Pumps – Expansible chamber type – Having pumping chamber pressure responsive distributor
Reexamination Certificate
2000-06-01
2002-01-08
Walberg, Teresa (Department: 3742)
Pumps
Expansible chamber type
Having pumping chamber pressure responsive distributor
C417S559000, C137S855000, C137S856000
Reexamination Certificate
active
06336795
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a piston-type compressor with a suction reed valve stopper adapted for use in a unit for air-conditioning vehicle compartments. In particular, the invention relates to a piston-type compressor with a suction reed valve stopper, which retains the movement of the suction reed valve during each suction stroke of the corresponding piston while permitting an adequate amount of opening for refrigerant suction and suppressing noisy vibration of the suction reed valves.
2. Description of Related Art
Referring to
FIG. 3
, a refrigerant compressor is shown in accordance with U.S. Pat. No. 4,664,604, which is incorporated herein by reference in its entirety. The compressor includes a closed, cylinder casing assembly
1
bracketed by a front housing
3
and a cylinder head
26
and provided with a cylinder block
2
at a cylinder head side and a hollow portion, such as crank chamber
1
a.
Front housing
3
is mounted on the left-side opening of casing assembly
1
to close the end opening of crank chamber
1
a
and fixed on casing assembly
1
by a plurality bolts (not shown). Cylinder head
26
and a valve plate
24
are mounted on the other end of casing assembly
1
by a plurality of bolts (not shown) to cover the end portion of cylinder block
2
.
An opening
3
a
is formed in front housing
3
to receive a drive shaft
4
via a radial bearing
5
and mechanical seal
7
. An annular sleeve
3
b
projects from the front end surface of front housing
3
and surrounds drive shaft
4
to define a shaft seal cavity
6
. Mechanical seal
7
is positioned on drive shaft
4
within shaft seal cavity
6
. Drive shaft
4
is supported rotatably by front housing
3
through radial bearing
5
which is disposed within opening
3
a.
Within front housing
3
, drive shaft
4
is provided with a rotor
8
. A thrust needle bearing
14
is positioned between the inner end surface of front housing
3
and the adjacent axial end surface of rotor
8
via a thrust race
13
to receive the thrust load that acts against rotor
8
and to ensure smooth motion. Drive shaft
4
, which extends to sleeve
9
that is urged toward cylinder block
2
by a coil spring
12
, is supported rotationally by a radial bearing
15
, and supported by an adjusting screw
18
, which is screwed into a threaded portion of a cylinder block
2
via a thrust needle bearing
16
and spring devices
17
.
Thrust needle bearing
16
is placed between drive shaft
4
and spring devices
17
to ensure smooth rotation of drive shaft
4
. Sleeve
9
, which is placed between rotor
8
and the inner end of cylinder block
2
, is carried slidably on drive shaft
4
. Sleeve
9
supports a swash plate
10
for both nutational (i.e., wobbling) and rotation motion. Coil spring
12
surrounds drive shaft
4
, and is positioned between the end surface of rotor
8
and one axial end surface of sleeve
9
to urge sleeve
9
toward cylinder block
2
. Swash plate
10
is connected with rotor
8
through a hinge coupling mechanism for rotation in unison with rotor
8
. Thus, rotor
8
has an arm portion
8
a
projecting axially outwardly from one side surface thereof, and swash plate
10
also has second arm portion
10
a
projecting toward arm portion
8
a
of rotor
8
from one side surface thereof.
In the compressor, as shown in
FIG. 3
, second arm portion
10
a
is formed separately from swash plate
10
and fixed on one side surface of swash plate
10
. Arm portions
8
a
and
10
a
overlap each other and are connected to one another by a pin
11
, which is provided on arm portion
8
a
and extends into a rectangular-shaped hole
10
b
formed through the second arm portion
10
a
of swash plate
10
. In this manner, rotor
8
and swash plate
10
are hinged to one another. By this construction, pin
11
is disposed slidably in rectangular hole
10
b
and changes the slant angle of the inclined surface of swash plate
10
. Cylinder block
2
has a plurality of annularly arranged cylinders
2
a
within which pistons
20
slide.
A known arrangement of such a compressor includes five cylinders, but fewer or more cylinders may be provided. Each piston
20
comprises a head portion
21
disposed slidably within cylinder
2
a.
Semispherical shoes
19
are disposed between each slide surface of swash plate
10
and face inner surface of pistons
20
for sliding along the side surface of swash plate
10
. The rotation of drive shaft
4
causes swash plate
10
to rotate between shoes
19
and to move the inclined surface axially to the right and left, thereby reciprocating pistons
20
within cylinders
2
a.
Cylinder head
26
is configured to define a suction chamber
27
and discharge chamber
28
. Valve plate member
24
, together with cylinder head
26
, is fastened to the end of cylinder block
2
by a plurality of screws (not shown), and is provided with a plurality of valved suction ports
22
connected between suction chamber
27
and respective cylinders
2
a,
and a plurality of valved discharge ports
23
connected between discharge chamber
28
and respective cylinders
2
a.
Gaskets
25
and
29
are positioned between cylinder block
2
and valve plate
24
, and between valve plate
24
and cylinder head
26
, respectively, to seal the mating surfaces of cylinder block
2
, valve plate
24
, and cylinder head
26
.
Crank chamber
1
a
and suction chamber
27
are connected by a passageway
30
, which comprises an aperture
30
a
formed through valve plate
24
and gaskets
25
and
29
and bore
30
b
formed in cylinder block
2
. A coupling element
31
with a small aperture
31
a
is disposed in the one end opening of bore
30
b,
which faces crank chamber
1
a,
and a bellows element
34
containing gas and having a needle valve
34
a
is disposed in bore
30
b.
The opening and closing of small aperture
3
a,
which is connected between crank chamber
1
a
and bore
30
b,
is controlled by needle valve
34
a,
and the axial position of bellows element
34
is determined by frame element
33
disposed in bore
30
b.
At least one hole
33
a
is formed through frame
33
to communicate between aperture
30
a
and bore
30
b.
In operation, drive shaft
4
is rotated by the engine of a vehicle through a pully arrangement (not shown), and rotor
8
is rotated together with drive shaft
4
. The rotation of rotor
8
is transferred to swash plate
10
through the hinge coupling mechanism, so that, with respect to the rotation of rotor
8
, the inclined surface of swash plate
10
moves axially to the right and left. Pistons
20
, which are operatively connected to swash plate
10
by means of shoes
19
, reciprocate within cylinders
2
a.
As pistons
20
reciprocate, the refrigerant gas, which is introduced into suction chamber
27
from the fluid inlet port
27
a,
is taken into each cylinder
2
a
and compressed. The compressed refrigerant gas is discharged to discharge chamber
28
from each cylinder
2
a
through a discharge port
23
and therefrom into an external fluid circuit, for example, a cooling circuit through the fluid outlet port
28
a.
According to FIG.
4
and
FIG. 5
, suction reed valves
36
′, which are made of a resilient metallic material, such as a thin stainless steel plate, are formed to be resiliently movable between a closed position, in which they are in contact with valve plates
24
for closing suction ports
22
, and an open position, in which suction reed valves
36
′ are separated from valve plates
24
in order to allow suction ports
22
to open.
When suction reed valves
36
′ are moved to the open position, the end of each suction reed valve
36
′ abuts against a stop formed at a bottom of a recess
2
b
′ in the axial end face of the cylinder block
2
. Thus, the amount of movement of suction reed valve
36
′ is determined by the depth of the bottom of recess
2
b
′ as measured from the axial end face of cylinder block
2
.
Thus, according to known construction methods, the su
Campbell Thor
Sanden Corporation
Walberg Teresa
LandOfFree
Fluid displacement apparatus with suction reed valve stopper does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Fluid displacement apparatus with suction reed valve stopper, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Fluid displacement apparatus with suction reed valve stopper will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2840621