EP0855508A1 - Scroll for scroll compressor - Google Patents
Scroll for scroll compressor Download PDFInfo
- Publication number
- EP0855508A1 EP0855508A1 EP98100894A EP98100894A EP0855508A1 EP 0855508 A1 EP0855508 A1 EP 0855508A1 EP 98100894 A EP98100894 A EP 98100894A EP 98100894 A EP98100894 A EP 98100894A EP 0855508 A1 EP0855508 A1 EP 0855508A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- scroll
- spiral
- wall
- mobile
- compressor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C18/00—Rotary-piston pumps specially adapted for elastic fluids
- F04C18/02—Rotary-piston pumps specially adapted for elastic fluids of arcuate-engagement type, i.e. with circular translatory movement of co-operating members, each member having the same number of teeth or tooth-equivalents
- F04C18/0207—Rotary-piston pumps specially adapted for elastic fluids of arcuate-engagement type, i.e. with circular translatory movement of co-operating members, each member having the same number of teeth or tooth-equivalents both members having co-operating elements in spiral form
- F04C18/0246—Details concerning the involute wraps or their base, e.g. geometry
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C18/00—Rotary-piston pumps specially adapted for elastic fluids
- F04C18/02—Rotary-piston pumps specially adapted for elastic fluids of arcuate-engagement type, i.e. with circular translatory movement of co-operating members, each member having the same number of teeth or tooth-equivalents
- F04C18/0207—Rotary-piston pumps specially adapted for elastic fluids of arcuate-engagement type, i.e. with circular translatory movement of co-operating members, each member having the same number of teeth or tooth-equivalents both members having co-operating elements in spiral form
- F04C18/0246—Details concerning the involute wraps or their base, e.g. geometry
- F04C18/0269—Details concerning the involute wraps
Definitions
- This invention relates to a scroll with improved durability for use in a scroll compressor.
- the former conventional scrolls for use in scroll compressors provide the following structures for their spirals.
- FIG. 1B shows an example in which the spiral 13a of the fixed scroll 13 is used in combination with the spiral 14a of the mobile scroll 14.
- the structure shown in (3) above is more rational than those shown in (1) and (2), from the view point of optimization of strength distribution along the height of the wall.
- the strength per scroll meat of the structure having the tapered wall shown in (3) is stronger than that of the structure having the straight wall shown in (1) and (2).
- sealing member 21 is attached to edge surfaces of both spirals 13a and 14a of the fixed scroll 13 and the mobile scroll 14, respectively, and the sealing members 21 for both spirals adjust the axial clearance C and maintain sealing capacity.
- liquid leakage due to internal compression from the clearance D in the direction of spiral walls between the wall 13a of the fixed scroll 13 and the wall 14a of the movable scroll 14 is greater as compared with that of the structures in (1) and (2).
- the total volume of liquid leakage of the structure having the tapered wall shown in (3) is more than that of the structure having the straight wall shown in (1) and (2), when the liquid leakage due to the internal compression from the clearance D is taken into account.
- a scroll compressor having a scroll equipping a spiral wall, the spiral wall having a tapered form at the central inner end portion thereof which does not affect compression or sealing capacity.
- a scroll compressor having a scroll equipping a spiral wall, the spiral wall having a tapered form at the outer end portion thereof which does not affect compression or sealing capacity.
- a scroll compressor having a scroll equipping a spiral wall, the spiral wall having a tapered form at the central inner end and the outer end portions thereof which do not affect compression or sealing capacity.
- the scroll compressor has a compressor housing 10 comprising a front end plate 11 onto which a cup-shaped portion 12 is fixed.
- the fixed scroll 13 comprises a side plate 13b, a spiral 13a formed on one side of the side plate 13b, and a base 13c placed on the side plate 13b opposite to the spiral 13a.
- the base 13c is fixed onto an inner wall of a bottom end 12a of a cup-shaped portion 12, by means of a bolt 15 screwed into the cup-shaped portion 12 from the outer surface of the cup-shaped portion 12.
- the gap between the outer surface of the side plate 13b of the fixed scroll 13 fixed inside the cup-shaped portion 12 and the inner surface of the cup-shaped portion 12 is sealed with a sealing material 23, thus partitioning an exhaust chamber 16 and an intake chamber 17 inside the cup-shaped portion 12.
- the mobile scroll 14 comprises a side plate 14b and a spiral 14a formed on one side of it.
- the spiral 14a and the spiral 13a of the fixed scroll 13 are arranged so as to exert compression strength on fluid.
- a shaft 18 of the scroll compressor passes through the frond end plate 11 and is supported so as to allow free rotation.
- the mobile scroll 14 is fixed onto the shaft 18 so that it revolves around a circular orbit as the shaft 18 rotates, without rotating on its own axis.
- the mechanism to allow revolution of the mobile scroll 14 while suppressing the rotation on its own axis is not detailed here, since numerous examples of such a mechanism have already been proposed and published.
- Fig. 5 shows the mobile scroll 14 according to the embodiment of this invention, which is an improved version of the conventional mobile scroll 14 shown in Figs. 3A and 3B.
- a portion of the spiral 14a having an inner wall formed as an involute 14e and an outer wall as an involute 14h is identical in form with its counterpart in the conventional example shown in Fig. 3A, and functions as a sealing surface.
- 14c is a base circle for the involute.
- the portion of the spiral 14a of the mobile scroll 14 according to an embodiment of this invention formed by a curve 14f approaching an origin 14d of the involute for the inner surface and a curve 14i approaching an origin 14g of the involute for the outer surface is shaped differently from its counterpart in the conventional example shown in Fig. 3A, since the wall of the spiral 14a is tapered from its base toward the edge at this portion (i.e., the surface S indicated in Figs. 6A and 6B). Therefore, the strength of the wall of the spiral 14a is greater than that of the conventional example. Furthermore, neither compression nor sealing capacity is affected since the surface S formed by the curve 14f approaching the origin 14d of the involute for the inner surface and by the curve 14i approaching the origin 14g of the involute for the outer surface is not a sealing surface.
- the outer end of the spiral 14a of the mobile scroll 14 according to the embodiment of this invention has an inner wall surface 14j, which is formed identically with that of the conventional example shown in Fig. 3B and is a sealing surface.
- An outer wall surface 14k has an edge surface 14l formed identically with that of the conventional example, but the wall thickness increases toward the base. That is, the surface 14k is slightly tapered.
- the outer wall surface 14k is not a sealing surface, so neither compression nor sealing capacity is affected. Therefore, working accuracy is not so strict as that required for a sealing surface. Casting surface is also acceptable for the outer wall surface 14k.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Rotary Pumps (AREA)
Abstract
In a scroll compressor, strength of a spiral wall
in a scroll is improved, without deteriorating
workability or increasing liquid leakage due to internal
compression. A part of a spiral in a mobile scroll (as
well as in a fixed scroll) around the central inner end
(as well as around the outer end) formed by a curve
approaching the origin of an involute forming the inner
surface of the spiral and by a curve approaching the
origin of an involute forming the outer surface of the
spiral is shaped differently from that of conventional
examples, its wall being thicker at the base and tapered
toward the edge. Therefore, strength of the spiral wall
in a scroll is improved as compared with a conventional
example, and neither compression nor sealing capacity is
affected since neither of the parts of the spiral with
tapered walls mentioned above acts as a sealing surface.
Description
This invention relates to a scroll with improved
durability for use in a scroll compressor.
The former conventional scrolls for use in scroll
compressors provide the following structures for their
spirals.
An example of this structure is disclosed in
Japanese Unexamined Patent Publication (JP-A) No.
225002/1991. Furthermore, Fig. 1B shows an example in
which the spiral 13a of the fixed scroll 13 is used in
combination with the spiral 14a of the mobile scroll 14.
With respect to the wall thickness of a spiral of
a scroll, the structure shown in (3) above is more
rational than those shown in (1) and (2), from the view
point of optimization of strength distribution along the
height of the wall. In other words, the strength per
scroll meat of the structure having the tapered wall
shown in (3) is stronger than that of the structure
having the straight wall shown in (1) and (2).
However, the structure shown in (3) with the wall
of the spiral tapered along the entire circumference
poses difficulty concerning workability and control of
the dimensional accuracy as compared with the structures
in (1) and (2) with straight walls. Furthermore, as
shown in an exaggerated manner in Figs. 2A and 2B, fluid
leakage due to internal compression from axial clearance
C at the sealed parts between the fixed scroll 13 and the
mobile scroll 14 do not differ significantly among the
structures in (1), (2), and (3). Here, sealing member 21
is attached to edge surfaces of both spirals 13a and 14a
of the fixed scroll 13 and the mobile scroll 14,
respectively, and the sealing members 21 for both spirals
adjust the axial clearance C and maintain sealing
capacity. However, for the structure in (3), liquid
leakage due to internal compression from the clearance D
in the direction of spiral walls between the wall 13a of
the fixed scroll 13 and the wall 14a of the movable
scroll 14 is greater as compared with that of the
structures in (1) and (2). Namely, the total volume of
liquid leakage of the structure having the tapered wall
shown in (3) is more than that of the structure having
the straight wall shown in (1) and (2), when the liquid
leakage due to the internal compression from the
clearance D is taken into account.
It is therefore an object of this invention to
improve the strength of spiral walls in a scroll of a
scroll compressor, without deteriorating workability for
the walls in a scroll, and furthermore without increasing
liquid leakage due to internal compression.
According to this invention, there is provided a
scroll compressor having a scroll equipping a spiral
wall, the spiral wall having a tapered form at the
central inner end portion thereof which does not affect
compression or sealing capacity.
Also according to this invention, there is
provided a scroll compressor having a scroll equipping a
spiral wall, the spiral wall having a tapered form at the
outer end portion thereof which does not affect
compression or sealing capacity.
Furthermore, according to this invention, there
is also provided a scroll compressor having a scroll
equipping a spiral wall, the spiral wall having a tapered
form at the central inner end and the outer end portions
thereof which do not affect compression or sealing
capacity.
Referring to Figs. 4 to 7, the description will
proceed to a preferred embodiment of this invention.
At first, the entire mechanism of a scroll
compressor according to a preferred embodiment of this
invention will be outlined.
In Fig. 4, the scroll compressor has a compressor
housing 10 comprising a front end plate 11 onto which a
cup-shaped portion 12 is fixed.
Within the compressor housing 10 a fixed scroll
13 and a mobile scroll 14 are placed. The fixed scroll
13 comprises a side plate 13b, a spiral 13a formed on one
side of the side plate 13b, and a base 13c placed on the
side plate 13b opposite to the spiral 13a. The base 13c
is fixed onto an inner wall of a bottom end 12a of a
cup-shaped portion 12, by means of a bolt 15 screwed into
the cup-shaped portion 12 from the outer surface of the
cup-shaped portion 12. On the other hand, the gap
between the outer surface of the side plate 13b of the
fixed scroll 13 fixed inside the cup-shaped portion 12
and the inner surface of the cup-shaped portion 12 is
sealed with a sealing material 23, thus partitioning an
exhaust chamber 16 and an intake chamber 17 inside the
cup-shaped portion 12.
The mobile scroll 14 comprises a side plate 14b
and a spiral 14a formed on one side of it. The spiral
14a and the spiral 13a of the fixed scroll 13 are
arranged so as to exert compression strength on fluid. A
shaft 18 of the scroll compressor passes through the
frond end plate 11 and is supported so as to allow free
rotation. The mobile scroll 14 is fixed onto the shaft
18 so that it revolves around a circular orbit as the
shaft 18 rotates, without rotating on its own axis. The
mechanism to allow revolution of the mobile scroll 14
while suppressing the rotation on its own axis is not
detailed here, since numerous examples of such a
mechanism have already been proposed and published.
When the mobile scroll 14 is motivated by the
shaft 18, liquid flows into the intake chamber 17 inside
the compressor housing 10, through an intake port 19
formed on the cup-shaped portion 12. From here, the
liquid is taken into a pocket formed between the spirals
13a and 14a. Furthermore, the liquid is sent to the
central part of the mechanism while being pressurized
gradually by the motion of the mobile scroll 14, pressed
into the exhaust chamber 16 through an exhaust port 13d
opened on the side plate 13b of the fixed scroll 13, and
then sent out of the compressor housing 10 through an
exhaust port 20.
Further, the description will proceed to the form
of a spiral of a mobile scroll in a scroll compressor,
referring to Figs. 5 to 7. It should be noted that since
a fixed scroll is matched with a mobile scroll, the form
of the fixed scroll is symmetrical with that of the
mobile scroll.
Fig. 5 shows the mobile scroll 14 according to
the embodiment of this invention, which is an improved
version of the conventional mobile scroll 14 shown in
Figs. 3A and 3B.
Referring to Figs. 6A and 6B which show a mobile
scroll 14 according to the embodiment of this invention,
a portion of the spiral 14a having an inner wall formed
as an involute 14e and an outer wall as an involute 14h
is identical in form with its counterpart in the
conventional example shown in Fig. 3A, and functions as a
sealing surface. Here, 14c is a base circle for the
involute.
The portion of the spiral 14a of the mobile
scroll 14 according to an embodiment of this invention
formed by a curve 14f approaching an origin 14d of the
involute for the inner surface and a curve 14i
approaching an origin 14g of the involute for the outer
surface is shaped differently from its counterpart in the
conventional example shown in Fig. 3A, since the wall of
the spiral 14a is tapered from its base toward the edge
at this portion (i.e., the surface S indicated in Figs.
6A and 6B). Therefore, the strength of the wall of the
spiral 14a is greater than that of the conventional
example. Furthermore, neither compression nor sealing
capacity is affected since the surface S formed by the
curve 14f approaching the origin 14d of the involute for
the inner surface and by the curve 14i approaching the
origin 14g of the involute for the outer surface is not a
sealing surface.
In Fig. 7, the outer end of the spiral 14a of the
mobile scroll 14 according to the embodiment of this
invention has an inner wall surface 14j, which is formed
identically with that of the conventional example shown
in Fig. 3B and is a sealing surface. An outer wall
surface 14k has an edge surface 14l formed identically
with that of the conventional example, but the wall
thickness increases toward the base. That is, the
surface 14k is slightly tapered. The outer wall surface
14k is not a sealing surface, so neither compression nor
sealing capacity is affected. Therefore, working
accuracy is not so strict as that required for a sealing
surface. Casting surface is also acceptable for the
outer wall surface 14k.
According to the foregoing description, it is
apparent that the following effects can be obtained
according to the present invention.
Claims (3)
- A scroll compressor having a scroll equipping a spiral wall, said spiral wall having a tapered form at the central inner end portion thereof which does not affect compression or sealing capacity.
- A scroll compressor having a scroll equipping a spiral wall, said spiral wall having a tapered form at the outer end portion thereof which does not affect compression or sealing capacity.
- A scroll compressor having a scroll equipping a spiral wall, said spiral wall having a tapered form at the central inner end and the outer end portions thereof which do not affect compression or sealing capacity.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP962597A JPH10205468A (en) | 1997-01-22 | 1997-01-22 | Scroll type compressor |
JP9625/97 | 1997-01-22 |
Publications (1)
Publication Number | Publication Date |
---|---|
EP0855508A1 true EP0855508A1 (en) | 1998-07-29 |
Family
ID=11725455
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP98100894A Withdrawn EP0855508A1 (en) | 1997-01-22 | 1998-01-20 | Scroll for scroll compressor |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP0855508A1 (en) |
JP (1) | JPH10205468A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1227245A3 (en) * | 2001-01-25 | 2003-07-09 | Kabushiki Kaisha Toyota Jidoshokki | Scroll type compressor |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP5166327B2 (en) * | 2009-03-13 | 2013-03-21 | 株式会社ケーヒン | Scroll compressor |
WO2021090423A1 (en) * | 2019-11-07 | 2021-05-14 | 三菱電機株式会社 | Scroll compressor and refrigeration cycle device |
Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5813184A (en) | 1981-07-16 | 1983-01-25 | Sanden Corp | Scroll type compressor |
JPS58172405A (en) * | 1982-04-05 | 1983-10-11 | Hitachi Ltd | Scroll fluid machine |
EP0106288A1 (en) * | 1982-10-09 | 1984-04-25 | Sanden Corporation | Scroll type compressor |
JPH01130083A (en) * | 1987-11-16 | 1989-05-23 | Sanyo Electric Co Ltd | Scroll compressor |
EP0392975A1 (en) * | 1989-04-08 | 1990-10-17 | AGINFOR AG für industrielle Forschung | Rotary scroll supercharger for compressible media |
US5037279A (en) * | 1988-09-19 | 1991-08-06 | Hitachi, Ltd. | Scroll fluid machine having wrap start portion with thick base and thin tip |
JPH03225002A (en) | 1990-01-31 | 1991-10-04 | Hitachi Ltd | Scroll fluid machinery |
US5059102A (en) * | 1988-12-13 | 1991-10-22 | Mitsubishi Denki K.K. | Fluid scroll machine with peripherally attached counter weights and reduced thickness scroll |
JPH04279785A (en) | 1991-03-06 | 1992-10-05 | Toyota Autom Loom Works Ltd | Scroll type compressor |
-
1997
- 1997-01-22 JP JP962597A patent/JPH10205468A/en not_active Withdrawn
-
1998
- 1998-01-20 EP EP98100894A patent/EP0855508A1/en not_active Withdrawn
Patent Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5813184A (en) | 1981-07-16 | 1983-01-25 | Sanden Corp | Scroll type compressor |
JPS58172405A (en) * | 1982-04-05 | 1983-10-11 | Hitachi Ltd | Scroll fluid machine |
EP0106288A1 (en) * | 1982-10-09 | 1984-04-25 | Sanden Corporation | Scroll type compressor |
JPH01130083A (en) * | 1987-11-16 | 1989-05-23 | Sanyo Electric Co Ltd | Scroll compressor |
US5037279A (en) * | 1988-09-19 | 1991-08-06 | Hitachi, Ltd. | Scroll fluid machine having wrap start portion with thick base and thin tip |
US5059102A (en) * | 1988-12-13 | 1991-10-22 | Mitsubishi Denki K.K. | Fluid scroll machine with peripherally attached counter weights and reduced thickness scroll |
EP0392975A1 (en) * | 1989-04-08 | 1990-10-17 | AGINFOR AG für industrielle Forschung | Rotary scroll supercharger for compressible media |
JPH03225002A (en) | 1990-01-31 | 1991-10-04 | Hitachi Ltd | Scroll fluid machinery |
JPH04279785A (en) | 1991-03-06 | 1992-10-05 | Toyota Autom Loom Works Ltd | Scroll type compressor |
Non-Patent Citations (2)
Title |
---|
PATENT ABSTRACTS OF JAPAN vol. 13, no. 376 (M - 862)<3724> 21 August 1989 (1989-08-21) * |
PATENT ABSTRACTS OF JAPAN vol. 8, no. 9 (M - 268)<1446> 14 January 1984 (1984-01-14) * |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1227245A3 (en) * | 2001-01-25 | 2003-07-09 | Kabushiki Kaisha Toyota Jidoshokki | Scroll type compressor |
US6663365B2 (en) | 2001-01-25 | 2003-12-16 | Kabushiki Kaisha Toyota Jidoshokki | Scroll type compressor |
Also Published As
Publication number | Publication date |
---|---|
JPH10205468A (en) | 1998-08-04 |
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