CA2042204C - Scroll type fluid machinery - Google Patents
Scroll type fluid machineryInfo
- Publication number
- CA2042204C CA2042204C CA002042204A CA2042204A CA2042204C CA 2042204 C CA2042204 C CA 2042204C CA 002042204 A CA002042204 A CA 002042204A CA 2042204 A CA2042204 A CA 2042204A CA 2042204 C CA2042204 C CA 2042204C
- Authority
- CA
- Canada
- Prior art keywords
- pressure chamber
- scroll
- housing
- low
- end plate
- 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.)
- Expired - Fee Related
Links
- 239000012530 fluid Substances 0.000 title claims abstract description 9
- 238000005192 partition Methods 0.000 claims abstract 2
- 230000002093 peripheral effect Effects 0.000 claims 5
- 238000000638 solvent extraction Methods 0.000 claims 1
- 208000036366 Sensation of pressure Diseases 0.000 abstract 1
- 230000002159 abnormal effect Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 1
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
-
- 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
- F04C18/0215—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 where only one member is moving
-
- 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
- F04C2230/00—Manufacture
- F04C2230/60—Assembly methods
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
- F05B2230/00—Manufacture
- F05B2230/60—Assembly methods
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Rotary Pumps (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
- Compressor (AREA)
Abstract
According to the present invention, there is provided a scroll type fluid machinery in which a sta-tionary scroll and a revolving scroll provided with spiral wraps set up on end plates, respectively, are engaged with each other and housed in a housing, the stationary scroll is fixed to the housing, and the revolving scroll is made to revolve in a solar motion while checking the rotation on its axis by means of a mechanism for checking rotation on its axis, wherein a low pressure chamber forming unit which partitions the inside of the housing into a low pressure chamber and a high pressure chamber of above-mentioned machinery is disposed on the outside of the end plate of the stationary scroll, and a low pressure chamber which communicates with the low pressure chamber is formed between the end plate of the stationary scroll and the high pressure chamber by means of this low pres-sure chamber forming unit, thereby to prevent or reduce deformation of the end plate of the stationary scroll.
Description
2042204 ~1326-168 SPECIFICATION
l. TITLE OF THE INVENTION
SCROLL TYPE FLUID MACHINERY
FIELD OF THE INVENTION
The present lnventlon relates to a scroll type fluid machlnery used as a compressor, an expanslon machlnery and the llke.
BRIEF DESCRIPTION OF THE DRAWINGS
Flg. 1 ls a longltudlnal sectlonal vlew showlng a flrst embodlment of the present lnventlon;
Flg. 2 ls a partlal longltudlnal sectlonal vlew showlng a second embodlment of the present lnventlon; and Flg. 3 ls a longltudlnal sectlonal vlew of a conventlonal scroll type compressor.
BACKGROUND OF THE INVENTION
Flg. 3 shows an example of a conventlonal scroll type compressor.
In Flg. 3, a houslng 1 conslsts of a cup-shaped maln body 2, a front end plate 4 whlch ls clamped to the maln body 2 wlth bolts not shown, and a front cover 6 whlch is clamped to the front end plate 4 wlth a bolt 5. A rotary shaft 7 penetrates through the front cover 6 and is supported rotatably by the houslng 1 through a bearlng 8 provlded between the front cover 6 and the rotary shaft 7 and a bearlng 9 provided between a boss 7a thereof and the front end plate 4.
A stationary scroll 10 and a revolving scroll 14 are housed lnslde the houslng 1.
....
The statlonary scroll 10 is provlded wlth an end plate 11 and a splral wrap 12 set up on the lnner surface thereof and the outer perlpheral surface of the end plate 11 ls brought lnto close contact wlth the lnner perlpheral surface of the cup-shaped maln body 2 and clamped wlth a bolt 13 thereto. Thus, a hlgh pressure chamber 31 ls dellmlted on the outslde of the end plate 11, and a low pressure chamber 32 ls dellmlted on the lnslde thereof.
The revolving scroll 14 ls provlded wlth an end plate 15 and a splral wrap 16 set up on the lnslde surface thereof, and the splral wrap 16 has substantlally the same conflguratlon as the splral wrap 12.
The revolvlng scroll 14 and the statlonary scroll 10 are eccentrlc from each other by the radlus of revolutlon, and are engaged wlth each other whlle shlftlng by an angle of 180 mutually as shown ln the figure. At thls tlme, a chlp seal 17 dlsposed on an end surface of the splral wrap 12 ls brought lnto close contact wlth the lnner surface of the end plate 15, a chlp seal 18 embedded ln the end surface of the splral wrap 16 ls brought lnto close contact wlth the lnner surface of the end plate 11, and slde surfaces of the splral wraps 12 and 16 are brought lnto llnear contact wlth each other at a plurallty of locatlons.
In such a manner, a plurallty of closed small chambers l9a and l9b whlch form an approxlmate polnt symmetry wlth respect to the center of the splral are dellmlted.
A bushlng 21 ls fltted rotatably ln a cyllndrlcal boss 20 pro~ected at the central part of the outer surface of the end plate 15 of the revolvlng scroll 14 through a rotary bearlng 23, s - ~
and an eccentrlc pln 25 pro~ected at an lnner end of the rotary shaft 7 ls fltted rotatably ln an eccentrlc hole 24 bored ln the bushlng 21. Further, a balance welght 27 ls flxed to thls bushlng 21.
A mechanlsm 26 for checklng rotatlon on lts axls whlch also serves as a thrust bearlng ls arranged between the outer perlpheral edge of the outer surface of the end plate 15 and the lnner surface of the front end plate 4. A sub-balance welght 28 ls clamped on the boss 7a of the rotary shaft 7.
Thus, when the rotary shaft 7 ls rotated, the revolvlng scroll 14 ls drlven through the eccentrlc pln 25, the bushlng 21, the rotary bearlng 23 and the boss 20, and the revolvlng scroll 14 revolves ln a solar motlon whlle belng checked to rotate on lts axls by means of the mechanlsm 26 for checklng rotatlon on lts axls.
When the revolutlon ln a solar motlon of the revolvlng scroll 14, the llnear contact portlon between the splral wraps 12 and 16 moves toward the center of the splral gradually. As a result, the closed small chambers l9a and l9b move toward the center of the splral whlle reduclng volumes thereof. In keeplng wlth thls, a gas suctloned lnto the low pressure chamber 32 through a suctlon port not shown ls taken lnto the closed small chambers l9a and l9b from openlng portlons at outer perlpheral ends of the splral wraps 12 and 16 and reaches a central chamber 22 whlle belng compressed. Then, the gas passes through a dlscharge port 29 bored ln the end plate 11 of the statlonary scroll 10 therefrom and pushes a dlscharged valve 30 open so as to be dlscharged lnto the hlgh pressure chamber 31, and flows out ; ~ ~
through a discharge port not shown.
In above-mentloned conventlonal scroll type compressor, there ls a fear that a hlgh pressure gas ln the above-mentloned hlgh pressure chamber 31 acts on the outer surface of the end plate 11 of the statlonary scroll 10 durlng operatlon, thereby to deform the end plate 11 to show depresslon at the center thereof.
When the end plate ll ls deformed, problem~ such as galllng, abnormal frlction and selzure on the lnner surface of the end plate 11, partlcularly between the central part thereof and the tlp surface of the splral wrap 16 of the revolvlng scroll 14 and damages at the tlp portlon of the splral wrap 16 are produced.
Therefore, lt has been requlred to take such a countermeasure that the thlckness of the end plate 11 ls lncreased or the tooth height at the central part of the spiral of the spiral lap 16 ls made lower than that of the other parts. In such a countermeasure, however, there has been such a problem that the efflclency thereof ls lowered.
OBJECT AND SUMMARY OF THF INVFNTION
It ls an ob~ect of the present lnventlon whlch has been made ln vlew of such clrcumstances to provlde a scroll type fluld machlnery ln whlch above-descrlbed problems are solved and rellablllty 18 lmproved.
In order to achleve above-mentloned ob~ect, lt ls the glst of the present lnventlon to provlde a scroll type fluld machlnery ln whlch a statlonary scroll and a revolvlng scroll provlded wlth splral wraps set up on end plates, respectlvely, are engaged wlth each other and housed ln a houslng, the statlonary .~ ~
scroll is flxed to the housing, and the revolvlng scroll ls made to revolve ln a solar motlon whlle checklng the rotatlon on lts axls by means of a mechanlsm for checklng rotatlon on lts axls, characterlzed ln that a low pressure chamber formlng unlt whlch partltlons the lnslde of the houslng lnto a low pressure chamber and a hlgh pressure chamber of above-mentloned machlnery ls dlsposed on the outslde of the end plate of the statlonary scroll, and a low pressure chamber whlch communlcates wlth the low pressure chamber ls formed between the end plate of the statlonary scroll and the hlgh pressure chamber by means of thls low pressure chamber formlng unlt.
In accordance wlth the present lnventlon there ls provlded a scroll-type fluld machlnery lncludlng a houslng sealed by a cup-shape maln body formed wlth an openlng at one end and a front cover assembly comblned wlth sald maln body so as to close sald openlng, sald houslng contalnlng a statlonary scroll and a revolvlng scroll, both formed wlth splral wraps set uprlght on end plates thereof respectlvely, sald statlonary and revolvlng scrolls belng adapted to engage each other, sald statlonary scroll belng flxed toward the bottom slde of sald houslng sald revolvlng scroll belng adapted to revolve ln solar motlon whlle checklng lts rotatlon by rotatlon-checklng means and a compressed fluld belng dlscharged from a dlscharge port formed ln the end plate of sald statlonary scroll lnto a hlgh-pressure chamber formed ln sald houslng characterlzed ln that a low-pressure chamber formlng unlt ls dlsposed outslde of the end plate of sald statlonary scroll so as to partltlon the lnslde of sald houslng lnto a flrst low-2Q4220~ 21326-168 pressure chamber and sald hlgh-pre~sure chamber and to posltlon sald high-pressure chamber toward the bottom slde of sald houslng the outer perlpheral surface of sald low-pressure formlng unlt belng caused to flt the lnner perlpheral surface of sald cup-shape maln body and a second low-pressure to communlcate wlth sald flrst low-pressure chamber ls formed between the end plate of sald statlonary scroll and sald hlgh-pressure chamber by means of sald low-pressure chamber formlng unlt sald low-pressure formlng unlt and sald statlonary scroll belng flxedly fastened to sald houslng by means of bolts from outslde sald houslng.
In the present lnventlon, the low pressure ln the low pressure chamber ls applled to the outer surface of the end plate of the statlonary ~croll wlth the constructlon descrlbed above.
Therefore, deforrnatlon of the end plate 18 prevented or reduced.
As lt ls evldent from above descrlptlon, ln the present lnventlon, the low pressure ln the low-pressure chamber ls applled to the outer surface of the end plate of the statlonary scroll, thus preventlng or reduclng deformatlon of the end plate.
As a result, lt ls posslble to prevent abnormal frlctlon, selzure and galllng between the lnner surface of the end plate of the statlonary scroll and the tlp surface of the splral lap of the revolvlng scroll and damages of the splral lap, thus lmprovlng rellablllty of a scroll type fluld machlnery.
DETAILED DBSCRIPTION OF A ~ K~ EMBODIMFNT
A preferred embodlment of the present lnventlon wlll be descrlbed ln detall lllustratlvely hereafter wlth reference to the drawlngs.
Fig. 1 shows a first embodlment of the present lnventlon.
A low pressure chamber formlng unlt 33 18 dlsposed on the outslde of an end plate 11 of a statlonary scroll 10, and ls clamped to a cup-shaped maln body 2 together wlth the statlonary scroll 10 by means of a bolt 13. The outer perlpheral surface of the unlt 33 ls lnstalled on an lnner perlpheral surface of the cup-shaped maln body 2 through a seal rlng 35 so as to form an alrtlght structure, so that the lnslde of a houslng 1 ls partltloned lnto a low pressure chamber 32 and a hlgh pressure chamber 31 by means of the unlt 33. Further, a low pressure chamber 34 ls dellmlted between the end plate 11 of the statlonary scroll 10 and the hlgh pressure chamber 31 by means of the unlt 33, and the low pressure chamber 34 communlcates wlth the low pressure chamber 32 through a through hole 36.
A hole 37 whlch communlcates wlth a dlscharge port 29 ls bored at the central part of the unlt 33, and a tip of a cylindrical boss 38 projected toward the end plate 11 around the hole 37 is attached onto the outer surface of the end plate 11 through a seal ring 39 so as to form an airtight structure. Further, a discharge valve 30 opens and closes the outlet of the hole 37.
Other constructions are similar to 'hat of a conventional compressor shown in Fig. 3. Same symbols are assigned to corresponding members, and the descrip-tion thereof is omitted herein.
Thus, at the time of operation of a scroll type compressor, a low pressure gas suctioned into the low pressure chamber 32 enters into the low pressure chamber 34 through the through hole 36. Accordingly, the low pressure gas in the low pressure chamber 34 acts on the outer surface of the end plate 11 of the stationary scroll 10, and the pressing force applied to the end plate 11 becomes smaller substantially as compared with a conventional compressor, thereby to prevent or reduce deformation of the end plate 11.
Fig. 2 shows a second embodiment of the present invention, wherein the hole 37 is enlarged, the discharge valve 30 is disposed at the bottom of the hole 37, and the outlet of the discharge port 29 is opened and closed by means of the discharge valve 30.
In the second embodiment, the top clearance volume is reduced and performance of a compressor may be improved.
l. TITLE OF THE INVENTION
SCROLL TYPE FLUID MACHINERY
FIELD OF THE INVENTION
The present lnventlon relates to a scroll type fluid machlnery used as a compressor, an expanslon machlnery and the llke.
BRIEF DESCRIPTION OF THE DRAWINGS
Flg. 1 ls a longltudlnal sectlonal vlew showlng a flrst embodlment of the present lnventlon;
Flg. 2 ls a partlal longltudlnal sectlonal vlew showlng a second embodlment of the present lnventlon; and Flg. 3 ls a longltudlnal sectlonal vlew of a conventlonal scroll type compressor.
BACKGROUND OF THE INVENTION
Flg. 3 shows an example of a conventlonal scroll type compressor.
In Flg. 3, a houslng 1 conslsts of a cup-shaped maln body 2, a front end plate 4 whlch ls clamped to the maln body 2 wlth bolts not shown, and a front cover 6 whlch is clamped to the front end plate 4 wlth a bolt 5. A rotary shaft 7 penetrates through the front cover 6 and is supported rotatably by the houslng 1 through a bearlng 8 provlded between the front cover 6 and the rotary shaft 7 and a bearlng 9 provided between a boss 7a thereof and the front end plate 4.
A stationary scroll 10 and a revolving scroll 14 are housed lnslde the houslng 1.
....
The statlonary scroll 10 is provlded wlth an end plate 11 and a splral wrap 12 set up on the lnner surface thereof and the outer perlpheral surface of the end plate 11 ls brought lnto close contact wlth the lnner perlpheral surface of the cup-shaped maln body 2 and clamped wlth a bolt 13 thereto. Thus, a hlgh pressure chamber 31 ls dellmlted on the outslde of the end plate 11, and a low pressure chamber 32 ls dellmlted on the lnslde thereof.
The revolving scroll 14 ls provlded wlth an end plate 15 and a splral wrap 16 set up on the lnslde surface thereof, and the splral wrap 16 has substantlally the same conflguratlon as the splral wrap 12.
The revolvlng scroll 14 and the statlonary scroll 10 are eccentrlc from each other by the radlus of revolutlon, and are engaged wlth each other whlle shlftlng by an angle of 180 mutually as shown ln the figure. At thls tlme, a chlp seal 17 dlsposed on an end surface of the splral wrap 12 ls brought lnto close contact wlth the lnner surface of the end plate 15, a chlp seal 18 embedded ln the end surface of the splral wrap 16 ls brought lnto close contact wlth the lnner surface of the end plate 11, and slde surfaces of the splral wraps 12 and 16 are brought lnto llnear contact wlth each other at a plurallty of locatlons.
In such a manner, a plurallty of closed small chambers l9a and l9b whlch form an approxlmate polnt symmetry wlth respect to the center of the splral are dellmlted.
A bushlng 21 ls fltted rotatably ln a cyllndrlcal boss 20 pro~ected at the central part of the outer surface of the end plate 15 of the revolvlng scroll 14 through a rotary bearlng 23, s - ~
and an eccentrlc pln 25 pro~ected at an lnner end of the rotary shaft 7 ls fltted rotatably ln an eccentrlc hole 24 bored ln the bushlng 21. Further, a balance welght 27 ls flxed to thls bushlng 21.
A mechanlsm 26 for checklng rotatlon on lts axls whlch also serves as a thrust bearlng ls arranged between the outer perlpheral edge of the outer surface of the end plate 15 and the lnner surface of the front end plate 4. A sub-balance welght 28 ls clamped on the boss 7a of the rotary shaft 7.
Thus, when the rotary shaft 7 ls rotated, the revolvlng scroll 14 ls drlven through the eccentrlc pln 25, the bushlng 21, the rotary bearlng 23 and the boss 20, and the revolvlng scroll 14 revolves ln a solar motlon whlle belng checked to rotate on lts axls by means of the mechanlsm 26 for checklng rotatlon on lts axls.
When the revolutlon ln a solar motlon of the revolvlng scroll 14, the llnear contact portlon between the splral wraps 12 and 16 moves toward the center of the splral gradually. As a result, the closed small chambers l9a and l9b move toward the center of the splral whlle reduclng volumes thereof. In keeplng wlth thls, a gas suctloned lnto the low pressure chamber 32 through a suctlon port not shown ls taken lnto the closed small chambers l9a and l9b from openlng portlons at outer perlpheral ends of the splral wraps 12 and 16 and reaches a central chamber 22 whlle belng compressed. Then, the gas passes through a dlscharge port 29 bored ln the end plate 11 of the statlonary scroll 10 therefrom and pushes a dlscharged valve 30 open so as to be dlscharged lnto the hlgh pressure chamber 31, and flows out ; ~ ~
through a discharge port not shown.
In above-mentloned conventlonal scroll type compressor, there ls a fear that a hlgh pressure gas ln the above-mentloned hlgh pressure chamber 31 acts on the outer surface of the end plate 11 of the statlonary scroll 10 durlng operatlon, thereby to deform the end plate 11 to show depresslon at the center thereof.
When the end plate ll ls deformed, problem~ such as galllng, abnormal frlction and selzure on the lnner surface of the end plate 11, partlcularly between the central part thereof and the tlp surface of the splral wrap 16 of the revolvlng scroll 14 and damages at the tlp portlon of the splral wrap 16 are produced.
Therefore, lt has been requlred to take such a countermeasure that the thlckness of the end plate 11 ls lncreased or the tooth height at the central part of the spiral of the spiral lap 16 ls made lower than that of the other parts. In such a countermeasure, however, there has been such a problem that the efflclency thereof ls lowered.
OBJECT AND SUMMARY OF THF INVFNTION
It ls an ob~ect of the present lnventlon whlch has been made ln vlew of such clrcumstances to provlde a scroll type fluld machlnery ln whlch above-descrlbed problems are solved and rellablllty 18 lmproved.
In order to achleve above-mentloned ob~ect, lt ls the glst of the present lnventlon to provlde a scroll type fluld machlnery ln whlch a statlonary scroll and a revolvlng scroll provlded wlth splral wraps set up on end plates, respectlvely, are engaged wlth each other and housed ln a houslng, the statlonary .~ ~
scroll is flxed to the housing, and the revolvlng scroll ls made to revolve ln a solar motlon whlle checklng the rotatlon on lts axls by means of a mechanlsm for checklng rotatlon on lts axls, characterlzed ln that a low pressure chamber formlng unlt whlch partltlons the lnslde of the houslng lnto a low pressure chamber and a hlgh pressure chamber of above-mentloned machlnery ls dlsposed on the outslde of the end plate of the statlonary scroll, and a low pressure chamber whlch communlcates wlth the low pressure chamber ls formed between the end plate of the statlonary scroll and the hlgh pressure chamber by means of thls low pressure chamber formlng unlt.
In accordance wlth the present lnventlon there ls provlded a scroll-type fluld machlnery lncludlng a houslng sealed by a cup-shape maln body formed wlth an openlng at one end and a front cover assembly comblned wlth sald maln body so as to close sald openlng, sald houslng contalnlng a statlonary scroll and a revolvlng scroll, both formed wlth splral wraps set uprlght on end plates thereof respectlvely, sald statlonary and revolvlng scrolls belng adapted to engage each other, sald statlonary scroll belng flxed toward the bottom slde of sald houslng sald revolvlng scroll belng adapted to revolve ln solar motlon whlle checklng lts rotatlon by rotatlon-checklng means and a compressed fluld belng dlscharged from a dlscharge port formed ln the end plate of sald statlonary scroll lnto a hlgh-pressure chamber formed ln sald houslng characterlzed ln that a low-pressure chamber formlng unlt ls dlsposed outslde of the end plate of sald statlonary scroll so as to partltlon the lnslde of sald houslng lnto a flrst low-2Q4220~ 21326-168 pressure chamber and sald hlgh-pre~sure chamber and to posltlon sald high-pressure chamber toward the bottom slde of sald houslng the outer perlpheral surface of sald low-pressure formlng unlt belng caused to flt the lnner perlpheral surface of sald cup-shape maln body and a second low-pressure to communlcate wlth sald flrst low-pressure chamber ls formed between the end plate of sald statlonary scroll and sald hlgh-pressure chamber by means of sald low-pressure chamber formlng unlt sald low-pressure formlng unlt and sald statlonary scroll belng flxedly fastened to sald houslng by means of bolts from outslde sald houslng.
In the present lnventlon, the low pressure ln the low pressure chamber ls applled to the outer surface of the end plate of the statlonary ~croll wlth the constructlon descrlbed above.
Therefore, deforrnatlon of the end plate 18 prevented or reduced.
As lt ls evldent from above descrlptlon, ln the present lnventlon, the low pressure ln the low-pressure chamber ls applled to the outer surface of the end plate of the statlonary scroll, thus preventlng or reduclng deformatlon of the end plate.
As a result, lt ls posslble to prevent abnormal frlctlon, selzure and galllng between the lnner surface of the end plate of the statlonary scroll and the tlp surface of the splral lap of the revolvlng scroll and damages of the splral lap, thus lmprovlng rellablllty of a scroll type fluld machlnery.
DETAILED DBSCRIPTION OF A ~ K~ EMBODIMFNT
A preferred embodlment of the present lnventlon wlll be descrlbed ln detall lllustratlvely hereafter wlth reference to the drawlngs.
Fig. 1 shows a first embodlment of the present lnventlon.
A low pressure chamber formlng unlt 33 18 dlsposed on the outslde of an end plate 11 of a statlonary scroll 10, and ls clamped to a cup-shaped maln body 2 together wlth the statlonary scroll 10 by means of a bolt 13. The outer perlpheral surface of the unlt 33 ls lnstalled on an lnner perlpheral surface of the cup-shaped maln body 2 through a seal rlng 35 so as to form an alrtlght structure, so that the lnslde of a houslng 1 ls partltloned lnto a low pressure chamber 32 and a hlgh pressure chamber 31 by means of the unlt 33. Further, a low pressure chamber 34 ls dellmlted between the end plate 11 of the statlonary scroll 10 and the hlgh pressure chamber 31 by means of the unlt 33, and the low pressure chamber 34 communlcates wlth the low pressure chamber 32 through a through hole 36.
A hole 37 whlch communlcates wlth a dlscharge port 29 ls bored at the central part of the unlt 33, and a tip of a cylindrical boss 38 projected toward the end plate 11 around the hole 37 is attached onto the outer surface of the end plate 11 through a seal ring 39 so as to form an airtight structure. Further, a discharge valve 30 opens and closes the outlet of the hole 37.
Other constructions are similar to 'hat of a conventional compressor shown in Fig. 3. Same symbols are assigned to corresponding members, and the descrip-tion thereof is omitted herein.
Thus, at the time of operation of a scroll type compressor, a low pressure gas suctioned into the low pressure chamber 32 enters into the low pressure chamber 34 through the through hole 36. Accordingly, the low pressure gas in the low pressure chamber 34 acts on the outer surface of the end plate 11 of the stationary scroll 10, and the pressing force applied to the end plate 11 becomes smaller substantially as compared with a conventional compressor, thereby to prevent or reduce deformation of the end plate 11.
Fig. 2 shows a second embodiment of the present invention, wherein the hole 37 is enlarged, the discharge valve 30 is disposed at the bottom of the hole 37, and the outlet of the discharge port 29 is opened and closed by means of the discharge valve 30.
In the second embodiment, the top clearance volume is reduced and performance of a compressor may be improved.
Claims (4)
1. A scroll-type fluid machinery including a housing sealed by a cup-shape main body formed with an opening at one end and a front cover assembly combined with said main body so as to close said opening, said housing containing a stationary scroll and a revolving scroll, both formed with spiral wraps set upright on end plates thereof respectively, said stationary and revolving scrolls being adapted to engage each other, said stationary scroll being fixed toward the bottom side of said housing said revolving scroll being adapted to revolve in solar motion while checking its rotation by rotation-checking means and a compressed fluid being discharged from a discharge port formed in the end plate of said stationary scroll into a high-pressure chamber formed in said housing characterized in that a low-pressure chamber forming unit is disposed outside of the end plate of said stationary scroll so as to partition the inside of said housing into a first low-pressure chamber and said high-pressure chamber and to position said high-pressure chamber toward the bottom side of said housing the outer peripheral surface of said low-pressure forming unit being caused to fit the inner peripheral surface of said cup-shape main body and a second low-pressure chamber to communicate with said first low-pressure chamber is formed between the end plate of said stationary scroll and said high-pressure chamber by means of said low-pressure chamber forming unit said low-pressure forming unit and said stationary scroll being fixedly fastened to said housing by means of bolts from outside said housing.
2. A scroll type fluid machinery according to claim 1, characterized in that a hole which communicates with a discharge port provided at a central part of the end plate of said stationary scroll at one end and opens to said high pressure chamber at another end is provided in said low pressure chamber forming unit.
3. A scroll type fluid machinery according to claim 2, characterized in that said hole provided in said low pressure chamber forming unit is opened in a large size, and a discharge valve is provided at said discharge port on the bottom of said hole.
4. A scroll type fluid machinery according to claim 1, characterized in that a seal member is interposed on the outer peripheral surface of said low pressure chamber forming unit between the outer peripheral surface and the inner peripheral surface of said housing for the purpose of partitioning the inside of said housing into a high pressure chamber and a low pressure chamber.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP216169/1990 | 1990-08-16 | ||
| JP2216169A JPH04101001A (en) | 1990-08-16 | 1990-08-16 | Scroll type fluid machine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2042204A1 CA2042204A1 (en) | 1992-02-17 |
| CA2042204C true CA2042204C (en) | 1995-05-09 |
Family
ID=16684368
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002042204A Expired - Fee Related CA2042204C (en) | 1990-08-16 | 1991-05-09 | Scroll type fluid machinery |
Country Status (6)
| Country | Link |
|---|---|
| EP (1) | EP0471425A1 (en) |
| JP (1) | JPH04101001A (en) |
| KR (1) | KR920004729A (en) |
| CN (1) | CN1021590C (en) |
| AU (1) | AU643273B2 (en) |
| CA (1) | CA2042204C (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5342185A (en) * | 1993-01-22 | 1994-08-30 | Copeland Corporation | Muffler plate for scroll machine |
| JP2000352389A (en) * | 1999-06-08 | 2000-12-19 | Mitsubishi Heavy Ind Ltd | Scroll compressor |
| KR100398472B1 (en) * | 2000-12-28 | 2003-09-19 | 라필찬 | A scroll pump with a high pressure chamber and a low pressure chamber |
| KR100427398B1 (en) * | 2000-12-28 | 2004-04-17 | 라필찬 | A scroll pump with a high pressure chamber and a low pressure chamber |
| KR100427399B1 (en) * | 2000-12-28 | 2004-04-17 | 라필찬 | A scroll pump with a high pressure chamber and a low pressure chamber |
| JP2005201114A (en) * | 2004-01-14 | 2005-07-28 | Toyota Industries Corp | Compressor |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5819875B2 (en) * | 1980-03-18 | 1983-04-20 | サンデン株式会社 | Scroll compressor |
| GB2132276B (en) * | 1982-12-23 | 1986-10-01 | Copeland Corp | Scroll-type rotary fluid-machine |
-
1990
- 1990-08-16 JP JP2216169A patent/JPH04101001A/en active Pending
-
1991
- 1991-05-09 CA CA002042204A patent/CA2042204C/en not_active Expired - Fee Related
- 1991-05-10 AU AU76453/91A patent/AU643273B2/en not_active Ceased
- 1991-06-03 CN CN91103678A patent/CN1021590C/en not_active Expired - Fee Related
- 1991-06-11 EP EP91250154A patent/EP0471425A1/en not_active Withdrawn
- 1991-08-16 KR KR1019910014114A patent/KR920004729A/en not_active Ceased
Also Published As
| Publication number | Publication date |
|---|---|
| JPH04101001A (en) | 1992-04-02 |
| KR920004729A (en) | 1992-03-28 |
| CN1021590C (en) | 1993-07-14 |
| AU643273B2 (en) | 1993-11-11 |
| CA2042204A1 (en) | 1992-02-17 |
| CN1059017A (en) | 1992-02-26 |
| EP0471425A1 (en) | 1992-02-19 |
| AU7645391A (en) | 1992-02-20 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| MKLA | Lapsed |