U.S. patent application number 11/162300 was filed with the patent office on 2006-03-16 for acoustic fluid machine.
This patent application is currently assigned to ANEST IWATA CORPORATION. Invention is credited to Tamotsu FUJIOKA, Mohammed Anwar HOSSAIN, Masaaki KAWAHASHI, Masayuki SAITO.
Application Number | 20060054382 11/162300 |
Document ID | / |
Family ID | 36032666 |
Filed Date | 2006-03-16 |
United States Patent
Application |
20060054382 |
Kind Code |
A1 |
KAWAHASHI; Masaaki ; et
al. |
March 16, 2006 |
ACOUSTIC FLUID MACHINE
Abstract
In an acoustic resonator, an actuator allows a piston to
reciprocate axially at very small amplitude at high speed. Owing to
pressure fluctuation in the acoustic resonator involved by
reciprocal motion of the piston, fluid is sucked into and
discharged from the acoustic resonator via a valve device at the
top end of the acoustic resonator. The acoustic resonator is
covered with a gas guide with a space. The valve device is cooled
by a fan at the top end of the gas guide.
Inventors: |
KAWAHASHI; Masaaki;
(Saitama-shi, JP) ; FUJIOKA; Tamotsu;
(Yokohama-shi, JP) ; HOSSAIN; Mohammed Anwar;
(Yokohama-shi, JP) ; SAITO; Masayuki; (Cincinnati,
OH) |
Correspondence
Address: |
ZARLEY LAW FIRM P.L.C.
CAPITAL SQUARE
400 LOCUST, SUITE 200
DES MOINES
IA
50309-2350
US
|
Assignee: |
ANEST IWATA CORPORATION
3176, Shinyoshida-cho Kohoku-ku, Yokohama-shi, Kanagawa
Yokohama-shi
JP
|
Family ID: |
36032666 |
Appl. No.: |
11/162300 |
Filed: |
September 6, 2005 |
Current U.S.
Class: |
181/262 |
Current CPC
Class: |
F04F 7/00 20130101; G10K
11/22 20130101; G10K 11/02 20130101 |
Class at
Publication: |
181/262 |
International
Class: |
F01N 1/14 20060101
F01N001/14 |
Foreign Application Data
Date |
Code |
Application Number |
Sep 10, 2004 |
JP |
2004-263654 |
Claims
1. An acoustic fluid machine comprising: an acoustic resonator; an
actuator in a larger-diameter base end of the acoustic resonator to
allow a piston to reciprocate at very small amplitude axially at
high speed; a valve device at a top end of the acoustic resonator
to suck fluid and discharge it from the acoustic resonator
according to pressure fluctuation in the acoustic resonator
involved by reciprocating motion of the piston; a gas guide that
covers the acoustic resonator with a space and opens at a base end;
and a fan at a top end of the gas guide to forward fluid to cool
the valve device to reduce temperature gradient between a base and
a top end of the acoustic resonator.
2. An acoustic fluid machine of claim 1 wherein the fan is
electrically driven.
3. An acoustic fluid machine of claim 2, further comprising a
temperature sensor on the acoustic resonator for detecting
temperature of the acoustic resonator to control electricity supply
to the fan.
4. An acoustic fluid machine of claim 3, further comprising a
control unit connected to the temperature sensor and the fan to
control the electricity supply to the fan on the basis of
temperature detected by the temperature sensor.
5. An acoustic fluid machine of claim 1 wherein the fan is driven
by a compressed-air actuating turbine.
6. An acoustic fluid machine of claim 5 wherein the fluid
discharged from the acoustic resonator via the valve device is
forwarded to the compressed-air-actuating turbine to allow the fan
to be driven.
7. An acoustic fluid machine of claim 6, further comprising a
regulating valve for regulating fluid from the acoustic resonator,
degree of opening of the regulating valve being controlled by a
temperature sensor on the acoustic resonator.
8. An acoustic fluid machine of claim 6 wherein fluid discharged
from the compressed-air-actuating turbine is forwarded into the
acoustic resonator for cooling.
9. An acoustic fluid machine of claim 8 wherein the fluid forwarded
into the acoustic compressor is cooled by a cooling fin of the
compressed-air-actuating turbine.
Description
BACKGROUND OF THE INVENTION
[0001] The present invention relates to an acoustic fluid machine
to keep temperature gradient as small as possible between the base
having an actuator for an acoustic resonator and the top end having
a valve device for sucking and discharge.
[0002] Japanese Patent Pub. No. 2004-116309A corresponding to U.S.
patent application Ser. No. 10/922,383 filed Aug. 19, 2004
discloses an acoustic fluid machine in which an actuator that has a
piston is provided at the base of a tapered acoustic resonator for
creating in-tube wave motion with acoustic resonation, and a valve
device for sucking and discharging fluid with pressure fluctuation
therein.
[0003] In the acoustic fluid machine, only when fluid temperature
is within a certain range, the shape and size of the acoustic
resonator enables the optimum resonation frequency to be produced,
thereby carrying out the optimum sucking and discharge of the
fluid. Should resonation frequency be out of the predetermined
range, compression ratio becomes smaller, making it impossible to
obtain a desired discharge pressure.
[0004] The resonation frequency varies with change in temperature
of the resonator. Thus, calculation of the resonation frequency
allows frequency of the actuator of the piston to vary to match the
calculated resonation frequency thereby exhibiting a desired
sucking/discharge.
[0005] Accordingly, it is necessary to use arithmetic equipment to
control the actuator of the piston, which makes its structure
complicate and involves high cost.
[0006] Temperature in the acoustic resonator of the acoustic fluid
machine is high at the generally-closed top end or a valve device,
while it is low at the generally-opening piston and actuator
therefor to increase temperature gradient. If temperature gradient
in the acoustic resonator is as small as possible, the determined
resonation frequency will be within a normal compression area
without deviation or with slight deviation.
SUMMARY OF THE INVENTION
[0007] In view of the foregoing disadvantages, it is an object of
the present invention to provide an acoustic fluid machine in which
temperature gradient between the base and the top end of an
acoustic resonator is kept as small as possible.
BRIEF DESCRIPTION OF THE DRAWINGS
[0008] The features and advantages of the invention will become
more apparent from the following description with respect to
embodiments as shown in accompanying drawings wherein:
[0009] FIG. 1 is a vertical sectional front view of an embodiment
of an acoustic fluid machine according to the present
invention;
[0010] FIG. 2 is a vertical sectional front view of another
embodiment of an acoustic fluid machine according to the present
invention;
[0011] FIG. 3 is a vertical sectional front view of still another
embodiment of an acoustic fluid machine according to the present
invention;
[0012] FIG. 4 is a vertical sectional front view of yet another
embodiment of an acoustic fluid machine according to the present
invention;
[0013] FIG. 5 is a vertical sectional front view of a further
embodiment of an acoustic fluid machine according to the present
invention;
[0014] FIG. 6 is a vertical sectional front view of a still further
embodiment of an acoustic fluid machine according to the present
invention; and
[0015] FIG. 7 is a vertical sectional front view of a yet further
embodiment of an acoustic fluid machine according to the present
invention.
DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS
[0016] Numeral 1 denotes an acoustic fluid machine in which an
acoustic resonator 2 has an actuator 3 in a larger-diameter base. A
piston (not shown) is reciprocated axially at high speed at very
small amplitude. Owing to pressure fluctuation in the acoustic
resonator 2 involved by reciprocal motion of the piston, air and
other fluid are sucked into the acoustic resonator 2 through a
sucking pipe 5 and discharged from a discharge pipe 6.
[0017] The acoustic fluid machine 1 is contained with a space in a
gas guide 7 that opens at the top end and the base end. A fan 8 is
provided inside the top end of the gas guide 7.
[0018] FIG. 1 shows that the fan 8 is driven by an electric motor
10 mounted to the outer surface of the top end of the gas guide 7
by a bracket 9.
[0019] FIG. 2 shows that a control unit 1 2 allows electricity
supplied into the electric motor 10 in FIG. 1 to vary depending on
detected temperature of a temperature sensor 11 in the acoustic
resonator 2. Thus, the quantity of air supplied by a fan is allowed
to vary depending on temperature of the acoustic resonator 2.
[0020] FIG. 3 shows that the fan 8 is driven by a
compressed-air-actuating turbine 14 via an air tube 13.
[0021] FIG. 4 shows that the compressed-air-actuating turbine 14 is
driven by pressurized air sucked from the sucking pipe 5 and
discharged from the discharge pipe 6 via a valve device 4. The
pressurized air from the compressed-air-actuating turbine 14 is
thus employed for primary purpose.
[0022] In FIG. 5, the pressurized air discharged from the valve
device 4 is forwarded to the compressed-air-actuating turbine 14
via a regulating valve 15, and the control unit 17 allows the
degree of opening of the regulating valve 15 to be controlled on
the basis of the temperature sensor 16 on the acoustic resonator
2.
[0023] In FIGS. 6 and 7, a discharge pipe 1 8 of the
compressed-air-actuating turbine 14 is allowed to open into the end
of the acoustic resonator 2 to enable the valve device 4 to be
cooled more properly. As shown in FIGS. 6 and 7, discharged air
into the acoustic resonator 2 may be preferably cooled by a cooling
fin 19 of the discharge pipe 18 or other means.
[0024] In any of FIGS. 1 to 7, air sucked through the top end of
the gas guide 7 is allowed to blow toward the valve device 4 and
discharged from the rear end of the gas guide 7.
[0025] As shown in FIG. 6, a heat-radiating fin 20 may be provided
to equalize radiated heat and promote radiation on the outer
circumferential surface of the acoustic resonator 2.
[0026] The foregoing merely relates to embodiments of the present
invention. Various changes and modifications may be made by a
person skilled in the art without departing from the scope of
claims.
* * * * *