EP4337860A1 - Radialkolbenpumpe, sowie verfahren zur herstellung einer radialkolbenpumpe - Google Patents
Radialkolbenpumpe, sowie verfahren zur herstellung einer radialkolbenpumpeInfo
- Publication number
- EP4337860A1 EP4337860A1 EP22727022.0A EP22727022A EP4337860A1 EP 4337860 A1 EP4337860 A1 EP 4337860A1 EP 22727022 A EP22727022 A EP 22727022A EP 4337860 A1 EP4337860 A1 EP 4337860A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- radial piston
- piston pump
- retaining ring
- pump according
- cover
- 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
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
- F04B1/04—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement
- F04B1/0404—Details or component parts
- F04B1/0421—Cylinders
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B17/00—Pumps characterised by combination with, or adaptation to, specific driving engines or motors
- F04B17/03—Pumps characterised by combination with, or adaptation to, specific driving engines or motors driven by electric motors
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
- F04B1/04—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement
- F04B1/0404—Details or component parts
Definitions
- the present invention relates to a radial piston pump, in particular a radial piston compressor, according to the preamble of claim 1, and a method for producing a radial piston pump according to the preamble of claim 20, 21, 22 and/or 23.
- a radial piston pump is an element of fluid technology.
- this pump which can also be referred to as a pump based on the radial piston principle
- the piston-working chamber combinations are arranged radially and perpendicularly to the drive shaft, in contrast to an axial piston compressor.
- the conveying or lifting movement of each individual working piston is caused by an eccentric located on the drive shaft.
- the radial piston pump comprises a plurality of piston/working chamber combinations which extend in a star shape and radially from the drive shaft.
- the radial piston pump pumps a fluid from a low-pressure space into a high-pressure space.
- Radial piston pumps are used, for example, as compressors for coolants in air conditioning systems in motor vehicles, in particular also in electrically driven motor vehicles.
- a radial piston pump can also be referred to as a radial piston compressor or refrigerant compressor based on the radial piston principle.
- the present invention relates to the improvement of a radial piston pump, in particular a refrigerant compressor based on the radial piston principle, the lifting function of which is transmitted to the pistons by means of circular eccentrics.
- the valves for the gas exchange process are preferably arranged as follows.
- the inlet valves are arranged radially with respect to the axis of rotation of the eccentric shaft, i.e. near the head side of the respective piston.
- the outlet valves are preferably arranged axially, which brings advantages in terms of installation space and increases the freedom of design for the inlet valves, in particular larger valve diameters, greater bending lengths, possibly several inlet valves, etc.
- a radial piston pump also includes a cover.
- the cover is designed, for example, as a preassembled subassembly and, in addition to the cover, includes a seal, an inlet valve plate with a reed valve and two fastening pins that hold the subassembly together.
- the intake valve in particular the valve plate with a reed valve, is located preferably at the bottom of a cylindrical recess above the working chamber on the pump body.
- the cover preferably with a seal, presses from the outside onto the valve plate against the collar of the cylindrical recess.
- the cover is fastened with screws, for example, i.e. there is one cover screw connection for each cylinder unit.
- the screw connection creates additional radial space and additional costs for parts and assembly.
- a radial piston pump having the characterizing features of claim 1. Because the radial piston pump is equipped with at least one retaining ring for fixing all the covers of the radial piston pump.
- the resulting advantages are in particular that only one component is required, which takes over the holding force of the lid.
- Another possible advantage is the elimination of cost-intensive processing such as drilling and thread cutting as well as additional assembly steps such as screwing for each cylinder.
- the radial piston pump comprises at least three, preferably six, piston/working chamber combinations, which are arranged in a star shape around the drive shaft.
- several piston-working chamber combinations can be driven by means of a drive shaft, in particular an eccentric shaft.
- the piston/working chamber combinations are accommodated in a pump base body.
- a correspondingly compact design of the radial piston pump can be implemented.
- the cover has a contact surface for the retaining ring.
- a defined contact surface can be matched to the inner surface of the retaining ring, in particular with regard to a suitable curvature and a corresponding adjustment to the diameter of the retaining ring, so that, for example, an advantageous form fit or a sufficient press fit can be achieved.
- the cover and/or the pump body has a contact collar for the retaining ring, the contact collar having in particular a radially extending surface as a stop for the retaining ring.
- the contact collar can serve as a stop for the retaining ring, on the one hand, for example, as a corresponding stop when assembling the retaining ring. Furthermore, it can be ensured, for example when the retaining ring is in full contact with the contact collar, that the cover or covers have the correct angular position.
- the radial piston pump has at least two retaining rings for fixing all the covers of the radial piston pump, with the retaining rings being arranged axially one behind the other.
- the cover is fixed in place by a single retaining ring.
- a press fit is provided between the retaining ring and the cover.
- the inside diameter of the retaining ring has an inside diameter according to tolerance class IT 7 or IT 8.
- the radial piston pump is equipped with a housing which is designed to accommodate at least sections of the pump base body, in particular the piston-working chamber combinations.
- the housing of the radial piston pump is formed from at least two housing components, in particular a high-pressure housing and/or a stator housing, in particular for accommodating a rotor and a stator of an electric motor.
- the retaining ring is integrated into the housing or at least one housing component.
- the housing components are screwed together, in particular that the housing components are screwed together by means of a screw.
- the basic pump body has a flange which is used for screwing to the housing and/or the other housing components.
- the housing components form fluid channels of the radial piston pump, or at least partial areas thereof.
- the housing component has plane-parallel axial sealing surfaces.
- the surfaces of the sealing surfaces of the housing component are equipped with concentric grooves, in particular with a ripple in the radial direction.
- seals are additionally or solely arranged between the sealing surfaces.
- the surfaces of the sealing surfaces have one or more geometric shapes that deviate from a flat or approximately flat surface.
- a further object of the present invention consists in proposing advantageous methods for producing a radial piston pump according to the invention.
- this object is achieved by a method according to claim 20, 21, 22 and/or 23.
- 1 shows a radial piston pump without a retaining ring in a sectional view
- 1a shows an enlarged view of a portion of a radial piston pump according to FIG
- lb is a plan view of a cover of a radial piston pump to illustrate its area
- Fig. 2 is a schematic representation of a piston-working space combination
- Fig. 2a exemplary arrangements of intake valve (s) and exhaust valve (in).
- Fig. 2b exemplary arrangements of intake valve(s) and exhaust valve(s) of a
- 3 shows a radial piston pump according to the invention in a sectional view
- 4 shows a radial piston pump according to the invention in a perspective view
- 5 is an enlarged view of a portion of an inventive
- FIG. 6 shows a further enlarged representation of a partial area according to FIG. 5;
- FIGS. 7-9 show an enlarged representation of a partial area of a radial piston pump according to the invention to clarify assembly steps;
- FIG. 10 shows a schematic representation of the fluid flow in a partial area of a radial piston pump
- 11-13 a schematic representation of an assembly variant
- 14-15 a schematic representation of an assembly variant
- 16-18 a schematic representation of an assembly variant
- 19 shows a retaining ring in a possible assembly position
- 20 shows a schematic representation of a possible mounting position of two
- 21 shows a schematic representation of a possible mounting position of a retaining ring.
- a radial piston pump essentially comprises a drive shaft 1 with an eccentric 11 and at least one piston/working chamber combination 2 which is accommodated in a pump body 3 .
- a longitudinal axis L of the drive shaft 1 is shown in FIG. 1 to define the axial direction.
- the piston-working chamber combination 2 essentially comprises a working chamber 21 and a piston 22.
- the working chamber 21 is closed with a cover 23 on the piston head side.
- the radial piston pump comprises at least two piston-working chamber combinations 2, 2a, 2b, ..., which extend radially from the drive shaft 1.
- the radial piston pump preferably comprises at least three, preferably six, piston/working chamber combinations 2, 2a, 2b, .
- each piston-working chamber combination 2, 2a, 2b, ... is provided with a cover 23, 23a, ....
- the piston-working space combinations 2, 2a, 2b, ... can be accommodated in a housing 6.
- a fluid inlet 241 is provided in the cover 23 or on the head side of the working space 21 .
- a fluid outlet 251 is also provided in the working space 21 , preferably in the wall of the working space 21 .
- the fluid inlet 241 is equipped with an inlet valve 24 which can selectively close or release the fluid inlet 241 .
- the fluid outlet 251 is equipped with an outlet valve 25 which can selectively close or release the fluid outlet 251 .
- the fluid F to be compressed flows via the fluid inlet 241 or the inlet valve 24 into the working chamber 21, is compressed there by the fluid movement of the piston 22 and leaves the working chamber 21 through the outlet valve 25 or the fluid outlet 251.
- the design of the valves for example as spring-loaded sheet metal valves, is well known to the person skilled in the art and does not require any further explanation here.
- Fig. la illustrates the effective system pressures and the involved pressure areas of the cover 23 arranged radially to the drive shaft 1.
- the cover 23 also includes a seal 26.
- the inlet valve 24, in particular including a valve plate with a reed valve, is located at the bottom of a cylindrical recess above the Working space on the pump body 3 on.
- the cover 23 presses from the outside onto the valve plate against the collar of the cylindrical recess.
- a vacuum is created in the working space between the piston head and the cover 23 and the inlet valve 24 opens into the working space and fresh gas is sucked in.
- the piston 22 moves upwards again, the inlet valve closes and the gas in the working chamber is compressed.
- the compressed gas leaves the working chamber 21 accordingly through the fluid outlet 251 or outlet valve 25.
- FIG. 2 shows a basic representation of a piston-working chamber combination of a radial piston pump to clarify its mode of operation; in particular, the fluid flow from the fluid inlet 241 via the working chamber 21 into the fluid outlet 251 is shown here.
- Fig. 2a is a variant of a piston-working chamber combination 2 with two fluid inlets 251 or two inlet valves 24 and a fluid outlet 241 or outlet valve 25 and in the 2b shows a variant of a piston-working chamber combination 2 with a fluid inlet 241 or an inlet valve and a fluid outlet 251 or an outlet valve 25.
- valves which can be designed as a sheet metal spring valve, for example, is sufficiently known to the person skilled in the art and does not require any further explanation here.
- the radial piston pump is equipped with at least one, preferably one, retaining ring 4 for fixing all covers 23, 23a to 23e of the radial piston pump.
- the covers 23 (a-e) of all piston-working chamber combinations 2 (a-e) are fixed simultaneously by means of just one common retaining ring 4 .
- FIGS. 3 and 4 illustrate the example of a 6-cylinder radial piston compressor.
- the retaining ring 4 generates the required holding force to hold all the covers 23 in position relative to the working chamber 21 or pump body 3 under operating conditions.
- a contact collar 5 can be seen clearly in FIG. 6, for example, and is designed in particular as a radially oriented surface.
- the axial position of the retaining ring 4 on the pump base body 3 and/or cover 23 can be ensured with the contact collar 5 . Due to the contact collar 5 on the cover 23, the angular position of the cover 23 relative to the pump base body 3 is preferably fixed at the same time when the retaining ring 4 is installed.
- the cover 23 can be equipped with a contact surface 232 for the retaining ring 4 .
- the retaining ring 4 can rest in a form-fitting manner on such a contact surface 232 .
- the combination of the contact collar 5 and the contact surface 232 can guide or secure the retaining ring 4 in its position relative to the cover 23 and in its angular position or concentricity to the pump longitudinal axis, e.g. in the assembled state or already during assembly.
- the pairing of all covers 23 to the retaining ring 4 should have a press fit. Ie the outer diameter of all contact points of the contact surfaces 232 should be larger than the inner diameter of the retaining ring 4 at the same temperature.
- This press coverage means that the retaining ring 4 - similar to a prestressed spring - fixes the cover 23 to the pump body 3 with a defined holding force, preferably by a defined press coverage of the inner diameter of the retaining ring to the cover contact surfaces, which ensures a sufficient holding force of the cover 23 to the pump body at all operating points 3 ensures.
- FIG. 5 shows an enlarged representation of a partial area of a radial piston pump according to the invention.
- the radial piston pump is equipped with a housing 6, which is used to accommodate at least sections of the pump base body 3, in particular the piston-working chamber combinations 2, 2a, 2b, ...is set up.
- the housing 6 of the radial piston pump is formed from at least two housing components, in particular a high-pressure housing 7 and/or a stator housing 8, in particular for accommodating a rotor and a stator of an electric motor.
- the retaining ring 4 is integrated into the housing 6 or at least one housing component 7, 8.
- the housing component with an integrated retaining ring and the other housing components form the housing of the radial piston pump.
- the housing components are screwed together to form the pump housing.
- the housing components are preferably screwed together using a screw 28 .
- the pump body 3 has a flange 27 or the like, which is used for screwing to the other housing components.
- Fluid channels of the radial piston pump, or at least partial areas thereof, can preferably be formed by means of the housing parts screwed together.
- Such a composite channel is, for example, the high-pressure channel 252.
- the housing components can delimit or seal different pressure areas within the radial piston pump or to the outside.
- the housing component has plane-parallel axial sealing surfaces. Sealing surfaces configured in this way can provide a tight connection to the adjacent housing component, such as the high-pressure housing 7 or the stator housing 8 .
- the surfaces of the sealing surfaces of the housing component are equipped with concentric grooves, in particular with a ripple in the radial direction. The sealing effect can be further improved by the concentric groove or grooves.
- seals are additionally or solely arranged between the sealing surfaces.
- the surfaces of the sealing surfaces have one or more geometric shapes that deviate from a flat or approximately flat surface. Provision can thus be made for the sealing surfaces to have a concave or convex shape for the purposeful formation of contact surfaces or line contacts.
- a flat sealing surface of a housing component can be brought into contact with the convex surface of another housing component and thus form a sealing surface.
- a defined line contact is advantageously formed between the two surfaces.
- Such line contact can preferably reproduce the function of a seal between corresponding components entirely or at least partially.
- One of the surfaces can advantageously exhibit elastic behavior, so that fluctuations in the distance between the components can be compensated for by the elasticity.
- FIG. 6 shows a further enlarged representation of a partial area according to FIG. 5.
- the inside diameter of the retaining ring 4 should preferably be in the tolerance class IT 7...8.
- the retaining ring 4 can be fixed, for example, by means of a thermal transverse press fit between the covers 23 and the retaining ring 4 .
- the retaining ring 4 is heated by means of a heat source or a heatable tool WHZ before assembly. Due to the thermal expansion of the retaining ring 4, an overlap between the retaining ring 4 and the cover 23 is eliminated in order to be able to join without force. In the heated state, radial play forms between the contact surface of the retaining ring 4 and the contact surfaces 232 of the cover 23 and the retaining ring 4 can be joined with almost no force. After assembly, the retaining ring 4 cools down and the overlap occurs again or due to the shrinkage of the diameter, a joint pressure is generated on all the covers 23.
- the minimum joint pressure that occurs, especially at each cover/retaining ring contact, should be so great that the cover 23 does not lift off the pump body 3 at the maximum pressure difference between high and low pressure.
- FIGS. 11 to 13 schematically.
- the retaining ring 4 can be fixed in place, for example, by means of a longitudinal interference fit between the covers 23 and the retaining ring 4 .
- the retaining ring 4 is pushed onto the cover 23 with an overlap.
- the retaining ring 4 stretches elastically.
- the overlap creates a force.
- FIGS. 14 and 15 schematically.
- the retaining ring 4 can also be brought into contact or abutment against the contact collar 5 .
- a fixation of the retaining ring 4 can also be carried out, for example, by a welded connection.
- the retaining ring 4 is preferably provided with a slot 41 or designed as an open ring and is fitted over the cover 23 and then clamped or pressed together by means of a tool W so that the retaining ring rests on all contact surfaces of the cover 23 .
- the gap between the ends of the ring is approx. 2mm.
- the welding process takes place using a welding device S, which closes the slotted retaining ring (approx. 2mm gap) by adding welding filler, in particular liquid metal.
- the welding filler material cools down, shrinks accordingly and thus generates tensile stress in the retaining ring 4.
- the accuracy requirements for the retaining ring 4 or the cover 23 can be lower in this variant.
- Such a method is shown in FIGS. 16 to 18 schematically.
- the covers In principle (not shown), however, it is also conceivable for the covers to be pressed elastically (radially) "inwards" by means of a device/tool W before the retaining ring is joined, in order to provide a joining gap for the retaining ring for the time of joining. If no gap is formed, at least the overlap can be somewhat reduced during assembly.
- the advantage here is that the thermal transverse press fit could be omitted (costs, temperature effect in the retaining ring or effect on its structure).
- the pushing-on/joining force can be reduced compared to the “normal” or “longitudinal interference fit” described above.
- cover This requires the cover to be able to spring/deflect elastically (dashed line) in order to form a joint gap (at least in the area of the contact surface 232). This can be achieved geometrically by the cover 23 or its geometric design.
- the figure shows (schematically): a tool W presses or deforms the cover 23 elastically, in particular the contact surface 232 yields elastically/radially inward, so that a gap is formed or the overlap between the retaining ring and the cover 23 is reduced. After the tool has been removed, the cover 23 or the contact surface 232 springs back elastically, so that an overlap is formed. So that the tool when joining the retaining ring 4 does not is in the way and the contact surface 232 can nevertheless be reliably deformed elastically, other geometric configurations should preferably be selected for the cover than those shown above.
- the elastic behavior can also be achieved by an element which is arranged between the cover and the pump housing/cylinder housing.
- the tightness and thus the not lifting of the cover must be guaranteed
- valves 24, 25 or inlet/outlet 251, 241 in relation to the cover 23 are shown in FIGS.
- the fluid inlet 251 or the inlet valve 24 is arranged off-center of the cover 23 in order to create space for the retaining ring 4 .
- a reed valve, possibly with a stop, can be used as the valve 24, 25, for example.
- One or more retaining rings 4 can be used per radial piston pump, such as shown in FIG. 20, retaining rings 4 and 4a.
- the retaining rings are preferably arranged axially one behind the other. Provision can preferably be made for the retaining ring 4 to have an assembly chamfer on the inside for simplified assembly.
- the radial piston pump proposed here can preferably be used as an air conditioning compressor, preferably with an electric motor as the drive. Accordingly, the fluid is preferably a refrigerant.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Details Of Reciprocating Pumps (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102021204713.0A DE102021204713A1 (de) | 2021-05-10 | 2021-05-10 | Radialkolbenpumpe, sowie Verfahren zur Herstellung einer Radialkolbenpumpe |
| PCT/EP2022/061481 WO2022238148A1 (de) | 2021-05-10 | 2022-04-29 | Radialkolbenpumpe, sowie verfahren zur herstellung einer radialkolbenpumpe |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP4337860A1 true EP4337860A1 (de) | 2024-03-20 |
| EP4337860B1 EP4337860B1 (de) | 2025-09-17 |
Family
ID=81877874
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP22727022.0A Active EP4337860B1 (de) | 2021-05-10 | 2022-04-29 | Radialkolbenpumpe, sowie verfahren zur herstellung einer radialkolbenpumpe |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US20240240623A1 (de) |
| EP (1) | EP4337860B1 (de) |
| CN (1) | CN117337360A (de) |
| DE (1) | DE102021204713A1 (de) |
| WO (1) | WO2022238148A1 (de) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102023106706A1 (de) * | 2023-03-17 | 2024-09-19 | Thyssenkrupp Ag | Radialkolbenverdichter |
| DE102023125557A1 (de) * | 2023-09-20 | 2025-03-20 | Thyssenkrupp Ag | Radialkolbenverdichter |
| WO2026052676A1 (de) | 2024-09-04 | 2026-03-12 | Thyssenkrupp Dynamic Components Gmbh | Radialkolbenverdichter |
| DE102024125305A1 (de) * | 2024-09-04 | 2026-03-05 | Thyssenkrupp Ag | Radialkolbenverdichter |
| DE102024125302A1 (de) | 2024-09-04 | 2026-03-05 | Thyssenkrupp Ag | Radialkolbenverdichter |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2621607A (en) * | 1947-01-03 | 1952-12-16 | Trapp George Joseph | Pump |
| US3784331A (en) * | 1972-05-18 | 1974-01-08 | Gen Motors Corp | Radial compressor with two-piece cylinder housing and shell |
| DE2852852C2 (de) * | 1978-12-07 | 1981-02-26 | Zahnradfabrik Friedrichshafen Ag, 7990 Friedrichshafen | Kolbenpumpe, insbesondere Radialkolbenpumpe |
| WO1992014056A1 (de) * | 1991-01-30 | 1992-08-20 | Barmag Luk Automobiltechnik Gmbh & Co. Kg | Radialkolbenpumpe |
| EP0520286B1 (de) * | 1991-06-27 | 1995-12-20 | LuK Automobiltechnik GmbH & Co. KG | Radialkolbenpumpe |
| DE10027424A1 (de) * | 2000-06-02 | 2001-12-06 | Zf Batavia Llc | Radialkolbenpumpe |
| WO2010138509A1 (en) | 2009-05-26 | 2010-12-02 | Husco International, Inc. | Compact eccentric radial piston hydraulic machine |
| DE102010064084A1 (de) | 2010-12-23 | 2012-06-28 | Robert Bosch Gmbh | Kolbenpumpe mit einer Laufbuchse |
| US8926298B2 (en) * | 2012-01-04 | 2015-01-06 | Husco International, Inc. | Hydraulic piston pump with a variable displacement throttle mechanism |
| JP6625388B2 (ja) * | 2015-10-02 | 2019-12-25 | 三菱重工サーマルシステムズ株式会社 | 密閉容器のシール構造、これを備えた車両用冷媒圧縮機 |
-
2021
- 2021-05-10 DE DE102021204713.0A patent/DE102021204713A1/de active Pending
-
2022
- 2022-04-29 EP EP22727022.0A patent/EP4337860B1/de active Active
- 2022-04-29 CN CN202280034100.9A patent/CN117337360A/zh active Pending
- 2022-04-29 WO PCT/EP2022/061481 patent/WO2022238148A1/de not_active Ceased
- 2022-04-29 US US18/289,362 patent/US20240240623A1/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| DE102021204713A1 (de) | 2022-11-10 |
| WO2022238148A1 (de) | 2022-11-17 |
| EP4337860B1 (de) | 2025-09-17 |
| CN117337360A (zh) | 2024-01-02 |
| US20240240623A1 (en) | 2024-07-18 |
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