U.S. patent application number 11/964110 was filed with the patent office on 2008-06-26 for scroll fluid machine.
This patent application is currently assigned to ANEST IWATA CORPORATION. Invention is credited to Youhei MIDORIKAWA, Masaru TSUCHIYA.
Application Number | 20080152525 11/964110 |
Document ID | / |
Family ID | 39247220 |
Filed Date | 2008-06-26 |
United States Patent
Application |
20080152525 |
Kind Code |
A1 |
TSUCHIYA; Masaru ; et
al. |
June 26, 2008 |
SCROLL FLUID MACHINE
Abstract
A scroll fluid machine comprises a body having a driving shaft,
an electric motor coupled to the driving shaft, and a blower. The
blower cools the body, a connection between the body and motor, and
the electric motor by wind from the blower.
Inventors: |
TSUCHIYA; Masaru;
(Yokohama-shi, JP) ; MIDORIKAWA; Youhei; (Tokyo,
JP) |
Correspondence
Address: |
ZARLEY LAW FIRM P.L.C.
CAPITAL SQUARE, 400 LOCUST, SUITE 200
DES MOINES
IA
50309-2350
US
|
Assignee: |
ANEST IWATA CORPORATION
Yokohama-shi
JP
|
Family ID: |
39247220 |
Appl. No.: |
11/964110 |
Filed: |
December 26, 2007 |
Current U.S.
Class: |
418/55.1 |
Current CPC
Class: |
F04C 29/04 20130101;
F04C 18/0215 20130101 |
Class at
Publication: |
418/55.1 |
International
Class: |
F04C 29/04 20060101
F04C029/04; F04C 18/02 20060101 F04C018/02; F04C 2/02 20060101
F04C002/02; F04C 15/00 20060101 F04C015/00 |
Foreign Application Data
Date |
Code |
Application Number |
Dec 26, 2006 |
JP |
2006-349521 |
Claims
1. A scroll fluid machine comprising: a body comprising a driving
shaft comprising an eccentric axial portion, an orbiting scroll
having an orbiting wrap rotatably mounted to the eccentric axial
portion, and a fixed scroll having a fixed wrap engaging with the
orbiting wrap to form a sealed chamber between the orbiting wrap
and the fixed wrap; an electric motor operatively connected to the
driving shaft of the body; and a blower at one side of the body to
blow wind toward the body, a connection between the body and the
electric motor, and the electric motor.
2. A scroll fluid machine of claim 1 wherein the blower comprises a
housing; a mounting plate fixed to the housing; a cylindrical hood
mounted to a peripheral edge of an opening of the mounting plate; a
blowing fan in the hood; and a fan-driving electric motor coupled
to the fan; and a plurality of stays fixing the fan-driving
electric motor at a center of the hood.
3. A scroll fluid machine of claim 2 wherein an upper stay of said
plurality of stays acts as streamlined guide which allows part of
wind generated by the fan-driving electric motor to flow toward the
electric motor, thereby enabling wind to flow not only the side of
the body but also to the connection between the electric motor and
the body.
4. A scroll fluid machine of claim 2 wherein the blower is disposed
in parallel with a longitudinal direction of the body and the
electric motor, and comprises a casing and a blowing fan in the
casing, the casing having an outlet facing the body, a connection
between the body and electric motor and the motor to allow wind
therefrom to blow onto and cool them.
5. A scroll fluid machine of claim 2, further comprising a control;
a first temperature sensor attached on the body and connected to
the control; and a second temperature sensor attached on the
electric motor and connected to the control, the control starting
operation of the fan-driving electric motor to move the fan when
temperature detected by one of the sensors is higher than
predetermined temperature
Description
BACKGROUND OF THE INVENTION
[0001] The present invention relates a scroll fluid machine such as
a scroll compressor or a scroll vacuum pump.
[0002] A scroll fluid machine comprises a driving shaft driven by
an electric motor and having an eccentric axial portion; an
orbiting scroll rotatably mounted to the eccentric axial portion
via a bearing and having an orbiting wrap on an orbiting end plate;
a fixed scroll having a fixed wrap on a fixed end plate to form a
sealed chamber between the orbiting wrap and the fixed wrap; and a
self-rotation-preventing device for preventing the orbiting scroll
from rotating on its own axis.
[0003] The orbiting scroll is eccentrically revolved with the
eccentric axial portion of the driving shaft and the
self-rotation-preventing device to gradually reduce volume of the
sealed chamber toward its center of the orbiting scroll to compress
fluid sucked from the outer circumference or to gradually increase
it outward to decompress fluid sucked at the center to discharge it
from the outer circumference.
[0004] With operation of the scroll fluid machine, not only a
driving electric motor but also a bearing of the driving shaft, a
bearing of the eccentric axial portion of the driving shaft, the
self-rotation-preventing devices and a portion contacting an
opposite surface of a tip seal in a groove of the end of the
orbiting wrap are heated to decrease its performance and to shorten
its life. Thus, it is necessary to cool the parts effectively not
to raise temperature to more than fixed temperature.
[0005] As a method for cooling a scroll fluid machine with air,
JP2001-123969A discloses that a fan is mounted to an output shaft
of an electric motor coupled to a fluid machine body, the fan being
turned with the electric motor to blow air toward the motor and the
body, and JP8-21392A discloses that three fans driven by auxiliary
electric motors are disposed at front and both sides of the
fluid-machine body to blow toward the body.
[0006] The former enables the electric motor to be cooled by a
blower at some extent, but air heated by the electric motor is
blown toward the fluid machine body thereby making it impossible
for the body to be cooled efficiently.
[0007] The latter generates cooling wind by the auxiliary electric
motors to enable each part to be blown suitably, but in addition to
the electric motor for the body itself, the three auxiliary
electric motors, fans and mounting structures therefor are
required, which is uneconomical and increases it whole size. Also,
cooling winds are mixed to each other to decrease desired cooling
efficiency.
SUMMARY OF THE INVENTION
[0008] It is an object of the invention to provide a scroll fluid
machine in which a fluid-machine body, an electric motor and a
connection between the body and motor are efficiently cooled,
structure of the machine being simple, its whole size being the
minimum.
BRIEF DESCRIPTION OF THE DRAWINGS
[0009] 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:
[0010] FIG. 1 is a side elevational view of the first embodiment of
a scroll fluid machine according to the present invention;
[0011] FIG. 2 is a top plan view thereof;
[0012] FIG. 3 is a front elevational view thereof;
[0013] FIG. 4 is a vertical sectional view taken along the line
IV-IV in FIG. 3;
[0014] FIG. 5A is an exploded perspective view of a cooling
fan;
[0015] FIG. 5B is a perspective view of the assembled fan;
[0016] FIG. 6 is a top plan view of the second embodiment of a
scroll fluid machine; and
[0017] FIG. 7 is a view of the third embodiment of a scroll fluid
machine and a control system thereof according to the present
invention.
DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS
[0018] FIGS. 1 to 5 show the first embodiment of the present
invention. In the following description, in FIGS. 1 and 2, the left
side is deemed "the front", while the right side is deemed "the
rear".
[0019] A scroll fluid machine comprises a body 1; an electric motor
2 joined to the rear (the right of FIGS. 1 and 2) of the body 1;
and a blower 3 disposed to one side of the body 1.
[0020] In FIG. 4, the body 1 comprises a fixed scroll 5 having an
inlet 5a at the upper front part, an outlet 5b at the center and a
fixed wrap 4 at the rear surface; a housing 6 around the fixed
scroll 5; a driving shaft 7 rotatably mounted in s boss 6a in the
middle of the rear side via a bearing 6b; an orbiting scroll 8
rotatably mounted around an eccentric axial portion 7a at the front
end of the driving shaft 7 to allow an orbiting wrap 9 thereof to
engage with the fixed wrap 4 to form a sealed chamber; and three
crank pins 10 each of which constitutes a self-rotation-preventing
device the front end of which is rotatably mounted to the orbiting
scroll 8. Only one of the crank pins 10 is shown in FIG. 4.
[0021] The driving shaft 7 is turned by the electric motor 2 to
allow the orbiting scroll to revolve thereby forming the sealed
chamber between the fixed wrap 4 and the orbiting wrap 9, so that
air taken in through the inlet 5a is compressed and discharged from
the outlet 5b.
[0022] A number of cooling fins 11, 12 are provided on the front
surface of the fixed scroll 5 and the rear surface of the orbiting
scroll 8 to diffuse heat involved with compression.
[0023] A number of cooling fins 13a are provided on the outer
circumferential surface of a housing 13 for the electric motor 2. A
front end plate 13b of the housing 13 is bolted to the rear of the
housing 6 for the body 1.
[0024] The front end of a rotationally-driving output shaft 14
projecting forward from the center of the end plate 13b is joined
to the rear end of the driving shaft 7 via a shaft coupling 15 to
allow the power to be transfered from the electric motor 2 to the
driving shaft 7.
[0025] In FIGS. 1-3 and FIG. 5, the blower 3 comprises a box-like
thin support 16 fixed to one side of the housing 6 with a plurality
of screws (not shown) and extending a connection between the body 1
and the electric motor 2 or boss 6a covering the shaft joint 15; a
short-depth cylindrical hood 19 coupled to the circumference of a
circular opening 17 in the middle of the support 16 and having a
plurality of grilles 18; a blowing fan 21 in the hood 19 to turn
around an axis perpendicular to the side of the body 1; a
fan-driving flat electric motor 21 an output shaft of which is
coupled to the rear surface of the blowing fan 20; and a plurality
of support stays 22 fixing the fan-driving electric motor 21 at the
center in the hood 19.
[0026] An upper stay 22a of the support stays 22 acts as
streamlined guide which allows part of wind generated by the
fan-driving electric motor 20 to flow toward the electric motor 2,
thereby enabling wind to flow not only to the side of the body 1
but also to the shaft coupling 15 between the electric motor 2 and
the body 1 at the optimum separation rate at the same time. Thus, a
single blower 3 can cool the body 1, the connection between the
body 1 and the motor 2 and the motor 2 effectively. Also the blower
3 is disposed at the side of the body 1 thereby facilitating the
structure and minumizing the whole size.
[0027] The number of the guide 22a is not limited to one, but may
be increased depending on the optimum separation rate of blowing
amount to the body 1 and the electric motor 2 or may be
omitted.
[0028] FIG. 6 shows the second embodiment of the present invention,
in which the same numerals are allotted to the same members and
description thereof is omitted.
[0029] In the second embodiment, a fluid machine body 1 is disposed
close to and substantially in parallel with an electric motor 2 and
a cylindrical blower 30.
[0030] The blower 30 comprises a casing 31 which has an outlet 31a
facing the body 1, a connection between the body 1 and the electric
motor 2 and the electric motor 2; a blowing fan 33 such as
cross-flow fan or a sirocco fan rotatable around a shaft 31 almost
in parallel with the body 1; and a fan-driving electric motor
34.
[0031] It enables wind to blow toward the body 1, the connection
between the body 1 and the electric motor 2 and the motor 2 and
enables them to be cooled efficiently.
[0032] FIG. 7 shows the third embodiment of the present invention,
in which the same numerals are allotted to the same members as
those in the first embodiment and description thereof is
omitted.
[0033] In the third embodiment, temperature sensors 23, 24 are
attached on a fluid machine body 1 and an electric motor 3
respectively. The temperature sensors 23, 24 are input to a control
26 via leads 23a, 24a and an A/D converter 25.
[0034] Predetermined temperature data are stored in the control 26
and compared by the control 26 with detected data in the
temperature sensor 23, 24. When the detected data is less than the
predetermined temperature, it turn off a fan-driving electric motor
21 or 33. When it is more than the predetermined temperature, it
turns on the fan-driving electric motor 21 or 33.
[0035] In the foregoing embodiments, the blowing fans 20, 33 and
fan-driving electric motors 21, 34 are disposed in the vicinity of
one side of the fluid-machine body 1, but the present invention is
not limited thereto. Instead, in the vicinity of the fluid-machine
body 1, there may be provided an outlet for blowing out wind
produced by rotation of blowing fans toward the fluid-machine body
1, a connection between the body 1 and the electric motor 2 and
motor 2.
[0036] A plurality of flow-shifting plates are provided to shift
cooling wind to part requiring to be cooled thereby enabling wind
produced by the blowing fans 13a, 20 to be transferred to the
fluid-machine body 1, electric motor 2 and the connection between
the body 1 and the motor 2 at distribution rate corresponding to
required heat-releasing amount. The distribution ratio
corresponding to required heat-releasing amount means to increase
blowing amount to part where a lot of heat is released to decrease
blowing amount to part where heat is not so released. The
flow-shifting plate is manually changed to direct in a
predetermined direction, or changed with power such as a motor
toward part where a lot of heat is released based on temperature
detected by the temperature sensors 23, 24.
[0037] The foregoing merely relates to embodiments of the present
invention. Various changes and modifications may be made by those
skilled in the art without departing from the scope of claims
wherein:
* * * * *