EP3516224B1 - Screw compressor for a utility vehicle - Google Patents

Screw compressor for a utility vehicle Download PDF

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Publication number
EP3516224B1
EP3516224B1 EP17777197.9A EP17777197A EP3516224B1 EP 3516224 B1 EP3516224 B1 EP 3516224B1 EP 17777197 A EP17777197 A EP 17777197A EP 3516224 B1 EP3516224 B1 EP 3516224B1
Authority
EP
European Patent Office
Prior art keywords
oil
housing
screw compressor
magnet
screw
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
EP17777197.9A
Other languages
German (de)
French (fr)
Other versions
EP3516224A1 (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 EP3516224A1 publication Critical patent/EP3516224A1/en
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Publication of EP3516224B1 publication Critical patent/EP3516224B1/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
    • 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
    • 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
    • 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
    • F04C29/025—Lubrication; Lubricant separation using a lubricant pump
    • 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
    • F04C29/04—Heating; Cooling; Heat insulation
    • 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
    • F04C2240/00—Components
    • F04C2240/80—Other components
    • F04C2240/809—Lubricant sump
    • 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
    • F04C2270/00—Control; Monitoring or safety arrangements
    • F04C2270/19—Temperature
    • 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
    • F04C2270/00—Control; Monitoring or safety arrangements
    • F04C2270/24—Level of liquid, e.g. lubricant or cooling liquid
    • 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
    • F04C2280/02—Preventing solid deposits in pumps, e.g. in vacuum pumps with chemical vapour deposition [CVD] processes
    • 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
    • F05C2251/00—Material properties
    • F05C2251/12—Magnetic properties

Definitions

  • the present invention relates to a screw compressor for a utility vehicle.
  • 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.
  • Screw compressors usually have oil filters in order to filter out any particles in the screw compressor and to ensure that the screws in particular are lubricated.
  • oil filters in order to filter out any particles in the screw compressor and to ensure that the screws in particular are lubricated.
  • Such an arrangement is for example from DE 42 34 391 B4 known.
  • a screw compressor for a commercial vehicle with the features of claim 1. According to this, it is provided that a screw compressor for a commercial vehicle is provided with a housing, with an oil sump being provided in the housing when the screw compressor is ready for operation and installed and with the A magnet is arranged in the oil sump.
  • the invention is based on the basic idea that in the present design mainly magnetic particles contaminate the oil and that such particles must be filtered out by an oil filter.
  • an oil filter In order to prevent an oil filter from clogging, it makes sense to use an alternative and / or additional option for a particle trap. This is achieved by a magnet. Due to the arrangement of the magnet in the oil sump, preferably at the deepest point in the oil sump, it is achieved that the number of magnetic particles in the oil is reliably reduced The oil filter can thus be made smaller or even omitted entirely.
  • the screw compressor does not have an oil filter. This simplifies the construction of the screw compressor, since one component is omitted and, moreover, fewer oil lines have to be provided in the housing of the screw compressor or also external oil lines around the screw compressor. There is also no wear part of the screw compressor, since the oil filter would have to be replaced after a certain period of time due to clogging. This is no longer necessary.
  • the housing has a housing body and a housing cover, the magnet being arranged in the housing body.
  • the arrangement in the housing body enables simple and reliable fastening, but also assembly of the magnet. Even when the screw compressor is serviced and overhauled, the magnet is easily accessible and can easily be cleaned or replaced.
  • the housing has a housing body and a housing cover, the magnet being arranged in the housing cover.
  • a baffle plate is arranged in the housing and that the magnet is arranged below the baffle plate in the oil when the screw compressor is ready for operation and installed.
  • the baffle makes it possible for the movement of the oil in the housing to be restricted and the effect of centrifugal forces and inertial forces reduced when the screw compressor is in motion, especially when the utility vehicle is in operation and when driving.
  • the arrangement of the magnet below the baffle plate when the screw compressor is ready for operation and installed ensures that the magnet is essentially always bathed in the oil and can thus perform its function as a particle trap.
  • the magnet can be designed as an essentially cylindrical disk. This enables simple manufacture, but at the same time also a comparatively large surface to which particles can adhere. However, the magnet can also have any other shape.
  • the magnet can be fastened in the housing by means of a spacer. This makes it possible for the oil to wash around both the front and the rear of the magnet.
  • the spacer can have a screw bolt and / or a spacer element.
  • the spacer element can be, for example, a spacer sleeve pushed onto a screw bolt.
  • 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. Via the oil drain screw 59, a corresponding oil drain opening are opened through which the oil 22 can be drained.
  • 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 constructed and set up such that it can be recognized on the basis of the sensor signal 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 times 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, always 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 perspective view of part of the screw compressor 10, namely the housing body 20a of the housing 20.
  • a corresponding receptacle is provided in the housing body 20a, the rotor housing 20b for the two screws 16 and 18.
  • a baffle 100 with oil passage slots 102 is provided below this rotor housing 20b below this rotor housing 20b .
  • the oil sump of the oil 22 is located below the baffle plate 100 in the assembled and operationally ready state.
  • a magnet 104 is provided in the oil sump of the oil 22 in the operationally ready and assembled state.
  • the magnet 104 is fastened to the housing body 20a by means of a spacer 106, which here consists of a screw bolt 108 and a spacer sleeve 110 not shown in detail.
  • the screw compressor 10 has in Fig. 2
  • the embodiment shown does not have an oil filter 62. This is omitted and is completely replaced by the magnet 104.
  • the magnet 104 is designed as a substantially cylindrical disk.
  • the magnet 104 is completely surrounded by the oil 22 with the exception of the small area on the housing body 20a facing the small area in which the spacer 106 passes through the magnet 104.
  • the housing cover of the screw compressor 10 is in Fig. 2 Not shown.
  • the function of the magnet 104 can be described as follows: The magnetic particles floating in the oil 22, which get into the oil 22, for example through abrasion of the intermeshing screws 16 and 18 or the bearings or other moving parts of the screw compressor 10, are removed from the oil 22 by the magnet 104, which acts as a particle catcher here filtered out and tightened.
  • the magnet 104 thus acts as a particle trap and thereby cleans the oil 22.
  • the oil filter 62 can thus be dispensed with, since it is no longer necessary to carry out further filtering of the oil 22.

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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)
  • Rotary Pumps (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)

Description

Die vorliegende Erfindung betrifft einen Schraubenkompressor für ein Nutzfahrzeug.The present invention relates to a screw compressor for a utility vehicle.

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.

Üblicherweise weisen Schraubenkompressoren Ölfilter auf, um etwaige Partikel im Schraubenkompressor herauszufiltern und die Schmierung insbesondere der Schrauben zu gewährleisten. Eine derartige Anordnung ist beispielsweise aus der DE 42 34 391 B4 bekannt.Screw compressors usually have oil filters in order to filter out any particles in the screw compressor and to ensure that the screws in particular are lubricated. Such an arrangement is for example from DE 42 34 391 B4 known.

Aus der CN 205370894 U ist ein Schraubenkompressor mit einem Magnet zur Herausfilterung von Partikeln aus dem Öl im Ölsumpf bekannt.From the CN 205 370 894 U a screw compressor with a magnet for filtering out particles from the oil in the oil sump is known.

Aus der DE 10 2010 015 147 A1 ist eine Ölschraubdämpfungseinrichtung für einen Schraubenverdichter bekannt, wobei hier ein Schwallblech zum Einsatz kommt.From the DE 10 2010 015 147 A1 an oil screw damping device for a screw compressor is known, a baffle plate being used here.

Wünschenswert wäre es jedoch, den Aufbau eines Schraubenkompressors weiter zu vereinfachen, ohne dabei jedoch die Betriebssicherheit des Schraubenkompressors zu verringern.However, it would be desirable to further simplify the structure of a screw compressor without, however, reducing the operational reliability of the screw compressor.

Es ist daher die Aufgabe der vorliegenden Erfindung, einen Schraubenkompressor für ein Nutzfahrzeug der eingangs genannten Art in vorteilhafter Weise weiterzubilden, insbesondere dahingehend, dass dieser in seinem Aufbau weiter vereinfacht werden kann, ohne dabei jedoch seine Betriebssicherheit zu verringern.It is therefore the object of the present invention to develop a screw compressor for a utility vehicle of the type mentioned at the outset in an advantageous manner, in particular in such a way that its structure can be further simplified without, however, reducing its operational reliability.

Diese Aufgabe wird erfindungsgemäß gelöst durch einen Schraubenkompressor für ein Nutzfahrzeug mit den Merkmalen des Anspruchs 1. Danach ist vorgesehen, dass ein Schraubenkompressor für ein Nutzfahrzeug mit einem Gehäuse versehen, wobei im betriebsbereiten und montierten Zustand des Schraubenkompressors im Gehäuse ein Ölsumpf vorgesehen ist und wobei im Ölsumpf ein Magnet angeordnet ist.According to the invention, this object is achieved by a screw compressor for a commercial vehicle with the features of claim 1. According to this, it is provided that a screw compressor for a commercial vehicle is provided with a housing, with an oil sump being provided in the housing when the screw compressor is ready for operation and installed and with the A magnet is arranged in the oil sump.

Die Erfindung basiert auf dem Grundgedanken, dass bei der vorliegenden Bauweise hauptsächlich magnetische Partikel das Öl verunreinigen und dass durch einen Ölfilter derartige Partikel herausgefiltert werden müssen. Um ein Zusetzen eines Ölfilters zu verhindern, ist es sinnvoll, eine alternative und/oder zusätzliche Möglichkeit eines Partikelfängers einzusetzen. Dies wird durch einen Magnet erreicht. Durch die Anordnung des Magneten im Ölsumpf, vorzugsweise an der tiefsten Stelle im Ölsumpf, wird erreicht, dass zuverlässig die Partikelanzahl magnetischer Partikel im Öl reduziert wird. Der Ölfilter kann dadurch kleiner ausgebildet sein oder sogar gänzlich entfallen.The invention is based on the basic idea that in the present design mainly magnetic particles contaminate the oil and that such particles must be filtered out by an oil filter. In order to prevent an oil filter from clogging, it makes sense to use an alternative and / or additional option for a particle trap. This is achieved by a magnet. Due to the arrangement of the magnet in the oil sump, preferably at the deepest point in the oil sump, it is achieved that the number of magnetic particles in the oil is reliably reduced The oil filter can thus be made smaller or even omitted entirely.

Insbesondere kann vorgesehen sein, dass der Schraubenkompressor keinen Ölfilter aufweist. Hierdurch wird der Aufbau des Schraubenkompressors vereinfacht, da eine Komponente wegfällt und darüber hinaus weniger Ölleitungen im Gehäuse des Schraubenkompressors oder auch externe Ölleitungen um den Schraubenkompressor herum vorgesehen werden müssen. Auch entfällt ein Verschleißteil des Schraubenkompressors, da der Ölfilter nach einer gewissen Standzeit aufgrund Zusetzens ausgetauscht werden müsste. Dies ist nun nicht mehr erforderlich.In particular, it can be provided that the screw compressor does not have an oil filter. This simplifies the construction of the screw compressor, since one component is omitted and, moreover, fewer oil lines have to be provided in the housing of the screw compressor or also external oil lines around the screw compressor. There is also no wear part of the screw compressor, since the oil filter would have to be replaced after a certain period of time due to clogging. This is no longer necessary.

Darüber hinaus kann vorgesehen sein, dass das Gehäuse einen Gehäusekorpus und einen Gehäusedeckel aufweist, wobei der Magnet im Gehäusekorpus angeordnet ist. Durch die Anordnung im Gehäusekorpus wird eine einfache und zuverlässige Befestigung, aber auch Montage des Magneten ermöglicht. Auch bei einer Wartung und Revision des Schraubenkompressors ist der Magnet somit einfach zugänglich und kann leicht gereinigt oder auch ausgetauscht werden.In addition, it can be provided that the housing has a housing body and a housing cover, the magnet being arranged in the housing body. The arrangement in the housing body enables simple and reliable fastening, but also assembly of the magnet. Even when the screw compressor is serviced and overhauled, the magnet is easily accessible and can easily be cleaned or replaced.

Eine Montage am Gehäusedeckel ist ebenfalls möglich. Insbesondere kann vorgesehen sein, dass das Gehäuse einen Gehäusekorpus und einen Gehäusedeckel aufweist, wobei der Magnet im Gehäusedeckel angeordnet ist.Mounting on the housing cover is also possible. In particular, it can be provided that the housing has a housing body and a housing cover, the magnet being arranged in the housing cover.

Erfindungsgemäß ist vorgesehen, dass im Gehäuse ein Schwallblech angeordnet ist und dass der Magnet im betriebsbereiten und montierten Zustand des Schraubenkompressors unterhalb des Schwallbleches im Öl angeordnet ist. Durch das Schwallblech wird ermöglicht, dass bei Bewegung des Schraubenkompressors insbesondere im Betrieb und bei Fahrt des Nutzfahrzeugs die Beweglichkeit des Öles im Gehäuse eingeschränkt und der Effekt von Fliehkräften und Trägheitskräften verringert wird. Durch die Anordnung des Magneten im betriebsbereiten und montierten Zustand des Schraubenkompressors unterhalb des Schwallbleches wird sichergestellt, dass der Magnet im Wesentlichen stets umspült vom Öl ist und somit seiner Funktion als Partikelfänger nachgehen kann.According to the invention it is provided that a baffle plate is arranged in the housing and that the magnet is arranged below the baffle plate in the oil when the screw compressor is ready for operation and installed. The baffle makes it possible for the movement of the oil in the housing to be restricted and the effect of centrifugal forces and inertial forces reduced when the screw compressor is in motion, especially when the utility vehicle is in operation and when driving. The arrangement of the magnet below the baffle plate when the screw compressor is ready for operation and installed ensures that the magnet is essentially always bathed in the oil and can thus perform its function as a particle trap.

Der Magnet kann als im Wesentlichen zylindrische Scheibe ausgebildet sein Dies ermöglicht eine einfache Herstellung, aber gleichzeit auch eine vergleichsweise große Oberfläche, an der sich Partikel anhaften können. Der Magnet kann aber auch jede beliebige andere Form aufweisen.The magnet can be designed as an essentially cylindrical disk. This enables simple manufacture, but at the same time also a comparatively large surface to which particles can adhere. However, the magnet can also have any other shape.

Der Magnet kann mittels eines Abstandshalters im Gehäuse befestigt sein. Hierdurch wird es möglich, dass sowohl die Vorderseite als auch die Rückseite des Magneten vom Öl umspült sein können.The magnet can be fastened in the housing by means of a spacer. This makes it possible for the oil to wash around both the front and the rear of the magnet.

Der Abstandshalter kann ein Schraubbolzen und/oder ein Distanzelement aufweisen. Bei dem Distanzelement kann es sich beispielsweise um eine auf einen Schraubbolzen aufgeschobene Distanzhülse handeln. Die Verwendung von Schraubbolzen und/oder eines Distanzelementes als Abstandshalter ermöglicht eine einfache und zuverlässige Befestigung des Magneten bei gleichzeitiger Gewährleistung der Funktion, dass der Magnet einen gewissen Abstand von der Gehäuseinnenwand bzw. von der Gehäusedeckelinnenwand aufweisen sollte, um eine vollständige Umspülung des Magneten zu gewährleisten.The spacer can have a screw bolt and / or a spacer element. The spacer element can be, for example, a spacer sleeve pushed onto a screw bolt. The use of screw bolts and / or a spacer element as a spacer enables simple and reliable fastening of the magnet while at the same time ensuring the function that the magnet should have a certain distance from the inner wall of the housing or from the inner wall of the housing cover in order to ensure that the magnet is completely flushed .

Weitere Einzelheiten und Vorteile der Erfindung sollen nun anhand eines in der Zeichnung dargestellten Ausführungsbeispiels näher erläutert werden.Further details and advantages of the invention will now be explained in more detail with reference to an embodiment shown in the drawing.

Es zeigen:

Fig. 1
eine schematische Schnittzeichnung durch einen erfindungsgemäßen Schraubenkompressor; und
Fig. 2
eine perspektivische Detailansicht auf den Gehäusedeckel des Schraubenkompressors.
Show it:
Fig. 1
a schematic sectional drawing through a screw compressor according to the invention; and
Fig. 2
a perspective detailed view of the housing cover 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. Via the oil drain screw 59, a corresponding oil drain opening are opened through which the oil 22 can be drained.

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 constructed and set up such that it can be recognized on the basis of the sensor signal 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 times 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, always 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 perspektivischer Ansicht einen Teil des Schraubenkompressors 10, nämlich den Gehäusekorpus 20a des Gehäuses 20. Fig. 2 shows a perspective view of part of the screw compressor 10, namely the housing body 20a of the housing 20.

Wie dies aus Fig. 2 ersichtlich ist, ist im Gehäusekorpus 20a eine entsprechende Aufnahme, das Rotorengehäuse 20b für die beiden Schrauben 16 und 18 vorgesehen.Like this Fig. 2 As can be seen, a corresponding receptacle is provided in the housing body 20a, the rotor housing 20b for the two screws 16 and 18.

Darüber hinaus ist im montierten und betriebsbereiten Zustand (Fig. 2 zeigt die entsprechende Orientierung des Gehäusekorpus 20a) unterhalb dieses Rotorengehäuses 20b ein Schwallblech 100 mit Öldurchlassschlitzen 102 vorgesehen.In addition, in the assembled and operational state ( Fig. 2 shows the corresponding orientation of the housing body 20a) below this rotor housing 20b a baffle 100 with oil passage slots 102 is provided.

Unterhalb des Schwallbleches 100 befindet sich im montierten und betriebsbereiten Zustand der Ölsumpf des Öles 22. Am im Wesentlichen tiefsten Punkt des Gehäuses 20 ist dort im Ölsumpf des Öles 22 im betriebsbereiten und montierten Zustand ein Magnet 104 vorgesehen.The oil sump of the oil 22 is located below the baffle plate 100 in the assembled and operationally ready state. At the essentially lowest point of the housing 20, a magnet 104 is provided in the oil sump of the oil 22 in the operationally ready and assembled state.

Der Magnet 104 ist mittels eines Abstandshalters 106, der hier aus einem Schraubbolzen 108 und einer nicht näher gezeigten Distanzhülse 110 besteht, am Gehäusekorpus 20a befestigt.The magnet 104 is fastened to the housing body 20a by means of a spacer 106, which here consists of a screw bolt 108 and a spacer sleeve 110 not shown in detail.

Der Schraubenkompressor 10 weist im in Fig. 2 gezeigten Ausführungsbeispiel keinen Ölfilter 62 auf. Dieser entfällt und wird vollständig durch den Magneten 104 ersetzt.The screw compressor 10 has in Fig. 2 The embodiment shown does not have an oil filter 62. This is omitted and is completely replaced by the magnet 104.

Der Magnet 104 ist als im Wesentlichen zylindrische Scheibe ausgebildet.The magnet 104 is designed as a substantially cylindrical disk.

Der Magnet 104 ist weiter vollständig vom Öl 22 umspült mit Ausnahme des auf der dem Gehäusekorpus 20a zugewandten kleinen Bereichs, an dem der Abstandshalter 106 durch den Magneten 104 hindurchtritt.The magnet 104 is completely surrounded by the oil 22 with the exception of the small area on the housing body 20a facing the small area in which the spacer 106 passes through the magnet 104.

Der Gehäusedeckel des Schraubenkompressors 10 ist in Fig. 2 nicht gezeigt.The housing cover of the screw compressor 10 is in Fig. 2 Not shown.

Die Funktion des Magneten 104 lässt sich wie folgt beschreiben :
Die im Öl 22 schwimmenden magnetischen Partikel, die beispielsweise durch Abrieb der miteinander kämmenden Schrauben 16 und 18 oder der Lager oder sonstiger bewegter Teile des Schraubenkompressors 10 ins Öl 22 gelangen, werden durch den Magneten 104, der hier als Partikelfänger agiert, aus dem Öl 22 heraus ausgefiltert und angezogen.The function of the magnet 104 can be described as follows:
The magnetic particles floating in the oil 22, which get into the oil 22, for example through abrasion of the intermeshing screws 16 and 18 or the bearings or other moving parts of the screw compressor 10, are removed from the oil 22 by the magnet 104, which acts as a particle catcher here filtered out and tightened.

Der Magnet 104 agiert somit als Partikelfänger und reinigt hierdurch das Öl 22.The magnet 104 thus acts as a particle trap and thereby cleans the oil 22.

Sämtliche Partikel, die somit beispielsweise die miteinander kämmenden Schrauben 16, 18 beschädigen könnten, werden somit durch den Magneten 104 herausgefiltert.All particles that could damage the intermeshing screws 16, 18, for example, are thus filtered out by the magnet 104.

Der Ölfilter 62 kann dadurch entfallen, da es nun nicht mehr notwendig ist, eine weitere Filterung des Öles 22 vorzunehmen.The oil filter 62 can thus be dispensed with, since it is no longer necessary to carry out further filtering of the oil 22.

BEZUGSZEICHENLISTEREFERENCE LIST

1010
SchraubenkompressorScrew compressor
1212
BefestigungsflanschMounting flange
1414th
EingangswelleInput shaft
1616
SchraubenScrews
1818th
SchraubenScrews
2020th
Gehäusecasing
20b20b
RotorengehäuseRotor housing
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
Lagercamp
7272
Düsejet
7474
Kühler, WärmetauscherCooler, heat exchanger
7676
SicherheitsventilSafety valve
7878
BypassleitungBypass line
8080
EntlastungsventilRelief valve
8282
ÖllevelsensorOil level sensor
100100
SchwallblechBaffle plate
102102
ÖldurchlassschlitzeOil passage slots
104104
Magnetmagnet
106106
AbstandshalterSpacers
108108
SchraubbolzenBolt
110110
DistanzhülseSpacer sleeve

Claims (7)

  1. Screw compressor (10) for a utility vehicle, having a housing (20), wherein, in the operationally ready and assembled state of the screw compressor (10), an oil sump is provided in the housing (20), and wherein a magnet (104) is arranged in the oil sump,
    characterized
    in that a baffle plate (100) is arranged in the housing (20), and in that, in the operationally ready and assembled state of the screw compressor (10), the magnet (104) is arranged below the baffle plate (100) in the oil (22).
  2. Screw compressor (10) according to Claim 1,
    characterized in that
    the screw compressor (10) has no oil filter (62).
  3. Screw compressor (10) according to Claim 1 or Claim 2,
    characterized in that
    the housing (20) has a housing body (20a) and a housing cover, wherein the magnet (104) is arranged in the housing body (20a).
  4. Screw compressor (10) according to any of the preceding claims,
    characterized in that
    the housing (20) has a housing body (20a) and a housing cover, wherein the magnet (104) is arranged in the housing cover.
  5. Screw compressor (10) according to any of the preceding claims,
    characterized in that
    the magnet (104) is formed as a substantially cylindrical disk.
  6. Screw compressor (10) according to any of the preceding claims,
    characterized in that
    the magnet (104) is fastened in the housing (20) by means of a spacer (106).
  7. Screw compressor (10) according to Claim 6,
    characterized in that
    the spacer (106) has a screw bolt (108) and/or a distancing element (110).
EP17777197.9A 2016-09-21 2017-09-19 Screw compressor for a utility vehicle Active EP3516224B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102016011395.2A DE102016011395A1 (en) 2016-09-21 2016-09-21 Screw compressor for a commercial vehicle
PCT/EP2017/073551 WO2018054866A1 (en) 2016-09-21 2017-09-19 Screw compressor for a utility vehicle

Publications (2)

Publication Number Publication Date
EP3516224A1 EP3516224A1 (en) 2019-07-31
EP3516224B1 true EP3516224B1 (en) 2020-08-19

Family

ID=59982347

Family Applications (1)

Application Number Title Priority Date Filing Date
EP17777197.9A Active EP3516224B1 (en) 2016-09-21 2017-09-19 Screw compressor for a utility vehicle

Country Status (8)

Country Link
US (1) US11994129B2 (en)
EP (1) EP3516224B1 (en)
JP (1) JP2019529801A (en)
KR (1) KR20190049845A (en)
CN (1) CN109937301B (en)
BR (1) BR112019005059A2 (en)
DE (1) DE102016011395A1 (en)
WO (1) WO2018054866A1 (en)

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EP3623630B1 (en) * 2018-09-13 2020-07-29 Pfeiffer Vacuum Gmbh Vacuum pump

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Also Published As

Publication number Publication date
US20190211826A1 (en) 2019-07-11
BR112019005059A2 (en) 2019-06-18
US11994129B2 (en) 2024-05-28
KR20190049845A (en) 2019-05-09
WO2018054866A1 (en) 2018-03-29
CN109937301B (en) 2021-05-28
CN109937301A (en) 2019-06-25
DE102016011395A1 (en) 2018-03-22
EP3516224A1 (en) 2019-07-31
JP2019529801A (en) 2019-10-17

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