EP3578817A1 - Compresseur, pompe à chaleur ou installation de climatisation ou machine de réfrigération et procédé de compression - Google Patents

Compresseur, pompe à chaleur ou installation de climatisation ou machine de réfrigération et procédé de compression Download PDF

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Publication number
EP3578817A1
EP3578817A1 EP19178725.8A EP19178725A EP3578817A1 EP 3578817 A1 EP3578817 A1 EP 3578817A1 EP 19178725 A EP19178725 A EP 19178725A EP 3578817 A1 EP3578817 A1 EP 3578817A1
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EP
European Patent Office
Prior art keywords
valve
outlet
oil
inlet
fluid
Prior art date
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Granted
Application number
EP19178725.8A
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German (de)
English (en)
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EP3578817B1 (fr
Inventor
Thore Oltersdorf
Clemens Dankwerth
Simon Braungardt
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Fraunhofer Gesellschaft zur Forderung der Angewandten Forschung eV
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Fraunhofer Gesellschaft zur Forderung der Angewandten Forschung eV
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Publication of EP3578817A1 publication Critical patent/EP3578817A1/fr
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
    • F04B39/04—Measures to avoid lubricant contaminating the pumped fluid
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
    • F04B39/16—Filtration; Moisture separation

Definitions

  • the invention relates to a compressor having a compression device with an inlet and an outlet and with an inlet-side collector and an outlet-side collector, wherein the compression device is adapted to convey a fluid from the inlet-side collector into the outlet-side collector. Furthermore, the invention relates to a heat pump equipped with such a compressor, air conditioning or refrigeration machine and a method for compressing a fluid. Devices and methods of this type can be used in particular for the compression of a refrigerant, which transports useful heat in heat pumps, air conditioners or refrigerators between an evaporator and a condenser.
  • this known compressor has the disadvantage that the oil separation takes place before the compression.
  • the known compressor prevents the accumulation of Oil in the components of the heat pump, air conditioning or chiller.
  • the purified refrigerant is immediately contaminated in the subsequent compression, contamination of subsequent components with oil is not reliably prevented.
  • Piping, condenser and evaporator can be contaminated with a permanent layer of oil, which sets as a mass balance between the entry of the contaminated refrigerant and the discharge by the recirculating refrigerant. This oil film can lead to thermal resistance, so that the performance of the device provided with the known compressor can drop.
  • the invention is therefore based on the object to provide a compressor and a heat pump equipped with it, air conditioning or refrigeration machine with improved performance.
  • a compressor with at least one compression device wherein the compression device has at least one inlet and at least one outlet.
  • the compression device can be, for example, a conventional screw compressor, a rotary compressor, a reciprocating compressor, a scroll compressor, a rotary vane compressor, a swash plate compressor or another compression device known per se. This is provided at the inlet of a fluid, in particular a refrigerant, at a comparatively low pressure and low temperature. This is conveyed in the compression device and thereby compressed, so that this with higher Pressure and sometimes higher temperature is discharged through the outlet of the compression device.
  • the compression device usually has an oil supply.
  • This oil is used on the one hand for lubrication, ie for friction reduction and wear protection of the moving parts of the compression device.
  • the oil can also be used for gap sealing, so that undesired transfer of the fluid to be compressed from the high-pressure side to the low-pressure side of the compression device is avoided or at least reduced.
  • the compressor according to the invention further comprises an inlet-side collector and an outlet-side collector.
  • the collector in the sense of the present description is a circumscribed volume, for example a part of the housing of the compressor or a separate memory.
  • the inlet side collector is supplied to the fluid to be compressed or refrigerant.
  • the compression device sucks the gas from the inlet side header, compresses it, and supplies it to the outlet side header via its outlet.
  • the outlet-side collector is also an enclosed, pressure-resistant volume, for example a housing part or a separate pressure accumulator in the line system of the device provided with the compressor. On the outlet-side collector pipes can be connected, which supply the downstream components with the pressurized fluid or refrigerant.
  • the compression device and optionally also the associated drive means can be arranged in the inlet-side collector. In other embodiments of the invention, the compression device and optionally also the drive means required for this purpose can be arranged in the outlet-side collector. As a result, the compression device and its drive means are surrounded by the passing fluid or refrigerant and are thereby cooled. In some embodiments of the invention can be dispensed with a separate cooling by air or liquid.
  • the oil lubrication and oil seal of the compression device has the effect that oil is discharged to a small extent from the compression device. This oil is then conveyed together with the pumped fluid in the outlet side collector.
  • the filter element is adapted to at least partially receive the oil from the fluid.
  • a plurality of filter elements can also be cascaded, so that they are flowed through by the fluid sequentially.
  • a plurality of filter elements may be arranged in parallel, so that each filter element is only flowed through by a partial flow of the fluid.
  • the oil absorbed by the filter element is aggregated into larger droplets in the filter element, which are then transported by gravity in a collection point in the outlet side collector.
  • the collection point may, in some embodiments of the invention, be the lowest point of the outlet-side header, so that the oil deposited on the walls of the outlet-side header collects there as well. In addition, can be dispensed in this way on a separate conveyor within the collector.
  • At the collection point at least one return line is used, which is set up to supply the oil from the collection point to an oil sump and / or the compression device.
  • at least one valve with which the return line can be closed is located on or in the return line.
  • the valve may be selected from a float valve and / or a solenoid valve and / or a shape memory valve and / or a valve driven by a motor such as a stepping motor or a linear motor.
  • a float valve has the advantage that this can act automatically without complex electronic control. The float opens the valve when a predefinable first oil level is reached and closes the valve when it falls below a predefinable second oil level, so that the oil is reliably returned and nevertheless pressure losses of the fluid to be pumped are avoided.
  • a solenoid valve and / or a motor-driven valve can be present, which determines the amount of oil in the collection point and opens the valve either for a predeterminable time or to below the oil level in the collection point when reaching a predetermined amount.
  • the valve can be opened by an electronic control or regulation time-dependent or volume flow-dependent, for example, after a certain period of operation or after a certain amount of fluid delivered.
  • the valve may further include a spring which acts on the valve in the opening direction with a spring force.
  • a spring can compensate for the force acting on the float due to the pressure difference between the outlet-side header and the inlet-side header, so that lower actuation forces are sufficient to open the float valve, which can be applied by a smaller float.
  • such a spring has the effect that when switching off the compressor and thus reducing the pressure difference between the inlet side and the outlet side collector, the float valve is opened by the spring, so that in the collection point remaining oil reliably removed when putting the compressor off in an oil sump becomes.
  • the spring may include or consist of a shape memory alloy.
  • a shape memory alloy makes it possible to give a spring temperature-dependent two different shapes or lengths.
  • the filter element may in some embodiments of the invention include or consist of a coalescer. In other embodiments of the invention, the filter element may include or consist of a mass force separator. In still other embodiments of the invention, the filter element may include both a coalescer and a mass force separator.
  • a coalescence separator contains at least one porous material which can be flowed through by the fluid, wherein the oil mist contained in the fluid is at least partially deposited on the inner surfaces of the pores or interspaces contained in the porous filter material. Then, this oil mist can aggregate to larger droplets, which is subsequently expelled from the filter element gravity driven or assisted by the fluid flow.
  • the filter element may contain a fiber mat, a woven fabric, a knitted fabric or a nonwoven fabric.
  • the filter element may include or consist of a plurality of expanded metal meshes, an open cell foam, or a packing.
  • the filter element may contain or consist of a metal, plastic or glass fibers.
  • the surfaces of the materials forming the filter element may be oleophilic or oleophobic.
  • the filter element may, in some embodiments, retain more than 90% of the oil in the passing mass flow.
  • a mass force separator is based on a mechanical structure which leads to the flow deflection.
  • the flow can be deflected in such a way that the oil mist is at least partially precipitated at the structures used for the deflection, where it is aggregated into larger droplets and subsequently fed to the collection point by gravity.
  • the mass-flow separator can thus contain or consist of at least one baffle plate and / or a cyclone and / or a pipe bend.
  • a coalescence separator may comprise at least a first layer and at least one second layer, wherein the first layer is selected from a nonwoven and / or a porous shaped body having a first pore size and the second layer is selected from a nonwoven or a shaped body having a second pore size or a perforated material layer.
  • the second pore size may be larger than the first one Pore size, so that the separation on the one hand and the transport of the oil droplets by gravity and / or capillary forces on the other hand takes place in spatially separated layers of Koaleszenzabscheiders.
  • a perforated material layer may contain a metal or plastic and be provided with regular or irregular holes. In some embodiments of the invention, such a material layer may further comprise fluid channels which reliably discharge the oil discharged from the first layer into the collection point.
  • the coalescence separator may further comprise a third layer, which in turn is selected from a nonwoven or a shaped article having the second pore size or a perforated material layer.
  • a third layer which in turn is selected from a nonwoven or a shaped article having the second pore size or a perforated material layer.
  • the bores in the flow direction of the fluid can be offset from one another, so that the path length of the flow in the second layer increases and thereby the oil separation is improved.
  • the holes may be arranged one above the other in the flow direction and in this way oppose the flow of the fluid to a lower flow resistance.
  • the compressor according to the invention may comprise a housing which is divided with at least one partition into at least two sub-volumes, one sub-volume forming the inlet-side header and the other sub-volume forming the outlet-side header. This does not exclude that further partitions are present, which separate further subvolumes, for example, to form an oil sump or an electrical connection box or for receiving drive means or control electronics for the at least one compression device and / or the valve.
  • FIG. 1 shows a first embodiment of a compressor according to the invention in section.
  • the compressor 1 includes a housing 3, which is made of metal or plastic, for example can be made.
  • the housing 3 may be made, for example, as a cast or deep-drawn part of a steel or aluminum sheet.
  • the housing 3 has an approximately round base and thus an overall approximately cylindrical appearance.
  • the housing in the bottom region on a mounting flange 37, with which the housing can be mounted in a car or airplane or a building.
  • the invention is not limited to this form of housing.
  • a partition wall 35 which divides the interior of the housing 3 into two sub-volumes.
  • a partial volume forms the inlet-side header 31 and the other partial volume forms the outlet-side header 32.
  • the fluid to be compressed for example a refrigerant, enters the inlet-side header 31 via a first connecting piece 311.
  • An optional baffle 312 may be located in front of the first port 311 to direct and control the flow of the incoming fluid. From the inlet-side header 31, the fluid is conveyed by the compression device 2. In this case, the pressure and / or the temperature of the fluid increase and the volume can be reduced.
  • the compression device 2 conveys the fluid into the outlet-side header 32. There, the compressed fluid can be supplied via a second connecting piece 322 for subsequent use and, for example, for driving a machine tool, a heat pump, an air conditioner or a refrigerating machine use.
  • the compression device 2 has at least one inlet 21 and at least one outlet 22.
  • the inlet 21 removes the fluid from the inlet-side header 31.
  • the outlet 22 is connected to the outlet-side header 32 via an opening 352 in the partition wall 35. It is on it It should be pointed out that the pipe sockets illustrated diagrammatically as inlet 21 and outlet 22 are merely exemplary. In other embodiments of the invention, the pipelines may be shorter or longer. In some embodiments of the invention, pipelines can also be dispensed with altogether, for example if the dividing wall 35 is simultaneously part of the housing of the compression device 2.
  • the compression device 2 itself may include a scroll compressor, a Wälzkolbenverêtr, a reciprocating compressor, a rotary valve compressor or a rotary compressor or any other known per se compression device.
  • the invention does not teach the use of a specific compression device 2 as a solution principle. Therefore, the compression device 2 is in FIG. 1 also shown only schematically. Details of the construction are familiar to the expert.
  • drive means 25 are available. In some embodiments of the invention, this may be an electric motor. This can be controlled with not shown terminal contacts, switches and motor protection devices in a conventional manner.
  • the compression device may also be operated with a plurality of drive means 25.
  • the housing 3 there may also be a plurality of compression devices 2 which either serially convey the fluid to achieve a higher end pressure, or which convey the fluid in parallel to increase the flow.
  • a plurality of compression devices 2 can be operated with a single electric drive means 25 or again there are a plurality of drive means 25 for Available to drive the plurality of compression devices 2.
  • the compression device 2 is usually provided with an oil supply.
  • the oil serves on the one hand to lubricate the moving parts of the compression device and thus to reduce wear and friction.
  • the compression device 2 may also be oil sealed, i. Production-related gaps in the compression space are sealed by the oil film forming in this gap in order to enable or at least optimize the operation of the compression device.
  • the oil required to operate the compression device 2 is collected in an oil sump 36 at the bottom of the housing 3. From there, the oil is removed via an oil pump, not shown, and fed to the compression device 2. Excess oil can be discharged from the compression device 2 via corresponding flushing openings and subsequently collected again in the sump 36.
  • the invention proposes to arrange a filter element 4 in the outlet-side collector 32.
  • the filter element 4 may contain or consist of a coalescence separator and / or a mass force separator. Embodiments of a Koaleszenzabscheiders are described below with reference to FIGS. 3 and 4 explained in more detail.
  • the filter element 4 is set up and determines, during operation of the compressor 1, the oil driven by gravity and / or by Kapillar institute the collection point 325 supply. Once there has accumulated a predetermined amount of oil, this is supplied via a valve 6 to a return line 5, which returns the oil from the collection point 325 in the oil sump 36. In this way, the fluid leaving the second port 322 contains no or less of the oil, thereby reducing or eliminating the contamination of subsequent components. In the case of a heat pump, an air conditioner or a refrigerating machine can thereby increase the power and / or efficiency.
  • FIG. 2 shows a section through a compressor according to the invention.
  • Identical components of the invention are provided with the same reference numerals, so that the following description is limited to the essential differences.
  • the filter element 4 does not surround the opening 352 and thus the inlet side of the outlet-side header, but the filter element 4 is arranged in front of the second connection piece 322. With the fluid promoted oil can thus be reflected on surfaces of the collector and from there gravitationally driven into the collection point 325. Thereafter remaining oil is removed by the filter element 4 immediately before leaving the fluid flow through the second connection piece 322 and from there also the collection point 325 is supplied.
  • the filter element 4 may be a Koaleszenzabscheider and / or a Massenkraftabscheider.
  • Massenkraftabscheiders may be a baffle plate, which deflects the flow so that the oil mist adheres to the baffle plate due to its inertia and there gravity-driven runs into the collection point 25.
  • a coalescence separator may be used as described above FIG. 1 be described described.
  • the collection point 25 can also represent the lowest point of the outlet-side collector 32 in this case, so that the oil is collected without further measures, such as pumps, there and fed via the valve 6 and the return line 5 in the sump 36.
  • Both embodiments have in common that the valve 6 remains closed until a sufficient amount of oil has accumulated in the collection point 325. This prevents the fluid from undesirably flowing back from the outlet-side header 32, which is under comparatively high pressure, into the inlet-side header 31, which is under comparatively low pressure. Such reflux would return some of the fluid compressed and delivered by the compression device 2, so that it would have to be re-pumped. This reduces the efficiency of the compressor.
  • the invention avoids this disadvantage by the valve 6, which closes the return line 5 until a sufficient amount of oil was collected in the collection point 325. Then, the valve 6 opens briefly to transfer the oil through the return line 5 into the sump 36. This is done on the one hand gravitationally driven.
  • the pressure difference between the outlet-side and inlet-side collector also helps to convey the oil through the return line. Falls below a predetermined oil level in the collection point 325, the valve 6 closes.
  • the valve 6 may be, for example, a solenoid valve or a shape memory valve. These can be controlled via an electronic control and an optional associated sensor system, which monitors the oil level in the collection point 325. The valve can thus be controlled in time and / or depending on the measured oil level in the collection point 325.
  • the valve 6 may be a float valve. Such a float valve will be described below with reference to FIG. 5 explained in more detail.
  • FIG. 3 shows a section through a Koaleszenzabscheider 4, which, for example, as in FIG. 1 shown disposed above the opening 352 in the outlet side collector 32.
  • the coalescence separator contains a first layer 41 and at least one second layer 42.
  • FIG. 3 also an optional third layer 43, which may also be omitted in other embodiments.
  • the first layer 41 represents the actual filter layer, which serves the oil separation. This may for example consist of a plurality of fibers, which are joined together, for example, as a nonwoven, knitted fabric or knitted fabric, so that form pores between adjacent fibers. In other embodiments of the invention, the first layer 41 may comprise a porous shaped body, for example an open-celled foam. In still other embodiments of the invention, the second layer 42 may comprise a metal or an alloy, for example in the form of an expanded metal grid or a stack of expanded metal grids or perforated plates.
  • the first layer 41 may also contain a plurality of different layers, for example a nonwoven layer which is surrounded on one or both sides by a knitted or knitted fabric or a porous molded article which is embedded in a nonwoven.
  • a nonwoven layer which is surrounded on one or both sides by a knitted or knitted fabric or a porous molded article which is embedded in a nonwoven.
  • Fibers or shaped bodies may consist of a metal or an alloy, glass or plastic. Fibers, perforated sheets or expanded metal mesh can be provided with an oleophobic or oleophilic coating.
  • the first layer 41 represents the actual filter element. This means that as the fluid passes through the first layer 41, the fluid almost unaltered the layer 41 penetrates, but contained oil mist is at least partially bonded to the inner surfaces of the porous body of the first layer 41. The thus bound oil film can grow in the pores of the first layer 41 to larger droplets, which then gravity driven in either the first layer or via the adjacent second and / or third layers 42 and 43 run out of the Koaleszenzabscheider 4.
  • the second layer 42 and the optional third layer 43 may serve as described above to transport the oil to the collection point 325.
  • the second layer 42 and / or the third layer 43 may have a similar structure as the first layer 41, wherein the pore size or the pore size distribution may be greater than the average pore size or pore size distribution of the first layer 41. In this way the functions separation and transport are spatially separated.
  • the second layer 42 and the optional third layer 43 may also serve only for the mechanical stabilization of the first layer 41.
  • the second and / or third layer may contain a perforated material layer, for example a metal or an alloy in the form of a sheet or a plastic, which are each provided with holes 425 and 435.
  • the pores 425 in the second layer 42 and the pores 435 in the third layer 43 may be arranged offset relative to one another such that they are not arranged one above the other in the flow direction of the fluid. This prolongs the mean distance traveled by the fluid in the first layer 41, so that the deposition can be improved.
  • the bores may also be arranged one above the other in order to reduce the flow resistance.
  • FIG. 4 a second embodiment of a Koaleszenzabscheiders is explained in detail.
  • Like components of the invention are given the same reference numerals, so that the following description is limited to the essential differences of the invention.
  • the main difference is the execution of the holes 435 in the third layer 43.
  • These are designed such that a projection 431 is punched out of the third layer 43, so that on the one hand results in a gap as an opening 435 and on the other hand, a remainder of the punched-out material layer as a supernatant 431 is above the opening.
  • This avoids that components of the first layer 41 are discharged through the flow of the fluid from the opening 435.
  • large oil droplets detaching from the wall of the second collector penetrate into the first layer 41. Instead, they can run over the projection 431 on the outside of the third layer 43.
  • valve 6 is seated in a housing 62, which has approximately a cylindrical basic shape and protrudes from the bottom of the collection point 325 through the partition 35 into the first collector 31. At the end of the housing 62 there is a cone 625, which can be sealed with a likewise cone-shaped, complementarily shaped sealing element 615.
  • the sealing member 615 is fixed to a float 61.
  • the sealing element 615 and the float 61 may be made in one piece, for example of a plastic material.
  • a guide rod 63 On the upper wall of the housing 3 is a guide rod 63, which is also approximately perpendicular to the partition wall 35 and projects parallel to the axis of symmetry of the housing 62 in this.
  • the guide rod 63 with its first end 631 on the wall attached to the housing 3, for example by soldering or welding.
  • the second, opposite end 632 projects freely into the housing 62.
  • the float 61 is provided with a central bore, in which the guide rod 63 engages, so that the float along the guide rod 63 can be moved up and down.
  • oil now collects in the collection point 325, then it runs at the lowest point of the collection point 325 into the interior of the housing 62. There, the exit is initially closed by the sealing element 615 which rests in the cone 625. With increasing oil level, the float 61 is getting more and more lift until it slides up along the guide rod 63 and releases the sealing element 615. In this case, the oil may drain through the lower opening 64 of the housing 62. After the oil level has dropped sufficiently low, the float 61 lowers, so that the sealing element 615 can close the opening 64 again.
  • the float 61 On the float 61 on the one hand, its weight acts, which moves the float 61 down and thus the sealing element 615 in the closed position. The buoyant force of the oil collecting in the housing 62 and the collecting point 325 counteracts this. However, during operation of the device, the float additionally has a further force resulting from the pressure difference which also holds the sealing element 615 in the closed position. This force results from the pressure difference between the inlet-side header 31 and the outlet-side header 32. Since the pressure caused by the compression device prevails in the outlet-side header 32, the float 61 is additionally subjected to this pressure or via the opening 64 into the cone 625 sucked.
  • an optional spring 65 may be disposed below the float 61, which pushes the sealing element 615 out of the cone 625 and at least partially compensates for the force caused by the pressure difference.
  • the float 61 can be made smaller, since the oil now only has to apply the force to overcome the friction of the guide rod 63 and the dead weight.
  • the force caused by the pressure difference on the float 61 is at least partially or predominantly compensated by the spring.
  • the spring 65 may be designed so that it raises the float 61 when the compression device 2 is switched off and after the pressure difference has been reduced, so that the oil in each case flows into the sump 36, independently of the respective fill level in the collection point 325, if the present invention Compressor is taken out of service.
  • the spring 65 is located below the sealing element 615. This is only to be understood as an example. Of course, the spring can also engage at other points of the float 61, for example as a tension spring along the guide rod 63 or as a compression spring in the housing 62, wherein the spring at the junction of the housing 62 to the cone 625 can attack.
  • FIGS. 6 and 7 Based on FIGS. 6 and 7 a second embodiment of a valve 6 is explained in more detail. It shows Fig. 6 the valve in the closed position and Fig. 7 shows the valve in the open position. Identical components of the invention are provided with the same reference numerals, so that the following description is limited to the essential differences.
  • the second embodiment of the invention uses a spring 65, which is adapted to move the float 61 with the sealing element 615 disposed thereon in the open position.
  • the spring 65 comprises a shape memory alloy or consists of such an alloy.
  • Such a shape memory alloy is a special metal which may be present in two different crystal structures. The shape transformation of the spring is thus based on the temperature-dependent change of the crystal structure.
  • the spring 65 at high temperature in Fig. 6 shown, comparatively small longitudinal extent. At lower temperature, the spring takes in the Fig. 7 shown shape with greater longitudinal extent.
  • the housing 3 cools down with all the components contained therein. This results in that the spring 65, the in Fig. 7 shown position occupies. As a result, the sealing element 615 is pushed out of the cone 625 and the opening 64 is released. Thus running in the collection point 325 located oil when decommissioning of the compressor 1 reliably in the sump 36 from.
  • the fluid is compressed by the compression device 2 and thereby heated.
  • the heated fluid initially flows back through the collection point 325, the cone 625 and the opening 64 into the inlet-side header 31 in part.
  • the flow of the heated fluid to the spring 65 leads to heating of the spring 65.
  • the float 61 is lowered and the sealing element 615 is guided into the cone 625. This closes the opening 64 so that the flow of the heated fluid to the spring 65 stops.
  • the compressor 1 is now in Normal operation, in which the fluid from the inlet-side header 31 is conveyed into the outlet-side header 32 and leaves it through the second connection piece 322.
  • the oil located in the collection point 325 can flow via the opening 64 and an optional return line into the sump 36. Following this, the valve 6 closes again, as described above during initial startup.
  • valve 6 according to the invention in turn has an opening 64 which can be closed by a sealing element 615.
  • the sealing element 615 is located at the end of a push rod 73.
  • the push rod 73 is moved up and down by electric drive means 7, so that the sealing element 615 can be moved from the open to the closed position and from the closed to the open position.
  • the electric drive means 7 may, for example, contain a magnetic coil which generates a magnetic field when the current flows, which magnetic field is a ferromagnetic push rod 73 attracts and thus the valve 6 opens.
  • the electric drive means 7 may include a motor, such as a stepper motor or a linear motor. Such a motor can, for example, move the push rod 73 via a spindle drive and thus open the sealing element 615.
  • an electronic control or regulation is present. This is supplied to an actual value of the oil level in the collection point 625, which is detected by a sensor. If it is detected that the actual value exceeds a predefinable desired value, it is possible to output to the drive means 7 to a corresponding control signal.
  • the senor includes a lower limit switch 731 and an upper limit switch 732.
  • the limit switches 731 and 732 are actuated by a float 61, which has a through hole through which the push rod 73 is guided, so that the float 61 along the push rod 73rd slides up and down.
  • the control or regulating device can be reported that no or only a small amount of oil is in the collection point 325. With increasing oil level in the collection point 325, the float 61 floats on the oil until it reaches the upper limit switch 732. If this limit switch is actuated, the control or regulating device gives the electric drive means 7 the signal for opening the sealing element 615 in the cone 625.
  • the control or regulating device With the drainage of the oil from the collection point 325, the float 61 drops again, until it reaches the lower limit switch 731 actuated. From this, the control or regulating device generates a signal for closing the electric drive means 7, so that the opening 64 is closed again and an undesired overflow of the compressed fluid from the outlet-side header 32 into the inlet-side header 31 is avoided.
  • control or regulating device can take on additional functions, for example, a safety shutdown of the compressor 1 take place when after a predetermined opening time of the valve 6, the float 61 does not reach the limit switch 731.
  • a float 61 may also be dispensed with in some embodiments of the invention.
  • FIG. 9 explains the operation of a fourth embodiment of a valve. Identical components of the invention are provided with the same reference numerals, so that the following description is limited to the essential differences.
  • the fourth embodiment is similar to the second embodiment described with reference to FIGS FIGS. 6 and 7 was explained.
  • the fourth embodiment uses a longer return line 5 than the second embodiment, which returns the oil deeply into the inlet-side header 31.
  • the spring 65 which may contain or may consist of a shape memory alloy, is arranged at the end of the return line 5 and thus likewise in the inlet-side collector 31.
  • the spring can produce a higher spring force when it is relatively cold and produces a lower spring force when relatively warm. Since the spring 65 is exposed in the fourth embodiment on average lower temperatures, the spring force is higher on average.
  • the spring 65 acts via a push rod 66 on the sealing element 615, wherein the push rod 66 is guided within the return line 5.
  • the fourth embodiment avoids the problem that the valve 64 is directly closed by the sealing member 615 when the spring 65 comes into contact with the hot, draining oil and thereby decreases the spring force. As a result, a complete emptying of the collection point can be ensured.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Compressor (AREA)
EP19178725.8A 2018-06-06 2019-06-06 Compresseur, pompe à chaleur ou installation de climatisation ou machine de réfrigération et procédé de compression Active EP3578817B1 (fr)

Applications Claiming Priority (1)

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DE102018208970.1A DE102018208970A1 (de) 2018-06-06 2018-06-06 Verdichter, Warmepumpe oder Klimaanlage oder Kaltemaschine und Verfahren zum Verdichten

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EP3578817A1 true EP3578817A1 (fr) 2019-12-11
EP3578817B1 EP3578817B1 (fr) 2021-01-06

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EP19178725.8A Active EP3578817B1 (fr) 2018-06-06 2019-06-06 Compresseur, pompe à chaleur ou installation de climatisation ou machine de réfrigération et procédé de compression

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DE (1) DE102018208970A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102022118525A1 (de) 2022-07-25 2024-01-25 Wolf Gmbh Abscheideeinrichtung, insbesondere Luft- und/oder Kältemittelabscheideeinrichtung für eine Wärmepumpenanlage

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0066221A1 (fr) * 1981-06-02 1982-12-08 Siemens Aktiengesellschaft Dispositif à compresseur
JPS616699U (ja) * 1984-06-19 1986-01-16 株式会社神戸製鋼所 油冷式容積形圧縮機
EP1043501A2 (fr) * 1999-04-10 2000-10-11 Druckluft Dannöhl GmbH Filtre à huile pour un compresseur à piston à plusieurs étages
WO2002042645A1 (fr) * 2000-11-23 2002-05-30 Luk Fahrzeug-Hydraulik Gmbh & Co. Kg Installation de climatisation comprenant un separateur de lubrifiant et un compresseur
DE10142540A1 (de) * 2001-08-30 2003-03-20 Volkswagen Ag Taumelscheibenkompressor
US7082785B2 (en) 2004-07-13 2006-08-01 Carrier Corporation Oil separator for vapor compression system compressor
EP3136020A1 (fr) * 2015-08-27 2017-03-01 Mitsubishi Heavy Industries, Ltd. Système de réfrigération par compression à deux étages

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1450122A (en) * 1921-09-30 1923-03-27 Universe Corp Compressor
US6017205A (en) * 1996-08-02 2000-01-25 Copeland Corporation Scroll compressor
JP2001289164A (ja) * 2000-04-07 2001-10-19 Toyota Autom Loom Works Ltd 可変容量圧縮機及びそれへの潤滑油供給方法
US7566210B2 (en) * 2005-10-20 2009-07-28 Emerson Climate Technologies, Inc. Horizontal scroll compressor

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0066221A1 (fr) * 1981-06-02 1982-12-08 Siemens Aktiengesellschaft Dispositif à compresseur
JPS616699U (ja) * 1984-06-19 1986-01-16 株式会社神戸製鋼所 油冷式容積形圧縮機
EP1043501A2 (fr) * 1999-04-10 2000-10-11 Druckluft Dannöhl GmbH Filtre à huile pour un compresseur à piston à plusieurs étages
WO2002042645A1 (fr) * 2000-11-23 2002-05-30 Luk Fahrzeug-Hydraulik Gmbh & Co. Kg Installation de climatisation comprenant un separateur de lubrifiant et un compresseur
DE10142540A1 (de) * 2001-08-30 2003-03-20 Volkswagen Ag Taumelscheibenkompressor
US7082785B2 (en) 2004-07-13 2006-08-01 Carrier Corporation Oil separator for vapor compression system compressor
EP3136020A1 (fr) * 2015-08-27 2017-03-01 Mitsubishi Heavy Industries, Ltd. Système de réfrigération par compression à deux étages

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EP3578817B1 (fr) 2021-01-06

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