Pumps – Motor driven – Electric or magnetic motor
Reexamination Certificate
2001-05-31
2003-01-14
Freay, Charles G. (Department: 3746)
Pumps
Motor driven
Electric or magnetic motor
C417S093000, C417S470000
Reexamination Certificate
active
06506033
ABSTRACT:
BACKGROUND OF THE INVENTION
a) Field of the Invention
The present invention relates to a miniature pump.
b) Description of the Prior Art
Out of conventional miniature pumps, a pump disclosed by Japanese Patent Kokai Publication No. Sho 62-291484 is known as a miniature pump which uses a diaphragm and has a configuration schematically shown in FIG.
1
.
This conventional miniature pump uses a disk like driving plate
5
fitted over a driving shaft
4
which is fitted into a crank stand
3
fixed to an output shaft
2
of a motor
1
as shown in FIG.
1
. Disposed around an outer circumferential portion of this disk like driving plate is a singularity or a plurality of cup diaphragm members
6
which have upward openings. In case of a pump in which the plurality of diaphragm members
6
are disposed, the diaphragm members are arranged at equal intervals on a circumference. Furthermore, a reference numeral
7
represents a cylindrical valve, a reference numeral
8
designates another valve, a reference numeral
9
denotes a suction port and a reference numeral
10
represents a discharge port.
The a miniature pump drives the motor
1
to rotate its output shaft
2
, which rotates the crank stand
3
and causes a dish-turning-gyrating movement of the driving plate
5
by way of the driving shaft
4
, thereby moving up and down driving portions
6
a
at roots of the diagram members
6
. Accordingly, the root portion (driving portion)
6
a
of the cup like diaphragm member
6
which is located to a left side, for example, in
FIG. 1
moves to go up from a lowered condition and the root portion (driving portion)
6
a
of the diaphragm member
6
which is located on a right side moves to go down from a raised condition.
By the up-down movements of the root portions of the diaphragm members
6
, the diaphragm members allow a fluid to be sucked and discharged at intervals of a definite time, thereby performing a pump function.
In order to ideally reciprocate the diaphragm members
6
, the above described conventional miniature pump must be configured so as to align a center G of the diaphragms
6
of the driving plate
5
with a fixed center of the output shaft. That is, the center G must be located on a prolonged line of the output shaft
2
. For this reason, the driving shaft requires a bearing and the driving plate
5
is prolonged, thereby enlarging the pump as a whole.
Furthermore, since the driving portion of the diaphragm member performs a reciprocal movement per rotation of the output shaft
2
, the diaphragm member
6
is abnormally deformed and a service life of the diaphragm member is extremely shortened when a rotational frequency of the motor is enhanced, that is, when the output shaft is rotated at a higher speed. A motor which is large and has strong power is therefore required.
Another conventional miniature pump is a centrifugal pump (impeller pump). This conventional centrifugal pump has a configuration, for example, shown in FIG.
2
. In
FIG. 2
, a reference numeral
21
represents a pump chamber side case, a reference numeral
22
designates a driving side case, a reference numeral
23
denotes a partition wall for partitioning a pump chamber
24
from a driving section
25
, a reference numeral
26
represents an O ring, a reference numeral
27
designates an output shaft of a motor
28
, a reference numeral
29
denotes a driving side yoke plate, a reference numeral
30
represents a driving side magnet fixed to the yoke plate
29
, a reference numeral
31
designates a spherical bearing, a reference numeral
32
denotes a holding section for a pump chamber side magnet and the like, a reference numeral
33
represents a pump chamber side magnet, a reference numeral
33
a
designates a pump chamber side yoke plate, a reference numeral
34
denotes a cover body, a reference numeral
35
represents an impeller, a reference numeral
39
designates a fluid inlet port and a reference numeral
40
denotes a fluid outlet port.
This centrifugal pump (impeller pump) drives the motor
28
to rotate the output shaft
27
, which rotates the driving side magnet
30
so that the pump chamber side magnet
33
is rotated by magnetic coupling and the impeller
35
is rotated together with the pump chamber side magnet, thereby performing a pump function.
This conventional pump is used as a pump for supplying a liquid, but has defects that the pump cannot enhance a pressure or must be configured large for obtaining a high pressure and that the pump has a low efficiency. Furthermore, the pump has defects that it has a weak force to such a liquid, whereby the pump requires priming water or must be installed lower than a level of a liquid to be sucked at a start time.
Furthermore, a pump which has a configuration shown in
FIG. 3
is known as a conventional example of diaphragm pump out of miniature pumps.
In
FIG. 3
, a reference numeral
41
represents a motor, a reference numeral
42
designates a speed reduction mechanism which consists of a gear
43
attached to an output shaft
41
a
of the motor
41
and a gear
44
in mesh with the gear
43
, a reference numeral
45
denotes a driving shaft which is fitted and fixed into and to the gear
44
so as to be eccentric from a shaft
44
a
of the gear
44
, a reference numeral
46
represents a connecting rod which is rotatably coupled with the driving shaft
45
, and a reference numeral
47
a diaphragm which is fixed to a tip of the connecting rod
46
and made of synthetic rubber or the like. This diaphragm
47
has a sealing member
47
a
which is disposed on its outer circumferential portion and is sandwiched between a clamp plate
48
and a casing
49
, thereby sealing a pump chamber
50
from external air. Furthermore, a reference numeral
51
represents a suction port, a reference numeral
52
designates a discharge port, and check valves
53
and
54
such as leaf valves are disposed in the suction port
51
and the discharge port
52
respectively.
When the motor
41
is driven to rotate the output shaft
41
a
of the motor
41
in the diaphragm pump which has the above described configuration, the gear
44
of the speed reduction mechanism
42
is rotated and the driving shaft
45
moves the diaphragm
47
up and down by way of the connecting rod
46
, whereby a volume of the pump chamber
50
is increased and decreased by the up and down movements of the diaphragm
47
. The leaf valve
53
is opened and a fluid is sucked through the suction port
51
when the volume of the pump chamber
50
is increased, and the leaf valve
54
is opened and the fluid is discharged through the discharge port
52
when the volume of the pump chamber
50
is decreased, whereby the diaphragm pump performs a pump function.
Since the pump shown in
FIG. 3
requires a speed reduction mechanism and a crank mechanism, the pump is complicated in a structure of a driving section for performing the pump function and is large. Furthermore, the pump produces remarkable noise during operation.
Furthermore, there is known a pump which is invented by the inventor of this invention and disclosed by Japanese Patent Kokai Publication No. Hei 11-230046. This miniature pump has a configuration shown in FIG.
4
.
In
FIG. 4
, a reference numeral
71
represents a motor, a reference numeral
72
designates an output shaft of the motor
71
, a reference numeral
73
denotes a disk like rotating plate which is fixed to the output shaft
72
and has a groove
73
a
having an arc like sectional shape and formed along a circumference around the output shaft
72
as a center. A reference numeral
75
represents a driving plate substantially like a disk, for example, and has, like the rotating plate
73
, a groove
75
a
which has an arc like sectional shape and formed along a circumference around a center of the driving plate
75
. A ball
74
is disposed between the groove
73
a
of the rotating plate
73
and the groove
75
a
of the driving plate
75
which are formed in opposition to each other. A reference numeral
76
represents a cylinder, a reference numeral
Belena John F
Freay Charles G.
Okenseiko Co., Ltd.
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