WO2015145578A1 - 全閉形主電動機 - Google Patents
全閉形主電動機 Download PDFInfo
- Publication number
- WO2015145578A1 WO2015145578A1 PCT/JP2014/058313 JP2014058313W WO2015145578A1 WO 2015145578 A1 WO2015145578 A1 WO 2015145578A1 JP 2014058313 W JP2014058313 W JP 2014058313W WO 2015145578 A1 WO2015145578 A1 WO 2015145578A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- exhaust port
- end portion
- diameter side
- bracket
- rotor
- Prior art date
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K9/00—Arrangements for cooling or ventilating
- H02K9/02—Arrangements for cooling or ventilating by ambient air flowing through the machine
- H02K9/04—Arrangements for cooling or ventilating by ambient air flowing through the machine having means for generating a flow of cooling medium
- H02K9/06—Arrangements for cooling or ventilating by ambient air flowing through the machine having means for generating a flow of cooling medium with fans or impellers driven by the machine shaft
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K5/00—Casings; Enclosures; Supports
- H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
- H02K5/16—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K9/00—Arrangements for cooling or ventilating
- H02K9/10—Arrangements for cooling or ventilating by gaseous cooling medium flowing in closed circuit, a part of which is external to the machine casing
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K5/00—Casings; Enclosures; Supports
- H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
- H02K5/10—Casings or enclosures characterised by the shape, form or construction thereof with arrangements for protection from ingress, e.g. water or fingers
Definitions
- the present invention relates to a fully-enclosed main motor.
- a fully enclosed main motor (a fully-closed main motor) is often used from the viewpoint of maintenance saving.
- This fully-enclosed main motor has a cylindrical frame in which a rotor is arranged on the inner peripheral side, and a bracket that is arranged opposite to both ends of the frame and rotatably supports a rotor shaft. Yes.
- a bearing is provided at the center of the bracket, and a cylindrical stator core that houses the stator coil is attached to the inner periphery of the frame. Between the inner peripheral surface of the stator core and the outer peripheral surface of the rotor. Is provided with a uniform gap.
- the cooling fan and the frame separating the inside and outside of the machine are in a relationship between the rotating part and the fixed part, so it is necessary to provide a labyrinth between the cooling fan and the frame. Therefore, there is a problem that dust or water slightly enters the machine through this labyrinth.
- the present invention has been made in view of the above, and an object of the present invention is to provide a fully-enclosed main electric motor that can suppress the intrusion of dust into the machine without applying or filling grease in the labyrinth.
- a fully-enclosed main motor includes a stator, a rotor core disposed on the inner peripheral side of the stator, and a reaction between the rotor core and the rotor core.
- a cooling fan that is attached to an end portion on the drive side and that partitions the inside and outside of the main electric motor, and is attached to the rotor core, and a hollow portion extends from the end surface on the non-drive side to at least the front of the mounting location of the cooling fan in the axial direction.
- a rotor shaft that is provided and has a side surface provided with a ventilation hole communicating with the hollow portion; a frame that includes the stator and the rotor; and an end portion on the drive side of the frame
- a first bracket connected to the frame, and an exhaust port connected to an end of the frame on the non-driving side, at least a part of which is disposed on the inner diameter side of the end of the main plate of the cooling fan on the non-driving side
- a second bracket that forms a labyrinth with the end of the main plate, a first bearing that is provided on the first bracket and supports the rotor shaft, and a second bracket. And a second bearing portion that supports the rotor shaft on the side opposite to the driving hole from the ventilation hole.
- FIG. 1 is a longitudinal sectional view of a fully-enclosed main motor according to an embodiment.
- FIG. 2 is an enlarged view of a main part of FIG.
- FIG. 3 is an enlarged view of a main part in a vertical section different from that of FIG.
- FIG. 4 is a partially enlarged view of FIG.
- FIG. 5 is a diagram for explaining the operation and effect of the embodiment.
- FIG. 6 is another diagram for explaining the operation and effect of the embodiment.
- FIG. 1 is a longitudinal sectional view of a fully closed main motor according to the present embodiment.
- FIG. 2 is an enlarged view of a main part of FIG.
- FIG. 3 is an enlarged view of a main part in a vertical section different from that of FIG.
- FIG. 4 is a partially enlarged view of FIG. 1 and 2 are vertical cross sections that do not include the exhaust port 12, and FIGS. 3 and 4 are vertical cross sections that include the exhaust port 12.
- FIG. 1 and FIG. 2 the position of the exhaust port 12 is shown with the dotted line for reference.
- the fully closed main motor 100 includes a stator 10 composed of a stator core 3 and a stator coil 8, a rotor 7 disposed on the inner peripheral side of the stator 10, and the stator 10 and the rotor 7.
- a cylindrical frame 2 a bracket 1 connected to one axial end of the frame 2, a bracket 11 connected to the other axial end of the frame 2, and a bearing provided at the axial center of the bracket 1 Part 50 and a bearing part 51 provided at the axial center part of the bracket 11.
- the bracket 11 is configured integrally with the frame 2, but may be separate from the frame 2.
- a ventilation path 22 is formed on the outer peripheral side of the stator core 3.
- the ventilation path 22 is formed in the stator core 3 so as to communicate the driving side (load side) and the non-driving side (anti-load side).
- a plurality of ventilation paths 22 are provided at equal intervals in the circumferential direction of the frame 2.
- the drive side is the tip side of the rotor shaft 24 connected to a load (not shown), and the non-drive side is the opposite side.
- the driving side is the bracket 1 side, and the non-driving side is also the bracket 11 side.
- the rotor 7 is arranged on the inner peripheral side of the stator 10, a rotor core 4 formed by laminating electromagnetic steel plates, an iron core presser 5 that covers one end side of the rotor core 4, and the other end side of the rotor core 4.
- the core retainer 6 covering the core, the cooling fan 30 attached to the iron core retainer 5, the cooling fan 40 attached to the iron core retainer 6, the rotor bar 13 embedded in the rotor iron core 4, and both ends of the rotor bar 13.
- a ring-shaped end ring 14 provided and a rotor shaft 24 fitted into the rotor core 4 are provided.
- a uniform gap 80 is provided between the inner peripheral surface of the stator core 3 and the outer peripheral surface of the rotor core 4.
- the bearing portion 50 includes a bearing 50 a that rotatably supports the tip end portion of the rotor shaft 24, bearing stoppers 50 b and 50 c that are respectively attached to the tip portion of the rotor shaft 24, and a bearing cap 50 d that is attached to the bracket 1. And.
- a bearing 50 a that rotatably supports the tip end portion of the rotor shaft 24, bearing stoppers 50 b and 50 c that are respectively attached to the tip portion of the rotor shaft 24, and a bearing cap 50 d that is attached to the bracket 1.
- an inner ring is sandwiched between bearing stoppers 50b and 50c, and an outer ring is sandwiched between the bracket 1 and a bearing cap 50d.
- the bracket 1 is provided with a grease pocket 31a
- the bearing cap 50d is provided with a grease pocket 31b.
- the grease pocket 31a is disposed at a position facing one end of the bearing 50a in the axial direction
- the grease pocket 31b is disposed at a position facing the other end of the bearing 50a in the axial direction.
- a labyrinth 32a is provided between the bracket 1 and the bearing stopper 50b, and a labyrinth 32b is provided between the bearing cap 50d and the bearing stopper 50c.
- the labyrinths 32a and 32b are labyrinth-like minute gaps that form the boundary between the rotating part and the fixed part, prevent the lubricating grease from leaking out of the machine, and dust or water from the outside of the machine to the bearing 50a and the machine. Prevent the intrusion.
- the bearing portion 51 is attached to the bearing 11 a that rotatably supports the rear end portion 24 a of the rotor shaft 24, bearing stoppers 51 b and 51 c that are respectively attached to the rear end portion 24 a of the rotor shaft 24, and the bracket 11. And a bearing cap 51d attached to the housing 33.
- the bearing 51a has an inner ring sandwiched between bearing stoppers 51b and 51c, and an outer ring sandwiched between the housing 33 and a bearing cap 51d.
- the rear end 24a is the end of the rotor shaft 24 on the side opposite to the driving side.
- the housing 33 is provided with a grease pocket 34a, and the bearing cap 51d is provided with a grease pocket 34b.
- the grease pocket 34a is disposed at a position facing the one end of the bearing 51a in the axial direction
- the grease pocket 34b is disposed at a position facing the other end of the bearing 51a in the axial direction.
- a labyrinth 35a is provided between the housing 33 and the bearing stopper 51b, and a labyrinth 35b is provided between the bearing cap 51d and the bearing stopper 51c.
- the labyrinths 35a and 35b are labyrinth-like minute gaps that constitute the boundary between the rotating part and the fixed part, prevent the lubricating grease from leaking out of the machine, and dust or water from the outside of the machine to the bearing 51a and the machine. Prevent the intrusion.
- a hollow portion 24 b is provided in the rear end portion 24 a of the rotor shaft 24.
- the rear end portion 24a has a hollow cylindrical shape.
- the hollow portion 24b is provided in a certain length in the axial direction from the rear end surface of the rotor shaft 24, for example, in a cylindrical shape.
- the hollow portion 24b is provided from the rear end surface of the rotor shaft 24 in the axial direction beyond the attachment portion of the bearing portion 51 to at least the base end portion (attachment portion to the rotor 7) of the cooling fan 40. Yes.
- a plurality of ventilation holes 24c are provided in the circumferential direction on the side surface of the rear end 24a.
- the ventilation hole 24c passes through the side surface of the rear end portion 24a in the radial direction between the mounting portion of the cooling fan 40 and the bearing portion 51 in the axial direction, and communicates with the hollow portion 24b.
- the bearing portion 51 supports the rear end portion 24a on the non-driving side from the ventilation hole 24c.
- the bearing cap 51d and the bearing stopper 51c are formed in an annular shape so as not to close the opening of the end surface of the rear end portion 24a.
- the cooling fan 30 includes, for example, a mortar-shaped main plate 30a whose inner diameter increases toward the driving side, and a plurality of blades 30b provided on the main plate 30a.
- the cooling fan 30 is attached to the end of the rotor core 4 on the drive side via the core retainer 5.
- the cooling fan 30 can stir the air in the machine. Further, in FIG. 1, the cooling fan 30 is provided on the drive side, but the effect of the present application is not changed for a configuration without the cooling fan 30.
- the cooling fan 40 includes, for example, a mortar-shaped main plate 40a and a plurality of wings 40b provided on the main plate 40a.
- the cooling fan 40 is attached to the end of the rotor core 4 on the counter drive side via the iron core retainer 6.
- the main plate 40 a partitions the inside and outside of the fully closed main motor 100.
- the cooling fan 40 can agitate the air in the machine.
- a labyrinth 41 is provided between the main plate 40a and the bracket 11. That is, the labyrinth 41 is provided between the end surface of the end portion 40d of the main plate 40a and the inner surface of the bracket 11 facing the end surface.
- the end portion 40d is an end portion of the main plate 40a on the non-driving side.
- the labyrinth 41 is provided with a certain length in the radial direction, and is provided over the circumferential direction around the rotor shaft 24.
- the labyrinth 41 extends from the opening on the inner diameter side to the outer diameter side, and then extends to the axial driving side, and then extends to the outer diameter side, and then extends to the axial driving side, and subsequently to the outer diameter side. It extends to the outer diameter side, and further extends to the outer diameter side to the opening on the outer diameter side.
- the specific shape of the labyrinth 41 is not limited to the illustrated example.
- the inner diameter of the main plate 40a increases toward the non-driving side, the inner diameter starts to decrease at the end portion 40d.
- the inner peripheral surface of the end portion 40 d is formed in a concave shape that is smooth in the axial direction with respect to the rotor shaft 24.
- the inner diameter side end portion 40c which is a portion on the inner diameter side of the end portion 40d, protrudes to the non-driving side as compared with other portions of the end portion 40d, for example. Specifically, the inner diameter side end portion 40c protrudes in the axial direction from the portion of the inner surface of the bracket 11 where the labyrinth 41 is not provided to the non-driving side (FIG. 2).
- the bracket 11 is provided with, for example, a plurality of exhaust ports 12 penetrating the bracket 11 in the circumferential direction.
- the exhaust port 12 is disposed so that at least a part thereof is located on the inner diameter side of the end portion 40d.
- the exhaust port 12 is formed in such a position and size that the inner diameter side end portion 40c is included in the radial opening range, and the portion of the inner diameter side end portion 40c facing the exhaust port 12 is the exhaust port. 12 protrudes into the inside (FIG. 3). Further, the inner diameter side end portion 40c is disposed on the outer diameter side in the exhaust port 12 so that the exhaust port 12 is not blocked.
- FIG. 4 shows details of the exhaust port 12 and the end 40d.
- the outer diameter side portion of the vertical cross-sectional shape of the exhaust port 12 is inclined with respect to the axial direction so that the radial size of the exhaust port 12 increases toward the non-driving side. That is, the outer diameter side portion 12a of the surface of the bracket 11 constituting the exhaust port 12 is inclined with respect to the axial direction so as to be separated from the rotor shaft 24 toward the counter drive side.
- the inner diameter side portion of the longitudinal cross-sectional shape of the exhaust port 12 is parallel to the axial direction. That is, the inner diameter side portion 12b of the surface of the bracket 11 constituting the exhaust port 12 is parallel to the axial direction.
- the cross-sectional shape of the exhaust port 12 may be a square, for example. Note that the cross-sectional shape of the exhaust port 12 may be a shape other than a square. Further, the inner diameter side portion 12b can also be inclined with respect to the axial direction on the opposite side to the outer diameter side portion 12a. In this case, the cross-sectional shape of the exhaust port 12 can be circular, for example.
- the length of the inner diameter side end portion 40c is shown between AB, and the axial position inside the exhaust port 12 is shown by a straight line connecting CD. Since a part of the inner diameter side end 40c in the axial direction protrudes into the exhaust port 12, AB and CD intersect each other.
- a straight line extending the outer diameter side portion of the exhaust port 12 to the driving side in the longitudinal sectional shape of the exhaust port 12 intersects AB, and the intersection is located between AB.
- the inner peripheral surface of the end portion 40d is formed in a smooth concave shape in the axial direction with respect to the rotor shaft 24 (see the vicinity of R).
- FIG. 5 is a diagram for explaining the operation and effect of the present embodiment, and arrows indicate wind currents.
- FIG. 6 is another figure for demonstrating the operation
- the cooling fan 40 also rotates with the rotation of the rotor 7. As the cooling fan 40 rotates, the cooling air enters from the end surface of the rear end portion 24a of the rotor shaft 24, flows through the hollow portion 24b and flows out from the ventilation hole 24c in the outer diameter direction, and further, the main plate 40a and the bearing portion 51. The air flow is formed between the air outlet and the direction of the inner peripheral surface of the end portion 40d.
- the cooling air flows through the hollow portion 24b of the rotor shaft 24, the cooling air flows through the air passage formed between the main plate 40a and the bearing portion 51.
- the central side of the bearing 51 can also be cooled.
- heat from the rotor core 4 side is also cut off. Therefore, in this embodiment, even if the air volume by the cooling fan 40 is reduced, the temperature rise of the bearing portion 51 can be suppressed. Therefore, the capacity of the cooling fan 40 can be reduced and the air volume can be reduced. As a result, the wind pressure is reduced, dust guided to the labyrinth 41 is suppressed, and entry of dust into the fully closed main electric motor 100 can be suppressed.
- the intrusion of dust into the labyrinth 41 can be suppressed and the intrusion of dust into the machine can be prevented without applying and filling the grease into the labyrinth 41 as in Patent Document 1. be able to.
- the cooling air mixed with dust is directed toward the rotor shaft 24 at the end 40d, so that it is difficult for the cooling air to enter the labyrinth 41, and the invasion of dust into the labyrinth 41 is further prevented.
- the dust is exhausted from the exhaust port 12 together with the cooling air before reaching the entrance of the labyrinth 41.
- the inner peripheral surface of the end portion 40d is preferably formed concavely and smoothly in the axial direction, but other shapes are possible as long as the cooling air is directed toward the rotor shaft 24. .
- a labyrinth is provided between the ventilation fan (415) and the bracket (204).
- the labyrinth is inside the exhaust port, and a part of the cooling air flowing out from the inside is bounced back to the wall surface of the bracket (204).
- the opening of the labyrinth is opened on the opposite side of the wall surface of the bracket (204), dust contained in the cooling air enters the labyrinth.
- the bracket (204) protruding toward the ventilation fan (415) is concave near the opening of the labyrinth, it has a shape in which moisture tends to accumulate near the opening of the labyrinth, If moisture accumulates at this location, it will be pushed into the labyrinth.
- the opening on the inner diameter side of the labyrinth 41 is opened in the radial direction, even if the cooling air is bounced off the wall surface of the bracket 11, the cooling air containing dust is opened. From entering the labyrinth is suppressed. Further, by causing the inner diameter side end portion 40 c to protrude into the exhaust port 12, moisture flowing along the main plate 40 a is suppressed from entering the labyrinth 41 beyond the first radial portion of the labyrinth 41.
- fully closed main motor 100 shows an example of the contents of the present invention, and can be combined with another known technique and does not depart from the gist of the present invention. Of course, it is possible to change the configuration such as omitting a part.
- the present invention is useful as a fully-enclosed main motor for, for example, a railway vehicle.
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- Power Engineering (AREA)
- Motor Or Generator Frames (AREA)
- Motor Or Generator Cooling System (AREA)
Abstract
Description
図1は、本実施の形態に係る全閉形主電動機の縦断面図である。図2は、図1の要部拡大図である。図3は、図1とは別の縦断面による要部拡大図である。図4は、図3の部分拡大図である。なお、図1および図2は、排気口12を含まない縦断面であり、図3および図4は、排気口12を含む縦断面である。また、図1および図2では、参照のため排気口12の位置を点線で示している。以下、図1~図4を参照して、本実施の形態に係る全閉形主電動機の構成について説明する。
Claims (6)
- 固定子と、
前記固定子の内周側に配置される回転子鉄心と、前記回転子鉄心の反駆動側の端部に取り付けられ、当該主電動機の内外を仕切る冷却ファンと、前記回転子鉄心に取り付けられ、反駆動側の端面から軸方向に少なくとも前記冷却ファンの取付け箇所の手前まで中空部が設けられると共に、前記中空部に連通する通風穴が側面に設けられた回転子軸と、を有する回転子と、
前記固定子および前記回転子を内包するフレームと、
前記フレームの駆動側の端部に接続された第1のブラケットと、
前記フレームの反駆動側の端部に接続され、少なくともその一部が前記冷却ファンの主板の反駆動側の端部よりも内径側に配置された排気口が設けられると共に、前記主板の前記端部との間でラビリンスを構成する第2のブラケットと、
前記第1のブラケットに設けられ、前記回転子軸を支持する第1の軸受部と、
前記第2のブラケットに設けられ、前記回転子軸を前記通風穴よりも反駆動側で支持する第2の軸受部と、
を備えることを特徴とする全閉形主電動機。 - 前記主板の前記端部の内周面は、前記軸方向に滑らかでかつ凹状に形成されていることを特徴とする請求項1に記載の全閉形主電動機。
- 前記主板の前記端部の一部分である内径側端部は、当該端部の他の部分よりも反駆動側に突出しており、
前記排気口は、その径方向の開口範囲に前記内径側端部が含まれるような位置および大きさに形成され、
前記内径側端部の前記排気口に面する部分が、前記排気口内に突出していることを特徴とする請求項1または2に記載の全閉形主電動機。 - 前記内径側端部は、前記排気口内では、外径側に配置されていることを特徴とする請求項3に記載の全閉形主電動機。
- 前記排気口の外径側の縦断面形状は、前記排気口の径方向の大きさが反駆動側に向かうにつれて拡大するように前記軸方向に対して傾斜していることを特徴とする請求項4に記載の全閉形主電動機。
- 前記排気口の外径側の縦断面形状を駆動側に延長すると、前記内径側端部の外径側側面と交差することを特徴とする請求項5に記載の全閉形主電動機。
Priority Applications (4)
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PCT/JP2014/058313 WO2015145578A1 (ja) | 2014-03-25 | 2014-03-25 | 全閉形主電動機 |
JP2016509674A JP5968575B2 (ja) | 2014-03-25 | 2014-03-25 | 全閉形主電動機 |
US15/125,810 US10103601B2 (en) | 2014-03-25 | 2014-03-25 | Totally-enclosed main motor |
EP14886853.2A EP3125410B1 (en) | 2014-03-25 | 2014-03-25 | Totally enclosed main electric motor |
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PCT/JP2014/058313 WO2015145578A1 (ja) | 2014-03-25 | 2014-03-25 | 全閉形主電動機 |
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US (1) | US10103601B2 (ja) |
EP (1) | EP3125410B1 (ja) |
JP (1) | JP5968575B2 (ja) |
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FR3038468B1 (fr) * | 2015-07-02 | 2018-07-13 | Moteurs Leroy-Somer | Machine electrique tournante a turbine a depression augmentee |
JP6994422B2 (ja) * | 2018-04-09 | 2022-01-14 | 東芝三菱電機産業システム株式会社 | 回転電機、軸受構造体、およびギャップ検査方法 |
US11813729B2 (en) | 2018-05-14 | 2023-11-14 | Black & Decker Inc. | Power tool with partition assembly between transmission and motor |
US10971966B2 (en) | 2018-05-14 | 2021-04-06 | Black & Decker Inc. | Power tool with partition assembly between transmission and motor |
CN113937945A (zh) * | 2021-10-22 | 2022-01-14 | 中车株洲电机有限公司 | 一种对轴承冷却的永磁电机及电力机车 |
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- 2014-03-25 EP EP14886853.2A patent/EP3125410B1/en active Active
- 2014-03-25 WO PCT/JP2014/058313 patent/WO2015145578A1/ja active Application Filing
- 2014-03-25 US US15/125,810 patent/US10103601B2/en active Active
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JP2008245347A (ja) * | 2007-03-26 | 2008-10-09 | Ntn Corp | 車両用主電動機 |
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JP2013230031A (ja) * | 2012-04-26 | 2013-11-07 | Nsk Ltd | モータ |
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Publication number | Publication date |
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EP3125410B1 (en) | 2020-01-08 |
EP3125410A1 (en) | 2017-02-01 |
JP5968575B2 (ja) | 2016-08-10 |
JPWO2015145578A1 (ja) | 2017-04-13 |
US10103601B2 (en) | 2018-10-16 |
US20170005545A1 (en) | 2017-01-05 |
EP3125410A4 (en) | 2018-01-31 |
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