EP4062067A1 - Spiralverdichter - Google Patents
SpiralverdichterInfo
- Publication number
- EP4062067A1 EP4062067A1 EP19805654.1A EP19805654A EP4062067A1 EP 4062067 A1 EP4062067 A1 EP 4062067A1 EP 19805654 A EP19805654 A EP 19805654A EP 4062067 A1 EP4062067 A1 EP 4062067A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- pressure chamber
- scroll compressor
- spiral
- compressor according
- venturi nozzle
- 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
- 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
- F04C18/0246—Details concerning the involute wraps or their base, e.g. geometry
- F04C18/0253—Details concerning the base
-
- 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
- F04C29/0021—Systems for the equilibration of forces acting on the pump
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- 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
Definitions
- the invention relates to a scroll compressor with a high-pressure chamber and a low-pressure chamber, an orbiting displacement spiral which is arranged on a driven eccentric unit and engages in a stationary spiral, the displacement spiral and the stationary spiral delimiting a compression chamber, and a counter-pressure chamber adjoining the displacement spiral, which over a gas connection channel is fluidically connected to the high-pressure chamber and is fluidically connected to the compression chamber via a fluid passage provided on the displacement spiral.
- Such scroll compressors are sufficiently known from the prior art, for example from DE 10 2017 105 175 B3, and comprise a high pressure chamber, a low pressure chamber and an orbiting displacement spiral.
- the orbiting displacement spiral engages in a stationary spiral in such a way that a compression chamber is formed between the displacement spiral and the stationary spiral.
- a counter-pressure chamber is provided between the low-pressure chamber and the displacement spiral, a pressure prevailing in the counter-pressure chamber which acts on the orbiting displacement spiral.
- the pressure prevailing in the counterpressure chamber and acting on the displacement spiral causes a resulting force in the axial direction, whereby the at least slightly axially movable displacement spiral is pressed against the stationary spiral and the spirals are thus sealed off from one another.
- the pressure prevailing in the counter-pressure chamber is set in such a way that the counter-pressure chamber is connected to the
- the high-pressure chamber is fluidically connected and is fluidically connected to the compression chamber via a fluid passage which is provided on the orbiting displacement spiral. Because the counter-pressure chamber is fluidically connected to the high-pressure chamber and the compression chamber, the pressure prevailing in the counter-pressure chamber is set as a function of the pressure prevailing in the compression chamber. In this way, a contact pressure required for the tightness of the arrangement between the displacement spiral and the stationary spiral can be set depending on the pressure acting in the compression chamber, thereby avoiding an excessively high contact pressure, which would lead to a loss of performance of the scroll compressor.
- a lubricating oil is added to the fluid to be compressed.
- the fluid-oil mixture is also present after compression and is conveyed into the counter-pressure chamber via the gas connection channel.
- the disadvantage here is that the oil collects in the counterpressure chamber and too high an oil content in the counterpressure chamber results in an undesirable change in pressure in the
- a change in pressure leads to a leak between the displacement scroll and the stationary scroll, which reduces the efficiency of the scroll compressor.
- the object is therefore to provide a scroll compressor with a back pressure chamber which can be operated reliably with a high degree of efficiency.
- a scroll compressor with the features of main claim 1.
- a Venturi nozzle is provided in the fluid passage, which has at least one transverse opening at its constriction, the transverse opening being fluidically connected to the counter-pressure chamber, so that a suction jet pump is created, an oil suction from the counter-pressure chamber is effected, whereby a through a An undesirable pressure change in the back pressure chamber caused by an excessively high oil content can be reliably prevented and a reduction in the efficiency of the scroll compressor can be reliably prevented.
- the oil is sucked out of the back pressure chamber in that the fluid flow flowing through the fluid passage is accelerated by the narrowing of the Venturi nozzle, the increase in flow velocity leading to an increase in the dynamic pressure and a reduction in the static pressure.
- the reduced static pressure and the resulting negative pressure in relation to the counterpressure chamber causes the oil that has accumulated in the counterpressure chamber to flow from the counterpressure chamber through the transverse opening into the Venturi nozzle.
- the oil is entrained by the fluid flow between the back pressure chamber and the compression chamber and is blown into the compression chamber. Starting from the compression chamber, the fluid flows into the floch pressure chamber.
- the transverse opening is fluidically connected to the counter-pressure chamber via a flow channel, the flow channel being provided on the displacement spiral.
- the flow channel preferably opens into the counter-pressure chamber at the lowest point of the displacement spiral.
- the Venturi nozzle has several transverse openings, which are arranged distributed over the circumference, whereby the oil sucked out of the counter-pressure chamber is uniform Fluid flow channel can be fed to the Venturi nozzle and can be entrained in this.
- the Venturi nozzle preferably has an annular groove on the outer circumferential surface, the annular groove being fluidically connected to the transverse bores.
- the annular groove together with a circumferential surface of the displacement spiral adjoining the Venturi nozzle, delimits an annular channel through which the extracted oil can flow reliably and evenly to all cross bores
- the fluid passage is preferably arranged in a web area of the displacement spiral.
- the web area is provided on the side facing away from the stationary scroll and between two adjacent guide openings, a guide pin fastened to the compressor housing engaging in each of the guide openings.
- the orbiting displacement spiral is guided by the guide pins engaging in the guide openings and rotation of the displacement spiral is prevented.
- other recesses can also be provided on the displacement spiral, which are separated from one another by a web.
- the Venturi nozzle has a certain length, and the arrangement of the fluid passage in the web area means that the Venturi nozzle can be arranged completely within the displacement spiral. Furthermore, the web area can be thickened in order to have sufficient strength of the web area in spite of the fluid passage.
- the Venturi nozzle is preferably pressed into the passage, as a result of which the Venturi nozzle can be fastened to the displacement spiral inexpensively, quickly and reliably.
- the fluid passage has two mutually adjoining axial sections, the axial sections have mutually different diameters, the Venturi nozzle resting on the end face on a radial shoulder between the two axial sections.
- the Venturi nozzle can easily be inserted with an insertion depth predefined by the depth of the axial section. This facilitates assembly in that the Venturi nozzle can be pushed in until it rests against the radial shoulder.
- the transverse opening preferably has a diameter of 0.5 to 1.0 mm. At least the transverse opening is preferably produced by a laser process. The transverse opening with a relatively small diameter can be produced in a simple and reliable manner by the laser method.
- An inlet of the gas connection channel is preferably arranged upstream of an oil separator in the direction of flow of a compressed fluid.
- the oil separator is used to separate the lubricating oil from the fluid entering a cooling circuit.
- the high-pressure chamber is preferably fluidically connected to the low-pressure chamber via an oil return channel.
- the oil guide channel serves to return the lubricating oil dissolved from the fluid, the oil being separated from the gas by the oil separator.
- the separated oil collects at the lowest point in the high-pressure chamber, the oil return channel extending from the lowest point of the high-pressure chamber to the low-pressure chamber.
- a throttle is provided in the oil return channel, which controls the oil return flow to the low-pressure chamber.
- a scroll compressor which has a back pressure chamber fluidically connected to the compression chamber via the gas connection channel with the high pressure chamber and via a fluid passage provided on the displacement spiral, an accumulation of oil in the back pressure chamber being prevented by a Venturi nozzle arranged in the fluid passage by the Venturi nozzle, based on the principle of a suction jet pump, causes the oil to be sucked out of the counter-pressure chamber.
- An embodiment of a scroll compressor according to the invention is shown in the figures and described below.
- Figure 1 shows a sectional view of a scroll compressor according to the invention
- FIG. 2 shows a section of the scroll compressor from FIG. 1,
- FIG. 3 shows a top view of a displacement spiral of the scroll compressor from FIG. 1.
- FIG. 1 shows a scroll compressor 2.
- the scroll compressor 2 comprises a multi-part compressor housing 10 with a first compressor housing part 12, a second compressor housing part 14 axially adjoining the first compressor housing part 12, and a third compressor housing part 16 adjoining the second compressor housing part 14 , the second compressor housing part 14 and the third compressor housing part 16 delimit an engine compartment 18.
- the second compressor housing part 14 and the third compressor housing part 16 delimit a compressor space 20.
- An electric motor 22 with a stator 24 and a rotor 26 is arranged in the engine compartment 18.
- the rotor 26 is fastened on a rotor shaft 28.
- the rotor shaft 28 extends from the engine compartment 18 through a central opening 29 of the second compressor housing part 14 into the compressor chamber 20.
- the rotor shaft 28 is mounted in two shaft bearings 40, 42 via two shaft bearing sections 30, 34 at the end so that it can rotate about a rotor shaft axis of rotation.
- the first shaft bearing 40 is arranged in the engine compartment 18 and supports the first shaft bearing section 30.
- the second shaft bearing 42 is arranged in the compressor chamber 20 and supports the second shaft bearing section 34.
- a shaft sealing ring 43 is provided on the side of the second shaft bearing 42 facing the engine compartment 18 , which rests on the radial inside against the rotor shaft 28 and is supported on the radial outside by the second compressor housing part 14.
- the shaft sealing ring 43 fluidically seals the engine compartment 18 from the compressor compartment 20.
- a compression unit 58 is arranged, which has an orbiting displacement spiral 60 and a stationary spiral 62, the orbiting displacement spiral 60 and the stationary spiral 62 delimiting a compression chamber 61.
- the orbiting displacement spiral 60 is arranged via an eccentric shaft bearing 64 on an eccentric unit 50 fastened to the rotor shaft 28.
- the fixed scroll 62 is fixedly arranged in the compressor housing 10, the fixed scroll 62 being axially supported by the second compressor housing part 14 and the third compressor housing part 16.
- the refrigerant is introduced through a compressor inlet 85 into the engine compartment 18 of the scroll compressor 2, the refrigerant flowing through the engine compartment 18 into the compressor compartment 20 and the compression chamber 61.
- the orbiting displacement spiral 60 and the fixed spiral 62 are designed in such a way that the orbiting movement of the displacement spiral 60 a refrigerant is conveyed from a radially outer inlet 66 of the compression chamber 61 to a radially inner outlet 68 of the compression chamber 61 and is compressed in the process.
- the compression chamber 20 has a high pressure chamber 80 and a counter pressure chamber 82.
- the high-pressure chamber 80 is delimited by the third compressor housing part 16 and by the stationary spiral 62 and is fluidly arranged between the outlet 68 and a compressor outlet 84, the refrigerant flowing from the outlet 68 via the high-pressure chamber 80 to the compressor outlet 84. Starting from the compressor outlet 84, the refrigerant flows into a coolant circuit of a motor vehicle.
- the high-pressure chamber 80 has an oil separation chamber 86 which is fluidly arranged directly in front of the compressor outlet 84 and which has an oil separator 88.
- the oil separator 88 is designed as a cyclone separator, the refrigerant flowing through the oil separator 88 to the compressor outlet 84 and the oil released from the refrigerant settling on the bottom of the oil separating chamber 86, ie at the lowest point of the high pressure chamber 80.
- an inlet 89 of an oil return duct 90 is provided at the bottom of the oil separation chamber 86, which fluidly connects the oil separation chamber 86 and thus the high pressure chamber 80 with a low pressure chamber 87, the engine compartment 18 forming the low pressure chamber 87.
- the oil return duct 90 extends through the third compressor housing part 16, the fixed spiral 62 and through the second compressor housing part 14, a filter 130 being arranged in the oil return duct 90.
- the back pressure chamber 82 is delimited by the second compressor housing part 14 and the orbiting displacement spiral 60, the pressure prevailing in the back pressure chamber 82 acting on the axially displaceable, orbiting displacement spiral 60 and exerting an axial load therefrom the displacement spiral results. This axial load leads to an improved seal between the end faces of the orbiting displacement scroll 60 and the stationary scroll 62.
- the counterpressure chamber 82 is fluidically connected to the high pressure chamber 80 via a gas connection channel 100.
- the gas connection channel 100 runs from the high-pressure chamber 80 through the fixed spiral 62 and through the second compressor housing part 14.
- the counter-pressure chamber 82 is fluidically connected to the compression chamber 61 via a fluid passage 70.
- a Venturi nozzle 71 is arranged in the fluid passage 70, the Venturi nozzle 71 having a plurality of transverse bores 741, 742 at its constriction 72, which are fluidically connected to the counter-pressure chamber 82 via a flow channel 78.
- the venturi nozzle 71 is shown in FIG.
- the transverse bores 741, 742 extend radially and are fluidically connected to one another via an annular channel 76 provided on the outer circumferential surface of the Venturi nozzle 71, the annular channel 76 being fluidically connected to the counter-pressure chamber 82 via the flow channel 78.
- the annular channel 76 is delimited by a circumferential annular groove 77 produced on the outer circumferential surface of the Venturi nozzle 71 and by a surface of the displacement spiral 60 resting on the outer circumferential surface. As shown in FIG.
- the venturi nozzle 71 is arranged in a thickened web area 114 on a side of the displacement spiral 60 facing away from the fixed spiral 62, the web area 114 being formed between two recesses 110, 112 provided on the displacement spiral 60.
- the circular recess 110 is a guide opening for guiding the displacement spiral 60 during operation of the scroll compressor 2, with a guide pin fastened to the compressor housing 10 engaging in each guide opening 110 and not shown in the figures.
- the fluid passage 70 having two axial sections 731, 732.
- the first axial section 731 has a diameter corresponding to the outer peripheral surface of the Venturi nozzle 71 and a length corresponding to the Venturi nozzle 71.
- the second axial section 732 has a smaller diameter compared to the first axial section 731, as a result of which a radially extending shoulder 79 is present between the two axial sections 731, 732.
- the Venturi nozzle 71 works on the principle of a suction jet pump and serves to discharge an oil from the counter-pressure chamber 82, the oil together with the fluid that is conveyed from the high-pressure chamber 80 into the counter-pressure chamber 82 via the gas connection channel 100 into the counter-pressure chamber 82 flows in and settles in the counter-pressure chamber 82. Too high a proportion of the oil leads to a reduction in the contact force between the displacement scroll 60 and the fixed scroll 62, as a result of which the efficiency of the scroll compressor 2 is impaired.
- the oil is discharged from the back pressure chamber 82 in that the fluid which occurs through the fluid passage 70 during operation of the scroll compressor 2 Mass flow is accelerated through the constriction 72 of the Venturi nozzle 71, as a result of which the static pressure in the area of the constriction 72 drops and a negative pressure relative to the counter-pressure chamber 82 arises.
- the negative pressure also prevails in the transverse bores 741, 742, the oil deposited on the bottom of the counterpressure chamber 82 flowing to the Venturi nozzle 71 through the negative pressure via the flow channel 78.
- the oil is entrained by the fluid flowing through the Venturi nozzle 71 and blown into the compression chamber 61. Starting from the compression chamber 61, the oil flows into the high-pressure chamber 80.
- a scroll compressor 2 is thus created which reliably prevents the oil from accumulating in the back pressure chamber 82. It should be clear that the scope of protection is not limited to the exemplary embodiment described, but that various modifications are conceivable.
- the compressor unit 58, the compressor housing 10 or the Venturi nozzle 71 can be designed differently.
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/EP2019/081644 WO2021098941A1 (de) | 2019-11-18 | 2019-11-18 | Spiralverdichter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP4062067A1 true EP4062067A1 (de) | 2022-09-28 |
| EP4062067B1 EP4062067B1 (de) | 2023-11-08 |
Family
ID=68610242
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP19805654.1A Active EP4062067B1 (de) | 2019-11-18 | 2019-11-18 | Spiralverdichter |
Country Status (2)
| Country | Link |
|---|---|
| EP (1) | EP4062067B1 (de) |
| WO (1) | WO2021098941A1 (de) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102024205286A1 (de) * | 2024-06-07 | 2025-12-11 | Brose Fahrzeugteile SE & Co. Kommanditgesellschaft, Würzburg | Scroll-Verdichter |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06193570A (ja) * | 1992-12-25 | 1994-07-12 | Hitachi Ltd | 密閉形スクロール圧縮機 |
| JP2003097457A (ja) * | 2001-09-19 | 2003-04-03 | Hitachi Ltd | スクロール圧縮機 |
| JP5272031B2 (ja) * | 2011-03-10 | 2013-08-28 | 日立アプライアンス株式会社 | スクロール圧縮機 |
| DE102017105175B3 (de) | 2017-03-10 | 2018-08-23 | OET GmbH | Verdrängermaschine nach dem Spiralprinzip, Verfahren zum Betreiben einer Verdrängermaschine, Verdrängerspirale, Fahrzeugklimaanlage und Fahrzeug |
| CN109185131A (zh) * | 2018-10-29 | 2019-01-11 | 珠海凌达压缩机有限公司 | 涡旋压缩机、空调及车辆 |
-
2019
- 2019-11-18 EP EP19805654.1A patent/EP4062067B1/de active Active
- 2019-11-18 WO PCT/EP2019/081644 patent/WO2021098941A1/de not_active Ceased
Also Published As
| Publication number | Publication date |
|---|---|
| WO2021098941A1 (de) | 2021-05-27 |
| EP4062067B1 (de) | 2023-11-08 |
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