EP0844393A1 - Variable-displacement swash plate compressor - Google Patents
Variable-displacement swash plate compressor Download PDFInfo
- Publication number
- EP0844393A1 EP0844393A1 EP97120476A EP97120476A EP0844393A1 EP 0844393 A1 EP0844393 A1 EP 0844393A1 EP 97120476 A EP97120476 A EP 97120476A EP 97120476 A EP97120476 A EP 97120476A EP 0844393 A1 EP0844393 A1 EP 0844393A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- chamber
- communication path
- crank chamber
- swash plate
- cylinder block
- 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.)
- Granted
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
- F04B27/14—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
-
- 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
- F04B2027/1886—Open (not controlling) fluid passage
- F04B2027/189—Open (not controlling) fluid passage between crankcase and discharge chamber
Definitions
- the present invention relates to an arrangement that introduces compressed fluid from a discharge chamber to a crank chamber in a variable-displacement swash plate compressor designed to change the inclination angle of the swash plate by controlling the pressure in the crank chamber.
- JP-B Japanese Patent Publication (JP-B) No. 32479/1990 discloses an arrangement that introduces compressed fluid from a discharge chamber to a crank chamber in a conventional variable-displacement swash plate compressor.
- variable-displacement swash plate compressor disclosed is outlined below.
- a compressor housing 1 with a cylindrical casing 11, one end of which is closed by a front end plate 12, defines a crank chamber 2 and has a cylinder block 3 inside.
- a cylinder head 14 is installed through a valve plate 13 on the cylinder block 3 to define a suction chamber 15 and a discharge chamber 16 between the cylinder head 14 and the valve plate 13.
- a pin 51 secures a rotor 5 to the main rotating shaft 4, extending through the crank chamber 2.
- a bracket 53 with a pin 52 is formed on the rotor 5, and the pin 52 is slidably fit into a slot 62, formed in an arm 61 extending from a swash plate 6.
- Pivots 71 of piston rods 33, described later, and a pin 72, fitting into the rotation prevention mechanism 64, are provided at the external edge of the wobble plate 7.
- a plurality of cylinder bores 31 and a communication path 9, all of which are substantially parallel with the main rotating shaft 4, and a displacement control mechanism 8 are formed in the cylinder block 3.
- Pistons 32 are disposed in the cylinder bores 31, each of the pistons being connected through a piston rod 33 to the wobble plate 7.
- the wobble plate 7 only wobbles because the rotation prevention mechanism 64 prevents the wobble plate's rotation. Wobbling motion of the wobble plate 7 causes the pistons 32 to slide back and forth in the cylinder bores 31 by the aid of the piston rods 33.
- the displacement control mechanism 8 has a valve 81 and a bellows 82, both of which are disposed inside a casing 83 in a chamber 36, provided next to the bearing unit for the main rotating shaft 4 in the cylinder block 3.
- the casing 83 is provided with communication holes 84 and 85.
- the communication hole 84 communicates with the crank chamber 2, and the communication hole 85 communicates via a path 86 with the suction chamber 15.
- crank chamber 2 and suction chamber 15 are made communicate with each other using the displacement control mechanism 8 to reduce the pressure in the crank chamber so that the compressor operates at its maximum compression displacement. If the pressure in the crank chamber is below the predetermined value, the communication of the crank chamber 2 with the suction chamber 15 is shut off, thus causing the inclination angle of the swash plate 6 to vary with the pressure in the crank chamber 2, so that the compression displacement changes.
- the communication path 9 is formed in the cylinder block 3, the valve plate 13, and a valve retainer 39, which path connects the crank chamber 2 with the discharge chamber 16 so that the two chambers communicate with each other, and a capillary tube 91 is inserted into the communication path 9.
- a filter 92 is attached to the discharge chamber 16 side end of the capillary tube 91.
- the inner diameter and length of the capillary tube 91 can be adjusted to set the pressure and rate of flow from the discharge chamber 16 into the crank chamber 2 for appropriate values.
- crank chamber and the discharge chamber of the conventional variable-displacement swash plate compressor are arranged to communicate with each other, the communication path is formed between one of the cylinder bores and the other cylinder bores in the cylinder block.
- the thickness of a wall around the communication path is insufficient to provide a seal between a high pressure side (the discharge chamber) and a low pressure side (the suction chamber), causing a deterioration in compression performance or controllability. Insufficient wall thickness also causes a cylinder bore to deform.
- the present invention provides a variable-displacement swash plate compressor that is arranged to introduce compressed fluid into a crank chamber through a communication path formed between a silencer chamber or a discharge hole and cylinder bores in a cylinder block.
- the communication path makes a discharge chamber in a cylinder head and the crank chamber in the cylinder block communicate with each other, and through an orifice allowing a predetermined amount of compressed fluid to flow toward the crank chamber side of the communication path.
- Fig. 1 is a cross-sectional view of a conventional variable-displacement swash plate compressor.
- Fig. 2 is a front view of part of a cylinder block of a conventional variable-displacement swash plate compressor.
- Fig. 3 is a cross-sectional view of an embodiment of the present invention.
- Fig. 4 is a front view of main part of a cylinder block of an embodiment of the present invention.
- a compressor housing 1 with a cylindrical casing 11, one end of which is closed by a front end plate 12, defines a crank chamber 2 and has a cylinder block 3 inside.
- a cylinder head 14 is installed on the cylinder block 3 through a valve plate 13 to define a suction chamber 15 and a discharge chamber 16 between the cylinder head 14 and the valve plate 13.
- a rotor 5 is secured to the main rotating shaft 4, extending trough the crank chamber 2.
- a bracket 53 with a pin 52 is formed on the rotor 5, and the pin 52 is slidably fit into a slot 62, formed in an arm 61 extending from a swash plate 6.
- a plurality of cylinder bores 31 and a communication path 9, all of which are substantially parallel with the main rotating shaft 4, and a displacement control mechanism 8 are formed in the cylinder block 3.
- Pistons 32 are disposed in the cylinder bores 31.
- the displacement control mechanism 8 of the embodiment is the case with a conventional variable-displacement swash plate compressor.
- a silencer chamber 43 which is of expansion form and has muffler function, is installed on the cylinder block 3.
- the silencer chamber 43 attenuates pulsation of compressed fluid discharged which flows from the discharge chamber 16 to the silencer chamber 43 through a communication path 10 and the communication path 9.
- the silencer chamber 43 is provided with a discharge hole 44 to allow compressed fluid to flow into a refrigerating circuit.
- the communication path 9 and the communication path 10, making the crank chamber 2 communicate with the discharge chamber 16 of the cylinder head 14, are installed in the cylinder block 3, the valve plate 13, and the cylinder head 14.
- the communication path 9 is installed between the silencer chamber 43 and the cylinder bores 31.
- a pipe-shaped orifice 45 is inserted into the communication path 9 on the crank chamber 2 side.
- the orifice 45 can also be directly formed in the cylinder block 45.
- a filter 46 is installed on the discharge chamber 16 side of the orifice 45 to remove dirt from compressed fluid.
- the orifice 45 allows a predetermined amount of compressed fluid to flow from the discharge chamber 16 to the crank chamber 2.
- the flow rate is adjusted by choosing one among a plurality of orifices having different hole diameters or lengths.
- the embodiment of the present invention is a variable-displacement swash plate compressor having no wobble plate, but the present invention can of course apply to a variable-displacement swash plate compressor with a wobble plate.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Compressors, Vaccum Pumps And Other Relevant Systems (AREA)
Abstract
Description
Claims (4)
- A variable-displacement swash plate compressor that is adapted to introduce compressed fluid into a crank chamber through a communication path formed between a silencer chamber and cylinder bores in a cylinder block, said communication path making a discharge chamber in a cylinder head and said crank chamber in said cylinder block communicate with each other, and through an orifice installed which allows a predetermined amount of compressed fluid to flow toward said crank chamber side of said communication path.
- A variable-displacement swash plate compressor as claimed in claim 1, wherein said orifice is arranged by inserting a pipe into said communication path.
- A variable-displacement swash plate compressor as claimed in claim 1 or 2, wherein a filter is installed in front of said orifice.
- A variable-displacement swash plate compressor that is adapted to introduce compressed fluid into a crank chamber through a communication path formed between a discharge hole and cylinder bores in a cylinder block, said communication path making a discharge chamber in a cylinder head and said crank chamber in said cylinder block communicate with each other, and through an orifice installed which allows a predetermined amount of compressed fluid to flow toward said crank chamber side of said communication path.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP8313612A JPH10153172A (en) | 1996-11-25 | 1996-11-25 | Swash plate variable capacity compressor |
JP313612/96 | 1996-11-25 | ||
JP31361296 | 1996-11-25 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0844393A1 true EP0844393A1 (en) | 1998-05-27 |
EP0844393B1 EP0844393B1 (en) | 2001-02-28 |
Family
ID=18043422
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19970120476 Expired - Lifetime EP0844393B1 (en) | 1996-11-25 | 1997-11-21 | Variable-displacement swash plate compressor |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0844393B1 (en) |
JP (1) | JPH10153172A (en) |
DE (1) | DE69704149T2 (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR100537922B1 (en) * | 1998-10-16 | 2006-03-14 | 한라공조주식회사 | Muffler of swash plate compressor |
KR102013595B1 (en) * | 2014-03-03 | 2019-08-23 | 한온시스템 주식회사 | A Variable displacement swash plate type compressor and method for controlling thereof |
KR102015317B1 (en) * | 2014-03-03 | 2019-08-28 | 한온시스템 주식회사 | A Variable displacement swash plate type compressor |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3633489A1 (en) * | 1985-10-02 | 1987-05-14 | Toyoda Automatic Loom Works | SWASH DISC COMPRESSOR |
US4752189A (en) * | 1986-12-09 | 1988-06-21 | Diesel Kiki Co., Ltd. | Valve arrangement for a variable displacement compressor |
EP0318976A1 (en) * | 1987-11-30 | 1989-06-07 | Sanden Corporation | Slant plate type compressor with variable displacement mechanism |
US5518374A (en) * | 1994-07-29 | 1996-05-21 | Kabushiki Kaisha Toyoda Jidoshokki Seisakusho | Variable capacity swash plate type compressor having pulsation suppressing chamber located capacity control valve |
-
1996
- 1996-11-25 JP JP8313612A patent/JPH10153172A/en not_active Withdrawn
-
1997
- 1997-11-21 EP EP19970120476 patent/EP0844393B1/en not_active Expired - Lifetime
- 1997-11-21 DE DE1997604149 patent/DE69704149T2/en not_active Expired - Lifetime
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3633489A1 (en) * | 1985-10-02 | 1987-05-14 | Toyoda Automatic Loom Works | SWASH DISC COMPRESSOR |
US4752189A (en) * | 1986-12-09 | 1988-06-21 | Diesel Kiki Co., Ltd. | Valve arrangement for a variable displacement compressor |
EP0318976A1 (en) * | 1987-11-30 | 1989-06-07 | Sanden Corporation | Slant plate type compressor with variable displacement mechanism |
US5518374A (en) * | 1994-07-29 | 1996-05-21 | Kabushiki Kaisha Toyoda Jidoshokki Seisakusho | Variable capacity swash plate type compressor having pulsation suppressing chamber located capacity control valve |
Also Published As
Publication number | Publication date |
---|---|
DE69704149D1 (en) | 2001-04-05 |
DE69704149T2 (en) | 2001-08-02 |
JPH10153172A (en) | 1998-06-09 |
EP0844393B1 (en) | 2001-02-28 |
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