US2008196266A1PendingUtilityA1
Ductless dryer
Est. expiryFeb 20, 2027(~0.6 yrs left)· nominal 20-yr term from priority
Inventors:Han-Yong JungSeung-Phyo AhnSang-Ik LeeKyung Mun JungYoon-Seob EomYang-Ho KimJea Hyuk WeeByeong-Jo RyooSung-Ho Song
D06F 58/00D06F 58/04D06F 58/20
46
PatentIndex Score
0
Cited by
0
References
0
Claims
Abstract
A ductless dryer includes a main body, a drum rotatably installed at the main body, a heat exchanger for removing moisture from air exhausted from the drum, a circulation duct to flow the air exhausted from the drum into the heat exchanger, an exhaust duct to flow the air exhausted from the heat exchanger outside the dryer; and a noise reduction portion to attenuate noise propagation through the exhaust duct. As the ductless dryer is provided with the noise reduction portion, the noise propagation through the exhaust duct exposed into the room and the noise of the entire ductless dryer can be attenuated at the same time, whereby a quieter room environment can be provided.
Claims
exact text as granted — not AI-modified1 . A ductless dryer, comprising:
a main body; a drum rotatably installed at the main body; a heat exchanger for removing moisture included in air which has been exhausted from the drum; a circulation duct communicating the air exhausted from the drum into the heat exchanger; an exhaust duct communicating the air exhausted from the heat exchanger outside the dryer; and a noise reduction portion attenuating noise propagation through the exhaust duct.
2 . The ductless dryer of claim 1 , wherein the noise reduction portion is installed between the circulation duct and the heat exchanger.
3 . The ductless dryer of claim 2 , wherein the noise reduction portion is connected in line with the heat exchanger.
4 . The ductless dryer of claim 1 , wherein the noise reduction portion has first, second and third pipes which are sequentially connected, and a cross-sectional area of the second pipe is larger than the cross-sectional areas of the first and the third pipes.
5 . The ductless dryer of the claim 4 , wherein the first and the third pipes have the same cross-sectional area as each other.
6 . The ductless dryer of claim 5 , wherein a noise loss transfer function (LT) of the noise reduction portion is determined by the following formula:
L
T
=
10
log
10
(
I
2
T
2
)
=
10
log
10
[
1
+
1
4
(
A
1
A
2
-
A
2
A
1
)
2
sin
2
(
wl
c
)
]
wl
c
=
2
π
fl
c
=
2
n
-
1
2
π
l
=
1
4
c
f
1
wherein, I: noise level at an inlet of the second pipe T: noise level at an outlet of the second pipe A 1 : cross-sectional areas of the first and the third pipes A 2 : a cross-sectional area of the second pipe l: length of the second pipe c: speed of sound f: frequency n=1, 2, 3 . . . f 1 : target noise frequency (n=1).
7 . The ductless dryer of claim 1 , wherein the noise reduction portion comprises:
an inner pipe; and an outer pipe enclosing at least a part of the inner pipe to form a space therebetween, wherein the inner pipe is provided with a plurality of openings therein in communication with the space.
8 . The ductless dryer of claim 7 , wherein the outer pipe entirely encloses the inner pipe.
9 . The ductless dryer of claim 7 , wherein an enclosing angle (θ) of the inner pipe by the outer pipe is 120° or less.
10 . The ductless dryer of claim 7 , wherein the outer pipe comprises:
an outer wall enclosing the inner pipe and being spaced therefrom in a radial direction; and end walls forming the space by closing front and rear ends of the outer wall.
11 . The ductless dryer of claim 7 , wherein a target noise resonant frequency to be attenuated through the noise reduction portion is determined by the following
f
res
=
5000
p
l
(
t
+
0.8
d
)
formula:
wherein, p: percentage of the area of the openings in the area of the inner pipe forming the interior of the space
l: separation distance between the inner pipe and the outer pipe
t: thickness of the inner pipe
d: diameter of the noise opening
f res : target noise resonant frequency.
12 . A ductless dryer having an exhaust duct, comprising a noise reduction portion attenuating noise propagation through the exhaust duct.
13 . The ductless dryer of claim 12 , wherein the noise reduction portion is connected in line with a heat exchanger of the dryer.
14 . The ductless dryer of claim 12 , wherein the noise reduction portion has first, second and third pipes which are sequentially connected, and a cross-sectional area of the second pipe is larger than the cross-sectional areas of the first and third pipes.
15 . The ductless dryer of claim 14 , wherein the first and the third pipes have the same cross-sectional area with each other.
16 . The ductless dryer of claim 12 , wherein the noise reduction portion comprises:
an inner pipe; and an outer pipe enclosing at least a portion of the inner pipe to form a space therebetween, wherein the inner pipe is provided with a plurality of noise openings thereon in communication with the noise space.
17 . The ductless dryer of claim 16 , wherein the outer pipe entirely encloses the inner pipe.
18 . The ductless dryer of claim 17 , wherein an enclosing angle (θ) of the outer pipe with respect to the inner pipe is 120° or less.
19 . The ductless dryer of claim 16 , wherein the outer pipe comprises:
an outer wall enclosing the inner pipe and being spaced therefrom in a radial direction; and end walls forming the space by closing front and rear ends of the outer wall.Join the waitlist — get patent alerts
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