U.S. patent application number 13/813199 was filed with the patent office on 2013-05-23 for blower.
This patent application is currently assigned to PANASONIC CORPORATION. The applicant listed for this patent is Hideki Hayashi, Taichi Kadono, Satoshi Kagawa. Invention is credited to Hideki Hayashi, Taichi Kadono, Satoshi Kagawa.
Application Number | 20130129545 13/813199 |
Document ID | / |
Family ID | 46515273 |
Filed Date | 2013-05-23 |
United States Patent
Application |
20130129545 |
Kind Code |
A1 |
Kadono; Taichi ; et
al. |
May 23, 2013 |
BLOWER
Abstract
A blower includes a motor, a fan, a casing, a control circuit, a
roll pin, and a boss portion, and an end face of the boss portion
at one side inserted to the shaft is provided with a groove having
an opening and an bottom part to engaged with the roll pin, side
walls of the groove are slanted to widen from a bottom part to the
opening, the side walls have straight portions formed to confront
each other in parallel to a longitudinal direction of the shaft and
extending toward the opening from a start point corresponding to a
central axis of the roll pin, and a distance between the
confronting straight portions is equal to a diameter of the roll
pin.
Inventors: |
Kadono; Taichi; (Osaka,
JP) ; Hayashi; Hideki; (Aichi, JP) ; Kagawa;
Satoshi; (Aichi, JP) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
Kadono; Taichi
Hayashi; Hideki
Kagawa; Satoshi |
Osaka
Aichi
Aichi |
|
JP
JP
JP |
|
|
Assignee: |
PANASONIC CORPORATION
Osaka
JP
|
Family ID: |
46515273 |
Appl. No.: |
13/813199 |
Filed: |
December 19, 2011 |
PCT Filed: |
December 19, 2011 |
PCT NO: |
PCT/JP2011/007073 |
371 Date: |
January 30, 2013 |
Current U.S.
Class: |
417/423.15 |
Current CPC
Class: |
F04D 25/068 20130101;
F04D 29/263 20130101; F04D 17/16 20130101; F04D 25/088 20130101;
F04D 13/06 20130101; F04D 13/021 20130101 |
Class at
Publication: |
417/423.15 |
International
Class: |
F04D 13/02 20060101
F04D013/02; F04D 13/06 20060101 F04D013/06 |
Foreign Application Data
Date |
Code |
Application Number |
Jan 20, 2011 |
JP |
2011-009651 |
Claims
1. A blower comprising: a motor; a fan driven by the motor; a
casing that covers a circumference of the fan; a control circuit
that drives and controls the motor; a cylindrical roll pin mounted
on a shaft of the motor at right angle to an axis line of the
shaft; and a boss portion inserted into the shaft, wherein an end
face of the boss portion at one side inserted to the shaft is
provided with a groove having an opening and a bottom part engaged
with the roll pin, side walls of the groove are slanted to widen
from the bottom part to the opening, the side walls have straight
portions formed to confront each other in parallel to a
longitudinal direction of the shaft and extending toward the
opening from a start point corresponding to a central axis of the
roll pin, and a distance between the confronting straight portions
is equal to a diameter of the roll pin.
2. The blower according to claim 1 further comprising one pair of
integrated holding units that hold the shaft and one pair of
integrated pressing units that are pressed to move the holding
units, wherein the shaft has a concave slot engaged with the
holding units, a curved surface of the shaft having the concave
slot is a chamfered C-shaped surface, and a dimension of the
C-shaped surface in a longitudinal direction of the shaft is equal
to a length of the straight portion.
Description
TECHNICAL FIELD The present invention relates to a blower.
BACKGROUND ART
[0001] A blower in which a fan is detachable, a groove is formed in
a fan boss, and the groove and a roll pin are engaged with each
other to serve as a fan rotation stopper is known (for example,
refer to PTL 1).
[0002] The blower will be described below with reference to FIG. 5
that is a perspective view showing a configuration of a
conventional blower. As shown in FIG. 5, fan 101 includes boss
portion 102 at the center thereof, and includes a plurality of
blades 103 on the circumference thereof. At a center of axis of
boss portion 102, shaft hole 105 in which shaft 104 (only the shaft
is shown) of a motor is inserted and engagement groove 107 are
formed, so that fan 101 is in a rotation stopping state. After
shaft 104 is inserted into shaft hole 105, spinner 108 is rotated
and fixed to a distal end side of boss portion 102 (fixing
mechanism is not shown), and fan 101 is set in a retaining state.
Engagement groove 107 mentioned here is a groove in a direction
orthogonal to shaft hole 105, and is engaged with roll pin 106
mounted on shaft 104.
[0003] In the conventional blower as described above, roll pin 106
and engagement groove 107 collide with each other when a torque of
the motor is changed or when the motor is activated to generate
noise. As the countermeasure against the noise, a gap between roll
pin 106 and engagement groove 107 may be reduced to prevent the
collision. However, fan 101 is not easily mounted on shaft 104, and
shaft 104 is disadvantageously imperfectly mounted on fan 101.
CITATION LIST
Patent Literature
[0004] PTL 1: Unexamined Japanese Patent Publication No.
62-10532
SUMMARY OF THE INVENTION
[0005] A blower according to the present invention includes a
motor, a fan driven by the motor, a casing that covers a
circumference of the fan, a control circuit that drives and
controls the motor, a cylindrical roll pin mounted on a shaft of
the motor at right angle to an axis line of the shaft, and a boss
portion inserted into the shaft, wherein an end face of the boss
portion at one side inserted to the shaft is provided with a groove
having an opening and a bottom part to engaged with the roll pin,
side walls of the groove are slanted to widen from the bottom part
to the opening, the side walls have straight portions formed to
confront each other in parallel to a longitudinal direction of the
shaft and extending toward the opening from a start point
corresponding to a central axis of the roll pin, and a distance
between the confronting straight portions is equal to a diameter of
the roll pin.
[0006] With this configuration, since a width of an inlet port of
the groove is larger than that of the roll pin when the roll pin is
inserted into the groove, the roll pin can be easily inserted into
the groove. When the roll pin is fixed to a position where the fan
is rotated, since the width of the groove is equal to or smaller
than the diameter of the roll pin, collision noise between the
groove and the roll pin is prevented from being generated.
BRIEF DESCRIPTION OF DRAWINGS
[0007] FIG. 1 is an exploded perspective view showing a
ceiling-embedded ventilation fan including a blower according to an
embodiment of the present invention.
[0008] FIG. 2 is a diagram showing an interior of the
ceiling-embedded ventilation fan including the blower.
[0009] FIG. 3 is a detail view of a portion A in FIG. 2.
[0010] FIG. 4 is a detail view of a portion B in FIG. 2.
[0011] FIG. 5 is a perspective view showing a configuration of a
conventional blower.
DESCRIPTION OF EMBODIMENT
[0012] An embodiment of the present invention will be described
below with reference to the accompanying drawings.
Embodiment
[0013] FIG. 1 is an exploded perspective view of a ceiling-embedded
ventilation fan including a blower according to an embodiment of
the present invention, and FIG. 2 is a diagram showing an interior
of the ceiling-embedded ventilation fan including the blower. The
ceiling-embedded ventilation fan shown in FIGS. 1 and 2 is fitted
in a roof space (not shown) of a room by being embedded in the roof
space. The ceiling-embedded ventilation fan includes suction
opening 1, frame 3, motor 4, fan 5, casing 6, dressed panel 7,
control circuit 8, and circuit case 9.
[0014] Suction opening 1 mentioned here is arranged on a lower
surface of the ceiling-embedded ventilation fan and corresponds to
an opening of a ceiling board. Frame 3 configures a side surface of
the ceiling-embedded ventilation fan and has discharge opening 2.
Motor 4 is fixed to a top surface of frame 3. Fan 5 is driven by
motor 4. Casing 6 covers the circumference of fan 5. Dressed panel
7 is detachably mounted to cover the opening in the lower surface
of frame 3 from the room side. Control circuit 8 is mounted on the
top surface of frame 3 to drive and control motor 4. Circuit case 9
stores control circuit 8 therein. Blower 23 mentioned here includes
motor 4, fan 5, casing 6, control circuit 8, and circuit case
9.
[0015] FIG. 3 is a detail view of a portion A in FIG. 2, and FIG. 4
is a detail view of a portion B in FIG. 2. As shown in FIG. 3,
blower 23 according to the embodiment of the present invention
includes roll pin 13, groove 14, and boss portion 15. As shown in
FIG. 4, blower 23 includes detaching device 22 including one pair
of integrated holding units 11 and one pair of integrated pressing
units 12.
[0016] As shown in FIG. 3, roll pin 13 has a cylindrical shape, and
is mounted on shaft 10 of motor 4 at right angle to axis line 10a
of shaft 10. Boss portion 15 is arranged at the center of fan 5 and
inserted into shaft 10. Groove 14 to engage roll pin 13 with
motor-side end face 15a that is an end face of shaft 10 on an
insertion side is formed in boss portion 15. Groove 14 includes
opening 18 and bottom portion 17.
[0017] As shown in FIG. 4, pressing units 12 are pressed to move
holding portions 11. Shaft 10 is held by one pair of holding units
11. When pressing units 12 perform a nipping operation, a holding
force of holding units 11 is released to make it possible to make
fan 5 and shaft 10 detachable. A sensor-less DC motor is used as
motor 4, and control circuit 8 is a drive circuit of the DC
motor.
[0018] Since the sensor-less DC motor does not have a hall element
in motor 4, a rotor position of motor 4 is fixed by a DC excitation
mode in activation. Thereafter, the sensor-less DC motor outputs an
energization signal of forced commutation and rotates. When the
sensor-less DC motor rotates, induced voltages are generated from
coils in phases (U phase, V phase, and W phase). When a signal
showing the positive/negative of each phase terminal voltage
including an induced voltage is input as a position signal, the
energization signal of forced commutation is automatically switched
to an energization signal based on a position signal input (induced
voltage). For this reason, the sensor-less DC motor is driven by
sensor-less driving. In the DC excitation mode, since shaft 10
rotates to the left and the right, collision repeatedly occurs
between roll pin 13 and groove 14 to generate collision noise.
[0019] Since the sensor-less DC motor does not have a uniform
rotating force and repeatedly generates uneven torque due to a
cogging phenomenon, rotational movements of roll pin 13 and groove
14 do not coincide with each other. For this reason, collision
repeatedly occurs between roll pin 13 and groove 14 to generate
collision noise.
[0020] In contrast to this, as shown in FIG. 3, side wall 16 of
groove 14 is slanted to widen from bottom portion 17 of groove 14
to opening 18. In a part of side wall 16, side wall 16 has straight
portions 19 formed to confront each other in parallel to a
longitudinal direction of shaft 10 and extending toward opening 18
from a start point corresponding to central axis 13a of roll pin
13. More specifically, in FIG. 3, a part except for straight
portions 19 of side wall 16 has a gradient extending in an upper
left direction and having a small inclination. Distance 19a between
the confronting straight portions is equal to diameter 13b of the
roll pin.
[0021] As a result, when roll pin 13 is inserted into groove 14,
since a width of an inlet port of groove 14 is larger than roll pin
13, fan 5 is easily inserted into shaft 10. When roll pin 13 is
mounted at a fixing position, i.e., a position where fan 5 rotates,
the width of groove 14 is equal to or smaller than diameter 13b of
the roll pin. For this reason, a gap is eliminated between roll pin
13 and groove 14, and collision noise is not generated.
[0022] Furthermore, as shown in FIG. 4, concave slot 20 with which
holding units 11 are engaged is formed in shaft 10. A curved
surface of shaft 10 in which concave slot 20 is formed is chamfered
C-shaped surface 21. Diameter 21a in a longitudinal direction of
the shaft of the C-shaped surface is set to be equal to length 19b
of the straight portion shown in FIG. 3. As a result, when shaft 10
shown in FIG. 3 is inserted into fan 5, by a slipping force of
holding units 11 along C-shaped surface 21 shown in FIG. 4, roll
pin 13 is mounted at a position of straight portions 19.
[0023] As described above, in the blower according to the
embodiment of the present invention, collision noise between roll
pin 13 and groove 14 can be prevented from being generated, and fan
5 is easily fitted on shaft 10.
INDUSTRIAL APPLICABILITY
[0024] The present invention can be widely applied to a blower
including a fan fitting device in which a roll pin is formed on a
shaft of a motor used in a ventilation fan or the like, a groove
engaged with the roll pin is formed as a fan rotation stopper in a
boss portion of a fan.
REFERENCE MARKS IN THE DRAWINGS
[0025] 1 suction opening
[0026] 2 discharge opening
[0027] 3 frame
[0028] 4 motor
[0029] 5 fan
[0030] 6 casing
[0031] 7 dressed panel
[0032] 8 control circuit
[0033] 9 circuit case
[0034] 10 shaft
[0035] 10a axis line
[0036] 10b longitudinal direction
[0037] 11 holding unit
[0038] 12 pressing unit
[0039] 13 roll pin
[0040] 13a central axis
[0041] 13b diameter of roll pin
[0042] 14 groove
[0043] 15 boss portion
[0044] 15a motor-side end face
[0045] 16 side wall
[0046] 17 bottom part
[0047] 18 opening
[0048] 19 straight portion
[0049] 19a distance between confronting straight portions
[0050] 19b length of straight portion
[0051] 20 concave slot
[0052] 21 C-shaped surface
[0053] 21a dimension of C-shaped surface in longitudinal direction
of shaft
[0054] 22 detaching device
[0055] 23 blower
* * * * *