CA2284425A1 - Scroll-type fluid displacement apparatus - Google Patents
Scroll-type fluid displacement apparatus Download PDFInfo
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- CA2284425A1 CA2284425A1 CA 2284425 CA2284425A CA2284425A1 CA 2284425 A1 CA2284425 A1 CA 2284425A1 CA 2284425 CA2284425 CA 2284425 CA 2284425 A CA2284425 A CA 2284425A CA 2284425 A1 CA2284425 A1 CA 2284425A1
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- housing
- scroll
- scroll member
- fluid displacement
- type fluid
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- 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
- F04C27/00—Sealing arrangements in rotary-piston pumps specially adapted for elastic fluids
- F04C27/008—Sealing arrangements in rotary-piston pumps specially adapted for elastic fluids for other than working fluid, i.e. the sealing arrangements are not between working chambers of the machine
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Rotary Pumps (AREA)
- Applications Or Details Of Rotary Compressors (AREA)
Abstract
A scroll-type fluid displacement apparatus includes a housing, and first and second scroll members at an angular and radial offset for forming fluid pockets, each scroll member having a spiral element. Bolts fasten the first scroll member to the housing. A seal groove is defined on an end surface of an end surface of the housing and an end surface of the first scroll member contacting with each other in the axial direction, at a position surrounding each of the bolts. A seal member is disposed in the seal groove. The seal member may be attached at a proper position in a proper condition prior to securing the bolts, and may be maintained to be in the proper condition after fastening. Thus, leakage from the housing through the bolt portions may be prevented.
Description
SCROLL-TYPE FLUID DISPLACEMENT APPARATUS
BACKGROUND OF THE INVENTION
1. Field of the Invention The present invention relates to a scroll-type fluid displacement apparatus, such as a scroll-type compressor or a scroll-type pump.
BACKGROUND OF THE INVENTION
1. Field of the Invention The present invention relates to a scroll-type fluid displacement apparatus, such as a scroll-type compressor or a scroll-type pump.
2. Description of Related Art Scroll-type fluid displacement apparatus are known in the art. For example, as depicted in Fig. 7, a scroll-type fluid displacement apparatus 101 has therein a housing 104 having a suction chamber 145 and a discharge chamber 146. Scroll-type fluid displacement apparatus 101 has a first scroll member 105 and a second scroll member 106 within housing 104. Second scroll member 106 is disposed for nonrotatable, orbital movement relative to first scroll member 105, within the interior of housing 104. First scroll member 105 has a first end plate 151 and a first spiral element 152 which axially extends from first end plate 151. Second scroll member 106 has a second end plate 161 and a second spiral element 162 which axially extends from second end plate 161. First spiral element 152 and second spiral element 162 interfit at an angular and radial offset to make a plurality of line contacts which define at least one pair of sealed off fluid pockets.
First scroll member 105 is fixed in housing 104 by fitting first scroll member 105 into housing 104, and by fastening first scroll member 105 to housing 104 by bolts 107 extending through housing 104. In scroll-type fluid displacement apparatus 101, a circular seal groove 140 is defined on the outer surface of housing 104, which faces the head of bolt 107. A ring seal member 108, such as an O-ring or a seal washer, is disposed in seal groove 140. When first scroll member 105 is fastened to housing 104 by bolt 107, seal member 108 is compressed by the head of bolt 107, thereby sealing the portion of housing 104 through which bolt 107 extends.
In such a known structure of scroll-type fluid displacement apparatus 101, however, when bolt 107 is fastened, an O-ring used as seal member 108 may be fixed in an improper condition, such that the O-ring is nipped between the head of rotating bolt 107 and the shoulder of seal groove 140. Alternatively, a seal washer used as seal member 108 may be fixed in an improper condition, such that the seal washer is inclined by its contact with the threaded portion of bolt 107. If the O-ring or the seal washer is fixed in such an improper condition, leakage may occur through the portion of housing 104, through which bolt 107 extends.
SUMMARY OF THE INVENTION
Accordingly, it is an object of the present invention to provide an improved structure for a scroll-type fluid displacement apparatus that may prevent leakage from the housing of the apparatus.
To achieve the foregoing and other objects, a scroll-type fluid displacement apparatus according to a first embodiment of the present invention is herein provided. The scroll-type fluid displacement apparatus according to the first invention of the present invention includes a housing having therein a suction chamber and a discharge chamber, a first scroll member disposed within the housing and having a first end plate from which a first spiral element axially extends into the interior of the housing and a second scroll member disposed for nonrotatable, orbital movement relative to the first scroll member and having a second end plate from which a second spiral element axially extends into the interior of the housing. The first and second spiral elements interfit at an angular and radial offset to make a plurality of line contacts which define at least one pair of sealed off fluid pockets. A plurality of bolts extend through the housing and are threaded into the first scroll member for fastening the first scroll member to the housing. The scroll-type fluid displacement apparatus comprises a seal groove defined on at least one end surface of an end surface of the housing and an end surface of the first scroll member contacting with each other in the axial direction of the first scroll member, at least at a position surrounding each of the bolts, and a seal member disposed in the seal groove.
First scroll member 105 is fixed in housing 104 by fitting first scroll member 105 into housing 104, and by fastening first scroll member 105 to housing 104 by bolts 107 extending through housing 104. In scroll-type fluid displacement apparatus 101, a circular seal groove 140 is defined on the outer surface of housing 104, which faces the head of bolt 107. A ring seal member 108, such as an O-ring or a seal washer, is disposed in seal groove 140. When first scroll member 105 is fastened to housing 104 by bolt 107, seal member 108 is compressed by the head of bolt 107, thereby sealing the portion of housing 104 through which bolt 107 extends.
In such a known structure of scroll-type fluid displacement apparatus 101, however, when bolt 107 is fastened, an O-ring used as seal member 108 may be fixed in an improper condition, such that the O-ring is nipped between the head of rotating bolt 107 and the shoulder of seal groove 140. Alternatively, a seal washer used as seal member 108 may be fixed in an improper condition, such that the seal washer is inclined by its contact with the threaded portion of bolt 107. If the O-ring or the seal washer is fixed in such an improper condition, leakage may occur through the portion of housing 104, through which bolt 107 extends.
SUMMARY OF THE INVENTION
Accordingly, it is an object of the present invention to provide an improved structure for a scroll-type fluid displacement apparatus that may prevent leakage from the housing of the apparatus.
To achieve the foregoing and other objects, a scroll-type fluid displacement apparatus according to a first embodiment of the present invention is herein provided. The scroll-type fluid displacement apparatus according to the first invention of the present invention includes a housing having therein a suction chamber and a discharge chamber, a first scroll member disposed within the housing and having a first end plate from which a first spiral element axially extends into the interior of the housing and a second scroll member disposed for nonrotatable, orbital movement relative to the first scroll member and having a second end plate from which a second spiral element axially extends into the interior of the housing. The first and second spiral elements interfit at an angular and radial offset to make a plurality of line contacts which define at least one pair of sealed off fluid pockets. A plurality of bolts extend through the housing and are threaded into the first scroll member for fastening the first scroll member to the housing. The scroll-type fluid displacement apparatus comprises a seal groove defined on at least one end surface of an end surface of the housing and an end surface of the first scroll member contacting with each other in the axial direction of the first scroll member, at least at a position surrounding each of the bolts, and a seal member disposed in the seal groove.
The seal member may be an O-ring, a seal washer, or a gasket. When the seal member is a gasket, the seal groove may have a first groove portion defined at a position surrounding each of the bolts, and a second groove portion connecting adjacent first groove portions. The gasket may have a first gasket portion disposed in the first groove portion and a second gasket portion disposed in the second groove portion.
The scroll-type fluid displacement apparatus according to a second embodiment of the present invention includes a housing having therein a suction chamber and a discharge chamber, a first scroll member disposed within the housing and having a first end plate from which a first spiral element axially extends into the interior of the housing, and a second scroll member disposed for nonrotatable, orbital movement relative to the first scroll member within the interior of the housing and having a second end plate from which a second spiral element axially extends into the interior of the housing. The first and second spiral elements interfit at an angular and radial offset to make a plurality of line contacts which define at least one pair of sealed off fluid pockets. The scroll-type fluid displacement apparatus comprises a plurality of pins provided between the housing and the first scroll member for fixing the first scroll member to the housing by being press-fitted into the housing and the first scroll member.
A first end of each of the pins may be press-fitted into the housing and a second end of each of the pins may be press-fitted into the first scroll member in the axial direction of the first scroll member. Each of the pins may be a double-headed pin.
In the scroll-type fluid displacement apparatus according to the first embodiment of the present invention, because the seal member is disposed in the seal groove, the seal member is merely compressed between the end surface of the housing and the end surface of the first scroll member when the first scroll member is disposed within the housing at a proper position.
Therefore, the seal member is not offset from a proper position, or is not inclined, when the first scroll member is disposed within the housing. After the seal member is disposed at a proper position and the first scroll member is disposed at a proper position within the housing, the bolt is fastened to fix the first scroll member to the housing. At that time, because the seal member already has been disposed at a proper position and is maintained at the proper position, a problem of the seal member, such as offsetting the seal member from its proper position, inclination of the seal member, or injury of the seal member by fastening the bolt is avoided. Consequently, a desired sealing condition is achieved, and leakage from the bolt portion of the housing is prevented.
In the scroll-type fluid displacement apparatus according to the second embodiment of the present invention, the first scroll member is fixed to the housing by pins instead of the above-described bolts. The pins are press-fitted into both the housing and the first scroll member for fixing the first scroll member to the housing. The pins are not exposed on the outer surface of the housing. Specifically, the pins do not penetrate through the housing. Therefore, through holes for the pins are not necessary on the housing. Consequently, leakage through the wall of the housing may be prevented.
Further objects, features, and advantages of the present invention will be understood from the following detailed description of preferred embodiments of the present invention with reference to the accompanying figures.
BRIEF DESCRIPTION OF THE DRAWINGS
Embodiments of the invention now are described with reference to the accompanying figures, which are given by way of example only, and are not intended to limit the present invention.
Fig. 1 is a vertical, cross-sectional view of a scroll-type fluid displacement apparatus according to a first embodiment of the present invention.
Fig. 2 is a cross-sectional view of a first example of the scroll-type fluid displacement apparatus depicted in Fig. 1, as viewed along line A-A of Fig. 1.
Fig. 3 is a cross-sectional view of a second example of the scroll-type fluid displacement apparatus depicted in Fig. 1, as viewed along line A-A of Fig. 1.
Fig. 4 is a cross-sectional view of a third example of the scroll-type fluid displacement apparatus depicted in Fig. 1, as viewed along line A-A of Fig. 1.
Fig. 5 is a vertical, cross-sectional view of a scroll-type fluid displacement apparatus according to a second embodiment of the present invention.
Fig. 6 is a cross-sectional view of an example of the scroll-type fluid displacement apparatus depicted in Fig. 5, as viewed along line B-B of Fig. 5.
Fig. 7 is a vertical, cross-sectional view of a known scroll-type fluid displacement apparatus.
DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS
Referring to Figs. 1 and 2, a scroll-type compressor according to a first embodiment of the present invention is provided. The illustrated apparatus is designed to operate as a scroll-type compressor. Scroll-type compressor 1 includes housing 4, first scroll member 5, second scroll member 6, bolts 7 for fastening, O-rings 81 provided as a seal member, and drive shaft 11.
Housing 4 comprises a cup-like housing body 41, and a funnel-like front housing 42 closing the open end of housing body 41. Insertion holes 41a are defined on the bottom of cup-like housing body 41 for inserting bolts 7. Front housing 42 _7_ has a cylindrical boss 42a on its tip portion. An electromagnetic clutch 12 is provided on boss 42a via rotor bearing 43.
First scroll member 5 comprises first end plate 51, first spiral element 52, and leg portions 53. First end plate 51 is formed as a circular plate. First spiral element 52 is formed along an involute. First spiral element 52 is provided on one surface of first end plate 51, such that the first spiral element 52 axially extends into the interior of housing 4. Leg portions 53 are formed on the other surface of first end plate 51. In this embodiment, leg portions 53 comprise four cylindrical portions 53a, and partition wall portions 53b connecting adjacent cylindrical portions 53a. A female threads 53c are defined in each cylindrical portion 53a of leg portion 53. On the end surface of each cylindrical portion 53a in the axial direction of first scroll member 5, a ring-like seal groove 53d is defined. Seal groove 53d extends so as to surround female threads 53c and bolt 7.
A discharge port 54 is defined at the center of first end plate 51 of first scroll member 5. Discharge port 54 discharges a refrigerant gas compressed in fluid pockets 44 into a discharge chamber 46. A discharge valve 55 which opens and closes discharge port 54, and a valve retainer 56 which restricts the deflection of discharge valve 55, are fixed on first end plate 51 of first scroll member 5 by a bolt 57.
_$_ Second scroll member 6 comprises second end plate 61, second spiral element 62 and cylindrical boss 63. Second end plate 61 is formed as a circular plate. Second spiral element 62 is formed along the same involute as that of first spiral element 52. Second spiral element 62 is provided on one surface of second end plate 61, such that the second spiral element 62 axially extends into the interior of housing 4. Boss 63 is formed on the other surface of second end plate 61.
In boss 63, an eccentric bushing 65 having an eccentric hole 65a is disposed rotatably on a needle bearing 64. Second scroll member 6 is disposed for nonrotatable, orbital movement relative to first scroll member 5 within the interior of housing 4. First spiral element 52 of first scroll member 5 and second spiral element 62 of second scroll member 6 are interfitted at an angular and radial offset to make a plurality line contacts which define at least one pair of sealed off fluid pockets 44 between first spiral element 52 and second spiral element 62. A rotation preventing mechanism 13 is provided between the other surface of second scroll member 6 and the inner surface of front housing 42. Rotation preventing mechanism 13 prevents the rotation of second scroll member 6 with respect to first scroll member 5, when second scroll member 6 moves in an orbital motion at a predetermined orbital radius around a center of first scroll member 5.
Bolts 7 are inserted into insertion holes 41a formed on the _9_ bottom of cup-like housing body 41. Bolts 7 secure first scroll member 5 to housing body 41 by engaging female threads 53c defined in cylindrical portions 53a of leg portion 53 of first scroll member 5. The outer surface of first end plate 51 is fitted into the inner surface of housing body 41. A seal member 58 is interposed between the outer surface of first end plate 51 and the inner surface of housing body 41. Therefore, the interior of housing 4 is divided into two chambers by first end plate 51. A first chamber is formed from one surface of first end plate 51 to front housing 42, and a second chamber is formed from the other surface of first end plate 51 to the inner bottom surface of cup-like housing body 41. The first chamber surrounding first spiral element 52 and second spiral element 62 is formed as a suction chamber 45. The second chamber from first end plate 51 to the inner bottom surface of cup-like housing body 41 is formed as a discharge chamber 46.
A drive shaft 11 comprises a small diameter shaft portion 111, a large diameter disc-like portion 112 connected coaxially to one end of small diameter shaft portion 111, and a crank pin 113 connected to one surface of disc-like portion 112 eccentrically from the center of disc-like portion 112. Small diameter shaft portion 111 of drive shaft 11 is rotatably supported in boss 42a of front housing 42 by ball bearing 47.
Disc-like portion 112 of drive shaft 11 is rotatably supported in the second scroll member side portion of front housing 42 by ball bearing 48. The tip portion of small diameter shaft portion 111 of drive shaft 11 projects out from front housing 42.
The projecting tip portion is connected to electromagnetic clutch 12. Crank pin 113 is inserted into eccentric hole 65a of eccentric bush 65, which is rotatably disposed in boss 63 of second scroll member 6. By such a structure, drive shaft 11 is connected to second scroll member 6. When a drive force is transmitted from an external drive source, for example, an engine of a vehicle, via electromagnetic clutch 12, drive shaft 11 is rotated, and second scroll member 6 is driven at an orbital motion by the rotation of drive shaft 11.
O-ring 81 is inserted into seal groove 53d defined on the surface of leg portion 53 of first scroll member 5. 0-ring 81 seals between the end surface of leg portion 53 of first scroll member 5 and the inner bottom surface of cup-like housing body 41 of housing 4.
In the above-described compressor, bolts 7 are fastened into female threads 53c defined in cylindrical portions 53a after first scroll member 5 is disposed at a proper position in housing 4. First, 0-ring 81 is disposed in each seal groove 53d defined on each leg portion 53 of first scroll member 5. In this state, first scroll member 5 is inserted into cup-like housing body 41. First scroll member 5 is inserted in the axial direction of housing body 41, and then the end surfaces of leg portions 53 of first scroll member 5 are brought into contact with the inner bottom surface of cup-like housing body 41. During the insertion, O-ring 81 merely comes into contact with the inner bottom surface of cup-like housing body 41 in the axial direction of first scroll member 5. Therefore, 0-ring 81 remains in the proper position and does not incline within seal groove 53d. After the insertion of first scroll member 5 into housing body 41 at a proper position, bolts 7 are inserted into insertion holes 41a and screwed into female threads 53c.
By screwing bolts 7 into threads 53c first scroll member 5 is fixed securely to housing body 41. When bolt 7 are fastened to first scroll member 5, O-rings 81 already have been disposed at their respective proper positions in the respective seal grooves 53d. Therefore, when bolts 7 engage threads 53c, O-rings 81 are maintained at their proper positions, thereby achieving an excellent seal condition, such that leakage does not occur from the bolt portions of housing 4.
Although seal grooves 53d are provided on the end surfaces of leg portions 53 of first scroll member 5 in this embodiment, the seal grooves may be provided on the inner surface of housing 4, or, may be provided on both of the end surfaces of leg portions 53 and the inner surface of housing 4, so that the respective grooves face each other.
Fig. 3 depicts another example of the above-described first embodiment. In this example, a seal washer 82 is used instead of O-ring 81 as the seal member that is inserted into each seal groove 53d. Other structures are the same as those depicted in Figs. 1 and 2. Seal washer 82 acts substantially the same function as that of 0-ring 81. In such a structure, an excellent seal condition may be achieved, thereby preventing leakage from the bolt portions of housing 4.
Fig. 4 depicts a further example of the above-described first embodiment. In this example, a gasket 83 is used instead of O-ring 81 as the seal member that is inserted into each seal groove 53d. Seal groove 53d comprises first groove portions 53d1 defined at a position on the end surface of each leg portion 53a surrounding each bolt 7, and second groove portions 53d2 defined on the end surface of each partition wall portion 53b and connecting adjacent first groove portions 53d1. In correspondence with this groove structure, gasket 83 has a first gasket portion 83a disposed in each first groove portion 53d1, and a second gasket portion 83b disposed in each second groove portion 53d1. Gasket 83 may be integrally formed as a single part. In such a structure, an excellent seal condition may be achieved, thereby preventing leakage from the bolt portions of housing 4. Moreover, because gasket 83, which is provided as the seal member, may be formed as a single part, the handling and assembly thereof may be facilitated. Other structures in this embodiment are the same as those depicted in Figs. 1 and 2.
Figs. 5 and 6 depict a scroll-type fluid displacement apparatus according to a second embodiment of the present invention. The illustrated apparatus also is designed to operate as a scroll-type compressor. In compressor 201 of this embodiment, first scroll member 25 is fixed to housing body 241 of housing 24 by means of pins 9 instead of bolt 7. Each pin 9 is formed as a double-headed pin in this embodiment. Pin insertion holes 49 are formed on the inner bottom surface of housing body 241. Corresponding pin insertion holes 53e are defined on the respective end surfaces of leg portions 53 of first scroll member 25. A first end of each pin 9 is press-fitted into each pin insertion hole 49, and a second end of each pin 9 is press-fitted into each corresponding pin insertion hole 53e, in the axial direction of first scroll member 25.
Other structures of this embodiment are the same as those of the first embodiment.
In such a compressor according to the second embodiment, there is no through hole for inserting bolts 7, and it is not necessary to provide seal members for the bolt portions in housing 24. Therefore, no problems are encountered with respect to improper setting of seal members or with respect to leakage accompanying the improper setting of seal members.
Although double pins 9 are used in this embodiment, other types of pins, such as cylindrical pins or triangular pins, may be employed. Further, although pins 9 are set to extend in the axial direction of first scroll member 25 in this embodiment, another direction also may be applied, as long as the pin insertion holes of housing 24 are not penetrated.
Although the first and second embodiments have been described with respect to a scroll-type compressor, the present invention may similarly be applied to other scroll-type fluid displacement apparatuses, such as a scroll-type pump.
Although several embodiments of the present invention have been described in detail herein, the scope of the invention is not limited thereto. It will be appreciated by those skilled in the art that various modifications may be made without departing from the scope of the invention. Accordingly, the embodiments disclosed herein are only exemplary. It is to be understood that the scope of the invention is not to be limited thereby, but is to be determined by the claims which follow.
The scroll-type fluid displacement apparatus according to a second embodiment of the present invention includes a housing having therein a suction chamber and a discharge chamber, a first scroll member disposed within the housing and having a first end plate from which a first spiral element axially extends into the interior of the housing, and a second scroll member disposed for nonrotatable, orbital movement relative to the first scroll member within the interior of the housing and having a second end plate from which a second spiral element axially extends into the interior of the housing. The first and second spiral elements interfit at an angular and radial offset to make a plurality of line contacts which define at least one pair of sealed off fluid pockets. The scroll-type fluid displacement apparatus comprises a plurality of pins provided between the housing and the first scroll member for fixing the first scroll member to the housing by being press-fitted into the housing and the first scroll member.
A first end of each of the pins may be press-fitted into the housing and a second end of each of the pins may be press-fitted into the first scroll member in the axial direction of the first scroll member. Each of the pins may be a double-headed pin.
In the scroll-type fluid displacement apparatus according to the first embodiment of the present invention, because the seal member is disposed in the seal groove, the seal member is merely compressed between the end surface of the housing and the end surface of the first scroll member when the first scroll member is disposed within the housing at a proper position.
Therefore, the seal member is not offset from a proper position, or is not inclined, when the first scroll member is disposed within the housing. After the seal member is disposed at a proper position and the first scroll member is disposed at a proper position within the housing, the bolt is fastened to fix the first scroll member to the housing. At that time, because the seal member already has been disposed at a proper position and is maintained at the proper position, a problem of the seal member, such as offsetting the seal member from its proper position, inclination of the seal member, or injury of the seal member by fastening the bolt is avoided. Consequently, a desired sealing condition is achieved, and leakage from the bolt portion of the housing is prevented.
In the scroll-type fluid displacement apparatus according to the second embodiment of the present invention, the first scroll member is fixed to the housing by pins instead of the above-described bolts. The pins are press-fitted into both the housing and the first scroll member for fixing the first scroll member to the housing. The pins are not exposed on the outer surface of the housing. Specifically, the pins do not penetrate through the housing. Therefore, through holes for the pins are not necessary on the housing. Consequently, leakage through the wall of the housing may be prevented.
Further objects, features, and advantages of the present invention will be understood from the following detailed description of preferred embodiments of the present invention with reference to the accompanying figures.
BRIEF DESCRIPTION OF THE DRAWINGS
Embodiments of the invention now are described with reference to the accompanying figures, which are given by way of example only, and are not intended to limit the present invention.
Fig. 1 is a vertical, cross-sectional view of a scroll-type fluid displacement apparatus according to a first embodiment of the present invention.
Fig. 2 is a cross-sectional view of a first example of the scroll-type fluid displacement apparatus depicted in Fig. 1, as viewed along line A-A of Fig. 1.
Fig. 3 is a cross-sectional view of a second example of the scroll-type fluid displacement apparatus depicted in Fig. 1, as viewed along line A-A of Fig. 1.
Fig. 4 is a cross-sectional view of a third example of the scroll-type fluid displacement apparatus depicted in Fig. 1, as viewed along line A-A of Fig. 1.
Fig. 5 is a vertical, cross-sectional view of a scroll-type fluid displacement apparatus according to a second embodiment of the present invention.
Fig. 6 is a cross-sectional view of an example of the scroll-type fluid displacement apparatus depicted in Fig. 5, as viewed along line B-B of Fig. 5.
Fig. 7 is a vertical, cross-sectional view of a known scroll-type fluid displacement apparatus.
DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS
Referring to Figs. 1 and 2, a scroll-type compressor according to a first embodiment of the present invention is provided. The illustrated apparatus is designed to operate as a scroll-type compressor. Scroll-type compressor 1 includes housing 4, first scroll member 5, second scroll member 6, bolts 7 for fastening, O-rings 81 provided as a seal member, and drive shaft 11.
Housing 4 comprises a cup-like housing body 41, and a funnel-like front housing 42 closing the open end of housing body 41. Insertion holes 41a are defined on the bottom of cup-like housing body 41 for inserting bolts 7. Front housing 42 _7_ has a cylindrical boss 42a on its tip portion. An electromagnetic clutch 12 is provided on boss 42a via rotor bearing 43.
First scroll member 5 comprises first end plate 51, first spiral element 52, and leg portions 53. First end plate 51 is formed as a circular plate. First spiral element 52 is formed along an involute. First spiral element 52 is provided on one surface of first end plate 51, such that the first spiral element 52 axially extends into the interior of housing 4. Leg portions 53 are formed on the other surface of first end plate 51. In this embodiment, leg portions 53 comprise four cylindrical portions 53a, and partition wall portions 53b connecting adjacent cylindrical portions 53a. A female threads 53c are defined in each cylindrical portion 53a of leg portion 53. On the end surface of each cylindrical portion 53a in the axial direction of first scroll member 5, a ring-like seal groove 53d is defined. Seal groove 53d extends so as to surround female threads 53c and bolt 7.
A discharge port 54 is defined at the center of first end plate 51 of first scroll member 5. Discharge port 54 discharges a refrigerant gas compressed in fluid pockets 44 into a discharge chamber 46. A discharge valve 55 which opens and closes discharge port 54, and a valve retainer 56 which restricts the deflection of discharge valve 55, are fixed on first end plate 51 of first scroll member 5 by a bolt 57.
_$_ Second scroll member 6 comprises second end plate 61, second spiral element 62 and cylindrical boss 63. Second end plate 61 is formed as a circular plate. Second spiral element 62 is formed along the same involute as that of first spiral element 52. Second spiral element 62 is provided on one surface of second end plate 61, such that the second spiral element 62 axially extends into the interior of housing 4. Boss 63 is formed on the other surface of second end plate 61.
In boss 63, an eccentric bushing 65 having an eccentric hole 65a is disposed rotatably on a needle bearing 64. Second scroll member 6 is disposed for nonrotatable, orbital movement relative to first scroll member 5 within the interior of housing 4. First spiral element 52 of first scroll member 5 and second spiral element 62 of second scroll member 6 are interfitted at an angular and radial offset to make a plurality line contacts which define at least one pair of sealed off fluid pockets 44 between first spiral element 52 and second spiral element 62. A rotation preventing mechanism 13 is provided between the other surface of second scroll member 6 and the inner surface of front housing 42. Rotation preventing mechanism 13 prevents the rotation of second scroll member 6 with respect to first scroll member 5, when second scroll member 6 moves in an orbital motion at a predetermined orbital radius around a center of first scroll member 5.
Bolts 7 are inserted into insertion holes 41a formed on the _9_ bottom of cup-like housing body 41. Bolts 7 secure first scroll member 5 to housing body 41 by engaging female threads 53c defined in cylindrical portions 53a of leg portion 53 of first scroll member 5. The outer surface of first end plate 51 is fitted into the inner surface of housing body 41. A seal member 58 is interposed between the outer surface of first end plate 51 and the inner surface of housing body 41. Therefore, the interior of housing 4 is divided into two chambers by first end plate 51. A first chamber is formed from one surface of first end plate 51 to front housing 42, and a second chamber is formed from the other surface of first end plate 51 to the inner bottom surface of cup-like housing body 41. The first chamber surrounding first spiral element 52 and second spiral element 62 is formed as a suction chamber 45. The second chamber from first end plate 51 to the inner bottom surface of cup-like housing body 41 is formed as a discharge chamber 46.
A drive shaft 11 comprises a small diameter shaft portion 111, a large diameter disc-like portion 112 connected coaxially to one end of small diameter shaft portion 111, and a crank pin 113 connected to one surface of disc-like portion 112 eccentrically from the center of disc-like portion 112. Small diameter shaft portion 111 of drive shaft 11 is rotatably supported in boss 42a of front housing 42 by ball bearing 47.
Disc-like portion 112 of drive shaft 11 is rotatably supported in the second scroll member side portion of front housing 42 by ball bearing 48. The tip portion of small diameter shaft portion 111 of drive shaft 11 projects out from front housing 42.
The projecting tip portion is connected to electromagnetic clutch 12. Crank pin 113 is inserted into eccentric hole 65a of eccentric bush 65, which is rotatably disposed in boss 63 of second scroll member 6. By such a structure, drive shaft 11 is connected to second scroll member 6. When a drive force is transmitted from an external drive source, for example, an engine of a vehicle, via electromagnetic clutch 12, drive shaft 11 is rotated, and second scroll member 6 is driven at an orbital motion by the rotation of drive shaft 11.
O-ring 81 is inserted into seal groove 53d defined on the surface of leg portion 53 of first scroll member 5. 0-ring 81 seals between the end surface of leg portion 53 of first scroll member 5 and the inner bottom surface of cup-like housing body 41 of housing 4.
In the above-described compressor, bolts 7 are fastened into female threads 53c defined in cylindrical portions 53a after first scroll member 5 is disposed at a proper position in housing 4. First, 0-ring 81 is disposed in each seal groove 53d defined on each leg portion 53 of first scroll member 5. In this state, first scroll member 5 is inserted into cup-like housing body 41. First scroll member 5 is inserted in the axial direction of housing body 41, and then the end surfaces of leg portions 53 of first scroll member 5 are brought into contact with the inner bottom surface of cup-like housing body 41. During the insertion, O-ring 81 merely comes into contact with the inner bottom surface of cup-like housing body 41 in the axial direction of first scroll member 5. Therefore, 0-ring 81 remains in the proper position and does not incline within seal groove 53d. After the insertion of first scroll member 5 into housing body 41 at a proper position, bolts 7 are inserted into insertion holes 41a and screwed into female threads 53c.
By screwing bolts 7 into threads 53c first scroll member 5 is fixed securely to housing body 41. When bolt 7 are fastened to first scroll member 5, O-rings 81 already have been disposed at their respective proper positions in the respective seal grooves 53d. Therefore, when bolts 7 engage threads 53c, O-rings 81 are maintained at their proper positions, thereby achieving an excellent seal condition, such that leakage does not occur from the bolt portions of housing 4.
Although seal grooves 53d are provided on the end surfaces of leg portions 53 of first scroll member 5 in this embodiment, the seal grooves may be provided on the inner surface of housing 4, or, may be provided on both of the end surfaces of leg portions 53 and the inner surface of housing 4, so that the respective grooves face each other.
Fig. 3 depicts another example of the above-described first embodiment. In this example, a seal washer 82 is used instead of O-ring 81 as the seal member that is inserted into each seal groove 53d. Other structures are the same as those depicted in Figs. 1 and 2. Seal washer 82 acts substantially the same function as that of 0-ring 81. In such a structure, an excellent seal condition may be achieved, thereby preventing leakage from the bolt portions of housing 4.
Fig. 4 depicts a further example of the above-described first embodiment. In this example, a gasket 83 is used instead of O-ring 81 as the seal member that is inserted into each seal groove 53d. Seal groove 53d comprises first groove portions 53d1 defined at a position on the end surface of each leg portion 53a surrounding each bolt 7, and second groove portions 53d2 defined on the end surface of each partition wall portion 53b and connecting adjacent first groove portions 53d1. In correspondence with this groove structure, gasket 83 has a first gasket portion 83a disposed in each first groove portion 53d1, and a second gasket portion 83b disposed in each second groove portion 53d1. Gasket 83 may be integrally formed as a single part. In such a structure, an excellent seal condition may be achieved, thereby preventing leakage from the bolt portions of housing 4. Moreover, because gasket 83, which is provided as the seal member, may be formed as a single part, the handling and assembly thereof may be facilitated. Other structures in this embodiment are the same as those depicted in Figs. 1 and 2.
Figs. 5 and 6 depict a scroll-type fluid displacement apparatus according to a second embodiment of the present invention. The illustrated apparatus also is designed to operate as a scroll-type compressor. In compressor 201 of this embodiment, first scroll member 25 is fixed to housing body 241 of housing 24 by means of pins 9 instead of bolt 7. Each pin 9 is formed as a double-headed pin in this embodiment. Pin insertion holes 49 are formed on the inner bottom surface of housing body 241. Corresponding pin insertion holes 53e are defined on the respective end surfaces of leg portions 53 of first scroll member 25. A first end of each pin 9 is press-fitted into each pin insertion hole 49, and a second end of each pin 9 is press-fitted into each corresponding pin insertion hole 53e, in the axial direction of first scroll member 25.
Other structures of this embodiment are the same as those of the first embodiment.
In such a compressor according to the second embodiment, there is no through hole for inserting bolts 7, and it is not necessary to provide seal members for the bolt portions in housing 24. Therefore, no problems are encountered with respect to improper setting of seal members or with respect to leakage accompanying the improper setting of seal members.
Although double pins 9 are used in this embodiment, other types of pins, such as cylindrical pins or triangular pins, may be employed. Further, although pins 9 are set to extend in the axial direction of first scroll member 25 in this embodiment, another direction also may be applied, as long as the pin insertion holes of housing 24 are not penetrated.
Although the first and second embodiments have been described with respect to a scroll-type compressor, the present invention may similarly be applied to other scroll-type fluid displacement apparatuses, such as a scroll-type pump.
Although several embodiments of the present invention have been described in detail herein, the scope of the invention is not limited thereto. It will be appreciated by those skilled in the art that various modifications may be made without departing from the scope of the invention. Accordingly, the embodiments disclosed herein are only exemplary. It is to be understood that the scope of the invention is not to be limited thereby, but is to be determined by the claims which follow.
Claims (8)
1. A scroll-type fluid displacement apparatus including a housing having therein a suction chamber and a discharge chamber, a first scroll member disposed within said housing and having a first end plate from which a first spiral element axially extends into an interior of said housing, a second scroll member disposed for nonrotatable, orbital movement relative to said first scroll member within the interior of said housing and having a second end plate from which a second spiral element axially extends into the interior of said housing, said first and second spiral elements interfitting at an angular and radial offset to make a plurality of line contacts which define at least one pair of sealed off fluid pockets, and a plurality of bolts extending through said housing and engaging said first scroll member for fastening said first scroll member to said housing, said scroll-type fluid displacement apparatus comprising:
a seal groove formed on at least one end surface of an end surface of said housing and an end surface of said first scroll member contacting with each other in the axial direction of said first scroll member, at least at a position surrounding each of said bolts; and a seal member disposed in said seal groove.
a seal groove formed on at least one end surface of an end surface of said housing and an end surface of said first scroll member contacting with each other in the axial direction of said first scroll member, at least at a position surrounding each of said bolts; and a seal member disposed in said seal groove.
2. The scroll-type fluid displacement apparatus of claim 1, wherein said seal member is an O-ring.
3. The scroll-type fluid displacement apparatus of claim 1, wherein said seal member is a seal washer.
4. The scroll-type fluid displacement apparatus of claim 1, wherein said seal member is a gasket.
5. The scroll-type fluid displacement apparatus of claim 4, wherein said seal groove has a first groove portion formed at a position surrounding each of said bolts and a second groove portion connecting adjacent first groove portions, and said gasket has a first gasket portion disposed in said first groove portion and a second gasket portion disposed in said second groove portion.
6. A scroll-type fluid displacement apparatus including a housing having therein a suction chamber and a discharge chamber, a first scroll member disposed within said housing and having a first end plate from which a first spiral element axially extends into the interior of said housing, and a second scroll member disposed for nonrotatable orbital movement relative to said first scroll member within the interior of said housing and having a second end plate from which a second spiral element axially extends into the interior of said housing, said first and second spiral elements interfitting at an angular and radial offset to make a plurality of line contacts which define at least one pair of sealed off fluid pockets, said scroll-type fluid displacement apparatus comprising:
a plurality of pins provided between said housing and said first scroll member for fixing said first scroll member to said housing, wherein said pins are press-fitted into said housing and said first scroll member.
a plurality of pins provided between said housing and said first scroll member for fixing said first scroll member to said housing, wherein said pins are press-fitted into said housing and said first scroll member.
7. The scroll-type fluid displacement apparatus of claim 6, wherein a first end of each of said pins is press-fitted into said housing and a second end of each of said pins is press-fitted into said first scroll member in the axial direction of said first scroll member.
8. The scroll-type fluid displacement apparatus of claim 6, wherein each of said pins is a double-headed pin.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JPHEI-10-280242 | 1998-10-01 | ||
| JP10280242A JP2000110743A (en) | 1998-10-01 | 1998-10-01 | Scroll-type fluid machine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2284425A1 true CA2284425A1 (en) | 2000-04-01 |
Family
ID=17622287
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2284425 Abandoned CA2284425A1 (en) | 1998-10-01 | 1999-09-30 | Scroll-type fluid displacement apparatus |
Country Status (5)
| Country | Link |
|---|---|
| JP (1) | JP2000110743A (en) |
| CN (1) | CN1251410A (en) |
| CA (1) | CA2284425A1 (en) |
| DE (1) | DE19947132A1 (en) |
| FR (1) | FR2784145B1 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4246826B2 (en) * | 1998-12-14 | 2009-04-02 | サンデン株式会社 | Scroll compressor |
| JP6098265B2 (en) * | 2013-03-21 | 2017-03-22 | 株式会社豊田自動織機 | Compressor |
| CN103671107A (en) * | 2013-12-25 | 2014-03-26 | 江苏晨宇车业有限公司 | Novel scroll compressor for vehicle air conditioner and manufacturing method of scroll compressor |
| CN110206728B (en) * | 2019-05-14 | 2020-11-24 | 珠海格力节能环保制冷技术研究中心有限公司 | Scroll compressor and air conditioner |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5855359B2 (en) * | 1980-05-07 | 1983-12-09 | サンデン株式会社 | Scroll compressor |
| JPS5915691A (en) * | 1982-07-15 | 1984-01-26 | Sanden Corp | Scroll type fluid machine |
| US4538975A (en) * | 1983-08-16 | 1985-09-03 | Sanden Corporation | Scroll type compressor with lubricating system |
| CA2043569C (en) * | 1990-09-03 | 1995-05-09 | Yoshiyasu Ito | Scroll type fluid machinery and assembling method of the same |
| US5286180A (en) * | 1992-05-11 | 1994-02-15 | Ford Motor Company | Method for attaching fixed scroll to rear head of scroll compressor |
-
1998
- 1998-10-01 JP JP10280242A patent/JP2000110743A/en active Pending
-
1999
- 1999-09-30 CN CN 99125152 patent/CN1251410A/en active Pending
- 1999-09-30 CA CA 2284425 patent/CA2284425A1/en not_active Abandoned
- 1999-09-30 DE DE1999147132 patent/DE19947132A1/en not_active Ceased
- 1999-09-30 FR FR9912238A patent/FR2784145B1/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| FR2784145B1 (en) | 2006-02-10 |
| DE19947132A1 (en) | 2000-04-06 |
| CN1251410A (en) | 2000-04-26 |
| JP2000110743A (en) | 2000-04-18 |
| FR2784145A1 (en) | 2000-04-07 |
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| EEER | Examination request | ||
| FZDE | Dead |