U.S. patent application number 13/644660 was filed with the patent office on 2013-04-11 for gerotor pump.
This patent application is currently assigned to COAVIS. The applicant listed for this patent is COAVIS. Invention is credited to Hyuntae LEE.
Application Number | 20130089452 13/644660 |
Document ID | / |
Family ID | 47898932 |
Filed Date | 2013-04-11 |
United States Patent
Application |
20130089452 |
Kind Code |
A1 |
LEE; Hyuntae |
April 11, 2013 |
GEROTOR PUMP
Abstract
Provided is a gerotor pump including an inner rotor connected to
a driving axis of a motor to transfer rotation force, an outer
rotor formed at an outer side of the inner rotor, and a casing
receiving the inner and outer rotors therein and provided with an
inlet and an outlet, the inner and outer rotors forming several
closed chambers while eccentrically rotating, having a
predetermined clearance therebetween, to transfer a fluid, wherein
a pressure chamber is formed in the casing in a direction in which
force acts on the outer rotor by pressure of the fluid to offset
the force, such that frictional force between the outer rotor and
the casing decreases, thereby making it possible to improve
performance and efficiency of the pump.
Inventors: |
LEE; Hyuntae;
(Chungcheongnam-do, KR) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
COAVIS; |
Chungnam |
|
KR |
|
|
Assignee: |
COAVIS
Chungnam
KR
|
Family ID: |
47898932 |
Appl. No.: |
13/644660 |
Filed: |
October 4, 2012 |
Current U.S.
Class: |
418/164 |
Current CPC
Class: |
F04C 15/068 20130101;
F04C 11/008 20130101; F04C 2/102 20130101; F04C 15/0042
20130101 |
Class at
Publication: |
418/164 |
International
Class: |
F04C 2/22 20060101
F04C002/22 |
Foreign Application Data
Date |
Code |
Application Number |
Oct 7, 2011 |
KR |
10-2011-0102699 |
Claims
1. A gerotor pump comprising: a lower casing having an inhalation
channel formed in an upper surface thereof so as to be in
communication with an inlet formed at one side thereof; an upper
casing coupled to an upper side of the lower casing and having a
discharge channel formed in a lower surface thereof so as to be in
communication with an outlet formed at one side thereof; and a
gerotor received between the upper and lower casings and having
inner and outer rotors engaged with each other so as to
eccentrically rotate, wherein the upper casing includes a pressure
chamber formed at a discharge chamber side of an inner peripheral
surface thereof contacting the outer rotor, the pressure chamber
being in communication with the outlet of the upper casing.
2. A gerotor pump comprising: a lower casing having an upper
portion formed to be opened and having an inhalation channel formed
in an upper surface thereof so as to be in communication with an
inlet formed at one side thereof; a gerotor received in the lower
casing and having inner and outer rotors engaged with each other so
as to eccentrically rotate; and a flexible plate coupled to an
upper surface of the gerotor and made of a flexible material so as
to selectively form a discharge channel by internal pressure of the
gerotor, wherein the lower casing includes a pressure chamber
formed at a discharge chamber side of an inner peripheral surface
thereof contacting the outer rotor, the pressure chamber being in
communication with the discharge channel.
Description
CROSS-REFERENCE TO RELATED APPLICATIONS
[0001] This application claims priority under 35 U.S.C. .sctn.119
to Korean Patent Application No. 10-2011-0102699, filed on Oct. 7,
2011, in the Korean Intellectual Property Office, the disclosure of
which is incorporated herein by reference in its entirety.
TECHNICAL FIELD
[0002] The following disclosure relates to a gerotor pump, and more
particularly, to a gerotor pump including an inner rotor connected
to a driving axis of a motor to transfer rotation force, an outer
rotor formed at an outer side of the inner rotor, and a casing
receiving the inner and outer rotors therein and provided with an
inlet and an outlet, the inner and outer rotors forming several
closed chambers while eccentrically rotating, having a
predetermined clearance therebetween, to transfer a fluid, wherein
a pressure chamber is formed in the casing in a direction in which
force acts on the outer rotor by pressure of the fluid to offset
the force, such that frictional force between the outer rotor and
the casing decreases, thereby making it possible to improve
performance and efficiency of the pump.
BACKGROUND
[0003] A gerotor pump, which is a typical positive displacement
pump having a flow amount changed in proportion to a rotation speed
of a motor, is configured to include an inner rotor connected to a
driving axis of the motor to transfer rotation force and an outer
rotor, wherein the inner and outer rotors form several closed
pumping chambers while eccentrically rotating, having a
predetermined clearance therebetween, to transfer a fluid.
[0004] That is, the rotors rotate around their central axes, and a
pumping chamber becomes large at an inhalation side and becomes
small at a discharge side in a rotation direction to transmit the
fluid in a uniform fluid amount.
[0005] More specifically, as shown in FIG. 1, an outer side of an
inner rotor 10 of a general gerotor pump is provided with N lobes
and an inner side of an outer rotor 20 thereof is provided with N+1
lobes 21, and the lobes 11 and 21 are engaged with each other, such
that the inner and outer rotors 10 and 20 rotate in a rotation
ratio of (N+1)/N (See Korean Patent No. 10-0695934).
[0006] In addition, the inner and outer rotors 10 and 20 rotate
while having a predetermined eccentricity. Due to this
eccentricity, a pumping chamber A capable of transferring fluid
fuel is formed between the inner and outer rotors 10 and 20.
[0007] Here, as shown in FIG. 2, the inner rotor 10 and the outer
rotor 20 are seated in a casing 30, an inhalation channel 31 and a
discharge channel 32 are formed in the casing 30 so as to be
symmetrical to each other, and a sealing plate 40 is closely
adhered to the inner and outer rotors 10 and 20.
[0008] Therefore, a volume of the pumping chamber A repeatedly
increases and decreases during rotation of the inner and outer
rotors 10 and 20. Here, a portion at which the volume of the
pumping chamber increases becomes a vacuum state, such that a fluid
is inhaled through the inhalation channel 31, and a portion at
which the volume of the pumping chamber decreases has increased
pressure, such that the fluid is discharged through the discharge
channel 32.
[0009] However, force pulling the outer rotor 20 acts at a portion
at which the pressure of the pumping chamber A decreases while the
volume thereof increases, and force pushing the outer rotor 20
outwardly acts at a portion at which the pressure of the pumping
chamber A increases while the volume thereof decreases.
[0010] Therefore, fractional force increases on a contact surface
between the outer rotor 20 and the casing 30, such that performance
of the pump is deteriorated, and abrasion on the contact surface
occurs, such that a lifespan of the pump decreases.
RELATED ART DOCUMENT
Patent Document
[0011] KR 10-0695934 B1 (Mar. 9, 2007)
SUMMARY
[0012] An embodiment of the present invention is directed to
providing a gerotor pump including an inner rotor connected to a
driving axis of a motor to transfer rotation force, an outer rotor
formed at an outer side of the inner rotor, and a casing receiving
the inner and outer rotors therein and provided with an inlet and
an outlet, the inner and outer rotors forming several closed
chambers while eccentrically rotating, having a predetermined
clearance therebetween, to transfer a fluid, wherein a pressure
chamber is formed in the casing in a direction in which force acts
on the outer rotor by pressure of the fluid to offset the force,
such that frictional force between the outer rotor and the casing
may decrease.
[0013] In one general aspect, a gerotor pump includes: a lower
casing 100 having an inhalation channel 120 formed in an upper
surface thereof so as to be in communication with an inlet 110
formed at one side thereof; an upper casing 200 coupled to an upper
side of the lower casing 100 and having a discharge channel 220
formed in a lower surface thereof so as to be in communication with
an outlet 210 formed at one side thereof; and a gerotor 300
received between the upper and lower casings 100 and 200 and having
inner and outer rotors 310 and 320 engaged with each other so as to
eccentrically rotate, wherein the upper casing 200 includes a
pressure chamber P formed at a discharge chamber D side of an inner
peripheral surface thereof contacting the outer rotor 320, the
pressure chamber P being in communication with the outlet 210 of
the upper casing 200.
[0014] In another general aspect, a gerotor pump includes: a lower
casing 100 having an upper portion formed to be opened and having
an inhalation channel 120 formed in an upper surface thereof so as
to be in communication with an inlet 110 formed at one side
thereof; a gerotor 300 received in the lower casing 100 and having
inner and outer rotors 310 and 320 engaged with each other so as to
eccentrically rotate; and a flexible plate 400 coupled to an upper
surface of the gerotor 300 and made of a flexible material so as to
selectively form a discharge channel 410 by internal pressure of
the gerotor 300, wherein the lower casing 100 includes a pressure
chamber P formed at a discharge chamber D side of an inner
peripheral surface thereof contacting the outer rotor 320, the
pressure chamber P being in communication with the discharge
channel 410.
BRIEF DESCRIPTION OF THE DRAWINGS
[0015] FIG. 1 is a cross-sectional view showing an inner rotor and
an outer rotor of a gerotor pump according to the related art.
[0016] FIG. 2 is a cross-sectional view showing the gerotor pump
according to the related art.
[0017] FIG. 3 is a cross-sectional view showing a gerotor pump
according to an exemplary embodiment of the present invention.
[0018] FIG. 4 is a cross-sectional view showing a pressure chamber
formed in a case according to the exemplary embodiment of the
present invention.
[0019] FIG. 5 is a cross-sectional view showing a gerotor pump
according to another exemplary embodiment of the present
invention.
TABLE-US-00001 [0020] [Detailed Description of Main Elements] 100:
lower casing 110: inlet 120: inhalation channel 130: pressure
channel 200: upper casing 210: outlet 220: discharge channel 230:
pressure channel 300: gerotor 310: inner rotor 311: lobe 320: outer
rotor 321: lobe 400: flexible plate 410: discharge channel 500:
armature 510: shaft 600: pump housing I: inhalation chamber D:
discharge chamber P: pressure chamber S: stop portion
DETAILED DESCRIPTION OF EMBODIMENTS
[0021] Hereinafter, a gerotor pump according to an exemplary
embodiment of the present invention as described above will be
described in detail with reference to the accompanying
drawings.
[0022] FIG. 3 is a cross-sectional view showing a gerotor pump
according to an exemplary embodiment of the present invention.
[0023] As shown in FIG. 3, the gerotor pump according to the
exemplary embodiment of the present invention is configured to
include a lower casing 100 having an inhalation channel 120 formed
in an upper surface thereof so as to be in communication with an
inlet 110 formed at one side thereof; an upper casing 200 coupled
to an upper side of the lower casing 100 and having a discharge
channel 220 formed in a lower surface thereof so as to be in
communication with an outlet 210 formed at one side thereof; and a
gerotor 300 received between the upper and lower casings 100 and
200 and having inner and outer rotors 310 and 320 engaged with each
other so as to eccentrically rotate.
[0024] Here, the upper casing 200 includes a pressure chamber P
formed at a discharge chamber D side of an inner peripheral surface
thereof contacting the outer rotor 320, wherein the pressure
chamber P is formed to be in communication with the outlet 210 of
the upper casing 200.
[0025] First, the lower casing 100 includes the inlet 110 formed at
one side thereof so as to penetrate through upper and lower
surfaces thereof and includes the inhalation channel 120 formed in
a groove shape in the upper surface so as to be in communication
with the inlet 110.
[0026] The upper casing 200 is coupled to be closely adhered to the
upper surface of the lower casing 100 and is configured to have an
internal space formed at a lower side thereof so that the gerotor
300 is received therein.
[0027] In addition, the upper casing 200 includes the outlet 210
formed at one side thereof so as to penetrate through upper and
lower surfaces thereof and includes the discharge channel 220
formed in the lower surface thereof so as to be in communication
with the outlet 210.
[0028] Here, the gerotor 300 is received and seated in the internal
space of the upper casing 200, the lower and upper casings 100 and
200 are coupled to each other, and the gerotor 300 rotates between
the upper and lower casings 100 and 200.
[0029] In addition, the lower and upper housings 100 and 200 are
inserted into a pump housing 600 in a state in which they are
coupled to each other, such that outer sides thereof are fixed.
[0030] In this case, the gerotor 300 is configured to include the
inner and outer rotors 310 and 320, wherein the inner rotor 310 is
disposed at an inner side of the outer rotor 320.
[0031] In addition, referring to FIG. 4, the inner and outer rotors
310 and 320 are engaged with each other so as to eccentrically
rotate, and the inner rotor 310 rotates in a state in which the
center thereof is fixed to a shaft 510 of an armature 500. As the
inner rotor 310 rotates, the outer rotor 320 eccentrically
rotates.
[0032] In addition, the numbers of lobes 311 and 321 of each of the
inner and outer rotors 310 and 320 are different from each other.
More specifically, the number of lobes 321 of the outer rotor 320
is more than the lobes 311 of the inner rotor 310 by one.
[0033] Therefore, a fluid is inhaled or discharged by a volume
change of a space between the lobes 311 and 321 of the inner and
outer rotors 310 and 320 that are engaged with each other and
rotates.
[0034] In this case, a plurality of inhalation chambers I
corresponding to portions inhaling the fluid while volumes thereof
increases are formed, and a plurality of discharge chambers D
corresponding to portions discharging the fluid while volumes
thereof decreases are formed, between the lobes 311 and 321 of the
inner and outer rotors 310 and 320, based on a portion at which
teeth forms are completely coupled to each other.
[0035] In addition, a stop portion S of which a volume is not
changed is formed at the center of the inhalation chambers I and
the discharge chambers D along a circumferential direction of the
gerotor 300.
[0036] That is, the volume change occurs between the lobes 311 and
321 at the time of rotation of the gerotor 300 due to a difference
between the numbers of lobes 311 and 321 of the inner and outer
rotors 310 and 320, thereby inhaling and discharging the fluid.
[0037] Here, the inhalation channel 120 formed in the lower casing
100 may be lengthily formed in a groove shape in the
circumferential direction so as to be in communication with the
inhalation chamber I, and the discharge channel 220 formed in the
upper casing 200 may be lengthily formed in a groove shape in the
circumferential direction so as to be in communication with the
discharge chamber D.
[0038] Therefore, the fluid is introduced through the inlet 110 of
the lower casing 100, is inhaled to the inhalation chamber I
through the inhalation channel 120, and is compressed while the
volume of the discharge chamber D decreases, such that it is
discharged to the outlet 210 through the discharge channel 220 of
the upper casing 200 and is transferred to an inner portion of the
pump housing 600.
[0039] In this case, due to vacuum pressure generated while the
volume of the inhalation chamber I increases and discharge pressure
generated while the volume of the discharge chamber D, force acts
on the inner and outer rotors 310 and 320 in a specific
direction.
[0040] In addition, the inner and outer rotors 310 and 320 form the
inhalation chambers I, the stop portion S, and the discharge
chambers D while rotating in the upper casing 200. Since the
inhalation chambers I, the stop portion S, and the discharge
chambers D are repeatedly formed at a predetermined region, force
always acts in the same direction.
[0041] That is, as shown in FIG. 4, the force acts on the inner
rotor 310 in a direction toward the inhalation chamber I based on
the center. To the contrary, the force acts on the outer rotor 320
in a direction toward the discharge chamber D based on the
center.
[0042] Here, the inner rotor 310 is fixed in a radial direction by
the shaft 510 of the armature 500, such that frictional force
caused by force due to pressure of the fluid is small. However, the
outer rotor 320 is fixed in the radial direction in a state in
which it contacts the inner peripheral surface of the upper casing
200, such that frictional force caused by force due to pressure of
the fluid is large due to a wide contact area.
[0043] Therefore, in order to decrease the frictional force, force
at which the outer rotor 320 is pushed toward the inner peripheral
surface of the upper casing 200 by the pressure of the fluid needs
to decrease.
[0044] Here, the gerotor pump according to the exemplary embodiment
of the present invention includes the pressure chamber P formed at
the discharge chamber D side of the inner peripheral surface of the
upper casing 200 contacting the outer rotor 320, wherein the
pressure chamber P is formed to be in communication with the outlet
210 of the upper casing 200.
[0045] That is, a pressure channel 230 is formed at one side of the
upper casing 200 and the pressure chamber P is formed to be in
communication with the pressure channel 230, such that the fluid
discharged through the outlet 210 is introduced into the pressure
chamber P along the pressure channel 230.
[0046] Here, the fluid is introduced into the pressure chamber P
along the pressure channel 230, such that the pressure chamber P is
maintained in a state in which it is filled with the fluid, and
pressure of the fluid filled in the pump housing 600 and pressure
of the fluid filled in the pressure chamber P are maintained to be
the same as each other.
[0047] Therefore, force acting on the outer rotor 320 by the
pressure of the fluid in the discharge chamber D and force by the
pressure of the fluid introduced into the pressure chamber P are
offset to each other, such that the frictional force generated due
to the contact between the outer peripheral surface of the outer
rotor 320 and the inner peripheral surface of the upper casing 200
decreases.
[0048] As described above, in the gerotor pump according to the
exemplary embodiment of the present invention, when the inner and
outer rotors form the plurality of closed inhalation chambers and
discharge chambers while eccentrically rotating, having a
predetermined clearance therebetween, to transfer the fluid, the
pressure chamber is formed in the upper casing in a direction in
which the force acts on the outer rotor by the pressure of the
fluid to offset the force, such that the frictional force between
the outer rotor and the upper casing decreases, thereby making it
possible to improve performance and efficiency of the pump.
[0049] Here, in order for the pressure chamber P to offset the
force acting on the outer rotor 320 by the pressure of the fluid,
an area and a position of the pressure chamber P formed to contact
the outer rotor 320 need to be appropriately selected. It is
preferable that the pressure chamber P is formed to be positioned
at a central portion of a thickness of the outer rotor 320 and is
formed to be symmetrical based on a central portion of the
discharge chamber D in the circumferential direction, as shown.
[0050] In addition, a gerotor pump according to another exemplary
embodiment of the present invention is configured to include a
lower casing 100 having an upper portion formed to be opened and
having an inhalation channel 120 formed in an upper surface thereof
so as to be in communication with an inlet 110 formed at one side
thereof; a gerotor 300 received in the lower casing 100 and having
inner and outer rotors 310 and 320 engaged with each other so as to
eccentrically rotate; and a flexible plate 400 coupled to an upper
surface of the gerotor 300 and made of a flexible material so as to
selectively form a discharge channel 410 by internal pressure of
the gerotor 300, wherein the lower casing 100 includes a pressure
chamber P formed at a discharge chamber D side of an inner
peripheral surface thereof contacting the outer rotor 320, the
pressure chamber P being formed to be in communication with the
discharge channel 410.
[0051] The gerotor pump according to another exemplary embodiment
of the present invention is similar to the gerotor pump according
to the exemplary embodiment of the present invention described
above except that the gerotor is received in the lower casing 100
and the flexible plate 400 made of the flexible material is
disposed at an upper side of the gerotor 300, such that the
flexible plate 400 is selectively opened at a portion at which the
discharge chamber D is formed while rotating together with the
gerotor 300 to discharge a fluid, as shown in FIG. 5.
[0052] Here, the flexible plate 400 is coupled to the upper surface
of the gerotor 300 so as to be closely adhered thereto and is made
of the flexible material. Therefore, when pressure in the discharge
chamber D increases while a volume of the discharge chamber D
decreases, a portion of the flexible plate 400 is opened upwardly,
such that the fluid is discharged.
[0053] That is, the discharge channel 410 is not separately formed,
but is an opened space of the flexible plate 400 opened upwardly by
the pressure of the fluid in the discharge chamber D formed in the
gerotor 300 and disposed at an upper side of the discharge chamber
D.
[0054] Here, the pressure chamber P is formed in the lower casing
100, the flexible plate 400 is opened upwardly at the portion at
which the discharge chamber D is formed, such that the discharge
channel 410 is formed, and the discharged fluid is introduced into
the pressure chamber P along the pressure channel 130 formed in the
lower casing 100. Therefore, similar to the exemplary embodiment
described above, force acting on the outer rotor 320 by the
pressure in the discharge chamber D and force by the pressure in
the pressure chamber P are offset to each other, thereby making it
possible to decrease frictional force on a contact surface between
the outer rotor 320 and the lower casing 100.
[0055] In the gerotor pump according to the exemplary embodiment of
the present invention, when the inner and outer rotors form several
closed pumping chambers while eccentrically rotating, having a
predetermined clearance therebetween, to transfer the fluid, the
pressure chamber is formed in the casing in a direction in which
the force acts on the outer rotor by the pressure of the fluid to
offset the force, such that the frictional force between the outer
rotor and the casing decreases, thereby making it possible to
improve performance and efficiency of the pump.
[0056] The present invention is not limited to the above-mentioned
exemplary embodiments but may be variously applied, and may be
variously modified by those skilled in the art to which the present
invention pertains without departing from the gist of the present
invention claimed in the claims.
* * * * *