U.S. patent application number 12/781051 was filed with the patent office on 2011-11-17 for cam-type pump structure for a refrigerant recycling machine.
This patent application is currently assigned to SUN-WONDER INDUSTRIAL CO.. Invention is credited to An Chao CHANG.
Application Number | 20110280754 12/781051 |
Document ID | / |
Family ID | 44911948 |
Filed Date | 2011-11-17 |
United States Patent
Application |
20110280754 |
Kind Code |
A1 |
CHANG; An Chao |
November 17, 2011 |
CAM-TYPE PUMP STRUCTURE FOR A REFRIGERANT RECYCLING MACHINE
Abstract
A cam-type pump structure for a refrigerant recycling machine
includes a cam device driven by a motor for pistons to be
reciprocated in conjunction with cylinders and valve bodies so as
to pump liquid. The pump apparatus is compact in size and has high
efficiency for the demand of recycling refrigerant.
Inventors: |
CHANG; An Chao; (Guishan
Township, TW) |
Assignee: |
SUN-WONDER INDUSTRIAL CO.
|
Family ID: |
44911948 |
Appl. No.: |
12/781051 |
Filed: |
May 17, 2010 |
Current U.S.
Class: |
417/510 |
Current CPC
Class: |
F04B 1/0413
20130101 |
Class at
Publication: |
417/510 |
International
Class: |
F04B 7/00 20060101
F04B007/00 |
Claims
1. A cam-type pump structure for a refrigerant recycling machine,
comprising a main body, a cam device and a cylinder; the main body
comprising a motor, the motor having an output end provided with a
shaft, the main body having a space therein, the shaft of the motor
being disposed in the space, the cam device being inserted on the
shaft, the main body having an opening at one side thereof; the cam
device comprising a central rotating body and two eccentric
rotating bodies, each of the two eccentric rotating bodies being
connected with a piston, the cam device having an axial hole along
a central axis thereof, the shaft being inserted through the axial
hole and the eccentric rotating bodies; and the cylinder being
coupled to the opening of the main body, the cylinder having a
chamber therein to receive the piston for reciprocation.
2. The cam-type pump structure for a refrigerant recycling machine
as claimed in claim 1, wherein the main body has a casing shape, a
fan being provided at an outer side of the motor, the main body
having a ring portion at an outer edge of the space, the main body
further comprising a plate and a rubber washer associated with an
oil seal ring to seal the space, the plate and the rubber washer
being connected to the ring portion with screws.
3. The cam-type pump structure for a refrigerant recycling machine
as claimed in claim 1, wherein a distal end of the shaft is
provided with a shaft bearing.
4. The cam-type pump structure for a refrigerant recycling machine
as claimed in claim 1, wherein the two eccentric rotating bodies of
the cam device are located at two sides of the central rotating
body.
5. The cam-type pump structure for a refrigerant recycling machine
as claimed in claim 1, wherein a bearing is provided at an outer
end of each of the eccentric rotating bodies, an outer sleeve being
provided at an outer end of the bearing, the outer sleeve having a
protrusion at one end thereof, the piston being located at a distal
end of the protrusion.
6. The cam-type pump structure for a refrigerant recycling machine
as claimed in claim 1, wherein the axial hole is located at the
center of the central rotating body.
7. The cam-type pump structure for a refrigerant recycling machine
as claimed in claim 1, wherein the cylinder is connected with a
valve body, the inside of the cylinder communicating with the
inside of the valve body, the valve body having an inlet and an
outlet.
8. The cam-type pump structure for a refrigerant recycling machine
as claimed in claim 1, wherein the centers of the two eccentric
rotating bodies are located at different axes.
9. The cam-type pump structure for a refrigerant recycling machine
as claimed in claim 1, wherein the centers of the two eccentric
rotating bodies are located at the same axis.
10. The cam-type pump structure for a refrigerant recycling machine
as claimed in claim 9, wherein one side of the central rotating
body is provided with a counterweight block, the counterweight
block being located at an opposite side relative to the eccentric
rotating bodies for balance, the side of the central rotating body
having an engaging groove and a threaded hole in the engaging
groove, the engaging groove being adapted to receive a rib of the
counterweight block, the counterweight block having a hole thereon
for insertion of a screw so that the counterweight block is coupled
to the central rotating body.
Description
BACKGROUND OF THE INVENTION
[0001] 1. Field of the Invention
[0002] The present invention relates to a cam-type pump structure
for a refrigerant recycling machine. In particular, a pump
apparatus uses a cam-type structure for pistons to be reciprocated
in the same direction or in opposite directions so as to pump
refrigerant.
[0003] 2. Description of the Prior Art
[0004] Refrigerant is widely used in our daily living, such as
domestic refrigerators, air conditioners, refrigerating equipment
or car air conditioners. When refrigerators or air conditioners
need maintenance, it is required to drain out the refrigerant. This
not only pollutes the ambient air but also brings poisonous
substances to harm the human body when the refrigerant is burned at
a high temperature. Recently, there is a refrigerant recycling
machine on the market to pump the refrigerant or the like into a
specific container, which conforms to the operation safety and
protects the global environment.
[0005] The existing refrigerant recycling machine doesn't have a
proper design for its inside construction. Accordingly, the
inventor of the present invention has devoted himself based on his
many years of practical experiences to improve the existing
products.
SUMMARY OF THE INVENTION
[0006] The primary object of the present invention is to provide a
cam-type pump structure for a refrigerant recycling machine, which
comprises two pairs of pistons and cylinders. The two pistons are
driven by a cam device. When the cam device is activated, the two
pistons are reciprocated synchronously. The pistons are
reciprocated in the same direction or in opposite directions. By
the motion of the pistons, the present invention provides a high
efficiency and is compact in size.
[0007] In order to achieve the object, the present invention
comprises a main body. The main body comprises a motor at one end
thereof. The motor has an output end which is a shaft. The main
body has a space therein. The shaft of the motor is disposed in the
space. A cam device is inserted on the shaft. The cam device
comprises a central rotating body and two eccentric rotating bodies
at two sides of the central rotating body. A bearing is provided at
an outer end of each of the eccentric rotating bodies. An outer
sleeve is provided at an outer end of the bearing. The outer sleeve
has a protrusion at one end thereof and a piston at a distal end of
the protrusion. The main body has a pair of openings at two sides
thereof. Each opening is connected with a cylinder. The cylinder
has a chamber therein to receive the piston for reciprocation.
[0008] Preferably, a fan is provided at an outer end of the motor
to lower the temperature and dissipate the heat when in
operation.
[0009] Preferably, the main body has a ring portion at an outer
edge of the space. The ring portion is covered with a plate to seal
the space.
[0010] Preferably, each cylinder is connected with a valve body.
The inside of the cylinder communicates with the inside of the
valve body. The valve body has an inlet and an outlet. The piston
is reciprocated in the cylinder to form pressure for the valve body
to provide a pump function.
[0011] Preferably, the center of the central rotating body of the
cam device is formed with an axial hole for insertion of the shaft
of the motor. The axial hole penetrates each eccentric rotating
body and isn't located at the center of each eccentric rotating
body.
[0012] Preferably, the centers of the two eccentric rotating bodies
are located at different axes. When the shaft is turned to drive
the central rotating body, the two eccentric rotating bodies will
be turned eccentrically at different angles and the two pistons at
the two sides of the cam device will be reciprocated in opposite
directions. In this way, the two valve bodies are to pump
synchronously, providing a better pump function.
[0013] Alternatively, the centers of the two eccentric rotating
bodies are located at the same axis. When the shaft is turned to
drive the central rotating body, the two eccentric rotating bodies
will be turned eccentrically at the same angle and the two pistons
at the two sides of the cam device are reciprocated in the same
direction. In this way, the two valve bodies are to pump in turn,
providing a smooth operation.
BRIEF DESCRIPTION OF THE DRAWINGS
[0014] FIG. 1 is a perspective view of the present invention;
[0015] FIG. 2 is an exploded view of the present invention;
[0016] FIG. 3 is an exploded view of a cam device of the present
invention;
[0017] FIG. 4 is a cross-sectional showing the cam device of the
present invention in an operating status;
[0018] FIG. 5 is another cross-sectional showing the cam device of
the present invention in an operating status;
[0019] FIG. 6 is an exploded view of a cam device according to
another embodiment of the present invention; and
[0020] FIG. 7 is a cross-sectional view of FIG. 6 showing the cam
device of the present invention in an operating status.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
[0021] Embodiments of the present invention will now be described,
by way of example only, with reference to the accompanying
drawings.
[0022] As shown in FIGS. 1 to 4, a cam-type pump structure for a
refrigerant recycling machine according to a first preferred
embodiment of the present invention comprises a main body 1, a cam
device 2, a cylinder 3 and a valve body 4.
[0023] The main body 1 has a casing shape and comprises a motor 11
at one end thereof. A fan 12 is provided at an outer side of the
motor 11. The motor 11 has an output end which is a shaft 14. The
main body 1 has a space 13 therein. The shaft 14 of the motor 11 is
disposed in the space 13. The cam device 2 is inserted on the shaft
14. A distal end of the shaft 14 is provided with a shaft bearing
141. The main body 1 has a pair of openings 15 at two sides thereof
to receive the cylinder 3. The main body 1 has a ring portion 16 at
an outer edge of the space 13. The main body 1 further comprises a
plate 17 and a rubber washer 171 associated with an oil seal ring
161 to seal the space 13. The plate 17 and the rubber washer 171
are connected to the ring portion 16 with screws 172.
[0024] The cam device 2 comprises a central rotating body 21, a
pair of eccentric rotating bodies 22 at two sides of the central
rotating body 21, a pair of bearings 24 next to the pair of
eccentric rotating bodies 22 and a pair of outer sleeves 25 next to
the pair of the bearings 24. Each outer sleeve 25 has a protrusion
26 at one end thereof and a piston 27 at a distal end of the
protrusion 26. The cam device 2 has an axial hole 23 along a
central axis thereof. In this embodiment, the axial hole 23
penetrates through the center of the central rotating body 21, but
not through the center of each eccentric rotating body 22.
[0025] The cylinder 3 is coupled to the opening 15 of the main body
1. The cylinder 3 has a chamber 31 therein to receive the piston 27
for reciprocating motion. Preferably, there are two openings 15 in
this embodiment, so the cylinder 3 corresponds in number to the
opening 15.
[0026] The valve body 4 is mounted on the cylinder 3. The inside of
the cylinder 3 communicates with the inside of the valve body 4.
The valve body 4 has an inlet 41 and an outlet 42. The piston 27 is
reciprocated in the cylinder 3 to form pressure for the valve body
4 to provide a pump function.
[0027] When the motor 11 is started, the shaft 14 will be driven to
turn the cam device 2 on the shaft 14. The central rotating body 21
and the two eccentric rotating bodies 22 are turned synchronously.
Because the axial hole 23 is not disposed at the center of each
eccentric rotating body 22, the cam device 2 is turned
eccentrically. As shown in FIG. 4 and FIG. 5, the two eccentric
rotating bodies 22 are in an eccentric motion, and the two pistons
27 at the two sides of the cam device 2 are reciprocated in
opposite directions, namely, they are synchronously turned inward
or outward, such that the two valve bodies 4 are to pump
synchronously. In this motion way, the two valve bodies 4 provide
more efficiency to pump than a single piston with a single
valve.
[0028] FIG. 6 shows a second embodiment of the present invention,
which is substantially similar to the first embodiment with the
exceptions described hereinafter. A cam device 5 comprises a
central rotating body 51, a pair of eccentric rotating bodies 52 at
two sides of the central rotating body 51, a pair of bearings 54
next to the pair of eccentric rotating bodies 52 and a pair of
outer sleeves 55 next to the pair of the bearings 54. Each outer
sleeve 55 has a protrusion 56 at one end thereof and a piston 57 at
a distal end of the protrusion 56. The cam device 5 has an axial
hole 53 along a central axis thereof. In this embodiment, the axial
hole 53 penetrates through the center of the central rotating body
51, but not through the center of each eccentric rotating body 52.
In particular, the centers of the two eccentric rotating bodies 52
are located at the same axis, namely, the two eccentric rotating
bodies 52 are eccentric toward the same side relative to the axial
hole 53 simultaneously. In addition, the central rotating body 51
has an engaging groove 511 on one side thereof and a threaded hole
512 in the engaging groove 511. The engaging groove 511 is adapted
to receive a rib 581 of a counterweight block 58. The counterweight
block 58 has a hole 582 thereon for insertion of a screw 583, such
that the counterweight block 58 is coupled to the central rotating
body 51. Because the two eccentric rotating bodies 52 are eccentric
toward the same side relative to the axial hole 53 simultaneously,
the two eccentric rotating bodies 52 will be turned eccentrically
when the shaft 14 is turned. In order to solve this problem, in
this embodiment the counterweight block 58 is located at an
opposite side relative to the eccentric rotating bodies 52 for
balance.
[0029] When the motor 11 is started, the shaft 14 will be driven to
turn the cam device 5 on the shaft 14. The central rotating body 51
and the two eccentric rotating bodies 52 are turned synchronously.
Because the axial hole 53 is not disposed at the center of each
eccentric rotating body 52, the cam device 5 is turned
eccentrically. As shown in FIG. 7, the centers of the two eccentric
rotating bodies 52 are located at the same axis, and the two
pistons 57 at the two sides of the cam device 5 are reciprocated in
the same direction, namely, one piston 57 is turned inward and the
other piston 57 is turned outward, such that the two valve bodies 4
are to pump in turn. In this motion way, the motion directions of
the cam device 5 and the piston 57 are the same, providing a smooth
operation.
[0030] Although particular embodiments of the present invention
have been described in detail for purposes of illustration, various
modifications and enhancements may be made without departing from
the spirit and scope of the present invention. Accordingly, the
present invention is not to be limited except as by the appended
claims.
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