Rotary expansible chamber devices – Working member has planetary or planetating movement – Helical working member – e.g. – scroll
Reexamination Certificate
1998-09-17
2001-11-27
Denion, Thomas (Department: 3748)
Rotary expansible chamber devices
Working member has planetary or planetating movement
Helical working member, e.g., scroll
C418S015000, C418S055100, C418S055600, C418S094000, C418S100000
Reexamination Certificate
active
06322339
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a scroll compressor mounted on an air conditioner, a refrigerating machine, etc. and, more particularly, to a scroll compressor adapted to discharge compressed gas, which has been compressed in a plurality of compression chambers formed by the engagement between a stationary scroll and a swivel scroll, out of a hermetic housing.
2. Description of Related Art
A scroll compressor
1
A employed for a refrigerating cycle of an air conditioner has a composition, for example, shown in
FIG. 6. A
cylindrical hermetic housing
1
with its both ends closed includes an electric element
2
and a scroll compression element
3
. The electric element
2
is composed of a stator
4
secured to the inner wall surface of the hermetic housing
1
and a rotor
5
rotatably supported in the stator
4
, a rotating shaft
6
being connected to the rotor
5
in a penetrating fashion. One end of the rotating shaft
6
is rotatably supported on a support frame
7
partly constituting the scroll compression element
3
. The other end of the rotating shaft
6
juts out of the rotor
5
, a lubricating portion
8
being connected to the distal end thereof. An oil inlet pipe
9
is connected to an end of the lubricating portion
8
. The end of the intake side of the oil inlet pipe
9
is extended downward so that it is
1
. submerged in a lubricant “b” contained in the hermetic housing
An oil feed passage
10
for sucking in the lubricant “b” from the lubricating portion
8
and supplying it is bored in the rotating shaft
6
in the axial direction. The lubricant passes through the oil feed passage
10
to be supplied to sliding parts such as the support frame
7
, then it is recirculated.
The central part of one end of the rotating shaft
6
supported by the support frame
7
in the penetrating manner is formed as a pin or crank
11
provided eccentrically in relation to the axial center of the rotating shaft
6
. A swivel scroll
12
is connected to the pin
11
. The swivel scroll
12
is formed into a discoid shape. A boss hole
13
for connection with the pin
11
is formed at the center of one side surface of the swivel scroll
12
, while a spiral swivel lap
14
is integrally formed on the other side surface of the swivel scroll
12
.
Joined to the support frame
7
is a stationary scroll
15
. The stationary scroll
15
has a spiral stationary lap
16
formed on a portion thereof opposed to the swivel scroll
12
, and also a plurality of compression chambers
17
formed between itself and the swivel lap
14
.
A refrigerant gas introduced into the outer peripheral portion of the scroll compression element
3
via an intake pipe
18
from outside the hermetic housing
1
is taken in through two inlets of the scroll compression element
3
, namely, a first suction inlet (not shown) and a second suction inlet (not shown) that is located oppositely with respect to the first suction inlet and that is in communication therewith through a communication groove connected to the first suction inlet. Then, the refrigerant gas is compressed in the compression chambers
17
and the volume thereof is gradually reduced as it moves toward the center before it is discharged into the hermetic housing
1
through a discharge port provided at the center of one side surface of the stationary scroll
15
, thus separating the lubricant accompanied the refrigerant gas in this space so as to reduce pulsation.
The compressed gas discharged through the discharge port
19
into the hermetic housing
1
flows through passages (not shown) provided in the stationary scroll
15
and the support frame
7
as indicated by the white arrows and reaches the side of electric element
2
. And the lubricant in the refrigerant gas is further separated primarily by the centrifugal force generated by the rotation of the rotor
5
. The refrigerant gas from which the lubricant has been separated is discharged out of the hermetic housing
1
through a discharge pipe
20
. The separated lubricant flows as indicated by the black arrows and accumulates at the bottom of the hermetic housing
1
and it is recirculated.
However, there has been a problem in that, if the amount of the refrigerant taken in through a first suction inlet (not shown) of the scroll compression element
3
is different from that taken in through the second suction inlet (not shown) thereof, then the intake efficiency deteriorates, resulting in more pulsation with consequent noise and deteriorated reliability.
SUMMARY OF THE INVENTION
Accordingly, it is an object of the present invention to provide a highly reliable scroll compressor adapted to make the amount of a refrigerant taken in through the first suction inlet of the scroll compression element
3
mentioned above as equal as possible to that taken in through the second suction inlet thereby to improve the intake efficiency so as to control pulsation or noise.
The inventors have zealously studied the aforesaid problem and found the following solution thereto, leading to the fulfillment of the present invention. To be more specific, if the sectional area of the inlet portion of a particular refrigerant passage is denoted by A1, the sectional area of the inlet portion of the first suction inlet is denotes by A2, and the sectional area of the inlet portion of a communication groove is denoted by A3 when the gap between the stationary lap and the swivel lap reaches the maximum thereof, then the problem can be solved by controlling these values to the range specified by a formula (1) given below, and/or by providing a throttle portion extending from an inlet of the communication groove to a particular position and by setting a sectional area a3 of the communication groove from the throttle portion to a second suction inlet to a value smaller than the sectional area A3.
A scroll compressor according to claim
1
of the present invention has an electric element and a scroll compression element driven by the electric element that are placed in a hermetic housing wherein the scroll compression element includes a stationary scroll having a spiral stationary lap and a swivel scroll having a spiral swivel lap that revolves with respect to the stationary scroll by being driven by the electric element, the stationary scroll and the swivel scroll are meshed with each other to form a plurality of compression chambers, a refrigerant gas, which has been introduced from outside the hermetic housing into a refrigerant introducing portion of the outer peripheral portion of the scroll compression element, is taken in through a first suction inlet and a second suction inlet that is located in a position relative to the first suction inlet and in communication therewith through a communication groove connected with the first suction inlet, and compressed in the compression chambers before it is discharged out of the hermetic housing; and wherein, if the sectional area of the inlet of a refrigerant passage through which a refrigerant taken in flows from an end of the swivel lap via the outer periphery thereof to the second suction inlet is denoted as A1, the sectional area of the inlet of the first suction inlet is denoted as A2, and the sectional area of the inlet of the communication groove is denoted as A3when the gap between the stationary lap and the swivel lap reaches the maximum thereof, then A1, A2, and A3 stay within a range defined by a formula (1) given below:
1.5≦A2/(A1+A3)≦2.5 Formula (1)
A scroll compressor according to claim
2
of the present invention has an electric element and a scroll compression element driven by the electric element that are placed in a hermetic housing, wherein the scroll compression element includes a stationary scroll having a spiral stationary lap and a spiral swivel lap that revolves with respect to the stationary scroll by being driven by the electric element, the stationary scroll and the spiral swivel lap are meshed with each other to form a plurality of compression chambers, a refrigerant
Fujiwara Kazuaki
Matsumoto Kenzo
Mitsunaga Toshihiko
Nishikawa Takahiro
Sato Kazuya
Darby & Darby
Denion Thomas
Sanyo Electric Co,. Ltd.
Trieu Theresa
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