[TECHNICAL FIELD]
[0001] The present invention relates to a scroll compressor used in a cooling device of
an air conditioner or a refrigerator, and a freezing device of a heat pump type hot
water supply system.
[BACKGROUND TECHNIQUE]
[0002] A scroll compressor is used in a freezing device and an air conditioner. In the scroll
compressor, gas refrigerant which evaporated in an evaporator is sucked, the gas refrigerant
is compressed to pressure required to condense the gas refrigerant by a condenser,
and high temperature and high pressure gas refrigerant is sent into a refrigerant
circuit.
[0003] According to a scroll compressor described in patent document 1, an Oldham mechanism
includes a ring portion, a fixed-side key portion which projects from one of surfaces
of the ring portion and which is slidably engaged, in a reciprocating manner, with
an Oldham guide groove which is formed in a swinging scroll, and a swinging-side key
portion which projects from one of the surfaces of the ring portion and which is slidably
engaged, in a reciprocating manner, with the Oldham guide groove which is formed in
a swinging scroll. The fixed-side key portion is shifted toward a radially outer side
from the ring portion. An escape which avoids interference with the fixed-side key
portion is provided on an inner peripheral surface of a guide frame at a position
opposed to the fixed-side key portion.
[PRIOR ART DOCUMENT]
[PATENT DOCUMENT]
[SUMMARY OF THE INVENTION]
[PROBLEM TO BE SOLVED BY THE INVENTION]
[0005] However, a large scroll compressor has a problem that rigidity of a key peripheral
portion in a rotation restraint member is insufficient.
[0006] Hence, it is an object of the present invention to provide a scroll compressor having
high rigidity of the key peripheral portion in the rotation restraint member.
[MEANS FOR SOLVING THE PROBLEM]
[0007] A scroll compressor of the present invention described in claim 1 including a hermetical
container 1, in which the hermetical container 1 is provided therein with a compressing
mechanism portion 10 for compressing refrigerant and an electric mechanical portion
20 for driving the compressing mechanism portion 10, the compressing mechanism portion
10 includes a fixed scroll 11, an orbiting scroll 12 and a rotation shaft 13 for turning
and driving the orbiting scroll 12, the fixed scroll 11 includes a disk-shaped fixed
scroll end plate 11a, and a fixed scroll lap 11b standing on the fixed scroll end
plate 11a, the orbiting scroll 12 includes a disk-shaped turning scroll end plate
12a, an orbiting scroll lap 12b standing on a lap-side end surface of the orbiting
scroll end plate 12a, and a boss portion 12c formed on a side opposite from the lap-side
end surface of the orbiting scroll end plate 12a, an eccentric shaft 13a which is
inserted into the boss portion 12c is formed on an upper end of the rotation shaft
13, the fixed scroll lap 11b and the orbiting scroll lap 12b are meshed with each
other, a plurality of compression chambers 15 are formed between the fixed scroll
lap 11b and the orbiting scroll lap 12b, a main bearing 30 for supporting the fixed
scroll 11 and the orbiting scroll 12 is provided below the fixed scroll 11 and the
orbiting scroll 12, a rotation restraint member 17 for restraining the orbiting scroll
12 from rotating is provided between the fixed scroll 11 and the main bearing 30,
a bearing portion 31 for pivotally supporting the rotation shaft 13, a boss-accommodating
portion 32 for accommodating the boss portion 12c therein, and a rotation restraint
member ring recess 34 where the rotation restraint member 17 is placed are formed
on the main bearing 30, the rotation restraint member 17 includes an annular ring
portion 17a, a pair of fixed-side keys 17b which are slidably engaged with a pair
of fixed-side guide grooves 11d formed in the fixed scroll 11, and a pair of turning-side
keys 17c which are slidably engaged with a pair of turning-side guide grooves 12d
formed in the orbiting scroll 12, the boss-accommodating portion 32 is a high pressure
region A, an outer circumferential portion of the orbiting scroll 12 where the rotation
restraint member 17 is placed is an intermediate pressure region B, and the orbiting
scroll 12 is pushed against the fixed scroll 11 by pressures of the high pressure
region A and the intermediate pressure region B, wherein the pair of fixed-side keys
17b are formed on one of ring surfaces of the ring portion 17a through a pedestal
17d, the pair of turning-side keys 17c are formed on the one of the ring surfaces
of the ring portion 17a, a circumferential width dw of the pedestal 17d is larger
than a circumferential width bw of the fixed-side key 17b, a radial width cr of the
turning-side key 17c is larger than a radial width ar of the ring portion 17a, and
a radial inner end surface 17ci of the turning-side key 17c projects more than an
inner circumferential surface 17ai of the ring portion 17a.
[0008] The scroll compressor of the invention described in claim 2 according to claim 1,
wherein a radial outer end surface 17do of the pedestal 17d is located on a same plane
as an outer circumferential surface 17ao of the ring portion 17a, and a radial outer
end surface 17bo of the fixed-side key 17b projects more than the outer circumferential
surface 17ao of the ring portion 17a.
[0009] The scroll compressor of the invention described in claim 3 according to claim 1,
wherein a radial outer end surface 17do of the pedestal 17d and a radial outer end
surface 17bo of the fixed-side key 17b are on a same plane as an outer circumferential
surface 17ao of the ring portion 17a, a pair of escaping portions 34x are formed on
an outer circumferential surface 34o of the rotation restraint member ring recess
34, and the pair of escaping portions 34x are located at positions corresponding to
the fixed-side keys 17b.
[EFFECT OF THE INVENTION]
[0010] According to the present invention, it is possible to enhance rigidity of fixed-side
keys and turning-side keys in a rotation restraint member.
[BRIEF DESCRIPTION OF THE DRAWINGS]
[0011]
Fig. 1 is a vertical sectional view of a scroll compressor according to an embodiment
of the present invention;
Fig. 2 is an enlarged sectional view of an essential portion of a compressing mechanism
portion in Fig. 1;
Figs. 3 are plan views of a fixed scroll and an orbiting scroll shown in Figs. 1 and
2;
Figs. 4 are diagrams showing a rotation restraint member of the embodiment;
Figs. 5 are diagrams showing a main bearing and the rotation restraint member of the
embodiment;
Figs. 6 are diagrams showing a rotation restraint member of another embodiment;
Figs. 7 are diagrams showing a main bearing and the rotation restraint member of the
embodiment.
[MODE FOR CARRYING OUT THE INVENTION]
[0012] According to a scroll compressor of a first embodiment of the present invention,
a rotation restraint member includes an annular ring portion, a pair of fixed-side
keys which are slidably engaged with a pair of fixed-side guide grooves formed in
a fixed scroll, and a pair of turning-side keys which are slidably engaged with a
pair of turning-side guide grooves formed in an orbiting scroll. The pair of fixed-side
keys are formed on one of ring surfaces of the ring portion through a pedestal, the
pair of turning-side keys are formed on one of the ring surfaces of the ring portion,
a circumferential width of the pedestal is made larger than a circumferential width
of the fixed-side key, a radial width of the turning-side key is made larger than
a radial width of the ring portion, and a radial inner end surface of the turning-side
key projects more than an inner circumferential surface of the ring portion. According
to the embodiment, it is possible to enhance rigidity of the fixed-side keys and the
turning-side keys.
[0013] According to a second embodiment of the invention, in the scroll compressor of the
first embodiment, a radial outer end surface of the pedestal is located on a same
plane as an outer circumferential surface of the ring portion, and a radial outer
end surface of the fixed-side key projects more than the outer circumferential surface
of the ring portion. According to the second embodiment, it is possible to further
enhance the rigidity of the fixed-side keys.
[0014] According to a third embodiment of the invention, in the scroll compressor of the
first embodiment, the radial outer end surface of the pedestal and the radial outer
end surface of the fixed-side key are located on a same plane as the outer circumferential
surface of the ring portion, a pair of escaping portions are formed on an outer circumferential
surface of a ring-shaped rotation restraint member ring recess, and the pair of escaping
portions are located at positions corresponding to the fixed-side keys. According
to the third embodiment, it is possible to further enhance the rigidity of the fixed-side
keys.
[Embodiments]
[0015] A scroll compressor according to an embodiment of the present invention will be described
below. The invention is not limited to the following embodiments.
[0016] Fig. 1 is a vertical sectional view of the scroll compressor according to the embodiment.
[0017] A compressing mechanism portion 10 for compressing refrigerant and an electric mechanical
portion 20 for driving the compressing mechanism portion 10 are placed in a hermetical
container 1.
[0018] The hermetical container 1 is composed of a cylindrically formed body portion 1a
extending along a vertical direction, an upper lid 1c for closing an upper opening
of the body portion 1a, and a lower lid 1b for closing a lower opening of the body
portion 1a.
[0019] The hermetical container 1 includes a refrigerant sucking pipe 2 for introducing
refrigerant into the compressing mechanism portion 10, and a refrigerant discharging
pipe 3 for discharging refrigerant compressed by the compressing mechanism portion
10 to outside of the hermetical container 1.
[0020] The compressing mechanism portion 10 includes a fixed scroll 11, an orbiting scroll
12, and a rotation shaft 13 for turning and driving the orbiting scroll 12.
[0021] The electric mechanical portion 20 includes a stator 21 fixed to the hermetical container
1, and a rotor 22 placed on the inner side of the stator 21. The rotation shaft 13
is fixed to the rotor 22. An eccentric shaft 13a which is eccentric with respect to
the rotation shaft 13 is formed on an upper end of the rotation shaft 13.
[0022] A main bearing 30 for supporting the fixed scroll 11 and the orbiting scroll 12 is
provided below the fixed scroll 11 and the orbiting scroll 12.
[0023] A bearing portion 31 for pivotally supporting the rotation shaft 13, a boss-accommodating
portion 32, a seal ring recess 33, and a rotation restraint member ring recess 34
are formed on the main bearing 30. The main bearing 30 is fixed to the hermetical
container 1 by welding or shrinkage fitting.
[0024] The fixed scroll 11 includes a disk-shaped fixed scroll end plate 11a, a fixed scroll
lap 11b standing on the fixed scroll end plate 11a, and an outer circumferential wall
11c standing and surrounding a circumference of the fixed scroll lap 11b. A discharging
port 14 is formed in a substantially center portion of the fixed scroll end plate
11a.
[0025] The orbiting scroll 12 includes a disk-shaped turning scroll end plate 12a, an orbiting
scroll lap 12b standing on a lap-side end surface of the orbiting scroll end plate
12a, and a cylindrical boss portion 12c formed on a side opposite from the lap-side
end surface of the orbiting scroll end plate 12a.
[0026] The fixed scroll lap 11b of the fixed scroll 11 and the orbiting scroll lap 12b of
the orbiting scroll 12 are meshed with each other. A plurality of compression chambers
15 are formed between the fixed scroll lap 11b and the orbiting scroll lap 12b.
[0027] The boss portion 12c is formed on a substantially central portion of the orbiting
scroll end plate 12a. The eccentric shaft 13a is inserted into the boss portion 12c,
and the boss portion 12c is accommodated in the boss-accommodating portion 32.
[0028] The fixed scroll 11 is fixed to the main bearing 30 by the outer circumferential
wall 11c using a plurality of bolts 16. The orbiting scroll 12 is supported by the
fixed scroll 11 through a rotation restraint member 17 such as an Oldham ring. The
rotation restraint member 17 which restrains rotation of the orbiting scroll 12 is
placed in the rotation restraint member ring recess 34, and is provided between the
fixed scroll 11 and the main bearing 30. According to this, the orbiting scroll 12
turns with respect to the fixed scroll 11 without rotating.
[0029] A lower end 13b of the rotation shaft 13 is pivotally supported by an auxiliary bearing
18 which is placed on a lower portion of the hermetical container 1.
[0030] An oil reservoir 4 for storing lubricant oil therein is formed in a bottom of the
hermetical container 1.
[0031] A lower end of the rotation shaft 13 is provided with a displacement oil pump 5.
The oil pump 5 is placed such that its suction port exists in the oil reservoir 4.
The oil pump 5 is driven by the rotation shaft 13. Irrespective of a pressure condition
or operation speed, the oil pump 5 can reliably suck lubricant oil existing in the
oil reservoir 4 provided in the bottom of the hermetical container 1. Therefore, anxiety
of running out of oil is dissolved.
[0032] A rotation shaft oil supply hole 13c is formed in the rotation shaft 13. The rotation
shaft oil supply hole 13c extends from the lower end 13b of the rotation shaft 13
to the eccentric shaft 13a.
[0033] Lubricant oil sucked by the oil pump 5 is supplied into a bearing of the auxiliary
bearing 18, the bearing portion 31 and the boss portion 12c through the rotation shaft
oil supply hole 13c which is formed in the rotation shaft 13.
[0034] The refrigerant sucked from the refrigerant sucking pipe 2 is introduced into the
compression chambers 15 from a suction port 15a. The compression chambers 15 move
from the outer circumferential side toward the central portion while reducing volumes
thereof, and refrigerant which reaches predetermined pressure in the compression chambers
15 is discharged into a discharging chamber 6 from the discharging port 14 provided
in the central portion of the fixed scroll 11. The discharging port 14 is provided
with a discharging reed valve (not shown) The refrigerant which reaches the predetermined
pressure in the compression chambers 15 pushes and opens the discharging reed valve,
and is discharged into the discharging chamber 6. The refrigerant discharged into
the discharging chamber 6 is derived into an upper portion in the hermetical container
1, the refrigerant passes through a refrigerant passage (not shown) formed in the
compressing mechanism portion 10, reaches a circumference of the electric mechanical
portion 20, and the refrigerant is discharged out from the refrigerant discharging
pipe 3.
[0035] Fig. 2 is an enlarged sectional view of an essential portion of the compressing mechanism
portion in Fig. 1.
[0036] According to the scroll compressor of the embodiment, the boss-accommodating portion
32 is a high pressure region A, and an outer circumferential portion of the orbiting
scroll 12 where the rotation restraint member 17 is placed is an intermediate pressure
region B. The orbiting scroll 12 is pushed against the fixed scroll 11 by pressures
of the high pressure region A and the intermediate pressure region B.
[0037] The eccentric shaft 13a is turnably inserted into the boss portion 12c through the
turning bearing 13d. An oil groove 13e is formed in the outer circumferential surface
of the eccentric shaft 13a.
[0038] The seal ring recess 33 is formed in a thrust surface of the main bearing 30 which
receives thrust force of the orbiting scroll end plate 12a. The rotation restraint
member ring recess 34 is formed in an outer circumference of the thrust surface of
the main bearing 30. The seal ring recess 33 is provided with a ring-shaped seal member
33a. The seal member 33a is placed on the outer circumference of the boss-accommodating
portion 32.
[0039] The hermetical container 1 is filled with high pressure refrigerant, and the high
pressure is the same as that of refrigerant discharged into the discharging chamber
6. The rotation shaft oil supply hole 13c opens into an upper end of the eccentric
shaft 13a. Therefore, pressure in the boss portion 12c is the high pressure region
A having the same pressure as that of the discharged refrigerant.
[0040] Lubricant oil introduced into the boss portion 12c through the rotation shaft oil
supply hole 13c is supplied to the turning bearing 13d and the boss-accommodating
portion 32 by the oil groove 13e formed in the outer circumferential surface of the
eccentric shaft 13a. Since the outer circumference of the boss-accommodating portion
32 is provided with the seal member 33a, the boss-accommodating portion 32 is the
high pressure region A.
[0041] The fixed scroll end plate 11a includes an intermediate pressure taking-out hole
41 for taking out the intermediate pressure of the compression chambers 15, and an
end plate-side intermediate pressure communication passage 42a which is in communication
with the intermediate pressure taking-out hole 41.
[0042] The outer circumferential wall 11c of the fixed scroll 11 is provided with a circumferential
wall-side intermediate pressure communication passage 42b which brings the end plate-side
intermediate pressure communication passage 42a and the intermediate pressure region
B into communication with each other.
[0043] The end plate-side intermediate pressure communication passage 42a and the circumferential
wall-side intermediate pressure communication passage 42b form an intermediate pressure
communication passage 42. The intermediate pressure communication passage 42 is formed
in the fixed scroll 11. The intermediate pressure communication passage 42 brings
the intermediate pressure taking-out hole 41 and the intermediate pressure region
B into communication with each other.
[0044] As described above, the intermediate pressure communication passage 42 which brings
the intermediate pressure taking-out hole 41 and the intermediate pressure region
B into communication with each other is formed in the fixed scroll 11, and intermediate
pressure of the compression chambers 15 is introduced into the intermediate pressure
region B. According to this, especially under a low pressure compression rate condition,
it is possible to prevent the orbiting scroll 12 from separating from the fixed scroll
11, and airtightness of the compression chambers 15 can be enhanced.
[0045] The orbiting scroll end plate 12a is provided with a first oil introducing hole 51
formed in the boss portion 12c, a first oil deriving hole 52 formed in an outer circumference
of the lap-side end surface, and a first end plate oil communication passage 53 which
brings the first oil introducing hole 51 and the first oil deriving hole 52 into communication
with each other.
[0046] The orbiting scroll end plate 12a is provided with a second oil introducing hole
61 which opens into the intermediate pressure region B, a second oil deriving hole
62 which opens into a low pressure space of the compression chambers 15, and a second
end plate oil communication passage 63 which brings the second oil introducing hole
61 and the second oil deriving hole 62 into communication with each other. The second
oil introducing hole 61 is formed in a side surface of the orbiting scroll end plate
12a.
[0047] Figs. 3 are plan views of the fixed scroll and the orbiting scroll shown in Figs.
1 and 2.
[0048] Fig. 3(a) is a plane view of the fixed scroll according to the embodiment as viewed
from the fixed scroll lap, and Fig. 3(b) is a plane view of the orbiting scroll of
the embodiment as viewed from the orbiting scroll lap.
[0049] In Fig. 3(a), a gray zone represents the intermediate pressure region B. As shown
in the drawing, the intermediate pressure region B is formed around the outer circumference
of the fixed scroll lap 11b.
[0050] As shown in Fig. 3(a), the pair of fixed-side guide grooves 11d are formed in the
fixed scroll 11.
[0051] The fixed scroll 11 is provided with a fixed scroll sliding surface 11e which slides
on the orbiting scroll end plate 12a shown in Fig. 3(b). The orbiting scroll end plate
12a is located on a more outer circumference side than the orbiting scroll lap 12b.
The intermediate pressure region B is formed more on a more outer circumference side
than the fixed scroll sliding surface 11e.
[0052] The fixed scroll sliding surface 11e is provided with a sliding surface groove 54
which is in communication with the intermediate pressure region B.
[0053] As shown in Fig. 3(b), the first oil deriving hole 52 and the second oil deriving
hole 62 open into an outer circumference of the lap-side end surface of the orbiting
scroll end plate 12a, and a pair of turning-side guide grooves 12d are formed in the
orbiting scroll 12.
[0054] According to the scroll compressor of the embodiment, by forming the high pressure
region A and the intermediate pressure region B, the orbiting scroll 12 is pushed
against the fixed scroll 11. Therefore, the lap-side end surface of the orbiting scroll
end plate 12a and the fixed scroll sliding surface 11e can maintain a tightly adhered
state without separating away from each other. Therefore, an amount of oil can be
adjusted by the first oil deriving hole 52 and the sliding surface groove 54, and
it is easy to adjust the amount of oil.
[0055] According to the scroll compressor of the embodiment, at a rotation position where
a center of an eccentric shaft center of the eccentric shaft 13a come closest to the
sliding surface groove 54, maximum centrifugal force is applied to lubricant oil existing
in the boss portion 12c. Hence, when the maximum centrifugal force is applied to the
lubricant oil existing in the boss portion 12c, the first oil deriving hole 52 and
the sliding surface groove 54 are brought into communication with each other. According
to this, it is possible to reliably introduced lubricant oil into the sliding surface
groove 54.
[0056] Figs. 4 are diagrams showing the rotation restraint member of the embodiment, wherein
Fig. 4(a) is a plan view of the rotation restraint member, Fig. 4(b) is sectional
view taken along a line B-B in Fig. 4(a), Fig. 4(c) is a sectional view taken along
a line C-C in Fig. 4(a), and Fig. 4(d) is a perspective view of the rotation restraint
member.
[0057] The rotation restraint member 17 includes an annular ring portion 17a, a pair of
fixed-side keys 17b which are slidably engaged with the pair of fixed-side guide grooves
11d formed in the fixed scroll 11, and a pair of turning-side keys 17c which are slidably
engaged with the pair of turning-side guide grooves 12d formed in the orbiting scroll
12.
[0058] The pair of fixed-side keys 17b are formed on one of ring surfaces of the ring portion
17a through a pedestal 17d.
[0059] The pair of turning-side keys 17c are formed on one of the ring surfaces of the ring
portion 17a.
[0060] A circumferential width dw of the pedestal 17d is larger than a circumferential width
bw of the fixed-side key 17b. A radial width cr of the turning-side key 17c is larger
than a radial width ar of the ring portion 17a. A radial inner end surface 17ci of
the turning-side key 17c projects more than an inner circumferential surface 17ai
of the ring portion 17a.
[0061] Since the fixed-side key 17b is formed on one of the ring surfaces of the ring portion
17a through the pedestal 17d, and the circumferential width dw of the pedestal 17d
is larger than the circumferential width bw of the fixed-side key 17b as described
above, it is possible to enhance rigidity of the fixed-side key 17b.
[0062] Further, the radial width cr of the turning-side key 17c is larger than the radial
width ar of the ring portion 17a, and the radial inner end surface 17ci of the turning-side
key 17c projects more than the inner circumferential surface 17ai of through ring
portion 17a. According to this, it is possible to enhance the rigidity of the turning-side
key 17c.
[0063] In this embodiment, a radial outer end surface 17do of the pedestal 17d is on the
same plane as an outer circumferential surface 17ao of the ring portion 17a, and a
radial outer end surface 17bo of the fixed-side key 17b projects more than the outer
circumferential surface 17ao of the ring portion 17a.
[0064] As described above, the radial outer end surface 17do of the pedestal 17d is on the
same plane as the outer circumferential surface 17ao of the ring portion 17a, and
the radial outer end surface 17bo of the fixed-side key 17b projects more than the
outer circumferential surface 17ao of the ring portion 17a. Therefore, it is possible
to further enhance the rigidity of the fixed-side key 17b.
[0065] The radial inner end surface 17di of the pedestal 17d is on the same plane as the
radial inner end surface 17bi of the fixed-side keys 17b, and a radial outer end surface
17co of the turning-side key 17c is on the same plane as an outer circumferential
surface 17ao of the ring portion 17a.
[0066] Figs. 5 are diagrams showing the main bearing and the rotation restraint member of
the embodiment, wherein Fig. 5(a) is a top view of the main bearing, and Fig. 5(b)
is a top view showing a state where the rotation restraint member is placed on the
main bearing.
[0067] The rotation restraint member 17 is placed in the rotation restraint member ring
recess 34 of the main bearing 30. The outer circumferential surface 17ao of the ring
portion 17a and the radial outer end surface 17do of the pedestal 17d have a slight
gap therebetween so that they do not abut against an outer circumferential surface
34o of the rotation restraint member ring recess 34. However, the radial outer end
surface 17bo of the fixed-side keys 17b does not abut against the outer circumferential
surface 34o of the rotation restraint member ring recess 34. That is, the ring portion
17a and the pedestal 17d are placed at positions lower than a thrust surface of the
main bearing 30, and the fixed-side keys 17b are placed at positions higher than the
thrust surface of the main bearing 30.
[0068] Figs. 6 are diagrams showing a rotation restraint member of another embodiment, and
Figs. 7 are diagrams showing a main bearing and the rotation restraint member of the
embodiment. Fig. 6(a) is a plan view of the rotation restraint member, Fig. 6(b) is
a sectional view taken along a line B-B in Fig. 6(a), Fig. 6(c) is a sectional view
taken along a line C-C in Fig. 6(a), Fig. 6(d) is a perspective view of the rotation
restraint member, Fig. 7(a) is a top view of the main bearing, and Fig. 7(b) is a
top view showing a state where the rotation restraint member is placed on the main
bearing.
[0069] The rotation restraint member 17 includes the annular ring portion 17a, the pair
of fixed-side keys 17b which are slidably engaged with the pair of fixed-side guide
grooves 11d formed in the fixed scroll 11, and the pair of turning-side keys 17c which
are slidably engaged with the pair of turning-side guide grooves 12d formed in the
orbiting scroll 12.
[0070] The pair of fixed-side keys 17b are formed on one of the ring surfaces of the ring
portion 17a through the pedestal 17d.
[0071] The pair of turning-side keys 17c are formed on one of the ring surfaces of the ring
portion 17a.
[0072] The circumferential width dw of the pedestal 17d is larger than the circumferential
width bw of the fixed-side keys 17b. The radial width cr of the turning-side keys
17c is larger than the radial width ar of the ring portion 17a. The radial inner end
surface 17ci of the turning-side keys 17c projects more than the inner circumferential
surface 17ai of the ring portion 17a.
[0073] Since the fixed-side keys 17b is formed on one of the ring surfaces of the ring portion
17a through the pedestal 17d and the circumferential width dw of the pedestal 17d
is larger than the circumferential width bw of the fixed-side keys 17b as described
above, it is possible to enhance rigidity of the fixed-side keys 17b.
[0074] Further, the radial width cr of the turning-side keys 17c is larger than the radial
width ar of the ring portion 17a, and the radial inner end surface 17ci of the turning-side
keys 17c projects more than the inner circumferential surface 17ai of the ring portion
17a. According to this, it is possible to enhance rigidity of the turning-side keys
17c.
[0075] The rotation restraint member 17 is placed in the rotation restraint member ring
recess 34 of the main bearing 30.
[0076] In the embodiment, the radial outer end surface 17do of the pedestal 17d and the
radial outer end surface 17bo of the fixed-side keys 17b are on the same plane as
the outer circumferential surface 17ao of the ring portion 17a, and a pair of escaping
portions 34x are formed on the outer circumferential surface 34o of the rotation restraint
member ring recess 34. The pair of escaping portions 34x are located at positions
corresponding to the fixed-side keys 17b. The ring portion 17a and the pedestal 17d
are located at positions lower than the thrust surface of the main bearing 30, and
the fixed-side keys 17b is located at a position higher than the thrust surface of
the main bearing 30. Therefore, the outer circumferential surface 17ao of the ring
portion 17a and the radial outer end surface 17do of the pedestal 17d are located
on the escaping portions 34x of the rotation restraint member ring recess 34.
[0077] As described above, the radial outer end surface 17do of the pedestal 17d and the
radial outer end surface 17bo of the fixed-side keys 17b are on the same plane as
the outer circumferential surface 17ao of the ring portion 17a, and the pair of escaping
portions 34x are located at the positions corresponding to the fixed-side keys 17b.
According to this, it is possible to further enhance rigidity of the fixed-side keys
17b.
[0078] The radial inner end surface 17di of the pedestal 17d is on the same plane as the
radial inner end surface 17bi of the fixed-side keys 17b, and the radial outer end
surface 17co of the turning-side keys 17c is on the same plane as the outer circumferential
surface 17ao of the ring portion 17a.
[INDUSTRIAL APPLICABILITY]
[0079] The scroll compressor of the present invention is useful in a refrigeration cycle
of a hydronic heater, an air conditioner, a hot water supply device and a freezer.
[EXPLANATION OF SYMBOLS]
[0080]
- 1
- hermetical container
- 1a
- body portion
- 1b
- lower lid
- 1c
- upper lid
- 2
- refrigerant sucking pipe
- 3
- refrigerant discharging pipe
- 4
- oil reservoir
- 5
- oil pump
- 6
- discharging chamber
- 10
- compressing mechanism portion
- 11
- fixed scroll
- 11a
- fixed scroll end plate
- 11b
- fixed scroll lap
- 11c
- outer circumferential wall
- 11d
- fixed-side guide groove
- 11e
- fixed scroll sliding surface
- 12
- orbiting scroll
- 12a
- orbiting scroll end plate
- 12b
- orbiting scroll lap
- 12c
- boss portion
- 12d
- turning-side guide groove
- 13
- rotation shaft
- 13a
- eccentric shaft
- 13b
- lower end
- 13c
- rotation shaft oil supply hole
- 13d
- turning bearing
- 13e
- oil groove
- 14
- discharging port
- 15
- compression chambers
- 15a
- suction port
- 16
- bolt
- 17
- rotation restraint member
- 17a
- ring portion
- 17ai
- inner circumferential surface
- 17ao
- outer circumferential surface
- 17b
- fixed-side key
- 17bi
- radial inner end surface
- 17bo
- radial outer end surface
- 17c
- turning-side key
- 17ci
- radial inner end surface
- 17co
- radial outer end surface
- 17d
- pedestal
- 18
- auxiliary bearing
- 20
- electric mechanical portion
- 21
- stator
- 22
- rotor
- 30
- main bearing
- 31
- bearing
- 32
- boss-accommodating portion
- 33
- seal ring recess
- 33a
- seal member
- 34
- rotation restraint member ring recess
- 34o
- outer circumferential surface
- 34x
- escaping portion
- 41
- intermediate pressure taking-out hole
- 42
- intermediate pressure communication passage
- 42a
- end plate-side intermediate pressure communication passage
- 42b
- circumferential wall-side intermediate pressure communication passage
- 51
- first oil introducing hole
- 52
- first oil deriving hole
- 53
- first end plate oil communication passage
- 54
- sliding surface groove
- 61
- second oil introducing hole
- 62
- second oil deriving hole
- 63
- second end plate oil communication passage
- A
- high pressure region
- B
- intermediate pressure region
- ar
- radial width
- bw
- circumferential width
- cr
- radial width
- dw
- circumferential width
1. A scroll compressor comprising a hermetical container, in which the hermetical container
is provided therein with a compressing mechanism portion for compressing refrigerant
and an electric mechanical portion for driving the compressing mechanism portion,
the compressing mechanism portion includes a fixed scroll, an orbiting scroll and
a rotation shaft for turning and driving the orbiting scroll,
the fixed scroll includes a disk-shaped fixed scroll end plate, and a fixed scroll
lap standing on the fixed scroll end plate,
the orbiting scroll includes a disk-shaped turning scroll end plate, an orbiting scroll
lap standing on a lap-side end surface of the orbiting scroll end plate, and a boss
portion formed on a side opposite from the lap-side end surface of the orbiting scroll
end plate,
an eccentric shaft which is inserted into the boss portion is formed on an upper end
of the rotation shaft,
the fixed scroll lap and the orbiting scroll lap are meshed with each other, a plurality
of compression chambers are formed between the fixed scroll lap and the orbiting scroll
lap,
a main bearing for supporting the fixed scroll and the orbiting scroll is provided
below the fixed scroll and the orbiting scroll,
a rotation restraint member for restraining the orbiting scroll from rotating is provided
between the fixed scroll and the main bearing,
a bearing portion for pivotally supporting the rotation shaft, a boss-accommodating
portion for accommodating the boss portion therein, and a rotation restraint member
ring recess where the rotation restraint member is placed are formed on the main bearing,
the rotation restraint member includes an annular ring portion, a pair of fixed-side
keys which are slidably engaged with a pair of fixed-side guide grooves formed in
the fixed scroll, and a pair of turning-side keys which are slidably engaged with
a pair of turning-side guide grooves formed in the orbiting scroll,
the boss-accommodating portion is a high pressure region, an outer circumferential
portion of the orbiting scroll where the rotation restraint member is placed is an
intermediate pressure region, and
the orbiting scroll is pushed against the fixed scroll by pressures of the high pressure
region and the intermediate pressure region, wherein
the pair of fixed-side keys are formed on one of ring surfaces of the ring portion
through a pedestal,
the pair of turning-side keys are formed on the one of the ring surfaces of the ring
portion,
a circumferential width of the pedestal is larger than a circumferential width of
the fixed-side key,
a radial width of the turning-side key is larger than a radial width of the ring portion,
and
a radial inner end surface of the turning-side key projects more than an inner circumferential
surface of the ring portion.
2. The scroll compressor according to claim 1, wherein a radial outer end surface of
the pedestal is located on a same plane as an outer circumferential surface of the
ring portion, and
a radial outer end surface of the fixed-side key projects more than the outer circumferential
surface of the ring portion.
3. The scroll compressor according to claim 1, wherein a radial outer end surface of
the pedestal and a radial outer end surface of the fixed-side key are located on a
same plane as an outer circumferential surface of the ring portion,
a pair of escaping portions are formed on an outer circumferential surface of the
rotation restraint member ring recess, and
the pair of escaping portions are located at positions corresponding to the fixed-side
keys.