Acoustics – Sound-modifying means – Methods
Reexamination Certificate
1998-04-17
2001-04-17
Seidleck, James J. (Department: 1711)
Acoustics
Sound-modifying means
Methods
C181S208000, C181S175000, C181S204000, C181S207000, C181S224000, C181S294000, C181S403000, C522S096000, C522S174000, C427S371000, C427S332000, C427S508000
Reexamination Certificate
active
06216817
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a damping structural substance and a damping coat forming method to be applied to air conditioners etc.
2. Description of the Prior Art
An air conditioner, as shown in
FIG. 5
, is composed of an outdoor unit
10
, an indoor unit
20
and main pipings consisting of a high pressure piping
31
and a low pressure piping
32
, both connecting the outdoor unit
10
and the indoor unit
20
, and these components and parts compose a closed circuit in which an operating gas is enclosed.
The outdoor unit
10
is composed of such main components as a compressor
11
, a four-way valve
12
, a heat exchange device
13
including of a heat exchanger
131
and a fan
132
, a silencer
14
, a cooling capillary tube
15
, an accumulator
16
, a check valve
17
, operational valves
181
,
182
, etc., and these components are contained within an outer shell structure
19
.
The indoor unit
20
is composed of such main components as a heat exchange device
21
including of a heat exchanger
211
and an indoor side fan
212
, a heating capillary tube
22
, a check valve
23
, etc., and these components are contained within an outer shell structure
28
.
In the outdoor unit
10
, as shown in
FIG. 6
, there are disposed a high density of various components, parts and pipings including many loop pipings and serpentine pipings. As for the capillary tube
15
, in which a long tube of small inner diameter is used, the thin diameter portion is wound in loop shapes for the purpose of vibration prevention and good space arrangement.
The indoor unit
20
is, as shown in
FIG. 7
, composed of a bottom shell
191
, a rear shell
192
, front shells
193
,
195
and a side shell
194
. The pipings therein, having less components and parts, are not so complicated as in the outdoor unit
10
and are not shown, but a point that a capillary tube
22
consisting of a thin tube of loop shapes is disposed is same as in the outdoor unit
10
.
A description is made below of a cooling operation and a heating operation of the air conditioner mentioned above. In the case of a cooling operation, a high temperature, high pressure gas compressed by said compressor
11
enters into the outdoor heat exchanger
131
via the four-way valve
12
, is cooled to become a condensate, and is decompressed at the cooling capillary tube
15
, and then is evaporated and gasified within the indoor heat exchanger
211
and is sucked into the compressor
11
via the four-way valve
12
, thus a cycle is completed.
On the other hand, in case of a heating operation, the high temperature, high pressure gas compressed by the compressor
11
enters into the indoor heat exchanger
211
via the four-way valve
12
, is cooled to become a condensate, and is decompressed at the heating capillary tube
22
, and then is evaporated and gasified within the outdoor heat exchanger
131
and is sucked into the compressor
11
via the four-way valve
11
, thus a cycle is completed.
In recent years, attempts are being made for realization of compact sizing and noise reduction of an air conditioner having such refrigeration cycle as mentioned above, but as the compact sizing and the noise reduction include a mutually contradictory contents, solving both problems at one time is very difficult.
In the conventional air conditioner, therefore, for a purpose of prevention of vibration transmission from the compressor
11
, which is one vibration source, to the refrigeration cycle lines and for a purpose of prevention of refrigerant sound transmission caused at the time of phase changes of the refrigerant circulating in the refrigeration cycle, a damping member
9
of sheet shape wound around a piping
8
and a capillary tube
5
, as shown in
FIG. 8
, is used.
The vibrations from the vibration source of the compressor
11
etc. are transmitted to the shell structures via supporting members, vibrate the sheets and become a cause to increased the noise of the unit. And the vibration substance generates air vibrations and causes a noise radiation.
The method of attaching the damping member
9
of sheet shape to the vibration substance for prevention of piping vibrations or sheet vibrations and for causing damping actions in the vibration substance is usually used not only for damping of piping units of loop shapes as mentioned above but also for damping of sheets.
In the conventional air conditioner, as mentioned above, the damping member of sheet shape wound around the piping and the capillary tube is used, however, in the damping member if used, there occur spaces between the piping and the capillary tube, by which a vibration absorption and sound absorption effect is lowered and according to the state of pressing by the winding of the damping member, there arises an a non-uniformity in the vibration absorption and noise absorption effect, and further accompanied with the compact sizing of air conditioner, the wound damping member touches the inner components and parts of the air conditioning unit, which cause unusual sounds and damages the pipings etc. Thus, there are shortcomings including those mentioned above in the prior art.
As one countermeasure to dissolve the shortcomings, there is a device disclosed by the Japanese laid-open utility model application No. Sho 60(1985)-68367. This relates, as shown in
FIG. 9
, to a damping structural substance
14
formed on a piping unit
17
by this piping unit
17
, consisting of a piping
11
and a capillary tube
12
, being dipped in, and drawn up from, a liquid rubber resin
13
filled in a vessel
16
. This device requires, however, a long time for hardening of the resin
13
and has a problem in practical use.
SUMMARY OF THE INVENTION
In view of the problems of devices in the prior art, the present invention is disclosed with an object to provide a damping structural substance and a damping coat forming method which, being excellent in a vibration absorption and sound absorption effect and in compact sizing and productivity, are suitable for vibration prevention, and for noise reduction based on the vibration prevention, not only of piping units in an air conditioner but also of pipings in general structures such as straight pipes, serpentine pipes etc. or of sheet surfaces of shell structures forming outer shapes of structures e.g., a capillary tube, a piping unit containing such tube or a loop pipe.
(1) A damping structural substance of the present invention is characterized in that a damping coat consisting of a high molecular material of damping nature mixed with a photopolymerization initiator for causing a hardening reaction by a light irradiation is formed on the surface of a structure to be damped.
In the above, the damping coat, consisting of a high molecular material of damping nature, formed by a light irradiation on the surface of a structure to be damped is a coat of viscoelasticity nature with no restraint in which the internal loss is large and the modulus of elasticity is small and does damping actions by the internal loss factor being large.
For this reason, the damping structural substance provides good vibration absorption and sound absorption action, so that vibrations and sounds, transmitted to the structure to be damped, are absorbed well. Incidentally, in case of a laminated sheet being formed, the internal loss factor &eegr; is shown by the following formula, and as the thickness of the coat is increased, the damping action is also increased.
η
=
e
h
(
3
+
6
h
+
4
h
2
+
2
e
h
3
+
e
2
h
4
)
η
2
(
1
+
e
h
)
{
1
+
2
e
h
(
2
+
3
h
+
2
h
2
)
+
e
2
h
4
}
where: e=E
2
/E
1
, h=H
2
/H
1
&eegr;
2
: an internal loss factor of coat
E
1
: Young's modulus of structure to be damped
E
2
: Young's modulus of coat
H
1
: Sheet thickness of structure to be damped
H
2
: Coating thickness of coat
(2) A damping structural substance of the present invention is characte
Hayashi Shun-ichi
Kannon Tatsumi
Kawai Hidenao
McClendon Sanza L
Mitsubishi Jukogyo Kabushiki Kaisha
Seidleck James J.
Wenderoth , Lind & Ponack, L.L.P.
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