  • the invention is based on the basic idea that the relief valve, its connections and its surroundings, experience has shown that moisture precipitation attracts, are arranged at a point in the screw compressor at which corrosion cannot take place.
  • the air oil separator holder is made of non-corrosive material and that the relief valve, by means of which the interior of the screw compressor can be depressurized, is to be arranged there. This prevents corrosion from occurring in the housing of the screw compressor.
  • the areas in which, according to experience, corrosion occurs in a screw compressor are thus relocated to areas of the screw compressor in which corrosion cannot occur because only non-corrosive material is present there.
  • the non-corrosive material consists at least partially of aluminum or at least partially consists of an aluminum alloy. This enables simple production, for example by casting or machining processes. In addition, sufficient stability can be achieved. Aluminum or aluminum alloys can also be used as suitable non-corrosive materials.
  • the relief valve is connected to the air inlet of the screw compressor. This provides a simple construction for pressure relief of the screw compressor.
  • the cross-sections of the air inlet are also well suited to relieve pressure.
  • connection of the relief valve with the air inlet of the screw compressor is at least partially guided outside the housing of the screw compressor. This avoids complex guides and compressed air connections between the relief valve and the air inlet inside the housing of the screw compressor. A simple and reliable connection which, if necessary, can also be appropriately serviced or provided with replacement parts, is possible.
  • connection between the relief valve and the air inlet of the screw compressor is at least partially formed by a plastic hose.
  • the plastic hose can in particular also be guided outside the housing of the screw compressor.
  • the relief valve can be connected to the atmosphere via the air inlet.
  • the housing is made of a different material than the air-oil separator holder. This enables a more cost-effective and simpler production, since it is not absolutely necessary to have to manufacture all components of the screw compressor and also not all housing components of the screw compressor from non-corrosive material. In each case suitable materials, which also meet the cost requirements, can thus be selected. This can have a favorable effect on the costs of the screw compressor.
  • the housing can consist of a cast material, in particular cast iron. This enables simple and inexpensive manufacture.
  • Fig. 1 shows a schematic sectional view of a screw compressor 10 in the sense of an exemplary embodiment of the present invention.
  • the screw compressor 10 has a fastening flange 12 for the mechanical fastening of the screw compressor 10 to an electric motor not shown in detail here.
  • the screw 18 meshes with the screw 16 and is driven by this.
  • the screw compressor 10 has a housing 20 in which the essential components of the screw compressor 10 are accommodated.
  • the housing 20 is filled with oil 22.
  • an inlet connector 24 is provided on the housing 20 of the screw compressor 10.
  • the inlet connector 24 is designed such that an air filter 26 is arranged on it.
  • an air inlet 28 is provided radially on the air inlet connector 24.
  • a spring-loaded valve insert 30 is provided, designed here as an axial seal.
  • This valve insert 30 serves as a check valve.
  • An air supply channel 32 is provided downstream of the valve insert 30 and supplies the air to the two screws 16, 18.
  • an air outlet pipe 34 with a riser 36 is provided on the output side of the two screws 16, 18.
  • a temperature sensor 38 is provided, by means of which the oil temperature can be monitored.
  • a holder 40 for an air / oil separator 42 is also provided in the air outlet area.
  • the holder 40 for the exhaust filter has in the assembled state in the area facing the floor (as also in FIG Fig. 1 shown) the exhaust filter 42 on.
  • a corresponding filter screen or known filter and oil separation devices 44 which are not specified in detail, are also provided inside the exhaust filter 42.
  • the holder for the exhaust filter 40 has an air outlet opening 46, which lead to a check valve 48 and a minimum pressure valve 50.
  • the check valve 48 and the minimum pressure valve 50 can also be formed in a common, combined valve.
  • the air outlet 51 is provided downstream of the check valve 48.
  • the air outlet 51 is usually connected to correspondingly known compressed air consumers.
  • a riser 52 is provided which has a filter and check valve 54 at the outlet of the holder 40 for the exhaust filter 42 when it passes into the housing 20.
  • a nozzle 56 is provided in a housing bore downstream of the filter and check valve 54.
  • the oil return line 58 leads back approximately to the middle area of the screw 16 or the screw 18 in order to supply oil 22 again.
  • An oil drain plug 59 is provided in the bottom area of the housing 20 in the assembled state. A corresponding oil drain opening through which the oil 22 can be drained can be opened via the oil drain screw 59.
  • the housing 20 In the lower area of the housing 20 there is also the extension 60 to which the oil filter 62 is attached.
  • the oil 22 is first fed to a thermostatic valve 66 via an oil filter inlet channel 64 which is arranged in the housing 20.
  • thermostat valve 66 a control and / or regulating device can be provided, by means of which the oil temperature of the oil 22 located in the housing 20 can be monitored and adjusted to a setpoint value.
  • a nozzle 72 is also provided, which is provided in the housing 20 in connection with the return line 68.
  • the cooler 74 is connected to the extension 60.
  • a safety valve 76 In the upper area of the housing 20 (in relation to the assembled state) there is a safety valve 76, via which an excessively high pressure in the housing 20 can be reduced.
  • a bypass line 78 which leads to a relief valve 80, is located upstream of the minimum pressure valve 50. Air can be fed back into the area of the air inlet 28 via this relief valve 80, which is controlled by means of a connection to the air supply 32.
  • a vent valve (not shown in more detail) and also a nozzle (diameter reduction of the supply line) can be provided in this area.
  • an oil level sensor 82 can be provided approximately at the level of the line 34 in the outer wall of the housing 20.
  • This oil level sensor 82 can be, for example, an optical sensor and can be designed and set up in such a way that the sensor signal can be used to identify whether the oil level is above the oil level sensor 82 during operation or whether the oil level sensor 82 is exposed and the oil level has fallen accordingly as a result.
  • an alarm unit can also be provided that outputs or forwards a corresponding error message or warning message to the user of the system.
  • the function of the in Fig. 1 shown screw compressor 10 is as follows: Air is supplied via the air inlet 28 and reaches the screws 16, 18 via the check valve 30, where the air is compressed. The compressed air-oil mixture, which rises with a factor of between 5 and 16-fold compression after the screws 16 and 18 through the outlet line 34 via the riser pipe 36, is blown directly onto the temperature sensor 38.
  • the air which still partially carries oil particles, is then guided via the holder 40 into the exhaust filter 42 and, if the corresponding minimum pressure is reached, reaches the air outlet line 51.
  • the oil 22 located in the housing 20 is kept at operating temperature via the oil filter 62 and possibly via the heat exchanger 74.
  • the heat exchanger 74 is not used and is also not switched on.
  • the corresponding connection takes place via the thermostatic valve 68.
  • oil is fed to the screw 18 or the screw 16, but also to the bearing 72, via the line 68.
  • the screw 16 or the screw 18 is supplied with oil 22 via the return line 52, 58; here the oil 22 is purified in the exhaust filter 42.
  • the screws 16 and 18 of the screw compressor 10 are driven by the electric motor, not shown in detail, which transmits its torque via the shaft 14 to the screw 16, which in turn meshes with the shaft 18.
  • the relief valve 80 ensures that in the area of the supply line 32, the high pressure that prevails in the operating state, for example on the outlet side of the screws 16, 18, cannot be locked in, but that especially when the compressor starts up in the area of the supply line 32 there is a low inlet pressure, in particular atmospheric pressure. Otherwise, when the compressor starts up, a very high pressure would initially arise on the output side of the screws 16 and 18, which would overload the drive motor.
  • Fig. 2 shows a schematic sectional illustration in perspective of a section through the screw compressor 10.
  • the air oil separator holder 40 is made here of aluminum and is fastened to the outside of the housing 20 of the screw compressor 10.
  • the air oil separator 42 or the air / oil separator 42 is mounted on the air oil separator holder 40.
  • the relief valve 80 is arranged in the air oil separator holder 40.
  • the outlet of the relief valve 80 is connected to the air inlet 28 of the screw compressor 10 via a plastic hose 100 running outside the housing 20, whereby the outlet of the relief valve 80 can be connected to the atmosphere.
  • the relief valve 80 By arranging the relief valve 80 in the air oil separator holder 40, which is made of aluminum, it is achieved that moisture deposits that occur there cannot lead to corrosion, since the air oil separator holder 40 is made of non-corrosive material.
  • a connecting line with a small cross section is known to be susceptible to moisture precipitation and thus to corrosion.
  • connection is established by means of a plastic hose 100 prevents corrosion.
  • connection becomes blocked, it can simply be exchanged, since it runs outside the housing 20.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Applications Or Details Of Rotary Compressors (AREA)
  • Compressor (AREA)

Description

Die vorliegende Erfindung betrifft einen Schraubenkompressor für ein Nutzfahrzeug mit wenigstens einem Gehäuse und mit wenigstens einem am Gehäuse angeordneten Luftölabscheider-Halter.The present invention relates to a screw compressor for a commercial vehicle with at least one housing and with at least one air oil separator holder arranged on the housing.

Aus dem Stand der Technik sind bereits Schraubenkompressoren für Nutzfahrzeuge bekannt. Derartige Schraubenkompressoren werden verwendet, um die notwendige Druckluft für beispielsweise das Bremssystem des Nutzfahrzeugs bereitzustellen.Screw compressors for commercial vehicles are already known from the prior art. Such screw compressors are used to provide the necessary compressed air for example for the braking system of the commercial vehicle.

In diesem Zusammenhang sind insbesondere Öl befüllte Kompressoren, insbesondere auch Schraubenkompressoren bekannt, bei denen sich als Aufgabe stellt, die Öltemperatur zu regulieren. Dies wird in der Regel dadurch bewerkstelligt, dass ein externer Ölkühler vorhanden ist, der mit dem Öl befüllten Kompressor und dem Ölkreislauf über ein Thermostatventil verbunden ist. Der Ölkühler ist dabei ein Wärmetauscher, der zwei voneinander getrennte Kreisläufe aufweist, wobei der erste Kreislauf für die heiße Flüssigkeit, also das Kompressoröl, vorgesehen ist und der zweite für die Kühlflüssigkeit. Als Kühlflüssigkeit können beispielsweise Luft, Wassergemische mit einem Frostschutzmittel oder einem anderen Öl verwendet werden.In this context, oil-filled compressors, in particular also screw compressors, are known in which the task is to regulate the oil temperature. This is usually achieved by having an external oil cooler that is connected to the oil-filled compressor and the oil circuit via a thermostatic valve. The oil cooler is a heat exchanger which has two separate circuits, the first circuit being provided for the hot liquid, that is to say the compressor oil, and the second being provided for the cooling liquid. For example, air, water mixtures with an antifreeze agent or another oil can be used as the coolant.

Dieser Ölkühler muss sodann mit dem Kompressorölkreislauf über Rohre oder Schläuche verbunden werden und der Ölkreislauf muss gegen Leckagen gesichert werden.This oil cooler must then be connected to the compressor oil circuit via pipes or hoses and the oil circuit must be secured against leaks.

Dieses externe Volumen muss des Weiteren mit Öl befüllt werden, so dass auch die Gesamtmenge an Öl vergrößert wird. Dadurch wird die Systemträgheit vergrößert. Darüber hinaus muss der Ölkühler mechanisch untergebracht und befestigt werden, entweder durch umliegend befindliche Halterungen oder durch eine gesonderte Halterung, was zusätzliche Bestigungsmittel, aber auch Bauraum benötigt.This external volume must also be filled with oil, so that the total amount of oil is also increased. This increases the system inertia. In addition, the oil cooler must be housed and fastened mechanically, either by means of brackets located around it or by a separate bracket, which requires additional fastening means, but also installation space.

Aus der DE 41 31 857 C2 ist beispielsweise ein Schraubenkompressor bekannt, der einen gehäuseseitigen Ölabscheider aufweist.From the DE 41 31 857 C2 For example, a screw compressor is known which has an oil separator on the housing side.

Aus der DE 44 15 875 A1 ist bereits ein Schraubenverdichter bekannt, der ein Aluminiumgehäuse aufweist.From the DE 44 15 875 A1 a screw compressor is already known which has an aluminum housing.

Aus der DE 10 2014 118 266 B3 ist ferner eine Kompressorvorrichtung zur Drucklufterzeugung bei einem Schienenfahrzeug offenbart, umfassend ein Gehäuse mit darin angeordnetem Schraubenkompressor mit einem Lufteinlass zum Ansaugen von Umgebungsluft sowie einer Ausgangsmündung zum Ausstoß von Druckluft, einer auf die Gravitationsrichtung bezogenen Unterseite des Gehäuses mit darin angeordnetem Ölsumpf zum Auffangen und zum Rückführen von den Schraubenkompressor schmierendem Schmieröl sowie mindestens zwei ausgangsseitig des Schraubenkompressors angeordneten Ölabscheidevorrichtungen.From the DE 10 2014 118 266 B3 Furthermore, a compressor device for generating compressed air in a rail vehicle is disclosed, comprising a housing with a screw compressor arranged therein with an air inlet for sucking in ambient air and an outlet orifice for ejecting compressed air, an underside of the housing in relation to the gravitational direction with an oil sump arranged therein for collection and return from the screw compressor lubricating oil and at least two oil separation devices arranged on the output side of the screw compressor.

Aus der US 2006/260340 A1 ist weiter ein Ölabscheider-Schalldämpfer für einen Kompressor offenbart, genauer gesagt, ein Ölabscheider-Schalldämpfer, der Öl durch ein Prallprinzip vom gasförmigen Medium trennt.From the US 2006/260340 A1 an oil separator silencer for a compressor is also disclosed, more precisely an oil separator silencer which separates oil from the gaseous medium by means of an impact principle.

Es ist die Aufgabe der vorliegenden Erfindung, einen Schraubenkompressor für ein Nutzfahrzeug der eingangs genannten Art in vorteilhafter Weise weiterzubilden, insbesondere dahingehend, dass die Korrosion von Komponenten des Schraubenkompressors verhindert werden kann bzw. gar nicht erst auftritt.The object of the present invention is to advantageously develop a screw compressor for a utility vehicle of the type mentioned at the outset, in particular to the effect that corrosion of components of the screw compressor can be prevented or does not even occur.

Diese Aufgabe wird erfindungsgemäß gelöst durch einen Schraubenkompressor mit den Merkmalen des Anspruchs 1. Danach ist vorgesehen, dass ein Schraubenkompressor für ein Nutzfahrzeug mit wenigstens einem Gehäuse und mit wenigstens einem am Gehäuse angeordneten Luftölabscheider-Halter versehen ist, wobei ein Entlastungsventil vorgesehen ist, das im Luftölabscheider-Halter angeordnet ist, mittels dessen das Innere des Schraubenkompressors druckentlastbar ist, dadurch gekennzeichnet, dass der Luftölabscheider-Halter aus nicht-korrosivem Material gefertigt ist, wobei das Entlastungsventil mit dem Lufteinlass des Schraubenkompressors verbunden ist und wobei das Entlastungsventil über den Lufteinlass mit der Atmosphäre verbindbar ist, wobei das Gehäuse aus einem anderen Material als der Luftölabscheider-Halter besteht.This object is achieved according to the invention by a screw compressor with the features of claim 1. According to this, it is provided that a screw compressor for a commercial vehicle is provided with at least one housing and with at least one air oil separator holder arranged on the housing, a relief valve being provided in the Air oil separator holder is arranged, by means of which the interior of the screw compressor can be relieved of pressure, thereby characterized in that the air oil separator holder is made of non-corrosive material, wherein the relief valve is connected to the air inlet of the screw compressor and wherein the relief valve can be connected to the atmosphere via the air inlet, wherein the housing is made of a different material than the air oil separator holder consists.

Die Erfindung basiert auf dem Grundgedanken, dass das Entlastungsventil, dessen Anschlüsse und dessen Umgebung erfahrungsgemäß Feuchtigkeitsniederschlag anziehen, an einer Stelle im Schraubenkompressor angeordnet werden, an der keine Korrosion stattfinden kann. In diesem Zusammenhang wird vorgesehen, den Luftölabscheider-Halter aus nicht-korrosivem Material zu fertigen und dort das Entlastungsventil, mittels dessen das Innere des Schraubenkompressors druckentlastet werden kann, anzuordnen. Hierdurch wird vermieden, dass es im Gehäuse des Schraubenkompressors zu Korrosionen kommt. Die Bereiche, in denen erfahrungsgemäß bei einem Schraubenkompressor Korrosion auftritt, werden somit in Bereiche des Schraubenkompressors verlegt, in denen es zu keiner Korrosion kommen kann, weil dort lediglich nicht-korrosives Material vorhanden ist.The invention is based on the basic idea that the relief valve, its connections and its surroundings, experience has shown that moisture precipitation attracts, are arranged at a point in the screw compressor at which corrosion cannot take place. In this context, it is provided that the air oil separator holder is made of non-corrosive material and that the relief valve, by means of which the interior of the screw compressor can be depressurized, is to be arranged there. This prevents corrosion from occurring in the housing of the screw compressor. The areas in which, according to experience, corrosion occurs in a screw compressor are thus relocated to areas of the screw compressor in which corrosion cannot occur because only non-corrosive material is present there.

Es kann vorgesehen sein, dass das nicht-korrosive Material zumindest teilweise aus Aluminium besteht oder zumindest teilweise aus einer Aluminiumlegierung besteht. Hierdurch wird eine einfache Fertigung beispielsweise durch Guss- oder Spanverfahren ermöglicht. Außerdem ist ausreichende Stabilität erreichbar. Aluminium oder Aluminiumlegierungen sind darüber hinaus als geeignete nicht-korrosive Materialien gut verwendbar.It can be provided that the non-corrosive material consists at least partially of aluminum or at least partially consists of an aluminum alloy. This enables simple production, for example by casting or machining processes. In addition, sufficient stability can be achieved. Aluminum or aluminum alloys can also be used as suitable non-corrosive materials.

Das Entlastungsventil ist mit dem Lufteinlass des Schraubenkompressors verbunden. Hierüber wird eine einfache Konstruktion zur Druckentlastung des Schraubenkompressors bereitgestellt. Die Querschnitte des Lufteinlasses sind darüber hinaus gut geeignet, um eine Druckentlastung herbeizuführen.The relief valve is connected to the air inlet of the screw compressor. This provides a simple construction for pressure relief of the screw compressor. The cross-sections of the air inlet are also well suited to relieve pressure.

Darüber hinaus kann vorgesehen sein, dass die Verbindung von Entlastungsventil mit dem Lufteinlass des Schraubenkompressors zumindest teilweise außerhalb des Gehäuses des Schraubenkompressors geführt ist. Hierdurch werden aufwendige Führungen und Druckluftverbindungen zwischen dem Entlastungsventil und dem Lufteinlass im Inneren des Gehäuses des Schraubenkompressors vermieden. Eine einfache und zuverlässige Verbindung, die gegebenfalls auch entsprechend gewartet oder mit Ersatzteilen versehen werden kann, ist dadurch möglich.In addition, it can be provided that the connection of the relief valve with the air inlet of the screw compressor is at least partially guided outside the housing of the screw compressor. This avoids complex guides and compressed air connections between the relief valve and the air inlet inside the housing of the screw compressor. A simple and reliable connection which, if necessary, can also be appropriately serviced or provided with replacement parts, is possible.

Des Weiteren kann vorgesehen sein, dass die Verbindung von Entlastungsventil mit dem Lufteinlass des Schraubenkompressors zumindest teilweise durch einen Kunststoffschlauch ausgebildet ist. Hierüber wird eine einfache und zuverlässige nicht-korrosive Verbindung zwischen dem Entlastungsventil und dem Lufteinlass ausgebildet. Der Kunststoffschlauch kann insbesondere auch außerhalb des Gehäuses des Schraubenkompressors geführt sein.Furthermore, it can be provided that the connection between the relief valve and the air inlet of the screw compressor is at least partially formed by a plastic hose. This creates a simple and reliable non-corrosive connection between the relief valve and the air inlet. The plastic hose can in particular also be guided outside the housing of the screw compressor.

Das Entlastungsventil ist über den Lufteinlass mit der Atmosphäre verbindbar.The relief valve can be connected to the atmosphere via the air inlet.

Hierüber wird ein einfacher und zuverlässiger Druckabbau über den Lufteinlass vom Entlastungsventil her ermöglicht.This enables a simple and reliable pressure reduction via the air inlet from the relief valve.

Außerdem ist vorgesehen, dass das Gehäuse aus einem anderen Material als der Luftölabscheider-Halter besteht. Dies ermöglicht eine kostengünstigere und einfachere Herstellung, da es nicht zwingend erforderlich ist, sämtliche Bestandteile des Schraubenkompressors und auch nicht sämtliche Gehäusebestandteile des Schraubenkompressors aus nicht-korrosivem Material fertigen zu müssen. Jeweils geeignete Materialien, die auch entsprechend den Kostenanforderungen genügen, können somit gewählt werden. Die Kosten des Schraubenkompressors können hierdurch günstig beeinflusst werden.It is also provided that the housing is made of a different material than the air-oil separator holder. This enables a more cost-effective and simpler production, since it is not absolutely necessary to have to manufacture all components of the screw compressor and also not all housing components of the screw compressor from non-corrosive material. In each case suitable materials, which also meet the cost requirements, can thus be selected. This can have a favorable effect on the costs of the screw compressor.

Das Gehäuse kann aus einem Gussmaterial bestehen, insbesondere aus Gusseisen. Hierdurch wird eine einfache und kostengünstige Herstellung ermöglicht.The housing can consist of a cast material, in particular cast iron. This enables simple and inexpensive manufacture.

Weitere Einzelheiten und Vorteile der Erfindung sollen nun anhand eines in den Zeichnungen dargestellten Ausführungsbeispiels näher erläutert werden.Further details and advantages of the invention will now be explained in more detail using an exemplary embodiment shown in the drawings.

Es zeigen:

Fig. 1
eine schematische Schnittzeichnung durch einen erfindungsgemäßen Schraubenkompressor; und
Fig. 2
eine perspektivische Schnittansicht auf den Schraubenkompressor mit Detaildarstellung des Luftölscheider-Halters des Schraubenkompressors.
Show it:
Fig. 1
a schematic sectional drawing through a screw compressor according to the invention; and
Fig. 2
a perspective sectional view of the screw compressor with a detailed representation of the air oil separator holder of the screw compressor.

Fig. 1 zeigt in einer schematischen Schnittdarstellung einen Schraubenkompressor 10 im Sinne eines Ausführungsbeispiels für die vorliegende Erfindung. Fig. 1 shows a schematic sectional view of a screw compressor 10 in the sense of an exemplary embodiment of the present invention.

Der Schraubenkompressor 10 weist einen Befestigungsflansch 12 zur mechanischen Befestigung des Schraubenkompressors 10 an einem hier nicht näher gezeigten Elektromotor auf.The screw compressor 10 has a fastening flange 12 for the mechanical fastening of the screw compressor 10 to an electric motor not shown in detail here.

Gezeigt ist jedoch die Eingangswelle 14, über die das Drehmoment vom Elektromotor auf eine der beiden Schrauben 16 und 18, nämlich die Schraube 16 übertragen wird.What is shown, however, is the input shaft 14, via which the torque from the electric motor is transmitted to one of the two screws 16 and 18, namely the screw 16.

Die Schraube 18 kämmt mit der Schraube 16 und wird über diese angetrieben.The screw 18 meshes with the screw 16 and is driven by this.

Der Schraubenkompressor 10 weist ein Gehäuse 20 auf, in dem die wesentlichen Komponenten des Schraubenkompressors 10 untergebracht sind.The screw compressor 10 has a housing 20 in which the essential components of the screw compressor 10 are accommodated.

Das Gehäuse 20 ist mit Öl 22 befüllt.The housing 20 is filled with oil 22.

Lufteingangsseitig ist am Gehäuse 20 des Schraubenkompressors 10 ein Einlassstutzen 24 vorgesehen. Der Einlassstutzen 24 ist dabei derart ausgebildet, dass an ihm ein Luftfilter 26 angeordnet ist. Außerdem ist radial am Lufteinlassstutzen 24 ein Lufteinlass 28 vorgesehen.On the air inlet side, an inlet connector 24 is provided on the housing 20 of the screw compressor 10. The inlet connector 24 is designed such that an air filter 26 is arranged on it. In addition, an air inlet 28 is provided radially on the air inlet connector 24.

Im Bereich zwischen Einlassstutzen 24 und der Stelle, an dem der Einlassstutzen 24 am Gehäuse 20 ansetzt, ist ein federbelasteter Ventileinsatz 30 vorgesehen, hier als Axialdichtung ausgeführt.In the area between the inlet connector 24 and the point at which the inlet connector 24 attaches to the housing 20, a spring-loaded valve insert 30 is provided, designed here as an axial seal.

Dieser Ventileinsatz 30 dient als Rückschlagventil.This valve insert 30 serves as a check valve.

Stromabwärts des Ventileinsatzes 30 ist ein Luftzuführkanal 32 vorgesehen, der die Luft den beiden Schrauben 16, 18 zuführt.An air supply channel 32 is provided downstream of the valve insert 30 and supplies the air to the two screws 16, 18.

Ausgangsseitig der beiden Schrauben 16, 18 ist ein Luftauslassrohr 34 mit einer Steigleitung 36 vorgesehen.On the output side of the two screws 16, 18, an air outlet pipe 34 with a riser 36 is provided.

Im Bereich des Endes der Steigleitung 36 ist ein Temperaturfühler 38 vorgesehen, mittels dessen die Öltemperatur überwachbar ist.In the area of the end of the riser pipe 36, a temperature sensor 38 is provided, by means of which the oil temperature can be monitored.

Weiter vorgesehen ist im Luftauslassbereich ein Halter 40 für ein Luftentölelement 42.A holder 40 for an air / oil separator 42 is also provided in the air outlet area.

Der Halter 40 für das Luftentölelement weist im montierten Zustand im dem Boden zugewandten Bereich (wie auch in Fig. 1 gezeigt) das Luftentölelement 42 auf.The holder 40 for the exhaust filter has in the assembled state in the area facing the floor (as also in FIG Fig. 1 shown) the exhaust filter 42 on.

Weiter vorgesehen ist im Inneren der Luftentölelement 42 ein entsprechendes Filtersieb bzw. bekannte Filter- und Ölabscheidevorrichtungen 44, die nicht näher im Einzelnen spezifiziert werden.A corresponding filter screen or known filter and oil separation devices 44, which are not specified in detail, are also provided inside the exhaust filter 42.

Im zentralen oberen Bereich, bezogen auf den montierten und betriebsfertigen Zustand (also wie in Fig. 1 gezeigt), weist der Halter für das Luftentölelement 40 eine Luftausgangsöffnung 46 auf, die zu einem Rückschlagventil 48 und einem Mindestdruckventil 50 führen. Das Rückschlagventil 48 und das Mindestdruckventil 50 können auch in einem gemeinsamen, kombinierten Ventil ausgebildet sein.In the central upper area, based on the assembled and ready-to-use condition (i.e. as in Fig. 1 shown), the holder for the exhaust filter 40 has an air outlet opening 46, which lead to a check valve 48 and a minimum pressure valve 50. The check valve 48 and the minimum pressure valve 50 can also be formed in a common, combined valve.

Nachfolgend des Rückschlagventils 48 ist der Luftauslass 51 vorgesehen.The air outlet 51 is provided downstream of the check valve 48.

Der Luftauslass 51 ist mit entsprechend bekannten Druckluftverbrauchern in der Regel verbunden.The air outlet 51 is usually connected to correspondingly known compressed air consumers.

Um das im Luftentölelement 42 befindliche und abgeschiedene Öl 22 wieder in das Gehäuse 20 zurückzuführen, ist eine Steigleitung 52 vorgesehen, die ausgangs des Halters 40 für das Luftentölelement 42 beim Übertritt in das Gehäuse 20 ein Filter- und Rückschlagventil 54 aufweist.In order to return the separated oil 22 in the exhaust filter 42 to the housing 20, a riser 52 is provided which has a filter and check valve 54 at the outlet of the holder 40 for the exhaust filter 42 when it passes into the housing 20.

Stromabwärts des Filter- und Rückschlagventils 54 ist in einer Gehäusebohrung eine Düse 56 vorgesehen. Die Ölrückführleitung 58 führt zurück in etwa den mittleren Bereich der Schraube 16 oder der Schraube 18, um dieser wieder Öl 22 zuzuführen.A nozzle 56 is provided in a housing bore downstream of the filter and check valve 54. The oil return line 58 leads back approximately to the middle area of the screw 16 or the screw 18 in order to supply oil 22 again.

Im im montierten Zustand befindlichen Bodenbereich des Gehäuses 20 ist eine Ölablassschraube 59 vorgesehen. Über die Ölablassschraube 59 kann eine entsprechende Ölablauföffnung geöffnet werden, über die das Öl 22 abgelassen werden kann.An oil drain plug 59 is provided in the bottom area of the housing 20 in the assembled state. A corresponding oil drain opening through which the oil 22 can be drained can be opened via the oil drain screw 59.

Im unteren Bereich des Gehäuses 20 ist auch der Ansatz 60 vorhanden, an dem der Ölfilter 62 befestigt wird. Über einen Ölfiltereinlasskanal 64, der im Gehäuse 20 angeordnet ist, wird das Öl 22 zunächst zu einem Thermostatventil 66 geleitet.In the lower area of the housing 20 there is also the extension 60 to which the oil filter 62 is attached. The oil 22 is first fed to a thermostatic valve 66 via an oil filter inlet channel 64 which is arranged in the housing 20.

Anstelle des Thermostatventils 66 kann eine Steuerungs- und/oder Regelungseinrichtung vorgesehen sein, mittels derer die Öltemperatur des im Gehäuse 20 befindlichen Öls 22 überwachbar und auf einen Sollwert einstellbar ist.Instead of the thermostat valve 66, a control and / or regulating device can be provided, by means of which the oil temperature of the oil 22 located in the housing 20 can be monitored and adjusted to a setpoint value.

Stromabwärts des Thermostatventils 66 ist sodann der Öleinlass des Ölfilters 62, der über eine zentrale Rückführleitung 68 das Öl 22 wieder zurück zur Schraube 18 oder zur Schraube 16, aber auch zum ölgeschmierten Lager 70 der Welle 14 führt. Im Bereich des Lagers 70 ist auch eine Düse 72 vorgesehen, die im Gehäuse 20 im Zusammenhang mit der Rückführleitung 68 vorgesehen ist.Downstream of the thermostatic valve 66 is the oil inlet of the oil filter 62, which leads the oil 22 back to the screw 18 or to the screw 16, but also to the oil-lubricated bearing 70 of the shaft 14 via a central return line 68. In the area of the bearing 70, a nozzle 72 is also provided, which is provided in the housing 20 in connection with the return line 68.

Der Kühler 74 ist am Ansatz 60 angeschlossen.The cooler 74 is connected to the extension 60.

Im oberen Bereich des Gehäuses 20 (bezogen auf den montierten Zustand) befindet sich ein Sicherheitsventil 76, über das ein zu großer Druck im Gehäuse 20 abgebaut werden kann.In the upper area of the housing 20 (in relation to the assembled state) there is a safety valve 76, via which an excessively high pressure in the housing 20 can be reduced.

Vor dem Mindestdruckventil 50 befindet sich eine Bypassleitung 78, die zu einem Entlastungsventil 80 führt. Über dieses Entlastungsventil 80 das mittels einer Verbindung mit der Luftzuführung 32 angesteuert wird kann Luft in den Bereich des Lufteinlasses 28 zurückgeführt werden. In diesem Bereich kann ein nicht näher gezeigtes Entlüftungsventil und auch eine Düse (Durchmesserveringerung der zuführenden Leitung) vorgesehen sein.A bypass line 78, which leads to a relief valve 80, is located upstream of the minimum pressure valve 50. Air can be fed back into the area of the air inlet 28 via this relief valve 80, which is controlled by means of a connection to the air supply 32. A vent valve (not shown in more detail) and also a nozzle (diameter reduction of the supply line) can be provided in this area.

Darüber hinaus kann ungefähr auf Höhe der Leitung 34 in der Außenwand des Gehäuses 20 ein Öllevelsensor 82 vorgesehen sein. Dieser Öllevelsensor 82 kann beispielsweise ein optischer Sensor sein und derart beschaffen und eingerichtet, dass anhand des Sensorsignals erkannt werden kann, ob der Ölstand im Betrieb oberhalb des Öllevelsensors 82 ist oder ob der Öllevelsensor 82 frei liegt und hierdurch der Ölstand entsprechend gefallen ist.In addition, an oil level sensor 82 can be provided approximately at the level of the line 34 in the outer wall of the housing 20. This oil level sensor 82 can be, for example, an optical sensor and can be designed and set up in such a way that the sensor signal can be used to identify whether the oil level is above the oil level sensor 82 during operation or whether the oil level sensor 82 is exposed and the oil level has fallen accordingly as a result.

Im Zusammenhang mit dieser Überwachung kann auch eine Alarmeinheit vorgesehen sein, die eine entsprechende Fehlermeldung oder Warnmeldung an den Nutzer des Systems ausgibt bzw. weiterleitet.In connection with this monitoring, an alarm unit can also be provided that outputs or forwards a corresponding error message or warning message to the user of the system.

Die Funktion des in Fig. 1 gezeigten Schraubenkompressors 10 ist dabei wie folgt:
Luft wird über den Lufteinlass 28 zugeführt und gelangt über das Rückschlagventil 30 zu den Schrauben 16, 18, wo die Luft komprimiert wird. Das komprimierte Luft-Öl-Gemisch, das mit einem Faktor zwischen 5- bis 16facher Komprimierung nach den Schrauben 16 und 18 durch die Auslassleitung 34 über das Steigrohr 36 aufsteigt, wird direkt auf den Temperaturfühler 38 geblasen.The function of the in Fig. 1 shown screw compressor 10 is as follows:
Air is supplied via the air inlet 28 and reaches the screws 16, 18 via the check valve 30, where the air is compressed. The compressed air-oil mixture, which rises with a factor of between 5 and 16-fold compression after the screws 16 and 18 through the outlet line 34 via the riser pipe 36, is blown directly onto the temperature sensor 38.

Die Luft, die noch teilweise Ölpartikel trägt, wird sodann über den Halter 40 in das Luftentölelement 42 geführt und gelangt, sofern der entsprechende Mindestdruck erreicht wird, in die Luftauslassleitung 51.The air, which still partially carries oil particles, is then guided via the holder 40 into the exhaust filter 42 and, if the corresponding minimum pressure is reached, reaches the air outlet line 51.

Das im Gehäuse 20 befindliche Öl 22 wird über den Ölfilter 62 und ggf. über den Wärmetauscher 74 auf Betriebstemperatur gehalten.The oil 22 located in the housing 20 is kept at operating temperature via the oil filter 62 and possibly via the heat exchanger 74.

Sofern keine Kühlung notwendig ist, wird der Wärmetauscher 74 nicht verwendet und ist auch nicht zugeschaltet.If no cooling is necessary, the heat exchanger 74 is not used and is also not switched on.

Die entsprechende Zuschaltung erfolgt über das Thermostatventil 68. Nach der Aufreinigung im Ölfilter 62 wird über die Leitung 68 Öl der Schraube 18 oder der Schraube 16, aber auch dem Lager 72 zugeführt. Die Schraube 16 oder die Schraube 18 wird über die Rückführleitung 52, 58 mit Öl 22 versorgt, hier erfolgt die Aufreinigung des Öls 22 im Luftentölelement 42.The corresponding connection takes place via the thermostatic valve 68. After the purification in the oil filter 62, oil is fed to the screw 18 or the screw 16, but also to the bearing 72, via the line 68. The screw 16 or the screw 18 is supplied with oil 22 via the return line 52, 58; here the oil 22 is purified in the exhaust filter 42.

Über den nicht näher gezeigten Elektromotor, der sein Drehmoment über die Welle 14 auf die Schraube 16 überträgt, die wiederum mit der Welle 18 kämmt, werden die Schrauben 16 und 18 des Schraubenkompressors 10 angetrieben.The screws 16 and 18 of the screw compressor 10 are driven by the electric motor, not shown in detail, which transmits its torque via the shaft 14 to the screw 16, which in turn meshes with the shaft 18.

Über das nicht näher gezeigte Entlastungsventil 80 wird sichergestellt, dass im Bereich der Zuleitung 32 nicht der hohe Druck, der im Betriebszustand beispielsweise ausgangsseitig der Schrauben 16, 18 herrscht, eingesperrt werden kann, sondern dass insbesondere beim Anlaufen des Kompressors im Bereich der Zuleitung 32 stets ein niedriger Eingangsdruck, insbesondere Atmosphärendruck, besteht. Andernfalls würde mit einem Anlaufen des Kompressors zunächst ein sehr hoher Druck ausgangsseitig der Schrauben 16 und 18 entstehen, der den Antriebsmotor überlasten würde.The relief valve 80, not shown in detail, ensures that in the area of the supply line 32, the high pressure that prevails in the operating state, for example on the outlet side of the screws 16, 18, cannot be locked in, but that especially when the compressor starts up in the area of the supply line 32 there is a low inlet pressure, in particular atmospheric pressure. Otherwise, when the compressor starts up, a very high pressure would initially arise on the output side of the screws 16 and 18, which would overload the drive motor.

Fig. 2 zeigt in schematischer Schnittdarstellung perspektivisch einen Schnitt durch den Schraubenkompressor 10. Fig. 2 shows a schematic sectional illustration in perspective of a section through the screw compressor 10.

Der Luftölabscheider-Halter 40 ist hier aus Aluminium gefertigt und auf der Außenseite des Gehäuses 20 des Schraubenkompressors 10 befestigt. Auf dem Luftölabscheider-Halter 40 ist der Luftölabscheider 42 bzw. das Luftentölelement 42 montiert.The air oil separator holder 40 is made here of aluminum and is fastened to the outside of the housing 20 of the screw compressor 10. The air oil separator 42 or the air / oil separator 42 is mounted on the air oil separator holder 40.

Weiter ist im Luftölabscheider-Halter 40 das Entlastungsventil 80 angeordnet. Der Ausgang des Entlastungsventils 80 ist über einen außerhalb des Gehäuses 20 verlaufenden Kunststoffschlauches 100 mit dem Lufteinlass 28 des Schraubenkompressors 10 verbunden, wodurch der Ausgang des Entlastungsventils 80 mit der Atmosphäre verbindbar ist.Furthermore, the relief valve 80 is arranged in the air oil separator holder 40. The outlet of the relief valve 80 is connected to the air inlet 28 of the screw compressor 10 via a plastic hose 100 running outside the housing 20, whereby the outlet of the relief valve 80 can be connected to the atmosphere.

Das Gehäuse 20 ist hier anders als der Luftölabscheider-Halter 40 aus Grauguss und damit aus einem anderen Material als der Luftölabscheider-Halter 40 gefertigt.The housing 20, unlike the air-oil separator holder 40, is made here of gray cast iron and thus of a different material than the air-oil separator holder 40.

Durch die Anordnung des Entlastungsventils 80 im Luftölabscheider-Halter 40, der aus Aluminium gefertigt ist, wird erreicht, dass dort entstehende Feuchtigkeitsniederschläge nicht zu Korrosion führen können, da der Luftölabscheider-Halter 40 aus nicht-korrosivem Material besteht.By arranging the relief valve 80 in the air oil separator holder 40, which is made of aluminum, it is achieved that moisture deposits that occur there cannot lead to corrosion, since the air oil separator holder 40 is made of non-corrosive material.

Durch das Verbinden des Ausgangs des Entlastungsventils 80 über den Kunststoffschlauch 100 mit dem Lufteinlass 28 wird weiter verhindert, dass die Verbindung zwischen Entlastungsventil 80 und dem Lufteinlass 28 durch das Gehäuse 20 geführt werden muss. Darüber hinaus ist bekanntermaßen eine Verbindungsleitung mit geringem Querschnitt anfällig für Feuchtigkeitsniederschlag und damit für Korrosion.By connecting the outlet of the relief valve 80 via the plastic hose 100 to the air inlet 28, it is further prevented that the connection between the relief valve 80 and the air inlet 28 has to be passed through the housing 20. In addition, a connecting line with a small cross section is known to be susceptible to moisture precipitation and thus to corrosion.

Durch den Umstand, dass die Verbindung mittels eines Kunststoffschlauches 100 hergestellt wird, wird Korrosion vermieden. Darüber hinaus kann gegebenenfalls bei einer Verstopfung der Verbindung dieser einfach ausgetauscht werden, da er außerhalb des Gehäuses 20 verläuft.The fact that the connection is established by means of a plastic hose 100 prevents corrosion. In addition, if the connection becomes blocked, it can simply be exchanged, since it runs outside the housing 20.

BEZUGSZEICHENLISTEREFERENCE LIST

1010
SchraubenkompressorScrew compressor
1212
BefestigungsflanschMounting flange
1414th
EingangswelleInput shaft
1616
SchraubenScrews
1818th
SchraubenScrews
2020th
Gehäusecasing
2222nd
Öloil
2424
EinlassstutzenInlet port
2626th
LuftfilterAir filter
2828
LufteinlassAir inlet
3030th
VentileinsatzValve insert
3232
LuftzuführkanalAir supply duct
3434
LuftauslassrohrAir outlet pipe
3636
SteigleitungRiser
3838
TemperaturfühlerTemperature sensor
4040
Halter für ein LuftentölelementHolder for an exhaust filter
4242
LuftentölelementExhaust filter
4444
Filtersieb bzw. bekannte Filter- bzw. ÖlabscheidevorrichtungenFilter sieve or known filter or oil separating devices
4646
LuftausgangsöffnungAir outlet opening
4848
Rückschlagventilcheck valve
5050
MindestdruckventilMinimum pressure valve
5151
LuftauslassAir outlet
5252
SteigleitungRiser
5454
Filter- und RückschlagventilFilter and check valve
5656
Düsejet
5858
ÖlrückführleitungOil return line
5959
ÖlablassschraubeOil drain plug
6060
Ansatzapproach
60a60a
äußerer Ringouter ring
60b60b
innerer Ringinner ring
6262
ÖlfilterOil filter
6464
ÖlfiltereinlasskanalOil filter inlet duct
6666
ThermostatventilThermostatic valve
6868
RückführleitungReturn line
7070
Lagerwarehouse
7272
Düsejet
7474
Kühler, WärmetauscherCooler, heat exchanger
7676
SicherheitsventilSafety valve
7878
BypassleitungBypass line
8080
EntlastungsventilRelief valve
8282
ÖllevelsensorOil level sensor
100100
KunststoffschlauchPlastic hose

Claims (5)

  1. A screw compressor (10) for a utility vehicle having at least one housing (20) and at least one air-oil separator holder (40) arranged on the housing (20), there being provided a relief valve (80) that is arranged in the air-oil separator holder (40) and by means of which the pressure inside the screw compressor (10) can be relieved, characterised in that air-oil separator holder (40) is manufactured from a non-corrosive material, the relief valve (80) being connected to the air inlet (28) of the screw compressor (10) and it being possible to connect the relief valve (80) with the atmosphere via the air inlet (28), the housing (20) consisting of a material other than that of the air-oil separator holder (40).
  2. A screw compressor (10) according to claim 1,
    characterised in that
    the non-corrosive material is composed at least partially of aluminium or is composed at least partially of an aluminium alloy.
  3. A screw compressor (10) according to claim 1,
    characterised in that
    at least part of the connection from the relief valve (80) to the air inlet (28) of the screw compressor (10) runs outside the housing (20) of the screw compressor (10).
  4. A screw compressor (10) according to claim 3,
    characterised in that
    at least part of the connection from the relief valve (80) to the air inlet (28) of the screw compressor (10) takes the form of a plastic hose (100).
  5. A screw compressor (10) according to any one of the preceding claims,
    characterised in that
    the housing (20) is made of a cast material, in particular of cast iron.
EP17769063.3A 2016-09-21 2017-09-19 Screw compressor for a utility vehicle Active EP3516231B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102016011432.0A DE102016011432A1 (en) 2016-09-21 2016-09-21 Screw compressor for a commercial vehicle
PCT/EP2017/073545 WO2018054861A1 (en) 2016-09-21 2017-09-19 Screw compressor for a utility vehicle

Publications (2)

Publication Number Publication Date
EP3516231A1 EP3516231A1 (en) 2019-07-31
EP3516231B1 true EP3516231B1 (en) 2020-12-23

Family

ID=59914467

Family Applications (1)

Application Number Title Priority Date Filing Date
EP17769063.3A Active EP3516231B1 (en) 2016-09-21 2017-09-19 Screw compressor for a utility vehicle

Country Status (7)

Country Link
US (1) US11286938B2 (en)
EP (1) EP3516231B1 (en)
JP (2) JP2019529798A (en)
KR (2) KR20190043171A (en)
CN (1) CN109937304B (en)
DE (1) DE102016011432A1 (en)
WO (1) WO2018054861A1 (en)

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Also Published As

Publication number Publication date
KR20190043171A (en) 2019-04-25
CN109937304B (en) 2021-06-04
BR112019005067A2 (en) 2019-06-18
KR20210008166A (en) 2021-01-20
WO2018054861A1 (en) 2018-03-29
JP2021073408A (en) 2021-05-13
CN109937304A (en) 2019-06-25
EP3516231A1 (en) 2019-07-31
JP2019529798A (en) 2019-10-17
US20190338776A1 (en) 2019-11-07
DE102016011432A1 (en) 2018-03-22
US11286938B2 (en) 2022-03-29

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