EP4226044A1 - Filter-and-throttle unit for a scroll compressor, and scroll compressor for a refrigerant circuit - Google Patents

Filter-and-throttle unit for a scroll compressor, and scroll compressor for a refrigerant circuit

Info

Publication number
EP4226044A1
EP4226044A1 EP20789083.1A EP20789083A EP4226044A1 EP 4226044 A1 EP4226044 A1 EP 4226044A1 EP 20789083 A EP20789083 A EP 20789083A EP 4226044 A1 EP4226044 A1 EP 4226044A1
Authority
EP
European Patent Office
Prior art keywords
filter
scroll compressor
pressure chamber
housing
throttle unit
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.)
Pending
Application number
EP20789083.1A
Other languages
German (de)
French (fr)
Inventor
Lukas LÖHMER
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.)
Pierburg GmbH
Original Assignee
Pierburg GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Pierburg GmbH filed Critical Pierburg GmbH
Publication of EP4226044A1 publication Critical patent/EP4226044A1/en
Pending legal-status Critical Current

Links

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
    • F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
    • F04C29/0092—Removing solid or liquid contaminants from the gas under pumping, e.g. by filtering or deposition; Purging; Scrubbing; Cleaning
    • 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
    • F04C18/02—Rotary-piston pumps specially adapted for elastic fluids of arcuate-engagement type, i.e. with circular translatory movement of co-operating members, each member having the same number of teeth or tooth-equivalents
    • F04C18/0207—Rotary-piston pumps specially adapted for elastic fluids of arcuate-engagement type, i.e. with circular translatory movement of co-operating members, each member having the same number of teeth or tooth-equivalents both members having co-operating elements in spiral form
    • F04C18/0215—Rotary-piston pumps specially adapted for elastic fluids of arcuate-engagement type, i.e. with circular translatory movement of co-operating members, each member having the same number of teeth or tooth-equivalents both members having co-operating elements in spiral form where only one member is moving
    • 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
    • F04C27/00—Sealing arrangements in rotary-piston pumps specially adapted for elastic fluids
    • F04C27/008—Sealing arrangements in rotary-piston pumps specially adapted for elastic fluids for other than working fluid, i.e. the sealing arrangements are not between working chambers of the machine
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
    • F04C29/02—Lubrication; Lubricant separation
    • F04C29/026—Lubricant separation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2210/00—Fluid
    • 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

Definitions

  • the invention relates to a filter and throttle unit for a Sero II compressor with a housing with housing walls and an opening that serves as a throttle or orifice, which is formed in one of the housing walls, and a scroll compressor for a refrigerant circuit with a drive, a Drive-driven eccentric unit, via which an orbiting displacement spiral can be moved, which engages in a fixed stator spiral, at least one displacement space between the stator spiral and the displacement spiral, a high-pressure chamber into which the at least one displacement space opens, a low-pressure chamber that opens into the at least one displacement space , an oil return channel via which the high-pressure chamber is fluidly connected to the low-pressure chamber, a back-pressure chamber which is formed on the side facing away from the stator spiral of the displacer spiral, and a gas connection channel via which the back-pressure chamber with the Hochdruckka is always fluidly connected.
  • Such scroll compressors are used in particular for compressing refrigerants in refrigeration and air conditioning circuits in motor vehicles.
  • the expanded refrigerant entering the scroll compressor is in the gaseous state and usually flows into the housing on the motor side, at least in the case of scroll compressors driven by an electric motor, so that the refrigerant flows through the electric motor.
  • the refrigerant also absorbs the oil in the engine compartment that is required for lubrication, which is usually separated from the refrigerant in an oil separator on the scroll compressor and is fed into the scroll compressor for lubrication is returned.
  • the compressed refrigerant returns to the refrigerant circuit via an outlet.
  • Such scroll compressors are known, for example, from EP 3 404 264 A1 and comprise a high-pressure chamber, a low-pressure chamber, an orbiting displacement coil and a fixed stator coil that interacts with the displacement coil.
  • the orbiting displacement spiral engages in the stator spiral in such a way that displacement spaces are formed between the displacement spiral and the stator spiral, in which the medium to be compressed is received and compressed.
  • a back pressure chamber is provided between the bearing housing of the compressor and the displacer scroll. The pressure prevailing in the counter-pressure chamber and acting on the displacement scroll causes a resultant force in the axial direction, as a result of which the displacement scroll is pressed against the fixed scroll and the scrolls are thus sealed off from one another.
  • the scroll compressor includes an oil return channel which fluidly connects the high-pressure chamber to the low-pressure chamber.
  • an oil provided for lubricating the components in the scroll compressor is separated from the compressed fluid via a separator arranged in the high-pressure chamber and returned to the low-pressure chamber via the oil return channel, so that the returned oil can be used again to lubricate the components.
  • An oil return throttle is arranged in the oil return channel to reduce the pressure of the returned oil.
  • a scroll compressor is known from US 2005/0129556 A1, in which a filter element is also arranged in the oil return line in addition to the throttle, in order to filter contaminants from the oil.
  • a disadvantage of the known scroll compressors is that either the recirculated gas and oil are not filtered at all, or the effort involved in manufacturing and assembling the filter element and the throttle is very high. In addition, there is a risk of the filter elements in the return channels becoming clogged.
  • the object is therefore to provide a filter and throttle unit that can be manufactured easily and installed in a scroll compressor with little effort. Furthermore, clogging of the filter elements in the scroll compressor should be prevented.
  • the filter and throttle unit according to the invention for a scroll compressor has a housing with housing walls that form an outer wall of the filter and throttle unit and thus delimit the unit axially and radially.
  • An opening serving as a throttle or screen is formed in one of these limiting walls.
  • a filter element is arranged within the housing walls, and thus likewise delimited at least radially by the housing walls. Accordingly, a unit consisting of a throttle or screen and a filter element is created, which can simply be inserted as a whole into a corresponding receptacle on the scroll compressor can be used, making assembly much easier.
  • the production is simplified, since the housing wall serves as a throttle or diaphragm directly through the formation of the opening, without additional components having to be installed for this purpose.
  • the scroll compressor according to the invention has a drive which can be formed in particular by an electric motor.
  • This drives an eccentric unit, which is coupled in motion to a displacement spiral, so that it performs an orbiting, i.e. eccentric, rotational movement.
  • the displacement spiral is usually arranged on a sliding disc and engages in a fixed stator spiral, which delimits one or more displacement spaces with the displacement spiral, which are reduced when the displacement spiral rotates along the stator spiral, so that the medium is compressed in the surrounding displacement spaces.
  • the last displacement chamber opens into a high-pressure chamber into which the compressed medium flows, for example via an outlet valve.
  • the scroll compressor also has a low-pressure chamber, which opens into the outer displacement space and serves as an inlet, with the entire space in which the electric motor can be arranged also forming the low-pressure chamber.
  • a low-pressure chamber which opens into the outer displacement space and serves as an inlet, with the entire space in which the electric motor can be arranged also forming the low-pressure chamber.
  • This is correspondingly formed by the entire enclosed space of the scroll compressor, in which the fluid to be compressed is present in a relaxed state, in which it also flows into the scroll compressor.
  • an oil return channel is formed, via which the high-pressure chamber is fluidically connected to the low-pressure chamber, the fluidic connection usually not taking place directly but via an oil separation chamber.
  • the scroll compressor has a back pressure chamber which is formed on the side of the displacer scroll which is remote from the stator scroll, with a gas connection channel fluidically connecting the back pressure chamber to the high pressure chamber in order to generate a back pressure by which the displacer scroll is loaded against the stator scroll.
  • a filter and throttle unit is arranged in the oil return duct, which has a housing with housing walls which limit the filter and throttle unit to the outside. In one of these limiting walls of the filter and choke unit, an opening serving as a choke or diaphragm is formed.
  • a filter element is arranged within a space delimited by the housing walls.
  • This design of a filter and throttle unit enables the unit consisting of filter and throttle or screen to be easily inserted into a corresponding receiving opening in the scroll compressor in one assembly step. It can be attached by simply pressing it in.
  • the unit consisting of the choke or screen and filter remains easily accessible and replaceable.
  • the housing has an axially delimiting housing wall in which the opening serving as a throttle or diaphragm is formed, and an annular, radially delimiting housing wall which extends axially from the axially delimiting housing wall. Accordingly, an essentially pot-shaped component is created, the housing of which does not have to be assembled further, but can be produced in one piece.
  • the filter element is preferably designed in the form of a plate and delimits the filter and throttle unit on one axial side. This means that the filter element can be easily reached and installed in the housing.
  • the plate-shaped configuration creates a surface through the filter element, particularly in the case of compressors arranged horizontally, which surface can be arranged perpendicularly to the gravitational force, so that the filter element is self-cleaning without external forces. The filtered solids do not settle on the filter element even during operation.
  • the filter element is designed as a filter screen, which is limited radially by a sealing element, which in the housing is attached.
  • the sealing element ensures that no oil or gas can flow past the filter element.
  • the sieve has a sufficient filter effect with high durability.
  • the filter screen can be easily fixed in the housing via the sealing element.
  • the housing is preferably designed as a stamped part, in which the filter element is fastened in a form-fitting manner with the sealing element.
  • the design as a stamped part is also particularly cost-effective, as is the form-fitting attachment of the filter element to the sealing element. This attachment can be done, for example, by simply reshaping the axial end of the annular housing wall.
  • the sealing element rests with a first axial side against the axially delimiting housing wall and with its opposite axial side against a collar of the radially delimiting housing wall that extends at least partially radially inwards.
  • a tight connection is achieved when the sealing element is axially pressed between the collar and the axially delimiting housing wall, which ensures that the gas or oil can only flow through the filter element, which is surrounded by the seal.
  • the filter screen is encapsulated radially on the outside with a plastic of the sealing element, so that the filter screen can be inserted into the housing with the sealing element as one part and fastened there, which additionally facilitates assembly and manufacture.
  • the filter screen could be inserted between two pressed sealing elements within the housing or secured between the collar and a sealing element.
  • the gas connection channel and/or the oil return channel extends at least in sections through the stator spiral. These channels can easily be incorporated during manufacture of the spiral, so that no additional processing is necessary.
  • the filter and throttle unit is fastened in the stator spiral.
  • the filter and throttle unit can simply be pushed into the corresponding channels in the housing of the compressor before the stator spiral is installed.
  • the filter and throttle unit is pressed into an inlet opening on a cover plate of the stator spiral, the filter element being plate-shaped and delimiting the high-pressure chamber.
  • the filter element extends at the same level as the wall surface of the cover disk of the stator spiral that delimits the high-pressure chamber, so that a common wall surface is formed. This means that there is no space in which the filtered out contaminants can settle in front of the filter element. Instead, with the usual horizontal design of the compressor, these will always fall from the surface of the filter element back into the high-pressure chamber due to the gravitational force, which prevents the filter element from becoming clogged.
  • the gas connection channel preferably extends from the high-pressure chamber through the stator spiral and a bearing housing part to the counter-pressure chamber. So few components have to be precisely aligned with each other during assembly, in which the channel can be easily produced.
  • the high-pressure chamber is preferably connected to an oil separation chamber in which an oil separator is arranged. This enables the oil to be separated and returned to the low-pressure chamber, so that the oil load on downstream components can be kept low.
  • the oil return channel preferably extends, starting from a lowest point of the oil separation chamber, through a head housing part, the stator spiral and the bearing housing part to the low-pressure chamber.
  • the inlet opening of the gas connection channel is preferably arranged in front of the oil separator in the flow direction of the gas, so that a gas-oil mixture reaches the counter-pressure chamber and thus the bearing housing, which ensures that the bearings and moving parts present there are sufficiently lubricated.
  • a filter and throttle unit and a scroll compressor for a refrigerant circuit of a motor vehicle with such a filter and throttle unit are thus created, which can be easily manufactured and installed. This reduces costs both in the production of the filter and throttle unit and in their assembly on the compressor. Furthermore, the filter element is self-cleaning, which also prevents the return lines from becoming clogged.
  • FIG. 1 shows a perspective view of a throttle and filter unit according to the invention.
  • FIG. 2 shows a side view of the filter and throttle unit according to the invention from FIG. 1 in a sectional representation.
  • FIG. 3 shows a side view of a scroll compressor according to the invention for a refrigerant circuit of a motor vehicle with a filter and throttle unit shown in FIGS. 1 and 2 in a sectional view.
  • the filter and throttle unit 10 shown in Figures 1 and 2 has a housing 12, which consists of an axially delimiting housing wall 14, which is somewhat thinner in the radially inner area in the present exemplary embodiment, and an annular filter and throttle unit 10 radially delimiting housing wall 16 which extends axially from the radially outer edge of the axially delimiting housing wall 14 .
  • This housing can be made particularly easily from sheet metal by stamping and bending.
  • a narrow opening 18 serving as a throttle or screen is formed.
  • annular sealing element 20 is clamped and axially pressed between the axially delimiting housing wall 14 and an axial end section of the annular radially delimiting housing wall 16 designed as a collar 22, which is bent radially inwards.
  • the first axial side of the sealing element 20 rests against the axially limiting wall 14 and the opposite axial side of the sealing element 20 against the collar 22 .
  • a filter element 24 designed as a filter screen is arranged on the open side of the housing 12, which is designed as a plate and whose radially outer edge is either encapsulated by the plastic of the sealing element 20 or is clamped axially between two sealing elements 20 or between the collar 22 and the sealing element 20 .
  • oil or refrigerant can flow into the housing 12 via the filter element 24, so that solids are filtered out of the oil or refrigerant flow, and can flow out of the filter and throttle unit 10 again via the opening serving as a throttle or orifice, with the pressure behind of the opening 18 is smaller than the pressure in front of the opening 18.
  • the mass flow is also significantly reduced by the narrowing of the cross section.
  • the figure shows a scroll compressor 26 according to the invention, which has a multi-part compressor housing 28 with a first motor housing part 30 and a head housing part 32 adjoining it axially, with the motor housing part 30 enclosing a drive 34 in the form of an electric motor and the head housing part 32 enclosing a compressor chamber 36 .
  • the drive 34 has a stator 38 with windings 40 and an internal rotor 42 with permanent magnets 44 which is fastened on a shaft 46 .
  • the shaft 46 and thus the rotor 26 are mounted on the one hand via a ball bearing 48 which is arranged in a receiving opening on an axially delimiting rear wall 50 of the motor housing part 30 and on the other hand via a second ball bearing 52 which is arranged in a receptacle of a bearing housing part 54. which is fastened on the side axially opposite to the rear wall 50 in the radially inside of the motor housing part 30 .
  • a shaft sealing ring 56 is arranged in the bearing housing part 54, via which a motor compartment 58, in which the drive 34 is arranged, is sealed against a counter-pressure chamber 60, which is at the is formed on the axial side of the bearing housing part 54 opposite to the engine compartment 58 .
  • an electronics space 62 in which a circuit board 64 with the power electronics 66 is fastened. This is connected to the windings 40 of the stator 38 so that it can be supplied with current in a controlled manner.
  • the power electronics 66 are supplied with power via a plug 68 which extends parallel to the axis of the motor from the rear wall 50 .
  • the electronics space 62 is closed by a cover 70 .
  • An eccentric unit 72 is formed on the end of shaft 46 pointing towards compressor chamber 36, on whose output journal 74 an eccentric shaft bearing 76 is arranged, on which an orbiting displacement spiral 78 is eccentrically mounted, which corresponds to a stator spiral 80, which is located in head housing part 32 and on the bearing housing part 54 is fixed, so that when the displacement spiral 78 rotates eccentrically, its walls 82 slide along the walls 84 of the stator spiral 80 to form a plurality of displacement chambers 86, as a result of which the displacement chambers 86 are reduced in their expansion and the refrigerant sucked in from a low-pressure chamber 88 is compressed .
  • the inlet from the low-pressure chamber 88 into the displacement chambers 86 is formed radially between the head housing part 32 and the fixed stator spiral 80, so that the refrigerant flows radially inward from the low-pressure chamber 88 through the displacement chambers 86 in the direction of an outlet 90, which is on a cover plate 91 of the Stator spiral 80 is formed, is conveyed into a high-pressure chamber 92 via a check valve 94 designed as a leaf spring element.
  • the low-pressure chamber 88 is supplied with the refrigerant via a compressor inlet (not visible), through which the refrigerant flows into the engine compartment 58 , which serves as the low-pressure chamber 88 .
  • a sliding disk 96 is arranged between the bearing housing part 54 and the stator spiral 80 and the orbiting displacement spiral 78 , which is clamped in the radially outer area between the head housing part 32 and the motor housing part 30 .
  • This sliding disc 96 also has openings through which several pins (not visible in the figure) protrude from the bearing housing part 54 into corresponding receptacles 98 of the orbiting displacement scroll 78, on which sliding bushings 100 are arranged, via which the displacement scroll 78 is additionally slidably mounted.
  • the displacement spiral 78 has a sliding and sealing ring 104 arranged in a circumferential groove 102 on the side facing the sliding disk 96 .
  • the displacer spiral 78 is arranged in a slidingly guided manner relative to the shaft 46 and to the bearing housing part 54 .
  • the high-pressure chamber 92 of the scroll compressor 26 is fluidly connected to an oil separation chamber 106 in which an oil separator 108 in the form of a cyclone is arranged so that the lighter, gaseous refrigerant flows to a compressor outlet 110, while the liquid and heavier oil is separated from the refrigerant in the cyclone is and to a lowest point of the oil separation chamber 106, which is formed by a floor 112 drips.
  • oil return channel 114 is provided on bottom 112 of oil separation chamber 106, which fluidly connects oil separation chamber 106 and thus high-pressure chamber 92 to low-pressure chamber 88 or engine compartment 58.
  • the oil return passage 114 extends through the head housing part 32, the fixed stator spiral 80, the sliding washer 96 and through the bearing housing part 54 into the engine compartment 58.
  • the filter and throttle unit 10 is in an inlet opening 116 of the oil return channel 114 on the cover disk 91 of the stator spiral 80 fitted, in particular pressed in, so that the oil is returned to the engine compartment 58 with reduced pressure and filtered.
  • a gas connection channel 118 extends from the high-pressure chamber 92 through the stator volute 80, the sliding disk 96 and through the bearing housing part 54 into the counter-pressure chamber 60, in which the pressure is reduced compared to the high-pressure chamber 92 but increased to the low-pressure chamber 88, whereby the orbiting displacement volute 78 is loaded against the stator volute 80, resulting in an improved seal between the faces of the orbiting displacer volute 78 and the fixed stator volute 80.
  • a filter and throttle unit 10 at an inlet opening 120 in the gas connection channel 118 on the cover disk 91 of the stator spiral 80, the opening 18 of which is designed to be correspondingly large and which can be pressed into the inlet opening 120.
  • the filter element 24 prevents dirt from entering the counter-pressure chamber 60, whereby the ball bearings 52, eccentric shaft bearings 76, sliding bushes 100 and the sliding disk 96 and the sliding and sealing ring 104 arranged there are protected.
  • the filter surface of the filter element 24 is thus located at the inlet opening 120 of the gas connection channel 118 as well as at the inlet opening 116 of the oil return channel 114 approximately in one plane with the cover disk 91 of the stator housing part 80. This means that contaminants filtered out there do not settle in the oil return channel 116 or in the gas connection channel 120 and clogs it, but falls into the high-pressure chamber 92 due to the force of gravity. Self-cleaning thus takes place. Accordingly, the functionality of the oil return channel 116 and the gas connection channel 120 is maintained over a long period of time. Furthermore, the filter and throttle units 10 can be expanded and replaced in a simple manner, since they are easily accessible and easy to assemble and disassemble. Different desired back pressures can also be set by filter and throttle units 10 with different opening widths.
  • the scroll compressor can have any drive or the housing divisions can be changed.
  • the filter and throttle assembly can be secured in the intake ports in a manner other than press fitting.

Landscapes

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

Abstract

Filter-and-throttle units (10) are known which comprise a housing (12) with housing walls (14, 16), and which comprise an opening (18) that acts as a throttle and is formed in one of the housing walls (14, 16). According to the invention, a filter element (24) is situated within the housing walls (14, 16) of the housing (12), as a result of which additional assembly steps are eliminated. Moreover, scroll compressors (26) for refrigerant circuits are known which have an orbiting displacement spiral (78) that engages in a fixed stator spiral (80). Said scroll compressors have an oil return channel (114) via which the high-pressure chamber (92) is fluidically connected to the low-pressure chamber (88), and a gas connection channel (118) via which the counter-pressure chamber (60) is fluidically connected to the high-pressure chamber (92). In order to simplify the assembly of these scroll compressors and extend their lifespan, according to the invention a filter-and-throttle unit (10) is situated in the gas connection channel (118) and/or in the oil return channel (114).

Description

B E S C H R E I B U N G DESCRIPTION
Filter- und Drosseleinheit für einen Scrollkompressor sowie Scrollkompressor für einen Kältemittelkreislauf Filter and throttle unit for a scroll compressor and scroll compressor for a refrigerant circuit
Die Erfindung betrifft eine Filter- und Drosseleinheit für einen Sero II ko m pressor mit einem Gehäuse mit Gehäusewänden und einer als Drossel oder Blende dienenden Öffnung, die in einer der Gehäusewände ausgebildet ist, sowie einen Scrollkompressor für einen Kältemittelkreislauf mit einem Antrieb, einer mittels des Antriebs antreibbaren Exzentereinheit, über die eine orbitierende Verdrängerspirale bewegbar ist, welche in eine feststehende Statorspirale greift, zumindest einem Verdrängerraum zwischen der Statorspirale und der Verdrängerspirale, einer Hochdruckkammer, in die der zumindest eine Verdrängerraum mündet, einer Niederdruckkammer, die in den zumindest einen Verdrängerraum mündet, einem Ölrückführungskanal, über den die Hochdruckkammer mit der Niederdruckkammer fluidisch verbunden ist, einer Gegendruckkammer, die an der von der Statorspirale abgewandten Seite der Verdrängerspirale ausgebildet ist, und einem Gasverbindungskanal, über den die Gegendruckkammer mit der Hochdruckkammer fluidisch verbunden ist. The invention relates to a filter and throttle unit for a Sero II compressor with a housing with housing walls and an opening that serves as a throttle or orifice, which is formed in one of the housing walls, and a scroll compressor for a refrigerant circuit with a drive, a Drive-driven eccentric unit, via which an orbiting displacement spiral can be moved, which engages in a fixed stator spiral, at least one displacement space between the stator spiral and the displacement spiral, a high-pressure chamber into which the at least one displacement space opens, a low-pressure chamber that opens into the at least one displacement space , an oil return channel via which the high-pressure chamber is fluidly connected to the low-pressure chamber, a back-pressure chamber which is formed on the side facing away from the stator spiral of the displacer spiral, and a gas connection channel via which the back-pressure chamber with the Hochdruckka is always fluidly connected.
Solche Scrollkompressoren werden insbesondere zur Verdichtung von Kältemitteln in Kälte- und Klimakreisläufen von Kraftfahrzeugen verwendet. Das in den Scrollkompressor eintretende, entspannte Kältemittel befindet sich im gasförmigen Zustand und strömt zumindest bei elektromotorisch angetriebenen Scrollkompressoren üblicherweise motorseitig in das Gehäuse ein, so dass der Elektromotor vom Kältemittel durchströmt wird. Auch nimmt das Kältemittel zur Schmierung notwendiges Öl im Motorraum auf, welches üblicherweise in einem Ölabscheider am Scrollkompressor vom Kältemittel getrennt wird und zur Schmierung in den Scrollkompressor zurückgeführt wird. Das verdichtete Kältemittel gelangt über einen Austritt zurück in den Kältemittelkreislauf. Such scroll compressors are used in particular for compressing refrigerants in refrigeration and air conditioning circuits in motor vehicles. The expanded refrigerant entering the scroll compressor is in the gaseous state and usually flows into the housing on the motor side, at least in the case of scroll compressors driven by an electric motor, so that the refrigerant flows through the electric motor. The refrigerant also absorbs the oil in the engine compartment that is required for lubrication, which is usually separated from the refrigerant in an oil separator on the scroll compressor and is fed into the scroll compressor for lubrication is returned. The compressed refrigerant returns to the refrigerant circuit via an outlet.
Derartige Scrollkompressoren sind beispielsweise aus der EP 3 404 264 Al bekannt und umfassen eine Hochdruckkammer, eine Niederdruckkammer, eine orbitierende Verdrängerspirale und eine mit der Verdrängerspirale zusammenwirkende, feststehende Statorspirale. Die orbitierende Verdrängerspirale greift in die Statorspirale derart ein, dass zwischen der Verdrängerspirale und der Statorspirale Verdrängungsräume gebildet werden, in denen das zu verdichtende Medium aufgenommen und verdichtet wird. Zwischen dem Lagergehäuse des Kompressors und der Verdrängerspirale ist eine Gegendruckkammer vorgesehen. Der in der Gegendruckkammer herrschende und auf die Verdrängerspirale wirkende Druck verursacht eine resultierende Kraft in axialer Richtung, wodurch die Verdrängerspirale gegen die feststehende Spirale gedrückt wird und somit die Spiralen zueinander abgedichtet werden. Such scroll compressors are known, for example, from EP 3 404 264 A1 and comprise a high-pressure chamber, a low-pressure chamber, an orbiting displacement coil and a fixed stator coil that interacts with the displacement coil. The orbiting displacement spiral engages in the stator spiral in such a way that displacement spaces are formed between the displacement spiral and the stator spiral, in which the medium to be compressed is received and compressed. A back pressure chamber is provided between the bearing housing of the compressor and the displacer scroll. The pressure prevailing in the counter-pressure chamber and acting on the displacement scroll causes a resultant force in the axial direction, as a result of which the displacement scroll is pressed against the fixed scroll and the scrolls are thus sealed off from one another.
Zur Verwirklichung des Anpressdrucks in der Gegendruckkammer besteht eine fluidische Verbindung zwischen der Hochdruckkammer und der Gegendruckkammer über einen Gasverbindungskanal, wodurch das unter hohem Druck stehende Fluid aus der Hochdruckkammer auch in der Gegendruckkammer anliegt. In dem Gasverbindungskanal ist eine Gasverbindungs-Drossel oder Blende angeordnet, welche den Massenstrom des in die Gegendruckkammer strömenden Fluids steuert und den Druck reduziert. To realize the contact pressure in the counter-pressure chamber, there is a fluidic connection between the high-pressure chamber and the counter-pressure chamber via a gas connection channel, as a result of which the high-pressure fluid from the high-pressure chamber is also present in the counter-pressure chamber. A gas connection throttle or orifice is arranged in the gas connection channel, which controls the mass flow of the fluid flowing into the counter-pressure chamber and reduces the pressure.
Des Weiteren umfasst der Scrollkompressor einen Ölrückführungskanal, welcher die Hochdruckkammer mit der Niederdruckkammer fluidisch verbindet. Dabei wird ein zur Schmierung der Komponenten in dem Scrollkompressor vorgesehenes Öl aus dem verdichteten Fluid über einen in der Hochdruckkammer angeordneten Abscheider abgetrennt und über den Ölrückführungskanal in die Niederdruckkammer zurückgeführt, so dass das zurückgeführte Öl erneut zur Schmierung der Komponenten verwendet werden kann. Zur Druckreduzierung des zurückgeführten Öls ist im Ölrückführungskanal eine Ölrückführungs-Drossel angeordnet. Furthermore, the scroll compressor includes an oil return channel which fluidly connects the high-pressure chamber to the low-pressure chamber. In this case, an oil provided for lubricating the components in the scroll compressor is separated from the compressed fluid via a separator arranged in the high-pressure chamber and returned to the low-pressure chamber via the oil return channel, so that the returned oil can be used again to lubricate the components. An oil return throttle is arranged in the oil return channel to reduce the pressure of the returned oil.
Des Weiteren ist aus der US 2005/0129556 Al ein Scrollkompressor bekannt, bei dem in der Ölrückführungsleitung zusätzlich zur Drossel noch ein Filterelement angeordnet ist, um Schmutzstoffe aus dem Öl zu filtern. Furthermore, a scroll compressor is known from US 2005/0129556 A1, in which a filter element is also arranged in the oil return line in addition to the throttle, in order to filter contaminants from the oil.
Nachteilig an den bekannten Scrollkompressoren ist, dass entweder gar keine Filterung des zurückgeführten Gases und Öls stattfindet oder der Aufwand zur Herstellung und Montage des Filterelementes und der Drossel sehr hoch ist. Zusätzlich ist eine Verstopfung der Filterelemente in den Rückführungskanälen zu befürchten. A disadvantage of the known scroll compressors is that either the recirculated gas and oil are not filtered at all, or the effort involved in manufacturing and assembling the filter element and the throttle is very high. In addition, there is a risk of the filter elements in the return channels becoming clogged.
Es stellt sich daher die Aufgabe, eine Filter- und Drosseleinheit bereitzustellen, die einfach herstellbar und mit geringem Aufwand in einem Scrollkompressor montiert werden kann. Des Weiteren soll ein Verstopfen der Filterelemente im Scrollkompressor verhindert werden. The object is therefore to provide a filter and throttle unit that can be manufactured easily and installed in a scroll compressor with little effort. Furthermore, clogging of the filter elements in the scroll compressor should be prevented.
Diese Aufgaben werden durch eine Filter- und Drosseleinheit mit den Merkmalen des Hauptanspruchs 1 und einen Scrollkompressor für einen Kältemittelkreislauf mit den Merkmalen des Hauptanspruchs 9 gelöst. These objects are achieved by a filter and throttle unit with the features of main claim 1 and a scroll compressor for a refrigerant circuit with the features of main claim 9.
Die erfindungsgemäße Filter- und Drosseleinheit für einen Scrollkompressor weist ein Gehäuse mit Gehäusewänden auf, die eine Außenwand der Filter- und Drosseleinheit bilden und somit die Einheit axial und radial begrenzen. In einer dieser begrenzenden Wände ist eine als Drossel oder Blende dienende Öffnung ausgebildet. Des Weiteren ist innerhalb der Gehäusewände, und somit ebenfalls zumindest radial durch die Gehäusewände begrenzt, ein Filterelement angeordnet. Entsprechend wird eine Einheit aus Drossel oder Blende und Filterelement geschaffen, die einfach als Ganzes in eine entsprechende Aufnahme am Scrollkompressor eingesetzt werden kann, wodurch die Montage deutlich vereinfacht wird. Des Weiteren wird die Herstellung vereinfacht, da die Gehäusewand direkt durch die Ausbildung der Öffnung als Drossel oder Blende dient, ohne dass hierzu zusätzliche Bauteile montiert werden müssen. The filter and throttle unit according to the invention for a scroll compressor has a housing with housing walls that form an outer wall of the filter and throttle unit and thus delimit the unit axially and radially. An opening serving as a throttle or screen is formed in one of these limiting walls. Furthermore, a filter element is arranged within the housing walls, and thus likewise delimited at least radially by the housing walls. Accordingly, a unit consisting of a throttle or screen and a filter element is created, which can simply be inserted as a whole into a corresponding receptacle on the scroll compressor can be used, making assembly much easier. Furthermore, the production is simplified, since the housing wall serves as a throttle or diaphragm directly through the formation of the opening, without additional components having to be installed for this purpose.
Der erfindungsgemäße Scrollkompressor weist einen Antrieb auf, der insbesondere durch einen Elektromotor gebildet werden kann. Durch diesen wird eine Exzentereinheit angetrieben, die mit einer Verdrängerspirale bewegungsgekoppelt ist, so dass dies eine orbitierende, also exzentrische Rotationsbewegung ausführt. Die Verdrängerspirale ist zumeist auf einer Gleitscheibe angeordnet und greift in eine feststehende Statorspirale, die mit der Verdrängerspirale einen oder mehrere Verdrängerräume begrenzt, die bei Rotation der Verdrängerspirale entlang der Statorspirale reduziert werden, so dass eine Kompression des Mediums in den umlaufenden Verdrängerräumen erfolgt. Der letzte Verdrängerraum mündet in einer Hochdruckkammer, in die das verdichtete Medium beispielsweise über ein Auslassventil strömt. Der Scrollkompressor weist zusätzlich eine Niederdruckkammer auf, die in den äußeren Verdrängerraum mündet und als Einlass dient, wobei auch der gesamte Raum, in dem der Elektromotor angeordnet werden kann, die Niederdruckkammer bildet. Diese wird entsprechend vom gesamten umfassten Raum des Scrollkompressors gebildet, in dem das zu verdichtende Fluid in einem entspannten Zustand vorhanden ist, in dem es auch in den Scrollkompressor strömt. Des Weiteren ist ein Ölrückführungskanal ausgebildet, über den die Hochdruckkammer mit der Niederdruckkammer fluidisch verbunden ist, wobei die fluidische Verbindung üblicherweise nicht direkt, sondern über eine Ölabscheidekammer erfolgt. Zusätzlich weist der Scrollkompressor eine Gegendruckkammer auf, die an der von der Statorspirale abgewandten Seite der Verdrängerspirale ausgebildet ist, wobei ein Gasverbindungskanal die Gegendruckkammer mit der Hochdruckkammer fluidisch verbindet, um einen Gegendruck zu erzeugen, durch den die Verdrängerspirale gegen die Statorspirale belastet wird. Im Gasverbindungskanal und/oder im Ölrückführungskanal wird erfindungsgemäß eine Filter- und Drosseleinheit angeordnet, die ein Gehäuse mit Gehäusewänden aufweist, welche die Filter- und Drosseleinheit nach außen begrenzen. In einer dieser begrenzenden Wände der Filter- und Drosseleinheit ist eine als Drossel oder Blende dienende Öffnung ausgebildet. Des Weiteren ist innerhalb eines durch die Gehäusewände begrenzten Raumes ein Filterelement angeordnet. Diese Ausbildung einer Filter- und Drosseleinheit ermöglicht ein einfaches Einsetzen der Einheit aus Filter und Drossel oder Blende in eine entsprechende Aufnahmeöffnung im Scrollkompressor in einem Montageschritt. Die Befestigung kann durch einfaches Einpressen erfolgen. Dabei bleibt die Einheit aus Drossel oder Blende und Filter leicht zugänglich und austauschbar. The scroll compressor according to the invention has a drive which can be formed in particular by an electric motor. This drives an eccentric unit, which is coupled in motion to a displacement spiral, so that it performs an orbiting, i.e. eccentric, rotational movement. The displacement spiral is usually arranged on a sliding disc and engages in a fixed stator spiral, which delimits one or more displacement spaces with the displacement spiral, which are reduced when the displacement spiral rotates along the stator spiral, so that the medium is compressed in the surrounding displacement spaces. The last displacement chamber opens into a high-pressure chamber into which the compressed medium flows, for example via an outlet valve. The scroll compressor also has a low-pressure chamber, which opens into the outer displacement space and serves as an inlet, with the entire space in which the electric motor can be arranged also forming the low-pressure chamber. This is correspondingly formed by the entire enclosed space of the scroll compressor, in which the fluid to be compressed is present in a relaxed state, in which it also flows into the scroll compressor. Furthermore, an oil return channel is formed, via which the high-pressure chamber is fluidically connected to the low-pressure chamber, the fluidic connection usually not taking place directly but via an oil separation chamber. In addition, the scroll compressor has a back pressure chamber which is formed on the side of the displacer scroll which is remote from the stator scroll, with a gas connection channel fluidically connecting the back pressure chamber to the high pressure chamber in order to generate a back pressure by which the displacer scroll is loaded against the stator scroll. In the gas connection channel and / or in According to the invention, a filter and throttle unit is arranged in the oil return duct, which has a housing with housing walls which limit the filter and throttle unit to the outside. In one of these limiting walls of the filter and choke unit, an opening serving as a choke or diaphragm is formed. Furthermore, a filter element is arranged within a space delimited by the housing walls. This design of a filter and throttle unit enables the unit consisting of filter and throttle or screen to be easily inserted into a corresponding receiving opening in the scroll compressor in one assembly step. It can be attached by simply pressing it in. The unit consisting of the choke or screen and filter remains easily accessible and replaceable.
Bezüglich der Filter- und Drosseleinheit ist es vorteilhaft, wenn das Gehäuse eine axial begrenzende Gehäusewand, in der die als Drossel oder Blende dienende Öffnung ausgebildet ist, und eine ringförmige, radial begrenzende Gehäusewand aufweist, die sich von der axial begrenzenden Gehäusewand axial erstreckt. Es wird entsprechend ein im Wesentlichen topfförmiges Bauteil geschaffen, dessen Gehäuse nicht weiter montiert werden muss, sondern einteilig hergestellt werden kann. With regard to the filter and throttle unit, it is advantageous if the housing has an axially delimiting housing wall in which the opening serving as a throttle or diaphragm is formed, and an annular, radially delimiting housing wall which extends axially from the axially delimiting housing wall. Accordingly, an essentially pot-shaped component is created, the housing of which does not have to be assembled further, but can be produced in one piece.
Vorzugsweise ist das Filterelement plattenförmig ausgeführt und begrenzt die Filter- und Drosseleinheit zu einer axialen Seite. So ist das Filterelement einfach erreichbar und in das Gehäuse montierbar. Durch die plattenförmige Ausbildung wird insbesondere bei liegend angeordneten Kompressoren eine Oberfläche durch das Filterelement geschaffen, die senkrecht zur Gravitationskraft angeordnet werden kann, so dass ohne äußere Kräfte eine Selbstreinigung des Filterelementes erfolgt. Die ausgefilterten Feststoffe setzen sich auch während des Betriebes nicht am Filterelement fest. The filter element is preferably designed in the form of a plate and delimits the filter and throttle unit on one axial side. This means that the filter element can be easily reached and installed in the housing. The plate-shaped configuration creates a surface through the filter element, particularly in the case of compressors arranged horizontally, which surface can be arranged perpendicularly to the gravitational force, so that the filter element is self-cleaning without external forces. The filtered solids do not settle on the filter element even during operation.
In einer weiteren bevorzugten Ausführung ist das Filterelement als Filtersieb ausgebildet, welches radial durch ein Dichtelement begrenzt ist, welches im Gehäuse befestigt ist. Durch das Dichtelement wird sichergestellt, dass kein Öl oder Gas am Filterelement vorbeiströmen kann. Das Sieb weist eine ausreichende Filterwirkung bei hoher Haltbarkeit auf. Des Weiteren kann das Filtersieb über das Dichtelement einfach im Gehäuse befestigt werden. In a further preferred embodiment, the filter element is designed as a filter screen, which is limited radially by a sealing element, which in the housing is attached. The sealing element ensures that no oil or gas can flow past the filter element. The sieve has a sufficient filter effect with high durability. Furthermore, the filter screen can be easily fixed in the housing via the sealing element.
Vorzugsweise ist das Gehäuse als Stanzteil ausgebildet, in dem das Filterelement mit dem Dichtelement formschlüssig befestigt ist. Die Ausführung als Stanzteil ist ebenso besonders kostengünstig wie die formschlüssige Befestigung des Filterelementes mit dem Dichtelement. Diese Befestigung kann beispielsweise durch einfaches Umformen des axialen Endes der ringförmigen Gehäusewand erfolgen. The housing is preferably designed as a stamped part, in which the filter element is fastened in a form-fitting manner with the sealing element. The design as a stamped part is also particularly cost-effective, as is the form-fitting attachment of the filter element to the sealing element. This attachment can be done, for example, by simply reshaping the axial end of the annular housing wall.
In einer weiterführenden Ausführungsform liegt das Dichtelement mit einer ersten axialen Seite gegen die axial begrenzende Gehäusewand an und mit seiner entgegengesetzten axialen Seite gegen einen sich zumindest teilweise nach radial innen erstreckenden Kragen der radial begrenzenden Gehäusewand an. So kann auf einfache Weise die formschlüssige Verbindung zwischen dem Dichtelement und dem Gehäuse hergestellt werden. In a further embodiment, the sealing element rests with a first axial side against the axially delimiting housing wall and with its opposite axial side against a collar of the radially delimiting housing wall that extends at least partially radially inwards. In this way, the form-fitting connection between the sealing element and the housing can be established in a simple manner.
Eine dichte Verbindung wird erreicht, wenn das Dichtelement zwischen dem Kragen und der axial begrenzenden Gehäusewand axial verpresst ist, wodurch sichergestellt wird, dass das Gas oder das Öl ausschließlich über das Filterelement strömen kann, welches von der Dichtung umgeben ist. A tight connection is achieved when the sealing element is axially pressed between the collar and the axially delimiting housing wall, which ensures that the gas or oil can only flow through the filter element, which is surrounded by the seal.
Besonders bevorzugt ist es, wenn das Filtersieb radial außen mit einem Kunststoff des Dichtelementes umspritzt ist, so dass das Filtersieb mit dem Dichtelement als ein Teil in das Gehäuse eingesetzt und dort befestigt werden kann, was die Montage und Herstellung zusätzlich erleichtert. Alternativ könnte das Filtersieb zwischen zwei verpressten Dichtelementen innerhalb des Gehäuses eingesetzt werden oder zwischen dem Kragen und einem Dichtelement befestigt werden. In einer weiterführenden Ausbildung des erfindungsgemäßen Scrollkompressors erstreckt sich der Gasverbindungskanal und/oder der Ölrückführungskanal zumindest abschnittsweise durch die Statorspirale. Diese Kanäle können auf einfache Weise bereits bei der Herstellung der Spirale eingebracht werden, so dass keine zusätzliche Bearbeitung notwendig ist. It is particularly preferred if the filter screen is encapsulated radially on the outside with a plastic of the sealing element, so that the filter screen can be inserted into the housing with the sealing element as one part and fastened there, which additionally facilitates assembly and manufacture. Alternatively, the filter screen could be inserted between two pressed sealing elements within the housing or secured between the collar and a sealing element. In a further development of the scroll compressor according to the invention, the gas connection channel and/or the oil return channel extends at least in sections through the stator spiral. These channels can easily be incorporated during manufacture of the spiral, so that no additional processing is necessary.
In einer hierzu weiterführenden bevorzugten Ausführungsform ist die Filter- und Drosseleinheit in der Statorspirale befestigt. Insbesondere kann die Filter- und Drosseleinheit einfach bereits vor der Montage der Statorspirale im Gehäuse des Kompressors in die entsprechenden Kanäle eingeschoben werden. In a further preferred embodiment, the filter and throttle unit is fastened in the stator spiral. In particular, the filter and throttle unit can simply be pushed into the corresponding channels in the housing of the compressor before the stator spiral is installed.
Besonders vorteilhaft ist es, wenn die Filter- und Drosseleinheit in einer Einlassöffnung an einer Deckscheibe der Statorspirale eingepresst ist, wobei das Filterelement plattenförmig ausgebildet ist und die Hochdruckkammer begrenzt. In diesem Fall erstreckt sich das Filterelement auf gleicher Höhe mit der die Hochdruckkammer begrenzenden Wandfläche der Deckscheibe der Statorspirale, so dass eine gemeinsame Wandfläche gebildet wird. Somit besteht kein Raum, in dem sich die ausgefilterten Schmutzstoffe vor dem Filterelement absetzen können. Stattdessen werden diese bei der üblichen liegenden Bauweise des Kompressors aufgrund der Gravitationskraft immer von der Oberfläche des Filterelementes wieder in den Hochdruckraum fallen, wodurch ein Verstopfen des Filterelementes verhindert wird. It is particularly advantageous if the filter and throttle unit is pressed into an inlet opening on a cover plate of the stator spiral, the filter element being plate-shaped and delimiting the high-pressure chamber. In this case, the filter element extends at the same level as the wall surface of the cover disk of the stator spiral that delimits the high-pressure chamber, so that a common wall surface is formed. This means that there is no space in which the filtered out contaminants can settle in front of the filter element. Instead, with the usual horizontal design of the compressor, these will always fall from the surface of the filter element back into the high-pressure chamber due to the gravitational force, which prevents the filter element from becoming clogged.
Vorzugsweise erstreckt sich der Gasverbindungskanal von der Hochdruckkammer durch die Statorspirale und ein Lagergehäuseteil zur Gegendruckkammer. So müssen wenige Bauteile bei der Montage exakt zueinander ausgerichtet werden, in denen der Kanal einfach hergestellt werden kann. Vorzugsweise ist die Hochdruckkammer mit einer Ölabscheidekammer verbunden, in welcher ein Ölabscheider angeordnet ist. Dieser ermöglicht die Abscheidung und Rückführung des Öls in die Niederdruckkammer, so dass die Ölbelastung nachfolgender Komponenten geringgehalten werden kann. The gas connection channel preferably extends from the high-pressure chamber through the stator spiral and a bearing housing part to the counter-pressure chamber. So few components have to be precisely aligned with each other during assembly, in which the channel can be easily produced. The high-pressure chamber is preferably connected to an oil separation chamber in which an oil separator is arranged. This enables the oil to be separated and returned to the low-pressure chamber, so that the oil load on downstream components can be kept low.
Der Ölrückführungskanal erstreckt sich vorzugsweise ausgehend von einem tiefsten Punkt der Ölabscheidekammer durch ein Kopfgehäuseteil, die Statorspirale und das Lagergehäuseteil zur Niederdruckkammer erstreckt. Eine solche Aufteilung und Anordnung stellt eine vollständige Rückführung des Öls sicher und ermöglicht eine einfache Herstellung und Montage. The oil return channel preferably extends, starting from a lowest point of the oil separation chamber, through a head housing part, the stator spiral and the bearing housing part to the low-pressure chamber. Such a division and arrangement ensures complete recirculation of the oil and allows for ease of manufacture and assembly.
Vorzugsweise ist die Einlassöffnung des Gasverbindungskanals in Strömungsrichtung des Gases vor dem Ölabscheider angeordnet, so dass in die Gegendruckkammer und damit in das Lagergehäuse ein Gas-Ölgemisch gelangt, wodurch sichergestellt wird, dass die dort vorhandenen Lager und beweglichen Teile ausreichend geschmiert werden. The inlet opening of the gas connection channel is preferably arranged in front of the oil separator in the flow direction of the gas, so that a gas-oil mixture reaches the counter-pressure chamber and thus the bearing housing, which ensures that the bearings and moving parts present there are sufficiently lubricated.
Es wird somit eine Filter- und Drosseleinheit sowie ein Scrollkompressor für einen Kältemittelkreislauf eines Kraftfahrzeugs mit einer derartigen Filter- und Drosseleinheit geschaffen, die einfach hergestellt und montiert werden können. So werden Kosten sowohl bei der Herstellung der Filter- und Drosseleinheit als auch bei deren Montage am Kompressor reduziert. Des Weiteren wird eine Selbstreinigung des Filterelementes erreicht, wodurch auch ein Verstopfen der Rückführleitungen verhindert wird. A filter and throttle unit and a scroll compressor for a refrigerant circuit of a motor vehicle with such a filter and throttle unit are thus created, which can be easily manufactured and installed. This reduces costs both in the production of the filter and throttle unit and in their assembly on the compressor. Furthermore, the filter element is self-cleaning, which also prevents the return lines from becoming clogged.
Ein Ausführungsbeispiel einer erfindungsgemäßen Filter- und Drosseleinheit sowie eines erfindungsgemäßen Scrollkompressors ist in den Figuren dargestellt und werden nachfolgend beschrieben. Figur 1 zeigt eine perspektivische Ansicht einer erfindungsgemäßen Drossel- und Filtereinheit. An exemplary embodiment of a filter and throttle unit according to the invention and a scroll compressor according to the invention is shown in the figures and will be described below. FIG. 1 shows a perspective view of a throttle and filter unit according to the invention.
Figur 2 zeigt eine Seitenansicht der erfindungsgemäßen Filter- und Drosseleinheit aus Figur 1 in geschnittener Darstellung. FIG. 2 shows a side view of the filter and throttle unit according to the invention from FIG. 1 in a sectional representation.
Figur 3 zeigt eine Seitenansicht eines erfindungsgemäßen Scrollkompressors für einen Kältemittelkreislauf eines Kraftfahrzeugs mit einer in den Figuren 1 und 2 dargestellten Filter- und Drosseleinheit in geschnittener Darstellung. FIG. 3 shows a side view of a scroll compressor according to the invention for a refrigerant circuit of a motor vehicle with a filter and throttle unit shown in FIGS. 1 and 2 in a sectional view.
Die in den Figuren 1 und 2 dargestellte Filter- und Drosseleinheit 10 weist ein Gehäuse 12 auf, welches aus einer axial begrenzenden Gehäusewand 14, die im radial inneren Bereich im vorliegenden Ausführungsbeispiel etwas dünner ausgeführt ist, sowie einer ringförmigen, die Filter- und Drosseleinheit 10 radial begrenzenden Gehäusewand 16 besteht, die sich axial vom radial äußeren Rand der axial begrenzenden Gehäusewand 14 aus erstreckt. Dieses Gehäuse kann besonders einfach aus Blech durch Stanzen und Umbiegen hergestellt werden. The filter and throttle unit 10 shown in Figures 1 and 2 has a housing 12, which consists of an axially delimiting housing wall 14, which is somewhat thinner in the radially inner area in the present exemplary embodiment, and an annular filter and throttle unit 10 radially delimiting housing wall 16 which extends axially from the radially outer edge of the axially delimiting housing wall 14 . This housing can be made particularly easily from sheet metal by stamping and bending.
In dem inneren dünneren Bereich der axial begrenzenden Gehäusewand 14 ist eine als Drossel oder Blende dienende schmale Öffnung 18 ausgebildet. Im Inneren der radial begrenzenden Gehäusewand 16 ist ein ringförmiges Dichtelement 20 zwischen der axial begrenzenden Gehäusewand 14 und einem als Kragen 22 ausgebildeten axialen Endabschnitt der ringförmigen radial begrenzenden Gehäusewand 16, der nach radial innen gebogen ist, eingeklemmt und axial verpresst. Entsprechend liegt die erste axiale Seite des Dichtelementes 20 gegen die axial begrenzende Wand 14 und die entgegengesetzte axiale Seite des Dichtelementes 20 gegen den Kragen 22 an. An der offenen Seite des Gehäuses 12 ist ein als Filtersieb ausgebildetes Filterelement 24 angeordnet, welches plattenförmig ausgebildet ist und dessen radial äußerer Rand entweder vom Kunststoff des Dichtelementes 20 umspritzt ist oder axial zwischen zwei Dichtelementen 20 oder zwischen dem Kragen 22 und dem Dichtelement 20 eingeklemmt ist. Entsprechend kann Öl oder Kältemittel über das Filterelement 24 in das Gehäuse 12 einströmen, so dass Feststoffe aus dem Öl- oder Kältemittelstrom ausgefiltert werden, und über die als Drossel oder Blende dienende Öffnung wieder aus der Filter- und Drosseleinheit 10 ausströmen, wobei der Druck hinter der Öffnung 18 kleiner ist als der Druck vor der Öffnung 18. Auch wird der Massenstrom durch die Querschnittsverengung deutlich reduziert. In the inner, thinner area of the axially delimiting housing wall 14, a narrow opening 18 serving as a throttle or screen is formed. Inside the radially delimiting housing wall 16, an annular sealing element 20 is clamped and axially pressed between the axially delimiting housing wall 14 and an axial end section of the annular radially delimiting housing wall 16 designed as a collar 22, which is bent radially inwards. Correspondingly, the first axial side of the sealing element 20 rests against the axially limiting wall 14 and the opposite axial side of the sealing element 20 against the collar 22 . A filter element 24 designed as a filter screen is arranged on the open side of the housing 12, which is designed as a plate and whose radially outer edge is either encapsulated by the plastic of the sealing element 20 or is clamped axially between two sealing elements 20 or between the collar 22 and the sealing element 20 . Correspondingly, oil or refrigerant can flow into the housing 12 via the filter element 24, so that solids are filtered out of the oil or refrigerant flow, and can flow out of the filter and throttle unit 10 again via the opening serving as a throttle or orifice, with the pressure behind of the opening 18 is smaller than the pressure in front of the opening 18. The mass flow is also significantly reduced by the narrowing of the cross section.
In der Figur ist ein erfindungsgemäßer Scrollkompressor 26 dargestellt, der ein mehrteiliges Verdichtergehäuse 28 mit einem ersten Motorgehäuseteil 30 und einem sich axial daran anschließenden Kopfgehäuseteil 32 aufweist, wobei das Motorgehäuseteil 30 einen Antrieb 34 in Form eines Elektromotors umgibt und das Kopfgehäuseteil 32 einen Verdichterraum 36 umgibt. The figure shows a scroll compressor 26 according to the invention, which has a multi-part compressor housing 28 with a first motor housing part 30 and a head housing part 32 adjoining it axially, with the motor housing part 30 enclosing a drive 34 in the form of an electric motor and the head housing part 32 enclosing a compressor chamber 36 .
Der Antrieb 34 weist einen Stator 38 mit Wicklungen 40 und einen innenliegenden Rotor 42 mit Permanentmagneten 44 auf, der auf einer Welle 46 befestigt ist. Die Welle 46 und damit der Rotor 26 sind einerseits über ein Kugellager 48 gelagert, welches in einer Aufnahmeöffnung an einer axial begrenzenden Rückwand 50 des Motorgehäuseteils 30 angeordnet ist und andererseits über ein zweites Kugellager 52 gelagert, welches in einer Aufnahme eines Lagergehäuseteils 54 angeordnet ist, das an der zur Rückwand 50 axial entgegengesetzten Seite im radial Inneren des Motorgehäuseteils 30 befestigt ist. Zwischen dem Rotor 42 und dem zweiten Kugellager 52 ist im Lagergehäuseteil 54 ein Wellendichtring 56 angeordnet, über den ein Motorraum 58, in dem der Antrieb 34 angeordnet ist, gegenüber eine Gegendruckkammer 60 abgedichtet wird, die an der zum Motorraum 58 entgegengesetzten axialen Seite des Lagergehäuseteils 54 ausgebildet ist. The drive 34 has a stator 38 with windings 40 and an internal rotor 42 with permanent magnets 44 which is fastened on a shaft 46 . The shaft 46 and thus the rotor 26 are mounted on the one hand via a ball bearing 48 which is arranged in a receiving opening on an axially delimiting rear wall 50 of the motor housing part 30 and on the other hand via a second ball bearing 52 which is arranged in a receptacle of a bearing housing part 54. which is fastened on the side axially opposite to the rear wall 50 in the radially inside of the motor housing part 30 . Between the rotor 42 and the second ball bearing 52, a shaft sealing ring 56 is arranged in the bearing housing part 54, via which a motor compartment 58, in which the drive 34 is arranged, is sealed against a counter-pressure chamber 60, which is at the is formed on the axial side of the bearing housing part 54 opposite to the engine compartment 58 .
An der zum Elektromotor 34 entgegengesetzten Seite der Rückwand 50 ist ein Elektronikraum 62 ausgebildet, in dem eine Platine 64 mit der Leistungselektronik 66 befestigt ist. Diese ist mit den Wicklungen 40 des Stators 38 verbunden, so dass dieser gesteuert bestromt werden kann. Die Stromversorgung der Leistungselektronik 66 erfolgt über einen Stecker 68, der sich parallel zur Motorachse von der Rückwand 50 aus erstreckt. Der Elektronikraum 62 wird durch einen Deckel 70 verschlossen. On the side of the rear wall 50 opposite the electric motor 34 there is an electronics space 62 in which a circuit board 64 with the power electronics 66 is fastened. This is connected to the windings 40 of the stator 38 so that it can be supplied with current in a controlled manner. The power electronics 66 are supplied with power via a plug 68 which extends parallel to the axis of the motor from the rear wall 50 . The electronics space 62 is closed by a cover 70 .
Auf dem zum Verdichterraum 36 weisenden Ende der Welle 46 ist eine Exzentereinheit 72 ausgebildet, auf deren Ausgangszapfen 74 ein Exzenterwellenlager 76 angeordnet ist, auf dem eine orbitierende Verdrängerspirale 78 exzentrisch gelagert ist, welche mit einer Statorspirale 80 korrespondiert, die im Kopfgehäuseteil 32 und am Lagergehäuseteil 54 befestigt ist, so dass bei exzentrischer Drehung der Verdrängerspirale 78 deren Wände 82 an den Wänden 84 der Statorspirale 80 unter Bildung von mehreren Verdrängerräumen 86 entlanggleiten, wodurch die Verdrängerräume 86 in ihrer Ausdehnung verringert werden und so das aus einer Niederdruckkammer 88 angesaugte Kältemittel komprimiert wird. Der Einlass von der Niederdruckkammer 88 in die Verdrängerräume 86 ist radial zwischen dem Kopfgehäuseteil 32 und der feststehenden Statorspirale 80 ausgebildet, so dass das Kältemittel aus der Niederdruckkammer 88 nach radial innen durch die Verdrängerräume 86 in Richtung eines Auslasses 90, der an einer Deckscheibe 91 der Statorspirale 80 ausgebildet ist, in eine Hochdruckkammer 92 über ein als Blattfederelement ausgeführtes Rückschlagventil 94 gefördert wird. Die Versorgung der Niederdruckkammer 88 mit dem Kältemittel erfolgt über einen nicht sichtbaren Verdichtereinlass, über den das Kältemittel in den Motorraum 58 strömt, der als Niederdruckkammer 88 dient. Zwischen dem Lagergehäuseteil 54 und der Statorspirale 80 sowie der orbitierenden Verdrängerspirale 78 ist eine Gleitscheibe 96 angeordnet, die im radial äußeren Bereich zwischen dem Kopfgehäuseteil 32 und dem Motorgehäuseteil 30 eingeklemmt ist. Diese Gleitscheibe 96 weist auch Öffnungen auf, durch die mehrere in der Figur nicht sichtbare Zapfen aus dem Lagergehäuseteil 54 in entsprechende Aufnahmen 98 der orbitierenden Verdrängerspirale 78 ragen, auf denen Gleitbuchsen 100 angeordnet sind, über die die Verdrängerspirale 78 zusätzlich gleitend gelagert ist. Zusätzlich weist die Verdrängerspirale 78 an der der Gleitscheibe 96 zugewandten Seite einen in einer umlaufenden Nut 102 angeordneten Gleit- und Dichtring 104 auf. Entsprechend ist die Verdrängerspirale 78 zur Welle 46 und zum Lagergehäuseteil 54 gleitend geführt angeordnet. An eccentric unit 72 is formed on the end of shaft 46 pointing towards compressor chamber 36, on whose output journal 74 an eccentric shaft bearing 76 is arranged, on which an orbiting displacement spiral 78 is eccentrically mounted, which corresponds to a stator spiral 80, which is located in head housing part 32 and on the bearing housing part 54 is fixed, so that when the displacement spiral 78 rotates eccentrically, its walls 82 slide along the walls 84 of the stator spiral 80 to form a plurality of displacement chambers 86, as a result of which the displacement chambers 86 are reduced in their expansion and the refrigerant sucked in from a low-pressure chamber 88 is compressed . The inlet from the low-pressure chamber 88 into the displacement chambers 86 is formed radially between the head housing part 32 and the fixed stator spiral 80, so that the refrigerant flows radially inward from the low-pressure chamber 88 through the displacement chambers 86 in the direction of an outlet 90, which is on a cover plate 91 of the Stator spiral 80 is formed, is conveyed into a high-pressure chamber 92 via a check valve 94 designed as a leaf spring element. The low-pressure chamber 88 is supplied with the refrigerant via a compressor inlet (not visible), through which the refrigerant flows into the engine compartment 58 , which serves as the low-pressure chamber 88 . A sliding disk 96 is arranged between the bearing housing part 54 and the stator spiral 80 and the orbiting displacement spiral 78 , which is clamped in the radially outer area between the head housing part 32 and the motor housing part 30 . This sliding disc 96 also has openings through which several pins (not visible in the figure) protrude from the bearing housing part 54 into corresponding receptacles 98 of the orbiting displacement scroll 78, on which sliding bushings 100 are arranged, via which the displacement scroll 78 is additionally slidably mounted. In addition, the displacement spiral 78 has a sliding and sealing ring 104 arranged in a circumferential groove 102 on the side facing the sliding disk 96 . Correspondingly, the displacer spiral 78 is arranged in a slidingly guided manner relative to the shaft 46 and to the bearing housing part 54 .
Die Hochdruckkammer 92 des Scrollkompressors 26 ist fluidisch mit einer Ölabscheidekammer 106 verbunden, in der ein Ölabscheider 108 in Form eines Zyklons angeordnet ist, so dass das leichtere, gasförmige Kältemittel zu einem Verdichterauslass 110 strömt, während das flüssige und schwerere Öl im Zyklon vom Kältemittel getrennt wird und zu einem tiefsten Punkt der Ölabscheidekammer 106, der durch einen Boden 112 gebildet wird, tropft. The high-pressure chamber 92 of the scroll compressor 26 is fluidly connected to an oil separation chamber 106 in which an oil separator 108 in the form of a cyclone is arranged so that the lighter, gaseous refrigerant flows to a compressor outlet 110, while the liquid and heavier oil is separated from the refrigerant in the cyclone is and to a lowest point of the oil separation chamber 106, which is formed by a floor 112 drips.
Zur Abführung des in der Ölabscheidekammer 106 abgesetzten Öls ist am Boden 112 der Ölabscheidekammer 106 der Anfang eines Ölrückführungskanals 114 vorgesehen, welcher die Ölabscheidekammer 106 und damit die Hochdruckkammer 92 mit der Niederdruckkammer 88 beziehungsweise dem Motorraum 58 fluidisch verbindet. Der Ölrückführungskanal 114 erstreckt sich durch das Kopfgehäuseteil 32, die feststehende Statorspirale 80, die Gleitscheibe 96 und durch das Lagergehäuseteil 54 in den Motorraum 58. To remove the oil that has settled in oil separation chamber 106, the start of an oil return channel 114 is provided on bottom 112 of oil separation chamber 106, which fluidly connects oil separation chamber 106 and thus high-pressure chamber 92 to low-pressure chamber 88 or engine compartment 58. The oil return passage 114 extends through the head housing part 32, the fixed stator spiral 80, the sliding washer 96 and through the bearing housing part 54 into the engine compartment 58.
Erfindungsgemäß ist die Filter- und Drosseleinheit 10 in eine Einlassöffnung 116 des Ölrückführungskanals 114 an der Deckscheibe 91 der Statorspirale 80 eingepasst, insbesondere eingepresst, so dass das Öl mit verringertem Druck und gefiltert in den Motorraum 58 zurückgeführt wird. According to the invention, the filter and throttle unit 10 is in an inlet opening 116 of the oil return channel 114 on the cover disk 91 of the stator spiral 80 fitted, in particular pressed in, so that the oil is returned to the engine compartment 58 with reduced pressure and filtered.
Des Weiteren erstreckt sich ein Gasverbindungskanal 118 von der Hochdruckkammer 92 durch die Statorspirale 80, die Gleitscheibe 96 und durch das Lagergehäuseteil 54 in die Gegendruckkammer 60, in der entsprechend ein zur Hochdruckkammer 92 reduzierter, jedoch zur Niederdruckkammer 88 erhöhter Druck vorliegt, wodurch die orbitierende Verdrängerspirale 78 gegen die Statorspirale 80 belastet wird, was zu einer verbesserten Abdichtung zwischen den Stirnflächen der orbitierenden Verdrängerspirale 78 und der feststehenden Statorspirale 80 führt. Furthermore, a gas connection channel 118 extends from the high-pressure chamber 92 through the stator volute 80, the sliding disk 96 and through the bearing housing part 54 into the counter-pressure chamber 60, in which the pressure is reduced compared to the high-pressure chamber 92 but increased to the low-pressure chamber 88, whereby the orbiting displacement volute 78 is loaded against the stator volute 80, resulting in an improved seal between the faces of the orbiting displacer volute 78 and the fixed stator volute 80.
Um diesen Druck einzustellen, befindet sich auch an einer Einlassöffnung 120 in den Gasverbindungskanal 118 an der Deckscheibe 91 der Statorspirale 80 eine erfindungsgemäße Filter- und Drosseleinheit 10, deren Öffnung 18 entsprechend groß ausgebildet wird und die in die Einlassöffnung 120 eingepresst werden kann. Zusätzlich wird durch das Filterelement 24 ein Eindringen von Schmutzstoffen in die Gegendruckkammer 60 verhindert, wodurch die dort angeordneten Kugellager 52, Exzenterwellenlager 76, Gleitbuchsen 100 und die Gleitscheibe 96 und der Gleit- und Dichtring 104 geschützt werden. In order to set this pressure, there is also a filter and throttle unit 10 according to the invention at an inlet opening 120 in the gas connection channel 118 on the cover disk 91 of the stator spiral 80, the opening 18 of which is designed to be correspondingly large and which can be pressed into the inlet opening 120. In addition, the filter element 24 prevents dirt from entering the counter-pressure chamber 60, whereby the ball bearings 52, eccentric shaft bearings 76, sliding bushes 100 and the sliding disk 96 and the sliding and sealing ring 104 arranged there are protected.
Sowohl an der Einlassöffnung 120 des Gasverbindungskanals 118 als auch an der Einlassöffnung 116 des Ölrückführungskanals 114 befindet sich somit etwa in einer Ebene mit der Deckscheibe 91 des Statorgehäuseteils 80 die Filterfläche des Filterelementes 24. Somit setzen sich dort ausgefilterte Schmutzstoffe nicht im Ölrückführungskanal 116 oder im Gasverbindungskanal 120 ab und setzt diese zu, sondern fällt aufgrund der Gravitationskraft in die Hochdruckkammer 92. Es findet somit eine Selbstreinigung statt. Entsprechend bleibt die Funktionalität des Ölrückführungskanals 116 und des Gasverbindungskanals 120 über eine lange Zeit erhalten. Des Weiteren können die Filter- und Drosseleinheiten 10 auf einfache Weise ausgebaut und ausgetauscht werden, da sie gut zugänglich und einfach montierbar und demontierbar sind. Auch können verschiedene gewünschte Gegendrücke durch Filter- und Drosseleinheiten 10 mit verschiedenen Öffnungsweiten eingestellt werden. The filter surface of the filter element 24 is thus located at the inlet opening 120 of the gas connection channel 118 as well as at the inlet opening 116 of the oil return channel 114 approximately in one plane with the cover disk 91 of the stator housing part 80. This means that contaminants filtered out there do not settle in the oil return channel 116 or in the gas connection channel 120 and clogs it, but falls into the high-pressure chamber 92 due to the force of gravity. Self-cleaning thus takes place. Accordingly, the functionality of the oil return channel 116 and the gas connection channel 120 is maintained over a long period of time. Furthermore, the filter and throttle units 10 can be expanded and replaced in a simple manner, since they are easily accessible and easy to assemble and disassemble. Different desired back pressures can also be set by filter and throttle units 10 with different opening widths.
Es sollte deutlich sein, dass der Schutzbereich nicht auf das beschriebene Ausführungsbeispiel beschränkt ist, sondern verschiedene Modifikationen denkbar sind. So kann der Scrollkompressor einen beliebigen Antrieb aufweisen oder die Gehäuseteilungen verändert werden. Auch kann die Filter- und Drosseleinheit anders in den Einlassöffnungen befestigt werden als durch Einpressen. It should be clear that the scope of protection is not limited to the embodiment described, but various modifications are conceivable. The scroll compressor can have any drive or the housing divisions can be changed. Also, the filter and throttle assembly can be secured in the intake ports in a manner other than press fitting.

Claims

Pierburg GmbH, 41460 Neuss P A T E N T A N S P R Ü C H E Pierburg GmbH, 41460 Neuss PATENT CLAIMS
1. Filter- und Drosseleinheit (10) für einen Scrollkompressor (26) mit einem Gehäuse (12) mit Gehäusewänden (14, 16), einer als Drossel dienenden Öffnung (18), die in einer der Gehäusewände (14, 16) ausgebildet ist, dadurch gekennzeichnet, dass innerhalb der Gehäusewände (14, 16) des Gehäuses (12) ein Filterelement (24) angeordnet ist. 1. Filter and throttle unit (10) for a scroll compressor (26) with a housing (12) with housing walls (14, 16), serving as a throttle opening (18) which is formed in one of the housing walls (14, 16). , characterized in that a filter element (24) is arranged within the housing walls (14, 16) of the housing (12).
2. Filter- und Drosseleinheit für einen Scrollkompressor nach Anspruch 1, dadurch gekennzeichnet, dass das Gehäuse (12) eine axial begrenzende Gehäusewand (14), in der die als Drossel oder Blende dienende Öffnung (18) ausgebildet ist, und eine ringförmige, radial begrenzende Gehäusewand (16) aufweist, die sich von der axial begrenzenden Gehäusewand (14) aus axial erstreckt. 2. Filter and throttle unit for a scroll compressor according to claim 1, characterized in that the housing (12) has an axially delimiting housing wall (14) in which the opening (18) serving as a throttle or diaphragm is formed, and an annular, radially defining housing wall (16) which extends axially from the axially defining housing wall (14).
3. Filter- und Drosseleinheit für einen Scrollkompressor nach einem der Ansprüche 1 oder 2, dadurch gekennzeichnet, dass das Filterelement (24) plattenförmig ausgeführt ist und die Filter- und Drosseleinheit (10) zu einer axialen Seite begrenzt. 3. Filter and throttle unit for a scroll compressor according to one of claims 1 or 2, characterized in that the filter element (24) is plate-shaped and the filter and throttle unit (10) is limited to an axial side.
4. Filter- und Drosseleinheit für einen Scrollkompressor nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass das Filterelement (24) als Filtersieb ausgebildet ist, welches radial durch ein Dichtelement (20) begrenzt ist, welches im Gehäuse (12) befestigt ist. Filter- und Drosseleinheit für einen Scrollkompressor nach Anspruch 4, dadurch gekennzeichnet, dass das Gehäuse (12) als Stanzteil ausgebildet ist, in dem das Filterelement (24) über das Dichtelement (20) formschlüssig befestigt ist. Filter- und Drosseleinheit für einen Scrollkompressor nach Anspruch 5, dadurch gekennzeichnet, dass das Dichtelement (20) mit einer ersten axialen Seite gegen die axial begrenzende Gehäusewand (14) anliegt und mit seiner entgegengesetzten axialen Seite gegen einen sich zumindest teilweise nach radial innen erstreckenden Kragen (22) der radial begrenzenden Gehäusewand (16) anliegt. Filter- und Drosseleinheit für einen Scrollkompressor nach Anspruch 6, dadurch gekennzeichnet, dass das Dichtelement (20) zwischen dem Kragen (22) und der axial begrenzenden Gehäusewand (16) axial verpresst ist. Filter- und Drosseleinheit für einen Scrollkompressor nach einem der Ansprüche 4 bis 7, dadurch gekennzeichnet, dass das Filterelement (24) radial außen mit einem Kunststoff des Dichtelementes (20) umspritzt ist. Scrollkompressor (26) für einen Kältemittelkreislauf mit einem Antrieb (34), einer mittels des Antriebs (34) antreibbaren Exzentereinheit (72), über die eine orbitierende Verdrängerspirale (78) bewegbar ist, welche in eine feststehende Statorspirale (80) greift, zumindest einem Verdrängerraum (86) zwischen der Statorspirale (80) und der Verdrängerspirale (78), einer Hochdruckkammer (92), in die der zumindest eine4. Filter and throttle unit for a scroll compressor according to one of the preceding claims, characterized in that the filter element (24) is designed as a filter screen, which is limited radially by a sealing element (20) which is fixed in the housing (12). Filter and throttle unit for a scroll compressor according to Claim 4, characterized in that the housing (12) is designed as a stamped part in which the filter element (24) is positively fastened via the sealing element (20). Filter and throttle unit for a scroll compressor according to Claim 5, characterized in that the sealing element (20) rests with a first axial side against the axially delimiting housing wall (14) and with its opposite axial side against a collar which at least partially extends radially inwards (22) rests against the radially delimiting housing wall (16). Filter and throttle unit for a scroll compressor according to Claim 6, characterized in that the sealing element (20) is pressed axially between the collar (22) and the axially limiting housing wall (16). Filter and throttle unit for a scroll compressor according to one of Claims 4 to 7, characterized in that the filter element (24) is overmoulded radially on the outside with a plastic of the sealing element (20). Scroll compressor (26) for a refrigerant circuit with a drive (34), an eccentric unit (72) that can be driven by the drive (34) and via which an orbiting displacement spiral (78) can be moved, which engages in a fixed stator spiral (80), at least one displacement space (86) between the stator spiral (80) and the displacement spiral (78), a high-pressure chamber (92) into which the at least one
Verdrängerraum (86) mündet, einer Niederdruckkammer (88), die in den zumindest einen Verdrängerraum (86) mündet, einem Ölrückführungskanal (114), über den die Hochdruckkammer (92) mit der Niederdruckkammer (88) fluidisch verbunden ist, einer Gegendruckkammer (60), die an der von der Statorspirale (80) abgewandten Seite der Verdrängerspirale (78) ausgebildet ist, einem Gasverbindungskanal (118), über den die Gegendruckkammer (60) mit der Hochdruckkammer (92) fluidisch verbunden ist, dadurch gekennzeichnet, dass im Gasverbindungskanal (118) und/ oder im Ölrückführungskanal (114) eine Filter- und Drosseleinheit (10) gemäß einem der vorhergehenden Ansprüche angeordnet ist. Scrollkompressor für einen Kältemittelkreislauf nach Anspruch 9, dadurch gekennzeichnet, dass sich der Gasverbindungskanal (118) und/oder der Ölrückführungskanal (114) zumindest abschnittsweise durch die Statorspirale (80) erstrecken. Scrollkompressor für einen Kältemittelkreislauf nach Anspruch 10, dadurch gekennzeichnet, dass die Filter- und Drosseleinheit (10) in der Statorspirale (80) befestigt ist. Scrollkompressor für einen Kältemittelkreislauf nach Anspruch 11, dadurch gekennzeichnet, dass die Filter- und Drosseleinheit (10) in einer Einlassöffnung (116, 120) an einer Deckscheibe (91) der Statorspirale (80) eingepresst ist, wobei das Filterelement (24) plattenförmig ausgebildet ist und die Hochdruckkammer (92) begrenzt. Scrollkompressor für einen Kältemittelkreislauf nach einem der Ansprüche 9 bis 12, dadurch gekennzeichnet, dass der Gasverbindungskanal (118) sich von der Hochdruckkammer (92) durch die Statorspirale (80) und ein Lagergehäuseteil (54) zur Gegendruckkammer (60) erstreckt. Scrollkompressor für einen Kältemittelkreislauf nach einem der Ansprüche 9 bis 13, dadurch gekennzeichnet, dass die Hochdruckkammer (92) mit einer Ölabscheidekammer (106) verbunden ist, in welcher ein Ölabscheider (108) angeordnet ist. Scrollkompressor für einen Kältemittelkreislauf nach einem der Ansprüche 9 bis 14, dadurch gekennzeichnet, dass der Ölrückführungskanal (114) sich ausgehend von einem tiefsten Punkt der Ölabscheidekammer (106) durch ein Kopfgehäuseteil (32), die Statorspirale (80) und das Lagergehäuseteil (54) zur Niederdruckkammer (88) erstreckt. Scrollkompressor für einen Kältemittelkreislauf nach einem der Ansprüche 9 bis 15, dadurch gekennzeichnet, dass die Einlassöffnung (120) des Gasverbindungskanals (118) in Strömungsrichtung des Gases vor dem Ölabscheider (108) angeordnet ist. displacement chamber (86), a low-pressure chamber (88) which opens into the at least one displacement chamber (86), an oil return channel (114) via which the high-pressure chamber (92) is fluidically connected to the low-pressure chamber (88), a counter-pressure chamber (60 ), which is formed on the side of the displacer spiral (78) facing away from the stator spiral (80), a gas connection channel (118) via which the counter-pressure chamber (60) is fluidically connected to the high-pressure chamber (92), characterized in that in the gas connection channel (118) and/or a filter and throttle unit (10) according to one of the preceding claims is arranged in the oil return channel (114). Scroll compressor for a refrigerant circuit according to claim 9, characterized in that the gas connection channel (118) and/or the oil return channel (114) extend at least in sections through the stator spiral (80). Scroll compressor for a refrigeration cycle according to claim 10, characterized in that the filter and throttling unit (10) is fixed in the stator scroll (80). Scroll compressor for a refrigerant circuit according to Claim 11, characterized in that the filter and throttle unit (10) is pressed into an inlet opening (116, 120) on a cover plate (91) of the stator spiral (80), the filter element (24) being plate-shaped and the high-pressure chamber (92) is limited. Scroll compressor for a refrigeration cycle according to any one of claims 9 to 12, characterized in that the gas connection channel (118) extends from the high pressure chamber (92) through the stator scroll (80) and a bearing housing part (54) to the back pressure chamber (60). A scroll compressor for a refrigeration cycle according to any one of claims 9 to 13, characterized in that the high pressure chamber (92) is connected to an oil separation chamber (106) in which an oil separator (108) is arranged. Scroll compressor for a refrigerant circuit according to one of Claims 9 to 14, characterized in that the oil return channel (114), starting from a lowest point of the oil separation chamber (106), extends through a head housing part (32), the stator spiral (80) and the bearing housing part (54) extends to the low pressure chamber (88). A scroll compressor for a refrigeration cycle according to any one of claims 9 to 15, characterized in that the inlet port (120) of the gas communication passage (118) is located in front of the oil separator (108) in the flow direction of the gas.
EP20789083.1A 2020-10-08 2020-10-08 Filter-and-throttle unit for a scroll compressor, and scroll compressor for a refrigerant circuit Pending EP4226044A1 (en)

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