U.S. patent application number 13/440961 was filed with the patent office on 2013-07-04 for motor assembly for vacuum cleaner.
This patent application is currently assigned to Samsung Electro-Mechanics Co., Ltd.. The applicant listed for this patent is Han Kyung Bae, Su Bong Jang, Sang Jong Lee, Chang Hwan Park, Jin Su Seok, Hee Soo Yoon, Young Bok Yoon. Invention is credited to Han Kyung Bae, Su Bong Jang, Sang Jong Lee, Chang Hwan Park, Jin Su Seok, Hee Soo Yoon, Young Bok Yoon.
Application Number | 20130171013 13/440961 |
Document ID | / |
Family ID | 45930574 |
Filed Date | 2013-07-04 |
United States Patent
Application |
20130171013 |
Kind Code |
A1 |
Jang; Su Bong ; et
al. |
July 4, 2013 |
MOTOR ASSEMBLY FOR VACUUM CLEANER
Abstract
Disclosed herein is a motor assembly for a vacuum cleaner, the
motor assembly including: an inlet introducing air therethrough; a
motor; an impeller installed on a shaft of the motor and including
a plurality of blades disposed at predetermined intervals between a
pair of plates facing each other so that it rotates by the motor to
suck the air; a diffuser disposed at an outer side of a discharge
hole formed at an edge of the impeller; a first fan including a
plurality of blade parts disposed at predetermined intervals while
having the shaft as a concentric axis and disposed beneath the
diffuser; and an outlet discharging the air to the outside.
Inventors: |
Jang; Su Bong; (Gyunggi-do,
KR) ; Bae; Han Kyung; (Gyunggi-do, KR) ; Yoon;
Hee Soo; (Gyunggi-do, KR) ; Park; Chang Hwan;
(Gyunggi-do, KR) ; Lee; Sang Jong; (Gyunggi-do,
KR) ; Yoon; Young Bok; (Gyunggi-do, KR) ;
Seok; Jin Su; (Gyunggi-do, KR) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
Jang; Su Bong
Bae; Han Kyung
Yoon; Hee Soo
Park; Chang Hwan
Lee; Sang Jong
Yoon; Young Bok
Seok; Jin Su |
Gyunggi-do
Gyunggi-do
Gyunggi-do
Gyunggi-do
Gyunggi-do
Gyunggi-do
Gyunggi-do |
|
KR
KR
KR
KR
KR
KR
KR |
|
|
Assignee: |
Samsung Electro-Mechanics Co.,
Ltd.
Gyunggi-do
KR
|
Family ID: |
45930574 |
Appl. No.: |
13/440961 |
Filed: |
April 5, 2012 |
Current U.S.
Class: |
417/423.2 |
Current CPC
Class: |
A47L 9/00 20130101; A47L
5/22 20130101 |
Class at
Publication: |
417/423.2 |
International
Class: |
F04D 25/06 20060101
F04D025/06 |
Foreign Application Data
Date |
Code |
Application Number |
Dec 29, 2011 |
KR |
1020110146316 |
Claims
1. A motor assembly for a vacuum cleaner, the motor assembly
comprising: an inlet introducing air therethrough; a motor; an
impeller installed on a shaft of the motor and including a
plurality of blades disposed at predetermined intervals between a
pair of plates facing each other so that it rotates by the motor to
suck the air; a diffuser disposed at an outer side of a discharge
hole formed at an edge of the impeller; to a first fan including a
plurality of blade parts disposed at predetermined intervals while
having the shaft as a concentric axis and disposed beneath the
diffuser; and an outlet discharging the air to the outside.
2. The motor assembly as set forth in claim 1, wherein the blade of
the impeller and the blade part of the first fan have the same
pattern.
3. The motor assembly as set forth in claim 1, wherein the motor
includes a stator and a rotor, and a position of the rotor is fixed
onto the shaft using upper and lower stoppers.
4. The motor assembly as set forth in claim 1, wherein the first
fan is disposed on an outer peripheral surface of an upper
stopper.
5. The motor assembly as set forth in claim 1, wherein the first
fan includes the plurality of blade parts disposed at predetermined
intervals between a pair of upper and lower plates facing each
other while having the shaft as the concentric axis.
6. The motor assembly as set forth in claim 1, wherein an upper
plate of the first fan includes an opening part formed at the
center thereof.
7. A motor assembly for a vacuum cleaner, the motor assembly
comprising: an inlet introducing air therethrough; a motor; an
impeller installed on a shaft of the motor and including a
plurality of blades disposed at predetermined intervals between a
pair of plates facing each other so that it rotates by the motor to
suck the air; a diffuser disposed at an outer side of a discharge
hole formed at an edge of the impeller; a second fan including a
plurality of blade parts disposed at predetermined intervals while
having the shaft as a concentric axis and disposed beneath the
motor; and an outlet discharging the air to the outside.
8. The motor assembly as set forth in claim 7, further comprising a
first fan including a plurality of blade parts disposed at
predetermined intervals while having the shaft as the concentric
axis and disposed beneath the diffuser.
9. The motor assembly as set forth in claim 7, wherein the blade
part of the second fan has the same pattern as that of the blade of
the impeller.
10. The motor assembly as set forth in claim 7, wherein the blade
part of the second fan has the same pattern as that of a blade part
of a first fan.
11. The motor assembly as set forth in claim 7, wherein the motor
includes a stator and a rotor, and a position of the rotor is fixed
onto the shaft using upper and lower stoppers.
12. The motor assembly as set forth in claim 7, wherein the second
fan is disposed on an outer peripheral surface of a lower
stopper.
13. The motor assembly as set forth in claim 8, wherein the first
fan is disposed on an outer peripheral surface of an upper
stopper.
14. The motor assembly as set forth in claim 7, wherein the second
fan is disposed at a height equal to or higher than that of the
outlet.
15. The motor assembly as set forth in claim 7, wherein the first
fan includes the plurality of blade parts disposed at predetermined
intervals between a pair of upper and lower plates facing each
other while having the shaft as the concentric axis, the second fan
includes the plurality of blade parts disposed at predetermined
intervals between a pair of upper and lower plates facing each
other while having the shaft as the concentric axis, and each of
upper plates of the first fan and the second fan includes an
opening part formed at the center thereof.
Description
CROSS REFERENCE TO RELATED APPLICATION
[0001] This application claims the benefit of Korean Patent
Application No. 10-2011-0146316, filed on Dec. 29, 2011, entitled
"Motor Assembly for Vacuum Cleaner", which is hereby incorporated
by reference in its entirety into this application.
BACKGROUND OF THE INVENTION
[0002] 1. Technical Field
[0003] The present invention relates to a motor assembly, and more
particularly, to a motor assembly capable of being used in a vacuum
cleaner.
[0004] 2. Description of the Related Art
[0005] A vacuum cleaner, which is a device converting electrical
energy into mechanical rotational movement to partially generate
vacuum, thereby collecting external foreign materials such as dust,
includes a motor assembly in order to generate the vacuum.
[0006] An example of this motor assembly is disclosed in Patent
Document 1. Patent Document 1 (Korean Patent No 10-0633431) has
disclosed "Impeller and Motor Assembly having the Same".
[0007] The motor assembly disclosed in Patent Document 1 is
configured to include a motor, an impeller, and a diffuser as well
known previously.
[0008] Schematically, when the motor assembly according to the
prior art is applied with external power, a motor having a rotor
rotating with respect to a stator by electromagnetic force rotates
to forcibly rotate an impeller installed at an upper end of a shaft
of the motor, thereby sucking air. In addition, this motor assembly
guides the air sucked into the impeller to an inner portion of the
motor assembly while reducing a speed of the air.
[0009] The motor assembly according to the prior art disclosed in
Patent Document 1 sucks the air into the motor assembly in the
vacuum cleaner at a rapid speed using the impeller. In this case,
the motor assembly cannot but generate heat. The motor assembly in
a heat generating state is cooled through the air to be introduced
into the impeller. However, since the air is guided to the inner
portion of the motor assembly in a state in which a speed thereof
is significantly reduced through the diffuser, it is not rapidly
discharged from an inner portion of the motor to an outer portion
thereof, such that the motor assembly may not be effectively
cooled.
[0010] In addition, since the diffuser should forcibly guide the
air to be sucked into the impeller to the inner portion of the
motor assembly, channel loss occurs, such that rotational
performance of the impeller may be deteriorated.
[0011] In order to solve this problem, Patent Document 2 suggests
"Motor combined with fan". In Patent Document 2, a suction fan
sucking air is installed at a lower end of a shaft of a motor.
[0012] In the motor having this structure, the suction fan is
generally installed so as to be spaced apart from an inlet provided
in an upper portion of the motor by a predetermined distance. More
specifically, the suction fan is disposed at a lower portion of the
motor including a stator and a rotor. That is, the suction fan is
rotated through rotational driving of the motor to suck the air
through the inlet, and the sucked air is discharged to the outside
through a scroll of the suction fan while traversing the motor to
cool the motor.
[0013] However, the motor disclosed in Patent Document 2 includes
the suction fan installed at the lower portion thereof. This
suction fan has a diameter larger than that of the motor, such that
it is difficult to adopt the motor in a vacuum cleaner having a
limited internal space.
[0014] Another scheme capable of solving the problems as described
above should be considered.
PRIOR ART DOCUMENT
[0015] [Patent Document] [0016] Patent Document 1: Korean Patent
No. 10-0633431 [0017] Patent Document 2: Korean Patent Laid-Open
Publication No. 10-2002-0043278
SUMMARY OF THE INVENTION
[0018] The present invention has been made in an effort to provide
a motor assembly capable of guiding air sucked into an impeller to
an inner portion thereof without reducing a speed of the air.
[0019] According to a first embodiment of the present invention,
there is provided a motor assembly for a vacuum cleaner, the motor
assembly including: an inlet introducing air therethrough; a motor;
an impeller installed on a shaft of the motor and including a
plurality of blades disposed at predetermined intervals between a
pair of plates facing each other so that it rotates by the motor to
suck the air; a diffuser disposed at an outer side of a discharge
hole formed at an edge of the impeller; a first fan including a
plurality of blade parts disposed at predetermined intervals while
having the shaft as a concentric axis and disposed beneath the
diffuser; and an outlet discharging the air to the outside.
[0020] The blade of the impeller and the blade part of the first
fan may have the same pattern. The blades of the impeller and the
blade parts of the first fan may have a spiral shape with the same
curvature and may be formed to have the same number.
[0021] The motor may include a stator and a rotor, and a position
of the rotor may be fixed onto the shaft using upper and lower
stoppers.
[0022] The first fan may be disposed between the diffuser and the
motor, and more preferably, be disposed on an outer peripheral
surface of the upper stopper.
[0023] The first fan may include the plurality of blade parts
disposed at predetermined intervals between a pair of upper and
lower plates facing each other while having the shaft as the
concentric axis, similar to the impeller, and an upper plate of the
first fan may include an opening part formed at the center
thereof.
[0024] The upper plate of the first pan may include the opening
part to allow the shaft to penetrate therethrough and allow the air
guided from the diffuser to be sucked.
[0025] According to a second embodiment of the present invention,
there is provided a motor assembly for a vacuum cleaner, the motor
assembly including: an inlet introducing air therethrough; a motor;
an impeller installed on a shaft of the motor and including a
plurality of blades disposed at predetermined intervals between a
pair of plates facing each other so that it rotates by the motor to
suck the air; a diffuser disposed at an outer side of a discharge
hole formed at an edge of the impeller; a second fan including a
plurality of blade parts disposed at predetermined intervals while
having the shaft as a concentric axis and disposed beneath the
motor; and an outlet discharging the air to the outside.
[0026] The motor assembly may further include a first fan including
a plurality of blade parts disposed at predetermined intervals
while having the shaft as the concentric axis and disposed beneath
the diffuser.
[0027] The blade of the impeller, a blade part of a first fan,
and/or the blade part of the second fan may have the same pattern.
That is, the blades and the blade parts may have a spiral shape
with the same curvature and may be formed to have the same
number.
[0028] The motor may include a stator and a rotor, and a position
of the rotor may be fixed onto the shaft using upper and lower
stoppers.
[0029] The first fan may be disposed between the diffuser and the
motor, and more preferably, be disposed on an outer peripheral
surface of the upper stopper.
[0030] The second fan may be disposed beneath the motor, and more
preferably, be disposed on an outer peripheral surface of a lower
stopper.
[0031] The second fan may be disposed at a height equal to or
higher than that of the outlet.
[0032] The outlet may be formed at an outer side of the second fan
in order to rapidly discharge the air to be discharged at a high
speed to the outside so that the air to be discharged to an edge of
the second fan is not re-guided or re-circulated to an inner
portion of the motor assembly.
[0033] The second fan may include the plurality of blade parts
disposed at predetermined intervals between a pair of upper and
lower plates facing each other while having the shaft as the
concentric axis, similar to the impeller, and an upper plate of the
second fan may includes an opening part formed at the center
thereof.
BRIEF DESCRIPTION OF THE DRAWINGS
[0034] FIG. 1 is a longitudinal cross-sectional view of a motor
assembly according to a first preferred embodiment of the present
invention;
[0035] FIG. 2 is a perspective view of a first fan coupled onto a
shaft shown in FIG. 1;
[0036] FIG. 3 is a plan view of the first fan shown in FIG. 2;
[0037] FIG. 4 is a longitudinal cross-sectional view of a motor
assembly according to a second preferred embodiment of the present
invention;
[0038] FIG. 5 is a perspective view of first and second fans
coupled onto a shaft shown in FIG. 4; and
[0039] FIG. 6 is a bottom view of the second fan shown in FIG.
4.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
[0040] The terms and words used in the present specification and
claims should not be interpreted as being limited to typical
meanings or dictionary definitions, but should be interpreted as
having meanings and concepts relevant to the technical scope of the
present invention based on the rule according to which an inventor
can appropriately define the concept of the term to describe most
appropriately the best method he or she knows for carrying out the
invention.
[0041] Hereinafter, a motor assembly according to preferred
embodiments of the present invention, particularly, a motor
assembly for a vacuum cleaner will be described in detail with
reference to the accompanying drawings.
[0042] Various advantages and features of the present invention and
methods accomplishing thereof will become apparent from the
following description of embodiments with reference to the
accompanying drawings. In the present specification, in adding
reference numerals to components shown in each of the accompanying
drawings, it is to be noted that like reference numerals designate
like or similar components throughout the specification. Further,
in the present specification, when a detailed description of the
known art related to the present invention obscure the gist of the
present invention, the detailed description thereof will be
omitted.
[0043] FIG. 1 is a longitudinal cross-sectional view of a motor
assembly according to a first preferred embodiment of the present
invention.
[0044] As shown, the motor assembly 1 according to the first
preferred embodiment of the present invention is configured to
include a motor 10, an impeller 20, a diffuser 30, and a first fan
40.
[0045] The motor 10 includes a stator 11 and a rotor 12 as well
known in the art previously and rotate the rotor 12 disposed to
face the stator 11 in the case in which current is applied from the
outside thereto. Since the rotor 12 is disposed on a shaft 13 of
the motor 10, rotation of the rotor 12 is transferred to the shaft
13 to provide rotational driving of the motor 10.
[0046] Particularly, the motor 10 includes an upper stopper 14a
provided on an upper portion of the rotor 12 and a lower stopper
14b provided on a lower portion of the rotor 12.
[0047] The upper stopper 14a is disposed on the upper portion of
the rotor 12 and fixes positions of the rotor 12 and the shaft 13.
Similarly, the lower stopper 14b is disposed on the lower portion
of the rotor 12 and fixes the position of the rotor 12 and the
shaft 13.
[0048] The impeller 20 is coupled to an upper end of the shaft 13,
such that rotational movement of the rotor 12 is transferred to the
impeller 20 coupled to the shaft 13. Rotational movement of the
impeller 20 provides centrifugal force around the impeller 20. This
centrifugal force allows air outside an inlet to be sucked while
discharging air positioned at the center of the impeller 20 to an
edge of the impeller 20, that is, in an outward direction. The
impeller 20 includes upper and lower plates spaced apart from each
other by a predetermined interval while having the shaft 13 as a
concentric axis, and blades 22 provided between the upper and lower
plates. Each of the blades 22 is disposed at predetermined
intervals between the upper and lower plates in a radial direction
and has a curved shape with a predetermined curvature. The center
of the upper plate is provided with an introduction path of the air
to be introduced by the rotational movement of the impeller 20.
[0049] The impeller 20 is fixed to the shaft 13 penetrating through
the center of the lower plate and includes a plurality of blades 22
arranged on the lower plate.
[0050] Each of the plurality of blades 22 has a blade pattern in
which it is extended in a radial spiral shape from the rotation
center (for example, the shaft 13) of the lower plate in the
outward direction, as well known previously to those skilled in the
art. This impeller 20 includes the plurality of blades 22 each
having the curved shape with a predetermined curvature. The number
and the curvature of blades according to the preferred embodiment
of the present invention may be changed as needed.
[0051] The diffuser 30 is arranged at an outer side of the impeller
20 so as to be spaced apart from the impeller 20 by a predetermined
interval so that the impeller 20 may rotate. The diffuser 30 guides
the air introduced at a high speed through the inlet 2 by the
rotation of the impeller 20 to an inner portion of the motor
assembly 1.
[0052] As described above, the diffuser 30 is designed to forcibly
guide the air discharged in the radial direction by the impeller 20
toward the inner portion of the motor assembly 1 without directly
impacting an inner side wall of a housing of the motor assembly 1,
such that channel loss occurs.
[0053] This channel loss significantly reduces the air speed,
thereby deteriorating cooling performance of the motor assembly
1.
[0054] Therefore, the motor assembly 1 is characterized in that it
includes the first fan 40 capable of supplementing the channel
loss. Particularly, the first fan 40 according the preferred
embodiment of the present invention increases the reduced speed of
the air, thereby making it possible to effectively cool heat
generated in the motor 10.
[0055] Particularly, in the motor assembly 1 according to the
preferred embodiment of the present invention, the first fan 40 is
disposed between the diffuser 30 and the motor 10. More
specifically, the first fan 40 is disposed on an outer peripheral
surface of the upper stopper 14a of the motor 10.
[0056] The first fan 40 includes a plurality of blade parts each
formed in a blade shape on the upper stopper 14a while having the
shaft 13 as a concentric axis.
[0057] The blade parts of the first fan 40 are disposed at
predetermined intervals in the radial direction on the outer
peripheral surface of the upper stopper 14a. Further, each of
individual blade parts of the first fan 40 has a curved shape with
a predetermined curvature.
[0058] Particularly, since the blade part of the first fan 40 has
the same structure as that of the blade 22 of the impeller 20, it
may suck and/or move the air at a high speed, almost similar to the
impeller 20. That is, a flow direction of the air discharged from
the impeller 20 is forcibly changed through the diffuser 30, such
that the channel loss is caused. However, the air guided to the
diffuser 30 may recover its speed by rotational movement of the
first fan 40.
[0059] Although not shown, as another example of the first fan 40
according to the first preferred embodiment of the present
invention, the first fan 40 is formed to be similar to the impeller
20. More specifically, the first fan may also include upper and
lower plates arranged to be spaced apart from each other by a
predetermined interval while having the shaft 13 or the upper
stopper 14a as a concentric axis and blade parts provided between
the upper and lower plates.
[0060] The lower plate has a disk shape, and the upper plate has a
disk plate corresponding to that of the lower plate and includes an
opening part formed at the center thereof.
[0061] This exemplary first fan is disposed between the diffuser 30
and the motor 10. More specifically, the first fan may also be
disposed beneath the diffuser 30.
[0062] The blade parts of the first fan may be disposed at
predetermined intervals in the radial direction simultaneously with
being disposed between the upper and lower plates to fix positions
of the upper and lower plates. In addition, each of the blade parts
has a curved shape with the same curvature as that of the blade 22
of the impeller 20.
[0063] When external power is supplied to the motor assembly 1
according to the preferred embodiment of the present invention
configured as described above, the rotational driving of the motor
10 is transferred to the shaft 13, and the rotational movement of
the shaft 13 is transferred to the impeller 20 coupled to the shaft
13.
[0064] The impeller 20 sucks the air in the vicinity of the inlet 2
while rotating in the above-mentioned scheme. That is, the air
passes through the introduction path of the upper plate to thereby
be sucked into the impeller 20 and is then discharged toward the
edge, by the centrifugal force of the impeller 20. Then, the air is
forcibly guided toward the inner portion of the motor assembly 1
via the diffuser 30 arranged at an outer side of the impeller
20.
[0065] As described above, the first fan 40 is also coupled to the
shaft 13 or the upper stopper 14a of the motor 10 to rotate in the
same scheme as the rotation scheme of the impeller 20, thereby
applying the centrifugal force to the air guided to the diffuser
30. Therefore, a speed of the air introduced into the motor
assembly may increased to the same level as that of the air in the
impeller 20 and a flow amount of the air may be recovered.
[0066] The air introduced through the first fan 40 is discharged to
the inner portion of the motor assembly 1. This air may efficiently
cool heat generated in the motor assembly while moving in an
internal space of the motor assembly 1 at a high speed, and waste
heat exits through an outlet 3.
[0067] FIG. 2 is a bottom view of a first fan included in the motor
assembly according to the first preferred embodiment of the present
invention; and FIG. 3 is a plan view of the first fan shown in FIG.
2.
[0068] As shown, the first fan 40 is fixed to the upper stopper 14a
of the rotor 12 based on the shaft 13 and includes the plurality of
blade parts arranged in a circumferential direction on the outer
peripheral surface of the upper stopper 14a.
[0069] Each of the plurality of blade parts has a blade part
pattern in which it is extended in a radial spiral shape from, for
example, the shaft 13 or the upper stopper 14a in the outward
direction, Here, the terms "pattern" means that the blade parts are
arranged to have a predetermined number and a predetermined spiral
shape.
[0070] As described above, the first fan 40 rapidly sucks the air
in which the channel loss is generated due to the diffuser, thereby
making it possible to increase a heat radiation effect in the motor
assembly and improve suction force of the impeller.
[0071] In other words, the motor assembly according to the
preferred embodiment of the present invention has the blade part
pattern that is the same as the blade pattern of the impeller 20
(See FIG. 1). That is, the number and the spiral shape of blades
included in the impeller are the same as those of blade parts
included in the first fan 40.
[0072] The impeller 20 (See FIG. 1) and the first fan 40 that have
the same rotational speed may allow a speed of the air discharged
to the impeller and a speed of the air discharged to the first fan
to be the same as each other due to the blade and the blade part
that have the same pattern.
[0073] FIG. 4 is a longitudinal cross-sectional view of a motor
assembly according to a second preferred embodiment of the present
invention; FIG. 5 is a perspective view of first and second fans
coupled onto a shaft shown in FIG. 4; and FIG. 6 is a bottom view
of the second fan shown in FIG. 4.
[0074] As shown, the motor assembly 1 according to the second
preferred embodiment of the present invention is configured to
include a motor 10, an impeller 20, a diffuser 30, a first fan 40,
and a second fan 50.
[0075] The motor assembly 1 according to the preferred embodiment
of the present invention shown in FIG. 4 is similar to the motor
assembly 1 shown in FIG. 1 except for the second fan. Therefore, in
order to assist in clear understanding of the present invention, a
description of components that are the same as or similar to the
above-mentioned components will be omitted.
[0076] The motor assembly 1 according to the second preferred
embodiment of the present invention is characterized in that it
include the first and second fans 40 and 50 capable of
supplementing channel loss due to the diffuser 30. Particularly,
the first fan 40 according to the second preferred embodiment of
the present invention may increase a speed of air reduced due to
the diffuser 30 to effectively cool heat generated in the motor 10,
and the second fan 50 according to the second preferred embodiment
of the present invention may suck air staying in the motor assembly
1 to rapidly discharge the air to the outside.
[0077] As shown, the first fan 40 may be disposed between the
diffuser 30 and the motor 10 and be preferably disposed on an outer
peripheral surface of the stopper 14a.
[0078] In addition, the second fan 50 may be disposed beneath the
motor 10. Preferably, the second fan 50 may also be disposed on an
outer peripheral surface of the lower stopper 14b of the motor
10.
[0079] The second fan 50 according to the second preferred
embodiment of the present invention includes a blade part pattern
in which it is extended in a radial spiral shape from the rotation
center (for example, the shaft 13 or the lower stopper 14b) in the
outward direction, similar to the first fan 40 and has a
predetermined curvature.
[0080] Since the second fan 50 has the same structure as that of
the first fan 40 as described above, it may rapidly suck the air
guided to the inner portion of the motor assembly 1 through the
first fan 40. That is, relatively low temperature air to be
supplied to the first fan 40 contacts high heat generated in an
internal component of the motor assembly 1, that is, the motor 10,
to cool the inner portion of the motor assembly 1. The second fan
50 is disposed beneath the motor 10 as shown, thereby making it
possible to rapidly discharge air staying in the motor assembly 1
to the outside. The motor assembly 1 according to the second
preferred embodiment of the present invention may include the
second fan as a necessary component and include the first fan
described in the first preferred embodiment of the present
invention as a selective component.
[0081] Although not shown, as another example of the second fan 50
according to the second preferred embodiment of the present
invention, the second fan 50 is formed to be similar to the
impeller 20. More specifically, the second fan may also include
upper and lower plates arranged to be spaced apart from each other
by a predetermined interval while having the shaft 13 or the lower
stopper 14b as a concentric axis and blade parts provided between
the upper and lower plates.
[0082] The lower plate has a disk shape, and the upper plate has a
disk plate corresponding to that of the lower plate and includes an
opening part formed at the center thereof.
[0083] This exemplary second fan may also be disposed based on the
shaft 13 beneath the motor 10.
[0084] The blade parts of the second fan may be disposed at
predetermined intervals in the radial direction simultaneously with
being disposed between the upper and lower plates to fix positions
of the upper and lower plates, similar to the first fan described
above. In addition, each of the blade parts has a curved shape with
the same curvature as that of the blade 22 of the impeller 20.
[0085] It is preferable that since the second fan 50 may suck the
air staying in the motor assembly 1 to discharge the sucked air to
the outside, an edge of the second fan 50 is disposed in the
vicinity of an outlet 3 of the motor assembly 1. The edge of the
second fan 50 and the outlet 3 are disposed at the same height so
that the air discharged from the second fan 50 at a high speed may
be rapidly discharged to the outside without being re-guided to the
inner portion of the motor assembly 1.
[0086] In the case in which the motor assembly 1 according to the
second preferred embodiment of the present invention is supplied
with external power, it operates as described below, thereby making
it possible to improve a heat radiation effect as well as suction
force of the air.
[0087] When the external power is supplied to the motor assembly 1,
rotational driving of the motor 10 is transferred to the impeller
20.
[0088] The impeller 20 sucks the air in the vicinity of the inlet 2
while rotating. Then, the air is forcibly guided toward the inner
portion of the motor assembly 1 via the diffuser 30 arranged at an
outer side of the impeller 20.
[0089] The first fan 40 is also coupled to the shaft 13 or the
upper stopper 14a of the motor 10 to rotate in the same scheme as
the rotation scheme of the impeller 20, thereby making it possible
to increase a speed of the air reduced due to the diffuser 30 to
the same level as that of the air in the impeller 20 and recover a
flow amount of the air.
[0090] The air introduced through the first fan 40 is discharged to
the inner portion of the motor assembly 1, such that it contacts
heat generated in an internal space of the motor assembly 1.
[0091] Then, the air staying in the internal space of the motor
assembly 1 is sucked through the rotational driving of the second
fan 50 and is discharged to the outlet 3, thereby radiating the
heat of the motor assembly 1.
[0092] As set forth above, according to the preferred embodiments
of the present invention, it is possible to increase a speed of the
air to be guided to the inner portion of the motor assembly.
[0093] Particularly, according to the preferred embodiments of the
present invention, the speed of the air is increased, thereby
making it possible to significantly reduce a time in which the air
stays in the motor.
[0094] Since the motor assembly according to the preferred
embodiments of the present invention does not require a separate
space in which the fan is additionally to be mounted, it may be
used as the motor assembly mounted in a limited space such as a
vacuum cleaner.
[0095] In addition, according to the preferred embodiments of the
present invention, the air sucked at a high speed is discharged to
the outside simultaneously with contacting high heat generated in
the motor assembly, thereby making it possible to maximize a heat
radiation effect of the motor assembly.
[0096] Although the preferred embodiments of the present invention
has been described above with reference to the accompanying
drawings, it will be appreciated that a motor assembly according to
the invention is not limited thereto, and those skilled in the art
will appreciate that various modifications and alterations are
possible, without departing from the scope and spirit of the
invention described in the claims.
* * * * *