U.S. patent application number 13/414253 was filed with the patent office on 2013-09-12 for compressor unit including gear rotor and compressor system using the same.
The applicant listed for this patent is Gobee KIM, Wookyun KIM, Yubee KIM. Invention is credited to Gobee KIM, Wookyun KIM, Yubee KIM.
Application Number | 20130236345 13/414253 |
Document ID | / |
Family ID | 49114287 |
Filed Date | 2013-09-12 |
United States Patent
Application |
20130236345 |
Kind Code |
A1 |
KIM; Gobee ; et al. |
September 12, 2013 |
COMPRESSOR UNIT INCLUDING GEAR ROTOR AND COMPRESSOR SYSTEM USING
THE SAME
Abstract
A compressor unit having a gear rotor, and a compressor system
using the same are provided. The compressor system includes a
compressor unit having a triple trochoidal rotor, which includes a
first rotor, a second rotor, a third rotor, a casing, second and
first suction ports, and second and first discharge ports; and a
driving unit that rotates the three rotors such that external
working fluid is sucked into the suction port and the working fluid
sucked into the suction port is discharged to the discharge port in
a state of being compressed. The compressor unit may be constructed
as a triple trochoidal rotor such that working fluid can be
compressed in a two-stage compression manner to enable the working
fluid to be supplied at high pressure and provide a high-speed,
high-pressure compression capability.
Inventors: |
KIM; Gobee; (Carrollton,
TX) ; KIM; Wookyun; (Gyeongsan-si, KR) ; KIM;
Yubee; (Gyeongsan-si, KR) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
KIM; Gobee
KIM; Wookyun
KIM; Yubee |
Carrollton
Gyeongsan-si
Gyeongsan-si |
TX |
US
KR
KR |
|
|
Family ID: |
49114287 |
Appl. No.: |
13/414253 |
Filed: |
March 7, 2012 |
Current U.S.
Class: |
418/61.2 |
Current CPC
Class: |
F04C 29/12 20130101;
F04C 23/001 20130101; F04C 18/10 20130101; F04C 28/02 20130101;
F04C 2240/30 20130101 |
Class at
Publication: |
418/61.2 |
International
Class: |
F01C 1/02 20060101
F01C001/02 |
Claims
1. A compressor unit comprising: a first rotor having a plurality
of outwardly extending trochoidal gear teeth formed on the outer
peripheral surface thereof and a stationary shaft securely fixed to
a rotary center thereof; a second rotor configured to eccentrically
accommodate the first rotor therein, the second rotor having a
plurality of inwardly extending trochoidal gear teeth formed on the
inner peripheral surface thereof in such a manner that the inwardly
extending trochoidal gear teeth of the second rotor are in line
contact with the outwardly extending trochoidal gear teeth of the
first rotor while being engaged with the trochoidal gear teeth of
the first rotor, and a plurality of outwardly extending trochoidal
gear teeth formed on the outer peripheral surface thereof, wherein
the number of the inwardly extending trochoidal gear teeth of the
second rotor is larger than that of the outwardly extending
trochoidal gear teeth of the first rotor and the number of the
outwardly extending trochoidal gear teeth of the second rotor is
equal to that of the inwardly extending trochoidal gear teeth of
the second rotor; a third rotor configured to eccentrically
accommodate the second rotor therein, and having a plurality of
inwardly extending trochoidal gear teeth formed on the inner
peripheral surface thereof in such a manner that the inwardly
extending trochoidal gear teeth of the third rotor are in line
contact with the outwardly extending trochoidal gear teeth of the
second rotor while being engaged with the outwardly extending
trochoidal gear teeth of the second rotor, where the number of the
inwardly extending trochoidal gear teeth of the third rotor is
larger than that of the outwardly extending trochoidal gear teeth
of the second rotor; a casing configured to sealingly accommodate
the first, second and third rotors in such a manner as to be
disposed independently of the stationary shaft of the first rotor,
and rotatably support the driving shaft of the third rotor in a
state in which the driving shaft extends protrudingly to the
outside; a second suction port disposed at a side of the driving
shaft so as to fluidically connect the inside and the outside of
the casing, and position at a portion in which the space between
the outwardly extending trochoidal gear teeth of the first rotor
and the inwardly extending trochoidal gear teeth of the second
rotor are widened maximally when the first, second and third rotors
are rotated, and a first suction port positioned at a portion in
which the space between the outwardly extending trochoidal gear
teeth of the second rotor and the inwardly extending trochoidal
gear teeth of the third rotor is widened maximally; and a second
discharge port positioned at a portion in which the space between
the outwardly extending trochoidal gear teeth of the first rotor
and the inwardly extending trochoidal gear teeth of the second
rotor are narrowed when the first, second and third rotors are
rotated, and a first discharge port positioned at a portion in
which the space between the outwardly extending trochoidal gear
teeth of the second rotor and the inwardly extending trochoidal
gear teeth of the third rotor is narrowed.
2. The compressor unit according to claim 1, further comprising: a
suction resistance preventing slot formed in a compressor cover
that fixes a central rotary shaft of the first rotor to an external
cover upon the rotation of the first, second and the third rotors,
in such a manner as to extend from the first and second suction
ports; a residue compressed gas rotation resistance preventing slot
formed in the compressor cover in such a manner as to extend from
the first and second discharge ports; and a compression ratio
adjustment slot formed in the compressor cover in such a manner as
to extend from the first and second discharge ports.
3. The compressor system according to claim 1, wherein the
compressor unit further comprises: a suction resistance preventing
slot formed in a compressor cover that fixes a central rotary shaft
of the first rotor to an external cover upon the rotation of the
first, second and the third rotors, in such a manner as to extend
from the first and second suction ports; a residue compressed gas
rotation resistance preventing slot formed in the compressor cover
in such a manner as to extend from the first and second discharge
ports; and a compression ratio adjustment slot formed in the
compressor cover in such a manner as to extend from the first and
second discharge ports.
4. The compressor system according to claim 1, wherein the
compressor unit including a triple trochoidal rotor is applied to
industrial compressors, two-stage expanders, two-stage fluid pumps,
vacuum pumps, companders (combined compressors and expanders), and
expander pumps (external expanders and internal pumps).
5. A compressor system comprising: a compressor unit including a
triple trochoidal rotor, the compressor unit comprising: a first
rotor having a plurality of outwardly extending trochoidal gear
teeth formed on the outer peripheral surface thereof and a
stationary shaft securely fixed to a rotary center thereof; a
second rotor configured to eccentrically accommodate the first
rotor therein, the second rotor having a plurality of inwardly
extending trochoidal gear teeth formed on the inner peripheral
surface thereof in such a manner that the inwardly extending
trochoidal gear teeth of the second rotor are in line contact with
the outwardly extending trochoidal gear teeth of the first rotor
while being engaged with the trochoidal gear teeth of the first
rotor, and a plurality of outwardly extending trochoidal gear teeth
formed on the outer peripheral surface thereof, wherein the number
of the inwardly extending trochoidal gear teeth of the second rotor
is larger than that of the outwardly extending trochoidal gear
teeth of the first rotor and the number of the outwardly extending
trochoidal gear teeth of the second rotor is equal to that of the
inwardly extending trochoidal gear teeth of the second rotor; a
third rotor configured to eccentrically accommodate the second
rotor therein, and having a plurality of inwardly extending
trochoidal gear teeth formed on the inner peripheral surface
thereof in such a manner that the inwardly extending trochoidal
gear teeth of the third rotor are in line contact with the
outwardly extending trochoidal gear teeth of the second rotor while
being engaged with the outwardly extending trochoidal gear teeth of
the second rotor, where the number of the inwardly extending
trochoidal gear teeth of the third rotor is larger than that of the
outwardly extending trochoidal gear teeth of the second rotor; a
casing configured to sealingly accommodate the first, second and
third rotors in such a manner as to be disposed independently of
the stationary shaft of the first rotor, and rotatably support the
driving shaft of the third rotor in a state in which the driving
shaft extends protrudingly to the outside; a second suction port
disposed at a side of the driving shaft so as to fluidically
connect the inside and the outside of the casing, and position at a
portion in which the space between the outwardly extending
trochoidal gear teeth of the first rotor and the inwardly extending
trochoidal gear teeth of the second rotor are widened maximally
when the first, second and third rotors are rotated, and a first
suction port positioned at a portion in which the space between the
outwardly extending trochoidal gear teeth of the second rotor and
the inwardly extending trochoidal gear teeth of the third rotor is
widened maximally; and a second discharge port positioned at a
portion in which the space between the outwardly extending
trochoidal gear teeth of the first rotor and the inwardly extending
trochoidal gear teeth of the second rotor are narrowed when the
first, second and third rotors are rotated, and a first discharge
port positioned at a portion in which the space between the
outwardly extending trochoidal gear teeth of the second rotor and
the inwardly extending trochoidal gear teeth of the third rotor is
narrowed; and a driving unit connected to the driving shaft, and
configured to apply a torque to the driving shaft to rotate the
first, second and third rotors such that external working fluid is
sucked into the suction port and the working fluid sucked into the
suction port is discharged to the discharge port in a state of
being compressed.
6. The compressor system according to claim 5, wherein first
discharge port and the second suction port are fluidically
connected to the connection pipe or the inside of the compressor
front cover such that the working fluid primarily compressed
between the second rotor and the third rotor after being sucked
into the first suction port and then primarily discharged through
the first discharge port is induced to the second suction port to
cause the working fluid to be secondarily compressed between the
first rotor and the second rotor, and the primarily discharged
fluid is cooled and then is sucked into the second suction port to
lower the temperature of the fluid discharged to the second
discharge port.
7. The compressor system according to claim 5, wherein the
compressor unit including a triple trochoidal rotor is applied to
industrial compressors, two-stage expanders, two-stage fluid pumps,
vacuum pumps, companders (combined compressors and expanders), and
expander pumps (external expanders and internal pumps).
Description
BACKGROUND OF THE INVENTION
[0001] 1. Field of the Invention
[0002] The present invention relates to a compressor unit including
a gear rotor, which is constructed as a triple trochoidal rotor
such that working fluid can be compressed in a two-stage
compression manner to enable the working fluid to be supplied at
high pressure, and the volume of working fluid sucked and
discharged can be increased to provide a high-speed, high-pressure
compression capability, and a compressor system using the same.
[0003] 2. Description of the Related Art
[0004] A compressor unit having a trochoidal rotor includes two
gear rotors that are rotated in a state of being engaged with each
other to cause working fluid to pass through therebetween to
compress the working fluid, and a casing that accommodates the gear
rotors therein. The trochoidal rotor is a rotor or gear rotor
having trochoidal gear teeth formed on the inner and outer
peripheral surfaces thereof.
[0005] The above conventional compressor unit includes: a first
rotor having a plurality of outwardly extending trochoidal gear
teeth formed on the outer peripheral surface thereof; a second
rotor that accommodates the first rotor at an eccentric position
relative to rotary center axis thereof therein and has a plurality
of inwardly extending trochoidal gear teeth formed on the inner
peripheral surface thereof in such a manner that the inwardly
extending trochoidal gear teeth of the second rotor are in line
contact with the outwardly extending trochoidal gear teeth of the
first rotor while being engaged with the trochoidal gear teeth of
the first rotor; and a casing that sealing accommodates the first
and second rotors therein.
[0006] The conventional compressor unit as constructed above has a
basic operation mechanism in which fluid is sucked and compressed,
and is discharged depending on a change in the volume between the
first rotor and the second rotor. This compressor unit is
relatively simple in structure and can be made small-scale, and
thus has been used as a fluid pump over the past few decades.
[0007] However, such a conventional compressor unit has a
limitation in that it employs only two rotors. That is, although a
torque of the first rotor is increased, the working fluid is
discharged each time when the first rotor is rotated by one turn,
and thus the pressure of the discharged working fluid is not high
above a given level. Therefore, the use of the compressor unit is
limited at a place where more than a given head is required. In
addition, a discharge speed of the fluid is limited, and thus
high-speed pumping capability is not provided.
[0008] Therefore, there is an urgent need for a compressor unit
including a gear rotor, which is constructed as a triple trochoidal
rotor such that the working fluid can be compressed in a two-stage
compression manner to enable the working fluid to be supplied at
high pressure, and the volume of working fluid sucked and
discharged can be increased to provide a high-speed, high-pressure
compression capability, and a compressor system using the same.
SUMMARY OF THE INVENTION
[0009] Accordingly, the present invention has been made in order to
solve the above-mentioned problems occurring in the prior art, and
it is an object of the present invention to provide a compressor
unit including a gear rotor, which is constructed as a triple
trochoidal rotor such that the working fluid can be compressed in a
two-stage compression manner to enable the working fluid to be
supplied at high pressure, and a compressor system using the
same.
[0010] Another object of the present invention is to provide a
compressor unit including a gear rotor, which is constructed as a
triple trochoidal rotor such that the volume of working fluid
sucked and discharged can be increased to provide a high-speed,
high-pressure compression capability, and a compressor system using
the same.
[0011] To achieve the above objects, in accordance with an aspect
of the present invention, a compressor unit is provided. The
compressor unit includes a first rotor having a plurality of
outwardly extending trochoidal gear teeth formed on the outer
peripheral surface thereof and a stationary shaft securely fixed to
a rotary center thereof; a second rotor configured to eccentrically
accommodate the first rotor therein, the second rotor having a
plurality of inwardly extending trochoidal gear teeth formed on the
inner peripheral surface thereof in such a manner that the inwardly
extending trochoidal gear teeth of the second rotor are in line
contact with the outwardly extending trochoidal gear teeth of the
first rotor while being engaged with the trochoidal gear teeth of
the first rotor, and a plurality of outwardly extending trochoidal
gear teeth formed on the outer peripheral surface thereof, wherein
the number of the inwardly extending trochoidal gear teeth of the
second rotor is larger than that of the outwardly extending
trochoidal gear teeth of the first rotor and the number of the
outwardly extending trochoidal gear teeth of the second rotor is
equal to that of the inwardly extending trochoidal gear teeth of
the second rotor; a third rotor configured to eccentrically
accommodate the second rotor therein, and having a plurality of
inwardly extending trochoidal gear teeth formed on the inner
peripheral surface thereof in such a manner that the inwardly
extending trochoidal gear teeth of the third rotor are in line
contact with the outwardly extending trochoidal gear teeth of the
second rotor while being engaged with the outwardly extending
trochoidal gear teeth of the second rotor, where the number of the
inwardly extending trochoidal gear teeth of the third rotor is
larger than that of the outwardly extending trochoidal gear teeth
of the second rotor; a casing configured to sealingly accommodate
the first, second and third rotors in such a manner as to be
disposed independently of the stationary shaft of the first rotor,
and rotatably support the driving shaft of the third rotor in a
state in which the driving shaft extends protrudingly to the
outside; a second suction port disposed at a side of the driving
shaft so as to fluidically connect the inside and the outside of
the casing, and position at a portion in which the space between
the outwardly extending trochoidal gear teeth of the first rotor
and the inwardly extending trochoidal gear teeth of the second
rotor are widened maximally when the first, second and third rotors
are rotated, and a first suction port positioned at a portion in
which the space between the outwardly extending trochoidal gear
teeth of the second rotor and the inwardly extending trochoidal
gear teeth of the third rotor is widened maximally; and a second
discharge port positioned at a portion in which the space between
the outwardly extending trochoidal gear teeth of the first rotor
and the inwardly extending trochoidal gear teeth of the second
rotor are narrowed when the first, second and third rotors are
rotated, and a first discharge port positioned at a portion in
which the space between the outwardly extending trochoidal gear
teeth of the second rotor and the inwardly extending trochoidal
gear teeth of the third rotor is narrowed.
[0012] In addition, to achieve the above objects, in accordance
with another aspect of the present invention, a compressor system
is provided. The compressor system includes a compressor unit
including a triple trochoidal rotor, the compressor unit including
a first rotor having a plurality of outwardly extending trochoidal
gear teeth formed on the outer peripheral surface thereof and a
stationary shaft securely fixed to a rotary center thereof; a
second rotor configured to eccentrically accommodate the first
rotor therein, the second rotor having a plurality of inwardly
extending trochoidal gear teeth formed on the inner peripheral
surface thereof in such a manner that the inwardly extending
trochoidal gear teeth of the second rotor are in line contact with
the outwardly extending trochoidal gear teeth of the first rotor
while being engaged with the trochoidal gear teeth of the first
rotor, and a plurality of outwardly extending trochoidal gear teeth
formed on the outer peripheral surface thereof, wherein the number
of the inwardly extending trochoidal gear teeth of the second rotor
is larger than that of the outwardly extending trochoidal gear
teeth of the first rotor and the number of the outwardly extending
trochoidal gear teeth of the second rotor is equal to that of the
inwardly extending trochoidal gear teeth of the second rotor; a
third rotor configured to eccentrically accommodate the second
rotor therein, and having a plurality of inwardly extending
trochoidal gear teeth formed on the inner peripheral surface
thereof in such a manner that the inwardly extending trochoidal
gear teeth of the third rotor are in line contact with the
outwardly extending trochoidal gear teeth of the second rotor while
being engaged with the outwardly extending trochoidal gear teeth of
the second rotor, where the number of the inwardly extending
trochoidal gear teeth of the third rotor is larger than that of the
outwardly extending trochoidal gear teeth of the second rotor; a
casing configured to sealingly accommodate the first, second and
third rotors in such a manner as to be disposed independently of
the stationary shaft of the first rotor, and rotatably support the
driving shaft of the third rotor in a state in which the driving
shaft extends protrudingly to the outside; a second suction port
disposed at a side of the driving shaft so as to fluidically
connect the inside and the outside of the casing, and position at a
portion in which the space between the outwardly extending
trochoidal gear teeth of the first rotor and the inwardly extending
trochoidal gear teeth of the second rotor are widened maximally
when the first, second and third rotors are rotated, and a first
suction port positioned at a portion in which the space between the
outwardly extending trochoidal gear teeth of the second rotor and
the inwardly extending trochoidal gear teeth of the third rotor is
widened maximally; and a second discharge port positioned at a
portion in which the space between the outwardly extending
trochoidal gear teeth of the first rotor and the inwardly extending
trochoidal gear teeth of the second rotor are narrowed when the
first, second and third rotors are rotated, and a first discharge
port positioned at a portion in which the space between the
outwardly extending trochoidal gear teeth of the second rotor and
the inwardly extending trochoidal gear teeth of the third rotor is
narrowed; and a driving unit connected to the driving shaft, and
configured to apply a torque to the driving shaft to rotate the
first, second and third rotors such that external working fluid is
sucked into the suction port and the working fluid sucked into the
suction port is discharged to the discharge port in a state of
being compressed.
[0013] According to an aspect of the present invention, the first
discharge port and the second suction port may be fluidically
connected to the connection pipe or the inside of the compressor
front cover such that the working fluid primarily compressed
between the second rotor and the third rotor after being sucked
into the first suction port and then primarily discharged through
the first discharge port is induced to the second suction port to
cause the working fluid to be secondarily compressed between the
first rotor and the second rotor, and the primarily discharged
fluid is cooled and then is sucked into the second suction port to
lower the temperature of the fluid discharged to the second
discharge port.
[0014] According to an aspect of the present invention, the
compressor unit may further include a suction resistance preventing
slot formed in a compressor cover that fixes a central rotary shaft
of the first rotor to an external cover upon the rotation of the
first, second and the third rotors, in such a manner as to extend
from the first and second suction ports; a residue compressed gas
rotation resistance preventing slot formed in the compressor cover
in such a manner as to extend from the first and second discharge
ports; and a compression ratio adjustment slot formed in the
compressor cover in such a manner as to extend from the first and
second discharge ports.
[0015] According to an aspect of the present invention, the
compressor unit including a triple trochoidal rotor may be applied
to industrial compressors, two-stage expanders, two-stage fluid
pumps, vacuum pumps, companders (combined compressors and
expanders), and expander pumps (external expanders and internal
pumps).
BRIEF DESCRIPTION OF THE DRAWINGS
[0016] The above and other objects, features and advantages of the
present invention will be apparent from the following detailed
description of embodiments of the invention in conjunction with the
accompanying drawings, in which:
[0017] FIG. 1 is a view illustrating a compressor unit including a
gear rotor in accordance with an embodiment of the present
invention;
[0018] FIG. 2 is a view illustrating the construction of a front
cover of the construction of a front cover of the compressor unit
shown in FIG. 1;
[0019] FIG. 3 is a view illustrating the construction of a rotor of
the compressor shown in FIG. 1;
[0020] FIG. 4 is a view illustrating a side of the compressor shown
in FIG. 1;
[0021] FIG. 5 is a block diagram illustrating the construction of a
compressor system including a gear rotor accordance with an
embodiment of the present invention;
[0022] FIG. 6 shows a compression mechanism of the compressor
system shown in FIG. 5; and
[0023] FIG. 7 shows another embodiment of a compression mechanism
of the compressor system shown in FIG. 5.
DETAILED DESCRIPTION OF EMBODIMENTS OF THE INVENTION
[0024] Reference will be now made in detail to embodiments of the
present invention with reference to the attached drawings. In the
following description, the detailed description on known function
and constructions unnecessarily obscuring the subject matter of the
present invention will be avoided hereinafter. Also, the terms used
herein are defined in consideration of the function of the present
invention, which may vary according to an intention of a user or an
operator or according to custom. Thus, definition of such terms
should be made based on content throughout the specification, which
refers to a compressor unit including a gear rotor and a compressor
system using the same according to embodiments of the present
invention.
[0025] The following list is an explanation of reference numerals
used throughout the drawings and the detailed description:
[0026] 1: first suction port
[0027] 2: first suction port slot
[0028] 3: second suction port
[0029] 4: second suction port slot
[0030] 5: first discharge port
[0031] 6: first discharge port compression ratio adjustment
slot
[0032] 7: compressed air resistance preventing slot for first
discharge port
[0033] 8: second discharge port
[0034] 9: second discharge port compression ratio adjustment
slot
[0035] 10: compressed air resistance preventing slot for second
discharge port
[0036] 11: oil injection port
[0037] 12: compressor unit
[0038] 13: third rotor
[0039] 14: second rotor
[0040] 15: first rotor
[0041] 16: shaft center
[0042] 17: casing
[0043] 18: trochoidal rotor assembly
[0044] 19: compressor front cover
[0045] 20: driving shaft
[0046] 21: driving unit
[0047] 22: oil separator and oil tank
[0048] 23: compressed air storage tank
[0049] 24: connection pipe
[0050] Now, an embodiment of the present invention will be
described hereinafter in more detail with reference to the
accompanying drawings.
[0051] FIG. 1 is a view illustrating a compressor unit including a
gear rotor in accordance with an embodiment of the present
invention, FIG. 2 is a view illustrating the construction of a
front cover of the construction of a front cover of the compressor
unit shown in FIG. 1, FIG. 3 is a view illustrating the
construction of a rotor of the compressor shown in FIG. 1, FIG. 4
is a view illustrating a side of the compressor shown in FIG. 1,
and FIG. 5 is a block diagram illustrating the construction of a
compressor system including a gear rotor accordance with an
embodiment of the present invention.
[0052] Referring to FIGS. 1 to 5, a compressor unit 12 according to
an embodiment of the present invention includes a trochoidal rotor
assembly 18 in which three trochoidal rotors 14, 13 and 15 are
engaged with each other, and a casing 17 that sealingly
accommodates the assembly 18 therein. The casing 17 is fabricated
in a cylindrical shape having a predetermined diameter.
[0053] The trochoidal rotor assembly 18 includes a first rotor 15,
a second rotor 14 that accommodates the first rotor 15 at an
eccentric position therein, and a third rotor 13 that accommodates
the second rotor 14 at an eccentric position therein.
[0054] Further, similar to a typical trochoidal gear pump, the
first rotor 15 and the second rotor 14 are engaged with each other,
and simultaneously are in line contact with each other. The third
rotor 13 is in line contact with the second rotor 14 while being
engaged with the second rotor 14. A stationary shaft is securely
fixed to a front cover 19 of the compressor unit by a shaft center
16 at a rotary center axis of the first rotor 15.
[0055] In addition, a driving shaft 20 extends in a longitudinal
direction in a state of being joined to the third rotor 13 such
that the driving shaft 20 is protruded to the outside of the casing
17 by a predetermined length while passing through the casing 17 as
shown in FIG. 4. The driving shaft 20 is axially rotated by
receiving a torque from an external driving unit 21 such that the
first, second and third rotors 15, 14, and 13 are rotated together
with the driving shaft 20. Thus, it can be seen from FIG. 5 that
the driving shaft 20 of the compressor unit 12 is connected to the
driving unit 21. The driving unit 21 is a motor or engine that can
provide a torque.
[0056] In addition, first and second suction ports 1 and 3 are all
opened, and a second discharge port 8 is fluidically connected to
an oil separator and oil tank 22. Fluid discharged upon the
rotation of the first, second and third rotors increases the
internal pressure of the oil separator and oil tank 22 through a
second discharge port 8 to cause lubricant oil contained in the oil
separator and oil tank 22 to be supplied the third and second
rotors 13 and 14 through a lubricant oil injection port 11. The oil
separator and oil tank 22 is connected to the compressed air
storage tank 23. The compressed air storage tank 23 serves to
temporarily store the compressed gas discharged from the compressor
unit 12, and may not be installed according to embodiments.
[0057] In the case where the compressed air storage tank 23 is not
installed in a compressor system according to the present
invention, the oil separator and oil tank 22 is directly connected
to a demand place requiring compressed air by a connection pipe 24
for discharge of air. In addition, when high-pressure air is not
required, the connection between the second suction port 3 and the
first discharge port 5 is interrupted, and the first suction port 1
and the second suction port 3 are fluidically connected to each
other and the second discharge port 8 and the first discharge port
5 are fluidically connected to each other such that low-pressure
air is used in a one-stage compression manner.
[0058] Further, as described above, since the first and second
suction ports 3 and 1 are fluidically connected to each other, the
volume of air sucked is increased as much such that low-pressure
compressed air can be discharged in a large amount at a time. The
compressor unit as constructed above is suitable for a demand place
requiring a large quantity of low-pressure and high-pressure
compressed air for a limited time period. Further, as described
above, low-pressure and high-pressure compressed air can be simply
produced through the fluidical connections between the first and
second suction ports 3 and 1, and between the first and second
discharge ports 5 and 8. The detailed driving mechanism of the
first, second and third rotors included in the compressor unit 12
will be described later with reference to FIG.6.
[0059] Referring to FIG. 5, it can be seen that the first discharge
port 5 is fluidically connected to the second suction port 3
through the connection pipe 24. Moreover, the second discharge port
8 is connected to the oil separator and oil tank 22, and is
connected to the compressed air storage tank 23 through the
connection pipe 24.
[0060] In the above construction, when the driving shaft 20 is
axially rotated by the driving unit 21, external air is sucked into
the first suction port 1. The air sucked into the first suction
port 1 flows along a first suction port slot 2 penetratingly formed
in the front cover 19 of the compressor unit to cause the sucked
air to be supplied in a maximum amount supplied between the third
rotor 13 and the second rotor 14 without any fluid resistance as
shown in FIGS. 2 to 4. The first suction port slot 2 of the front
cover 19 is used to prevent resistance of the sucked air. The
sucked air is primarily compressed while being circulated in the
inside of the casing 17 between the second rotor 14 and the third
rotor 13, and then is discharged through the first discharge port
5. In this case, the compressed gas first reaches a compression
ratio adjustment slot 6 of the first discharge port 5 before
reaching the first discharge port 5. The aim of the compression
ratio adjustment slot 6 is to adjust the compression ratio of the
compressed air, the amount of air discharged primarily, and the
amount of air sucked secondarily. The length of the compression
ratio adjustment slot 6 varies depending on the adjustment amount
of the compressed air. A compressed air resistance preventing slot
7 for the first discharge port 5 is penetratingly formed in the
front cover 19 of the compressor unit so as to prevent compression
of air remained after being discharged through the first discharge
port 5 as shown in FIG. 2. The aim of the compressed air resistance
preventing slot 7 is to smoothly discharge lubricant oil supplied
while receiving rotation resistance of the rotors by compression of
the compressed air that is not totally discharged from the first
discharge port 5.
[0061] The compressed air discharged through the first discharge
port 5 is moved to the second suction port 3 through the connection
pipe 24, and is sucked between the second rotor and the first rotor
along a second suction port slot 4 penetratingly formed therein
without any fluid suction resistance as shown in FIGS. 2 and 4. The
aim of the second suction port slot 4 is to prevent suction
resistance of the sucked compressed air. The sucked compressed air
is again compressed between the first rotor and the second rotor,
and reaches a compression ratio adjustment slot 9 of the second
discharge port 8. The aim of the compression ratio adjustment slot
9 is to adjust the compression ratio. Then, the compressed air is
discharged to the second discharge port 8 via the compression ratio
adjustment slot 9, and the compressed air and oil that is not
discharged but remained in the compression ratio adjustment slot 9
is discharged through a compressed air resistance preventing slot
10 for the second discharge port 8. The aim of the compressed air
resistance preventing slot 10 for second discharge port is to
remove rotation resistance of the rotors by compression of the
compressed air and oil that is remained and to smoothly rotate the
rotors. When the compressed air is discharged to the outside of the
casing 17 through the second discharge port 8 and is supplied to
the oil separator and oil tank 22, the internal pressure of the oil
separator and oil tank 22 is increased to cause the lubricant oil
contained in the oil separator and oil tank 22 to be supplied
between the third rotor and the second rotor through the oil
injection port 11 of the compressor front cover 19. In this case,
since the third rotor and the second rotor are first opened, the
inside of the oil separator and oil tank 22 become a vacuum state
to cause the lubricant oil to be smoothly supplied between the
third rotor and the second rotor due to the internal pressure of
the oil separator and oil tank 22.
[0062] The compressed air collected in the oil separator and oil
tank 22 is moved to and is temporarily stored in the compressed air
storage tank 23 through the connection pipe 24. In the case where
the compressed air needs not to be stored in the compressed air
storage tank 23, it may not be installed.
[0063] FIG. 6 shows a compression mechanism of the compressor
system shown in FIG. 5.
[0064] The operation mechanism of the compressor unit shown in FIG.
5 is as follows. Working fluid is simultaneously sucked into two
suction ports and is simultaneously discharged to two discharge
ports.
[0065] As shown in FIG. 6, when the driving shaft 20 is rotated,
the trochoidal rotor assembly 18 is rotated at its entirety
together with the driving shaft 20. Then, the spaces defined
between the first rotor 15 and the second rotor 14 and between the
second rotor 14 and the third rotor 13, where the second and first
suction ports 3 and 1 are positioned, are widened. Thus, the
pressure between the first, second and third rotors 15, 14 and 13
is decreased to cause external working fluid to be introduced into
the casing 17 through the first and second suction ports 1 and 3 as
shown in FIG. 6a.
[0066] In this state, when the driving shaft 20 continues to be
rotated, the working fluid is compressed while being rotated in a
state of being caught between the first, second and the third
rotors 15, 14 and 13, and then approaches the first and second
discharge ports 5 and 8 as shown in FIG. 6b.
[0067] As shown in FIG.6c, when the working fluid being moved in a
state of being caught between the first, second and the third
rotors 15, 14 and 13 finally reaches the first and second discharge
ports 5 and 8, it is simultaneously discharged to the outside
through the two discharge ports 5 and 8 such that the working fluid
is supplied to a demand place or is temporarily stored in the
compressed air storage tank 23.
[0068] FIG. 7 shows another embodiment of a compression mechanism
of the compressor unit shown in FIG. 5.
[0069] The operation mechanism of the compressor unit shown in FIG.
5 is basically, as follows. First, working fluid is allowed to be
sucked into the first suction port 1 so as to be primarily
compressed, and then is secondarily compressed in the casing 17 via
the first discharge port 5 and the second suction port 3. Then, the
working fluid is finally discharged to the second discharge ports
8.
[0070] As shown in FIG. 7a, when the driving shaft 20 is rotated by
the driving unit 21 (see FIG. 5), external working fluid is
introduced into the casing 17 through the first suction port 1.
Then, the working fluid introduced into the casing 17 is compressed
while being moved to the first discharge port 5 in a state of being
caught between second rotor 14 and the third rotor 13 (see FIGS. 7b
and 7c).
[0071] As shown in FIG. 7c, the working fluid that has reached the
first discharge port 5 escapes to the outside through the first
discharge port 5 and is moved to the second suction port 3 through
the connection pipe 24.
[0072] Then, the working fluid moved to the second suction port 3
is sucked between the first rotor 15 and the second rotor 14 as
shown FIG. 7d. Thereafter, as shown in FIG. 7e, the sucked working
fluid is again compressed between the first rotor 15 and the second
rotor 14, and then is moved to the second discharge ports 8 so as
to be discharged to the outside (see FIG. 7f).
[0073] As described above, the compressor unit according to an
embodiment of the present invention can increase the discharge
speed of the working fluid or can compress the working fluid in a
two-stage compression manner to implement a high-speed,
high-pressure compression capability.
[0074] The compressor unit including a gear rotor and the
compressor system using the same as described above can be applied
to industrial compressors, two-stage expanders, two-stage fluid
pumps, vacuum pumps, companders (combined compressors and
expanders), and expander pumps (external expanders and internal
pumps), which can implement a high-speed, high-pressure compression
capability.
[0075] As described above, the compressor unit including a gear
rotor and the compressor system using the same in accordance with
embodiments of the present invention has the following advantageous
effects.
[0076] First, the present invention is constructed as a triple
trochoidal rotor such that working fluid can be compressed in a
two-stage compression manner to enable the working fluid to be
supplied at high pressure.
[0077] Second, the present invention is constructed as a triple
trochoidal rotor such that the volume of working fluid sucked and
discharged can be increased to provide a high-speed, high-pressure
compression capability.
[0078] While the present invention has been described in connection
with embodiments illustrated in the drawings, the terminology used
herein is for the purpose of describing particular embodiments only
and is not intended to limit the meaning of the invention or limit
the scope of the invention disclosed in the claims. Also, it is to
be understood that various equivalent modifications and variations
of the embodiments can be made by a person having an ordinary skill
in the art without departing from the spirit and scope of the
present invention. Therefore, various embodiments of the present
invention are merely provided as examples, and the true technical
scope of the present invention should be defined by the technical
spirit of the appended claims and their equivalents.
* * * * *