JP2013051788A - Rotary electric machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotary electric machine capable of reducing an amount of discharged powder dust.SOLUTION: In a flange part 2b, a reservoir 2e for depositing a friction powder and the like is formed at a portion where air guided by a fan 20 strikes. The reservoir 2e is provided in a recessed state from a top face of the flange part 2b towards an opposite direction of the fan 20, and formed in an annular shape which is coaxial with the fan 20.

Description

  The present invention relates to a dustproof structure for a rotating electrical machine.

  In a motor with a brush, a brush and a commutator are mechanically slid to energize a coil connected to the commutator, and rectify to rotate the motor. Since the brush and commutator slide mechanically, the brush and commutator wear together. Since the brush is mainly composed of carbon and copper and the commutator is copper, the wear powder contains copper.

  The abrasion powder accumulated in the motor causes insulation deterioration and the like. For this reason, there is one in which a member formed of a resin is provided at a place where the wear powder is deposited, and the wear powder is deposited on the cover (for example, see Patent Document 1).

Japanese Patent Laid-Open No. 11-146595

  By the way, the abrasion powder generated as described above may jump out of the motor from an opening for cooling the inside of the motor. A motor with a brush is used as a blower motor of an air conditioning system, for example. In such a case, the wear powder jumping out of the motor adheres to the fan in the system, the inner wall of the duct, or the like. When copper adheres to an aluminum member (for example, an evaporator), there arises a problem that corrosion occurs.

  The present invention has been made to solve the above problems, and an object of the present invention is to provide a rotating electrical machine capable of reducing the amount of dust discharged.

  In order to solve the above-mentioned problem, the invention described in claim 1 includes a motor main body case, and an end cover that has an opening that communicates the inside and outside of the motor and covers the opening of the motor main body case. A motor that drives the rotating shaft by a brush and a commutator, a fan that is mounted on the rotating shaft that protrudes from the end cover, and a reservoir that holds the motor and that guides air flowing out of the opening by the fan. A motor holder having a portion.

  According to this configuration, the dust generated from the sliding contact portion between the brush and the commutator is included in the air flowing out from the opening of the motor, and the air is guided to the reservoir portion. Accordingly, the dust contained in the air accumulates in the pool portion, so that the amount of dust contained in the air sent by the fan is reduced.

  According to a second aspect of the present invention, in the rotating electrical machine according to the first aspect, a fin for inducing dust generated from a sliding contact portion with the brush and the commutator is formed at the lower end portion of the fan. Has been.

  According to this configuration, dust contained in the air flowing out from the motor is guided into the accumulation portion by the fins formed at the lower end portion of the fan. The amount of dust contained is reduced.

According to a third aspect of the present invention, in the rotating electric machine according to the second aspect, the tip end portion in the axial direction of the fin enters the pool portion.
According to this configuration, the fins and the reservoir portion constitute a maze structure, and the dust accumulated in the reservoir portion is difficult to go out.

According to a fourth aspect of the present invention, in the rotating electric machine according to the third aspect, the fin has a side surface that is inclined in the rotational direction of the fan.
According to this configuration, the dust contained in the air flowing out of the motor is forcibly guided into the accumulation portion by the inclined side surface and accumulated in the accumulation portion when the fan rotates. The amount of dust contained is reduced.

  According to a fifth aspect of the present invention, there is provided a motor main body case, an end cover having an opening for communicating the inside and outside of the motor, and covering the opening of the motor main body case, a brush for driving the rotating shaft, and a rectification And a partition wall disposed in the end cover and surrounding the commutator.

According to this configuration, dust generated from the sliding contact portion between the brush and the commutator is accumulated on the inner side surface of the partition wall surrounding the commutator, so that the amount of dust flowing out from the motor to the outside is reduced.
A sixth aspect of the present invention is the rotating electric machine according to the fifth aspect, wherein the commutator side surface of the partition wall is provided with an adsorbing member that adsorbs dust.

According to this configuration, since dust is adsorbed by the adsorption member, the amount of dust flowing out from the motor to the outside is further reduced.
The invention according to claim 7 has a motor main body case and an end cover that has an opening that communicates the inside and outside of the motor and covers the opening of the motor main body case, and is rotated by a brush and a commutator. A motor that drives the shaft; a motor holder that holds the motor; and a dust-proof cover that covers the end cover and is held by the motor holder.

  According to this configuration, dust generated from the sliding contact portion between the brush and the commutator flows out from the opening of the motor and adheres to the dustproof cover. Therefore, the amount of dust contained in the air sent by the fan is reduced.

According to an eighth aspect of the present invention, in the rotating electric machine according to the seventh aspect, the dustproof cover is formed in a dome shape, and an opening end portion thereof is attached to a flange portion of the motor holder.
According to this configuration, since the opening end of the dust cover is attached to the flange portion of the motor holder, the air flowing out from the motor opening is more securely attached to the dust cover and is sent to the air sent by the fan. The amount of dust contained is further reduced.

According to a ninth aspect of the present invention, in the rotary electric machine according to the eighth aspect, the dust-proof cover is made of metal.
According to this configuration, noise emitted from the motor to the outside of the motor is reduced by the metal dustproof cover.

  According to the present invention, the amount of dust discharged can be reduced.

(A) Sectional drawing of the air blower of 1st embodiment, (b) Partially expanded sectional view. Sectional drawing of the end cover of 2nd embodiment. Schematic explanatory drawing of an end cover. Sectional drawing of the air blower of 3rd embodiment.

(First embodiment)
Hereinafter, a first embodiment will be described with reference to the drawings.
As shown to Fig.1 (a), the air blower 1 of a vehicle air conditioner is provided with the motor holder 2 for attaching this apparatus to an air conditioner. The motor holder 2 has a substantially bottomed cylindrical accommodating portion 2a formed at the center thereof, and a disc-shaped flange portion 2b formed on the outer periphery of the accommodating portion 2a. A motor 3 that is a driving source of the blower 1 is accommodated and held in the accommodating portion 2a.

  The motor 3 includes a substantially bottomed cylindrical yoke housing (motor body case) 4. The bottom of the yoke housing 4 is fixed to the motor holder 2 with screws 5 or the like. A magnet 6 is fixed to the inner peripheral surface of the yoke housing 4. An armature 7 is rotatably accommodated inside the magnet 6. A lower end portion of the rotation shaft 8 of the armature 7 is rotatably supported by a bearing 9 provided at the bottom portion of the yoke housing 4.

  An end cover 10 is attached to the upper opening of the yoke housing 4. An opening 11 is provided between the end cover 10 or between the end cover 10 and the upper opening of the yoke housing 4. The end cover 10 is provided with a bearing 12 that rotatably supports the upper side of the rotary shaft 8. Further, the end cover 10 is provided with a brush holder 13, and the brush holder 13 holds a brush 15 that is in sliding contact with the commutator 14 of the armature 7. The brush 15 is connected to an external drive power source (not shown) and supplies power to the armature 7 via the commutator 14. A fan 20 is fixed to the upper end portion of the rotary shaft 8 protruding from the end cover 10.

  A through hole 4 a that penetrates the inside and outside of the yoke housing 4 is formed at the bottom of the yoke housing 4. A communication passage 17 that communicates with the through hole 4 a is formed between the bottom of the yoke housing 4 and the bottom of the housing portion 2 a of the motor holder 2.

  The motor holder 2 is mounted so that the air passage member 18 is in close contact with the outer surface of the housing portion 2a and the lower surface of the flange portion 2b. The air passage member 18 has an air passage 18 a that connects the communication hole 2 c provided in the outer edge portion of the flange portion 2 b and the communication passage 17. Here, the communication hole 2c extends in the vertical direction, and the air passage 18a extends substantially linearly downward from the communication hole 2c.

  A blower case 30 that covers the periphery of the fan 20 is mounted on the upper surface 2d of the flange portion 2b. An air intake port 30a connected to an introduction duct (not shown) for introducing air inside or outside the vehicle compartment is formed in the upper portion of the blower case 30, and the side surface thereof is connected to a blower duct (not shown). A vent hole (not shown) is provided. And if the fan 20 rotates, the air taken in from the air intake port 30a will be guide | induced to a ventilation port, and will be sent into a vehicle interior via a ventilation duct and an air conditioner.

  Further, the blower case 30 is formed with a diversion duct 30b for diverting a part of the air introduced from the air intake port 30a as cooling air for cooling the inside of the motor 3. The shunt duct 30b extends linearly from an upstream opening 30c provided on the upper side of the fan 20 in the vertical direction, and the downstream opening 30d is connected to the communication hole 2c of the flange portion 2b.

  The cooling air introduced into the diversion duct 30 b is supplied into the motor 3 through the communication hole 2 c, the air passage 18 a, the communication path 17, and the through hole 4 a of the yoke housing 4. The cooling air flowing into the motor 3 cools the inside of the motor 3 and flows out from the opening 11 above the motor 3.

  The cooling air passing through the inside of the motor 3 and flowing out from the opening 11 includes dust such as friction powder generated from the sliding contact portions of the commutator 14 and the brush 15. The flange portion 2b is formed with a reservoir portion (dust reservoir portion) 2e for depositing dust such as friction powder at locations where the air guided by the fan 20 hits.

More specifically, the fan 20 includes a support portion 21, annular connection portions 22 and 24, fins 23, and sub fins 25.
The support portion 21 is formed in a substantially dome shape so as to cover the end cover 10 of the motor 3. The top of the support portion 21 is fixed to the tip of the rotation shaft 8 of the motor 3 so as to rotate integrally with the rotation shaft 8. A connecting portion 22 that extends radially outward along a plane orthogonal to the rotation axis is formed at the radially outer tip of the support portion 21. The connecting portion 22 is formed in an annular shape that is coaxial with the rotating shaft. The connecting portion 22 connects one end of the plurality of fins 23, and the other end of the plurality of fins 23 is connected by the connecting portion 24. The several fin 23 is arrange | positioned at equal intervals along the circumferential direction of a rotating shaft. FIG. 1A schematically shows one fin 23 on each of the left and right sides.

  The fan 20 configured as described above causes the gas on one end side in the axial direction (the upper side in FIG. 1A) to flow outward in the radial direction of the fan 20 by the action of the fins 23 as the rotary shaft 8 rotates. And the air discharged | emitted from the inside of the motor 3 is guide | induced toward the flange part 2b upper surface of the motor holder 2 along the lower surface of the support part 21. As shown in FIG.

  In the flange portion 2b, a reservoir portion 2e for depositing friction powder or the like is formed at a location where the air guided by the fan 20 hits. The reservoir portion 2e is recessed from the upper surface of the flange portion 2b toward the anti-fan 20 (downward in FIG. 1A) and is formed in an annular shape coaxial with the fan 20.

  Further, a prevention wall 2f is formed on the upper surface of the flange portion 2b on the outer side in the radial direction from the pool portion 2e. The prevention wall 2f is formed in a cylindrical shape extending from the upper surface of the flange portion 2b toward the fan 20 in parallel with the rotation axis.

  And the fan 20 is equipped with the sub fin 25 for guide | inducing friction powder etc. in the accumulation part 2e. The sub fins 25 are arranged at equal intervals along the circumferential direction along the annular connecting portion 22. In FIG. 1A, one sub fin 25 is shown on each of the left and right sides of the drawing. The sub fin 25 is formed so as to extend from the lower surface of the connecting portion 22 toward the flange portion 2b, and the tip thereof is inserted into the pool portion 2e.

  The inner side surface 25a (side surface on the rotating shaft side) of the sub fin 25 is inclined so as to be separated from the rotating shaft toward the tip. Therefore, the inner side surface 25a of the sub fin 25 guides the air flowing out from the opening 11 of the motor 3 into the pool portion 2e. Further, as shown in FIG. 1B, the circumferential side surface 25b of the sub fin 25 is inclined in the rotational direction of the fan 20 indicated by an arrow. Accordingly, the sub fin 25 of the rotating fan 20 guides the air flowing out from the opening 11 of the motor 3 into the reservoir 2e. Further, the sub fin 25 having the tip inserted into the reservoir 2e forms a bent passage (maze structure) together with the bottom and the side wall of the reservoir 2e.

The operation of the blower 1 will be described.
In the air blower 1 configured as described above, when the motor 3 rotates based on the operation of the drive circuit, the fan 20 rotates and the air blowing operation is performed. At this time, a part of the wind generated by the fan 20 flows into the diversion duct 30b as cooling air and is supplied into the motor 3 through the air passage 18a, the communication passage 17 and the through hole 4a of the yoke housing 4, and thereafter The air is discharged from the opening 11 at the top of the motor 3 that becomes negative pressure by the rotation of the fan 20. Such cooling air (indicated by an arrow in FIG. 1) is guided into the motor 3 from the air passage 18 a and passes through the motor 3, specifically inside the motor 3, specifically, the coil of the armature 7, Various motor components such as the brush 15 and the commutator 14 are cooled.

  Then, the cooling air that has cooled the inside of the motor 3 flows out from the opening 11 of the motor 3. The cooling air includes dust such as friction powder generated by the sliding contact between the commutator 14 and the brush 15. The air containing dust is guided along the inner surface of the support portion 21 of the fan 20 to the upper surface 2d of the flange portion 2b of the motor holder 2. Then, the air is guided into the accumulation portion 2e by the inner side surface 25a of the sub fin 25 formed on the fan 20 and the circumferential side surface 25b. Since the air flow hits the bottom and side walls of the reservoir 2e and the reservoir 2e and the sub fin 25 form a maze structure, dust contained in the air stays in the reservoir 2e. The amount of dust contained in the air flowing in the outer circumferential direction decreases.

  The air that has passed through the reservoir 2e hits the prevention wall 2f that is formed in a cylindrical shape radially outward from the reservoir 2e. Accordingly, dust contained in the air accumulates inside the prevention wall 2f when the air hits the prevention wall 2f. Thereby, the amount of dust contained in the air flowing in the outer peripheral direction of the fan 20 is further reduced.

As described above, the present embodiment has the following effects.
(1) In the motor holder 2, a reservoir 2 e is recessed at a location where air that has flowed out from the opening 11 of the motor 3 hits. The air flowing out from the opening 11 (cooling air) includes dust such as friction powder generated by the sliding contact between the commutator 14 and the brush 15. Such dust accumulates in the reservoir 2e. Therefore, the amount of dust contained in the air sent to the air conditioner by the fan 20 rotated by the motor 3 can be reduced.

  (2) The tip of the sub fin 25 formed on the fan 20 is disposed in the pool portion 2e. Therefore, the air that has flowed out of the motor 3 is guided by the sub fin 25 into the accumulation portion 2e. For this reason, the dust contained in the air that has flowed out of the motor 3 accumulates in the pool portion 2e, so that the amount of dust contained in the air sent to the air conditioner by the fan 20 rotated by the motor 3 can be reduced. .

  (3) Of the circumferential side surfaces of the sub fin 25, the circumferential side surface 25b on the rotational direction side is formed to be inclined with respect to the rotational direction. Accordingly, the air that has flowed out of the motor 3 is pushed into the pool portion 2e by the inclined circumferential side surface 25b. For this reason, the dust contained in the air that has flowed out of the motor 3 accumulates in the pool portion 2e, so that the amount of dust contained in the air sent to the air conditioner by the fan 20 rotated by the motor 3 can be reduced. .

  (4) The pool part 2e and the sub fin 25 constitute a curved flow path, that is, a maze structure, with respect to the air flow direction (direction along a plane perpendicular to the rotation shaft 8). Accordingly, it is possible to reduce the amount of dust flowing out from the reservoir 2e.

(Second embodiment)
Hereinafter, a second embodiment will be described with reference to the drawings.
In addition, the same code | symbol is used about the same member as 1st embodiment.

As shown in FIG. 2, a dustproof member 42 is attached inside the end cover 41.
The dustproof member 42 includes a fixed portion 42a, a partition wall portion 42b, and a suction sheet 42c. The fixing portion 42 a is formed in a cylindrical shape and is fixed inside the end cover 41.

  The partition wall 42 b is disposed on the radially outer side of the commutator (commutator) 14 and is formed so as to surround the commutator 14. More specifically, the partition wall portion 42b is formed so as to cover the portion of the commutator 14 with which the brush 15 is slidably contacted in the motor rotation axis direction (vertical direction in FIG. 2). Moreover, as shown in FIG. 3, the partition part 42b is formed in the substantially semicircle shape surrounding the commutator 14 between the brushes 15 along the circumferential direction. Accordingly, the brush 15 is inserted into the partition wall portion 42b from the slit formed between the two partition wall portions 42b, and is in sliding contact with the commutator 14.

  In the partition wall portion 42b, an adsorption sheet 42c is attached to the inner surface (diameter inner surface) facing the commutator 14. For example, the suction sheet 42c is bonded to the inner surface of the partition wall 42b. The adsorption sheet 42c is formed in a porous shape, and adsorbs dust containing a metal such as copper.

  As described above, the partition wall portion 42b of the dust-proof member 42 attached to the end cover 41 surrounds the commutator 14, and the suction sheet 42c is attached to the inner surface of the partition wall portion 42b. Accordingly, the dust 45 generated by the mechanical sliding contact between the commutator 14 and the brush 15 flies from the commutator 14 toward the partition wall portion 42b and is adsorbed by the suction sheet 42c attached to the inner surface of the partition wall portion 42b. The Therefore, the amount of dust that jumps out of the motor is reduced.

As described above, the present embodiment has the following effects.
(1) Inside the end cover 41, a dustproof member 42 having a partition wall portion 42b surrounding the commutator 14 is disposed outside the commutator 14 in the radial direction. Therefore, friction powder such as copper generated by the sliding contact between the commutator 14 and the brush 15 accumulates on the inner surface of the partition wall portion 42 b surrounding the commutator 14. As a result, the amount of friction powder flowing out from the motor can be reduced.

  (2) The suction sheet 42c is attached to the inner side surface of the partition wall portion 42b. The adsorption sheet 42c adsorbs metal powder such as copper. Therefore, the amount of friction powder flowing out from the motor can be reduced.

  (3) The adsorption sheet 42c is formed in a porous shape. Therefore, high-frequency sound (brush sound) generated by the sliding contact between the commutator 14 and the brush 15 is difficult to propagate to the outside of the motor. Therefore, it is possible to reduce noise generated by driving the motor.

  (4) The adsorption sheet 42c formed in a porous shape adsorbs water, silicon and the like. Therefore, for example, it can be reduced that water adheres to the commutator 14 and the commutator 14 and the brush 15 adhere to each other. Moreover, the malfunction (non-operation) which generate | occur | produces in a silicon atmosphere can be reduced.

  (5) The dust-proof member 42 is attached to the inside of the end cover 41, and the suction sheet 42c is attached to the inner surface of the partition wall portion 42b of the dust-proof member 42. Accordingly, since the partition wall portion 42b and the suction sheet 42c are integrally disposed in the end cover 41, the partition wall portion 42b and the suction sheet 42c can be easily disposed in the end cover.

(Third embodiment)
Hereinafter, a third embodiment will be described with reference to the drawings.
In addition, the same code | symbol is used about the same member as 1st embodiment.

  As shown in FIG. 4, the blower 50 includes a motor holder 51 for attaching the device to the air conditioner. The accommodation part 51a of the motor holder 51 is formed in a cylindrical shape, and a disc-shaped flange part 51b is formed on the outer periphery of the accommodation part 51a. The accommodating part 51a accommodates and holds the motor 3 that is a drive source of the blower 50.

  A fan 52 is fixed to the tip of the rotating shaft 8 protruding from the end cover 10 of the motor 3. A dustproof cover 53 is disposed between the motor 3 and the fan 52. The dust cover 53 is formed so as to cover the end cover 10 of the motor 3 and is held by the motor holder 51. More specifically, the dustproof cover 53 has a covering portion 53a and a fixing portion 53b. The covering portion 53 a is formed in a dome shape that covers the end cover 10, and the rotating shaft 8 of the motor 3 is inserted through the insertion hole formed in the top portion thereof. The fixing portion 53b is formed in an annular shape extending from the end of the covering portion 53a along a surface perpendicular to the rotation axis, that is, a surface parallel to the upper surface of the flange portion 2b of the motor holder 51. The fixing portion 53 b is fixed to the upper surface of the flange portion 2 b of the motor holder 51. The dust cover 53 is supported by a support portion 54 fixed to the motor holder 51.

  The dustproof cover 53 is formed in a thin plate shape (for example, a net shape) having a mesh, and is formed so that air flowing out from the motor 3 can pass therethrough. Dust such as copper contained in the air adheres to the mesh of the dust cover 53. The dust cover 53 is made of, for example, metal and connected to, for example, ground.

As described above, the present embodiment has the following effects.
(1) The motor holder 51 holds a dustproof cover 53 that covers the end cover 10 of the motor 3. The dust cover 53 is formed in a thin plate shape having a mesh, and allows air flowing out from the motor 3 to pass therethrough. Dust such as copper contained in the air adheres to the mesh of the dust cover 53. Therefore, the amount of dust contained in the air sent to the air conditioner by the fan 52 rotated by the motor 3 can be reduced.

(2) The dustproof cover 53 is made of metal and is formed in a thin plate shape having a mesh. Therefore, noise emitted from the motor to the outside can be reduced.
In addition, you may change embodiment of this invention as follows.

  In the second embodiment, the dustproof member 42 is attached to the inside of the end cover 41 and the periphery of the commutator 14 is surrounded by the partition wall portion 42b. However, the partition wall portion 42b may be formed integrally with the end cover. .

  -In 3rd embodiment, the opening part of the motor 3 (opening part of the end cover 10) should just be covered with a dust-proof cover, and the shape of a dust-proof cover may be changed suitably. Moreover, the place which fixes a dust-proof cover is not limited to the flange part 2b.

  -You may materialize combining each said form suitably. For example, the motor holder 2 having the reservoir 2e of the first embodiment is attached to the motor with the end cover 41 of the second embodiment attached, and the motor holder 2 having the reservoir 2e of the first embodiment is attached. The dust cover 53 of the third embodiment is fixed. Moreover, it replaces with the end cover 10 of 3rd embodiment, and uses the end cover 41 (the dust-proof member 42 and the adsorption sheet 42c) of 2nd embodiment. Moreover, it is set as the air blower which combined 1st-3rd embodiment.

  -In 3rd embodiment, although the adsorption sheet 42c was attached to the inner surface of the partition part 42b, you may make it attach another adsorption member to the inner surface of the partition part 42b. Further, the inner surface of the partition wall portion 42b may be an adsorbing member having a structure capable of adsorbing dust.

  DESCRIPTION OF SYMBOLS 2 ... Motor holder, 2a ... Accommodating part, 2b ... Flange part, 2e ... Reservoir part, 3 ... Motor, 4 ... Yoke housing (motor main body case), 8 ... Rotating shaft, 10 ... End cover, 11 ... Opening, 14 ... Commutator (commutator), 15 ... brush, 20 ... fan, 21, support portion, 22 ... connecting portion, 25 ... sub fin, 25a ... inside surface, 25b ... circumferential side surface, 41 ... end cover, 42 ... dustproof member, 42b ... partition wall part, 42c ... adsorption sheet (adsorption member), 51, motor holder, 51b ... flange part, 53 ... dustproof cover.

Claims (9)

A motor main body case, an opening having an opening that communicates the inside and outside of the motor, and an end cover that covers the opening of the motor main body case; and a motor that drives a rotating shaft by a brush and a commutator;
A fan mounted on a rotating shaft protruding from the end cover;
A rotating electrical machine comprising: a motor holder that holds the motor and has a reservoir portion through which air flowing out from the opening is guided by the fan.   2. The rotating electrical machine according to claim 1, wherein a fin for guiding dust generated from a sliding contact portion between the brush and the commutator to the pool portion is formed at a lower end portion of the fan.   The rotating electrical machine according to claim 2, wherein an end portion of the fin in the axial direction enters the pool portion.   The rotating electrical machine according to claim 3, wherein the fin has a side surface inclined in a rotation direction of the fan. A motor body case;
An end cover having an opening communicating with the inside and outside of the motor, and covering the opening of the motor body case;
A brush and a commutator for driving the rotating shaft;
A partition wall disposed in the end cover and surrounding the commutator;
A rotating electric machine comprising:   The rotating electrical machine according to claim 5, further comprising an adsorption member that adsorbs dust on an inner surface of the partition wall facing the commutator. A motor main body case, an opening having an opening that communicates the inside and outside of the motor, and an end cover that covers the opening of the motor main body case; and a motor that drives a rotating shaft by a brush and a commutator;
A motor holder for holding the motor;
A rotating electrical machine comprising a dustproof cover that covers the end cover and is held by the motor holder.   The rotating electrical machine according to claim 7, wherein the dustproof cover is formed in a dome shape, and an opening end portion thereof is attached to a flange portion of the motor holder.   The rotating electrical machine according to claim 8, wherein the dustproof cover is made of metal.

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