US20060147330A1 - Gasket for compressor - Google Patents
Gasket for compressor Download PDFInfo
- Publication number
- US20060147330A1 US20060147330A1 US10/540,578 US54057805A US2006147330A1 US 20060147330 A1 US20060147330 A1 US 20060147330A1 US 54057805 A US54057805 A US 54057805A US 2006147330 A1 US2006147330 A1 US 2006147330A1
- Authority
- US
- United States
- Prior art keywords
- gasket
- compressor
- compressor according
- force
- fed
- 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.)
- Abandoned
Links
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B27/00—Multi-cylinder pumps specially adapted for elastic fluids and characterised by number or arrangement of cylinders
- F04B27/08—Multi-cylinder pumps specially adapted for elastic fluids and characterised by number or arrangement of cylinders having cylinders coaxial with, or parallel or inclined to, main shaft axis
- F04B27/10—Multi-cylinder pumps specially adapted for elastic fluids and characterised by number or arrangement of cylinders having cylinders coaxial with, or parallel or inclined to, main shaft axis having stationary cylinders
- F04B27/1009—Distribution members
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B27/00—Multi-cylinder pumps specially adapted for elastic fluids and characterised by number or arrangement of cylinders
- F04B27/08—Multi-cylinder pumps specially adapted for elastic fluids and characterised by number or arrangement of cylinders having cylinders coaxial with, or parallel or inclined to, main shaft axis
- F04B27/10—Multi-cylinder pumps specially adapted for elastic fluids and characterised by number or arrangement of cylinders having cylinders coaxial with, or parallel or inclined to, main shaft axis having stationary cylinders
- F04B27/1036—Component parts, details, e.g. sealings, lubrication
- F04B27/1081—Casings, housings
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
- F04B39/12—Casings; Cylinders; Cylinder heads; Fluid connections
- F04B39/125—Cylinder heads
Definitions
- the present invention relates to a gasket used in a compressor and more specifically, it relates to a structure that achieves both an improvement in the sealability and miniaturization of the compressor.
- a compressor used as an element constituting part of a refrigerating cycle includes a gasket so as to prevent leakage of compressed coolant through areas where the housing is connected and the like.
- gaskets include one in which ring-like beads are formed each surrounding one of the cylinders (see Japanese Unexamined Patent Publication No. H11-343974). These ring-like beads with their sections rising in a U-shape increase the force with which a gasket comes in contact with the areas around the cylinders and, as a result, leakage of the high-pressure coolant inside the cylinder to the outside can be prevented more effectively.
- beads are each made to curve over the entire width of a sealing portion (see Japanese Unexamined Patent Publication No. H10-196535. This structure is supposed to ensure that the beads are still allowed to become deformed readily even when the gasket has a large wall thickness.
- the invention disclosed in Japanese Unexamined Patent Publication No. H11-343974 has a problem in that since the levels of pressure required to deform the beads (full beads) with the U-shaped section is relatively high, the desired effect cannot be achieved with ease in conjunction with a gasket with a significant wall thickness. For instance, if the gasket is also to function as a retainer for regulating the movement of a discharge valve, the wall thickness of the gasket needs to be increased to ensure a higher level of gasket strength. For this reason, it is difficult to provide a gasket with a retainer function in conjunction with the full beads, and the difficulty becomes more pronounced in a CO 2 cycle in which the discharge pressure reaches approximately 10 MPa.
- an object of the present invention is to provide a gasket used in a compressor, which contributes to both an improvement of the sealability and miniaturization of the compressor.
- the present invention provides a gasket for a compressor used in a compressor in which a fluid is force-fed, having a raised portion that rises so as to surround a sealed portion and characterized in that the end of the raised portion on the inner edge side and a base surface of the gasket are not positioned on a single plane.
- the raised portion according to the present invention can be referred to as a “half bead” as opposed to the “full bead” with the U-shaped section disclosed in patent reference literature 1 mentioned earlier.
- the full bead in the related art rises from its base surface to the vertex of the U-shape and then makes a U-turn to the point the height of which is the same as the height of the base surface so as to set the end of the bead on the inner edge side substantially to the height of the base surface
- the half bead according to the present invention has an end thereof at a point arising from the base surface to a predetermined height and thus at least part of the U-turn portion ranging from the vertex to the base surface in the related art is not included in the half bead.
- the raised portion is allowed to contact at high pressure the area around the sealed portion such as a cylinder to assure high sealability. Furthermore, since the raised portion does not have the U-turn portion, the entire width of the gasket can be reduced to realize overall miniaturization of the compressor. In addition, since a desirable level of flexure is retained at the raised portion assuming the structure described above, the raised portion can be deformed readily even when the gasket has a large wall thickness.
- the raised portion be constituted with a flat surface positioned at a height different from the height of the base surface and an inclined surface linking the flat surface and the base surface with a predetermined angle of inclination.
- the raised portion assumes a gently sloping shape or the shape of a shallow bowl.
- the inclined surface With such a gasket clamped at a specific position, the inclined surface becomes compressed and deformed to assume a flat shape which, in turn, causes the area where the inclined surface links with the base surface and the area where the inclined surface links with the flat surface to press against the sealed portion with a significant force, thereby assuring a high level of sealability.
- the angle of inclination of the inclined surface should be adjusted as necessary in correspondence to the required level of sealability, the inclined surface should not be inclined at a right angle since the inclined surface needs to become deformed into a flat shape.
- the inner edge of the flat surface of the raised portion surrounding a cylinder formed at the cylinder block should not form a circle.
- the raised portion should assume a noncircular shape according to the present invention as described above, mainly in consideration of the shape of the intake valve.
- the outer edge of the flat surface should not assume a shape similar to the shape of the inner edge of the flat surface. It is desirable that the outer edge of the flat surface be in contact with the intake valve in its entirety and that only a specific portion of the inner edge of the flat surface be in contact with the intake valve.
- the specific portion ideally is an area corresponding to a connecting base at which the lead portion of the intake valve is connected.
- a raised portion should be disposed at least at a location at which a high/low pressure barrier wall is sealed and a location at which an atmospheric pressure barrier wall is sealed.
- the high/low pressure barrier wall separates a discharge chamber and an intake chamber both defined within the cylinder head from each other, whereas the atmospheric pressure barrier wall separates the inner space of the housing from the outside.
- a high level of sealability must be assured at the high/low pressure barrier wall and the atmospheric pressure barrier wall each separating two spaces with greatly differing pressures.
- the full advantage of the raised portion can be yielded by forming the inclined surface so as to set it in contact with the high/low pressure barrier wall or the atmospheric pressure barrier wall.
- the gasket include a retainer portion for regulating the operation of a discharge valve.
- a discharge valve is normally disposed adjacent to the gasket between the valve plate and the cylinder head, and the gasket having a retainer function will help reduce the number of required parts and simplify the structure.
- the gasket for a compressor according to the present invention sustains a desirable level of flexure at the raised portion and is thus fully functional even when the wall thickness is increased to assure the retainer function.
- the gasket for a compressor according to the present invention assuring a high level of sealability and contributing to miniaturization is particularly ideal in applications in compressors used to force feed carbon dioxide under high-pressure conditions, the miniaturization of which is eagerly sought after.
- FIG. 1 is a sectional view of the structure of a compressor achieved in an embodiment of the present invention
- FIG. 2 is an enlarged sectional view of the structure of the member clamped between the cylinder block and the rear head (cylinder head);
- FIG. 3 is a perspective of a structural example that may be adopted in the intake valve-side gasket in the embodiment
- FIG. 4 presents an enlarged top view and sectional view both showing the structure of a raised portion in the intake valve-side gasket
- FIG. 5 is a top view showing the relationship between the raised portion in the intake valve-side gasket and the intake valve in a partial enlargement
- FIG. 6 is a sectional view illustrating the advantage realized with the raised portion in the gasket according to the present invention in a partial enlargement
- FIG. 7 is a sectional view showing the structure adopted in the discharge valve-side gasket in the embodiment in a partial enlargement
- FIG. 8 presents a structural example that may be adopted in the rear head (cylinder head) in the embodiment in a top view illustrating the structures of the high/low pressure barrier wall and the atmospheric pressure barrier wall;
- FIG. 9 ( a ) is a sectional view taken at a 90° angle relative to the line A-A′ in FIG. 7 , showing the structure adopted in the area around the retainer portion in the embodiment in a partial enlargement and FIG. 9 ( b ) illustrates the retainer effect achieved in the embodiment.
- a compressor 1 in FIG. 1 which constitutes part of a supercritical vapor compressing refrigerating cycle (CO 2 cycle) in which carbon dioxide is used as the coolant, comprises a cylinder block 2 , a front-side cylinder head (hereafter referred to as the front-head) 3 , a rear-side cylinder head (hereafter referred to as the rear head) 4 , a valve plate 5 , intake valves 6 , discharge valves 7 , an intake valve-side gasket 10 , a discharge valve-side gasket 11 , a drive shaft 14 , a swash plate mechanism 15 , pistons 16 , pins 20 , 21 and the like.
- CO 2 cycle supercritical vapor compressing refrigerating cycle
- a plurality of cylinders 25 are formed at the cylinder block 2 , with a piston 16 slidably inserted at each cylinder 25 .
- an intake valve regulating portion 29 is formed, which regulates the opening operation of the intake valve 6 .
- an intake chamber 27 and a discharge chamber 28 are defined so as to face opposite each cylinder 25 .
- a hollow crank case 30 is defined, with the swash plate mechanism 15 which includes a swash plate 32 and an angle-adjusting the mechanism 33 disposed inside the crank case 30 .
- the drive shaft 14 is rotatably held by bearings and the like formed at the front head 3 and the cylinder block 2 and is linked to the swash plate mechanism 15 so as to communicate a drive force to the swash plate mechanism 15 .
- the intake valve-side gasket 10 , the intake valve 6 , the valve plate 5 , the discharge valve 7 and the discharge valve-side gasket 11 are clamped between the cylinder block 2 and the rear head 4 .
- the intake valve-side gasket 10 which is disposed between the cylinder block 2 and the intake valve 6 (the valve plate 5 ), includes a base surface 30 , raised portions 35 and through holes 42 , as shown in FIGS. 2 through 4 .
- FIG. 3 shows an example of a structure that may be adopted in an intake valve-side gasket 10 used in a compressor 1 having seven cylinders 25 , with the raised portions 35 formed at specific positions so as to surround each cylinder 25 .
- the raised portions 35 each include a flat surface 40 and an inclined surface 41 , with the flat surface 40 set at the position raised from the base surface 30 by a predetermined extent and ranging substantially parallel to the base surface 30 .
- the inclined surface 41 achieving a specific angle of inclination links the flat surface 40 and the base surface 30 . Consequently, an end 43 of the flat surface 40 and the base surface 30 are set at positions with differing heights.
- an inner edge 44 of the flat surface 40 does not assume a circular shape and an outer edge 45 of the flat surface 40 does not have a shape similar to that of the inner edge 44 at the raised portion 35 in the intake valve-side gasket 10 , as shown in FIG. 4 , due to consideration for the shape of the intake valve 6 shown in FIG. 5 .
- FIG. 6 shows a raised portion 35 in the intake valve-side gasket 10 clamped between the cylinder block 2 and an intake valve 6 .
- the rear side of the base surface 30 comes in contact with the cylinder block 2 and the flat surface 40 comes in contact with the intake valve 6 so as to flatten the inclined surface 41 .
- a linking area 50 where the base surface 30 and the inclined surface 41 link with each other and a linking area 51 where the flat surface 40 and the inclined surface 41 link with each other become pressed with a significant force, thereby achieving a high level of sealability.
- the raised portion 35 according to the present invention does not have a U-turn portion ranging from the vertex of the U-shape to the base surface present in the bead (full bead) with the U-shaped section in the related art, the absence of the U-turn portion allows the overall width of the gasket to be reduced.
- full beads with, for instance, a width of 4 mm in the related art can be replaced with half beads with a width of 2 mm to reduce the external diameter of the compressor by 4 mm.
- a desirable level of flexure is sustained at the raised portions 35 according to the present invention, which allows the present invention to be adopted in an ideal manner even when the gasket has a significant wall thickness.
- the discharge valve-side gasket 11 disposed between the valve plate 5 (a discharge valve 7 ) and the rear head 4 includes raised portions 60 and a retainer portion 65 as shown in FIGS. 2 and 7 .
- the raised portions 60 each include a flat surface 61 and an inclined surface 62 , and the raised portions 60 are disposed at a position facing opposite a high/low pressure barrier wall 70 separating an intake chamber 27 from the corresponding discharge chamber 28 formed in the rear head 4 and an atmospheric pressure barrier wall 71 separating the space inside the discharge chamber 28 from the outside of the housing (the atmosphere) with the inclined surfaces 62 made to come in contact with the barrier walls 70 and 71 .
- FIG. 8 shows an example of a structure that may be adopted in the rear head 3 (the high/low pressure barrier wall 70 and the atmospheric pressure barrier wall 71 ) used in conjunction with a compressor 1 having seven cylinders 25 .
- the raised portions 60 are disposed so as to surround the intake chambers 27 and discharge chambers 28 along the barrier walls 70 and 71 .
- the flat surfaces 61 and the inclined surfaces 62 basically adopt shape characteristics and functions identical to those of the flat surfaces 40 and the inclined surfaces 41 at the raised portions 35 in the intake valve-side gasket 6 described earlier, the inner edges of the flat surfaces 61 , unlike the inner edges of the flat surfaces 40 , do not need to assume a noncircular shape or the inner edges and the outer edges of the flat surfaces 61 do not need to be asymmetrical with respect to each other, as long as the flat surfaces 61 and inclined surfaces 62 achieve shapes matching those of the barrier walls 70 and 71 .
- the retainer portions 65 provided to regulate the valve opening operation of the discharge valves 7 are each formed by raising the discharge valve-side gasket 11 toward the discharge chamber 28 , as shown in FIGS. 2 and 9 ( a ).
- a retainer hold 72 is formed inside the discharge chambers 28 at the rear head 4 .
- the retainer holds 72 are each formed so as to press against an area corresponding to a connecting base 75 of a lead portion 74 of the discharge valve 7 .
- the presence of the retainer holds 65 in the discharge valve-side gasket 11 contributes to a reduction in the number of required parts and further structural simplification. Furthermore, since a desired level of flexure is assured at the raised portions 60 in the gasket according to the present invention, the present invention can be adopted in an ideal manner even when the gasket has a large wall thickness in order to assure its retaining function.
- the gasket for a compressor according to the present invention is not limited to this example and all of or some of the raised portions 35 and 60 may be formed so as to rise toward the sides opposite from those in the structure described above. Namely, the raised portions 35 at the intake valve-side gasket 10 may rise toward the cylinder block 2 and the raised portion 60 at the discharge valve-side gasket 11 may rise toward the discharge valve 7 (valve plate).
- the present invention with the raised portions surrounding sealed portions formed as described above, a high level of sealability is assured and the compressor can be realized as a compact unit.
- the gasket has a larger wall thickness in order to achieve a retainer function at the gasket, a desirable level of flexure is still maintained at the raised portions and thus, the present invention can be adopted in an ideal manner even when the gasket has a significant wall thickness.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Compressor (AREA)
- Compressors, Vaccum Pumps And Other Relevant Systems (AREA)
- Gasket Seals (AREA)
Abstract
A gasket (10) used in a compressor in which a gas is force-fed, improve the sealability and contribute stored miniaturization of the compressor. The gasket (10) includes a raised portion (35) rising so as to surround a sealed portion. An end (43) of the raised portion (37) and a base surface (30) of the gasket (10) are not positioned on a single plane. In addition, the raised portion (35) is constituted with a flat surface (40) set at a height different from the height of the base surface (30) and an inclined surface (41) with a predetermined angle of inclination connecting the flat surface (40) with the base surface (30).
Description
- This application is a U.S. National Phase Application under 35 USC 371 of International Application PCT/JP2003/014429 filed on Nov. 13, 2003.
- The present invention relates to a gasket used in a compressor and more specifically, it relates to a structure that achieves both an improvement in the sealability and miniaturization of the compressor.
- A compressor used as an element constituting part of a refrigerating cycle includes a gasket so as to prevent leakage of compressed coolant through areas where the housing is connected and the like. Examples of the known art related to such gaskets include one in which ring-like beads are formed each surrounding one of the cylinders (see Japanese Unexamined Patent Publication No. H11-343974). These ring-like beads with their sections rising in a U-shape increase the force with which a gasket comes in contact with the areas around the cylinders and, as a result, leakage of the high-pressure coolant inside the cylinder to the outside can be prevented more effectively.
- In addition, in another example of the related art, beads are each made to curve over the entire width of a sealing portion (see Japanese Unexamined Patent Publication No. H10-196535. This structure is supposed to ensure that the beads are still allowed to become deformed readily even when the gasket has a large wall thickness.
- However, the invention disclosed in Japanese Unexamined Patent Publication No. H11-343974 has a problem in that since the levels of pressure required to deform the beads (full beads) with the U-shaped section is relatively high, the desired effect cannot be achieved with ease in conjunction with a gasket with a significant wall thickness. For instance, if the gasket is also to function as a retainer for regulating the movement of a discharge valve, the wall thickness of the gasket needs to be increased to ensure a higher level of gasket strength. For this reason, it is difficult to provide a gasket with a retainer function in conjunction with the full beads, and the difficulty becomes more pronounced in a CO2 cycle in which the discharge pressure reaches approximately 10 MPa.
- In addition, while the beads disclosed in Japanese Unexamined Patent Publication No. H10-196535 are made to curve over a width greater than that of the full beads and thus the required level of flexure can be assured even when the gasket has a relatively large wall thickness, they are not ideal for improving the sealability and do not contribute to miniaturization of the compressor.
- Accordingly, an object of the present invention is to provide a gasket used in a compressor, which contributes to both an improvement of the sealability and miniaturization of the compressor.
- In order to achieve the object described above, the present invention provides a gasket for a compressor used in a compressor in which a fluid is force-fed, having a raised portion that rises so as to surround a sealed portion and characterized in that the end of the raised portion on the inner edge side and a base surface of the gasket are not positioned on a single plane.
- The raised portion according to the present invention can be referred to as a “half bead” as opposed to the “full bead” with the U-shaped section disclosed in patent reference literature 1 mentioned earlier. Namely, while the full bead in the related art rises from its base surface to the vertex of the U-shape and then makes a U-turn to the point the height of which is the same as the height of the base surface so as to set the end of the bead on the inner edge side substantially to the height of the base surface, the half bead according to the present invention has an end thereof at a point arising from the base surface to a predetermined height and thus at least part of the U-turn portion ranging from the vertex to the base surface in the related art is not included in the half bead. In the gasket according to the present invention structured as described above, the raised portion is allowed to contact at high pressure the area around the sealed portion such as a cylinder to assure high sealability. Furthermore, since the raised portion does not have the U-turn portion, the entire width of the gasket can be reduced to realize overall miniaturization of the compressor. In addition, since a desirable level of flexure is retained at the raised portion assuming the structure described above, the raised portion can be deformed readily even when the gasket has a large wall thickness.
- It is desirable that the raised portion be constituted with a flat surface positioned at a height different from the height of the base surface and an inclined surface linking the flat surface and the base surface with a predetermined angle of inclination.
- In this case, the raised portion assumes a gently sloping shape or the shape of a shallow bowl. With such a gasket clamped at a specific position, the inclined surface becomes compressed and deformed to assume a flat shape which, in turn, causes the area where the inclined surface links with the base surface and the area where the inclined surface links with the flat surface to press against the sealed portion with a significant force, thereby assuring a high level of sealability. While the angle of inclination of the inclined surface should be adjusted as necessary in correspondence to the required level of sealability, the inclined surface should not be inclined at a right angle since the inclined surface needs to become deformed into a flat shape.
- Also, if the gasket is disposed between a cylinder block and a valve plate, the inner edge of the flat surface of the raised portion surrounding a cylinder formed at the cylinder block should not form a circle.
- Under normal circumstances, an intake valve, as well as the gasket, is clamped between the cylinder block and the valve plate. The raised portion should assume a noncircular shape according to the present invention as described above, mainly in consideration of the shape of the intake valve.
- In addition, for structural and functional reasons, the outer edge of the flat surface should not assume a shape similar to the shape of the inner edge of the flat surface. It is desirable that the outer edge of the flat surface be in contact with the intake valve in its entirety and that only a specific portion of the inner edge of the flat surface be in contact with the intake valve. The specific portion ideally is an area corresponding to a connecting base at which the lead portion of the intake valve is connected.
- If the gasket is disposed between the valve plate and a cylinder head, a raised portion should be disposed at least at a location at which a high/low pressure barrier wall is sealed and a location at which an atmospheric pressure barrier wall is sealed.
- The high/low pressure barrier wall separates a discharge chamber and an intake chamber both defined within the cylinder head from each other, whereas the atmospheric pressure barrier wall separates the inner space of the housing from the outside. A high level of sealability must be assured at the high/low pressure barrier wall and the atmospheric pressure barrier wall each separating two spaces with greatly differing pressures.
- In addition, the full advantage of the raised portion can be yielded by forming the inclined surface so as to set it in contact with the high/low pressure barrier wall or the atmospheric pressure barrier wall.
- It is also desirable that the gasket include a retainer portion for regulating the operation of a discharge valve.
- A discharge valve is normally disposed adjacent to the gasket between the valve plate and the cylinder head, and the gasket having a retainer function will help reduce the number of required parts and simplify the structure. In particular, the gasket for a compressor according to the present invention sustains a desirable level of flexure at the raised portion and is thus fully functional even when the wall thickness is increased to assure the retainer function.
- The gasket for a compressor according to the present invention assuring a high level of sealability and contributing to miniaturization is particularly ideal in applications in compressors used to force feed carbon dioxide under high-pressure conditions, the miniaturization of which is eagerly sought after.
-
FIG. 1 is a sectional view of the structure of a compressor achieved in an embodiment of the present invention; -
FIG. 2 is an enlarged sectional view of the structure of the member clamped between the cylinder block and the rear head (cylinder head); -
FIG. 3 is a perspective of a structural example that may be adopted in the intake valve-side gasket in the embodiment; -
FIG. 4 presents an enlarged top view and sectional view both showing the structure of a raised portion in the intake valve-side gasket; -
FIG. 5 is a top view showing the relationship between the raised portion in the intake valve-side gasket and the intake valve in a partial enlargement; -
FIG. 6 is a sectional view illustrating the advantage realized with the raised portion in the gasket according to the present invention in a partial enlargement; -
FIG. 7 is a sectional view showing the structure adopted in the discharge valve-side gasket in the embodiment in a partial enlargement; -
FIG. 8 presents a structural example that may be adopted in the rear head (cylinder head) in the embodiment in a top view illustrating the structures of the high/low pressure barrier wall and the atmospheric pressure barrier wall; and -
FIG. 9 (a) is a sectional view taken at a 90° angle relative to the line A-A′ inFIG. 7 , showing the structure adopted in the area around the retainer portion in the embodiment in a partial enlargement andFIG. 9 (b) illustrates the retainer effect achieved in the embodiment. - An embodiment of the present invention is now explained in reference to the attached drawings. A compressor 1 in
FIG. 1 , which constitutes part of a supercritical vapor compressing refrigerating cycle (CO2 cycle) in which carbon dioxide is used as the coolant, comprises acylinder block 2, a front-side cylinder head (hereafter referred to as the front-head) 3, a rear-side cylinder head (hereafter referred to as the rear head) 4, avalve plate 5,intake valves 6,discharge valves 7, an intake valve-side gasket 10, a discharge valve-side gasket 11, adrive shaft 14, aswash plate mechanism 15,pistons 16,pins - A plurality of
cylinders 25 are formed at thecylinder block 2, with apiston 16 slidably inserted at eachcylinder 25. In addition, at the end of eachcylinder 25 toward therear head 4, an intakevalve regulating portion 29 is formed, which regulates the opening operation of theintake valve 6. At therear head 4, anintake chamber 27 and adischarge chamber 28 are defined so as to face opposite eachcylinder 25. Inside the front had 3, ahollow crank case 30 is defined, with theswash plate mechanism 15 which includes aswash plate 32 and an angle-adjusting themechanism 33 disposed inside thecrank case 30. Thedrive shaft 14 is rotatably held by bearings and the like formed at thefront head 3 and thecylinder block 2 and is linked to theswash plate mechanism 15 so as to communicate a drive force to theswash plate mechanism 15. - As shown in
FIG. 2 , the intake valve-side gasket 10, theintake valve 6, thevalve plate 5, thedischarge valve 7 and the discharge valve-side gasket 11 are clamped between thecylinder block 2 and therear head 4. - The intake valve-
side gasket 10, which is disposed between thecylinder block 2 and the intake valve 6 (the valve plate 5), includes abase surface 30, raisedportions 35 and throughholes 42, as shown inFIGS. 2 through 4 .FIG. 3 shows an example of a structure that may be adopted in an intake valve-side gasket 10 used in a compressor 1 having sevencylinders 25, with the raisedportions 35 formed at specific positions so as to surround eachcylinder 25. - The raised
portions 35 each include aflat surface 40 and aninclined surface 41, with theflat surface 40 set at the position raised from thebase surface 30 by a predetermined extent and ranging substantially parallel to thebase surface 30. Theinclined surface 41 achieving a specific angle of inclination links theflat surface 40 and thebase surface 30. Consequently, anend 43 of theflat surface 40 and thebase surface 30 are set at positions with differing heights. - In addition, an
inner edge 44 of theflat surface 40 does not assume a circular shape and anouter edge 45 of theflat surface 40 does not have a shape similar to that of theinner edge 44 at the raisedportion 35 in the intake valve-side gasket 10, as shown inFIG. 4 , due to consideration for the shape of theintake valve 6 shown inFIG. 5 . In addition, it is desirable to set theouter edge 45 in contact with theintake valve 6 over its entirety and to set only aspecific portion 47 of theinner edge 44 in contact with the connecting base of alead portion 6 a of theintake valve 6. -
FIG. 6 shows a raisedportion 35 in the intake valve-side gasket 10 clamped between thecylinder block 2 and anintake valve 6. As the gasket is clamped between the cylinder block and the intake valve, the rear side of thebase surface 30 comes in contact with thecylinder block 2 and theflat surface 40 comes in contact with theintake valve 6 so as to flatten theinclined surface 41. As a result, a linkingarea 50 where thebase surface 30 and theinclined surface 41 link with each other and a linkingarea 51 where theflat surface 40 and theinclined surface 41 link with each other become pressed with a significant force, thereby achieving a high level of sealability. In addition, since the raisedportion 35 according to the present invention does not have a U-turn portion ranging from the vertex of the U-shape to the base surface present in the bead (full bead) with the U-shaped section in the related art, the absence of the U-turn portion allows the overall width of the gasket to be reduced. According to the present invention, full beads with, for instance, a width of 4 mm in the related art can be replaced with half beads with a width of 2 mm to reduce the external diameter of the compressor by 4 mm. Furthermore, a desirable level of flexure is sustained at the raisedportions 35 according to the present invention, which allows the present invention to be adopted in an ideal manner even when the gasket has a significant wall thickness. - As shown in
FIGS. 2 and 7 , the discharge valve-side gasket 11 disposed between the valve plate 5 (a discharge valve 7) and therear head 4 includes raisedportions 60 and aretainer portion 65 as shown inFIGS. 2 and 7 . The raisedportions 60 each include aflat surface 61 and aninclined surface 62, and the raisedportions 60 are disposed at a position facing opposite a high/lowpressure barrier wall 70 separating anintake chamber 27 from the correspondingdischarge chamber 28 formed in therear head 4 and an atmosphericpressure barrier wall 71 separating the space inside thedischarge chamber 28 from the outside of the housing (the atmosphere) with theinclined surfaces 62 made to come in contact with thebarrier walls -
FIG. 8 shows an example of a structure that may be adopted in the rear head 3 (the high/lowpressure barrier wall 70 and the atmospheric pressure barrier wall 71) used in conjunction with a compressor 1 having sevencylinders 25. In this structural example, the raisedportions 60 are disposed so as to surround theintake chambers 27 anddischarge chambers 28 along thebarrier walls flat surfaces 61 and theinclined surfaces 62 basically adopt shape characteristics and functions identical to those of theflat surfaces 40 and theinclined surfaces 41 at the raisedportions 35 in the intake valve-side gasket 6 described earlier, the inner edges of theflat surfaces 61, unlike the inner edges of theflat surfaces 40, do not need to assume a noncircular shape or the inner edges and the outer edges of theflat surfaces 61 do not need to be asymmetrical with respect to each other, as long as theflat surfaces 61 andinclined surfaces 62 achieve shapes matching those of thebarrier walls - The
retainer portions 65 provided to regulate the valve opening operation of thedischarge valves 7 are each formed by raising the discharge valve-side gasket 11 toward thedischarge chamber 28, as shown inFIGS. 2 and 9 (a). In addition, aretainer hold 72 is formed inside thedischarge chambers 28 at therear head 4. As shown in FIGS. 9(a) and 9(b), the retainer holds 72 are each formed so as to press against an area corresponding to a connectingbase 75 of alead portion 74 of thedischarge valve 7. - The presence of the retainer holds 65 in the discharge valve-
side gasket 11 contributes to a reduction in the number of required parts and further structural simplification. Furthermore, since a desired level of flexure is assured at the raisedportions 60 in the gasket according to the present invention, the present invention can be adopted in an ideal manner even when the gasket has a large wall thickness in order to assure its retaining function. - It is to be noted that while the raised
portion 35 in the intake valve-side gasket 10 rises toward theintake valve 6 and the raisedportion 60 rises toward therear head 4 in the discharge valve-side gasket 11, the gasket for a compressor according to the present invention is not limited to this example and all of or some of the raisedportions portions 35 at the intake valve-side gasket 10 may rise toward thecylinder block 2 and the raisedportion 60 at the discharge valve-side gasket 11 may rise toward the discharge valve 7 (valve plate). - According to the present invention, with the raised portions surrounding sealed portions formed as described above, a high level of sealability is assured and the compressor can be realized as a compact unit. In addition, even when the gasket has a larger wall thickness in order to achieve a retainer function at the gasket, a desirable level of flexure is still maintained at the raised portions and thus, the present invention can be adopted in an ideal manner even when the gasket has a significant wall thickness.
Claims (17)
1-11. (canceled)
12. A gasket for a compressor, used in a compressor in which a fluid is force-fed and having a raised portion rising so as to surround a sealed portion, wherein:
an end of said raised portion toward an inner edge and a base surface of said gasket are not set on a single plane;
said raised portion includes a flat surface positioned at a point with a height differing from the height of said base surface and an inclined surface with a predetermined angle of inclination, which links said flat surface with said base surface; and
an outer edge of said flat surface does not have a shape similar to the shape of said inner edge.
13. A gasket for a compressor according to claim 12 , disposed between a cylinder block and a valve plate, wherein:
an inner edge of said flat surface of said raised portion surrounding a cylinder formed at said cylinder block is not circular.
14. A gasket for a compressor according to claim 12 , wherein:
said outer edge of said flat surface in the entirety thereof comes in contact with an intake valve and only a specific portion of said inner edge comes in contact with said intake valve.
15. A gasket for a compressor according to claim 14 , wherein:
said specific portion corresponds to a connecting base portion of a lead portion of said intake valve.
16. A gasket for a compressor, used in a compressor in which a fluid is force-fed, having a raised portion rising so as to surround a sealed portion and disposed between a valve plate and a cylinder head, wherein:
an end of said raised portion toward an inner edge and a base surface of said gasket are not positioned on a single plane; and
said raised portion is disposed so as to seal at least a high/low pressure barrier wall and an atmospheric pressure barrier wall.
17. A gasket for a compressor according to claim 16 , wherein:
said inclined surface is disposed so as to come in contact with said high/low pressure barrier wall or said atmospheric pressure barrier wall.
18. A gasket for a compressor according to claim 16 , wherein:
a retainer portion for regulating an operation of a discharge valve is included.
19. A gasket for a compressor according to claim 17 , wherein:
a retainer portion for regulating an operation of a discharge valve is included.
20. A gasket for a compressor according to claim 12 , wherein:
in said compressor, carbon dioxide is force-fed.
21. A gasket for a compressor according to claim 13 , wherein:
in said compressor, carbon dioxide is force-fed.
22. A gasket for a compressor according to claim 14 , wherein:
in said compressor, carbon dioxide is force-fed.
23. A gasket for a compressor according to claim 15 , wherein:
in said compressor, carbon dioxide is force-fed.
24. A gasket for a compressor according to claim 16 , wherein:
in said compressor, carbon dioxide is force-fed.
25. A gasket for a compressor according to claim 17 , wherein:
in said compressor, carbon dioxide is force-fed.
26. A gasket for a compressor according to claim 18 , wherein:
in said compressor, carbon dioxide is force-fed.
27. A gasket for a compressor according to claim 19 , wherein:
in said compressor, carbon dioxide is force-fed.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2002376860 | 2002-12-26 | ||
JP2002-376860 | 2002-12-26 | ||
PCT/JP2003/014429 WO2004061305A1 (en) | 2002-12-26 | 2003-11-13 | Gasket for compressor |
Publications (1)
Publication Number | Publication Date |
---|---|
US20060147330A1 true US20060147330A1 (en) | 2006-07-06 |
Family
ID=32708282
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US10/540,578 Abandoned US20060147330A1 (en) | 2002-12-26 | 2003-11-13 | Gasket for compressor |
Country Status (5)
Country | Link |
---|---|
US (1) | US20060147330A1 (en) |
EP (1) | EP1586773B1 (en) |
JP (1) | JP4573165B2 (en) |
DE (1) | DE60329332D1 (en) |
WO (1) | WO2004061305A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20080063550A1 (en) * | 2006-09-07 | 2008-03-13 | Masaki Inoue | Piston type compressor |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2007154834A (en) * | 2005-12-07 | 2007-06-21 | Toyota Industries Corp | Piston type compressor |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4764091A (en) * | 1985-12-05 | 1988-08-16 | Kabushiki Kaisha Toyoda Jidoshokki Seisakusho | Piston type compressor for air conditioning unit with asymmetric valve mechanisms |
US5582415A (en) * | 1993-08-31 | 1996-12-10 | Kokusan Parts Industry Co., Ltd. | Metal gasket |
US5857839A (en) * | 1993-08-10 | 1999-01-12 | Sanden Corporation | Compressor having noise and vibration reducing reed valve |
US5988651A (en) * | 1996-10-07 | 1999-11-23 | Ishikawa Gasket Co., Ltd. | Metal gasket with sealing bead and bead protecting portion |
US20010019698A1 (en) * | 1998-03-09 | 2001-09-06 | Kabushiki Kaisha Toyoda Jidoshokki Seisakusho | Single-ended swash plate compressor |
Family Cites Families (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0612095B2 (en) * | 1985-05-09 | 1994-02-16 | 日本メタルガスケット株式会社 | Veneer metal gasket |
JP2532406Y2 (en) * | 1991-05-09 | 1997-04-16 | 株式会社豊田自動織機製作所 | Gasket with retainer for compressor |
JPH0640389U (en) * | 1992-10-28 | 1994-05-27 | サンデン株式会社 | Discharge valve device of compressor |
JPH08232759A (en) * | 1995-02-22 | 1996-09-10 | Nippon Gasket Co Ltd | Metallic gasket for exhaust manifold |
JPH109136A (en) * | 1996-06-24 | 1998-01-13 | Toyota Autom Loom Works Ltd | Compressor |
JPH10196535A (en) * | 1997-01-08 | 1998-07-31 | Toyota Autom Loom Works Ltd | Gasket for compressor |
JPH11343974A (en) * | 1998-05-29 | 1999-12-14 | Toyota Autom Loom Works Ltd | Reciprocating compressor |
JP2000018154A (en) * | 1998-07-01 | 2000-01-18 | Toyota Autom Loom Works Ltd | Reciprocating compressor |
JP2001132629A (en) * | 1999-11-09 | 2001-05-18 | Zexel Valeo Climate Control Corp | Swash plate compressor |
JP2002013640A (en) * | 2000-06-29 | 2002-01-18 | Uchiyama Mfg Corp | Cylinder head gasket |
JP2002070739A (en) * | 2000-08-30 | 2002-03-08 | Zexel Valeo Climate Control Corp | Reciprocating refrigerating compressor |
JP2002323135A (en) * | 2001-04-25 | 2002-11-08 | Nippon Gasket Co Ltd | Single-layer metal gasket |
-
2003
- 2003-11-13 DE DE60329332T patent/DE60329332D1/en not_active Expired - Lifetime
- 2003-11-13 EP EP03774014A patent/EP1586773B1/en not_active Expired - Fee Related
- 2003-11-13 US US10/540,578 patent/US20060147330A1/en not_active Abandoned
- 2003-11-13 WO PCT/JP2003/014429 patent/WO2004061305A1/en active Application Filing
- 2003-11-13 JP JP2004564471A patent/JP4573165B2/en not_active Expired - Fee Related
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4764091A (en) * | 1985-12-05 | 1988-08-16 | Kabushiki Kaisha Toyoda Jidoshokki Seisakusho | Piston type compressor for air conditioning unit with asymmetric valve mechanisms |
US5857839A (en) * | 1993-08-10 | 1999-01-12 | Sanden Corporation | Compressor having noise and vibration reducing reed valve |
US5582415A (en) * | 1993-08-31 | 1996-12-10 | Kokusan Parts Industry Co., Ltd. | Metal gasket |
US5988651A (en) * | 1996-10-07 | 1999-11-23 | Ishikawa Gasket Co., Ltd. | Metal gasket with sealing bead and bead protecting portion |
US20010019698A1 (en) * | 1998-03-09 | 2001-09-06 | Kabushiki Kaisha Toyoda Jidoshokki Seisakusho | Single-ended swash plate compressor |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20080063550A1 (en) * | 2006-09-07 | 2008-03-13 | Masaki Inoue | Piston type compressor |
Also Published As
Publication number | Publication date |
---|---|
WO2004061305A1 (en) | 2004-07-22 |
EP1586773A4 (en) | 2006-05-24 |
EP1586773A1 (en) | 2005-10-19 |
JPWO2004061305A1 (en) | 2006-05-11 |
EP1586773B1 (en) | 2009-09-16 |
DE60329332D1 (en) | 2009-10-29 |
JP4573165B2 (en) | 2010-11-04 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US20030206812A1 (en) | Vacuum preventing device for scroll compressor | |
US7481628B2 (en) | Diaphragm pump | |
US20040126259A1 (en) | Vacuum preventing device of scroll compressor | |
JPH0351915B2 (en) | ||
US20090081060A1 (en) | Compressor | |
EP0961032B1 (en) | A reciprocating type refrigerant compressor with an improved internal sealing unit | |
JPH109136A (en) | Compressor | |
JP4408389B2 (en) | Swash plate compressor | |
EP1586773B1 (en) | Gasket for compressor | |
JP2002317764A (en) | Compressor sealing structure and compressor | |
KR100315302B1 (en) | A gasket for compressor | |
EP1566544A2 (en) | Compressor | |
US7014433B2 (en) | Shaped valve seats in displacement compressors | |
JP2002070739A (en) | Reciprocating refrigerating compressor | |
US6634868B2 (en) | Compressor | |
US20080063550A1 (en) | Piston type compressor | |
JPH10176671A (en) | Reinforcing device for compressor | |
US6554581B2 (en) | Air conditioning compressor | |
JP2008057332A (en) | Compressor | |
US20010004445A1 (en) | Scroll compressor | |
JP3069736B1 (en) | Gas compressor | |
KR20220049593A (en) | piston type compressor | |
JP2014125994A (en) | Piston type compressor | |
JP2009281232A (en) | Piston ring for piston reciprocating type compressor | |
JPWO2004081382A1 (en) | Compressor |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: ZEXEL VALEO CLIMATE CONTROL CORPORATION, JAPAN Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:KANAI, HIROSHI;FURUYA, SHUNICHI;TAKAZAWA, OSAMU;AND OTHERS;REEL/FRAME:017610/0522;SIGNING DATES FROM 20050519 TO 20050524 |
|
STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |