Hermetic compressor

Details Hermetic compressor Hermetic compressor

1999-02-12

2001-05-15

Walberg, Teresa (Department: 3742)

Pumps

Expansible chamber type

Moving cylinder

C417S437000, C418S054000

Reexamination Certificate

active

06231319

ABSTRACT:

TECHNICAL FIELD
The present invention relates to a hermetic compressor used in a refrigeration cycle system.
BACKGROUND ART
There is a conventionally proposed principle of a compressing mechanism which includes a rotary cylinder having a groove, and a piston slidable within the groove, so that the rotary cylinder is rotated in accordance with the movement of the piston to perform suction and compression strokes (for example, see German Patent No. 863,751 and British Patent No. 430,830).
The conventionally proposed principle of the compressing mechanism will be described below with reference to FIG.
26
.
The compressing mechanism is comprised of a rotary cylinder
101
having a groove
100
, and a piston
102
which is slidable within the groove
100
. The rotary cylinder
101
is provided for rotation about a point A, and the piston
102
is rotated about a point B.
The movements of the piston and the cylinder will be described as for a case where the rotational radius of the piston
102
is equal to the distance between the center A of rotation of the rotary cylinder
101
and the center B of rotation of the piston
102
.
When the rotational radius of the piston
102
is larger, or smaller than the distance between the rotational center A of the rotatable cylinder
101
and the rotational center B of the piston
102
, different movements are performed. The description of these different movements is omitted herein.
A broken line C in
FIG. 26
indicate a locus for the piston
102
.
FIGS. 26
a
to
26
i
show states in which the piston
102
has been rotated through every 90 degree.
First, the movement of the piston
102
will be described below.
FIG. 26
a
shows the state in which the piston lies immediately above the rotational center B.
FIG. 26
b
shows the state in which the piston
102
has been rotated through 90 degree in a counterclockwise direction from the state shown in
FIG. 26
a
.
FIG. 26
c
shows the state in which the piston
102
has been rotated through 180 degree in the counterclockwise direction from the state shown in
FIG. 26
a
.
FIG. 26
d
shows the state in which the piston
102
has been further rotated through 270 degree in the counterclockwise direction from the state shown in
FIG. 26
a
.
FIG. 26
e
shows the state in which the piston
102
has been rotated through 360 degree in the counterclockwise direction from the state shown in
FIG. 26
a
and has been returned to the state shown in
FIG. 26
a.
The movement of the rotary cylinder
102
will be described below. In the state shown in
FIG. 26
a
, the rotary cylinder
101
is located, so that the groove
100
is located vertically. When the piston
102
is moved through 90 degree in the counterclockwise direction from this state, the rotary cylinder
101
is rotated through 45 degree in the counter-clockwise direction, as shown in
FIG. 26
b
and hence, the groove
100
is likewise brought into a state in which it is inclined at 45 degree When the piston
102
is rotated through 180 degree in the counterclockwise direction from the state shown in
FIG. 26
a
, the rotary cylinder
101
is rotated through 90 degree in the counterclockwise direction, as shown in
FIG. 26
c
and hence, the groove
100
is likewise brought into a state in which it is inclined at 90 degree.
In this way, the rotary cylinder
101
is rotated in the same direction with the rotation of the piston
102
, but while the piston
102
is rotated through 360 degree, the rotary cylinder
101
is rotated through 180 degree.
The change in volume of the groove
100
defining the compressing space will be described below.
In the state shown in
FIG. 26
a
, the piston
102
lies at one end in the groove
100
and hence, only one space
100
exists. This space
100
is called a first space
100
a
herein. In the state shown in
FIG. 26
b
, the first space
100
a
is narrower, but a second space
100
b
is produced on the opposite side of the piston
102
. In the state shown in
FIG. 26
c
, the first space
100
a
is as small as half of the space in the state shown in
FIG. 26
a
, but a second space
100
b
of the same size as the first space
100
a
is defined on the opposite side of the piston
102
. The first space
100
a
is zero in volume in the state shown in
FIG. 26
e
in which the piston
102
has been rotated through 360 degree.
In this way, the two spaces
100
a
and
100
b
are defined by the piston
102
and repeatedly varied in volume from the minimum to the maximum and from the maximum to the minimum, whenever the piston
102
is rotated through 360 degree.
Therefore, the spaces defining the compressing chambers perform the compression and suction strokes by the rotation of the piston
102
through 720 degree.
It is a main object of the present invention to utilize the above-described compressing principle in the hermetic compressor.
The above-described compressing principle suffers from the following problem: When the piston
102
is at the center A of rotation of the rotary cylinder
101
, the direction of a force provided by the rotational force of the piston
102
is the same as the direction of the groove
100
and hence, this force does not serve a force for rotating the rotary cylinder
101
. Therefore, when the piston
102
is at the center A of rotation of the rotary cylinder
101
, the above-described movement is actually continuously not performed, if the rotational force is not applied to the rotary cylinder
101
.
A continuous movement is realized by using a plurality of compressing mechanisms synchronized with each other with different phases. More specifically, by using a plurality of compressing mechanisms synchronized with each other with different phases, the rotational force of one of the rotatable cylinders can be applied to the other rotatable cylinder. Therefore, even if either one of the rotatable cylinders is brought into a state in which it does not receive the rotational force from the piston, the other rotatable cylinder applies the rotational force to the one rotatable cylinder and hence, the rotation can be continuously maintained.
However, when the plurality of compressing mechanisms with different phases are used, the compressing strokes in the compressing chambers in the compressing mechanisms are different from each other. For this reason, a partition plate for isolating the adjacent compressing mechanisms is required. To ensure a smooth rotation, the synchronization of the plurality of compressing mechanisms must be made reliable.
Accordingly, it is an object of the present invention to provide a hermetic compressor using a plurality of compressing mechanisms with different phases, wherein the synchronization of the plurality of compressing mechanisms can be made reliable.
It is another object of the present invention to provide a hermetic compressor, wherein the reliable synchronization of the compressing mechanisms can be realized by a particular structure capable of being industrially produced.
It is a further object of the present invention to provide a hermetic compressor, wherein a high suction efficiency can be realized.
It is a yet further object of the present invention to provide a hermetic compressor, wherein a high compressing efficiency can be realized.
Further, it is an object of the present invention to provide a hermetic compressor, wherein a non-circular piston is employed, and the area of contact between a rotary cylinder and the piston is increased to enhance the sealability and to enhance the sucking and compressing efficiencies.
SUMMARY OF THE INVENTION
To achieve the above objects, according to a first aspect and feature of the present invention, there is provided a hermetic compressor comprising a plurality of compressing mechanisms each of which includes a rotary cylinder having a groove, and a piston which is slidable in the groove, so that a compressing stroke is carried out by rotation of the piston on a locus of a radius E about a point spaced apart at a distance E from the center of the rotary cylinder; a partition plate being interposed between the rota

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