WO2008072809A1 - Apparatus for adjusting top clearance of reciprocating compressor - Google Patents
Apparatus for adjusting top clearance of reciprocating compressor Download PDFInfo
- Publication number
- WO2008072809A1 WO2008072809A1 PCT/KR2006/005467 KR2006005467W WO2008072809A1 WO 2008072809 A1 WO2008072809 A1 WO 2008072809A1 KR 2006005467 W KR2006005467 W KR 2006005467W WO 2008072809 A1 WO2008072809 A1 WO 2008072809A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- piston
- pistons
- top clearance
- piston connection
- suction
- Prior art date
Links
- 230000004044 response Effects 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 239000002826 coolant Substances 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 230000008859 change Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000002459 sustained effect Effects 0.000 description 1
Classifications
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- 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
- F04B27/1054—Actuating elements
- F04B27/1063—Actuating-element bearing means or driving-axis bearing means
-
- 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
- F04B27/1054—Actuating elements
- F04B27/1072—Pivot mechanisms
-
- 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
- F04B27/14—Control
- F04B27/16—Control of pumps with stationary cylinders
- F04B27/18—Control of pumps with stationary cylinders by varying the relative positions of a swash plate and a cylinder block
-
- 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
- F04B39/0005—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 adaptations of pistons
-
- 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
- F04B39/10—Adaptations or arrangements of 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
- 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
-
- 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
- F04B39/14—Provisions for readily assembling or disassembling
-
- 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
- F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
- F04B49/12—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00 by varying the length of stroke of the working 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
- F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
- F04B49/16—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00 by adjusting the capacity of dead spaces of working chambers
-
- 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
- F04B27/14—Control
- F04B27/16—Control of pumps with stationary cylinders
- F04B27/18—Control of pumps with stationary cylinders by varying the relative positions of a swash plate and a cylinder block
- F04B27/1804—Controlled by crankcase pressure
- F04B2027/1822—Valve-controlled fluid connection
- F04B2027/1827—Valve-controlled fluid connection between crankcase and discharge chamber
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
- F05B2210/00—Working fluid
- F05B2210/10—Kind or type
- F05B2210/12—Kind or type gaseous, i.e. compressible
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
- F05B2260/00—Function
- F05B2260/30—Retaining components in desired mutual position
- F05B2260/301—Retaining bolts or nuts
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
- F05B2280/00—Materials; Properties thereof
- F05B2280/50—Intrinsic material properties or characteristics
- F05B2280/5001—Elasticity
Definitions
- the present invention relates to an apparatus for adjusting a top clearance of a reciprocating compressor, and more particularly, to an apparatus for adjusting a top clearance of a reciprocating compressor capable of readily adjusting a top clearance between a bottom surface of a piston and a valve, without the need to disassemble components.
- a reciprocating compressor is composed of a piston, a piston drive apparatus, a cylinder block, and a valve, and widely used in a compressor, a pump, or the like.
- FIGS. IA and IB illustrate a swash plate type compressor disclosed in Korean
- Patent Registration No. 0519744 as an example of a reciprocating compressor.
- the conventional variable displacement swash plate type compressor 10 includes a cylinder block 11 having a plurality of cylinder bores 1 Ia arranged in parallel in a longitudinal direction at its inner periphery, a front housing 12 sealed in the front of the cylinder block 11, and a rear housing 13 sealed in the rear of the cylinder block 11 with a valve plate 13a interposed therebetween.
- a crank chamber 14 is disposed inside the front housing 12.
- One end of a drive shaft 15 passing through the crank chamber 14 is rotatably installed at the center of the front housing 12 and the other end of the drive shaft 15 is supported by a bearing l ie at a center shaft hole 1 Ib in the cylinder block 11.
- a lug plate 16 and a swash plate 17 are installed on the drive shaft 15, and a spring 27 is interposed between the lug plate 16 and the swash plate 17 to re- siliently support the swash plate 17 against the lug plate 16.
- the lug plate 16 has a pair of power transmission projections 16a each having a straight hinge hole 16b and projecting from one surface thereof to be simultaneously rotated with the drive shaft 15.
- the swash plate 17 is inserted into the drive shaft 15 at a predetermined angle, and hinge pins 18 are inserted into the hinge holes 16b formed at the power transmission projections 16a of the lug plate 16, such that the swash plate 17 rotates with the lug plate 16, causing it to vary in inclination.
- shoes 20 are inserted into an outer periphery of the swash plate 17 to be slidably inserted into pistons 19 disposed in the cylinder bores 11a.
- the rear housing 13 has a suction chamber 21 and a discharge chamber
- valve plate 13a interposed between the rear housing 13 and the cylinder block 11 has suction ports 23 and discharge ports 24 corresponding to the cylinder bores 11a.
- 13a has a suction lid 25 and a discharge lid 26, respectively, which open and close the suction port 23 and the discharge port 24 in response to pressure variation caused by reciprocation of the piston 19.
- the rear housing 13 has a control valve 28 for communicating the crank chamber 14 with the suction chamber 21 such that a difference between a coolant suction pressure in the cylinder bore 11a and a pressure in the crank chamber 14 is varied to adjust inclination of the swash plate 17.
- the conventional variable displacement swash plate type com pressor 10 adjusts inclination of the swash plate 17 in response to the pressure difference between a pressure in the crank chamber 14 and a suction pressure in the cylinder bore 1 Ia, as shown in FIGS. IA, IB, and 2, to adjust a stroke of the piston 19 connected to the swash plate 17 depending on inclination variation of the swash plate 17, thereby varying discharge capacity of the compressor.
- top clearance TC may be adjusted as necessary.
- a thrust bearing 31 having a predetermined width is installed between the cylinder block 11 and the drive shaft 15.
- FIG. 2 illustrates another swash plate type compressor disclosed in
- a top clearance is obtained by a bearing 78 interposed between two laces 77.
- the top clearance can be adjusted by changing the thickness of any of the two laces 77.
- An object of the present invention is to provide an apparatus for adjusting a top clearance capable of precisely and conveniently adjusting the top clearance on the basis of characteristics of a valve or piston of a reciprocating compressor.
- An aspect of the invention provides an apparatus for adjusting a top clearance of a reciprocating compressor including: a housing, a cylinder block having a plurality of cylinder bores, pistons reciprocally accommodated in the cylinder bores, a piston drive means for driving the pistons, piston connection shafts connected to the pistons, suction/discharge valves installed opposite to bottoms of the pistons, and a suction chamber and a discharge chamber formed in the housing through the medium of the suction/discharge valves, characterized in that each of the piston connection shafts has a conveyance nut threadedly engaged therearound.
- the conveyance nut When seen in an axial direction of the piston connection shaft, the conveyance nut may have a fixing groove having a plurality of prominences and depressions formed at the center of the conveyance nut in a circumferential direction, a fixing washer having prominences and depressions formed therearound may be installed in the fixing groove, and the fixing washer may pass through the piston connection shaft.
- the fixing washer may be formed of a resilient thin plate, and may be resiliently inserted into the fixing groove of the conveyance nut.
- the fixing washer may be fastened to the piston connection shaft in a rotational direction.
- the piston connection shaft and the fixing washer coupled with the piston connection shaft may be formed in a polygonal shape having round corners or an oval shape.
- the fixing groove of the conveyance nut, with which the fixing washer is coupled may have a step formed therearound.
- a thrust bearing may be installed in the front or rear of the conveyance nut.
- the piston connection shaft is a drive shaft rotatably supported by the cylinder block, a swash plate may be installed at the drive shaft to simultaneously rotate with the drive shaft and vary the inclination thereof, and the piston may be reciprocally accommodated in the cylinder bore and be slidable back and forth with respect to the swash plate.
- FIG. IA is a longitudinal cross-sectional view of a conventional swash plate type compressor
- FIG. IB is an enlarged view of a top clearance of FIG. IA;
- FIG. 2 is a longitudinal cross-sectional view of another conventional swash plate type compressor
- FIG. 3 is a longitudinal cross-sectional view of a machine having an apparatus for adjusting a top clearance in accordance with an exemplary embodiment of the present invention
- FIG. 4 is an enlarged longitudinal cross-sectional view of the apparatus for adjusting a top clearance of FIG. 3;
- FIG. 5 is a partial cross-sectional perspective view of FIG. 4.
- FIG. 6 is an exploded cross-sectional perspective view of FIG. 4.
- a reciprocating compressor 1000 in accordance with the present invention includes a housing 100, a cylinder block 110 having a plurality of cylinder bores 110a, a drive shaft 140 rotatably supported by the cylinder block 110, a swash plate 150 connected to the drive shaft 140 and rotatably installed to vary its inclination, pistons 200 reciprocally accommodated in the cylinder bores 110a and capable of sliding back and forth with respect to the swash plate 150, a suction/discharge valve apparatus 300 installed opposite to a bottom surface of the piston 200, and a suction chamber 131 and a discharge chamber 132 formed at the housing 100 through the medium of the suction/discharge valve apparatus 300.
- the housing 100 comprises a front housing 120 and a rear housing 130, interposing the cylinder block 110 therebetween.
- the rear housing 130 has the suction chamber 131 and the discharge chamber 132.
- a valve plate 330 has suction ports 331 for communicating the cylinder bores 110a with the suction chamber 131, and discharge ports 332 for communicating the cylinder bores 110a with the discharge chamber 132.
- suction valves and the discharge valves for opening and closing the suction ports 331 and the discharge ports 332 in response to pressure variation depending on reciprocation of the pistons 200, respectively.
- the cylinder block 110 has eight cylinder bores 110a. Coolant introduced from the suction chamber 131 by the pistons 200 reciprocating through the cylinder bores 110a is continuously compressed.
- the drive shaft 140 is rotatably supported by the front housing 120 and the cylinder block 110 via a bearing 400.
- the swash plate 150 is slidably coupled with the pistons 200 by shoes 201.
- connection links 600 are interposed between the connection projections 155 and the drive shaft 140, which are connected to each other by hinge pins 610. Therefore, the connection links 600 and the connection projections 155, and the connection links 600 and the drive shaft 140 can be hinged to each other.
- a top clearance adjusting apparatus 500 for adjusting a top clearance between the pistons 200 and the suction/ discharge valve apparatus 300 is installed to appropriately adjust the top clearance which varies according to a deviation between the length of the valve or piston, and the length of the cylinder.
- a conveyance nut 510 may be threadedly engaged with the drive shaft
- the drive shaft 140 axially moves depending on rotation of the conveyance nut 510. That is, the conveyance nut 510 becomes a rotating drive part which rotates at the original place, not moving in an axial direction, and the drive shaft 140 becomes a driven rotation part.
- a thrust bearing or an equivalent structure 530 is installed before or after the conveyance nut 510.
- the thrust bearing is selected there is no need to change its specification.
- a conveyance distance per revolution of the conveyance nut 510 should be precisely set. That is, when the top clearance is determined, using the conveyance distance a user can rotate the conveyance nut 510 to precisely adjust the top clearance.
- the conveyance nut 510 is threadedly engaged with the drive shaft 140. Therefore, in order to fix the top clearance, even though the drive shaft is rotated, the conveyance nut 510 should be rotated in a state in which the rotated position is fixed to the drive shaft 140.
- the drive shaft 140 and the conveyance nut 510 require an anti-rotation structure.
- the anti-rotation structure may be a fastening force of the threaded engagement itself which is between the drive shaft 140 and the conveyance nut 510.
- a fixing washer 520 is coupled with the conveyance nut 510 through the drive shaft 140 to be fixed thereto.
- the conveyance nut 510 when seen in an axial direction, includes a fixing groove 511 having a plurality of prominences and depressions 512 formed at the center thereof in a circumferential direction, and the fixing washer 520 has prominences and depressions 522 formed in a circumferential direction thereof to be coupled with the fixing groove 511.
- the top clearance can be determined depending on the number of the prominences and depressions 512 and 522 (in FIG. 4, fourteen). That is, under the condition that its strength can be sustained, the greater the number of prominences and depressions, the higher the precision of the top clearance.
- the top clearance can be adjusted to the micron unit.
- the fixing washer 520 is made of a resilient hollow thin plate, the fixing washer 520 is resiliently inserted into the fixing groove 511 of the conveyance nut 510 to securely fix the conveyance nut 510.
- the fixing washer 520 should be fixed to the drive shaft 140 without any relative rotation. For this purpose, as shown, the drive shaft 140 and the fixing washer
- a step is circumferentially formed at the fixing groove 511 of the conveyance nut 510, with which the fixing washer 520 is coupled, to prevent the conveyance nut 510 from slipping in an axial direction during operation of the compressor.
- Reference symbol P designates a pulley for receiving power from an engine (not shown) through a belt (not shown) to rotate the drive shaft 140.
- the above-described top clearance adjusting apparatus 500 may be adapted to various reciprocating compressors including a piston, a cylinder block, a valve, and a piston drive unit.
- Various swash plate type or crank-slide link drive type mechanisms using rotational force of an engine may be adapted as the piston drive unit.
- the top clearance adjusting apparatus including the conveyance nut and the fixing washer is coupled with the piston connection shaft of the reciprocating compressor such as a pump, as well as the compressor shown in FIGS. 1 and 2, thereby readily enabling top clearance adjustment.
Abstract
Provided is an apparatus for adjusting a top clearance of a reciprocating compressor including: a housing, a cylinder block having a plurality of cylinder bores, pistons reciprocally accommodated in the cylinder bores, a piston drive means for driving the pistons, piston connection shafts connected to the pistons, suction/discharge valves installed opposite to bottoms of the pistons, and a suction chamber and a discharge chamber formed in the housing through the medium of the suction/discharge valves, characterized in that each of the piston connection shafts has a conveyance nut threadedly engaged therearound. Therefore, it is possible to readily and precisely adjust a top clearance between a piston and a valve apparatus of a reciprocating compressor, and a dead volume caused by the top clearance can be minimized depending on characteristics of the valve and piston.
Description
Description
APPARATUS FOR ADJUSTING TOP CLEARANCE OF RECIPROCATING COMPRESSOR
Technical Field
[1] The present invention relates to an apparatus for adjusting a top clearance of a reciprocating compressor, and more particularly, to an apparatus for adjusting a top clearance of a reciprocating compressor capable of readily adjusting a top clearance between a bottom surface of a piston and a valve, without the need to disassemble components.
[2]
Background Art
[3] A reciprocating compressor is composed of a piston, a piston drive apparatus, a cylinder block, and a valve, and widely used in a compressor, a pump, or the like.
[4] FIGS. IA and IB illustrate a swash plate type compressor disclosed in Korean
Patent Registration No. 0519744, as an example of a reciprocating compressor.
[5] As shown in FIG. IA, the conventional variable displacement swash plate type compressor 10 includes a cylinder block 11 having a plurality of cylinder bores 1 Ia arranged in parallel in a longitudinal direction at its inner periphery, a front housing 12 sealed in the front of the cylinder block 11, and a rear housing 13 sealed in the rear of the cylinder block 11 with a valve plate 13a interposed therebetween.
[6] A crank chamber 14 is disposed inside the front housing 12. One end of a drive shaft 15 passing through the crank chamber 14 is rotatably installed at the center of the front housing 12 and the other end of the drive shaft 15 is supported by a bearing l ie at a center shaft hole 1 Ib in the cylinder block 11.
[7] In addition, a lug plate 16 and a swash plate 17 are installed on the drive shaft 15, and a spring 27 is interposed between the lug plate 16 and the swash plate 17 to re- siliently support the swash plate 17 against the lug plate 16.
[8] The lug plate 16 has a pair of power transmission projections 16a each having a straight hinge hole 16b and projecting from one surface thereof to be simultaneously rotated with the drive shaft 15. The swash plate 17 is inserted into the drive shaft 15 at a predetermined angle, and hinge pins 18 are inserted into the hinge holes 16b formed at the power transmission projections 16a of the lug plate 16, such that the swash plate 17 rotates with the lug plate 16, causing it to vary in inclination.
[9] Further, shoes 20 are inserted into an outer periphery of the swash plate 17 to be slidably inserted into pistons 19 disposed in the cylinder bores 11a.
[10] Therefore, as the swash plate 17 rotates in a tilted state, the pistons 19 inserted into
the outer periphery of the swash plate 17 via the shoes 20 reciprocate in the cylinder bores 1 Ia of the cylinder block 11.
[11] In addition, the rear housing 13 has a suction chamber 21 and a discharge chamber
22. The valve plate 13a interposed between the rear housing 13 and the cylinder block 11 has suction ports 23 and discharge ports 24 corresponding to the cylinder bores 11a.
[12] Each of the suction ports 23 and the discharge ports 24 formed at the valve plate
13a has a suction lid 25 and a discharge lid 26, respectively, which open and close the suction port 23 and the discharge port 24 in response to pressure variation caused by reciprocation of the piston 19.
[13] Further, the rear housing 13 has a control valve 28 for communicating the crank chamber 14 with the suction chamber 21 such that a difference between a coolant suction pressure in the cylinder bore 11a and a pressure in the crank chamber 14 is varied to adjust inclination of the swash plate 17.
[14] As described above, the conventional variable displacement swash plate type com pressor 10 adjusts inclination of the swash plate 17 in response to the pressure difference between a pressure in the crank chamber 14 and a suction pressure in the cylinder bore 1 Ia, as shown in FIGS. IA, IB, and 2, to adjust a stroke of the piston 19 connected to the swash plate 17 depending on inclination variation of the swash plate 17, thereby varying discharge capacity of the compressor.
[15] Meanwhile, as shown in FIG. IB, there is a top clearance TC between the valve plate 13a and the piston 19. Although the top clearance TC is necessary to prevent a collision between the piston 19 and the valve plate 13a, it is practical to minimize the top clearance for increased compression efficiency.
[16] In addition, the top clearance TC may be adjusted as necessary.
[17] In this case, as shown in FIG. IA, a thrust bearing 31 having a predetermined width is installed between the cylinder block 11 and the drive shaft 15.
[18] Therefore, when the top clearance is modified depending on characteristics of the valve or piston, the only solution is to replace the thrust bearing 31. However, the replacement of the thrust bearing 31 requires disassembly of the entire set of components making the operation troublesome.
[19] Moreover, if there is no fitting thrust bearing to produce the required top clearance, additional costs are incurred to manufacture a separate thrust bearing.
[20] Meanwhile, FIG. 2 illustrates another swash plate type compressor disclosed in
Korean Patent Registration No. 0529716.
[21] In the conventional compressor, a top clearance is obtained by a bearing 78 interposed between two laces 77. In this case, the top clearance can be adjusted by changing the thickness of any of the two laces 77.
[22] However, to precisely adjust the top clearance according to the conventional art,
laces 77 of various thicknesses are needed, thereby causing storage and maintenance difficulties, and complicating assembly.
[23] The above problems can be generated in various reciprocating compressors that are composed of a pump, a piston, a piston drive unit, a valve, a cylinder block, and so on, as well as the aforementioned compressor.
[24]
Disclosure of Invention Technical Problem
[25] An object of the present invention is to provide an apparatus for adjusting a top clearance capable of precisely and conveniently adjusting the top clearance on the basis of characteristics of a valve or piston of a reciprocating compressor.
[26]
Technical Solution
[27] An aspect of the invention provides an apparatus for adjusting a top clearance of a reciprocating compressor including: a housing, a cylinder block having a plurality of cylinder bores, pistons reciprocally accommodated in the cylinder bores, a piston drive means for driving the pistons, piston connection shafts connected to the pistons, suction/discharge valves installed opposite to bottoms of the pistons, and a suction chamber and a discharge chamber formed in the housing through the medium of the suction/discharge valves, characterized in that each of the piston connection shafts has a conveyance nut threadedly engaged therearound.
[28] When seen in an axial direction of the piston connection shaft, the conveyance nut may have a fixing groove having a plurality of prominences and depressions formed at the center of the conveyance nut in a circumferential direction, a fixing washer having prominences and depressions formed therearound may be installed in the fixing groove, and the fixing washer may pass through the piston connection shaft.
[29] The fixing washer may be formed of a resilient thin plate, and may be resiliently inserted into the fixing groove of the conveyance nut.
[30] The fixing washer may be fastened to the piston connection shaft in a rotational direction.
[31] The piston connection shaft and the fixing washer coupled with the piston connection shaft may be formed in a polygonal shape having round corners or an oval shape.
[32] The fixing groove of the conveyance nut, with which the fixing washer is coupled, may have a step formed therearound.
[33] A thrust bearing may be installed in the front or rear of the conveyance nut.
[34] The piston connection shaft is a drive shaft rotatably supported by the cylinder
block, a swash plate may be installed at the drive shaft to simultaneously rotate with the drive shaft and vary the inclination thereof, and the piston may be reciprocally accommodated in the cylinder bore and be slidable back and forth with respect to the swash plate.
[35]
Brief Description of the Drawings
[36] The above and other objects, features and advantages of the present invention will be more apparent from the following detailed description taken in conjunction with the accompanying drawings, in which:
[37] FIG. IA is a longitudinal cross-sectional view of a conventional swash plate type compressor;
[38] FIG. IB is an enlarged view of a top clearance of FIG. IA;
[39] FIG. 2 is a longitudinal cross-sectional view of another conventional swash plate type compressor;
[40] FIG. 3 is a longitudinal cross-sectional view of a machine having an apparatus for adjusting a top clearance in accordance with an exemplary embodiment of the present invention;
[41] FIG. 4 is an enlarged longitudinal cross-sectional view of the apparatus for adjusting a top clearance of FIG. 3;
[42] FIG. 5 is a partial cross-sectional perspective view of FIG. 4; and
[43] FIG. 6 is an exploded cross-sectional perspective view of FIG. 4.
Best Mode for Carrying Out the Invention
[44] Hereinafter, exemplary embodiments of the present invention will be described with reference to FIGS 3 to 6.
[45] First, a reciprocating compressor 1000 in accordance with the present invention includes a housing 100, a cylinder block 110 having a plurality of cylinder bores 110a, a drive shaft 140 rotatably supported by the cylinder block 110, a swash plate 150 connected to the drive shaft 140 and rotatably installed to vary its inclination, pistons 200 reciprocally accommodated in the cylinder bores 110a and capable of sliding back and forth with respect to the swash plate 150, a suction/discharge valve apparatus 300 installed opposite to a bottom surface of the piston 200, and a suction chamber 131 and a discharge chamber 132 formed at the housing 100 through the medium of the suction/discharge valve apparatus 300.
[46] The housing 100 comprises a front housing 120 and a rear housing 130, interposing the cylinder block 110 therebetween.
[47] In addition, the rear housing 130 has the suction chamber 131 and the discharge chamber 132. A valve plate 330 has suction ports 331 for communicating the cylinder
bores 110a with the suction chamber 131, and discharge ports 332 for communicating the cylinder bores 110a with the discharge chamber 132.
[48] Further, the suction ports 331 and the discharge ports 332 formed at the valve plate
330 include suction valves and the discharge valves for opening and closing the suction ports 331 and the discharge ports 332 in response to pressure variation depending on reciprocation of the pistons 200, respectively.
[49] The cylinder block 110 has eight cylinder bores 110a. Coolant introduced from the suction chamber 131 by the pistons 200 reciprocating through the cylinder bores 110a is continuously compressed.
[50] The drive shaft 140 is rotatably supported by the front housing 120 and the cylinder block 110 via a bearing 400.
[51] Further, the swash plate 150 is slidably coupled with the pistons 200 by shoes 201.
[52] Furthermore, the swash plate 150 has connection projections 155 formed at its front and rear parts. Connection links 600 are interposed between the connection projections 155 and the drive shaft 140, which are connected to each other by hinge pins 610. Therefore, the connection links 600 and the connection projections 155, and the connection links 600 and the drive shaft 140 can be hinged to each other.
[53] Meanwhile, in accordance with the present invention, a top clearance adjusting apparatus 500 for adjusting a top clearance between the pistons 200 and the suction/ discharge valve apparatus 300 is installed to appropriately adjust the top clearance which varies according to a deviation between the length of the valve or piston, and the length of the cylinder.
[54] Specifically, a conveyance nut 510 may be threadedly engaged with the drive shaft
140. Therefore, the drive shaft 140 axially moves depending on rotation of the conveyance nut 510. That is, the conveyance nut 510 becomes a rotating drive part which rotates at the original place, not moving in an axial direction, and the drive shaft 140 becomes a driven rotation part. Of course, in order to prevent axial movement of the conveyance nut 510, a thrust bearing or an equivalent structure 530 is installed before or after the conveyance nut 510. However, unlike in the conventional art, once the thrust bearing is selected there is no need to change its specification.
[55] In order to precisely adjust the top clearance TC, a conveyance distance per revolution of the conveyance nut 510 should be precisely set. That is, when the top clearance is determined, using the conveyance distance a user can rotate the conveyance nut 510 to precisely adjust the top clearance.
[56] For this purpose, it is possible to set a circumferential scale indicator in the conveyance nut 510 to adjust the rotation.
[57] Eventually, in order to adjust the top clearance by rotating the conveyance nut 510, the conveyance nut 510 is threadedly engaged with the drive shaft 140. Therefore, in
order to fix the top clearance, even though the drive shaft is rotated, the conveyance nut 510 should be rotated in a state in which the rotated position is fixed to the drive shaft 140. For this purpose, the drive shaft 140 and the conveyance nut 510 require an anti-rotation structure. [58] As described above, the anti-rotation structure may be a fastening force of the threaded engagement itself which is between the drive shaft 140 and the conveyance nut 510. [59] However, in this case, the threaded engagement may loosen due to vibration and load variation of the compressor, and the drive shaft 140 and the conveyance nut 510 may be worn out or damaged under high-speed rotation and heavy load. [60] In order to solve the problems, a fixing washer 520 is coupled with the conveyance nut 510 through the drive shaft 140 to be fixed thereto. [61] Specifically, when seen in an axial direction, the conveyance nut 510 includes a fixing groove 511 having a plurality of prominences and depressions 512 formed at the center thereof in a circumferential direction, and the fixing washer 520 has prominences and depressions 522 formed in a circumferential direction thereof to be coupled with the fixing groove 511. [62] Therefore, precision of the top clearance can be determined depending on the number of the prominences and depressions 512 and 522 (in FIG. 4, fourteen). That is, under the condition that its strength can be sustained, the greater the number of prominences and depressions, the higher the precision of the top clearance. [63] When an axial movement distance of the drive shaft 140 moved by one revolution of the conveyance nut 510 is lmm, the top clearance can be adjusted to the micron unit. [64] In addition, when the fixing washer 520 is made of a resilient hollow thin plate, the fixing washer 520 is resiliently inserted into the fixing groove 511 of the conveyance nut 510 to securely fix the conveyance nut 510. [65] Of course, the fixing washer 520 should be fixed to the drive shaft 140 without any relative rotation. For this purpose, as shown, the drive shaft 140 and the fixing washer
520 coupled with the drive shaft 140 have a triangular shape with round corners.
However, when there is no relative rotation between the fixing washer 520 and the drive shaft 140, various shapes of structures (for example, a polygonal or oval shape) may be employed. [66] Eventually, when the drive shaft 140 is rotated, the fixing washer 520 fixed to the drive shaft 140 is rotated, and the conveyance nut 510 inserted into the fixing washer
520 is rotated therewith. [67] In addition, a step is circumferentially formed at the fixing groove 511 of the conveyance nut 510, with which the fixing washer 520 is coupled, to prevent the
conveyance nut 510 from slipping in an axial direction during operation of the compressor.
[68] Reference symbol P designates a pulley for receiving power from an engine (not shown) through a belt (not shown) to rotate the drive shaft 140.
[69] Hereinafter, an adjustment example of the top clearance will be described.
[70] When the conveyance nut 510 is rotated counterclockwise along a male thread formed on a surface of the drive shaft 140, the drive shaft 140 is spaced apart from the conveyance nut 510, and the swash plate 150 connected to the drive shaft 140 by the connection links 600, simultaneously moves forward with the pistons 200 linked to the swash plate 150 to increase the top clearance.
[71] On the other hand, when the conveyance nut 510 is rotated clockwise, the top clearance is reduced.
[72] The above-described top clearance adjusting apparatus 500 may be adapted to various reciprocating compressors including a piston, a cylinder block, a valve, and a piston drive unit. Various swash plate type or crank-slide link drive type mechanisms using rotational force of an engine may be adapted as the piston drive unit.
[73] That is, the top clearance adjusting apparatus including the conveyance nut and the fixing washer is coupled with the piston connection shaft of the reciprocating compressor such as a pump, as well as the compressor shown in FIGS. 1 and 2, thereby readily enabling top clearance adjustment.
[74]
Industrial Applicability
[75] As can be seen from the foregoing, it is possible to readily and precisely adjust a top clearance between a piston and a valve of a reciprocating compressor.
[76] In addition, since the top clearance can be precisely adjusted, a dead volume caused by the top clearance can be minimized depending on characteristics of the valve and the piston.
[77] Further, it is possible to mount a conveyance nut on a thrust bearing to support axial load.
[78] While this invention has been described with reference to exemplary embodiments thereof, it will be clear to those of ordinary skill in the art to which the invention pertains that various modifications may be made to the described embodiments without departing from the spirit and scope of the invention as defined in the appended claims and their equivalents.
Claims
[1] An apparatus for adjusting a top clearance of a reciprocating compressor comprising: a housing, a cylinder block having a plurality of cylinder bores, pistons reciprocally accommodated in the cylinder bores, a piston drive means for driving the pistons, piston connection shafts connected to the pistons, suction/ discharge valves installed opposite to bottoms of the pistons, and a suction chamber and a discharge chamber formed in the housing through the medium of the suction/discharge valves, characterized in that each of the piston connection shafts has a conveyance nut threadedly engaged therearound.
[2] The apparatus according to claim 1, wherein, when seen in an axial direction of the piston connection shaft, the conveyance nut has a fixing groove having a plurality of prominences and depressions formed at a center of the conveyance nut in a circumferential direction, a fixing washer having prominences and depressions formed therearound is installed in the fixing groove, and the fixing washer passes through the piston connection shaft.
[3] The apparatus according to claim 2, wherein the fixing washer is formed of a resilient thin plate, and is resiliently inserted into the fixing groove of the conveyance nut.
[4] The apparatus according to claim 2, wherein the fixing washer is fastened to the piston connection shaft in a rotational direction.
[5] The apparatus according to claim 4, wherein the piston connection shaft and the fixing washer coupled with the piston connection shaft are formed in a polygonal shape having round corners or an oval shape.
[6] The apparatus according to claim 3, wherein the fixing groove of the conveyance nut, with which the fixing washer is coupled, has a step formed therearound.
[7] The apparatus according to claim 1, wherein a thrust bearing is installed in the front or rear of the conveyance nut.
[8] The apparatus according to any one of claims 1 to 7, wherein the piston connection shaft is a drive shaft rotatably supported by the cylinder block, a swash plate is installed at the drive shaft to simultaneously rotate with the drive shaft and vary the inclination thereof, and the piston is reciprocally accommodated in the cylinder bore and is slidable back and forth with respect to the swash plate.
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP06824169.4A EP2102501B1 (en) | 2006-12-14 | 2006-12-14 | Apparatus for adjusting top clearance of reciprocating compressor |
KR1020097012417A KR101089859B1 (en) | 2006-12-14 | 2006-12-14 | Apparatus for adjusting top clearance of reciprocating compressor |
PCT/KR2006/005467 WO2008072809A1 (en) | 2006-12-14 | 2006-12-14 | Apparatus for adjusting top clearance of reciprocating compressor |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/KR2006/005467 WO2008072809A1 (en) | 2006-12-14 | 2006-12-14 | Apparatus for adjusting top clearance of reciprocating compressor |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2008072809A1 true WO2008072809A1 (en) | 2008-06-19 |
Family
ID=39511806
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/KR2006/005467 WO2008072809A1 (en) | 2006-12-14 | 2006-12-14 | Apparatus for adjusting top clearance of reciprocating compressor |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP2102501B1 (en) |
KR (1) | KR101089859B1 (en) |
WO (1) | WO2008072809A1 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR102240115B1 (en) * | 2015-01-27 | 2021-04-15 | 학교법인 두원학원 | Reciprocating Compressor |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR910001181B1 (en) * | 1984-02-21 | 1991-02-25 | 산덴 가부시끼가이샤 | Slant plate type compressor |
EP0334634B1 (en) * | 1988-03-23 | 1991-10-02 | Sanden Corporation | Slant plate type compressor |
KR19990045647A (en) * | 1997-11-28 | 1999-06-25 | 요코야마 다카요시 | Control Valves for Variable Capacity Compressors |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS60135680A (en) * | 1983-12-23 | 1985-07-19 | Sanden Corp | Oscillation type compressor |
JPH0830464B2 (en) * | 1988-06-23 | 1996-03-27 | 株式会社豊田自動織機製作所 | Oscillating plate type variable displacement compressor |
KR910004933A (en) * | 1989-08-09 | 1991-03-29 | 미다 가쓰시게 | Variable displacement swash plate compressor |
JP2001012345A (en) * | 1999-06-28 | 2001-01-16 | Sanden Corp | Variable displacement compressor |
-
2006
- 2006-12-14 KR KR1020097012417A patent/KR101089859B1/en active IP Right Grant
- 2006-12-14 EP EP06824169.4A patent/EP2102501B1/en not_active Not-in-force
- 2006-12-14 WO PCT/KR2006/005467 patent/WO2008072809A1/en active Application Filing
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR910001181B1 (en) * | 1984-02-21 | 1991-02-25 | 산덴 가부시끼가이샤 | Slant plate type compressor |
EP0334634B1 (en) * | 1988-03-23 | 1991-10-02 | Sanden Corporation | Slant plate type compressor |
KR19990045647A (en) * | 1997-11-28 | 1999-06-25 | 요코야마 다카요시 | Control Valves for Variable Capacity Compressors |
Non-Patent Citations (1)
Title |
---|
See also references of EP2102501A4 * |
Also Published As
Publication number | Publication date |
---|---|
KR101089859B1 (en) | 2011-12-05 |
KR20100004916A (en) | 2010-01-13 |
EP2102501A4 (en) | 2012-07-25 |
EP2102501A1 (en) | 2009-09-23 |
EP2102501B1 (en) | 2013-07-03 |
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