EP4341564A1 - Elektrischer spiralverdichter - Google Patents
Elektrischer spiralverdichterInfo
- Publication number
- EP4341564A1 EP4341564A1 EP21728860.4A EP21728860A EP4341564A1 EP 4341564 A1 EP4341564 A1 EP 4341564A1 EP 21728860 A EP21728860 A EP 21728860A EP 4341564 A1 EP4341564 A1 EP 4341564A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- rotor
- pressure chamber
- balancing weight
- compressor
- radially
- 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.)
- Granted
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
- 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
- F04C23/00—Combinations of two or more pumps, each being of rotary-piston or oscillating-piston type, specially adapted for elastic fluids; Pumping installations specially adapted for elastic fluids; Multi-stage pumps specially adapted for elastic fluids
- F04C23/008—Hermetic pumps
-
- 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
- F04C29/0042—Driving elements, brakes, couplings, transmissions specially adapted for pumps
- F04C29/0085—Prime movers
-
- 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
- F04C2240/40—Electric motor
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C2240/00—Components
- F04C2240/80—Other components
- F04C2240/807—Balance weight, counterweight
Definitions
- the invention relates to an electric scroll compressor with a compressor housing, which has a compressor inlet and a
- Compressor outlet a compressor unit which has a driven eccentric unit, a fixed scroll and an orbiting displacement scroll which is arranged on the eccentric unit and engages in the fixed scroll, an electric motor which has a fixed stator and a rotating rotor, the eccentric unit on the rotor is fixed, and wherein at least one balancing weight is arranged on the rotor, and one
- High-pressure chamber which is fluidly arranged between the compressor outlet and the compressor unit.
- Such electric scroll compressors are well known from the prior art, for example from DE 10 2018 110 025 B4, and include a compressor housing, a compressor unit and an electric motor, the compressor unit and the electric motor being arranged in the compressor housing.
- the compressor housing has a compressor inlet and a compressor outlet, with a fluid flowing through the compressor inlet into a low-pressure chamber, flowing through the compressor unit and finally flowing out of the compressor, starting from a high-pressure chamber, via the compressor outlet.
- the compressor unit comprises an orbiting displacer scroll and a fixed scroll which interacts with the displacer scroll and is attached to the compressor housing.
- the displacement scroll is driven by an electric motor, which has a stator attached to the compressor housing and a rotor which is rotatably mounted on the compressor housing via two bearing elements having.
- the rotor drives the displacement scroll via an eccentric unit, which results in the orbiting movement of the displacement scroll.
- the masses to be moved and in particular the gas forces that vary depending on the operating point cause a dynamic imbalance in the rotor, which results in vibrations, unwanted noise and increased loads on the bearing elements that rotatably mount the rotor.
- dynamic imbalances arise because the axis of rotation does not coincide with one of the main axes of inertia of the component, but is tilted at the center of gravity in relation to the main axes of inertia. This creates bending moments, so-called imbalance moments on the axis of rotation, which cause circular vibrations at the ends of the rotating body that are displaced by 180 degrees and thus cause the body to wobble.
- the electric motor has a balancing weight on each of its end faces.
- the balancing weights are usually designed and positioned in such a way that the dynamic imbalance is compensated for.
- the balancing weights can be dimensioned and arranged in such a way that only the dynamic imbalance caused by the moving masses is compensated. Otherwise, the balancing weights can be designed and arranged in such a way that the dynamic imbalance caused by the gas forces is also compensated, with a predefined operating point, ie at a predefined suction pressure, ie at a pressure at the compressor inlet, and a predefined high pressure, ie a pressure at the compressor outlet , the dynamic imbalance is balanced as best as possible.
- the electric scroll compressor is usually operated at different operating points, i.e. with different suction and/or high pressures, so that the balancing weights in the operating points that deviate from the predefined operating point do not have the same effect with regard to vibrations, unwanted noise development and the loads on the bearing elements can unfold as in the design point, ie in the predefined operating point, and/or possibly even increase the dynamic imbalance.
- the task therefore arises of further developing an electric scroll compressor in such a way that the electric scroll compressor has reduced vibration and noise development during operation at different operating points and a reduced load on the bearing elements supporting the rotor.
- the balancing weight is arranged on the rotor in a radially displaceable manner and the rotor has a rotor pressure chamber which is delimited at least radially by the balancing weight and is fluidically connected to the high-pressure chamber, the balancing weight being radially positionable as a function of a pressure prevailing in the rotor pressure chamber , the dynamic imbalance is compensated for depending on the temporary operating point. In this way, in particular, the portion of the dynamic imbalance caused by the gas forces occurring in the compression process and dependent on the operating point can be compensated.
- the high pressure and the suction pressure varies, whereby the The load on the compressor unit and rotor caused by high pressure and suction pressure varies.
- the variation of the load usually causes a tilting of the main axis of inertia of the rotor, which is dependent on the operating point, relative to the axis of rotation defined by the bearing elements, and thus a dynamic imbalance that is dependent on the operating point. Because the radial position of the balancing weight depends on the high pressure and thus on the operating point, tilting of the main axis of inertia of the rotor relative to the axis of rotation is counteracted at all operating points. This reduces the dynamic imbalance for each individual operating point.
- one is adjacent to the displacer scroll
- Back-pressure chamber is provided, which is fluidically connected to the high-pressure chamber via a gas connection channel, wherein the rotor pressure chamber is fluidically connected to the high-pressure chamber via the back-pressure chamber.
- the back pressure chamber is delimited by the compressor housing and the displacement scroll and serves to seal between the two scrolls. 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 axially against the stationary scroll.
- the counter-pressure chamber is directly adjacent to the rotor, i.e. it is arranged on the side of the compressor unit facing the electric motor, so that a fluidic connection between the rotor pressure chamber and the counter-pressure chamber can be implemented in a simple manner and by minor modifications to the volute housing.
- the rotor pressure chamber is fluidically connected to the counter-pressure chamber via a gas duct, the gas duct being formed in the rotor.
- the counter-pressure chamber is arranged on the axial side of the displacement volute facing away from the fixed volute and is directly adjacent to the rotor. through the connection the rotor pressure chamber with the counter-pressure chamber, the rotor pressure chamber can be supplied with the pressurized gas simply and inexpensively by a single gas duct formed on the rotor, for example on a rotor shaft.
- the balancing weight is preferably arranged on an axial end face of the rotor. This allows the balancing weight to be easily mounted on the rotor.
- the balancing weight is arranged in a basic radial position by means of a pretensioned spring element and is arranged in at least one radial pressure position depending on the pressure prevailing in the rotor basic chamber.
- the spring element is designed in such a way that the balance weight is held in a predefined basic radial position, the balance weight being pressed against a stop, for example by the spring element. In this basic radial position, the balancing weight is used to compensate for the dynamic imbalance at a predefined operating point, for example the operating point with the lowest initial or web pressure.
- a pressure prevailing in the rotor pressure chamber which depends on the high pressure or corresponds to the high pressure, leads to a radial displacement of the balancing weight, the dynamic imbalance changed by the high pressure being compensated for by the radial displacement of the balancing weight. This balances the rotor at different operating points.
- a rotor pressure chamber element is provided with a bottom, a top and a plurality of side walls, which is arranged on an axial end face of the rotor, with the balancing weight being guided radially through the side walls.
- the rotor pressure chamber element partially delimits the rotor pressure chamber with the ceiling and the side walls.
- the balancing weight Within an interior of Rotor pressure chamber element is arranged the balancing weight, which also limits the rotor pressure chamber and fluid-tight against the side walls.
- a radial force acts on the balancing weight, which results from the pressure prevailing in the rotor pressure chamber and the effective area.
- the rotor pressure chamber element which is separate and can be mounted on an end face of the rotor, can be mounted on the rotor in a simple and cost-effective manner.
- the spring element is preferably a compression spring, which is arranged between the balancing weight and the floor, or a tension spring, which is arranged between the ceiling and the balancing weight, such that the balancing weight is loaded radially inward by the compression spring or the tension spring.
- a compression spring which is arranged between the balancing weight and the floor
- a tension spring which is arranged between the ceiling and the balancing weight, such that the balancing weight is loaded radially inward by the compression spring or the tension spring.
- a first balancing weight and a second balancing weight are preferably provided, with a first balancing element being arranged on a first axial end face of the rotor and a second balancing element being arranged on a second axial end face opposite the first end face, with both balancing weights being arranged on the rotor in a radially displaceable manner are adjacent to a respective rotor pressure chamber and can be radially positioned as a function of a pressure prevailing in the respective rotor pressure chamber.
- the dynamic imbalance can be reliably reduced.
- An electric scroll compressor is thus created which, at different operating points, has a reduced development of vibration and noise and a reduced load on the bearing elements supporting the rotor.
- FIG. 1 An embodiment of an electric scroll compressor according to the invention is shown in the figure and described below.
- the figure shows a sectional view of a scroll compressor according to the invention.
- the scroll compressor 2 includes a compressor housing 10 which delimits an engine compartment 18 and a compressor compartment 20 .
- An electric motor 22 with a stator 24 and a rotor 26 is arranged in the engine compartment 18 .
- the rotor 26 is fixed on a rotor shaft 28 .
- the rotor shaft 28 extends through a central opening 29 into the compressor compartment 20.
- the rotor shaft 28 is mounted in two shaft bearings 40, 42 via two end shaft bearing sections 30, 34 so as to be rotatable about a rotor shaft axis of rotation.
- the shaft sealing ring 43 fluidly seals the engine compartment 18 from a counter-pressure chamber 69 of the compressor compartment 20 .
- a compressor unit 58 is arranged in the compressor chamber 20 and has an orbiting displacement scroll 60 and a stationary scroll 62 .
- the orbiting displacement scroll 60 is arranged via an eccentric shaft bearing 64 on an eccentric unit 50 fastened to the rotor shaft 28 and rests via a sliding disk 71 on a surface on the compressor housing 10 facing the compressor chamber 20 .
- the fixed scroll 62 is fixedly disposed within the compressor housing 10 .
- the orbiting displacer scroll 60 and the fixed scroll 62 are designed in such a way that they delimit a compression chamber 63 and, through the orbiting movement of the displacer scroll 60, convey a refrigerant from a radially outer inlet 66 of the compression chamber 63 to a radially inner outlet 67 of the compression chamber 63 and at the same time is compressed.
- the compressor chamber 20 has a high-pressure chamber 68 and a counter-pressure chamber 69 .
- the high-pressure chamber 68 is delimited by the compressor housing 10 and by the fixed scroll 62 and is arranged fluidly between the outlet 67 and a compressor outlet 6 , with the refrigerant flowing from the outlet 67 via the high-pressure chamber 68 to the compressor outlet 6 . Starting from the compressor outlet 6, the refrigerant flows into a coolant circuit of a motor vehicle.
- the back pressure chamber 69 is delimited by the compressor housing 10 and the orbiting displacement scroll 60 .
- the counter-pressure chamber 69 is fluidically connected to the high-pressure chamber 68 via a gas connection channel 70 .
- the gas connection channel 70 runs from the high-pressure chamber 68 through the fixed scroll 62 and through the compressor housing 10.
- the pressure prevailing in the counter-pressure chamber 69 acts on the axially displaceable, orbiting displacement scroll 60, from which an axial load on the displacement scroll 60 results.
- This axial loading results in an improved seal between the faces of the displacer orbiting volute 60 and the fixed volute 62.
- the masses to be moved and in particular those that vary depending on the operating point cause Gas forces cause a dynamic imbalance in the rotor 26, which results in vibrations, unwanted noise and increased loads on the shaft bearings 40, 42 that rotatably mount the rotor 26.
- the rotor 26 has a radially displaceable balancing weight 72, 74 and a rotor pressure chamber element 76, 78 at each of its axial ends.
- the rotor pressure chamber elements 76, 78 each have several
- Rotor pressure chamber elements 76, 78 are guided in such a way that the balancing weights 72, 74 are radially movable.
- the balancing weights 72, 74 are each loaded in the radial direction, i.e. radially inward, by a spring element 84, 86 which is arranged between the cover of the rotor pressure chamber elements 76, 78 and the balancing weights 72, 74 and is designed as a compression spring.
- a rotor pressure chamber 88 , 90 is provided on the side of the balancing weights 72 , 74 opposite the spring element 84 , 86 .
- the rotor pressure chambers 88, 90 are each through the balance weight 72, 74, the side walls of
- Rotor pressure chamber element 76, 78 limited.
- the rotor pressure chambers 88, 90 are fluidically connected to the counter-pressure chamber 69 via a gas duct 92, so that a pressure dependent on the pressure of the counter-pressure chamber 69 prevails in the rotor pressure chambers 88, 90.
- the pressure prevailing in the rotor pressure chambers 88, 90 loads the
- Balancing weights 72, 74 radially and against the spring force of the spring elements 84, 86.
- the balancing weights 72, 74 are displaced radially depending on the pressure prevailing in the rotor pressure chambers 88, 90 and thus on the operating pressure of the scroll compressor 2.
- the dynamic imbalance is compensated for by the radially moving balancing weights 72 , 74 as a function of the temporarily present operating point, ie the pressure prevailing in the high-pressure chamber 68 .
- the balancing weight 72, 74 is loaded at a predefined operating point by the spring element 84, 86 into a basic radial position, with the balancing weights 72, 74 being pressed radially against a stop.
- the balancing weights 72, 74 shift into at least one radial pressure position.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Rotary Pumps (AREA)
- Applications Or Details Of Rotary Compressors (AREA)
Abstract
Description
Claims
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/EP2021/063547 WO2022242867A1 (de) | 2021-05-20 | 2021-05-20 | Elektrischer spiralverdichter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP4341564A1 true EP4341564A1 (de) | 2024-03-27 |
| EP4341564B1 EP4341564B1 (de) | 2025-05-07 |
Family
ID=76197429
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP21728860.4A Active EP4341564B1 (de) | 2021-05-20 | 2021-05-20 | Elektrischer spiralverdichter |
Country Status (2)
| Country | Link |
|---|---|
| EP (1) | EP4341564B1 (de) |
| WO (1) | WO2022242867A1 (de) |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6213789A (ja) * | 1985-07-12 | 1987-01-22 | Hitachi Ltd | スクロ−ル圧縮機 |
| JPH10205466A (ja) * | 1997-01-23 | 1998-08-04 | Mitsubishi Heavy Ind Ltd | スクロール型流体機械 |
| US6305914B1 (en) * | 2000-03-27 | 2001-10-23 | Scroll Technologies | Counterweight of reduced size |
| DE102018110025B4 (de) | 2018-04-26 | 2020-06-04 | OET GmbH | Verdrängermaschine |
| CN210053294U (zh) * | 2019-07-24 | 2020-02-11 | 丹佛斯(天津)有限公司 | 用于压缩机的平衡块、用于压缩机的电机和压缩机 |
-
2021
- 2021-05-20 WO PCT/EP2021/063547 patent/WO2022242867A1/de not_active Ceased
- 2021-05-20 EP EP21728860.4A patent/EP4341564B1/de active Active
Also Published As
| Publication number | Publication date |
|---|---|
| WO2022242867A1 (de) | 2022-11-24 |
| EP4341564B1 (de) | 2025-05-07 |
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